JP2017216888A - Agricultural machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agricultural machine that can perform appropriate leveling work.SOLUTION: An agricultural machine includes a tilling body 24 for performing tillage, and leveling means 25 for performing leveling work behind the tilling body 24. The leveling means 25 has a first leveling body 32 and a second leveling body 33. The leveling means 25 has a virtual four joint linkage mechanism 84 provided by connecting 4-turning fulcrums A, B, C and D. In the tilling leveling work, an angle in the horizontal direction of the second leveling body 33 is regulated by the virtual four joint linkage mechanism 84.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an agricultural machine that performs tillage leveling work.

  2. Description of the Related Art Conventionally, for example, a farm work machine such as a scraping work machine described in Patent Document 1 is known.

  This conventional farm work machine includes, for example, a machine body connected to a traveling vehicle such as a tractor, a cultivated body that is rotatably provided on the machine body and performs a cultivating work, and a leveling means that performs a leveling work behind the cultivated body. I have.

  And the leveling means has the 1st leveling body provided in the body so that rotation up and down was possible, and the 2nd leveling body provided in this 1st leveling body so that rotation up and down was possible. And the second leveling body freely rotates up and down for the tilling work. Moreover, although the up-and-down rotation of the 2nd leveling body may be attenuate | damped by the damper, the 2nd leveling body also has a structure which freely rotates up and down.

JP 2008-187940 A

  In the conventional farming machine, the second leveling body freely rotates up and down during the tilling work, so if the angle of the second leveling body with respect to the field changes depending on the field conditions and work speed, the field is not leveled, There are cases where proper leveling work cannot be performed.

  This invention is made | formed in view of such a point, and it aims at providing the agricultural machine which can perform suitable leveling work.

  The agricultural machine according to claim 1 includes a cultivating body that performs a tilling work, a ground leveling unit that includes a first leveling body and a second leveling body, and performs a leveling work behind the tilling body, It has a virtual four-bar link mechanism provided by connecting four pivots, and the angle with respect to the horizontal direction of the second leveling body is regulated by the virtual four-bar link mechanism during the tilling work.

  The agricultural working machine according to claim 2 includes a cultivating body that performs a plowing work, a leveling means that has a first leveling body and a second leveling body, and performs a leveling work behind the cultivating body, and the leveling means includes: It has a virtual four-bar link mechanism that is provided by connecting four rotation fulcrums, and the angle with respect to the horizontal direction of the second leveling body is constant by the virtual four-bar link mechanism during the tilling work. .

  The farm work machine according to claim 3 is a machine body, a farming body provided on the machine body for plowing work, and a first ground leveling provided on the machine body so as to be rotatable up and down around a first ground leveling body rotation fulcrum. And a leveling means having a second leveling body provided on the first leveling body so as to be rotatable up and down around the second leveling body rotation fulcrum and performing leveling work behind the tillage body. The leveling means has a virtual four-joint link mechanism provided by connecting four rotation fulcrums including the first leveling body rotation fulcrum and the second leveling body rotation fulcrum. The angle with respect to the horizontal direction of the said 2nd leveling body is constant irrespective of the vertical rotation of the said 1st leveling body by the virtual four-bar linkage mechanism.

  The farm work machine according to claim 4 is the farm work machine according to claim 3, wherein the virtual four-bar linkage mechanism has a constant angle with respect to a horizontal direction of the second leveling body regardless of the vertical rotation of the first leveling body. There is a selection means for selecting a constant angle state, and an angle variable state in which the angle of the second leveling body with respect to the horizontal direction varies according to the vertical rotation of the first leveling body.

  The agricultural machine according to claim 5 is the agricultural machine according to any one of claims 1 to 4, wherein the virtual four-bar linkage mechanism sets an angle with respect to a horizontal direction of the second leveling body during the tilling work. It has an angle setting means.

  The agricultural machine according to claim 6 is the agricultural machine according to any one of claims 1 to 5, wherein the position of the second leveling body is set to the leveling position at the time of the tilling leveling work via the virtual four-bar linkage mechanism. Switching means for switching to the earthing position at the time of earthing work is provided.

  The agricultural implement according to claim 7 is the agricultural implement according to claim 6, wherein the virtual four-bar linkage mechanism is configured such that the first leveling body and the second leveling body are in a state where the second leveling body is in the earthing position. It has a control means which controls rotation to the back of a leveling body.

  According to the present invention, the angle with respect to the horizontal direction of the 2nd leveling body is constant at the time of tillage leveling work, and appropriate leveling work can be performed.

