JP3020213U - Backhoe working unit - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a backhoe working unit capable of easily responding to switching between crushing work by a hydraulic breaker body and excavation work by a bucket. [Structure] A hydraulic breaker body 30 having an insertion hole 47 of a chisel 46 at the tip of an arm 28 is mounted via a bracket 31. A mounting shaft 56 that can be inserted into the insertion hole 47 is provided on the back surface 55A of the bucket 55. A bracket 57 for receiving the connection with the bracket 31 is provided on the back surface 55A of the bucket 55. [Effect] During excavation work, the mounting shaft 56 is inserted into the insertion hole 47, and the receiving bracket 57 is connected to the connecting bracket 58 provided on the bracket 31. It is possible to easily replace the chisel with the bucket 55 without removing the hydraulic pipes 51 and 52. In addition, since the receiving bracket 57 and the connecting bracket 58 of the bracket 31 receive the excavation work, durability can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a working unit of a backhoe in which a crushing chisel and an excavating bucket can be selectively attached to a tip end side of an upper swing body via a boom, an arm, and a hydraulic actuator.

[0002]

[Prior art]

 Conventionally, as shown in FIG. 5, this type of hydraulic system has a chisel 2 detachably attached to the tip side of an arm 1 which is connected to an upper swing body via a boom (neither is shown) at the time of crushing. A breaker body 3 is attached, while a bucket 4 is attached to the tip end side of the arm 1 instead of the hydraulic breaker body 3 during excavation.

A bracket 5 is provided on the hydraulic breaker body 3, and the bracket 5 is connected to the arm 1 via a pin 6. The bracket 5 is connected to the tip of the hydraulic actuator 7 by a pin 9 via a link 8. Further, the chisel 2 is inserted into a chisel insertion hole (not shown) of the hydraulic breaker body 3, and the hydraulic pipe 10A for hydraulic oil pumped from an oil pump (not shown) is connected to the hydraulic breaker body 3. It is connected to the hydraulic piping 10, etc. Therefore, after positioning the chisel 2 at the crushing point by the operation of the hydraulic actuator 7, the boom cylinder, the arm cylinder (neither is shown), or the turning of the upper revolving structure, the oil is connected by the hydraulic pipes 10 and 10A. The hydraulic oil pumped from the pump serves as a drive source, and a hammer piston (not shown) built in the hydraulic breaker body 3 reciprocates, and the reciprocating motion strikes the upper part of the chisel 2 for crushing work. There is.

On the other hand, a bracket 11 for mounting is provided on the upper portion of the bucket 4. When the excavation work is performed after the crushing work, first, the pins 6 and 9 of the bracket 5 are pulled out to remove the hydraulic breaker body 3, and the hydraulic pipes 10 and 10A are also removed. Then, the bucket 4 mounts the bracket 11 on the arm 1 using the pins 6 and 9 and attaches it to the link 8. Therefore, when excavating work, the bucket 4 is swung by the operation of the hydraulic actuator 7, the boom cylinder, the arm cylinder, or the swing of the upper swing body.

[0005]

[Problems to be solved by the device]

 In the above-mentioned prior art, when the work content is changed from crushing work to excavation work or from excavation work to crushing work, the pins 6 and 9 are removed, and then the hydraulic breaker main body 3 or the bucket 4 is replaced with the pin 6 again. , 9 is used for mounting, but the replacement work was a heavy labor. Also, when replacing the hydraulic breaker body 3, the hydraulic pipes 10 and 10A must be attached and detached. Therefore, when the hydraulic pipes 10 and 10A are removed and installed, hydraulic oil may be spilled around. At that time, dust in the atmosphere mixes into the hydraulic pipes 10 and 10A, and after the pipes 10 and 10A are connected, the dust passes through the hydraulic pipes 10 and 10A and the main body of the hydraulic breaker 3 and the other hydraulic systems. This could lead to various valves, which could cause malfunctions.

