JPH0733907Y2 - Dispenser for small amount of liquid discharge - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement of a dispenser for small amount liquid discharge.

[Conventional technology]

Recently, with the advancement of high-tech, the demand for small amount discharge of liquids has increased rapidly. One example is liquid drip coating for a barrier used for wiring printing on a printed circuit board. A liquid micro-dispenser, a so-called dispenser, is used for these operations. Of these, the most recently used is the use of a syringe (Syringe) that is already filled with a liquid and is commercially available.
A side sectional view of the syringe-type dispenser is shown in FIG. The main body of the syringe is a plastic cylindrical type, and a screw is attached to the lower part, that is, the tip part so that the nozzle (56) can be attached, and the terminal part above it is for a semi-rotating connection type quick pipe connector. Jaw (Sj) is attached. Further, a jaw (51j) which is a partner of the jaw (Sj) on the syringe is attached to the connecting portion of the gun body (51) to which the syringe (S) is attached. The connection method is each jaw (Sj, 51j)
The half cutouts are passed, the jaws are inserted in the horizontal direction of the shaft, and half rotations are made to engage the jaws, and the jaws are connected and fixed.

[Problems to be solved]

See FIG. The syringe (S) fixed by the coupling as described above is already filled with a required amount of liquid, and the gun body (5) is placed on the liquid surface (Lf).
1) Apply air pressure (P) through the air passage inside. The liquid is closed by pressure contact between the seat (valve seat) under the syringe (S) and the needle valve (57) provided at the axis of the syringe, that is, by closing the valve, but on the gun body (51). When the valve is opened by the operation of the solenoid (65) of, the liquid passes through the valve section and the nozzle (56)
Is discharged to the outside. By performing this intermittently, a very small amount of liquid is ejected. The amount of the minute amount of discharge is generally required to have an accuracy of mg unit.

Although air pressure is applied to the syringe (S) as described above, the length (ls) of the syringe is extended by increasing the applied pressure (P). However, the length (lb) of the needle valve (57) is fixed. Therefore, the gap (C) between them opens and fluctuates. In other words, the discharge amount increases with the pressurization amount of air,
The ejection rate is higher than the rate of increase. In addition, the length (ls) of the syringe (S) and the center position of the nozzle (56) hole may change due to dimensional error depending on the manufacturer of the syringe (S). This caused various inconveniences in work such as displacement of the position. Furthermore, when the syringe ruptured, the liquid inside the syringe was scattered, which was dangerous.

As described above, the minute amount of discharge must be precise, and these fluctuations have caused a considerable hindrance to the product to be coated.

[Means for solving problems]

The object of the present invention is to prevent the variation of the gap between the needle valve and the seat due to the extension of the syringe caused by the air pressure applied to the inside of the container such as the syringe,
An object of the present invention is to provide a dispenser that maintains the liquid discharge amount and the discharge position by opening and closing the valve with high accuracy and constant, while keeping the gap constant.

Next, the configuration of the present invention will be described. See FIG. First, it is assumed that the object to be handled used in this device is a liquid-filled container (T) that is a ready-made product, that is, a commercially available product, and there are various shapes. A screw to which a nozzle seat (valve seat) is attached is cut at the (tip portion), and the other end is simply a tube opening.