It is a rear view of the agricultural working machine which concerns on one embodiment of this invention. It is a perspective view of an agricultural working machine same as the above. It is a schematic sectional drawing in which the 2nd leveling body of a farm working machine same as the above exists in a leveling position. It is a schematic sectional drawing at the time of the cultivation leveling work which the 2nd leveling body in the leveling position of an agricultural working machine same as the above rotated up. It is the schematic sectional drawing which the 2nd leveling body of the agricultural working machine same as the above switched to the earthing position. It is a schematic sectional drawing at the time of the earthing | working work in which the 2nd leveling body in the earthing position of an agricultural working machine same as the above became the locked state. It is a fragmentary perspective view of an agricultural working machine same as the above. It is a fragmentary sectional view of an agricultural working machine same as the above. It is the schematic sectional drawing which set largely the angle in the leveling position of the 2nd leveling body of an agricultural working machine same as the above. It is the schematic sectional drawing which set small the angle in the leveling position of the 2nd leveling body of an agricultural working machine same as the above. The angle variable state in which the horizontal angle of the second leveling body is variable in accordance with the up-and-down rotation of the first leveling body of the agricultural working machine is shown. (A) is a schematic cross-section of the second leveling body in the leveling position. FIG. 4B is a schematic cross-sectional view showing a state where the second leveling body is at the leveling position and is rotated upward during the tilling work and the angle of the second leveling body is reduced. The angle variable state in which the horizontal angle of the second leveling body is variable in accordance with the up-and-down rotation of the first leveling body of the agricultural working machine is shown. (A) is a schematic cross-section of the second leveling body in the leveling position. FIG. 4B is a schematic cross-sectional view showing a state in which the second leveling body is at the leveling position and is rotated upward during the tilling work and the angle of the second leveling body is increased. It is a schematic sectional drawing which shows the agricultural working machine which concerns on other embodiment of this invention, and has a 2nd leveling body in a leveling position. It is a schematic sectional drawing at the time of the cultivation leveling work which the 2nd leveling body in the leveling position of an agricultural working machine same as the above rotated up. It is the schematic sectional drawing which the 2nd leveling body of the agricultural working machine same as the above switched to the earthing position. It is a partial side view of the switching means which switches a 2nd leveling body same as the above to a earthing position. It is a partial side view of the state which operated the switching means same as the above.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 and 2, reference numeral 1 denotes an agricultural machine. The agricultural machine 1 is connected to a rear portion of a tractor (not shown), which is a traveling vehicle, for example, and the farm field (paddy field, field, etc.) is moved forward by the tractor traveling. It is a scraping work machine that performs a scraping work or a soiling work that is a tilling work while moving in a certain traveling direction F.

  The farm work machine 1 includes a center work part 2 having a longitudinal left and right direction connected to a three-point link part (a farm work machine lifting support device) at the rear of a tractor (not shown), and both left and right end parts of the center work part 2 The left and right extension work sections 3 are provided so as to be rotatable about the folding shaft 5 in the front-rear direction, and the left and right extension work sections 3 are respectively centered on the folding shaft 5 with respect to the central work section 2. And a cylinder portion 4 which is a rotation drive means for rotation.

  The left and right extension work units 3 are in a deployment work state located on the side of the central work unit 2 by rotating in the deployment direction around the folding shaft 5, and are folded in the folding direction around the folding shaft 5. The folding operation is located above the central working unit 2 by turning to the right.

  Such a foldable three-divided farm work machine 1 has a working state by the central working part 2 and the left and right extension working parts 3 and a work by the central working part 2 and the left and right extension working parts 3 only. It is possible to selectively switch between a state and a working state by only the central working unit 2.

  The central working unit 2 includes a machine body 9 that is detachably connected to the three-point link part at the rear of the tractor, and a tilling work while rotating in a predetermined direction with power from the tractor provided rotatably on the machine body 9. And a leveling means 10 provided at the rear end of the machine body 9 for leveling work behind the tillage body.

  The airframe 9 includes a top mast 11 and left and right lower links (not shown) that are detachably connected to the three-point link portion at the rear of the tractor.

  Further, the machine body 9 has a frame pipe 12 that is longitudinal in the left-right direction and a tillage cover 13 that covers the top of the tillage body. A mission case 14 is provided at the center in the left-right direction of the frame pipe 12. A rotating shaft (not shown) is rotatably disposed in the frame pipe 12. The transmission case 14 is provided with an input shaft (not shown) for inputting power from the PTO shaft side of the tractor and a gear transmission mechanism (not shown) for transmitting power from the input shaft to the rotating shaft. . A chain case 15 is provided at the left end of the frame pipe 12, and a bracket 16 is provided at the right end of the frame pipe 12. In the chain case 15, a chain transmission mechanism (not shown) for transmitting power from the rotary shaft to the tiller is provided.

  The tilled body is rotatably provided between the chain case 15 and the bracket 16 of the body 9. This cultivator has a cultivating shaft that rotates in a predetermined direction by power transmitted from the input shaft side, and a plurality of cultivating claws that are attached to the cultivating shaft and perform a cultivating operation while rotating in a predetermined direction. The configuration of the cultivated body is the same as the configuration of the cultivated body 24 described in the extension work unit 3.

  The leveling means 10 includes a first leveling body (level plate) 17 which is provided at the lower end (rear end) of the tillage cover 13 of the machine body 9 so as to be vertically rotatable, and a lower end (rear side) of the first leveling body 17. A second leveling body (rake) 18 is provided at the end) so as to be rotatable up and down, and a support means 19 is rotatably connected to the second leveling body 18.

  In addition, the extension work unit 3 is provided at the left and right ends of the machine body 9 of the central work unit 2 so as to be pivotable in the vertical direction about the folding shaft 5, and is provided rotatably on the machine body 23. And a cultivating body 24 that performs a cultivating operation while rotating in a predetermined direction with power from the tractor side, and a leveling means 25 that is provided at the rear end portion of the machine body 23 and performs a grading operation behind the cultivating body 24. .

  The machine body 23 has a frame pipe 26 that is positioned coaxially with the frame pipe 12 of the central work unit 2 when the extension work unit 3 is in the unfolding work state, and a tillage cover 27 that covers the top of the tillage body 24. A rotating shaft (not shown) that is detachably connected to the rotating shaft in the frame pipe 12 and that transmits power from the rotating shaft in the frame pipe 12 is rotatably disposed in the frame pipe 26. Yes. A chain case 28 is provided at the outer end of the frame pipe 26, and a bracket 29 is provided at the inner end of the frame pipe 26. A chain transmission mechanism (not shown) that transmits power from the rotary shaft to the tillage body 24 is provided in the chain case 28.

