JP2003119816A - Quick coupler device of working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quick coupler device in which a pair of pins provided on working arms in such a manner as to freely move in and out are passed through mounting holes in a working device and to surely support the pins against the working arms so that, even if the load of the working device or the like is imposed on the pins while the front ends of the pins protruding from the working arms are connected to the working device, the pins will not be tilted. SOLUTION: The pair of pins are each movable between a protruding position where its front end protruding from its bearing hole is passed through the mounting hole in the working device and inserted into a support hole provided in the working arm and a retracted position where it retracts into the bearing hole. At the protruding position the pin is supported at both its front and rear ends.

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a quick coupler device for a working machine, and more particularly, to a detachable and quick connection of a working device to a working arm of a working machine. To a quick coupler device. 2. Description of the Related Art A hydraulic shovel, which is a typical example of a working machine, for example, has various working devices which are mounted on a tip of an arm which is a working arm via a pin, by replacing the working device with a different one. Work can be performed. For example, excavation and loading of earth and sand by attaching a bucket,
Quarrying and road crushing work by installing a hydraulic breaker, dismantling of structures by installing a crusher,
Each is performed. Therefore, if various working devices such as a bucket, a breaker, and a crusher are appropriately attached and detached and replaced, one hydraulic excavator can be used for multiple purposes and multiple functions. [0003] In this type of working machine, a quick coupler device has been developed and put into practical use, in which a working device can be detachably and quickly connected to a working arm by an operation from a driver's seat. I have. Typical examples of the quick coupler device include, for example, a position where a tip of each of a pair of pins slidably disposed on the working arm is protruded from the working arm and inserted into the working device, and a position where the pin is retracted into the working arm. And a connecting pin structure for moving between them. A specific example of the quick coupler device is disclosed in
-87048. This quick coupler device will be described with reference to parentheses in FIG. 1 of the gazette. In the boss (6) of the arm (1b) as a working arm, the quick coupler device is directed outward in the extending direction. A pair of pins (9, 9) each having a piston (10), and alternately pressurized oil between the pair of pistons (10, 10) and between the pins (9) of each piston (10). The pin (9, 9) moves between a position where its tip protrudes from the end face of the boss (6) and a position where it is retracted into the boss (6). When the pair of pins (9, 9) is positioned at the “projecting position”, the tip of the pin (9) is connected to the pair of bosses (14, 1) of the bucket (1c) as the working device.
4), and the bucket (1c) is connected to the arm (1b). Pin (9, 9) is "retracted position"
, The connection between the arm (1b) and the bucket (1c) is released. [0005] However, the conventional quick coupler device of the above-described embodiment has the following problems to be solved. That is, the pair of pins have a cantilever structure in which the distal ends protrude at the "projected position", and a sufficient supporting length cannot be obtained at the base end structurally. Therefore, the weight of the working device,
When a load or the like is applied to the working device, the base end of the pin tilts in the working arm, and the pin, piston and its bearing hole,
Galling, damage and the like are likely to occur between the sliding hole and the like. When this progresses, oil leakage, sliding failure of the pin, and the like occur. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and a technical problem thereof is to provide a quick coupler device in which a pair of pins are provided on a working arm so as to be freely inserted and removed, and the pins are inserted into mounting holes of the working device. When the tip of the pin protrudes from the work arm and is connected to the work device, even if a load of the work device acts on the pin, the pin must be securely supported on the work arm so that the pin does not tilt. To provide a quick coupler device for a work machine. That is, according to the present invention, as a quick coupler device which solves the above technical problems, a work arm is slidably supported on the same axis so as to approach and separate on the same axis. Each of the paired pins has its tip end projecting outward from the bearing hole, penetrates the mounting hole provided in the working device, and is inserted into the support hole provided in the working arm. Between the "position" and the "retracted position" retracted into the bearing hole by a pin driving means provided on the working arm, and the working device is detachably connected to the working arm. A quick coupler device for a working machine is provided. Then, the tip of the protruding pin is supported,
Both the proximal and distal ends are supported by the working arm, so that the pins are securely supported. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a hydraulic coupler according to a first embodiment of the present invention; FIG. This will be described in further detail. Referring to FIG.
The hydraulic excavator shown by the symbol
An upper revolving unit 6 is mounted on the upper revolving unit 6 so as to be freely rotatable in a horizontal direction. The upper revolving unit 6 is provided with a cab 8 and a front working machine 10. The front working machine 10 includes a boom 10 supported on the upper swing body 6 so as to be swingable in the vertical direction.
a, a boom operating cylinder 10b interposed between the upper swing body 6 and the boom 10a, an arm 10c which is a working arm supported at the tip of the boom 10a so as to be vertically swingable,
An arm working cylinder 10d interposed between the boom 10a and the arm 10c, and a bucket as a working device supported at the tip of the arm 10c via a quick coupler device 12 configured according to the present invention so as to be vertically swingable. 10
e, a bucket link 10f and a bucket working cylinder 10g interposed between the arm 10c and the bucket 10e. The quick coupler device 12 will be described with reference to FIGS. Referring mainly to FIGS. 2 and 4, the quick coupler device 12
c, each of a pair of pins 16, which are slidably disposed on the same axis 15 in a direction approaching and away from the boss 14 at the distal end thereof, respectively move their distal ends from their bearing holes 18, 18. Mounting hole 20 provided in the bucket 10e
"A protruding position (the state shown in FIG. 2)" that penetrates through and is inserted into the support hole 22 provided in the bracket 34 of the arm 10c.
