JP6857419B2 - Work machine - Google Patents

Description

The present invention relates to a working machine. In particular, the present invention relates to a work machine capable of switching a part of the work machine between a work state and a stored state.

Currently, in order to reduce the working hours of agricultural work, automatic work machines are being promoted, and various work machines are being developed. In particular, a work machine (cultivator or puddling machine) that is attached to the rear of a tractor or other traveling machine and can be replaced according to the type of work, such as tilling or puddling, is like an attachment to a tractor or other running machine. It is possible to handle various farm work just by exchanging it, which greatly contributes to the cost reduction of farm work.

Working machines such as cultivators and puddling machines have a working rotor that cultivates or agitates the soil by rotating the working claws. In addition, a work machine having a work rotor has a ground leveling mechanism behind the work rotor in order to level the soil roughened by the work claws. In these working machines, in order to efficiently work on the soil, it is preferable that the width in the direction orthogonal to the traveling direction of the traveling machine is large. However, the above-mentioned work machine needs to travel on a farm road or a general road when moving from a storage place for storing the work machine to a place for work (for example, a field). Therefore, the width of the working machine is limited.

Therefore, for example, as in Patent Document 1, by rotating a part of the working portion provided in the working machine, the extended working portion is switched between the folded storage state and the extended working portion in the expanded working state. A working machine that can be developed. As shown in Patent Document 1, in the case of a work machine that switches from a stored state to a work state by expanding the extension work part, the work part and the extension work part are linked in order to work uniformly on the soil. There is a need. In Patent Document 1, in order to link the working portion and the extension working portion, a connecting member for connecting them is provided.

Japanese Unexamined Patent Publication No. 2012-08595

However, when, for example, a hydraulic cylinder is used to apply power to the connecting member to rotate the extension working portion upward, stress is concentrated on the connecting portion between the rod of the hydraulic cylinder and the connecting member. In particular, in the initial state (rotation start state) in which the extension work portion starts to rotate from the working state or the stored state, the force applied to the connection portion becomes very large. Due to this effect, there is a problem that the connecting member in the connecting portion is worn or deformed, and the rotational operation of the extension working portion becomes unstable.

The present invention has been made in view of such a problem, and in a working machine capable of switching between a stored state and a working state, the durability of the connecting portion is high and a stable rotating operation of the extended working portion can be obtained. The purpose is to provide a working machine that can.

The working machine according to the embodiment of the present invention has a first working portion having a first rotor for rotating the first working claw and a second rotor for rotating the second working claw, and has a stored state and a working state. The second working portion rotatably connected to the first working portion, the protruding portion fixed to one of the first working portion and the second working portion, and the protruding portion are arranged inside so as to be switchable. A movement control groove is provided to regulate the movement of the protruding portion, and a connecting portion rotatably connected to the other of the first working portion and the second working portion and a connecting portion that transmits power to the connecting portion to transmit power to the second working portion. In the rotation start state where the second working part starts to rotate, the direction of the tangent line at the contact point between the protruding part and the inner wall of the movement restricting groove is the direction of the protruding part and the second working. The direction is different from the direction of the straight line connecting the rotation center of the portion.

Further, the shape of the movement restricting groove may be curved in the sliding region of the inner wall where the protruding portion slides while pressing the inner wall when the second working portion rotates.

Further, the sliding region is the first sliding region between the rotation start state and the equilibrium state in which the protrusion does not press the inner wall between the rotation start state and the storage state, and the equilibrium state and the storage state. The first sliding region and the second sliding region may be curved in opposite directions with each other.

Further, a rotating portion that is arranged between the protruding portion and the inner wall and rotates around the protruding portion may be further provided.

Further, in the working state, a lock portion that regulates the operation of the second working unit from the working state to the stored state may be further provided.

Further, the lock portion may be released from the restriction on the operation of the second working portion from the working state to the retracted state by the power unit during the period from the working state to the rotation start state.

Further, the lock portion may be rotatably connected to the connecting portion.

Further, the protruding portion may be fixed to the second working portion, the connecting portion may be connected to the first working portion, and the power unit may be arranged in the first working portion.

According to the work machine according to the present invention, there is provided a work machine capable of switching between a stored state and a work state, in which the durability of the connecting portion is high and a stable rotation operation of the extension work portion can be obtained. can do.

