JP2009039023A - Working implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working implement that can stably maintain a self-standing posture. <P>SOLUTION: The working implement has the following configuration. A ground working part 11 is set on the lower side of a machine frame 2 and a supporting frame 29 is set up so as to extend rearward from the machine frame 2. The front of the supporting frame 29 is pivoted on the machine frame 2 so that the supporting frame 29 is vertically swingable. A lift-operating mechanism 34 functioning to vertically swing the supporting frame 29 is set up in between the supporting frame 29 and the machine frame 2. At least three stands 44, 45 supports the machine frame 2 on the ground, at least one of these stands 44, 45 is set up on the front of the ground working part 11 and fitted on the machine frame 2, and the remaining stands 45 are set up on the rear of the ground working part 11 and fitted on the supporting frame 29, so that the ground working part 11 is supported in a condition of being kept apart from the ground by lowering the supporting frame 29. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a working machine having a ground working unit on a lower side of a machine frame such as a rotary tiller or a rotary harrow.

Conventionally, as a work machine, support arms are protruded from the gear case to which power from the PTO shaft of the tractor is input, and a chain case is connected to the end of the left support arm and a side frame is connected to the end of the right support arm. A rotary cultivator comprising a rotary cultivator with a plurality of cultivating claws attached to a claw shaft supported between the chain case and the lower part of the side frame is formed at the lower part of the machine frame. is there.
In this rotary tiller, it is mounted so that it can be raised and lowered via a three-point link mechanism attached to the rear part of the tractor, and when the rotary tiller is separated from the tractor, the rotary tiller is allowed to stand by itself. Is provided with a stand (see Patent Document 1).

In this conventional rotary cultivator, one stand is disposed on the rear side of the rotary cultivator, and is attached to the rear side of the support frame extending rearward from the machine frame. When detached from the tractor, the stand supports the rear side of the rotary tiller with the rotary tiller being in contact with the ground.
Japanese Utility Model Publication No. 7-29773

In the rotary cultivator, since the rotary cultivator is grounded, the rear side of the rotary cultivator is supported by one stand arranged behind the rotary cultivator. There is a problem in terms.
Then, in view of the said problem, this invention aims at providing the working machine which can be made to stand stably stably.

  The technical means taken by the present invention in order to solve the technical problem includes a ground working section on the lower side of the machine frame and a support frame extending rearward from the machine frame. The support frame is pivotally supported on the machine frame so that the support frame can swing up and down, and a lifting operation device that swings the support frame up and down is provided between the support frame and the machine frame. And at least one of the stands is disposed on the front side of the ground working unit and attached to the machine frame, and the remaining stand is disposed on the rear side of the ground working unit. The ground working unit can be supported in a state of being lifted from the ground by lowering the support frame.

Moreover, it is good to provide the grounding ring which can be earth | grounded and can roll on the lower end side of each stand.
Further, it is preferable that a connecting portion connected to a work implement mounting device provided in the tractor is provided on the front side of the machine frame, and a stand arranged on the front side of the ground working portion can be attached using the connecting portion.

  According to the working machine of the present invention, it is configured so that the ground working part can be supported in a state of being lifted from the ground by the stands arranged before and after the ground working part, so when the work machine is removed from the tractor or the like The work machine can be made stable and independent.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, reference numeral 1 denotes a rotary tiller, and the rotary tiller 1 is detachably connected to a traveling body such as a tractor via a mounting device such as a three-point link mechanism. It has.
The machine frame 2 includes a gear case 3 disposed on the center side in the left-right direction, left and right support arms 4 projecting from the gear case 3 on the left and right sides, and a protruding end (left end) of the left support arm 4. Is composed mainly of a transmission case 5 connected to each other and a side frame 6 whose upper part is connected to the protruding end (right end) of the right support arm 4.

