This standard specifies the content, inspection methods and judgment criteria of underground industrial tests for fully-mechanized scraper conveyors in coal mines. This standard applies to various types of scraper conveyors (hereinafter referred to as conveyors) used in fully-mechanized mining in MT15. MT/T 497-1995 Specification for underground industrial tests of fully-mechanized scraper conveyors MT/T497-1995 Standard download decompression password: www.bzxz.net

Coal Industry Standard of the People's Republic of China
Subject Content and Scope of Application of Specification for Underground Industrial Test of Comprehensive Scraper Conveyor
MT/T497—1995
This standard specifies the content, inspection method and judgment criteria of underground industrial test of comprehensive scraper conveyor in coal mines. This standard is applicable to various types of scraper conveyors (hereinafter referred to as conveyors) used for comprehensive mining in MT15. 2 Reference standards
GB3836.1 General requirements for explosion-proof electrical equipment for explosive atmospheres
GB3836.2 Explosion-proof electrical equipment for explosive atmospheres Flameproof electrical equipment "d" GB3836.3 Explosion-proof electrical equipment for explosive atmospheres·Increased safety electrical equipment "e" GB3836.4 Explosion-proof electrical equipment for explosive atmospheres Intrinsically safe circuits and electrical equipment "i" 3 Terms
3.1 Actual conveying capacity Q
After the conveyor is laid on the underground test working face and operates normally, when the coal mining machinery mines coal at the actual production capacity, the hourly conveying capacity of the scraper conveyor, t/h.
3.2 Actual laying length L
The actual length of the conveyor laid on the underground test working face, m. 3.3 Chain speed
The average moving speed of the scraper chain measured, m/s. 3.4 Idle power P.
After the conveyor is laid underground, the average value of the motor input power when the conveyor is running idle, under the condition that the scraper chain is pre-tightened to the minimum chain pre-tension required for rated power operation, in kW. 3.5 Load power P
The average value of the motor input power when the conveyor is under load, in kW. 3.6 Load index C.
The motor power consumed by the conveyor for transporting each ton of coal, that is, the total power of the conveyor to move coal divided by the amount of coal loaded on the entire length of the conveyor, in kW/t.
3.7 The terms "weight per meter of scraper chain", "weight per meter of load", "idle operation index", "coal return amount" and "coal return index" refer to Articles 4.6, 4.7, 4.8, 4.10 and 4.11 of the standard MT/T104. 3.8 Coal passing capacity of the whole machine
The total amount of coal transported from the beginning of normal operation of the conveyor to failure, in 10,000 tons, an index representing the service life (life) of the conveyor. 3.9 Chain wear velocity U
The average wear of the straight edge of the vertical ring of the round link chain when the conveyor transports 100,000 tons of coal, mm/100,000 tons. 3.10 Wear velocity of the middle plate and the groove side of the middle groove (Ve1, c2) When the conveyor transports 100,000 tons of coal, the average wear of the middle plate and the groove side of the middle groove is called the middle plate wear velocity and the groove side wear velocity, respectively, mm/100,000 tons.
3.11 Sprocket wear velocity Vo
MT/T 497—1995
The average wear of the sprocket in the length direction of the chain nest when the conveyor transports 100,000 tons of coal, mm/100,000 tons. 4 Underground industrial test
4.1 All new conveyor products that are finalized and identified shall be subjected to underground industrial tests. 4.2 Underground industrial tests of products shall be conducted after their main components have passed factory inspection. 4.3 Minimum underground industrial test time and coal mining volume of conveyors After the conveyor is installed, the minimum underground industrial test duration shall be 3 months from the official start of production of the underground working face, and the cumulative coal transportation shall be more than 100,000 tons. When the requirements of Article 5.2.4 are met, the inspection items specified in this specification can be carried out.