It is a perspective view which shows the whole structure of the working state in the working machine which concerns on one Embodiment of this invention. It is a top view which shows the whole structure of the working state in the working machine which concerns on one Embodiment of this invention. It is a side view which shows the whole structure of the working state in the working machine which concerns on one Embodiment of this invention. It is a perspective view which shows the whole structure which one extension work part is in the stored state in the work machine which concerns on one Embodiment of this invention. It is a side view which shows the whole structure which the 2nd working part is in the stored state in the working machine which concerns on one Embodiment of this invention. It is a front view which shows the working state in the connecting part of the working part and the extension working part of the work machine which concerns on one Embodiment of this invention. It is a figure explaining the positional relationship of the protrusion and the movement regulation groove in the state of FIG. It is a front view which shows the rotation start state of the extension work part in the connection part of the work part and the extension work part of the work machine which concerns on one Embodiment of this invention. It is a figure explaining the positional relationship of the protrusion and the movement regulation groove in the state of FIG. It is a front view which shows the state which rotates the extension work part from the work state to the retracted state in the connection part of the work part and the extension work part of the work machine which concerns on one Embodiment of this invention. It is a figure explaining the positional relationship of the protrusion and the movement regulation groove in the state of FIG. It is a front view which shows the state which rotates the extension work part from the work state to the retracted state in the connection part of the work part and the extension work part of the work machine which concerns on one Embodiment of this invention. It is a figure explaining the positional relationship of the protrusion and the movement regulation groove in the state of FIG. It is a front view which shows the equilibrium state of the extension work part in the connection part of the work part and the extension work part of the work machine which concerns on one Embodiment of this invention. It is a figure explaining the positional relationship of the protrusion and the movement regulation groove in the state of FIG. It is a front view which shows the state which rotates the extension work part from the work state to the retracted state in the connection part of the work part and the extension work part of the work machine which concerns on one Embodiment of this invention. It is a figure explaining the positional relationship of the protrusion and the movement regulation groove in the state of FIG. It is a front view which shows the stored state in the connecting part of the work part and the extension work part of the work machine which concerns on one Embodiment of this invention. It is a figure explaining the positional relationship of the protrusion and the movement regulation groove in the state of FIG. It is a figure explaining the positional relationship of the protrusion part and the movement regulation groove in the rotation start state when the extension work part is expanded from the stored state.

Hereinafter, the working machine according to the present invention will be described with reference to the drawings. However, the working machine of the present invention can be implemented in many different modes, and is not construed as being limited to the description of the embodiments shown below. In the drawings referred to in the present embodiment, the same parts or parts having the same functions are designated by the same reference numerals, and the repeated description thereof will be omitted. Further, for convenience of explanation, the terms "upper" and "lower" will be used, but the upper and lower directions indicate the directions of the working machine in the working state. Similarly, although the description will be made using the terms front and rear, the front indicates the direction of the traveling machine that pulls the working machine with respect to the working machine, and the rear indicates the direction of the working machine with respect to the traveling machine.

<Embodiment 1>
The overall configuration of the working machine and each functional part of the working machine according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 19. The working machine according to the first embodiment of the present invention is used as a working machine such as a cultivator or a puddling machine, which is connected to the rear part of a traveling machine such as a tractor and cultivates or stirs soil by rotating a working claw. be able to. Further, the work machine according to the first embodiment has a stored state in which the width of the work machine is narrowed by folding a part of the work machine and a work in which the width of the work machine is widened by expanding a part of the work machine. It can be used for work machines that can switch between states. In the first embodiment, the features of the present invention will be described using a puddling machine as an example of the working machine, but the working machine according to the present invention may be a cultivator, and may be a cultivator and a working machine other than the puddling machine. It can also be applied.

[Structure of working machine 10]
First, the overall configuration of the working machine according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a perspective view showing an overall configuration of a working state in a working machine according to an embodiment of the present invention. Further, FIG. 2 is a top view showing an overall configuration of a working state in the working machine according to the embodiment of the present invention. Further, FIG. 3 is a side view showing an overall configuration of a working state in the working machine according to the embodiment of the present invention. As shown in FIGS. 1 and 2, the working machine 10 according to the first embodiment includes a first working unit (working unit) 100, a second working unit (extended working unit) 200, a switching unit 300, a leveler connecting unit 400, and a leveler connecting unit 400. It has a leveler control unit 500. Further, as will be described in detail with reference to FIG. 3, a rotor 600 is provided below the first working unit 100 and the second working unit 200.

The configuration of each functional unit of the working machine 10 will be described in detail with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, the first working unit 100 has a first shield cover 110, a first apron 120, and a first leveler 130. The first shield cover 110 is provided above the first rotor provided corresponding to the first working portion 100 of the rotor 600 (see FIG. 3) for rotating the working claw 610. The first apron 120 is provided behind the first rotor. The first leveler 130 is provided behind the first rotor.

