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MT/T 681-1997: Reducer for belt conveyor for coal mining. Technical condition
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Reducer for belt conveyor for coal mining. Technical condition
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MT/T 681-1997
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PDF similar to MT/T 681-1997
Standard similar to MT/T 681-1997 MT/T 716 MT/T 661 MT 76 MT/T 717 MT 233 Basic data | Standard ID | MT/T 681-1997 (MT/T681-1997) | | Description (Translated English) | Reducer for belt conveyor for coal mining. Technical condition | | Sector / Industry | Coal Industry Standard (Recommended) | | Classification of Chinese Standard | D93;J81 | | Classification of International Standard | 53.040.20 | | Word Count Estimation | 10,195 | | Date of Issue | 12/30/1997 | | Date of Implementation | 6/1/1998 | | Summary | This standard specifies the coal belt conveyor reducer technical requirements and test content, requirements and methods. This standard applies to coal belt conveyor reducer. | MT/T 6: ---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Reducer for belt conveyor for coal mining.Technical condition
People's Republic of China Coal Industry Standard
Technical conditions of reducer for belt conveyor in coal mine
1997-12-30 Approved.1998-06-01 Implementation
Approved by the Ministry of Coal Industry of the People's Republic of China
Contents
1 Scope 1
2 Normative references 1
3 Technical requirements 1
4 Test method 4
5 Inspection rules 6
6 Marking, packaging, transportation, storage 7
Foreword
This standard mainly references ZBJ19009-88 "General technical conditions for cylindrical gear reducers" and MT 101-90 "for scraper conveyors
Reducer Inspection Specifications.
This standard is proposed by the Department of Science, Technology and Education of the Ministry of Coal Industry.
This standard is under the jurisdiction of the Standardization Technical Committee for Special Equipment for Coal Mine of the Ministry of Coal Industry.
This standard was drafted. Coal Research Institute Shanghai Branch.
The main drafters of this standard. Liu Chenyang, Chen Yu, Li Feng, Wang Yungen, Zhang Bochao.
This standard entrusts the Shanghai Branch of the China Coal Research Institute to interpret.
Technical conditions of reducer for belt conveyor in coal mine
1 Scope
This standard specifies the technical requirements and inspection contents, requirements, and methods of belt conveyor reducers for coal mines.
This standard applies to reducers for belt conveyors used in coal mines.
2 Reference standards
The following standards contain provisions that, through reference in this standard, constitute provisions of this standard. When this standard was published, the editions shown were all
Is effective. All standards will be revised, and all parties using this standard should explore the possibility of using the latest versions of the following standards.
GB/T 3077-88 Technical conditions for alloy structural steel
GB/T 3323-87 Radiography and quality classification of steel fusion welded butt joints
GB/T 3768-83 Simple method for determination of sound power level of noise sources
GB/T 9439-88 gray cast iron
GB/T 10095-88 involute cylindrical gear accuracy
GB/T 11365-89 Accuracy of bevel gears and hypoid gears
GB/* 11368-89 Cleanliness of gear transmission
MT/T 101-93 Inspection Specification for Reducer for Scraper Conveyor
ZBJ19004-88 cylindrical gear reducer
ZBJ19005-88 Cylindrical gear reducer loading test method
ZBJ19009-88 general technical requirements of cylindrical gear reducer
ZBJ19026-90 reducer for transportation machinery
Coal Mine Safety Regulations (92 edition)
3 Technical requirements
3.1 Conditions of use
3.1.1 The reducer shall meet the requirements of this standard and be manufactured in accordance with the drawings and documents approved by the prescribed procedures.
3.1.2 The working environment temperature of the reducer is -10 ~ 40 ℃; when the ambient temperature is lower than 0 ℃, the lubricating oil should be preheated accordingly.
3.1.3 The working conditions of the reducer shall comply with the provisions of the "Coal Mine Safety Regulations".
3.2 Service life
The service life of the reducer must not be less than.20000h, and the service life of the bearing must not be less than 5000h.
3.3 Sealing performance
The reducer must be free from oil leakage or oil leakage, and dirt and water must not be allowed to penetrate into the body.
