JPH0721251Y2 - Adhesive coating device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive coating device for coating an adhesive surface with an adhesive which reacts to air and hardens rapidly.

[0002]

2. Description of the Related Art Conventionally, a roll coater system as shown in FIG. 5, a spray system as shown in FIG. 6, and a beat system as shown in FIG. There is.

Therefore, first, in a roll coater system as shown in FIG. 5, two rolls 1 and 2 whose rotation axes are parallel to each other and whose outer peripheral surfaces are in contact with each other are provided at fixed positions. A liquid adhesive 3 is accumulated on the upper surface of the roll 1, and the adhesive 3 is attached to the outer peripheral surface of one of the rolls 1 by the rotation of the two rolls 1 and 2. The adhered plate 4 is attached to the outer peripheral surface of the one roll 1. The plate-to-be-adhered 4 is moved by bringing the plate-to-be-bonded into contact with each other to apply the adhesive to the plate-to-be-attached 4.

Next, the spray system as shown in FIG. 6 is constructed so that the adhesive in the adhesive tank 5 is sprayed from the spray nozzle 6 to the plate 7 to be adhered by air pressure feeding.

Next, in the beat method as shown in FIG. 7, an adhesive tank 8 having a large number of nozzles 8a facing downward is arranged at a fixed position, and a plate 9 to be attached is placed below the adhesive tank 8.
The adhesive 10 is continuously supplied to the adhesive tank 8 to discharge the adhesive 10 in the form of threads from the nozzle 8a, thereby applying the adhesive to the adherend plate 9. There is.

[0006]

In each of the above-mentioned conventional methods, the roll coater method is such that the liquid adhesive 3 on the two rolls 1 and 2 and the adhesive adhered to the surfaces of the rolls 1 and 2 are always Since it is in contact with air and liquid adhesive is continuously supplied to the surfaces of the rolls 1 and 2 during the work, there is no problem, but when the work is stopped, the liquid adhesive adheres particularly to the surfaces of the rolls 1 and 2. There is a problem that the adhesive present reacts with the air and hardens rapidly, and the two rolls 1 and 2 stick to each other.

Further, in the spray system, air is pressure-fed for spraying the adhesive from the spray nozzle 6, the air is mixed with the adhesive in the adhesive tank 5, and when the spraying work is stopped, the adhesive tank 5 The adhesive inside is rapidly cured, and the adhesive is rapidly cured at the inlet end of the pipe connecting the adhesive tank 5 and the spray nozzle 6,
Furthermore, the adhesive rapidly hardened at the outlet of the spray nozzle 6, and it was necessary to replace a plurality of parts when the work was restarted.

Further, in the beat method, the adhesive 10 is discharged in the form of threads from the nozzle 8a by continuously supplying the adhesive to the adhesive tank 8, but to the adhesive tank 8 to stop the work. When the continuous supply of the adhesive is stopped, the adhesive drips from the lower end of the nozzle 8a for a while, air enters the upper space of the adhesive tank 8, and the adhesive remaining in the adhesive tank 8 becomes air. There is a problem of curing by touching, and if the curing range is wide, each adhesive tank had to be replaced. Further, when the continuous supply of the adhesive to the adhesive tank 8 is stopped in order to stop the work, a residual pressure is applied and the amount of the adhesive drooping from the nozzle 8a increases. Therefore,
A stop valve may be attached to the tip of each nozzle 8a in order to prevent the adhesive from dripping from the nozzle 8a, but the nozzle pitch is determined by the size of the stop valve, and the number of nozzles cannot be increased. There is also a problem that if a control unit for automatically opening and closing the stop valve is provided, it becomes a considerably expensive device.

The present invention solves such a problem. In the beat method, the dropping of the adhesive is suppressed, the air contact with the liquid adhesive inside is reduced, the work can be resumed smoothly, and the cost is low. The purpose is to provide a device.

