KR102393993B1 - Dispenser system with preloaded piezoelectric actuator - Google Patents

Abstract

The present invention relates to a dispenser system employing a preload piezoelectric actuator, and more particularly, a preload piezoelectric that has a built-in spring for preload to prevent no-load damage of the piezoelectric actuator, and package it to prevent contamination and insulation breakdown It relates to a dispenser system employing an actuator.
The present invention is a system comprising a preload packaging housing provided with a piezoelectric actuator, and a nozzle provided with a needle reciprocating linearly by the piezoelectric actuator to open and close, the preload packaging housing, the piezoelectric actuator is located at the inner center an outer case part; an inner case part having one side fixed to the inner surface of the outer case part, and the other side having a through hole formed in the center; A transfer case part installed inside the inner case part, the piezoelectric actuator being fixed in the center, and linearly reciprocating according to the contraction and expansion of the piezoelectric actuator to enter and exit the through hole; And the inner case part and the transfer case It is provided between the parts, and one side is supported by the inner case part and the other side is made of a first elastic part supported by the transfer case part.

Description

Dispenser system with preloaded piezoelectric actuator

The present invention relates to a dispenser system employing a preload piezoelectric actuator, and more particularly, a spring provided for preload is built-in to increase the thin force of the piezoelectric actuator, prevent damage due to no-load operation, and package it to pollute And it relates to a dispenser system employing a preload piezoelectric actuator capable of preventing dielectric breakdown.

Recently, in many industrial fields, precise processing for fine fields is required. For example, precise manufacturing processes such as surface treatment of fine parts of circuit boards, insulation treatment of very small areas, or manufacturing method of light distribution spheres of LEDs with straightness are required. do.

This manufacturing process is mainly made by fluids such as insulating coating liquid or phosphors injected from the injection nozzle, and in general, the opening and closing of the injection nozzle is controlled by the reciprocating motion of a needle provided inside the injection nozzle. At this time, a method using a piezoelectric actuator rather than a conventional electromagnet motor is used so that the reciprocating motion of the needle is precisely and quickly controlled.

Although a method of configuring a single piezoelectric actuator or a plurality of piezoelectric actuators has been developed in the past, as shown in FIG. As a result, there is a problem that a collision between the needle and the nozzle occurs, and the high viscosity liquid is difficult to jet due to the weak torque. And, there was a problem that the operation error or failure was frequent due to the complicated structure.

KR 10-2009-0022824 A KR 10-1835572 B1

The present invention was invented to solve the above problems, and the preload is made by an elastic part inside the preload packaging housing in which the piezoelectric actuator is provided, thereby increasing the generating force of the actuator, and preventing the impact of the needle on the nozzle, An object of the present invention is to provide a dispenser system employing a preload piezoelectric actuator capable of preventing contamination from the outside and dielectric breakdown by packaging.

The object of the present invention is not limited to the object mentioned above, and other objects not mentioned will be clearly understood from the description below.

A dispenser system employing a preload piezoelectric actuator according to the present invention for achieving the above object is a system comprising a preload packaging housing having a piezoelectric actuator and a nozzle having a needle reciprocating linearly by the piezoelectric actuator and opening and closing , The preload packaging housing may include: an outer case in which the piezoelectric actuator is located at an inner center; an inner case part having one side fixed to the inner surface of the outer case part and the other side having a through-hole formed in the center; A transfer case part installed inside the inner case part, the piezoelectric actuator being fixed in the center, and linearly reciprocating according to the contraction and expansion of the piezoelectric actuator to enter and exit the through hole; And the inner case part and the transfer case It is provided between the parts, and one side is supported by the inner case part and the other side is technically characterized in that it consists of a first elastic part supported by the transfer case part.

The nozzle is provided with the needle, and is installed on the opposite side of the outlet of the nozzle to prevent the needle from being separated; and one side is supported by the nozzle case unit and the other side is a bent part formed in the center of the needle. It is an additional technical feature that it consists of a second elastic part supported.

