JPS6115546B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for measuring tension in an explosion-proof cathode ray tube;
In particular, the present invention relates to a tension measuring method for measuring the tightening force of a steel band in the reinforcing process of cathode ray tubes.

Generally, cathode ray tubes implode due to external impact, and in order to prevent this implosion (explosion proof), steel bands or only steel bands are usually placed around the entire circumference of the cathode ray tube panel via a metal plate, that is, a rim band. It is wrapped tightly and tightly. This is to prevent the cathode ray tube from expanding temporarily before it implodes due to the occurrence of cracks or the like. In reality, reinforcement for explosion protection has a configuration as shown in FIG. That is, in FIGS. 1a and 1b, 1 is a cathode ray tube, and an adhesive made of double-sided adhesive tape or thermosetting resin (not shown) is adhered to the outer peripheral surface of the panel of the cathode ray tube 1. A rim band structure 2 made of a metal plate is wound around. Then, a set attachment lug 3 to be fixed to the television cabinet is fixed to the corner of the rim band structure 2 by welding or the like, and a steel band 4 is attached to the outer peripheral surface side of the rim band structure 2 including the outer surface of the set attachment lug 3. After winding the wire and tightening it with a predetermined great force, both ends were welded or caulked to fix it.

In addition, as another example, as shown in FIG. 2, the set mounting lug 3 is adhered to the corner of the outer peripheral surface of the panel of the cathode ray tube 1 with adhesive, and the outer peripheral surface of the panel including the outer surface of the set mounting lug 3 is attached. After a steel band 4 was wound around the belt and tightened with a predetermined great force, both ends of the steel band 4 were tightened and fixed with crimp seals 5.

However, in the cathode ray tube having the above configuration, various methods have been used to measure the clamping force of the steel strip 4, but the measurement accuracy may be poor in destructive or non-destructive tests, or the measurement may be difficult. This method has drawbacks such as requiring more time than a predetermined amount of time.

Therefore, an object of the present invention has been made to eliminate the above-mentioned drawbacks, and it is possible to instantly and accurately measure the tightening force of all steel strips in the process of tightening the steel strips, and to directly measure the tightening force of the steel strips. It is an object of the present invention to provide a method for measuring tension that allows the measured value to be read at the same time.

In order to achieve this purpose, the tension measuring method according to the present invention provides a groove with high dimensional accuracy in the set mounting lug, inserts a gauge rod into the gap between the groove and the steel strip, and compresses the gauge rod. The value measured in force is taken as the tightening force of the steel strip. The method for measuring the tension of an explosion-proof cathode ray tube according to the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a perspective view of a main part of a cathode ray tube and its device for explaining an example of a method for measuring tension in an explosion-proof cathode ray tube according to the present invention. The same symbols as in FIGS. 1a and 1b and FIG. 2 are the same elements, so a description thereof will be omitted. In the figure, set mounting lugs 6 are provided at the four corners of the panel of the cathode ray tube 1, as shown in FIG. A steel band 4 is wound around the outer circumferential surface of the panel including the outer surface of the set attachment lug 6, and is pulled with a predetermined tension to fix both ends of the steel band 4 with clamp seals 5. Thereafter, a metal insertion rod 9 attached to the air cylinder 7 via the compression load cell 8 is inserted into the gap between the concave groove 6a of the set attachment lug 6 and the tightened steel band 4 using the air cylinder 7. In this case, as shown in the cross-sectional view of the corner of the cathode ray tube in FIG.
A gap having a curved surface is formed, and an insertion rod 9 having a semicylindrical cross section is inserted into the gap having a curved surface.
The structure is such that the insertion force (compression force) is directly applied to the insertion rod 9. Then, this compressive force is detected by the compression load cell 8, its output is input to the amplifier 10 for amplification, and the tension of the steel strip 4 is instantaneously measured by making the meter 11 display analog or digital display based on the output. This allows the converted value to be read directly.
In this case, all of these series of operations are performed on a tightening machine for the steel band 4.

As explained above, according to the tension measurement method according to the present invention, the tightening force of the steel strip can be directly measured with high precision at the same time as the tightening process of the steel strip. An extremely excellent effect can be obtained by being able to perform the process automatically.

[Brief explanation of the drawing]

Figures 1a, b and 2 are perspective views, front views, and perspective views of essential parts of an example of a conventional explosion-proof cathode ray tube, and Figure 3 illustrates an example of the tension measurement method according to the present invention. A perspective view of the main parts to explain an example of a method for measuring the tension of an explosion-proof cathode ray tube.
FIG. 4 is a perspective view of a main part showing an example of a set attachment lug, and FIG. 5 is a sectional view of a main part of a corner of a cathode ray tube for explaining an example of a method for measuring tension in an explosion-proof cathode ray tube according to the present invention. 1... Braun tube, 2... Rim band structure, 3... Set mounting lug, 4... Steel band, 5... Crimp seal,
6... Set mounting lug, 6a... Concave groove, 7... Air cylinder, 8... Compression load cell, 9... Insertion rod, 1
0...Amplifier, 11...Meter.

Claims (1)

[Claims] 1. In an explosion-proof cathode ray tube in which a steel band is wound around the outer circumferential surface of a cathode ray tube panel through a lug that is attached to a television set and is tightened with great force, a groove is provided in the lug, and a gap between the groove and the steel band is A method for measuring tension in an explosion-proof cathode ray tube, characterized in that a tension measuring gauge rod is inserted into the tube, and the value measured at the insertion force of the measuring gauge rod is taken as the tightening force of the steel strip.