JPS6028097B2 - Discharge lamp exhaust system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing discharge lamps such as poppy lamps and optical lamps, and more particularly to an improvement in an exhaust apparatus for discharge lamps.

The structure of a conventional exhaust system will be explained using the schematic diagram of the exhaust system shown in FIG. In the figure, 1 is an exhaust machine, and 2 and 3 are conveyors for transporting workpieces (glass tubes). The exhaust machine 1 is constructed by arranging a large number of exhaust heads 6 shown in FIG. Hereinafter, the overall operation of the exhaust system for the light lamp shown in FIG. 1 will be briefly explained together with the operation of the exhaust head 6 shown in FIG. 2. A glass tube 4 having an exhaust pipe 7, which is a workpiece, is transported from the previous process by a conveyor 2, and is loaded into the exhaust head 6 of the exhaust machine 1 by a loading device 5 installed between the exhaust machine 1 and the transport conveyor 2. will be installed on the

The attached glass tube 4 has its exhaust pipe 7 kept airtight by the elastic body 8 of the exhaust head 6. As is generally well known, the glass tube 4 in the exhaust machine 1, including the exhaust head 6, passes through predetermined processes such as heating, exhaust, mercury dripping, gas filling, and tip-off while going around the exhaust machine 1. The evacuated glass tube is transferred to the transport conveyor 3 by an unloading device 9 installed between the exhaust machine 1 and the transport conveyor 3.
and transported to the next process. Here, the glass tube 4 tipped off at the head station A of the exhaust machine 1 is unloaded at the head station B as described above.

On the other hand, the exhaust pipe 7 remaining in the exhaust head 6 has one end 10
is sealed, so by operating the lever 11 of the exhaust head 6 at the head station C,
After loosening the elastic body 8 and bringing the inside of the exhaust head 6 to atmospheric pressure,
The exhaust pipe 7 is extracted by an exhaust pipe extraction device (not shown). The exhaust head 6 from which the exhaust pipe 7 has been removed reaches the head station E via the empty head station D. Here again, as mentioned above, the exhaust head 6 is loaded with a glass tube 4 having an exhaust pipe 7. However, in the configuration of the conventional exhaust device described above, if the glass tube 4 was not on the conveyor 2, the exhaust head 6 would be exposed to atmospheric pressure. Then, the exhaust head 6 goes around the exhaust machine 1 with the lower part of the exhaust head 6 left open. As a result, the fine mercury particles adhering to the inside of the exhaust head 6 fall from the lower entrance of the exhaust head 6 while the exhaust head 6 goes around the exhaust machine 1, and are scattered around the exhaust machine 1. There was a problem that the work ring mirror was seriously damaged. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an exhaust device for a discharge lamp that eliminates the above-mentioned problems.

In order to achieve the above object, in the present invention, in the above-mentioned exhaust system, the exhaust pipe remaining in the exhaust head is removed from the exhaust head when there is a glass tube to be attached to the exhaust head next. , the discharge lamp exhaust device is characterized in that it is held in its exhaust head when it is not present.

That is, the present invention unconditionally extracts the exhaust pipe remaining in the exhaust head after tip-off by operating the exhaust pipe extraction device 3 when the exhaust head reaches the head station where the exhaust pipe extraction process is performed. The exhaust device is configured so that the exhaust pipe removal device is operated to remove the remaining exhaust pipe from the exhaust head only when the next glass tube to be attached to the exhaust head is detected on the conveyor. It is composed of

According to the characteristic configuration of the present invention, when there is no glass tube to be attached next to the exhaust head, the exhaust pipe remaining in the exhaust head is not pulled out from the exhaust head and remains as it is. I will continue. Therefore, the exhaust head is either an exhaust pipe protruding from the glass tube, or
Alternatively, almost the entire period of the head schedule of the exhaust machine will be occupied by one of the remaining exhaust pipes after tip-off. Therefore, the fine mercury particles attached to the exhaust head do not fall or scatter outside the exhaust machine, but are mostly collected in the exhaust pipe that remains inside the exhaust head, dramatically improving the working environment. can be improved. Hereinafter, the present invention will be explained in detail using the schematic diagram of the exhaust device shown in FIG. 1 and the sectional view of the exhaust head shown in FIG. As described in the explanation of the structure and operation of the conventional exhaust device, the glass tube 4 having the exhaust pipe 7 from the previous process is conveyed by the conveyor 2 which rotates intermittently in the direction shown by the arrow 15 and is boiled.