In addition, in this Embodiment, although the side drive type rotary tiller 1 is employ | adopted, you may employ | adopt a center drive type rotary tiller.
A top mast 7 that is bifurcated forward and backward is fixed to the upper portion of the gear case 3, a connection bracket 8 is fixed to each of the left and right support arms 4, and a front upper portion of the top mast 7 and each of the left and right connection brackets 8 are In addition, connecting portions 9 and 10 for connecting the rotary tiller 1 to the tractor are provided (the connecting portion 9 provided on the top mast 7 is called an upper connecting portion, and the connecting portion 10 provided on the connecting bracket 8 is Called the bottom link).

The upper connecting portion 9 and the lower connecting portion 10 are composed of pins having a horizontal axis, and the upper connecting portion 9 is connected to the rear end side of the top link of the three-point link mechanism (or the rear end of the three-point link mechanism). When the hitch frame is connected to the side, it is engaged with the upper connected portion provided on the upper side of the hitch frame), and the left and right lower connecting portions 10 are the rear end sides of the left and right lower links of the three-point link mechanism (Or, when the hitch frame is connected to the rear end side of the three-point link mechanism, it is connected to the lower cover connecting portions provided on the left and right sides of the lower side of the hitch frame).
The pins constituting the lower connecting portion 10 are referred to as lower link pins.

In the present embodiment, each of the left and right support arms 4 includes an inner portion 4A that is integrally extended from the gear case 3, and an outer portion 4B that is coupled to the inner portion 4A. The left and right inner surfaces of the connecting bracket 8 are welded and fixed to the left and right outer ends of the inner portions 4 </ b> A of the left and right support arms 4, and the left and right inner ends of the outer portions 4 </ b> B of the support arm 4 are fixed to the left and right outer surfaces of the connecting bracket 8. The side is fixed by welding.
A rotary tiller 11 is provided at the lower part of the machine casing 2.
The rotary tiller 11 includes a claw shaft 12 that is rotatably supported around the left and right axial centers between a lower portion of the transmission case 5 and the side frame 6, and a cultivation claw 13 attached to the claw shaft 12. It consists mainly of:

The gear case 3 of the machine frame 2 is provided with a PIC shaft 15 for inputting power from the PTO shaft of the tractor to the bevel gear transmission mechanism 14 in the gear case 3 through a universal joint or the like. The power input from the PIC shaft 15 is provided. Is transmitted from the bevel gear transmission mechanism 14 to the chain transmission mechanism 17 in the transmission case 5 via the transmission shaft 16 in the left support arm 4, and further transmitted from the chain transmission mechanism 17 to the claw shaft 12 to the claw. The shaft 12 is configured to be driven to rotate in the direction of arrow A in FIG.
Further, the rotary tiller 1 is provided with a tillage cover 18 that covers the rotary tiller 11.

The tillage cover 18 includes a main cover 19 that covers the upper side of the rotary tiller 11, a rear cover 20 that covers the rear side of the rotary tiller 11, and a leveling cover 21 that is detachably attached to the lower end side of the rear cover 20. And a side cover 22 that covers both the left and right sides of the rear side of the rotary tiller 11.
The rear cover 20 is pivotally supported on a side plate 23 fixed to the transmission case 5 and the side frame 6 so as to be rotatable about a support shaft 24 having a horizontal axis, and can swing up and down. Has been.

Further, the rotary tiller 1 is provided with a pair of left and right lowering devices 28 for urging the rear cover 20 downward across a front bracket 26 provided on the machine frame 2 and a rear bracket 27 provided on the rear cover 20. It has been.
Further, the rotary tiller 1 is provided with a support frame 29 extending rearward from the machine frame 2.
The support frame 29 includes a pair of left and right side frame members 30, a connecting frame member 31 that connects midway portions in the front-rear direction of the left and right side frame members 30, and a rear frame member fixed to the rear end side of the left and right side frame members 30. 32 (toolbar).

Each of the left and right side frame members 30 is configured to be extendable in the front-rear direction from a front outer cylinder 30A and a rear inner cylinder 30B inserted in the outer cylinder 30A from the rear end side so as to be movable in the front-rear direction. At the same time, the inner cylinder 30B can be fixed to the outer cylinder 30A so as not to be relatively movable in the front-rear direction.
The length of the side frame member 30 is increased by releasing the fixing means and moving the inner cylinder 30B relative to the outer cylinder 30A and then fixing the inner cylinder 30B to the outer cylinder 30A again by the fixing means. Is adjustable.