Here, the first shield cover 110 and the first apron 120 are connected with the connecting portion 122 as a rotation movement shaft (rotation shaft). Further, the first apron 120 and the first leveler 130 are connected with the connecting portion 132 as a rotation shaft. The connecting portion 122 and the connecting portion 132 have a hinge-shaped hinge. That is, the connecting portion 122 and the connecting portion 132 have a cylindrical portion and a columnar portion. Here, the cylindrical portion of the connecting portion is fixed to one of the two members connected by the connecting portion, the columnar portion penetrates the inside of the cylindrical portion, and both ends of the columnar portion are connected by the supporting member. It is fixed to the other of the two members connected by.

The first apron 120 suppresses the scattered matter scattered by the work of the rotor 600 (see FIG. 3) from being released to the outside (particularly upward and rearward). In addition, the first leveler 130 prepares the rough soil by the work of the rotor 600 (see FIG. 3). The leveler control unit 500 controls the angle of the first leveler 130 with respect to the first apron 120. For example, in the working state, the leveler control unit 500 pushes the first leveler 130 downward to realize a state in which the first leveler 130 rotates (rotates) downward with respect to the first apron 120 (earth gathering state). can do.

The second working unit 200 is connected to the first working unit 100 so that the working machine 10 can switch between the stored state and the working state. Here, the stored state is a state in which the width of the working machine in the direction orthogonal to the traveling direction of the traveling machine is reduced. Specifically, the folded state in which the second working unit 200 rotates upward with respect to the first working unit 100 is referred to as a stored state. The working state is a state in which the first working unit 100 and the second working unit 200 are extended in a direction orthogonal to the traveling direction of the traveling machine. Specifically, the state in which the second working unit 200 rotates with respect to the first working unit 100 from the stored state and is deployed is referred to as a working state.

Further, the second working unit 200 has a second shield cover 210, a second apron 220, and a second leveler 230, similarly to the first working unit 100. The second shield cover 210 is provided above the second rotor provided corresponding to the second working portion 200 of the rotor 600 that rotates the working claw 610 (see FIG. 3). The second apron 220 is provided behind the second rotor and is rotatably connected to the second shield cover 210 with the connecting portion 222 as an axis. The second leveler 230 is provided behind the second rotor and is rotatably connected to the second apron 220 about the connecting portion 232. The second apron 220 works in conjunction with the first apron 120 to prevent the scattered material scattered by the work of the rotor 600 from being released to the outside. In addition, the second leveler 230 works in conjunction with the first leveler 130 to level the rough soil by the work of the rotor 600.

As shown in FIG. 2, the switching portion 300 includes a control cylinder 310, a shield cover connecting portion 320, a shield cover connecting portion 330, a protruding portion 340, a lock connecting arm 350, a lock member 360, and a lock receiving member 370. The switching unit 300 rotates the second working unit 200 with respect to the first working unit 100 by interlocking the above members, and switches between the stored state and the working state.

One end of the control cylinder 310 is rotatably connected to the first working portion 100, and the other end is rotatably connected to the shield cover connecting portion 330. The second working unit 200 is folded when the control cylinder 310 contracts and switched to the stored state, and is expanded and switched to the working state when the control cylinder 310 expands. The second working unit 200 rotates around the shield cover connecting unit 320 as a rotation center to perform the above switching. In other words, the control cylinder 310 transmits power to the shield cover connecting portion 330 to rotate the second working portion 200. Here, the control cylinder 310 can also be referred to as a power unit.

Although the details will be described later, the positional relationship between the lock member 360 and the lock receiving member 370 is caused by interlocking the shield cover connecting portion 330, the protruding portion 340, the lock connecting arm 350, and the lock member 360 by the operation of the control cylinder 310. To switch between the locked state and the unlocked state. The locked state is a state in which the operation of the second working unit 200 from the working state to the stored state is restricted in the working state. Further, by interlocking the above members, the power of the control cylinder 310 is transmitted to the second working unit 200, and the second working unit 200 is rotated upward. Here, the shield cover connecting portion 330 is provided with a movement restricting groove 332, and the protruding portion 340 is arranged inside the movement restricting groove 332 to control the interlocking operation of the above members. Further, the shield cover connecting portion 330 is rotatably connected to the first working portion 100, and the protruding portion 340 is fixed to the second working portion 200.

The leveler connecting portion 400 is attached to the first leveler 130 and the second leveler 230, and is the second in the rotation direction of the first leveler 130 with respect to the first apron 120 or the rotation direction of the second leveler 230 with respect to the second apron 220. The relative operating range of the 1 apron 120 and the 2nd apron 220 is regulated. That is, the leveler connecting portion 400 links the first leveler 130 and the second leveler 230.

