JP2013066479A - Working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent interference of a ground-leveling device.SOLUTION: A working machine is provided by installing a vertical link at the rear side of a traveling vehicle body (1) via a lifting link device (3) so as to be capable of ascending and descending, supporting the ground-leveling device (8) by the vertical link via a vertical motion mechanism so as to be capable of moving upward to a storage position, mounting a working part (4) via a detachable hitch attached and detached to the vertical link, installing a locking device for locking so that the detachable hitch is not detached while attaching the working part, installing a rolling shaft for right and left rolling both of the working part (4) and ground-leveling device (8), and constituting that when the working part (4) is lifted, the ground-leveling device (8) is moved upward to the storage position by the action of the vertical motion mechanism. Also, the working machine is provided by constituting that on rotating the machine body, the ground-leveling device (8) is moved upward to the storage position by the action of the vertical motion mechanism.

Description

  The present invention relates to a working machine such as a tractor or a rice transplanter.

  In Patent Document 1, a traveling unit base is attached to a rear end portion of an elevating link device provided at a rear portion of a traveling vehicle body, and a leveling base is supported on the traveling unit base so as to freely roll left and right via a leveling rolling shaft. Discloses a seedling transplanting machine having a configuration in which a leveling device capable of moving up and down is mounted and supported, and a working part (seedling planting part) is supported so as to be freely rolling left and right via a planting rolling shaft.

JP 2006-129827 A

The subject of this invention is preventing the interference of a leveling apparatus.

In order to solve the above problems, the present invention has taken the following technical means.
That is, according to the present invention, the vertical link (51) can be moved up and down via the lift link device (3) on the rear side of the traveling vehicle body (1), and the vertical link (51) has a vertical movement mechanism ( 90), the leveling device (8) is supported so as to be movable upward to the storage position, and the working part (4) is attached via the detachable hitch (53) attached to and detached from the vertical link (51). A locking device (59) is provided for locking so that the detachable hitch (53) does not come off in the state, and a rolling shaft (24) for rolling the working unit (4) and the leveling device (8) together is provided, and the working unit (4). The working machine is configured to move the leveling device (8) upward to the stowed position by operating the vertical movement mechanism (90) when the ascending position is raised .

According to the second aspect of the present invention, a vertical link (51) is provided on the rear side of the traveling vehicle body (1) via an elevating link device (3) so as to be movable up and down, and a vertical movement mechanism (90) is provided on the vertical link (51). The leveling device (8) is supported so as to be able to move upward to the storage position, and the working part (4) is attached via the detachable hitch (53) attached to and detached from the vertical link (51). A locking device (59) is provided for locking so that the detachable hitch (53) does not come off, and a rolling shaft (24) is provided for rolling the working unit (4) and the leveling device (8) left and right. The working machine is configured to move the leveling device (8) upward to the storage position by the operation of (90) .

According to the third aspect of the present invention, there is provided a stand (93) provided with a cradle (93a) for supporting the working part (4) when it is detached from the traveling vehicle body (1) , and the stand (93) supports it. When the working unit (4) is to be mounted on the vertical link (51) , the leveling device (8) in the lowered working position and the stand (93) are set at a related position where they interfere with each other. The working machine described in Item 2 .

In short, according to the first aspect of the present invention, the leveling device 8 can be prevented from interfering with, for example, the rear wheels .
According to the second aspect of the present invention, it is possible to prevent the ground leveling device 8 from interfering with the left and right shaking at the time of turning, and to make a good turn .

According to the third aspect of the present invention, in addition to the effect of the first or second aspect of the invention , the stand 93 can be attached to the leveling device 8 when the working unit 4 is removed and the working unit 4 is mounted thereafter. By interfering with each other, it is possible to avoid dangers such as dropping of the working unit 4 due to movement or posture change, and the work unit 4 can be safely attached and detached.