3.4 Mechanical efficiency
Under rated load, the oil temperature of the reducer reaches the thermal equilibrium temperature, or the oil temperature of the reducer using internal water cooling is 75 ℃ ± 5 ℃
When the reducer is a hard toothed surface transmission, the efficiency of each stage is not less than 0.98; soft toothed surface transmission. the efficiency of each stage is not less than 0.965.
3.5 Body and cover
3.5.1 The box can be cast or welded. When casting, its mechanical properties must not be lower than HT200 in GB/T 9439.
3.5.2 The casting body and cover must not have casting defects such as slag inclusion, shrinkage, looseness, cracks, etc.
3.5.3 Weldments of weldments shall meet the requirements of Class I welds in GB/T 3323.
3.5.4 The casting body and cover need to be aged, and the welding body and cover need to be annealed.
3.5.5 The kerosene leakage test should be performed before the box assembly, and the box must not have oil leakage or oil leakage.
3.5.6 When the bonding surface of the machine body and the cover is in a free bonding state, the contact tightness of the bonding surface should be checked.
Stuffed.
3.5.7 After the body and the cover are closed, the edges should be flush, and the displacement of each side should not be greater than 2mm.
3.6 Gears and gear shafts
3.6.1 The main transmission parts shall be forgings, and the materials used shall comply with the requirements of GB/T 3077, and all shall have the manufacturer's certificate or the right
Inspection Qualification Form for the operation.
3.6.2 When the power of the reducer is less than 90kW, the accuracy of the three tolerance groups of the gear must not be lower than the level 8 specified in GB/T 10095
When the power is greater than or equal to 90kW, the accuracy of the third tolerance group of the gear must not be lower than level 7, and the accuracy of the first and second tolerance groups must not be lower than level 8.
3.6.3 Cylindrical gear inspection items shall comply with the requirements of Table 1, and other equivalent inspection item combinations are allowed.
Table 1
Tolerance group Ⅰ Tolerance group Ⅱ Tolerance group Ⅲ
Fr and Fw ff and fpt Fβ
1 When one of them is out of tolerance, the gear accuracy should be checked and accepted according to Fp.
2 Each inspection accuracy value is selected in accordance with GB/T 10095.
3.6.4 The contact spots on the tooth surface of the spur gear shall meet the requirements in Table 2.
Table 2
Contact spots,%
Accuracy class
Press height is not less than 65 65 65 65 55 (45) 50 (40) 45 (35) 40 (30)
Not less than 95 95 95 90 80 70 60 50
1 The values in parentheses are used for helical gears with axial coincidence ε 0.8.
2 The accuracy of each inspection shall be selected in accordance with GB/T 10095.
3.6.5 The minimum normal backlash of a spur gear shall meet the requirements in Table 3.
table 3
Center distance/mm Minimum normal limit backlash/μm Center distance/mm Minimum normal limit backlash/μm
≤80 120 315 ~ 400 230
80 ~ 125 140 400 ~ 500 250
125 ~ 180 160 500 ~ 630 280
180 ~ 250 185 630 ~ 800 320
250 ~ 315 210 800 ~ 1000 360
3.6.6 The inspection items of the bevel gear shall comply with the requirements in Table 4, and other equivalent inspection item combinations are allowed.
Table 4
Tolerance group Ⅰ Tolerance group Ⅱ Tolerance group Ⅲ
Gear gear pair gear gear pair gear gear pair
Fp and Fpk Fic Fpt and Fck Fskc Contact spots
3.6.7 The minimum normal limit backlash of the bevel gear is selected from class b specified in GB/T 11365, the maximum normal limit backlash and the minimum normal limit.
The value of backlash should meet the requirements of GB/T 11365.
3.6.8 The contact spots of bevel gears and hypoid gears should meet the requirements of Table 5.
table 5
Contact spots,%
Accuracy class
4 ~ 5 6 ~ 7 8 ~ 9
Not less than 60 50 35 along the tooth length
Not less than 65 55 50 along the tooth height direction
3.6.9 Tooth surface roughness Ra≤6.3μ.
3.6.10 After the gearbox has been rated for 1000 hours of durability under rated load, the gear teeth shall meet the requirements of Table 6.
Table 6
Remarks on identification criteria of serial number items
1 Wear
The gear is allowed to show slight or moderate wear.The amount of wear must not exceed the following requirements.
