JPH08311916A - Bucket for excavation operating car - Google Patents

Abstract

PURPOSE: To provide a bucket capable of easily crush very hard substance such as concrete floor, etc. CONSTITUTION: When a vibration member 94 inserted in a casing 95 fixed to the inside of a bucket 19 and a crushing tool 96 connected thereto are vibrated with a vibration generating device in a state to thrust them into concrete floor, etc., the crushing tool 96 is repeatedly thrown against the concrete floor, etc., roughly vertically. At that time, since the crushing tool 96 is one piece and is projected from bucket teeth 27, the concrete floor is easily crushed therewith.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket rotatably connected to an arm tip of an excavation work vehicle such as a hydraulic excavator.

[0002]

2. Description of the Related Art Conventionally, in order to increase the excavation force of a bucket for an excavation work vehicle, a vibration cylinder 3 is interposed between a bucket cylinder 1 and a bucket 2 as shown in FIG. A vibration applying means (not shown) for alternately and repeatedly supplying high-pressure fluid to the rod side and head side cylinder chambers is provided, and the piston rod 4 of the vibrating cylinder 3 is repeatedly reciprocated by a small amount to swing the bucket 2. By doing so, the bucket teeth 5 are made to vibrate at high frequency, and
As described in JP-A-69852, the base end of an oscillating body having bucket teeth at the tip is swingably supported by a bucket body, and oscillating means for oscillating the oscillating body is provided in the bucket body. It is proposed that the bucket teeth are vibrated by repeatedly rocking the rocking body around the base end by the rocking means. With such a structure, for example, when excavating the hard ground, the bucket cylinder 1 is extended while the bucket teeth 5 are pushed against the hard ground, while the vibrating cylinder 3 swings the bucket 2 at a high frequency or The bucket teeth 5 are vibrated by rocking the rocking body by the rocking means.

[0003]

However, all of the above-mentioned conventional ones exert their effects sufficiently when excavating the soil such as hard ground.
There is a problem that it is almost impossible to crush rocks and other materials with extremely high hardness. The reason is that the vibration of the bucket teeth 5 occurs based on the swing of the bucket 2 (oscillator) around the base end of the bucket 2 (oscillator), that is, near the connection point between the bucket 2 and the arm 7. The vibration trajectory of the bucket teeth 5 is almost parallel to the surface of the concrete floor 8 etc. instead of being perpendicular, and as a result, the bucket teeth 5 only scratch the surface of the concrete floor 8 etc. repeatedly due to the vibration, and the crushing effect is extremely low. It will end up. Moreover, in order to keep the bucket teeth 5 pressed against the concrete floor 8 etc. at the time of this crushing, the fluid is supplied to the bucket cylinder 1 so that it expands. The scratching position gradually moves toward the excavation work vehicle, and the crushing effect becomes even lower. Furthermore, since the above-mentioned one has a plurality of bucket teeth 5 (about 4 to 5), all of these bucket teeth 5 will scratch the concrete floor 8 at the same time. The contact pressure to the floor 8 etc. is dispersed throughout and lowered, and the crushing effect becomes even lower.

An object of the present invention is to provide a bucket for an excavation work vehicle which can easily crush concrete having a very high hardness.

[0005]

SUMMARY OF THE INVENTION Such an object is to provide a bottom plate rotatably connected to an arm tip of an excavation work vehicle, having a substantially dogleg shape, and provided with a plurality of bucket teeth at the tip. In a bucket for an excavation work vehicle, which comprises side plates respectively connected to both side ends of a bottom plate, a casing is fixed to an inner surface on the tip side of the bottom plate, and the tip side of the casing extends parallel to the bucket teeth. Then, the vibrating member, to which one crushing tool protruding from the bucket teeth is connected, is inserted into the tip portion, and the vibration generating means for imparting longitudinal vibration to the vibrating member is housed in the rear end side of the casing. Can be achieved by

[0006]

[Function] When crushing an extremely hard material such as a concrete floor, the crushing tool is pierced almost perpendicularly to the concrete floor or the like, and the oscillating member from the vibration generating means,
A longitudinal vibration is applied to the crushing tool. At this time, since there is only one crushing tool and it projects from the bucket teeth, only this one crushing tool is repeatedly hit almost vertically on the concrete floor or the like, and as a result, the crushing tool is large. Demonstrate the crushing power to easily crush concrete floors. Here, since the aforementioned casing is fixed to the inner surface of the bottom plate,
Even if the bucket rolls the ground, there is no hindrance, and since the vibrating member is inserted at the front end side of the casing and the vibration generating means is stored at the rear end side, this casing is a bucket tooth. Although it becomes longer in the extending direction, the height and width become smaller, and as a result, the inflow of earth and sand into the bucket during excavation is hardly obstructed.

