JB/T 6318-1992 Steam turbine shaft vibration measurement device (eddy current type) Technical conditions JB/T6318-1992 Standard download and decompression password: www.bzxz.net

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Pressing Machinery Ring Industry Standard of the People's Republic of China JB/T63181992
1992-06-26 4
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Theme content and scope of application
1
JB/T63181992
this The standard specifies the technical conditions, inspection, installation and calibration rules for non-contact eddy current shaft vibration monitoring devices; packaging, transportation and storage requirements.
This standard is applicable to monitoring the relative vibration of the shaft, and also applies to the relative vibration part of the absolute shaft vibration monitoring device. 2 Reference standards
JB3336
GB191
JB2759
GB3836
General technical conditions for power station equipment automation devices Packaging, storage and transportation pictorial signs
General technical conditions for mechanical and electrical product packaging
Explosion-proof electrical equipment for explosive environments
Technical requirements for devices
3
3.1 Overall machine performance
3.1.1 Accuracy
The accuracy of the device is 5% of the full scale.
3.1.2 Operating temperature
Eddy current probe and extension cable: one 20~+120℃ front probe, one 20~+65℃
Monitor and power supply, -29 ~~+55℃
3.1.3 Interchangeability
Without system calibration, the eddy current probe, proximitor or monitor can be replaced separately. The accuracy of the device is 10%. range. 3.2 Eddy current sensor
The eddy current sensor is composed of an eddy current probe, an extension cable and a pre-sensor. 3.2.1 The end diameter of the eddy current probe should be 8mm (including protective sleeve), the probe body material should be stainless steel, and the probe body thread: M10×1. The end diameter of the eddy current probe and the thread of the probe body can also be manufactured according to user needs. 3.2.2 Extension cable
The extension cable must be an oil-resistant, high-temperature-resistant PTFE coaxial cable or other high-temperature-resistant coaxial cable. The length of the extension cable (calculated from the end of the eddy current probe body ) is 5m or 9m. 3.2.3 Proximitor
After the eddy current probe, extension cable and proximitor are correctly connected, at a 24V regulated DC voltage (voltage deviation level ±5%, voltage ripple should be less than 1%), The following requirements should be met: 3.2.3.1 The sensitivity is 8mV/μm (deviation ±4%), including interchangeability error, it should be ±10%. 3.2.3.2 The linear range is not less than 1,5mm. 3.3 Monitor
The monitor should have the following functions:
1992-06-26rat
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1993-01-01
JB/T63181992
3.3.1 Continuous indication of vibration value (analog or digital) or selective indication by select and off. 3.3.2 It has light indication and contact output for the first alarm value and the second alarm value. The alarm should have a delay function. 3.3.3 The light indication and contact output of the second alarm value should have memory functions. 3.3.4 It has 4~20mA and 0~10V DC output proportional to the measured value, and the output has short circuit or open circuit protection. 3.3.5 The installation gap voltage or gap value of the eddy current probe can be measured on the front panel. 3.3.6 The monitor should not have an alarm output when a circuit failure occurs in the sensor. After the circuit failure is eliminated, the alarm circuit will delay for a period of time and return to normal operation.
3.3.7 When the device is working, the front panel should have a power-on light indicator. 3.3.8 The device should not issue any alarm output within 30 seconds after power is turned on or when power is cut off. 3.3.9 The two alarm settings on the device can be adjusted and checked. Precautions should be taken on the adjuster to prevent accidental operation by non-functional personnel. 3.3.10 When using eddy current sensors in both directions of X and Y, the monitor should display the maximum value and issue an alarm output according to the maximum value. The monitor should also be able to read out the specific detection values ??of X and Y as needed. 3.4 When using a shaft vibration measuring device in an explosion hazardous location, the device should comply with the requirements of GB3836. 3.5 AC power supply
Rated voltage: 220V,
.
