KR20060036962A - Precise discharge type apparatus for dot dispensing - Google Patents

Abstract

The present invention discloses a precise quantitative dispensing point application device. The present invention disclosed is a discharge body portion is installed various internal and external mounting; A lift part which is built in the discharge body part and opens and closes the clearance space for discharging the adhesive by vertical reciprocating motion; A pneumatic valve mounted on one side of the discharge body to control a vertical reciprocating motion of the elevating unit by power pneumatic; An adhesive pressure feeding part mounted on the other side of the discharge body part to convey an adhesive; a discharge amount adjusting part mounted on an upper part of the discharge body part to adjust the discharge amount of the adhesive by measuring the stroke number of the lifting part; And a dispensing valve unit mounted at a lower end of the discharge body unit to form a pneumatic guide wall by compressed air to dispense a fixed amount of adhesive.

According to the present invention, it is provided with an air jet valve to form a pneumatic guide wall by compressed air to suppress the generation of the tail of the adhesive discharged from the needle tip, and to enable precise quantitative discharge in the desired discharge direction without aggregation of the adhesive Since the Z-axis lifting and driving of the needle is unnecessary, the reaction speed is increased and workability is increased. In addition, according to the present invention, the nozzle shape of the air jet valve can discharge a certain amount of dot ball in the correct position in the form of a sphere, so that precise surface mounting work by precise control can be performed, and the needle tip adhesive There is no change of starting point and end point because there is no agglomeration, and it is possible to do line work by continuous progress of dotting work.

Spot Applicator, Dispensing Valve, Dotting Nozzle, Air Jet Valve, Air Jet Nozzle, Air Jet Coupler

Description

Precise quantitative dispensing device {PRECISE DISCHARGE TYPE APPARATUS FOR DOT DISPENSING}

1 is a front configuration cross-sectional view of a precision quantitative discharging point application device according to an embodiment of the present invention.

Figure 2 is an excerpt configuration cross-sectional view of the piston of the present invention.

Figure 3 is an excerpt configuration diagram of the dispensing valve portion of the present invention, Figure 3a is a perspective view, Figure 3b is a front cross-sectional view, Figure 3c is a view showing the flow of compressed air through the dispensing valve portion.

Figure 4 is an excerpt configuration cross-sectional view of the dotting nozzle of the present invention.

5 is an excerpt configuration diagram of the air jet valve according to the present invention. FIG. 5A is a front sectional view thereof, and FIG. 5B is a plan view thereof.

Figure 6 is an excerpt configuration diagram of the air jet coupler of the present invention, Figure 6a is a front view thereof, Figure 6b is a plan view thereof.

Figure 7 is a block diagram showing the heater block of the present invention mounted on the dispensing valve, Figure 7a is a front cross-sectional view, Figure 7b is a plan view thereof.

Figure 8 is a view showing the operation sequence of the precision quantitative discharging type dot coating apparatus according to an embodiment of the present invention, Figure 8a is a state in which the apparatus is moved to the discharge position and waiting, Figure 8b is injected compressed air for discharge 8C is a state in which the adhesive is started to be discharged, FIG. 8D is a state in which the adhesive is discharged and descends, and FIG. 8E is a state in which the discharged adhesive is seated at the bonding position and the discharge is completed.

 <Description of the symbols for the main parts of the drawings>

10 lifting portion 11: compression spring

12: piston 20: discharge body portion

21: cylinder 22, 23: first and second bushing housing

24: valve base 25: retainer housing

26: end cover 27: valve guide

30: pneumatic valve 40: adhesive pressure feed unit

41 syringe 42: transfer pipe

43: syringe screw 50: discharge amount adjustment unit

100: dispensing valve unit 110: dotting nozzle

111: barrel 120: valve seat

130: air jet valve 131: air jet nozzle

132: air jet coupler 140: heater block

The present invention relates to a point application device, and more particularly, to provide a pneumatic guide wall by the air jet valve to suppress the generation of the tail of the adhesive discharged from the needle tip, the desired discharge without aggregation of the adhesive The present invention relates to a precise quantitative discharging type spot coating device which enables precise quantitative discharging in a direction.

The dispensing process is a process of receiving surface-mount parts from a parts supplyer and transferring them to a mounting position on a printed circuit board (PCB) by a surface mounter and applying an adhesive to a target position during mounting. Say.

