JPS6225250Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an adhesive coating device, and more particularly to an adhesive coating device with an exhaust device.

PRIOR ART During bonding work, adhesive vapor rises up, and when workers work near the area where the vapor rises, the working environment becomes extremely poor. In order to avoid such a bad environment, countermeasures such as blowing away the steam with a fan from behind the worker are taken, but although this improves the situation for the worker in question, it adversely affects the work downwind. It cannot be said that the working environment has improved as the situation has deteriorated. However, adhesive applicator devices are generally designed to be very compact, and this is particularly true for such devices that handle hot melt adhesives. Although this type of design concept focuses on preventing adhesive vapor leakage, no effort has been made to proactively deal with adhesive vapor, and in reality, adhesive application equipment equipped with an exhaust system is can not see.

Purpose of the invention The present invention focuses on the above-mentioned problems and aims to provide an adhesive applicator that can be vented without reducing adhesive efficiency.

Structure of the Invention According to the present invention, there is provided an adhesive applicator in which a hole is formed in the lid of an adhesive dissolving tank and adhesive is applied to an object to be adhered above the lid through the hole. An adhesive applicator is provided, characterized in that an exhaust duct is provided that opens into an adhesive dissolving tank above the adhesive surface, and a filter means is disposed in the duct.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an adhesive applicator according to a first embodiment of the present invention, and FIG. 2 is a front view as viewed from the direction of arrow A in FIG. A melting tank 3 is attached to a base frame 1 of an adhesive coating device and is surrounded by a heat insulating material 2. A heater 4 is placed in the melting tank 3 so that hot melt adhesive can be used.

The upper surface of the dissolving tank 3 is formed by a lid 5, which also serves as a setting table on which objects to be adhered are placed. A plurality of through holes 6 are formed in the lid 5. An adhesive applicator rod 7 extends vertically corresponding to the position of the through hole 6, and the applicator rod 7 is connected to a common applicator rod stay 8. 10 indicates the surface of the melted adhesive.

An opening 11 is formed in the lid 5 of the dissolution tank 3 at the end farthest from the through hole 6, and a hood 12 is attached around this opening 11. The hood 12 is connected to a duct 13, and a filter 14 is inserted into the connection part. Electric fan 1 in duct 13
5 is installed. In this adhesive applicator, the front direction as seen from arrow A in Fig. 1 is the working side, and the duct 13 extends on the opposite side from the working side, curves vertically downward, and terminates near the applicator. .

The aforementioned hood 12 also serves as a mounting bracket for the pneumatic cylinder 16, and the operating piston 17 of the pneumatic cylinder 16 extends vertically downward, and one end of the aforementioned applicator rod stay 8 is connected to the tip of the piston 17. , a coating rod 7 connected to a coating rod stay 8 is driven vertically and up and down by a pneumatic cylinder 16.

When performing adhesive application work, an object to be adhered (not shown) is placed on the lid 5 (setting table). The arrangement of the application rod 7 is selected according to the position where the adhesive is to be applied. The applicator rod 7 is driven by a pneumatic cylinder 16 and is movable between a submerged position in the adhesive as shown in the figure and a raised position in which it engages the material to be adhered on the lid 5 through the through hole 6. can. The adhesive is applied to the top of the applicator rod 7 in the sunken position and to the underside of the object in the raised position. The object to be adhered to which adhesive has been applied in this manner can then be joined to other parts, and this process is repeated.

The adhesive in the melting tank 3 is heated by the heater 4 and is softened or liquefied, and a portion of the adhesive becomes vapor at this time.
The dissolution tank 3 is formed airtight except for a predetermined opening. Therefore, when the fan 15 disposed in the exhaust duct 13 is driven, the vapor above the liquid level in the dissolution tank 3 is sucked into the exhaust duct 13 through the opening 11. Therefore, the space above the liquid level in the dissolution tank becomes a negative pressure state, and outside air at atmospheric pressure flows in through the through hole 6. In this way, an air flow is generated as shown by the arrow in FIG. It will not be ejected. The air and adhesive vapor are purified by passing through the filter 14, and are discharged from the discharge end of the duct as substantially clean air. For this reason, the discharge end of the exhaust duct 13 can be placed in the immediate vicinity of the adhesive application device, which is advantageous in terms of space and duct piping.
Although the filter 14 naturally becomes clogged due to the purifying action, tests have confirmed that it can be used for several months in this manner of use. Therefore, the operator does not come into direct contact with adhesive vapor, and a favorable working environment is established.

Fresh air always flows above the liquid level in the dissolving tank 3, and therefore the surface of the adhesive applied to the application rod 7 is cooled and a relatively high viscosity film is formed on the surface layer. This reduces the amount of vapor components dissipated from the adhering adhesive on the applicator rod 7 protruding near or beyond the top surface of the lid 5. Since the viscosity of the surface layer of the coating liquid increases, excessive seepage when applied to an object to be adhered is prevented, resulting in a stable coating layer thickness and stable adhesive strength. Further, in this embodiment, since the pneumatic cylinder 16 and the piston 17 are arranged above the adhesive, the problem of liquid leakage from the sliding part is also solved.

In the second embodiment shown in FIG. 3, most of the configurations are similar to the embodiment shown in FIG. 1, so only the differences will be described. In FIG. 3, a pneumatic cylinder 16 for driving the applicator rod 7 is arranged below the melting tank 3, and the hood 12 is used only for evacuation. It is common to place the pneumatic cylinder 16 below the dissolution tank 3, but in this case, it is necessary to pay close attention to sealing, and there are cases where the height of the entire device is restricted. Such a configuration is advantageous. The operation is similar to that of the embodiment shown in FIG. The third embodiment shown in FIG. 4 is a development of the embodiment shown in FIG. In this example, a duct 18 is extended above the liquid level 10 in the dissolution tank 3 along the vertical inner wall surface of the dissolution tank, and this duct 18 is connected to the hood 12 and the exhaust duct 13 through the opening 18 of the lid 5. Connected. The extension duct 18 is provided with a plurality of opening holes 19, and the hole diameters of these opening holes 19 become larger as they go farther from the hood 12. This is to ensure uniform exhaustion from all areas of the space above the liquid in the dissolution tank 3 in accordance with the principle of fluid flow. Other functions are the same as those in the above embodiment.

Effects As explained above, according to the present invention, by providing an exhaust duct and a filter, the dispersion of abnormal odors, etc. is prevented without the need for complicated piping, and the working environment is improved. Furthermore, since a film is more easily formed on the surface layer of the adhesive, the stability of adhesion is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the adhesive applicator according to the first embodiment of the present invention, FIG. 2 is a front view seen from arrow A in FIG. 1, and FIGS. FIG. 3 is a cross-sectional view of an adhesive coating device according to an example and a third example. 3...Dissolution tank, 5...Lid, 6...Through hole, 7...
...Applying rod, 8...Applying rod stay, 11...
...Opening, 12...Hood, 13...Exhaust duct, 14...Filter, 15...Fan, 16
...Pneumatic cylinder, 18...Extension duct, 19
...Open hole.

Claims (1)

[Scope of utility model registration request] In an adhesive application device, a hole is formed in the lid of an adhesive dissolving tank, and adhesive is applied to an object to be adhered above the lid through the hole. 1. An adhesive application device comprising: an exhaust duct opening into a dissolution tank; and a filter means is disposed in the duct.