1. Hard tooth surface tooth wear of any tooth surface should not be greater than 0.13mm.
2. The amount of wear on any tooth surface of the soft tooth surface gear must not be greater than 1/20 of the tooth thickness.
3. The tooth surface of the gear with uneven wear, the difference between the two ends of the tooth surface should not be greater than 0.08mm.
2 Slight cementing is allowed on the glued tooth surface, and the glued area must not be greater than 1/4 of the tooth height; 1/3 of the tooth width
3 Pitting
Early tooth pitting is allowed on the tooth surface of the gear teeth, but the size of the pits and the area of the pitting pits must not exceed the following
Provisions.
1.For gears with a modulus of less than 6, the average diameter of pits must not be greater than 1mm; for teeth with a modulus of more than 6
The average diameter of wheels and pits shall not be greater than 2mm.
2.Pitting pit area is invalid when it reaches the following conditions.
a. When the width of the pitting area accounts for 80% of the tooth height;
b. The width of the pitting area accounts for 70% of the tooth height, and the length of the pitting area accounts for 10% of the tooth length;
c. The width of the pitting area accounts for 30% of the tooth height, and the length of the pitting area accounts for 40% of the tooth length
Average diameter = (maximum straight
Diameter min diameter) ÷ 2
4 No peeling of tooth surface of peeling wheel
5 Plastic deformation
1. Hard tooth surface gear teeth must not be plastically deformed.
2. The amount of plastic deformation of the soft tooth surface gear teeth must not be greater than 1/20 of the tooth thickness
6 Broken teeth must not break
7 No cracks in any part of the gear
8 Interference damage No interference damage to the tooth surface
3.7 Determination of bearing failure
After the 1000h durability assessment of the reducer under the rated load, the bearing should meet the requirements of Table 7.
Table 7
Remarks on identification criteria of serial number items
1 Wear
1. The bearing is allowed to wear lightly, and its wear coefficient f≤7.5.
2. There must be no obvious change in the shape of the raceway.
3. The raceway surface does not allow a dim appearance
f = v/e0
v. Clearance increment
e0. with bearing
ID-related values
2 Pitting
The inner and outer rings, rolling elements and cages of the bearing allow early pitting, but the size of pits and pitting pits
The area must not exceed the following requirements.
1. The average diameter of pits shall not be greater than 1mm, and the depth shall not be greater than 0.1mm.
2. The area of pitting pits must not be greater than 20% of the surface area of the part itself
Average diameter = (most
Large diameter minimum straight
Diameter) ÷ 2
3 All parts of the bearing must not be peeled off
4 All parts of the cracked bearing must not be cracked. Never allow the inner and outer rings of the bearing and the cage to break
5 glued bearings must not be glued
6 Plastic deformation of each part of the bearing must not occur plastic deformation
3.8 Lubrication and cooling of the reducer
3.8.1 Lubrication method and type of lubricating oil of the reducer, see Appendix A of ZBJ19009.
3.8.2 The oil temperature of the oil tank of the reducer shall not exceed 100 ℃, and the temperature rise of the oil temperature shall not exceed 80 ℃.
3.9 Assembly technical requirements
3.9.1 All parts and components shall be inspected in accordance with the requirements of their technical documents, and they may be assembled and used only after they are qualified.
3.9.2 Check the minimum backlash of the gear pair, contact spots and the axial clearance of each shaft component according to the standard or drawing requirements.
3.9.3 The reducer should run smoothly without impact.
3.9.4 After the reducer is assembled, no residues are allowed in the box, and the cleanliness shall meet the Class J requirements specified in GB/T 11368.
3.9.5 The operating noise value of the reducer below 160kW must not be greater than 90dB (A) (comprehensive noise), above 160kW (including 160kW)
The operating noise value of the reducer must not be greater than 92dB (A) (comprehensive noise).
3.9.6 The non-machined surface of the body, the inner wall of the cover and the parts located inside the reducer body shall be coated with oil and acid resistant paint. Body, machine
The surface of the cover and other exposed non-machined parts can be painted according to the relevant standards, and can also be painted according to user requirements.
4 Test method
4.1 Test prototype
The test prototype is a qualified product or prototype to be shipped.
