JP2009006233A - Nozzle device for discharging liquid and coating apparatus equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nozzle device (50) for discharging a liquid which is capable of surely preventing the sagging of a liquid. <P>SOLUTION: The nozzle device for discharging a liquid is characterized by being provided with a sleeve (ST) equipped with a nozzle part (2) having a discharging port (2g), a rotor part (R) inserted therethrough, a spiral brim (Ra) formed thereto and by having a constitution that the brim conveys the liquid (A1) supplied into the sleeve to the nozzle part side by the rotation of a first direction (RTL) of the rotor part and that screw parts (3c, Rb) to be screwed on by the rotation of a second direction (RTR) reverse to the first direction are formed on the sleeve and the rotor part, and an isolation valve part (R1a) to close the discharging port is installed at the distal end of the nozzle part side in the rotor part so as to close the discharging port with the isolation valve part by screwing the screw each other to transfer the rotor part to the nozzle part side when the rotor part is rotated in the second direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid discharge nozzle device and a liquid application device including the same, and more particularly to a technique for effectively preventing dripping of application liquid when not in use.

In a liquid discharge nozzle device for discharging a liquid and a liquid application device that includes the same and applies a liquid to an object, the liquid is not limited to a single type, and a plurality of types of liquid are stirred and mixed by a mixer. There are also known nozzles for discharging the liquid and devices for applying the mixed liquid to the member to be applied using the nozzles.
As an example of the liquid, there is an adhesive, and in particular, as a plurality of types of liquid, there is a two-component curing type adhesive using an epoxy system or the like.

  Patent Document 1 describes an example of such a device. The device is roughly provided with a rotor provided with an agitating portion and an extruding portion in an outer cylinder, and is rotated by rotating the rotor. A liquid mixing / discharging device configured to mix and discharge two liquids introduced into a cylinder.

JP-A-7-88416

By the way, not only when discharging one kind of liquid but also when mixing and discharging liquid, the lower the viscosity of the liquid to be mixed and the better the fluidity, the better the mixing or discharging can be performed with less resistance.
Therefore, if the liquid used has a high viscosity and the fluidity is not good, for example, a heating device such as a heater is used to raise the temperature of the part that contributes to mixing and ejection, thereby intentionally improving the fluidity of the liquid. Is also done.

However, when the viscosity of the liquid is lowered to improve dischargeability and agitation, the liquid to be applied leaks from the discharge port at the tip of the nozzle and drips when not in use, such as when the apparatus is stopped. It tends to occur.
This dripping may cause a problem that extra liquid adheres to the object to be applied and contaminates the object, or attaches to equipment such as a coating device or a jig around the application device and contaminates them. In the first place, there is a problem that the liquid itself is wasted.

  For this reason, various ideas for preventing the dripping have been proposed. In the liquid mixing and discharging apparatus described in Patent Document 1, as described in paragraph 0026, the rotor is used to stop discharging. A technique for preventing dripping of the nozzle portion by applying a negative pressure to the inside of the nozzle portion by the action of a concave portion provided on the outer peripheral surface of the rotor is disclosed.

However, in the apparatus described in Patent Document 1, even if the pressure in the nozzle portion is negative, since the liquid is accumulated in the space between the tip of the rotor and the discharge port, the liquid is discharged from the discharge port by its own weight. There was a risk of leakage.
About this leakage, the possibility increases as the diameter of the discharge port is larger and the viscosity of the liquid is lower, so liquid leakage is surely prevented without being affected by the diameter of the discharge port and the viscosity of the liquid. Improvement is desired so that it can be done.

  Accordingly, the problem to be solved by the present invention is that a liquid discharge nozzle device and a liquid equipped with the same can reliably prevent liquid dripping regardless of the viscosity of the liquid to be applied and the diameter of the discharge port. It is to provide a coating apparatus.

