MT/T 923-2002 Inspection specification for speed regulating hydraulic couplings for coal mines
Some standard content:
ICS73.020
Record number: 10513--2002
Coal Industry Standard of the People's Republic of China
MT/ 923--2002
The examinatorial specification of variablespeed fluid couplings for coal mining2002-06-19 Issued
National Economic and Trade Commission
2002-09-01 Implementation
MT/T923-2002
Speed-adjusting fluid couplings have developed rapidly in recent years, and the scope of use in coal mines has become wider and wider, and the number has increased. However, there is currently no industry standard for variable-speed fluid couplings that is suitable for coal mine working conditions. Therefore, this standard is proposed. Appendix A and Appendix B of this standard are both suggestive appendices. This standard is proposed by the China Coal Industry Association. This standard is under the jurisdiction of the Coal Industry Coal Mine Special Equipment Standardization Technical Committee. The Shanghai Branch of China Coal Research Institute is responsible for drafting this standard. The main drafters of this standard are Zhang Bochao, Wang Guangbing, Huang Fukui, Liu Chenyang, and Tao Zhengfeng. This standard is entrusted to the Shanghai Branch of China Coal Research Institute for interpretation. 1 Scope
Coal Industry Standard of the People's Republic of China
The examinatorial specification of variablespeed fluid couplings for coal miningMT/T923—2002
This standard specifies the inspection types, inspection items, inspection equipment, inspection conditions, inspection contents, inspection methods and inspection rules of variablespeed fluid couplings (hereinafter referred to as couplings). This standard is applicable to variablespeed fluid couplings used in workplaces such as underground coal mines, ventilation rooms, and open-pit coal mines. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB3836.1-2000 Electrical equipment for explosive gas atmospheres Part 1: General requirements "Coal Mine Safety Regulations" National Coal Mine Safety Supervision Bureau 2001 Edition 3 Inspection Types
a) Factory inspection;
b) Type inspection;
Type inspection should be carried out in any of the following situations: 1) New products produced on trial basis (including conversion of old products); 2) When the design, process, and materials of the product affect the product performance; 3) When production is resumed after 3 years of suspension; 4) Large-scale production, once every 5 years; 5) When the user has objections to product quality and requests arbitration. 4 Inspection Items
All types of inspections of couplers shall be carried out according to the items specified in Table 1. The format of the factory inspection report can be referred to Appendix A (Reminder Appendix). Table 1
Test items
Flexibility of duct operation
Seal inspection
Bearing temperature test
Vibration test
Approved by the State Economic and Trade Commission on 2002-06-19 Factory inspection
Inspection type
Type inspection
Implemented on 2002-09-01
Test items
Noise inspection
No-load inspection
Speed increase and decrease test
Speed adjustment range test
External characteristic test
Overtemperature test
Overspeed test
MT/T923-2002
Continued Table 1
Factory test
Note, "√" means test is carried out; "A" means no test is carried outTest equipment
Test type
Type test
5.1 The test device shall meet the requirements of the corresponding test items. When the power or torque of the tested coupler is greater than the capacity of the test device, according to theoretical analysis, the geometrically similar hydraulic coupling has similar original characteristics in the self-modeling area (Reynolds coefficient R, ≥5×105), and it is allowed to use the test method of reducing the input speed to test according to the torque that the test device can provide. The data measured by the speed reduction test is converted into data at rated speed, which can be obtained according to formula (1):
M./Men/nt?
Wherein: M.
Torque value under rated working conditions, N·m;
Speed value under rated working conditions, r/min;
Mr-Torque value measured by the speed reduction test, N·m; n——Speed value measured by the speed reduction test, r/min. The inspection device system refers to Appendix B (suggested appendix). 5.2
Various sensors, mutual inductors, measuring instruments, recording instruments and measuring tools should all have inspection certificates and be calibrated regularly. 5.4The measuring instruments should meet the measurement accuracy specified in Table 2. Table 2
Measurement parameters
6Test conditions
Type test
±2μm
Factory test
±3μm
6.1 The working fluid shall meet the safety requirements for underground mines, and the working fluid used for inspection shall be the same as the design requirements. (1)
6.2 The auxiliary equipment of the coupler shall comply with the "Safety Regulations for Coal Mines", and the electronic control equipment shall comply with the provisions of GB3836.1 and have a certificate of qualification for underground mines.
