JP4233637B2 - Working unit attachment / detachment device for work equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention improves workability and safety of attaching / detaching work in a working unit attaching / detaching device for a working machine.
[0002]
[Prior art]
FIG. 6 is a side view of the main body vehicle 20 and the working unit 40 of the working machine with the working unit attached to the front part.
[0003]
The main vehicle 20 includes a connection bracket 21 for attaching the working unit 40 on both the left and right sides, and a hydraulic device and a battery (not shown) that operate the hydraulic cylinder of the working unit 40.
[0004]
As shown in FIGS. 8A and 8B, the connection bracket 21 is a member made of a steel plate, and has a connection hole 21a in the upper part and an engagement hook 21b in the lower part. A protruding guide piece 21c is formed around the connection hole 21a. The engagement hook 21b supports the fulcrum pin 43c of the connection frame 43 as will be described later.
[0005]
On the other hand, the working unit 40 includes a lift arm 41 installed on both left and right sides of the main vehicle 20, a work attachment 42 that is swingably attached to the tip of the lift arm 41, and a connection that is attached to the base end of the lift arm 41. Frame 43. The lift arm 41 is provided on the base end side and operates the lift cylinder 44, the tip end side is provided with the dump cylinder 45 that operates the swing of the work attachment 42, and the center is provided to support the lift arm 41. And a stand mechanism 46.
[0006]
The connecting frame 43 is composed of two steel plate members that oppose each other, a connected hole 43a is formed in the upper part of the two steel plate members, and a fulcrum pin 43b is installed in the lower part between the two steel plate members. A guide 43c is formed on the opposing surfaces of the two steel plate members. The guide 43c is a plate material provided with a reduced diameter from the engagement side end of the connection frame 43 toward the connected hole 43a. As described later, the guide 43c guides the connection bracket 21 at the stage of the mounting operation. The piece 21 c comes into contact with the connecting hole 21 a of the connecting bracket 21 and the connected hole 43 a of the connecting frame 43.
[0007]
The work of attaching the working unit of the working machine is performed according to the following procedure.
[0008]
(1) As shown in FIG. 7, the working unit 40 is placed in a state where the bottom surface of the work attachment 42 is grounded and the stand is upright.
[0009]
(2) The main body vehicle 20 is moved so that the connection brackets 21 on both the left and right sides of the main body vehicle 20 are disposed below the connection frame 43 provided at the base end portion of the lift arm 41 of the working unit 40.
[0010]
(3) The hydraulic connector of each cylinder (not shown) of the working unit 40 and the electrical connector of the control device are connected to the hydraulic device and the battery of the main vehicle 20.
[0011]
(4) The dump cylinder 45 of the working unit 40 is actuated to gradually raise the work attachment, and the connection mechanism 43 of the lift arm 41 is lowered by lowering the connection frame 43 side of the lift arm 41 with the stand mechanism 46 as a fulcrum. The connection bracket 21 of the main body vehicle 20 is connected by the engagement of the fulcrum pin 43b and the engagement hook 21b, and the pin connection between the connection hole 43a and the connection hole 21a, and the working unit 40 is connected to the main body vehicle 20. Fix forward. Note that after the fulcrum pin 43b and the engagement hook 21b are engaged by the lowering of the connection frame 43, the position of the connection hole 43a and the connection hole 21a may be adjusted by contracting the lift cylinder 44.
[0012]
[Problems to be solved by the invention]
As described above, the work part is attached mainly by operating the main body vehicle and the work part, regardless of human power.
[0013]
However, if the place where the attachment is grounded is not leveled and there is a large slope on the left or right of the attachment or is muddy at the stage of mounting work (1), Since it is in an inconsistent state in the lateral swing direction, even if the fulcrum pin of the connection frame of the working unit engages with the engagement hook of the connection bracket of the vehicle on one side of the main vehicle, the fulcrum pin engages on the other side. The hook may not engage. For this reason, the worker must lay wood on the ground surface of the attachment so that the ground surface of the attachment is horizontal so that the coupling frame and the coupling bracket are engaged on both sides of the main vehicle.
[0014]
Further, as described above, when the fulcrum pin of the connecting frame of the working unit is engaged with the engaging hook of the connecting bracket of the main body vehicle on one side of the vehicle and the fulcrum pin is not engaged with the engaging hook on the other side, In the stage (1) and (2) of the mounting operation, if the working part and the vehicle cannot be set at predetermined positions, the fulcrum pin of the connection frame is connected to the connection bracket in the stage (4) of the mounting operation. The connecting frame falls off the connecting bracket. If the work is further performed without the operator noticing in a state where the connection frame has fallen from the connection bracket, an accident may be assumed in which the work part tilts and becomes unstable and the work part falls down.
