1、BRITISH STANDARD BS1090:1970 Specification for Flameproof hand-held electric drilling machines primarily for use in mines UDC 621.953 758.364:622.233.05 83BS1090:1970 This BritishStandard, having been approved by the Mining andQuarrying Requisites Industry Standards Committee,was published underthe
2、authorityof the Executive Boardon 11December1970 BSI01-2000 First published April1943 First revision December1970 The following BSI references relate to the work on this standard: Committee reference MQE/10 Draft for comment68/34029 ISBN 0 580 06365 8 Co-operating organizations The Mining and Quarry
3、ing Requisites Industry Standards Committee, under whose supervision this BritishStandard was prepared, consists of representatives from the following Government department and scientific and industrial organizations: Association of Mining Electrical and Mechanical Engineers* British Electrical and
4、Allied Manufacturers Association British Steel Industry* Engineering Equipment Users Association Federation of Associations of Mining Equipment Manufacturers Federation of Manufacturers of Construction Equipment and Cranes Institute of Quarrying Institution of Mechanical Engineers Institution of Min
5、ing Engineers* Mechanical Handling Engineers Association Ministry of Technology National Coal Board* The industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this BritishStandard:
6、 British Compressed Air Society British Mining and Quarrying Tools Association Council of Underground Machinery Manufacturers Ministry of Defence (Army Department) National Union of Mineworkers Amendments issued since publication Amd. No. Date CommentsBS1090:1970 BSI 01-2000 i Contents Page Co-opera
7、ting organizations Inside front cover Foreword ii 1 Scope 1 2 Constructional requirements 1 3 Motor 1 4 Switch 1 5 Cable termination 2 6 Limits of permissible temperature rise 2 7 Motor torque 2 8 Current of stalled machine 2 9 Tests 2 10 Marking 3 Figure 1 Dimensions of chuck 4 Figure 2 Moulded cab
8、le end 5BS1090:1970 ii BSI 01-2000 Foreword This standard makes reference to the following BritishStandards: BS229, Flameproof enclosure of electrical apparatus. BS309, Whiteheart malleable iron castings. BS310, Blackheart malleable iron castings. BS970, Wrought steels in the form of blooms, billets
9、, bars and forgings. BS1400, Copper alloy ingots and copper and copper alloy castings. BS2593, Rotary drill rods and tungsten carbide tipped rotary drill bits for dry drilling, principally in coal. BS2613, The electrical performance of rotating electrical machinery. BS2757, Classification of insulat
10、ing materials for electrical machinery and apparatus on the basis of thermal stability in service. BS3101, Intrinsically-safe remote-control circuits associated with restrained plugs and sockets for use in coal mines. This BritishStandard, prepared under the authority of the Mining and Quarrying Req
11、uisites Industry Standards Committee, was first published in1943. This revised edition takes cognizance of current practice and in accordance with United Kingdom policy, is appropriately written in metric units. The prime requirements of this standard relate to flameproof hand-held electric drilling
12、 machines used principally in coal mines in the United Kingdom, but certain provisions have been made to admit apparatus of this type as used in other industries. The drilling machine handle incorporates a grip-operated switch by which the machine can be started and stopped. It is current practice i
13、n the UK for the switch in the handle to make and break a control circuit through a pilot conductor in the flexible cable, the circuit being completed by the earthing conductor. This BritishStandard, however, provides for an alternative design of switch for making and breaking the load current. A Br
14、itish Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a fr
15、ont cover, an inside front cover, pagesi andii, pages1 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS1090:1970 BSI 01-2000 1 1 Scope T
16、hIS BritishStandard applies solely to flameproof hand-held electric drilling machines intended primarily for shot-hole drilling in mines. 2 Constructional requirements 2.1 The drilling machine shall embody an electric motor, gearbox and chuck, and shall have two handles (one with a grip-operated swi
