JP2003047913A - Bucket equipped with sieving apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sieving apparatus capable of smoothly carrying out sieving operation, highly durable, and excellent in a sieving property, with respect to a bucket which is to be attached to a power shovel and which is equipped with the sieving apparatus for carrying out sieving work of earth and sand. SOLUTION: A sieving apparatus comprises an arc-like sieving face 2 in the back and forth direction of a bucket, a swinging arm 32 extended upward from the arc-like rim of the sieving frame 3 for holding the sieving face, a hanging shaft 31 pivoting the tip end of the swinging arm 32, and a vibrating apparatus 15, and the sieving face 2 is swung and vibrated around the hanging shaft 31. Since the sieving face has an arc-like shape and is swung and vibrated around the handing shaft, the supporting structure of the sieving face can be simplified and tough, and wear in the sliding face by earth and sand and operation failure can be prevented. In order to further improve the sieving capability, the portion of the sieving face 2 in the front side of the bucket is vibrated in the plane direction and in the perpendicular direction to the plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket with a sieving device for sieving earth and sand in the bucket by vibrating a sieving surface provided on a bucket attached to the tip of an arm of a power shovel with a vibrating device. Is.

[0002]

2. Description of the Related Art Conventionally, as this type of vibrating bucket, there is known a structure in which a flat sieving surface is provided at the bottom of the bucket and the sieving surface is reciprocally oscillated in the surface direction.

As another structure, the bucket is formed by a sieving surface having an all-cylindrical shape, and the sieving surface of the cylinder is rotatably supported by a bracket attached to the tip of the arm of the power shovel, and the sieving surface of the cylindrical sieving surface is rotated. A structure has been proposed in which an excavation claw is provided at a part of the open end on the non-supporting side and the earth and sand put into a bucket is sieved by rotating a cylindrical sieving surface.

Further, there is also known a bucket with a sieving device in which a sieving surface having a front edge pivotally attached to a bottom surface of the bucket is vibrated in a vertical direction by a vibrating device.

[0005]

A bucket in which a bottom surface of a bucket frame is provided with a flat sieving surface that vibrates in a plane direction or in a direction perpendicular to the plane, has a smaller sieving surface area than the capacity of the bucket. There is a problem that work efficiency is not good. Also, the one that vibrates the sieving surface in the plane direction is
It is necessary to slidably support the sieving frame that holds the sieving surface, and problems such as the smoothness of operation being impaired and the sliding surface becoming worn due to the intrusion of earth and sand into the sliding surface. there were. Even if it vibrates in a direction perpendicular to the plane, there is a problem of abrasion of the pivot shaft due to intrusion of sediment, and simply moving the sieve surface up and down will not cause the soil to roll on the sieve surface, so the sieving performance will be improved. There was a problem of being low.

On the other hand, a bucket provided with a rotating cylindrical sieving surface can have a large sieving surface, but the structure is very complicated and large, and it is difficult to increase the strength of the bucket itself and its shaft supporting portion. However, it has a drawback that it is not durable enough for severe earthmoving work and is structurally complicated and large.

In view of the above, the present invention provides a support structure for a sieving surface in a bucket with a sieving device which is attached to the tip of an arm of a power shovel for excavating and sieving earth and sand and which does not cause wear or malfunction due to intrusion of earth and sand. It is an object of the present invention to provide a bucket with a sieving device that has a smooth sieving operation, high durability, and excellent sieving performance.

[0008]

A bucket with a sieving device for a power shovel according to claim 1 of the present application, which has solved the above-mentioned problems, is arranged at the bottom of the bucket to form an arcuate curved surface in the front-rear direction of the bucket. The sieving surface 2, the swinging arm 32 extending upward from the arc-shaped edge of the sieving frame 3 that holds this sieving surface, and the bucket frame 4 forming the tip of this swinging arm and the outer peripheral portion of the bucket. Pivoting suspension shaft 3
1 and a vibrating device 15 mounted on the bucket frame 4 and connected to the sieving frame 3, and the sieving surface oscillates and oscillates about the suspension shaft.

A bucket with a sieving device for a power shovel according to claim 2 is provided with a sieving surface 2 at the bottom of a bucket frame 4 having a bracket 20 connected to the tip of the arm of the power shovel, and a sieving frame for holding this sieving surface. 3 is supported by the bucket frame 4 so as to be reciprocally movable in one direction, and is provided with a vibrating device 15 that reciprocally vibrates the sieving frame 3 in the one direction. The sieving surface 2 is an arcuate curved surface in the bucket front-back direction. The bucket frame 4 is provided with suspension shafts 31 on the upper portions of both side surfaces, the sieve frame 3 is suspended and supported on the suspension shafts, and a vibration device 15 is provided at the end of the bucket frame 4 on the side of connection to the arm. The oscillating device reciprocally swings the sieving frame 3 around the suspension shaft 31.

In the bucket with a sieving device of the present invention described above, since the sieving surface is an arcuate curved surface in the front-back direction of the bucket, the shape of the bottom surface of the bucket can be the shape of a normal bucket for excavation work, and the operation at the time of excavation can be performed. A vibrating bucket having excellent properties can be obtained.