Between the “retracted position (state of FIG. 3)” retracted into the bearing holes 18, 18 by the hydraulic pressure of the pin driving means 24 provided on the upper swing body 6 (FIG. 1) via the arm 10 c. Be moved. The connecting pin structure 12 including the pair of pins 16 and 16 is formed substantially symmetrically in the direction of the axis 15 (the left-right direction in FIG. 2). The boss 14 has a pair of piston sliding holes 14a, 14a extending in the direction of the axis 15 in the inner diameter portion, and the central portion is communicated by a communication hole 14b. A cylindrical bearing 26 and a seal 28 are attached to the outside of each of the piston sliding holes 14a, 14a.
Further, the extension side pipe 30 of the pin driving means 24 is connected to the communication hole 1.
4b, the contraction side pipe 32 is provided with the piston sliding holes 14a, 14a.
a Each is connected to the bearing 26 side end. The arm 10c is further provided with brackets 34, 34 integrally with a predetermined width outward of the respective piston sliding holes 14a, 14a in the direction of the axis 15, and the bracket 34 has A bearing 36 substantially identical to the bearing 26 described above is mounted. The bearing 36 forms the support hole 22 that supports the tip of the pin 16 at the above-mentioned “projected position”. The boss 14 and the bracket 34 are formed integrally with the arm 10c by welding steel members to each other. It may be formed integrally with a steel casting or the like. The pin 16 is formed of steel and has a bearing hole 1.
A pin 16a, which is a main part slidably formed in the support hole 8 and the support hole 22, and a piston slide hole 14a having a diameter larger than that of the pin 16a and sliding toward the inner end in the direction of the axis 15. And a freely formed piston portion 16b. The mounting hole 20 of the bucket 10e is provided on a boss 40 mounted on each of the pair of brackets 38, 38 on the same axis 41 (FIG. 4). The distance between the pair of bosses 40 and 40 in the direction of the axis 41 and the width of the bosses 40 and
It is formed so that it can be inserted and removed between them. The diameter of the mounting hole 20 is substantially the same as the diameter of the bearing hole 18 and the support hole 22. The pin driving means 24 is provided in the piston sliding hole 14.
a hydraulic control device 4 provided in the upper revolving unit 6 (FIG. 1) for supplying and discharging pressure oil to a and sliding the pin 16 in the direction of the axis 15.
2, the hydraulic control device 42 and the piston sliding hole 14a,
14a and the above-mentioned extension side pipe 30 and contraction side pipe 3
2 is provided. The hydraulic control unit 42 will be described with reference to FIG. The hydraulic control device 42 includes a two-position electromagnetic switching valve 48 for switchingly connecting the expansion side pipe 30 and the contraction side pipe 32 to a hydraulic pump 44 or an oil tank 46 as a hydraulic pressure source,
And an electric switch 50 for switching the operation. A pipeline 52 connecting the hydraulic pump 44 and the electromagnetic switching valve 48
In order to maintain the oil pressure supplied to the piston slide hole 14a at a predetermined pressure, a check valve 56 for stopping backflow in the direction of the accumulator 54 and the hydraulic pump 44, a pressure switch 58, a relief valve 60, an open / close When the pressure of the accumulator 54 reaches a predetermined pressure, the discharge oil of the hydraulic pump 44 is released to the oil tank 46 by the on-off valve 62, and the predetermined pressure is maintained. A pair of pins 16 in the quick coupler device 12 configured as described above with reference to FIGS.
The operation of the 16 to the “projection position” and the “retraction position” and the attachment / detachment of the bucket 10 e as the working device will be described. (1) Pin "projecting position" (FIG. 2): A pair of mounting holes 2 of the bucket 10e in a state where the pins 16, 16 of the arm 10c are pulled into the boss 14 (FIG. 3).
0 and 20 are respectively positioned between the bearing hole 18 and the support hole 28 of the arm 10c, and the electric switch 50 of the hydraulic control device 42 of the pin driving means 24 is turned on to turn on the electromagnetic switching valve 4
8, the pressure oil of the hydraulic pump 44 is supplied to the head side pipe 30, and the rod side pipe 32 is released to the tank 46.
