JP3002871B2 - Attachment actuator for work equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom and an arm. Attachments such as a bucket and a pile driver are detachably connected to a front provided on a main body of a working machine.
The present invention also relates to an attachment operating device for a working machine that can be rotated left and right to tilt.

[0002]

2. Description of the Related Art For example, when a vertical excavation work is performed by a working machine such as a hydraulic excavator, if a scaffold at a work site is inclined and a working machine body is also inclined, a groove to be excavated is also inclined. Problem. In some cases, the work implement body performs an operation of excavating a subgrade or the like on a slope by tilting a bucket while the work implement body is positioned on a flat scaffold. Therefore,
Conventionally, a tilt device having a pair of hydraulic cylinders is provided between the distal end side of the arm and the attachment as a mechanism for tilting the attachment by rotating it in the left-right direction (tilt), and by moving the piston of each hydraulic cylinder forward and backward. An attachment in which the attachment is inclined rightward or leftward is known. There is also known a working machine in which the work machine body is rolled with respect to a vehicle body so that the work can be performed with the attachment in a vertical state or an inclined state.

[0003]

However, the above-mentioned conventional tilt device has a structure in which a pair of hydraulic cylinders are provided in a substantially C shape between the arm and the attachment, so that the lateral width of the attachment becomes large. Therefore, there is a drawback that excavation work with a narrow width cannot be performed and a drawback that the weight increases. Also, the hydraulic cylinder is protruding from the attachment, and the operating range of the front is restricted in order to avoid interference with the work equipment,
There is a disadvantage that the exposed hydraulic cylinder is damaged by rocks dropped from a bucket or the like during work. On the other hand, the mechanism for rolling the working machine body is a special vehicle, and has the disadvantage of being extremely expensive.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and uses a single hydraulic cylinder, so that the structure is small, it can be manufactured at low cost, and the attachment and detachment operation of the attachment can be performed. An object of the present invention is to provide an attachment operating device for a working machine that can be easily and firmly connected, and that can protect a hydraulic cylinder from an external force.

[0005]

According to a second aspect of the present invention, there is provided a work implement having a fixed operating member detachably provided at a front end of a working machine, the connecting operation body having a fixed shaft support, and A rotation support member having an attachment engaging portion and an interlocking shaft support portion, the rotation support member being rotatably supported by the base member so as to be rotatable in the left-right direction, and protruding forward from the rotation support member. A retaining bolt, and an attachment operating mechanism that has one hydraulic cylinder and drives the rotary support to rotate in the left-right direction with respect to the base;
An attachment detachably connected to the connection operating body is a connection comprising a fitting connection part in which an attachment engaging part of the rotation support is detachable, and a bolt insertion hole into which the retaining bolt is inserted. It is provided with a receiving part.

The attachment engaging portion is formed in a flat plate, and both end surfaces in the width direction are formed on upward engaging surfaces inclined in a substantially C shape, and the attachment receiving portion is provided on the connection receiving portion. It is preferable that a downwardly-facing engagement surface that is inclined in a substantially C-shape and that engages with the engagement surface is formed.

The attachment actuating mechanism is pin-connected between one hydraulic cylinder whose base end is pivotally supported in a state of being disposed in the recess of the base, and a piston tip of the hydraulic cylinder and the fixed shaft support. And an interlocking arm pin-connected between the driving arm and the interlocking shaft support.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the figure, reference numeral 1 denotes a connecting and operating member which is detachably provided at the distal end of an arm A ₁ and a link A ₂ which constitute a front A of a working machine. Reference numeral 2 denotes a base constituting the connection operating body 1 and made of a steel material. 3 is the substrate 2
A bottom plate 3 having a substantially rectangular planar shape, a pair of pin holes 4A, 4A on both front and rear sides of the bottom plate 3 in the width direction, and a one-side vertical plate 4 having a connecting piece loose fitting hole 4B substantially in the center; A pair of pin holes 4A, 4A, a pair of pin holes 5A, 5A coaxial with the other side vertical plate 5 having a piston loose fitting hole 5B substantially at the center is erected and opposed to each other. By connecting a pair of front and rear plates 6 and 6 (only the rear plate 6 is shown) between the base plate 2 and the base plate 5, the base 2 has a recess 2A above the bottom plate 3.

A pair of brackets 7, 7 protrude from the outer surface of the one-side vertical plate 4, and a pair of fixed shaft supports 8, 8 diagonally downward from the outer surface of the other-side vertical plate 5.
Is protruding. Reference numerals 9 and 9 denote a pair of connecting plates having pin holes 9A formed coaxially in the front-rear direction.
Is protruded from the rear end side so as to face downward.
The base 2 having the above-described configuration is connected to the connection pins 10 and 1.
0 detachably connects to the arm A ₁ and the link A ₂ so as to rotate in the front-rear direction.

