This standard specifies the performance, technical requirements and test methods of pressure gauge pressure measuring devices for construction machinery. This standard applies to pressure gauge pressure measuring devices for construction machinery. It is mainly applicable to the pressure measurement of hydraulic systems of construction machinery, and also to the pressure measurement of hydraulic systems of other machinery. JB/T 5930-1991 Pressure gauge pressure measuring device for construction machinery JB/T5930-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T5930-1991
Construction Machinery
Published on 1991-12-17
Pressure Gauge Pressure Measuring Device
Implemented on 1992-07-01
Published by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Mechanical Industry Standard of the People's Republic of China
Construction Machinery
Subject Content and Scope of Application
Pressure Gauge Pressure Measuring Device
This standard specifies the performance, technical requirements and test methods of pressure gauge pressure measuring devices for construction machinery. JB/T5930-1991
This standard applies to pressure gauge pressure measuring devices for construction machinery (hereinafter referred to as pressure measuring devices). It is mainly applicable to the pressure measurement of hydraulic systems of construction machinery, and also to the pressure measurement of hydraulic systems of other machinery. 2 Reference standards
GB1226
General pressure gauge
3 Composition, code and mark
3.1 The pressure measuring device consists of a shock-resistant pressure gauge, a hose assembly, a joint and a box. 3.2 The pressure measuring device is divided into single-meter type, double-meter type and multi-meter type. 3.3 The connecting thread of the pressure measuring device hydraulic system pressure point joint is M16. 3.4 The code and mark of the pressure measuring device are composed of the first letter of the Chinese pinyin of the two words "pressure measurement" and the number of the main parameters of the pressure measuring device (appearing in pairs). The diagram is as follows:
Each two digits represent the maximum pressure that can be measured by each meter (unit MPa) Pressure measuring device code
Marking example: The double-meter pressure measuring device with a range of 0~40 and 0~25MPa is marked as CY2540. 4 Technical requirements
4.1 The pressure measuring device should be manufactured according to the product drawings and technical documents approved by the relevant procedures. 4.2
The pressure gauge used in the pressure measuring device shall comply with the requirements of GB1226 and the seismic-resistant pressure gauge. It can be assembled only after passing the inspection. After the pressure measuring device is assembled, each connection part shall be firm and reliable, and there shall be no leakage in any part when measuring pressure. The pressure measuring device shall have a handle for easy carrying, and its weight shall not exceed 10kg. The pressure measuring device shall be able to work normally at an ambient temperature of -20 to +40℃. The pressure measuring device shall be able to work normally at a measured oil temperature of -20 to +80℃. The basic error and round trip difference of the pressure measuring device shall comply with the provisions of the following table. Measuring range MPa
Basic error
Measured value ±1.5%
Measured value ±1.5%
Measured value ±2.5%
Not exceeding the absolute value of basic error
Not exceeding the absolute value of basic error
Not exceeding the absolute value of basic error
Not exceeding the absolute value of basic error
3 The hose assembly must have sufficient connection strength, and its minimum bursting pressure should not be less than 3.5 times the maximum measured pressure. Approved by the Ministry of Machinery and Electronics Industry on December 17, 1991 and implemented on July 1, 1992
JB/T5930-1991
4.9 The pressure measuring device must be subjected to a pulse test, and the number of cycles shall not be less than 1.5×10* times. 4.10 The pressure gauge pointer of the pressure measuring device should not jump or stagnate during the measurement process. 4.11
The appearance of the pressure measuring device should be beautiful and generous, and the electroplating and painting should be uniform and the gloss should be consistent. The hose assembly and joints of the pressure measuring device should have good interchangeability, and the hose assembly and its matching parts should be flexible and convenient to operate by hand. 4.13 The product should be easy to maintain and repair. All wrench position dimensions should comply with the relevant standards. 5 Test method
5.1 Static pressure test of pressure measuring device
The pressure measuring device is firmly connected to the pressure source, and pressure is applied at a uniform rate from the lowest measurement range to the high measurement range. When each gear is pressurized to the maximum range of that gear, it is maintained for 30 seconds. During the test, the components of the pressure measuring device shall not have leakage or other abnormal phenomena. 5.2 Minimum bursting pressure test of hose assembly
5.2.1 The hose assembly end is firmly connected to the pressure source, and the other end is blocked. 5.2.2 Before the pressure measuring device is pressurized to 4 times of two-thirds of the maximum range at a uniform rate, all parts of the pressure measuring device shall not be damaged and all components shall not have leakage.