4.2 Test bench
Test driving and loading methods and other devices are not limited. Priority is given to closed power streaming with lower energy consumption.
The main requirements for the inspection platform.
--- The load torque and speed are stable, and the fluctuation should not exceed ± 5%;
--- Can be loaded and unloaded during operation;
--- The installation of the tested reducer on the inspection device should conform to its working condition and tightening method.
4.3 Conditions to be met by all test instruments
4.3.1 The accuracy requirements of measuring instruments, meters and measuring tools are as follows.
--- Power. The accuracy of direct reading measurement is ± 0.5%, and the accuracy when measuring by sensor is ± 1.0%;
--- Torque. measurement accuracy is not less than ± 1%;
--- Rotation speed. measurement accuracy is not less than ± 0.5%;
--- Temperature. measurement accuracy is not less than ± 1% ± 1 last digit;
--- Noise. measurement accuracy is ± 1dB (A);
--- Measuring tool. Select the accuracy according to the tolerance range required by the test product drawing.
4.3.2 The measuring instruments, meters and measuring tools must be calibrated and calibrated according to relevant national standards and regulations, and have a validity
Inspection certificate.
4.3.3 Instruments should be placed in a constant temperature room during the test to ensure the stability of the test instruments.
4.4 Test items, procedures and requirements
See Table 8.
Table 8
Test item test content and method requirements
1 No-load test
a) The reducer runs continuously under no load until the oil temperature is balanced at the rated speed
until;
b) record room temperature;
c) After the motor starts to the rated speed, record the oil every 15 minutes
Temperature, the temperature rise of oil temperature within 1h does not exceed 1 ℃
balance;
d) Start to measure and record the input torque, rotation
Speed; output torque, speed; no-load power, housing temperature at the bearing,
Speed oil temperature
1) The rotation direction of the reducer must be the same as the working direction
the same;
2) running smoothly without impact and noise;
3) No oil leakage or oil leakage at each seal and joint
2 Efficiency test
a) After passing the no-load test, perform the efficiency test;
b) Increase by 10% of the rated load value until 100%, and load step by step
Test, each gear runs for 30min;
c) Record the speed and torque of each gear.
In three groups, take the arithmetic mean;
d) When the shaft output torque is 100% of the rated value, continue to run until the heat level
After the balance, the speed and torque are recorded from 10 minutes after the thermal equilibrium;
e) After the test, replace the new oil to the design oil level
1) Under rated load, the mechanical efficiency should meet the requirements of 3.4
Regulations;
2) Draw load-efficiency curve
3 Temperature rise test
a) Under rated load and rated speed, the reducer runs continuously until the oil
The temperature of the cell reaches thermal equilibrium;
b) Record the temperature of the oil sump every 15min, while monitoring and recording the shaft
Bearing temperature;
c) recording the ambient temperature;
d) Record the time required to reach thermal equilibrium
1) The maximum oil temperature of the reducer oil pool and the temperature rise of the oil pool should be
Meet the requirements of 3.8.2;
2) Continuous operation at rated load, oil temperature reached
The time required at 100 ℃ shall not be less than 3h;
3) When the reducer uses a forced cooling system, its cooling
But the parameters must meet the design requirements
4 Noise test
a) noise test at the same time as the rated load-efficiency test;
b) Measure the side and record the front, top and side of the reducer under test 1m
Noise at the place;
c) The side to be measured refers to the side away from the motor
1) Take the maximum noise value;
2) The maximum noise value of the reducer should meet the requirements of 3.9.5.
Regulations
5 overload test
a) At the rated speed, gradually and gradually load the
120%, run for 10min
b) Record input, output speed, torque and power
1) Normal operation, no abnormal noise or abnormal system
System vibration;
2) Open the cover for inspection, do not allow broken teeth, tooth surface pulling,
Phenomena such as indentation, gluing, pitting, etc.
Table 8 (continued)
Test content and method requirements
6 Endurance test
a) 1000h continuous operation at rated load and speed;
b) The oil temperature should be controlled below 80 ° C;
c) record the oil temperature every 1h;
d) Measure and record the plane, high-speed shaft and
Three-point vibration of vertical, axial and horizontal points at low speed shaft bearings
(For operation reference);
e) During the test, two oil changes are allowed;
f) Perform shutdown inspection at 500h and make detailed records. If the tooth surface is good
Or the tooth surface has local pitting, and the pitting is non-expanding pitting.