The structure of this device will be described. First, there is a gun body (1), and a valve rod (7) is housed in a hole vertically penetrating the body, and a solenoid device is provided at an upper portion thereof as a valve opening / closing actuator. It is directly connected to the iron core (18) of (15). Although a solenoid device is shown as the valve opening / closing device in the drawings, an air cylinder type may be used. An air sealing (13) for the valve rod (7) is provided on the solenoid device side of the valve rod through hole (8) in the gun body (1).
A pressurized air supply port (11) connected to the outside is opened below the ceiling, and a void or a vertical groove, that is, a pressurized air passage (12) communicating with the opening is provided in the valve rod (7).
Are provided concentrically or in the same direction. Further, below the central axis of the gun body (1), a centering shaft (10) for mounting the cylindrical liquid filling container (T) is attached by a screw, and the valve rod of the valve rod is also coaxially mounted on the central axis. A pressurized air passage (12) concentrically provided in the through hole (8) communicates with the gun body (1) and opens at the lower surface of the centering shaft. The lower end of the valve rod (7) is a needle valve (7b). The valve seat (5) corresponding to the needle valve (7b) is housed and fixed in the retainer (4), and the hole below the seat is the nozzle hole (9) attached to the retainer (4). Communicated. The screw at the tip of the cylindrical liquid filling container (T) is also fixed on the retainer (4). Further, the retainer (4) is fixed to the gun body (1) by a retainer fitting (3) via an outer cylinder (2) by screw fitting or the like. However, the outer cylinder (2) and the retainer fitting (3) may be integrated. Further, the screw in the screw fitting may be a double or triple screw to reduce the number of rotations.
Further, the centering shaft (2fs, 2fs ₁ ) and its corresponding part are connected to the connection part with the gun body (1) above the outer cylinder (2) and the connection part with the retainer fitting (3) below the outer cylinder, respectively. Holes (1fh, 3fh) are provided.

As described above, in the dispenser of the present invention, the pressurized air supply port (11) is connected to the pressurized air tank (19) through the automatic pressure adjusting valve (14), the flow rate adjusting valve (16), etc., and the solenoid device ( The 15) is electrically connected to the timer (20) or the pulse controller as in the conventional case.

[Action]

See also Figure 1. First, the air having the required pressure is supplied to the pressurized air supply port (11) in the dispenser.
To a cylindrical liquid-filled container (hereinafter, abbreviated as a cylindrical container) through a pressurized air passage (12) around the outside of the valve rod.
It enters the upper part of (T) and pressurizes the liquid surface previously filled in the container. The container expands vertically or expands concentrically in proportion to the applied pressure. The increase in the gap caused by the concentric bulge is prevented by the O-ring (105) on the centering shaft (10). Regarding the elongation in the longitudinal direction, first, the tip of the cylindrical container (T) is fixed by press contact with the surface of the valve seat (5). The seat (5) is fixed to the retainer (4), the outer cylinder (2), and the gun body (1). Therefore, the position of the needle valve (7b) at the tip of the valve rod (7) fixed to the iron core (18) in the solenoid device (15) fixed to the body is also fixed as a result. It has been done. That is, if the air pressure entering the cylindrical container (T) is increased, the entire length (ls) of the container will be extended in the vertical direction (“U”) as in the conventional case (see FIG. 4). According to the dispenser of the present invention, the length (Lb) between the base of the valve rod (7) and the valve seat (5) and the total length (Ls) of the container are both fixed. Therefore, the air pressure applied to the cylindrical container (T) does not change the gap between the needle valve (7b) and the valve seat (5). The gun body (1) and outer cylinder (2)
The number of rotations can be reduced by making the connecting screw with the multiple type, that is, the time for mounting them can be shortened.

The tip (nozzle side) and upper part (opening) of the cylindrical container (T) are each part of the apparatus, that is, the centering shaft (10), other gun body (1), and outer cylinder (2). The center position of the nozzle hole (9) is also fixed by the connecting portion of the above and the centering portion such as the outer cylinder and the retainer fitting (3) and the seat storage portion inside the retainer (4).
Therefore, the accuracy of the ejection amount and the ejection position is maintained. Further, even if the cylindrical container (T) bursts, it is possible to prevent the liquid inside from scattering.

〔Example〕

First Embodiment In the above description, the liquid-filled container, which is a commercially available product, has a cylindrical shape and has a nozzle mounting screw at one end. However, in this example, a syringe type that is generally used in the past is used. It is intended for the container (S) (see FIG. 2). However, in the opening of the same type container (S), there is a jaw (Sj) protruding in two directions for a quick pipe connector.
Since the connection and fixing of 1) and the container (S) are performed in the valve seat portion, the jaw (Sj) is not used. Therefore, the space inside the outer cylinder (22) needs to be wide so that the jaws (Sj) do not interfere with each other.