As one means for solving such a problem, for example, Japanese Utility Model Laid-Open No. 1-69851 discloses a hydraulic breaker provided with a bucket in a direction orthogonal to the hydraulic breaker. In this system, the crushing work is performed by a downwardly oriented hydraulic breaker chisel, and the bucket is changed to the downward direction by making the chisel sideways to the driver's seat side to perform excavation with a bucket.

However, in such a hydraulic breaker in which a bucket is integrally provided, since the chisel faces the driver's seat side during excavation work with the bucket facing downward, the field of view is blocked by the chisel. There is a problem that visibility of the excavated part from the driver's side is poor. Further, in the case where the hydraulic breaker is provided with a bucket, there is a problem that the excavation range is reduced as compared with the case where the bucket 1 is directly provided in the arm 1 shown in FIG.

The present invention solves the above-mentioned problems, and a backhoe work for selectively attaching a crushing chisel and an excavating bucket to the upper swing body via a boom, an arm and a hydraulic actuator on the tip side. It is an object of the present invention to provide a backhoe work unit that can easily switch between crushing work using a hydraulic breaker body and excavation work using a bucket, and can completely prevent dust from mixing in the hydraulic oil at that time. . Another object of the present invention is to provide a backhoe working unit capable of improving the mounting strength of the bucket. A further object of the present invention is to provide a backhoe working unit in which the orientation of the chisel or bucket can be freely adjusted. Another object of the present invention is to provide a working unit of a backhoe that can easily replace a chisel and a bucket.

[0009]

[Means for Solving the Problems]

 According to a first aspect of the present invention, in the working section of the backhoe in which the hydraulic breaker for crushing and the bucket for excavation are selectively attached to the tip end side of the upper swing body via the boom, the arm and the hydraulic actuator, the arm is provided. Is a working part of a backhoe in which a hydraulic breaker main body having a chisel insertion hole at its tip is mounted via a bracket, and a mounting shaft which can be inserted into the insertion hole is provided at the back surface of the bucket.

According to a second aspect of the present invention, there is provided a working portion of the backhoe according to the first aspect, wherein a connection receiving portion for connecting to the bracket is provided on a back surface of the bucket.

According to a third aspect of the present invention, the bracket is pivotally attached to a tip of the arm, and further, a first link is provided to a tip of a rod of a hydraulic actuator whose base end is pivotally attached to the arm. The working unit of the backhoe according to claim 2, wherein the working unit is pivotally attached to the backhoe, and a second link is provided between the tip of the rod and the arm.

According to a fourth aspect of the present invention, the chisel and the mounting shaft are each provided with a notch portion with which a stopper inserted from the hydraulic breaker body is locked. Is the working part of.

[0013]

[Action]

 In the working section of the backhoe according to the first aspect, the chisel is inserted into the insertion hole of the hydraulic breaker main body and the hydraulic breaker main body is operated at the time of crushing. At the time of excavation, the bucket can be attached by inserting the attachment shaft into the insertion hole.

In the working section of the backhoe according to the second aspect, the bucket not only inserts the mounting shaft into the insertion hole of the hydraulic breaker body, but also fixes the bracket of the bucket and the breaker by the connection receiving section. To be done.

In the working unit of the backhoe according to the third aspect, the hydraulic breaker body can be rotated by the operation of the hydraulic actuator.

In the working portion of the backhoe according to the fourth aspect, the chisel and the mounting shaft can be easily removed and mounted by attaching and detaching the stopper.

[0017]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. Reference numeral 21 is a backhoe crawler vehicle body, 22 is an upper revolving structure provided with a driver's seat 23 that is provided on the upper portion of the crawler vehicle body 21 so as to be freely rotatable, and a working unit 24 is provided in front of the upper revolving structure 22. It is provided. In the working unit 24, a boom 26 is provided on the upper revolving structure 22 so as to be able to rise and fall by a boom cylinder 25, and an arm 28 is provided at the tip of the boom 26 for rotation by an arm cylinder 27. Further, a bucket, which will be described later, is provided on the tip side of the arm 28. A base end 29A of a hydraulic actuator 29, which is a bucket cylinder, is rotatably connected to the arm 28.