Next, the transport conveyor 2 is moved by the loading device 5 installed between the transport conveyor 2 and the exhaust machine 1, which is composed of a plurality of exhaust heads 6 and rotates intermittently in the direction shown by the arrow 16.
The glass tube 4 transported is attached to the exhaust head 6 at the head station E of the exhaust machine 1. At this time, the lever 11 of the exhaust head 6 has already been loosened, and the glass tube 4
The exhaust pipe 7 protruding from the exhaust head 6 is inserted from the lower end opening portion of the exhaust head 6 to a predetermined position. And lever 11
is rotated by a drive mechanism (not shown) consisting of a air cylinder and a rotary roller. Then, the elastic body 8 is compressed, and the deformation of the elastic body 8 holds the exhaust pipe 7 inserted into the exhaust head 6 so as to keep it airtight. Thereafter, the operation from head station F to head station Z includes predetermined steps such as heating, exhausting, dropping mercury, and filling with inert gas, as is well known. Here, the operation of the exhaust head 6 in the mercury dropping process will be described. When the exhaust head 6 reaches the head station where mercury is to be dropped, the electromagnetic coil 17 is excited. Then, the plunger 18 made of a material that is easily magnetized is magnetized and attracted in the direction of the electromagnetic coil 17. A recess 19 provided in a portion of the lower end of the plunger 18 contacts the mercury 20. Next, when the excitation current of the electromagnetic coil 17 is cut off, the plunger 1
Since the force to attract the mercury 8 is lost, the plunger 18 returns to its original position due to gravity, and the recess 19 causes the plunger 18 to absorb the mercury 2.
A small amount of mercury separated from 0 is dripped into the glass tube 4 via the funnel 21 and the exhaust pipe 7. At this time, dent 19
The mercury that has fallen from the funnel 21 swells on the inner wall surface of the funnel 21 and enters the exhaust pipe 7 while rolling, so that the inner wall surface of the funnel 21 is covered with atomized mercury.
In addition, the exhaust process and inert gas filling process are performed using the rubber tube 22.
It is done via.

Next, the exhaust pipe 7 is tipped off at head station A, and the exhausted glass tube 4 is tipped off at head station B. It is transferred onto the transfer conveyor 3 by the loading device 9 and is transferred to the next process.
What has been described so far is the configuration of the conventional exhaust system,
The operation is exactly the same, and the feature of the present invention lies in the operation and configuration of the head station described below.

The operation at the head station C is to extract the exhaust pipe 7 remaining in the exhaust head 6 after tip-off using an exhaust pipe extractor (not shown) consisting of an air cylinder and a chuck mechanism.

In the conventional exhaust system, when the exhaust head 6 reaches the head station C, the lever 11 is unconditionally rotated to release the compressive force of the elastic body 8 and release the exhaust pipe 7 from being held by the elastic body 8, as described above. After setting the inside of the exhaust head 6 to atmospheric pressure,
The exhaust pipe 7 was extracted from the exhaust head 6 by an exhaust pipe extraction device. In contrast, in the present invention, when the exhaust head 6 located at the head station C reaches the head station B via the empty head station D, the glass tube 4 to be attached next to the exhaust head 6 is placed on the conveyor 2. A detection device 12 such as a switch detects whether or not the lever exists in a corresponding position, and a detection signal from the detection device 12 drives a control circuit 24 to rotate the lever 11 and operate the exhaust pipe extraction device. It controls the That is, when the exhaust head 6 holding the remaining exhaust pipe 7 reaches the head station C from the head station B, if the detection signal from the detection means 12 is "glass tube present", the control circuit 24 controls the lever 11. The remaining exhaust pipe 7 is extracted from the exhaust head 6 by rotating and operating the exhaust pipe extraction device, and when the exhaust head 6 reaches the head station E, a new glass tube 4 is attached to the exhaust head 6.