Each of the left and right outer cylinders 30A is pivotally attached to the rear end side of the connecting bracket 8 on the same side in the left-right direction via a pivot 33 so as to be rotatable about a left-right axis. The support frame 29 can swing up and down as a center.
The connection frame member 31 connects the rear side of the left and right outer cylinders 30A, and the rear frame member 32 is disposed along the left-right direction and is fixed to the rear ends of the left and right inner cylinders 30B.
Between the support frame 29 and the machine frame 2, an elevating operation device 34 that swings the support frame 29 up and down is provided.

As shown in FIG. 4, the lifting operation device 34 is provided across a holder 35 provided on the upper rear side of the top mast 7 and a mounting bracket 36 provided on the holder 35 and the connecting frame member 31. A telescopic rod 37 that is extendable in the length direction and an operation handle 38 that is operated to expand and contract the telescopic rod 37, and the support frame 29 is swung up and down by extending and retracting the telescopic rod 37. Has been.
The holder 35 is attached to the upper part of the rear side of the top mast 7 so as to be rotatable around a horizontal axis.

The telescopic rod 37 has a screw rod 41 whose one end in the axial direction is pivotally supported by the holder 35 around the axial center and is immovably supported in the axial direction, and has an external thread formed on the outer surface. A cylindrical rod 42 having a nut portion 42a screwed to the other end side is provided on one end side in the axial direction, and the other end side of the cylindrical rod 42 is axially centered in the left and right direction via the support shaft 39 to the mounting bracket 36. It is pivotally pivoted around.
The operation handle 38 is attached to one end side of the screw rod 41 and rotates the screw rod 41 about its axis, and is in a non-use posture along the holder 35 and protrudes radially outward from the screw rod 41. The posture can be freely changed according to the usage posture.

Further, the lifting operation device 34 is provided with a protective cylinder 43 that covers the screw rod 41, and the protective cylinder 43 is fixed to the holder 35.
In the ascending / descending operation device 34 having the above-described configuration, the operation handle 38 is rotated to rotate the screw rod 41 around the axis, whereby the nut portion 42a of the tube rod 42 is screwed into the screw rod 41 and screwed. The cylinder rod 42 is moved in the axial direction with respect to the rod 41, whereby the support frame 29 is configured to swing up and down around the pivot 33.
Further, in the present embodiment, three stands 44 and 45 that are grounded and support the machine frame 2 are provided, and two of the three stands 44 and 45 are arranged on the front side of the rotary tiller 11. The remaining one is disposed on the rear side of the rotary tiller 11 (the stand 44 disposed on the front side of the rotary tiller 11 is referred to as a front stand, and the stand disposed on the rear side of the rotary tiller 11) 45 is called the rear stand).

As shown in FIGS. 1 and 5, the front stand 44 includes a support 46, a mounting member 47 attached to the lower link pin 10, and a grounding ring 48 provided on the lower end side of the support 46.
The mounting member 47 is provided with a vertical wall 47a whose wall faces in the left-right direction, and extends inward in the left-right direction from the upper end of the vertical wall 47a (the direction from the left-right end of the rotary tiller to the left-right center). The upper wall 47b and the lower wall 47c extending inward in the left-right direction from the lower end of the vertical wall 47a are formed in a U-shaped cross section, and the insertion hole 49 through which the lower link pin 10 can be inserted into the rear part of the vertical wall 47a. Is formed.

The front end side of the lower wall 47c of the mounting member 47 is notched, and the upper portion of the support column 46 can be superposed on the front side of the vertical wall 47a of the mounting member 47 in the left-right direction. The upper part of the column 46 is fixed to the front side of the vertical wall 47a by welding or the like.
The grounding ring 48 is attached to the lower end side of the support column 46 so as to be rotatable around a horizontal axis.
The mounting member 47 of the front stand 44 has a laterally inner surface (the surface on which the upper and lower walls 47b and 47c are extended) of the vertical wall 47a on the laterally outward side of the connecting bracket 8 (rotary cultivator). The lower link pin 10 is attached to the lower link pin 10 by inserting the lower link pin 10 through the insertion hole 49 so as to face the surface in the direction from the center of 1 in the left-right direction toward the end in the left-right direction.

