1、BRITISH STANDARD BS 4409-2: 1991 Screw conveyors Part 2: Specification for portable and mobile type (augers)BS4409-2:1991 This British Standard, having been prepared under the directionof the Mechanical Handling Standards Policy Committee, was published under the authority of the Standards Board and
2、 comes into) effect on 30August 1991 BSI 10-1999 First published January 1970 Second edition August 1991 The following BSI references relate to the work on this standard: Committee reference MHE/9 Draft for comment 88/74008 DC ISBN 0 580 19824 3 Committees responsible for this British Standard The p
3、reparation of this British Standard was entrusted by the Mechanical Handling Standards Policy Committee (MHE/-) to Technical Committee MHE/9, upon which the following bodies were represented: AFRC Institute of Engineering Agricultural Engineers Association Associated Offices Technical Committee Asso
4、ciation of British Mining Equipment Companies Association of Consulting Engineers Automated Material Handling Systems Association British Aggregate Construction Materials Industries British Coal Corporation British Rubber Manufacturers Association British Steel Industry Coke Oven Managers Associatio
5、n Cranfield Institute of Technology Department of Trade and Industry Mechanical Engineering and Manufacturing Technology Division (MMT) Electrical, Electronic, Telecommunications and Plumbing Union Electricity Supply Industry in United Kingdom Engineering Equipment and Materials Users Association He
6、alth and Safety Executive Institution of Mechanical Engineers Mechanical Handling Engineers Association Solids Handling and Processing Association The following bodies were also represented in the drafting of the standard, through subcommittees and panels: National Farmers Union Royal Society for th
7、e Prevention of Accidents Amendments issued since publication Amd. No. Date CommentsBS4409-2:1991 BSI 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Materials 1 4 Dimensions 1 5 Shafts and drive shaft ends 1 6 Guarding 1 7 Drives 2 8 Stabili
8、ty of mobile screw conveyors 3 9 Suspension and positioning of screw conveyors 3 10 Marking 3 Appendix A Information to be supplied by the purchaser 4 Figure 1 Principal dimensions of a screw conveyor (portable and mobile type) 2 Table 1 Dimensions of screw conveyors (portable and mobile type) 2 Pub
9、lication(s) referred to Inside back coverBS4409-2:1991 ii BSI 10-1999 Foreword This revision of this Part of BS4409 has been prepared under the direction oftheMechanical Handling Standards Policy Committee. It supersedes BS4409-2:1970 which is withdrawn. It applies to portable and mobile type screw
10、conveyors (augers). Fixed trough type screw conveyors are covered by BS4409-1. This Part of BS4409 has been revised to align with modern manufacturing practice and usage. Safety requirements will be the subject of a future part of the standard. The attention of users of this British Standard is draw
11、n to the need to comply with all the statutory instruments and regulations appropriate to the equipment covered by the standard, and to its siting and use. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their
12、correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 4, an inside back cover and a back cover. This standard has been updated (see co
13、pyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4409-2:1991 BSI 10-1999 1 1 Scope This Part of BS4409 specifies the requirements for the materials, dimensions, power provision and the stability and positioning of porta
14、ble and mobile screw conveyors (augers) of the tubular type constructed of carbon steel and stainless steel in sizes from100mm to250mm nominal diameter. NOTE 1Information to be supplied by the purchaser is listed inAppendix A. NOTE 2The titles of the publications referred to in this standard are lis
15、ted on the inside back cover. 2 Definitions For the purposes of this British Standard, the following definitions apply. 2.1 nominal diameter of a screw conveyor the external diameter of the tubular body (tube) 2.2 coupling shaft a solid member which either connects portions of tubular shafts, or ter
16、minates tubular shafts at the drive and tail ends 2.3 radial clearance the clearance between the helical screw and the interior of the tube 2.4 drive shaft end the end of the solid shaft to which the drive is fitted 2.5 effective length of conveyor the distance between the end of the screw shaft at
17、the feed point and the centre of the delivery opening 2.6 overall length of conveyor the overall length of a conveyor including legs, motor, or any fittings 2.7 portable conveyor a conveyor designed to be lifted and moved as a unit manually from one position to another 2.8 mobile conveyor a conveyor
18、 mounted on wheels, crawlers or pontoons 3 Materials Sheet steel components of portable and mobile screw conveyors (augers) shall be constructed of carbon steel complying with BS1449-1 or stainless steel complying with BS1449-2. Steel tubular shafts shall comply with BS6323-1, and BS6323-3 or Part B
19、S6323-8. Drive shafts shall be manufactured from steel complying with BS970-1. 4 Dimensions NOTEThe dimensions specified in the standard apply to carbon steel and stainless steel components and revised dimensions may be required for other materials. 4.1 Tubes and helical screws The dimensions of tub
20、es and helical screws shall be in accordance withTable 1. NOTE 1The relevant dimensions are illustrated in Figure 1. NOTE 2The radial clearance should be determined by the manufacturer in accordance with the characteristics of the material to be handled and the working conditions. Unless otherwise a
21、greed between the purchaser and manufacturer the radial clearance should be not less than6mm. 4.2 Discharge openings No dimension of the discharge opening shall be less than the diameter of the tube. 5 Shafts and drive shaft ends The shaft of the helical screw shall be either solid or a tubular shaf
22、t fitted with coupling shafts. Drive shaft ends shall comply with BS4506. 6 Guarding The manufacturer shall provide the purchaser with a written statement detailing the extent of the guarding supplied by the manufacturer. NOTEAttention is drawn to the appropriate statutory requirements.BS4409-2:1991