In order to solve the above problems, the present invention has the following configurations 1) to 3) as means.
1) a sleeve body (ST) to which a nozzle part (2) having a discharge port (2g) formed on one end side is attached;
A rotor portion (R) inserted through the sleeve body (ST);
A spiral collar (Ra) formed on the rotor portion (R),
When the liquid (A1) supplied to the inside of the sleeve body (ST) is rotated in the first direction (RTL) of the rotor portion (R) with respect to the sleeve body (ST), the collar (Ra) becomes the liquid. In the liquid discharge nozzle device that transports (A1) to the nozzle part (2) side and discharges the liquid (A) from the discharge port (2g),
Threaded portions (3c, Rb) that are threadedly engaged with the sleeve body (ST) and the rotor portion (R) by rotation in a second direction (RTR) opposite to the first direction (RTL), respectively. And forming a shutoff valve portion (R1a) for closing the discharge port (2g) at the tip of the rotor portion (R) on the nozzle portion (2) side,
When the rotor portion (R) is rotated in the second direction (RTR), the screw portions (3c, Rb) are screwed together, and the rotor portion (R) is screwed into the nozzle portion by the screwing. (2) The liquid discharge nozzle device (50) is configured to move to the side so that the shut-off valve portion (R1a) closes the discharge port (2g).
2) The shut-off valve portion (R1a) is formed such that its outer surface (R1a1) is a conical side surface or a truncated cone side surface having a vertex on the tip side of the rotor portion (R),
The liquid according to 1), wherein the inner surface (2e1) on the tip side of the nozzle portion (2) is formed as an inclined curved surface corresponding to the outer surface (R1a1) of the shut-off valve portion (R1a1). A discharge nozzle device (50).
3) The liquid discharge nozzle device (50) according to 1) or 2), and the sleeve (ST) of the liquid discharge nozzle device (50) connected to the liquid (A1) inside the sleeve body (ST). A liquid injection tube (7) for injecting liquid, a drive part (M) for rotationally driving the rotor part (R) of the liquid discharge nozzle device (50), and a control for controlling the rotation direction of the drive part (M) And a liquid application device that applies the liquid (A) to the object (TS) by discharging the liquid (A) from the discharge port (2g) of the liquid protruding nozzle device (50). In
The control unit (20) rotates the rotor unit (R) in the first direction (RTL) in the first state in which the driving unit (M) discharges the liquid (A). Control is performed to rotate the rotor portion (R) in the second direction (RTR) during the transition from the first state to the second state where the liquid (A) is not ejected for a predetermined time or longer. This is a liquid application device (51).

  According to the present invention, it is possible to reliably prevent dripping of the liquid regardless of the viscosity of the liquid to be applied and the diameter of the discharge port.

  The preferred embodiments of the present invention will be described with reference to FIGS.

1 (a) and 1 (b) show an embodiment of the liquid discharge nozzle device of the present invention. FIG. 1 (b) shows a rotor R (details will be described later) with respect to FIG. 1 (a). ) Shows a state of being rotated by 90 ° (however, a collar Ra of a mixer unit R3 described later is represented by the same for convenience).
Further, in this embodiment, a liquid discharge nozzle that mixes and discharges a two-component curable adhesive A (hereinafter also simply referred to as an adhesive A) that is cured by mixing the first liquid A1 and the second liquid A2. It is.
As this adhesive A, for example, an epoxy two-component curable adhesive 2088E manufactured by Three Bond Co., Ltd. can be used.
In addition to the adhesives described in the embodiments, the types of liquids that can be used include paints, cleaning agents, and sealing agents.
Moreover, as a viscosity of a liquid, the thing about 0.1-60 Pa * s can be used conveniently.

  First, in FIG. 1A, this liquid discharge nozzle device 50 has a through hole 1a, a circle in which a female screw 1b is formed on one end side of the through hole 1a and a male screw 1c is formed on the other end side. An annular front sleeve 1, a nozzle portion 2 having a through hole 2 a screwed to a female screw 1 b of the front sleeve 1, a sleeve 3 screwed to a male screw 1 c of the sleeve 1 and having a through hole 3 a, and a through of the rear sleeve 3 And a rotor R inserted through the through hole 1a of the front sleeve 1 and the through hole 2a of the nozzle portion 2. The integrated front sleeve 1 and rear sleeve 3 are also referred to as a sleeve body ST.

The front sleeve 1 is provided with agent injection holes 1d and 1e at positions where the through holes 1a and the outside are connected to each other in the radial direction and spaced apart by 180 ° in the circumferential direction. Yes.
In FIG. 1A, the agent injection hole 1e is provided at a position closer to the female screw 1b of the sleeve 1 than the agent injection hole 1d.

