This standard specifies the definition, type and parameters, requirements, test methods, inspection rules, marking, packaging, transportation and storage of the loading mechanism of a cantilevered roadheader (hereinafter referred to as roadheader). This standard applies to the loading mechanism of roadheaders used underground in coal mines, as well as the loading mechanism of continuous coal miners and coal loaders. MT/T 922-2002 General Technical Requirements for Loading Mechanisms of Cantilevered Roadheaders MT/T922-2002 Standard download decompression password: www.bzxz.net

ICS 73.100.10
Registration number: 10517--2002
Coal Industry Standard of the People's Republic of China
MT/T922-2002
Boom-type roadheader
General technical conditions of loading mechanism
Boom-type roadheader---General technical conditions of loading mechanism2002-06~19 Issued
State Economic and Trade Commission
2002-09-01 Implementation
MT/T922-2002
This standard is compiled based on MT238-1991 "General Technical Conditions for Boom-type Roadheaders" and MT291.1-1998 "Inspection Specifications for Transmission Gearboxes of Boom-type Roadheaders". This standard is 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 the Taiyuan Branch of the China Coal Research Institute. The main drafter of this standard is Liu Jianping.
This standard is interpreted by the Tunneling Machinery Branch of the Technical Committee for Standardization of Coal Mine Special Equipment. Standards granted by the wm.com.cn Standard Industry Information Free Comparison 1 Scope
Coal Industry Standards of the People's Republic of China
Boom-type roadheader
General technical conditions of loading mechanism
Boom-type roadheader-General technical conditions of loading mechanism MT/T 922-2002
This standard specifies the definition, type and parameters, requirements, test methods, inspection rules, and marking, packaging, transportation, and storage of the loading mechanism of the boom-type roadheader (hereinafter referred to as the roadheader). This standard applies to the loading mechanism of the roadheader used underground in coal mines, and also to the loading mechanism of continuous coal mining machines and coal loaders. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following subtitles. GB/T3077—1999 Alloy structural steel (negDINEN10083-1:1991) GB11365--1989 Bevel gear accuracy
MT238—1991 General technical conditions for cantilevered tunnel boring machines MT291.1—1998 Inspection specification for transmission gearboxes of cantilevered tunnel boring machines 3 Definitions
This standard adopts the following definitions.
3.1 Loading mechanism loading mechanism The mechanism that collects and loads the materials cut by the tunnel boring machine onto the conveyor. 3.2 Rampplate
The structural component of the tunnel boring machine that collects, scoops and carries materials. It can be divided into the main shovel plate and the auxiliary shovel plate in terms of structure. It also has the functions of bottom cleaning and support.
3.3 Sprocket assembly sprocket assembly The component that relies on the transmission device to support and transmit power to the conveyor. Note: Depending on the different structural forms, it may not be classified as a loading mechanism. 3.4 Gathering-arms
The cut materials are loaded onto the gathering device on the conveyor through a four-bar linkage. 3.5 Spinner discs
The cut materials are loaded onto the gathering device on the conveyor using a rotating star wheel. 3.6 Centre distance of transmission wheel The distance from the left and right rotation centre of the gathering device. Approved by the State Economic and Trade Commission on June 19, 2002, and implemented on September 1, 2002. Types and parameters 4.1 Basic structure MT/T 922—2002 4.1.1 The loading mechanism is generally composed of a drive device, a transmission device, a main shovel, an auxiliary shovel, left and right rake claws (star wheels), a sprocket assembly, etc. (see Figure 1).
1-left and right rake claws; 2-driving device; 3-transmission device; 4-sprocket assembly; 5-star wheel; 6-main shovel board; 7-auxiliary shovel board Figure 1 Basic structure of loading mechanism
4.1.2 The basic structural types of loading mechanism are: according to the driving mode: electric motor drive and hydraulic motor drive; according to the layout of the driving system: single drive and centralized drive (linkage); according to the mechanism form of loading materials: rake melon mechanism, star wheel mechanism and scraper chain mechanism, etc.; according to the shovel board form: basic type and widened type. 4.2 Basic parameters
4.2.1 When the loading mechanism is driven by an electric motor, the power capacity of the motor shall comply with the provisions of Table 1. Table 1
The explosion-proof type of the electric motor is flameproof type.