The one side is located inside the preload packaging housing and is in contact with the contracted and expanded end of the piezoelectric actuator, and the other side is further provided with a lever part coupled to one side of the needle.

A pivot part facing the piezoelectric actuator and protruding so as to be spaced apart from the center of the piezoelectric actuator is formed on the inner surface of the outer case part, and a pivot part abutting the lever part is further provided on the other side of the side where the piezoelectric actuator and the lever part abut, It is technically characterized in that the linear reciprocating displacement of the needle by the piezoelectric actuator can be adjusted according to the positional movement of the pivot part.

Additionally, a waveform generator for supplying an alternating electrical signal to the piezoelectric actuator and an amplifier for amplifying and supplying the signal generated by the waveform generator are further provided.

The present invention according to the above configuration can expect the following effects.

Since the preload spring is provided, it is possible to prevent damage to the piezoelectric actuator that may occur due to vibration or impact when no load is applied. When an electric signal is applied to the piezoelectric actuator in a no-load state where there is no load, the actuator may be electro-mechanically damaged by itself. However, if there is a preload, there is an effect to prevent it even with no load.

Since the preload packaging housing in which the piezoelectric actuator is provided and the nozzle are separately provided, it is easy to replace the piezoelectric actuator or the needle of the nozzle, so that it is possible to quickly respond to a malfunction.

Due to the packaged preload packaging housing provided with the piezoelectric actuator, it is possible to increase the lifespan of the piezoelectric actuator by blocking external contaminants, thereby improving the economic effect. Reduction of failure due to blocking of these contaminants, prevention of insulation breakdown or securing of expected performance of the piezoelectric actuator can result in improved quality of products such as coatings produced by the present invention. Recalling that the present invention is applied to a fine work in which precision is strongly required, such quality improvement can be said to be very important in terms of effectiveness.

In addition, since it has a simple structure, it is possible to reduce manufacturing convenience and manufacturing cost, and ultimately, it is possible to obtain an improvement in price competitiveness.

Preload The preload is realized by the formation of an elastic part inside the packaging housing and the nozzle, so that the structure can be simplified. Conventionally, by using a damper or a spring on the outside of the nozzle to form an elastic part to form a preload, it is structurally complicated due to contamination by the fluid sprayed from the nozzle and interference with the object to be coated, which causes frequent failures and Although it caused difficulty in replacement, the present invention simply solved such a problem by having an elastic body therein.

The preload packaging housing and the nozzle are connected by a lever part, but the needle of the nozzle is made to reciprocate in a straight line as a lever principle by the pivot part formed on the inner surface of the outer case of the preload packaging housing. , by variously changing the shape or length of the corresponding lever part, it is very effective to amplify the micro displacement of the piezoelectric actuator to the required displacement.

1 is a block diagram showing a dispenser employing a conventional single piezoelectric actuator.
2 is a configuration diagram showing a dispenser employing a plurality of conventional piezoelectric actuators.
3 is an overall configuration diagram showing a dispenser system employing a preload piezoelectric actuator according to a preferred embodiment of the present invention.
4 is an exploded view of a configuration provided inside the preload packaging housing.
5 is a block diagram showing another embodiment of a dispenser system employing a preload piezoelectric actuator according to a preferred embodiment of the present invention.

Hereinafter, a dispenser system employing a preload piezoelectric actuator according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram showing a conventional dispenser employing a single piezoelectric actuator, Figure 2 is a configuration diagram showing a conventional dispenser employing a plurality of piezoelectric actuators, Figure 3 is a preload piezoelectric actuator according to a preferred embodiment of the present invention An overall configuration diagram showing the dispenser system employed, FIG. 4 is an exploded view of a configuration provided inside the preload packaging housing, and FIG. 5 is another embodiment of a dispenser system employing a preload piezoelectric actuator according to a preferred embodiment of the present invention. It is a configuration diagram.

