JP4647229B2 - Liquid material discharge device - Google Patents

Description

  The present invention relates to a technical field in which a liquid material is ejected by dropping or flying, and relates to a technique for quantitatively ejecting the liquid material.

  As shown in Patent Documents 1 and 2, as a technique for splashing liquid material, a plunger that performs advancing and retreating operation is used, and a plunger that rapidly moves forward is brought into contact with a valve seat to rapidly stop the plunger. A technique is known in which an inertial force is applied to the liquid material located in front of the liquid, and the liquid material is ejected by this inertial force. In this technique, the inertial force necessary to cause the liquid material to fly, Because the plunger that moves is brought into contact with the valve seat that is stopped and the movement of the plunger stops instantaneously, the plunger and the valve seat are severely damaged. There was a problem of mixing and dissolving.

  Therefore, in order to solve the above problem, the applicant of the present invention is to move the plunger forward at high speed and then stop the plunger driving means suddenly after bringing the tip surface of the plunger for discharging the liquid material into close contact with the liquid agent. , We propose a technique to stop the plunger rapidly moving without abutting against the valve seat, apply an inertial force to the liquid material located in front of the plunger, and drop the liquid material by this inertial force. Furthermore, as a specific device for implementing this, a tube-shaped measuring unit, a plunger inscribed in the measuring unit, a nozzle having a discharge port, and a first unit that communicates the measuring unit and the nozzle. It is comprised by the valve | bulb, the storage container which stores a liquid agent, and the 2nd valve which connects the said storage container and the said measurement part, and it provides in the internal diameter of the said measurement part, and the valve body of the said 1st valve | bulb Through hole is actually Proposed an apparatus for the same diameter (Patent Document 3).

JP 2002-282740 A JP 2001-287798 A Japanese Patent Laid-Open No. 2003-190871

Although the invention of the prior application has achieved the intended purpose, the following improvements have been found by seeking further discharge stability and maintainability.
That is, when changing the discharge liquid material, the portion where the liquid material of the discharge device comes into contact with the liquid is washed. In particular, the characteristic of the prior application is “the inner diameter of the measuring portion and the valve body of the first valve. If the rotary valve disclosed in the embodiment of the prior application is used so that the through hole to be provided is substantially the same diameter, the valve body is caused to rotate and slide with respect to the valve seat. The liquid material has entered a slight gap between the valve body and the valve seat, and in order to perform sufficient cleaning, dismantling and cleaning are required.

In addition, the gap is configured to be provided with a specified amount between the valve body and the valve seat in order to facilitate sliding of the valve body, and the liquid material filled in the gap has a sharp pressure rise. In the desired discharge system, an unnecessary liquid material occupation space is widened, which requires very laborious work such as disassembly and cleaning. In addition, the liquid material that enters the gap cannot be controlled, and this becomes a factor that hinders the stability of the discharge amount.

  Therefore, the present invention can obtain an appropriate liquid material droplet flow velocity, effectively eliminate unnecessary liquid material occupation space, obtain a steep pressure rise, and obtain an appropriate droplet pressure. An object of the present invention is to provide a liquid material discharge device capable of performing stable discharge. It is another object of the present invention to provide a liquid material ejection device that facilitates cleaning operations and can eject clean liquid material.

  According to the present invention, the liquid material is sucked into the measuring hole by the backward movement of the discharge portion having the discharge port for discharging the liquid and the plunger sliding in close contact with the inner wall surface of the measuring hole of the measuring portion, and the plunger advances. The metering unit that discharges the liquid material from the discharge unit by movement, the first position that communicates the liquid material storage unit and the metering unit, and the second position that communicates the discharge port are switched, and the discharge In a liquid material discharge device comprising a portion and a valve that slides in close contact with the metering portion, the liquid material discharge device is characterized in that the metering portion is disposed at the tip of the liquid material storage portion It is.