5 Preparation work
5.1 Preparation of technical data
Before the product is subjected to underground industrial tests, the following technical data shall be available: operation and maintenance instructions;
factory quality inspection report and product certificate; technical documents on the industrial surface conditions of underground industrial tests (geology, ventilation, power supply, water supply conditions and technical characteristics of supporting equipment, etc.) c.
d. Test outline of underground industrial tests of products. 5.2 Instrumentation preparation
5.2.1 The measurement accuracy of the underground industrial test of the conveyor shall refer to Article 5 of MT/T104, and the instrument accuracy is allowed to be reduced by one level. 5.2.2 The electrical instruments used for the underground industrial test of the conveyor shall comply with the relevant provisions of GB3836.1~3836.4, and have an "Explosion-proof Certificate" issued by the national designated explosion-proof testing center. When the underground conditions permit and safety measures are taken, ordinary electrical instruments can be used after approval by the security inspection departments at the bureau and mine levels.
5.2.3 Instrumentation for underground industrial testing: a
voltage sensor;
power sensor;
paper tape recorder, accuracy 1%;
chain pretension meter;
handheld tachometer;
tape measure and vernier caliper;
weighing instrument,
stopwatch.
5.3 Check the power supply quality
5.3.1 Before underground industrial testing, measure and calculate the power supply voltage of the power grid and the rated voltage of the motor. The percentage of the instantaneous voltage drop at motor starting should not be greater than 20%. Underground industrial testing should be carried out under the conditions of stable power supply quality and stable motor characteristics. The calculation formula is as follows: Ui—U?
2 × 100% ≤ 20%
U—U?
× 100% ≤20%
Where: U,-
Measured no-load voltage of the power grid, V;
Measured instantaneous voltage of the conveyor motor at starting, V; - rated voltage of the conveyor motor, V.
5.3.2 Measurement method:
MT/T 497—1995
Connect the voltage sensor to the spare socket of the conveyor feeder switch, connect the recording instrument, start and stop the conveyor, and then measure the no-load voltage of the power grid and the instantaneous starting voltage of the conveyor motor. The rated voltage of the motor is given by the product manufacturer. 5.4 Inspection and adjustment before test and inspection
Check whether the design and manufacture of the whole machine and parts meet the standards listed in Article 2; a.
b, "Check the laying of the conveyor to see if it meets the overall requirements of the product; whether the parts are installed correctly, completely and intact; whether all bolts are tightened and reach the specified torque; whether the overlap between the conveyor and the transfer machine is reasonable; whether the matching installation with the coal mining machine and hydraulic support is correct; whether the traction rack or chain rail is installed correctly and intact, etc. For those that do not meet the requirements, adjust them to meet the overall and whole machine design, t.
Investigate the tightness of the chain. When the conveyor is operating normally, the completely relaxed chain link No more than two chain links, otherwise adjust appropriately according to the chain adjustment method in Article 6.5 of MT/T104; d. Check the filling volume of the hydraulic coupling. If it is unreasonable, adjust the reasonable filling volume of the coupling according to the adjustment method in Article 6.7 of MT/T104.
6 Underground industrial test detection and statistical items
Detect chain pretension;
Detect actual conveying volume;
Detect idling power;
Detect load power and power distribution value;
Detect return coal volume and return coal power,
Detect chain wear speed;
Detect wear speed of middle groove middle plate and groove side; Detect sprocket wear Speed;
Inspect the rationality of the matching of the conveyor and the working surface equipment, accident statistics:
Maintenance statistics.
Detect chain pretension
Judgment rules
The measured and calculated average pretension value F of the conveyor chain should not be greater than the calculated value of the formula in Appendix A of MT/T105. This value is the reasonable pretension of the conveyor. The calculation formula is as follows: F
F+F+F3
Where: F—measured and calculated average pretension of the conveyor chain, kN; F,—-measured pretension of the chain at 15m from the head, kN; Fz—measured pretension of the chain at 15m from the tail, kN; F: Measure the pretension of the middle chain of the conveyor, kN; T—pretension calculated by the formula in Appendix A of MT/T105, kN. Note: In formula (3), F, F, and F are the measured pretension of the conveyor chain. For double-chain conveyors, their values ​​are the sum of the measured pretension of the two chains. 7.2 Measurement method
Measure the pretension of each part of the chain by the measurement method in 7.1.2 of MT/T104. 8 Detecting the actual conveying volume
8.1 Judgment rules
Measure the traction speed, cutting depth and mining height of the coal mining machine (coal plow) and the chain speed of the conveyor, and calculate the production capacity of the coal mining machine (coal plow), 320
MT/T 497--1995
The effective speed of the conveyor and the load weight per unit length of the conveyor are used to calculate the actual conveying capacity of the conveyor, which should be similar to the production capacity of the coal mining machine (coal plow) and not greater than the designed conveying capacity. The calculation formula is as follows: Q,- 60ahur
Where: Q-
Where: 2
Production capacity of coal mining machine (coal plow), t/h; cutting depth of coal mining machine (coal plow), m;
The mining height of a coal mining machine (coal plow) at one time, m; traction speed of coal mining machine (coal plow), m/min; bulk density of solid coal, t/m2.
