CN1051166C

CN1051166C - Method for preventing micropowder in roaster from going into kinescopes when producing kinescopes

Info

Publication number: CN1051166C
Application number: CN96106754A
Authority: CN
Inventors: 木村正通; 刘晓东; 王行军
Original assignee: Matsushita Color CRT Beijing Co Ltd
Current assignee: Matsushita Color CRT Beijing Co Ltd
Priority date: 1996-07-04
Filing date: 1996-07-04
Publication date: 2000-04-05
Anticipated expiration: 2016-07-04
Also published as: CN1143826A

Abstract

The present invention relates to a method for preventing micro powder in a roasting furnace from entering a kinescope in the manufacture of the kinescope. In the method for preventing micro powder in a roasting furnace from entering a kinescope in the manufacture of the kinescope, a magnetic iron ring which does not lose magnetism at the high temperature of 600 DEG C is arranged on a proper position on an air injection tube for displacing gas in the kinescope in a roasting working procedure before gas discharge in the manufacture of the kinescope, and the magnetic iron ring is arranged on the outer diameter of the air injection tube of a glass shell tube neck tube of the kinescope. The method for preventing micro powder in a roasting furnace from entering a kinescope in the manufacture of the kinescope can effectively adsorb metal powder possibly entering the kinescope and can also effectively prevent dust from entering from the inner side and the outer side of the air injection tube, and the method for preventing micro powder in a roasting furnace from entering a kinescope in the manufacture of the kinescope is suitable for the production and the manufacture of various cathode ray tubes.

Description

The method that stops the metal fine powder in the baking furnace to enter picture tube when making picture tube

The present invention relates to make the method for picture tube, particularly a kind of when making picture tube, the method that stops the metal fine powder in the baking furnace to enter picture tube.

In the manufacturing process of cathode ray tubes such as colored picture tube, black and white pipe, projection tube, generally to carry out roasting before the deairing step.The purpose of roasting is because of the different more or less differences of pipe kind, and the roasting purpose of colored picture tube is that the awl of the screen of front and back is linked together by low glass powder, and removes the organic film that applies as steaming the pre-treatment of aluminium film.Kind of the enforcement roasting of other pipe is mainly for back one purpose.

The high pressure that picture tube generally applies 10～30KV makes it action, although in the pipe be vacuum state, just might cause defective insulation in case enter small foreign matter between the electrode in the pipe, also strikes sparks easily between electrode simultaneously.Stopping that small foreign matter enters in the pipe is the eternal problem of picture tube.

The maximum temperature of picture tube is 400～450 ℃ during the baking furnace heating, so temperature reaches more than 500 ℃ sometimes in the stove, during a large amount of production, picture tube will be placed on the carrier that passes through certain form on the luggage carrier certainly and move in stove, the mode of generally taking is to move iron guipure, on guipure, put luggage carrier, no matter what mode, carrier will inevitably be rubbed in the part that contacts with body of heater, produce metal fine powder,, also be furnished with high wind in the stove in order to obtain necessary Temperature Distribution, metal fine powder dances in the air under wind-force drives everywhere, and the chance that the result makes metal fine powder enter in the pipe increases.

For preventing that metal fine powder from entering in the pipe, some local manufacture method that the peristome of glass-type tube neck tube is covered that adopts, but do like this problem is also arranged, organic film decomposes, in a single day the gas that the burning back produces be trapped in the pipe, will be adsorbed on tube wall, these gases are released at leisure again after the exhaust, will diminish the life-span of pipe.Therefore generally all wish the gas in the pipe is replaced, at this moment the end of caliber pipe is an opening, and the metal fine powder in the inevitable baking furnace enters in the pipe.

The metal fine powder that reduces in the baking furnace is very difficult problem, for example can consider to utilize screen cloth, but because metal powder is very fine, needs extremely meticulous screen cloth, and can not find resistant to elevated temperatures fine screen mesh in the reality.

For the decomposition gas in displacement is managed fully, adopt air injection tube to force to inject fresh air, this moment, the furnace air between fresh air conduit and air injection tube also was sucked into, contain a lot of metal fine powders in this furnace air, metal fine powder also can be brought in the pipe thereupon, when not injecting fresh air, furnace air also can be sucked into from the outside of air injection tube, identical problem occurs.

The purpose of this invention is to provide and a kind ofly when making picture tube, stop metal fine powder in the baking furnace to enter method in the picture tube, to be used in the calcining process of picture tube with the method that magnet is removed the magnetic metal micro mist, reach and remove the purpose that may enter the metal fine powder in the picture tube effectively.

