JP2015008655A - Farming machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a farming machine capable of reducing burden on an operator.SOLUTION: A farming machine 1 is equipped with a machine body 2 which is connected to a tractor. In the machine body 2, a movable body 3 is provided in a vertically movable manner. The movable body 3 is provided with a ground wheel 4 in a rotatable manner. In between the machine body 2 and the movable body 3, an expandable body 6 is installed. The farming machine 1 is equipped with a motor 7 which expands the expandable body 6 and a gas spring 8 which is energization means for assisting the expanding motion of the expandable body 6 by the motor 7.

Description

  The present invention relates to an agricultural machine that can reduce a burden on an operator.

  Conventionally, for example, an agricultural machine described in Patent Document 1 is known.

  This conventional farm work machine includes, for example, a work machine main body connected to the rear part of a traveling vehicle such as a tractor, an arm body provided at the front part of the work machine main body so as to be movable up and down, and having a handle part at an upper end part, A grounding ring provided at the lower end of the arm body.

JP 2001-269011 A (FIG. 1)

  However, in the conventional farm work machine described above, for example, when adjusting the height of the grounding wheel, it is necessary for the worker to move the arm body up and down together with the grounding wheel by holding the handle portion, which places a burden on the worker.

  This invention is made | formed in view of such a point, and it aims at providing the agricultural machine which can reduce the burden on an operator.

  The farm work machine according to claim 1 is a work machine main body, a movable body provided on the work machine main body so as to be movable up and down, a grounding body provided on the movable body, the work machine main body, and the movable body. And a driving means for extending / contracting the expansion / contraction body, and an urging means for assisting the extending operation of the expansion / contraction body by the driving means.

  The agricultural machine according to claim 2 is the agricultural machine according to claim 1, wherein the biasing means is a gas spring installed between the work machine main body and the movable body, and the gas spring includes the movable body. It is urged in the downward movement direction to assist the extension operation of the expansion / contraction body by the driving means.

  The agricultural machine according to claim 3 is the agricultural machine according to claim 1 or 2, wherein the urging force of the urging means is 50% to 100% of the weight of the working machine main body.

  The agricultural machine according to claim 4 is the agricultural machine according to any one of claims 1 to 3, wherein the stretchable body includes a female screw member and a male screw member screwed into the female screw member, and the female screw member. And when either one of the male screw members is rotated with respect to the other, the expansion and contraction body expands and contracts.

  A farm work machine according to claim 5 is the farm work machine according to any one of claims 1 to 4, comprising control means for controlling the drive means so that the work height position of the work machine main body is maintained constant. It is.

  According to the present invention, since the movable means can move up and down together with the grounding body by causing the driving means to expand and contract the elastic body, the burden on the operator can be reduced, and the urging means can extend the elastic body by the driving means. In order to assist the operation, for example, the work implement main body can be lifted while the grounding body is in contact with the field scene during work, and workability can be improved.

It is a side view of the agricultural working machine which concerns on the 1st Embodiment of this invention. It is a top view of an agricultural working machine same as the above. It is a partial side view of an agricultural working machine same as the above. It is a partial top view of an agricultural working machine same as the above. It is an enlarged view of the A section in FIG. It is operation | movement explanatory drawing of a farm work machine same as the above. It is operation | movement explanatory drawing of a farm work machine same as the above. It is a figure which shows the expansion-contraction body of an agricultural working machine same as the above, (a) is a case without a gas spring, (b) is a case with a gas spring. It is a side view of the agricultural working machine which concerns on the 2nd Embodiment of this invention. It is a top view of an agricultural working machine same as the above. It is a partial side view of an agricultural working machine same as the above. It is a partial top view of the agricultural machine concerning the 3rd Embodiment of this invention. It is a side view of the agricultural machine based on the 4th Embodiment of this invention.

  A first embodiment of the present invention will be described with reference to FIGS.

  In the figure, 1 is an agricultural machine, and this agricultural machine 1 is connected to the rear part of a tractor (not shown), which is a traveling vehicle, for example, while moving forward (traveling direction) on the field by forward traveling of the tractor, It is a flare mower that performs cutting work (chopping work) that is agricultural work.