The nozzle portion 2 includes a male screw 2b that engages with the female screw 1b of the sleeve 1, a flange portion 2c that contacts the one end surface 1t1 of the sleeve 1 when screwed into the male screw 1b, and a shaft CL at the center of the flange portion 2c. And a cylindrical portion 2d projecting along.
The cylindrical portion 2d is formed with a tapered portion 2e which is tapered on the distal end side, and a discharge port 2g is provided on the distal end surface 2f of the cylindrical portion 2d.
The discharge port 2g is an opening on the distal end side of the through hole 2a, and is formed in a circular shape in the embodiment.

  The rear sleeve 3 is formed with a female screw 3b that is screwed into the male screw 1c of the sleeve 1 on one end side of the through hole 3a, and a female screw 3c as a right screw on the other end side.

  The rotor R can be inserted from the other end side of the rear sleeve 3, and has a conical portion R1a having a pointed conical shape and a diameter connected to the conical portion R1a from the insertion distal end side in FIG. A needle portion R1 composed of a constant diameter portion R1b, and extends from the needle portion R1 along the axis CL to form a double D-cut shape in cross section [see comparison between FIG. 1 (a) and FIG. 1 (b) ] A shaft portion R2, a mixer portion R3 having a flange Ra formed in a clockwise direction toward the needle portion R1, a main shaft portion R4 having a circular cross section, and a diameter larger than that of the main shaft portion R4 on the outer peripheral surface. It has a screw flange portion R5 in which a male screw Rb is formed as a right screw, and a connecting shaft portion R6 extending from the screw flange portion R5 along the axis CL.

The position in the axis CL direction of the rotor R in FIG. 1A is a discharge position for discharging the adhesive A, and this position is the axial direction of the drive unit M connected to the connecting shaft portion via the flexible joint FJ. It is determined by a positioning mechanism (not shown) that determines the position.
At this discharge position, the relationship between the rotor R and each member is set to be as follows.
A predetermined gap S1 is formed between the surface of the conical portion R1a of the needle portion R1 and the inner surface of the through hole 1a of the front sleeve 1.
A gap S2 narrower than the gap S1 is formed between the outer peripheral surface of the constant diameter portion R1b of the needle portion R1 and the inner surface of the through hole 1a of the front sleeve 1.
Further, the inclination angle of the surface R1a1 of the conical portion R1a in the needle portion R1 is set to the same angle as the inclination angle of the inner surface 2e1 of the tapered portion 2e of the nozzle portion 2.
That is, the surface R1a1 and the inner surface 2e1 are formed as surfaces that are in close contact with each other.

  The diameter of the outer peripheral surface (arc) of the shaft portion R2 is set to be the same as that of the constant diameter portion R1b.

The agent injection hole 1d is provided in the through hole 1a so that the opening position thereof corresponds to the main shaft portion R4 side of the mixer portion R3.
The agent injection hole 1e is provided in the through hole 1a so that the opening position thereof corresponds to the vicinity of the central part of the mixer part R3.

  The outer diameter of the main shaft portion R4 is formed so as to have a minute gap that allows the main shaft portion R4 to rotate with respect to the inner diameter of the front sleeve 1 on the side where the male screw 1c is provided.

  A predetermined gap is provided between the outer peripheral surface of the main shaft portion R4 and the inner peripheral surface of the rear sleeve 1, and a pair of seal rings 4 formed of rubber or the like with the ring spacer 6 interposed therebetween. Is biased in the direction of the axis CL by a biasing member 5 such as a spring. Thereby, the effect of sealing the adhesive A is exhibited.

That is, the rubber ring 4 is compressed and deformed by the urging force of the urging member 5 so that the inner peripheral surface presses the outer peripheral surface of the basic shaft R4 and the outer peripheral surface presses the inner peripheral surface of the rear sleeve 1 in the radial direction. The gap is sealed.
This sealing effect prevents the adhesive A from leaking upward in FIG. 1 along the backbone shaft R4.

