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Machinery Industry Standard of the People's Republic of China
JB/T7696.1~7696.4-95
Instruments for Construction Machinery
Published on 1995-06-20
Ministry of Machinery Industry of the People's Republic of China
Implemented on 1996-01-01
Mechanical Industry Standard of the People's Republic of China
Fuel Meters for Construction Machinery
Subject Content and Scope of Application
This standard specifies the technical requirements, test methods, inspection rules, etc. for fuel meters for construction machinery. JB/T7696.2-95
This standard applies to fuel meters that indicate the fuel level in the fuel tank of construction machinery, and other fuel meters for motor vehicles can also refer to it. 2 Reference standards
GB2828
JB/T7696.1
ZBT35001
3 Structural types and categories
Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) Pressure gauges for engineering machinery
Basic technical conditions for automotive electrical equipment
Fuel gauges are generally composed of indicators and sensors, and their structural types and categories are shown in Table 1. Table 1
4 Technical requirements
Basic parameters
Indicator
Electromagnetic
Bimetallic
Sensor
Variable resistance
Variable resistancebzxZ.net
Fuel gauges should comply with the requirements of this standard and should be manufactured according to drawings and design documents approved by the prescribed procedures. 4.2 Graduation
The graduation indicates the fuel level according to the position of the fuel gauge sensor float. In principle, there are no less than two graduations: 0 (empty) - 1/2 - 1 (full). E can also be used to indicate empty and F to indicate full.
4.3 Standard environment
18~28℃
Relative humidity
45%~75%
86~106kPs
4.4 Working environment temperature
The working environment temperature of the fuel gauge is shown in Table 2.
Indicator
Sensor
Approved by the Ministry of Machinery Industry on 1995-06-20
Effective humidity
=40～+70
40～+100
Working temperature
20~+55
-28~+100
Implemented on 1996-01-01
4.5 Appearance
JB/T 7696.295
4.5.1 The protective layer should be uniform, without obvious defects such as bubbles, spots, rust and shedding. 4.5.2 Glass and other transparent materials should not have scratches and refraction that affect accurate readings. 4.5.3 The graduation lines, symbols, numbers and other markings on the dial must be clear and complete. 4.5.4 The exposed part of the fuel gauge indicator should not have a strong glaring luster. 4.5.5 When the fuel gauge is not working, the pointer of the indicator should be below the zero scale line and can touch the zero scale line. 4.6 Mounting and plating
4.6.1 In addition to complying with the provisions of Article 4.5.1 of this standard, the paint layer should have a bright surface color and be firmly bonded to the surface of the covering. After the temperature resistance test, there should be no wrinkles or peeling. 4.6.2 The electroplating layer and chemical treatment layer should comply with the relevant provisions of 2BT35001. 4.7 Performance
4.7.1 Compatibility
The fuel gauge indicator should be used in conjunction with the fuel gauge sensor designed to match it, and the manufacturer should ensure their interchangeability. 4.7.2 Movable Part Movement State
When the measured fuel quantity changes, the float, lever and electric shock of the fuel gauge sensor shall move synchronously, flexibly and stably. The pointer of the indicator shall move smoothly without obvious jumping and jamming. 4.7.3 Basic Error
At ambient temperature, the basic error of the fuel gauge is as follows: a.
The electromagnetic fuel gauge shall not exceed ±8% of the full arc length of the scale; the bimetallic fuel gauge shall not exceed ±10% of the full arc length of the scale. b.
AB——Full arc length
4.7.4 Pointer Response Time
When the float of the fuel gauge sensor moves sharply from 0 empty position (E) to 1 full position (F), the pointer of the fuel gauge indicator shall indicate more than 90% of the full value of the scale within 1 minute.