  The tillage body 24 is rotatably provided between the chain case 28 and the bracket 29 of the machine body 23. The cultivator 24 has a cultivating shaft 30 that rotates in a predetermined direction by the power transmitted from the input shaft side, and a plurality of cultivating claws 31 that are attached to the cultivating shaft 30 and perform the culturing work while rotating in the predetermined direction. doing.

  The leveling means 25 includes a first leveling body (level plate) 32 that is rotatably provided at the lower end (rear end) of the tillage cover 27 of the machine body 23, and a lower end (rear) of the first leveling body 32. A second leveling body (rake) 33 provided at the end) so as to be rotatable up and down, an extended leveling body (extended rake) 34 connected to an outer end of the second leveling body 33, and a second leveling body And support means 35 for supporting 33.

  The extended leveling body 34 can be rotated between an unfolding work state (open state) located on the side of the extension work unit 3 and a folding non-working state (closed state) located above the second leveling body 33. Then, the opening / closing device 36 attached to the upper part of the tillage cover 27 is switched between the unfolding working state and the folding non-working state.

  When the extension working part 3 is in the unfolding work state, the rotating shaft in the frame pipe 26 is connected to the rotating shaft in the frame pipe 12 of the central working part 2, thereby transmitting the power from the input shaft to the tillage body 24. In addition, the inner end of the second leveling body 33 is connected to the outer end of the second leveling body 18 of the central working unit 2, whereby the first leveling bodies 17 and 32 of the respective working units 2 and 3 are connected. Can be integrally rotated up and down, and the second leveling bodies 18 and 33 of the respective working units 2 and 3 can be integrally rotated up and down.

  Next, the configuration of the extension working unit 3 will be described with reference to FIGS.

  The first leveling body 32 is formed in a left-right direction longitudinal shape, and has side plates 40 on both left and right sides thereof. The upper end portion (front end portion) of the first leveling body 32, that is, the upper end portion (front end portion) of the side plates 40, the tilling cover 27 of the body 23 around the axis 42 in the left-right direction that is the first leveling body rotation fulcrum 41. It is attached to the rear part so that it can turn up and down.

  The second leveling body 33 is formed in a longitudinal shape in the left-right direction, and has side plates 44 on both left and right sides thereof. The upper end portion (front end portion) of the second leveling body 33, that is, the upper end portion (front end portion) of the both side plates 44, the second leveling body turning fulcrum 45, and the left and right axis 46 is the center of the first leveling body 32. The lower end portion (rear end portion), that is, the lower end portion (rear end portion) of each side plate 40 is attached so as to be vertically rotatable.

  A pair of left and right connecting plates 47 project from the center of the rear surface (upper surface) of the second leveling body 33 in the left-right direction. At the upper end side of these connection plates 47, a central first connection hole 48, a second connection hole 49 positioned farther from the second leveling body rotation fulcrum 45 than the first connection hole 48, A third connection hole 50 located closer to the second leveling body rotation fulcrum 45 than the one connection hole 48 is provided.

  The support means 35 includes a link fulcrum plate 53 provided on the machine body 23, a switching arm 54 provided on the link fulcrum plate 53 so as to be able to rotate back and forth, and the switching arm 54 and the second leveling body 33. The connecting link 55 to be connected and the switching arm 54 are rotated back and forth so that the position of the switching arm 54, that is, the position of the second leveling body 33 is adjusted to the leveling position (position shown in FIGS. 3 and 4) and soil during the tilling work. There is provided switching means 56 for switching to the earthing position (position shown in FIGS. 5 and 6) during the drawing work.

  The link fulcrum plates 53 are a pair of left and right (see FIG. 7), and project from a fulcrum reinforcing plate 58 attached to the body 23, that is, the tillage cover 27. The link fulcrum plate 53 is provided with a left and right switching support pin 59 that rotatably supports the switching arm 54. Further, the link fulcrum plate 53 has a first restriction hole 60 provided on the rear end side of the link fulcrum plate 53 and a second restriction hole 61 provided on the front end side of the link fulcrum plate 53. In the first restriction hole 60 and the second restriction hole 61, a restriction pin 62 for adjusting the position of the switching arm 54 at the time of tillage work can be selectively attached.

  The switching arm 54 is disposed between the pair of left and right link fulcrum plates 53 so as to be able to rotate back and forth around the switching support pin 59. The switching arm 54 has a switching arm portion 64 on one side and a switching arm portion 65 on the other side. The lower end sides of these switching arm portions 64 and 65 are fixed to the pipe portion 66, and the switching arm on the other side. The upper end side of the portion 65 is bent and fixed to the upper end side of the switching arm portion 65 on one side. A switching support pin 59 is rotatably inserted into the pipe portion 66, and the switching arm 54 is rotatable back and forth around the pipe portion 66, that is, the switching support pin 59. The switching arm 54 is rotated by the switching means 56 to the front leveling switching position during the tilling work, and to the rear earthing switching position during the earthing work.

  A connecting link 55 is rotatably connected to the rear end side of the switching arm 54 around a link fulcrum pin 67 in the left-right direction. A connecting hole 68 connected to the switching means 56 is formed on the front end side of the switching arm portion 64 on one side.