According to the second aspect of the invention, the crushing tool exerts the same excavating function as the bucket teeth when excavating earth and sand, etc., and excavation efficiency is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, 10 is a hydraulic excavator as an excavation work vehicle, and this hydraulic excavator 10 is a crawler 12
Has a traveling frame 11 that moves forward or backward as the vehicle travels. A swivel frame 13 that can swivel in a horizontal plane is supported on the traveling frame 11, and a base end of a boom 15 that swings up and down by a boom cylinder 14 is connected to the swivel frame 13. The base end of an arm 17 that swings up and down by an arm cylinder 16 is connected to the tip of the boom 15, and a pin is attached to the tip of the arm 17.
A bucket 19 for excavating earth and sand is rotatably connected via 18. Reference numeral 20 denotes a bucket cylinder whose head side is connected to the base end of the arm 17, and the tip of the piston rod 21 of the bucket cylinder 20 has a bracket 23 other than the bracket 23 whose one end is connected to the tip of the arm 17 via a pin 22. Pin on the end
It is connected via 24. Reference numeral 25 denotes a fluid device that is interposed between the bracket 23 and the bucket 19 and applies vibration to the bucket 19.The base end of the fluid device 25 is connected to the pin 24, and the tip end portion thereof is connected via the pin 26. Connected to the bucket 19. Then, the bucket 19 swings up and down about the pin 18 when the bucket cylinder 20 operates. The bucket 19 has a substantially V-shaped bottom plate 19a and substantially triangular side plates 19b and 19c connected to both ends of the bottom plate 19a.
The bottom plate 19a is provided with a plurality of bucket teeth 27, four bucket teeth 27 in this case, at the tip of the bottom plate 19a.
And projecting from the tip of, and arranged at equal distances in the width direction.

2, 3, 4, 5, 6, 7, 8, 9, 1
In Nos. 0, 11, and 12, 29 is a crushing device provided on the inner surface of the tip portion of the bottom plate 19a of the bucket 19. The crushing device 29 has a case body 30 fixed to the bottom plate 19a. A storage hole 31 having a circular cross section that extends from the rear end toward the front end is formed in the main body 30. An intermediate block 32 having an axial length shorter than that of the accommodation hole 31 is accommodated in the accommodation hole 31, and a valve chamber 33 having a circular cross section extending from the rear end toward the tip side is formed in the intermediate block 32. Has been done. In the storage hole 31 on the rear end side of the intermediate block 32, there is arranged a disk-shaped partition plate 35 having a connection hole 34 penetrating in the center, and in the storage hole 31 on the rear end side of the partition plate 35. Is a disk-shaped fixed plate
36 are stored. Here, the fixed plate 36 is separated from the partition plate 35 by a predetermined distance, and as a result, the storage hole 31 between the partition plate 35 and the fixed plate 36 becomes a space to form a motor chamber 37. As a result, the motor chamber 37 and the valve chamber 33 are connected to each other through the connection hole 34.

An internal gear type fluid motor 38 is housed in the motor chamber 37. The fluid motor 38 has a substantially cylindrical internal gear having a plurality of internal teeth 39, here five internal teeth 39 are formed. 40
The internal teeth of the internal gear 40 are stored in the internal gear 40 and
A plurality of external gears 41 meshing with the internal gear 39, here four external gears 41 less than the internal gear 39 by one, are formed, and an external gear 42 that eccentrically rotates (revolves) around the axis of the internal gear 40 is formed. A spline hole 44 having a spline inner tooth 43 on the inner periphery thereof is formed at the center of the gear 42. 45 is a storage hole
A cover fixed to the rear end of the case body 30 so as to close the rear end opening of the case 31, and a pin hole 46 into which the pin 24 is inserted is formed at the rear end of the cover 45. Reference numeral 47 is a pin that penetrates the intermediate block 32, the partition plate 35, the internal gear 40, and the fixed plate 36, and both ends of this pin 47 are inserted and fixed to the case body 30 and the cover 45, respectively. As a result, the intermediate block 32, the partition plate 35, the internal gear 40, and the fixed plate 36 are the case body 30 and the cover 45.
It will be fixed while being stopped from rotating. Case body 30, intermediate block 32, partition plate 3 described above
After the motor chamber 37, the valve chamber 33 coaxial with the motor chamber 37, and the connection hole 34 connecting the motor chamber 37 and the valve chamber 33 are formed inside the fixed plate 36 and the cover 45 as a whole. The side casing 48 is configured.

