GB 27701-2011 English PDF

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GB 27701-2011: Mechanical safety of cathode ray tubes
Status: Obsolete

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Basic data

Standard ID: GB 27701-2011 (GB27701-2011)
Description (Translated English): Mechanical safety of cathode ray tubes
Sector / Industry: National Standard
Classification of Chinese Standard: L38
Classification of International Standard: 31.100
Word Count Estimation: 49,495
Date of Issue: 2011-12-30
Date of Implementation: 2012-11-01
Quoted Standard: GB/T 1040.1-2006; GB/T 1040.3-2006; GB/T 2421.1-2008; GB/T 11026.1-2003; IEC 60065-2001; ISO 8510-1-1990
Adopted Standard: IEC 61965-2003, IDT
Regulation (derived from): Announcement of Newly Approved National Standards No. 22 of 2011
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This Chinese standard applies to parts and electrical installations as a holistic way of proof cathode -ray tube and cathode ray tube assembly (hereinafter referred to as"CRT"). These requirements apply to electrical or electronic measuring and testing equipment, information technology equipment, medical equipment, telephone equipment, television equipment and other similar electrical devices used in the CRT. This standard is used only for CRT panel electrical device housing constitutes an integral part of the CRT. The test methods do not apply to independent security screen protection CRT. Covered by this standard CRT is mounted within the chassis A CRT, in order to prevent the normal use conditions of the CRT rear by means of mechanical or other damage, while preventing explosion of the CRT back to fly by the user the debris damage. This standard contains requirements for the diagonal dimension greater than or equal to 76mm, and the use of the overall proof structure, to the front of the panel against the dangers posed by flying debris provide protection CRT. This standard is not used in the other direction for protection of fragments. Chapter 8 of this standard (large-size CRT), Chapter 9 (small size CRT) and Chapter 10 (with proof membrane CRT) gives the CRT conformance testing procedures and evaluation criteria given in Chapter 3 large size and small-size CRT definition.

GB 27701-2011: Mechanical safety of cathode ray tubes

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Mechanical safety of cathode ray tubes ICS 31.100 L38 National Standards of People's Republic of China A cathode ray tube mechanical safety (IEC 61965.2003, IDT) Published 2011-12-30 2012-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China issued