4.7.5 Voltage Withstand
The fuel gauge indicator shall be able to withstand a voltage of 50Hz, actual sinusoidal waveform of 550V, for 1min, and its insulation shall not be broken down. In large-scale continuous production, a voltage of 660V and a duration of 1s may be used instead. 4.7.6 Temperature Impact Resistance
When the fuel gauge is subjected to a temperature impact test according to the working ambient temperature range, the absolute value of the change in its indicated value shall not exceed 10% of the full arc of the scale 9
JB/T 7696.2-95
, and shall comply with the provisions of Article 4.7.2 of this standard. 4.7.7 Humidity and Heat Resistance
The fuel gauge shall be able to withstand an alternating humidity and heat test with a high overflow concentration of 40℃ and a cycle of 6 days. After the test, it shall comply with the provisions of Articles 4.7.2 and 4.7.3 of this standard.
4.7.8 Voltage influence
When the fuel gauge is subjected to voltage influence test according to the voltage fluctuation range specified in Table 3, the absolute value of the change in its indication value shall not exceed 10% of the full arc length of the scale.
Nominal voltage
Vibration resistance
Test voltage
Voltage fluctuation range
The fuel gauge shall be able to withstand the rated and swept frequency vibration test in the three directions of up and down, left and right, and front and back. The test specifications shall comply with the provisions of Table 4, Table 5 and Table 6.
First, measure the resonance point according to the provisions of Table 4.
Pressure rate
Sweep period
According to dynamic acceleration
If there is no resonance point, conduct vibration endurance test according to the provisions of Table 5, Table 5
Pressure rate
According to dynamic acceleration
Test time h
Full amplitude
0.4 or less
4.7.9.3 When there is a resonance point, vibration test should be carried out for 1h up and down, 0.5h left and right, and 0.5h front and back according to the resonance point and the full amplitude shown in Figure 2, and then the test specified in Table 6 should be carried out.
Extreme vibration rate
JB/T7696.2-95
16. 7 33. 3 66.7 166.7 333. 4 666. 8Deep vibration frequencyH
Probe vibration plus blocking
Test timeh
After the vibration test, the fuel gauge should not be loose or damaged. The absolute value of the change compared with the indication value before the test shall not exceed 7% of the full arc length of the scale and shall comply with the requirements of Article 4.7.2 of this standard. 4.7.10 Durability
The fuel gauge shall be able to withstand 30,000 fuel level rise and fall cycles. During the test, there shall be no abnormal changes in its parts. After the test, the change in its indication value shall not exceed 7% of the full arc length of the scale and shall comply with the provisions of Article 4.7.2 of this standard. 4.7.11 Dustproof performance
After the dustproof test, the fuel gauge shall not have dust that affects the reading and shall comply with the provisions of Articles 4.7.2 and 4.7.3 of this standard. 4.7.12 Water resistance
After the water spray test, the inner surface of the glass of the fuel gauge shall not be water-permeable and shall comply with the provisions of Articles 4.7.4 and 4.7.5 of this standard. 5 Test method
5.1 Appearance inspection
During the appearance inspection, the visual inspection shall be carried out under 3001x uniform illumination and a day distance of 500mm. 5.2 Inspection of paint and plating layer
5.2.1 The appearance quality of the paint layer shall be inspected by visual inspection. 5.2.2 The adhesion of the paint layer shall be inspected by the grid method on the fully dried paint surface, that is, four lines are cut vertically and horizontally with a No. 11 or No. 12 medical surgical blade, with a spacing of 1mm between each line, to form 9 squares, and observe whether the paint layer in the squares has delamination. 5.2.3 The temperature effect performance of the paint layer shall be inspected after the temperature effect test. 5.2.4 The alternating pot heat performance of the paint layer shall be inspected after the alternating wet heat test. 5.2.5 The quality of the electroplating layer and the chemical treatment layer shall be inspected according to the method specified in Article 4.12 of ZBT35001. 5.3 Performance test
5.3.1 Test conditions
JB/T7696.2-95
When inspecting the indication value of the fuel gauge, it shall be carried out under the standard environment specified in Article 4.3 of this standard. 5.3.1.1
5.3.1.2 The installation position of the fuel gauge on the test bench shall be the same as the actual installation position in the vehicle model. 5.3.1.3 The fuel gauge indicator shall be tested in conjunction with the matching designed sensor. 5.3.1.4 The ripple voltage of the DC regulated power supply used for the test shall not be greater than 10mV. The power supply voltage during the test shall comply with the provisions of Table 7, and the accuracy of the voltmeter shall not be less than 0.Level 5.