Side view of pot type seedling transplanter Top view of the main part Enlarged side view of the main part at the rear of the aircraft Side view of essential parts showing support structure of leveling device Enlarged side view of the main part of the detachable hitch mechanism Plan view of main part of support structure of leveling device Side view of the main part of the seedling planting work department Side view of seedling box supply section and seedling box transport section Control block diagram of seedling box supply Cross-sectional view of the drive case S1-S1 sectional view of FIG. Control block diagram Rear view of the main part showing the vertical movement mechanism of the leveling device Side view of stand Top view of the operation box Top view of the operation box Perspective view showing marker operating mechanism

An embodiment of the invention will be described with reference to the drawings.
As an example of a working machine (agricultural working machine), the seedling transplanting machine shown in the side view of FIG. 1 is an 8-row pot-type seedling transplanting machine, and a pair of left and right front wheels 6 and 6 that can be steered. A pot-type seedling planting work unit 4 is provided on the rear side of the traveling vehicle body 1 having a pair of driving rear wheels 7 and 7 via an elevating link device 3 configured with upper and lower links and provided with a rolling adjusting unit at the rear end. Is mounted so as to be able to move up and down, and a leveling device 8 is provided in front of the float 5 provided below the pot type seedling planting work unit 4.

The leveling device 8 is attached to the rear end of the lift link device 3 and is pot-type via an extension frame 9 formed by upper and lower frames extending from the lift link device 3 on the extension line of the upper and lower links at a position away from the rear end thereof. The seedling planting work unit 4 is supported. In addition, a steering handle 12 for steering the front wheels 6, 6, a steering seat 13, a spare seedling table 15, a drawing marker 16, and the like are provided on the front side of the fuselage, and a fertilizer 17 is provided behind the steering seat 13. A shift lever 14 is provided near the steering handle 12 and the operation box 2 to control the shift of the traveling speed via an HST (hydraulic continuously variable transmission).
(Seedling planting department)
Explaining in detail about each device of the seedling planting work section, the pot type seedling planting work section 4 according to the configuration example of the eight-row planting has flexibility as shown in FIG. In order to handle many seedling pots in a grid-like arrangement on the seedling tray and store each seedling one by one and hold it in the seedling box, the top and bottom are inclined to the rear after common use in two adjacent strips. Four sets of two-stage pot seedling box introduction sections 30, 30... Are provided in parallel on the left and right, and the seedling box main transport paths 31, 31. Are connected to form a transfer unit for transferring the seedling box.

  Each seedling box main transport path 31 transports seedling boxes supplied one by one in order from the upper and lower two-stage pot seedling box introduction sections 30 and 30 downward in the first half, and gradually moves the transport direction along the arc from the middle. In the second half, it is formed in a substantially U shape in a side view to convey upward, and is connected to the terminal portion of the seedling box main conveyance path 31 to provide a plurality of empty seedling boxes after the seedlings are taken out at the seedling removal position. There is provided an empty box accommodating portion 38 that can be accommodated in a state of being stacked one above the other. The seedling box main transport path 31 is provided with a seedling box supply device by a supply roller that feeds the seedling box in the pot seedling box introduction section 30, and the placed seedling box is the bottom surface of the pot seedling box introduction sections 30, 30. It slips backward by its own weight along the slope by the idle roller.

