JP2001293398A - Nozzle device and method of filling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nozzle device capable of preventing a filling material from adhering on a valve element or a tip end part of a valve seat or allowing only the reduced amount of adhesion as compared with a conventional device even if the material should adhere. SOLUTION: The nozzle device comprises a nozzle outer tube 1 having a hollow part penetrating in an axial direction and having the valve seat 1a formed at one end and a valve comprising a valve stem 2 and a valve element 2a formed on one end of the valve stem 2 and capable of moving upwards and downwards in the hollow part of the nozzle outer tube 1. The amount of the filling material is regulated by controlling a clearance of the valve element 2a with respect to the valve seat 1a. The contact faces of the valve element 2a and the valve seat 1a form a conical face and both tip parts of the valve element 2a and the valve seat 1a have acute angles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle device for filling a liquid or sol product and a filling method using the same. In particular, a nozzle that can be filled without causing dripping or stringing of a high-viscosity filler such as ink without causing dripping and stringing of a low-viscosity liquid filling such as a resin. It concerns the device.

[0002]

2. Description of the Related Art As an example of a nozzle device for filling a highly viscous product, JP-A-7-285518 and JP-A-10-108 have been disclosed.
An apparatus disclosed in 175616 is known.
The nozzle device disclosed in Japanese Patent Application Laid-Open No. 7-285518 includes a cylindrical nozzle outer cylinder, and a valve stem having a conical valve body provided at the tip while moving up and down a hollow portion of the nozzle outer cylinder. Basically configured. This nozzle device is in a closed state when the conical valve body and the tip valve seat of the nozzle outer cylinder come into contact with each other, and prevents the outflow of the filler. Further, an air blow hole is formed through the valve stem and the valve body for air blow, and air blow is performed through the air hole to drop the filler adhering to the tip of the cylindrical nozzle and the valve body. Is disclosed. Further, a filling nozzle device disclosed in Japanese Patent Application Laid-Open No. 10-175616 discloses a cylindrical nozzle outer cylinder portion, a valve stem which moves in the hollow portion of the outer cylinder portion in the axial direction and provides a valve seat at a lower end, And a packing attached to a portion that comes into contact with the lower end of the nozzle outer cylinder when the valve is closed. Further, it is disclosed that the valve seat is provided with a drip-preventing mechanism for a downwardly facing convex-shaped filling material.

As an example of a nozzle device for filling a low-viscosity product, an apparatus disclosed in Japanese Patent Application Laid-Open No. 9-278017 is known. As shown in FIGS. 10 (a) and 10 (b), the nozzle device disclosed in Japanese Patent Application Laid-Open No. 9-278017 raises and lowers a nozzle outer cylinder 1 and a hollow portion of the nozzle outer cylinder 1 and, at the tip, It is basically composed of a valve stem 2 provided with a valve element 2a. This nozzle outer cylinder 1
The upper part is a large-diameter nozzle portion 1c, and the lower part is a small-diameter nozzle portion 1b.
The diameter is conically reduced from the large diameter portion to the small diameter portion. A valve seat 1a is provided at the lower end where the nozzle large diameter portion 1c is conically reduced in diameter to abut on the valve body 2a when the valve is closed. The nozzle small-diameter portion 1b located below the valve seat 1a has a smaller-diameter outer cylindrical shape than the nozzle large-diameter portion 1c so that it can be inserted into a filling port of a filling container. The valve element 2a provided at the tip has a structure in which a tip 2d having an outer diameter smaller than the inner diameter of the nozzle small diameter portion 1b is provided at the tip.

[0004]

It is desirable for a filling nozzle apparatus that when the nozzle is closed, the filling material drop at that time without any attachment to the valve seat or valve body.
This is because the adhered filling material later drops, that is, causes dripping or stringing, and adheres to and contaminates the filling container or the surroundings. According to the study of the present inventor, the devices disclosed in the above-mentioned JP-A-7-285518 and JP-A-10-175616 are:
It was noted that dripping and stringing had a certain effect. However, also in the nozzle device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-285518, a phenomenon that the filler adheres between the outer ring of the valve seat and the lower end of the nozzle when the nozzle device is closed was confirmed. This adhesion is not eliminated even if air is blown from the vent hole, and the adhesion accumulates when the nozzle is repeatedly opened and closed, and when the accumulated amount exceeds a certain value, the adhered filler drips. During this time, a stringing phenomenon occurred depending on the properties of the filler. After examining the cause, since the external dimensions of the valve body were larger than the external dimensions of the cylindrical nozzle,
It has been confirmed that even if air blowing is performed, the filler adhering to the outer edge of the valve body does not reach the air blowing. Further, the device disclosed in Japanese Patent Application Laid-Open No. H10-175616 is based on the premise that a filler is attached to and held by a liquid dripping prevention mechanism in the first place, and is not a device intended to surely cut the filler. . That is, in the conventional nozzle device, the filler does not surely break, and the filler adheres to the valve body or the valve seat. It is conceivable to provide a device having a structure that does not contaminate the filling container and the surroundings by providing a sliding tray between the filling container and the dripping of the attached filler and stringing. Operation time is required, which increases the tact time of the filling process and reduces productivity.