6.3 Select a coupler as the test piece for type inspection. The couplers for type inspection shall be manufactured according to the same process level, and couplers that are deliberately selected according to special manufacturing processes or have undergone additional preparations shall not be used. 2
MT/T923—2002
6.4 Record the measurement results and draw the original characteristic curve and external characteristic curve. 7 Inspection Contents
7.1 Inspection of the flexibility of the operation of the duct
7.1.1 Inspection Method
Run without load for 2 hours, during which time the duct opening is changed from 0→100%→0 from low speed to high speed every 10 minutes. 7.1.2 Inspection Requirements
a) All connectors and fasteners shall not be loose; b) There shall be no leakage or seepage at the sealing and joints; c) The operation shall be stable;
d) The operation of the duct shall be flexible, stable and reliable. 7.2 Sealing Inspection
7.2.1 Inspection Method
Adjust the duct opening, increase the slip by loading or braking device, let the liquid temperature rise to (95±5)℃, keep it for 5 minutes, and observe whether the sealing and operation are normal.
7.2.2 Inspection Requirements
Check the input and output shafts and other joints. There shall be no leakage or seepage, and the operation shall be stable. 7.3 Bearing temperature test
7.3.1 Test method
The duct opening is 100%, rated speed, rated power loading (when the power of the test piece is greater than the power of the test equipment, the speed can be reduced for testing), and the test is carried out continuously for 8 hours. The temperature is measured every 15 minutes. 7.3.2 Test requirements
Record the bearing temperature. The temperature rise of the bearing seat surface shall not exceed 65℃, and the maximum temperature shall not exceed 90℃. 7.4 Vibration test
7.4.1 Test method
At no load and rated speed, when the duct opening is 100%, 50%, and 0, the horizontal, vertical, and axial vibration displacement amplitudes are measured and recorded at the input and output bearing seats of the test piece respectively. 7.4.2 Test requirements
Regardless of the horizontal, vertical, and axial vibration displacement values, they shall comply with the provisions of Table 3. Table 3
Test piece rated input speed/(r·min-\)）Vibration displacement value/μm
7.5 Noise test
7.5.1 Test method
≤375
When the coupler is at rated input speed and the duct opening is 100%, the sound level meter is used to measure the noise at a radial horizontal distance of 1m from the measuring point on the outer wall of the hydraulic coupling.
7.5.2 Test requirements
The noise value is not greater than 90dB(A).
7.6 No-load test
7.6.1 Test method
When the output shaft of the coupler is unloaded, measure the input power when the duct opening is 0 and 100% and the input speed is rated. 7.6.2 Inspection requirements
MT/T923—2002
The no-load power loss when the duct opening is 0% and 100% shall not be greater than 1% of its rated transmission power. 7.7 Speed increase and decrease inspection
7.7.1 Inspection method
Apply a certain load to the output shaft (for couplers with design power less than or equal to 200kW, load at rated power; for couplers with design power greater than 200kW, load at 200kW), measure the output speed, and the time required from the lowest speed (duct opening is 0) to the rated speed (duct opening is 100%) is the speed-up time. Apply a certain load to the output shaft (for couplers with design power less than or equal to 200kW, load at rated power; for couplers with design power greater than 200kW, load at 200kW), measure the output speed, and the time required from the rated speed (duct opening is 100%) to the lowest stable speed (duct opening is 0) is the speed-down time. 7.7.2 Inspection requirements
Record the speed-up and speed-down times.
7.8 Speed regulation range test
7.8.1 Test method
Input rated speed, adjust the opening of the duct, measure the maximum output speed and the minimum stable speed (the speed fluctuation does not exceed ±3% of the speed, which is the stable speed), and calculate the speed regulation range. 7.8.2 Inspection requirements
Draw the input, output speed and output torque in real time, and record the input torque and speed; output torque and speed, calculate the speed ratio: O=nTmax/nTmin
Where: nTax"
- ... %, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% continuous and uniform loading, record the input and output speeds, input and output torques, liquid supply pump flow, outlet liquid temperature, and inlet liquid pressure in Table 4, and draw the M-n curve.