[0010]

In order to solve this problem, the present invention provides an adhesive application device for applying an adhesive to a plate to be attached by discharging the adhesive in a filament form from each nozzle of an adhesive tank. That is, the liquid adhesive inside the internal space is attached to the adhesive tank provided with the elongated internal space in the horizontal direction at appropriate intervals along the longitudinal direction of the elongated internal space. A nozzle for discharging the adhesive is provided so as to project downward from the adhesive tank for taking out, and a valve device is provided so that an internal flow path communicates with the internal space of the adhesive tank. A valve body that can be pressed into and released from a downwardly constricted valve seat formed in the middle of the internal flow path, a spring that urges the valve body in a direction of pressing the valve seat from above, and the valve. Move the body away from the valve seat against the bias of the spring A rod which can be moved up and down with respect to the valve body while being lifted in the same direction, means for moving the rod up and down, and a rod between a flange portion provided in the vertical center of the rod and the bottom of the valve device. A rubber packing for sealing, which is externally fitted to the inside, is built in.

[0011]

With this configuration, in the bead-type adhesive application device, when the supply of the liquid adhesive from the adhesive storage section to the adhesive tank is stopped by closing the internal flow path of the valve device, The residual pressure of the pump acts on the internal space of the adhesive tank, and the adhesive existing in the internal flow path below the valve seat portion tends to be pushed toward the internal space of the adhesive tank. The valve body is lowered by the force of the spring to come into pressure contact with the valve seat portion, and when the rod is further lowered from that state, the rubber packing is pressed and deformed between the flange portion and the bottom portion of the valve device, and the valve body is lowered. The space in the internal flow path below the pressure contact portion between the valve seat portion and the valve body becomes larger than the moment of pressure contact with the valve seat portion, and the internal pressure of the internal space of the adhesive tank is pulled in. As a result, the residual pressure from the pump does not act on the adhesive tank, and conversely, it is possible to prevent the internal pressure of the internal space of the adhesive tank from being drawn and the liquid adhesive from dripping from the nozzles. It is difficult for the outside air to enter the inside of the tank, the air contact with the liquid adhesive is reduced, and work can be resumed smoothly.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 4, reference numeral 11 denotes an adhesive tank, and an internal space 12 thereof has a semi-arcuate portion at a lower end and an inverted V-shaped portion located at an upper portion thereof, and has an elongated shape in a horizontal direction. There is. Reference numeral 13 is a tube attached along the longitudinal direction of the elongated internal space 12 at appropriate intervals to take out the liquid adhesive 14 inside the internal space 12.
The upper end opening 13a of 13 is cut like a so-called tip of a straw and is pointed so as to be located at the upper end of the internal space 12. Further, the lower end of the tube 13 is located at the lower end of the adhesive tank 11, and a nozzle 15 for discharging an adhesive is detachably attached to the tube 13 so as to project downward from the adhesive tank 11.

Reference numeral 16 denotes a valve device located at the center of the adhesive tank 11 in the longitudinal direction and having a lower end of an internal flow path 17 communicating with the lower part of the internal space 12, and the internal flow path 17 of the valve device 16 is The upper end is connected to an adhesive storage section (not shown) via a pipe.

By the way, in the main body 18 of the valve device 16, the internal flow passage 17 is formed in substantially the upper half thereof, and a downward constricted valve seat portion 19 is formed in the middle of the internal flow passage 17, and this valve seat portion is formed. A valve body 20 that can be pressed and released with respect to 19 is built in. The valve body
20 is urged from above by a spring 21 in a direction in which it is pressed against the valve seat portion 19, and the rod 22 is raised so that the valve body 20 rises in a direction away from the valve seat portion 19 against the urging force of the spring 21. Rod 22
Has its upper end fitted in the recess 20a of the valve body 20 up and down with some play, and its lower end projects below the valve device body 18,
It is biased downward by the spring 23. 24 is the rod
It is a flange portion provided at the central portion in the vertical direction of 22 and forms the lower end of the internal flow path 17, and this flange portion 24
A rubber packing 25 for sealing is externally fitted and provided on the rod 22 between the valve 22 and the bottom of the valve device body 18. The upper end of the rubber packing 25 is fixed to the lower surface of the flange 24, and the lower end thereof is fixed to the upper surface of the bottom of the valve device main body 18 so that the liquid adhesive does not leak. Reference numeral 26 is a small flange portion that is provided on the rod 22 above the flange portion 24 and is capable of coming into contact with and detaching from the lower surface of the valve body 20. That is,
When the valve body 20 is lifted in a direction away from the valve seat portion 19, the rod portion 22 is lifted to bring the flange portion 26 into contact with the lower surface of the valve body 20 to lift the valve body 20. As a result, the internal flow path 17 is opened (see FIG. 3). When the rod 22 is lowered from the state shown in FIG. 3, the flange portion 26 is also lowered, the valve body 20 is lowered by the force of the spring 21 and is pressed against the valve seat portion 19, and from that state, the rod 22 is further moved. When descending, the rubber packing 25 is pressed and deformed between the flange portion 24 and the bottom portion of the valve device main body 18, and the internal flow passage
17 is closed (see FIG. 4).