According to the study of the present inventors, it has been confirmed that the apparatus disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-278017 has a certain effect in preventing the liquid from dripping of the filler. However, also in the apparatus disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-278017, the dripping phenomenon of the filling liquid was confirmed. FIG. 10 is an enlarged view of the tip of this device, and FIG.
0 (a) shows a state in which the nozzle is closed, FIG. 10 (b)
FIG. 4 is a view showing a state where a nozzle is opened. As shown in FIG. 10 (a), the device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-278017 has a
The plug is sealed at the tip of the valve 2a. Although the stopper 2d guides the vertical movement of the valve stem 2, the outer diameter of the stopper 2d is relatively smaller than the inner diameter of the nozzle small diameter portion 1b in order to smoothly move the valve up and down. Has become. That is, a gap is formed between the inner diameter of the nozzle small-diameter portion 1b and the outer diameter of the plug 2d. When the nozzle device was closed, it was confirmed that the filling liquid accumulated in the gap was pushed out and dripping occurred. Further, since the lower portion of the plug 2d is a flat surface, it is confirmed that the filling liquid attached to the plug 2d is dropped after the filling is completed before closing the nozzle device, and the mouth of the filling container is stained. Was. Accordingly, an object of the present invention is to provide a nozzle device that can prevent the filler from adhering to the valve body or the valve seat tip portion, or can reduce the amount of adhesion as compared with the conventional nozzle device even if it adheres. And

[0006]

In order to solve the above-mentioned problems, the inventor of the present invention has used various types of valve seats and valve body nozzle devices as shown in FIG. I checked the situation. In the specification of the present application, a material having a viscosity in the range of 10 to 4,000 mPa · s is called a low viscosity material, and a material having a viscosity of 4,000 mPa · s or more is called a high viscosity material. In FIG. 5, the nozzle devices (a) to (f) each include a nozzle outer cylinder 1 having a valve seat 1 a at a tip and a valve stem 2 which can move up and down a hollow portion of the nozzle outer cylinder 1.
And a valve element 2a provided at the end of the valve. FIG.
(F) shows a state in which the nozzle is closed, but the state of ink adhesion was checked after repeating opening and closing of the nozzle. 5 (b) to 5 (f), a gas supply hole 2b penetrating through the valve rod 2 and the valve body 2a is formed, and the gas can be blown from the gas supply hole 2b. The adhesion status was checked after gas blowing. In addition, gas blowing was performed using air.

[0007] The oblique lines are given to the portions where the ink has adhered, and it can be seen that the amount of ink adhered decreases in the order of FIGS. 5 (a) to 5 (f). In the nozzle device shown in FIGS. 5A and 5B, the lower end surface of the valve seat 1a and the lower end surface of the valve body 2a both form a horizontal plane, and when the nozzle apparatus is closed, both horizontal planes are continuously large. Is formed. Since the amount of ink adhesion can be said to be proportional to the area on which ink can be applied, FIG.
In the nozzle devices of (a) and (b), the ink adhesion amount is increased by that much as compared with the nozzle devices of FIGS. 5 (c) to 5 (e). In the nozzle device of FIG. 5B, gas is blown, but ink remains on the inner peripheral surface of the gas supply hole 2b of the valve body 2a due to the viscosity of the ink attached to the lower end surface of the valve body 2a. It is presumed to have adhered. In the nozzle device of FIG. 5C, the area of the lower end surface of the valve body 2a is smaller than that of the nozzle device of FIGS. 5A and 5B, so that the ink adhesion amount is small. However, valve body 2
The method has not been developed to prevent the ink from adhering to the inner peripheral surface of a.

In the nozzle device shown in FIG. 5D, the lower end of the valve seat 1a and the lower end of the valve body 2a are both sharp at an acute angle and have no horizontal plane. Therefore, the ink adhesion amount is shown in FIG.
It is considerably reduced as compared with the nozzle devices of (a) to (c). The nozzle device of FIG. 5D shows a state in which the nozzle is closed, and in this state, the tip of the valve body 2a protrudes from the tip of the valve seat 1a. Therefore, ink adhered to the outer peripheral surface of the valve body 2a, and this ink could not be dropped even by gas blowing. In the nozzle device of FIG. 5E, no ink adhesion was observed. In the nozzle device shown in FIG. 5 (e), the tip of the valve seat 1a and the tip of the valve body 2a are both sharp at an acute angle, and the tips coincide when closed. No ink adhesion was observed in the nozzle device of FIG. In the nozzle device shown in FIG. 5F, the tip of the valve seat 1a and the tip of the valve body 2a are both sharp at an acute angle, and when the valve seat 1a is closed, the tip of the valve body 2a is closed.
a protrudes from the front end of a. That is, in the nozzle device of FIG. 5F, the positional relationship between the tip of the valve seat 1a and the tip of the valve body 2a is opposite to that of the nozzle device of FIG. 5D. The reason why ink was not observed in the nozzle device of FIG. 5F was that although there was an element to which ink adhered to the inner peripheral portion of the tip of the valve seat 1a, gas blowing effectively acted on the portion. Inferred.