This dispensing technology is driving new productivity gains in the surface mount market, and its pace of development is paced with high-speed chip shooters and mounters.

At present, the speed of the system reaches 65,000 parts per hour on the fastest lines, and the dispenser of the most advanced design can produce more than 140,000 dots per hour.

Most materials used in the Surface Mount Technology (SMT) process are epoxy-based surface mount adhesives and solder pastes, and pin transfer or stencil printing is common in the process.

The core technology in such dispensing is determined by the dispensing head, and the conventional dispensing head is configured to perform spot or line application through a nozzle equipped with a needle capable of fine point application (dotting).

In addition, in the dispensing method, the dispensing head is mounted on a robot unit that can move freely in the X-Y axis, respectively. Epoxy Dispensing by Repetitive Operation of Z-axis Lifting Epoxy (EP) is dispensed on the PCB substrate by dot coating.

However, in the conventional dispensing head and the dispensing method, as the dotting operation proceeds, the adhesive adheres to the end of the needle and rises up the outer wall of the needle, which makes it difficult to quantitatively discharge. There was a problem that the control was difficult due to the change of the amount at the end point.

In addition, the needle needs to repeat the Z-axis lifting motion in order to accurately apply the application position, which results in slow reaction rate and lower workability. Stable dotting is provided until waiting for the end of the fluidity of the epoxy. If the ascending movement for the next dotting is not finished at the end point, the tail (Tail), etc. were severely appeared, there was a problem that the quantitative discharge is difficult.

Accordingly, the present invention has been made to solve the above problems of the prior art, the object of the present invention is to provide an air jet valve to form a pneumatic guide wall by compressed air to generate the tail of the adhesive discharged from the needle end It is to provide a precise quantitative dispensing type point coating apparatus that can suppress the, and enable precise quantitative discharging in the desired discharge direction without aggregation of the adhesive.

In addition, another object of the present invention is to be seated in a certain position by the pneumatic guide wall by the compressed air injected from the air jet valve when the adhesive is discharged, the Z-axis lifting operation of the needle is unnecessary, the reaction speed is fast, workability The present invention provides an ascending and precise quantitative discharge point application device.

In addition, another object of the present invention is to discharge the quantitative dot ball in the form of a sphere at a precise position by the nozzle shape of the air jet valve, so that precise surface discharge can be carried out by precise control of the surface It is to provide a mold point coating device.

In addition, another object of the present invention is the precision jetting point application device that can be applied to the line by the continuous progress of the dotting operation, there is no change in the starting point and the end point because no adhesive aggregation of the needle end occurs by the air jet valve To provide.

Precision metering dispensing device according to the present invention for achieving the above object, the discharge body portion is installed various internal and external mounting; A lift part which is built in the discharge body part and opens and closes the clearance space for discharging the adhesive by vertical reciprocating motion; A pneumatic valve mounted on one side of the discharge body to control a vertical reciprocating motion of the elevating unit by power pneumatic; An adhesive pressure feeding part mounted on the other side of the discharge body part to convey an adhesive; a discharge amount adjusting part mounted on an upper part of the discharge body part to adjust the discharge amount of the adhesive by measuring the stroke number of the lifting part; And a dispensing valve unit mounted at a lower end of the discharge body unit to form a pneumatic guide wall by compressed air to dispense a fixed amount of adhesive.

At this time, the discharge body portion: a cylinder in which the lifting unit is sealed and the pneumatic valve is connected to one side mounted; First and second bushing housings respectively installed in upper and lower portions of the cylinder to induce a linear movement of the lifting portion; A valve base which is integrally coupled to the lower part of the cylinder and fixed to the dispensing valve part at a lower end thereof, and in which the adhesive pressure feeding part is connected to one side; And a retainer housing coupled to an upper end of the second bushing housing and coupled by the lifting unit and the retainer ring to maintain the sealing of the cylinder.

Preferably, the discharge body part further includes an end cover installed between the cylinder and the dispensing valve part to prevent cylinder contamination by an adhesive and to separate the dispensing valve part during washing.

On the other hand, the lifting unit: a piston for reciprocating up and down the inside of the cylinder; And a compression spring installed on the piston to provide downward elasticity.

The piston is preferably formed integrally with a split blade for separating the cylinder into the upper chamber and the lower chamber in the center, the opening and closing protrusion hole for opening and closing the clearance space at the bottom to control the adhesive discharge.

