JPH1018335A - Bucket for power shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bucket for a power shovel suitable for both works of disassembling and civil engineering by arranging a cover part besides a bucket main body part suitable for civil engineering work, and also performing opening- closing operation suitable for disassembling work. SOLUTION: When hydraulic cylinders 2a and 3a are extended and contracted without rotating a hydraulic motor, a bucket 50 moves by drawing a circular arc-shaped locus in a perpendicular plane according to a swing of a boom 30 and an arm 4, and the bucket 50 opens and closes like scissors by extension- contraction of a hydraulic cylinder 4a. It performs sandwiching-crushing operation by sandwiching a processing object such as a scrap material between a bucket main body part 51 and a cover part 52. After necessary disassembling work, the hydraulic cylinders 2a and 3a are similarly operated in a condition where the cover part 52 is opened, and the bucket main body part 51 makes a movement close to a conventional civil engineering bucket. In this way, civil engineering work is performed, and while the bucket 50 is installed as it is, disassembling work and civil engineering work can be successively-continuously or properly mixedly performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket for a power shovel, and more particularly to not only a direct dismantling operation but also a related operation such as clearing of dismantled materials, and a subsequent civil engineering operation such as leveling and excavation. Also relates to a suitable bucket for a power shovel. In this specification, a power shovel is used in a broad sense including a backhoe and so-called yumbo.

[0002]

2. Description of the Related Art In a conventional power shovel shown in FIG. 8A, a boom 3, an arm 4, and a bucket 5 are connected to a rotatable body 2 on a traveling unit 1 in order. The hydraulic cylinder 2a connected to the body 2 and the boom 3 expands and contracts, so that the boom 3 swings in a vertical plane with the base end on the body 2 side as a fulcrum.
The arm 4 swings in the same vertical plane from the tip of the boom 3 by the expansion and contraction of a hydraulic cylinder 3a connected to the arm 4 and the bucket 5, and the bucket 5 also swings by the expansion and contraction of the hydraulic cylinder 4a. ing.

There are various types of buckets 5 that can be mounted on the tip of the arm 4 of the power shovel according to the work. The general box-shaped bucket shown in FIG. 8B is suitable for ordinary civil engineering work and the like. On the other hand, the thing like a bird's foot shown in FIG. 8C can be pinched and crushed, and is suitable for dismantling work. Therefore, when performing work such as dismantling of a house and subsequent leveling, first, a bucket for dismantling (FIG. 8).
(C)) is mounted on the arm 4 to perform the demolition work, and then the demolition bucket is removed, and instead, a civil engineering bucket (FIG. 8B) is mounted, and then the ground leveling work is performed.

[0004]

However, in such a conventional bucket for a power shovel, since the application work of the bucket is limited, when the civil work is performed after the dismantling work or during the civil work. In the case where a partial demolition work is also performed, the work must be interrupted and the bucket must be replaced. Moreover, this replacement usually takes 30 minutes.
It takes from a minute to an hour. For this reason, work such as dismantling was suspended during that time. Therefore, by devising the structure of the excavator bucket, a bucket that can easily perform both demolition work and civil engineering work without performing bucket replacement is devised. The challenge is to improve work efficiency.

The present invention has been made to solve such a problem, and has as its object to realize a power shovel bucket suitable for both demolition and civil engineering work.

[0006]

Means for Solving the Problems First to third solving means invented to solve such problems are as follows.
The configuration and operation and effect will be described below.

[First Solution] A power shovel bucket according to a first solution (as described in claim 1 at the beginning of the application) is a power shovel bucket mounted on an end of an arm of the power shovel. A bucket body (such as a box-shaped body) having an opening, and a cover that can be opened and closed (partly or entirely) with respect to the opening. It is.

In the bucket for a power shovel according to the first solution, if the cover is opened with respect to the opening, the opening of the bucket body is used as an opening for the object to be processed, and the bucket main body is made to be a conventional one. Performs the same function as a civil engineering bucket. In addition, if the cover is opened and closed with respect to the opening, the bucket for disassembly, such as holding the object to be processed in the opening portion by separating the bucket body and the cover at this time, and further crushing and crushing. It performs the same function as (dismantling unit). Moreover, both of these functions are exhibited by the same bucket.

