JPH0523260Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention melts a stick-shaped hot-melt resin adhesive by catalytic combustion of a mixed gas of fuel gas and air and discharges it from a discharge nozzle. The present invention relates to a gun-type adhesive dispenser, and more particularly to a catalytic combustion device.

[Prior Art] A conventional adhesive dispenser uses an electric heater to heat and melt a stick-shaped adhesive inserted into a melting pipe, and then discharges it from a nozzle at the tip to perform bonding work. However, since a power source is used to melt the adhesive, the placement of the power source is limited when used in warehouses, for example, when bonding for packaging, so the location where the power source can be placed is limited. Also, there are problems such as the fact that it cannot be used outdoors or other places without a power source.

Therefore, as an attempt to solve the above problems, the present application proposes a gun-type adhesive dispensing device that melts and discharges adhesive by catalytically burning fuel gas in a flameless state without causing a fire instead of using electricity. It was proposed by a person and is the first application filed.

[Problems to be solved by the invention] The adhesive dispensing device described above is effective as it can be used anywhere, indoors or outdoors, and has good versatility. Since the oxidation catalyst is wrapped around the outer periphery and a gas jet pipe and ignition heater are introduced to the oxidation catalyst, the catalytic combustion flame spreads radially, which still poses a problem in terms of heat transfer efficiency. ing.

The present invention is an attempt to solve the above problems. An oxidation catalyst is installed on one side of the melting pipe around the outer periphery of a gas jet pipe, a cylindrical wire mesh, a coil spring, etc., and the outer periphery is covered with a heat retaining cylinder. By arranging catalytic combustion devices in parallel and providing a catalytic combustion exhaust gas passage at the tip of the catalytic combustion devices,
Since the exhaust direction of catalyst combustion exhaust gas is constant, the flame does not spread radially, making it safe and improving heat conduction efficiency, as well as keeping the exhaust gas warm on the surface to be bonded and the adhesive discharged onto the surface to be bonded. The objective is to provide an adhesive dispenser that can be used for

[Means for solving the problem] That is, the present invention provides an adhesive dispenser which is provided with a catalytic combustion device formed of a gas ejection tube 11a, an oxidation catalyst attached to the outer periphery of the gas ejection tube, and a heat retaining tube 11d covering them, in parallel with one side of a melting pipe 3 for melting an adhesive that is disposed through a main body 1, melts a stick-like hot melt resin adhesive by catalytically combusting a mixture of fuel gas and air, and dispenses the molten adhesive, and provides a catalytic combustion exhaust gas passage 12 at the tip of the catalytic combustion device, and provides an exhaust port 13 at a position facing the catalytic combustion exhaust gas passage of the main body 1, the catalytic combustion exhaust gas passage and the exhaust port 13 are disposed coaxially, and provides a mixing tube 11b near the rear end of the catalytic combustion device for ejecting a mixture of combustion gas and air in the axial direction of the catalytic combustion device.
4 is provided to solve the above problem.

[Embodiment] An embodiment of the present invention will be described below in detail based on the drawings.As shown in FIG. At the upper part of the main body 1, there is a melting pipe 3 for inserting and storing a stick-shaped hot-melt resin adhesive 2.
It penetrates the front end opening 4 and is arranged horizontally,
A discharge nozzle 5 is connected to the tip protruding from the main body 1, and within the nozzle 5 is arranged a ball valve 7 which is biased toward the melt pipe 3 by a spring 6.

A bushing 8 and a metal tube 9 are sequentially mounted on the rear end of the melting pipe 3, and when the bushing 8 is fitted into the rear opening 10 of the main body 1, the rear end of the melting pipe 3 is attached to the main body. 1 is supported.

In order to smoothly insert the stick-shaped adhesive 2 into the melting pipe 3 through the bush 8, the bush 8 is preferably made of Teflon, which has excellent heat resistance and non-stick properties.

Inside the main body 1, a catalytic combustion device 11 is arranged in parallel below the melting pipe 3, and a catalytic combustion exhaust gas passage 12 is provided at the tip of the catalytic combustion device 11, that is, at the left end in the figure. It is provided so that exhaust gas can be exhausted from an exhaust port 13 provided at the front end of the main body 1 in parallel with the discharge nozzle 5.

In the catalytic combustion device 11, a cylindrical primary oxidation catalyst 11b is attached to the outer periphery of a cylindrical mixed gas jet pipe 11a or a cylindrical wire mesh or a coil spring (not shown), and the primary oxidation Catalyst 1
A secondary oxidation catalyst 11c is attached to the outer periphery of the secondary oxidation catalyst 11c, a metal heat-retaining cylinder 11d is placed around the secondary oxidation catalyst 11c, and the heat-retaining cylinder 11d is attached to the melting pipe 3. ing. In this case, catalyst 1
Combustion heat around 1b and 11c is transmitted to the melting pipe 3 through the heat retaining cylinder 11d.