A slide bearing 51 and a cylindrical rotary valve body 53 having a through hole 52 formed therein are housed in the valve chamber 33. The rotary valve body 53 is an internal gear 40 of a fluid motor 38.
It is possible to rotate around the axis while maintaining a coaxial relationship with. The spline inner teeth 54 are formed on the inner periphery of the through hole 52 of the rotary valve body 53. Reference numeral 58 denotes a connecting rod penetrating the connection hole 34. The connecting rod 58 has a tip end side inserted into the through hole 52 and a rear end side inserted into the spline hole 44. The spline outer teeth 59 formed on the outer circumference of the tip of the transmission rod 58 mesh with the spline inner teeth 54, and the spline outer teeth 60 formed on the outer circumference of the rear end mesh with the spline inner teeth 43. ,
The transmission rod 58 connects the rotary valve body 53 and the external gear 42 of the fluid motor 38. When the external gear 42 is eccentrically rotated, the transmission rod 58 transmits the rotation of the external gear 42 to the rotary valve body 53 while performing a precession motion centered on the tip, and the rotary valve body 53
Rotate 53 around the axis.

Reference numeral 62 denotes a discharge annular groove extending continuously in the circumferential direction between the inner circumference of the valve chamber 33 and the outer circumference of the rotary valve body 53, more specifically, on the outer circumference of the rotary valve body 53. A communication hole 63, which extends in the radial direction and communicates with the through hole 52, is formed on the bottom surface of the groove 62. Reference numeral 64 denotes a discharge hole having one end opened to the outer periphery of the central portion of the transmission rod 58, and the other end of the discharge hole 64 opens to the rear end surface of the transmission rod 58. 65 is the rear casing
Within 48, more specifically, in the fixed plate 36 and the cover 45, one end communicates with the spline hole 44 and the other end is a discharge passage opened to the outer periphery of the cover 45. The discharge passage 65 communicates with the discharge annular groove 62. The fluid flowing out to the spline hole 44 through the hole 63, the through hole 52, and the discharge hole 64 is discharged from the crushing device 29.
67 and 68 are first and second supply rings provided between the inner periphery of the valve chamber 33 and the outer periphery of the rotary valve body 53, here on the outer periphery of the rotary valve body 53 on both axial sides of the discharge annular groove 62. These first and second supply annular grooves 67 and 68 are grooves and extend continuously in the circumferential direction. 69 is inside the rear casing 48, specifically, the intermediate block 32, the partition plate 35, the internal gear 40, and the fixed plate
36, a first supply passage formed in the cover 45, one end of the first supply passage 69 communicates with the first supply annular groove 67, and the other end opens to the outer periphery of the cover 45. Then, the first supply passage 69 supplies the fluid to the first supply annular groove 67. 70 is inside the rear casing 48, more specifically the intermediate block 3
2, a partition plate 35, an internal gear 40, a fixed plate 36, a second supply passage formed in the cover 45, one end of the second supply passage 70 communicates with the second supply annular groove 68, the other end Is open to the outer periphery of the cover 45. The second supply passage 70 is arranged at a predetermined angle in the circumferential direction from the first supply passage 69, and supplies the fluid to the second supply annular groove 68.

