This standard specifies the type, size, technical requirements, test methods, inspection rules, marking and packaging of hydraulic nuts with thread specifications of M24-M48 and their matching high-strength studs, high-strength nuts and high-strength washers. This standard is applicable to high-strength bolt connections with anti-loosening requirements on large and medium-sized mining machinery and equipment. MT/T 913-2002 Dimension series and technical conditions of hydraulic nuts and high-strength fasteners for mining MT/T913-2002 Standard download decompression password: www.bzxz.net

ICS 73. 100. 99
Registration No.: 10323-·2002
People's Republic of China Coal Industry Standard
MT/T 913 --2002
Hydraulic nuts and high-strength fasteners for oal mining machinery
2002-04-C8 Issued
State Economic and Trade Commission
2002-09-01 Implementation
Mr/T 913—2002
This standard defines the size and technical specifications of the commonly used nuts and high-strength fasteners for oal mining machinery. The size determination mainly considers the actual situation of current use and the interchangeability of the products. This standard was proposed by the China Coal Industry Association. This standard is under the jurisdiction of the Coal Industry Coal Mine Special Equipment Standardization Technical Committee. This standard was drafted by: Shanghai Branch of China Coal Research Institute. The drafters of this standard are Wu Lixiong, Ma Jingruo and Zhang Di. This standard is interpreted by Shanghai Branch of China Coal Research Institute. 1 Scope
Coal Industry Standard of the People's Republic of China
Hydraulic nuts and high-strength fasteners for coal iningmachinery
MT/T 913-2D2
This standard specifies the type, size, technical requirements, test methods, inspection rules, markings and packaging of the hydraulic nuts with screw efficiency specifications of M2--M4 and their matching high-strength screw properties, commercial neck nuts, commercial double washers. This standard is applicable to the island-end bolt connection on the equipment of medium-sized mining machinery with no inspection requirements. 2 Reference standards
The following standards contain clauses that become the clauses of this standard through reference to the relevant standards. When this standard is published, all versions are valid. All standards will be updated in due course. The parties using this standard should discuss the possibility of using the latest versions of the following standards. GB/T2-1185 End pins of the outer ends of the fasteners GB/T196-1981
Basic dimensions of first-through screws (diameter 1--600mm) GR/T 9-15S
Tolerances and fits of ordinary screws (point chain 1355m0) GB/T 699-1S9S
High-quality magnetic structural copper
GB112311SS! High-strength large hexagonal bolts and large hexagonal nuts for steel structures, technical conditions for batch inspection and sampling table (for inspection of connected batches) GB/T3538-1987 GR/T 3077-194S Joint enterprise structural steel GB/T H098,2—2000 Mechanical properties of nut torsion and thread cracking GB/T3098.4-2000 Required to be four pieces Nut fine groove 3 Types and sizes 3.1 Types and sizes of hydraulic nuts The types of installation with press nuts can be divided into quality type, top ring type and bottom ring type. For the types and installation of hydraulic nuts, see 2. See 1 for dimensions. The type and size of the ring type hydraulic pressure mother are shown in Figure 2 and the table. National Economic and Weak Committee approved on April 8, 2002 and implemented on September 1, 2002
MT/T 913-2002
1-output frequency mother; 2-core connection sample: 3-high frequency search: 4-high group skin diagram: 5-high strength certificate explosion mother; 5-mother diagram 1 bottom ring type night frequency mother
installation 1 ring type pressure pregnant mother size series
bee specification 1
explosion distance force
height H
ratio: fine tooth frequency is the first choice sample series. Rent tooth Na pattern is the second choice of British column Mss
change pressure explosion mother technology company length body high strength official 1-area diagram 15-high annual account mother interruption will be the ring type pressure End plate
2 Yi ring type drop nut gauge series
Frequency pattern
Screw gauge replacement
Dirty oil port deep pressure
MT/T9T3-2002
Continued table 2
In: fine pitch period is uniform selection series ancestral pitch is the first uniform call series 3.2 Type and size of the spring screw bar
High sub-screw pull can be divided into three types: A, B, and C according to the type of the head. The type of A stud is shown in Figure 3. The size is shown in Table 3. The type of C is shown in Figure 1. The size is shown in Table 4. The type of C is shown in Figure 5. The size is shown in Table 5. The type of A stud is shown in Figure 5. The size is shown in Table 3. The type of A stud is shown in Figure 3. The size is shown in Table 4.
13-032
For single use to make the stomach press properly, the maximum length of the push and push stroke can be determined by the actual length, and its general reference is 2T14:bzxZ.net
d. Original effective middle diameter:
3 Unmade hexagonal screw age does not meet the requirements of G door 2:451
Coal relatively standard
Solution distance
MT/T 913 20D2
Table 4 type screw size series
For single use pressed nut, the maximum length of the nut can be determined by the general reference, and its general reference is rri4:
2 t, take the relatively large middle diameter
Unmade hexagonal one-stage mourning effect of the end of combustion technology GR/T2 standard 2 ×45'
frequency specification.
= ×45
Table 5C type stud size for series
body single end extension effective size marriage thickness design, the maximum position allowed within the medical butterfly type range should be determined according to the actual standard length of the male stem according to 1174.
2, the original collection in the original collection in the original collection end according to the GB/2 standard 3.3 high strength frequency support size
high strength nut size see Figure 5, Table 6,
screw mosquito size D
3.4 ​​high strength factor when the size
high strength pad two see Figure 7 table.
