CN1019433B - Modified shrink fit implosion protection band - Google Patents

Abstract

A shrink fit implosion protection band (10), includes an angle theta extending the full circumference of the band, the panel mould match line (17) and ensures that both edges of the band contact the faceplate after the band has shrunk into position.

Description

Modified shrink fit implosion protection band

The present invention is usually relevant for the zone of fracture that prevents of cathode ray tube, and tool particularly a kind of condensation of improvement prevent the zone of fracture.

Therefore cathode ray tube is evacuated into a very low interior pressure, probably owing to be subjected to all surface generation stress that atmospheric pressure acts on pipe and break.This problem is suggested when the cathode ray tube setting prevents the zone of fracture.This belt is to be used to apply the panel dish sidewall of a compression stress to cathode ray tube, so that redistribute some strength on dish.The redistribution of the strength of dish can make the tension force in some corners of panel become minimum, thereby reduces the possibility of pipe break.In addition, if when breaking, the stress of these redistributions impels the back side of the tank tower that the glass that breaks installs towards pipe, has therefore reduced the possibility that injures near the personnel the pipe that breaks fully.

The zone of fracture that prevents of shrinking type is made a circle by a steel bar usually and is formed, and it has the shape identical with claimed panel, and the two ends of steel bar is bonded on a side of band.In some cases, the both sides that two identical steel bars are bonded on circle form described band.For these two kinds bands, the periphery of circle slightly is shorter than the periphery of panel dish.This circle is heated to and is about 300 ° to 500 ℃, so the side that the size that the coefficient of expansion of material makes circle expand into it can allow circle be looped around dish slides.When belt cools off, its shrink and tightly around dish, therefore apply and prevent to break the sidewall of required compression stress to dish.Because known the coefficient of expansion of carrying material, can be through the yield point and the thickness of control band, and control compressing force accurately.

These dishes are made in a two-piece type mould by modeling glass.Therefore the sidewall of each panel has the bar joint close, is commonly referred to the mould line of engagement.Two parts of mould engage at this place.In addition, the web wall compares thick with the openend of glass cooperation place at the thickness of dish front end joint.Angled sidewall has been improved the treatment process of model, and is easy to moulded glass dish longitudinal mode is extracted out.Therefore the glass in mould line of engagement the place ahead is offset, thereby forms a low-angle with respect to the sidewall sections of splice panel, and for example, this angle is generally about 51/2 degree.

When preventing that the zone of fracture is covered with the mould line of engagement of panel, with first edge that prevents the zone of fracture under the situation of the sidewall of the corner that can not extend beyond dish as far as possible towards the place ahead, prevent that then the zone of fracture from can obtain optimal results.Therefore, when this strap is to use shrinking type to prevent the zone of fracture, normally putting, thereby making the edge of the band that extends beyond the mould line of engagement can't always contact the side of coiling against the smooth shop of the horn shape sidewall of panel.Thereby best bursting protection and last adhesion prevent to break, and to take panel to be to finish.Therefore, need a kind of condensation and prevent the zone of fracture,, all can contact side protected panel with two edges guaranteeing that this prevents the zone of fracture.The present invention meets this demand fully.

A kind of condensation according to the present invention prevents the zone of fracture, be used to have the panel dish of cathode ray tube of the mould line of engagement of a protrusion, this dish type is β at an angle, sidewall around dish extends, this band forms the bending at a θ angle, around the whole periphery that prevents the zone of fracture, angle θ is covered with the mould line of engagement, and contacting between two edges guaranteeing to prevent the zone of fracture and the panel.

The accompanying drawing summary:

Fig. 1 prevents the top view of the zone of fracture according to a condensation of the present invention.

Fig. 2 is the cross section along the line 2-2 of Fig. 1.

Fig. 3 is the end view of the preferred embodiments of Fig. 1.

Fig. 4 is the part drawing in side sectional elevation of the side of a crt panel.

Below in conjunction with accompanying drawing the present invention is described in detail:

Fig. 1 is that the condensation of being invented prevents a preferred embodiments of the zone of fracture 10.This band 10 is rectangular configuration haply and has fillet 11.The long limit size of condensation band 10 is designated as A, and the minor face size is designated as B.For the size of present standard pipe, long limit is 4: 3 to the ratio of minor face.For this ratio, the periphery that prevents the zone of fracture is designed to than short 6 to 8 millimeters of the periphery of the dish of institute's desire protection, and therefore the side of band has been lacked 1 1/2 to 2 millimeters than the side of glass plate.Simultaneously, the inner radius r in four corners 11 equals panel corner part side radius.During heating, be with 10 expansions and can pass through panel easily, and the mould line of engagement of align panel.During cooling, these corners are at first in place, and because they are first contact points, this is with in place and appropriate adhering on the dish, and the remainder that should be with is near side wall glass simultaneously.When belt cooled off, nearly all strength was all pointed to bending area by band, and straight wall is bent to the corner of shaped form in this zone.This strength therefore is sent to the dish corner and on the panel of dish, their ratio is to be proportional to band is multiplied by band with respect to the sine value of the angle in the corner of dish tension force.Because the corner of belt is that the location is irremovable, so the long limit of band in the early stage can adjustment itself and these strength of balance.Therefore have quite partly strain to be concentrated in the bending area in corner, and these strength surpass the yield point of carrying material, settle the corner of a controllable compression stress by this, and pass and take the corner that reaches dish at band.When pipe was evacuated, atmospheric pressure can produce tension force in the corner of panel, and described compression stress then can make these tension force skews.