Introduction Ⅲ Introduction Ⅳ 1 Scope 1 2 Normative References 1 Terms and definitions 1 3 4 General requirements 3 Environmental conditions 5 3 Sampling 6 3 Test preparation means 4 and 7 Test 8 of the large size CRT 4 Test 9 small-sized CRT 7 Prestressed tension band 10 with explosion-proof membrane type CRT Test 8 11 logo 9 Prestressed tension band 12 with explosion-proof membrane type for use CRT 10 13 in accordance with Table 1 and the specification requirements of Table 2 (prestressed reinforcement band type CRT) 10 Table 14 meet regulatory requirements (explosion proof band belt prestressed proof membrane CRT) 12 3 and Table 4 Alternate heat treatment according to Table 15 (prestressed reinforcing band belt proof membrane CRT) 15 3 and Table 4 16 in accordance with Table 6 and the specification requirements of Table 7 (the CRT type adhesive frame) 16 The standard requirements in accordance with Table 17 and Table 8 of 9 (the CRT multilayer composite) 17 Additional instructions in Appendix A (informative) this standard 34 Speed Appendix B (informative) accept small ball impact of CRT glass flying debris and potential power --- ballistics and Statistical calculations 35 FIG 25 a schematic view of a chamber FIG 2 a schematic view of the ball impact test 26 FIG 27 a schematic view of an impact object 3 2.3kg Impactor impact area on the CRT 28 is typically 4 5 a schematic view of the impactor test emission FIG 28 Alternatively scratch pattern 29 of FIG. 6 explosion process temperature shock test FIG film hatch tool 29 7 8 a schematic view of high energy impact test apparatus 30 of FIG. 9 high energy impact test nail 31 FIG high energy impact test weight 10 32 FIG 11 1.4kg steel schematic impactor 33 Figure B.1 baffle height and distance to the surface of the CRT screen 35 B.2 parabolic trajectory and distance a schematic view of a predetermined glass fragments 36 of FIG. Figure B.3 emission angle, and the initial velocity of glass fragments defined force 37 Figure B.4 flying glass fragments x = L1 (solid line) or x = the initial velocity and the desired emission angle β (dashed line) at the baffle plate 38 functions l2 Figure B.5 initial velocity trajectory for the glass fragments of different emission angles when 4m/s 38 B.6 force defined glass fragments 40 of FIG. Typical dimensions B.7 glass flakes 41 of FIG. FIG B.8 initial velocity of 2m/s, excluding the emission angle of friction (dotted line) and with friction (solid lines) when the glass fragments 45 ° trajectory 41 First B.9 FIG speed 2m/s, the emission angle of the glass fragments of different cross-sectional areas of the track 42 is 45 ° Table 1 a diagonal dimension greater than 160mm prestressed reinforcement band type CRT sampling and testing programs 18 Prestressed tension band type CRT sampling and testing programs 19 Table 2 diagonal dimension of 76mm ~ 160mm Prestressed tension band type CRT sampling and test solutions in Table 3 with a diagonal dimension greater than 160mm proof membrane is 19 Table 4 diagonal dimension of 70mm ~ prestressed reinforcing band type CRT sampling and testing programs with explosion-proof membrane 20 to 160mm Film peeling strength sampling and testing program (according to Table 3 and Table 4 Test) 22 Table 5 with the explosion-proof membrane CRT Adhesive type CRT frame sampling and test plan table 6 is greater than the diagonal dimension of 22 160mm Table 7 diagonal dimension of 76mm ~ 160mm of pressure-sensitive adhesive and the outer frame type CRT sampling protocol 23 The multilayer composite CRT sampling and testing programs Table 8 is larger than the diagonal dimension of 23 160mm Table 9 diagonal dimension of 76mm ~ multilayer composite type CRT sampling and testing of programs 24 160mm Table 10 CRT size and angle interval 24 Table B.1 distance parameter value 36 Table B.2 upper and lower limits of the 37 emission angle β

Foreword

All technical contents of this standard is mandatory. This standard was drafted in accordance with rules GB/T 1.1-2009 given. This is equivalent to using the standard IEC 61965.2003 "cathode ray tube of mechanical safety" (in English). For ease of use, this standard the following editorial changes made. --- delete foreword IEC 61965, increasing their preface; --- decimal place with IEC 61965 as a decimal point "," "."; --- delete the contents of the IEC 61965 note of Chapter 1; Note --- 11 FIG. 3 "Rockwell hardness HRC > 60" to "Rockwell hardness HRC≥60", in order to define and 8.2.3.1 Consistent; --- delete the contents of the first to fourth paragraphs of IEC 61965 Appendix A, because it is about the IEC 61965 standard revision Description of content; --- Appendix B to increase the number of the formula; The IEC 61965 --- in formulas (B.1) to "may = -mg". The reason is IEC 61965 in Equation (B.1) errors, and And descriptions listed in the formula described free acceleration "g", while the use of the correct formulas in B.3, so this standard The formula was modified and used in a single vertical line identification blank equation (B.1) of the margin. The standard proposed by the People's Republic of China Ministry of Information Industry. This standard by the National Technical Committee of Standardization vacuo electrical devices (SAC/TC167). Drafted by. China Electronics Standardization Institute, Rainbow Group. The main drafters. Zhang Peng, Chen Lan, Wang Junfeng, Song Huang Ning, Wang Xin.