[0015]
In view of this, the present invention provides a main body so that in the mounting work of the working unit, when the mounting work is simplified and the working unit side connecting member is dropped as described above, the operator can notice and interrupt the work. This is an improvement of the vehicle and working unit attachment / detachment device.
[0016]
[Means for Solving the Problems]
In the working unit attaching / detaching device for a working machine according to the present invention, a base end portion of a pair of left and right lift arms swingable in the vertical direction is detachably connected to both left and right sides of the main body vehicle of the working machine, An attachment that can be swung up and down by a dump cylinder is attached to the tip of the lift, and the working unit including the lift arm and the attachment is attached to the attachment and the left and right attached to the lift arm when detached from the main body vehicle. A pair of stands are grounded together, and the base end of the lift arm is allowed to stand upright. When the working unit is connected to the main body vehicle, the base of the lift arm is connected by a dump operation of the dump cylinder. In the working machine in which the end portion is lowered with respect to both the left and right sides of the main body vehicle, the connection brackets are respectively provided on the left and right sides of the vehicle. In addition, a hook groove opened upward and a short cylindrical guide piece having a connecting hole are formed in the connecting bracket, and a connecting frame whose upper end is pivotally connected to the base end side of the lift arm is connected. And a triangular guide region comprising a fulcrum pin fitted to the hooking groove of the connecting bracket from above, an upper inclined surface portion that descends forward, and a lower inclined surface portion that rises forward. The guide plate having the fulcrum pin is provided, and one fulcrum pin reaches the bottom of the hook groove and the other fulcrum pin does not reach the bottom of the hook groove. Guy in rotation, and a connecting frame which reaches the bottom of the hook groove, and the guide plate, a guide piece which is located above the guide region Axis of the connecting hole of the connecting frame to rise along the mechanism, the guide coincides with the axis of the connecting hole of the connecting bracket in the corner portion between the upper inclined surface portion and the lower inclined surface portion in the region of the hook groove The connecting frame that has not reached the bottom part descends along the guide mechanism of the guide plate and the guide piece located in the lower part of the guide region, and the shaft center of the connection hole of the connection frame is in the guide region. In the corner portion between the upper inclined surface portion and the lower inclined surface portion in FIG.
[0017]
When the fulcrum pin of the connection frame is disengaged forward from the hook groove of the connection bracket, the connection frame has a drop-off preventing piece for receiving the fulcrum pin and preventing the base end of the lift arm from falling off. Is preferred.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of a working machine to which a working unit attaching / detaching device for a working machine according to the invention is applied will be described with reference to the drawings. In the following description, the front side refers to the front side of the main vehicle, and the rear side refers to the rear side of the main vehicle.
[0019]
As shown in FIG. 2, the working machine includes a main body vehicle 60 and a working portion 80 in which a work attachment 86 is attached to the tip of a lift arm 82 that is installed from the left and right sides of the front portion of the main body vehicle 60. .
[0020]
The main body vehicle 60 is equipped with a driver's seat, a hydraulic pressure generating unit (not shown), a battery unit, and operation means for them on the vehicle body, and has connection brackets 62 attached to the left and right sides of the main body vehicle body 60.
[0021]
As shown in FIGS. 4 (a) and 4 (b), the connection bracket 62 is a member made of a steel plate and includes a connection hole 62a formed in the upper part, an engagement hook 62b formed in the lower part, and an engagement hook 62b. And a drop-off prevention piece 63 formed to extend to the front portion of the.
[0022]
A cylindrical guide piece 62c protruding from both sides is formed around the connection hole 62a. That is, the through hole of the cylindrical guide piece 62c constitutes the connection hole 62a through which the connection pin is inserted.
[0023]
The engagement hook 62b projects to the front side of the vehicle and opens upward, and the U-shaped hook groove 64 has an engagement region extending a predetermined width in the vertical direction. As will be described later, the width of this engagement area is determined when the attachment portion is grounded when the attachment is grounded and the attachment is not leveled and there is a large inclination on the left and right of the attachment. For example, even when the working unit 80 and the main vehicle 60 are not aligned in the left-right swing direction, the fulcrum pin 84b of the connection frame 84 can engage with the engagement hook 62b of the connection bracket 62 on the left and right sides of the vehicle. It has a sufficient width.