Thus, the demolition work and the civil engineering work can be continuously performed without performing the bucket exchange. Therefore, according to the present invention, a power shovel bucket suitable for both demolition and civil engineering work can be realized.

[Second Solution] The power shovel bucket according to the second solution (as described in claim 2 at the beginning of the application) is the power shovel bucket according to the first solution. The cover is movable along the arm (from the distal end to the proximal end and in the opposite direction).

In the power shovel bucket according to the second solution, the cover may be moved along the arm so that the cover is separated from the bucket body and the opening thereof. is there. Then, if the civil engineering work is performed using the bucket main body portion in such a state, the cover portion does not interfere.

[0012] Thus, the civil engineering work can be easily performed regardless of whether the cover portion is provided. Therefore, according to the present invention, it is possible to realize a power shovel bucket suitable for civil engineering work even if it is also used for demolition.

[Third Solution] A bucket for a power shovel according to a third solution (as described in claim 3 at the beginning of the application) is the bucket for a power shovel according to the first or second solution. And one or both of the bucket body and the cover are provided with a blade or a projection at the opening.

In the bucket for a power shovel according to the third solution, even if the object to be processed is difficult to cut or crush, the bucket body and the cover are connected to each other by applying the object to a blade or the like. It can be cut or crushed by being sandwiched between. Thereby, work such as dismantling can be performed easily and quickly.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment for implementing a power shovel bucket of the present invention achieved by such a solution will be described.

[First Embodiment] A first embodiment of the present invention is a power shovel bucket according to the above-mentioned solving means, comprising a first gear (drive gear) fixed to the bucket body. And a second gear (a driven gear) fixed to a portion on the cover that establishes a transmission state with the first gear when the cover moves toward the distal end of the arm. Features.

Generally, a power shovel is provided with a drive mechanism for swinging a bucket with respect to an arm and a hydraulic drive source. However, in the power shovel bucket of such an embodiment, the bucket is closed when gears are transmitted to each other. When the main body is swung, the first gear is operated at the same time, and the second gear is operated accordingly. Then, the cover portion swings together with the second gear. Therefore, when the bucket body is swung, the cover opens and closes with respect to the bucket body.

Thus, the existing bucket swing drive mechanism and the hydraulic drive source can also be used for driving the opening and closing operation of the cover. Therefore, the functional enhancement can be achieved without adding a high-cost hydraulic drive source or with a small increase.

[Second Embodiment] A second embodiment of the present invention is the bucket for a power shovel according to the above-described solving means or the embodiment, wherein the blade is provided at both right and left ends, and the protrusion is provided. Is characterized by being provided substantially at the center. As a result, concrete or the like is crushed by the protrusions,
Furthermore, since the rebar can be cut with a blade, the efficiency of dismantling work is improved.

[Third Embodiment] In a third embodiment of the present invention, the bucket for a power shovel of the above-mentioned solution or embodiment is mounted on the tip end of an arm and is swingable with respect to the body. A power shovel that swingably supports the arm by a boom attached to the body, wherein the boom is coaxially or parallelly supported by the first beam portion on the body side and the first beam portion. A second beam portion on the arm side, wherein the second beam portion is bidirectionally rotatable around an axis (a predetermined angle or an arbitrary angle) using the first beam portion as a base. .

In the power shovel of such an embodiment, the boom, which has conventionally been a single beam, is constituted by two relatively rotatable beams. Therefore, when it is desired to pinch a standing pillar with a bucket, the beams are first appropriately rotated, and then the arm is swung.
Then, the bucket moves in a plane such as a horizontal plane or an inclined plane. Thus, it is possible to easily perform the processing from the side even when the body such as the driver's seat is fixed. Therefore,
According to this embodiment, it is possible to realize a power shovel having an operation mode suitable for operations such as crushing and gripping from the side.

[Fourth Embodiment] A fourth embodiment of the present invention is a power shovel of the above embodiment,
The second beam is movable relative to the first beam in the axial direction. By making the boom extendable and contractible in this manner, the processing range of the bucket is widened by the amount of extension. In addition, since the boom is rotatable and extendable, the bucket at the arm end can move linearly in the inclined plane, so that advanced operations such as picking up an object from a gap such as a small window can be easily performed. be able to.