Nominal voltage
5.3.1.5The accuracy of the standard thermometer shall not be less than ±1℃. Test voltage
Durability test voltage
14.0±0.5
28.0±1.0
5.3.1.6Except for the test of changing the indicated value and the probing test, all other test items of the fuel gauge are in a non-working state. 5.3.2Basic error test
The test is carried out on a special device, and the commercial deviation of the special device is ±2mm. During the test, it must be ensured that the height of the fuel gauge sensor float is equivalent to the actual height of the fuel filter surface when it is used. During the test, the height of the fuel gauge sensor float should be changed smoothly. Read the indicated value of the fuel gauge indicator corresponding to the float at 0, 1/2, and 1 in the order of first falling and then rising. For the electromagnetic fuel gauge indicator, it should be preheated on the 1 (i.e. full position) graduation line for not less than 5 minutes before the test. For bimetallic fuel gauge indicators, during the test, the indicator should be kept at the scale line to be checked for at least 2 minutes before the indicated value can be read.
Article 4.7.2 of this standard should be checked in this test. 5.3.3 Pointer response time test
First, put the float of the fuel gauge sensor to the 0 empty position (E). At this time, the pointer of the fuel gauge indicator should point to the 0 scale line of the scale. When the indication is stable, quickly move the float to the 1 full position (F). When the pointer indicates 90% of the full value of the scale, measure the pointer response time. 5.3.4 Withstand voltage test
The withstand voltage test of the fuel gauge shall be carried out in accordance with the provisions of JB/T7696.1. 5.3.5 Gradient effect test
The gradient shadow test of the fuel gauge shall be carried out in accordance with the provisions of JB/T7696.1. 5.3.6 Alternating virtual heat test
The alternating virtual heat test of the fuel meter shall be carried out in accordance with the provisions of JB/T7696.1. 5.3.7 Voltage influence test
The voltage influence test of the fuel meter shall be carried out in accordance with the provisions of JB/T7696.1. 5.3.8 Vibration test
The vibration test of the fuel meter shall be carried out in accordance with the provisions of JB/T7696.1. 5.3.9 Durability test
The fuel meter shall be installed on the vehicle model, engine or test bench in the normal working position for testing. The fuel meter sensor shall be raised and lowered 2 to 3 times per minute. Each cycle shall make the indicated value of the fuel meter change from 0 empty (E) to 1 full (F) and then back to 0 empty (E), for a total of 30,000 times.
After the test, the fuel meter shall be checked for its performance in accordance with the method specified in Article 5.3.2 of this standard. 5.3.10 Dustproof test
The dustproof test of the fuel meter shall be carried out in accordance with the provisions of JB/T7696.1. 5.3.11 Water resistance test
The water resistance test of the fuel meter shall be carried out in accordance with the provisions of JB/T7696.1. 12
Inspection rules
6.1 Factory inspection
JB/T7696.2-95
6.1.1 The fuel meter shall be inspected and qualified by the inspection department of the manufacturer before it can be shipped out of the factory. The inspection items include 4.5, 4.7.2, 4.7.3, 4.7.4, 4.7.5 and 4.7.6.
6.1.2 The factory inspection shall be carried out in accordance with the provisions of GB2828, using a normal inspection one-time sampling plan, with a general inspection level of 1. Under normal circumstances, the inspection batch is 91 to 150, and the qualified quality level shall be determined in accordance with the provisions of Table 8 or by negotiation between the supply and demand parties. Table 8
Inspection items
Moving state of movable parts
Basic error
Withstand voltage performance
Pointer response time
Surface quality
In the inspection, if the number of unqualified items in each item is equal to or less than the corresponding qualified judgment number A, then accept the batch of products, otherwise check each item 6.1.3
.