Furthermore, when the exhaust head 6 holding the remaining exhaust pipe 7 reaches the head station C from the head station B,
When the detection signal from the detection device 12 is "no glass tube", the control circuit 24 interlocks the lever 11 from rotating and from operating the exhaust alarm extractor. As a result, when there is no glass tube 4 to be attached to the exhaust head 6 next, the exhaust pipe 7 remaining in the exhaust head 6 will not be pulled out from the exhaust head 6 and will continue to maintain its state as it is. Become. Therefore, the exhaust head 6 is either an exhaust pipe 7 protruding from the glass tube 4, or
Alternatively, one of the remaining exhaust pipes 7 after tip-off will occupy almost the entire period of the head schedule of the exhaust machine. Therefore, the fine mercury particles adhering to the inside of the exhaust head 6 fall to the outside of the exhaust.
Most of the waste is collected into the exhaust pipe 7 remaining in the exhaust head 6 without being scattered, and the working environment can be dramatically improved. And more preferably,
The exhaust head 6 moves in response to the above-mentioned "no glass tube" detection signal and moves from the head station FL to the exhaust station A, such as exhaust, mercury dripping, inert gas filling, and tip-off. Predetermined processes such as
All operations performed are interlocked by operating the control circuit 25. For the evacuation and inert gas filling steps, the rubber tube 22 is crushed and interlocked using a pinch cock 13 consisting of a flip-flop mechanism and two air cylinders. That is, the exhaust head 6 is made to go around once with the function of the exhaust head 6 completely stopped, and when the exhaust head 6 reaches the head station C again, the above-mentioned operation is performed depending on the presence or absence of the detection signal from the detection device 12. conduct. In other words, the exhaust head 6 retains the remaining exhaust pipe 7 and all functions are stopped.
When the glass tube reaches the head station C, if the detection signal from the detection device 12 is "glass tube present", the control circuit 24,
All interlocks are released by the interlock control circuit 25, and the remaining exhaust pipe 7 is removed from the exhaust head 6. At this time, most of the mercury that had adhered to the inner wall surface of the funnel 21 in the exhaust head 6 was removed from one end 1 of the remaining exhaust pipe 7.
The mercury particles collect as mercury particles 14 in the exhaust head 6 and are collected together with the remaining exhaust pipe 7 without being scattered outside the exhaust head 6. Further, if the detection signal from the detection device 12 is "no glass tube", the control circuit 24 and the interlock control circuit 25 will not release the interlock of the exhaust head 6 and will cause the exhaust machine 1 to go around again. Become. Therefore, at the end of the work, all exhaust heads 6 are sealed by the remaining exhaust pipes 7 after tip-off. Further, even during idle operation after work or at the start of work, mercury falling and scattering from the exhaust head 6 can be prevented, so the work environment can be dramatically improved. Furthermore, since the inside of the exhaust head 6 is not exposed to atmospheric pressure when there is no glass tube or at the end of the work, the vacuum characteristics, which are an important factor in manufacturing a light lamp, are improved, and the characteristics of a light lamp are improved. Additional benefits can also be obtained, such as having a positive impact. As described above, the discharge lamp exhaust system according to the present invention can greatly reduce the fall and scattering of mercury from the exhaust head.

As a result, the working environment around the exhaust system can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an exhaust device for a discharge lamp according to the present invention, and FIG.
The figure is a sectional view of the exhaust head in FIG. 1. 1. ．． ．． ．． ．． ．． Exhaust machine, 3... Conveyor,
4... Glass tube, 5... Load device, 6... Exhaust head, 7... Exhaust pipe, 8... Elastic body, 9... Ann Load device, 11... Lever, 12... Detection device, 13... Pinch cock device, 17... Electromagnetic coil, 18...
Plunger, 19...dent, 20...mercury, 21...
...Funnel, 22...Rubber tube. Chrysanthemum J Diagram 2

Claims (1)

[Scope of Claims] 1 Glass tubes with exhaust pipes are attached to a plurality of exhaust heads one after another, and after predetermined processes such as exhaust, mercury dripping, gas filling, and tip-off are performed in sequence, the next glass tube with exhaust pipe is installed. In an exhaust system configured to release the restraint of the exhaust pipe remaining in the exhaust head after the tip-off process and extract the remaining exhaust pipe from the exhaust head in preparation for the installation of the exhaust head, By adding a detection means for detecting the presence or absence of the above-mentioned glass tube with an exhaust pipe to be attached to the device, only when the above-mentioned detection means detects the presence of the above-mentioned glass tube with an exhaust pipe to be attached next. An exhaust device for a discharge lamp, characterized in that the remaining exhaust pipe in the exhaust head is released from the restraint, and the remaining exhaust pipe is extracted from the exhaust head. 2. It is characterized in that all subsequent operations of the various steps in the exhaust head are stopped only when the detection means does not detect the presence of the glass tube with exhaust pipe to be attached to the exhaust head next. The exhaust device for a discharge lamp according to item 1. 3. The exhaust system comprises a plurality of exhaust heads, and
an exhaust machine that sequentially performs predetermined processes such as exhaust, mercury dripping, gas filling, and tip-off; a first conveying means for supplying the glass tube with an exhaust pipe to the exhaust machine; 2. The exhaust device for a discharge lamp according to claim 1 or 2, characterized in that the exhaust device comprises a second conveying means for receiving the discharge lamp, and the detecting means is provided at a predetermined position of the first conveying means.