[Fifth Embodiment] A fifth embodiment of the present invention is the power shovel of the above embodiment,
The first and second beam portions are formed using an outer cylinder and an inner cylinder or an inner rod, and are slidably fitted. As a result, while maintaining the rigidity required to support the bucket that lifts the dismantled object to the front with a compact size that is almost the same size as the conventional boom,
The boom can be rotatable and extendable.

[Sixth Embodiment] A sixth embodiment of the present invention is the power shovel of the above-described embodiment,
An annular joint having an annular oil passage formed therein is provided. The annular joint may be used as a part of the first beam portion (or may be fixed to the first beam portion or mounted movably within a limited range, etc.) The movement is controlled by the first fluid inflow / outflow part whose movement is regulated by ()) and the second beam part (which also serves as a part of the second beam part or is fixed to the second beam part or movably mounted in a limited range). And a regulated second fluid inflow / outflow portion.

Thus, even when the boom is rotated for turning the bucket sideways or the like, the oil passage such as the hydraulic pipe on the body or the first beam side is connected to the first fluid inflow / outflow portion, Through the annular oil passage in the annular joint and the second fluid inflow / outflow portion in sequence, it is possible to always maintain a communication state with an oil passage such as a hydraulic pipe on the side of the arm or the second beam portion. Therefore, the means for reliably supplying the driving oil pressure such as the arm can be realized with a simple structure.

[0026]

【Example】

[First Embodiment] As a first embodiment of a bucket for a power shovel of the present invention, a specific configuration of a power shovel in which the bucket is attached to the tip of an arm will be described with reference to the drawings. FIG. 1 is a schematic view of the structure of the entirety and a bucket portion, FIG. 2 is a modified example of a link of a bucket, and FIG. 3 is a detailed view of a bucket body. In addition, FIG.
It is a detailed view of a boom of a power shovel.

The power shovel shown in FIG. 1A is obtained by replacing the bucket 5 in FIG. 8 of the conventional example with a new bucket 50. The boom 3 in FIG. 8 has also been replaced with a new boom 30. Therefore,
The structure of the bucket 50 for both dismantling and civil engineering will be described in detail below.
Thereafter, the structure of the rotatable and extendable boom 30 will be described.

The bucket 50 shown in FIGS. 1 (b) and 1 (c)
Is composed of a bucket body 51 and a cover 52. The bucket body 51 has substantially the same structure as the conventional bucket 5. That is, in order to store the processing object such as earth and sand, it has a large open box shape, and swings by the expansion and contraction of the hydraulic cylinder 4a to put the processing object in and out. The base end is pivotally supported by the tip of the arm 4. However, the left and right sides of the opening are reinforced so that they can withstand operations such as pinching and crushing, which will be described later, and the shaft support at the base end has been changed to coaxially support the next cover 52 as well. It has become something.

The cover 52 has a shape like a tooth of a fork or a thick comb, and the size corresponds to the opening of the bucket body 51. The cover 53 and the hydraulic cylinder 4a are connected by a link 53 such that the base end is pivotally supported by the distal end of the arm 4 together with the bucket main body 51, and swings in the opposite direction to the bucket main body 51 by expansion and contraction of the hydraulic cylinder 4a. Have been. Thus, when the hydraulic cylinder 4a is expanded and contracted, the distal ends of the bucket body 51 and the cover 52 are separated from each other, and the opening of the bucket body 51 is opened and closed.

In the bucket 50 shown in FIG. 2, the link 54 between the bucket body 51 and the arm 4 is integrally formed of a steel plate to improve the strength and rigidity.
Moreover, since the hydraulic cylinder 530 is disposed at the link 53, the swing of the bucket body 51 and the cover 52
Opening and closing operations can be performed independently. The bucket main body 51 shown in an enlarged scale in FIG. 3 has a large number of through holes 51a formed at the bottom so that fine earth and sand and dust unnecessary to carry out can be sieved out.

The boom 30 shown in FIG. 4 has an inner cylinder 31 (first beam portion) having a proximal end connected to the body 2 and the hydraulic cylinder 2a and having at least a distal end formed in a cylindrical shape, and an end on the inner cylinder 31 side. An outer cylinder 33 (second beam portion) having a special joint 32 mounted thereon and a boom tip 36 mounted at an end on the arm 4 connection side. The outer diameter of the inner cylinder 31 is slightly smaller than the inner diameter of the outer cylinder 33. And both cylinders 31, 33
Are fitted and are relatively movable.