In addition, the pneumatic valve is characterized in that the five-port solenoid valve.

In addition, the adhesive conveying unit: a syringe in which a fixed amount of adhesive is stored and the adhesive transfer amount is controlled by compressed air; A transfer pipe communicating with one side of the valve base and transferring an adhesive from the syringe to the discharge body portion; And a syringe screw through which a communication hole through which an adhesive can flow is formed and which fixes the syringe to the transfer pipe.

The dispensing valve unit may include: a dotting nozzle installed at a lower end of the valve base and protruding with a needle for discharging a small amount of adhesive; A valve seat installed between the valve base and the dotting nozzle to prevent direct contact between the opening / closing hole at the bottom of the piston and the dotting nozzle; And a heater block coupled to a lower end of the dotting nozzle and forming a pneumatic guide wall by compressed air to precisely guide the discharged adhesive to surround the dispensing valve unit. desirable.

The air jet valve includes: an air jet nozzle which is integrally coupled to a lower end of the dotting nozzle, surrounds the needle and is spaced apart, and concentrates compressed air delivered by forming a plurality of through grooves on an outer surface thereof to form a pneumatic guide wall; ; It is preferable to include; air jet coupler to surround the air jet nozzle, supplying compressed air by the barrel is projected coupled to the outside.

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

1 is a front configuration cross-sectional view of the precise dose dispensing type dot coating device according to an embodiment of the present invention, Figure 2 to Figure 7 is a partial excerpt configuration diagram, Figure 2 is an excerpt configuration cross-sectional view of the piston, Figure 3 Figure 4 is an excerpt configuration diagram of the fencing valve portion, Figure 4 is an excerpt configuration sectional view of the dotting nozzle, Figure 5 is an excerpt configuration diagram of the air jet valve, Figure 6 is an excerpt configuration diagram of the air jet coupler, Figure 7 is a heater block It is a block diagram showing what was attached to the fencing valve part.

1 to 7, the precise dose dispensing device according to an embodiment of the present invention is largely, the discharge body 20, the lifting unit 10, the pneumatic valve 30, the adhesive pumping unit 40 ), The discharge amount adjusting unit 50, and the dispensing valve unit 100 is configured.

The discharge body portion 20 includes the elevating portion 10 and various internal and external attachments are installed, the cylinder 21, the first and second bushing housings 22 and 23, the valve base 24, And an end cover 26, a retainer housing 25, and a valve guide 27.

The cylinder 21 is a cylindrical structure in which a cylinder chamber is formed therein, and the lift unit 10 is hermetically sealed and the pneumatic valve 30 is connected to one side thereof, and the first bushing housing ( 22, a second bushing housing 23 is installed in the lower portion thereof, and first and second bushes 22a and 23a are inserted therein, respectively, to enclose the lifting portion 10 to induce its straight motion.

The valve base 24 is integrally coupled to the lower portion of the cylinder 21 so that the dispensing valve part 100 is fixed to the lower end and the adhesive pressure feeding part 40 is connected to one side thereof.

The end cover 26 is inserted between the cylinder 21 and the dispensing valve part 100 so that the adhesive rises along the lower shaft 12b of the elevating part 10 to contaminate the cylinder chamber. When the device is washed, the dispensing valve unit 100 is separated from the upper power unit including the cylinder 21 to increase the convenience of washing and to prevent the oil of the power unit from being leaked by the cleaning liquid.

The retainer housing 25 is coupled to the upper end of the second bushing housing 23 and coupled by the lifting unit 10 and the retainer ring (not shown) to maintain the closure of the cylinder 21. In this case, the retainer ring is preferably in the form of a bearing.

The valve guide 27 is integrally formed at one side of the cylinder 21 to serve as an adapter of the pneumatic valve 30 and the cylinder 21, and two pneumatic tubes are formed therein to form the cylinder 21. In the upper chamber and the lower chamber of the power supply will be provided respectively.

In addition, the lifting unit 10 opens and closes the clearance space for discharging the adhesive by vertical reciprocating motion, and comprises a piston 12, the compression spring (11).

