KR920007954B1 - Ultraviolet irradiation bonding apparatus - Google Patents

Abstract

No content.

Description

UV irradiation bonding device

1 is a longitudinal sectional view of an embodiment of an ultraviolet irradiation bonding apparatus of the present invention.

2 is a sectional view taken along the line A-A of FIG.

3 is a cross-sectional view taken along the line B-B in FIG.

4 is a longitudinal sectional view of the watch case showing an example of a component to be joined;

* Explanation of symbols for main parts of the drawings

10: outside room 11: inside room

12: air passage 13: conveying belt

14: opening and closing shutter 15: partition plate

16: driving drum 17: driven drum

20: cooling 휜 21: oxygen concentration sensor

22: entrance nozzle 23: the first nozzle

24: second nozzle 30: ultraviolet transmission plate

31 UV lamp 32 Reflector

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet irradiation bonding apparatus in which at least two components are bonded by curing a photocurable adhesive by ultraviolet irradiation.

Adhesion by ultraviolet irradiation depends on the atmosphere in which the parts to be bonded are placed. In other words, when oxygen is present in the atmosphere during ultraviolet irradiation, the start of the curing reaction of the photocurable resin adhesive is inhibited, so that the time required for the reaction becomes long.

As a solution to such problems, for example, Japanese Patent Application Laid-Open No. 59-136371 (hereinafter referred to as Announcement Example 1), Japanese Patent Application No. 57-13334 (hereinafter referred to as Announcement Example 2) and Japanese Patent Application Center 57-49262 It is known to promote the curing reaction by introducing an inert gas into the ultraviolet irradiation chamber and blocking the part from the oxygen in the air as in the publication (hereinafter referred to as well-known example 3).

In the first example and the known examples 2 and 3 of the known example 1, since the entire ultraviolet irradiation chamber is made into an inert gas atmosphere, a large amount of inert gas is required. In addition, the removal efficiency of oxygen adhering to the parts is poor. Advantages In the second embodiment of the known example 1, the inert gas is blown directly to the joining portion, so that oxygen adhered to the component can be efficiently removed.

However, since the second embodiment of the known example 1 simply blows inert gas from the upper part of the part, for example, the main part of the part is opposed to the conveyance belt, so that the oxygen of the part is not removed and the curing reaction is performed. There is a problem in that the speed is slow and in some cases, only uncured or semi-cured state even after a long ultraviolet irradiation. This problem is a problem common to all of the first embodiment of the known example and known examples 2 and 3.

In addition, in the above known example, no consideration is given to the control of the oxygen concentration in the ultraviolet irradiation chamber, and since the parts are gradually sent into the ultraviolet irradiation chamber, an uncured component of the adhesive is generated when the oxygen concentration is above the limit. have. Moreover, all the said well-known examples always supply a fixed amount of inert gas in an ultraviolet irradiation chamber. Therefore, when a large amount of inert gas is supplied to shorten the waiting time at the start-up, an unnecessarily large amount of inert gas is unnecessarily supplied during normal operation and it becomes inefficient. On the contrary, when the supply amount of inert gas is reduced, there is a problem in that the waiting time at the start is long.

In addition, about the unnecessary heat of an ultraviolet lamp and cooling of components, well-known example 1 has no consideration. In addition, in the known example 2, the components and the reflector are directly cooled by a cooling tube, and thus there is a problem that transparency of the light emitter of the ultraviolet lamp is lost due to the accumulation of a large amount of heat emitted from the ultraviolet lamp. In addition, since the liquid is used for cooling, the structure is complicated and it is necessary to have a complete seal structure to prevent leakage. In well-known example 3, since cooling is performed only by the drain blower, the cooling efficiency of an ultraviolet lamp and components was not enough.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ultraviolet irradiation bonding apparatus that can solve various problems of the prior art.

That is, the configuration of the present invention for solving the problems of the prior art is installed in the outer chamber so that an air passage is disposed inside the outer chamber, and an air passage is formed from the lower side of the ultraviolet lamp to the outside, and half of the parts An inner chamber having an entry approach and an exit approach formed at the inlet and the outlet, respectively, and an ultraviolet transmission plate installed on the inner chamber in such a manner as to cover an opening formed on an upper surface of the inner chamber, and the interior of the chamber from the carry-in approach to the carry-out approach. And a conveyance belt in which a conveyance belt path is disposed so as to be located, a nozzle for supplying inert gas into the inner chamber, an air passage formed outside the inner chamber, and cooling means for sending air around the ultraviolet lamp. At least two components overlapping each other with a photocurable adhesive therebetween by the conveyance belt. Sending to the ultraviolet radiation applying apparatus for curing the adhesive is irradiated by the UV lamp.