When the loading mechanism is driven by a hydraulic motor, the rated working pressure of the hydraulic motor circuit shall comply with the provisions of Table 2. 4.2.2
Note: The values ​​in brackets are not recommended.
5 Requirements
5.1 Design requirements
5.1.1 Technical production capacity of loading mechanism:
When the claw mechanism is used, it is calculated according to the following formula
Where: Q Technical production capacity, t/h;
Eccentric disk speed, r/min;
Q = 60nBdhYk,kzks
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MT/T922-2002
B—Loading surface width, maximum distance between the two harrow claws, m; d—Average length of the harrow claws, that is, the longitudinal length of the harrowed and deposited materials, m, h—Average height of the harrow claws, m;
—Material accumulation density, t/m\;
kl—Loading area coefficient, recommended to be 0.8; k2—Loading coefficient, recommended to be 0.75;
k3 Working time coefficient, recommended to be 0.6.
5.1.2 In the claw mechanism, the ratio of the center distance of the driving wheel to the eccentricity is recommended to be 4.85.0. 5.1.3 In the claw mechanism, the eccentricity shall not be less than 0.35~0.4 times the maximum block size of the material allowed to be loaded. 5.1.4 The speed of the eccentric disk is generally controlled at 27~~45r/min. 5.1.5 When the claw mechanism is used, the left and right transmission devices must be linked, and the phase difference of the claws should be 180°, and the star wheel mechanism must also have a certain phase difference.
5.1.6 The clearance between the aggregate device and the upper plane of the shovel plate is recommended to be 2~5.5mm5.1.7 The shovel plate structure should have sufficient strength to meet the requirements of shovel plate support, lifting the tunnel boring machine and bottom cleaning. 5.1.8 The width of the basic shovel plate should be greater than the outer width of the crawler, and it is recommended to be greater than 0.15m; the width of the widened type should be smaller than the maximum clear width of the tunneling tunnel.
5.1.9 The chemical composition and mechanical properties of the materials of the actuator parts and sprocket assembly sprocket wheel body shall comply with the provisions of GB3077. 5.1.10
) The floating seal device is recommended for sealing. 5.1.11 The strength of the main weld of the welded shovel plate shall be greater than the strength of the parent material. 5.1.12 The accuracy grade of the bevel gear of the gearbox is recommended to be no less than 8-8-7 in GB11365-1989. 5.1.13 The transmission mechanical strength safety factor of the gearbox shall be no less than 2.5. The design life shall not be less than 5000h. 5.1.14 Reliable anti-loosening measures shall be taken for components and important connecting bolts that are subject to dynamic loads, large loads and strong vibrations. 5.2 Performance in use
5.2.1 The loading mechanism shall enable the tunnel boring machine to transfer materials to the conveyor in a timely manner. 5.2.2 The loading mechanism shall have protective devices and a certain impact resistance. 5.2.3 The loading mechanism should ensure flexible operation and convenient maintenance. It should be easy to disassemble and assemble during installation; it should be flexible to lift and lower after installation, and should not hinder the normal operation of the conveyor. The loading mechanism and shovel must have a certain wear resistance. 5.2.4 During operation, no oil leakage is allowed at the end covers, output shafts, box joint surfaces, etc. of the gearbox and other transmission devices. 5.2.5 The seal of the gearbox must have high reliability and service life in coal slurry. 5.2.6 Each gearbox, bearing, etc. must be filled with the specified brand of grease and oil in a timely manner according to the design requirements, and generally shall not be mixed for use. 5.2.7 When the loading mechanism is operating, the maximum oil temperature in the gearbox shall not exceed 95°C. 5.3 Dimensions and Quality
5.3.1 Dimensions shall be measured according to the following contents and requirements: a) The center distance of the actuator drive wheel shall meet the size and deviation requirements specified in the construction drawing; b) The outer width of the shovel plate Ln ± 10 mm;
c) The distance between the transmission center and the shovel tip Lz ± 5 mm. 5.3.2 The error of quality shall not exceed 5%.