Introduction

This standard describes a test method for a cathode ray tube (CRT) and specification limits. The standard content may be replaced cathode ray tube GB mechanical safety requirements 8898 Chapter 18 as specified. The purpose is to publish Independent standard components so that the machine can be directly quoted. This standard contains a bursting disc attached to the panel type CRT as part of the safety requirements of explosion protection system. The tests and calculations IEC 61965 development process confirmed. a) using a standard pellet acceptability test of mechanical strength; b) the need for explosion tests When the ball hits the test may not always lead to rapid inhale. Because of this impact test is a standard test overstress, so only the results were evaluated rapid inhalation, rather than from a subsequent explosion Results of mechanical stress relief CRT system. A cathode ray tube mechanical safety

1 Scope

This standard applies to electronic apparatus as part of the overall explosion-proof manner and using a cathode ray tube and a cathode ray tube assembly (hereinafter Referred to as "CRT"). These requirements apply to the electrical or electronic measurement and test equipment, information technology equipment, medical equipment, telephone equipment, television equipment, and its Other similar electrical devices used in CRT. It only applies to the CRT face plate constituting the electrical device housing portion composed of CRT. The test method is not suitable for independent The CRT screen protective security. Covered by this standard CRT CRT means mounted in the housing, to prevent the rear portion under normal use conditions of the CRT by mechanical Or other means of destruction, while preventing at the time of the explosion can hurt your users to CRT rear side of the flying debris. Requirements of this standard contains a diagonal dimension greater than or equal to 76mm, and the use of the overall explosion-proof structure for the front panel The risk of flying debris caused provide protection CRT. This standard does not for flying debris shield in the other direction. Chapter 8 of this standard (large size CRT), Chapter 9 (small size CRT) and Chapter 10 (CRT with explosion-proof membrane) gives the CRT Conformance testing procedures and acceptance criteria, Chapter 3 gives the definition of large-size and small-size CRT.

2 Normative references

The following documents for the application of this document is essential. For dated references, only applies to the version dated paper Pieces. For undated references, the latest edition (including any amendments) applies to this document. GB /Determination of Tensile Properties of Plastics T 1040.1-2006 Part 1. General (ISO 527-1.1993, IDT) GB /1040.3-2006 Determination of tensile properties - Part 3 plastic T. Test conditions for films and sheets (ISO 527-3. 1995, IDT) GB/T 2421.1-2008 Environmental testing for electric and electronic products overview and guidance (IEC 60068-1. 1988, IDT) Aging procedures and evaluation of test results. a first portion of the insulating material having heat resistance GB/T 11026.1-2003 Electrical (IEC 60216-1.2001, IDT) IEC 60065.2001 Audio, video and similar electronic apparatus - Safety requirements (Audio, videoandsimilarelectronicap- paratus-Safetyrequirements) ISO 8510-1.1990 adhesive material adhered to a rigid material, flexible material peeling test of test samples - Part 1. 90 ° peel From (Adhesives-Peeltestforaflexible-bonded-to-rigidtestspecimenassembly-Part 1. 90degreepeel)