Reference numeral 72 denotes a plurality of first concave grooves formed on the outer circumference of the rotary valve body 53 at equal distances in the circumferential direction. These first concave grooves 72 are formed from the first supply annular groove 67 to the discharge annular groove 62. Extending axially toward. Reference numeral 73 denotes a plurality of second recessed grooves formed on the outer circumference of the rotary valve body 53 at equal distances in the circumferential direction. The second recessed grooves 73 extend from the second supply annular groove 68 toward the discharge annular groove 62. It extends in the axial direction. Reference numeral 74 denotes a plurality of third recessed grooves that are circumferentially equidistant from each other on the outer periphery of the rotary valve body 53 and that are alternately arranged with the first recessed grooves 72 in the circumferential direction.
74 extends in the axial direction from the discharge annular groove 62 toward the first supply annular groove 67, and the tip end portion close to the first supply annular groove 67 is the tip end portion of the first concave groove 72 close to the discharge annular groove 62. They overlap each other in the circumferential direction. Reference numeral 75 denotes a plurality of fourth grooves that are formed on the outer periphery of the rotary valve body 53 at equal distances in the circumferential direction and that are arranged alternately with the second grooves 73 in the circumferential direction. 75 extends in the axial direction from the discharge annular groove 62 toward the second supply annular groove 68, and the tip end portion close to the second supply annular groove 68 is the tip end portion of the second concave groove 73 close to the discharge annular groove 62. They overlap each other in the circumferential direction.

Reference numeral 77 designates a plurality of supply / discharge passages formed in the rear casing 48, specifically, the intermediate block 32 and the partition plate 35, which are formed equidistantly in the circumferential direction, here, the same number as the internal teeth 39 of the internal gear 40. Yes, one end of these supply / discharge passages 77 has the first,
The valve chamber so as to face the overlapping portion of the third groove 72, 74.
The inner end of 33 is opened, and the other end communicates with the fluid chamber 78 between the internal gear 40 and the external gear 42 between the internal teeth 39. Then, these supply / discharge passages 77 extend from the first groove 72 to the fluid chamber.
The fluid is supplied to 78 or discharged from the fluid chamber 78 to the third groove 74. Reference numeral 80 denotes a plurality of guide passages, here two guide passages, which are formed in the rear casing 48, specifically, in the case body 30 and the intermediate block 32 so as to be separated from each other in the circumferential direction. One end of each of the guide passages 80 is a second recess. The groove 73 and the fourth recessed groove 75 are opened to the inner circumference of the valve chamber 33 so as to face the overlapping portion, and the other end is opened to the outer surface of the rear casing 48, specifically, the front end surface of the case body 30. . And these guide passages 80 are the second
The fluid from the groove 73 is guided and the fluid to the fourth groove 75 is guided. The above-mentioned intermediate block 32 and rotary valve body 53 as a whole receive a rotational force from the fluid motor 38 via the transmission rod 58, thereby switching the supplied high-pressure fluid at a high frequency and guiding it to a vibration member 94 described later. The valve 81 is constituted, and the fluid motor 38 and the vibration valve 81 as a whole constitute a vibration generating means 79 which is housed in the rear casing 48 and imparts longitudinal vibration to the vibration member 94.