（4）
Effective conveyor speed, m/s; when the coal mining machine (coal plow) and the conveyor run in the same direction, take the "\" sign; when they are opposite, take the "+" sign;
Actual conveyor chain speed, m/s;
has the same meaning as before.
Where: 91-
Load weight per unit length of the conveyor, kg/m; Q1.U2 symbols have the same meaning as before.
Where: Q——actual conveyor capacity, t/h. 3600
3. 6 qi ~ Q1
（6）
When the traction speed of the coal mining machine (coal plow) is the actual maximum traction speed and is opposite to the running direction of the conveyor, the Q value is the maximum value Qmax, otherwise the Q value is the minimum value Qmin. Therefore, the actual conveying capacity of the conveyor should be taken as its average value, that is, Qm +Qnin ~ Q
q1, the symbols have the same meaning as before.
8.2 Measurement method
Use a tape measure to directly measure the cutting depth and mining height of the coal mining machine (coal plow); use the method in 7.1.3 of MT/T104 to measure the conveyor chain speed; · (8)
Use a stopwatch to count the upward and downward coal cutting time of the coal mining machine (coal plow), and calculate the traction speed of the coal mining machine (coal plow). Calculation formula L
Where: Li--actual length of the working face, m; t--coal mining machine (coal plow) The time taken by the conveyor to cut coal up (down) is s. The symbol Ui has the same meaning as before.
d. Use formulas (4) to (8) to obtain the actual conveying capacity of the conveyor. 9 Detection of idling power
(9)
9.1 Judgment rule
Measure the idling power of the conveyor and the laying length of the conveyor, and obtain the idling index of the conveyor, which should not be greater than the value specified in this standard. As shown in Table A1.
The calculation formula for the idling index is as follows:
C. = P. /L
（10）
Where: Co-
Conveyor idling index, kW/m;
MT/T 497—1995
Conveyor idling motor input total power, kW; L——actual laying length of conveyor, m. 9.2 Measurement method
Connect the power sensor to the circuit between the conveyor motor and the flameproof switch, connect the paper tape recorder, and run the conveyor idling, that is, record the conveyor idling power value on the paper tape recorder. 10 Detection of load power and power distribution value
10.1 Judgment rules
a. Measure the conveyor load power, the load per unit length of the conveyor, calculate the total power of the conveyor to move coal and the amount of coal loaded on the entire length of the conveyor to obtain the conveyor load index, which should not be greater than the index specified in this standard, as shown in Table A1. The calculation formula is as follows: P P.-P.
Where: P—Total power of a conveyor moving coal, kW; P. Actual conveyor load power, kW;
P. Symbols have the same meaning as before.
Where: Q. Coal loading on the entire length of the conveyor, t; 91 and L symbols have the same meaning as before.
Where: C—Conveyor load index, kW/t; P and Q symbols have the same meaning as before.
(12)
b. The actual average power of the head motor and the tail motor, and the power distribution ratio of the head and tail motors should not be greater than the judgment index specified in this standard. As shown in Table A1, the calculation formula is as follows: P
Where: K—Conveyor head and tail motor power distribution ratio; Pi——Actual average power of the head motor, kW; P.—-Actual average power of the tail motor, kW. 10.2 Measurement method
(14)
According to Article 9.2, connect the power sensor and paper tape recorder to record the load power value of the conveyor when the coal cutter (coal plow) is cutting coal upward and downward, and obtain the average value of the conveyor load power. According to formula (11), calculate the total power of the conveyor to move coal. According to Article 8, measure and calculate the load weight per unit length of the conveyor, obtain the coal loading on the entire length of the conveyor, and calculate the load index of the conveyor according to formula (13).