In the inner cylinder 31, a hydraulic motor 37 is disposed in the inner cavity in order along the central axis, a large-diameter gear 34 is provided on the front end surface, and a hydraulic cylinder 35 is provided concentrically ahead of the gear 34. Have been. When a drive hydraulic pressure is supplied by operating a corresponding hydraulic control valve (not shown), the hydraulic motor 37 rotates, and the gear 34 also rotates.

The outer cylinder 33 has an inner peripheral surface on which inner teeth for engaging with the gear 34 are cut. The internal teeth are formed to be long in the axial direction, and can always maintain the meshing state with the gear 34 even when there is an axial relative movement between the inner cylinder 31 and the outer cylinder 33. When the hydraulic motor 37 is operated, the outer cylinder 33 slides in the circumferential direction with respect to the inner cylinder 31 and rotates. Prior to attaching the boom tip 36 to the outer cylinder 33, the other end of the hydraulic cylinder 35, one end of which is connected to the gear 34, is connected to the center of the inner surface of the boom tip 36. Let it be. Thus, the outer cylinder 33 slides in the axial direction with respect to the inner cylinder 31 by expanding and contracting the hydraulic cylinder 35 by operating a corresponding hydraulic control valve (not shown).

Although not shown in detail, the special joint 32 is formed in an annular shape, and has a rotating body that is fixedly mounted on the outer peripheral surface of the outer cylinder 33 at the end on the insertion side of the inner cylinder 31 and rotates together with the outer cylinder 33. And a non-rotating body mounted on the outer peripheral side of the rotating body so as to be slidable in the circumferential direction. An end plate for restricting axial movement of the non-rotating body with respect to the rotating body is attached to an end surface of the non-rotating body on the side of the inner cylinder 31. It is protruding. And
At the time of assembling, the tip of the key is loosely inserted into a guide groove that is carved in the axial direction on the outer peripheral surface of the inner cylinder 31. Thus, the relative movement of the non-rotating body in the circumferential direction is restricted by the inner cylinder 31.

An annular groove is formed on the outer periphery of the rotating body, and the opening surface of the groove is closed by a non-rotating body so that an annular oil passage is formed inside. . Usually, a plurality of annular oil passages are provided, each having about 10 passages, each of which is separated by an oil seal and is independent from each other. Further, for each of the annular oil passages, a through-hole for connecting the corresponding hydraulic hose 38 is formed in the non-rotating body (first fluid inflow / outlet portion), and the corresponding hydraulic hose 38 is formed in the rotating body from the bottom of the annular oil passage. A drill hole communicating with 39 is dug (second fluid inflow / outflow portion). And each hydraulic hose 39
After reaching the boom tip 36 along the outer surface of the outer cylinder 33,
The driving fluid is supplied to the hydraulic cylinder 35, the hydraulic cylinders 3a, 4a, and the like.

The usage and operation of a power shovel equipped with a bucket or the like having such a structure will be described.

When performing dismantling work using this power shovel, first, the hydraulic motor 37 is not rotated, and the hydraulic cylinder 35 is contracted to keep the boom 30 in the same state as the conventional boom 3. Then, the operation of the hydraulic control valve and the like is performed in the same manner as when the conventional bucket for dismantling (FIG. 8C) is attached. Then, the hydraulic cylinders 2a and 3a expand and contract, and the bucket 50 moves along a circular locus in a vertical plane as the boom 30 and the arm 4 swing.
Also, the hydraulic cylinder 4a expands and contracts, and the bucket 50
Open and close like scissors. That is, the bucket 50 operates similarly to the conventional bucket for dismantling.

Therefore, the object to be treated such as waste material is sandwiched between the bucket body 51 and the cover 52 to perform a pinching and crushing operation, so that the dismantling operation is performed. At this time, the crushed processed material is immediately stored in the bucket 50, and thus may be transported to a truck or the like and loaded. Also,
Unnecessary earth and sand or dust that has arrived at the waste material is passed through the through-hole 51a.
Therefore, loading onto a truck or the like is avoided without performing a sorting operation. Thus, the dismantling operation is performed more efficiently than in the past. The amount of waste is small.