  The switching arm 54 is provided with a restriction hole 69 corresponding to the position of the first restriction hole 60 of the link fulcrum plate 53. When the restriction pin 62 is inserted into the first restriction hole 60, the restriction pin 62 is inserted into the restriction hole 69. The restriction hole 69 is formed in the shape of a long hole with a circular arc centering on the pipe portion 66, that is, the switching support pin 59, and the leveling switching position and the earthing switching position of the switching arm 54 with the restriction pin 62 inserted. It is possible to rotate between the two. When the switching arm 54 rotates to the leveling switching position, the rear end edge of the restriction hole 69 abuts on the regulation pin 62, whereby the switching arm 54 is regulated to a predetermined leveling switching position.

  At the front end of the switching arm portion 64 on one side, when the restriction pin 62 is inserted into the second restriction hole 61 of the link fulcrum plate 53 when the switching arm 54 is rotated to the leveling switching position, the restriction pin 62 is inserted. To the predetermined ground level switching position, and when the regulation pin 62 is not used, it contacts the fulcrum reinforcing plate 58 to limit the switching arm 54 to the predetermined level level switching position. A regulation abutting portion 71 is provided. In addition, at the lower rear side of the switching arm portion 64, when the switching arm 54 is rotated to the earthing switching position, the earthing which contacts the fulcrum reinforcing plate 58 and restricts the switching arm 54 to the predetermined earthing switching position. A contact portion 72 is provided.

  The connecting link 55 has a substantially U-shaped cross section, and its upper end is rotatably connected to the switching arm 54 around the link fulcrum pin 67, and its lower end is centered on the connecting pin 74 in the left-right direction. The second leveling body 33 is rotatably connected. The connection pin 74 is inserted into any one of the connection holes 48, 49, 50 provided in the connection plate 47 of the second leveling body 33, and connects the lower end portion of the connection link 55 and the second leveling body 33. It is connected so that it can rotate.

  Further, the switching means 56 includes a rod 76 that is rotatably connected to the switching arm 54, and an actuator 77 that rotates the switching arm 54 back and forth via the rod 76.

  The rod 76 has a rear end portion connected to a connection hole 68 of the switching arm 54 so as to be rotatable by a shaft 78.

  The actuator 77 is, for example, a motor or a cylinder, and is installed on the top of the tillage cover 27 of the body 23. A pivot arm 79 is provided on the side of the actuator 77 so as to pivot in the front-rear direction by the actuator 77, and a support member 80 is attached to the pivot arm 79 to support the front end side of the rod 76 so as to be movable in the axial direction. ing.

  Around the rod 76, a spring 81 is mounted between the rear end side of the rod 76 and the support member 80, and a spring 82 is mounted between the front end side of the rod 76 and the support member 80. .

  The switching means 56 can be switched between a leveling switching position at the time of tillage leveling work in which the switching arm 54 is rotated forward and a earthing switching position at the time of earthing work in which the switching arm 54 is rotated rearward. And

  The first leveling body 32, the second leveling body 33, the switching arm 54, and the connection link 55 constitute a virtual four-bar linkage mechanism 84. The virtual four-bar link mechanism 84 includes a rotation fulcrum A that is a first leveling body rotation fulcrum 41, a rotation fulcrum B that is a link fulcrum pin 67, and a rotation fulcrum that is a second leveling body rotation fulcrum 45. C and a rotation fulcrum D that is a connecting pin 74, and these four rotation fulcrums A, B, C, and D are connected. In the figure, a virtual link connecting the rotation fulcrums A, B, C, and D is shown by a one-dot chain line.

  The virtual four-bar linkage mechanism 84 in the state shown in FIG. 3 has a distance between the rotation fulcrums A and B = a distance between the rotation fulcrums C and D, a distance between the rotation fulcrums A and C = a rotation fulcrum B, There is a relationship of distance between C, and a parallel link mechanism is configured. Therefore, even if the first leveling body 32 rotates up and down around the rotation fulcrum A, the angle θ1 of the second leveling body 33 with respect to the horizontal direction is kept constant. The angle θ1 of the second leveling body 33 with respect to the horizontal direction is preferably 20 °, but is preferably in the range of 0 ° to 30 ° in consideration of the field conditions and work speed.

  Further, the virtual four-bar link mechanism 84 includes an angle setting means 85 provided at a connection portion between the link fulcrum plate 53 and the switching arm 54, a selection means 86 provided at a connection portion between the second leveling body 33 and the connection link 55, In addition, there is a restricting means (lock means) 87 provided between the first leveling body 32 and the switching arm 54 (link fulcrum pin 67).

  In the angle setting means 85, the angle with respect to the horizontal direction of the 2nd leveling body 33 at the time of tilling work is switched. That is, in the angle setting means 85, the restriction pin 62 is inserted into the first restriction hole 60 of the link fulcrum plate 53, inserted into the second restriction hole 61, the first restriction hole 60 and the second restriction hole. By being not inserted into any of 61, the angle with respect to the horizontal direction of the second leveling body 33 during the tilling work is switched.

  In the selection means 86, the second leveling body 33 is in a constant angle state where the angle with respect to the horizontal direction is constant regardless of the vertical rotation of the first leveling body 32, and the first leveling body 32 according to the vertical rotation of the first leveling body 32. An angle variable state in which the angle of the leveling body 33 with respect to the horizontal direction can be selected is selectable. That is, in the selection means 86, the connecting pin 74 is inserted into the first connecting hole 48 to select a constant angle state, and the connecting pin 74 is inserted into either the second connecting hole 49 or the third connecting hole 50. Thus, the variable angle state is selected.