b. Rated frequency: 50Hz;
c. Voltage deviation level: -15%~+10%| |tt||3.6 Function requirements
3.6.1 The eddy current probe should be installed within 75mm from the bearing side. 3.6.2 The initial installation room of the eddy current probe should be located at ±1V of the voltage at the linear midpoint of the eddy current sensor. 3.6.3 There should be no oil holes, keyways, scratches, etc. on the surface detected by the eddy current probe. The surface roughness Ra value is 3.2um. The sum of the mechanical runout and electrical runout of the measured surface does not exceed the greater of the following two values. Value: The maximum allowed peak-to-peak amplitude value is 25% or 6μm. 3.6.4 There should be no other metallic media within 2 times the diameter of the eddy current probe. 3.6.5 The eddy current probe is best fixed on the bearing to facilitate the installation and removal of the eddy current probe and adjustment of the installation gap when the bearing box cover is opened. 3.6.6 If the eddy current probe is fixed inside the bearing box, the fixing bracket should have sufficient rigidity. 3.6.7 When using two eddy current probes in the X and Y directions to monitor shaft vibration, the two probes should be installed at 90°. The probes can be installed in the same plane in the horizontal and vertical directions respectively, or they can be installed in the same plane at 45° on both sides of the vertical direction. At this time, the eddy current probe at 45° on the right side of the vertical direction (viewed from the turbine head) is positioned. It is the X direction probe. 3.6.8 The front-end device should be fixed in the junction box. When conditions permit, the front-end device of the same machine should be fixed in another junction box. The junction box basin should be fixed in a place with less vibration and lower temperature. 3.6.9 Shielded cables should be used to connect the front end to the monitor, and the shielded cables should be grounded at one end. 4 Pick-up inspection
4.1 The technical inspection department of the device manufacturer shall conduct tests in accordance with the provisions of JB3336. 4.2 The technical inspection department of the device manufacturer should conduct factory inspection of the device in accordance with the relevant chapters and articles of technical conditions in Chapter 3 of this standard. 4.3 After the user receives the device. The eddy current sensor should be calibrated to check the sensor sensitivity, linear range and probe installation clearance. 4.4 Use a shaft vibration calibration device and use dynamic signals generated by eddy current sensors to calibrate various functions of the monitor in accordance with the technical requirements of Chapter 3.3 and Article 3.
If there is no dynamic calibration device, the signal generator can also be used to calibrate the monitor using the dynamic signal generated by the eddy current sensor. 5 Warranty period
Under the conditions of strictly complying with the provisions in the instruction manual, within two years from the date of shipment of the device from the manufacturer, if the device fails to meet the technical requirements or is damaged due to design and manufacturing quality problems, the manufacturer Repair is at the factory's expense. If it cannot be repaired, the manufacturer will replace it at the manufacturer's expense. 2
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7
Delivery Documents
The following documents should be provided with the device:
Certificate;||tt ||a.
Instructions:
b.
Supply list.
c
mark, packaging, transportation, storage
7.1 mark
7.1.1 device
The nameplate of the device should have the following obvious signs.
b.
e.
d.
e.
7.1. 2
Name:
Model:
No.:
Manufacturer name;
Year and month of manufacture.
Eddy current sensor
7. 1. 2. 1
a.
b.
JB/T63181992
Eddy current probe and connector Long cables should be clearly marked as follows: Model:
No.
7. 1.2. 2
Pre-sensor
The nameplate of the front-sensor should have the following obvious markings: Model:
a.
b .
c
d.
e.
No.:
sensitivity;
linear range;
extension Cable length,
f.
terminal interface.
7.2 Packaging
The packaging of the device should comply with the relevant provisions of JB2759, 7.3 Transportation
The transportation of the device should comply with the relevant chapters and articles of GB191. Storage
7.4
The warehouse should meet the following conditions:
Indoor temperature: -5 ~ 10 40℃,
a,
relative humidity not greater than 90 %;
b.
c.
d.
There is no acid, alkali, salt, corrosive or explosive gas in the room, and no rain or snow intrusion.
Additional Notes:
JB/T63181992
This standard is proposed and managed by the Shanghai Power Generation Equipment Complete Design Institute of the Ministry of Machinery and Electronics Industry. This standard is drafted by the Shanghai Power Generation Equipment Complete Design Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Wang Fuhua, Ren Qihua, Li Yunlin, 4
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