Die for preparing fluorescent lamp tube, and method for preparing lamp tube through using it

Abstract

The invention provides a die for preparing a fluorescent lamp tube, and a method for preparing the lamp tube through using it. The die comprises an upper die and a lower die, wherein the upper die and the lower die are respectively provided with an annular die cavity having surfaces clinging to each other after die locking and respectively recessing inward in order to divide each of the upper die and the lower die into a middle part, an edge part and the die cavity between the middle part and the edge part; each of the edge parts is provided with a ventilation groove enabling the die cavity to be communicate with the outside; when the die locking of the upper die and the lower die is carried out, the middle parts of the upper die and the lower die are tightly jointed, the edge parts of the upper die and the lower die are tightly jointed, the die cavities of the upper die and the lower die are communicated to form the shape of the lamp tube to be formed, and the ventilation grooves of the upper die and the lower die are communicated to form the opening of the neck of the lamp tube to be formed; and one or two of the middle parts of the upper die and the lower die are hollow, one tight jointing side of one or two of the middle parts of the upper die and the lower die is an inclined surface when the die locking of the upper die and the lower die is carried out, and the inclined surface incline to the other side from the molding curved surface of the die cavities. The inclined surface similar to an inner edge is arranged on the die in the invention to make an excess stock to be completely cut off.

Description

technical field [0001] The invention relates to a fluorescent lamp tube of a low-pressure gas discharge lamp, in particular to a mold for preparing a fluorescent lamp tube and a method for preparing the lamp tube with it. Background technique [0002] Electrodeless fluorescent lamps, low-pressure gas discharge lamps, have developed rapidly in recent years with the advancement of electronics. The shape of electrodeless fluorescent lamps is mainly rectangular and circular, and the electrodes at both ends are external. The technical difficulty in the manufacture of rectangular and circular electrodeless fluorescent lamp tubes lies in the molding of the exposed tube (outer tube). Rectangular and circular exposed tubes generally use SiO as the main component 2 and B 2 o 3 , borosilicate with a content close to or exceeding 85% to 90% of the total, and a coefficient of thermal expansion of 46 to 50×10 -7 / ℃ molybdenum group glass. This kind of glass has good electric vacuum ...

AI Technical Summary

Problems solved by technology

[0005] 2. Violating the common sense and technology of one-time processing and molding of electric light source bulbs and lamp tubes, impurities will inevitably be introduced, and in severe cases, the components of the glass will be partially destroyed

The design of the glass composition begins with the ingredients, and then it is put into the furnace after being fully mixed. Generally, there are more than 24 hours of melting, stirring, clarification, and homogenization in the furnace. Strictly speaking, for a formed bulb or lamp as a whole, It is said that the composition of its various positions is very consistent, and the impurity content is under the control range of the design standard; The thermal volatilization and evaporation of metal ions and atoms at high temperature will inevitably penetrate into the glass frit. The light one is the introduction of impurities, which will seriously change the composition of the glass and destroy the stable working temperature and mechanical strength of the electric vacuum glass.

The particularly serious problem is the butt joint processing of the tubes on both sides after the open tube is coated with powder and the tube is baked. The flame temperature is high, and most areas at both ends of the lamp tube are heated to 500 ° C ~ 800 ° C, resulting in a lot of impurity gases; The powder layer is a place where it is extremely easy to "shelt dirt and dirt", especially when the impurity gas generated at 500°C to 800°C enters the powder layer, it is not adsorbed on the phosphor particles, but sintered with the micron-sized phosphor particles Together; the temperature of the exhaust oven in the subsequent process is only about 470°C, and it is impossible to remove this part of the impurity gas source

In addition, the elements in the luminescent center of the phosphor can only be oxidized for 3 minutes below 500 ° C, and the luminous intensity is reduced; the temperature and time of the docking and secondary annealing have exceeded this limit value, and the luminous efficiency and lumen maintenance rate of the lamp tube must be greatly discounted

[0006] 3. The labor intensity of workers is high, the labor productivity is low, and it also brings dust pollution

On average, a skilled craftsman can hardly make 100 exposed tubes for eight hours a day with the above-mentioned processing techniques, and work in an environment with high flame temperature, sawing and grinding tube dust for a long time

[0007] 4. The overall pass rate is low and the cost is high

Multiple processing procedures, each procedure has losses, and the final comprehensive pass rate will inevitably decrease, which will increase the cost

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