This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of the impeller flotation machine. This standard applies to the impeller flotation machine (hereinafter referred to as the flotation machine), which is mainly used for the flotation of coal slime (powder). MT/T 650-1997 Technical conditions for impeller flotation machine for coal MT/T650-1997 Standard download decompression password: www.bzxz.net

MT/T650-1997
This standard is proposed by the Department of Science, Technology and Education of the Ministry of Coal Industry. Introduction
This standard is under the jurisdiction of the Technical Committee for Standardization of Coal Mine Special Equipment of the Ministry of Coal Industry. This standard was drafted by the Tangshan Branch of the China Coal Research Institute. The main drafters of this standard are Zhang Liwei and Liu Honggong. This standard is entrusted to the Tangshan Branch of the China Coal Research Institute for interpretation. 347
1 Scope
Coal Industry Standard of the People's Republic of China
Technical conditions of coal flotation cells with oblique impellerMT/T 650—1997
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of oblique impeller flotation cells. This standard applies to oblique impeller flotation cells (hereinafter referred to as flotation cells), which are mainly used for the flotation of coal slime (powder). 2 Referenced standards
The clauses contained in the following standards constitute the clauses 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/T1348--88 Ductile iron castings
General tolerances Unspecified tolerances for linear dimensions
GB/T 1804-92
GB/T9439-88 Grey iron castings
GB/T13306-91 Signs
MT/T652-1997 Test methods and judgment rules for clear water performance of coal flotation machines 3 Technical requirements
3.1 Basic requirements
3.1.1 The flotation machine shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved through the prescribed procedures. 3.1.2 Purchased parts and cooperative parts should have a certificate of conformity and can only be assembled after being inspected and qualified by the technical inspection department of the manufacturer. 3.1.3 The unmarked dimensional tolerance of machined parts should comply with the provisions of m-level in GB/T1804. 3.2 Installation of the whole machine
3.2.1 After all the tanks of the flotation machine are assembled, the foam overflow weir should be on the same horizontal plane, and its deviation should not exceed 6mm. For DC flotation machines, the overflow weir height is required to be adjustable, and its adjustment range is 0~100mm. 3.2.2 The center line of the scraper shaft should be on a straight line, and the coaxiality deviation of the two adjacent shafts should not be greater than 0.2/1000. The scraper rotates flexibly without blocking. The scraper foam scraping edge is 3~6mm away from the edge of the overflow weir. For DC flotation machines, the scraper rotation diameter is required to be adjustable, and its adjustment range is 400~600 mm.
3.3 Installation of the stirring mechanism
3.3.1 The axial and radial clearances between the stator and the impeller are 10±1mm. 3.3.2 The distance deviation between the center of the impeller and the side walls of the tank body should not be greater than ±10mm. 3.3.3 The verticality deviation between the center line of the stirring shaft and the ground plane (or the bottom plane of the tank) should not be greater than 1/1000. 3.3.4 The stirring shaft should be able to rotate flexibly after assembly. 3.4 Tank body
3.4.1 The weld should not leak water.
Approved by the Ministry of Coal Industry of the People's Republic of China on November 10, 1997 318
Implemented on April 1, 1998
MT/T650---1997
3.4.2 The flatness deviation of each joint surface after welding should not be greater than 2mm per meter. 3.4.3 The verticality deviation of the end joint surface to the bottom surface shall not exceed 2mm per meter. 3.4.4 The straightness deviation of the overflow weir shall not exceed 3mm per meter of slot length. 3.4.5 The difference in the length of the two diagonals after welding shall not exceed 3/1000 of the diagonal length. 3.4.6 The height deviation of the overflow weirs on both sides to the ground plane shall not exceed 3mm. 3.4.7 The ratio of the parallelism deviation of the overflow weirs on both sides to the length of the overflow weir shall not exceed 3/1000. 3.5 Impeller
3.5.1 The material is ductile iron QT500-7, and its performance shall comply with the provisions of GB/T1348. 3.5.2 The service life shall not be less than 5000h.
3.5.3 The angle deviation between the inclined disc and the horizontal plane shall not exceed ±0.5°. 3.5.4 The taper of the 129H6 diameter taper hole is 1:20, and it is required to be interchangeable with the 129h5 diameter taper hole of the hollow shaft. The length of the grinding contact surface shall not be less than 70%.
3.5.5 After the impeller is manufactured, a static balance test shall be performed, and its static unbalanced moment shall meet the requirements of Table 1. Table 1 Static unbalanced moment of the impeller
Impeller diameter, mm
Static unbalanced moment, N·m
3.6 Stator
3.6.1 The material is ductile iron QT500-7, and its performance shall meet the requirements of GB/T1348. 3.6.2 The service life shall not be less than 7500h.
