JPS60146428A - Manufacture of circular fluorescent lamp - Google Patents

Abstract

PURPOSE:To improve mass production and quality by manufacturing a ring type fluorescent lamp using a horizontal system. CONSTITUTION:Stems 4 and 4 are deposited simultaneously on both end openings of a straight tube type bulb 1. Inert gas is injected in the straight tube type bulb 1 from one exhaust pipe 5 and is exhausted from the other exhaust pipe 5. Activation is performed by exhausting the impure gas in the bulb and applying current to electrodes 3 and 3. Then, the straight tube type bulb is conveyed in a heating furnace 8 while it is being held horizontally and then heated until it is softened by filling it with inert gas 9 such as argon from the exhaust pipe 5 at approximately one atmospheric pressure. The straight tube type bulb 1 is curved and worked annularly by rotating and moving a curved drum 10 along the straight tube type bulb 1. The inert gas 9 in a ring type bulb 1' is exhausted and inert gas 9' such as argon and krypton and mercury, etc. are supplied. Then, the second exhaust work is completed by chipping off the other exhaust pipe 5.

Description

[Detailed description of the invention] B. Industrial application field The invention is utilized in the manufacture of annular fluorescent lamps.

BACKGROUND OF THE INVENTION Straight tube fluorescent lamps are generally manufactured using a vertical method in which the straight tube bulb is supported vertically during operations such as filling the stem into the tube and evacuation.

However, in recent years, with the aim of high-speed mass production and high quality of fluorescent lamps, the so-called horizontal method, in which straight tube bulbs are supported horizontally, has been adopted in almost all work processes. There is.

A straight tube fluorescent lamp using this method is manufactured through the following steps. That is, (AI), an enclosing step in which a straight tube bulb whose inner surface has been previously treated (fluorescent film coating, firing, etc.) is held horizontally, and a stem having electrodes at both ends of the bulb is simultaneously welded.

(A2) Inert gas is introduced into the valve through one exhaust pipe extending from one end of a straight pipe type valve, and exhausted from the other exhaust pipe extending from the other end. At the same time, the stem electrode is activated by energizing it, and then an inert gas such as argon or mercury is supplied into the straight pipe valve from one exhaust pipe to seal off both exhaust pipes ( tip-off) exhaust process.

In such a polysyntal manufacturing method, since the valve is held horizontally, the transfer between each work process is simplified, and the manufacturing speed can be increased by facilitating the transfer. Further, exhaust pipes are attached to both ends of the valve, and the inside of the valve can be cleaned at a high efficiency using the exhaust pipes. In other words, by supplying inert gas from one exhaust pipe and discharging it from the other exhaust pipe, the inside of the valve can be washed and cleaned at high speed, and impure gas can be effectively discharged. It has the characteristics of being able to produce high-quality fluorescent lamps.

On the other hand, annular fluorescent lamps generally have the following (131) to (B4)
It is manufactured in each process. That is, (Bl), a straight tube type bulb whose inner surface has been treated in advance is supported vertically, and a stem having an electrode is sequentially welded to the both ends of the bulb.

(B2), Attach the exhaust pipe led out from only one end of the above-mentioned straight valve to the exhaust head, hold one end of the valve with a chuck, suspend it vertically under its own weight, and insert it from the exhaust pipe into the valve. A heating process in which the gas is filled with an inert gas of about 1 atm (atmospheric pressure) and heated.

(83) The lower end of the straight pipe valve, which has been heated and softened, is
A process of bending a straight pipe valve into an annular shape by gripping a part of the outer circumference of a split-type bending drum and rotating and lifting the bending drum.

(B4) After evacuating the inside of the annular valve that has been T-shaped before bending and activating the electrode, an exhaust process in which an inert gas, mercury, etc. is supplied into the annular valve and the exhaust pipe is tipped.

C1 Problems to be Solved by the Invention The dipping method for annular fluorescent lamps is different from the polysyntal method and is a so-called vertical method in which the bulb is held vertically, so the bulb holding mechanism is complex and the speed is high. In addition, during bending of straight pipe valves, the suspended and supported straight pipe valves expand under their own weight, causing irregularities and cracks in the wall thickness, which causes valve breakage10 during bending. There were also quality issues. Therefore, it has been considered to manufacture ring-shaped fluorescent lamps using the same polycintal method as that used for straight-tube fluorescent lamps, but this has not yet been implemented due to the difficult process.

21 Means for Solving the Problems The present invention, in view of the realization of the polycintal method for manufacturing annular fluorescent lamps, provides a mid method for annular fluorescent lamps that makes this possible and solves the above problems. , the next (C1
) to (C5).

(CI), an enclosing step in which a straight tube type bulb whose inner surface has been treated in advance is held horizontally and a stem having an electrode is welded between both ends thereof.

(C2) A first evacuation step of evacuating the inside of the straight-tube pulp and activating the electrodes.

(C3) A heating step in which the straight pipe valve after exhaust is filled with inert gas, and the straight pipe valve is heated and softened in a horizontal state.

