Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T730794
Working Hour Meter for Construction Machinery
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implemented on July 1, 1995
Machinery Industry Standard of the People's Republic of China
Working Hour Meter for Construction Machinery
Subject Content and Scope of Application
JB/T7307-94
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, etc. of working hour meter for construction machinery (hereinafter referred to as hour meter).
This standard applies to working hour meter for construction machinery. 2
Reference standards
GB2423.17
GB2828
GB 4942.2
ZBT35001
3 Technical requirements
3.1 Basic requirements
Basic environmental test procedures for electrical and electronic products Test Db: Alternating damp heat test method Basic environmental test procedures for electrical and electronic products Test Ka: Salt spray test method Remote batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) Protection level of low-voltage electrical enclosures
Basic technical conditions for automotive electrical equipment
Hour meters for construction machinery should be manufactured according to drawings and technical documents approved by the prescribed procedures, and should meet the requirements of this standard. 3.2 Working environment
3.2.1 The ambient temperature is -40~+65C.
3.2.2 When the ambient temperature is 25±2°C, the relative humidity of the air should not exceed 95%. 3.3 Basic parameters and dimensions
The basic parameters of the hour meter are shown in Table 1, and the dimensions are shown in Figure 1 and Table 2. Table 1
Timing range
Display mode
Minimum unit
Rated voltage
Operating voltage
Timing accuracy
Approved by the Ministry of Machinery Industry on July 18, 1994
0~99999h (return to zero when exceeding 99999h) Digital wheel
Below 0.1%
Implementation on July 1, 1995
3.4 Surface quality
JB/T7307-94
3.4.1 The appearance shall not have defects such as deformation, bubbles, cracks, convexoconcave, etc. Glass and other transparent materials shall be transparent and clear, and shall not have scratches, refraction and distortion that may affect the reading. The electroplating layer and chemical treatment layer of parts shall comply with the relevant provisions of ZBT35001. 3.4.2 The numbers on the digital wheel are arranged neatly, completely and clearly, and when the numbers on the dial are naturally turned over, the height difference between the first and last digits on the digital wheel shall not exceed one third of the height of the numbers. The colors of the numbers before and after the decimal point on the digital wheel shall be clearly distinguishable. 3.4.3 When the current flows from the terminal (+) to (-), the digital wheel shall rotate. 3.4.4 All parts of the hour meter shall be firmly assembled, and the fasteners shall not be loose. 3.5 Performance
3.5.1 Insulation performance
The insulation resistance between the live parts of the hour meter and the shell shall be greater than 100MQ. 3.5.2 Voltage resistance performance
When the power supply voltage changes according to the rule of 0+32→0V (or 0→16-+0V), the hour meter works normally at 20~32V (or 10~15V).
3.5.3 Timing accuracy
When the hour meter works under the condition of rated voltage ± 20%, its timing accuracy shall not be less than 0.1%. 3.5.4 Temperature effect performance
After low temperature treatment at -40℃ and high temperature treatment at 65℃, the hour meter shall be able to work normally, and the timing accuracy shall not be less than 0.5%. 3.6 Durability
3.6.1 Mixed heat resistance
The hour meter shall be able to withstand the alternating damp heat test with a high temperature of 55℃ and a cycle of 2 days. After the test, it shall meet the requirements of Articles 3.3 and 3.4.
3.6.2 Temperature change resistance performance
JB/T7307-94
After the five cycles of temperature change test specified in Table 3, the hour meter should still meet the performance requirements of 3.5.1, 3.5.2 and 3.5.3. Table 3
Test sequence
3.6.3 Vibration resistance performance
Effective temperature
-40±3
Release time min
· 2~3
The hour meter should 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 should comply with the provisions of Table 4, Table 5 and Table 6.
Measure the resonance point according to the provisions of Table 4·.