The arcuate curved surface in the front-rear direction of the bucket mentioned here is, for example, a partial cylindrical surface having a central axis parallel to the swing central axis 23 of the excavating operation of the bucket, and the radius of curvature is continuous from the rear to the front. Alternatively, a curved surface that changes stepwise, a surface that has a rear surface as a partial cylindrical surface and a front surface that is a tangential plane, and a polygonal surface that approximates these curved surfaces.

In the bucket with the sieving device of the present invention, the sieving surface is supported by the suspension shaft 31 located above the bucket and oscillates and oscillates around the suspension shaft, so that the supporting structure of the sieving surface is simple. Thus, it is possible to obtain a bucket with a sieving device that is stable and does not cause abrasion or malfunction of the sliding surface due to the influence of earth and sand.

If a hydraulic cylinder directly connected to the sieving frame 3 or connected via the links 17 and 19 is used as the vibrating device 15, the drive structure can be simplified and downsized, and the overall weight of the bucket can be reduced. Further, since the cylinder is driven, abrupt acceleration / deceleration occurs at the stroke end, that is, when the moving direction of the sieving surface 2 changes, and the movement of the earth and sand on the sieving surface increases, so that the sieving ability is improved. Further, the telescopic rod of the hydraulic cylinder 15 is connected to the lever link 17
By adopting the structure in which it is connected to the sieving frame 3 via, the vibration stroke of the sieving surface 2 can be easily changed by replacing the lever link 17.

Since the bucket with a sieving device of the present invention is provided with the arcuate sieving surface, the area of the sieving surface can be increased, and the arcuate sieving surface can be reciprocally oscillated in the arc direction. , The soil on the sieving surface rolls on the sloping sieving surface at the moving end of the reciprocating movement, and the rolling movement on the sieving surface of stones and earth and sand is promoted to provide a flat sieving surface. The sieving ability is greatly improved in comparison with the ones.

In order to increase the rolling or movement of the earth and sand on the sieving surface and further improve the sieving performance, the suspension shaft 31
It is preferable to adopt a structure in which the portion of the sieving surface 2 on the front side of the bucket is vibrated in the surface direction and the direction perpendicular to the surface by the swing vibration around the surface.

This is easy, for example, by arranging the suspension shaft 31 at a position below the arc center axis on the surface including the arc center axis of the arc-shaped sieving surface 2 and the rear edge of the sieving frame 3. Can be realized. Further, the radius of curvature Rf of the bucket front side portion of the arcuate sieving surface 2 is made larger than the radius of curvature Rr of the back side portion of the sieving surface, and the suspension shaft 31 is located at a substantially arcuate center position of the inner sieving surface. It can also be realized by providing the above. The structure in which the front portion of the bucket is a flat surface corresponds to an infinite radius of curvature Rf.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the examples shown in the drawings. 1 and 2 are
It is the figure which showed the 1st Example of this invention. FIG. 1 is a vertical cross-sectional view of a bucket. As shown in the figure, the bottom surface of the bucket 1 is a partially cylindrical surface, and this bottom surface is a sieving surface 2 having a large number of through holes such as wire mesh and punching metal. There is. The sieving surface is supported by a sieving frame 3 whose both sides are arcuate and whose front and rear edges are straight. If necessary, a crosspiece for supporting the sieving surface can be provided on this sieving frame.

A bucket frame 4 is formed around the periphery of the bucket except for the bottom surface, and the bucket frame is provided with two side plates 5 and 5, an inner plate 6 and an excavation edge 7 which are integrated by welding or the like. And a front plate 8. The lower edge of the side plate 5 has an arc shape, and a suspension shaft 31 protruding inward is erected in the upper portion thereof. Swing arms 32 extending upward are integrally provided on both side surfaces of the sieving frame 3, and the upper ends of the swing arms 32 are pivotally attached to the suspension shaft 31. The suspension shaft 31 includes a cylindrical central axis 33 of the partially cylindrical sieving surface 2 and the sieving frame 3.
It is located below the central axis 33 on the surface including the rear edge 3a.

By providing the suspension shaft 31 at this position, when the sieving surface 2 swings around the suspension shaft 31, the trailing edge side reciprocally swings substantially in parallel with the sieving surface, and the front edge side of the sieving surface. Since the arc 35 centering on the suspension shaft 31 intersects the sieving surface 2 at an angle, the front part of the sieving surface vibrates in the plane direction and the plane orthogonal direction.

When a vibration component perpendicular to the surface of the sieving surface 2 is applied to the front portion of the sieving surface 2 in this manner, when the sieving surface 2 vibrates, the earth and sand located in the front portion of the sieving frame is flipped up. As a result, a motion of falling on the sieving surface and a motion of rolling on the sieving surface due to vibration in the surface direction of the sieving surface are carried out, so movement including inverting the upper and lower layers on the sieving surface 2 is universal. It is possible to realize efficient sieving operation.

The front plate 8 of the bucket frame has an inner plate 8a and an outer plate 8b.
And the front edges of both plates 8a and 8b are integrated to form the excavation edge 7.