  The regulating means 87 regulates the rearward rotation of the first leveling body 32 and the second leveling body 33 in a state where the second leveling body 33 is in the earthing position. The regulating means 87 has a regulating member 88 provided on the rear surface of the first leveling body 32, and the regulating member 88 abuts on the link fulcrum pin 67 and is behind the first leveling body 32 and the second leveling body 33. The first leveling body 32 and the second leveling body 33 are locked at a predetermined earthing position.

  Next, the operation and the like of the farm work machine 1 will be described.

  The farm work machine 1 is connected to the three-point link part at the rear of the tractor. Also, for example, as shown in FIG. 2, when expanding the work width of the farm machine 1 and performing the tilling work (scraping work), the left and right extension work parts 3 are set in the unfolding work state to the side of the central work part 2, Furthermore, the left and right extended leveling bodies 34 are set in a deployed work state to the side of the extension work unit 3 as necessary.

  When the left and right extension work sections 3 are in the unfolded work state, the inner end of the second leveling body 33 of the extension work section 3 is connected to the outer end of the second leveling body 18 of the central work section 2. As a result, the first leveling bodies 17 and 32 of the working units 2 and 3 are integrally rotated up and down, and the second leveling bodies 18 and 33 of the work units 2 and 3 are integrally rotated up and down. It becomes like this.

  First, the tilling work (pavement work) by the agricultural machine 1 will be described. In addition, about the tilling level work demonstrated below, the tilling level work in the extension work part 3 shall be demonstrated with reference to drawings, such as FIG. 3 and FIG. However, the same tilling work is performed in the central working unit 2 simultaneously with the extension working unit 3.

  As shown in FIGS. 3 and 4, in the tilling work, the switching arm 54 is rotated to the front leveling switching position by the actuator 77, the connecting link 55 is pulled up, and the second leveling body 33 is positioned at the leveling position. ing. In the state shown in FIGS. 3 and 4, the connecting pin 74 of the selecting means 86 is inserted into the first connecting hole 48 of the connecting plate 47 of the second leveling body 33, so that the virtual four-bar link mechanism 84 is rotated. The distance between the fulcrums A and B = the distance between the rotation fulcrums C and D, and the distance between the rotation fulcrums A and C = the distance between the rotation fulcrums B and D, which constitutes a parallel link mechanism. . Further, the restriction pin 62 of the angle setting means 85 is inserted into the first restriction hole 60 of the link fulcrum plate 53, and the switching arm 54 is at the leveling switching position where the rear end edge of the restriction hole 69 is in contact with the restriction pin 62. The angle of the second leveling body 33 with respect to the horizontal direction is a predetermined angle θ1 corresponding to the leveling switching position of the switching arm 54.

  Then, when the agricultural implement 1 is moved in the traveling direction F by the traveling of the tractor, the cultivating body 24 cultivates the soil in the field while rotating in a predetermined rotation direction. The soil of the field where the body 32 and the second leveling body 33 are cultivated is leveled to flatten the field scene.

  FIG. 3 shows a state in which the first leveling body 32 and the second leveling body 33 are rotated downward when the tilling work is not performed. FIG. 4 shows a state in which the lower side of the cultivating body 24 sinks into the field during the plowing work, and the first leveling body 32 and the second leveling body 33 that level the field scene rotate upward.

  During the plowing work, the first leveling body 32 and the second leveling body 33 that level the field scene rotate upward, and the amount of upward rotation changes or moves up and down depending on the state of the field. By the virtual four-bar linkage mechanism 84, the angle θ1 with respect to the horizontal direction of the second leveling body 33 is kept constant regardless of the vertical rotation of the first leveling body 32.

  By the way, if the second leveling body 33 can freely rotate up and down, the angle of the second leveling body 33 with respect to the field changes depending on the field conditions and the work speed of the farm work machine 1, and the field is not leveled. There is a case.

  On the other hand, the angle of the second leveling body 33 with respect to the horizontal direction is maintained at an appropriate constant angle θ1, so that the field can be leveled regardless of the field conditions and the work speed of the farm work machine 1.

  Next, earthing work by the agricultural machine 1 will be described. In addition, about the earthing work demonstrated below, the earthing work in the extension work part 3 shall be demonstrated with reference to drawings, such as FIG.5 and FIG.6. However, a similar earthing operation is performed in the central working unit 2 simultaneously with the extension working unit 3.

  As shown in FIGS. 5 and 6, in the earthing operation, the switching arm 54 is rotated to the rear earthing switching position by the actuator 77, the connecting link 55 is pushed down, and the second leveling body 33 is moved from the leveling position. It is located at the earthing position where it stands up in the vertical direction. The switching arm 54 is held at the earthing switching position where the earthing contact part 72 contacts the fulcrum reinforcement plate 58. When the switching arm 54 rotates to the earthing switching position, the virtual four-bar link mechanism 84 has a relationship of the distance between the rotation fulcrums A and B <the distance between the rotation fulcrums C and D, and constitutes a parallel link mechanism. Disappear.

  And if the agricultural implement 1 is moved to the advancing direction F by driving | running | working of a tractor, the soil of an agricultural field will be pulled with the 2nd leveling body 33, and an agricultural scene will be leveled.

