KR20210015310A - Device for discharging liquid - Google Patents

Abstract

The present invention relates to a liquid discharge device, wherein consistent dispensing precision can be maintained by constantly keeping pressure applied to a liquid, and the device is improved so that a liquid does not flow back between a barrel and a plunger while discharging a high-viscosity liquid. The liquid discharge device comprises: a housing; a driving motor installed at one side inside the housing; a screw shaft rotated and installed at one side of the rotation shaft of the driving motor; a linear transfer device installed at the screw shaft to move forward and backward according to the rotation of the screw shaft; a barrel coupled to the front end of the housing so that a predetermined liquid is stored therein and discharged to the outside; a plunger inserted into and mounted slidably in the barrel, and connected and mounted to the front end of the linear transfer device; and a barrel nut for coupling the barrel and the housing.

Description

Liquid discharge device{DEVICE FOR DISCHARGING LIQUID}

The present invention relates to a liquid discharge device, and more particularly, an improved liquid that can maintain a consistent discharge precision by maintaining a constant pressure applied to the liquid, and prevents the liquid from flowing backward between the barrel and the plunger while discharging the liquid of high viscosity. It relates to a discharge device.

In general, fluids having different properties such as adhesives, sealants, lubricants, and liquid discharge devices having various viscosity ranges are used, and pneumatic liquid discharge devices are widely used for such liquid discharge devices.

The reason why the pneumatic liquid discharge device is widely used is because it is light weight, very simple to operate, and relatively low in cost incurred during the manufacturing process and use.

Moreover, the technology of the pneumatic liquid discharge device has been steadily developed and has been widely used in many fields.

Such a pneumatic liquid discharge device can be operated to accurately and reliably dispense a predetermined amount of fluid.

In recent years, application to highly functional liquids has become common, and more finer and more precise liquid discharge is required.

When the pneumatic liquid discharge device is applied to this requirement, the pressure applied to the liquid due to the hydraulic head difference is different while the remaining amount of liquid in the barrel decreases, so that while all the liquid inside the barrel is discharged. Cannot maintain consistent discharge precision.

In addition, when a liquid having a high viscosity is discharged, a phenomenon in which the liquid flows backward between the barrel and the plunger occurs.

Accordingly, the conventional pneumatic liquid discharge device is difficult to maintain consistent discharge precision, and in the case of a liquid containing a large amount of silver (Ag) particles which is expensive (for example, conductive epoxy or heat dissipating grease), the liquid filled inside the barrel It is not possible to use 100%, and a large amount of refluxed liquid is discarded, resulting in economic damage.

On the other hand, as a prior document related to the present invention to be described later, there is a linear-operated pneumatic distribution system and a method of Korean Patent Publication No. 10-2007-0036711 (published on April 03, 2007).

The linear actuation pneumatic dispensing system and method thereof of the prior patent described above have volumetric precision and repeatability, and provide a simple, lightweight, inexpensive, and faster overall fluid dispensing cycle.

However, the linearly actuated pneumatic distribution system and method of the prior patent have the above-described problems.

The present invention was created to solve the above problems, and to maintain a consistent discharge precision by maintaining a constant pressure applied to the liquid, and to prevent the liquid from flowing backward between the barrel and the plunger while discharging the liquid of high viscosity. Its purpose is to provide a liquid discharge device.

The liquid discharge device of the present invention for achieving the above object,

A housing;

A driving motor installed inside the housing;

A screw shaft installed on one side of a rotation shaft of the drive motor to rotate;

A linear transfer device installed on the screw shaft to perform forward and backward transfer according to the rotation of the screw shaft;

A barrel coupled to the front end of the housing to store a predetermined liquid therein and to be discharged to the outside;

A plunger that is inserted and mounted to be slidably movable inside the barrel, and is connected to the tip of the linear transfer device and mounted;

It characterized in that it includes; a barrel nut for coupling the barrel and the housing.

In the present invention, a coupling nut is provided to connect the screw shaft and the linear transfer device to be coupled.

In the present invention, a rotation sensor is provided on one side of the rotation shaft to detect the operation of the rotation shaft.

In the present invention, the drive motor includes a motor capable of rotational division.

In the present invention, the plunger comprises: a body; An upper contact part and a lower contact part provided at the upper and lower ends of the body in contact with the inner circumferential surface of the barrel to enable sliding movement, and a variable in which the outer diameter of the lower contact part is variable between the lower contact part and the body. A groove is formed.

