This standard specifies the acoustic performance, test methods and necessary evaluation criteria for the alarm installed on the main engine of earth-moving machinery, aiming to prevent personnel from being injured by potential dangers when the self-propelled machine (whether forward or reverse) moves. This test is carried out under the condition of the machine being stationary. JB/T 8410-1996 Earth-moving machinery forward reverse sound alarm device sound test method JB/T8410-1996 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T$410-96
EQYSO9533:1989
Wangfang Machinery
Forward and reverse sound alarm device
Sound test method
1996-09-03
Ministry of Mechanical Industry of the People's Republic of China
1997-07-01 Implementation
JB/I8410-96
This standard is formulated in accordance with [S0/TC127 "15US533:1989 Earthmoving Machinery Forward and Delayed Sound Alarm Sound Test Method" and is technically equivalent to this international standard and is equivalent to it. This standard specifies the most basic requirements and test methods for evaluating the sound performance of alarms on engineering machinery mainframes. Its purpose is to prevent people from being injured by dangerous injuries when engineering machinery is moving forward or backward: It is a key point to ensure the safety of the operation of engineering machinery products. By adopting international standards as our national standards, we can promote the installation, use and evaluation of non-standard equipment for engineering machinery, so that its evaluation criteria are consistent with international standards, so as to meet the needs of international trade, technology and economic exchanges as soon as possible. According to the provisions of 4.2.3.3 of GB/T1.1 (1993), the foreword of this international standard is retained as [S0) and the foreword of the technical standard is added as "foreword".
This standard is the standard for engineering machinery of the Ministry of Machinery Industry. The standard was proposed and coordinated by the Technical Committee for Standardization. The drafting unit of the automobile standard is the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are: ISO Foreword
5 (International Organization for Standardization) is a world alliance of national standards (member countries): The formulation of international standards is usually carried out by technical committees. Individuals or members have the right to join established technical committees and topics of interest. International organizations with connections to 1, governments and non-governmental organizations may also participate in this work. ISO works closely with the International Committee for Consultation on Good Engineering Standards (IFC) .
The draft of a national standard is adopted by the technical committee and circulated to the member countries for voting. For publication as an international standard, at least 75% of the members cast a vote.
1S! 533 was drafted by 15 / I:27 "Earth-moving machinery" SC1 "Test methods for machine performance" Annex A is an integral part of this global standard. 1 Model
Machinery Industry Standard of the People's Republic of China
Earth-moving machinery
Forward and reverse sound alarm adjustment device
Sound test method
JB/ 4109
qISO 9533:1989
This standard specifies the sound performance, test method and necessary evaluation criteria for the alarm installed on the main engine of earth-moving machinery. In order to prevent personnel from being injured by dangerous hazards when the self-propelled machine (whether forward or reverse) moves, the test is carried out under the condition of the machine working normally. The alarm performance of the relevant machine is the comprehensive function of the design of the alarm, the conditions of use, the alarm voltage, and the torque layout of the machine parts on the machine. This method is a comprehensive factor in the attenuation of the frequency of the sound alarm. This standard applies to the above machines specified in GB68. 2 Referenced standards
The texts contained in the following standards constitute the text of this standard through reference in this standard. At the time of publication of the standard, all versions are valid. When the standard is revised by the department, the parties to the old standard should discuss the adaptability of the following standards to the new standards. GB 3785-83
Gn8498-87
GB359168
GB/T 13325-1
G/T 13B02-92
Electrical and acoustic properties and test methods for earth-rock machinery Basic types of earth-rock machinery
Machinery driver's seat fixed point
Basic criteria for temporary radiated noise of machines and equipment at the operator's position (engineering level) General method for measuring temporary radiated noise of engineering machinery Determination of external vehicle radiated noise under test conditions GB/T16710.2-1996
GB/T16710,31996 Fixed test point for earth-rock machinery at the operator's position 3 Definitions
This standard applies the following definitions in GB13325.GBT13802: 3.1 Standard enclosure
Imagine a rectangular enclosure containing the machine, excluding all working equipment and attached working components, such as bucket, push plate, backhoe bucket, loosener and supports, etc.
3.2 Forward and backward alarms
The alarm installed on the main engine of the ten-way machine can prevent personnel from being injured by potential dangers during the strong movement of the machine, etc., and it does not affect the driver.