For a smooth description, the upper part is the upper part, the lower part is the lower part, and the left-right direction is set as the side with the plane shown in FIGS. 1 to 5 as the center.

A dispenser system employing a preload piezoelectric actuator according to a preferred embodiment of the present invention is largely composed of a preload packaging housing (A) and a nozzle (B) as shown in FIG. 3 . The preload packaging housing (A) is composed of an outer case part 100 , an inner case part 200 , a transfer case part 300 , and a first elastic part 400 , and the nozzle B is a nozzle case part 500 . and a second elastic part 600 , and a lever part 700 connecting the same may be provided.

First, look at the preload packaging housing (A).

The preload packaging housing (A) may be provided with a piezoelectric actuator 10 therein. When the piezoelectric actuator 10 provided in the preload packaging housing A is contracted and expanded by an electric signal, this displacement causes a displacement of the needle 30 of the nozzle B, which will be described later, and finally the needle ( 30), the nozzle (B) can be opened and closed by the linear reciprocating motion.

The preload packaging housing A may include an outer case unit 100 , an inner case unit 200 , a transfer case unit 300 , and a first elastic unit 400 .

The outer case unit 100 serves to provide a space in which the piezoelectric actuator 10 and the inner case unit 200 to be described later, the transfer case unit 300 and the first elastic unit 400 can be provided therein. can The outer case part 100 may be configured in any shape, but is preferably configured in a rectangular parallelepiped shape in consideration of structural stability, manufacturing convenience, and ease of installation.

The inside of the outer case part 100 is provided in a hollow shape, and may be made of a metal material having predetermined strength and corrosion resistance to prevent external impacts or contaminants from entering.

It is preferable that the outer case part 100 is configured in a closed type as a whole, but in order to apply a linear reciprocating motion of the needle 30 by being connected to the upper end of the needle 30 provided in the nozzle (B), a lever to be described later inside Since the part 700 needs to be inserted, an opening may be formed in the part where the lever part 700 is inserted.

A pivot portion 110 capable of obtaining a lever effect by contacting one side of the lever portion 700 may protrude from the inner surface of the outer case portion 100 . The pivot unit 110 will be described together when the lever unit 700 is described.

The inner case part 200 may be fixedly installed on the inner surface of the outer case part 100 . One side of the inner case part 200 is fixedly installed on one side of the inner surface of the outer case part 100 , and is coupled by a bolt 210 to later replace the internal piezoelectric actuator 10 or the first elastic part 400 . It can be configured to facilitate separation.

The inner case part 200 can be in any shape, but it is important to note that the first elastic part 400 formed in a cylindrical shape is provided therein and that one side of the first elastic part 400 must be stably supported. Considering that, it is preferable to be formed in a cylindrical shape.

The inner case portion 200 is provided in a cylindrical shape, the side fixed to the inner surface of the outer case portion 100 is provided in a form vertically bent outward from the cylindrical outer peripheral surface, the outer case portion 100 from the outside It may be provided to be fixed by a penetrating bolt 210 .

The side on which the inner case unit 200 is fixed to the inner surface of the outer case unit 100 may be open. This is because the transfer case unit 300 provided with the piezoelectric actuator 10 to be described later is inserted therein so that a linear reciprocating motion can be performed.

A through hole 230 may be provided at the center of the opposite side of the side to which the inner case unit 200 is fixed to the inner surface of the outer case unit 100 , that is, the other end of which is not fixed. The through-hole 230 allows the transfer case unit 300 to be described later and the piezoelectric actuator 10 that can be fixed thereto to enter and exit, thereby pressing the lever unit 700 to control the opening and closing of the actuator 10 . However, since the inner surface of one side of the inner case portion 200 on which the through hole 230 is formed should be a support on which one side of the first elastic portion 400 to be described later is supported, the through hole 230 is a cylindrical inner case portion. It may have to have a relatively smaller diameter than the diameter of the base of (200).