Next, using a urethane resin composition as a low-viscosity filler, the adhesion of the valve seats 1a and valve bodies 2a of various shapes shown in FIG. Urethane and isocyanate-based resin compositions have a property of being easily cured and deteriorated by moisture and a property of being easily oxidized and deteriorated. Therefore, gas blowing was performed using nitrogen gas, which is a kind of inert gas, instead of air. Since industrially purified nitrogen gas has an extremely low moisture content,
It is effective for measures against moisture hardening or oxidative deterioration. The experiment was performed under the same conditions as in the case of the above-described ink, except that nitrogen gas was used for gas blowing. As a result, as in the case of the ink, even when the urethane resin composition was used as the filler, no adhesion of the filler was observed in the nozzle devices of FIGS. 5 (e) and 5 (f).

The results of experiments using the nozzle devices shown in FIGS. 5A to 5F are summarized as follows. If there is a horizontal plane at the tip of the valve body 2a and the valve seat 1a, the adhesion of the filler becomes remarkable. When the distal ends of the valve body 2a and the valve seat 1a are sharply pointed, the amount of the filler adhering can be reduced. In the case where the valve body 2a and the valve seat 1a have sharp tips, the filler attachment reduction effect can be further improved by matching the tips. When the distal end of the valve seat 1a protrudes from the distal end of the valve body 2a in the closed state, the effect of gas blowing is exhibited, which is effective in preventing the adhesion of the filler.

The present invention is based on the above findings,
A valve having a hollow portion penetrating in the axial direction and having a valve seat formed at one end, a valve rod and a valve body provided at one end of the valve rod, and a valve that moves up and down the hollow portion of the nozzle outer cylinder. A nozzle device that adjusts the flow rate of the filler by adjusting the gap of the valve body with respect to the valve seat, wherein a contact surface between the valve seat and the valve body forms a conical surface. The nozzle device is characterized in that both the tip of the valve seat and the tip of the valve element form an acute angle.

In the present invention, when the nozzle device is in a fully closed state, the tip of the valve seat coincides with the tip of the valve body, or the tip of the valve seat is closer than the tip of the valve body. It is desirable that they protrude. By adopting such a structure, it is possible to eliminate the adhesion of the filling material as compared with the conventional nozzle device, or to extremely reduce the amount of the adhesion even if there is. Further, in the present invention, it is preferable that a gas supply hole penetrating the valve stem and the valve element be formed in the valve. By performing gas blowing through the gas supply holes, adhesion of the filler can be further reduced. Further, in the present invention, the support member further includes a support member that supports the valve stem while slidingly contacting the valve stem, and an elastic sealing member that covers the support member to prevent contact between the support member and the filler. It is desirable to provide a hole for pressure relief in the hole. This is to prevent the pressure from being generated in the sealing member as the valve stem moves up and down, whereby the pressure can be prevented from being applied to the sealing member and the life can be extended. Furthermore, in the present invention,
It is effective to make the contact portion of the valve body with the filler a curved surface. By doing so, it is possible to prevent the flow of the filling material from becoming turbulent by reducing the resistance of the filling material when opening and closing the nozzle. Further, in the present invention, both the distal end of the valve seat and the distal end of the valve body are 25 ° or more.
Make an angle of 60 °, and the sum of both angles is 50 ° -12
Desirably, it is 0 °. In this range, the adhesion of the filler can be further reduced. It is more preferable that both the tip of the valve seat and the tip of the valve element form an angle of 30 ° to 45 °, and the sum of both angles is 60 ° to 90 °. Further, the present invention comprises a nozzle outer cylinder having a hollow portion penetrating in the axial direction and having a valve seat at one end, a valve stem and a valve element provided at one end of the valve stem, and the nozzle outer cylinder has a hollow. Using a nozzle device that adjusts the gap of the valve body with respect to the valve seat to adjust the flow rate of the filling material. Wherein the abutment surface between the valve seat and the valve body forms a conical surface, and both the tip of the valve seat and the tip of the valve body form an acute angle. And filling the filling material from the nozzle device while supplying gas to the filling port of the container. According to this method, since the filler falls along with the gas flow, the falling flow of the filler can be improved, and the adhesion of the filler can be further reduced. Furthermore, in the present invention, when the filler is a moisture-curable compound such as a urethane-based resin composition and an isocyanate-based resin composition,
It is effective to use an inert gas as the gas.
Thus, the moisture-curable compound can be filled while preventing deterioration of the moisture-curable compound due to a chemical reaction with moisture in the air.
It is desirable that the gas is supplied through the gas supply hole that can be provided in the nozzle device of the present invention.
In this case, since the filler falls around the gas flow supplied from the gas supply hole, it is particularly effective for improving the falling flowability of the filler.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the nozzle device of the present invention will be described below with reference to the drawings. <First Embodiment> FIG. 1 is a view showing a nozzle device according to a first embodiment, showing a state in which a nozzle is opened.
FIG. 3 is an enlarged view of a tip portion of the nozzle device according to the first embodiment, showing a state in which the nozzle is closed. FIG. 3 is a cross-sectional view of the nozzle device according to the first embodiment, and FIG. 4 is a diagram illustrating a filling device including the nozzle device according to the first embodiment.