Conduit position S=
Loading sequence
Measurement disk parameters
Turbine speed/
(r·min\1)
Turbine torque/
Pump wheel speed/
(r·min-\)
Pump wheel torque/
Room temperature:
Conduit position; S:
Loading sequence
Measurement disk parameters
Outlet liquid temperature/| |tt||Imported hydraulic pressure/
Liquid supply pump flow/
(m*·h-1)
7.9.2 Inspection requirements
MT/T923—2002
Continued Table 4
7.9.2.1 When the duct opening is 100% and the speed ratio i=0.97, the input is ≥1.9×10-6Ag=Mg/(pgng*D5)）
i=nt/ng
Where: - Impeller torque coefficient, min\/(mr\); p——working liquid density, kg/m;
g-gravitational acceleration, m/s;
Input speed (impeller speed), r/min; -Effective diameter of working chamber, m;
- Input torque (pump torque), N·mABa—Rated working condition pump torque coefficient, min*/（mr\）ntOutput speed (turbine speed), r/min; Room temperature:
Draw the original characteristic curve, that is, the relationship curve between the pump torque coefficient input and the speed ratio. 7.9.2.2 Rated efficiency
n=nteMte/(ngeMe）
Where:
-Rated efficiency;
Input speed at rated slip (S=3%), r/minOutput speed at rated slip (S=3%), r/min; Me—Input torque at rated slip (S=3%), N·m; Mte——Output torque at rated slip (S=3%), N·m. 7.10 Overtemperature test
7.10.1 Test method
Let the coupler under test reach 110% of the maximum allowable liquid temperature and run it at rated speed for 5 minutes without load. 7.10.2 Test requirements
（3）
（4）
·（5）
Let the coupler liquid temperature reach 110% of the maximum allowable liquid temperature and run it at rated speed for 5 minutes without load. There shall be no oil leakage at all joints and seals.
7.11 Overspeed test
7.11.1 Test method
Let the coupler under test run at 105% of the rated speed for 1 hour without load. 7.11.2 Test requirements
The coupler must run at 105% of the rated speed for 1 hour without load. It should run smoothly without any abnormality. 5
8 Inspection rules
MT/T923—2002
8.1 Factory inspection rules
Each coupler shall be subject to factory inspection. If any inspection item in the factory inspection does not meet the inspection requirements in Chapter 7, the coupler shall be judged as unqualified.
8.2 Type inspection rules
During the trial production and type identification, a formal trial-produced coupler sample may be used for type inspection. When the coupler is normally subjected to type inspection, the coupler used for type inspection must be randomly selected from the couplers (not less than two) that have passed the factory inspection. The inspection items must meet the requirements in Chapter 4, and the inspection results must meet the inspection requirements in Chapter 7. If any inspection item in the type inspection does not meet the inspection requirements in Chapter 7, the coupler shall be judged as unqualified. Date:
No.:
MT/T923—2002
Appendix A
(Suggested Appendix)
Factory Inspection Report of Regulating Speed Fluid Coupling Manufacturer:
Test Medium:
Inspection Items
Flexibility of Conduit Operation
Input Shaft
Seal Inspection
Vibration Inspection
Noise Inspection
No-load Power
Output Shaft
Other joints
Input end
Output end
Model:
Room temperature:
MT/T923-2002
Appendix B
(Appendix of suggestion)
System diagram of speed regulating hydraulic coupling test device X
1—motor; 2—torque speed meter: 3 test piece: 4-loading device: 5—thermometer: 6-pressure gauge; 7 oil filter: 8-cooler: 9—flow plate meter: 10—test instrument MT/T 923---2002
ISBN 7-5020-2193-0
Coal
Industry, Standard of the People's Republic of China
Test Specification for Speed Regulating Hydraulic Couplings for Coal Mines MT/T923-2002
Published by Meiyan Industry Press
(No. 35 Yaoju, Zhiyang District, Beijing 100029) Printed by Beijing Fangshan Honghua
Published by Beijing Publishing House of Xinhua Bookstore
Book size 880 ×1230mm1/16 sheet3/4
Word count15,000 words
Print run1-235
1st edition, September 2002
1st printing, September 2002
ISBN7-5020-2193-0/F652.2
All rights reserved. Violators will be prosecuted
If there are any quality problems such as missing pages, sample pages, or pages falling off, our company will be responsible for replacing them2 Inspection requirements
Draw the input, output speed and output torque in real time, and record the input torque and speed; output torque and speed, calculate the speed ratio: O=nTmax/nTmin
Where: nTax"
Output maximum speed, r/min;
-output minimum stable speed, r/min.