3.7 Hollow shaft
3.7.1 The material is 45# seamless steel pipe, and the performance of the substitute material shall not be lower than that of 45# steel. 760
3.7.2 The taper of the cone hole with a diameter of 129h5 at the fitting of the impeller is 1:20, and it is required to be interchangeable with the cone hole of the impeller, and the length of the grinding contact surface shall not be less than 70%.
3.8 The bearing seat
The material is ductile iron QT500-7, and its performance shall comply with the provisions of GB/T1348. 3.9 Large V-belt pulley
3.9.1 The material is HT150, and its performance shall comply with the provisions of GB/T9439. 3.9.2 After processing, a static balance test is required, and its static unbalanced torque shall comply with the requirements of Table 2. Table 2 Static unbalanced torque of pulley
(Single) Tank volume, m2
Static unbalanced torque, N·m
3.10 Appearance quality
The painted surface has no defects such as cracks, peeling, bubbles and flow marks. 3.11 Service life of the whole machine
The service life of the whole machine shall not be less than 45000h.
3.12 Clean water test performance of the whole machinewwW.bzxz.Net
The clean water test performance shall meet the requirements of 1~~~4 and 6~~~~10 in Table 1 of MT/T652. 4 Test method
4.1 Use a level to measure the horizontal plane deviation of the two overflow weirs of the flotation machine tank body after assembly, and use the wire drawing method to measure the straightness of the two overflow weirs of the tank body.
4.2 Use conventional measuring tools to measure the geometric dimensions of the tank body and the gap of the stirring mechanism. 349
MT/T650—1997
4.3 Use a wire drawing line as a horizontal line, rotate the scraper shaft, and measure the coaxiality of the center lines of the corresponding two scraper shafts. Hang a plumb line and rotate the stirring shaft to measure the verticality of the center line of the stirring shaft.
4.4 Use conventional test methods to inspect the material.
4.5 The test method for the clean water performance of the whole machine shall be carried out in accordance with the relevant provisions of MT/T652. 5 Inspection rules
5.1 Factory inspection
5.1.1 The product shall be inspected by the quality inspection department of the manufacturer. It shall be allowed to leave the factory after passing the inspection and issuing a certificate of conformity. 5.1.2 The items for factory inspection of products are shown in Table 3. Table 3 Inspection items
Clause where the inspection items are located
3.2 (two items)
3.3 (four items)
3.4 ​​(seven items)
3.6 (two items)
Factory inspection
Model inspection
Note: "" indicates inspection items; "-" indicates no inspection items. Clauses where inspection items are located
3.12 (nine items)
Factory inspection
Type inspection
5.1.3 Factory inspection is qualified if the number of unqualified items is no more than 2. It can also be determined according to the contract between the manufacturer and the user. 5.2 Type inspection
5.2.1 Type inspection should be carried out in the following situations: trial production and identification of new products and old products transferred to the factory for production; after formal production, if there are major changes in structure, materials, and processes that may affect product performance; during normal production, at least 1 unit should be selected from the qualified products of factory inspection for every 10 units produced; when the product is resumed after 2 years of suspension,
when the inspection results are significantly different from the last type inspection; when the national quality supervision agency proposes the requirement for type inspection. 5.2.2 Type inspection items are shown in Table 3.
5.2.3 Type inspection requires the following items (the first five of which are shown in MT/T652) to be qualified: Maximum flow rate of clean water;
Unit aeration volume;
Aeration uniformity coefficient:
Electric motor power consumption:
Axial and radial clearance of stirring mechanism.
At the same time, the number of unqualified items in other items should not exceed 2, otherwise it will be considered unqualified. 350
6 Marking, packaging, transportation, storage
MT/T650—1997
6.1 The sign should be fixed in a conspicuous position and should comply with the provisions of GB/T13306. The sign should include the following content: product model and name;
manufacturer name;
factory number and manufacturing date;
main technical parameters.
6.2 Random documents should be packed in plastic bags and fixed in the packaging box, including: 1. Product certificate;
packing list,
installation and operation instructions;
1. Drawing of vulnerable parts (impeller, stator).
6.3 The packaging and delivery of products should comply with the requirements for land and water transportation. 6.4 The exposed processing surfaces and internal processing surfaces should be coated with anti-rust oil and wrapped with oil paper or plastic cloth, and the exposed pipe joints and motors should be wrapped with plastic cloth.
6.5 Electrical equipment and small parts should be packed in packaging boxes, which should be firm and have rain and moisture-proof measures. 6.6 There are obvious text marks on the outer wall of the packaging box and the bare tank, including: - Receiving unit and address;
Product model and name,
- Manufacturer name and address, factory number and manufacturing date, - Net weight, gross weight, box number, overall dimensions and lifting mark. 351
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