A transfer case unit 300 capable of being fixedly coupled to the piezoelectric actuator 10 may be installed inside the inner case unit 200 . In the transfer case unit 300 , the piezoelectric actuator 10 may be fixedly installed therein, and it serves to perform a linear reciprocating motion according to the contraction and expansion of the piezoelectric actuator 10 .

The shape of the transfer case part 300 is preferably configured in the same shape as the shape of the inner case part 200 described above. That is, it is configured in a cylindrical shape, one side may be formed with a bent portion perpendicular to the outside from the outer circumferential surface of the cylinder.

In addition, similarly to the above-described inner case portion 200, one side is opened, through which the piezoelectric actuator 10 can be inserted. However, the other side of the open side may be formed so that a part of one end of the piezoelectric actuator 10 passes through, or it may be configured to be closed. According to the contraction and expansion of the piezoelectric actuator 10, the transfer case part 300 linearly reciprocates, and only has to press one side of the lever part 700 to be described later, so it can be selectively configured.

Additionally, the surface of the transfer case unit 300 in contact with the lever unit 700 is provided with a hemispherical protrusion shape so that the force transmission to the lever unit 700 can be more effective.

The diameter of the bottom of the transfer case part 300 is formed larger than the diameter of the piezoelectric actuator 10, but it can be formed to be relatively smaller or almost the same size than the through hole 230 formed in the inner case part 200 described above. there is. Vibration from the axial center of the linear reciprocating movement of the transfer case unit 300 to the left and right may adversely affect the linear reciprocating movement of the needle 30 of the nozzle (B) later, so it is desirable to suppress it as much as possible, so the transfer case The diameter of the bottom surface of the part 300 is substantially the same as the diameter of the through hole 230 of the inner case part 200, but it is preferable to provide it so that friction is minimized.

A first elastic part 400 may be provided between the transfer case part 300 and the inner case part 200 . The first elastic part 400 can be any configuration having elasticity, but it is installed inside the inner case part 200, and considering that the transfer case part 300 must be inserted in the center, a space is formed in the center It is preferably composed of a coil-type spring in the form of a cylinder.

One side of the first elastic part 400 may be supported by the inner case part 200 , and the other side may be supported by the transfer case part 300 . In detail, one side of the first elastic part 400 is supported on the inner surface of the inner case part 200 on the side where the through hole 230 is formed, that is, the inner surface formed around the through hole 230 , The other side of the first elastic part 400 may be supported by a vertically bent portion on the outer circumferential surface of the transfer case part 300 . Looking at this configuration, since the inner case part 200 on which one side of the first elastic part 400 is supported is fixed to the outer case part 100 , the elastic force of the first elastic part 400 is the transfer case part 300 . ), and as a result, a preload of about 5 to 10% is applied to the piezoelectric actuator 10, and even when no load is applied, the piezoelectric actuator 10 is damaged by vibration or impact. be able to prevent it from happening. In addition, due to the presence of such a preload, a thermodynamic effect of increasing the generating force of the piezoelectric actuator 10 can be obtained.

Next, look at the nozzle (B).

As for the nozzle (B), the fluid is supplied to the inside of the nozzle (B) from the tank 50 provided on one side of the discharge port, and the needle 30 makes a linear reciprocating motion by the operation of the above-described piezoelectric actuator 10, and the nozzle ( As the discharge port of B) is opened and closed, it may serve to cause the internal fluid to be sprayed from the discharge port of the nozzle (B).

The nozzle (B) is provided with a general configuration of a needle 30 inserted therein so that opening and closing can be adjusted, and the nozzle case part 500 and the second elasticity therein so that the needle 30 can be installed therein. A unit 600 may be provided.