Also, in this case, the catalytic combustion exhaust gas passage 12
is provided at the tip of the heat retaining cylinder 11d.

Further, as shown in FIG. 2 A and B, the catalytic combustion device 11 has a primary oxidation catalyst 11b and a secondary oxidation catalyst 11c installed around the ejection pipe 11a in order, and Next oxidation catalyst 11c and melt pipe 3
It can also be formed by attaching a heat retaining cylinder 11d around it.

In this case, the melting pipes are catalysts 11b, 11c.
In addition, the heat around the catalysts 11b and 11c is transmitted to the melting pipe 3 through the heat retaining cylinder 11d. Also, heat retention tube 1
The front end opening 1d becomes the catalytic combustion exhaust gas passage 12.

In addition, as shown in Fig. 3 A and B, the heat retaining cylinder 11
d is formed integrally with the melting pipe 3, and a one equipped with both primary and secondary oxidation catalysts 11b and 11c is inserted around the ejection pipe 11a into the heat retaining cylinder 11d from its base end opening. The catalytic combustion device 11 can also be formed using the same method.

In this case, heat conduction to the melting pipe 3 takes place in the same way as in the case shown in FIG.

Further, the catalytic combustion exhaust gas passage 12 has a heat retention cylinder 11d.
It is opened in the tip wall of.

Further, the jet pipe 11a is connected to a mixing pipe 14, and the mixing pipe 14 is connected to a cam switch 26, which will be described later.
Or a gas provided in a part of the gas tank 15 located at the lower part of the main body 1, or integrally with the gas tank 15, so that the amount of gas flowing out can be controlled via a valve (not shown) that is opened and closed by an ignition switch or a dedicated switch. The adjustment mechanism 16 is connected to the gas pipe 17, and this gas adjustment mechanism 16 is shown in FIGS. 4 and 5.
As illustrated in the figure, a mechanism using a valve structure and bimetal may be used.

That is, as shown in FIGS. 4 and 5, one end of the bimetal 18 is attached to the melting pipe 3, and the bimetal 18 is held parallel to the melting pipe 3 at room temperature, and the reset rod 20 of the valve body 19 is pushing up.

This state is the open state of the valve body 19, and gas enters from the gas inlet passage 21 connected to the gas tank 15, flows out to the gas outlet passage 22 connected to the gas pipe 17, and enters the gas pipe 17. It flows out into the connected mixing pipe 14, and is diffused and supplied to the catalysts 11b and 11c from the ejection pipe 11a.

When catalytic combustion begins and the temperature of the melt pipe 3 rises, the bimetal 18 curves downward as shown by the two-dot chain line in the figure, and the push-up of the reset rod 20 is released, so that the valve body 19 is moved by the interposed compression spring. 23 and seats on the valve seat 24, closing the valve hole 25 and stopping the outflow of gas. By the above operation, the valve body 19 repeatedly opens and closes continuously near the set temperature, and each time the outflowing gas is ignited by the ignition means described later to maintain the melting pipe 3 at the set temperature.

Further, as a fuel gas ignition means, a piezoelectric element ignition device 27 operated by a cam switch 26 as shown in FIG. 1 may be used. In this case, the end 28a of the lead wire 28 is connected to the It may be arranged near the tube 14 to generate sparks.

In addition, it is also possible to use an ignition switch (not shown). In this case, an ignition heater is placed in contact with the catalyst, and when the ignition switch is operated, electricity is applied from a battery (not shown) to the ignition heater, causing it to become red hot. This may ignite the fuel gas.

Further, behind the melting pipe 3, a medium-chamber-shaped feeding table 29 is arranged, and by pulling a trigger 30 that is pivotally supported on the main body 1, it is interlocked with a link 31 that is pivotally connected to the trigger 30. The stick-shaped adhesive 2 is clamped by a clamp arm 32 and is pressed and moved in the direction of the melting pipe 3.

Here, as the fuel gas, liquefied petroleum gas such as butane and propane that vaporizes at room temperature, natural gas, city gas, etc. are used.

In addition, the materials for the oxidation catalysts 11b and 11c include platinum, palladium, rhodium, iron, nickel, and chromium. Those that meet the conditions are good.

The oxidation catalysts 11b and 11c themselves preferably have a structure in which the catalyst material is supported on a mesh carrier made of a string-like inorganic carrier such as rock wool, silica, alumina fiber, glass fiber, etc. It may be made of a cloth carrier or a honeycomb-like or foam-like cylinder.

