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MT 644-1997 English PDF

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MT 644-1997: Pneumatic support
Status: Obsolete

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
MT 644-1997	English	439	Add to Cart	3 days [Need to translate]	Pneumatic support	Obsolete	MT 644-1997

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Basic data

Standard ID	MT 644-1997 (MT644-1997)
Description (Translated English)	Pneumatic support
Sector / Industry	Coal Industry Standard
Classification of Chinese Standard	D97
Classification of International Standard	73.100.99
Word Count Estimation	11,143
Date of Issue	11/10/1997
Date of Implementation	4/1/1998
Quoted Standard	GB/T 519-1993; GB/T 528-1992; GB/T 531-1992; GB/T 532-1989; GB/T 1689-1982; MT 113-1995; MT/T 154.1-1992
Summary	This standard specifies the air crib stent product classifications, technical requirements, test methods, inspection rules and packaging, storage and transport. This standard applies to coal mine h coal face support and other temporary support bracket stack gas.

MT64:

---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.
Pneumatic support People's Republic of China Coal Industry Standard MT/T 644-1997 Air stack support 1997-11-10 ratified 1998-04-01 Implementation Approved by the Ministry of Coal Industry of the People's Republic of China

1 Scope 1 2 Normative references 1 3 Definition 1 4 Product Category 1 5 Technical requirements 2 6 Test method 4 7 Inspection rules 6 8 Marking, packaging, transportation and storage 8

Foreword

The preparation of this standard refers to the "Technical Conditions for PS-type Multi-cavity Air Stack Brackets" in the Identification Materials of Air Stack Brackets and the Rubber Industry of the Ministry of Chemical Industry The relevant standards of the product are combined with the use of the air stack support in coal mines. This standard is proposed by the Department of Science and Education of the Ministry of Coal Industry. This standard was drafted by the Beijing Institute of Mining, China Coal Research Institute. This standard is under the jurisdiction of the Standardization Technical Committee for Special Equipment for Coal Mine of the Ministry of Coal Industry. The main drafter of this standard. Li Jiqing. This standard is entrusted to the Beijing Coal Research Institute of the China Coal Research Institute for interpretation. Air stack support

1 Scope

This standard specifies the product classification, technical requirements, test methods, inspection rules, packaging, storage, and transportation of air stack support. This standard applies to the support of coal mine underground coal mining face and other temporary support air stack support.

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 519-93 Test method for physical and mechanical properties of pneumatic tires GB/T 528-92 Determination of tensile properties of vulcanized rubber and thermal rubber GB/T 531-92 Shore A hardness test method for vulcanized rubber GB/T 532-89 Determination of the bonding strength between vulcanized rubber and fabric GB/T 1689-82 Determination of the abrasion resistance of vulcanized rubber MT 113-1995 General test method and judgment rules for flame retardant antistatic property of polymer products for underground coal mines MT/T 154.1-92 Guidelines for compiling models of coal mine electromechanical products and management methods

3 Definition

This standard uses the following definition. A cavity rubber capsule support device using compressed air as a working medium for a coal mining working face. 3.2 maximum working height The maximum support height allowed by the air stack support design. 3.3 minimum working height The minimum support height allowed by the air stack support design. 3.4 ratedoriginalinternalpressure Maximum air pressure value allowed when the air stack support is installed. 3.5 minimum initial support force At the maximum working height of the air stack support, when the internal air pressure is the rated initial internal pressure, it actively supports the roof.

4 Product Categories

4.1 Type 4.1.1 Air stack support can be divided into flange type and non-blue plate type according to its structure. 4.1.2 The air stack support can be divided into long air stack support and short air stack support according to its length. With a length of 1400mm or more (including 1400mm) For long air stack support, the following is short air stack support. 4.2 Modeling method The type of air stack support shall be compiled in accordance with MT/T 154.1. The composition and arrangement of the air stack support model are as follows. The type and feature code are expressed in Chinese Pinyin capital letters. Q represents the air stack support; F in the first feature code indicates the flange type air stack Bracket; no letter means blue-panel air stack bracket cannot be used. In the second feature code, D indicates short air stack support; no letter indicates long air stack support. The required parameter is represented by Arabic numerals. The modified serial number is indicated by parenthesized capital letters (A), (B), (C). Model example. Q1.0/220/0.5 type air stack support. indicates that the maximum working height is 1.0m; the minimum initial support force is 220kN; the rated initial internal pressure is 0.5MPa non-blue plate long air stack support. QFD1.0/180/0.5 type air stack support. indicates that the maximum working height is 1.0m; the minimum initial support force is 180kN; the rated initial internal pressure is 0.5MPa flange type short air stack support. 4.3 Main parameters of air stack support 4.3.1 The working height series of door air stack support is shown in Table 1. 4.3.2 The minimum initial supporting force of the air stack support is shown in Table 2. 4.3.3 The rated initial internal pressure of the air stack support shall be in the range of 0.1 ~ 0.5MPa.

