1 Scope
This part of GB 25974 specifies the terms and definitions, requirements, test methods, inspection rules, marking, packaging and storage for power set legs (hereinafter referred to as legs) and rams of powered support for coal mine.
This part is applicable to legs and rams of powered support for coal mine.
2 Normative References
The following standards contain provisions which, through reference in this part of GB 25974, constitute provisions of this part. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties entering into agreement according to this part are encouraged to research whether the latest editions of these references apply. For undated references, their latest editions are applicable to this part.
GB/T 197-2003 "General Purpose Metric Screw Threads - Tolerances" (ISO 965-1:1998, MOD)
GB/T 228 "Metallic Materials - Tensile Testing at Ambient Temperature" (GB/T 228-2002, eqv ISO 6892: 1998)
GB/T 229 "Metallic Materials - Charpy Pendulum Impact Test Method" (GB/T 229-2007, ISO 148-1:2006, MOD)
GB/T 1184-1996 "Geometrical Tolerancing - Geometrical Tolerance for Features without Individual Tolerance Indications" (eqv ISO 2768-2:1989)
GB/T 1804-2000 "General Tolerances - Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications" (eqv ISO 2768-1:1989)
GB/T 2649 "Methods of Sampling for Mechanical Properties Tests of Welded Joint"
GB/T 2650 "Impact Test Methods on Welded Joints" (GB/T 2650-2008, ISO 9016:2001, IDT)
GB/T 2651 "Tensile Test Method on Welded Joints" (GB/T 2651-2008, ISO 4136:2001, IDT)
GB/T 2652 "Tensile Test Methods on Weld and Deposited Metal" (GB/T 2652-2008, ISO 5178: 2001, IDT)
GB/T 2653 "Methods of Bend and Compression Tests for Welded Joint" (GB/T 2653-2008, ISO 5173: 2000, IDT)
GB/T 2828.1-2003 "Sampling Procedures for Inspection by Attributes - Part 1: Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection" (ISO 2859-1: 1999, IDT)
GB/T 2829-2002 "Sampling Procedures and Tables for Periodic Inspection by Attributes (Apply to Inspection of Process Stability)"
GB/T 3452.1 "Fluid Power Systems - O-Rings - Part 1: Inside Diameters, Cross-sections, Tolerances and Size Identification Code" (GB/T 3452.1-2005, ISO 3601-1: 2002, MOD)
GB/T 3452.3 "Housing Dimensions for O-Ring Elastomer Seals in Hydraulic and Pneumatic Applications" (GB/T 3452.3-2005, ISO 3601-2:1999, MOD)
GB 3836.1-2000 "Electrical Apparatus for Explosive Gas Atmospheres - Part 1: General Requirements" (eqv IEC 60079-0:1998)
GB/T 6394-2002 "Metal-Methods for Estimating the Average Grain Size"
GB/T 11352 "Carbon Steel Castings for General Engineering Purpose" (GB/T 11352-2009, ISO 3755:1991, ISO 4990:2003, MOD)
GB/T 12361 "General Specification of Steel Die Forgings"
GB/T 12467 (All the Parts) "Quality Requirements for Fusion Welding of Metallic Materials" (GB/T 12467.1~12467.5-2009, ISO 3834-1~3834-5:2005, IDT)
GB/T 13306 "Plates"
JB/T 3338.1 "Cylindrical Helical Compression Springs for Hydraulic Parts - Technical Conditions"
MT 76 "Emulsifying Oil Concentrate and High-Water Content Hydraulic Fluid used for Powered Support and Prop"
3 Terms and Definitions
For the purposes of this part of GB 25974, the following terms and definitions apply.
3.1
Actuator
Any type of hydraulic linear reciprocating device referred in this part
3.2
Legs
The actuator approximately arranged in a vertical manner to produce supporting force of the powered support
3.3
Multi telescopic legs
Legs with more than one grade of telescopic stroke
3.4
Rams
All actuators which do not lie within the flow of the support force but which are necessary for the functioning of the powered support
3.5
Foreword I
Introduction II
1 Scope
2 Normative References
3 Terms and Definitions
4 Requirements
4.1 General Requirements
4.2 Assembly Quality Requirements
4.3 Requirements for Main Parts
4.4 Electroplating Requirements
4.5 Performance Requirements
4.6 Material Performance
5 Test Methods
5.1 Test Conditions
5.2 General Requirements
5.3 Assembly and Appearance
5.4 Main Parts
5.5 Electroplating
5.6 Performance Test
6 Inspection Rules
6.1 Inspection Classification
6.2 Inspection Items
6.3 Batching Rules and Sampling Scheme
6.4 Judgment Rules
7 Marking, Packaging, Transportation and Storage
7.1 Marking
7.2 Packaging
7.3 Transportation
7.4 Storage
Appendix A (Normative) Technical Requirements for Electroplated Layer of Actuator Parts
Appendix B (Informative) Calculation of Permissible Stress and Static Force in Actuator