The leveler control unit 500 is connected to the first shield cover 110 and the first leveler 130, and adjusts the position and angle of the first leveler 130 with respect to the first shield cover 110. The leveler control unit 500 acts on the first leveler 130 so that the first leveler 130 has a predetermined height or angle set with respect to the ground.

Here, at the end of the second leveler 230, a leveler expansion portion 510 that can further widen the width that can be leveled is provided. The leveler extension 510 is rotatably connected to the second leveler 230. Further, the leveler expansion portion 510 extends in a direction inclined forward with respect to the extension direction of the first leveler 130 and the second leveler 230 (longitudinal forward with respect to the extension direction of the first leveler 130 and the second leveler 230). have).

Next, the configuration of each functional unit of the working machine 10 will be described in detail with reference to FIG. As shown in FIG. 3, the rotor 600 has a working claw 610 and a power unit 620. In FIG. 3, a part of the power unit 620 is hidden by the second working unit 200, but in FIGS. 4 and 5 showing the folded state of the second working unit 200, the overall image of the power unit 620 is shown. It is shown. The work claw 610 is rotated by the power unit 620 and acts on the soil to plow or agitate the soil.

Further, a soil gathering plate 520 is provided on the traveling machine side of the first shield cover 110 and the second shield cover 210. The earth gathering plate 520 is attached so as to be slidable in a direction orthogonal to the traveling direction of the traveling machine (left-right direction in FIG. 2). When the work machine 10 is used, the soil gathering plate 520 is installed so as to match the positions of the wheels and the like of the traveling machine to alleviate the step caused by the ruts.

The stored state of the working machine 10 will be described with reference to FIGS. 4 and 5. FIG. 4 is a perspective view showing an overall configuration in which one of the extension working portions is in a stored state in the working machine according to the embodiment of the present invention. Further, FIG. 5 is a side view showing an overall configuration in which the second working portion is in the stored state in the working machine according to the embodiment of the present invention. The perspective view shown in FIG. 4 is a perspective view of the working machine 10 as viewed from the front.

As shown in FIGS. 4 and 5, the control cylinder 310 contracts, so that the second working unit 200 is folded and put into a stored state. While the second working portion 200 rotates from the working state to the retracted state, the shield cover connecting portion 330 is rotated by the control cylinder 310, and the protruding portion 340 is in contact with the inner wall of the movement restricting groove 332 as the second working portion 200 rotates. It moves (the protrusion 340 and the inner wall of the movement restricting groove 332 slide). Here, in order to prevent the protrusion 340 from detaching from the movement restricting groove 332, a stopper 342 is provided near the end of the protrusion 340 (see FIG. 5). Further, as will be described later, a ring-shaped or columnar rotating portion rotatably attached around the protruding portion 340 may be arranged between the protruding portion 340 and the inner wall of the movement restricting groove 332.

As shown in FIG. 5, the plane of the shield cover connecting portion 330 and the plane of the lock member 360 are substantially parallel to each other. The lock connecting arm 350 is bent so as to connect the flat surface of the shield cover connecting portion 330 and the flat surface of the lock member 360. In other words, the lock connecting arm 350 includes a first connecting portion 352 connected to the shield cover connecting portion 330, a second connecting portion 354 connected to the lock member 360, and a first connecting portion 352 and a second connecting portion 354. It has a bent portion 356 for connecting the above. The plane of the bent portion 356 is non-parallel to the plane of each of the shield cover connecting portion 330, the first connecting portion 352, the lock member 360, and the second connecting portion 354.

A first clutch 622 is arranged in the power unit 620, and rotates by receiving the power of the power unit 620. A second clutch 624 is arranged on a claw shaft to which the work claw 610 of the second working portion 200 is attached. The first clutch 622 is provided with an opening inside the disk, and the second clutch 624 is provided with a protrusion at a position corresponding to the opening of the first clutch 622. In the working state, the protruding portion of the second clutch 624 is inserted into the opening of the first clutch 622, and the two are fitted (fitted), so that the power of the power unit 620 is transmitted to the second working unit 200. To.

In the above description, the shield cover connecting portion 330 is rotatably connected to the first working portion 100, and the protruding portion 340 is fixed to the second working portion 200, but the present invention is not limited to this configuration. .. For example, the shield cover connecting portion 330 may be rotatably connected to the second working portion 200, and the protruding portion 340 may be fixed to the first working portion 100.