  The screw flange portion R <b> 5 is provided at a position where the male screw Rb is just before the female screw 3 c of the rear sleeve 3.

  The tube 7 is connected to the agent injection hole 1d, and the first liquid A1 is injected into the front sleeve 1. Further, the tube 8 is connected to the agent injection hole 1e, and the second liquid A2 is injected to the nozzle part 2 side with respect to the first liquid A1.

  At this discharge position, the rotational driving force of the driving unit M is transmitted to the rotor R through the flexible joint FJ, and the rotor R rotates with respect to the front and rear sleeves 1, 3 and the nozzle unit 2.

  In the discharge operation, as described above, the first liquid A1 and the second liquid A2 are respectively injected from the agent injection holes 1d and 1e, while the rotor part R is counterclockwise as viewed from the drive part M side by the drive part M. It rotates in the rotation direction RTL. Here, the first liquid A1 is a curing agent, and the second liquid A2 is a main agent.

Further, since the male screw R5 of the screw flange portion R5 is a right-hand screw, the rotation of the counterclockwise direction RT does not cause the male screw R5 and the female screw 3c to be engaged with each other.
Even with other actions, the rotor portion R does not move in the axial direction in this discharge operation.

As described above, since the collar portion Ra is formed by a spiral clockwise toward the needle portion R1 in the mixer portion R3, when the rotor R rotates in the RTL direction, the first liquid A1 is needled along the spiral. The second liquid A2 is mixed while being sent to the part R1 side, and thereafter, both liquids A1 and A2 become the mixed liquid A3 while being stirred and sent to the needle part R1 side.
And the liquid mixture conveyed to the needle part R1 side passes through the clearance S1 between the needle part R1 and the nozzle part 2 through the clearance between the shaft part R2 and the through-hole 2a of the nozzle part 2, and from the discharge port 2g to the outside. Discharged.

The discharge amount at this time is managed by the rotation amount of the rotor R.
That is, the discharge amount is set by the product of the volume defined by the pitch of the flange Ra and the gap shape between adjacent ribs Ra and the rotation amount of the rotor R in the mixer unit R3.

  Next, the stop position in a non-use state where the discharge operation is not performed will be described with reference to FIG. The stop position may be shifted when there is no discharge operation for a certain period, or may be transferred each time the discharge operation is completed. That is, by stopping the rotation of the rotor R, the discharge of the liquid from the discharge port is stopped, but if this state is maintained, there is a concern about the occurrence of liquid dripping, so the liquid exceeds the predetermined time set in advance. When stopping the discharge, the rotor R is moved to the stop position as described in detail below. As will be described later, this shift is executed by controlling the drive unit M of the control unit of the liquid coating apparatus 51 on which the nozzle device 50 is mounted.

After the discharge operation is completed, the drive unit M rotates the rotor R in the clockwise direction RTR as viewed from the drive unit M side.
By this rotation in the RTR direction, the male screw Rb of the screw flange portion R5 is screwed with the female screw 3c of the rear sleeve 3, and the rotor R moves along the axis CL toward the nozzle portion 2 (arrow FW direction). At this time, the flexible joint FJ that connects the connecting shaft R6 and the drive unit M extends from a predetermined position according to the amount of movement, and therefore does not hinder the movement of the rotor R in the axis CL direction.

By this movement, as shown in detail in FIG. 3, the surface R1a1 of the conical portion R1a of the needle portion R1 is in close contact with the inner surface 2e1 of the tapered portion 2e of the nozzle portion 2 (FIG. 3 shows the AA portion in FIG. Is an enlarged view).
In other words, the conical portion R1a of the needle portion R1 functions as a shut-off valve that blocks the discharge path when the adhesive A is discharged.
This is because the surface Ra1a which is the outer surface of the conical portion R1a is formed to have a conical or truncated cone side surface having a vertex on the tip side of the rotor portion R, while the inner surface 2e1 of the tapered portion 2e This is because the surface R1a1 is formed as a surface that can be in close contact with the surface Ra1a of R1a.

  Therefore, most of the adhesive A mixed in the mixer portion R3 is blocked by the conical portion R1a, which is a shutoff valve, immediately before the discharge port 2g, and is an adhesive that is outside the shutoff valve R1a and can drip under its own weight At is a very small amount in the vicinity of the apex R1a2 of the conical portion R1a as shown in FIG.

