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MT 195-1989: Mine U type steel yieldable support manufacturing technology condition
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| MT 195-1989 | English | 199 |
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Mine U type steel yieldable support manufacturing technology condition
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MT 195-1989
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Basic data | Standard ID | MT 195-1989 (MT195-1989) | | Description (Translated English) | Mine U type steel yieldable support manufacturing technology condition | | Sector / Industry | Coal Industry Standard | | Classification of Chinese Standard | D97 | | Word Count Estimation | 5,534 | | Date of Issue | 3/31/1989 | | Date of Implementation | 4/1/1989 | | Quoted Standard | GB 2101; GB 3414; GB 4697; MT 143; YB (T)46; YB 2006 | | Summary | This standard specifies the U-shaped steel retractable bracket (hereinafter referred to as "Stand") manufacturing technology requirements, test methods, inspection rules. This standard applies to the arch, horseshoe-shaped, round, square ring, ring, etc. long U-shaped steel retractable bracket. | MT19: ---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.
Mine U type steel yieldable support manufacturing technology condition
Ministry of Energy Standards
MT/T 195-89
U-shaped steel retractable bracket for coal mine
Manufacturing technical conditions
1989-03-31 ratified
1989-04-01 implementation
Approved by the Ministry of Energy of the People's Republic of China
Contents
1 Topic content and scope of application 1
2 Normative references 1
3 Technical requirements 1
4 Inspection method 2
5 Inspection Rule 2
U-shaped steel retractable bracket for coal mine
Manufacturing technical conditions
1 Topic content and scope
This standard specifies the manufacturing technical requirements, test methods, and inspection rules for U-shaped steel retractable supports (hereinafter referred to as "supports").
This standard applies to U-shaped steel retractable brackets such as arch, horseshoe, round, square ring, and long ring.
2 Reference standards
General requirements for GB 2101 section steel acceptance, packaging, marking and quality certificate
GB 3414 technical conditions for mining steel
GB 4697 Size, shape, weight and allowable deviation of hot-rolled U-shaped steel for mine roadway support
MT 143 Laneway metal bracket series
YB (T) 46 hot-rolled 25U steel for mine roadway support
YB2006 Hot Rolled Mining Steel
3 Technical requirements
3.1 The newly designed support shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures.
3.2 The chemical composition and mechanical properties of section steel shall comply with GB 3414.
3.3 Dimensions, shapes, weights and allowable deviations of section steel shall be implemented in accordance with the relevant regulations in GB 4697, YB (T) 46, MT 143.
3.4 Cutting requirements.
3.4.1 After blanking, the end surface shall be perpendicular to the longitudinal centerline, and the vertical deviation of the end surface shall not be greater than 2mm.
3.4.2 After the section steel is unloaded, the defects caused by the unloading, such as flash, oxides, dissolved slag, etc. should be removed.
3.4.3 After cutting and cutting the section steel, tearing is not allowed at the cutting edge. If tearing occurs, repair welding and smoothing are required.
3.4.4 The allowable deviation of the length of the section steel after being unloaded is ± 5mm.
3.5 Suppression requirements.
3.5.1 After the beam and legs are pressed and formed, the arc segment should be smooth, and the intersection of the straight segment of the leg and the arc segment should be tangentially transitioned to avoid the existence of hard transitions.
3.5.2 After the beam is pressed and formed, when the beam and the two ends of the template match, the error between the top of the beam and the template shall not be greater than 6mm;
During the anastomosis, the error between the two ends and the template shall not be greater than 4mm.
3.5.3 After the leg is pressed and formed, when the straight leg section coincides with the template, the error between the arc end and the template shall not be greater than 5mm.
3.5.4 After the beam is press-formed, no transverse cracks are allowed at both ends of the beam. The length of the longitudinal crack shall not be greater than 80mm, and the crack shall be repaired and smoothed.
3.5.5 After the leg is pressed and formed, the arc end of the leg is not allowed to have transverse cracks. The length of the longitudinal crack shall not be greater than 80mm, and the crack shall be repaired and smoothed.
3.5.6 After the beam and leg are formed, the length of the straight end of the two ends of the beam and the arc end of the leg shall not be greater than 120mm for the 18, 25U steel bracket,
29, 36U steel brackets should not be larger than 80mm.
3.5.7 After forming the legs of the 18 and 25U steel brackets, the maximum twist of the total length shall not be greater than 3mm.
3.5.8 After forming the legs of 29 and 36U steel brackets, the maximum total length of the beam shall not be greater than 5mm.
3.5.9 After the beams and legs are formed, the opening of the section steel slot shall not be greater than 4mm.
3.6 Card cable requirements.
3.6.1 The cables should be processed in accordance with the requirements of the design drawings.
3.6.2 All parts of the card cable must have good interchangeability, and the bolts can be directly inserted between the two card cable boards in the installed state.
3.6.3 Parts requiring quenching and tempering must meet the hardness index.
3.7 Welding requirements.
3.7.1 The welding of the bottom plate and the column leg shall be kept vertical, and the deviation of its perpendicularity shall not be greater than 2mm.
3.7.2 The legs can be welded with short materials.The position of the weld seam should be below the arc segment of the leg, and the straight part greater than 100mm.
In the tensile strength test, its strength shall not be lower than that of the raw materials.
3.8 Assembly requirements.
3.8.1 After the bracket is assembled, the total height and width should meet the design requirements.The total height error is ± 1% of the bracket size, and the total width error
It is ± 2% of the bracket size.
3.8.2 After the bracket is assembled, the overlap length of the joint should meet the design requirements, and the error of the overlap length is ± 5%.
3.8.3 After the bracket is assembled, the flatness of the whole frame must not be greater than 20mm.
4 Inspection method
4.1 The steel tolerance, steel tape measure or caliper shall be used for inspection of dimensional tolerance.
4.2 Beam and leg arc segments are checked with a prototype. The tolerance between the prototype and the design dimension shall not be greater than 0.5mm.
4.3 After the bracket is assembled, place it on a flat plate (or flat ground), and measure the flatness of both sides with a steel ruler.
4.4 The angle between the column leg and the base is checked with a square or a template.
4.5 The hardness index shall be checked with a hardness tester.
4.6 Check for cracks by visual inspection.
5 Inspection rules
5.1 During normal production of the stent, the items listed in the table below should be inspected regularly.
5.2 Parts that fail to pass the inspection shall be treated as qualified.
5.3 The finished product inspection shall be carried out by random sampling. One batch shall be sampled under 100 frames, two 101-500 frames and two over 501 frames
Check three. It is judged that the stent is qualified and unqualified. If there are unqualified persons, the sampling is doubled. After the repeated sampling, there are still unqualified persons, the batch of stent is determined to be unqualified.
Additional information.
This standard was proposed by the Technology Development Department and the Material Supply Bureau of the China Unified Coal Mine Corporation.
This standard was drafted by the Beijing Institute of Mining, China Coal Research Institute.
The drafters of this standard are Liu Chongyue and Yao Shejun.
This standard is entrusted to the Beijing Coal Research Institute of the China Coal Research Institute for interpretation.
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