In the present invention, the linear transfer device includes: a hollow member fixed to the screw shaft and interlocked with the screw shaft; A plurality of ball members continuously installed on the lower outer circumferential surface of the hollow member in the longitudinal direction; A fixing member accommodating the ball member and coupled to the inner circumferential surface of the housing; And a bushing member that allows the fixing member, the ball member, and the hollow member to be installed in their original positions.

In the present invention, a magnet member installed at the tip of the linear transfer device is provided.

In the present invention, a connection member for connecting the plunger and the magnet member is provided between the plunger and the magnet member.

In the present invention, the connection member is made such that one end is attached to the magnet member and the other side is closely inserted into the plunger.

In the present invention, the connection member includes: a case in which a rear end is coupled to a front end of the linear transfer device, and a front end is coupled to the plunger; An attachment part installed on the case and attached to the magnet member; At least one is installed on the outer side of the case to maintain watertightness or airtightness between the barrel and the case; and includes, and air existing inside the upper portion of the barrel or inside the plunger is outside the barrel A vent hole is formed so that it can be discharged.

According to an embodiment of the present invention, a barrel and a plunger are connected to the front end of a linear transfer device operated by a drive motor, and the linear transfer device is driven by a driving motor when liquid is discharged to move the plunger forward sliding inside the barrel. The plunger feed amount can be precisely controlled by applying.

Therefore, there is no difference in head head inside the barrel, so that the pressure applied to the liquid is always constant, so that while all the liquid inside the barrel is discharged, the liquid can be discharged consistently or continuously through the lower discharge part of the barrel. You can maintain precision.

In addition, by connecting the plunger and the linear transfer device using a magnetic member, the problem of disconnection between the plunger and the linear transfer device during the liquid discharge operation can be prevented, and the plunger can be easily removed when desired from the linear transfer device. I can.

Therefore, it is possible to prevent a discharging work defect during liquid discharging work.

And because the sealing material is applied, it is possible to prevent the liquid from flowing back over the plunger.

Therefore, consistent discharging precision can be maintained at all times, and all liquids filled in the barrel can be discharged, resulting in cost savings compared to the conventional one.

1 is a block diagram showing a configuration of a main part of a liquid discharge device according to the present invention.
2A is a block diagram showing the configuration of a liquid discharge device according to a first embodiment of the present invention.
Fig. 2B is a detailed cross-sectional view of the configuration of main parts of Fig. 2A.
Figure 2c is a detailed cross-sectional view showing the plunger installation state in Figure 2b.
3A is a block diagram showing the configuration of a liquid discharge device according to a second embodiment of the present invention.
3B is a detailed cross-sectional view of the configuration of the main parts of FIG. 3A.
4A is a block diagram showing a configuration of a liquid discharge device according to a third embodiment of the present invention.
Figure 4b is a detailed cross-sectional view of the configuration of the main part of Figure 4a.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the configuration of a main part of a liquid discharge device according to the present invention.

And Figure 2a is a configuration diagram showing the configuration of the liquid discharge device according to the first embodiment of the present invention, Figure 2b is a detailed cross-sectional view of the main portion of Figure 2a is shown, and Figure 2c is a plunger in Figure 2b A detailed cross-sectional view showing the installation state is shown.

In addition, Fig. 3A is a block diagram showing a configuration of a liquid discharging device according to a second embodiment of the present invention, and Fig. 3B is a detailed cross-sectional view of the configuration of the main parts of Fig. 3A.

4A is a block diagram showing a configuration of a liquid discharging apparatus according to a third embodiment of the present invention, and FIG. 4B is a detailed cross-sectional view showing the configuration of the main parts of FIG. 4A.

1 to 4B, first, as shown in FIG. 1, the liquid discharge device according to the present invention includes a cylindrical housing 10, and a drive motor 20 installed at an upper end of one inner side of the housing 10. ), and a screw shaft 50 installed on one side of the rotation shaft 22 of the drive motor 20 to rotate, and the screw shaft 50 installed on the screw shaft 50 to move forward and backward according to the rotation of the screw shaft 50 A linear transfer device 60 for performing a function, and a magnet member 70 installed at the front end (lower end in the drawing) of the linear transfer device 60 are included.