[Configuration of switching unit 300 and its operation]
6 to 19 will be used to describe in detail the configuration and operation of the switching unit 300 of the working machine 10 according to the first embodiment of the present invention. Here, an operation of switching the position of the second working unit 200 from the working state to the stored state will be illustrated.

FIG. 6 is a front view showing a working state in a connecting portion between a working portion and an extension working portion of a working machine according to an embodiment of the present invention. As shown in FIG. 6, the control cylinder 310 is rotatably connected to the first working unit 100 at the connecting unit 312. Further, the control cylinder 310 has a control rod 314, and the control rod 314 extends toward the shield cover connecting portion 330.

The shield cover connecting portion 330 is rotatably connected to the first working portion 100 at the connecting portion 334. Further, the shield cover connecting portion 330 is rotatably connected to the tip of the control rod 314 at the connecting portion 336. That is, the shield cover connecting portion 330 rotates about the connecting portion 334 according to the expansion and contraction of the control cylinder 310. The second working portion 200 rotates around the shield cover connecting portion 320 in response to the rotation of the shield cover connecting portion 330.

The lock connecting arm 350 is rotatably connected to the shield cover connecting portion 330 at the first connecting portion 352. The lock member 360 has a hook 362. Further, the lock member 360 is rotatably connected to the second working portion 200 at the connecting portion 364, and is rotatably connected to the lock connecting arm 350 at the connecting portion 366. That is, the lock member 360 receives an action from the lock connecting arm 350 and rotates about the connecting portion 364. In the working state, the hook 362 is locked to the lock bar 372 of the lock receiving member 370 to be in the locked state.

FIG. 7 is a diagram for explaining the positional relationship between the protruding portion and the movement restricting groove in the state of FIG. In FIG. 7, for convenience of explanation, the stopper 342 provided near the tip of the protrusion 340 is omitted. As shown in FIG. 7, the protruding portion 340 has a shaft portion 344 and a rotating portion 346. The rotating portion 346 has a ring shape, is arranged so as to surround the circumference of the shaft portion 344, and rotates along the outer circumference of the shaft portion 344. Here, the ring shape refers to a shape that is closed so as to include the shaft portion 344 inside, and may be, for example, a cylindrical shape. In the present embodiment, the shaft portion 344 is cylindrical and the rotating portion 346 is cylindrical. As the rotating portion 346, a member such as a ball bearing can be used in addition to the ring-shaped member described above.

Further, in the shape of the movement regulation groove 332, the sliding region on which the protrusion 340 slides is curved. Here, the sliding region refers to a region in which the protruding portion 340 slides while pressing the inner wall of the movement restricting groove 332 when the second working portion 200 rotates. The sliding region has a first sliding region 380 on the lock member 360 side of the movement restricting groove 332 and a second sliding region 382 on the side facing the first sliding region 380. The first sliding region 380 and the second sliding region 382 are curved in opposite directions.

Referring to FIGS. 6 and 7, the shape of the movement restricting groove 332 provided in the shield cover connecting portion 330 is the first region 332-1 in which the protruding portion 340 can move in the direction away from the rotation center of the lock member 360. The shape is provided with a second region 332-2 in which the protrusion 340 can move in a direction away from the shield cover connecting portion 320, which is the rotation center of the second working portion 200. In the locked state (that is, working state) of the lock member 360, the protruding portion 340 moves to the first region 332-1 and the second working part 200 is rotating (that is, from the working state to the stored state). The protrusion 340 moves to the second region 332-2. As shown in FIG. 7, the protruding portion 340 is located in the first region 332-1 so as not to come into contact with the movement restricting groove 332 in the working state.

FIG. 8 is a front view showing a rotation start state of the extension work portion in the connecting portion of the work portion and the extension work portion of the work machine according to the embodiment of the present invention. When the control cylinder 310 contracts from the working state, the shield cover connecting portion 330 rotates upward (clockwise) around the connecting portion 334. At this time, the lock connecting arm 350 is pulled upward while the protruding portion 340 moves downward with respect to the shield cover connecting portion 330. As the lock connecting arm 350 moves, the lock member 360 rotates around the connecting portion 364 in a direction in which the hook 362 and the lock bar 372 are unlocked. That is, the lock member 360 is in the unlocked state. When the lock member 360 is in the unlocked state, the inner wall of the movement restricting groove 332 of the shield cover connecting portion 330 presses the protruding portion 340 upward, and the second working portion 200 is started to rotate upward. The state shown in FIG. 8 is a state immediately before the second working unit 200 starts to rotate. This state is called the rotation start state.

