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What are the control schemes of electronic truck scale in metering system?
Code for control of weighing process of truck scale

1.

application area

This specification is applicable to the weighing room under the jurisdiction of measurement control of Shuikoushan Nonferrous Metals Group Co., Ltd..

Weighing range

(

0~50

)

Tons,

(

0~80

) tons,

(

0~ 120

) tons, the accuracy level of the truck scale is Grade III, and the truck scale is used to weigh the bulk materials of the company.

Control of weighing process.

2.

Identification of measurement process

2. 1

Name of measurement process: Weighing process of truck scale for bulk materials entering and leaving the company.

2.2

The basis of the measurement process: the operating procedures of all electronic scales in the ground scale.

2.3

Verification basis of truck scale:

JJG539- 1997

Verification regulation of digital indicating scale

three

Measurement requirements:

Measurement parameter name

Weighing range

solve

maximum permissible error

environmental conditions

heavy

quantity

(

0~50

)

t

10 kg

30 kg

Normal temperature, all-weather

heavy

quantity

(

0~80

)

t

20 kg

60 kg

Normal temperature, all-weather

heavy

quantity

(

0~ 120

)

t

20 kg

60 kg

Normal temperature, all-weather

4.

Weighing principle

Placing the weighed object or loaded vehicle on the weighing platform,

The weight is transferred to the load cell,

The sensor converts the weight signal into

Electrical signal, the display instrument receives the electrical signal,

Display weight data after operation. The compute collects information relate to weighing,

Yuxian

Instrument communication collects weighing data, processes and stores information, and prints weighing sheets.

five

Control elements and requirements of measurement process

5. 1

Requirements for measuring equipment

Name of measuring equipment

Weighing range

Display division value

accuracy grade

Electronic truck scale

(

0~50

)

t

10 kg

three-level

Electronic truck scale

(

0~80

)

t

20 kg

three-level

Electronic truck scale

(

0~ 120

)

t

20 kg

three-level

5.2

Measurement environment requirements

Environmental conditions: outdoor normal temperature, indoor (

10~30

)℃, power supply fluctuation ≤

10%

, there must be no vibration that affects inertia.

5.3

Operator skill requirements

Weigher must have a high school or technical school education, understand the working principle of weighing, be familiar with computer operation, and pass the examination.

Take up the post after passing the training and examination.

5.4

operation sequence/order

( 1)

Check around the truck scale platform, and don't get stuck by stones, coal blocks and other sundries. After the weight is stably placed on the weighing platform,

Should not contact with the periphery of the scale.

(2)

Turn on the power supply, and the indicator light performs self-inspection. After entering the weighing state, if the zero point deviates, it should be reported to professional maintenance in time.

Personnel. Ask if you can directly set it to zero. After zeroing, the zero identifier lights up.

(3)

Input weighing. If the object to be weighed is a vehicle driving into the weighing platform, the vehicle speed should be lower than.

5 km/h

And brake and stop as slowly as possible.

Stay in the center of the scale and weigh after the car stops. When weighing, input information such as car number, save and print the weighing sheet.

(4)

Standardize the weighing and record it carefully.

(5)

Clean the platform surface frequently to keep the environment clean and tidy.