[0024]
The drop-off prevention piece 63 extends to a region on the front side of the engagement hook 62b, and includes a receiving portion 63a that is inclined downward from the front end of the engagement hook 62b, and a stopper wall 63b that rises vertically at the front end of the receiving portion 63a. Have
[0025]
The working unit 80 includes a lift arm 82, a connecting frame 84 attached to the base end of the lift arm 82, and a work attachment 86 attached to the tip of the lift arm 82.
[0026]
The lift arm 82 is laid in parallel from both the left and right sides of the vehicle, and has two front arms 82a bent in a square shape at the center, and a connecting arm laid between the front arms 82a (not shown). Have The left and right front arms 82a swing in the vertical direction while maintaining a parallel state by connecting the connecting arms therebetween. The lift arm 82 includes a connecting frame pivot hole, an attachment pivot hole, a dump cylinder 93, a lift cylinder 94, and a stand mechanism 95.
[0027]
A connecting frame pivot hole (not shown) is formed at the base ends of the left and right front arms 82a. An attachment pivot hole (not shown) is formed at the tip of the left and right front arms 82a. The dump cylinder 93 is a hydraulic cylinder mechanism for swinging the work attachment 86, and is provided in a region on the front end side of the left and right front arms 82a bent in a dogleg shape. The lift cylinder 94 is a hydraulic cylinder mechanism for swinging the lift arm 82 up and down, and is provided in a region on the base end side of the left and right front arms 82a that is bent in a dogleg shape. The hydraulic piping of both cylinders (93, 94) is guided to the proximal end side of the lift arm 82. The stand mechanism 95 has a foldable structure and is attached to the lower surface of the lift arm 82. The stand mechanism 95 can be folded along the lower surface of the lift arm 82 so as not to hinder the work operation of the working unit 80, and The lift arm 82 can be supported by manually deploying.
[0028]
As shown in FIG. 5, the connecting frame 84 is a member in which two steel plate plates face each other in parallel, and is provided so as to be symmetric with respect to the base ends of the left and right front arms 82a.
[0029]
On the front side of the connection frame 84, an upper pin hole 84 d is pivotally attached to a connection frame pivot attachment hole at the front arm base end, and a lower pin hole 84 e is attached to the lift cylinder 94. As a result, the connecting frame 84 is supported so as to be swingable about a pivoting portion (84d) with the upper front arm 82a as a fulcrum, and its swing angle is operated by operating the lift cylinder 94.
[0030]
On the rear side of the connecting frame 84, a connected hole 84a is formed in the upper part, and a fulcrum pin 84b is provided in the lower part. The connection hole 84a of the connection frame 84 corresponds to the connection hole 62a of the connection bracket 62 attached to the main body vehicle. When the working unit 80 and the main body vehicle 60 are connected, the connection hole 84a and the connection hole 62a are formed. Match and pin through the connecting pin. The fulcrum pin 84b is installed between two opposing plates of the connection frame 84, and corresponds to the engagement hook 62b of the connection bracket 62 of the main vehicle, and is a U-shaped engagement hook 62b formed vertically. The hook groove 64 is locked.
[0031]
Inside the two opposing plates of the connecting frame 84, a guide plate 84c is provided around the connected hole 84a. The guide plate 84c corresponds to the guide piece projecting around the connection hole 62a of the connection bracket 62, opens to the rear portion of the connection frame 84, and reduces to a V-shape toward the connection hole 84a of the connection frame 84. The guide region is formed. That is, as can be seen from FIG. 1 and the like, the guide plate 84c is provided at an intermediate portion in the vertical direction of the connecting frame, and has an upper inclined surface portion that descends forward and a lower inclined surface portion that rises forward. That is, a triangular guide region is formed on the guide plate 84c as described later. The guide plate 84c of the connection frame 84 and the guide piece 62c of the connection bracket 62 are configured such that the end of the guide plate 84c abuts on the guide piece 62c when the working unit 60 and the main body vehicle 80 are mounted. It becomes a guide mechanism that guides the connecting frame 84 so that the position of the connected hole 84a and the position of the connecting hole 62a of the connecting bracket 62 match. The opening width of the guide plate 84c is such that the connecting brackets on the left and right sides of the main body vehicle 80 can be used even when the work portion 80 and the main body vehicle 60 are not aligned in the left-right swinging direction during the mounting operation of the working portion 80 described later. 62 guide pieces 62 c have a sufficient width to enter the guide region of the connecting frame 84.