Reporting rate
3. 6. 3. 2
Frequency sweep period
If there is no resonance point, carry out vibration endurance test as specified in Table 5. Table 5
Vibration frequency
Vibration acceleration
Perturbation acceleration
Test time h
Full amplitude
0.4 or less
3.6.3.3 When there is a resonance point, the vibration test should be carried out for 1h up and down, 0.5h on the right and front and back according to the full amplitude shown in the resonance point and Figure 2, and then the test specified in Table 6 should be carried out
16.733.866.7
156.7333.4 666.77
Actuation rate Ht
Vibration rate
According to dynamic acceleration
JB/T 7307--94
Vibration time b
After the test, use a magnifying glass to check the weld. There shall be no cracks at the internal circuit soldering, and the performance requirements of 3.5.1, 3.5.2 and 3.5.3 shall be met.
3.6.4 Impact resistance
The hour meter shall be able to withstand the impact test specified in Table 7. After the test, use a magnifying glass to check. There shall be no cracks at the internal circuit soldering, and the performance requirements of 3.5.1, 3.5.2 and 3.5.3 shall be met. Table 7
Impact time 5
0.015~0.019
Impact speed g (m/s
25(245.3)
Note: 1) The impact time is the time when the shock acceleration added to the hour meter is the maximum. 3.6.5 Water resistance
Impact number
After the water spray test, the inner glass surface of the hour meter shall not be water-permeable, and there shall be no other abnormal phenomena, and it shall meet the performance requirements of 3.5.1, 3.5.2 and 3.5.3.
3.6.6 Dust resistance
The hour meter shall be able to prevent dust from entering the interior: 3.6.7 Salt spray resistance
After the 16h salt spray test, the hour meter shall be able to work normally. 4 Test method
Test instrument
The accuracy of the standard thermometer shall not be less than ±1℃, the accuracy of the electronic stopwatch shall not be less than 0.1s, and the test voltage shall be in accordance with the provisions of Table 8. 8
Rated voltage
Test voltage
4.2 Surface quality
Appearance inspection The visual inspection shall be carried out under a uniform illumination of 300Ix and an eye distance of 500mm. The gold exhibition bond layer and chemical treatment layer shall be inspected according to the method specified in ZBT35001. 4.3 Insulation performance
Under normal temperature and humidity conditions, use a 500V megohmmeter to measure the resistance between the terminal and the case. 4.4
Withstand voltage performance
Change the power supply voltage according to the following rules: When using 12V, the voltage changes from 0+16→0V, and check the working condition of the stopwatch at 10~15V: When using 24V, the voltage changes from 0→32→0V, and check the working condition of the stopwatch at 20~32V. 4.5 Timing accuracy
The hour meter works continuously for 24 hours within the range of rated voltage ±20%, and an electronic stopwatch is used to detect the cumulative error of 4
in the hours displayed by the hour meter.
4.6 Temperature influence test
JB/T 7307—94
First check the indication value of the hour meter at room temperature, then put the hour meter in a high temperature (or low temperature) box in a normal installation state. The temperature in the box is the same as that in the room. Then raise the temperature in the box to (or lower it to) 65°C (or -40°C). Connect the power supply to keep warm for 2 hours, cut off the power supply and take the hour meter out of the box. Check its indication value within 2 minutes, and thus obtain the difference between the indication value at high or low temperature and room temperature. 4.7 Humidity and heat resistance test
According to the provisions of GB2423.4 and Article 3.6.1 of this standard. 4.8 Temperature change test
During the test, put the hour meter into a 40℃ low temperature box for 2 hours, take it out, and place it at room temperature for 2 to 3 minutes. Then put the hour meter into a 65℃ high temperature box for 2 hours, take it out, and place it at room temperature for 2 to 3 minutes (if using automatic two-box test equipment, it can be less than 30 seconds, no need to place it at room temperature). The above process constitutes a cycle, and the test is completed after five cycles. The test box should be able to return to the adjustment temperature before the hour meter is placed within 12 minutes after the hour meter is placed. After the test, the hour meter is placed under normal temperature, pressure and humidity conditions for 4 hours, and then inspected according to Article 3.5.3. 4.9 Resistance to vibration