  In other words, the farm work machine 1 cuts unnecessary leaves and leaves of a crop (not shown), for example, crops (eg, sweet potatoes and potatoes) vegetated on the straws a while moving on the field forward. .

  As shown in FIG. 1 and FIG. 2, the farm work machine 1 includes a work machine body 2 that is releasably connected to a three-point hitch part (work machine lifting support part) at the rear of the tractor and performs cutting work that is farm work. A movable body 3 provided at the rear of the work machine body 2 so as to be movable up and down, and a farm scene (a farm field between adjacent ridges a adjacent to each other) provided behind the tire of the tractor and provided at a lower portion of the movable body 3. A pair of left and right gauge wheels and a grounding wheel 4 that is a grounding body such as a tire.

  The movable body 3 is provided at the rear portion of the work machine main body 2 so as to be rotatable in the vertical direction around a horizontal rotation center axis X in the horizontal direction. That is, the movable body 3 is rotatable up and down (movable up and down) about the rotation center axis X with respect to the work machine main body 2.

  In addition, the farm work machine 1 is installed between the work machine body 2 and the movable body 3, and the movable body 3 is rotated downward (downward) about the rotation center axis X with respect to the work machine body 2 by an extension operation. And the movable body 3 is pivoted upward (moving upward) about the pivot center axis X with respect to the work machine main body 2 by a contraction operation, and is stretchable in the longitudinal direction, for example, one stretchable body 6 And a motor 7 which is a relatively small and inexpensive driving means for expanding and contracting the expandable body 6.

  Furthermore, the agricultural working machine 1 includes a gas spring 8 that is provided to urge the stretchable body 6 in the extending direction and assists the extending operation of the stretchable body 6 by the motor 7, for example, one urging means. . The gas spring 8 is elongated and can be expanded and contracted in the longitudinal direction, like the expansion / contraction body 6. The gas spring 8 is installed between the work machine body 2 and the movable body 3 in parallel with the expansion / contraction body 6. Is urged in the downward movement direction (direction in which the movable body 3 tends to move downward with respect to the work machine main body 2) to assist the extension operation of the telescopic body 6 by the motor 7. That is, the gas spring 8 constantly urges the expansion / contraction body 6 in the extending direction via the movable body 3, and expands / contracts in conjunction with the expansion / contraction body 6.

  The urging force of the gas spring 8 is, for example, 50% to 100% of the weight of the work machine body 2. The weight of the work machine body 2 is, for example, 100 kgf to 300 kgf.

  As shown in FIGS. 1 and 2, the work machine main body 2 has a machine body 11 that is releasably connected to a three-point hitch portion at the rear of the tractor, and is rotatably provided on the machine body 11 and rotates in a predetermined direction. While the cutting means 12 is a working unit for cutting the object to be cut in the field (for example, unnecessary stems and leaves of the crops), and two left and right guide bodies (dividers) 13 for guiding the object to be cut toward the cutting means 12; have.

  The airframe 11 has a three-point connecting portion 15 on the front side, and the three-point connecting portion 15 includes a top mast 17 connected to the upper link of the three-point hitch portion of the tractor via a top pin 16; The tractor is composed of two left and right lower arms 19 connected to lower links of the three-point hitch portion of the tractor via lower pins 18.

  The airframe 11 also has an input shaft support portion 20 at the center in the left-right direction on the front side, and the input shaft 21 is rotatably supported by the input shaft support portion 20. The input shaft 21 is connected to the PTO shaft of the tractor via a joint, and power output from the PTO shaft is input to the input shaft 21. The input shaft 21 is connected to power transmission means (not shown) that transmits the input power to the cutting means 12. The power transmission means includes, for example, a gear in the input shaft support portion 20, a transmission shaft in the frame pipe portion 22, a transmission belt in the transmission case portion 23, and the like.

