Some standard content:
MT/T 779-1998
This standard is formulated to adapt to the development of the design and production of domestic column winches and to facilitate the standardization and serialization of such products. This standard is proposed by the Industry Management Department of the State Coal Industry Bureau. This standard is under the jurisdiction of the Coal Industry Coal Mine Special Equipment Standardization Technical Committee. The drafting unit of this standard: Zhunan Coal Mine Machinery Factory The main drafters of this standard: Liu Zhiyong, Fan Zhengquan, Wang Zhiwei. This standard is entrusted to the Auxiliary Transportation Equipment Branch of the Coal Mine Special Equipment Standardization Technical Committee for the interpretation of this standard. 77
Coal Industry Standard of the People's Republic of China
Drawing hoist
MT/T 779—1998
This standard specifies the classification and naming, requirements, test methods, inspection rules, marking, packaging, transportation and storage of column winches (hereinafter referred to as winches).
This standard applies to winches used in environments with coal dust or explosive gases. 2 Reference 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. GB 3836. 1—1983
General requirements for explosion-proof electrical apparatus for explosive atmospheresExplosion-proof electrical apparatus for explosive atmospheresFlameproof electrical apparatus "d" GB 3836. 2—1983
GB/T10089-1988Precision of cylindrical worm and worm gearGB/T 10095-1988
Precision of involute cylindrical gears
GB/T 13306---1991
GB/T 13384—1992
General technical conditions for packaging of electromechanical products
"Safety Regulations for Coal Mines" formulated by the Ministry of Energy of the People's Republic of China in 1992 3 Classification and naming
3.7 The type of winch is single-shell winding type, using worm gear reducer and open gear transmission. 3.2 Product model:
Revision serial numberbzxz.net
Average static tension of wire rope, unit 10kN
3.3 The basic parameters of the winch shall comply with the provisions of Table 1. Approved by the State Coal Industry Bureau on November 10, 199878
Implementation on April 1, 1999
Average static tension of wire rope, kN
Average rope speed of wire rope, m/s
Wire rope
4 Requirements
Diameter, mm
Rope capacity, m
Diameter, mm
Nominal tensile strength, MPa
4.1 Basic requirements
MT/T 779—1998
Rope 6×19
The winch shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 4.2 Working conditions
4.2.1 The ambient temperature is -10～+40℃; 4.2.2 The relative humidity of the environment shall not exceed 95% (+25℃), JH-20
JH-26(28)
260(280)
4.2.3 The methane, coal dust, hydrogen sulfide, carbon dioxide, etc. in the surrounding air shall not exceed the safety content specified in the "Coal Mine Safety Regulations"; 4.2.4 The working system is a low-speed heavy-load non-continuous type. 4.3 Performance
4.3.1 The winch should run smoothly and reliably, and the transmission device and bearings should not have abnormal vibration and sound during operation. 4.3.2 When the winch is running under rated load, the temperature rise of the reducer lubricating oil shall not exceed 60℃, and the maximum oil temperature shall not exceed 80℃. 4.3.3 The winch reducer shall not have oil leakage. 4.3.4 The winch base has holes for convenient fixed installation and is adapted to the tension. 4.3.5 The same type of winch parts should be interchangeable. 4.4 Safety, hygiene and environmental protection
4.4.1 The winch should comply with the relevant provisions of the "Coal Mine Safety Regulations". 4.4.2 The flanges of the rope retaining plates at both ends of the winch drum should be 2.5 times higher than the diameter of the outermost wire rope. 4.4.3 The electrical equipment of the winch should comply with the provisions of GB3836.1 and GB3836.2, and must be subjected to explosion-proof inspection by the National Product Quality Inspection Center and obtain an inspection certificate. 4.4.4 The noise value of the winch in working condition should not exceed the provisions of Table 2. Table 2
Noise value, dB(A)
4.4.5 The transmission part of the winch should have a safety protection device. 4.5 Manufacturing and assembly requirements
JH-26(28)
4.5.1 The accuracy of the cylindrical gear of the winch shall not be lower than the 9-9-8 level specified in GB/T 10095--1988. The accuracy of the cylindrical and cylindrical worm and worm wheel shall comply with the 8 level specified in GB/T10089-1988. 4.5.2 The materials and purchased parts used in the winch shall comply with the relevant national and industrial standards and have a certificate of conformity. Outsourced parts shall comply with the requirements of the drawings and may only be used after passing the inspection. 4.5.3 The surface roughness of the rim of the rope baffle at both ends of the drum shall not exceed 5%. 4.5.4 All parts shall be cleaned of burrs and flash before assembly. The mold sand in the reduction box shall be cleaned up, and no iron filings, oxide scale and other debris are allowed. 79
MT/T 779-1998
After cleaning, it shall be painted with resistant paint. The cleanliness of the reducer shall not exceed the requirements of Table 3. Table 3
Cleanliness, mg
Note: Use 80 mesh filter to check.