The configuration of the nozzle (B) and the needle 30 corresponds to a general form, so a detailed description will be omitted, however, in the case of the needle 30, a bend formed vertically outward from the outer circumferential surface of the needle 30 at the center of the needle 30 An addition may be formed.

The nozzle case unit 500 is fixedly installed on the opposite side of the nozzle (B) outlet, and serves to provide a space in which the needle 30 can be provided in the nozzle (B), and can be provided in the needle 30 Interaction with the O-ring 40 may serve to seal the nozzle (B).

One side of the nozzle case unit 500 is fixedly coupled to the opposite side of the nozzle (B) outlet, and the other side has an opening formed in the center, so that one side of the needle 30 provided inside the nozzle case unit 500 is to be penetrated. can One side of the needle 30 formed through the nozzle case part 500 is coupled with the lever part 700 to be described later, and by using the displacement according to the contraction and expansion of the piezoelectric actuator 10 described above, the needle ( 30), the linear reciprocating motion can be applied.

The needle 30 is located inside the nozzle case part 500, and as described above, between the opened part of the nozzle case part 500 and the bent part of the needle 30, the second elastic part 600. can be formed. In detail, one side of the second elastic part 600 may be supported on a peripheral inner surface of the opened portion of the nozzle case part 500 , and the other side may be supported on a horizontal surface of the bent part of the needle 30 .

The second elastic part 600 closes the nozzle (B) even with a small force due to the elastic force when the needle 30 reciprocates and pressurizes, especially when the nozzle (B) is opened and then closed by the needle (30). can be made, and it can serve to maintain the nozzle (B) in a closed state by the elastic force even when there is no load.

A second elastic part 600 may be provided on one side around the bent part formed on the needle 30 , and a plurality of O-rings 40 may be provided on the other side. The fluid introduced into the nozzle (B) by the O-ring (40) can be prevented from flowing out toward the nozzle case unit (500).

Next, look at the lever part 700 .

The lever part 700 mechanically connects the piezoelectric actuator 10 and the needle 30, so that the contraction and expansion displacement of the piezoelectric actuator 10 can be applied as a linear reciprocating motion of the needle 30. do.

Specifically, the lever part 700, in addition to the mechanical connection of the piezoelectric actuator 10 and the needle 30, a small displacement of the piezoelectric actuator 10 with the pivot part 110 as a hinge, and the lever part 700 By expanding in proportion to the length of the, it can serve to transmit the torque to the nozzle (B).

One side of the lever part 700 may be located inside the preload packaging housing A, and the other side may be coupled to one side of the needle 30 . One side positioned inside the preload packaging housing (A) may be provided to make surface contact with the piezoelectric actuator 10 or the transfer case unit 300 moved by the piezoelectric actuator 10 .

A protruding pivot part 110 may be provided on the inner surface of the outer case part 100 opposite to the contracted and expanded end of the piezoelectric actuator 10 . However, the center of the pivot part 110 is formed to be spaced apart from the center of the piezoelectric actuator 10, and the lever part 700 may be formed to abut against the opposite surface of the surface in contact with the piezoelectric actuator 10. .

The lever part 700 may be configured in various shapes, such as a straight shape or a bent type, depending on the place where the present invention is installed and the shape thereof. FIG. 3 shows a bent lever part 700 , and FIG. 4 shows a straight lever part 700 .

Referring to FIG. 3 , when the piezoelectric actuator 10 is elongated due to this configuration and the surface in contact with the lever part 700 is pressed downward, the pivot part 110 as the center of the lever, the lever The other side of which the lever part 700 is coupled to the needle 30 by the action rises upward.

Using this characteristic of the lever action, the point where the piezoelectric actuator 10 and the lever part 700 and the pivot part 110 and the lever part 700 abut, or the entire length of the lever part 700 is adjusted By doing so, it is possible to adjust to give a large displacement to the linear reciprocating motion of the needle 30 even in the contraction and expansion of the piezoelectric actuator 10 of small displacement.