  Further, the machine body 11 has a pair of left and right cover side plate portions 24 that are spaced apart from each other, and the left and right rotation shafts 25 of the cutting means 12 are rotatably supported by both the cover side plate portions 24. A claw body (not shown), which is a plurality of cutting blades that cut the workpiece while rotating integrally with the rotary shaft body 25, is attached to the rotary shaft body 25 of the cutting means 12. .

  The airframe 11 has a substantially curved plate-like cover portion 26 that covers the upper portion of the cutting means 12, and the upper end portion of the cover side plate portion 24 is fixed to both ends of the cover portion 26 in the left-right direction. A rubber cover 27, which is an elastically deformable elastic plate that covers the rear part of the cutting means 12, is attached to the rear end portion of the cover portion 26.

  As shown in FIGS. 1 to 3, the movable body 3 is a rotation fulcrum via a fixture (bolt, nut, etc.) 30 on the rear side of the cover side plate portion 24 of the machine body 11 of the work machine body 2. It has a pair of left and right rotating frames 31 that are attached so as to be rotatable in the vertical direction about the rotation center axis X.

  A connecting frame 32 that is elongated in the left-right direction is provided between the rotating frames 31, and the rear ends of the rotating frames 31 are integrally connected by the connecting frame 32.

  A plate-like attachment frame 33 is fixedly erected at the center in the longitudinal direction of the connection frame 32. And the lower end part (rear end part) of the expansion-contraction body 6 and the gas spring 8 is each attached to the upper part of the attachment frame 33 so that rotation is possible. On the other hand, the upper end portions (front end portions) of the telescopic body 6 and the gas spring 8 are rotatably attached to the upper portions of the attachment portions 10 of the machine body 11 of the work machine body 2.

  The mounting portion 10 of the machine body 11 is fixed to the rear surface of the input shaft support portion 20 of the machine body 11, and projects rearward and obliquely upward from the rear surface of the input shaft support portion 20. And in addition to the expansion-contraction body 6 and the gas spring 8, the motor 7 is attached to the upper part of the attachment part 10 of the body 11 so that rotation is possible. That is, the motor 7 is connected and fixed to the upper end portion of the expansion / contraction body 6, and rotates with respect to the attachment portion 10 of the body 11 together with the expansion / contraction body 6.

  Also, grounding wheel mounting frames 34 are attached to both the left and right sides, which are both ends in the longitudinal direction of the connection frame 32, so that the left and right positions can be adjusted. A grounding wheel 4 that moves while rotating while being in contact with the farm scene b is rotatably attached to the lower end portion of the grounding wheel mounting frame 34 via a support shaft 35 in the left-right direction.

  The movable body 3 includes a rotating frame 31, a connecting frame 32, a mounting frame 33, a grounding wheel mounting frame 34, and the like. The mounting frame 33 includes a pair of left and right mounting plates 33a having a substantially L-shaped cross section that are spaced apart from each other.

  The expansion / contraction body 6 is composed of, for example, a screw-type rod. As shown in FIGS. 1 to 5 and the like, the expansion / contraction body 6 extends and contracts between the mounting portion 10 of the body 11 of the work machine body 2 and the mounting frame 33 of the movable body 3. It is installed (interposed) as possible.

  The extendable body 6 includes a cylindrical female screw member (inner pipe) 41, a shaft-like male screw member 42 that is screwed into the female screw member 41 and rotates in the forward and reverse directions by the power from the motor 7, and the male screw member 42. A cylindrical cylindrical member (outer pipe) 43 covering the outer peripheral side, and the female screw member 41 is connected to the space 44 between the inner periphery of the cylindrical member 43 and the outer periphery of the male screw member 42. Enter and exit according to the rotation.

  The lower end portion of the female screw member 41 is rotatably attached to the attachment frame 33 of the movable body 3 via a left and right shaft 45. An upper end portion of the male screw member 42 is rotatably attached to a pair of left and right fulcrum shafts 46 in the attachment portion 10 of the body 11 via a short cylindrical tumbler 47. The upper end portion of the cylindrical member 43 is fixed to the tumbler 47 with a fixing screw 48.