6.2 Type inspection
6.2.1 The fuel meters for type inspection shall be selected from the same batch of fuel meters that have passed the factory inspection. The number of samples shall not be less than 9. First, re-inspect according to the factory inspection items. After passing the re-inspection, the products shall be evenly divided into 3 groups. 6.2.2 The items for each group to be inspected shall be in accordance with the provisions of Table 9. Table 9
First year
Voltage influence test
Water resistance
Dust resistance
Second year
Temperature influence test
Vibration test
Moisture and heat resistance
Paint and coating inspection
Third group
Durability test
6.2.3 During the test, if one item fails, it is allowed to re-sample double the number of products and re-check the unqualified item. If there are still unqualified ones, the batch of products will be judged as unqualified. 7 Marking, packaging, transportation and storage
Each fuel meter should be marked with the manufacturer's name, product model and rated working voltage. 7.1
7.2 Each fuel meter should be wrapped with plastic film and then packed in a foam packaging box. The outer surface of the packaging box should be marked with: a.
Manufacturer's name and address;
Product name and product model;
Quantity and year and month of manufacture.
7.3Put the packaging box into a box with protective fillings. The outer wall of the box should be marked with: the name and address of the consignee;
Product name, specifications and quantity:
Name and address of the consignor:
JB/F7696.2--95
d, anti-pressure, anti-vibration, anti-drenching, careful and other marks. 7.4The documents accompanying the packing should include the product factory certificate and product manual. 7.5The packed fuel meter should be placed in a ventilated and dry room. The storage period is one year (calculated from the date of entry into the warehouse by the manufacturer). When the storage period expires for one year, the fuel meter should still comply with the provisions of this standard. 8
Warranty period
If the fuel meter is damaged or cannot work normally due to poor manufacturing within 12 months from the date of delivery (based on the date of the delivery invoice) under normal use and maintenance by the user, the manufacturer shall be responsible for free repair or replacement. Additional Notes:
This standard was proposed and managed by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry and Shanghai Oriental Instrument Factory. The main drafters of this standard are Yang Cheng and Zhuo Liwei. 1411 Water resistance test
The water resistance test of the fuel meter shall be carried out in accordance with the provisions of JB/T7696.1. 12
Inspection rules
6.1 Factory inspection
JB/T7696.2-95
6.1.1 The fuel meter shall be inspected and qualified by the inspection department of the manufacturer before it can be shipped. The inspection items include 4.5, 4.7.2, 4.7.3, 4.7.4, 4.7.5 and 4.7.6.
6.1.2 The factory inspection shall be carried out in accordance with the provisions of GB2828, using a normal inspection one-time sampling plan, with a general inspection level of 1. Under normal circumstances, the inspection batch is 91 to 150, and the qualified quality level shall be determined in accordance with the provisions of Table 8 or by negotiation between the supply and demand parties. Table 8
Inspection items
Moving state of movable parts
Basic error
Withstand voltage performance
Pointer response time
Surface quality
In the inspection, if the number of unqualified items in each item is equal to or less than the corresponding qualified judgment number A, then accept the batch of products, otherwise check each item 6.1.3
.
6.2 Type inspection
6.2.1 The fuel meters for type inspection shall be selected from the same batch of fuel meters that have passed the factory inspection. The number of samples shall not be less than 9. First, re-inspect according to the factory inspection items. After passing the re-inspection, the products shall be evenly divided into 3 groups. 6.2.2 The items for each group to be inspected shall be in accordance with the provisions of Table 9. Table 9
First year
Voltage influence test
Water resistance
Dust resistance
Second year
Temperature influence test
Vibration test
Moisture and heat resistance
Paint and coating inspection
Third group
Durability test
6.2.3 During the test, if one item fails, it is allowed to re-sample double the number of products and re-check the unqualified item. If there are still unqualified ones, the batch of products will be judged as unqualified. 7 Marking, packaging, transportation and storage
Each fuel meter should be marked with the manufacturer's name, product model and rated working voltage. 7.1
7.2 Each fuel meter should be wrapped with plastic film and then packed in a foam packaging box. The outer surface of the packaging box should be marked with: a.
Manufacturer's name and address;
Product name and product model;
Quantity and year and month of manufacture.