  The metering unit is arranged to be connected to or integrally formed with the tip of the liquid material storage unit, and in this case, the present invention provides a discharge unit having a discharge port for discharging a liquid A metering unit that sucks the liquid material into the metering hole by a backward movement of the plunger that slides in close contact with the inner wall surface of the metering hole of the metering unit, and discharges the liquid material from the discharge unit by the advancement movement of the plunger; A valve that switches between a first position that communicates the liquid material storage unit and the metering unit and a second position that communicates the discharge port, and that slides in close contact with the discharge unit and the metering unit In the liquid material discharge device, the liquid material discharge device is characterized in that the measuring portion is connected to or formed integrally with a tip portion of the liquid material storage portion.

  The valve is characterized in that a motor is used as a drive source. In this case, the present invention is a plan in which the discharge portion having a discharge port for discharging the liquid and the inner wall surface of the measurement hole of the measurement portion are in close contact with each other. A first position where the liquid material is sucked into the measurement hole by the backward movement of the jar and the liquid material is discharged from the discharge portion by the advancement movement of the plunger, and the liquid material storage portion and the measurement portion are in communication with each other; In a liquid material discharge apparatus comprising: a second position that communicates with a discharge port; and a valve that slides in close contact with the discharge portion and the measurement portion. The liquid material discharge device is characterized in that it is disposed at the tip of the part, specifically connected or integrally formed, and the valve is driven by a motor. .

  The metering hole is one of at least two holes drilled in the inner wall surface of the metering unit. Preferably, the metering hole is a tube extending from the inner bottom surface of the metering unit to the storage unit side. In this case, the present invention is characterized in that the liquid is obtained by retreating a discharge portion having a discharge port for discharging the liquid and a plunger that slides in close contact with the inner wall surface of the measurement hole of the measurement portion. The material is sucked into the measurement hole, and the measurement unit that discharges the liquid material from the discharge unit by the advance movement of the plunger, the first position that connects the liquid material storage unit and the measurement unit, and the discharge port are connected. In a liquid material discharge device that switches between the second position and includes a valve that slides in close contact with the discharge unit and the measurement unit, the measurement unit is arranged at the tip of the liquid material storage unit. Installation, specifically connected or integrally formed And the measurement hole is one of at least two holes formed in the inner wall surface of the measurement unit. Preferably, the measurement hole is formed from the inner bottom surface of the measurement unit. The liquid material discharge device is characterized in that a tube extending toward the storage portion is formed, and the valve is driven by a motor as necessary.

As described above, the present invention has a structure in which there is no gap between the valve body and the valve seat and the valve portion slides in close contact with the discharge portion and the metering portion. Therefore, a steep pressure rise can be obtained, and an appropriate flying drop pressure can be obtained. The structure of the metering unit is advantageous in that the liquid material can flow from the storage unit to the metering unit and is repeatedly ejected at high speed.
In addition, since the flow path from the measuring section to the discharge port is always the same diameter or a small diameter toward the discharge port, an appropriate droplet flow velocity of the liquid material can be obtained.
Furthermore, the structure that slides in close contact eliminates the liquid material that enters the gap, which is a factor that hinders the stability of the discharge amount, so that extremely stable discharge can be performed and a constant discharge amount can be obtained. Can do.
In addition, since only the valve part can be configured to be detachable from the discharge device, the valve part can be easily removed and the valve part can be of a simple structure, facilitating the cleaning work and reducing the cleaning work time. Not only can it be shortened, but there is no unwashed residue, so even if the type of liquid material is changed, clean liquid material can be ejected without contamination.
Since the motor is used to drive the valve, it becomes easy to synchronize with the operation of the plunger, and the liquid material can be continuously discharged at a high speed.

  Liquid material is sucked into the metering section by the reciprocating movement of the plunger that slides in close contact with the inner wall surface of the metering section, and the liquid material is ejected by the advancement movement of the plunger. The metering unit that discharges from the unit, the first position that communicates the liquid material storage unit and the metering unit, and the second position that communicates the ejection port, and are in close contact with the ejection unit and the metering unit In the liquid material discharge device comprising the sliding valve, the discharge portion has a small diameter and the liquid material storage portion has a large diameter, and the discharge portion is concentric with the tip of the liquid material storage portion. In addition, they are connected or integrally formed.

