JPS6042575B2 - Fluorescent coating baking equipment for fluorescent lamps - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a fluorescent coating firing apparatus for a fluorescent lamp.

When manufacturing fluorescent lamps, a phosphor suspension consisting of a phosphor, a solvent, and a binder is applied to the inner surface of a glass tube, the solvent is dried, and then the coated glass tube is heated. Passage through a furnace and heating is required to burn off the binder and bake the phosphor onto the inner surface of the glass tube.

Conventionally, this kind of fluorescent coating baking apparatus is shown in Fig. 1a and b.
As shown in the figure, a glass tube 2 coated with a fluorescent suspension is mounted on a plurality of rotating and moving cylindrical rollers 1, and is heated from above by a heat source such as a radiant burner. By this method, the binder is burned out and a fluorescent coating is baked on the inner surface of the glass tube 2.

However, in the fluorescent coating firing apparatus configured as described above, the entire length of the glass tube 2 is always in contact with the cylindrical roller 1 for rotating and transporting the glass tube 2. Since the heat of the tube 2 is transmitted through the cylindrical roller 1 and escapes to the outside, there is a drawback that the thermal efficiency of heating and firing is not good.

Furthermore, since it has a large number of cylindrical rollers 2, usually 100 to 200, installed in parallel, the fluorescent coating baking device has a large size and a complicated structure. . Therefore, not only does it require a large floor space for installing the firing device, but it also has the disadvantage of being difficult to maintain and inspect. The purpose of this invention is to improve the above-mentioned drawbacks, and it is possible to save energy by improving thermal efficiency, and to reduce the cost of equipment by making the shape of the fluorescent coating baking device more compact. Furthermore, the present invention provides a fluorescent coating firing apparatus for fluorescent lamps that requires less floor space for installation, is structurally simple, and is easy to maintain and inspect.

An embodiment of the present invention will be described below based on FIGS. 2A and 2B. In the figure, 3 and 3 are a pair of units installed in parallel to each other in a heating furnace (not shown) and rotating synchronously in the same direction. A plurality of pawls 4 are implanted at predetermined intervals on the outer periphery of the conveyor plate made of circular metal. Reference numeral 5 denotes a ring-shaped metal mounting table which is provided on the side surface of the transport plate 3 and has a larger diameter than the transport plate 3 on which the glass tube 2 coated with the fluorescent suspension is placed, and 6 is this mounting table. It is an annular guide made of a metal rod placed above.

In the fluorescent film baking apparatus constructed in this way, first, the glass tube 2 whose inner surface is coated with the phosphor suspension is placed perpendicularly on the mounting table 5, and then the conveyor plate 3 is placed. When rotated, the glass tube 2 rotates on its own axis while being supported between the claws 4 and is guided by the guide body 6 and transported, and when passing through the heating furnace, is placed above or below the mounting table 5. The glass tube 2 is heated by a heat source (not shown) such as a radiant burner or an electric heater, and the binder in the coating film applied to the inner surface of the glass tube 2 is burned and removed. A fluorescent coating is baked onto the inner surface. In addition, in the fluorescent coating baking apparatus of the above-mentioned embodiment, the processing capacity is 2.
Thermal efficiency of 400 units per hour reduces thermal energy consumption by approximately 30% to 35% compared to conventional equipment with the same processing capacity as shown in Figure 1.
% reduction.

Further, although the conveying plate 3 in the above embodiment is circular, it may be annular, and it goes without saying that even if the guide body is band-shaped, it will exhibit the same function as in the above embodiment. As described above, in this invention, both ends of a glass tube coated with a phosphor suspension are supported by a pair of mounting tables, and the glass tube is supported between pawls to guide the glass tube. Since the device is conveyed while being guided by the rollers, it does not require a large number of cylindrical rollers of 10 mm to 200 mm as in the conventional device shown in Fig. 1, which simplifies the structure and makes maintenance and inspection easier. Moreover, since the device itself is circular, it requires less floor space for installation and can be made more compact.Also, since the contact area between the glass tube and the device is extremely small, the amount of heat escaping outside the glass tube is greatly reduced. Another effect is that the heat efficiency is extremely high. Note that if a heating furnace is provided to cover the transport plate, the mounting table, and the guide, the glass tube can be heated over the entire circumference of the transport plate, resulting in even better thermal efficiency.

[Brief explanation of the drawing]

1A and 1B are perspective views and side views of the main parts of a conventional fluorescent coating baking apparatus for a fluorescent lamp, and FIGS. 2A and 2B are perspective views of the main parts of an embodiment of the present invention. FIG. 1 and a side view of the same. In the figure, 2 is a glass tube coated with a phosphor suspension;
3 is a conveyance plate, 4 is a pawl, 5 is a mounting table, and 6 is a guide body.

Claims (1)

[Claims] 1. A circular or annular conveyor plate installed in parallel in the heating furnace and rotating synchronously with a plurality of pawls planted at equal intervals on its outer periphery; A large-diameter circular or annular mounting table, an annular guide provided concentrically above the mounting table, and both ends of a glass tube whose inner surface is coated with a phosphor suspension are placed between the above-mentioned claws. This glass tube is placed perpendicularly on the above-mentioned mounting table so that it can be inserted into the glass tube, and as the conveying plate rotates, the glass tube is conveyed while being guided by the guide body, and the heat source of the heating furnace causes the glass tube to be inserted into the glass tube. A fluorescent coating baking device for a fluorescent lamp, characterized in that a fluorescent coating is baked on the surface of the fluorescent lamp.