For centrifugal load, the speed ratio ≥4;
For constant torque load, the speed ratio is 63.
7.9 External characteristics inspection
7.9.1 Inspection method
Parameter measurement should be carried out within the range of outlet liquid temperature (65±5)°C, and the input speed is the rated speed. (2)
According to the duct opening of 0, 10%, 2 0%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% continuous and uniform loading, input and output speed, input and output torque, liquid supply pump flow, outlet liquid temperature, inlet liquid pressure are recorded in Table 4, and the M-n curve is drawn.
Conduit position S=
Loading sequence
Measurement disk parameter
Turbine speed/
(r·min\1)
Turbine torque/
Pump wheel speed/
(r·min-\)
Pump wheel torque/
Room temperature:
Conduit position; S:
Loading sequence
Measurement disk parameter
Outlet liquid temperature/||t t||Imported hydraulic pressure/
Liquid supply pump flow/
(m*·h-1)
7.9.2 Inspection requirements
MT/T923—2002
Continued Table 4
7.9.2.1 When the duct opening is 100% and the speed ratio i=0.97, the input is ≥1.9×10-6Ag=Mg/(pgng*D5)）
i=nt/ng
Where: - Impeller torque coefficient, min\/(mr\); p——working liquid density, kg/m;
g-gravitational acceleration, m/s;
input speed (impeller speed), r/min; -effective diameter of working chamber, m;
-input Input torque (pump torque), N·mABa—Rated working condition pump torque coefficient, min*/（mr\）ntOutput speed (turbine speed), r/min; Room temperature:
Draw the original characteristic curve, that is, the relationship curve between the pump torque coefficient input and the speed ratio. 7.9.2.2 Rated efficiency
n=nteMte/(ngeMe）
Where:
-Rated efficiency;
Input speed at rated slip (S=3%), r/minOutput speed at rated slip (S=3%), r/min; Me—Input torque at rated slip (S=3%), N·m; Mte——Output torque at rated slip (S=3%), N·m. 7.10 Overtemperature test
7.10.1 Test method
Let the coupler under test reach 110% of the maximum allowable liquid temperature and run it at rated speed for 5 minutes without load. 7.10.2 Test requirements
（3）
（4）
·（5）
Let the coupler liquid temperature reach 110% of the maximum allowable liquid temperature and run it at rated speed for 5 minutes without load. There shall be no oil leakage at all joints and seals.
7.11 Overspeed test
7.11.1 Test method
Let the coupler under test run at 105% of the rated speed for 1 hour without load. 7.11.2 Test requirements
The coupler must run at 105% of the rated speed for 1 hour without load. It should run smoothly without any abnormality. 5
8 Inspection rules
MT/T923—2002
8.1 Factory inspection rules
Each coupler shall be subject to factory inspection. If any inspection item in the factory inspection does not meet the inspection requirements in Chapter 7, the coupler shall be judged as unqualified.