<Overall structure>
As shown in FIG. 1, the liquid material discharge device of the present invention comprises a machine frame composed of a base 1, a plate (top plate) 3, an intermediate plate 4 and a column plate 2 that connect them in parallel. A valve portion disposed on the base 1, a liquid material supply portion which is disposed between the base 1 and the intermediate plate 4 and is integrally formed with the liquid material storage portion 11 and the measuring portion 12, and a top plate 3 and the intermediate plate 4, and a plunger driving unit using a screw conduction device, and a discharge unit disposed in a nozzle base 25 disposed below the base 1.
Hereinafter, the configuration of each unit will be described in detail.

《Liquid material supply unit》
For example, as shown in FIG. 2, the liquid material supply part is formed with a large diameter part fitted into a holding hole provided in the intermediate plate 4, and the lower part formed with a small diameter fitted into a holding hole provided in the base 1. A container-shaped liquid material reservoir 11, a measuring hole 18 formed integrally with the lower end of the liquid material reservoir 11, and provided with a through hole 19 provided in parallel with the measuring hole 18; The plunger 13 is configured to move forward and backward in close proximity within the measuring unit 12, the plunger driving motor 14 that drives the plunger 13, and a conduction mechanism that transmits the power of the plunger driving motor 14 to the plunger 13. ing.

<Valve part>
For example, as shown in FIG. 2, the valve holding portion is slidable along the measuring portion 12 by a hole formed in the center, and a plurality of mounting holes are provided symmetrically with respect to the insertion portion of the measuring portion 12. A shaft base 22, a shaft 24 that is fixed to the mounting hole of the shaft base 22, extends downward through the bush 21 disposed in the base 1, and a nozzle base 25 that is fixed to the lower protruding end of the shaft 24; A bush 21, a shaft base 22, and a spring 23 surrounding the shaft 24 are configured.

  Since the shaft base 22 and the nozzle base 25 are integrally assembled by the shaft 24 and are urged upward (in a direction in which the nozzle base 25 contacts the liquid material storage unit 11) by the spring 23, the urging force of the spring 23 is In contrast, when the assembly of the shaft base 22, nozzle base 25, and shaft 24 is moved downward along the bush 21, a gap is formed between the liquid material reservoir 11 and the nozzle base 25. The valve 26 can be attached to and detached from the valve holder 27 by using it.

For example, as shown in FIGS. 2 and 3, the valve 26 has an upper surface as a contact surface in close contact with the lower surface of the liquid material storage unit 11, and a lower surface as a contact surface in close contact with the upper surface of the nozzle base 25. A recess 42 that allows the storage container to communicate with the storage container 12 through the through-hole (liquid material supply port) 19 and a through-hole 41 (for the valve) that allows the metering part 12 and the nozzle 31 to communicate with each other at the second position are provided. ing.
Further, the valve holder 27 that is in close contact with the side wall of the valve 26 is positioned in the horizontal direction, and moves in conjunction with the forward / backward movement of the valve 26 by the valve drive motor 28. At this time, the valve 26 slides in close contact with each of the nozzle base 25 and the liquid material storage portion 11, and the action of the spring 23 causes the liquid material to pass through the through hole 41 and the recess 42 provided in the valve 26. The flow path is sealed so that there is no leakage.
In the illustrated example, the outer shape of the valve 26 is formed in a square shape, but it may be formed in a circular shape as long as the positional relationship between the through hole 41 and the concave portion 42 is the same.