5 Technical requirements

5.1 General technical requirements 5.1.1 The air stack support and its components shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 5.1.2 The various materials used in the air stack support shall comply with the relevant national standards and industry standards. 5.1.3 The same parts of the same type of air stack support shall be universal and interchangeable. 5.1.4 The surface of the shut-off valve should be treated with anti-corrosion, and the handle can be rotated flexibly. 5.1.5 Certificates of conformity must be obtained for outsourced parts and purchased parts, and parts can only be assembled after passing the experience. 5.2 Appearance quality 5.2.1 The surface of the rubber bladder should be smooth and complete, without affecting the scars, lack of glue and cracks required for use. 5.2.2 The wall of the rubber capsule must not be honeycombed. 5.2.3 The covering rubber of the rubber capsule wall shall not have more than 4cm2 emptying, and less than 4cm2 shall not exceed 3 emptying. The ply must not be emptied. 5.2.4 The surface of the handle should be smooth and complete, the cord should not be twisted or loose, and there should be no phenomenon of squeezing the cord. 5.3 Weight The weight of the air stack support shall not be greater than the value specified in Table 3. 5.4 Physical and mechanical properties of rubber capsule wall The physical and mechanical properties of the rubber bladder wall of the air stack bracket should meet the requirements in Table 4. 5.5 Inspection intensity The height of the rubber pouch of the air stack bracket exceeds the maximum working height of 0.15 ~ 0.20m, and the internal air pressure reaches the rated initial internal pressure of 1.65 ~ At 1.70 times, no obvious residual deformation should occur. 5.6 Ultimate failure strength The ultimate failure pressure of the rubber pouch of the air stack bracket should not be less than 4 times its rated initial internal pressure. 5.7 Water tightness At the maximum working height and the rated initial internal pressure, the air stack support should float without bubbles in the water. 5.8 Long-term sealing performance At the maximum working height, the air stack support is maintained at an internal pressure of 0.2MPa and 0.6MPa for 24 hours, and the internal pressure drop value should not be large. 5% of initial pressure. 5.9 Operating characteristics Compared with the designed working curve of height-supporting resistance of air-stack support, the maximum offset value should be within ± 1000. 5.10 Stable Performance When the angle between the top and bottom plates is 11 °, the air stack support should be able to support the top and bottom plates stably. 5.11 Breaking pull force The average breaking tension of the air-stack support handle should not be less than 10kN. 5.12 Life The air stack support shall meet the requirements in 5.5 and 5.7 after 2500 life tests according to 6.13. 5.13 puncture resistance After carrying out the puncture resistance test according to 6.14, the air stack support shall not leak air. 5.14 Antistatic performance The antistatic performance of the air stack support should meet the relevant requirements in MT 113. 5.15 Resistance to lateral thrust The long and short sides of the flange type air stack support are under the conditions of uniform lateral thrust of 50kN and 30kN, respectively. There should be no tearing at the joints and no damage to the bolt holes. 5.16 Charge and deflate time The filling and deflating time of the air stack support should be less than the value specified in Table 5.