  Further, the upper end portion of the male screw member 42 is connected and fixed to the output rotating shaft 61 of the motor 7 via a short cylindrical shaft connecting member 49. A bearing 50 is disposed between the shaft connecting member 49 and the tumbler 47, and a bearing 52 is disposed between the retaining portion 51 of the male screw member 42. A bearing 53 is also disposed between the outer periphery of the shaft connecting member 49 and the inner periphery of the bearing boss 65 of the motor frame 64 of the motor 7.

  The motor 7 includes a motor main body 62 having an output rotating shaft 61, a motor case 63 that covers and holds the motor main body 62, and a motor frame 64 fixed to the motor case 63. The motor frame 64 is rotatable with respect to a collar 67 fixed to the left and right fulcrum shaft 46 of the mounting portion 10 of the machine body 11 with a bolt 66. That is, the motor frame 64 of the motor 7 is rotatably attached to the fulcrum shaft 46 of the attachment portion 10 of the body 11 via the collar 67 and the washer 68.

  The female screw member 41 has a screw hole portion 56 at the upper end, the male screw member 42 has a screw shaft portion 57 at a portion other than the upper end side, and the screw shaft portion 57 is inserted and screwed into the screw hole portion 56. Has been. Then, when the male screw member 42 is rotated with respect to the female screw member 41 by the power from the motor main body 62 of the motor 7, the telescopic body 6 expands and contracts.

  That is, when the output rotation shaft 61 of the motor 7 rotates in one direction, the male screw member 42 rotates in one direction together with the output rotation shaft 61, and the female screw member 41 responds to this rotation in the extending direction (the biasing direction of the gas spring 8). ), And as a result, the stretchable body 6 extends. At this time, since the gas spring 8 assists the extension operation of the stretchable body 6, the stretchable body 6 performs the extension operation while receiving the urging force of the gas spring 8.

  On the other hand, when the output rotation shaft 61 of the motor 7 rotates in the other direction, the male screw member 42 rotates in the other direction together with the output rotation shaft 61, and in response to this rotation, the female screw member 41 moves in the contraction direction. The body 6 shrinks. At this time, the stretchable body 6 performs a contracting operation against the urging force of the gas spring 8.

  As shown in FIGS. 1 to 5 and the like, the gas spring 8 is between the mounting portion 10 of the machine body 11 of the work machine body 2 and the mounting frame 33 of the movable body 3 in a state of being slightly contracted from the free length state. It is erected (interposed) so that it can extend and contract.

  The gas spring 8 has a cylindrical cylinder main body 71 filled with a predetermined gas and a rod-shaped rod 72 that enters and exits the cylinder main body 71. And the lower end part which is the front-end | tip part of the rod 72 is attached to the attachment frame 33 of the movable body 3 via the shaft 73 of the left-right direction so that rotation is possible. An upper end portion of the cylinder body 71 is rotatably attached to the attachment portion 10 of the airframe 11 via a left and right shaft 74.

  Further, the agricultural machine 1 detects the work height position of the work machine body 2 (for example, the lower end position of the cutting means 12) and the work height of the work machine body 2 based on the detection by the detection means 76. Control means 77 is provided for controlling the motor 7 so that the position is maintained constant (for example, the upper surface position of the bag a) (see FIG. 3).

  For this reason, for example, even if the farm scene b is lowered or raised, the control unit 77 controls the motor 7 so that the telescopic body 6 expands and contracts and the work implement body 2 moves up and down with respect to the grounding wheel 4. The working height position of the machine body 2 is maintained constant.

  For example, a remote operation means (not shown) that can be operated by an operator who rides on the tractor is provided, and the control means 77 determines the work height position of the work implement body 2 based on the operation of the remote operation means by the worker. The motor 7 may be controlled so as to be maintained constant.

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

  For example, when performing a cutting operation for cutting unnecessary stalks and leaves of a crop planted on the ridge a of the field by using the agricultural machine 1, the agricultural machine 1 is connected to the rear part of the tractor so that the tractor moves forward on the field. While moving in the traveling direction, the rotating shaft body 25 of the cutting means 12 is rotated at a high speed in a predetermined direction by the power from the tractor side.