The lifting and lowering operation of the rod 22 is performed by the rod 22.
A cam or the like can be brought into contact with the lower end of the, and the cam or the like can be driven. Further, in the figure, reference numeral 27 is a valve for bleeding air from the adhesive tank 11 when injecting the liquid adhesive 14 into the adhesive tank 11, and the injection of the liquid adhesive 14 into the adhesive tank 11 is prevented. When finished, the valve 27 is closed.

In the above construction, when the liquid adhesive 14 is discharged from a large number of nozzles 15 for discharging the adhesive attached to the adhesive tank 11 and applied to the adherend plate, the internal flow of the valve device 16 is The liquid adhesive 14 inside the adhesive tank 11 is pushed by supplying the liquid adhesive 14 to the adhesive tank 11 by a pump from the adhesive storage part (not shown) by opening the passage 17 and the tube. After entering the nozzle 13, the nozzles 15 discharge the filaments into filaments, and the adhesive is applied to the adherend plate that moves under the adhesive tank 11.

After the application of the adhesive to one sheet to be adhered is completed, the internal flow path 17 of the valve device 16 is closed so that the adhesive tank from the adhesive storage section (not shown) is reached.
The supply of the liquid adhesive 14 to 11 is stopped. Thus, when the supply of the liquid adhesive 14 is stopped, the liquid adhesive inside the adhesive tank 11 existing above the upper end opening 13a of the tube 13 enters from the upper end opening 13a of the tube 13 and each nozzle 15
Although it drips from the nozzle, the upper end of the internal space 12 of the adhesive tank 11 is pointed in an inverted V shape as described above, and the amount of adhesive dripping from each nozzle 15 is small. Further, after the adhesive drips in this way, there is a space at the upper end of the internal space 12, and even if air enters the inside of each nozzle 15 and each tube 13 from below, the inside of the adhesive tank 11 The amount of air that comes into contact with the upper end surface of the liquid adhesive 14 remaining in the space 12 is small, and the work can be restarted smoothly.

Also, the internal flow path 17 of the valve device 16 is closed, and the adhesive tank 11 from the adhesive storage section (not shown) is provided.
When the supply of liquid adhesive 14 to the
Residual pressure from the pump acts on the internal space 12 of 11,
The adhesive existing in the internal flow path 17 below the valve seat portion 19 is about to be pushed to the internal space 12 side of the adhesive tank 11.
In the valve device 16, the valve body 20 descends due to the force of the spring 21 and presses against the valve seat portion 19, and when the rod 22 further descends from that state, the rubber packing 25 causes the flange portion 24 and the bottom portion of the valve device body 16 to move. Between the valve seat 20 and the valve seat 20 is pressed and deformed, and the space in the internal flow passage 17 under the pressure contact portion between the valve seat 19 and the valve body 20 becomes larger than the space at which the valve seat 19 and the valve body 20 are pressed. Therefore, the internal pressure of the internal space 12 of the adhesive agent tank 11 is pulled in. As a result, the residual pressure due to the pump does not act on the adhesive tank 11, and conversely, the internal pressure of the internal space 12 of the adhesive tank 11 is pulled in and the liquid adhesive is prevented from dripping from the nozzles 15. You can

Further, since the upper end of the rubber packing 25 is adhered to the lower surface of the flange portion 24 and the lower end thereof is adhered to the upper surface of the bottom portion of the valve device main body 18 respectively so that liquid adhesive does not leak, the valve device main body is adhered. The liquid adhesive does not leak from the lower end penetrating portion of the rod 22 at the bottom of 18, and is not affected by air.