In particular, in the present apparatus, the belt is formed in a net form, and at least one nozzle is provided on one side of the path of the belt so that inert gas is blown from one side of the conveyance belt to the other side. UV irradiation bonding apparatus.

In this apparatus, in addition to the nozzle, a purge nozzle for ejecting a large flow rate and a high pressure inert gas is provided in the indoor chamber, and an oxygen concentration sensor for detecting an oxygen concentration in the interior chamber is detected. The apparatus for ultraviolet irradiation bonding, characterized in that the purge nozzle is controlled by a signal.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. An inner chamber 11 extends in the horizontal direction in a substantially central portion of the outer chamber 10, and air passages 12 are formed on both sides of the inner chamber 11. The inner chamber 11 is provided with a carry-out profession 11a and a carry-out approach 11b at right and left sides. The opening of the carry-out proch 11b is narrowly formed in the range which the conveyance belt 13 and the component on this conveyance belt 13 can pass. The opening of the carry-in approach 11a is formed in such a size that the illuminometer for measuring the illuminance of the ultraviolet-ray lamp 31 mentioned later can be inserted in the interior chamber 11. Then, the inlet opening / closing shutter 14 is installed at the inlet portion of the carry-in pouch 11a. When the inlet opening / closing shutter 14 is in the lowered position, the conveyance belt 13 and the parts placed on the conveying belt 13 are allowed to pass. It constitutes a possible interval. On the lower surface of the inner chamber 11, a partition plate 15 having left and right openings is fixed. The conveying belt 13 is formed in a mesh shape, and the outer chamber 10 is disposed so that a path is located between the inner chamber 11 and a return path between the inner chamber 11 and the partition plate 15. It is provided over the driving drum 16 and the driven drum 17 disposed on the outside of the.

Cooling fans 20 are installed on the outer wall of the inner chamber 11. In addition, an oxygen concentration sensor 21 is provided adjacent to the carry-out approach 11b in the inner chamber 11. In addition, an inlet nozzle 22 is provided at the lower portion of the belt 11a of the inner chamber 11 to prevent the inflow of oxygen by injecting an inert gas. The first nozzle 23, the second nozzle 24, and the purge nozzle 25 are respectively disposed on the lower surface side of the conveyance belt 13 in the inner chamber 11 to eject inert gas such as nitrogen gas upwards. The first nozzle 23 and the second nozzle 24 are installed on the side of the carry-in approach 11a. The inlet nozzle 22 has a pressure of about 2 kg / cm 2, a flow rate of about 2 l / min, the first nozzle 23 has a pressure of 1 kg / cm 2, a flow rate of 3 l / min, and a second nozzle 24 has a pressure. The 1 kg / cm 2, flow rate 4 L / min, and the purge nozzle 25 are configured to eject inert gas at a pressure of about 3 kg / cm 2 and a flow rate of about 10 L / min.

The pressure and flow rate of the inert gas in this embodiment are conditions for maintaining the oxygen concentration at 0.1% or less (regulated value) and economically using the inert gas.

In addition, the pressure and flow rate of the inert gas and the concentration setting of the oxygen concentration sensor can be arbitrarily adjusted.

The inner chamber 11 has an opening 11c on the upper surface thereof, and covers the opening 11c so that the ultraviolet ray transmitting plate 30 such as quartz glass and pyrex glass can be detachably attached to the upper surface of the inner chamber 11. It is. The ultraviolet lamp 31 and the reflecting plate 32 are provided in the outer chamber 10 above the ultraviolet ray transmitting plate 30. The ultraviolet lamp 31 and the reflecting plate 32 are fixed to the exhaust duct 33 extending outward of the outer chamber 10 in a shape covering them. An exhaust fan (not shown) is provided in the exhaust portion 33a of the exhaust duct 33. In addition, each of the air inlets 10a and 10b is formed below the outer chamber 10 and in the vicinity of the inner chamber 11 of the outer chamber 10, and the suction fans 34 and 35 are respectively provided in the air inlets 10a and 10b. ) Is installed.