  FIG. 5 shows a state in which the second leveling body 33 is rotated to the earthing position. FIG. 6 shows a state where the second leveling body 33 is pushed backward by the soil in the field during the earthing work. When the second leveling body 33 is pushed rearward, the second leveling body 33 tries to rotate backward together with the first leveling body 32, but the regulating member 88 provided on the first leveling body 32 is connected to the link fulcrum pin. Abutting on 67, the rearward rotation of the first leveling body 32 and the second leveling body 33 is restricted and the locked state is established, so that the earthing work is reliably performed.

  Next, setting of the angle with respect to the horizontal direction of the second leveling body 33 by the angle setting means 85 in the tilling work will be described.

  3 and 4 show a state in which the restriction pin 62 of the angle setting means 85 is inserted into the first restriction hole 60 of the link fulcrum plate 53. FIG. In this state, when the switching arm 54 is rotated forward, the switching arm 54 becomes the leveling switching position where the rear end edge of the restriction hole 69 is in contact with the restriction pin 62. Depending on the leveling switching position of the switching arm 54, the angle of the second leveling body 33 with respect to the horizontal direction is a predetermined angle θ1.

  FIG. 9 shows a state in which the restriction pin 62 of the angle setting means 85 is inserted through the second restriction hole 61 of the link fulcrum plate 53. In this state, when the switching arm 54 is rotated forward, the regulation groove 70 of the switching arm 54 becomes the leveling switching position where it abuts against the regulation pin 62. The switching arm 54 at the leveling switching position has a smaller forward rotation angle than when the restriction pin 62 is inserted through the first restriction hole 60. Depending on the leveling switching position of the switching arm 54, the angle of the second leveling body 33 with respect to the horizontal direction becomes an angle θ2 larger than the angle θ1. In FIG. 9, the position of the second leveling body 33 in the case of the angle θ1 is indicated by a two-dot chain line.

  In FIG. 10, the restriction pin 62 of the angle setting means 85 is not inserted into either the first restriction hole 60 or the second restriction hole 61, and the restriction pin 62 is not used. In this state, when the switching arm 54 is rotated forward, the regulation contact portion 71 of the switching arm 54 becomes the leveling switching position where the switching arm 54 contacts the fulcrum reinforcement plate 58. The switching arm 54 at the leveling switching position has a greater forward rotation angle than when the restriction pin 62 is inserted through the first restriction hole 60. Depending on the leveling switching position of the switching arm 54, the angle of the second leveling body 33 with respect to the horizontal direction is an angle θ3 smaller than the angle θ1. In FIG. 10, the position of the second leveling body 33 in the case of the angle θ1 is indicated by a two-dot chain line.

  And since the angle with respect to the horizontal direction of the 2nd leveling body 33 can be appropriately set by the angle setting means 85 according to the field conditions, the work speed of the agricultural machine 1, etc., the field can be leveled evenly.

  Next, according to the angle constant state where the angle with respect to the horizontal direction of the second leveling body 33 is constant regardless of the vertical rotation of the first leveling body 32 by the selection means 86 and the vertical leveling of the first leveling body 32. The selection of the angle variable state in which the angle of the second leveling body 33 with respect to the horizontal direction is variable will be described.

  3 and 4 show a state in which the connecting pin 74 of the selecting means 86 is inserted into the first connecting hole 48 of the connecting plate 47 of the second leveling body 33. In this state, the virtual four-bar link mechanism 84 has a distance between the rotation fulcrums A and B = a distance between the rotation fulcrums C and D, and a distance between the rotation fulcrums A and C = between the rotation fulcrums B and D. They are in a distance relationship and constitute a parallel link mechanism.

  Therefore, irrespective of the first leveling body 32 rotating up and down, the angle of the second leveling body 33 with respect to the horizontal direction is kept at a constant angle θ1.

  11A and 11B show a state in which the connecting pin 74 of the selecting means 86 is inserted into the second connecting hole 49 of the connecting plate 47 of the second leveling body 33. FIG. In this state, the virtual four-bar linkage mechanism 84 has a relationship of the distance between the rotation fulcrums A and B <the distance between the rotation fulcrums C and D, and does not constitute a parallel link mechanism.

  Therefore, the angle of the second leveling body 33 with respect to the horizontal direction is the angle θ4 when the second leveling body 33 is rotated downward, and the angle θ5 when the second leveling body 33 is rotated upward, and the angle θ4> The relationship is the angle θ5. That is, the angle of the second leveling body 33 with respect to the horizontal direction changes so as to decrease as the second leveling body 33 rotates upward.

  12A and 12B show a state in which the connecting pin 74 of the selecting means 86 is inserted into the third connecting hole 50 of the connecting plate 47 of the second leveling body 33. FIG. In this state, the virtual four-bar linkage mechanism 84 has a relationship of the distance between the rotation fulcrums A and B> the distance between the rotation fulcrums C and D, and does not constitute a parallel link mechanism.

  Therefore, the angle of the second leveling body 33 with respect to the horizontal direction is the angle θ6 when the second leveling body 33 is rotated downward, and the angle θ7 when the second leveling body 33 is rotated upward, and the angle θ6 < The relationship is the angle θ7. That is, the angle of the second leveling body 33 with respect to the horizontal direction changes so as to increase as the second leveling body 33 rotates upward.

