5-1机械系统/零件外文翻译资料

• 1. Mechanical System/ Components
     1. Bearing, Seals

(1) All bearings used throughout the Crane shall be supplied from an internationally recognised and approved manufacturer of bearings. All bearings shall have standardised equivalents across a range of manufacturers.

(2) All bearings shall be anti‑friction type except for the shafts or pins with a limited small angle rotation such as the gantry truck equaliser pins. For all types of bearings, an effective means of lubrication and sealing shall be provided.

5-1.2 Gearing

1. Gears shall be of helical or herringbone type and designed in accordance with the relevant BS, AGMA or DIN standards.
2. The durability rating for the main hoist, trolley and boom hoist drives shall be based on a minimum service factor of 1.5 for rated load and rated speed and a wear factor of 0.7.
3. All other gearing shall be selected or designed for a minimum service factor of 1.0.
4. The gearing for all main drives shall be totally enclosed in a split, oil tight steel box with oil bath lubrication
5. All open gears for the auxiliary drive systems shall be properly covered or guarded with covers or guards for safety. The cover or the guard shall be easily removable and have adequate ports to check and lubricate the gears.
6. Oil or grease tray of a removable type under each open gear shall be provided to receive excess lubricant. Prevention against overflow of oily water out of such trays during rainy operational condition shall be taken into consideration in the design.

5-1.3 Gear Reducers

(1) The gearboxes shall be fitted with effective gear inspection windows and sight glass type oil level gauges. The gearboxes shall be free from oil leakage.

(2) The gearboxes shall be designed to allow easy replacement of gears or gear shafts without removing the whole gearbox assembly from its mounting base.

(3) Drain pipes with shut off valves and end plugs shall be fitted to each gearbox for draining lubricant. An appropriate drain receiving space for each drain outlet shall be provided.

• • 1. Wire Rope Winch Drums

1. The main hoist and boom hoist drums shall be of rolled welded steel construction, dynamically balanced and complete with machined grooves for single layer winding of wire ropes.
2. The grooves on the drum shall be pitched so that there is clearance between the turns of rope on the drum and also clearance between the part of the rope leading onto, or leaving the drum, and the adjacent coil.
3. The diameter of the drum at the bottom of the groove shall not be less than 30 times the nominal rope diameter.
4. The drum shall be flanged at both ends.
5. The wire ropes shall be secured to the drum by a suitable clamping device. The design of this device will be subject to review by the Purchaser during the design stage.
6. The length of the hoist drum and wire ropes shall be such that when the headblock is at its lowest specified point at least three full turns of rope shall remain on the drum. When the load is at its highest possible point at least one empty groove shall separate two adjacent ropes, depending on the drum configuration.
7. With the boom in the fully lowered position there should be at least three full turns of each rope remaining on the boom drum, and in the fully raised position at least one empty groove shall separate the two ropes.

5-1.5 Wire Rope Sheaves

1. All wire rope sheaves shall be of cast steel or forged steel construction with smoothly machined grooves. Fabricated or gravity cast sheaves are not acceptable.
2. Minimum designed life of the sheave, specifically the groove and bearing retainer, shall be 25,000 hoist-operating hours.

(4) The pitch diameter shall be at least 30 times the wire rope diameter. An equaliser sheave may have a smaller diameter provided that the small radius will not reduce the safety factor of wire rope below the specified value.

(5) All running sheaves shall be fitted with anti-friction roller bearings with grease fittings for pressure lubrication.

(6) In the locations where the wire ropes can jump or ride off the sheave, rope guards shall be fitted.

5-1.6 Wire Ropes

(1) The factor of safety shall not be less than 7 for main hoist, boom hoist.

(2) four wire ropes for hoist and two wire rope for boom hoist.

(3) Wire rope lubricant shall be carefully selected to minimise the dripping problems.

5-1.7 Shafts, Axles

(1) Shafts and axles shall be designed to include acceptable allowances and finishes for stress concentrations at fillets, keyways and lubrication holes. All splines, gear teeth, or threads shall run out smoothly or shall be undercut and surface finish shall be uniformly smooth and free from defects.

(2) For any long driving shaft the torsional deflection shall not affect the coupling or gearing associated with the shaft.

(3) Shafts shall be properly covered or guarded for safety.

5-1.8 Couplings

1. An internationally recognised manufacturer shall supply all main drive couplings.

(2) Couplings shall be properly covered or guarded for safety. The cover or the guard shall allow easy access for lubrication of the coupling without removing entire cover or guard.

(3) For any spline coupling a visible wear indicator with a maximum wear limit mark shall be provided.

5-1.9 Metal Wheels

1. Gantry and trolley wheels shall be double-flanged type forged steel wheel with hardened tread.

5-1.10 Pins, Pin Brackets

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英语译文共 14 页，剩余内容已隐藏，支付完成后下载完整资料

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资料编号：[234394]，资料为PDF文档或Word文档，PDF文档可免费转换为Word

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