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 Frame type adhesive bondedframe Using preformed metal frame surrounding the outer edge of the explosion-proof structure around the CRT. Filling the gap between the tree and the metal outer edge of the CRT Fat or suitable material. 3.2 CRT diagonal CRTdiagonal Bulb maximum diagonal dimension (e.g., line fitting mold) (not including any external metal parts). 3.3 CRT housing CRTenvelope A panel or screen, a cone and a neck member consisting of structures. 3.4 Suction devacuation CRT with the process so that the internal pressure equal to the ambient pressure. 3.5 Crack fracture On the screen of one or more cracks or funnel housing cause rapid or slow inspiratory CRT. 3.6 Glass fragments glassparticle Quality than 0.025g of glass. 3.7 Explosion implosion Implosion CRT housing due to rapid and sudden collapse inward inspiration lead to burst, usually accompanied by a loud noise. 3.8 The multilayer composite CRT laminatedCRT Separate structures bonded outer shield on the CRT faceplate. 3.9 Prestressed reinforcement band-type CRT prestressedbandedCRT Metal tension band (on the outer edge CRT) tensioned to a certain Zhang Li by heat shrinking or other methods of construction. The structure is also possible Comprising a metal rim band positioned between the outer edge of the tension band with the CRT. Band or belt or the tension both of the rim portion may be in contact with Adhesive tape, or an appropriate resin material between the barrier member. 3.10 Prestressed tension band type CRT prestressedbandedCRTwithprotectivefilm with explosion-proof membrane Prestressed tension band structure (see 3.9), while a film adhered as an integral part of the explosion-proof structure on the CRT faceplate. 3.11 Stratified shaling A thin layer of glass products division status. 3.12 Chamber testcabinet A housing for receiving the test CRT. 3.13 Effective phosphor screen usefulphosphorscreen a) Color CRT. visual phosphor area when viewed from the front. b) Monochrome CRT. CRT predetermined maximum effective area of the phosphor. 3.14 Large-sized CRT largeCRT Larger than the diagonal dimension of the CRT 160mm. 3.15 Small size CRT smalCRT For a rectangular CRT, panel short-side is not smaller than the minimum size of 50mm, minimum diagonal dimension of 76mm, up to 160mm; of Circular CRT, minimum diameter of 76mm, a maximum of 160mm. 3.16 Common quality management system commonqualitymanagementsystem And the contents of the file system for producing two or more identical to the established quality management system described, and in the same centralized control System and Management under.

4 General requirements

4.1 Corrosion If a metal member due to corrosion resulting from the present standard does not meet the requirements, the need for effective means of corrosion protection. 4.2 mechanical damage In order to ensure repeatability and reproducibility of the test results, the test sample should confirm screen No visible scratches. 4.3 Handling Pre-test and post-test when handling test sample shall have safety warnings. 4.4 CRT film When the CRT as a film with a non-integral part of the explosion protection system should be in accordance with Table 1, Table 2 and Table 6 to Table 9 without film products experimenting.

5 Environmental conditions

Detection with 5.1 standard atmospheric conditions Unless otherwise specified, all measurements and tests should be carried out under standard atmospheric conditions. --- Temperature. 15 ℃ ~ 35 ℃; --- Relative humidity. 25% to 75%; --- Pressure. 86kPa ~ 106kPa. 5.2 Pretreatment Before heat treatment before or during the test, the CRT stable for at least 16h under standard atmospheric conditions (see 5.1). 5.3 Heat Treatment The heat treatment conditions in Table 1 to Table 9. After heat treatment was complete, the CRT stable for at least 24h under standard atmospheric conditions (see 5.1).

6 Sampling

6.1 sampling plan Sampling Plan Tables 1 to 9. 6.2 Number of samples Type CRT prestressed tension band and the number of test solutions in Table 1, Table 2, Table 3 and Table 4; frame type CRT adhesive see Tables 6 and 7; The multilayer composite type CRT shown in Table 8 and Table 9. Note 1. The number of bonding a film strength test sample shown in Table 5. Note 2. In addition to the number specified in the table above, the test samples should be prepared additionally. 6.3 Compliance All the same test group CRT shall meet the test requirements of the group. Otherwise, if all test groups just does not match a CRT Meets the requirement, you can, for the second set of test samples were tested for the pilot project nonconformity results to determine eligibility. in case The second test group, all CRT meet the requirements, the tubular qualified. Preparation and testing apparatus 7 7.1 scratched pattern Because of the shape and depth of the scratches may affect the force required to cause an explosion or inhale CRT, it is recommended to use a diamond or hard Carbide knife, glass cutter wheel with a small hardened steel or other similar manufacturing tool scratches. 7.2 baffle Each mask of a predetermined test procedure, by a thickness of 10mm ~ 20mm made of a material, the height of 247mm ~ 250mm, length Of 2.00m ± 0.01m. Baffle should be placed on the ground in front of the chamber in a predetermined position which is perpendicular to the center plane of a CRT front The flap side of the CRT screen in the horizontal direction toward the projection distance. Unless otherwise specified, the tolerance should be ± 10mm damper position is. In the baffle can Touching the wall between the case where the test (shown in FIG. 2 and FIG. 5), the length may be less than 2m. Such as can be covered with a blanket on the floor or ground Non-slip surface of the carpet or the like. Note. When the plane of the surface debris across a front baffle, should be considered beyond the bezel. 7.3 Installation The width of the CRT should be installed in a suitable robust construction and the size of the chamber, the chamber around the periphery of the CRT slit or opening is not 6mm larger than allowed (see FIG. 1). Should be based on manufacturer's specifications or CRT CRT CRT intended use of the front panel is attached to the chamber Front or rear. When the specification is not installed, the mounting method should preferably be mounted behind the front panel of the chamber, unless the design characteristics are not So allow installation. A top chamber opening area should be appropriate holes, close to the tapered portion. The holes should be closed during the impact test. It should have an opening at the rear or bottom of the chamber, which area is not less than 1/4 of the area of the CRT screen surface or 0.02m2, whichever A smaller value, so that the air intake when the explosion occurred. Chamber should be fixed firmly, preventing movement in the assay. 7.4 the mounting position CRT center distance should be ground 1.00m ± 0.05m.