According to the average power of the head motor and the tail motor, calculate the power distribution rate of the conveyor according to formula (14). 11 Detection of return coal volume and return coal power
11.1 Judgment rules
a. The measured hourly return coal volume of the conveyor shall not exceed 3% of the measured conveying volume for ordinary end-unloading conveyors and shall not exceed 2% of the measured conveying volume for side-unloading or bottom-sealed end-unloading conveyors.
Measure the total power of the motor at the moment when all the coal on the conveyor is separated from the head sprocket when the coal mining machine stops loading coal, calculate the coal return power of the conveyor b.
, and the coal return index should not be greater than the value specified in this standard, as shown in Table A1. The calculation formula is as follows: PH Pso - P.
(15)
Where: Pu--coal return power of the conveyor, kW; MT/T 497—1995
Total power of the motor at the moment when all the coal on the conveyor is separated from the head sprocket, kW; Pso
P. The meaning of the symbols is the same as before.
-coal return index of the conveyor, kW/m;
Where CH—
NH and L have the same meaning as before.
11.2 Measurement method
·(16)
a. At the tail of the conveyor, spread the coal manually and weigh it with a scale. Collect the weight of the coal brought back by the lower chain for 1 hour to obtain the hourly coal return volume. b. Use the method in 9.2 to connect the power sensor and paper tape recorder to record the total power value of the motor at the moment when the coal mining machine stops cutting coal and all the coal on the conveyor is separated from the head sprocket. According to formulas (15) and (16), the coal return power and coal return index of the conveyor are obtained. 12 Detection of chain wear speed
12.1 Judgment rule
After the conveyor has been operating normally for three months, measure the average wear of the straight edge of the vertical ring of the round link chain and the chain link pitch, and calculate the total weight of the transported coal. It is found that the chain wear speed is not more than 0.4mm/100,000t, and the chain link pitch elongation is not more than 2.5%. The calculation formula is as follows: U
Where: u.
Chain wear rate, mm/100,000 tons;
Average wear of the straight edge of the vertical ring of the circular chain, mm; Q—total weight of coal actually transported by the conveyor, 10,000 tons; 8—link pitch elongation, %;
Average pitch of a link before use, mm;
Average pitch of the link actually measured, mm.
12.2 Measurement method
× 100
·(17)
·（18）
Select any vertical ring as the starting point, and select two vertical rings every 80m (or 60m, depending on the laying length). Use a caliper to measure the wear outer diameter and pitch of the straight edges of the three rings, and calculate the average wear amount and average pitch of the chain ring; measure the working face advancement distance, mining height and working face length, calculate the product with the bulk density of the raw coal, and obtain the actual coal transported by the conveyor b.
weight.
According to formulas (17) and (18), calculate the chain wear rate and chain link pitch elongation. 13 Detection of wear rate of the middle plate and groove side of the middle trough 13.1 Judgment rules
Measure the average wear of the middle plate and groove side of the middle trough, the total weight of the coal transported by the conveyor, and find that the wear rate of the middle plate and groove side of the medium-sized and above conveyor is not more than 0.7mm/100,000t. 10a2
Where: Ven
Wear rate of the middle plate of the middle trough, mm/100,000t; Wear rate of the groove side of the middle trough, mm/100,000t; Average wear of the middle plate of the middle trough, mm;
（19）
（20）
MT/T 497—1995
Average wear of the groove side of the middle trough, mm;
Q, the meaning of symbols are the same as before.
13.2 Measurement method
Mark the first section of the middle groove at the head and tail of the conveyor and the middle section of the middle groove in the middle of the body in advance, and record the original dimensions of the middle plate and the groove side chainway;
b. Use a measuring tool to measure the wear depth of the middle plate interface and the groove side chainway at the end of the three marked middle grooves, and calculate the average wear depth of the middle plate and the groove side, which is the wear amount of the middle plate and groove side of the middle groove. Use 12.2 to calculate the actual weight of coal transported by the conveyor. c.
Use formulas (19) and (20) to calculate the wear speed ci and Uc2 of the middle plate and groove side of the middle groove. d.