In FIG. 4, a is a nozzle device according to the first embodiment, b is a filling container for storing the filling material discharged from the nozzle device a, c is a conveyor for conveying the filling container b, and d is a conveyor c. , A feed pipe, f is a pump, g is a motor, h is a storage tank for storing the filling, and i is a filling sensor. The filling material stored in the storage tank h is sucked up by the action of the pump f driven by the motor g and supplied to the nozzle device a through the supply pipe e. The filling material supplied to the nozzle device a is discharged toward the filling container b transported by the conveyor c. The nozzle device a is opened by detecting that the filling container b has reached the lower portion of the filling nozzle by the conveyor c by a separately provided sensor (not shown), and the weighing device d detects a predetermined filling amount. It is supposed to close. The level of the filling in the storage tank h is detected by the filling sensor i, and the amount of the filling in the storage tank h is maintained by successively refilling the filling.

The details of the nozzle device a according to the first embodiment will be described with reference to FIGS. The upper end of the nozzle outer cylinder 1 is fixed to a box-shaped safety cover 5, while a valve seat 1a is formed at the tip of the lower end. The valve seat 1a
The contact surface with the valve element 2a described later forms a conical surface.
The nozzle outer cylinder 1 is connected to the supply pipe e via a connection pipe 4, and the hollow portion of the nozzle outer cylinder 1 communicates with the supply pipe e and the hollow part of the connection pipe 4. Accordingly, the filler fed by the pump f is supplied into the nozzle outer cylinder 1 through the supply pipe e and the connection pipe 4. Since the nozzle outer cylinder 1 has a structure that can be divided by the ferrule clamp 1d, the internal cleaning is easy. In addition, according to the ferrule clamp 1d, not only the attachment and detachment is easy, but also the axial center alignment with the valve stem 2 described later is easy, which contributes to the easiness of the maintenance work including the sealing property.

In the hollow portion of the nozzle outer cylinder 1, a valve stem 2 having a valve body 2a at the tip is disposed. The upper end of the valve stem 2 is connected to the rod 3 a of the air cylinder 3, and moves up and down in the hollow portion of the nozzle outer cylinder 1 by the operation of the air cylinder 3. The contact surface of the valve body 2a with the valve seat 1a forms a conical surface, and the nozzle device a closes and separates due to the contact between the conical surface of the valve seat 1a and the conical surface of the valve body 2a. Then, the nozzle device a is opened. Valve stem 2
A cylindrical shaft holder 6 is arranged on the outer periphery of the shaft holder 6. The shaft holder 6 has an upper end fixed to the safety cover 5 and an oilless bearing 6a as a slide bearing at the upper and lower ends. Therefore, the valve stem 2 moves up and down while sliding with the oilless bearing 6 a of the shaft holder 6 in accordance with the operation of the air cylinder 3. Further, the filling material is the valve stem 2 and the shaft holder 6.
A bellows 7 that covers the shaft holder 6 and the valve stem 2 is disposed in order to prevent the sliding portion from entering the sliding portion.
The upper end of the bellows 7 is sealed to the outer periphery of the shaft holder 6, and the lower end is sealed to the outer periphery of the valve stem 2 by a bellows fixing tool 7 a. The bellows fixing member 7a is provided with an O-ring 7b to ensure a more sealed state inside. The bellows 7, which is a sealing member, is often made of metal.

Since the upper and lower ends of the bellows 7 are sealed by the bellows fixing member 7a, the inside thereof is sealed. Therefore, as it is, the valve rod 2 moves up and down, so that the air inside the bellows 7 is compressed, and unnecessary pressure is applied to the bellows 7. In order to avoid this unnecessary pressure load, the pressure relief holes 6 shown in FIG.
b penetrates from the lower end to the upper end of the shaft holder 6. Therefore, the life of the bellows 7 can be extended. The valve rod 2 and the valve body 2a are formed with gas supply holes 2b penetrating both. A gas inlet 2c is provided at the upper end of the valve stem 2, and air is introduced at a necessary timing from the gas inlet 2c to prevent the filler from adhering to the tip when the nozzle device a is closed. Play an auxiliary role.

The nozzle device a according to the first embodiment is also characterized in that the lower bellows fixing member 7a, the inner periphery of the valve seat 1a and the outer periphery of the valve body 2a have a curved surface without irregularities. This is for the following reason. That is, before and after the opening and closing of the nozzle, the filling material supplied at a predetermined pressure is scattered as a droplet from the nozzle outlet due to a large change in flow interruption and flow through the opening and closing of the nozzle, and the filling material falls outside the filling container b. Was confirmed. This is because the laminar flow can be maintained even when there is some unevenness in the flow path when the packing is flowing at a constant rate, but the flow of the packing is caused by a large change in the flow path by opening and closing the nozzle. Is presumed to be turbulent and form a turbulent flow. Therefore, in the present embodiment, in order to reduce the change in the flow when the nozzle is opened and closed, irregularities are not formed as much as possible in the flow path of the packing.
a, by forming the inner periphery of the valve seat 1a and the outer periphery of the valve body 2a into a curved surface, the generation of turbulence is suppressed, and the splash is prevented from being scattered.