Further, a hydraulic breaker main body 30 is provided at the tip of the arm 28 via a bracket 31. The bracket 31 includes a pair of left and right side plate portions 31A and 31B, and the hydraulic breaker body 30 is fixed between them. Then, first and second bosses 32, 33 are provided on the side seats 31A, 31B on the driving seat 23 side. The first boss 32 and the boss 34 provided at the tip of the arm 28 are connected by a first pivotally mounted pin 35. Further, the second boss 33 located at the upper part and the boss 37 provided at the tip of the first link rod 36 are connected by the second pivotally mounting pin 38. The base end of the first link rod 36 is connected to the tip of the rod 39 of the hydraulic actuator 29 via a third pivot pin 40. Further, a second link 41 is provided at the tip of the rod 39 and the tip side of the arm 28. The upper part of the second link 41 is connected by a third pivoting pin 40, and the lower part of the second link 41 is connected by a fourth pivoting pin 42 to the tip of the arm 28. Has been done.

As shown in FIG. 4, the hydraulic breaker body 30 is provided with a valve casing 43 in which an accumulator 42 and a pilot valve (not shown) are built in, and a casing provided below the valve casing 43. A hammer piston 45 is provided in 44 for reciprocating movement. Further, a chisel holder 48 having an insertion hole 47 for the chisel 46 is provided in the lower portion of the casing 44. Then, the chisel 46 is inserted into the insertion hole 47, and the stopper 48A is inserted into the chisel holder 48 so as to engage with the notch 46A formed in the upper portion of the chisel 46, and the chisel 46 is inserted and attached. it can. The cutout portion 46A is formed so that the chisel 46 can reciprocate.

A high-pressure hydraulic pipe 51 is provided along the boom 26 and the arm 28 from an oil pump 49 provided on the upper swing body 22 via a control valve 50, and the high-pressure hydraulic pipe 51 is It is connected to the high pressure hydraulic port 51A of the valve casing 43. On the other hand, the low-pressure hydraulic pipe 52 connected to the low-pressure hydraulic port 52A of the valve casing 43 is connected to the hydraulic oil tank 53 provided on the upper swing body 22 along the boom 26 and the arm 28. The oil pump 49 and the hydraulic oil tank 53 are connected by a circulating hydraulic pipe 54. Therefore, the hydraulic oil pumped from the oil pump 49 is supplied to the pilot valve through the high-pressure hydraulic pipe 51 and the high-pressure hydraulic port 51A to cause the hammer piston 45 to reciprocate in the casing 44, and this operation strikes the chisel 46. Then, the crushing work is performed.

Reference numeral 55 denotes a bucket, which is replaced with the chisel 46 and selectively attached to the front end of the arm 28. The bucket 55 is provided with a mounting shaft 56 that can be inserted into the insertion hole 47. The mounting shaft 56 is provided on the back surface 55A of the bucket 55 upward by welding or the like, and a cutout portion 56A similar to the cutout portion 46A of the chisel 46 is provided at the upper end thereof. The cutout portion 56A can be almost fitted with the stopper 48A. Further, a coupling receiving bracket 57 which is a coupling receiving portion with the bracket 31 is fixed to an upper portion of the back surface 55A of the bucket 55. The coupling receiving bracket 57 is formed in a laterally long shape, and a coupling bracket 58 as a coupling portion is provided on the bracket 31 corresponding to the coupling receiving bracket 57. The brackets 57 and 58 can be fixed by bolts 59 and nuts 60 penetrating holes 57A and 58A formed in the brackets 57 and 58, respectively.

Next, the operation of the above configuration will be described. When carrying out the crushing operation, the chisel 46 is inserted into the insertion hole 47 as usual, and the stopper 48A is inserted into the chisel holder 48 and locked in the notch 46A. After that, the chisel 46 is positioned at a predetermined position by rotating the upper revolving structure 22, operating the boom cylinder 25, the arm cylinder 27, and the hydraulic actuator 29, and operating the control valve 50 as usual to remove the oil from the oil pump 49. The hydraulic oil is sent to the hydraulic breaker main body 30 via the high-pressure hydraulic pipe 51 to reciprocate the hammer piston 45, and the reciprocating motion strikes the chisel 46 to perform crushing work.