In addition, a seedling box feeding mechanism that transports the seedling box along the seedling box transporting path corresponding to each seedling box main transporting path 31, and a seedling box that is being transported at the seedling extraction position located at the lower end of the transporting path 31 A seedling extraction mechanism 33 for extracting seedlings from the pot side by row, a seedling transport mechanism 34 for transporting the extracted seedlings with a trajectory that draws an arc on the lower front side, and a seedling removal mechanism 35 for extracting seedlings from the seedling transport mechanism , A seedling lateral feed mechanism 36 that laterally feeds to the left and right sides of each half of the horizontal row extracted by the seedling removal mechanism 35, and a seedling planting mechanism that takes the seedling supplied by the seedling lateral feed mechanism 36 and plantes it in the field 37, etc., and a planting case 32 is integrally formed with a drive case and a planting transmission frame, and a pot seedling box introduction section having two upper and lower stages via a seedling support frame. 30 is supported.
(Leveling equipment)
In the embodiment shown in FIG. 3, the leveling device 8 includes two leveling rotors 41, 41 arranged front and rear for crushing the soil mass and leveling the field, and a suspension wire 42 a and a suspension link for supporting the front and rear thereof from above. 42b is comprised, and this is arrange | positioned in the downward position of the pot type seedling planting part 4 so that height adjustment is possible.

  The suspension link 42b is provided with a vertical frame 43 at the rear end portion of the lifting / lowering link device 3, and is connected to the vertical frame 43 through two upper and lower links 45 and 46 so as to be movable up and down, and is adjustable to be swingable. The lever 44 is configured to be height adjustable. The adjusting lever 44 is disposed at a position between the two empty box accommodating portions 38 while avoiding interference with the swing range.

  In this case, the leveling device 8 is configured to be bent at a position below the empty box housing portion 38 and the suspension link 42b is bent so as to be parallel to the bent shape of the pot-type seedling planting portion 4. The space A on the front side of the seedling planting part 4 can be used effectively, and the link can be configured without extending more than necessary. Further, when the adjustment lever 44 is disposed under the empty box housing portion 38, it can be opened and closed without obstructing the hopper.

  In the above configuration, the leveling device 8 is supported at the rear end position of the lifting link device 3, and the pot-type seedling planting work unit 4 is supported at a position via the extension frame 9 extending rearward of the lifting link device 3. Thus, both are supported by the lifting link device 3 at the rear of the machine body so as to be able to move up and down integrally, and pot seedlings are planted on the leveling field, and the front side of the pot type seedling planting work unit 4 is between the leveling device 8 and Thus, a maintenance space A is secured. Accordingly, the application range can be expanded by the leveling device 8 for various field conditions, and the planting unit 32 is provided by the maintenance space A on the front side of the planting device 32 of the pot type seedling planting work unit 4. It is possible to immediately respond to abnormal situations and to ensure the work efficiency of pot seedling planting.

  Next, the leveling device support structure, which is a feature of the present invention, will be described. As shown in FIG. 4, a vertical link 51 that moves up and down at the rear end portion of the lifting link device 3 provided on the rear side of the traveling vehicle body 1 is provided. A mounting frame 52 that rolls left and right via a rolling shaft 24 in the front-rear direction provided on the vertical link 51 is provided on the rear side of the vertical link 51. Agricultural work part (seed planting work part) 4 is disposed on the rear side of the attachment frame 52 through a detachable hitch 53 and an extension frame 9 that are attached to and detached from the attachment frame 52. The detachable hitch 53 is provided with locking tools 53a, 53a that are received and held in engaging recesses 52a, 52a provided in the mounting frame 52. An opening / closing locking tool 58a swingable around a fulcrum Q that locks the locking tool 53a so as not to be disengaged from the engaging recess 52a between the mounting frame 52 and the detachable hitch 53 attached to the mounting frame 52; A lock device 59 including a lock release lever 58b is provided. The lock device 59 detects a lock detection switch 77 that detects a lock state by the lock release lever 58b, a lock release restriction pin 78 that restricts lock release by the lock release lever 58b, and a removal state of the detachable hitch with respect to the mounting frame. A removal state detection device (removal state detection switch) 79 is provided. Based on the detection result of the lock detection switch 77, the lock release restriction pin 78 is configured so that the control unit 19 outputs to the lock release restriction solenoid 80 to restrict the movement of the lock release lever 58b in the lock release direction. .