5.4 Test requirements
The loading mechanism of the tunnel boring machine shall be subjected to the following tests with the whole machine: gap adjustment size, assembly quality, inspection before no-load test, no-load test, sealing performance test, no-load noise measurement, loading capacity measurement, transmission gearbox type test and shall comply with the relevant provisions of MT238 and MT291.1.
Standards and regulations 6 Test methods and inspection rules
6.1 Measurement accuracy
MT/T 922—2002
The accuracy of the measuring tool shall match the accuracy of the measured parameters. 6.1.1 Test content
Except for the measurement of external dimensions and quality, the remaining tests shall be carried out in accordance with the relevant provisions of MT238 and MT291.1. 6.2 Inspection rules
6.2.1 Inspection classification
The inspection items of the loading mechanism of the tunnel boring machine are divided into factory inspection and type inspection. 6.2.2 Factory inspection
Each tunnel boring machine loading mechanism leaving the factory must undergo factory inspection. 6.2.2.1 Inspection items:
The inspection items shall comply with the provisions of Table 3.
Inspection items
Overall dimensions
Gap adjustment dimensions
Assembly quality
Inspection before empty cutting test
No-load test
Sealing performance test
No-load noise measurementbzxZ.net
Loading capacity measurement
Type test of transmission gearbox
“√\ indicates the test that should be carried out,” “一\” indicates that no test is carried out; 2Except for serial numbers 1 and 3, the rest of the items are tested with the complete tunnel boring machine; 3The clearance adjustment dimension of serial number 2 is The gap between the lower plane of the target claw arm and the surface of the shovel plate 6.2.3 Type inspection
Type inspection should be carried out in any of the following situations: a) When a new prototype or an old product is transferred to a factory for production and needs to be finalized; Type inspection
Inspection classification
Factory inspection
b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c) When the user has major objections to product quality; d) When the product is resumed after being discontinued for 2 years; e) When the national quality supervision agency makes a request. 6.2.3.1 Inspection items:
The inspection items should comply with the provisions of Table 3.
6.2.4 Determination of inspection results
MT/T 922—2002
6.2.4.1 Inspection can be carried out according to the construction drawings and the requirements of this standard. 6.2.4.2 The factory inspection is conducted by the inspection department of the production unit. Only when each test of the factory inspection is qualified, can the product be judged as qualified for the factory inspection and can the product be produced.
6.2.4.3 Only when each test is qualified can the product be judged as qualified for the type inspection. 7 Marking, packaging, transportation and storage
7.1 The loading mechanism can be packaged only after it has passed the inspection with the tunnel boring machine. The packaging quality must ensure that the loading mechanism is not mechanically damaged or lost during transportation and storage. The packaging of transmission parts must be moisture-proof and dust-proof. 7.2 When the loading mechanism is shipped as a single piece, it should generally meet the following requirements: 7.2.1 The outer wall of the packaging box should clearly indicate the following: a) Name of the loading mechanism; b) Quality; c) Overall dimensions of the packaging box; d) Lifting position; e) Name and address of the manufacturer: f) Name, address and destination station of the consignee; g) Transportation precautions and necessary signs; h) Packing date. 7.2.2 The manufacturer should provide the following attachments and technical documents with the product: a) Product certificate and inspection results; b) Necessary drawings and materials; c) Product packing list. 7.3 When storing spare parts, anti-rust measures should be taken for spare parts that are prone to rust. Industrial rubber should be stored in a room at a temperature of 5 to 35°C. 7.4 The product should be kept clean during transportation and storage and should not come into contact with acid or alkali substances. Transmission parts should not be subjected to severe vibration and impact.
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