Reference numeral 11 denotes a rotating support that is rotatably supported on the connecting plates 9 and 9 of the base 2 so as to be rotatable left and right. Reference numeral 12 denotes an attachment fixing plate constituting the rotating support 11, and FIG.
The attachment attachment plate 12 has a rear end 12A as shown in FIG.
It is formed of a flat plate having a substantially trapezoidal shape and narrowed from the side toward the front end 12B, and both end surfaces in the width direction are formed as upward engaging surfaces 12C, 12C inclined in a substantially C shape. 13, 14
Is a pair of fixing plates erected on the upper surface of the attachment engaging plate 12 so as to be separated from each other in the front and rear directions. The fixing plates 13 and 14 are formed with coaxial pin insertion holes 13A and 14A.

Reference numeral 15 denotes an interlocking shaft supporting portion which is positioned between the pair of fixing plates 13 and 14 and is erected on the attachment engaging plate 12 and slightly projects rightward in the front view. Is formed with a pin insertion hole 15A. 1
Reference numerals 6 and 16 denote a pair of retaining bolts, each of which is welded to the front surface of the front fixing piece 13 and the upper surface of the attachment engaging plate 12 so that the distal end 16 is secured.
A is in a state of protruding forward from the front end 12B of the attachment engaging plate 12. The rotation support 11 having the above-described configuration is rotatable with respect to the base 2 by the support shaft 17 integrally inserted into the pin holes 9A of the pair of connecting plates 9 and the pin holes 13A and 14A of the fixing plates 13 and 14. Connected.

Reference numeral 21 denotes a hydraulic operating mechanism. Reference numeral 22 denotes the hydraulic actuating mechanism 21 which is disposed in the recess 2A of the base 2.
The hydraulic cylinder 22 is connected to the brackets 7, 7 of the base body 2 by pins 23 in a state where the pin connecting portion 22A on the base end side penetrates the connecting piece loose fitting hole 4B, and the piston rod 22B is It is in a state of protruding outside the other vertical plate 5 through the loose fitting hole 5B. 24, 24
Is a drive arm, and each drive arm 24 is rotatably pin-connected between the fixed shaft supports 8, 8 of the base 2 and the distal end side of the piston rod 22B by connecting pins 25, 26. Reference numerals 27, 27 denote a pair of interlocking arms. One end of each interlocking arm 27 is connected to the drive arm 24 via the connection pin 26, and the other end is connected to the interlocking shaft support 15 via the connection pin 28. I have.

Thus, the hydraulic operating mechanism 21 according to the present embodiment comprises a hydraulic cylinder 22 supported by the base 2, a drive arm 24 pin-connected between the hydraulic cylinder 22 and the base 2, Interlocking arm 2 pin-connected between attachment support plate 12 of rotation support 11 and pin
7. The hydraulic cylinder 22 is connected to a hydraulic pump mounted on a working machine for operating the front A, the bucket C, and the like, and is configured to operate by an operation from an operator's cab.

The coupling operating body 1 has the above-described structure. Next, a coupling receiving portion 3 provided on a bucket C as an attachment is provided.
1 will be described. In the figure, reference numeral 32 denotes the connection receiving portion 3
1 constitute, in fitting connecting portion provided in the upper plate C ₁ bucket C, fitting coupling portion 32 and the front support plate 33 erected on the front edge of the upper C _1, the front-side support plate 33 Yes constructed from upright the pair of left and right lateral support plate 34, 34 Metropolitan substantially V-shape when viewed in the upper C ₁ from the plane and front in a state of abutting the tip, each of said lateral support plate The inner side surface of 34 is a downward engaging surface 34A inclined in a substantially C shape. Thus, the attachment engaging plate 12 is removably fitted between the front support plate 33 and the pair of lateral support plates 34, 34, and the engagement surface 1
2C and 12C are adapted to abut against the downwardly engaging surfaces 34A of the lateral support plates 34 and 34, respectively. Reference numerals 35, 35 denote bolt insertion holes formed in the front support plate 33. Each of the bolt insertion holes 35 has a retaining bolt 16 of the rotary support 11,
16 is inserted and fastened by a nut 36.

The attachment operating device for a working machine according to the present embodiment is roughly composed of the connecting operating body 1 connected to the front A side and the connecting receiving portion 31 provided on the bucket C side as roughly described above. Next, the operation will be described. When connecting the coupling operating body 1 to the bucket C, the front A is actuated to the bucket C placed on the ground so that the coupling operating body 1 approaches from behind, and the attachment engaging plate 12
Into the fitting connection portion 32, and each retaining bolt 1
6 is inserted into the bolt insertion hole 35, and the nut 36 is screwed. In these operations, attachment attachment plate 12
Is formed so as to be tapered from the rear end 12A toward the front end 12B, so that the operation of fitting into the fitting connection portion 32 can be easily performed. Both end surfaces in the width direction of the attachment engaging plate 12 are formed as upward engaging surfaces 12C, 12C, and the inner side surface of the lateral support plate 34 of the fitting connecting portion 32 is formed with each engaging surface 12C.
C is formed on the downward engaging surface 34A that engages with C.
The rotation support 11 and the bucket C can be firmly connected together with the fastening by the retaining bolts 16 and the nuts 36.