4 Only the device
! The capacitor sound plate or the noise measuring plate with equal accuracy and frequency response shall not exceed 13 times, so as to minimize the directional deviation of the product. The product and its contact are selected in the field of the test object, and its comprehensive sensitivity does not change significantly. The instrument shall meet the requirements of type 1 specified in B 3785. The accuracy of the 42-meter standard is above .5lB,
4. Wind sheet: In some test conditions, wind is required. As long as the wind speed does not affect the A-weighted sound source by more than ±0.5dB when the wind speed is zero, the JB/T 841-96 may be selected. 4. Other wind speed and direction indicators for measuring the environment should be reduced by ±10% under the recommended maximum test wind reduction. 4.5 Engine speed indicator with an accuracy of ±2% of the displayed engine speed 4.6 Measuring ambient temperature with an accuracy of ±7°C. Note: For test monitoring, see 5.1. 5 Test environment 5.1 Test area The test wind area should be clear and reflective. There should be no reflective objects or reflective surfaces such as buildings within 3 meters around the microphone or drum. The test area of ​​the microphone shall be a large and dense concrete or green ground. For details, please refer to the provisions of GB13802 and GB16710.2. Humidity, temperature, atmospheric pressure, and sensitive shelter shall all meet the limits specified in the equipment. 5.2 Noise During the test, the sound level of the sound source other than the main machine, including the effect of wind, shall be at least 10B (A) lower than the lowest sound level of the measured sound source. 5.3 Climate conditions When it rains, sleet, or there is snow on the ground or the ground, the test shall not be carried out. 5.4 Wind The wind speed of the test site should be less than BⅡ/>. If the wind speed exceeds [/s, the microphone network should use a wind shield and make appropriate compensation for the wind or the shadow as calibration.
6 Machine Test Preparation
6.1 Engine
In the machine's own noise test, the temperature of the machine should be stable, the engine should be running at the highest no-load speed, and the transmission should be in neutral. When conducting temporary adjustments, the engine is allowed to run at a low speed or shut down. 6.2 Supplementary
The main working device should be equipped and placed in the normal operating position of ADamm ± 50m above the test site level. Test method
7.1 Specification
According to the provisions of Table A1 in Appendix A, measurements should be taken and recorded at the relevant specified positions of the machine (points 1 to 8 in Figure A1, plus point 9).
When measuring, the sounder should be moved along the center of the 9 positions specified in Appendix A. 7.2.1 For each test position, use an appropriate dynamic or automatic device to move the microphone (long axis perpendicular to the rotation plane) along a circle with a radius of 260mm ± 25mm, and the rotation plane is 20° ± 25° with the vertical plane (through the detector position) perpendicular to the horizontal axis of the front or rear of the machine, and record the highest value measured. In order to simplify the manual rotation of the microphone, this standard recommends moving in the vertical plane (0°), and the optimal rotation speed is r/tmin ± 6.251/min. The rotation center of each microphone position shown in Figure A1 should be 1.2m ± 0.05m above the reference ground plane (GRP).
7.2.2 For each alarm test in A1, test and record the sound volume in the following two states. The method is as follows: when facing the torque converter, the hand is horizontally extended from the front, and the radius is fixed. The radius is the diameter of a vertical plane through which the torque converter passes. 1) The sound level meter is fast-weighted; 2) The engine is at the highest no-load speed; 3) The thruster is closed; 6) The thruster is closed; 13) The sound level meter is fast-weighted: JB/T 84I0-96; 2) The engine is at rest-idle speed or closed (check if there is a reverse voltage); 3) The alarm is open; 4) The maximum value of the calculation item is the difference between the maximum value and the maximum value. .3 The driver's seat warning force measurement method (only for the braking zone) measures and records the sound of the engine and the alarm tube, and the measurement is carried out with an A weighting, through a 25TW horizontal shield microphone with a diameter of 260m (its long axis is more than the rotation plane). Its rotation plane is based on the horizontal plane at 635m ± 20mml above the SIP (seat calibration point) specified in GB8591. The microphone can be held by the test person in the driver's seat, or by a mechanical rotating device installed in the driver's seat to rotate the sensor along the outline of the figure. The transmission speed is 1s/min ± 0.25r/miml, refer to the provisions of GA/T16710.3.
7.4 Evaluation standard
Calibration 7.1~7.3 When conducting the test, the standards specified in 7.4.1 to 7.4.3 shall be met. 7.4.1 Reverse alarm - external test
At any test position (see 1) the A-weighted sound pressure level of the push alarm test shall be equal to the A-weighted sound pressure level at the maximum no-load speed sample point (see 7.2.2a)" 7.4.2 Delayed alarm - driver's position test During the alarm test, the A-weighted sound pressure level measured at the driver's position shall not be greater than the maximum no-load speed alarm condition. The A-weighted sound pressure measured at the time of alarm should be at least 3 dB higher than the A-weighted sound pressure measured at the time of alarm.
7.4.3 External test of forward alarm
--Generally speaking, the A-weighted sound pressure of the forward alarm at position 8 in Figure A1 should be at least 0 dB higher than the A-weighted sound pressure at the maximum no-load speed of the machine.
AT alarm accumulator
Alarm accumulator manufacturer,:
Type:
Mounting position on the machine:
42 Earth-moving machinery
Type:
Serial number:
Engine maximum speed
Working device:
Example alarm
Driver's cab or rollover protective structure: yes or no*43
If existing:
OROPS: yes or no"
FROPS or driver's cab: yes or no
Door: closed or off
Computer: single switch
Information 4 Test details
JB/T 8410-96
Appendix A
Test data table
(Standard supplementary requirements)
Sensor height: Reference ground half surface (1.2m+0.0m above GRF (see 72.1). Microphone and for
13PS: curved vehicle protection structure;
RP: open vehicle protection structure
FHCPS type vehicle protection structure
! Must be in accordance with the time,
moving radius 260mm+25mln (original 7.2.1). i
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