An import belt 40 is installed on the driven drum 18 side of the ultraviolet irradiation bonding device having such a configuration, and a delivery belt is provided between the carry belt 40 and the driven drum 18 to smoothly flip the parts. 41 is installed. On the side of the carry-in belt 40, an applicator 42 for applying a photocurable adhesive to a part is provided. In addition, a discharge belt 43 is installed on the driving drum 16 side, and a chute 44 is installed between the discharge belt 43 and the driving drum 16 to smoothly pick up the parts.

Next, the operation will be described. As an example, the case of the watch case 1 which joins the body 2 and glass 3 of the watch case with the photocurable adhesive 4 as shown in FIG. 4 is demonstrated. When the ultraviolet irradiation bonding device is started, an inert gas is ejected from the nozzles 22 to 25, the ultraviolet lamp 31 lights up, and the exhaust fan and the suction fan 34 and 35 in the exhaust part 22a rotate. To start. When the inert gas is ejected from the nozzles 22 and 25, the inner chamber 11 becomes an inert gas atmosphere. When the oxygen concentration falls below a certain value, a signal is output from the oxygen concentration sensor 21, and the ejection of the inert gas from the purge nozzle 25 is stopped by this signal, and the carry-in belt 40 and the take-up belt ( 41) starts up. In addition, when the exhaust fan and the suction fan 34 and 35 start to rotate, air is sucked into the outer chamber 10 from the air suction ports 10a and 10b. This air is led to the exhaust duct 33 through the air passage 12 between the outer chamber 10 and the inner chamber 11 and discharged from the exhaust unit 33a to the outside. By this air flow, the inner chamber 11 is cooled through the cooling fan 20, and unnecessary heat of the ultraviolet lamp 31 is cooled.

As the oxygen concentration sensor, a known OXYGEN ANANLYZER MODEL LC-700M accessory manufactured by Nippon-Tokyo Engineering Co., Ltd. was used.

Then, the photocurable adhesive agent 4 is applied onto the body body 2 by the applicator 42, and the watch case 1 on which the glass 3 is placed on the main body 2 is placed on the carrying belt 40. When placed, the watch case 1 is placed on the conveyance belt 13 through the conveying belt 41 from the carry-in belt 40. Then, the watch case 1 is conveyed by the conveyance belt 13 to the carry-out approach 11b through the inside of the inner chamber 11 from the carry-on profil 11a. Since the inner chamber 11 is in an inert gas atmosphere as described above, the photocurable adhesive 4 hardens rapidly under the irradiation of ultraviolet rays of the ultraviolet lamp 31 in a state where oxygen is completely blocked. The conveyance belt 13 has a mesh shape, and the first and second nozzles 23 and 24 eject the inert gas from the lower surface of the conveyance belt 13 toward the upper surface thereof. Oxygen collected at the inner recess is also blown away.

As a result, the inner end portion 4b of the photocurable adhesive 4 is also completely blocked by oxygen, so that the inner end portion 4b is also quickly cured. As described above, the watch case 1 having the glass 3 bonded to the body 2 by the photocurable adhesive 4 is carried out from the conveying belt 13 to the carrying belt 43 through the chute 4. do.

When the oxygen concentration in the indoor chamber 11 becomes higher than a predetermined value during operation, a signal is output from the oxygen concentration sensor 21, and the purge nozzle 25 is turned on, and a large amount of inert gas is blown out. do. If the oxygen concentration is abnormally higher than a certain level, an alarm sound is generated and the carry-in belt 40 stops. When the oxygen concentration in the inner chamber 11 is equal to or lower than a certain level, a signal is output again from the oxygen concentration sensor 21 to stop the ejection of the inert gas from the purge nozzle 25 and at the same time the loading belt 40 starts. .

