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

Abstract

A method for preventing metal micropowder in a roasting furnace from entering a picture tube when manufacturing a picture tube, the method comprising: during the manufacture of a picture tube, in the roasting process before exhausting, injecting air into the tube for replacing the gas in the picture tube The neck is covered with a magnet ring that does not lose its magnetism even at a high temperature of 600°C, and its position is in the glass bulb neck tube of the picture tube. The method of the invention can effectively absorb metal powder that can enter the picture tube, and is effective for preventing dust from entering inside and outside the air injection tube. The method of the invention is suitable for the production and manufacture of various cathode ray tubes.

Description

Method for Preventing Metal Micropowder in Roasting Furnace from Entering Picture Tube When Manufacture Picture Tube

The invention relates to a method for manufacturing a picture tube, in particular to a method for preventing metal powder in a roasting furnace from entering the picture tube when the picture tube is manufactured.

In the manufacturing process of cathode ray tubes such as color tubes, black and white tubes, and projection tubes, firing is generally performed before the exhaust process. The purpose of firing varies somewhat depending on the type of tube. The purpose of firing a color tube is to connect the front screen and the back cone through low glass powder, and to remove the organic film coated as a pre-treatment of the aluminum film. Other tubes are roasted mainly for the latter purpose.

The picture tube generally applies a high voltage of 10 to 30KV to make it operate. Although the inside of the tube is in a vacuum state, once a small foreign matter enters between the electrodes in the tube, it may cause poor insulation, and at the same time, sparks between the electrodes are prone to occur. It is an eternal task of the picture tube to prevent tiny foreign matter from entering the tube.

When the roasting furnace is heated, the maximum temperature of the picture tube is 400-450 °C, so the temperature in the furnace sometimes reaches above 500 °C. The method adopted is to move the iron mesh belt and place the rack on the mesh belt. Regardless of the method, the carrier will inevitably be rubbed at the part in contact with the furnace body to produce metal fine powder. In order to obtain the necessary temperature distribution, the furnace There is also a strong wind, and the metal powder is driven by the wind to fly around, and as a result, the chance of the metal powder entering the pipe increases.

In order to prevent metal powder from entering the tube, some places use the manufacturing method of covering the opening of the glass bulb neck tube, but this also has problems. The organic film decomposes, and once the gas generated after combustion stays in the tube, it will be adsorbed in the tube. The inner wall of the pipe, these gases will be released slowly after exhausting, which will damage the life of the pipe. Therefore generally all hope that the gas in the pipe can be replaced as far as possible in roasting, at this moment, the end of the diameter pipe is open, and the metal micropowder in the unavoidable roasting furnace enters in the pipe.

It is very difficult to reduce the metal fine powder in the roasting furnace. For example, the use of sieves can be considered, but because the metal powder is very fine, an extremely fine sieve is required, but there is no high-temperature-resistant fine sieve in reality.

In order to fully replace the decomposed gas in the tube, the air injection tube is used to forcibly inject fresh air. At this time, the air in the furnace between the fresh air tube and the air injection tube is also sucked in. The air in the furnace contains a lot of metal powder, metal The fine powder will also be brought into the tube thereupon. When no fresh air is injected, the air in the furnace will also be sucked in from the outside of the air injection tube, and the same problem will occur.

The purpose of this invention is to provide a kind of method that prevents the metal micropowder in the roasting furnace from entering the picture tube when manufacturing the picture tube, and the method of removing the magnetic metal powder with a magnet is applied in the roasting process of the picture tube, so as to effectively remove the metal powder that may enter the picture tube. The purpose of metal powder.

The purpose of the present invention is achieved like this:

A method for preventing metal micropowder in a roasting furnace from entering the picture tube when producing picture tubes, characterized in that the method comprises:

When manufacturing picture tubes, in the roasting process before exhausting, the neck of the air injection tube used to replace the gas in the picture tube is fitted with a magnet ring that does not lose its magnetism at a high temperature of 600°C. The position of the magnet ring is at the bottom of the picture tube. Inside the glass bulb neck.

The magnet ring used in the method contains the elemental composition of aluminum, nickel, cobalt, copper, iron.

In a preferred embodiment, the positioning between the air injection tubes of the magnet ring is realized by an elastic positioning piece, and the elastic positioning piece is made of heat-resistant metal material.