In FIGS. 2, 3 and 13, reference numeral 85 denotes a cylinder case which constitutes a part of the front casing 83. The cylinder case 85 is fixed to the front end surface of the rear casing 48 coaxially with the rotary valve body 53. Has been done. This cylinder case 85
A cylinder hole 84 extending from the front end toward the rear end is formed inside, and a cylinder hole is formed at the front end of this cylinder case 85.
A cover 86 that closes the tip opening of 84 is fixed. A piston 82 is housed in the cylinder hole 84 so as to be movable in the axial direction, and the piston 82 partitions the cylinder hole 84 into a front end side chamber 84a and a rear end side chamber 84b. This piston
Cushion protrusions 87 and 88 are formed on the tip side face and the rear end side face of 82, respectively, and a piston rod 89 penetrating the cover 86 is connected to the tip face of the cushion protrusion part 87. 91 and 92 are cushion dents formed on the inner surface of the cover 86 and the bottom surface of the cylinder hole 84. These cushion dents 91 and 92 have slightly larger inner diameters than the cushion ridges 87 and 88, and are moved by the movement of the piston 82. Cushion convex part 87, 88
When is inserted, the moving speed of the piston 82 is reduced to give a cushioning force. Reference numeral 93 denotes a pair of supply / discharge passages formed in the cylinder case 85. One supply / discharge passage 93a has one end communicating with the tip side chamber 84a and the other end communicating with the other end opening of the one guide passage 80. There is. Further, one end of the other supply / discharge passage 93b communicates with the rear end side chamber 84b, and the other end communicates with the other end opening of the other guide passage 80. Cylinder case 85 and cover described above
86 constitutes the above-mentioned front casing 83 as a whole, and the above-mentioned piston 82 and piston rod 89 as a whole are slidably inserted into the front casing 83 and extend parallel to the bucket teeth 27. The vibrating member 94 is configured. The vibrating member 94 reciprocates in the axial direction by the high pressure fluid supplied and discharged through the guide passage 80 to vibrate. In addition, the rear casing 48 and the front casing described above
Although 83 constitutes the casing 95 as a whole, since the vibrating member 94 described above is inserted in the front casing 83, it means that the vibrating member 94 is inserted in the tip portion of the casing 95, and the vibration generating means 79 is Since it is stored in the side casing 48, it is stored in the rear end side of the casing 95. The vibration member 94, more specifically, the piston rod 89
The rear end of one crushing tool 96 is inserted at the tip of
They are connected to each other by a connecting pin 97 penetrating them. The crushing tool 96 has a cylindrical shape coaxial with the piston rod 89, and its tip end side projects from the tip end of the bucket teeth 27. In addition, inclined flat surfaces 96a that are substantially parallel (having substantially the same gradient) to the inclined surfaces 27a of the bucket teeth 27 are formed on both sides at the tip of the crushing tool 96, and the extended surfaces of these inclined flat surfaces 96a are bottoms. Plate 19
It intersects the extended surface of a at the same acute angle. As a result, the tip of the crushing tool 96 is tapered. Then, the vibration generating means 79 and the vibration member 9 described above
4, the casing 95 and the crushing tool 96 together constitute the crushing device 29. The fluid device 25 described above has substantially the same structure as that of the crushing device 29 described above with the crushing tool 96 removed.

In FIG. 14, reference numeral 106 denotes a switching valve installed on the operator's cab of the swivel frame 13 of the hydraulic excavator 10. The switching valve 106 and the fluid pump 107 as a fluid source installed on the swivel frame 13 and a discharge source. The tank 108 is connected by a supply passage 109 and a discharge passage 110, respectively. 111 is the fluid pump 107 and the tank 10
Reference numeral 112 is a suction passage connecting with the valve 8, and 112 is a relief valve interposed between the supply passage 109 and the discharge passage 110. Further, the switching valve 106 and the other end of the first supply passage 69 are connected by a supply passage 118, and a pilot type flow control valve 119 (a pilot type flow control valve may be used) is provided in the middle of the supply passage 118. It is installed. Switch valve 106 and flow control valve 1
One end of a branch path 113 in which a pilot type flow rate control valve 114 (or a pilot type flow rate control valve may be interposed) is connected to the supply path 118 between the branch path 19 and 1
The other end of 13 is connected to the other end of the second supply passage 70. The flow control valves 119 and 114 have pilot passages 115 and 1
Pilot pressure is supplied from 16. 117 is a discharge passage that connects the switching valve 106 and the other end of the discharge passage 65.

Next, the operation of the embodiment of the present invention will be described. When crushing extremely hard things such as concrete floors, boom cylinder 1 of hydraulic excavator 10
4. The arm cylinder 16 and the bucket cylinder 20 are appropriately operated to push the crushing tool 96 almost vertically to the concrete floor or the like. At this time, since the number of the crushing tool 96 is one and the crushing tool 96 projects from the bucket teeth 27, only the tip of the crushing tool 96 projects to the concrete floor or the like. In order to keep the crushing tool 96 pressed against a concrete floor in this state, a fluid is supplied to the bucket cylinder 20 so that its piston rod 21 projects, and vibration is generated to apply crushing force to the crushing tool 96. Vibration from the means 79 is applied to the vibrating member 94 and the crushing tool 96 in the longitudinal direction.