To tilt the bucket C connected to the front A to the left as viewed from the rear side of the cab, as described above, the piston rod 22B of the hydraulic cylinder 22 is retracted as shown in FIG. In conjunction with this, the drive arm 24
Is rotated clockwise in the figure and pushes the interlocking arm 27 downward. As a result, the attachment holding plate 12 can be rotated counterclockwise about the support shaft 17 and tilted to the left.

On the other hand, to tilt the bucket C to the right, FIG.
As shown in the figure, the piston rod 22B of the hydraulic cylinder 22
Is extended, the drive arm 24 rotates counterclockwise about the connection pin 25. In conjunction with this, interlocking arm 2
As a result, the attachment engaging plate 12 can be rotated clockwise about the support shaft 17 and tilted to the right.

In this embodiment, the bolt insertion hole 35 is used.
Is set to an inner diameter in which the retaining bolt 16 can be inserted, but the hole diameter of the bolt insertion hole 35 is set to be about twice as large as the diameter of the retaining bolt 16, and the retaining bolt 16 is inserted into the bolt insertion hole 35. It is preferable that the washer is fitted after the is inserted. By doing so, when the retaining bolt 16 is inserted into or removed from the bolt insertion hole 35, it is possible to reliably prevent a situation in which the thread of the retaining bolt 16 hits the inner surface of the bolt insertion hole 35 and breaks and is damaged. .

[0019]

The present invention has the following advantages because it is constructed as described above. (1) Since the attachment is configured to operate with one hydraulic cylinder, it can be configured as a compact and lightweight device, and has excellent operability since it does not interfere with the attachment or the front during operation. In addition, it can be manufactured at a lower price compared to the prior art. (2) The work of connecting the attachment to the front also requires only fitting the attachment engaging part to the connection receiving part provided on the attachment, inserting the retaining bolt into the bolt insertion hole and tightening with the nut. The attachment / detachment work is simple and can be performed in a short time, and the workability is excellent. (3) The attachment engaging portion is formed in a flat plate, and both end surfaces in the width direction are formed on upward engaging surfaces inclined in a substantially C shape, and the attachment receiving portion of the attachment is engaged with the attachment engaging portion. Since the downward engaging surface that is inclined in a substantially C-shape that is engaged with the mating surface is formed, the front side and the attachment side can be easily and firmly connected. (4) Since the first hydraulic cylinder is arranged in the concave portion of the base,
Even when rock or the like falls from an attachment such as a bucket during work, it is possible to reliably prevent a situation in which the rock or the like directly hits the hydraulic cylinder and is damaged.

[Brief description of the drawings]

FIG. 1 is a rear view showing a state in which an attachment operating device for a working machine according to an embodiment of the present invention is connected to a bucket.

FIG. 2 is a left side view of the attachment operating device for a working machine.

FIG. 3 is a right side view of the attachment operating device for a working machine.

FIG. 4 is a perspective view of a rotating support.

FIG. 5 is a plan view of a connection receiving portion.

FIG. 6 is a rear view of the connection receiving portion.

FIG. 7 is an explanatory diagram of a state where the bucket is tilted left as viewed from the rear surface.

FIG. 8 is an explanatory diagram of a state where the bucket is inclined rightward when viewed from the rear side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection operation body 2 Base 8 Fixed shaft support 11 Rotation support 12 Attachment engaging plate 12C Upward engagement surface 15 Interlocking shaft support 16 Retaining bolt 21 Hydraulic operation mechanism 22 Hydraulic cylinder 24 Drive arm 27 Interlock arm 31 Connection receiver 32 Fitting connection part 34A Downward engaging surface 35 Bolt insertion hole A Front C bucket

Claims (3)

(57) [Claims] A connecting operation body detachably provided at a front end of a work machine has a fixed shaft support, and has a base pin-connected to the front, an attachment engaging portion, and an interlocking shaft support. A rotating support rotatably supported on the base so as to be rotatable in the left-right direction, a retaining bolt protruding forward from the rotating support, and one hydraulic cylinder; A hydraulic actuating mechanism that is driven to rotate in the left-right direction with respect to the base body, and an attachment that is detachably connected to the connection operating body is detachably fitted with an attachment engaging portion of the rotating support. An attachment operating device for a working machine, comprising a connection receiving portion comprising a connection portion and a bolt insertion hole into which the retaining bolt is inserted. 2. The attachment engaging portion is formed as a flat plate, and both end surfaces in the width direction are formed on upward engaging surfaces inclined in a substantially C shape, and the attachment receiving portion is provided on the connection receiving portion. The attachment operating device for a working machine according to claim 1, wherein a downward engaging surface inclined in a substantially C shape is formed to engage with the engaging surface of (1). 3. A hydraulic cylinder having a base end pivotally supported in a state in which the hydraulic operating mechanism is disposed in a recess of the base;
A drive arm pin-connected between the piston tip of the hydraulic cylinder and the fixed shaft support portion, and an interlocking arm pin-connected between the drive arm and the interlocking shaft support portion. The attachment operating device for a working machine according to claim 1.