In this attachment state, the rear part of the upper wall 47b of the attachment member 47 engages with the upper edge of the connection bracket 8 and the rear part of the lower wall 47c of the attachment member 47 engages with the lower edge of the connection bracket 8. The rotation of the member 47 around the lower link pin 10 is restricted.
The grounding wheel may be a caster in which a wheel is attached to a bracket attached to the lower end side of the support column 46 so as to be rotatable about a vertical axis so as to be rotatable about a horizontal axis. .
As shown in FIGS. 1 and 6, the rear stand 45 includes a support column 51 and a grounding ring 52 attached to the lower end side of the support column 51.

A support bracket 53 is provided slightly to the left of the center portion of the rear frame 32 of the support frame 29 in the left-right direction, and a stand posture in which a rear stand 45 projects downward from the rear frame member 32 on the support bracket 53. And a non-use posture along the rear frame member 32 so that the posture can be changed.
The support bracket 53 includes an attachment wall 54 that is attached and fixed to the lower surface side of the rear frame member 32, and front and rear walls 50 and 51 that extend downward from the front and rear ends of the attachment wall 54.
The support column 51 is inserted between the front and rear walls 55 and 56 of the support bracket 53 and is attached to the support bracket 53 so as to be rotatable around the axial center in the front-rear direction by a support shaft 57 passing through the support column 51 and the front and rear walls 55 and 56. The posture of the rear stand 45 can be changed by rotating the support column 51 around the support shaft 57.

The column 51 is provided with a lock member 58, and the front wall 55 of the support bracket 53 is provided with a stand posture, a non-use posture in which the rear stand 45 is rotated to the right from the stand posture, and the rear stand 45. A fitting recess 59 for holding the rear stand 45 in each posture is formed by fitting the lock member 58 in each position of the non-use posture rotated to the left from the posture.
The lock member 58 is attached to the front end side of the support shaft 60 that passes through the support column 51 so as to be movable in the front-rear direction, and an operation member 61 is provided on the rear end side of the support shaft 60. A coil spring 62 is interposed between them in a compressed state.

When the operation member 61 is pushed forward against the biasing force of the coil spring 62, the lock member 58 moves forward to disengage from the fitting recess 59, and the support 51 is allowed to rotate around the support shaft 57. The lock member 58 is fitted into the fitting recess 59 by the biasing force of the coil spring 62 by releasing the pressing force of the operation member 61 in the stand posture or the non-use posture.
In the rotary cultivator 1 configured as described above, in order to remove the rotary cultivator 1 from the tractor, with the rotary cultivator 1 raised, the rear stand 45 is swung downward from a non-use posture to a stand posture, In this state, the rotary cultivator 1 is lowered to ground the grounding wheel 52 of the rear stand 45 and the rotary cultivating section 11 (cultivation claw 13), and the three-point link mechanism is separated from the rotary cultivator 1.

Thereafter, the rotary tiller 1 is self-supporting in a state where the stand 45 and the tilling claw 13 are in contact with each other.
In this state, when the left and right front stands 44 are attached to the machine frame 2, the grounding ring 48 of the front stand 44 is attached in a state where it slightly floats from the ground.
In this state, when the operation handle 38 is rotated to lower the support frame 29, the ground ring 48 of the front stand 44 is grounded and the rotary tiller 11 is lifted from the ground L.
Thereby, the rotary tiller 1 can be supported by the front stand 44 and the rear stand 45 in a state where the rotary tiller 11 is lifted from the ground, and the rotary tiller 1 can be stably supported.

