GB/T 21939-2008 English PDF

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GB/T 21939-2008: Earth-moving machinery -- Warning devices for slow-moving machines -- Ultrasonic and other systems
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21939-2008	274	Add to Cart	3 days	Earth-moving machinery -- Warning devices for slow-moving machines -- Ultrasonic and other systems	Valid

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Basic data

Standard ID: GB/T 21939-2008 (GB/T21939-2008)
Description (Translated English): Earth-moving machinery -- Warning devices for slow-moving machines -- Ultrasonic and other systems
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: P97
Classification of International Standard: 53.100
Word Count Estimation: 14,187
Date of Issue: 2008-06-03
Date of Implementation: 2009-01-01
Adopted Standard: ISO/IR 9953-1996, IDT
Regulation (derived from): National Standard Approval Announcement 2008 No.9 (Total No.122)
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 standard specifies the method used to evaluate system performance monitoring, reversing the machine behind the minimum scope of monitoring, visual and auditory information, and system self-test features of the driver. This standard applies to GB/T 8498 defined the reverse speed is less than equal to 5km/h, and the vision in line with GB/T 16937. 2-1997 the lateral visibility depending on the scope of category �� (see GB/T 16937. 2-1997 in 4. 4. 3) depending on the scope and visibility of the class �� (see GB/T 16937. 2-1997 in 4. 5. 3) machine.

GB/T 21939-2008: Earth-moving machinery -- Warning devices for slow-moving machines -- Ultrasonic and other systems

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Earth-moving machinery. Warning devices for slow-moving machines. Ultrasonic and other systems ICS 53.100 P97 National Standards of People's Republic of China GB/T 21939-2008/ISO /TR9953.1996 Moving machinery machine low speed warning device Ultrasonic and other systems (ISO /IR9953.1996, IDT) Posted 2008-06-03 2009-01-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is identical with ISO /T R9953.1996 "low-earth-moving machinery and other machinery ultrasonic alarm system" (English Version). This standard is equivalent translation ISO /T R9953.1996. For ease of use, this standard made the following editorial changes. The term --- the "Technical Report" to "this standard"; --- Instead of using the decimal point as a decimal point ",". ","; --- Delete ISO /T R9953.1996 Foreword. Appendix A of this standard is a normative appendix. The standard proposed by China Machinery Industry Federation. This standard by the national earthmoving machinery Standardization Technical Committee (SAC/TC334) centralized. This standard is drafted by. Tianjin Institute of Mechanical Engineering. Participated in the drafting of this standard. Guangxi Liugong Machinery Co., Ltd., Sany Heavy Industry Co., Ltd. The main drafters of this standard. Yan , Wu Hongli, Lin JR, Yang Jun, Yi Xiaogang. GB/T 21939-2008/ISO /TR9953.1996

Introduction

This standard describes that the detection is installed on the machine and a set of reference necessary qualified alarm device /. Purpose is to alarm when the operator's line of sight was straight direction machine parts (eg hood) blocked to prevent the machine down Personal car was seriously hurt. When the machine is self-reversing, the system provides the machine with someone or obstacle path audible and visual alarm signal to the driver. After all of the currently available methods of assessment, the organization responsible for occupational safety experts and think through the following methods to reduce the matter Behind it is the occurrence of the most effective, that is, from the cab is connected to the visual/audio alarm device ultrasonic sensors or other similar machine monitoring system Area. Technical requirements and tests for low-speed machine backup alarm device covered by this Standard has been prepared by ISO /T C127/SC2, the Technical Committee Member organizations will include equipment manufacturers, earthmoving machinery manufacturers, and organizations representing the driver responsible for occupational safety. Require manufacturers and tester Structure of the requirements of this standard to present their experience. Therefore, we should focus on the following. a) Technical Committee in accordance with the views of experts, followed by detection means can not be executed independently. Only combined with the corresponding model, by optimizing Monitoring area to test accident prevention features. This should be mandatory measurement programs. b) detecting means for reversing safety issues not generally relates to an electrical connection or other protective machinery sharp edges, but the reliability of operation (such as There should probably include a self-test). Requirements should be focused on these issues. GB/T 21939-2008/ISO /TR9953.1996 Moving machinery machine low speed warning device Ultrasonic and other systems

1 Scope

This standard specifies the method for evaluating the performance monitoring system, reversing the machine behind the minimum scope of monitoring the driver's visual and auditory channel Interest and self-test features of the system. This standard applies to GB/T 8498 defined reverse speed equal to less than 5km/h, and the field of vision in line with GB/T 16937.2-1997 Depending on the range of lateral visibility category Ⅲ (see GB/T 16937.2-1997 4.4.3) and a rearview visibility range category Ⅲ (see GB/T in 4.5.3) machines 16937.2-1997.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB 1251.1 workplace Auditory danger signal danger signal (GB 1251.1-1989, eqv ISO 7731. 1986) GB 4208 housing protection (IP Code) (GB 4208-2008, IEC 60529.2001, IDT) GB/T 8498 Earth - moving machinery - Basic types - Identification and terms and definitions (GB/T 8498-2008, ISO 6165.2006, IDT) GB/T 10125 artificial atmosphere corrosion test salt spray test (GB/T 10125-1997, eqv ISO 9227.1990) GB/T 16937.2-1997 moving machinery Perspective evaluation method (eqv ISO 5006-2.1993) ISO 13766.2006 Earth - moving machinery - Electromagnetic compatibility

3 Terms and Definitions

The following terms and definitions apply to this standard. 3.1 When reversing, the monitoring area behind the vehicle through visual and auditory signals the driver within the scope of monitoring the position of the object system. Monitoring system System includes elements as defined in 3.1.1 ~ 3.1.3. 3.1.1 Element in the monitoring area object detection. 3.1.2 Analysis of the sensor signal, and the self-test is converted into a corresponding signal to the element indicating device. 3.1.3 Passed to the driver's visual/audio alarm signaling element, the signal corresponding to the distance and area related. 3.2 Defining a machine in the three-dimensional region, divided into warning area, the main regional police and the collision area (see Figure 1). GB/T 21939-2008/ISO /TR9953.1996 ......

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