Classifications

• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/36—Component parts
  • E02F3/40—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets

Definitions

• This invention concerns a bucket with a screening device to be fitted to equipment such a tractor loaders, excavators or front-loaders. In conjunction with soil haulage using such equipment, it is often necessary to sort materials by size into their component parts. This may concern sand and gravel fractions or bark from a barking plant, after which the various fractions can be used in gardens.
• the Swedish patent application 466839 as published for opposition, like 454711, has a drum. In this case the drum is placed at right angles to the direction of travel and screening is done in two stages, by first screening and then emptying the coarse material retained in the bucket.
• the Swedish patent application 464094 as published for opposition shows a solution for buckets with an inner, basket-like bucket which has been mounted to retain coarse material, which in a later, second stage can be emptied. The operation of this inner bucket requires an additional hydraulic piston.
• the object of this invention is to increase the screening capacity in comparison with that of previously known buckets incorporating integrated screens. This is achieved by the screen, placed above a hole in the lower part of the bucket, being given a rocking movement in relation to the bucket so that the hole in the bottom of the bucket is always covered by the screen.
• a bucket with a screen in accordance with this invention has a considerably greater capacity.
• the rocking motion results in the material always being thrown to the centre of the screen and then moving towards the edges and thereby achieving a considerably greater capacity. This is a considerable improvement on screens that only move in the plane.
• FIG. 1 is a section through the basic design of the bucket. The section has been drawn with a view to simplification.
• a standard bucket (1) for a loader/ tractor-excavator has been modified by the following equipment. Inside is located a hydraulic motor (7) which is driven by the equipment's hydraulic unit by means of hose connections (9). From the motor's drive shaft and via an eccentric wheel coupled to a crankshaft (6), a fixture device (5) between the crankshaft (6) and pendulum screen (4) is made to move so that the screen (4) with bearing (8) in the upper part of the triangular side walls (10) perform a rocking movement.
• the bucket is in other respects designed as a normal bucket with the front part designed for excavation, including wear parts (3) for a long service life.
• the connection to the equipment's boom is mounted on the top side (2).
• the equipment like a tractor-excavator, has a slewable boom, with several hinged parts driven by a hydraulic system. There is often also a simple hydraulic connection that permits changes between different buckets or other equipment (brushes, pallet forks, etc.).
• the hydraulic connection is connected to the equipment by a connection (2) that often consists of two tubes at a standard distance from one another. The lengths of the pipes can vary but are generally about 30 to 50 cm.
• the design of the bucket is such that it is also easy to excavate in harder material, such as gravel or argillaceous masses. This is achieved by the front edge of the bucket being designed as an ordinary excavator bucket. This implies that the excavating edge h reinforced by wear material (3).
• the screen (4) is also located so that there is a certain safety distance from the edge, so that the screen is not subjected to direct contact with material that has not been loosened. Inside the safety distance mentioned above, the underside of the bucket consists of a hole (11) through which the fine material can pass during operation of the screen.
• the bucket is designed so as to achieve stability, i.e. a welded construction with full, solid sides and a rear section which extend up to the same height as the sides. Certain reinforcement may be necessary round the connection (2) of the hydraulic gripping device.
• Holes (8) are provided in the upper part of the bucket's (1) sides. Through these holes (8) pass a pipe which passes through the sides (10) of the screen located inside the bucket sides.
• the pipe is provided with suitable bushes to ensure reliable movement of the screen (4).
• the sides (10) of the screen on each side in the bucket are connected in the lower base area by a grille (screen) (4). It has been found that seen from the side, the end length of the screen should be of the same order of size as the perpendicular distance from the screen (4) to the bearing on the through pipe (8). Especially the distance from the bearing (8) to the screen must be in the range of 50 to 150 per cent of the edge length of the screen.
• In the outer edge of the screen (4) shall be fastened an attachment for the grille. The procedure is the same on the front edge and a clamped joint is placed at the sides. It is also possible to attach the screen (4) permanently by welding to the sides (10), something that is not so practical if it is desirable to change to another screen mesh width.
• a rocking movement is imparted to the screen (4) by a hydraulic motor (7), with the bearings (8) as the pivot point.
• This motor is driven by a hydraulic motor fitted to the equipment.
• the connection is made by means of hydraulic hoses (9) (flow in and flow out) with quick-action couplings for the sake of simplicity. It should be possible to regulate the speed of the motor by means of a valve for the hydraulic pressure/flow, to achieve various cradle vibration frequencies.
• Connected to the motor is a coupling which is selected so that any overload will not deform the screen (4). It has been found that a standardized chain connection is suitable. To the connection is connected an eccentric wheel on a bearing.
• the eccentric wheel in turn, is connected to a crankshaft supported in journals, which is connected to the rear edge of the screen (see the arrow indicating the direction of bucket travel when loading). It has been found that a rocking movement of about 1 to 5 cm provides the best results.
• the work with the bucket is performed by the bucket being filled with material, in the normal way.
• the bucket is then raised to the horizontal position and the hydraulic motor (7) started by hydraulic oil being supplied through the hydraulic hoses (9). In this way the material that passes through the screen will fall through the opening (11).
• the coarser material will remain on the screen, which may be emptied through the bucket, after a lateral movement, at another location than the normal one, i.e. by the whole equipment's boom being moved to the emptying position.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mining & Mineral Resources (AREA)
• Civil Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• Shovels (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20393728

Family Applications (1)

Country Status (5)

Cited By (1)

Citations (8)

• 1994
  • 1994-04-20 SE SE9401348A patent/SE501521C2/sv unknown
• 1995
  • 1995-04-18 WO PCT/SE1995/000413 patent/WO1995029297A1/en not_active Application Discontinuation
  • 1995-04-18 EP EP95916900A patent/EP0705371A1/en not_active Withdrawn
  • 1995-12-19 NO NO955169A patent/NO303136B1/no unknown
  • 1995-12-19 FI FI956105A patent/FI956105A/fi unknown

Patent Citations (8)

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