On the other hand, when performing the excavation work as shown in FIG. 2, first, the stopper 48A is pulled out from the chisel holder 48, and the chisel 46 is pulled out from the hydraulic breaker body 30. Next, the mounting shaft 56 of the bucket 55 is inserted into the insertion hole 47 of the hydraulic breaker main body 30 and the stopper 48A is inserted into the chisel holder 48 to fix the mounting shaft 56 to the hydraulic breaker main body 30. Next, the bolts 59 are inserted into the holes 57A and 58A of the coupling receiving bracket 57 and the coupling bracket 58, and fixed by the nuts 60. After mounting the bucket 55 on the arm 28 in this way, the bucket 55 is rocked to excavate a predetermined portion by swinging by the upper swing body 22 and operating the boom cylinder 25, the arm cylinder 27, and the hydraulic actuator 29 as usual. It is a thing. During the excavation work, the hydraulic oil is not sent to the hydraulic breaker body 30 under pressure.

As described above, in the embodiment of the present invention, the hydraulic brake for crushing is provided on the tip side through the boom 26, the arm 28 and the hydraulic actuator 29 in the upper swing body 22 according to claim 1. In the working section 24 of the backhoe for selectively mounting the boom 30 and the bucket 55 for excavation, mount the hydraulic breaker body 30 having the insertion hole 47 of the chisel 46 at the tip of the arm 28 via the bracket 31. Since the mounting shaft 56 that can be inserted into the insertion hole 47 is provided on the back surface 55A of the bucket 55, the chisel 46 is inserted into the insertion hole 47 of the hydraulic breaker body 30 at the time of crushing, and the hydraulic breaker main body 30 The crushing operation can be performed by activating. On the other hand, when mounting the bucket 55 instead of the chisel 46, the mounting shaft 56 is inserted into the insertion hole 47, and the bucket 55 is mounted on the tip of the arm 28 via the hydraulic breaker body 30. Therefore, at the time of crushing work, the driver's seat 23 side can visually recognize the chisel 46 and its surroundings for accurate crushing work, and at the time of excavation work, the driver's seat 23 side can visually recognize the bucket 55 and its surroundings accurately. Can perform excavation work. Further, since the chisel 46 and the bucket 55 can be exchanged while the hydraulic breaker body 30 is attached to the tip of the arm 28, the high pressure hydraulic pipe 51 and the low pressure hydraulic pipe 52 cannot be disconnected or connected at the time of this exchange. You don't have to. Therefore, there is no possibility that dust will be mixed into the high-pressure hydraulic pipe 51 and the low-pressure hydraulic pipe 52, and as a result, dust can be prevented from entering the equipment such as the pilot valve of the hydraulic breaker body 30 and the failure can be eliminated. Also, there is no leakage of hydraulic oil. Moreover, there is no fear that the excavation range will be reduced as compared with the hydraulic breaker provided with a bucket as in the above Japanese Utility Model Laid-Open No. 1-69851.

Further, according to the embodiment of the present invention, in accordance with claim 2, a coupling receiving bracket 57 which is a coupling receiving portion on the back surface 55 A of the bucket 55 and a coupling bracket 58 provided on the bracket 31 of the hydraulic breaker body 30. By fixing and with bolts 59 and nuts 60, the force applied to the bucket 55 during excavation work is received by the connecting bracket 57 and the connecting bracket 58. It can improve the sex.

Further, in an embodiment of the present invention, according to claim 3, the bracket 31 is pivotally attached to the tip of the arm 28, and further, the base end 29A is pivotally attached to the arm 28. Since the second link 41 is pivotally attached to the tip of the rod 39 of the 29 through the first link 36 and the second link 41 is provided between the tip of the rod 39 and the arm 28, the operation of the hydraulic actuator 29 is performed. Thus, the bracket 31, and hence the hydraulic breaker main body 30, can be freely rotated to change the directions of the chisel 46 and the bucket 55.