  Then, according to the field conditions, the work speed of the agricultural machine 1, etc., the selection means 86 makes the angle constant state in which the angle with respect to the horizontal direction of the second leveling body 33 is constant regardless of the vertical rotation of the first leveling body 32. Since the angle variable state in which the angle with respect to the horizontal direction of the second leveling body 33 is variable according to the vertical rotation of the first leveling body 32 can be appropriately switched and set, the field can be leveled evenly.

  And according to the agricultural implement 1 comprised as mentioned above, since the angle with respect to the horizontal direction of the 2nd leveling body 33 can be kept constant by the virtual four-bar linkage mechanism 84 at the time of tillage leveling work, Regardless of the work speed of the agricultural machine 1, appropriate leveling work can be performed, such as leveling the field.

  The virtual four-bar linkage mechanism 84 includes four rotation fulcrums A, B, including a first leveling body rotation fulcrum 41 of the first leveling body 32 and a second leveling body rotation fulcrum 45 of the second leveling body 33. Since C and D are connected, the virtual four-bar linkage mechanism 84 can be easily configured.

  Further, the angle setting means 85 provided in the virtual four-bar linkage mechanism 84 appropriately switches the angle of the second leveling body 33 with respect to the horizontal direction in accordance with the field conditions during the plowing and leveling work, the work speed of the agricultural work machine 1, and the like. Since it can be set, appropriate leveling work can be performed.

  Further, the selection means 86 provided in the virtual four-bar linkage mechanism 84 allows the second leveling body regardless of the vertical rotation of the first leveling body 32 in accordance with the field conditions during the tillage leveling work, the work speed of the agricultural work machine 1, or the like. An angle constant state in which the angle of 33 with respect to the horizontal direction is constant and an angle variable state in which the angle with respect to the horizontal direction of the second leveling body 33 is variable according to the vertical rotation of the first leveling body 32 are appropriately selected. Since it can be set, appropriate leveling work can be performed.

  Further, the switching means 56 can switch the position of the second leveling body 33 between the leveling position during the tilling work and the earthing position during the earthing work via the virtual four-bar linkage mechanism 84. Can be simplified.

  Further, in order to restrict the backward rotation of the first leveling body 32 and the second leveling body 33 in a state where the second leveling body 33 is in the earthing position by the restriction means 87 provided in the virtual four-bar linkage mechanism 84. The earthing work can be ensured.

  Next, FIG. 13 thru | or FIG. 17 shows the agricultural working machine 1 of other embodiment.

  The switching means 56 may be configured to use a switching lever 91 and manually switch the position of the second leveling body 33 between the leveling position and the earthing position by the switching lever 91.

  In this configuration, the connecting link 55 is attached to the link fulcrum plate 53 so as to be rotatable around the link fulcrum pin 67 in the left and right direction, and the switching lever 91 is rotatable around the lever support pin 92 in the left and right direction. It is attached.

  In the link fulcrum plate 53, a switching groove 93 into which the link fulcrum pin 67 is inserted is formed. The switching groove 93 is long along the front-rear direction, and for example, an arc-shaped leveling switching groove 94 centered on the first leveling body rotation fulcrum 41 (rotation fulcrum A) is formed on the front side, and the rear side Is formed with a earthing changeover groove part 95 that extends obliquely upward from the rear end of the leveling changeover groove part 94. Further, a lever support pin 92 is inserted into the link fulcrum plate 53 above the switching groove 93, and the rear and front portions on the same circumference around the lever support pin 92 and above the lever support pin 92 are arranged. Are provided with leveling switching holes 96 and earthing switching holes 97, respectively.

  The switching lever 91 is provided in an elongated plate shape, and an intermediate portion is attached to the link fulcrum plate 53 so as to be rotatable about the lever support pin 92. A long slot 98 is formed in the lower end side of the switching lever 91 along the longitudinal direction of the switching lever 91, and a link fulcrum pin 67 is inserted into the slot 98.

  At the upper end side of the switching lever 91, both upper and lower end portions of a trigger 99 formed in a substantially U-shape are inserted so as to be movable in the left-right direction from one side of the switching lever 91. Between the both end portions of the trigger 99 and one side of the switching lever 91, springs 100 for urging the trigger 99 in a direction away from one side of the switching lever 91 are mounted. On the other side of the switching lever 91, a switching member 101 is attached to the lower end of the trigger 99 inserted through the other side of the switching lever 91. A switching pin 102 is provided at the lower end of the switching member 101. The switching pin 102 is disposed in an insertion hole 103 provided in the switching lever 91 so as to be movable in the left-right direction, and can be projected and retracted from one side of the switching lever 91. The leveling switching hole 96 or the earthing switching hole of the link fulcrum plate 53 Inserted into one of 97.

  Further, the restricting means (locking means) 87 may be provided between the first leveling body 32 and the second leveling body 33.

  In this configuration, the lock member 105 is attached to the front end portion of the second leveling body 33, and the lock surface 106 of the lock member 105 and the first leveling body 32 when the second leveling body 33 rotates to the earthing position. The lock surfaces 107 are in contact with each other.

  When plowing leveling work (plowing work) is performed, as shown in FIG. 13, the switching pin 102 of the switching lever 91 is engaged with the leveling switching hole 96, and the switching lever 91 is held at the leveling switching position. In this state, since the link fulcrum pin 67 is disposed on the front end side of the leveling switching groove portion 94 of the switching groove 93 by the switching lever 91, the second leveling body 33 is in the leveling position, and the virtual four-bar linkage mechanism 84, the distance between the rotation fulcrums A and B = the distance between the rotation fulcrums C and D, the distance between the rotation fulcrums A and C = the distance between the rotation fulcrums B and D, and the parallel link mechanism. Is configured. And the angle with respect to the horizontal direction of the 2nd leveling body 33 exists in predetermined | prescribed angle (theta) 8.