23、 2 BSI 10-1999 Table 1 Dimensions of screw conveyors (portable and mobile type) (seeFigure 1) a 7 Drives 7.1 General The power unit shall be continuously rated and shall withstand the working conditions arising from the siting and use of the screw conveyor. NOTEThe prime movers may include an electr
24、ic motor, internal combustion engine, hydraulic motor or tractor power take-off. When considering prime movers, the following should be borne in mind. a) A prime mover of adequate power and suitable type should be used. b) Any electric motor should comply with the Institution of Electrical Engineers
25、 Regulations 1) . c) If electric motor drives are used due consideration should be given to the starting torque and to restarting under load. 7.2 V-belts Where V-belt drives are used, they shall comply with BS3733 or BS3790. 7.3 Starting and stopping Where direct on-line starters are used they shall
26、 be fixed to a rigid structure. At any point where an operator has access to the conveyor means shall be provided for stopping the conveyor in an emergency. Every device controlling a prime mover shall be clearly marked to indicate how the prime mover can be stopped and re-started. NOTEThe controls
27、should permit a safe start up or re-start procedure to be followed. Nominal diameter of screw conveyor b Tube wall thickness (min.) Outside diameter of shaft (min.) Wall thickness of tubular shaft (min.) Helical screw blade root thickness (min.) Drive shaft end and coupling shaft diameter (min.) A J
28、 C G E F mm mm mm mm mm mm 100 115 150 200 250 1.0 1.6 1.6 2.0 3.2 19 25 38 38 60.3 1.6 1.6 2.9 2.9 4.0 1.5 2.0 2.6 2.6 3.0 15 19 25 25 50 a Letters refer to dimensions indicated inFigure 1. b This is the same as the external diameter of the tube (see2.1). Figure 1 Principal dimensions of a screw co
29、nveyor (portable and mobile type) 1) Available from the Institution of Electrical Engineers, Savoy Place, Victoria Embankment, London WC2R 0BC.BS4409-2:1991 BSI 10-1999 3 8 Stability of mobile screw conveyors Every mobile screw conveyor shall be stable both longitudinally and laterally under travell
30、ing and operating conditions. 9 Suspension and positioning of screw conveyors Portable conveyors shall be provided with suitable means to enable them to be supported from a point near the outlet end to allow operation within the range of design working angles, horizontal and vertical. The means adop
31、ted shall be such as to ensure that the centre of gravity of the conveyor in any operating position lies sufficiently below the point of support to ensure that the conveyor is stable in operation. For a screw conveyor fitted with a tripod support suitable means shall be provided for lifting and repo
32、sitioning the feed end of the screw conveyor and it shall be fitted with a locking arrangement to sustain the screw conveyor at the required angle. 10 Marking Screw conveyors shall be permanently and legibly marked with the following information: a) the number and date of this British Standard, i.e.
33、 BS4409-2:1991 2) ; b) the manufacturers name or trademark. 2) Marking BS4409-2:1991 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the clai
34、m is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party certification of conformity, which may also be desirable.BS4409-2:1991 4 BSI 10-1999 Appendix A Information to be supplied by the purchaser The purchaser should supply t
35、he following information in his enquiry or order: a) size and type of conveyor, and nominal diameter (in mm); b) required throughput of screw conveyor, (in m 3 /h), at specified working angle(s) see c) with specified material(s) see k); c) whether the conveyor is to operate horizontal or inclined, a
36、nd details of working angle(s); d) details of any special operating conditions such as damp or corrosive atmosphere, fire or explosion hazard, abnormal ambient temperatures, noise level limitations; e) effective length of conveyor (in m) (see2.5); f) overall length of conveyor (in m) including legs,
37、 motor, or any other fittings (see2.6); g) constructional materials; h) special sealing requirements; i) weatherproofing; j) type of drive; k) material(s) to be handled: 1) description; 2) density; 3) moisture content; 4) lump sizes and percentage proportions of lump size ranges; 5) abrasive/non-abr
38、asive/corrosive; 6) temperature; 7) other characteristics; l) if a performance test is required; m) prime mover (see clause7): 1) electrical equipment: i) whether or not the purchaser is to supply motor; ii) whether or not the purchaser is to supply starter, iii) power supply (voltage, a.c. or d.c.,
39、 phase, frequency); 2) any special motor/starter requirements; n) stopping devices: whether or not the purchaser is to supply stopping device; o) statutory, requirements: statutory provisions to which the conveyor will be subject and the extent of the guarding to be provided by the manufacturer to e
40、nsure its safe working.BS4409-2:1991 BSI 10-1999 Publication(s) referred to BS 970, Specification for wrought steels for mechanical and allied engineering purposes. BS 970-1, General inspection and testing procedures and specific requirements for carbon, carbon manganese, alloy and stainless steels.
41、 BS 1449, Steel plate, sheet and strip. BS 1449-1, Specification for carbon and carbon-manganese plate, sheet and strip. BS 1449-2, Specification for stainless and heat-resisting steel plate, sheet and strip. BS 3733, Specification for endless V-belt drives for agricultural purposes. BS 3790, Specif
42、ication for endless wedge belt drives and endless V-belt drives. BS 4409, Screw conveyors. BS 4409-1, Specification for fixed trough type 3) . BS 4506, Specification for shaft ends. BS 6323, Specification for seamless and welded steel tubes for automobile, mechanical and general engineering purposes
43、. BS 6323-1, General requirements. BS 6323-3, Specific requirements for hot finished seamless steel tubes. BS 6323-8, Specific requirements for longitudinally welded stainless steel tubes. 3) Referred to in the foreword only.BS 4409-2: 1991 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandard
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