Such vibration application is performed as described below. That is, first, the switching valve 106 is switched from the stop position to the flow position, and the high pressure fluid discharged from the fluid pump 107 is supplied to the supply passage 109, the supply passage 118, the branch passage 113, the first and second supply passages 69, 70. Through the first and second supply annular groove
Supply to 67 and 68. At this time, a certain supply / discharge passage 77 and guide passage 80 communicate with the first and second recessed grooves 72, 73, respectively, and the remaining supply / discharge passage 77 and guide passage 80 have the third and fourth recessed grooves 7 and 7.
Assuming that the high pressure fluid is communicated with 4 and 75, the high pressure fluid is supplied from the first supply annular groove 67 to a part of the fluid chamber 78 of the fluid motor 38 through the supply / discharge passage 77 described above. As a result, the external gear 42 of the fluid motor 38 receives a driving force from the inflowing fluid and eccentrically rotates about the axis of the internal gear 40 (revolution).
However, at this time, since the external gear 42 meshes with the internal gear 40 having only one tooth, the external gear 42 rotates about its own axis as well as revolves. Here, since the spline external teeth 59 and 60 of the transmission rod 58 mesh with the rotary valve body 53 and the spline internal teeth 54 and 43 of the external gear 42, respectively, the rotational drive based on the rotation of the external gear 42 of the fluid motor 38 is performed. The force is transmitted to the rotary valve body 53 via the transmission rod 58 that precesses,
The rotary valve body 53 is rotated around the axis. At this time, the return fluid is pushed out from a part of the fluid chamber 78 of the fluid motor 38 into the remaining supply / discharge passage 77. This fluid is the third concave groove 74, the discharge annular groove 62, the communication hole 63, the through hole 52, Discharge hole 64, discharge passage 65,
It is discharged to the tank 108 through the discharge passage 117 and the discharge passage 110. On the other hand, the high-pressure fluid supplied to the second supply annular groove 68 passes through the certain guide passage 80 and the supply / discharge passage 93b to the rear end side chamber.
It is supplied to 84b and the vibrating member 94 is projected. At this time,
The low-pressure fluid is discharged from the front end side chamber 84a, and the discharged return fluid is supplied to and discharged from the supply passage 93a, the remaining guide passage 80, and the fourth passage.
Concave groove 75, discharge annular groove 62, communication hole 63, through hole 52, discharge hole 6
4, discharged to the tank 108 through the discharge passage 65, the discharge passage 117, and the discharge passage 110.

Next, when the rotary valve body 53 is slightly rotated by receiving the rotational driving force from the fluid motor 38, the supply / discharge passage 77 is formed.
And the first and third recessed grooves 72, 74 communicate with each other in the circumferential direction, and the position where the high-pressure fluid is supplied moves in the circumferential direction, whereby the external gear 42 of the fluid motor 38 rotates in the same direction. continue. At this time also, the return fluid discharged from the fluid motor 38 is discharged to the tank 108 through the discharge annular groove 62 and the discharge passage 65. On the other hand, by the rotation of the rotary valve body 53 described above,
Up to now, the guide passage 80 communicating with the second groove 73 has a fourth
The remaining guide passage 80 communicating with the fourth groove 75 is connected to the groove 75.
Communicates with the second groove 73, and the high-pressure fluid from the fluid pump 107 receives the second supply annular groove 68, the remaining guide passage 80,
The vibrating member 94 flows into the tip side chamber 84a through the supply / discharge path 93a.
Is moved in the opposite direction, that is, retracted. At this time,
The return fluid discharged from the rear end side chamber 84b is a supply / discharge passage 93b, a certain guide passage 80, a fourth concave groove 75, a discharge annular groove 62, a discharge passage 65.
Through the tank 108.

Next, when the rotary valve body 53 is further rotated slightly in the same direction by the fluid motor 38, a certain supply / discharge passage 77 and a guide passage 80 are respectively formed in the first and second concave grooves 72, 73, as in the initial stage. While communicating with each other, the remaining supply / discharge passage 77 and the guide passage 80 are communicated with the third and fourth concave grooves 74 and 75, respectively.
The vibrating member 94 comes to project again. In this way, the rotary valve body 53 rotates and the supply / discharge passage 77 and the first and third concave grooves 72,
When the communication with 74 gradually shifts in the circumferential direction, the external gear 42 of the fluid motor 38 continuously rotates in the same direction to rotate the rotary valve body 53. Further, due to the rotation of the rotary valve body 53, a certain guide passage 80 and the remaining guide passage 80 are separated into the second and fourth guide passages.
The high-pressure fluid is alternately supplied to the front and rear end side chambers 84a and 84b for a short time by communicating with the concave grooves 73 and 75 alternately. This allows
The vibrating member 94 repeatedly reciprocates to generate vibrations, which are transmitted to the crushing tool 96 and repeatedly hit the crushing tool 96 on a concrete floor or the like almost vertically. At this time, the number of the crushing tool 96 is one as described above, and since it projects from the bucket teeth 27, the crushing tool 96 exerts a great crushing force and easily crushes the concrete floor or the like.