  As shown in FIG. 14, at the time of tillage leveling, the first leveling body 32 and the second leveling body 33 that level the field scene rotate upward, and the amount of upward rotation changes or moves up and down depending on the state of the field. However, by the virtual four-bar linkage mechanism 84 constituting the parallel link mechanism, the angle θ8 with respect to the horizontal direction of the second leveling body 33 is kept constant regardless of the first leveling body 32 rotating up and down.

  When the second leveling body 33 is switched from the leveling position to the earthing position, as shown in FIGS. 16 and 17, first, the trigger 99 is held together with the switching lever 91, and the trigger 99 is attached with the spring 100. By pushing against the force toward the switching lever 91, the switching pin 102 is removed from the leveling switching hole 96 of the link fulcrum plate 53 via the switching member 101. Next, as shown in FIG. 15, the link fulcrum pin 67 moves to the rear end side of the earthing switching groove portion 95 of the switching groove 93 by rotating the switching lever 91 forward. Subsequently, when the push of the trigger 99 is released, the switching pin 102 that moves together with the trigger 99 by the spring 100 protrudes from one side of the switching lever 91 and is inserted into the earthing switching hole 97 of the link fulcrum plate 53, and the switching lever 91 is held at the earthing switching position.

  Thereby, the 2nd leveling body 33 is rotated to the earthing position. When the second leveling body 33 is rotated to the earthing position, the lock surface 106 of the locking member 105 of the second leveling body 33 and the lock surface 107 of the first leveling body 32 come into contact with each other, and the second leveling body 33 Is locked in the earthing position.

  When the second leveling body 33 is switched from the earthing position to the leveling position, the trigger 99 is pushed in to remove the switching pin 102 from the earthing switching hole 97 of the link fulcrum plate 53, and the switching lever 91 is moved backward. The switching pin 102 may be inserted into the leveling switching hole 96 of the link fulcrum plate 53 by rotating.

  And also in the agricultural machine 1 comprised in this way, the effect similar to one Embodiment mentioned above is acquired.

  Further, the configuration can be simplified by adopting a manual switching structure for the switching means 56.

  The configuration for holding the switching lever 91 at the leveling switching position or the earthing switching position is not limited to the configuration using the switching holes 96 and 97 and the switching pin 102, and other holding structures may be used.

  Moreover, the agricultural machine 1 is not limited to the folding structure in which the extension working part 3 is provided in the central working part 2 so as to be foldable, but may be an integrated structure without the folding structure.

1 Agricultural machine
23 Airframe
24 Tillage
25 Leveling means
32 First leveling body
33 Second leveling body
41 First leveling body rotation fulcrum
45 Second leveling body rotation fulcrum
56 Switching means
84 Virtual four-bar linkage mechanism
85 Angle setting means
86 Selection methods
87 Regulating means A, B, C, D Rotating fulcrum

Claims (7)

A plowing body for plowing work,
A leveling means having a first leveling body and a second leveling body, and performing leveling work behind the tillage body,
The leveling means has a virtual four-joint link mechanism provided by connecting four rotation fulcrums,
An agricultural work machine characterized in that the angle with respect to the horizontal direction of the second leveling body is regulated by the virtual four-bar linkage mechanism at the time of tillage leveling. A plowing body for plowing work,
A leveling means having a first leveling body and a second leveling body, and performing leveling work behind the tillage body,
The leveling means has a virtual four-joint link mechanism provided by connecting four rotation fulcrums,
An agricultural working machine characterized in that the angle with respect to the horizontal direction of the second leveling body is constant by the virtual four-bar linkage mechanism during the plowing work. The aircraft,
A plowing body that is provided on this machine and performs plowing work;
A first leveling body provided on the machine body so as to be able to rotate up and down around a first leveling body rotation fulcrum, and a first leveling body provided at the first leveling body so as to be able to rotate up and down around a second leveling body rotation fulcrum. And a leveling means for performing leveling work behind the tillage body,
The leveling means has a virtual four-joint link mechanism provided by connecting four rotation fulcrums including the first leveling body rotation fulcrum and the second leveling body rotation fulcrum,
An agricultural working machine characterized in that the angle with respect to the horizontal direction of the second leveling body is constant regardless of the vertical rotation of the first leveling body by the virtual four-bar linkage mechanism during the tilling work. The virtual four-bar linkage mechanism responds to an angle constant state in which an angle with respect to a horizontal direction of the second leveling body is constant regardless of the vertical rotation of the first leveling body and a vertical rotation of the first leveling body. The agricultural working machine according to claim 3, further comprising selection means for selecting an angle variable state in which an angle of the second leveling body with respect to a horizontal direction is variable. The farm work machine according to any one of claims 1 to 4, wherein the virtual four-bar linkage mechanism includes angle setting means for setting an angle with respect to a horizontal direction of the second leveling body during the tillage leveling work. 2. A switching means for switching the position of the second leveling body between the leveling position during the tillage leveling work and the earthing position during the leveling work via the virtual four-bar linkage mechanism. Or the agricultural machine according to any one of 5; The virtual four-joint link mechanism has a restricting means for restricting the backward rotation of the first leveling body and the second leveling body in a state where the second leveling body is in the earthing position. The agricultural machine according to claim 6.

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