In addition, the liquid discharge device according to the present invention includes a coupling nut 40 provided to be coupled by connecting the screw shaft 50 and the hollow member 63 of the linear transfer device 60 to be described later, and the rotation shaft 22 A rotation detection sensor 30 that is installed on one side of the rotation shaft 22 to detect the operation of the rotation shaft 22, for example, rotation speed, rotation angle, etc., and a driving motor 20 installed at the rear end (upper part in the drawing) of the housing 10 ) Is provided with a power supply unit 21 for applying power.

The driving motor 20 includes, for example, a servo motor or a step motor capable of forward rotation and reverse rotation and rotational division.

In addition, the linear transfer device 60, as shown in FIG. 1, is fastened to and fixed to the screw shaft 50 by the coupling nut 40, the hollow member 63 interlocking with the screw shaft 50 ), and a plurality of ball members 62 continuously installed in the longitudinal direction on the lower outer circumferential surface of the hollow member 63, and a fixing member to accommodate the ball member 62 and coupled to the inner circumferential surface of the housing 10 61 and a bushing member 90 for stably installing the fixing member 61, the ball member 62 and the hollow member 63 in the original position.

Therefore, the magnet member 70 is installed while being fitted to the hollow tip of the hollow member 63, at this time, the front end of the hollow member 63 so that the magnet member 70 is stably fitted and coupled to the hollow member 63 In the fixture 71 is installed.

And, as shown in Figures 2a to 4b, the liquid discharge device according to the present invention is coupled to the front end of the housing 10 to store a predetermined (viscous) liquid in the inner 111, the lower discharge part 112 ) And the barrel 110 provided to be discharged to the outside through the barrel 110, and inserted and mounted to be slidably movable in the inside 111 of the barrel 110, but connected to the front end of the magnet member 70 or the linear transfer device 60 And a mounted plunger 120a and a barrel nut 80 for coupling the barrel 110 and the housing 10 to each other.

In addition, the barrel nut 80 is provided so that the barrel 110 is detachably attached to the housing 10.

And the plunger (120a), as shown in Figure 2b, the body 122, and the upper end of the body 122 so as to be in contact with the inner circumferential surface of the inner 111 of the barrel 110 to enable sliding movement. An upper contact portion 121 and a lower contact portion 123 provided at the lower end are provided.

In this case, a variable groove 124 is formed inside the lower contact part 123 so that the outer diameter of the lower contact part 123 is variable.

Accordingly, it is possible to easily insert the plunger 120a into the inside 111 of the barrel 110.

In addition, the lower portion of the plunger 120a has a conical shape in which the streamlined shape is emphasized, and the upper portion has an opening 127 communicating with the internal groove 126.

And, as shown in Figures 2a to 2c, in the liquid discharge device according to the first embodiment of the present invention, a plunger (120a) and a magnet member (70) between the plunger (120a) and the magnet member (70). A first connecting member 120b to connect is provided.

That is, the first connection member 120b is configured to connect the magnet member 70 and the plunger 120a so that the plunger 120a can be transferred by the linear transfer device 60, and one end of the magnet member ( 70) and the other side is inserted into the inner groove 126 of the plunger 120a to be closely inserted into the protrusion 125 of the plunger 120a.

Accordingly, the first connection member 120b attached to the magnet member 70 and installed in close contact with the plunger 120a is pushed or pulled by the plunger 120a by the linear transfer device 60.

The first connection member 120b may be made of a metal material such as iron (Fe) so that it can be attached to the magnet member 70 by magnetic force, or may be made of another magnetic member such as the magnet member 70.

In addition, as shown in FIGS. 3A and 3B, in the case of the liquid discharge device according to the second embodiment of the present invention, the front end of the hollow member 63 in which the magnet member 70 is installed is the plunger 120a. It was installed to fit into the opening 127.

Therefore, in the case of the liquid discharge device according to the second embodiment of the present invention shown in FIGS. 3A and 3B, the linear transfer device 60 is configured to directly transfer the plunger 120a.

And, as shown in Figures 4a and 4b, the liquid discharge device according to the third embodiment of the present invention is provided with a second connection member 140 connecting the magnet member 70 and the plunger (120a), The second connection member 140 has a rear end coupled to the front end of the hollow member 63 of the linear transfer device 60, and a front end coupled to the opening 127 of the plunger 120a. And, the attachment portion 142 installed on the case 141 and attached to the magnet member 70, and at least one is installed on the outer side of the case 141, between the barrel 110 and the case 141 It is configured to include a sealing material 143 to maintain watertight or airtightness.