5.3 Static pressure sealing test of pressure measuring pipeline
5.3.1 Remove the pressure gauge and block the pressure gauge installation hole of the pressure measuring device. 5.3.2 One end of the hose assembly is firmly connected to the pressure source, and the other end is connected to the pressure measuring joint of the pressure measuring device. 5.3.3 Pressurize to 70% of the minimum burst pressure at a uniform rate, maintain the pressure for 5 minutes, and then release the pressure to zero. Repeat this process. During these two processes of pressurization and pressure release, the pipeline shall not have any leakage or damage. 5.4 Accuracy inspection of pressure measuring device
5.4.1 The accuracy inspection equipment is a standard piston pressure gauge with an accuracy of 50,000. 5.4.2
Connect the pressure measuring device and the piston pressure gauge. 5.4.3
Check the measurement range one by one as follows: a.
Take 5 checkpoints for each pressure gauge and gradually pressurize until the maximum value of the pressure gauge dial is reached, and record the pressure gauge reading at each point; release the pressure from the maximum value of the pressure gauge dial, take 5 checkpoints for each pressure gauge, and record the pressure gauge reading at each point; b.
Repeat the requirements in b three times in a row, and take the average value: the difference between this value and the given value of the standard piston pressure gauge is the basic error. The three average values ​​of the sum of the absolute values ​​of the difference between the pressure increase and pressure reduction readings at each checkpoint and the given value of the standard piston pressure gauge are the back and forth difference of the point.
5.4.4 The measured basic error and back and forth difference shall comply with the provisions of Article 4.7. 5.4.5 After the pressure is released after the inspection, the pressure gauge pointer shall be close to the zero position. 5.5 Pulse test
5.5.1 Connect one end of the hose assembly to the pulse test bench and the other end to the connector of the pressure measuring device. 5.5.2 The pulse test must be carried out in each measuring range, and the pulse pressure is 70% of the maximum range of the range, the pressure wave is a square wave, and the pulse frequency is 35~60 times/min.
5.5.3 The viscosity of the pulse test medium is hydraulic oil with grades N32N68. The oil temperature is 50±5C. 5.5.4 The total number of pulse tests shall comply with the provisions of Article 4.9. 6 Inspection rules
6.1 Inspection classification
Inspection is divided into factory inspection and type inspection.
6.2 Factory inspection
6.2.1 The pressure measuring device shall be inspected and qualified by the quality inspection department of the manufacturer and accompanied by an inspection certificate before it can be shipped out of the factory. 6.2.2 Factory inspection items
Inspection of shape and connection dimensions;
Appearance inspection;
Static pressure test of pressure measuring device;
Pressure measuring device accuracy inspection.
JB/T5930 -1991
6.2.3 Factory inspection items Each pressure measuring device must be fully inspected. Type inspection
Type inspection should be carried out in any of the following situations. Trial and development of new products;
In normal production, an inspection is required every three years. If the national quality supervision agency has conducted a type inspection in the current year, the factory inspection can be exempted. When the results are significantly different from the last type inspection: when the national quality supervision agency proposes a requirement for type inspection; when the factory is transferred for trial production.
Type inspection items
In addition to the factory inspection items, the following items shall also be carried out: a.
Hose assembly minimum burst pressure test;
Pulse test;
Pressure measuring pipeline static pressure seal test.
Marking, packaging, transportation, storage
The marking of the pressure measuring device shall be in a conspicuous position, must be durable, and include the following contents a.
Manufacturer name, product name, trademark; product model or mark, manufacturing date, product batch number: quality grade mark.
The pressure measuring device shall be packed in a packaging box. Moisture-proof and vibration-proof measures shall be taken, and the following documents shall be carried in the packaging box: a.
Product certificate;
Product manual;
List of random accessories;
Packing list.
7.3During transportation, the pressure measuring device shall be protected from direct rain and snow. In addition, collision and severe vibration should be avoided during transportation and loading and unloading of the pressure measuring device.
7.4 The pressure measuring device should be stored and kept in a warehouse at a storage temperature of -15~+40℃. The relative humidity of the storage should not exceed 80%. The pressure measuring device should be sent for calibration on time according to the time specified by the metrology verification unit. Additional notes:
This standard was proposed and managed by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was jointly drafted by the Tianjin Engineering Machinery Research Institute and the Luzhou Hydraulic Accessories General Factory. 3
People's Republic of China
Mechanical Industry Standard
Engineering Machinery Pressure Gauge Type Pressure Measuring Device
JB/T5930-1991
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
Print Sheet 1/2
Word Count 6.000
First Edition in December 1991
First Printing in December 1991
Print Quantity 1-500
Price 10.00 Yuanwww.bzxz.net
Mechanical Industry Standard Service Network: http://www.JB.ac.cn161-068
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