JPS6325653Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a firing apparatus for a bulb coated with phosphor.

Conventional firing equipment of this kind has a long box-shaped firing furnace with a number of rollers arranged side by side at the bottom so that they can rotate and revolve around each other, and multiple burners arranged in a staggered manner above the inside of the furnace. It is composed of During firing, the phosphor-coated bulbs are sequentially supplied onto the rollers, and as the rollers rotate and revolve, the bulbs are rotated on the rollers and moved from the furnace inlet to the outlet. The coated phosphor is fired by the radiation and the heat reflected from the roller.

Incidentally, the dimensions of the bulb vary in diameter and length depending on the purpose of use as a fluorescent lamp. For this purpose, the baking equipment is either equipped with a dedicated furnace with a roller length corresponding to the length of each valve, or the length of the roller is equal to or longer than the maximum length of the valve, and a large number of rollers are used. They were installed side by side as a general-purpose furnace so that they could be used for both long and short valves. In this case, the height of the valve was kept constant because there was no large difference in the diameter of the valve between the maximum diameter and the minimum diameter that would adversely affect the firing effect.

By the way, in a firing furnace of the type in which a burner is arranged above a roller, there is a tendency that, due to its structure, the vicinity of the tube end of the valve is not sufficiently fired compared to the vicinity of the center of the tube. For this reason, in the case of a versatile firing furnace like the latter, when firing a long bulb, the furnace has a configuration adapted to this, so by using all array burners, it is possible to Although firing can be carried out without much problem in accordance with a firing furnace dedicated to valves, the following drawbacks have arisen when firing short valves.

That is, the short bulb 1 is placed on a large number of parallel rollers 2 of the firing furnace a' as shown in FIG. This constant interval corresponds to the reference interval for long valves. Accordingly, the distance between the other tube end 1'' of the short bulb 1 and the side wall 3' of that side becomes large.On the other hand, the holder 5 of the burner 4 is held at a predetermined height above the roller, similar to a dedicated firing furnace. is fixed.
Therefore, in the conventional firing furnace that can be used for both long and short valves, one pipe end 1' of the valve 1 is located at a standard distance from the side wall 3, so that the burner holder 5 above it is positioned so that it is flush with the valve body. Although the desired firing is obtained due to slight excessive heating, on the 1'' side of the tube end, which has a wide distance from the other side wall 3', heating by the burner 4' directly above it is sufficient to dissipate heat. Therefore, in order to prevent this and to fire the end of the tube on the side with a wide gap evenly with the entire bulb, or to make it slightly overfired, conventionally the exposed roller portion 2' on the outside of the end of the tube was heated. The burners 4'' of the upper multi-row holder 5 were also ignited, adding heat radiation from the above-mentioned multi-row burners and reflected heat from the exposed roller portion 2' facing thereto. Therefore, it was necessary to use an extra burner, increasing gas consumption.

The present invention has been developed in view of the above-mentioned drawbacks of the firing apparatus which can be used for both long and short valves, and has been improved and eliminated.The following describes an embodiment of the structure shown in the drawings. Note that the same parts are designated by the same reference numerals throughout the drawings.

In FIGS. 1 to 3, a is a firing furnace, 2 is a large number of valve conveying rollers arranged in parallel at the bottom of the furnace a,
Reference numerals 3 and 3' denote both side walls of the furnace a, and these are constructed in the same way as a conventional firing furnace for both long and short valves, and the valves supplied to the firing furnace a are conveyed in a fixed direction by rollers 2 while rotating. be done. That is, for example, as shown in FIG.
The chain 6 is rotated endlessly over the entire length of the kiln, and each roller 2 engages a pinion 8 on its shaft 7 with a rack 9 over the entire length of the kiln. As a result, the valve placed on the roller 2 rotates and revolves, and is conveyed from the inlet to the outlet of the furnace. Note that the length of the roller 2 is such that a long bulb can be placed thereon. The arrangement of the rollers, their drive, and the configuration of the furnace side walls are the same as those of the conventional firing furnace with both long and short valves.