14 Detect the wear speed of the sprocket
14.1 Judgment rules
After the conveyor has been operating normally for three months, measure the average wear of the sprocket chain nest in the length direction, the total weight of the coal transported by the conveyor, calculate the average wear of a single sprocket tooth, and obtain the sprocket wear rate is not greater than 0.5mm/100,000t. The calculation formula is as follows: &
Wu Zhong: Uo-
-Conveyor sprocket wear rate, mm/100,000t; Average wear of conveyor sprocket teeth, mmQ. The symbol has the same meaning as before.
14.2 Measurement method
.(21)
Use a special measuring tool to measure the length of the head and tail sprocket chain nests respectively, take the average value, subtract the length of the factory sprocket chain nest, and divide the difference by 2 to obtain the average wear of a single sprocket tooth; b. Use the method in 12.2 to obtain the actual weight of coal transported by the conveyor. c. Use formula (21) to obtain the sprocket wear rate Vo. 15 Check the rationality of the matching of the conveyor and the working face equipment. Through installation and actual operation, check whether the conveyor can meet the requirements of the coal mining machine to smoothly cut coal and open the machine nest, and whether it can meet the working requirements of the hydraulic support and the transfer machine.
16 Accident statistics
During the underground industrial test, the conveyor accidents and treatment methods were counted according to the following table, and the accident rate and accident impact time of the conveyor were calculated. Table 1 Statistics of accidents during underground industrial test of conveyor Time
Number of accidents
Inspector:
Handling method and occupied time
Middle trough
Person in charge:
17 Maintenance statistics
Accident rate
MT/T 497--1995
Total number of conveyor accidents
Total number of accidents at working face
Accident time ratio:
X 100%
Total time of conveyor accidents
Total time of accidents at working face
(22)
...(23)
During the underground industrial test, the number and content of conveyor maintenance, the time of component replacement, and the amount of coal passed by the whole machine and components were counted according to the table below.
Table 2 Statistics of underground industrial test and maintenance of conveyor Number of maintenance times
Inspector:
Maintenance time
Parts name
18 General judgment principle of underground industrial test and inspection results Maintenance content
Replacement of parts
Time
Amount of coal passed
Parts
Responsible person:
18.1 If any item of the underground industrial test and inspection of the conveyor specified in this standard does not comply with the provisions of this standard, the conveyor underground industrial test and inspection shall be judged as unqualified. 18.2 If a single item of the underground industrial test of the conveyor fails due to an accident or improper use and management, it is allowed to retest after processing and replacement of parts. If it meets the provisions of this standard, it is still judged as qualified for the underground industrial test and inspection. 18.3 During the underground industrial test, if the conveyor can meet the requirements of the supporting equipment of the working face, the accident rate of the conveyor is not more than 55%, the accident time ratio is not more than 65%, and the number of parts repairs and replacement time are within the allowable range specified by the product, the conveyor is judged to have passed the underground industrial test, otherwise it is unqualified.
19 The inspection report of the underground industrial test of the conveyor includes: the name and model of the conveyor, the manufacturer, the factory number, the name of the working face of the test bureau mine, the test date, the description of the test equipment, the inspection items, the name, manufacturer and number of the test instrument, the calibration results, the record form, the judgment of the test items and the overall quality judgment, the calibration unit and the calibration date, the signature and seal of the test personnel, the auditor, the project leader, the person in charge of the testing unit, and the seal of the testing unit. 325
Super heavy
MT/T497—1995
Conveyor underground industrial test power determination index table Appendix A
No-load index, kW/m
Side double chain
Middle double chain
Load index, kw/t
Side double chain
Middle double chain
Coal return index, kW/m
Excitation rate
Side unloading head
Two transmissions
Side double chain Middle double chain bottom
0. 0180. 020
0.0121.25
0.0220.0240.0161.25
0.0260.0280.0201.25
Note: ①The values ​​on both sides of the oblique line in the table are the judgment indicators of the corresponding trough width conveyor. ②The load index of the single-chain conveyor is similar to that of the double-chain conveyor, and the empty load index is 0.8 times that of the double-chain. Additional notes:
This standard is proposed by the Coal Mine Special Equipment Standardization Technical Committee of the Ministry of Coal Industry. This standard is under the jurisdiction of the Scraper Conveyor Branch of the Coal Mine Special Equipment Standardization Technical Committee. This standard was drafted by the Taiyuan Branch of the China Coal Research Institute. The main drafters of this standard are Shi Guoxiang and Chang Yuwen. This standard is entrusted to the Taiyuan Branch of the China Coal Research Institute for interpretation. 3263 During the underground industrial test, if the conveyor can meet the requirements of the supporting equipment of the working face, the accident rate of the conveyor is not more than 55%, the accident time ratio is not more than 65%, and the number of parts repairs and replacement time are within the allowable range specified by the product, the conveyor is judged to be qualified for the underground industrial test, otherwise it is unqualified.