6 Test method

6.1 Test conditions 6.1.1 The working medium used in the test has an oil content of less than 1 mg/m3 and a water content of not more than 5 mg/m3. 6.1.2 Each test shall be performed indoors (temperature difference is within 10 ℃), and the temperature of the working medium shall be controlled below 50 ℃. 6.1.3 The measurement accuracy level is C, and the pressure measurement range should be 140% ~.200% of the test pressure. 6.2 Test procedure The procedure for each test is as follows. Appearance inspection → weight → inspection strength → water-sealing performance → long-term sealing performance → working characteristics → stability → puncture resistance → resistance Lateral thrust performance → charging and degassing time → ultimate breaking strength → handle breaking tension → antistatic performance → physical and mechanical properties of rubber capsule wall can. The life test is checked with another sample. 6.3 Visual inspection The appearance of the air stack bracket is inspected by visual inspection and general measuring methods. 6.4 Weight The heavyweight of the air stack support is tested with a scale. 6.5 Physical and Mechanical Properties of Rubber Heads 6.5.1 The breaking strength, elongation at break and permanent deformation at break of the covering rubber shall be sampled according to the provisions in GB/T 519, and according to GB/T 528 Provision is made for testing. 6.5.2 The hardness of the covering rubber shall be measured in accordance with the provisions in GB/T 531. 6.5.3 The abrasion amount of the covering rubber is sampled in accordance with the provisions in GB/T 519 and tested in accordance with the provisions in GB/T 1689. 6.5.4 The adhesion between the components of the rubber capsule wall is sampled according to the regulations in GB/T 519 and tested in accordance with the regulations in GS/T 532. 6.6 Inspection intensity Place the air stack bracket into the test frame shown in Figure 1, and inflate the air stack bracket to a height that exceeds the maximum working height of 0.15 to 0.20 m, the internal air pressure reached 1.65 to 1.72 times the rated initial internal pressure. After holding the pressure for 15 minutes, observe whether there is significant residual deformation in the air stack support. 6.7 Ultimate failure strength Put the air stack support into the test bench shown in Figure 2, and fill the air stack support with liquid to make it reach the maximum working height. Up to Starting from 0.3 MPa, the internal pressure and support resistance were recorded once for every 0.1 MPa increase. Liquid-filled boost rate must not exceed 0.1MPa/min. After the internal pressure reaches 1.5 MPa, every 0.05 MPa rise, record the internal pressure and support resistance value until the air stack support Failure, record the value of the internal pressure at the moment of failure. 6.8 Water tightness Place the air stack bracket into the test frame shown in Figure 1, and inflate the air stack bracket to the maximum working height and rated initial internal pressure. Then, put the air stack support together with the test stand into the water tank, and submerge the air stack support with water. After the water surface is calm, observe whether bubbles appear. The observation time is 5min. 6.9 Long-term sealing performance Place the air stack support into the test stand shown in Figure 1, and inflate the air stack support to the maximum working height. When the pressure reaches 0.2MPa and 0.6MPa, close the shut-off valve. Record the internal pressure value after 2h and the internal pressure value after holding pressure for 24h. On record two For the second internal pressure value, the temperature difference between room temperature should not be greater than 3 ℃. 6.10 Operating characteristics Place the air stack bracket into the test bench shown in Figure 2 and inflate the air stack bracket to the maximum working height. Do not stop inflation when it reaches 0.3, 0.4, 0.5, 0.6 and 0.7 MPa. The platform on the test bench is slowly pressed down, and the gas is applied at a rate of 50 kN/min. The stacker is loaded until the height of the stacker is 0.35m. The above test was repeated three times for each initial internal pressure. Pressurized load The corresponding heights of the stacker and the stacker are automatically recorded by the load platform and the cable displacement sensor through a secondary instrument, respectively. Finally, based on test data Draw the working characteristic curve of the air stack support. 6.11 Stable Performance Place the air stack support in the test bench shown in Figure 2 and adjust the lower platform so that an angle of 11 ° is formed between the upper and lower platforms. Air stack support Inflate it so that its middle height is the maximum working height and the internal pressure is the rated initial internal pressure. Observe the support of the air stack support. 6.12 Breaking pull force Hang the air stack support vertically, hang the weight under a handle, and gradually increase the weight until the handle is broken. Detect 4 handles at a time, Calculate its arithmetic mean. 6.13 Life Place the air stack bracket into the test frame shown in Figure 1, and inflate the air stack bracket to the maximum working height and rated initial After holding for 30s, deflate to zero for one cycle. Repeat the above cycle 2500 times. 6.14 Puncture resistance Place the air stack bracket into the test frame shown in Figure 1, and place two sharp-angled metal modules along the longitudinal centerline at the bottom of the air stack bracket (see figure) 3), the position of the metal module is shown in Figure 4. Inflate the air stack bracket to the maximum working height and rated initial internal pressure.After holding for 5 minutes Deflate and observe whether the sharp corners of the module penetrate the rubber layer and see if there is any puncture. 6.15 Antistatic performance Check in accordance with the relevant regulations in MT 113. 6.16 Resistance to lateral thrust Put the air stack bracket into the test bench shown in Figure 2, and fix the flange of the air stack bracket and the lower plane with the designed bolts. In the most Under the conditions of large working height and rated initial internal pressure, a uniform thrust force perpendicular to the side is applied to the side of the rubber capsule cavity. First apply to the long side Add 50kN thrust; then apply 30kN thrust to the short side for 60min. Observe the connection between the rubber bladder and the flange Whether there is any tear or damage to the fixing bolt holes of the flange. 6.17 Charge and deflate time The air stack support is placed in the test stand shown in Figure 1 so that the distance between the upper and lower planes is the maximum working height of the air stack support. The stack stand is inflated until its internal pressure reaches the rated initial internal pressure. Use a stopwatch to record the inflation time used. Start to deflate after staying for 5min, Use a stopwatch to record the deflation time from the beginning of the deflation to the time when the air stack support comes off the upper plane. Repeat the test 3 times and calculate the arithmetic mean. The pressure of the air compressor used for testing shall not be lower than 0.7MPa, the flow rate shall not be lower than 3m3/min, and the capacity of the air tank shall not be lower than 1.0m3. The inner diameter of the ventilation pipe between the air compressor and the air stack bracket must not be less than 19mm.

7 Inspection rules

7.1 Inspection classification 7.1.1 The inspection of the air stack support is divided into type inspection and factory inspection. 7.1.2 Type inspection shall be carried out in any of the following cases a) New product stereotypes or old products are transferred to the factory for trial production; b) After the production of a formal product, changes in product design, structure, materials or processes may affect performance; c) when production is suspended for more than 6 months before production is resumed; d) when the national product quality supervision agency requests the type inspection; e) When the user has a major objection to the product quality and needs to conduct arbitration inspection; f) A type inspection is required every three years for the same product. 7.1.3 Products must be inspected before they leave the factory. The inspection is carried out by the quality inspection department. When the user accepts the products, they are inspected according to the factory inspection items. 7.2 Inspection items Carry out according to Table 6.

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