The piston 12 is formed in the form of a cylindrical two-stage shaft, as shown in FIG. 2, the upper shaft 12a is hermetically embedded in the cylinder 21, and the lower shaft 12b is the valve base 24. Inlet is installed. In addition, the piston 12 is integrally formed with a split blade 12d for hermetically separating the cylinder 21 into an upper chamber and a lower chamber at the center of the upper shaft 12a, and is compressed at the upper portion of the split blade 12d. A spring holder 12c for fixing the spring 11 is formed, and an opening and closing protrusion 12g for opening and closing the clearance space is formed at the bottom of the lower shaft 12b to control the discharge of the adhesive, and the upper shaft 12a At the upper end, a pressurizing protrusion 12f is formed on the discharge amount adjusting unit 50 to provide an upward pressing force for measuring the number of strokes.

In the split wing 12d, a round groove 12e into which an O-ring (not shown) for airtightness is inserted is formed in a circular shape along the shape of the wing.

The opening and closing protrusion 12g is engaged with the opening and closing groove formed in the valve seat 120 installed in the upper portion of the dotting nozzle 110 by the vertical movement to form a clearance space, and tapered or hemispherical to smooth the engagement. It is preferable to form.

The compression spring 11 is fitted to the upper portion of the piston 12 is seated and fixed to the fixing table (12c), to provide a downward elasticity during the upward movement of the piston (12).

In addition, the pneumatic valve 30 is mounted on one side of the discharge body 20 via the valve guide 27 to control the vertical reciprocating movement of the lifting unit 10 by the power pneumatic. At this time, the pneumatic valve 30 is preferably a solenoid valve capable of exerting a regular and strong propulsion while the operation is precise, and more preferably a 5-port solenoid valve capable of producing a response speed having a short stroke at the highest possible speed. Do.

In addition, the adhesive pressure-feeding unit 40 is mounted on the other side of the discharge body 20 to perform the function of feeding the adhesive, including a syringe 41, a transfer pipe 42, a syringe screw 43 It is composed.

The syringe 41 is a container in which the adhesive is stored, and is preferably formed of a transparent material to check the remaining amount of the contents. The syringe 41 is controlled to allow the adhesive to flow at a predetermined flow rate by compressed air provided through an upper pneumatic port. . At this time, the internal pressure of the syringe 41 is sensitive to the discharge amount, so it is preferable to maintain a constant pressure, rather than consisting of a separate pressure control or an operation unit that can give a signal, the pressure is 2 ~ 4 kg / cm 2 is appropriate.

The transfer pipe 42 communicates with one side of the valve base 24 and transfers an adhesive from the syringe 41 to the discharge body 20, and serves as a base on which the syringe 41 is fixed. To perform.

The syringe screw 43 fixes the syringe 41 to the transfer pipe 42 and a communication hole 42a through which an adhesive flows is formed.

In addition, the discharge amount adjusting unit 50 is mounted on the upper part of the discharge body 20 to calculate the discharge amount by measuring the number of strokes of the pressurizing protrusion 12f on the upper end of the piston 12, the control unit is built in the stroke By adjusting the number, the adhesive discharge amount is controlled. The discharge amount adjusting unit 50 serves to easily adjust when the use of the device is changed, as well as the function of adjusting the appropriate amount of adhesive through the fine adjustment of the number of strokes.

In addition, the dispensing valve unit 100, as shown in Figure 3, is mounted on the lower end of the discharge body portion 20 to form a pneumatic guide wall by compressed air to dispense a precise amount of adhesive dispensing adhesive Performing, it comprises a dotting nozzle 110, the valve seat 120, the air jet valve 130, the heater block 140. In this case, the air jet valve 130 includes an air jet coupler 132 and an air jet nozzle 131.

3 and 4, the dotting nozzle 110 is integrally mounted to the bottom of the valve base 24 and the needle 111 for discharging a small amount of adhesive is protruded to the bottom.

The valve seat 120 is installed between the valve base 24 and the dotting nozzle 110 to prevent direct contact between the opening / closing protrusion 12g of the lower end of the piston 12 and the dotting nozzle 110. The opening and closing groove is formed in the center of the lower end to engage with the opening and closing protrusion hole 12g of the piston 12 to open and close the clearance space through which the adhesive can flow, and the shape of the opening and closing protrusion hole 12g is Similarly, it is preferable that it is tapered form or hemispherical form.