By doing so, the pair of pins 16, 16 slides outward on the axis 15, respectively, and their respective tips pass through the mounting holes 20 of the bucket 10 e and are inserted into the support holes 22 of the bracket 34, Bucket 10e is connected to arm 10c. At this time, the pair of pins 16, 16 are urged and held at the "projected position" by the hydraulic pressure defined by the operation of the accumulator 54 and the pressure switch 58 of the hydraulic control device 42. (2) Pin “retracted position” (FIG. 3): At the “pin protruding position” (FIG. 2) where the above-described bucket 10e is connected to the arm 10c, the electric switch 50 of the hydraulic control unit 42 is turned off to turn off the electromagnetic force. When the switching valve 48 is switched to supply the pressure oil of the hydraulic pump 44 to the rod-side pipe 32 and the head-side pipe 30 is released to the oil tank 46, the pair of pins 16
16 slide inward on the axis 15, respectively, and each of the distal ends thereof supports the support hole 22 of the bracket 34 and the bucket 1.
It is pulled out from the mounting hole 22 of 0e and is drawn into the bearing hole 18. Thus, the connection between the bucket 10e and the arm 10c is released. At this time, the pair of pins 16, 16 are urged and held at the “retracted position” by the hydraulic pressure defined by the operation of the accumulator 54 and the pressure switch 58 of the hydraulic control device 42. The quick coupler device 12 as described above
The operation of will be described. (1) The pins are securely supported. At the “projected position (FIG. 2)” where the pair of pins 16 and 16 are connected to the bucket 10 e, the tip ends pass through the mounting hole 20 of the bucket 10 e and are inserted into the support hole 22 of the bracket 34 of the arm 10 c. The pin 16 has a double-supported structure in which one end is supported by the bearing hole 18 and the other end is supported by the support hole 22. Therefore, the support strength of the pin 16 is improved, and the pin 16 is hardly inclined even when a weight, load, or the like of the bucket 10e acting as a working device acts, and the pin 16 is securely supported by the arm 10c serving as a working arm. (2) Leaks and pin sliding defects are eliminated:
Therefore, the inclination of the pin 16 is prevented.
Between the sliding hole 14a, the bearing hole 18 and the like,
Problems such as damage, resulting oil leakage, and problems with pin sliding are also eliminated. As described above, the present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments. It can be modified or modified. (1) Pin driving means: In this embodiment, the pin driving means 24 directly supplies and discharges hydraulic oil to and from the pair of pins 16, 16. Alternatively, means such as a rack gear may be connected, and driving means such as a fluid pressure cylinder, a fluid pressure or electric motor may be connected thereto. (2) Working arm: In this embodiment,
The quick coupler device 12 has an arm 10c as a working arm.
The bucket link 10 shown in FIG.
It can be appropriately used for an arbitrary portion such as a connection portion between f and the bucket 10e. According to the quick coupler device constructed in accordance with the present invention, there is provided a quick coupler device in which a pair of pins are provided on a working arm so as to be freely inserted and removed, and the pins are inserted into mounting holes of the working device. In the state where the tip of the pin protrudes from the arm and is connected to the working device, even if a load of the working device acts on the pin, so that the pin does not tilt,
Provided is a work machine quick coupler device that can reliably support a pin on a work arm.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a hydraulic shovel, which is a typical work machine, provided with a work machine quick coupler device configured according to the present invention. FIG. 2 is an enlarged cross-sectional view taken along a line AA of FIG. 1 and indicated by a pin “projection position”. FIG. 3 is an enlarged cross-sectional view taken along a line AA of FIG. 1 and indicated by a pin “retracted position”; FIG. 4 is an enlarged perspective view showing a portion of the quick coupler device of FIG. 1 in a direction of an arrow B and showing an arm serving as a working arm and a bucket serving as a working device in a state where a pin “pull-in position” is separated. FIG. 5 is a hydraulic circuit diagram of a pin driving unit. [Description of Signs] 2: Hydraulic excavator (working machine) 10c: arm (working arm) 10e: bucket (working device) 12: quick coupler device 15: axis 16: pin 18: bearing hole 20: mounting hole 22: support hole 24: Pin driving means

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Takahiro Iwamoto             4-10-1, Yoga, Setagaya-ku, Tokyo             Yatapillar Mitsubishi Corporation F-term (reference) 2D012 HA05                 2D015 AA01                 3J105 AA02 AA03 AA04 AA13 AA14                       AB48 AC02 BA06 BA16 BB14                       BB17 BB33

Claims (1)

Claims 1. A pair of pins slidably supported on a working arm so as to approach and separate from each other on the same axis, and each of the pins has its tip end outward from a bearing hole. A position between a “projection position”, which is protruded and penetrates a mounting hole provided in the working device and is inserted into a support hole provided in the working arm, and a “retraction position” retracted into the bearing hole. A quick coupling device for a working machine, wherein the working device is moved by pin driving means provided on the working arm, and the working device is detachably connected to the working arm.