Second Embodiment In this embodiment, as shown in FIG. 3, the outer cylinder (32) and the gun body (31) are connected by a quick pipe connector type. That is, the jaw (31j) is attached to the gun body (31) side,
And the corresponding jaw (32j) on the outer cylinder (32) side
Is provided. The centering between the gun body (31) and the outer cylinder (32) in the quick pipe connector type is provided on the upper part of the outer cylinder (32) at the final position of the connecting half-rotation, and on the gun body. This can be done by mounting the ball-type lock fittings (35, 35C, 36) with springs on the Franci (34) surface, which has almost the same outer diameter as the jaw (31j). Further, a mounting plate (41) may be provided on the gun body (31) or the outer cylinder (32) and mounted on the arm of a robot which is a related device. By doing so, the ejection position does not change when the liquid filling container (T or S) is replaced.

〔effect〕

According to the dispenser for small amount of liquid discharge according to the present invention, even if the pressurized air is supplied to the commercially available syringe mounted in the dispenser, the liquid discharge amount fluctuation caused by the extension of the syringe due to the air pressure as in the conventional case is prevented. Without inviting
That is, it is possible to always perform precise and constant minute amount discharge without being influenced by any condition of the air pressurization.

Another advantage is that it does not lead to errors in the minute discharge position due to product errors such as syringes, and it can also accurately hold the position on the center line of the nozzle attached to the tip of the syringe, so that liquid can be placed at precise positions. A small amount can be applied.

[Brief description of drawings]

FIG. 1 is a side sectional view of a dispenser for dispensing a small amount of liquid according to the structure of the present invention. FIG. 2 is a side sectional view of a lower part of the dispenser when the syringe type container in the first embodiment is mounted.
FIG. 4 is a side sectional view of a connecting portion by a quick pipe connector in the second embodiment. FIG. 4 is a side sectional view of a dispenser in which only a conventional syringe is attached to a gun body. Description of main symbols 1,21,31 ... Gun body , 2,22,32 …… Outer cylinder, 3,23 …… Retainer fitting, 4,24 …… Retainer, 5,25 …… Valve seat, 6,26 …… Nozzle, 7 …… Valve rod, T… … Cylindrical liquid filling container, S… Syringe type container, 35, 35C, 36…
... Ball type lock fittings with spring

Claims (6)

[Scope of utility model registration request] 1. A valve opening / closing device (15) is attached to the upper part of the gun body (1) in the vertical direction, and a valve rod (7) directly connected to the device is installed inside the gun body (1). Installed by penetrating and extending downward. B. Pressurized air supply port (11) on the side of the gun body (1).
Is provided, and the supply port (11) has the valve rod (7).
Communicating with a space provided concentrically with the through hole (8) or a vertical groove or a pressurized air passage (12) provided in the same direction as the through hole (8), and c. In the lower part of the body (1), a centering shaft (10) for inserting the cylindrical liquid filling container (T) is provided concentrically with the through hole (8), and d. The outer cylinder (2) is connected to the lower outer edge (1B) of 1) by screws or the like, and e. The retainer (4) is provided at the lower part of the outer cylinder (2). A screw is provided on the central axis and is connected to the cylindrical liquid filling container (T) described in the above item c. The lower end surface of the cylindrical liquid filling container (T) is a valve seat (5). And a nozzle (6) attached to the lower portion of the valve seat (5) Liquid trace discharge dispenser characterized. 2. The dispenser for micro-volume liquid discharge according to claim 1, wherein the cylindrical liquid filling container is a syringe type container (S). 3. A dispenser for micro-volume liquid discharge according to claim 1, wherein the screw in the screw type connection between the gun body (1) and the upper part of the outer cylinder (2) is a multiple type screw. 4. A screw type connection between the gun body and the upper part of the outer cylinder is provided.
The dispenser for discharging a small amount of liquid according to claim 1, wherein the utility model registration is a quick pipe connector type connection. 5. A ball type lock with a spring between a lower surface of a connector jaw (31j) on a gun body (31) of a quick pipe connector type and an upper surface of a flange (34) provided on an outer cylinder (32). The dispenser for discharging a small amount of liquid according to claim 4, wherein the metal fittings (35, 35c, 36) are provided. 6. A gun body (1 or 21, 31) or an outer cylinder (2)
Or, 22, 32) for mounting a small amount of liquid according to claim 1 in which a mounting plate (41) is provided and fixed to the arm of a robot which is a related device through the plate. Dispenser.