JP2008196275A - Attachment connection device and working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attachment connection device without interrupting a transparent window by an operation part of an operation lever and a working machine installed with the attachment connection device. <P>SOLUTION: An attachment connection device 22 is mounted to the front edge of a work device of a working machine. The attachment connection device 22 is provided with the transparent window 27 capable of seeing through forward at a main body of a connection device 28. A connection mechanism 31 capable of detaching and attaching an attachment by the rotation of operation lever 30 which is supported facing the transparent window 27 is arranged. The connection mechanism 31 is provided with a rotating zone restricting means of the operation lever which makes an operation part 29 of the operation lever 30 to rotate only in an upper area of the transparent window 27. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an attachment coupling device that allows an attachment to be exchanged, and a work machine including the attachment coupling device.

  As shown in FIG. 8, the wheel loader type work machine 1 is configured such that attachments such as various buckets and forks can be attached and detached by an attachment connecting device 4 provided at the tip of the work device 3 installed in the machine body 2. Has been.

In the attachment connecting device 4 of this type of work machine 1, the upper portion of the connecting device main body 5 is hooked on an engagement plate provided on the upper portion of the attachment (not shown), and the operation lever provided at the lower portion of the connecting device main body 5 is rotated. Is provided with a coupling actuator that slides in the lateral direction. Then, by attaching the coupling actuating body to the corresponding position of the attachment, the attachment connecting device 4 and the attachment can be integrated, and various attachments such as forks and buckets can be exchanged according to the use. (For example, refer to Patent Document 1).
Japanese Patent Laying-Open No. 2005-90197 (page 3, FIG. 5)

  In such an attachment coupling device 4, the see-through window 6 provided in the coupling device main body 5 is blocked by the operation portion 8 of the operation lever 7, so that the tip position of the attachment fixed to the attachment coupling device 4 cannot be confirmed. .

  For example, as shown in FIG. 9, there has been proposed one that operates the attachment / detachment between the attachment and the attachment coupling device 4 by an operation lever 7 that is rotated to a horizontal position. When the fork 9 is attached as an attachment because it is blocked by the operating portion 8 of the lever 7, the fork tip position cannot be confirmed.

  The present invention has been made in view of the above points, and uses an attachment coupling device that can ensure forward visibility without blocking the see-through window by the operation portion of the operation lever of the coupling mechanism, and the attachment coupling device. The purpose is to provide a working machine.

  The invention described in claim 1 is attached to the distal end of the work arm and has a see-through window that can be seen through the front, and a connecting device body that is provided in the connecting device body and is pivotally supported facing the see-through window. A connection mechanism that can attach and detach the attachment by rotating an operation lever having an operation portion, and the operation portion of the operation lever of the connection mechanism is an attachment connection device that rotates in a region above the see-through window.

  According to a second aspect of the present invention, in the attachment coupling device according to the first aspect, the coupling mechanism includes an operation lever rotation area regulating means for rotating the operation portion of the operation lever in a region above the see-through window. Is.

  According to a third aspect of the present invention, there is provided the attachment coupling device according to the first or second aspect, wherein the coupling mechanism is interlocked with the operation lever so that the one side and the other side of the coupling device main body sandwich the transparent window. In addition, it is provided with a coupling actuating body that is slidably attached to and detached from the attachment by sliding in the vertical direction.

  According to a fourth aspect of the present invention, in the attachment coupling device according to any one of the first to third aspects, the coupling mechanism includes a spring that urges the operation lever toward the coupling device main body to suppress rotation. Is.

  The invention described in claim 5 is a machine body, a lift arm pivotally supported by the machine body so as to be pivotable in the vertical direction, and a pivot arm pivotally supported by the tip of the lift arm. A work machine comprising the attachment coupling device according to any one of the above and an attachment coupled to the attachment coupling device.

  According to the first aspect of the present invention, the operation portion of the operation lever of the connection mechanism for attaching and detaching the connection device main body and the attachment can be rotated only in a region above the see-through window. It can be prevented from being blocked by the lever operating portion, and the visibility of the front situation can be improved.

  According to the second aspect of the present invention, the operation portion of the operation lever can be rotated only above the see-through window by the operation lever turning region restricting means, and the see-through window is blocked by the operation portion of the operation lever. Can be surely prevented.

  According to the invention described in claim 3, by sliding the combined operating body up and down, the weight of the combined operating body also acts in the fixing direction at the time of fixing. In the coupling mechanism in which the coupling operating body slides in the lateral direction, at least a part of the see-through window is blocked, but the coupling actuating body slides in the up-down direction with the attachment plates at both ends sandwiching the see-through window of the coupling device body. With the moving coupling mechanism, the coupling actuator can be slid without blocking the see-through window.