Install the hour meter on the vibration test bench in normal working state, and perform fixed frequency and swept frequency vibration according to the provisions of Article 3.6.3 of this standard. After the test, the hour meter should be placed in the standard environment for not less than 4 hours, and then tested according to Articles 3.5.1, 3.5.2 and 3.5.3. 4.10 Impact test
The impact performance test of the hour meter should be carried out on the impact test bench in the packaged state according to the provisions of Table 7. The test voltage should be according to the provisions of Table 8. After the test, it should be tested according to Articles 3.5.1, 3.5.2 and 3.5.3. 4.11 Water resistance test
Perform the test method and conditions of IPX4 specified in GB4942.2, with a water spray time of 30 minutes, and then perform the inspection according to 3.5.1, 3.5.2 and 3.5.3
4.12 Dust resistance test
4.12.1 The test should be carried out in a closed box with a length, width and height of 900 to 1200 mm. In addition to the necessary sample clamping device, there should be no device that hinders the free flying of dust in the box. The dust should be able to gather near the blowing hole. 4.12.2 Test conditions According to the provisions of Table 9, the sample is more than 150 mm away from the box wall. 5 kg of ordinary Portland cement is injected into the box, and then 10 seconds of air is sprayed every 15 minutes to make the dust diffuse into a uniform state in the box. The test is carried out until 8 hours. After the test, use visual and hand feeling to check whether there is dust in the hour meter.
Ordinary Portland Cement 5kg
5 Inspection Rules
5.1 Factory Inspection
Ambient Temperature
20±15
Relative Humidity
Dust Control
Blowing for 10s every 15min
Above 6000
Test Time
5.1.1 The hour meter must be inspected and qualified by the quality inspection department of the manufacturer before it can be shipped out of the factory. The inspection items include 3.4 and 3.5.1, 3.5.2 and 3.5.3.
5.1.2 Factory inspection shall be carried out in accordance with the provisions of GB2828, using a normal inspection and one-time sampling plan, generally with inspection level 1, and under normal circumstances, the inspection batch is 91~150. The qualified quality level shall be in accordance with the provisions of Table 10 or agreed upon by the two parties to the mine supply. 5
JB/T 7307--94
Inspection items
Timing accuracy
Insulation performance
Withstand voltage performance
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, the batch of products shall be accepted, otherwise, check each item 5.1.3
.
5.2 Type inspection
5.2.1 The hour meters for type inspection shall be selected from the batch of hour meters that have passed the factory inspection. The number of hour meters selected shall not be less than 9. Re-inspection shall be carried out according to the factory inspection items first. After the re-inspection is qualified, the products shall be evenly divided into 3 groups. 5.2.2 The items for inspection of each group shall be in accordance with the provisions of Table 11. Table 11
Group 1
Moisture test
Compliance change test
Group 2
Moisture influence test
Impact test
Moisture and heat resistance
Group 3
Water resistance
Dust resistance
Salt test
5.2.3 If one item fails in the test, it is allowed to re-sample double the number of products and re-check the failed item. If there are still unqualified items, the batch of products will be judged as unqualified. 6 Marking, packaging, transportation and storage
Each hour meter should be marked with the manufacturer's name, product model, and rated working voltage. 6.1
6.2 Each hour 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, product model:
Quantity and year and month of production.