17、tch for starting and stopping). Provision shall be made to receive a flexible cable connection. 2.2 The enclosure of the electrical apparatus comprising the motor, the switch, and plug and socket coupling, shall be designed to be flameproof in accordance with the requirements of BS229 1) . 2.3 The t
18、ensile strength of the material of the external casing shall be not less than230N/mm 2 2)(15tonf/in 2 ). 2.4 Unless otherwise agreed between the manufacturer and the purchaser, no external component (and fan, if any) shall be made of aluminium, magnesium or titanium, neither shall any alloy containi
19、ng aluminium and/or magnesium and/or titanium be used unless the total content of these three constituents does not exceed15% by weight, and in which the content of magnesium and titanium together does not exceed10% by weight. No component part shall be painted or coated with preparations containing
20、, in metallic form, aluminium, magnesium or titanium. NOTE 1These limitations have been imposed to avoid the hazards of incendive sparking due to friction between rusted steel or iron and the metals described. NOTE 2Acceptable materials are included in the following BritishStandards: BS309, “Whitehe
21、art malleable iron castings”. BS310, “Blackheart malleable iron castings”. BS970, “Wrought steels in the form of blooms, billets, bars and forgings”. BS1400, “Copper alloy ingots and copper and copper alloy castings”. 2.5 The preferred chuck dimensions shall be in accordance with Figure 1. The drivi
22、ng slots shall be of such form and dimensions that they will engage with diamond or turbine section drill rods conforming to BS2593 3) . The driving slots of the chuck shall be effectively shrouded. 2.6 The chuck shall have a through hardness figure of not less than40 Rockwell C. NOTEChucks designed
23、 with other than the dimensions of Figure 1, provided they satisfy all other relevant requirements specified herein, are deemed to comply with this BritishStandard. 2.7 The position of the handles with respect to the centre line of the chuck shall be such that the force on each handle does not excee
24、d265N under maximum torque conditions. 2.8 Direct access to any moving part of a fan shall not be possible in normal operation. 2.9 The complete machine shall be of robust construction to withstand the duty required and be designed to exclude, as far as practicable, the ingress of dust and water. 3
25、Motor 3.1 The motor shall be a cage motor and, unless otherwise agreed between the purchaser and the supplier, shall be capable of operating on a3-phase electric supply system of125V (max.)50Hz, or110V (max.)150Hz. 3.2 The design of the motor shall be such that the output of the drilling machine doe
26、s not exceed1.1kW at the declared speed of the driving chuck with rated voltage applied to the motor terminals, and that the current does not exceed15A at this output. 3.3 The motor shall be capable of giving its rated output for30minutes continuously without exceeding the temperature rise specified
27、 in Clause6. 3.4 Unless otherwise agreed between the purchaser and the supplier the current of the motor, when the machine is stalled, shall not exceed40A at125V (max.)50Hz, or110V (max.)150Hz. 4 Switch 4.1 The switch for starting and stopping the motor shall be designed to be operated by a spring-l
28、oaded grip in a handle of the machine, so arranged that, upon release of the grip, the contacts open. The design of the switch shall be such that dust cannot enter and prevent re-opening of the contacts. 4.2 The switch shall be designed to make and break the control circuit or, if so specified by th
29、e purchaser, to make and break the line circuit directly. 4.3 When the switch is designed to operate in a control circuit which includes a pilot conductor and the earthing conductor in the flexible cable, the control circuit shall be completed by contacts on the switch irrespective of the contact, i
30、f any, existing between the operating spindle or lever and the metallic casing of the machine. 1) BS229, “Flameproof enclosure of electrical apparatus”. 2) 10N/mm 2 =0.64749tonf/in 2 . 3) BS2593, “Rotary drill rods and tungsten carbide tipped rotary drill bits for dry drilling, principally in coal”.