Next, to explain the function of the adhesive dispenser of the present invention, in the illustrated example, when the cam switch 26 is rotated, a valve (not shown) in the gas adjustment mechanism 16 opens, and the fuel gas in the gas tank 15 is mixed through the gas pipe 17. The mixed gas flowing out into the pipe 14 and mixed with air is sent to the catalysts 11b and 11c through the ejection pipe 11a.
diffusely supplied to the

At this time, the piezoelectric element ignition device 27 is activated by the cam switch 26, so a spark is generated from the end 28a of the lead wire 28, the above-mentioned mixed gas is ignited, the fuel gas starts catalytic combustion, and this combustion The stick-shaped adhesive 2 inserted into the melting pipe 3 is melted by the heat. Then, when the trigger 30 is pulled, the stick-shaped adhesive 2 is clamped by the clamp arm 32 that is linked to this, and the stick-shaped adhesive 2 is moved together with the feed table 29 in the direction of the melting pipe 3, and the stick-shaped adhesive inserted therein is 2 into the melting pipe 3, and the molten adhesive melted in the melting pipe 3 is pushed out and discharged from the discharge nozzle 5.

When the trigger 30 is released, the trigger 30 is returned to its original position by a spring (not shown), and the feed bar 29 is returned to its original position.

At this time, the catalytic combustion exhaust gas passes through the passage formed between each catalyst, from the exhaust gas passage 12 provided at the tip of the catalytic combustion device 11, through the exhaust port 13 of the main body 1, and toward the tip of the discharge nozzle 5 to the outside. It is discharged.
Further, at this time, the exhaust gas is prevented from spreading radially by the heat retaining cylinder 11d.

[Effect of the invention] As explained above, the adhesive discharger according to the invention has the outer periphery of the oxidation catalysts 11b and 11c connected to the heat retaining tube 1.
1d is placed in parallel with the melting pipe 3, and a mixing pipe 14 is provided near the rear end of the catalytic combustion device 11 to eject a mixed gas of combustion gas and air in the axial direction of the catalytic combustion device. At the same time, a catalytic combustion exhaust gas passage 12 is provided at the tip of the catalytic combustion device, and an exhaust port 13 is provided at a position facing the catalytic combustion exhaust gas passage at the tip of the main body 1, so that the catalytic combustion exhaust gas passage and the exhaust Since it is arranged on the same axis as the port 13, the mixed gas ejected from the mixing pipe flows toward the catalytic combustion exhaust gas passage 12 in the mixed gas ejection pipe 11a, so that the catalytic combustion flame spreads radially. Not only is this safe, but also the exhaust gas generated by catalytic combustion is efficiently discharged to the outside from the exhaust port 13 along with the mixed gas flow, so that the heat transfer efficiency to the melting pipe 3 can be improved. In addition, since the exhaust port 13 is bored at a position close to the discharge nozzle 5 at the tip of the main body 1 and parallel to the melting pipe 3, the exhaust gas is discharged from the exhaust port 13 in the direction of the discharge nozzle 5. , the exhaust gas can be used to keep the heat of the surface to be bonded and the adhesive discharged onto the surface to be bonded.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view showing one embodiment of the adhesive dispensing device according to the present invention, Fig. 2 A and B are a longitudinal side view and rear view showing another embodiment, and Fig. 3 A and B are further FIG. 4 is a front view illustrating the gas adjustment mechanism, and FIG. 5 is an enlarged sectional view taken along the line - in FIG. 4. 1...Main body, 2...Stick-shaped adhesive, 3
...Melting pipe, 11...Catalytic combustion device, 11a
...Mixed gas ejection pipe, 11b, 11c...Oxidation catalyst, 11d...Heat retaining cylinder, 12...Exhaust gas passage,
14...Mixing tube.

Claims (1)

[Scope of utility model registration request] A catalyst is formed on one side of the melting pipe 3 for melting adhesive which is disposed through the main body 1, and is formed by a gas jetting pipe 11a, an oxidizing catalyst attached to the outer periphery of the gas jetting pipe, and a heat retaining cylinder 11d covering these. In an adhesive discharger which melts a stick-shaped hot-melt resin adhesive by disposing combustion devices in parallel and catalytically combusts a mixed gas of fuel gas and air, and discharges the molten adhesive, the catalyst A catalytic combustion exhaust gas passage 12 is provided at the tip of the combustion device, and an exhaust port 1 is provided in the main body 1 at a position facing the catalytic combustion exhaust gas passage.
3, the catalytic combustion exhaust gas passage and the exhaust port 13 are provided.
is arranged coaxially with the catalytic combustion apparatus, and a mixing pipe 14 is disposed near the rear end of the catalytic combustion apparatus for ejecting a mixed gas of combustion gas and air in the axial direction of the catalytic combustion apparatus. Agent dispenser.