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This standard is developed in accordance with the rules given in GB/T 1.1-2009 Directives for standardization - Part 1: Structure and drafting of standards.
This standard was proposed by the China National Coal Association.
This standard is under the jurisdiction of the National Technical Committee on Coal Equipment of Standardization Administration of China.
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Introduction
With the development of coal industry and the progress of science and technology, various specifications and models of the auto-moving return end for extensible belt conveyor (hereinafter referred to as “auto-moving return end") are widely used in coal mining face. The auto-moving return end is applicable for the connection between the scraper loader and the extensible belt conveyor in the headentry of coal mine, and has the functions such as auto-moving based on the mutual support between the scraper loader and the auto-moving return end, adjusting the deflection of conveyor belt at the end of extensible belt conveyor, and adjusting the height of the scraper loader head. At present, there are many auto-moving return end manufacturers in China, but no corresponding technical standards have been formulated, which has affected the development of auto-moving return end to some extent. Therefore, it is necessary to formulate general technical conditions applicable for auto-moving return end to guide and standardize its production and manufacture.
The auto-moving return end for extensible belt conveyor
1 Scope
This standard specifies the terms and definitions, parameters, models, technical requirements, test methods, inspection rules as well as marking, packaging, transportation and storage of the auto-moving return end for extensible belt conveyor in the headentry of coal mine.
This standard is applicable to the auto-moving return end for extensible belt conveyor in the headentry of coal mine.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 13306-2011 Plates
GB 25974.1-2010 Powered support for coal mine - Part 1: General specification
GB 25974.2-2010 Powered support for coal mine - Part 2: Specification for power set legs and rams
GB 25974.3-2010 Powered support for coal mine - Part 3: The hydraulic control system and valves
MT/T 73-2008 Belt conveyor for coal mines - Idler - Dimension
MT 76-2011 Emulsifying oil, concentrate fluid and high-water content hydraulic fluid used for powered support
MT/T 94-1996 Powered support - Series of inner diameter of column and jack as well as outer diameter of piston rod
MT/T 98-2006 Inspection specifications of hose and hose kit for powered support
MT/T 154.1-2011 The model designation of electromechanical product for coal mine - Part 1: Directive
MT/T 587-2011 Manufacturing technical specification for structural parts of powered support
MT 821-2006 Belt conveyor for coal mines - Idlers - Technical specification
MT/T 986-2006 Quick adapter with U pin and accessories for mine
MT/T 1063-2008 Roller for belt conveyor for coal mines - Technical specification
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
exosmic leakage
the leakage of working fluid at an average rate of more than one drop every 5min at the exosmic leakage position of hydraulic components
[Term and definition in 3.5.1, GB 25974.1-2010]
3.2
rated working pressure
the opening pressure set for the safety valve of hydraulic height-adjustment cylinder.
3.3
rated output pressure
the pump station pressure determined by the auto-moving return end.
4 Parameters and models
4.1 Basic parameters
Figure 1 is the general assembly drawing for auto-moving return end and Figure 2 is the dimensional sketch for cross section of combined frame, with the basic parameters as follows:
Keys:
1——rear end frame;
2——combined frame;
3——bend pulley;
4——hinged frame;
5——belt pulley;
6——traveling trolley;
7——hydraulic pushing cylinder;
8——belt conveyor belt;
9——front end frame;
10——idler;
11——cleaner;
12——hydraulic valve;
13——hydraulic height-adjustment cylinder;
14——hydraulic lateral-moving cylinder.
Figure 1 General assembly drawing for auto-moving return end
Figure 2 Dimensional sketch for cross section of combined frame
Basic parameters for pushing stroke of auto-moving return end, L (mm): 900 (950), 1100, 1800, 2300, 2500, 2600 (2620), 2700 (2750), 2800 (2850), 2900, 3000, 3100, 3500.
Note: figures in brackets are not recommended.
Width of auto-moving return end conveyor belt, B (mm): 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200.
4.2 Models
The models of auto-moving return ends are prepared in accordance with MT/T 154.1-2011, as follows:
Example:
the supporting auto-moving return end for extensible belt conveyor with a belt width of of 1400mm, a pushing stroke of 2700mm and subjected to the third design revision is expressed as DZY1400/2700(C).
Note: the revision S.N. (A) (B) (C)… may be omitted.
5 Technical requirements
5.1 Basic requirements
5.1.1 The auto-moving return end shall be manufactured according to the drawing and technical document approved by prescribed procedures.
5.1.2 The connecting structure between the auto-moving return end and the conveyor belt of extensible belt conveyor or the head of scraper loader shall be safe and reliable.
5.1.3 The connection between various components of the auto-moving return end shall be safe and reliable, and the fasteners shall be provided with anti-loosening measures.
5.1.4 Standard parts, purchased parts and external manufactured parts shall be provided with qualification certificates and can be assembled only after passing the acceptance according to relevant technical documents.
Foreword i
Introduction ii
1 Scope
2 Normative references
3 Terms and definitions
4 Parameters and models
5 Technical requirements
6 Test methods
7 Inspection rules
8 Marking, packaging, transportation and storage