The filling material sucked and pumped by the pump f of the filling device constructed as described above is filled in the nozzle device a through the supply pipe e and the connecting pipe 4. At this time, the air cylinder 3 is lowered, and the valve body 2a is in contact with the valve seat 1a, that is, the nozzle device a is in the closed state in FIG. The air cylinder 3 raises the valve rod 2 upward at the signal of the filling start, the valve body 2a is separated from the valve seat 1a and the nozzle device a is opened, and the filling is performed from the gap between the valve body 2a and the valve seat 1a. An object is discharged. When a signal indicating that the set filling amount is reached is transmitted by the metering device d, the valve rod 2 is lowered by the air cylinder 3 receiving the signal, and the valve body 2a comes into contact with the valve seat 1a to be in a closed state. . When the abutment surfaces of the valve body 2a and the valve seat 1a form a conical surface, a highly viscous liquid,
This is effective for preventing a filler such as ink from adhering to the valve body 2a and the valve seat 1a.

However, even with the nozzle device a in which the abutting surfaces of the valve body 2a and the valve seat 1a form a conical surface, it is difficult to make the adhesion of the filler zero. This is as described above with reference to FIG.
a and the shape of the tip of the valve seat 1a cause a difference in the amount of the filler attached to the tip when the nozzle device a is closed.
The amount of adhesion W is determined by the adhesive force F (kg / c
m ² ) and the area A that can be attached, and W = F × A. That is, for the same filler, the smaller the area A, the smaller the amount of adhesion W. This is still Figure 5
It can be understood from what has been described earlier using. That is,
If there is a horizontal surface at the distal end of the valve body 2a and the valve seat 1a, the filler gradually adheres to the flat surface, and if the filler increases and exceeds a certain weight, it cannot be held and causes dripping. Therefore, in order to reduce the amount of adhesion, a solution is to make the horizontal plane as small as possible when the nozzle device a is closed. In the nozzle device a according to the present embodiment, as shown in FIG. 2, the distal ends of the valve body 2a and the valve seat 1a have an acute angle, and in the closed state, the distal ends of the valve body 2a and the valve seat 1a coincide with each other to minimize the area. Is formed. Therefore, adhesion of the filler can be significantly reduced. In addition, it is desirable that both ends match in a state where the nozzle device a is closed,
The present invention does not require this. For example, FIG.
The tip of the valve body 2a is the valve seat 1a as in the nozzle device of (d).
Even if it protrudes slightly from the tip, the amount of attached filler can be minimized. On the other hand, when gas blowing is assumed, the valve seat 1 may be used as shown in the nozzle device of FIG.
Even if the tip of a protrudes slightly from the tip of the valve body 2a, the effect of preventing ink adhesion by air blowing becomes remarkable, and an effect comparable to the nozzle device a in which the tips of the valve body 2a and the valve seat 1a coincide can be obtained. it can. Further, when the valve is closed, air is blown through a gas supply hole 2b penetrating through the valve rod 2 and the valve body 2a, thereby the valve body 2a
Of the highly viscous filler falling in a funnel shape at the tip outer peripheral portion can be reliably cut by the shearing force of air.

The nozzle device a according to the first embodiment described above
A specific example of a filling experiment performed using is described below. The experimental conditions and results are shown in Table 1, and it was confirmed that filling with various viscosities can be performed without filling. In Table 1, the nozzle opening amount refers to the amount indicated by L1 in FIG. Further, the blow timing is the time of the start of blow represented by the time from the time when the closing electric signal is input to the nozzle device a. Further, the valve diameter is L in FIG.
The amount indicated by 2. As a result of the experiment, the blow timing
It was found that 0.4 seconds immediately after the valve was closed was optimal.

[0022]

[Table 1]

<Second Embodiment> FIG. 6 is a view showing a nozzle device according to a second embodiment, in which the nozzle is closed. FIG. 7 is an enlarged view of a tip portion of the nozzle device according to the second embodiment. FIG. 7A is a diagram showing a state where the nozzle is closed, and FIG. 7B is a diagram showing a state where the nozzle is opened. is there. FIG. 8 is a view showing a filling device provided with a nozzle device according to the second embodiment. FIG. 9 is a diagram showing a state in which the nozzle device according to the second embodiment is inserted into a filling port of a filling container and filling is performed. The same parts as those in the first embodiment are denoted by the same reference numerals.