[0032]
The work attachment 86 has a scooping portion opened to the front side, and is a bucket used for collecting and transporting earth and sand, snow, etc., and the upper part is attached to the dump cylinder 93 on the left and right sides of the rear side, and the lower part is a front arm. It is attached to the tip of the machine so as to be rotatable. When the dump cylinder 93 is operated, the work attachment swings up and down with the pivoting portion at the front end of the front arm 82a as a fulcrum.
[0033]
Hereinafter, the mounting operation of the working unit will be described.
[0034]
The work part is mounted according to the following procedure.
[0035]
(1) As shown in FIG. 3, the working unit 80 is placed in a state where the bottom surface of the work attachment 86 is grounded and the stand 95 is upright.
[0036]
(2) The main body vehicle 60 is moved so that the connection brackets 62 on both the left and right sides of the main body vehicle 60 are disposed below the connection frame 84 provided on the left and right front arms 82a of the working unit 80.
[0037]
(3) The hydraulic connector of each cylinder of the working unit 80 and the electrical connector of the control device are connected to the hydraulic device and the battery of the main body vehicle.
[0038]
(4) Actuate the dump cylinder 93 of the working unit 80 to gradually raise the work attachment 86, lower the base end side of the front arm 82a with the stand mechanism 95 as a fulcrum, and connect the connecting frame 84 of the front arm 82a; The working bracket is fixed to the front of the vehicle by connecting the connecting bracket 62 of the main body vehicle 60.
[0039]
In the operation (4), when the base end side of the front arm 82a is lowered, the fulcrum pins 84b of the connection frame 84 of the front arm 82a are provided on the front side of the connection bracket 62 of the main body vehicle 80 on both the left and right sides of the main body vehicle 60. The engagement hook 62b is engaged. Further, when the base end side of the front arm 82a is lowered, the fulcrum pin 84b is pivotally supported on the bottom portion of the hook groove 64, and the descent on the base end side of the front arm 82a is stopped, and the connection frame 84 is rearward with the fulcrum pin 84b as a fulcrum. Starts turning. By the rotation of the connection frame 84, the guide piece 62c formed around the connection hole 62a of the connection bracket 62 enters the guide region formed by the guide plate 84c of the connection frame 84. Thereafter, the connecting frame 84 is rotated along the guide mechanism of the guide plate 84c and the guide piece 62c, and the connected hole 84a of the connecting frame 84 and the connecting hole 62a of the connecting bracket 62 are guided to a specified position. The connection frame 84 and the connection bracket 62 are connected by passing a connection pin through the connection hole 84a and the connection hole 62a.
[0040]
The main body vehicle 60 can perform the mounting operation of the working unit 80 even when the working unit 80 and the main body vehicle 60 are in an inconsistent state in the left-right swing direction.
[0041]
Hereinafter, the mounting operation in such a case will be described. Here, it is assumed that the left side of the attachment ground is higher than the right side.
[0042]
FIG. 1 shows the positional relationship between the connection frame 84 and the bracket 62 of the main vehicle 60 when the connection frame 84 of the front arm 82a is lowered in the state (4). As shown in the drawing, in this case, the right connecting frame 84 is lowered at a position lower than the left connecting frame 84, and therefore, as shown in FIG. 1C, the fulcrum pin 84b of the right connecting frame 84 is connected to the connecting bracket 62. Even when the bottom of the hook groove 64 of the engaging hook 62b is reached, the fulcrum pin 84b of the left connecting frame 84 remains at the bottom of the hook groove 64 of the engaging hook 62b of the connecting bracket 62 as shown in FIG. Not reach. Then, when the fulcrum pin 84a of the right connection frame 84 reaches the bottom of the hook groove 64 of the engagement hook 62b of the connection bracket 62, the lowering of the connection frame 84 is stopped, and the right and left connection frames 84 connect the fulcrum pin 84b. Starts turning as a fulcrum.