  A stand 93 is provided below the working unit 4 to receive and support the working unit from below when the working unit is removed from the traveling vehicle body. The stand 93 includes a cradle 93a, a caster 93b, a hexagonal support shaft 93c that fits and supports the support boss 4a of the working unit, a rope hook 93d, and the like. It can be moved to the ground. The stand 93 is in a state where the working unit 4 is supported, and when the working unit is to be mounted on the vertical link 51, the leveling device 8 is not in the upper storage position but in the lower working position. Is set at a position where the stand 93 interferes with the leveling device 8.

  Further, the mounting frame 52 is provided with leveling device support frames 54 and 54 extending rearward from the mounting frame through a leveling support member 57, and the leveling device support frames 54 and 54 are provided with the leveling device support frame. Connecting the leveling frame 56 to the vertical rotation arms 55u and 55d to support the leveling device 8 so that the leveling device 8 can be rotated up and down. The leveling device support frames 54 and 54 are connected to the vertical leveling arms 55u and 55d. And the leveling frame 56 are arranged so as to overlap each other when viewed from the side of the body. Therefore, according to such a configuration, only the seedling planting work part can be replaced with a different type of farm work part while leaving the leveling device on the traveling vehicle body side by the detachable hitch, and the seedling planting work part by the rolling shaft. Both the leveling device can be rolled left and right. In addition, the support structure that supports the leveling device so that it can be moved up and down can be made strong while obtaining a sufficient vertical stroke, and this leveling device can be placed forward, and the farming section is also moved to the traveling vehicle side. It can be arranged, and the front and rear balance of the aircraft can be performed well.

  The leveling device support frames 54 and 54 are disposed at the left and right positions of the leveling frame 56 so that the vertical movement of the leveling frame 56 is guided by the left and right leveling device support frames. It is configured so that it can move up and down smoothly.

  As the vertical movement mechanism of the leveling device 8, in the embodiment shown in FIG. 13, when the vertical adjustment lever 44 is rotated in the direction of arrow A, the operation arm 90a, the rotation shaft 90b, the swing link 90c, the lifting rod 90d, etc. When the leveling device 8 is moved upward to the upper storage position through the vertical movement mechanism 90 and is turned in the direction of the arrow B, the leveling device 8 is moved downward through the vertical movement mechanism 90. It moves down to the position. The vertical adjustment lever 44 is provided with a rotor vertical position sensor 91 that detects the vertical position of the leveling device 8. As another embodiment of the leveling device vertical movement mechanism 90, as shown in FIG. 4, the leveling device can be controlled to move up and down by the operation of the rotor vertical movement motor 92. For example, when the rotor vertical position sensor 91 detects the rotor raising position by the vertical adjustment lever 44, the leveling device 8 can be automatically linked to the upper storage position by the operation of the rotor vertical movement motor 92. .

  As shown in FIG. 12, when the leveling device 8 is not in the stowed position, the control unit 19 has a lifting link device that locks the lifting electromagnetic hydraulic valve 27 in the neutral position and prevents the lifting hydraulic cylinder 26 from operating. 3 is provided in the form of a program.

  Furthermore, when the working unit 4 is to be removed from the vertical link while the leveling device 8 is in the working position, the lock device (59) is to be unlocked for removal, but the leveling device is in the storage position. If not, the control unit 19 is provided with lock release restriction control means (B) for restricting the unlocking of the lock device 59.

  Further, when the working unit 4 is removed from the vertical link 51, when the unlocking or removal state detecting device 79 of the locking device 59 detects the removal state of the working unit, the leveling device 8 is moved to the upper storage position based on the detection result. The control unit 19 is provided with a leveling device up-motion control control means (C) so as to automatically move up.

  When the working unit is mounted, if there is a forward / backward angle change on the machine side, the hydraulic pressure is stopped so that the lifting hydraulic cylinder 26 does not operate. In other words, when the tilt sensor 95 detects the tilt of the front and rear of the machine more than a predetermined level, the hydraulic pressure to the elevating electromagnetic hydraulic valve 27 is stopped so that the operator notices that it is difficult to mount the working unit. It is possible to urge the user to attach the working unit after returning to a normal horizontal posture.