For example, if the separation distance between the pivot part 110 and the center of the piezoelectric actuator 10 is shortened, the width of the displacement of the linear reciprocating motion of the needle 30 is relatively large, and the pivot part 110 ) and the center of the piezoelectric actuator 10 are long, the width of the displacement of the linear reciprocating motion of the needle 30 is relatively small despite the contraction and expansion displacement of the same piezoelectric actuator 10. can be obtained

Additionally, the electrical signal supplied to the piezoelectric actuator 10 may be supplied by amplifying the signal generated by the function generator 800 by the amplifier 900 . In addition, pulses, triangle waves, and sine waves, which are AC waveforms, can be produced and supplied for vertical operation. In addition, by providing a laser displacement sensor capable of measuring the displacement of the linear reciprocating motion on one side of the needle 30, the opening and closing of the actuator 10 can be properly maintained. The displacement width of the linear reciprocating motion of the needle 30 It is also possible to measure whether this is maintained.

The above-described embodiments are merely exemplary, and those of ordinary skill in the art can variously modified other embodiments therefrom.

Therefore, the true technical protection scope of the present invention should include not only the above embodiments but also other embodiments variously modified by the technical spirit of the invention described in the claims below.

10: piezoelectric actuator
20: nozzle outlet
30: needle
40: O-ring
50: tank
100: outer case part
110: pivot unit
200: inner case part
210: volt
230: through hole
300: transfer case unit
400: first elastic part
500: nozzle case part
600: second elastic part
700: lever part
800: waveform generator
900: amplifier
A: Preload packaging housing
B: Nozzle

Claims (7)

In the system consisting of a preload packaging housing provided with a piezoelectric actuator, and a nozzle provided with a needle reciprocating linearly by the piezoelectric actuator to open and close,
The preload packaging housing,
an outer case portion in which the piezoelectric actuator is located in the inner center;
an inner case part having one side fixed to the inner surface of the outer case part, and the other side having a through hole formed in the center;
A transfer case part installed inside the inner case part, the piezoelectric actuator being fixed in the center, and linearly reciprocating according to the contraction and expansion of the piezoelectric actuator so that it enters and leaves the through hole; And
A dispenser system employing a preload piezoelectric actuator, which is provided between the inner case part and the transfer case part, and comprises a first elastic part that is supported on one side by the inner case part and the other side is supported by the transfer case part. According to claim 1,
The nozzle is provided with the needle,
Doedoe installed on the opposite side of the outlet of the nozzle, a nozzle case portion for preventing the needle from being separated; And
A dispenser system employing a preload piezoelectric actuator, characterized in that one side is supported by the nozzle case part and the other side is made of a second elastic part supported by a bent part formed in the center of the needle. According to claim 1,
A dispenser system employing a preload piezoelectric actuator, characterized in that one side is located inside the preload packaging housing and is in contact with the contracted and expanded end of the piezoelectric actuator, and the other side is further provided with a lever coupled to one side of the needle. 4. The method of claim 3,
On the inner surface of the outer case part, facing the piezoelectric actuator, the center is formed to protrude so as to be spaced apart from the center of the piezoelectric actuator, and the other side of the side where the piezoelectric actuator and the lever part abut is further provided with a pivot part in contact with the lever part. Dispenser system employing a preload piezoelectric actuator, which is characterized. 5. The method of claim 4,
A dispenser system employing a preload piezoelectric actuator, characterized in that the linear reciprocating displacement of the needle by the piezoelectric actuator can be adjusted according to the movement of the pivot part. According to claim 1,
A dispenser system employing a preload piezoelectric actuator, characterized in that it further comprises a waveform generator for supplying an electrical signal to the piezoelectric actuator and an amplifier for amplifying and supplying the signal generated by the waveform generator. 7. The method of claim 6,
A dispenser system employing a preload piezoelectric actuator, characterized in that the electrical signal supplied from the waveform generator is an AC waveform.

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