31、BS1090:1970 2 BSI 01-2000 4.4 Provision shall be made adjacent to the switch for the fitting, when required, of a rectifier 4)in theearth line of the switch circuit. 4.5 If the switch is designed to operate in the line circuit directly it shall make and break the circuit on all three phases. 4.6 The
32、 switch shall be capable of satisfying the mechanical and electrical endurance tests specified in9.2.1. 5 Cable termination 5.1 Provision for the incoming cable shall be made by means of a bolted or restrained type plug and socket. The plug shall include a cable gland suitable to receive and to hold
33、 securely the flexible cable. Where a restrained type plug and socket is used in conjunction with a control circuit, it is essential for the pilot contact to make after, and break before the power contacts. 5.2 Unless otherwise agreed between the purchaser and the supplier, the plug shall include te
34、rminals to receive a five-core cable, each conductor having a cross-sectional area of not less than6mm 2 . Where the plug is to accommodate a screened cable, an additional terminal shall be provided to secure such screen. 5.3 All external metallic parts of the complete machine shall be in effective
35、electrical connection with an earthing terminal which shall be so designed that the attachment thereto of the earthing conductor can be mechanically secure and electrically efficient. 5.4 Except where otherwise agreed between the purchaser and the supplier, provision shall be made in the cable gland
36、 to accommodate a strain relief moulding forming an integral part of the cable end, the dimensions being as stated in Figure 2. 6 Limits of permissible temperature rise 6.1 Conditions of test. Tests shall be made at the normal air temperature of the test room and shall begin when the temperature of
37、the windings is the same as that of the atmosphere. Tests should be made as prescribed in BS2613 5)on the basis of a full load run of the complete machine at the rated voltage of the motor for a period of not less than30minutes. 6.2 Limitations. The following limits in temperature rise shall in no i
38、nstance be exceeded: 7 Motor torque The motor shall be capable of developing, without injury and after it has attained the temperature corresponding with its rating, not less than twice full load torque for30seconds. 8 Current of stalled machine The motor shall be capable of carrying, without injury
39、 and after it has attained the temperature corresponding with its rating, the current of the stalled machine (see3.4) for a period of15seconds. 9 Tests 9.1 General. All tests, except the type tests for compliance with BS229 6) , shall be carried out by the manufacturer unless otherwise agreed betwee
40、n the purchaser and the manufacturer. Tests to determine flameproofness shall be carried out by the relevant certifying authority. 9.2 Type tests. Type tests shall be conducted on a representative drilling machine of each type of design to determine its characteristics and show compliance with this
41、BritishStandard. 9.2.1 Endurance tests. The following tests are to determine the mechanical and electrical endurance of the switch and shall be made at the supply frequency for which the machine is designed: 1) Switches designed to make and break a control circuit shall be capable of being operated1
42、0000times without mechanical or electric breakdown, when carrying a current of1A at50V d.c. 4) For United Kingdom practice see BS3101, “Intrinsically-safe remote-control circuits associated with restrained plugs and sockets for use in coal mines”. 5) BS2613, “The electrical performance of rotating e
43、lectrical machinery”. 1) Windings and cores. For class A insulation: a 55K b For class E insulation: 65K For class B insulation: 75K 2) Case. External parts of the machine, excluding the handles:40K 3) Handles. Handle grips of the machine: 20K a As classified in BS2757, “ Classification of insulatin
44、g materials for electrical machinery and apparatus on the basis of thermal stability in service”. b K=1 C interval of temperature. 6) BS229, “Flameproof enclosure of electrical apparatus”.BS1090:1970 BSI 01-2000 3 2) Switches designed to make and break the line circuit directly shall be capable of b
45、eing operated5000times without suffering mechanical or electrical breakdown and without flashover between terminals or to the frame when carrying3-phase current equal to that of the motor when stalled. For the purpose of this test the voltage between phases, as measured at the terminals of the switc
46、h, shall be not less than125V on open circuit and not less than100V at the prescribed current, at a power factor equal to that of the motor when stalled. 9.2.2 High voltage tests. High voltage tests shall be made on the drilling machine and the plug, as follows, with an approximately sinusoidal a.c.
47、 voltage of between42Hz and60Hz applied for not less than one minute: 1) 1000V applied between the insulated windings together with the terminals associated therewith (including the switch if designed to make and break the line circuit directly) and the frame of the motor; also between the windings
48、and the pilot terminal, where fitted. 2) Where the switch is designed to operate in a control circuit of25V or less,500V applied between the contacts of the switch and also between the pilot terminal of the switch and the frame of the motor. 9.3 Routine tests 9.3.1 High voltage test. Each complete d
49、rilling machine, with or without its plug, shall be subjected to the following tests; each test shall be made with an approximately sinusoidal a.c. voltage of between42Hz and60Hz: 1) To be applied between the insulated windings together with the terminals associated therewith (including the switch if designed to make and break the line circuit directly) and the frame of the motor; also between the windings and the pilot terminal, where fitted: a) 1000V for not less than one minute, or b) 1000V plus twice the rated voltage of the drilling machine, for not less than5secon