(C4) A step of bending the heated and softened straight pipe valve into an annular shape using a bending drum.

(C5) A second exhaust step of evacuating the inside of the curved annular valve and then supplying a desired inert gas or the like into the annular valve to seal off the exhaust pipe.

E. Each step (CI) to (C5) of Example-1 will be explained in detail with reference to FIG. First, as shown in FIG. 1 (Pl), the inner surface of the l? ``The tubular pulp (1) is held horizontally on the carrier (2)-1= and conveyed in the direction of the arrow shown in the figure. Electrode (3) (
Stem (4) with (3) (4) is simultaneously welded. An exhaust pipe (5) is attached to these two stems (4) (4) in advance, and after the stems are welded, recesses (6) for gripping during bending are provided on the outer periphery of both ends of the straight valve (1). 6) is formed. When this straight pipe valve (1) is sent horizontally to the next exhaust position, one exhaust pipe (5) enters the straight pipe valve (1) as shown in (P3) in Figure 1. Inert gas is injected into the valve, and the impurity gas inside the valve is exhausted by exhausting from the other exhaust pipe (5), and then the stem (4) at both ends is
) Activation is performed by energizing the electrodes (3) (3) through lead wires (7) (7)-m- extending from (4). Each of the above steps is the same as the steps (A1) and (A2) described above for manufacturing a straight tube fluorescent lamp using the polycintal method, and therefore, the same manufacturing equipment can be used.

Next, while holding the straight pipe valve (1) horizontally, carry it into the heating furnace (8) as shown in (P4) in Figure 1, and then gas the inert gas such as argon from the exhaust pipe (5). Fill the container with (9) at about 1 atm of atmospheric pressure and heat until softened. Filling with the inert gas (9) is carried out for the purpose of preventing contamination of the activated electrodes (3) (3) and preventing collapse of the softened straight tube valve (1) due to external pressure during bending. Ru.

Next, the straight pipe valve (1) that has been heated and softened is placed in a heating furnace (8).
As shown in FIG. 1 (P5), the four parts (6) at one end of the straight pipe valve (1) are connected to the two drums (10a) (10b) of the two-part curved drum (1o). ) is held by the claws (11) (11) protruding from the lower end of the outer periphery to combine the two drums (10a) (10b), and the combined curved drum (1o) is pushed along the straight pipe valve (1). to bend the straight pipe valve (1) into an annular shape. surface,
Prior to bending, one exhaust pipe (5) is tipped off, but if the exhaust pipe (5) is formed short, it is not necessary to tip off. The curved drum (1o) that has been dried is separated into two drums (10a) (10b) and held by the next straight pipe valve (1) coming out of the heating furnace (8). Head to.

The heating step, the bending step, and the subsequent second exhaust step are performed by holding the valve with a continuous conveyor (2°). Incidentally, the scale 1 conveying body (2') in the first exhausting process is an extension of the conveying body (2) up to the first exhausting process, or is connected to the conveying body (2). In addition, from the heating process, for example, as shown in Fig. 2, a tip burner plate (12) for tip-off and a head (13) for exhaust and gas supply are attached to the exhaust pipe (5).
), and if necessary, chuck the other end of the straight pipe valve (1) with a chuck (15).
Grip it with. This chuck (15) is used to hold the valve after bending.

Next, when the bending force is completed, (P6) and (P7) in Fig.
), as shown in (P8), first aerate the inert gas (!I) in the annular valve (1゛), then supply inert gas (9゛) such as argon or krypton, mercury, etc. After that, connect the other exhaust pipe (5) to the tip burner plate 1-(1
2) to perform tip-off and complete the second exhaust operation. In this embodiment, the exhaust pipe can be attached to both of the valves, or only to one of the valves.

As described in detail, the effects of the present invention make it possible to easily adopt the polycintal method for manufacturing annular fluorescent lamps, thereby improving mass productivity and quality. In addition, since it is possible to adopt the polysyntal method, the equipment up to the exhaust process can be used as is in the manufacturing equipment for straight tube fluorescent lamps, making it advantageous in terms of capital investment. You can choose to manufacture a straight tube fluorescent lamp or an annular fluorescent lamp, which is advantageous in terms of fluorescent lamp production management.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a valve in each step for explaining the present invention in detail, and FIG. 2 is a side view showing an example of a working head attached to the valve after the heating step of FIG. 1. (1) - Straight pipe valve, (1') - Annular valve, (
4) - Stem, (9), (9') - Inert gas.

Claims (1)

[Claims] +11 An enclosing step in which the inner surface-treated straight pipe valve is held horizontally and a stem having electrodes is welded to both ends thereof;
a first exhaust step of evacuating the inside of the straight tube valve and activating the electrode; a heating step of filling the inside of the straight tube valve with an inert gas and heating and softening the straight tube valve; and a heating step of heating and softening the straight tube valve. a second exhausting step of evacuating the inside of the curved annular valve, filling it with an inert gas, etc., and then sealing off the exhaust pipe. Method of manufacturing lamps.