The object of the present invention is achieved like this:

A kind of when making picture tube, stop the metal fine powder in the baking furnace to enter the interior method of picture tube, it is characterized in that this method comprises:

When making picture tube, in the calcining process before exhaust, the magnet ring that does not also lose magnetism when on the neck that is used for replacing the air injection tube of gas in the picture tube, being set with 600 ℃ of high temperature, the position of this magnet ring is in the glass-type tube neck tube of picture tube.

The magnet ring that uses in the described method contains the elemental composition of aluminium, nickel, cobalt, copper, iron.

In preferred embodiment, the location between the described magnet ring air injection tube realizes that by the elasticity spacer this elasticity spacer is made with the heating resisting metal material.

Described elasticity spacer has dry plate, is the bending bar shaped, and its upper surface is welded to the air injection tube outer wall, and the outside bending warpage in its lower end contacts at the upper surface of magnet ring, and with the magnet ring axial location on the outer neck of air injection tube.

During enforcement, the diameter of described magnet ring is: for diameter 22.5mm, picture tube, magnet ring external diameter Φ 12.5 ± 0.5mm, internal diameter Φ

, height 20 ± 0.2mm.

For the picture tube of diameter 29.1mm, magnet ring external diameter Φ 16.2 ± 0.5mm, internal diameter Φ 14.2

, height 20 ± 0.3mm.

Effect of the present invention is; Owing on the neck of air injection tube, load onto the high temperature resistant 600 ℃ magnet ring of energy, can adsorb the metal powder that may enter in the pipe effectively, this method is all effective from entering of the inboard of air injection tube and the outside to preventing dust, and method of the present invention is applicable to the manufacturing of various cathode ray tubes.

Now in conjunction with the accompanying drawings with preferred embodiment.

Fig. 1 is the work schematic diagram of the inventive method.

Fig. 2 is the shape schematic diagram of the magnet ring among Fig. 1.

Fig. 3 is a kind of embodiment of spacer.

Fig. 1 is that workpiece picture tube 1 is when carrying out roasting in baking furnace, air injection tube 2 stretches into the cavity of picture tube 1, enter fresh air 3 in the air injection tube 2, also enter simultaneously the air 4 that contains metal fine powder, air 5 in the displacement picture tube, method feature of the present invention is on the neck of air injection tube, the magnet ring 7 that does not also lose magnetism when 600 ℃ of high temperature are housed.

For example see Fig. 1 at glass-type tube neck tube 6 opening parts of picture tube this magnet ring 7 that is locked.Described magnet ring 7 is seen Fig. 2 for the hollow cylinder shape, its endoporus is equipped with keeper 8, this spacer is made with heat-resistant elastic material, Fig. 3 shows a kind of embodiment of keeper 8, the elasticity spacer has some, is the bending bar shaped, and its top ring millet cake is welded in the air injection tube outer wall, the outside bending warpage in its lower end contacts at the upper surface of magnet ring, and the magnet ring axial location is on the outer neck of air injection tube 2.

During enforcement, the quantity of described keeper 8 can be the 2-3 sheet.

Claims

One kind when making picture tube, stop metal fine powder in the baking furnace to enter method in the picture tube, it is characterized in that this method comprises;

When making picture tube, in the calcining process before exhaust, the magnet ring that does not also lose magnetism when on the neck that is used for replacing the air injection tube of gas in the picture tube, being set with 600 ℃ of high temperature, the position of this magnet ring is in the glass-type tube neck tube of picture tube.
2. the metal fine powder in the prevention baking furnace according to claim 1 enters the method in the picture tube, it is characterized in that the magnet ring that uses in the described method contains the elemental composition of aluminium, nickel, cobalt, copper, iron.
3. the metal fine powder in the prevention baking furnace according to claim 1 enters the method in the picture tube, it is characterized in that the location between described magnet ring and the air injection tube realizes that by the elasticity spacer this elasticity spacer is made with the heating resisting metal material.
4. the metal fine powder in the prevention baking furnace according to claim 3 enters the method in the picture tube, it is characterized in that described elasticity spacer has some, be the bending bar shaped, its upper surface is welded to the air injection tube outer wall, the outside bending warpage in its lower end contacts at the upper surface of magnet ring, and with the magnet ring axial location on the outer neck of air injection tube.
5. the metal fine powder in the prevention baking furnace according to claim 1 enters the method in the picture tube, it is characterized in that the diameter of described magnet ring is: for the picture tube of diameter 22.5mm, and magnet ring external diameter Φ 12.5 ± 0.5mm, internal diameter Φ , height 20 ± 0.2mm;

For the picture tube of diameter 29.1mm, magnet ring external diameter Φ 16.2 ± 0.5mm, internal diameter Φ 14.2
, height 20 ± 0.2mm.