In FIG. 8, a is a nozzle device according to the second embodiment, b is a filling container for storing the filler discharged from the nozzle device a, c is a conveyor for conveying the filling container b, and d is a conveyor c. , A metering device installed below, e is a supply pipe, f is a pump, and g is a motor. The filling material supplied in the direction of the arrow in the drawing is sucked up by the action of the pump f driven by the motor g and supplied to the nozzle device a through the supply pipe e. The filling material supplied to the nozzle device a is discharged toward the filling container b transported by the conveyor c. The nozzle device a is opened by detecting that the filling container b has reached the lower portion of the filling nozzle by the conveyor c by a separately provided sensor (not shown), and the weighing device d detects a predetermined filling amount. It is supposed to close.

The details of the nozzle device a according to the second embodiment will be described with reference to FIGS. The nozzle outer cylinder 1
The upper portion is a large-diameter portion 1c of the nozzle, and the lower portion is a small-diameter portion 1b of the nozzle. The diameter from the large-diameter portion 1c of the nozzle to the small-diameter portion 1b of the nozzle is conically reduced. This nozzle small diameter part 1
b has a cylindrical shape that can be inserted into the filling port b1 of the filling container b (see FIG. 9). When filling a non-open type container, for example, an oil can, a drum can, or the like, the nozzle small-diameter portion 1b serves as a guide for insertion into the filling port b1. If the nozzle device a is accidentally displaced from the filling port b1 at the time of filling, the lowering of the entire nozzle device a is prevented, so that filling errors and accidents are prevented beforehand, and the filling by scattering of the filling material is prevented. Contamination around the opening b1 can be prevented. Further, in order to stabilize the flow of the filler and maintain a laminar flow state, a large diameter is required to some extent, so that the nozzle large diameter portion 1c is conically expanded from the nozzle small diameter portion 1b.

A valve seat 1a is formed at the tip of the nozzle outer cylinder 1, that is, at the tip of the nozzle small diameter portion 1b. The contact surface of the valve seat 1a with a valve body 2a described later forms a conical surface. The nozzle outer cylinder 1 is connected to the supply pipe e via a connection pipe 4, and the hollow portion of the nozzle outer cylinder 1 communicates with the supply pipe e and the hollow part of the connection pipe 4. Accordingly, the filler fed by the pump f is supplied into the nozzle outer cylinder 1 through the supply pipe e and the connection pipe 4. Nozzle outer cylinder 1
A valve stem 2 provided with a valve element 2a at the tip is disposed in the hollow part of the above. The upper end of the valve stem 2 is the rod 3 of the air cylinder 3
a, and moves up and down in the hollow portion of the nozzle outer cylinder 1 by the operation of the air cylinder 3. The contact surface of the valve body 2a with the valve seat 1a forms a conical surface, and the nozzle device a closes and separates due to the contact between the conical surface of the valve seat 1a and the conical surface of the valve body 2a. This causes the nozzle device a to open.

A packing 8 having a surface made of ethylene tetrafluoride resin is disposed so as to slide on the valve stem 2. The packing 8 is fixed by a packing fixing tool 8a. The valve rod 2 and the valve body 2a are formed with gas supply holes 2b penetrating both. A gas inlet 2c is provided at the upper end of the valve stem 2, and when the nozzle device a is closed by introducing nitrogen gas, which is a kind of inert gas, at a necessary timing from the gas inlet 2c, the gas inlet 2c is provided at the tip. It acts as an auxiliary to prevent the packing from sticking. This nitrogen gas is supplied to the filling container b together with the filling.

The filling material sucked and pumped by the pump f of the filling device constructed as described above is filled in the nozzle device a through the supply pipe e and the connecting pipe 4. At this time, the air cylinder 3 is lowered and the valve body 2a is in contact with the valve seat 1a, that is, the nozzle device a is in the closed state shown in FIGS. 6 and 7A. In response to a signal for filling preparation, a not-shown overall elevating mechanism such as an air cylinder lowers the nozzle device a to insert the nozzle small-diameter portion 1b into the filling port b1 of the filling container b. Immediately after the insertion of the nozzle small diameter portion 1b, nitrogen gas is introduced from the gas inlet 2c. The introduced nitrogen gas is supplied to the filling container b through the gas supply hole 2b. Filling container b
When the inside is sufficiently replaced with nitrogen gas, the air cylinder 3 pulls up the valve rod 2 by a signal of the filling start.
Therefore, the valve element 2a is separated from the valve seat 1a and the nozzle device a is opened, and the filler is discharged from the gap between the valve element 2a and the valve seat 1a. FIG. 9 shows this state. It should be noted that the gas blow by the nitrogen gas is continued even during the filling.