  Then, the plurality of claws of the cutting means 12 of the work machine body 2 shred the crops and leaves of the vegetation grown on the straw a while rotating at high speed in the predetermined rotation direction together with the rotating shaft 25.

  Here, as shown in FIG. 6, for example, when the field scene b in which the grounding wheel 4 contacts and moves down, the expansion / contraction body 6 is extended based on the power from the motor 7 and the biasing force of the gas spring 8. By the operation, the movable body 3 rotates downward relative to the work machine body 2 together with the grounding wheel 4 about the rotation center axis X.

  In other words, due to the extension operation of the telescopic body 6 by the operation of the motor 7 accompanied by the urging force of the gas spring 8, the field work b is lowered with respect to the ground ring 4 grounded to the field scene b. As a result, the lower end position of the cutting means 12 of the work machine main body 2 returns to the upper surface position of the rod a, and the work height position of the work machine main body 2 is maintained constant.

  Further, as shown in FIG. 7, for example, when the farm scene b in which the grounding wheel 4 is grounded and moved is raised, the power from the motor 7 and the work machine body 2 against the biasing force of the gas spring 8. When the telescopic body 6 contracts with the weight of the movable body 3, the movable body 3 rotates together with the grounding wheel 4 relative to the work machine main body 2 around the rotation center axis X.

  That is, as a result of the retracting operation of the telescopic body 6 by the motor 7 accompanied with the assistance of the work machine body 2 due to its own weight, the entire work machine body 2 is raised by the field scene b with respect to the grounding wheel 4 grounded to the field scene b. As a result, the lower end position of the cutting means 12 of the work machine main body 2 returns to the upper surface position of the rod a, and the work height position of the work machine main body 2 is maintained constant.

  And according to the said agricultural working machine 1, since the motor 7 makes the expansion-contraction body 6 extend-contract, the movable body 3 can be moved up and down with respect to the working machine main body 2 with the grounding wheel 4, Therefore An operator can extend the expansion-contraction body 6 manually. There is no need to extend or retract the arm, reducing the burden on the operator.

  In addition, the gas spring 8 as an urging means urges the expansion / contraction body 6 in the extending direction so as to assist the extension operation of the expansion / contraction body 6 by the motor 7. The heavy work implement main body 2 can be lifted with respect to the grounding wheel 4 while being in contact with b, so that workability can be improved. That is, for example, the work is temporarily interrupted, the whole farm work machine 1 is lifted by the three-point hitch portion of the tractor, the stretchable body 6 is extended by a desired amount, and then the whole farm work machine 1 is lowered to ground the grounding wheel 4. Save time and work efficiently.

  Furthermore, since the motor 7 is assisted by the gas spring 8, it may be relatively small and inexpensive, and the manufacturing cost can be reduced and the weight can be reduced.

  Moreover, since the control means 77 controls the motor 7 so that the work height position of the work machine main body 2 is kept constant, an appropriate work can be performed with high accuracy.

  Furthermore, since the expansion / contraction body 6 is biased in the extending direction by the gas spring 8, the axial center of the female screw member 41 and the axial core of the male screw member 42 are positioned on the same straight line at the time of operation. The telescopic body 6 can be expanded and contracted by (rotational force), and the elastic body 6 can be appropriately expanded and contracted even with a relatively small and inexpensive motor 7.

  That is, FIG. 8A shows a case without a gas spring (comparative example). In this case, only the upward force acts on the stretchable body 6 at the time of work, so that it easily buckles. A large force (rotational force) is required to expand and contract 6. On the other hand, FIG. 8B shows a case (example) with a gas spring. In this case, the stretchable body 6 is not only upward (contraction direction) but also downward (extension direction) during operation. Since the force acts, it is difficult to buckle and the shaft cores of both screw members 41 and 42 are located on the same straight line, so that the telescopic body 6 can be expanded and contracted with a relatively small force (rotational force).