FIG. 9 is a diagram for explaining the positional relationship between the protruding portion and the movement restricting groove in the state of FIG. In the rotation start state, the protrusion 340 is located between the first region 332-1 and the second region 332-2. At this time, the direction in which the inner wall of the movement restricting groove 332 presses the protruding portion 340 is not perpendicular to the tangential direction at the contact point 384 (which may be a contact line or a contact surface) between the protruding portion 340 and the movement restricting groove 332. The shape of the movement control groove 332 is designed so as to be. In other words, the direction of the tangent line at the contact 384 is different from the direction of the straight line connecting the projecting portion 340 and the shield cover connecting portion 320 which is the rotation center of the second working portion 200. The shape is designed.

By doing so, when the inner wall of the movement restricting groove 332 presses the protruding portion 340, the force due to the pressing is dispersed, so that it is possible to prevent excessive pressure from being applied to the protruding portion 340. As a result, it is possible to suppress the shape change or breakage of the protrusion 340 and the movement restricting groove 332. Here, the straight line connecting the protruding portion 340 and the shield cover connecting portion 320 may be a straight line connecting the center of the protruding portion 340 and the rotation center of the second working portion 200 in the shield cover connecting portion 320, and may be a contact point. It may be a straight line connecting the 384 and the rotation center of the second working portion 200 in the shield cover connecting portion 320.

In the movement restricting groove 332 shown in the present embodiment, a part of the force of the inner wall of the movement restricting groove 332 pressing the protrusion 340 in the rotation start state causes the protrusion 340 to be in the second region 332 with respect to the protrusion 340. It acts in the direction of moving to -2. In other words, the direction of the tangent line at the contact point 384 has a larger inclination angle with respect to the direction of the second region 332-2 than the direction of the straight line connecting the projecting portion 340 and the shield cover connecting portion 320. In other words, the power transmitted by the control cylinder 310 causes an action of rotating the second working portion 200 upward and an action of moving the protruding portion 340 in the direction of the second region 332-2. In this way, the force applied to the inner wall of the protrusion 340 and the movement restricting groove 332 is dispersed in the rotation direction of the second working portion 200 and the movement direction of the protrusion 340 to the second region 332-2, thereby protruding. Excessive pressure can be alleviated on the portion 340 and the movement restricting groove 332, and the protruding portion 340 can be smoothly moved to the second region 332-2.

FIG. 10 is a front view showing a state in which the extension work portion is rotated from the work state to the retracted state in the connecting portion between the work portion and the extension work portion of the work machine according to the embodiment of the present invention. When the control cylinder 310 further contracts from the rotation start state of FIG. 8, the shield cover connecting portion 330 further rotates, and the protruding portion 340 slides while pressing the inner wall of the movement restricting groove 332, and the second region 332 Move towards the end of -2. The second working portion 200 rotates upward as the protruding portion 340 slides on the inner wall of the movement restricting groove 332.

FIG. 11 is a diagram for explaining the positional relationship between the protruding portion and the movement restricting groove in the state of FIG. As shown in FIG. 11, when the second working portion 200 rotates upward, the protruding portion 340 slides on the inner wall of the movement restricting groove 332 in the first sliding region 380. Here, in the first sliding region 380, the shape of the movement restricting groove 332 is curved in a concave shape. Due to this curved shape, the tangential direction of the contact 384 gradually changes as the shield cover connecting portion 330 rotates. In the state shown in FIGS. 10 and 11, the direction of the tangent line at the contact point 384 has a larger inclination angle with respect to the direction of the control cylinder 310 than the direction of the straight line connecting the projecting portion 340 and the shield cover connecting portion 320.

FIG. 12 is a front view showing a state in which the extension work portion is rotated from the work state to the retracted state in the connecting portion between the work portion and the extension work portion of the work machine according to the embodiment of the present invention. When the control cylinder 310 further contracts from the state shown in FIG. 10, the protruding portion 340 further slides while pressing the first sliding region 380 of the movement restricting groove 332 to the vicinity of the end portion of the second region 332-2. Moving.

FIG. 13 is a diagram for explaining the positional relationship between the protruding portion and the movement restricting groove in the state of FIG. As shown in FIG. 13, as the second working portion 200 rotates, the protruding portion 340 moves to the vicinity of the end portion of the second region 332-2. Again, due to the curved shape of the first sliding region 380, the tangential direction of the contact 384 gradually changes as the shield cover connecting portion 330 rotates.