Device ear 12 is connected to the corner with 10, and is used for installing the decoration tank tower of pipe at television receiver, and adopts this pipe in television receiver.Be provided with some apertures 13 along diverse location with 10.These apertures 13 are used to install other assembly of television receiver, for example electronic building brick, neutralization coil and ground strip.

Fig. 2 be along the line 2-2 of Fig. 1 with 10 cross-sectional view.Be with 10 to have a bend 14, it makes it leave the plane of band with the edge that angle θ moves belt.This bend 14 is at buckled zone 22 places, stretches round entire belt 10, can be familiar with the advantage of bend 14 from Fig. 4, and this figure is the viewgraph of cross-section that the part of a protected dish is cut open.The technical process of making panel dish 16 is to utilize two moulds, and glass is molded as dish therein.Because this mould is two moulds, on the position of two bulk-breaking cooperation places of mould, can form a mould line of engagement 17, it is round the entire circumference of panel dish 16.Simultaneously, side surface 18 outside the opening part that dish 16 connection glass awls (not drawing) are located is positioned to and 19 one-tenth β angles of the upside wall that is connected panel dish 16.This β angle is generally 5.5 °, and is based on and makes manufacturing process simple and easy and use, and for example, the dish that it can use model to finish is easier to be taken out from mould.

In the technology that formerly has, when a contraction bands is placed around dish 16, band by flat be layered on dish 16 bent angle is arranged partly on 18, therefore with 10 and coil between 16 the upside wall 19, stayed one closely-spaced.According to the present invention, the angle θ of bend surpasses the β angle in 10 0.5 to 3.5 degree.Therefore, when when cooling band, two edges 20 with 10 and 21, the surface 18 and 19 of contact disc 16 respectively.When band continued cooling, it was shrunk to the type shape of dish 16, made to be drawn the surface 18 and 19 by dish 16 tightly in the almost whole surface of band.Therefore, when belt is applied to dish 16 the time, the bending area 22 with 10 aligns with the mould line of engagement 17 of dish 16, feasiblely is with 10 to be pressed on the line of engagement 17.

In Fig. 3, bend 14 extends in the whole length of the narrower side of belt 10, and as aforementioned, stretches round whole belt 10.The overlapping end of band is represented as 23 places, combines via welding or some other conventional method.Being with 10 can be as shown in fig. 1, is bonded on 24 and 25 places and is formed by two same pieces, and another kind of mode is perhaps arranged, and as shown in Figure 3, an independent strip material forms, and is bonded on a side.

After being with 10 to be joined so an individual pen, bring to and be elongated 1% to 1.5% less, to guarantee during cooling processing, reach the yield point of this strap.This elongation can be via 11 using some moulds and finish easily in the corner, and they have the radius r identical with the inboard corner of panel, can be made into required radius with the corner of guaranteeing belt.The diagonal that the mould in these corners is parallel to panel is distributing, and use hydraulic jack or in this technology available miscellaneous equipment, elongate 1 to 1.5% required distance to reach.

Claims (4)

1, a kind of condensation that is used for face-plate of a cathode-ray tube dish prevents the zone of fracture, the mould line of engagement that the evagination of a stretching, extension is arranged round the sidewall of above-mentioned disc, this mould line of engagement is between the part of aforementioned lateral wall, the outer surface of one of them part is with respect to angle beta of outer surface biasing of another part, the invention is characterized in: aforementioned band (10) comprises a sweep (14), described sweep departs from a limit (21) of described band (20) angle θ of another side of aforementioned band, towards aforesaid wall (19), and fully around stretching around the aforementioned band, it is overlapping that aforementioned angle θ surpasses angle beta and aforementioned sweep and aforementioned mould line of engagement (17), with contacting between two edges guaranteeing aforementioned band and the above-mentioned disc.

2, the condensation according to claim 1 prevents the zone of fracture, and it is further characterized in that aforementioned θ angle is bigger 0.5 ° to 3.5 ° than aforementioned β angle.

3, the condensation according to claim 1 or 2 prevents the zone of fracture, it is further characterized in that, the wherein aforementioned panel dish and the aforementioned zone of fracture that prevents all have fillet (11), and the inner radius (r) of the fillet (11) of band equals the outer radius of the fillet of panel dish in fact.

4, the condensation according to claim 1 or 2 prevents the zone of fracture, and it is further characterized in that, aforementioned θ angle be positioned at aforementioned band (10) forward edge (21) near.