  According to the fourth aspect of the present invention, the coupling mechanism is provided with the spring for urging the operating lever toward the coupling device main body, whereby friction is applied to the operating lever urged by the spring. Since the rotation of the attachment can be suppressed, the attachment / detachment position can be stably maintained, the attachment / detachment operability of the attachment can be improved, and the attachment can be prevented from dropping off during work.

  According to the invention described in claim 5, in the working machine that works with the attachment provided via the lift arm and the attachment coupling device, the visibility of the front state of the attachment coupling device can be improved. It is possible to work efficiently while confirming the front of the attachment during work, and workability can be improved.

  Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS.

  FIG. 6 shows a wheel loader as the work machine 11, and the work machine 11 includes a body 12, a cab 13 is mounted on the body 12, and a fork installed on the body 12 in front of the cab 13. A working device 14 used for work or bucket work is provided.

  The fuselage 12 is connected to a rear vehicle 16 having a rear wheel 15 and a front vehicle 18 having a front wheel 17 so as to be swingable in the left-right direction with an unillustrated articulate shaft as a fulcrum. This is a structure that is bent by an articulating cylinder (not shown) provided between the partial vehicle 18 and the vehicle.

  The work device 14 is installed on the front vehicle 18, and a base end of a lift arm 21 as a work arm is rotatable on a pair of arm mounting brackets 19 provided integrally with the front vehicle 18. An attachment coupling device 22 is pivotally supported at the ends of the lift arms 21 so that the attachments such as forks and buckets (not shown) are coupled through the attachment coupling device 22 with one touch.

  The working device 14 includes a lift cylinder 21 that is lifted and lowered by a lift cylinder 23 that is axially coupled between each arm mounting bracket 19 and each lift arm 21, and a tilt cylinder 24 that is pivotally supported on the front vehicle 18. Thus, the attachment connecting device 22 and the attachment are tilt-rotated via the tilt lever 25 pivotally supported between the pair of lift arms 21 and the rod 26 pivotally connected to the lower end of the tilt lever 25. Is done.

  As shown in FIGS. 1 to 3, the attachment coupling device 22 is attached to the tip of the lift arm 21 and is provided with a coupling device main body 28 having a see-through window 27 that can be seen through the front, and this coupling device main body 28. Is provided with a connecting mechanism 31 that is pivotally supported facing the see-through window 27 and that allows attachment / detachment of the attachment A by rotation of an operation lever 30 having an operation portion 29.

  The coupling device main body 28 is mainly provided between the left and right ends of a pipe-like upper frame member 32 and lower frame member 33, a central bracket 34 provided between the centers of the upper frame member 32 and lower frame member 33, and A hollow structure constituted by the bracket 35 and the mounting plate 36 thus formed, and this hollow portion becomes the see-through window 27.

  The central bracket 34 is provided with a rod boss 37, and a tip of the tilt rod 26 is rotatably connected by a pin (not shown) inserted into the rod boss 37.

  As shown in FIG. 3, the attachment plates 36 at both ends are plate members that receive the attachment main body A1 of the attachment A, and an upper portion of the attachment plate 36 is connected to an engagement plate A2 provided at the upper portion of the attachment A. The engaging member 38 to be engaged is fixed by welding. And the slope part 39 contact | abutted by the lower slope part A3 of the attachment main-body part A1 of the attachment A is bend-formed in the lower part of the attachment plate 36 of these both ends, and the fork A4 is formed in the lower part of the attachment A. Is formed.

  As shown in FIG. 1, a cylindrical joint operating member guide member 41 having upper and lower ends opened is fixed to the inclined surface portion 39 by welding, and lift arms are attached to the lower inner portions of the left and right brackets 35. A lift arm bracket 42 for connecting the tip of 21 is provided. The lift arm bracket 42 is provided with a lift arm boss 43, and a tip of the lift arm 21 is rotatably connected by a pin (not shown) inserted into the lift arm boss 43.