FIG. 14 is a front view showing an equilibrium state of the extension work portion in the connecting portion of the work portion and the extension work portion of the work machine according to the embodiment of the present invention. When the control cylinder 310 further contracts from the state shown in FIG. 12, an equilibrium state is reached in which the clockwise rotation moment and the counterclockwise rotation moment of the second working unit 200 coincide with each other. In the equilibrium state, the protrusion 340 does not press the inner wall of the movement restricting groove 332.

FIG. 15 is a diagram for explaining the positional relationship between the protruding portion and the movement restricting groove in the state of FIG. FIG. 15 shows a state in which the protruding portion 340 is closer to the second sliding region 382 side in the equilibrium state. As shown in FIG. 15, the movement restricting groove 332 is designed so that a gap is formed between the protrusion 340 and the end of the second region 332-2 of the movement restricting groove 332 in the equilibrium state. Further, in the equilibrium state, the distance between the first sliding region 380 and the second sliding region 382 of the movement restricting groove 332 is wider than the diameter of the protrusion 340. That is, in the equilibrium state, the protrusion 340 may be in a non-contact state with the inner wall of the movement restricting groove 332.

FIG. 16 is a front view showing a state in which the extension work portion is rotated from the work state to the retracted state in the connection portion between the work portion and the extension work portion of the work machine according to the embodiment of the present invention. When the second working unit 200 rotates beyond the equilibrium state, the second working unit 200 tries to rotate due to the weight of the second working unit 200. At this time, the protrusion 340 and the inner wall of the movement restricting groove 332 in the second sliding region 382 come into contact with each other, and the control cylinder 310 supports the rotation of the shield cover connecting portion 330, so that the second working portion 200 rotates. Is regulated.

FIG. 17 is a diagram for explaining the positional relationship between the protruding portion and the movement restricting groove in the state of FIG. As shown in FIG. 17, when the second working portion 200 rotates beyond the equilibrium state toward the retracted state, the protruding portion 340 slides on the inner wall of the movement restricting groove 332 in the second sliding region 382. Here, in the second sliding region 382, the shape of the movement restricting groove 332 is curved in a concave shape. Due to this curved shape, the tangential direction of the contact 384 gradually changes as the shield cover connecting portion 330 rotates.

FIG. 18 is a front view showing a stored state of a connecting portion between a working portion and an extension working portion of a working machine according to an embodiment of the present invention. Further, FIG. 19 is a diagram for explaining the positional relationship between the protruding portion and the movement restricting groove in the state of FIG. In the stored state, the second working portion 200 is supported by another support member, so that the protruding portion 340 and the inner wall of the movement restricting groove 332 are not in contact with each other.

As described above, from the rotation start state to immediately before the equilibrium state, the control cylinder 310 gives the shield cover connecting portion 330 a power to rotate so as to lift the second working portion 200, and is in the equilibrium state. From immediately after to the stored state, the control cylinder 310 supports the downward rotation of the second working unit 200 due to its own weight, and gives a power to regulate the rotation of the second working unit 200. Further, the protrusion 340 slides on the first sliding region 380 of the movement restricting groove 332 from the rotation start state to immediately before the equilibrium state, and the protrusion 340 is from immediately after the equilibrium state to the retracted state. The 340 slides in the second sliding region 382 of the movement restricting groove 332.

FIG. 20 is a diagram for explaining the positional relationship between the protruding portion and the movement restricting groove in the rotation start state when the extension work portion is deployed from the stored state. When the control cylinder 310 extends from the stored state shown in FIG. 19, the inner wall of the movement restricting groove 332 presses the protruding portion 340 as shown in FIG. 20, and the second working portion 200 starts to rotate upward. The direction in which the inner wall of the movement restricting groove 332 presses the protrusion 340 in the rotation start state in the rotation from the stored state to the working state is a direction that is not perpendicular to the tangential direction at the contact 384. In other words, the shape of the movement restricting groove 332 is designed so that the direction of the tangent line at the contact point 384 is different from the direction of the straight line connecting the projecting portion 340 and the shield cover connecting portion 320. That is, even in the rotation start state in the rotation from the stored state to the working state, a part of the force by which the inner wall of the movement restricting groove 332 presses the protruding portion 340 causes the protruding portion 340 to move with respect to the protruding portion 340. It acts in the direction of moving to 2 regions 332-2.

As described above, according to the working machine according to the first embodiment, in the rotation start state of the second working portion 200, the direction in which the inner wall of the movement restricting groove 332 presses the protruding portion 340 is relative to the tangential direction at the contact point between the two. By making the direction not vertical, it is possible to prevent excessive pressure from being applied to the protrusion 340. As a result, it is possible to suppress the shape change or breakage of the protruding portion 340 and the movement restricting groove 332, the durability of the connecting portion is high, and a stable rotational operation of the extension working portion can be obtained.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit.