Screw effect specification L
MT/T913—202
15 30*1.30
90-193
High strength mother
Table 6 Separation frequency per foot square series
ins- 3Y
Figure? High energy fast medical
Commercial strength size series
4 Technical requirements
4.1 Performance level, material separation match
MTT 913--2G02
4.1.1 Recommended performance data of pressure screw plate, high strength screw, high frequency and high strength pad are shown in Table 8. Table 8 Performance data and recommended materials
Quick shot data
3BHKC--.2HRC
Material related
4CA,rNiMa
AKTNiMnA,SECrMA
Pressure nut, high strength stud, commercial strength nut are used in conjunction with Table 9, Table S is used for combination
High strength nut
4.2 Liquid nut, high strength stud, high frequency and high strength nut screw filling degree nut
Standard number
CB/T 3C17—1999
CB/T30/7—1999
G/T 3U77—1929
GB/T 699—1999
High-strength threaded nuts
X8HRC42HRC
4.2.1 The basic dimensions of the thread shall comply with the corresponding screw thread specifications in GB/T196, and the thread tolerance of the nut shall comply with the 6H of GB1971591. The thread tolerance of the nut shall comply with 6H of G/T197.
4.2.2 The effective thread size of the nut and high-strength nut shall be R6.34.3 The hardness of the hydraulic nut and high-humidity nut shall comply with the hardness of the hydraulic nut and high-strength nut in Table 10. Table 10 Pre-compression nut, high strength nut performance grade 4.4 Mechanical properties of high strength nut Grignard degree 35H3C-4D HRc: 38HRT: ~42HR: 1. Some mechanical properties of high strength nut are shown in Table 11, and the rest are in accordance with GB/T300R.2, GB/T50S8.4, 4.4. 1
Cylinder load
Frequency effect
Screw range mm
Preset force KN
Hydraulic screw thread
Guarantee our business/N
High strength or screw government
Guarantee full N
4.4.2 The mechanical properties of high-strength end products shall comply with the provisions of GB/T1231. 4.4.3 The mechanical properties of high-strength cushions shall comply with the provisions of GB/T1231. 4.5 Pressure performance of nut
The bearing capacity of the pressure nut shall be guaranteed to produce a large pre-exposure force.856
4.6 Surface treatment
MT/T 913—2002
The surface of the nut shall be treated with anti-corrosion treatment. The process formula of the treatment shall be selected by the manufacturer. High strength nut, high strength nut and high strength pad shall comply with the provisions of 51231. 5 Test methods
5.1 Test method of sieve nut
5.1-1 Test method for the hardness of hydraulic nut
The hardness of the filter is tested by a hardness tester.
5. 1.2 The thread roughness of the hydraulic nut is tested by a thread efficiency gauge on the inside and outside of the pressure nut. 5.1.3 Test method for the roughness of the thread of the hydraulic nut The thread roughness of the hydraulic nut is tested by a torsion box comparison gauge. 5.[.4 Hydraulic performance test method of drop pressure nut Install the pressure nut and high-strength deep-threaded nut and high-strength nut according to the method in Figure 1 (the connected pressure body in Figure 1 can be replaced by a late change), increase the pressure to the maximum preload in the table (generally 1.1 times the working pressure), maintain the pressure for 30 seconds and then expand the nut. After the pressure is removed, observe that the connecting thread should not be loosened or cracked. Then increase the pressure to slightly higher than the maximum preload, and the nut can be loosened by hand or with the help of a wrench (the rate of tightening should not exceed 1/4). If the connection is damaged frequently, the test should be repeated. 5.2 Test method of commercial certificate
The test method of high-strength nut shall be in accordance with the provisions of GB/T1231. The test method of high-strength nut shall be in accordance with the provisions of GB/T1231. 6 Inspection rules
6. Inspection rules for high-pressure and high-stress hardware 61.1 Inspection rules for the neck hardness, thread characteristics, and thread roughness of the pressure-reducing end When the pressure nut is in the factory, its hardness, thread effect accuracy, and thread effect roughness must be inspected. The test sequence is as follows: 5.1.1, 5.1.2, 5.1, 3. Take the first-selected solution from the GB/T282 standard, the inspection rate level is D3, the qualified quality level is A1,=2.6, the inspection technology requirements are as follows 4.2.1.4.2-2 and 4.2.3, the qualified maintenance is as follows/2820-1087 standard 4.11:6.2 The concentrated pressure performance test number of the filter nut is
. The hydraulic nut should be combined with the commercial system, high-pressure screw and high-pressure circle before leaving the factory, and then carried out the bearing test according to 5.1.4. The test pressure is 1.1 times of the working pressure, and the test should be carried out at least twice. After the test, the pressure nut should not have any talking or tide pooling phenomenon.
6.1.3 High-strength explosion-proof nut, high-strength air-explosion nut, high-strength gasket The high-strength frame hanging high-strength gasket shall be tested in accordance with the relevant provisions of the manufacturer and GB/T1231. 62 Type test rules for hydraulic nut production
6.2.1 Type test scope
Manufacturers who produce new hydraulic nuts and new hydraulic nuts must carry out type tests. 6.2.2 The leakage performance of hydraulic nuts shall be tested during the test period. Among the products that have passed the test, the sampling method shall be based on the sampling plan of the H2828 standard, the inspection level shall be based on the special inspection level DL=S3. The qualified quality level is 1QL=4. The test method shall be based on 3:1.4. The quality judgment shall be based on 4.11 of the B/T2828-1987 standard.
Marking, packaging
.1 Marking
7.1 Marking of each pressure end
MT/T 913—2002
The pressure beam plate product shall be marked with the M1× mark and the working pressure IMa. For example, the smoke effect specification is 30mm, the pitch is 2mm, and the working pressure is 2J0MPl. The mark of the micro-pressure nut should be M30X221MPu. The pressure screw ear and the commercial stud, commercial pressure seat, and commercial pressure seat shall be packed according to (1231. When supplying hydraulic blasting, the product description shall be attached.
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