When a signal to the effect that the set filling amount has been reached is transmitted by the metering device d, the valve rod 2 is lowered by the air cylinder 3 receiving the signal, and the valve body 2a comes into contact with the valve seat 1a and the nozzle device a is in a closed state. Valve body 2a and valve seat 1a
The contact surface of the valve body 2a forms a conical surface, so that not only the filling of the high-viscosity material but also the filling of the low-viscosity material can be used.
In addition, it is possible to effectively prevent the filler from adhering to the valve seat 1a. The gas blowing is continued after the filling is completed, and after the upper space of the filling container b is filled with the nitrogen gas, the gas blowing is stopped. Thereafter, the entire lifting mechanism such as an air cylinder (not shown) raises the nozzle device a, and a series of filling is completed. The supply pressure of the nitrogen gas is preferably 0.01 to 0.02 MPa, and the supply amount is 10 L / min.
It is good to be about. If the gas pressure is too high, the filling material is scattered by the nitrogen gas supplied when the liquid is high (when the height of the filling material in the filling container is increased) and adheres to the inner wall of the filling container b. . Further, the nozzle device a according to the second embodiment can fill a low-viscosity filler and a high-viscosity filler. In the case of a low-viscosity filler of 500 mPa · s (25 ° C.), 25 L / min, 5,000 mPa · s
s (25 ° C.), 15 L / m
It was confirmed that the filling container b could be filled at the speed of in.

In the nozzle device a according to the second embodiment, as shown in FIG. 7, the tips of the valve body 2a and the valve seat 1a have an acute angle, and in the closed state, the two tips coincide with each other to minimize the area. It has a ring shape. Therefore, adhesion of the filler can be significantly reduced. Also, by filling after filling the inside of the filling container b with nitrogen gas, continuing nitrogen gas blowing during filling, and filling the upper space in the filling container b with nitrogen gas even after completion of filling, the air Of the filler due to curing by a chemical reaction with water. As a composition that easily deteriorates and deteriorates, there is an isocyanate-excess urethane polymer called a moisture-curable compound. Representative examples include a urethane resin composition and an isocyanate-based resin composition. The curing reaction formula of the isocyanate excess urethane polymer is as follows. That is, when it reacts with moisture, it is urea bonded and hardened. Therefore, when filling with a moisture-curable compound, it is preferable to perform gas blowing using an inert gas. As previously mentioned,
Industrially purified nitrogen gas has a very low moisture content, so by performing gas blowing using nitrogen gas,
Oxidation deterioration and moisture curing of the moisture-curable compound can be effectively prevented. As an alternative to nitrogen gas,
Other inert gas such as argon may be used, but nitrogen gas is advantageous in terms of cost.

[0031]

Embedded image

Further, in the nozzle device a according to the second embodiment, the filler falls around the nitrogen gas supplied from the gas supply hole 2b. Therefore, it was confirmed that the filling material falls along with the flow of the nitrogen gas, so that the falling flowability of the filling material is improved. In order to supply the nitrogen gas into the filling container b, a method of supplying the gas from the side of the nozzle with a tube may be considered. However, depending on this method, the gas tends to be unevenly distributed to a specific portion in the filling container b, The gas was difficult to distribute evenly. In the nozzle device a according to the second embodiment of the present invention, it is confirmed that the gas is hard to be unevenly distributed in the filling container b because the filling material falls around the nitrogen gas. Further, according to the method of supplying the gas from the side of the nozzle with the tube, since the nozzle device a and the tube need to be inserted into the filling port b1, it is necessary to determine the nozzle diameter for the filling port b1 by subtracting the tube diameter. there were. On the other hand, the gas supply holes 2b are provided in the nozzle device a according to the second embodiment of the present invention.
Is advantageous in that the nozzle diameter can be made as large as possible with respect to the filling port b1.

Further, when the filler adheres to the inner wall of the nozzle outer cylinder 1, the valve stem 2, and the valve body 2a, it is necessary to clean the nozzle device a. When cleaning the nozzle device a, there are a case where the nozzle device a is disassembled and cleaned, and a case where the nozzle device a is cleaned without disassembly. When cleaning without disassembling the nozzle device a, a cleaning liquid is supplied into the nozzle device a from the liquid supply source via the connection pipe 4. Since this cleaning liquid flows below the upper end position of the connection pipe 4, the cleaning liquid does not spread to the space (the portion indicated by S in FIG. 6) in the hollow portion of the nozzle device located above the connection pipe 4. That is, when the filler adheres to this portion, it is difficult to clean this portion without disassembling the nozzle device a. For this reason, in the nozzle device a according to the second embodiment of the present invention, the space S in the hollow portion of the nozzle device located at the upper part of the connecting pipe 4 is significantly reduced as compared with the related art, so that the cleaning of the nozzle device a can be performed. It was confirmed that it would be easier. In the present invention, such a space S can be eliminated.

When changing the kind of the filling, it is necessary to disassemble the nozzle device a and clean the inside. In the nozzle device a according to the first embodiment, the bellows 7 is disposed so as to cover the shaft holder 6 and the valve stem 2, and the filler enters a sliding portion between the valve stem 2 and the shaft holder 6. Has been prevented. However, the bellows 7 has a shape having a large number of irregularities as shown in FIG. 1, and it is difficult to clean when the filler adheres to the irregularities. Therefore, in the nozzle device a according to the second embodiment, the bellows 7 is not used, and the packing 8 having the surface of which the ethylene tetrafluoride resin is formed is used. The packing 8 can prevent the filling material from flowing into the sliding portion between the valve stem 2 and the shaft holder 6 while ensuring the sliding characteristics with the valve stem 2. In addition, since the bellows 7 is not used, cleaning becomes easy.