Put the packaging box in a packaging box with protective fillings. The outer wall of the packaging box should be marked with: 6.3
Name and address of the receiving unit:
Product name, specifications and quantity:
Name and address of the shipping unit;
"Anti-pressure", "Anti-dew", "Anti-drenching", "Be careful and respectful" and other marks. 6.4
The documents accompanying the return packing shall include the product factory certificate and product manual. 6.5 The packed hour meter shall be stored in a ventilated and dry room for one year (calculated from the date of entry into the warehouse by the manufacturer). When the storage period expires, the hour meter shall still comply with the provisions of this standard. Warranty period
The hour meter is under normal use and maintenance conditions by the user and within 12 months from the date of change of goods (based on the date of the delivery note). If the hour meter is damaged or cannot work normally due to poor manufacturing, the manufacturer shall be responsible for free repair or replacement. 6
Additional instructions:
JB/T7307-94
This standard was proposed and managed by Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Tianjin Engineering Machinery Research Institute and Taizhou Science and Technology Experimental Factory. The main drafters of this standard are Yang Chengshan and Chu Junmin.2 The items to be tested in each group shall be in accordance with the provisions of Table 11. Table 11
Group 1
Moisture test
Degree change test
Group 2
Degree influence test
Impact test
Moisture and heat resistance
Group 3
Water resistance
Dust resistance
Salt test
5.2.3 If one item fails in the test, it is allowed to re-sample double the number of products and re-check the failed item. If there are still unqualified items, the batch of products shall be judged as unqualified. 6 Marking, packaging, transportation and storage
Each hour meter should be marked with the manufacturer's name, product model, and rated working voltage. 6.1wwW.bzxz.Net
6.2 Each hour 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, product model:
Quantity and year and month of production.
Put the packaging box in a packaging box with protective fillings. The outer wall of the packaging box should be marked with: 6.3
Name and address of the receiving unit:
Product name, specifications and quantity:
Name and address of the shipping unit;
"Anti-pressure", "Anti-dew", "Anti-drenching", "Be careful and respectful" and other marks. 6.4
The documents accompanying the return packing shall include the product factory certificate and product manual. 6.5 The packed hour meter shall be stored in a ventilated and dry room for one year (calculated from the date of entry into the warehouse by the manufacturer). When the storage period expires, the hour meter shall still comply with the provisions of this standard. Warranty period
The hour meter is under normal use and maintenance conditions by the user and within 12 months from the date of change of goods (based on the date of the delivery note). If the hour meter is damaged or cannot work normally due to poor manufacturing, the manufacturer shall be responsible for free repair or replacement. 6
Additional instructions:
JB/T7307-94
This standard was proposed and managed by Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Tianjin Engineering Machinery Research Institute and Taizhou Science and Technology Experimental Factory. The main drafters of this standard are Yang Chengshan and Chu Junmin.2 The items to be tested in each group shall be in accordance with the provisions of Table 11. Table 11
Group 1
Moisture test
Degree change test
Group 2
Degree influence test
Impact test
Moisture and heat resistance
Group 3
Water resistance
Dust resistance
Salt test
5.2.3 If one item fails in the test, it is allowed to re-sample double the number of products and re-check the failed item. If there are still unqualified items, the batch of products shall be judged as unqualified. 6 Marking, packaging, transportation and storage
Each hour meter should be marked with the manufacturer's name, product model, and rated working voltage. 6.1
6.2 Each hour 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, product model:
Quantity and year and month of production.
Put the packaging box in a packaging box with protective fillings. The outer wall of the packaging box should be marked with: 6.3
Name and address of the receiving unit:
Product name, specifications and quantity:
Name and address of the shipping unit;
"Anti-pressure", "Anti-dew", "Anti-drenching", "Be careful and respectful" and other marks. 6.4
The documents accompanying the return packing shall include the product factory certificate and product manual. 6.5 The packed hour meter shall be stored in a ventilated and dry room for one year (calculated from the date of entry into the warehouse by the manufacturer). When the storage period expires, the hour meter shall still comply with the provisions of this standard. Warranty period
The hour meter is under normal use and maintenance conditions by the user and within 12 months from the date of change of goods (based on the date of the delivery note). If the hour meter is damaged or cannot work normally due to poor manufacturing, the manufacturer shall be responsible for free repair or replacement. 6
Additional instructions:
JB/T7307-94
This standard was proposed and managed by Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Tianjin Engineering Machinery Research Institute and Taizhou Science and Technology Experimental Factory. The main drafters of this standard are Yang Chengshan and Chu Junmin.
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