Screw-type hot cathode fluorescent tube and manufacturing method thereof

Abstract

The invention provides a screw-type hot cathode fluorescent tube and a manufacturing method thereof. The manufacturing method of the screw-type hot cathode fluorescent tube comprises the following steps of: bending a glass tube to form a screw shape, bubbling on the tube foot, coating fluorescent powder, roasting the tube, manufacturing a core column and a cathode, sealing the tube, arranging an exhaust pipe, exhausting, supplying mercury and arranging a cold end, wherein in the step of coating the fluorescent powder, under the condition that the tube is a dual screw-type tube, the tube and a tube fixing device pitch at an angle of less than or equal to 45 degrees towards one direction simultaneously from the horizontal state, and the tube rotates and is heated to perform setting treatment on powder slurry while revolving with a powder coating machine.

Description

technical field [0001] The invention relates to a spiral hot cathode fluorescent lamp tube and a manufacturing method, and the invention is especially suitable for manufacturing a spiral hot cathode fluorescent lamp tube with an ultra-fine diameter. Background technique [0002] In the prior art, powder coating treatment is required in the process of processing fluorescent tubes. Fluorescent lamp powder coating is a very important process in the production process of fluorescent lamps. The reasonable thickness and uniformity of the powder layer after powder coating will directly affect the important parameters of fluorescent lamps such as light efficiency, luminous flux, light decay, life, surface brightness and even reliability. . For ordinary straight tube or U-shaped fluorescent lamps, because the tube wall is vertical and smooth, the powder slurry flows smoothly, so it is easy to control the thickness of the powder layer and obtain a uniform powder coating effect, so th...

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Problems solved by technology

However, in fact, if precise control cannot be achieved, serious problems will occur, namely: the slurry always drips when it rotates laterally with the lamp tube, and the effect of gravity makes it rotate in the direction of the lamp tube and at the same time It flows in the opposite direction, so that the initially injected powder slurry may be divided into several groups after a few laps in the lamp tube. Under the action of the oven heating, the water in the several groups of powder slurry is continuously evaporating, and finally the flow is motionless and "settled" nearby. ", powder coating without powder accumulation becomes irregular powder accumulation

This powder coating method may be a kind of optimum plan to the positive column type single helix lamp tube that unidirectional positive column type spirals, but also do not use positive column type single helix lamp tube at all except this patented technology now, but a A kind of double-helix lamp tube that bends at the center of the top of the lamp tube and then spirals to both sides in both directions. How long is the outsourcing of this lamp tube, and how long is a straight tube bent at the center of the top of the lamp tube? A short straight tube, the slurry and the wind should go from one side of the two-way spiral lamp tube to the other side and pass through it. This transition not only changes the flow of the slurry and the direction of the wind, but also to a greater extent. When a straight pipe rotates 360 degrees, it will alternate between the vertical state and the horizontal state, so the slurry that flows irregularly becomes more irregular

What is more troublesome is the screw lamp tube with feet. The distance between the two feet is generally smaller than that of the lamp tube, and it is parallel to the central axis of the lamp tube's spiral rotation. The position of the feet is always kept at a high position, and it is difficult for the powder to flow out. Even if a little powder on the upper part of the lamp tube flows into the tube feet, the feet are flat, and it is difficult for the powder to flow out immediately. If you turn it a few more times, then When the slurry is heated, it is even more impossible to move, and instead, the channels for the slurry to flow out are blocked

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