[0035]

As described above, according to the nozzle device of the present invention, the filling can be reliably cut by a relatively simple combination of structures, and the filling does not drip or string. Therefore, a wide range of liquids to highly viscous materials can be reliably filled, and the number of filling cycles for liquid dripping and stringing is not reduced, and the surroundings of the filled container are not stained. Further, according to the filling method of the present invention, the filling material falls along the gas flow, so that the falling flow of the filling material can be improved. If nitrogen gas is used as the inert gas,
Oxidation deterioration and moisture curing of the moisture-curable compound can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a nozzle device according to a first embodiment of the present invention.

FIG. 2 is an enlarged front end view of the nozzle device according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of the nozzle device according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating a filling device including the nozzle device according to the first embodiment of the present invention.

FIG. 5 is a diagram showing the state of ink adhesion when various types of valve seats and valve elements are used.

FIG. 6 is a view showing a nozzle device according to a second embodiment of the present invention.

FIG. 7 is an enlarged front end view of a nozzle device according to a second embodiment of the present invention, in which (a) shows a state in which the nozzle is closed,
(B) is a figure which shows the state which opened the nozzle.

FIG. 8 is a view showing a filling device provided with a nozzle device according to a second embodiment of the present invention.

FIG. 9 is a view showing a state in which the nozzle device according to the second embodiment of the present invention is inserted into a filling port of a filling container and filling is performed.

FIG. 10 is an enlarged view of a tip portion of a conventional nozzle device;
(A) is a figure which shows the state which closed the nozzle, (b) is a figure which shows the state which opened the nozzle.

[Description of Signs] a: Nozzle device, b: Filling container, c: Conveyor, d: Measuring device, e: Supply pipe, f: Pump, g: Motor, h: Storage tank, 1 ... Nozzle outer cylinder, 1a ... Valve seat, 1b: nozzle small diameter portion, 1c: nozzle large diameter portion, 1d: ferrule clamp, 2: valve rod, 2a: valve body, 2b: gas supply hole, 2c ...
Gas inlet, 3 ... Air cylinder, 3a ... Rod, 4 ... Connection tube, 5 ... Safety cover, 6 ... Shaft holder, 6a ... Oilless bearing, 6b ... Pressure relief hole, 7 ... Bellows, 7a ... Bellows fixed Tool, 7b O-ring, 8 packing, 8a packing fixing

 ──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Kazunori Hino 2-3-8 Kibogaoka, Kumatori-cho, Sennan-gun, Osaka F-term (reference) 3E055 AA01 CA10 CB05 DA20 EA01 EB01 FA10 3E079 AA07 AB03 BB01 CC11 CD34 DD06 DD35 DD43 EE02 EE12 FF01 4F033 AA01 BA06 CA01 DA01 EA01 GA02 GA06 GA10 LA13 NA01

Claims (9)

[Claims] 1. A nozzle outer cylinder having a hollow portion penetrating in an axial direction and having a valve seat formed at one end, a valve stem and a valve body provided at one end of the valve stem, and the hollow of the nozzle outer cylinder is provided. A valve for raising and lowering a portion, a nozzle device for adjusting the flow rate of the filler by adjusting the gap of the valve body to the valve seat, wherein the contact surface between the valve seat and the valve body is conical A nozzle device, wherein a surface is formed, and a tip portion of the valve seat and a tip portion of the valve element form an acute angle. 2. When the nozzle device is fully closed, the tip of the valve seat and the tip of the valve body coincide, or the tip of the valve seat protrudes from the tip of the valve body. The nozzle device according to claim 1, wherein: 3. The nozzle device according to claim 1, wherein the valve has a gas supply hole passing through the valve stem and the valve body. 4. The support member further comprises: a support member that supports the valve rod while slidingly contacting the valve stem; and a flexible sealing member that covers the support member to prevent contact between the support member and the filler. The nozzle device according to any one of claims 1 to 3, further comprising a pressure relief hole. 5. The nozzle device according to claim 1, wherein a contact portion of the valve body with the filling material has a curved surface. 6. The valve according to claim 1, wherein the tip of the valve seat and the tip of the valve element form an angle of 25 ° to 60 °, and the sum of the angles is 50 ° to 120 °. The nozzle device according to any one of claims 1 to 5. 7. A nozzle outer cylinder having a hollow portion penetrating in the axial direction and having a valve seat at one end, a valve stem and a valve body provided at one end of the valve stem, and the hollow of the nozzle outer cylinder is provided. Using a nozzle device that adjusts the gap of the valve body with respect to the valve seat to adjust the flow rate of the filling material. The nozzle device, wherein the contact surface between the valve seat and the valve body forms a conical surface, and both the tip of the valve seat and the tip of the valve body form an acute angle. Filling a filling material from the nozzle device while supplying gas to a filling port of the container. 8. The filling method according to claim 7, wherein the filling is a moisture-curable compound. 9. The filling method according to claim 7, wherein the gas is an inert gas.