19 The underground industrial test inspection report of the conveyor includes: conveyor name and model, manufacturer, factory number, test bureau mine working face name, test date, test equipment description, inspection items, test instrument name, manufacturer, number, calibration results, record form, judgment of test items and overall quality judgment, calibration unit and calibration date, signature and seal of the inspection personnel, auditor, project leader, and person in charge of the inspection unit, and seal of the inspection unit, etc. 325
Super heavy
MT/T497—1995
Conveyor underground industrial test power determination index table Appendix A
No-load index, kW/m
Side double chain
Middle double chain
Load index, kw/t
Side double chain
Middle double chain
Coal return index, kW/m
Excitation rate
Side unloading head
Two transmissions
Side double chain Middle double chain bottom
0. 0180. 020
0.0121.25
0.0220.0240.0161.25
0.0260.0280.0201.25
Note: ①The values ​​on both sides of the oblique line in the table are the judgment indicators of the corresponding trough width conveyor. ②The load index of the single-chain conveyor is similar to that of the double-chain conveyor, and the empty load index is 0.8 times that of the double-chain. Additional notes:
This standard is proposed by the Coal Mine Special Equipment Standardization Technical Committee of the Ministry of Coal Industry. This standard is under the jurisdiction of the Scraper Conveyor Branch of the Coal Mine Special Equipment Standardization Technical Committee. This standard was drafted by the Taiyuan Branch of the China Coal Research Institute. The main drafters of this standard are Shi Guoxiang and Chang Yuwen. This standard is entrusted to the Taiyuan Branch of the China Coal Research Institute for interpretation. 3263 During the underground industrial test, if the conveyor can meet the requirements of the supporting equipment of the working face, the accident rate of the conveyor is not more than 55%, the accident time ratio is not more than 65%, and the number of parts repairs and replacement time are within the allowable range specified by the product, the conveyor is judged to be qualified for the underground industrial test, otherwise it is unqualified.
19 The underground industrial test inspection report of the conveyor includes: conveyor name and model, manufacturer, factory number, test bureau mine working face name, test date, test equipment description, inspection items, test instrument name, manufacturer, number, calibration results, record form, judgment of test items and overall quality judgment, calibration unit and calibration date, signature and seal of the inspection personnel, auditor, project leader, and person in charge of the inspection unit, and seal of the inspection unit, etc. 325
Super heavy
MT/T497—1995
Conveyor underground industrial test power determination index table Appendix A
No-load index, kW/m
Side double chain
Middle double chainbZxz.net
Load index, kw/t
Side double chain
Middle double chain
Coal return index, kW/m
Excitation rate
Side unloading head
Two transmissions
Side double chain Middle double chain bottom
0. 0180. 020
0.0121.25
0.0220.0240.0161.25
0.0260.0280.0201.25
Note: ①The values ​​on both sides of the oblique line in the table are the judgment indicators of the corresponding trough width conveyor. ②The load index of the single-chain conveyor is similar to that of the double-chain conveyor, and the empty load index is 0.8 times that of the double-chain. Additional notes:
This standard is proposed by the Coal Mine Special Equipment Standardization Technical Committee of the Ministry of Coal Industry. This standard is under the jurisdiction of the Scraper Conveyor Branch of the Coal Mine Special Equipment Standardization Technical Committee. This standard was drafted by the Taiyuan Branch of the China Coal Research Institute. The main drafters of this standard are Shi Guoxiang and Chang Yuwen. This standard is entrusted to the Taiyuan Branch of the China Coal Research Institute for interpretation. 326
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