8.2 Type inspection rules
During the trial production and type identification, a formal trial-produced coupler sample may be used for type inspection. When the coupler is normally subjected to type inspection, the coupler used for type inspection must be randomly selected from the couplers (not less than two) that have passed the factory inspection. The inspection items must meet the requirements in Chapter 4, and the inspection results must meet the inspection requirements in Chapter 7. If any inspection item in the type inspection does not meet the inspection requirements in Chapter 7, the coupler shall be judged as unqualified. Date:
No.:
MT/T923—2002
Appendix A
(Suggested Appendix)
Factory Inspection Report of Regulating Speed Fluid Coupling Manufacturer:
Test Medium:
Inspection Items
Flexibility of Conduit Operation
Input Shaft
Seal Inspection
Vibration Inspection
Noise Inspection
No-load Power
Output Shaft
Other joints
Input end
Output end
Model:
Room temperature:
MT/T923-2002
Appendix B
(Appendix of suggestion)
System diagram of speed regulating hydraulic coupling test device X
1—motor; 2—torque speed meter: 3 test piece: 4-loading device: 5—thermometer: 6-pressure gauge; 7 oil filter: 8-cooler: 9—flow plate meter: 10—test instrument MT/T 923---2002
ISBN 7-5020-2193-0
Coal
Industry, Standard of the People's Republic of China
Test Specification for Speed Regulating Hydraulic Couplings for Coal Mines MT/T923-2002
Published by Meiyan Industry Press
(No. 35 Yaoju, Zhiyang District, Beijing 100029) Printed by Beijing Fangshan Honghua
Published by Beijing Publishing House of Xinhua Bookstore
Book size 880 ×1230mm1/16 sheet3/4
Word count15,000 words
Print run1-235
1st edition, September 2002
1st printing, September 2002
ISBN7-5020-2193-0/F652.2
All rights reserved. Violators will be prosecuted
If there are any quality problems such as missing pages, sample pages, or pages falling off, our company will be responsible for replacing them2 Inspection requirements
Draw the input, output speed and output torque in real time, and record the input torque and speed; output torque and speed, calculate the speed ratio: O=nTmax/nTmin
Where: nTax"
Output maximum speed, r/min;
-output minimum stable speed, r/min.
For centrifugal load, the speed ratio ≥4;
For constant torque load, the speed ratio is 63.
7.9 External characteristics inspection
7.9.1 Inspection method
Parameter measurement should be carried out within the range of outlet liquid temperature (65±5)°C, and the input speed is the rated speed. (2)
According to the duct opening of 0, 10%, 2 0%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% continuous and uniform loading, input and output speed, input and output torque, liquid supply pump flow, outlet liquid temperature, inlet liquid pressure are recorded in Table 4, and the M-n curve is drawn.
Conduit position S=
Loading sequence
Measurement disk parameter
Turbine speed/
(r·min\1)
Turbine torque/
Pump wheel speed/
(r·min-\)
Pump wheel torque/
Room temperature:
Conduit position; S:
Loading sequence
Measurement disk parameter
Outlet liquid temperature/||t t||Imported hydraulic pressure/
Liquid supply pump flow/
(m*·h-1)
7.9.2 Inspection requirements
MT/T923—2002
Continued Table 4
7.9.2.1 When the duct opening is 100% and the speed ratio i=0.97, the input is ≥1.9×10-6Ag=Mg/(pgng*D5)）
i=nt/ng
Where: - Impeller torque coefficient, min\/(mr\); p——working liquid density, kg/m;
g-gravitational acceleration, m/s;
input speed (impeller speed), r/min; -effective diameter of working chamber, m;
-input Input torque (pump torque), N·mABa—Rated working condition pump torque coefficient, min*/（mr\）ntOutput speed (turbine speed), r/min; Room temperature:
Draw the original characteristic curve, that is, the relationship curve between the pump torque coefficient input and the speed ratio. 7.9.2.2 Rated efficiency
n=nteMte/(ngeMe）
Where:
-Rated efficiency;
Input speed at rated slip (S=3%), r/minOutput speed at rated slip (S=3%), r/min; Me—Input torque at rated slip (S=3%), N·m; Mte——Output torque at rated slip (S=3%), N·m. 7.10 Overtemperature test
7.10.1 Test method
Let the coupler under test reach 110% of the maximum allowable liquid temperature and run it at rated speed for 5 minutes without load. 7.10.2 Test requirements
（3）
（4）
·（5）
Let the coupler liquid temperature reach 110% of the maximum allowable liquid temperature and run it at rated speed for 5 minutes without load. There shall be no oil leakage at all joints and seals.
7.11 Overspeed test
7.11.1 Test methodbZxz.net
Let the coupler under test run at 105% of the rated speed for 1 hour without load. 7.11.2 Test requirements
The coupler must run at 105% of the rated speed for 1 hour without load. It should run smoothly without any abnormality. 5
8 Inspection rules
MT/T923—2002
8.1 Factory inspection rules
Each coupler shall be subject to factory inspection. If any inspection item in the factory inspection does not meet the inspection requirements in Chapter 7, the coupler shall be judged as unqualified.