Keep experimenting
1) normal operation;
2) If there is abnormal vibration or noise during operation, etc.
It should be dismantled immediately;
3) When the shutdown inspection is performed at 500h, observe the gear meter
Surface. contact spots should meet the requirements of Table 2 and Table 5;
The pitting and cementation of the tooth surface should meet the requirements of 3.6.10
Provisions;
4) After the test, complete disassembly and inspection, and check the gears and bearings
And other major parts for comprehensive quality inspection. Gears each
The inspection indicators shall meet the requirements of 3.6.10. axis
The various indicators should be consistent with the provisions of 3.7;
5) Do not replace any parts during the test
5 Inspection rules
5.1 Inspection classification
There are two types of inspections for reducers for belt conveyors. type inspection and factory inspection. The inspection items are shown in Table 9.
Table 9
Inspection Item
Inspection type
Type inspection and factory inspection
1 No-load test √ √
2 Efficiency test √-
3 Temperature rise test √ √
4 Noise test √ √
5 Overload test √-
6 Endurance test √-
Note. "√" means inspection, "-" means no inspection.
5.2 Type inspection
5.2.1 Type inspection shall be carried out in one of the following cases.
--- When the national quality supervision agency proposes a type inspection requirement;
--- When the trial production of new or old products is transferred to the factory for trial production identification;
--- After the production is officially put into operation, if there are major changes in structure, technology and materials, which may affect product performance;
--- When the product is suspended for a long time, when it resumes production again;
--- Reducers produced in batches are sampled every 3 years;
--- When users have objections to product quality, when they ask for it.
5.2.2 Number of spot checks.
5.2.2.1 In the trial-type identification, a formal trial-produced reducer sample can be used for type test.
5.2.2.2 When carrying out the normal type test, one of them must be randomly selected from among the reducers (not less than two) that passed the factory inspection.
5.2.3 Inspection result determination and re-inspection rules.
The results of the type test meet the requirements in 4.4, the batch of reducers is qualified. Test results of any one test item
If the above requirements are not met, double inspections shall be carried out for re-inspection. The spot-checked reducer first runs for 3h at rated load, and then repeats the operation.
Check. If the re-inspection results meet the above requirements, the batch of products is qualified; otherwise, it is unqualified.
5.2.4 The type inspection report is proposed by the inspection unit. The inspection report is valid only after it has been signed by the technically centralized inspection center.
5.3 Factory inspection
5.3.1 Factory inspection and acceptance of reducer.
Each reducer should pass the inspection of the manufacturer's inspection department before passing the factory. The factory should meet the following requirements.
--- Perform factory inspection according to the inspection items specified in 5.1. If one item fails, the reducer is unqualified and must not
Leave the factory;
--- It should have a type inspection report that the model is qualified within the validity period;
--- Gear accuracy is qualified;
--- Cleanliness is qualified;
--- Gear tooth surface contact spots are qualified;
--- Tooth-side clearance and bearing clearance meet requirements;
--- Gear tooth surface hardness meets design requirements;
--- When the power is greater than 90kW, the transmission parts should be non-destructive testing;
--- Appearance is smooth and beautiful;
--- Random documents are complete.
5.3.2 The accuracy of the measuring instrument used for factory inspection is allowed to be lower by one level than that required in Section 4.3.1.
6 Marking, packaging, transportation, storage
6.1 The reducer shall fix the product label in an obvious position, and the label content shall include.
a) product name and model;
b) input power;
c) output speed;
d) nominal transmission ratio;
e) the name of the manufacturer and the date of manufacture;
f) Factory number.
6.2 The shaft extension and key of the reducer shall be coated with rust-proof grease, tightly wrapped with plastic cloth and tied firmly. Spare gears, shafts and bearings should be greased.
6.3 The reducer should be stable and fixed in the packing box with waterproof petroleum asphalt linoleum or installed on the footboard.
6.4 In the process of transportation and lifting, it should be smoothly lifted and slowly released to ensure that the product is not damaged.
6.5 Pay attention to waterproof and moisture-proof during transportation and storage.
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