  If the amount is as small as this, the effect of surface tension works greatly, and the possibility of dripping due to its own weight is very small. Even if drooping due to external impact etc., the amount is very small, The degree can be minimized.

In FIG. 3, the position of the tip end surface 2f of the nozzle 2 in the axis CL direction is set so that the pointed portion R1a2 of the conical portion R1a does not protrude from the discharge port 2g, but it is of course not limited thereto.
Of course, it is possible to adopt a modified example in which the tip R2a2 is allowed to protrude from the discharge port 2g and the position of the front end surface 2f is set closer to the mixer unit R3 as shown in FIG. It is possible to further reduce the adhesive At1 accumulated outside the shutoff valve R1a.

Most preferably, the tip surface 2fα of the nozzle portion 2 is positioned at a position (α) where the inner diameter of the inner surface 2e1 of the tapered portion 2e is the diameter φ of the discharge hole 2g (shown by a one-dot chain line in FIG. 3). is there.
In this case, the adhesive which accumulates outside the conical portion R1a which is the shutoff valve is substantially eliminated, and dripping is completely prevented.

The return from the stop position to the discharge position is performed by the drive unit M again rotating the rotor R in the counterclockwise direction RTL as viewed from the drive unit M.
This rotation causes the rotor R to rise (upward in FIG. 1) because the male screw Rb of the screw flange portion R5 and the female screw 3c of the rear sleeve 3 are screwed with the right screw. As a result, the screwing is released. Thus, the rotor R becomes a discharge position.

According to the liquid discharge nozzle device described in detail above, since the shut-off valve that shuts off the discharge path is provided at a position very close to the discharge port when not in use, the amount of excess liquid that can drip under its own weight is extremely small, or It can be completely eliminated.
Thereby, what is called dripping can be prevented.
Needless to say, according to the configuration having this shut-off valve, it is possible to prevent the occurrence of dripping regardless of the diameter of the discharge port and the viscosity of the liquid.

FIG. 5 shows a liquid application device 51 equipped with the liquid discharge nozzle device 50 described above.
The liquid applying apparatus 51 is an apparatus that applies a liquid (for example, an adhesive A obtained by mixing the first liquid A1 and the second liquid A2) to the target TS.

  More specifically, this device 51 is connected to the liquid discharge nozzle device 50, tubes 7 and 8 for supplying one end to the sleeve 1 and supplying liquid into the sleeve 1, and the other ends of the tubes 7 and 8, respectively. Liquid tanks 17 and 18, a flexible joint FJ coupled to the coupling shaft R6 of the liquid discharge nozzle device 50, and a drive unit M that is a motor that rotationally drives the coupling shaft R6 via the flexible joint FJ. ing. The liquid tank 17 contains a curing agent as the first liquid A1, and the liquid tank 18 contains the second liquid A2 as the main agent.

The drive unit M and the liquid discharge nozzle device 50 are supported by the support base 19, and the control of the rotation control of the drive unit M and the remaining amount of liquid in the liquid tanks 17 and 18 and the supply amount to the tubes 7 and 8 are performed by the control unit. 20 is performed. An instruction to the control unit 20 can be executed from the outside via the computer 21.
In the rotation control of the drive unit M, the control unit 20 rotates the rotor R in the counterclockwise direction RTL when discharging the liquid, and rotates the rotor R clockwise when stopping the discharge after a predetermined time. Control is performed so that the shutoff valve R1a moves to a position where the discharge port 2g is blocked by rotating in the direction RTR.
When the shutoff valve R1a closes the discharge port 2g, the rotational resistance of the drive unit M becomes extremely large. This is detected by a sensor, and the control unit stops the rotation of the drive unit M based on the detection result.

  According to this liquid application device, it is possible to prevent liquid dripping when not in use, so that excess liquid does not adhere to and contaminate the application target, and useless liquid is not consumed. .

  The embodiment of the present invention is not limited to the configuration and procedure described above, and it goes without saying that modifications may be made without departing from the scope of the present invention.