8.2 Type inspection rules
During the trial production and type identification, a formal trial-produced coupler sample may be used for type inspection. When the coupler is normally subjected to type inspection, the coupler used for type inspection must be randomly selected from the couplers (not less than two) that have passed the factory inspection. The inspection items must meet the requirements in Chapter 4, and the inspection results must meet the inspection requirements in Chapter 7. If any inspection item in the type inspection does not meet the inspection requirements in Chapter 7, the coupler shall be judged as unqualified. Date:
No.:
MT/T923—2002
Appendix A
(Suggested Appendix)
Factory Inspection Report of Regulating Speed Fluid Coupling Manufacturer:
Test Medium:
Inspection Items
Flexibility of Conduit Operation
Input Shaft
Seal Inspection
Vibration Inspection
Noise Inspection
No-load Power
Output Shaft
Other joints
Input end
Output end
Model:
Room temperature:
MT/T923-2002
Appendix B
(Appendix of suggestion)
System diagram of speed regulating hydraulic coupling test device X
1—motor; 2—torque speed meter: 3 test piece: 4-loading device: 5—thermometer: 6-pressure gauge; 7 oil filter: 8-cooler: 9—flow plate meter: 10—test instrument MT/T 923---2002
ISBN 7-5020-2193-0
Coal
Industry, Standard of the People's Republic of China
Test Specification for Speed Regulating Hydraulic Couplings for Coal Mines MT/T923-2002
Published by Meiyan Industry Press
(No. 35 Yaoju, Zhiyang District, Beijing 100029) Printed by Beijing Fangshan Honghua
Published by Beijing Publishing House of Xinhua Bookstore
Book size 880 ×1230mm1/16 sheet3/4
Word count15,000 words
Print run1-235
1st edition, September 2002
1st printing, September 2002
ISBN7-5020-2193-0/F652.2
All rights reserved. Violators will be prosecuted
If there are any quality problems such as missing pages, sample pages, or pages falling off, our company will be responsible for replacing them2 Rated efficiency
n=nteMte/(ngeMe）
Where:
- rated efficiency;
- input speed at rated slip (S=3%), r/min;
- output speed at rated slip (S=3%), r/min; Me- input torque at rated slip (S=3%), N·m; Mte- output torque at rated slip (S=3%), N·m. 7.10 Overtemperature test
7.10.1 Test method
Let the tested clutch reach 110% of the maximum allowable liquid temperature, and run it continuously at no-load for 5 minutes at rated speed. 7.10.2 Inspection requirements
(3)
(4)
·(5)
When the coupler liquid temperature reaches 110% of the maximum allowable liquid temperature, it shall run continuously at no-load for 5 minutes at the rated speed. There shall be no oil leakage at any joint or seal.
7.11 Overspeed test
7.11.1 Inspection method
Let the test piece run continuously at 105% of the rated speed for 1 hour. 7.11.2 Inspection requirements
The coupler must run continuously at no-load for 1 hour at 105% of the rated speed. It should run smoothly without any abnormality. 5
8 Inspection rules
MT/T923—2002
8.1 Factory inspection rules
Each coupler shall be inspected at the factory. If any inspection item in the factory inspection does not meet the inspection requirements in Chapter 7, the coupler is judged to be unqualified.