  When removing the working portion, if the sub-shift lever 11 is not in the PTO position, the lock device 59 is prevented from being unlocked (the lock is released only when the sub-shift lever sensor 96 detects the “PTO” position). By doing so, there is no risk of the aircraft moving unexpectedly as in the case where the auxiliary speed change lever is in the moving speed (high / low speed) range, and the working part can be removed safely.

  In a state where the working unit is removed, the microcomputer may be controlled so that the operating speed of the HST (hydraulic continuously variable transmission) during traveling on the road is within the range in which the machine maintains the horizontal level in the front-rear direction. According to this, traveling on the road can be performed safely.

In the turn to turn the aircraft, in the normal turn that turns automatically by turning off the side clutch of the rear wheels inside the turn (hereinafter referred to as " Kurt Turn "), The rear wheels on the inside of the turn in the field of the cultivator do not rotate smoothly due to the resistance, and the field may be damaged by the rear wheels, so the inside of the turn with respect to the rotation speed (rotational speed) of the rear wheels outside the turn When the rear wheel rotation speed (rotational speed) falls below the predetermined speed (one fifth of the rotation speed of the rear wheel outside the turn), the side clutch inside the turn is forcibly turned “on” and There is a turn (hereinafter referred to as a “pumping turn”) that turns while forcibly driving the wheel by a predetermined rotation amount (travel distance of about 67 mm). As shown in FIG. 15, a pumping clutch adjustment dial 97 (see the control circuit diagram of FIG. 12) installed on the operation box 2 changes and adjusts the predetermined rotation amount of the turning inner rear wheel. The pumping turn itself can be turned off. When the pumping clutch adjustment dial 97 is at a position other than the pumping turn “off” and the steering angle is an angle for operating the pumping turn, the leveling device is automatically retracted based on the detection result of the steering angle sensor 98. If the related configuration is made, it is possible to eliminate the interference of the leveling device to the field scene due to the left and right shaking of the airframe during the turning, and the turning can be performed well. In FIG. 12, reference numeral 103 denotes a rear wheel rotational speed detection sensor provided on the input side of the control unit 19, and reference numeral 104 denotes a side clutch operation electromagnetic hydraulic valve provided on the output side of the control unit 19.

  Further, when the working unit 4 is raised, the leveling device 8 is always moved up by the operation of the rotor vertical movement motor 92 so that the leveling device 8 is at the storage position, and when the working unit is lowered to the working position, the leveling device returns to the original set height. It can be constituted as follows. According to this, when the leveling device remains in the working position during turning or on a rough road, the problem that the leveling device interferes with the rear wheel when the rear wheel rolls can be solved.

  The overall configuration of the pot-type seedling planting operation unit will be described in more detail. The raising / lowering operation of the seedling planting operation unit 4 can be manually operated based on the operation of the planting / elevating switch 10 provided in the grip portion of the transmission lever 14. The seedling planting work unit 4 is moved up and down by an elevating hydraulic cylinder 26 that extends and contracts via an elevating electromagnetic hydraulic valve 27.

  Four sets of upper and lower two-stage seedling box supply units 30 are provided in parallel on the left and right sides, and a seedling box main transport unit 31 is connected to the end of each group of seedling box supply units. An empty box storage unit 38 that can be connected to the terminal end of the seedling box main transport unit 31 and can store a plurality of empty seedling boxes after the seedlings are taken out at the seedling extraction position P, which will be described later. Is provided. A guide body 40 for guiding the empty box from the upper side is provided at a portion corresponding to the joint between the empty box guide rails 39a and 39b, and the seedling box is smoothly moved around.