By the way, the upper end opening 13a of the tube 13
Since it is cut and pointed like the tip of a so-called straw, the inlet area when the liquid adhesive flows into the tube 13 becomes large, and even if the adhesive partially hardens due to contact with air, the tube 13 It does not prevent the inflow of adhesive into the. The shape of the upper end opening 13a of the tube 13 is not limited to the elliptical shape shown in the drawing.

Further, since the upper end of the internal space 12 of the adhesive tank 11 is pointed in an inverted V shape, the adhesive sent under pressure to the adhesive tank 11 is concentrated to the inlet of the upper end of the tube 13. Can be supplied.

[0022]

As described above, according to the present invention, in the bead type adhesive application device, the internal flow path of the valve device is closed, and the liquid adhesive is adhered from the adhesive storage part to the adhesive tank. When the supply of the agent is stopped, the residual pressure of the pump acts on the internal space of the adhesive tank, and the adhesive existing in the internal flow path below the valve seat is pushed toward the internal space of the adhesive tank. However, in the valve device, the valve body descends due to the force of the spring and presses against the valve seat portion, and when the rod further descends from that state, the rubber packing presses between the flange portion and the bottom portion of the valve device body. The space inside the internal flow path under the pressure contact portion between the valve seat portion and the valve body becomes larger than the moment when the valve body is deformed and comes into pressure contact with the valve seat portion, and the internal pressure of the internal space of the adhesive tank is drawn in. It will be. As a result, the residual pressure from the pump does not act on the adhesive tank, and conversely, it is possible to prevent the internal pressure of the internal space of the adhesive tank from being drawn and the liquid adhesive from dripping from the nozzles. It is difficult for the outside air to enter the inside of the tank, the air contact with the liquid adhesive is reduced, and work can be resumed smoothly. Further, it is not necessary to attach a stop valve to each nozzle, the nozzle pitch can be reduced, the number of nozzles can be increased, and an inexpensive device can be provided.

[Brief description of drawings]

FIG. 1 is a front view of an adhesive application device according to an embodiment of the present invention.

FIG. 2 is a bottom view of the same.

FIG. 3 is a side sectional view of the same.

FIG. 4 is a front sectional view of a valve device provided in the adhesive application device.

FIG. 5 is an explanatory diagram of a conventional roll coater type adhesive coating device.

FIG. 6 is an illustration of a conventional spray-type adhesive application device.

FIG. 7 is an explanatory diagram of a conventional bead-type adhesive application device.

[Explanation of symbols]

 11 Adhesive tank 12 Internal space 13 Tube 14 Liquid adhesive 15 Nozzle 16 Valve device 17 Internal flow passage 18 Valve device body 19 Valve seat 20 Valve disc 21 Spring 22 Rod 23 Spring 24 Flange 25 Rubber packing 26 Flange

Claims (1)

[Scope of utility model registration request] 1. An adhesive applicator for applying an adhesive in a thread form from each nozzle of an adhesive tank to apply the adhesive to a plate to be adhered, and having a horizontally long internal space. Attached to the adhesive tank at appropriate intervals along the longitudinal direction of the elongated internal space so as to project downward from the adhesive tank to take out the liquid adhesive inside the internal space. A nozzle for discharging is provided, and further, a valve device is provided so that an internal flow path communicates with the internal space of the adhesive tank, and the valve device has a downward constricted valve formed in the middle of the internal flow path. A valve body that can be pressed into and released from a seat portion, a spring that urges the valve body in a direction in which the valve body is pressed against the seat portion, and the valve body is separated from the valve seat portion against the biasing force of the spring. Direction and move vertically with respect to the valve body A possible rod, means for moving the rod up and down, and a rubber packing for sealing provided on the rod between the flange portion provided at the vertical center of the rod and the bottom portion of the valve device. Adhesive applicator with built-in.