8.2 Type inspection rules
During the trial type identification, a formal trial coupler sample can be used for type inspection. When the coupler is normally subjected to type inspection, the coupler used for type inspection must be randomly selected from the couplers (not less than two) that have passed the factory inspection. The inspection items must meet the requirements in Chapter 4, and the inspection results must meet the inspection requirements in Chapter 7. If any inspection item in the type inspection does not meet the inspection requirements in Chapter 7, the coupler is judged to be unqualified. Date:
No.:
MT/T923—2002
Appendix A
(Suggested Appendix)
Factory Inspection Report of Regulating Speed Fluid Coupling Manufacturer:
Test Medium:
Inspection Items
Flexibility of Conduit Operation
Input Shaft
Seal Inspection
Vibration Inspection
Noise Inspection
No-load Power
Output Shaft
Other joints
Input end
Output end
Model:
Room temperature:
MT/T923-2002
Appendix B
(Appendix of suggestion)
System diagram of speed regulating hydraulic coupling test device X
1—motor; 2—torque speed meter: 3 test piece: 4-loading device: 5—thermometer: 6-pressure gauge; 7 oil filter: 8-cooler: 9—flow plate meter: 10—test instrument MT/T 923---2002
ISBN 7-5020-2193-0
Coal
Industry, Standard of the People's Republic of China
Test Specification for Speed Regulating Hydraulic Couplings for Coal Mines MT/T923-2002
Published by Meiyan Industry Press
(No. 35 Yaoju, Zhiyang District, Beijing 100029) Printed by Beijing Fangshan Honghua
Published by Beijing Publishing House of Xinhua Bookstore
Book size 880 ×1230mm1/16 sheet3/4
Word count15,000 words
Print run1-235
1st edition, September 2002
1st printing, September 2002
ISBN7-5020-2193-0/F652.2
All rights reserved. Violators will be prosecuted
If there are any quality problems such as missing pages, sample pages, or pages falling off, our company will be responsible for replacing them2 Rated efficiency
n=nteMte/(ngeMe）
Where:
- rated efficiency;
- input speed at rated slip (S=3%), r/min;
- output speed at rated slip (S=3%), r/min; Me- input torque at rated slip (S=3%), N·m; Mte- output torque at rated slip (S=3%), N·m. 7.10 Overtemperature test
7.10.1 Test method
Let the tested clutch reach 110% of the maximum allowable liquid temperature, and run it continuously at no-load for 5 minutes at rated speed. 7.10.2 Inspection requirements
(3)
(4)
·(5)
When the coupler liquid temperature reaches 110% of the maximum allowable liquid temperature, it shall run continuously at no-load for 5 minutes at the rated speed. There shall be no oil leakage at any joint or seal.
7.11 Overspeed test
7.11.1 Inspection method
Let the test piece run continuously at 105% of the rated speed for 1 hour. 7.11.2 Inspection requirements
The coupler must run continuously at no-load for 1 hour at 105% of the rated speed. It should run smoothly without any abnormality. 5
8 Inspection rules
MT/T923—2002
8.1 Factory inspection rules
Each coupler shall be inspected at the factory. If any inspection item in the factory inspection does not meet the inspection requirements in Chapter 7, the coupler is judged to be unqualified.
8.2 Type inspection rules
During the trial type identification, a formal trial coupler sample can be used for type inspection. When the coupler is normally subjected to type inspection, the coupler used for type inspection must be randomly selected from the couplers (not less than two) that have passed the factory inspection. The inspection items must meet the requirements in Chapter 4, and the inspection results must meet the inspection requirements in Chapter 7. If any inspection item in the type inspection does not meet the inspection requirements in Chapter 7, the coupler is judged to be unqualified. Date:
No.:
MT/T923—2002
Appendix A
(Suggested Appendix)
Factory Inspection Report of Regulating Speed Fluid Coupling Manufacturer:
Test Medium:
Inspection Items
Flexibility of Conduit Operation
Input Shaft
Seal Inspection
Vibration Inspection
Noise Inspection
No-load Power
Output Shaft
Other joints
Input end
Output end
Model:
Room temperature:
MT/T923-2002
Appendix B
(Appendix of suggestion)
System diagram of speed regulating hydraulic coupling test device X
1—motor; 2—torque speed meter: 3 test piece: 4-loading device: 5—thermometer: 6-pressure gauge; 7 oil filter: 8-cooler: 9—flow plate meter: 10—test instrument MT/T 923---2002
ISBN 7-5020-2193-0
Coal
Industry, Standard of the People's Republic of China
Test Specification for Speed Regulating Hydraulic Couplings for Coal Mines MT/T923-2002
Published by Meiyan Industry Press
(No. 35 Yaoju, Zhiyang District, Beijing 100029) Printed by Beijing Fangshan Honghua
Published by Beijing Publishing House of Xinhua Bookstore
Book size 880 ×1230mm1/16 sheet3/4
Word count15,000 words
Print run1-235
1st edition, September 2002
1st printing, September 2002
ISBN7-5020-2193-0/F652.2
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