In this case, the attachment part 142 may be made of a metal material such as iron that can be attached to the magnet member 70 as described above, or may be made of another magnet member such as the magnet member 70.

The sealing material 143 may be a generally widely used O-ring.

In addition, reference numeral 146, which is not described in FIGS. 4A and 4B, denotes a vent hole formed to allow air present in the upper interior 111 or the plunger 120a of the barrel 110 to be discharged to the outside of the barrel 110 ( vent hole).

In addition, an insertion groove 145 is formed in the upper portion of the case 141 so that the tip of the hollow member 161 can be inserted.

On the other hand, it goes without saying that an operation device or a control device (not shown) for driving the linear transfer device 60 is provided outside the housing 10.

The operation of the liquid discharge device according to the present invention having the configuration as described above will be described as follows.

First, as shown in FIGS. 1 to 2C, when power is applied through the power supply unit 21 to drive the drive motor 20, the rotation shaft 22 rotates, and the rotation shaft 22 rotates. According to this, the screw shaft 50 coupled to the rotation shaft 22 rotates.

In addition, as the screw shaft 50 rotates, the hollow member 63 fastened to the screw shaft 50 is transferred forward or backward by the ball member 62.

That is, when the drive motor 20 rotates forward, the hollow member 63 performs forward transfer, and when the drive motor 20 rotates backward, the hollow member 63 performs reverse transfer.

Accordingly, the plunger 120a detachably coupled to the front end of the hollow member 63 is transferred forward or backward in the interior 111 of the barrel 110.

At this time, when the plunger 120a is forwardly transferred from the inside 111 of the barrel 110, the liquid in the inside 111 of the barrel 110 is discharged through the lower discharge portion 112 of the barrel 110. .

On the other hand, in order to repeatedly discharge a certain amount of the liquid stored in the inside 111 of the barrel 110, a plunger 120a is mounted in the inside 111 of the barrel 110 to pressurize the liquid at a constant pressure and discharge the liquid. Should be done.

In addition, the cross-sectional area of the inside 111 of the barrel 110 is formed from top to bottom, and the plunger 120a must be lowered to a certain height according to the amount of liquid to be discharged.

However, as described above, in the case of a conventional pneumatic liquid discharge device, while the liquid inside the barrel is discharged, the pressure applied to the liquid is different due to the head difference as the remaining amount decreases while the liquid inside the barrel is discharged. Consistent discharge precision could not be maintained.

And, when discharging the liquid of high viscosity, the liquid flowed back between the barrel and the plunger.

Accordingly, the conventional pneumatic liquid discharge device has a problem in that it is difficult to maintain consistent discharge precision, and in the case of expensive liquids, 100% of the liquid filled in the barrel cannot be used and a large amount of backflow liquid is discarded.

Accordingly, conventionally, there is a problem in that liquid is wasted, productivity is lowered due to poor liquid discharge workability, and thus cost is increased.

However, in the liquid discharge device according to the present invention, the barrel 110 and the plunger 120a are connected to the front end of the linear transfer device 60 operated by the drive motor 20, and the linear transfer when liquid is discharged. The device 60 is driven by a driving motor 20 to move the plunger 120a forward slidingly inside the barrel 110.

In particular, the drive motor 20 is a motor that can be divided into rotation, and a rotation detection sensor 30 is provided on the rotation shaft 22 of the driving motor 20, so that the rotation shaft 22 of the driving motor 20 rotates. Speed and rotation angle can be precisely controlled.

Accordingly, the rotation of the screw shaft 50 coupled to the rotation shaft 22 of the drive motor 20 can be precisely controlled, so that the linear transfer device 60 can be accurately transferred, and eventually the plunger 120a It is possible to precisely control the transfer amount.

That is, it is possible to precisely control the plunger 120a as much as a desired transfer amount.

Moreover, in the liquid discharge device according to the present invention, since the plunger 120a is directly connected by the linear transfer device 60 driven by the drive motor 20, the plunger 120a is (110) It can prevent the phenomenon of being pushed back.

Therefore, there is no head difference in the inside 111 of the barrel 110, so that the pressure exerted by the plunger 120a to the liquid in the inside 111 of the barrel 110 is always constant, so that the inside 111 of the barrel 110 is While discharging all of the liquid, it is possible to consistently or continuously discharge the liquid by a predetermined amount through the lower discharging portion 112 of the barrel 110, thereby maintaining consistent discharging precision.