《Discharge unit》
The discharge part is composed of a nozzle 31 attached to the lower surface of the nozzle base 25, has a discharge port 32 at the tip, and the flow path from the metering unit 12 to the discharge port 32 at the tip of the nozzle 31 has an inner diameter of the metering unit 12. The maximum diameter is set, and the inner diameter of the discharge port 32 is set as the minimum diameter, and the flow path between the measuring unit and the discharge port is configured such that the discharge port side always has a small diameter or the same diameter.
In the above example, the nozzle 31 extending from the nozzle base 25 is used. However, a hole having a diameter suitable for the dropping amount may be formed in the nozzle base 25 to discharge the liquid material.
Further, the distance between the discharge port 32 of the nozzle 31 and the valve 26 is as small as possible, so that the volume of the liquid material to be pressurized when the plunger 13 described later is advanced can be minimized, and the steep necessary for flying droplets can be obtained. This is preferable because a pressure increase can be obtained.

《Liquid material discharge work》
A liquid material discharge operation using the liquid material discharge apparatus having the above configuration will be described.
In a state in which no liquid material is introduced into the measuring unit, the valve 26 is moved backward by the valve driving motor 28 to bring the valve 26 into the first position where the through hole 19 and the measuring unit 12 communicate with each other. The jar driving motor 14 is actuated to move the plunger 13 backward, so that the metering hole 18 is filled from the liquid material reservoir 11 through the through hole 19 and the concave portion 42 of the valve 26.
Thereafter, the plunger 13 is moved forward to bring the tip into close contact with the liquid material, and the bubbles in the measuring section are eliminated. In addition, you may perform such bubble removal using the plunger provided with the bubble removal mechanism which the applicant has already applied for in Unexamined-Japanese-Patent No. 2003-190871, for example.

Thereafter, the valve 26 is advanced and moved by the valve drive motor 28 to bring the valve 26 into the second position where the measuring portion 12 and the discharge port 32 communicate with each other, and the plunger drive motor 14 is operated at high speed to define the plunger 13. The liquid material stored in the measuring unit 12 is ejected from the discharge port 32 at the tip of the nozzle 31 by moving forward at a high speed.
Since the flow path from the measurement unit 12 to the discharge port 32 always has a small diameter toward the discharge port 32, the flow rate of the liquid material from the measurement unit 12 to the discharge port 32 is changed from the measurement unit 12 to the discharge port 32. The speed of the liquid material becomes higher, and the flow rate of the liquid material sufficient for flying droplets can be obtained at the discharge port 32 at the tip of the nozzle 31.
In this way, all the liquid material sucked into the measuring unit is discharged from the measuring unit.

  As described above, in the repetition of the discharge operation, the distal end position of the plunger 13 is always moved backward from the fixed position and moved forward from the fixed position so that the operation of the plunger 13 becomes uniform for each discharge.

  FIG. 4 shows a main part of the liquid material discharge device of the present embodiment. In this embodiment, the configuration of the valve section and the discharge section is the same as that of the first embodiment, but the measuring section in the liquid material supply section is stored. By forming the cylindrical part 16 by extending the inside of the part, the thickness of the lower part of the liquid material storing part 11 can be reduced, and the flow path leading from the storing part of the liquid feeding path to the measuring part 12 is shortened. It is possible to reduce the flow path resistance and promptly guide the liquid material to the measuring unit 12, and this enables the discharge to be repeated quickly (high-speed continuous discharge).

  FIG. 5 shows an essential part of the liquid material ejection device of the present embodiment, which is a further improvement of the second embodiment and is in close contact with the inner peripheral surface of the measuring section 12 as shown in FIG. By attaching the guide 17 to the fixed position of the plunger 13, it is easy to insert the plunger 13 into the measuring unit 12 at the time of setting up the apparatus, and further, the tip of the plunger 13 enters the liquid feeding path. To prevent.

  When the distal end surface of the plunger 13 is located on the surface where the valve and the measuring portion distal end surface are in sliding contact with each other, the lower end surface of the guide 17 is in contact with the distal end surface extending into the storage portion. By adjusting the mounting position, all of the liquid material sucked into the measuring unit 12 can be discharged from the measuring unit 12, so that the liquid material to be pressurized for ejection, dripping and flying droplets can be reduced to the minimum necessary amount. , Enabling the discharge to be repeated quickly (high-speed continuous discharge).