Here, in the present invention, the mounting holder 5 for the burner 4, which is mounted in parallel above the roller 2 and perpendicular thereto, is configured as follows, as in the prior art.

The holder 5 is a long object extending in the direction in which the valve is conveyed by the rollers 2, and holds the burner 4 appropriately. Incidentally, the burners 4 can also be arranged in a staggered manner. As shown in FIG. 3, each holding body 5 can be moved up and down in a single row or in groups of multiple rows by a chain 10 that acts as a traction member. The holding body 5 is driven up and down by the traction chain as described above.
This can be done with a commonly used drive mechanism such as a gear mechanism or other piston mechanism. In some cases, each burner may be individually raised and lowered together with a heat insulator that separates and holds each burner.

Now, when firing long bulbs, the long bulbs are sequentially fed onto the roller 2 whose length corresponds to the length of the long bulbs, the holder 5 above the roller is kept at the same predetermined height, and all burners 4 are ignited. do it. As a result, the ends of the tube can easily be fired to the desired degree of firing, which is equal to or slightly over-fired compared to the center of the tube.

Next, when processing a short valve 1, as shown in FIGS. 1 and 2, one of the pipe ends 1'
The valves are sequentially supplied onto the roller 2 with the base end being the same as the distance from the side wall 3, that is, the standard distance. As a result, the distance between the tube end 1'' on the side opposite to the base end and the other side wall 3' becomes much larger than the standard distance, and an exposed portion 2' is formed on the end side of the roller 2. Such a valve 1 placed on the roller 2, the upper burner 4 is connected to the tube end 1' on the reference interval side and the end burner holder 5' on the side wall 3 side with respect to the tube center. A plurality of burner holders 5 are positioned at the same height above the center of the tube and the center of the pipe as in the case of a long valve. The lower burner holders 5'' are lowered by the lifting drive mechanism, and the lowermost lower burner holder 5 surrounds the tube end 1'' as shown by the chain line in FIG.
A'' is lowered to the lowest position to serve as a side wall, and its inner burner holder 5b'' is rested at an appropriate height. Firing is performed with the burner holders 5, 5', 5'' in a stationary state.
The tube ends 1' and the tube center on the reference interval side are equally spaced or The desired firing is performed with the tube ends being slightly overfired. Then, on the other tube end 1'' side, the lowermost burner holder 5a'', which is a side wall, is not ignited, and the inner descending burner holder 5b'', which is closer to the tube end 1'', is ignited. This side wall formation prevents heat dissipation, and due to the increase in the degree of heating by the burner holder 5b'' placed close to it, this tube end 1'' is fired in the same manner as the tube end 1' on the reference interval side. In addition, as mentioned above, when using the lower burner holder, in addition to lowering the burner holder on the side wall or lowering the burner holder on the inside to ignite, the burner holder on the side wall may be lowered slightly higher depending on the firing condition of the application valve. Try to ignite while stationary, increase the number of descending burner holders, or appropriately change the degree of proximity to the tube end to achieve the desired firing, with the entire valve being evenly fired or the tube end being slightly overcooked. Make it. Further, in order to obtain the above-mentioned firing effect, the entire burner holder may be individually set to an appropriate height.

As explained above, according to the present invention, the holder disposed in the direction of conveyance of the bulb by the rollers can be adjusted up and down as appropriate depending on the length of the bulb, so that the phosphors of all bulbs of different lengths can be adjusted. can be fired effectively, and there is no unnecessary ignition of burners, resulting in significant savings in gas consumption.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view showing an example of the device of the present invention, Fig. 2 is a plan view of a part thereof, Fig. 3 is a side view of the main part showing an example of elevating and lowering the burner holder, and Fig. The figure is a schematic front view of a conventional firing furnace with both long and short valves. 1... Short valve, 2... Roller, 4... Burner, 5... Burner holder.

Claims (1)

[Scope of utility model registration request] In a firing furnace using a burner, a plurality of rollers are rotatably disposed and the bulbs are conveyed in a fixed direction by the rotation of the rollers. 1. A firing device for a phosphor-coated bulb, characterized in that a burner holder is arranged to be movable up and down, and the burner holder is equipped with a plurality of burners.