The elastic positioning piece has a dry piece, which is in the shape of a bent strip. Its upper end surface is spot-welded on the outer wall of the air injection pipe, and its lower end is bent outwards and warped against the upper end surface of the magnet ring, so that the magnet ring is axially positioned on the Air is injected onto the outer neck of the tube.

，高度20±0.2mm。During implementation, the diameter of the magnet ring is: for a picture tube with a diameter of 22.5mm, the outer diameter of the magnet ring is Φ12.5±0.5mm, and the inner diameter is Φ

, height 20±0.2mm.

，高度20±0.3mm。For a picture tube with a diameter of 29.1mm, the outer diameter of the magnet ring is Φ16.2±0.5mm, and the inner diameter is Φ14.2mm

, height 20±0.3mm.

The effect of the present invention is; Owing to adorning on the neck of the air injection pipe the magnet ring that can withstand high temperature 600 ℃, can effectively absorb the metal powder that may enter the pipe, this method is helpful for preventing dust from the inside and outside of the air injection pipe Entry is effective, and the method of the present invention is applicable to the production and manufacture of various cathode ray tubes.

The preferred embodiment will now be described in conjunction with the accompanying drawings.

Fig. 1 is the working schematic diagram of the method of the present invention.

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

Fig. 3 is an embodiment of the positioning sheet.

Fig. 1 is that when the workpiece picture tube 1 is roasted in the baking furnace, the air injection tube 2 stretches into the cavity of the picture tube 1, and the fresh air 3 enters in the air injection tube 2, and also enters the air 4 containing metal micropowder simultaneously, and replaces the air 4 in the picture tube. Air 5, the feature of the method of the present invention is that on the neck of the air injection pipe, a magnet ring 7 that does not lose its magnetism even at a high temperature of 600°C is housed.

For example, the magnet ring 7 is shown in Fig. 1 by tightening the magnet ring 7 at the opening of the glass bulb tube neck tube 6 of the picture tube. Described magnet ring 7 is that hollow cylinder shape sees Fig. 2, and its inner hole is equipped with locator 8, and this locator is made of heat-resistant elastic material, and Fig. 3 shows a kind of embodiment of locator 8, and elastic locator has Several pieces, in the shape of bent strips, the upper ring surface of which is spot-welded to the outer wall of the air injection pipe, and the lower end of which is bent outward and warped against the upper surface of the magnet ring, and the magnet ring is axially positioned on the outer neck of the air injection pipe 2 superior.

During implementation, the number of the positioning elements 8 may be 2-3 pieces.

Claims (5)

1. A method for preventing the metal micropowder in the roasting furnace from entering the picture tube when making a picture tube, characterized in that the method comprises; When manufacturing picture tubes, in the roasting process before exhaust, the neck of the air injection tube used to replace the gas in the picture tube is fitted with a magnet ring that does not lose its magnetism even at a high temperature of 600 ° C. The position of the magnet ring is at the bottom of the picture tube. Inside the glass bulb neck. 2. the method for preventing the metal micropowder in the calciner from entering the picture tube according to claim 1 is characterized in that the ring magnet used in the method contains the elemental composition of aluminium, nickel, cobalt, copper, iron. 3. the method for preventing the metal powder in the roasting furnace from entering the picture tube according to claim 1 is characterized in that the positioning between the magnet ring and the air injection pipe is realized by elastic positioning pieces, and the elastic positioning pieces are used Made of heat-resistant metal material. 4. The method for preventing the metal powder in the roasting furnace from entering the picture tube according to claim 3, characterized in that the elastic positioning piece has several pieces, which are in the shape of a bent strip, and its upper end surface is spot welded on the outer wall of the air injection tube , the lower end of which is bent outwards and warped against the upper end surface of the magnet ring, and the magnet ring is axially positioned on the outer neck of the air injection pipe. 5. The method according to claim 1, characterized in that the diameter of the magnet ring is: for a picture tube with a diameter of 22.5 mm, the outer diameter of the magnet ring is Φ12.5 ± 0.5 mm. , inner diameter Φ , height 20±0.2mm; For a picture tube with a diameter of 29.1mm, the outer diameter of the magnet ring is Φ16.2±0.5mm, and the inner diameter is Φ14.2mm

, height 20±0.2mm.

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