In addition, in the embodiment of the present invention, the chisel 46 and the mounting shaft 5 correspond to claim 4.
6 is provided with notches 46A and 56A, respectively, into which the stopper 48A inserted from the hydraulic breaker body 30 having the insertion hole 47 of the chisel 46 is engaged, so that the chisel can be easily attached and detached by removing the stopper 48A. 46, the bucket 55 can be replaced.

The present invention is not limited to the above embodiment, but various modifications can be made.

[0029]

[Effect of device]

 According to a first aspect of the present invention, in the working section of the backhoe in which the hydraulic breaker for crushing and the bucket for excavation are selectively attached to the tip end side of the upper swing body via the boom, the arm and the hydraulic actuator, the arm is provided. It is a working part of the backhoe that is equipped with a hydraulic breaker body with a chisel insertion hole at the tip of the bracket via a bracket and a mounting shaft that can be inserted into the insertion hole on the back of the bucket. Crushing can be performed by inserting the chisel, and excavation can be performed by attaching the bucket by inserting the bucket mounting shaft into the insertion hole. Therefore, when installing the bucket, the hydraulic breaker body can be installed without removing it, so that the replacement work can be easily performed. Moreover, the replacement work does not require removal of the hydraulic pipe, and therefore, there is no fear that dust or the like may be mixed in the hydraulic pipe and leakage of hydraulic oil. Furthermore, the bucket can be attached to the tip of the arm independently, and the excavation range can be secured.

According to a second aspect of the present invention, there is provided a working portion of the backhoe according to the first aspect, characterized in that a connection receiving portion for connecting to the bracket is provided on a back surface of the bucket. Since the force applied to the joint is received by the connection receiving portion, durability can be improved.

According to a third aspect of the present invention, the bracket is pivotally attached to a tip of the arm, and further pivotally attached to a tip of a rod of a hydraulic actuator whose base end is pivotally attached to the arm via a first link. The working part of the backhoe according to claim 2, wherein a second link is provided between the tip of the rod and the arm, wherein the hydraulic breaker body can be rotated by the operation of the hydraulic actuator. The direction of the chisel and bucket can be freely adjusted.

According to a fourth aspect of the present invention, the chisel and the mounting shaft are respectively provided with notches for engaging a stopper inserted from the hydraulic breaker body. It is a working part of and the chisel and bucket can be easily replaced by the stopper.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a partially cutaway front view of an essential part showing an embodiment of the present invention.

FIG. 4 is a partially cutaway perspective view of a hydraulic breaker body showing an embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a conventional example.

[Explanation of symbols]

 22 Upper revolving structure 24 Working part 26 Boom 28 Arm 29 Hydraulic actuator 29A Base end 30 Hydraulic breaker body 31 Bracket 36 First link rod 39 Rod 41 Second link 46A 56A Notch 47 Insert hole 48A Stopper 55 Bucket 55A Rear 56 Mounting shaft 57 Connection bracket (connection receiving part)

Claims (4)

[Scope of utility model registration request] 1. A chisel at a tip of the arm in a working portion of a backhoe for selectively mounting a hydraulic breaker for crushing and a bucket for excavation on a tip end side of an upper swing body via a boom, an arm and a hydraulic actuator. Attach the hydraulic breaker body with the insertion hole of, via the bracket,
A working unit of a backhoe, wherein a mounting shaft that is insertable into the insertion hole is provided on a back surface of the bucket. 2. The working unit of the backhoe according to claim 1, wherein a connection receiving portion for connecting to the bracket is provided on a back surface of the bucket. 3. The bracket is pivotally attached to a distal end of the arm, and further pivotally attached to a distal end of a rod of a hydraulic actuator having a proximal end pivotally attached to the arm via a first link, and The working unit of the backhoe according to claim 2, wherein a second link is provided between the tip and the arm. 4. The working unit of the backhoe according to claim 3, wherein the chisel and the mounting shaft are each provided with a notch in which a stopper to be inserted into the hydraulic breaker body is locked.