In this way, since the inner chamber 11 is provided in the outer chamber 10 and only the path of the conveyance belt 13 is disposed in the inner chamber 11, the inner chamber 11 can be made very small, and The communicating part consists only of the carry-in approach 11a and the carry-out approach 11b of the inner chamber 11. That is, since the capacity of the room introducing the inert gas is minimal and the leakage portion of the inert gas is small, the consumption of the inert gas is significantly reduced. In addition, since air flows around the air passage 12 and the ultraviolet lamp 31 formed outside the inner chamber 11, the inner chamber 11 is effectively cooled and the components are not overheated and the ultraviolet lamp 31 is not overheated. Unnecessary heat is also cooled.

In addition, the conveyance belt 13 has a mesh shape, and the first and second nozzles 23 and 24 eject inert gas from the lower surface of the conveyance belt 13 toward the upper surface, so that the watch case 1 As described above, even if the component has a recessed portion inside, the oxygen accumulated in the recessed portion can be removed, and the inner end portion 4b of the photocurable adhesive 4 can also be cured quickly.

As described above, the nozzles 23 and 24 having a low flow rate and the large flow nozzle 25 are provided, and the oxygen concentration sensor 21 is installed in the inner chamber 11, and the diffusion nozzle 25 is provided. ) Is controlled by the oxygen concentration sensor 21, so that the interior chamber 11 can be set to an inert gas atmosphere defined for a short time and the consumption of inert gas is extremely minimal. In addition, the oxygen concentration sensor 21 may control the carry-in belt 40. As a result, when the oxygen concentration is above a certain level, by stopping the carry-in belt 40, the parts are not sent to the conveying belt 13, and defects can be prevented in advance.

Claims (6)

An inner chamber in which an ultraviolet lamp is disposed inside, an inner chamber which is installed in the outer chamber so that an air passage is formed from the lower side of the ultraviolet lamp to the outside, and which is carried in the inlet and the outlet of the parts, respectively; An ultraviolet transmission plate provided on the inner chamber in a form covering an opening formed on an upper surface of the inner chamber, a conveyance belt having a path of a conveying belt disposed so as to be located in the discharging aproach from the carry-in proch through the inner chamber; A nozzle for supplying an inert gas into the interior chamber, an air passage formed outside the interior chamber, and cooling means for sending air around the ultraviolet lamp, and carrying at least two components overlapped with photocurable adhesives different from each other; UV light sent to the inner chamber by a belt and irradiated with the UV lamp to cure the adhesive Applying apparatus. 2. The belt is formed in a mesh shape, and at least one nozzle is disposed on one side of the path of the belt so that inert gas is blown from one side of the conveyance belt to the other side. UV irradiation bonding device. The sensor according to claim 1 or 2, wherein in addition to the nozzle, a purge nozzle for ejecting an inert gas having a large flow rate and high pressure and an oxygen concentration sensor for detecting oxygen concentration in the indoor chamber are provided in the indoor chamber. And the purge nozzle is controlled by a detection signal from the ultraviolet irradiation bonding device. The ultraviolet irradiation bonding apparatus according to claim 1, wherein an input nozzle which injects an inert gas to one side of the belt and prevents the inflow of oxygen is provided in the carry-in approach of the inner chamber. The ultraviolet irradiation bonding apparatus according to claim 1 or 2, wherein the nozzle comprises a plurality of nozzles for injecting inert gas at different flow rates. An outer chamber in which an ultraviolet lamp is disposed inside, an inner chamber which is installed in the outer chamber so that an air passage is formed from the lower side of the ultraviolet lamp to the outside, and which is carried in and out of the inlet and outlet of the component, respectively; An ultraviolet transmission plate provided on the inner chamber in a shape covering an opening formed on an upper surface of the inner chamber, and a conveyance belt formed in a mesh shape with a path of the conveying belt disposed so as to be located in the discharging aproach through the inner chamber in the carrying out proch; The first and second nozzles having different flow rates, which are arranged under the belt so that the inert gas is ejected from the lower surface of the conveying belt to the upper surface, and the inert gas having a higher flow rate and a higher flow rate than those of the nozzle from the lower surface of the conveying belt An inert gas is injected into the lower part of the belt to eject the upper surface to prevent oxygen from entering. A nozzle, an air passage formed on the outside of the inner chamber, and cooling means for sending air around the ultraviolet lamp, and at least two parts overlapping each other with a photocurable adhesive agent interposed therebetween by the conveying belt; UV irradiation bonding device for curing the adhesive by irradiation with the ultraviolet lamp.

Images