In addition, by connecting the plunger (120a) and the linear transfer device (60) using a magnet member (70), the problem of disconnection between the plunger (120a) and the linear transfer device (60) during liquid discharge operation is prevented. If desired, the plunger 120a from the linear transfer device 60 can be easily separated.

And, as shown in Figs. 3a and 3b, since the plunger 120a can be directly fitted to the hollow member 63 at the tip of the linear transfer device 60, the plunger 120a and the linear The problem of disconnection of the transfer device 60 can be prevented.

Therefore, it is possible to prevent a discharging work defect during liquid discharging work.

In addition, as shown in FIGS. 4A and 4B, since a sealing material 143 such as an O-ring is mounted on the outer circumferential surface of the case 141, it is possible to prevent the liquid from flowing backward over the plunger 120a.

In addition, at least one vent hole is formed in the case 141, so that the air present in the upper interior 111 of the barrel 110 or the inside of the plunger 120a is discharged to the outside of the barrel 110. As a result, abnormal air pressure is not formed in the inside 111 of the barrel 110.

Accordingly, since the plunger 120a is not affected by the air pressure inside the barrel 110, the precise discharge operation can be performed.

Therefore, it is possible to maintain consistent discharge precision at all times, and since all liquid filled in the barrel 110 can be discharged, there is an advantage in cost reduction compared to the conventional one.

As described above, the present invention has been described with reference to an embodiment shown in the drawings, but this is only exemplary, and various modifications and equivalent embodiments are possible from those of ordinary skill in the art. Will understand.

Therefore, the true scope of protection of the present invention should be determined only by the appended claims.

10. Housing
20. Drive motor
21. Power supply
22. Rotary shaft
30. Rotation sensor
40. Combination nut
50. Screw shaft
60. Linear transfer device
61. Fixing member
62. Ball member
63. Hollow member
70. Magnet member
110. Barrel
120a. plunger
120b. First connecting member
140. Second connecting member
143. Sealing material

Claims (11)

A housing;
A driving motor installed inside the housing;
A screw shaft installed on one side of a rotation shaft of the drive motor to rotate;
A linear transfer device installed on the screw shaft to perform forward and backward transfer according to the rotation of the screw shaft;
A barrel coupled to the front end of the housing to store a predetermined liquid therein and to be discharged to the outside;
A plunger that is inserted and mounted to be slidably movable inside the barrel, and is connected to the front end of the linear transfer device and mounted;
And a barrel nut configured to couple the barrel and the housing. The method of claim 1,
A liquid discharging device comprising a coupling nut for connecting the screw shaft and the linear transfer device to be coupled. The method of claim 1,
A liquid dispensing device, characterized in that it is provided with a rotation detection sensor installed on one side of the rotation shaft to detect the operation of the rotation shaft. The method of claim 1,
The drive motor is a liquid discharge device, characterized in that it comprises a motor capable of dividing rotation. The method of claim 1,
The plunger,
Body and;
An upper contact portion and a lower contact portion provided at the upper and lower ends of the body in contact with the inner circumferential surface of the barrel to enable sliding movement; is provided,
A liquid dispensing device, characterized in that a variable groove is formed between the lower contact part and the body so that the outer diameter of the lower contact part is variable. The method of claim 1,
The linear transfer device,
A hollow member fixed to the screw shaft and interlocked with the screw shaft;
A plurality of ball members continuously installed on the lower outer circumferential surface of the hollow member in the longitudinal direction;
A fixing member accommodating the ball member and coupled to the inner circumferential surface of the housing;
And a bushing member that allows the fixing member, the ball member, and the hollow member to be installed in their original positions. The method of claim 1,
Liquid discharge device, characterized in that provided with a magnet member installed at the front end of the linear transfer device. The method of claim 7,
And a connection member connecting the plunger and the magnet member between the plunger and the magnet member. The method of claim 8,
The connecting member,
A liquid discharging device, characterized in that one end is attached to the magnet member and the other end is closely inserted into the plunger. The method of claim 8,
The connecting member,
A case in which a rear end is coupled to a front end of the linear transfer device, and a front end is coupled to the plunger;
An attachment part installed on the case and attached to the magnet member;
And a sealing material that is installed on an outer side of the case to maintain watertightness or airtightness between the barrel and the case. The method of claim 10,
A liquid discharge device, characterized in that a vent hole is formed so that the air existing inside the upper part of the barrel or inside the plunger is discharged to the outside of the barrel.

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