Further, the front stand 44 and the rear stand 45 are respectively provided with grounding wheels 48 and 52, and when the rotary tiller 1 is supported by the front stand 44 and the rear stand 45, the rotary tiller 11 is separated from the ground L. Since it is in a floating state, the rotary cultivator 1 can be moved.
Further, when the rotary tiller 1 is moved on a truck or the like, it is better not to move the rotary tiller 1. In this case, the rotary tiller 1 is rotated by the front stand 44 and the rear stand 45. The part 11 is supported and moved in a floating state and placed on a loading platform such as a truck. After placing on the loading platform, the rotary tiller 1 is lowered by raising the support frame 29 and the rotary tilling unit 1 is placed on the loading platform. It is possible to prevent the rotary cultivator 1 from moving.

The front stand 44 and the rear stand 45 can be changed in design. For example, the grounding rings 48 and 52 may not be provided on the front stand 44 and the rear stand 45.
Further, the rear stand 45 may be held in each posture by a pin penetrating the support column 51 and the front wall 55 of the support bracket 53.
FIG. 7 shows another embodiment. In this embodiment, a gauge ring 63 is used as a rear stand.
A pair of left and right gauge wheels 63 are provided, and are attached to both left and right sides of the rear frame 32 of the support frame 29.

In this case, the front stand 44 may be one.
In this embodiment, an example in which there are three stands is shown. However, four stands may be provided, and at least three stands are provided, and at least one of these stands is located on the front side of the rotary tillage unit 11. It is arranged and attached to the machine frame 2, the remaining stand is arranged on the rear side of the rotary tiller 11 and attached to the support frame 29, and the rotary tiller 11 is lifted from the ground by lowering the support frame 29. What is necessary is just to be comprised so that the machine frame 2 can be supported.
In the present embodiment, the front stand 44 is attached to the lower link pin 10, but the present invention is not limited to this. The bracket and the pin for attaching the front stand 44 are separately attached to the machine frame 2 (support arm). It may be provided in 4).

In this case, the front stand 44 may not be detachable from the machine frame, and may be freely changeable between a stand attitude capable of supporting the machine frame and a retracted attitude retracted from the stand attitude.
Moreover, you may employ | adopt this invention for the other working machine which has ground work parts, such as a rotary harrow.

It is a side view of a rotary tiller. It is a schematic front view of a rotary tiller. It is a back surface expanded view of a rotary tiller. It is side surface partial sectional drawing of the attachment part of a raising / lowering operation apparatus. (A) is a BB line arrow figure of FIG. 2, (b) is CC line arrow cross section of (a). (A) is a rear view of a rear stand, (b) is a side sectional view of a mounting portion of the rear stand. It is a side view of the rotary cultivator concerning other embodiments.

Explanation of symbols

2 Machine frame 10 Connecting part (lower link pin)
11 Ground working section (rotary tillage section)
29 Support frame 34 Elevating operation device 44 Stand 45 Stand 48 Ground ring 52 Ground ring L Ground

Claims (3)

  A ground frame working part (11) is provided on the lower side of the machine frame (2) and a support frame (29) provided to extend rearward from the machine frame (2). The front portion is pivotally supported on the machine frame (2) so that the support frame (29) can swing up and down, and the support frame (29) is interposed between the support frame (29) and the machine frame (2). Is provided with at least three stands (44, 45) for grounding and supporting the machine frame (2). At least one of the stands (44, 45) is provided. Is placed on the front side of the ground work section (11) and attached to the machine frame (2), and the remaining stand (45) is placed on the rear side of the ground work section (11) and attached to the support frame (29). By lowering the support frame (29), the ground work unit (11) can be supported in a floating state from the ground (L). Working machine, characterized in that it is earthenware pots configuration.   The working machine according to claim 1, wherein a grounding wheel (48, 52) that is grounded and rollable is provided on a lower end side of each stand (44, 45).   Provided on the front side of the machine frame (2) is a connecting part (10) connected to the work implement mounting device provided on the tractor, and is arranged on the front side of the ground working part (11) using this connecting part (10). The working machine according to claim 1 or 2, wherein a stand (44) can be attached.

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