As shown in FIGS. 3 and 5, the air jet nozzle 131 is integrally coupled to the lower end of the dotting nozzle 110, surrounds the needle 111, and is spaced apart from each other. 131a is formed to concentrate the compressed air delivered by being distributed and pressed primarily in the separation space 133 formed between the air jet coupler 132 to form a pneumatic guide wall. The shape of the guide wall at this time becomes a cylindrical shape determined by the size of the needle 111.

As shown in FIGS. 3 and 6, the air jet coupler 132 surrounds the air jet nozzle 131 and supplies compressed air by a barrel 132a protrudingly coupled to the outside. As described above, the spaced air spaces 133 are formed between the air jet nozzles 131 and the compressed air is firstly distributed. At this time, the size of the air jet coupler 132 is preferably reduced in consideration of the obstacle of the target circuit board.

As shown in FIGS. 3 and 7, the heater block 140 surrounds the dispensing valve unit 100 and is integrally coupled to the heater block 140. The heater block 140 has an open shape at the protrusion of the barrel 132a. By heating the valve unit 100 to facilitate the discharge of the adhesive, and to maintain the same temperature state to perform the function to increase the precision of the discharge.

Figure 8 is a view showing the operation sequence of the precision quantitative discharging type dot coating apparatus according to an embodiment of the present invention, Figure 8a is a state in which the apparatus is moved to the discharge position and waiting, Figure 8b is injected compressed air for discharge 8C is a state in which the adhesive is started to be discharged, FIG. 8D is a state in which the adhesive is discharged and descends, and FIG. 8E is a state in which the discharged adhesive is seated at the bonding position and the discharge is completed.

In the state where the point application device of the present invention is moved to the discharge position and is waiting, as shown in FIG. 8A, the syringe 41 is always turned on so that an adhesive is waiting for supply through the transfer pipe, and the pneumatic valve ( 30 and both of the air jet valves 130 are turned off and are in the discharge atmosphere, and the piston 12 is in the lowered state.

Next, when the discharge preparation is ready, as shown in FIG. 8B, the air jet valve 130 is first turned on to supply external compressed air through the barrel 132a, and the supplied compressed air is supplied to the air jet nozzle. The pneumatic guide wall is confined in the separation space 133 between the 131 and the air jet coupler 132 and distributed and pressurized and concentrated through a plurality of through grooves formed in the outer wall of the air jet nozzle 131. To form. The pneumatic guide wall at this time is wrapped around the needle 111 and descends to have a cylindrical shape with a guide hole therein.

When the adhesive is discharged, as shown in FIG. 8C, the pneumatic valve 30 is turned on so that power pneumatic pressure is supplied to the lower chamber of the cylinder 21 through the lower pneumatic tube, and the piston 12 is driven up. As a result, the opening and closing groove in contact with the bottom is opened to form a clearance space through which the adhesive can flow.

As shown in FIG. 8D, the driven piston 12 is supplied with power pneumatic to the upper chamber of the cylinder 21 when the pneumatic valve 30 is turned off, and the force is applied to the downward elasticity of the compression spring 11. Putting it down again to close the opening and closing grooves instantly. At this time, the instantaneous adhesive is rapidly stopped in the needle 111 by the opening and closing operation of the piston 12 which is rapidly closed, and only the part exiting the needle 111 is ejected to form a fine adhesive ball, such a fine adhesive ball Is lowered along the constructed pneumatic guide wall.

When the microadhesive ball is seated in the targeted adhesive position, as shown in FIG. 8E, the air jet valve 130 is turned off to remove the pneumatic guide wall, and the device moves to the next target position.

On the other hand, the present invention has been described with reference to the embodiment shown in the drawings, but this is only exemplary, those skilled in the art will understand that various modifications and equivalent embodiments are possible from this. Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

As described above, according to the precision metered-out type spot coating apparatus according to the present invention, by providing an air jet valve to form a pneumatic guide wall by compressed air to suppress the generation of the tail of the adhesive discharged from the needle tip, There is an effect to enable precise quantitative discharge in the desired discharge direction without aggregation of the.

In addition, according to the present invention, because the pneumatic guide wall by the compressed air is injected from the air jet valve when the adhesive is discharged, it is seated in a certain position, the need for Z-axis lifting drive of the needle is unnecessary, the reaction speed is increased, the workability is increased There is.

In addition, according to the present invention, the nozzle shape of the air jet valve can discharge the quantitative dot ball to the correct position in the form of a sphere, thereby making it possible to perform precise surface mounting work by precise control.