10: Work machine, 100: 1st work part, 110: 1st shield cover, 120: 1st apron, 122, 132, 222, 232, 312, 334, 336, 364, 366: Connection part, 130: 1st Leveler, 200: 2nd working part, 210: 2nd shield cover, 220: 2nd apron, 230: 2nd leveler, 300: Switching part, 310: Control cylinder, 314: Control rod, 320: Shield cover connection part, 330: Shield cover connecting part, 332: Movement control groove, 332-1: 1st area, 332-2: 2nd area, 340: Protruding part, 342: Stopper, 344: Shaft part, 346: Rotating part, 350: Lock connecting arm, 352: 1st connecting part, 354: 2nd connecting part, 356: Bending part, 360: Lock member, 362: Hook, 370: Lock receiving member, 372: Lock bar, 380: 1st sliding area , 382: 2nd sliding area, 384: contact, 400: leveler connection part, 500: leveler control part, 510: leveler expansion part, 520: earth gathering plate, 600: rotor, 610: work claw, 620: power part, 622: 1st clutch, 624: 2nd clutch

Claims (3)

The first working part having the first rotor for rotating the first working claw, and
A second working unit that has a second rotor that rotates the second working claw and is rotatably connected to the first working unit so as to be able to switch between a stored state and a working state.
A first protruding portion fixed to one of the first working portion and the second working portion,
By arranging the first protruding portion inside, a movement restricting groove for restricting the movement of the first protruding portion is provided, and the first working portion and the second working portion are rotatably connected to each other. With the connecting part
It has a power unit that transmits power to the connecting unit and rotates the second working unit.
A part of the inner wall of the movement regulation groove is curved in a concave shape.
The contact point between the movement restricting groove and the first protruding portion in the rotation start state in which the second working portion starts to rotate from the working state or the stored state is set as the first contact.
An equilibrium state in which the second working portion rotates from the rotation start state, and the first protruding portion does not press the inner wall of the movement restricting groove between the rotation start state and the stored state or the working state. Assuming that the contact point between the movement restricting groove and the first protruding portion in the first state immediately before becomes the second contact point,
The inner wall between the first contact and the second contact is included in the concave inner wall.
The region from the first contact point to the second contact point, in which the first protruding portion slides on the inner wall, is defined as the first sliding region.
A first contact point between the movement restricting groove and the first protruding portion in the second state immediately after the equilibrium state when the second working portion rotates in the direction from the first state to the equilibrium state. The region from the three contacts to the fourth contact, which is the contact between the movement restricting groove and the first protruding portion in the third state immediately before the stored state or the working state, and the first protruding portion is the said. Assuming that the region sliding on the inner wall is the second sliding region,
A working machine in which the inner wall in the second sliding region is curved in a concave shape on the side opposite to the inner wall in the first sliding region. The first working part having the first rotor for rotating the first working claw, and
A second working unit that has a second rotor that rotates the second working claw and is rotatably connected to the first working unit so as to be able to switch between a stored state and a working state.
A first protruding portion fixed to one of the first working portion and the second working portion,
By arranging the first protruding portion inside, a movement restricting groove for restricting the movement of the first protruding portion is provided, and the first working portion and the second working portion are rotatably connected to each other. With the connecting part
It has a power unit that transmits power to the connecting unit and rotates the second working unit.
A part of the inner wall of the movement regulation groove is curved in a concave shape.
The contact point between the movement restricting groove and the first protruding portion in the rotation start state in which the second working portion starts to rotate from the working state or the stored state is set as the first contact.
An equilibrium state in which the second working portion rotates from the rotation start state, and the first protruding portion does not press the inner wall of the movement restricting groove between the rotation start state and the stored state or the working state. Assuming that the contact point between the movement restricting groove and the first protruding portion in the first state immediately before becomes the second contact point,
The inner wall between the first contact and the second contact is included in the concave inner wall.
A part of the inner wall of the region from the first contact point to the second contact point, in which the first protruding portion slides on the inner wall , is a rotation of the first protruding portion and the connecting portion. and the the binding BuTadashi line center, the tangent at the contact point between the said inner wall first projecting portion, but the angle is, that curved from the rotation start state so as to reduce towards the equilibrium created Business machine. If the tangent positive angle the angle is in the first contact with the front Kijika lines in the rotation start state, formed by the tangent angle at the second contact point before and Kijika line in the first state The working machine according to claim 2 , which has a negative angle.

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