8 large size CRT test

8.1 Mechanical strength test (impact pellets) 8.1.1 Test Procedure A diameter of 40mm ± 1mm, the inner hook includes a mass of 260g ± 15g, Rockwell hardness HRC of not less than 60 solid light Ball slide, suspended in a suitable manner, for example, with a mass of pellets and not more than 10% by mass of the hook thin metal wire or a chain. Should make Good pellets from a height calculated, like a pendulum free fall to impact energy of 5.5J ± 0.1J CRT surface. Should be perpendicular to the surface of the CRT screen Place, and with the pendulum fulcrum in the same vertical plane. Impact point on the CRT screen surface should be effective at a distance of not less than 40mm phosphor surface boundary At any point, only once the impact of each CRT. Note. The laboratory test equipment to deal with all of the uncertainty to be considered to ensure that the location of the impact point of not less than 40mm. Baffle should be placed in a plane at a distance of 1.5m where the CRT screen center (see FIG. 2). 8.1.2 Glass splash criteria If you fly in the first impact 5s glass meets the following requirements, it is determined that CRT qualified. a) at the outer baffle 1.5m, there should be no greater than the mass of a single piece of glass fragments 0.025g; b) at the outer baffle 1.5m, the total mass of glass fragments should not exceed 0.1g. 8.2 explosion test (emission impacting object) 8.2.1 Test Procedure The upper and lower surface of the CRT screen, from the screen or a boundary surface of 3mm ± 1mm fluorescence at visible region engraved scratches, scratches should 100mm ± 5mm long horizontal lines. Impact shock was a steel composition (see Example 3), a mass of 2.3kg ± 0.1kg, a Rockwell hardness of not less than 60HRC, a End is a round radius of 25mm ± 5mm. CRT should be subjected to only a single impact, within a predetermined range so as to minimize impact energy fast intake. Pendulum impact thereof should be along an arc Movement, in order to obtain the impact energy is not less than 7.0J not more than 14.0J of the sample in the test group quick intake. By the impact region to be surrounded by two concentric boundary region, the effective radius of a circle of 1/6 the height of the phosphor screen, a second round Subtracting 50mm radius is 1/2 of the effective height of the phosphor screen (see FIG. 4). In FIG. 4, if R2 is less than R1, the impact point by R1 should The determined circumference. Note. When the horizontal impact energy and impact position within a selected predetermined range, the test should be considered past experience (CRT manufactured by a particular CRT design Plant or laboratory obtained). Movement of the impactor should be limited to ensure that it enters the top of the spherical surface of the CRT screen is less than or equal to 25mm (see FIG. 5). Baffle should be placed in a vertical plane 1.0m and 1.5m ......

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