After the disassembly operation is completed, the operation of the hydraulic control valve and the like is performed in a state where the cover 52 is opened, in substantially the same manner as when the conventional civil engineering bucket 5 (FIG. 8B) is mounted. Then, the hydraulic cylinders 2a and 3a expand and contract, and the bucket 50
Moves along a circular locus in a vertical plane with the swing of the boom 30 and the arm 4. Then, the bucket body 51 moves close to a conventional civil engineering bucket. Thus, civil works can also be performed. Moreover,
While the bucket 50 is mounted, the demolition work and the civil engineering work can be performed continuously, continuously, or appropriately interwoven.

In such a work, if it is desired to process a previously unreachable object at a place with a poor scaffold, the corresponding hydraulic control valve is first operated to extend the hydraulic cylinder 35. Then, the same operation as described above is performed. Then, the bucket 50 becomes the boom 3
The robot moves along a large arc-shaped locus in a vertical plane with the swing of the arm 0 and the arm 4. In this way, both demolition and civil engineering work can be performed over a wide area comparable to a large excavator.

If the driver wants to grab waste material or the like from the side with the bucket 50 without moving the body 2 equipped with the cab in which the driver enters, first the corresponding hydraulic control valve is operated to turn the hydraulic motor 37 at a predetermined angle. For example, rotate 90 °. Thus, the arm 4 and the bucket 50 are turned sideways. Then, the boom 30 is moved by the extension / contraction operation of the hydraulic cylinder 2a.
Is swung to adjust the height of the bucket 50 and the like, and then the hydraulic cylinders 3a and 4a are further expanded and contracted. Then,
The bucket 50 moves along an arc-shaped trajectory in a horizontal plane with the swing of the arm 4, and sandwiches the target object.
In this way, the operation for performing the operation from the side can be easily performed with the gaze fixed.

Further, when it is desired to sew a gap such as a roof or a pillar and to process an object inside from an oblique direction, the traveling unit 1 is first operated to move to a position slightly away from the gap. Further, the body 50 is swung, the boom 30 is swung, and the like, and the bucket 50 and the arm 4 are inserted into the front portion of the gap. Then, the hydraulic cylinder 35 is extended. Then, the boom 30 extends straight,
Since the bucket 50 reaches the object to be processed, it is sandwiched and taken out. In this way, it is possible to easily process the objects inside from the gap.

[Second Embodiment] A second embodiment of a power shovel bucket according to the present invention shown in FIG.
Are formed separately from the cover part 52 and are indirectly mounted not on the cover part 52 but on the arm 4. The cover part 52 is attached to a slider 55b that reciprocates in the axial direction of the arm 4 due to the expansion and contraction of a hydraulic cylinder 55a attached to the arm 4, whereby the cover part 52 can move along the arm 4. ing.

A gear 55c (drive gear) is provided at a support shaft portion on the base end side of the cover 52, and a gear 55c corresponding to the support shaft portion on the base end side of the bucket body 51 is provided.
d (driven gear) is provided, and when the cover portion 52 moves to a position covering the opening of the bucket body portion 51, the two gears 55c and 55d mesh with each other. Gear 5
5c is fixed to the cover 52, and the gear 55d is fixed to the bucket body 51. When the hydraulic cylinder 4a is expanded and contracted at the time of meshing, the bucket body 51 and the cover 52 open and close. It has become.

When performing demolition and civil engineering work using such a power shovel bucket, the hydraulic cylinder 5
The disassembly operation is performed with the 5a extended and the gears 55c and 55d meshed with each other. Thus, the dismantling operation can be performed in the same manner as described above. On the other hand, when moving to civil engineering work, the hydraulic cylinder 55a is contracted, and the cover 52 is pulled up to the base end side of the arm 4. then,
Perform civil engineering work. At this time, only the bucket body 51 is operated depending on the expansion and contraction of the hydraulic cylinder 4a. Therefore, it is possible to completely ignore the existence of the cover 52 and complete the civil work with the same feeling as a conventional civil bucket.