7.3Put the packaging box into a box with protective fillings. The outer wall of the box should be marked with: the name and address of the consignee;
Product name, specifications and quantity:
Name and address of the consignor:
JB/F7696.2--95
d, anti-pressure, anti-vibration, anti-drenching, careful and other marks. 7.4The documents accompanying the packing should include the product factory certificate and product manual. 7.5The packed fuel meter should be placed in a ventilated and dry room. The storage period is one year (calculated from the date of entry into the warehouse by the manufacturer). When the storage period expires for one year, the fuel meter should still comply with the provisions of this standard. 8
Warranty period
If the fuel meter is damaged or cannot work normally due to poor manufacturing within 12 months from the date of delivery (based on the date of the delivery invoice) under normal use and maintenance by the user, the manufacturer shall be responsible for free repair or replacement. Additional Notes:
This standard was proposed and managed by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry and Shanghai Oriental Instrument Factory. The main drafters of this standard are Yang Cheng and Zhuo Liwei. 1411 Water resistance test
The water resistance test of the fuel meter shall be carried out in accordance with the provisions of JB/T7696.1. 12
Inspection rules
6.1 Factory inspection
JB/T7696.2-95
6.1.1 The fuel meter shall be inspected and qualified by the inspection department of the manufacturer before it can be shipped. The inspection items include 4.5, 4.7.2, 4.7.3, 4.7.4, 4.7.5 and 4.7.6.
6.1.2 The factory inspection shall be carried out in accordance with the provisions of GB2828, using a normal inspection one-time sampling plan, with a general inspection level of 1. Under normal circumstances, the inspection batch is 91 to 150, and the qualified quality level shall be determined in accordance with the provisions of Table 8 or by negotiation between the supply and demand parties. Table 8
Inspection items
Moving state of movable parts
Basic error
Withstand voltage performance
Pointer response time
Surface quality
In the inspection, if the number of unqualified items in each item is equal to or less than the corresponding qualified judgment number A, then accept the batch of products, otherwise check each item 6.1.3
.
6.2 Type inspection
6.2.1 The fuel meters for type inspection shall be selected from the same batch of fuel meters that have passed the factory inspection. The number of samples shall not be less than 9. First, re-inspect according to the factory inspection items. After passing the re-inspection, the products shall be evenly divided into 3 groups. 6.2.2 The items for each group to be inspected shall be in accordance with the provisions of Table 9. Table 9
First year
Voltage influence test
Water resistance
Dust resistance
Second year
Temperature influence test
Vibration test
Moisture and heat resistance
Paint and coating inspection
Third group
Durability test
6.2.3 During the test, if one item fails, it is allowed to re-sample double the number of products and re-check the unqualified item. If there are still unqualified ones, the batch of products will be judged as unqualified. 7 Marking, packaging, transportation and storage
Each fuel meter should be marked with the manufacturer's name, product model and rated working voltage. 7.1
7.2 Each fuel meter should be wrapped with plastic film and then packed in a foam packaging box. The outer surface of the packaging box should be marked with: a.
Manufacturer's name and address;
Product name and product model;
Quantity and year and month of manufacture.
7.3Put the packaging box into a box with protective fillings. The outer wall of the box should be marked with: the name and address of the consignee;
Product name, specifications and quantity:
Name and address of the consignor:
JB/F7696.2--95
d, anti-pressure, anti-vibration, anti-drenching, careful and other marks. 7.4The documents accompanying the packing should include the product factory certificate and product manual. 7.5The packed fuel meter should be placed in a ventilated and dry room. The storage period is one year (calculated from the date of entry into the warehouse by the manufacturer). When the storage period expires for one year, the fuel meter should still comply with the provisions of this standard. 8
Warranty period
If the fuel meter is damaged or cannot work normally due to poor manufacturing within 12 months from the date of delivery (based on the date of the delivery invoice) under normal use and maintenance by the user, the manufacturer shall be responsible for free repair or replacement. Additional Notes:
This standard was proposed and managed by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry and Shanghai Oriental Instrument Factory. The main drafters of this standard are Yang Cheng and Zhuo Liwei. 14
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