  An idling roller 20 is provided on the bottom surface of the seedling box introducing section 30 so that the seedling box placed on the seedling box slides backward due to its own weight. At the rear end of each seedling box introduction section 30, as a supply device 29 for supplying the seedling box to the transport path of the seedling box seed transport section 31, the right and left edges of the seedling box are gripped and the seedling box is moved to the main transport section side. A pair of left and right supply rollers 21 and 22 that are fed out, and a wide feed roller that is positioned in front of the supply roller and that has a protrusion formed on the outer peripheral portion engaged with the gap between the pot from below to feed the seedling box 23. The lower supply roller 22 and the feed roller 23 of the upper and lower seedling box supply unit are driven to rotate by motors M1 and M2, respectively.

  A planting transmission frame 47c extends rearward from the lower side of the frame 47b integrated with the drive case 47a, and a seedling support frame 47d is fixed to the upper surface of the drive case 47a to support the seedling box introducing portion 30. Yes. The rolling shaft 24 is rotatably supported by a bearing case 50 attached to the planting part support bracket 48, and the leveling device and the entire planting part are supported so as to be able to roll freely. The entire planting part is based on the detection value of the rolling sensor (left / right tilt angle sensor) 28, and the rolling motor 25 is driven forward / reversely by a signal from the control device (controller) so that the detection value is maintained at the set value. Thus, left and right rolling control is performed around the rolling shaft 24.

  The seedling box feeding mechanism is composed of a pair of left and right feeding claws 60, 60 and locking claws 61, 61. By these operations, the seedling box is intermittently moved along the seedling box transport path 31 by one pitch of the pot arrangement. To be sent to. On the upper side of the feeding claws 60, 60 and the locking claws 61, 61, blocking claws 63, 63 for temporarily receiving the succeeding seedling box sliding down the seedling box transport path 31 are provided.

  By rotation of the seedling box feeding cam 65, the seedling box feeding operating arm 66 swings and is transmitted to the seedling box feeding driving arms 70, 70 via the seedling box feeding driving shaft 69, and reciprocates the feeding claws 60, 60 up and down. Move. When the cam 65 pushes the roller 67, the feed claws 60, 60 move downward to feed the seedling box. The transmission shaft 64 that transmits and rotates the cam 65 is provided with a fixed position stop clutch 64b that enters and exits transmission by an external operation on a cylindrical body 64a that rotates integrally therewith.

  As shown in FIG. 7, the seedling transport device 34 includes a seedling holder 83 that holds a bed soil portion of the seedling pushed out from the seedling box by the seedling pushing pin. The seedling holder 83 is fixed to a support member 86 connected to the upper and lower swing links 84 and 85, and reciprocates along an arc locus by swinging the swing links 84 and 85. Yes. Further, when the seedling holder 83 is planted, the seedling holder stop position when the planting clutch or the heel clutch 64b is disengaged is stopped at a phase near the bottom dead center, and the seedling holder 83 is washed in a direction to take the seedling. It stops in the fountain zone (A) fountained from the nozzle 89.

  Further, in FIG. 7, the seedling planting mechanism 37 has a pair of seedling planting tools 102 and 102 attached to a rotating case 101 that rotates integrally with the planting drive shaft 100, and this seedling planting tool draws a closed loop locus. The seedlings are alternately taken and planted in the field.

  In the configuration example shown in FIG. 8, the seedling box detection sensors SW1 to SW7 are connected to a controller as shown in FIG. 9, and based on information from each sensor, the controller 72 performs motors M1 and M2, seedling reduction lamps and Output to the seedling reduction buzzer. By the operation of the motor M1 or M2, the seedling box in the seedling box supply unit is fed out to a predetermined position of the main transport unit. At this time, even if the motor M1 or M2 is operated for a predetermined time or more, If the seedling box detection sensor W3 is not sent to the predetermined position, the seedling box detection sensor W3 is turned off, and is output to the seedling box feed failure alarm device BZ to notify the operator.