  FIGS. 7A and 7B show the main part of the liquid material discharge device of the present embodiment. In this embodiment, the liquid material storage section 11 and the measuring section 12 are formed separately, and the liquid material storage is shown. The male screw part screwed on the outer periphery of the measuring part 12 is screwed to the female screw part screwed on the inner circumference of the part 11 to integrate them.

It is an apparatus schematic. FIG. 3 is an enlarged cross-sectional view of a main part of the liquid material ejection device according to the first embodiment. It is a schematic perspective view of a valve. FIG. 6 is a cross-sectional view of a main part of a liquid material ejection device according to a second embodiment. FIG. 6 is a cross-sectional view of a main part of a liquid material ejection device according to a third embodiment. It is a top view of the guide of Example 3. FIG. 9 is a cross-sectional view of a main part of a liquid material ejection device according to a fourth embodiment. a: 1st position which connects a liquid material storage part and a measurement part, b: 2nd position which connects a liquid material storage part and a discharge port

Explanation of symbols

1 base 2 support plate 3 plate (top plate)
4 Intermediate Plate 11 Liquid Material Storage Unit 12 Metering Unit 13 Plunger 14 Plunger Drive Motor 16 Cylindrical Unit 17 Guide 18 Metering Hole 19 Through Hole (Liquid Material Supply Port)
21 Bush 22 Shaft base 23 Spring 24 Shaft 25 Nozzle base 26 Valve 27 Valve holder 28 Valve drive motor 31 Nozzle 32 Discharge port 41 (Valve) through hole 42 (Valve) recess

Claims (7)

Liquid material is sucked into the metering hole by a discharge part having a discharge port for discharging liquid, a liquid material storage part through which the plunger penetrates, and a plunger that slides in close contact with the inner wall surface of the metering hole. , A measuring unit that discharges the liquid material from the discharge unit by advancing movement of the plunger, a first position that communicates the liquid material storage unit and the measuring unit, and a second position that communicates the measuring unit and the discharge port , And a valve portion that slides in close contact with the discharge portion and the metering portion, and a liquid material discharge device that discharges the liquid material by dropping or flying,
An apparatus for discharging a liquid material, wherein when the plunger moves forward, the valve portion is set to a second position to form a linear flow path that connects the discharge port and the measurement hole. 2. The liquid material ejection device according to claim 1, wherein the metering unit is arranged so as to be connected to or integrally formed with a tip portion of the liquid material storage unit. The base mechanism metering unit is arranged, is provided below the base mechanism, a nozzle base mechanism the discharge portion is arranged, the shaft (24) which lower end portion is fixed to the nozzle base mechanism, the shaft An urging means for urging the nozzle base mechanism upward via (24) ,
The valve unit includes a valve (26) that is detachably attached and slidably in a state of being slidable between the nozzle base mechanism biased upward and the measuring unit ,
The valve (26) has a through-hole that penetrates the upper surface and the lower surface thereof and communicates the measurement hole and the discharge port, and a flow path that communicates the liquid material reservoir and the measurement hole. The liquid material discharge device according to claim 2 . Two through holes bored in the inner part bottom surface of the liquid material reservoir provided, according to claim 1 in which one through-hole and measuring holes, characterized in that the other one through-hole and the liquid material supply port or ejection device of the liquid material according to claim 3. Said metering hole, the discharge system for a liquid material according to claim 4, wherein Rukoto formed to include a is extended to the reservoir side tube from the interior bottom surface of the metering section. 6. The liquid material ejection device according to claim 5 , wherein the plunger has a guide that abuts the tube and defines a position where the plunger is advanced . The liquid material discharge device according to claim 1, wherein the linear flow path is configured so that a discharge port side has a small diameter .

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