[0043]
That is, as shown in FIG. 1C, one fulcrum pin 84b reaches the bottom of the hook groove 64, and the other fulcrum pin 84b reaches the bottom of the hook groove 64 as shown in FIG. When the connecting frame 84 is not reached, the connecting frame 84 that has reached the bottom of the hook groove 64 by swinging the connecting frame 84 about the fulcrum pin 84b toward the rear is connected to the guide plate 84c and the guide region. The guide bracket 62c is located at the upper portion of the connecting bracket 84 so that the shaft center of the connecting hole 84a of the connecting frame 84 is at the corner of the upper inclined surface portion and the lower inclined surface portion. It coincides with the axial center of the connecting hole 62a (see FIG. 1B). Further, the connecting frame 84 that has not reached the bottom of the hook groove 64 descends along the guide mechanism of the guide plate 84c and the guide piece 62 located in the lower part of the guide region, and the connecting frame 84 is covered. The axial center of the connecting hole 84a coincides with the axial center of the connecting hole 62a of the connecting bracket 84 at the corner portion between the upper inclined surface portion and the lower inclined surface portion (see FIG. 1B).
[0044]
As can be seen from FIG. 1, the state shown in FIG. 1 (c) is displaced to the state shown in FIG. 1 (b), or the state shown in FIG. 1 (a) is changed to the state shown in FIG. 1 (b). Or is displaced. In the state shown in FIG. 1B, the axis of the connection hole 84 a of the connection frame 84 and the axis of the connection hole 62 a of the connection bracket 84 coincide with each other, and the fulcrum pin 84 b extends from the bottom of the hook groove 64. Is slightly raised.
[0045]
At this time, as described above, the engagement region of the engagement hook 62b of the connection bracket 62 is in a state in which the working unit 80 and the main body vehicle 60 are inconsistent in the left-right swinging direction in the mounting operation of the working unit 60. However, since a predetermined region is set in the vertical direction so that the fulcrum pin 84b of the connection frame 84 can be engaged with the engagement hook 62b of the connection bracket 62 on the left and right of the vehicle, the fulcrum of the left connection frame 84 The pin 84b is fixed in the hook groove 64 of the engagement hook 62b of the connection bracket 62. As a result, the left connecting frame 84 rotates without dropping from the connecting bracket 62.
[0046]
Thereafter, as shown in FIG. 1 (b), the left and right connecting frames 84 are rotated to a specified position by the action of the guide mechanism (84c, 62c) described above, and the connected hole 84a and the connecting hole 62a are pinned by the connecting pins. Stopped.
[0047]
After the fulcrum pin 84b and the engagement hook 62b are engaged by the lowering of the connection frame 43, the lift cylinder 94 is contracted, so that the left and right connection frames 84 are moved by the action of the guide mechanism (84c, 62c). It may be rotated to a specified position to align the positions of the connected hole 84a and the connecting hole 62a.
[0048]
As described above, in the work machine according to the present invention, even when the working unit 80 and the main body vehicle 60 are in a state of being mismatched in the left-right swinging direction, the mounting work of the working unit 60 is not failed in the state as it is. Since it can be performed, the mounting work of the working unit 60 can be simplified, and the range of selection of the space where the working machine is placed is widened.
[0049]
Next, the drop-off preventing piece 63 for preventing the connection frame from dropping according to the present invention will be described.
[0050]
As shown in FIG. 4, the drop-off prevention piece 63 rises vertically at the front part of the connection bracket 62 as described above, and the receiving part 63a inclined downward from the front end of the engaging hook 62b, and further at the front end of the receiving part 63a. And a stopper wall 63b. When the position of the main body vehicle 60 is arranged behind the predetermined position with respect to the working unit 80 at the stage of the mounting work (2), the fulcrum of the connecting frame 84 is at the stage of the mounting work (4). Since the pin 84b is lowered to the receiving portion 63a of the drop-off preventing piece 63, the connecting frame 84 is not dropped even when the mounting operation is continued without the operator's knowledge. That is, the drop-off preventing piece 63 receives the fulcrum pin 84b when the fulcrum pin 84b of the connection frame 84 is disengaged forward from the hook groove 64 of the connection bracket 62, and prevents the base end portion of the lift arm 82 from falling off. Further, since the connecting frame 84 lowered to the receiving portion 63a is thereafter locked by the stopper wall 63b, the lowering of the connecting frame 84 is stopped, and an accident caused by dropping of the connecting frame 84 can be prevented. .
[0051]
As mentioned above, although one Embodiment of the working part attachment / detachment apparatus of the working machine which concerns on this invention was described, this invention is not limited to this.
[0052]
For example, in the above-described embodiment, the case where the working unit is attached to the front portion of the vehicle has been described, but the working portion that is attached to the rear portion of the vehicle can be equally configured.