A cylinder chamber 13 is provided on the rear side of the back plate 6, and the tip end of the telescopic rod 16 of the hydraulic cylinder 15 having the head end pivotally attached to the bucket frame 4 by the trunnion structure has the base end of the back plate 6. It is connected to an intermediate portion of a lever link 17 pivotally attached to the back surface. The lever links 17 are provided on the left and right as shown in FIG. 2, and the tip of the telescopic rod 16 is pivotally attached to the center of the connecting bar 18 connecting the middle of the left and right lever links. The tip of each lever link is pivotally connected to the rear edge 3a of the sieving frame 3 via a connecting link 19.

On the rear surface of the cylinder chamber 13, the bracket 2
No. 0 is welded to the bracket, and the bucket is attached to the bracket with the tip 21a of the arm 21 of the power shovel and the front link 2
A pin hole is provided through which the connecting pins 23 and 24 pivotally attached to the tip of 2 are inserted.

In the first embodiment, the arm 21 and the front link 22 are operated to excavate or scoop up the earth and sand, and then the sieving surface 2 is vibrated by the hydraulic cylinder 15 to perform the sieving operation. The sieving surface 2 swings back and forth around the suspension shaft 31. The stroke on the sieving surface is 20-40 mm.

FIG. 3 shows a second embodiment of the present invention. In the sieving surface 2 of the second embodiment, the front part thereof is a plane (curvature radius Rf is infinite) and the rear part is a partial cylindrical shape having a radius of curvature Rr (finite value), and the suspension shaft 31 is of the rear part. It is located at the center of the arc of the sieving surface. The radius of curvature of the sieving surface 2 may be continuously changed from Rr to Rf, or may be changed stepwise at an appropriate place. By forming the sieving surface into such a partially cylindrical curved surface, it is possible to obtain a sieving surface that matches various shapes of the bottom surface of the bucket.

Since the suspension shaft 31 is located at the center of the arc of the rear part of the sieving surface 2, the rear part of the sieving surface vibrates in the surface direction, and the front part having a radius of curvature larger than Rr has its sieving surface. Since the surface obliquely intersects the circular arc 35 centered on the suspension shaft 31, vibration is imparted in the surface direction and the surface-perpendicular direction, as in the case of the first embodiment, and thus is similar to that of the first embodiment. Moreover, the movement of the earth and sand on the sieving surface 2 is evenly performed, and good sieving performance is exhibited.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a bucket according to a first embodiment.

FIG. 2 is a transverse cross-sectional view of the bucket of the first embodiment (viewed from the arrow AA).

FIG. 3 is a vertical sectional view of a bucket according to a second embodiment.

[Explanation of symbols]

2 sieving surface 3 sieve frames 4 bucket frame 15 hydraulic cylinder 20 bracket 23 Swing center axis 31 Suspended shaft 32 swinging arms Rf radius of curvature (infinity) Rr radius of curvature

Claims (5)

[Claims] 1. A sieving surface arranged at the bottom of a bucket, a sieving frame that holds this sieving surface, and a bucket frame that forms the outer peripheral portion of the bucket and is connected to the sieving frame. In a bucket with a sieving device for a power shovel equipped with a vibrating device (15), the sieving surface forming an arcuate curved surface in the front-back direction of the bucket.
(2), a swing arm (32) extending upward from the arc-shaped edge of the sieve frame (3), the tip of the swing arm and the bucket frame (4)
A bucket with a sieving device, comprising: the suspension shaft (31) in the axial direction pivotally attached to the sieving surface, and the sieving surface oscillates about the suspension shaft. 2. A sieving surface (2) is provided at the bottom of a bucket frame (4) having a bracket (20) connected to the arm tip of a power shovel, and a sieving frame (3) holding this sieving surface is the bucket. In a bucket with a sieving device of a power shovel, which is supported by a frame so as to be reciprocally movable in one direction and equipped with a vibrating device (15) for reciprocally vibrating the sieving frame in the one direction, the sieving surface (2) is the front and rear of the bucket. Direction is an arcuate curved surface, the bucket frame is provided with suspension shafts (31) at the upper portions of both side surfaces, and the screen frame is suspended and supported by the suspension shaft, and the bucket frame is connected to the arm. Vibrating device at the end (15)
A bucket with a sieving device for a power shovel, characterized in that the vibrating device reciprocally swings the sieving frame (3) around the suspension shaft. 3. The sieving device according to claim 1, wherein the oscillating vibration around the suspension shaft vibrates the sieving surface on the front side of the bucket in a plane direction and a direction perpendicular to the plane. bucket. 4. The suspension shaft according to claim 3, wherein the suspension shaft is arranged at a position lower than the circular arc central axis on a surface including a substantially circular arc central axis of the sieving surface and a rear edge of the sieving frame. Bucket with sieving device. 5. The radius of curvature (Rf) of the bucket front side portion of the sieving surface is larger than the curvature radius (Rr) of the back side portion of the sieving surface, and the suspension shaft is substantially the same as the back side sieving surface. The bucket with a sieving device according to claim 3, which is provided at a center position of the arc.