In addition, according to the present invention there is no change in the starting point and the end point of the adhesive point because the adhesive does not occur at the end of the needle by the air jet valve, there is an effect that can be applied to the line by the continuous progress of the dotting operation.

Claims (10)

A discharge body part 20 on which various internal and external mountings are installed; Lifting unit 10 is built in the discharge body portion for opening and closing the clearance space for discharging the adhesive by the vertical reciprocating motion; A pneumatic valve (30) mounted on one side of the discharge body (20) to control the vertical reciprocating motion of the elevating unit (10) by power pneumatics; An adhesive feeding unit 40 mounted on the other side of the discharge body 20 to feed the adhesive; A discharge amount adjusting unit (50) mounted on an upper portion of the discharge body unit (20) to measure the stroke number of the lifting unit (10) to adjust the adhesive discharge amount; And And a dispensing valve part 100 mounted on the lower end of the discharging body part 20 to form a pneumatic guide wall by compressed air to dispense a fixed amount of adhesive. Device. The method of claim 1; The discharge body 20 is: A cylinder (21) in which the lifting unit (10) is sealed and built-in, and the pneumatic valve (30) is communicated with and installed at one side; First and second bushing housings 22 and 23 which are respectively installed in upper and lower portions of the cylinder 21 to induce a straight movement of the lifting unit 10; A valve base 24 which is integrally coupled to the lower portion of the cylinder 21 to fix the dispensing valve part 100 to a lower end thereof, and to which the adhesive pressure feeding part 40 communicates with one side; And And a retainer housing 25 coupled to an upper end of the second bushing housing 23 and coupled by the lifting unit 10 and a retainer ring to maintain the tightness of the cylinder 21. Precision metered discharge point application device. The method of claim 2, The discharge body 20 is inserted between the cylinder 21 and the dispensing valve unit 100 to prevent the contamination of the cylinder 21 by the adhesive and to separate the dispensing valve unit 100 during cleaning. Precision metered dispensing point application device further comprises an end cover (26). The method of claim 1, wherein the lifting unit 10 is: A piston 12 which vertically reciprocates the inside of the cylinder 21; A precision quantitative discharging point coating device, comprising: a compression spring (11) installed above the piston (12) to provide downward elasticity. The method of claim 4, wherein The piston 12 is formed integrally with a split wing 12d for sealing the cylinder 21 in the upper chamber and the lower chamber in the center, the opening and closing protrusion (12g) for opening and closing the clearance space to control the adhesive discharge at the bottom ) Is formed a precise quantitative discharging type point coating device. The method of claim 1, The pneumatic valve 30 is a precision metered discharge point coating device, characterized in that the five-port solenoid valve. The method of claim 1, wherein the adhesive sending portion 40 is: Syringe 41 in which a fixed amount of adhesive is stored and the adhesive transfer amount is controlled by the compressed air; A conveying pipe 42 installed in communication with one side of the valve base 24 and transferring an adhesive from the syringe 41 to the discharge body 20; And A communication hole through which an adhesive flows is formed therein, and includes a syringe screw (43) for fixing the syringe (41) to the transfer pipe (42). The method of claim 1, wherein the dispensing valve unit 100 is: A dotting nozzle 110 installed at a lower end of the valve base 24 and protruding with a needle 111 for discharging a small amount of adhesive; A valve seat 120 installed between the valve base 24 and the dotting nozzle 110 to prevent direct contact between the opening / closing protrusion 12g of the lower end of the piston 12 and the dotting nozzle 110; And And an air jet valve (130) coupled to the lower end of the dotting nozzle (110) to precisely guide the discharged adhesive by forming a pneumatic guide wall by compressed air. The air jet valve 130 of claim 8, wherein: The air is integrally coupled to the lower end of the dotting nozzle 110, the needle 111 is spaced apart and wrapped, and a plurality of through holes 131a are formed on the outer surface to concentrate the compressed air delivered to form a pneumatic guide wall. Jet nozzle 131; Wrapping the air jet nozzle 131 spaced apart, the air jet coupler 132 for supplying compressed air by the barrel (132a) protrudingly coupled to the outside; The method according to claim 8 or 9, The dispensing valve unit 100 is a precise metered discharge type coating device characterized in that it further comprises a heater block 140 for wrapping and dispensing the dispensing valve unit (100).

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