Next, when excavating the earth and sand using the hydraulic excavator 10 described above, the boom cylinder 14, the arm cylinder 16 and the bucket cylinder 20 are appropriately operated to scoop the earth and sand with the bucket 19. At this time, the vibration member 94 is inserted into the front end side of the casing 95, and the vibration generating means 79 is inserted into the rear end side.
Since the casing 95 is long in the extending direction of the bucket teeth 27, its height and width are small, and as a result, the bucket 19 at the time of excavation is
It hardly obstructs the inflow of sediment into the interior. Further, since the above-mentioned casing 95 is fixed to the inner surface of the bottom plate 19a, it does not become an obstacle even when the bucket 19 rolls the ground. Further, at the time of such excavation, since the tip end of the crushing tool 96 is tapered like the bucket teeth 27, the crushing tool 96 exerts the excavating function similarly to the bucket teeth 27, and the excavation efficiency is improved. . Here, if the earth and sand being excavated is soft, a large amount of earth and sand may adhere to the bucket 19, but if such a large amount of earth and sand adheres to the bucket 19, the efficiency of excavation work decreases. The fluid device 25 is operated to apply vibration to the bucket 19 to shake off the adhered earth and sand. When the earth and sand are excavated in this manner, the crushing tool 96 can be removed from the vibrating member 94.

[0022]

As described above, according to the present invention, it is possible to easily crush concrete floors and the like having extremely high hardness.

[Brief description of drawings]

FIG. 1 is a schematic overall front view showing a state in which an embodiment of the present invention is applied to a hydraulic excavator.

FIG. 2 is a perspective view of a bucket.

FIG. 3 is a cross-sectional view of a crushing device.

FIG. 4 is a plan view of a rear end portion of a casing.

5 is a sectional view taken along the line AA of FIG.

6 is a sectional view taken along the line BB of FIG.

7 is a cross-sectional view taken along the line CC of FIG.

8 is a cross-sectional view taken along the line DD of FIG.

9 is a sectional view taken along the line EE of FIG.

10 is a cross-sectional view taken along the line FF of FIG.

11 is a sectional view taken along the line GG in FIG.

FIG. 12 is a sectional view taken along the line HH of FIG.

FIG. 13 is a plan sectional view of the vicinity of a crushing tool.

FIG. 14 is a circuit diagram of an embodiment of the present invention.

FIG. 15 is a schematic overall front view showing a conventional excavation work vehicle.

[Explanation of symbols]

 10 ... Excavation work vehicle 17 ... Arm 19 ... Bucket 19a ... Bottom plate 19b ... Side plate 27 ... Bucket teeth 27a ... Inclined surface 79 ... Vibration generating means 94 ... Vibration member 95 ... Casing 96 ... Crushing tool 96a ... Inclined flat surface

Claims (2)

[Claims] 1. A bottom plate 19a rotatably connected to a tip of an arm 17 of an excavation work vehicle 10 and having a plurality of bucket teeth 27 at its tip, and both side ends of the bottom plate 19a. Side plates connected to each
In a bucket for an excavation work vehicle comprising 19b and 19c, a casing 95 is fixed to the inner surface on the tip side of the bottom plate 19a, and extends on the tip side of the casing 95 in parallel with the bucket teeth 27 and Bucket teeth
A vibration generating means for inserting a vibrating member 94, to which one crushing tool 96 protruding from 27 is connected, and further applying longitudinal vibration to the vibrating member 94 at the rear end side of the casing 95.
A bucket for excavation work vehicles, characterized by containing 79. 2. The tip of the crushing tool 96 is tapered by forming an inclined flat surface 96a substantially parallel to the inclined surface 27a of the bucket teeth 27 at the tip of the crushing tool 96. Bucket for excavation work vehicles.