  In the coupling mechanism 31, left and right coupling actuating body guide members 41 are fitted with coupling actuating bodies 44 that are detachable from the attachment A so as to be movable up and down. On the other hand, the operating lever 30 is rotated around the shaft member 45 by the operating portion 29, and a convex portion 46 is integrally projected in the direction of a predetermined angle with respect to the operating portion 29. And the connecting member 47 are connected by the pin 48, and the connecting member 47 and the coupling operating body 44 are connected by the pin 49, so that the coupling operating body 44 slides in the vertical direction in conjunction with the rotation of the operation lever 30. As shown in FIG. 5, the fixed claw 51 provided at the lower portion of the coupling operating body 44 is fitted into the fixed claw insertion hole A6 formed in the lower slope portion A3 of the attachment A and the lower reinforcing member A5. It is configured to be removed.

  A spring 52 is fitted to the connecting member 47, and one end of the spring 52 is locked by a pin 50 fitted to the connecting member 47, and the other end of the spring 52 is engaged with the convex portion 46 of the operation lever 30. Locked by the combined washer 53, the washer 53 is pressed against the convex portion 46 by the spring 52, and the operation lever 30 is moved between the solid line as the lower limit position and the two-dot chain line as the upper limit position shown in FIG. Hold stable in position.

  As shown in FIG. 4, the shaft support structure of the operation lever 30 is fixed to the mounting plates 36 at both ends of the coupling device main body 28 by attaching welding members 54 for mounting the operation lever 30 to the mounting members 54. The operation lever 30 is pivotally supported by the fitted shaft member 45 so as to be rotatable.

  Further, a spring 55 is fitted to the shaft member 45 for mounting the operation lever 30 and a spring receiver 56 that receives one end of the spring 55 is engaged. The spring 55 connects the operation lever 30. By biasing toward the device main body 28 side, the operating lever 30 is pressed against the receiving member 57 interposed between the mounting member 54 and friction is applied to the operating lever 30, and the rotation of the operating lever 30 can be suppressed. Thus, the position of the coupling operating body 44 at the time of desorption is stably held.

  Further, the connecting device main body 28 is also provided with an operation lever rotation area restricting means 58 for rotating the operation portion 29 of the operation lever 30 in the region above the see-through window 27.

  The operating lever rotation area restricting means 58 is configured such that a locking portion 59 is provided on the mounting member 54, and an engaging member 60 that engages with the locking portion 59 is integrally fixed to the operating lever 30 by welding or the like. By locking the engaging member 60 of the operating lever 30 by the locking portion 59, the operating lever 30 is locked within a certain rotation range, as shown in the lower limit position and the upper limit position in FIG. In addition, the rotation range of the operation portion 29 of the operation lever 30 is restricted above the see-through window 27 so that the operation portion 29 does not block the see-through window 27.

  As shown in FIG. 5, a slope part 39 for improving the attachment / detachment ease of the attachment A is provided at the lower part of the mounting plate 36 of the coupling device main body 28, and the coupled operating member guide member provided on the slope part 39. A fixing claw 51 fitted into and removed from the fixing claw insertion hole A6 of the attachment A through the opening at the lower end of 41 is engaged with the fixing claw insertion hole A6 of the attachment A so that the attachment A can be securely fixed. The engaging surface 61 is formed obliquely so as to be perpendicular to the inclined surface portion 39.

  Further, a grease nipple 62 is provided on a side portion of the coupling actuating body guide member 41, and the sliding of the coupling actuating body 44 is facilitated by the grease supplied from the grease nipple 62.

  Next, the operation and effect of the embodiment will be described.

  When operating the working device 14 to connect the attachment A, the engaging member 38 of the connecting device main body 28 is hooked on the engaging plate A2 of the attachment A, and the inclined surface portion 39 is brought into close contact with the corresponding surface of the attachment A. In this state, the operation portion 29 of the operation lever 30 is rotated to the lower limit position shown in FIG. 1 so that the coupling operating body 44 is inserted into the attachment A, and the attachment A and the attachment coupling device 22 are integrated.

  When replacing the attachment A connected to the attachment connecting device 22, the work device 14 is operated, the attachment A is lowered to the ground, and the operating portion 29 of the operating lever 30 is rotated to the upper limit position shown in FIG. Let As a result, the coupling actuating body 44 rises in conjunction with the operation lever 30, and when it is detached from the attachment A, the working device 14 is operated to remove the engagement member 38 of the coupling device main body 28 from the engagement plate A2 of the attachment A. Attachment A and attachment connecting device 22 are separated and connected again as described above.

  FIG. 7 shows a state in which the fork A4 is attached and the fork A4 is raised, but the see-through window 27 is not obstructed by the operation portion 29 of the operation lever 30, and the fork tip position A7 can be confirmed through the see-through window 27. As a result, fork work such as insertion into a pallet can be performed efficiently while confirming the fork tip position A7.