  In the seedling box automatic supply device, when the motors MI and M2 that feed the upper and lower conveyance paths are operated, the controller 72 outputs to the transmission motor 74 (HST operation) so that the vehicle speed is slightly slower than a predetermined speed. It is configured to control. If the vehicle speed is high when the seedling box is supplied, there is a problem that the seedling box supply becomes unstable due to shaking of the vehicle body. However, by slowing down the vehicle speed, the seedling box automatic supply is stabilized and the accuracy is improved.

The speed change motor 74 is driven based on the detection result of the speed change lever sensor 73 by the operation of the speed change lever 14 so that the vehicle speed is arbitrarily controlled.
A saddle clutch lever 75 is provided on the left and right sides of the control seat 13. When the 畦 clutch lever 75 is operated, the 畦 clutch is set to “disengaged”, and then the planting clutch motor 76 is operated to set the planting clutch to “off” and the planting clutch is set to “on” again. After the seedling implanter 102 of the part turns about one stroke, the aircraft is configured to start running. As a result, planting work while running can be performed without missing.

In the marker operating device 105, the “automatic” position for switching the left and right markers 16 and 16 to be drawn to the left and right for each turn, the “both exit” position for drawing with both the left and right markers, and the marker is always in a non-drawing state. A marker switching switch 106 for switching to the “off” position, and a left / right switching button 107 for switching the marker to be drawn alternately to the left and right each time the button for switching the marker to be drawn to the left and right side is pressed, and based on a command from the marker operating device 105 Te, solenoid 108 is actuated markers, in conjunction with the lifting of the seedling planting working portion 4 is drawing marker is adapted to operate or standing working collapsed.

  Only when the drawing marker is in the drawing action position, the engine rotation speed is automatically increased by the operation of the accelerator motor 109 by the operation of raising the seedling planting work section of the planting / elevating switch 10 to activate the marker. Interlocking configuration is used to increase the lift speed. According to such a configuration, since the water wheel marker is easy to get mud and heavy, the load of raising the marker becomes large, and the problem that the lift speed becomes slow can be solved.

It should be noted that even when the seedling planting section is backlifted, the engine speed can be automatically increased to increase the hydraulic pressure increase speed .

Claims (3)

A vertical link (51) is provided on the rear side of the traveling vehicle body (1) via an elevating link device (3) so as to be movable up and down, and a leveling device (8) is provided on the vertical link (51) via a vertical movement mechanism (90). The working part (4) is mounted via a detachable hitch (53) that is supported so as to move upward to the storage position and is attached to and detached from the vertical link (51) so that the detachable hitch (53) does not come off when the working part is mounted. A locking device (59) for locking is provided, and a rolling shaft (24) is provided for rolling the working unit (4) and the leveling device (8) both left and right. When the working unit (4) is raised, the vertical movement mechanism (90) is operated. A working machine configured to move the leveling device (8) up to the storage position by the above . A vertical link (51) is provided on the rear side of the traveling vehicle body (1) via an elevating link device (3) so as to be movable up and down, and a leveling device (8) is provided on the vertical link (51) via a vertical movement mechanism (90). The working part (4) is mounted via a detachable hitch (53) that is supported so as to move upward to the storage position and is attached to and detached from the vertical link (51) so that the detachable hitch (53) does not come off when the working part is mounted. A locking device (59) for locking is provided, a rolling shaft (24) for rolling the working unit (4) and the leveling device (8) together is provided, and the leveling device (90) is operated by the operation of the vertical movement mechanism (90) when the aircraft is turning. A working machine configured to move 8) to the storage position . A stand (93) provided with a cradle (93a ) that supports the working part (4) when it is removed from the traveling vehicle body (1) is provided, and the working part (4) is vertically linked while being supported by the stand (93). The work implement according to claim 1 or 2, wherein the work implement is set at a relational position where the leveling device (8) in the lowered working position and the stand (93) interfere with each other when trying to be mounted on (51) .

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