KR0127474Y1 - Antiexplosion band of cathode ray tube - Google Patents

Abstract

The present invention discloses an explosion-proof band with improved welding of the end.

Conventionally, because the explosion-proof band is configured by overlapping the two ends of the band or by applying a laminate, the tensile force of the explosion-proof band is applied as a shear force to the weld nugget, so that a large tensile force cannot be imparted, and the welding end is frequently cut.

In the present invention, the butt welded to both ends of the band, the long gauze welding seam with the tensile force against the tensile force of the band to solve the conventional problem.

Description

Explosion proof band of cathode ray tube

1 is a side view of a cathode ray tube illustrating the function of the explosion-proof band.

Figure 2 (a), (b) is a side view of the main portion showing the configuration of the weld end of the conventional explosion-proof band.

Figure 3 (a), (b) is a main portion side view and a longitudinal sectional view showing the weld end of the flat explosion-proof band according to the present invention.

Figure 4 (a), (b) is a side view and a cross-sectional view showing the main end of the welded explosion-proof band according to the present invention.

* Explanation of symbols for main parts of the drawings

B, B1, B2: explosion-proof band E1, E2: end

W: welding line

The present invention relates to the production of cathode ray tubes, and more particularly to the explosion-proof band.

Cathode ray tubes focus and accelerate electron beams by means of an electron gun.

It is a device for displaying an image by selectively emitting a fluorescent surface by adding. In order to stably generate and accelerate the electron beam, the inside of the cathode ray tube must be maintained in a high vacuum state, thereby exhausting and sealing the inside of the cathode ray tube at the final stage of manufacture.

The completed cathode ray tube bulb is deformed as indicated by the dotted line in FIG. 1 due to the large vacuum stress generated by the pressure difference between the inside and the outside of the tube. That is, the face (P) and the funnel (F) are deformed inward, and the skirt (S) is deformed outward. Such a vacuum stress is supported by the strength of the bulb T1 itself, but there is a risk that the bulb T1 is collapsed by an initial defect or an external impact of the bulb T1. In order to prevent this, the explosion-proof band (B) is wound around the outer periphery of the skirt (S) with a high tensile force, and a method of providing a tensile force to the explosion-proof band (B) is generally a tension (tension) method and a heat shrink (shrinkage) method. It is roughly divided into.

Either way, a steel band of a predetermined length is wound in a loop shape to weld both ends to form an explosion-proof band B. FIG. 2 (a) shows a planar explosion-proof band B1, which is formed by overlapping both ends E1 and E2 of the band with each other and forming a nugget formed by resistance welding such as spot welding; Explosion-proof band B1 is formed by N).

Meanwhile, an explosion-proof band having one side folded to increase the tensile strength of the explosion-proof band is also used. In this case, as shown in FIG. 2 (b), a lap plate L is formed on both ends E1 and E2 of the band. In addition, the explosion-proof band B2 is formed by resistance welding of this laminated plate L and the both ends E1 and E2 of a band.

However, in such a conventional explosion-proof band (B1, B2), both ends (E1, E2) are joined by only the nugget (N), both ends (E1, E2) of the band by the tension as the arrow of the band The force exerted on this nugget N from is the shear force. As is well known, steel is not only weaker in shearing force than tensile or compressive force, but also has a small cross-sectional area of nuggets (N) that resists it, and the tensile strength of explosion-proof bands (B1, B2) is very weak. Problem occurs. In particular, when the welding conditions are inappropriate when welding resistance, the problem that the explosion-proof band (B1, B2) is cut at the welding end is more frequent. Therefore, the tensile force that can be applied to the explosion-proof bands (B1, B2) is also limited to the strength of the weld end it was not possible to effectively prevent explosion.

In view of such a conventional problem, an object of the present invention is to increase the strength of the weld end to provide an explosion-proof band with improved tensile strength.

Explosion-proof band of the present invention for achieving the above object is characterized in that the butt welding by bonding both ends of the band (butt).

Specific features and advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the attached drawings.

In Figures 3 (a) and (b), the flat explosion-proof band B1 is constructed by butt welding the two ends E1 and E2 of the band to each other. That is, both ends E1 and E2 of the explosion-proof band B1 of the present invention overlap each other as shown in FIG. 2 (a) or the required length as shown in FIG. 2 (b), that is, it is shorter than the outer length of the panel. Instead, they are brought into contact with each other at an exact required length corresponding to the outer length of the panel, and the welding line W also has a long girth.

As such, a preferred method for butt welding both ends (E1, E2) of the band to each other is inert gas arc welding or upset welding such as MIG or TIG, or flash butt welding. welding). When the explosion-proof band (B1) of the present invention is banded by the heat shrink method, any welding method is not limited. However, when the band is banded by the tensile method, it is welded on the outer periphery of the panel's skirt so that heat input and welding are required. Small time welding methods should be used.

On the other hand, in the case of the folded explosion-proof band (B2) shown in Figs. 4 (a) and (b), it is possible to perform double-sided butt welding as needed. In the case of double-sided butt welding, the banding must be made by a heat shrink method, so that the folded explosion-proof band B2 can also be joined by single-sided butt welding, if necessary.

As described above, according to the present invention, since the weld end of the explosion-proof band is joined by the entire welding line of the end instead of the nugget, the joining area is notably increased, and the action force is not the shear force but the tensile force. Accordingly, the tensile strength of the explosion-proof band is significantly increased, so that a large tensile force can be given without fear of cutting, thereby enabling efficient explosion-proof.

Therefore, the present invention has a great effect on improving the safety and productivity of the cathode ray tube.

Claims (2)

In the explosion-proof band configured by joining both ends of the band to each other and wound with a large tensile force on the skirt of the cathode ray tube, the both ends (E1, E2) are joined by butt welding with each other butt welding. Explosion proof band. The explosion-proof band of a cathode ray tube according to claim 1, wherein the butt welding method is any one of inert gas arc welding, upset welding, or flash butt welding.