GB/T 21296.4-2020 English PDF (GBT21296.4-2020)

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GB/T 21296.4-2020: Automatic instruments for weighing road vehicles in motion -- Part 4: Bending plate type
GB/T 21296.4-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 17.100
N 13
Automatic instruments for weighing road vehicles in motion
- Part 4: Bending plate type
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: JUNE 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Composition, classification and designation ... 6 
5 Measurement requirements ... 6 
6 Technical requirements ... 11 
7 Layout requirements ... 13 
8 Installation condition and maintenance requirements ... 16 
9 WIM system function and data requirements ... 18 
10 Test methods ... 18 
11 Inspection rules ... 19 
12 Marking, packaging, transportation, and storage ... 21 
Appendix A (Normative) Other technical requirements for additional accuracy classes
... 22 
Appendix B (Normative) Test method for bending plate sensor... 23 
Automatic instruments for weighing road vehicles in motion
- Part 4: Bending plate type
1 Scope
This Part of GB/T 21296 specifies the terms and definitions, composition, classification
and designation, measurement requirements, technical requirements, layout
requirements, installation condition and maintenance requirements, WIM system
function and data requirements, test methods, inspection rules, as well as marking,
packaging, transportation, and storage of bending-plate-type automatic instruments for
weighing road vehicles in motion (hereinafter referred to as bending-plate-type
dynamic vehicle weighing instruments).
This Part applies to the combination of multiple bending plate sensors installed in the
weighing control area in a way of embedding in and flushing with the road surface
during the dynamic driving of road vehicles; automatic weighing instruments and
systems that measure vehicle wheel loads (if applicable), axle loads, axle-group loads
(if applicable) and obtain whole loads. The bending-plate-type automatic instruments
for weighing vehicles in motion without weighing control area may refer to it for
implementation.
This Part does not apply to weighing instruments that set the single-sided bending plate
sensor to measure only the wheel load on one side, and then obtain the axle load, axle-
group load, and the whole load by multiplying.
2 Normative references
The following documents are indispensable for the application of this document. For
the dated references, only the editions with the dates indicated are applicable to this
document. For the undated references, the latest edition (including all the amendments)
are applicable to this document.
GB/T 4208-2017 Degrees of protection provided by enclosure (IP code)
GB/T 7724 Electronic weighing meter
GB/T 14250 Terminology of weighing instruments
GB/T 21296.1-2020 Automatic instruments for weighing road vehicles in motion -
Part 1: General technical specification
QB/T 1588.4 Light industry machinery - General specification for products painting
3 Terms and definitions
The terms and definitions defined in GB/T 14250 and GB/T 21296.1-2020 and the
following ones apply to this document. For ease of use, some terms and definitions in
GB/T 21296.1-2020 are repeated below.
3.1
Bending plate sensor
An integral elastic element with attached strain gauges for measuring static or dynamic
wheel forces of a wheel or axle.
Note 1: The bending plate sensor is based on bending stress, so it is called bending plate.
Note 2: The size range of the bending plate sensor involved in this Part along the driving direction
is: 30 mm~900 mm.
Note 3: When the size of the bending plate sensor in the driving direction is more than 100 mm and
less than 300 mm, it is called a small bending plate.
Note 4: When the size of the bending plate sensor in the driving direction is less than 100 mm, it is
called a narrow strip.
[GB/T 21296.1-2020, definition 3.7.4]
3.2
Partial weighing
Divide a whole vehicle into two or more parts on the same loader and weigh sequentially.
[GB/T 21296.1-2020, definition 3.3.2]
3.3
Maximum capacity of bending plate sensor
Emax
The maximum load value which can be applied to the bending plate sensor during a
single measurement and for which the measurement result error does not exceed the
maximum permissible error of bending plate sensor.
3.4
Error of bending plate sensor
The difference between the measurement result of bending plate sensor and the
conventional true value of the measured load (in mass).
Note: The center of the applied load may be any position on the longitudinal centerline of the entire
bending plate sensor; and is completely applied to the bending plate sensor.
3.5
Maximum permissible error of bending plate sensor
MPEbp
Permissible limit value of error of bending plate sensor.
4 Composition, classification and designation
4.1 Composition
Bending-plate-type dynamic vehicle weighing instrument is composed of bending plate
sensor, electronic weighing meter and apron, etc. In order to meet specific system
functions, bending-plate-type dynamic vehicle weighing instrument system may also
include interface-connected axle identifier; vehicle identification devices (such as
vehicle detector, vehicle separator, vehicle license plate identifier, etc.); vehicle
guidance device; vehicle speed detection device; and vehicle contour size detection
device, etc.
4.2 Classification and designation
The classification and designation of bending-plate-type dynamic vehicle weighing
instruments are in accordance with the provisions of Clause 4 in GB/T 21296.1-2020.
5 Measurement requirements
5.1 Basic accuracy classes
5.1.1 Basic accuracy class of whole loads
Bending-plate-type dynamic vehicle weighing instrument is an automatic instrument
for weighing road vehicles in motion by partial weighing. The basic accuracy class of
whole loads of bending-plate-type dynamic vehicle weighing instrument is divided into
4 classes, which are represented by symbols: 1, 2, 5, 10.
5.1.2 Basic accuracy class of vehicle axle loads (single-axle or axle-group loads)
Within the nominal operating speed range, bending-plate-type dynamic vehicle
weighing instruments shall maintain the corresponding metering performance
requirements and technical requirements. When it exceeds the operating speed range,
no result will be output. Or according to the requirements of 9.3.8 in GB/T 21296.1-
2020, a violation prompt will be given.
This operating speed range can be adjusted or determined according to the test
conditions during the field weighing test.
6 Technical requirements
6.1 General technical requirements
The relevant technical requirements of bending-plate-type dynamic vehicle weighing
instruments shall comply with the provisions of Clause 6 in GB/T 21296.1-2020.
6.2 Design and production requirements
6.2.1 Overall requirements
The design and production of bending-plate-type dynamic vehicle weighing
instruments shall meet the requirements of Clause 7 of GB/T 21296.1-2020.
6.2.2 Structural design
The structural design shall take into account the possibility and durability of
manufacture, inspection, transportation, installation, disassembly, use, and maintenance,
etc.
6.2.3 Overload capacity
In order to ensure that the metering performance is maintained during the service cycle,
the structural design of be...