4.5.5 All fasteners should be connected reliably and should not be loose. The screws on the drum shall not be higher than the circumferential surface of the drum. 4.6 Appearance quality requirements
JH-26(28)
4.6.1 The burrs and sharp edges on the surface of each component shall be scraped and polished, and iron filings, rust, welding slag, oxide scale and oil stains shall be cleaned. 4.6.2 The winch shall be painted according to the following requirements:
a) The exterior surface shall be painted with gray enamel;
b) The space for the drum to accommodate rope shall be painted with dark red paint; c) The lubrication points and explosion-proof signs shall be painted with red enamel; d) The paint shall be evenly applied, and defects such as missing paint, pinholes, bubbles, cracks, shedding, and sagging are not allowed. 4.7 Scope of supply of complete sets of winches (excluding wire ropes and cables) 4.7.1 Finished winches equipped with electric motors.
4.7.2 Electronic control equipment that complies with the product use and maintenance instructions. 4.7.3 Random tools specified in the product drawings. 4.7.4 Random technical documents.
5 Test methods
5.1 Idle running test
The winch should be tested for 15 minutes in both the forward and reverse directions, and the following should be checked: a) Smooth running, no abnormal sound, no impact noise; b) All connecting parts and fasteners are not loose; c) There is no oil leakage at the sealing;
d) The screws on the drum meet the requirements of 4.5.5; e) When the wire rope moves a distance of not less than 10m, use a stopwatch to detect the maximum and minimum rope speeds of the wire rope, take the average value, and it meets the requirements of Table 1.
5.2 Load test
Carry out load test by vertically lifting heavy objects: a) Use 50% of the rated load for forward and reverse tests, the number of times shall not be less than 3 times each; b) Use 75% of the rated load for forward and reverse tests, the number of times shall not be less than 3 times each; c) Use the rated load for forward and reverse tests, the number of times shall not be less than 5 times each; d) Use 120% of the rated load for forward and reverse tests once each, e) The vertical lifting height shall not be less than 5m.
6 Inspection rules
6.1 Each winch must be inspected and qualified by the quality inspection department of the manufacturer before it can leave the factory, and a product certificate shall be attached when leaving the factory. 6.2 The types, items, methods and requirements of winch inspection are shown in Table 4.80
Inspection items
Manufacturing and assembly requirements
Appearance quality
Idle running test
No-load test
Basic parameters
Performance
Cleanliness
Electrical equipment
Scope of complete set supply
Note: “^” indicates mandatory inspection items
MT/T 779—1998
Methods and requirements
4.5 (Except Table 3)
Visual method, 4.6
Measure the sound level meter at the front, rear, left, right and top points 1m away from the winch and at the same height as the sound source using the A-level slow gear and take the average value; 4.4.4 Weighing method, 4.5.4
Visual method, 4.7
6.3 Type inspection should be carried out in the following cases: a) when new products are trial-produced or old products are transferred to other factories for production; b) when changes in design, process or materials affect product performance; c) when production is stopped for more than 3 years and then resumed; d) when batch or mass production is carried out, it should be carried out every 5 years; e) when the national quality supervision agency conducts random re-inspection of product quality. Inspection type
Factory inspection
Type inspection
6.4 Each winch needs to undergo factory inspection, and the number of type inspections is 2 each time (1 for inspection and 1 for spare), and the samples for type inspection should be drawn from the products that have passed the inspection of the manufacturer. 6.5 When the winch meets the requirements of this standard, the product is deemed qualified. If the performance does not meet the requirements of 4.3, it should be re-inspected. If it still does not meet the requirements after re-inspection, the product is deemed unqualified. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Product marking
Each winch shall be fixed with a product label in the position specified in the drawing. The type, size and requirements of the product label shall comply with the provisions of GB/T13306 and shall be marked with the following contents:
a) manufacturer name and factory logo;
b) product name and model;
c) main technical parameters;
d) manufacturing number and date of manufacture.
7.1.2 Packaging Marks
The outer wall of the packaging box should have obvious text and symbol marks, the contents are as follows: a) Manufacturer name and address:
b) Product name and model;
c) Receiving unit and address;
d) Net weight, gross weight:
e) Box number, overall dimensions;
f) Factory date and number;
g) Box center of gravity line and lifting line,
MT/T 779-
—1998
h) "Handle with care", "Do not allow inversion" and other text symbols. 7.2 Packaging
7.2.1 The packaging of the winch should comply with the provisions of GB/T13384. 7.2.2 The following technical documents shall be provided with the winch: a) product certificate; b) product use and maintenance instructions; c) packing list, d) product assembly drawing. 7.3 Transportation and storage 7.3.1 The transportation of the winch shall comply with the regulations of railway, road, waterway transportation and mechanized loading and unloading. It shall not be subjected to severe vibration, impact or damage during transportation. 7.3.2 The winch shall be stored in a dry, ventilated, acid-free, alkali-free, rainproof and moisture-proof place.
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