Although the above-described embodiment has been described for mixing two types of liquids, the present invention is not limited to this. For example, a mixture of three or more types of liquids may be used, and a single type of liquid that does not need to be mixed may be discharged and applied.
The liquid discharge nozzle that discharges one type of liquid has one agent injection hole for the liquid discharge nozzle device 50 of the embodiment, or uses only one of the plurality, and other configurations and About operation | movement, it can implement | achieve by carrying out similarly to the thing of an Example.
The conical portion R1a at the tip of the needle portion R1 may have a truncated cone shape instead of a pointed cone shape. In that case, in the configuration shown in FIG. 4 corresponding to the enlarged view of the AA portion in FIG. 2, the pointed head can be prevented from protruding from the tip surface 2f, so that the tip of the rotor portion R is not chipped. This is preferable.

It is sectional drawing for demonstrating the Example of the liquid discharge nozzle of this invention. It is sectional drawing explaining the stop position in the Example of the liquid discharge nozzle of this invention. It is an expanded sectional view for demonstrating the principal part in the Example of the liquid discharge nozzle of this invention. It is an expanded sectional view for demonstrating the modification of the principal part in the Example of the liquid discharge nozzle of this invention. It is a figure for demonstrating the Example of the liquid coating device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front sleeve 1a Through-hole 1b Female screw 1c Male screw 1d, 1e Agent injection hole 2 Nozzle part 2a Through-hole 2b Male screw 2c Flange part 2d Cylindrical part 2e Tapered part 2e1 Inner surface 2f, 2f alpha Front end surface 2g Discharge port 3 Rear sleeve 3a Through-hole 3b 3c Female thread 4 Ring 5 Biasing member 7, 8 Tube 17, 18 Liquid tank 19 Support base 20 Control unit 21 Computer 50 Liquid discharge nozzle device 51 Liquid coating device A Adhesive (two-component curable adhesive)
A1 1st liquid A2 2nd liquid At, At1 (Collected) Adhesive CL Axis FJ Flexible joint M Drive unit (motor)
R Rotor R1 Needle part R1a Conical part (shutoff valve)
R1a1 Surface R1a2 Pointed head R1b Constant diameter portion R2 Shaft portion R3 Mixer portion R4 Core shaft portion R5 Screw flange portion R6 Connection shaft portion Ra Collar Rb Male thread S1, S2 Clearance ST Sleeve body

Claims (3)

A sleeve body to which a nozzle part having a discharge port formed on one end side is attached;
A rotor portion inserted into the sleeve body;
A spiral collar formed on the rotor portion;
When the liquid supplied to the inside of the sleeve body is rotated in the first direction of the rotor portion with respect to the sleeve body, the collar transports the liquid to the nozzle portion side and discharges the liquid from the discharge port. In the liquid discharge nozzle device,
The sleeve body and the rotor portion are each formed with a screw portion that is screwed together by rotation in a second direction opposite to the first direction, and the discharge portion is formed at a tip of the rotor portion on the nozzle portion side. Provide a shut-off valve that closes the outlet,
When the rotor part is rotated in the second direction, the screw parts are screwed together, and the rotor part moves to the nozzle part side by the screwing, and the shut-off valve part opens the discharge port. A liquid discharge nozzle device configured to be closed. The shut-off valve portion is formed such that an outer surface thereof becomes a side surface of a cone or a truncated cone having a vertex on a tip side of the rotor portion,
The liquid discharge nozzle device according to claim 1, wherein an inner surface on a tip side of the nozzle portion is formed as an inclined curved surface corresponding to an outer surface of the shut-off valve portion. 3. The liquid discharge nozzle device according to claim 1 or 2, a liquid injection pipe connected to the sleeve body of the liquid discharge nozzle device and injecting liquid into the sleeve body, and the rotor of the liquid discharge nozzle device A liquid application unit that applies a liquid to an object by ejecting the liquid from the ejection port of the liquid protruding nozzle device, and a drive unit that rotationally drives the unit; and a control unit that controls a rotation direction of the drive unit In the device
The control unit rotates the rotor unit in the first direction in the first state in which the liquid is ejected, and the liquid is not ejected from the first state for a predetermined time or more. A liquid coating apparatus that controls to rotate the rotor portion in the second direction during the transition to the second state.

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