[0053]
Moreover, in the said embodiment, although the engagement means to engage previously among the engagement means used for connection with a connection frame and a connection bracket is comprised by the engagement means by a fulcrum pin and an engagement hook, The engaging means used here only needs to have an engaging area with a predetermined width in the vertical direction as described above, and other engaging means can be used. Further, a fulcrum pin may be formed on the vehicle-side connection bracket, and an engagement hook may be formed on the working unit-side connection frame. In this case, the drop-off prevention piece may be provided so as to extend to the engagement hook of the connection frame.
[0054]
【The invention's effect】
The working unit attaching / detaching device for a working machine according to the present invention engages in a vertical direction that can be engaged even when the working unit and the main body vehicle are in an inconsistent state in the left-right swinging direction during the work of mounting the working machine. Since the region is provided, the mounting operation can be performed even in such a state when the working unit is mounted on the vehicle.
[0055]
Further, in the case where the fall prevention piece is provided, the base end portion of the lift arm is lowered into the fall prevention piece even when the working unit and the main body vehicle are not arranged at the predetermined positions in the work of mounting the work machine. Therefore, the work machine side connecting member does not fall off from the vehicle side connecting member, and an accident caused by the work machine side connecting member coming off in the mounting work can be prevented.
[Brief description of the drawings]
FIGS. 1A to 1C are side views showing a working unit mounting device for a working machine according to an embodiment of the present invention.
FIG. 2 is a side view of a working machine according to an embodiment of the present invention.
FIG. 3 is a side view of a working machine according to an embodiment of the present invention.
4A is a front view of a connection bracket, and FIG. 4B is a side view of the connection bracket.
5A is a side view of a connection frame, and FIG. 5B is a rear view of the connection frame.
FIG. 6 is a side view of the work machine.
FIG. 7 is a side view of the work machine.
8A and 8B are side views of the working unit mounting device.
[Explanation of symbols]
60 Main body vehicle 62 Connection bracket 62a Connection part 62b Engagement hook 62c Guide piece 63 Fall-off prevention piece 80 Work part 82 Lift arm 84 Connection frame 84a Connection part 84b Support point pin 84c Guide plate 86 Work attachment 93 Dump cylinder 94 Lift cylinder 95 Stand mechanism

Claims (2)

The base ends of a pair of left and right lift arms that can swing in the vertical direction are detachably connected to the left and right sides of the main body vehicle of the work implement, and the tip ends of the lift arms are swinged in the vertical direction by a dump cylinder. A possible attachment is attached, and the working unit including the lift arm and the attachment grounds the attachment and a pair of left and right stands attached to the lift arm when detached from the main body vehicle. When the working unit is connected to the main body vehicle, the base end portion of the lift arm is moved relative to the left and right sides of the main body vehicle by the dumping operation of the dump cylinder. In work machines that are designed to descend,
A connecting bracket is provided on each of the left and right sides of the vehicle, and a hook groove opened upward and a short cylindrical guide piece having a connecting hole are formed in the connecting bracket,
A connecting frame whose upper end is pivotally connected to the base end side of the lift arm, and a fulcrum pin fitted from above to the hook groove of the connecting bracket and an upper inclined surface portion that descends forward are connected to the connecting frame. And a guide plate having a triangular guide region composed of a lower inclined surface portion rising toward the front,
When one of the fulcrum pins reaches the bottom of the hook groove and the other fulcrum pin does not reach the bottom of the hook groove, the hook frame is rotated by turning the connecting frame around the fulcrum pin. The connecting frame that reaches the bottom of the guide frame rises along a guide mechanism composed of the guide plate and a guide piece located in the upper part of the guide region, and the axis of the connection hole of the connection frame is The connecting frame that coincides with the axis of the connecting hole of the connecting bracket at the corner portion of the upper inclined surface portion and the lower inclined surface portion in the guide region and does not reach the bottom of the hook groove includes the guide plate and the guide region. corners smell the axis of the connecting hole of the connecting frame descends along the guide mechanism of the guide piece located below it, the upper inclined surface portion and the lower inclined surface in the guide region The working unit attachment apparatus of the working machine, characterized in that coincides with the axis of the connecting hole of the connecting bracket.   The connection frame has a drop-off preventing piece for receiving the fulcrum pin and preventing the base end portion of the lift arm from falling off when the fulcrum pin of the connection frame is disengaged forward from the hook groove of the connection bracket. The working unit attaching / detaching device for a working machine according to claim 1.

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