Third Embodiment A third embodiment of a bucket for a power shovel according to the present invention shown in FIG. 6 uses cutters 56 on the left and right sides of an opening of a bucket body 51 for cutting a reinforcing bar.
a, and a cutter 56b is attached to the cover portion 52 so as to face this. Cutter 56a
Is formed so that the blade portion faces the base end side as much as possible so that the blade does not spill when scooping earth and sand or the like from the distal end side of the bucket body portion 51. Further, the blade portion is formed so as to be curved so as not to escape while sandwiching the reinforcing bar at the time of cutting. By using such a bucket for a power shovel, a building made of reinforced concrete can be easily and quickly dismantled. From the viewpoint of enhancing the cutting force, it is desirable that the cutters 56a and 56b are arranged near the connecting shaft between the bucket body 51 and the cover 52.

Fourth Embodiment A fourth embodiment of a bucket for a power shovel according to the present invention shown in FIG. 7 has a saw 57 attached to the outer surface of a bucket body 51 for cutting trees and the like. It is. The saw 57 is configured such that the teeth of the chain arrangement are driven by the motor (M), and the saw 57 is also rotated gently as a whole. The saw 57 may be attached to the cover 52.

When the tree is to be processed, first, the boom 30 is rotated so that the bucket 50 and the arm 4 are turned sideways so that the saw 57 is positioned below the bucket body 51. Next, the bucket body 51 and the cover 52
And sandwich the target tree. Then, the saw 57 is operated. Then, the tree is cut as the saw 57 rotates. Moreover, the cut standing trees are sandwiched between the buckets, so that they do not have to worry about falling down and can be cleared immediately.
Thus, by cooperating the power shovel bucket and the boom 30 in this example, standing trees, standing columns, and the like can be easily cleared.

[0049]

As is apparent from the above description, in the bucket for power shovel according to the first solution of the present invention, the cover is provided in addition to the bucket body suitable for civil engineering work, and the demolition work is performed. Has an advantageous effect that a power shovel bucket suitable for both demolition and civil engineering work can be realized.

Further, in the power shovel bucket according to the second solution of the present invention, the cover portion can be evacuated and moved to a place where it does not hinder civil works, so that it can be used for both dismantling. There is an advantageous effect that a power shovel bucket suitable for civil engineering work can be realized.

Further, in the power shovel bucket according to the third solving means of the present invention, since the blade for cutting and crushing is also provided, the work such as dismantling can be performed easily and quickly. This has the advantageous effect of having come to be.

[Brief description of the drawings]

FIG. 1 shows a power shovel bucket and a power shovel equipped with the same according to a first embodiment of the present invention.
It is the structure schematic diagram.

FIG. 2 is a modified example of the link of the bucket.

FIG. 3 is a detailed view of the bucket body.

FIG. 4 is a detailed view of a boom of the power shovel.

FIG. 5 is a second embodiment of a bucket for a power shovel according to the present invention.

FIG. 6 is a third embodiment of a bucket for a power shovel according to the present invention.

FIG. 7 is a fourth embodiment of a bucket for a power shovel according to the present invention.

FIG. 8 shows a conventional power shovel and its bucket.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Running part (foot circumference; leg; moving base) 2 Body (vehicle body; turning base) 2a Hydraulic cylinder 3 Boom (first cantilever) 3a Hydraulic cylinder 4 Arm (second cantilever) 4a Hydraulic cylinder 5 Bucket 30 boom (first cantilever) 31 inner cylinder (inner rod; body-side unit; swing base; first beam) 32 special joint (annular joint) 33 outer cylinder (outer jacket; arm-side unit; movable body) Second
Beam part) 34 Gear (gear) 35 Hydraulic cylinder 36 Boom tip (Second beam part) 37 Hydraulic motor 38, 39 Hydraulic hose (Hydraulic piping) 50 Bucket (Excavator; Crusher; Gripper; Civil demolition actuator) 51 bucket body 51a through hole (mesh; net; sieve) 52 cover 53, 54 link 55a hydraulic cylinder 55b slider 55c gear (drive gear; direct transmission mechanism) 55d gear (driven gear; direct transmission mechanism) 56a, 56b cutter 57 saw

Claims (3)

[Claims] 1. A bucket for a power shovel mounted on an end of an arm of a power shovel, comprising: a bucket body having an opening; and a cover capable of being opened and closed by being separated from the opening. A bucket for a power shovel, characterized in that: 2. The power shovel according to claim 1, wherein said cover portion is movable along said arm. 3. The power according to claim 1, wherein one or both of the bucket body and the cover have a blade or a projection provided at the opening. Excavator.