  As described above, in the work machine 11 in which the lift arm 21 as the work arm is attached to the machine body 12 and the work machine 11 is operated by the attachment A connected to the attachment connection device 22 provided at the tip thereof, the attachment A and the attachment connection device A connecting mechanism 31 for detachably connecting to the connecting device 22 is provided in the connecting device main body 28, and the operating portion 29 of the operating lever 30 of the connecting mechanism 31 can be rotated only in the region above the see-through window 27 of the connecting device main body 28. As described above, since the rotation area is restricted by the operation lever rotation area restriction means 58, the see-through window 27 is not blocked by the operation portion 29 of the operation lever 30 of the coupling mechanism 31, and the visibility of the front situation can be improved. .

  Moreover, since work can be efficiently performed while confirming the front of the attachment A during work, workability can be improved.

  The coupling actuating body 44 is slid up and down by the mounting plates 36 sandwiching the see-through window 27 of the coupling device main body 28 so that the attachment A and the attachment coupling device 22 are fixed. 44's own weight also acts in the fixing direction, so it can be fixed more stably.

  Furthermore, in the conventional coupling mechanism in which the coupling operating body slides in the lateral direction, the see-through window is blocked by the coupling operating body and the operating portion of the operation lever, but the coupling operating body 44 slides in the vertical direction. In the coupling mechanism 31, the coupling mechanism 31 such as the operation lever 30 and the coupling actuating body 44 is mounted in the mounting plate 36, and the coupling actuating body 44 slides in the vertical direction on the mounting plate 36. The visibility of the front situation can be improved without the transparent window 27 being blocked by the 30 operation units 29.

  By providing the connecting mechanism 31 with a spring 55 that urges the operating lever 30 toward the connecting device main body 28, the operating lever 30 is pressed against the receiving member 57 by the spring 55, and friction is applied to the operating lever 30. Since the rotation of the operation lever 30 can be suppressed, and the attachment / detachment position of the coupling actuator 44 can be stably maintained, the attachment / detachment operability of the attachment A can be improved, and the attachment can be removed by pulling out the coupling actuator 44 during work. Can be reliably prevented.

  The present invention is applicable to an attachment connecting device for connecting attachments such as various buckets and forks, and a work machine such as a wheel loader or a hydraulic excavator provided with the attachment connecting device at the tip.

It is a front view which shows one Embodiment of the attachment coupling device which concerns on this invention. It is a top view of an attachment coupling device same as the above. It is a side view of an attachment coupling device same as the above. It is sectional drawing of the operating lever shaft support part of an attachment coupling device same as the above. It is sectional drawing in the slope part of an attachment coupling device same as the above. 1 is a perspective view showing an embodiment of a work machine according to the present invention. It is a perspective view of the working device seen from the operator in a working machine same as the above. It is a perspective view of the conventional working machine. It is a perspective view of the conventional working device seen from the operator in a working machine same as the above.

Explanation of symbols

11 work machines
12 Airframe
21 Lift arm as working arm
22 Attachment coupling device
27 Perspective window
28 Connecting device body
29 Control section
30 Control lever
31 Coupling mechanism
44 Combined actuator
55 Spring
58 Control lever rotation area restriction means A Attachment

Claims (5)

A connecting device main body having a see-through window that can be attached to the tip of the working arm and see through the front;
A coupling mechanism that is provided in the coupling device main body and is pivotally supported facing the see-through window, and is capable of detaching the attachment by rotating an operation lever having an operation unit;
The attachment connecting device, wherein the operating portion of the operating lever of the connecting mechanism rotates in a region above the see-through window. The coupling mechanism is
The attachment coupling device according to claim 1, further comprising: an operation lever rotation region restricting unit configured to rotate the operation portion of the operation lever in a region above the see-through window. The coupling mechanism is
In conjunction with the operation lever, it has a coupling actuating body that can be fitted to and detached from the attachment by sliding up and down on one side and the other side of the coupling device main body with the see-through window interposed therebetween. The attachment coupling device according to claim 1 or 2. The coupling mechanism is
The attachment coupling device according to any one of claims 1 to 3, further comprising a spring that urges the operating lever toward the coupling device main body to suppress rotation. The aircraft,
A lift arm that is pivotally supported by this machine so as to be vertically rotatable;
The attachment coupling device according to any one of claims 1 to 4, wherein the attachment coupling device is pivotally supported at the tip of the lift arm so as to be capable of tilting rotation.
A work machine comprising an attachment coupled to the attachment coupling device.

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