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  In this second embodiment, the agricultural machine 1 is different from the first embodiment in that it performs a tilling work as an agricultural work. That is, this farm work machine 1 is connected to the rear part of a tractor (not shown) that is a traveling vehicle, for example, and moves forward (traveling direction) on the farm field by advancing traveling of the tractor, while performing a tilling work that is agricultural work. To do.

  And this farm work machine 1 is connected to the three-point hitch part (work machine lifting support part) at the rear of the tractor so as to be releasable, A movable body 3 that can be moved up and down in the section, and a pair of left and right gauge wheels and tires that move in contact with the farm scene behind the tire of the tractor and that are rotatably provided below the movable body 3 And a grounding ring 4.

  The movable body 3 is provided at the front portion of the work machine main body 2 so as to be rotatable in the vertical direction around a horizontal rotation center axis X in the horizontal direction. That is, the movable body 3 is rotatable up and down (movable up and down) about the rotation center axis X with respect to the work machine main body 2.

  Also, this agricultural working machine 1 is provided with a telescopic body 6, a motor 7 that is a driving means, and a gas spring 8 that is an urging means, as in the first embodiment. The urging force of the gas spring 8 is, for example, 50% to 100% of the weight of the work machine main body 2, and the weight of the work machine main body 2 is, for example, 200 kgf to 600 kgf.

  Here, the work machine body 2 includes a machine body 81 that is releasably connected to the three-point hitch part at the rear of the tractor, and a tiller body that is rotatably provided on the machine body 81 and performs a tilling operation while rotating in a predetermined direction. 82, and a leveling body 83 that is provided on the body 81 so as to be rotatable up and down and performs leveling work behind the cultivating body 82.

  The airframe 81 has a three-point connecting portion 85 and an input shaft support portion 86 on the front side, and the input shaft 87 is rotatably supported by the input shaft support portion 86. The input shaft 87 is connected to the PTO shaft of the tractor via a joint, and power output from the PTO shaft is input to the input shaft 87. The input shaft 87 is connected to power transmission means (not shown) for transmitting the input power to the tiller 82. The power transmission means includes, for example, a gear in the input shaft support portion 86, a transmission shaft in the frame pipe portion 88, a chain in the transmission case portion 89, and the like.

  The body 81 has a cover 90 that covers the upper part of the tiller 82, and the upper end of the leveling body 83 is rotatably attached to the rear end of the cover 90 via a hinge 91. . Further, the airframe 81 has a pair of left and right arm portions 92 fixed to the frame pipe portion 88 and a plate-shaped attachment portion 93 fixed to the frame pipe portion 88.

  The movable body 3 is attached to the front portion of the arm portion 92 of the machine body 81 via a fixture (bolts, nuts, etc.) 95 so as to be rotatable in the vertical direction about the rotation center axis X that is a rotation fulcrum. A pair of left and right pivot arms 96 are also provided.

  A connecting pipe 97 that is elongated in the left-right direction is installed between the rotating arms 96, and intermediate portions of the rotating arms 96 are integrally connected by the connecting pipe 97. A lower end portion of a plate-like first mounting frame 101 is fixed to one place on the left side of the connecting pipe 97, and the first mounting frame 101 is rotatably supported by a fixture 95 to be an airframe 81. On the other hand, it can be rotated in the vertical direction about the rotation center axis X.

  In addition, the movable body 3 includes a second mounting frame 102 having an elongated plate shape that is rotatably supported by a fixture 95 and can be rotated up and down around the rotation center axis X with respect to the machine body 81. The second mounting frame 102 is disposed in the vicinity of the first mounting frame 101.

  And the upper end part (front-end part) of the expansion-contraction body 6 is attached to the upper part of both the attachment frames 101 and 102 so that rotation is possible. The lower end portion (rear end portion) of the stretchable body 6 is rotatably attached to the rear portion of the attachment portion 93 of the body 81.

  Further, a motor 7 connected and fixed to the upper end portion of the expansion / contraction body 6 is rotatably attached to the upper portions of both the attachment frames 101 and 102. For this reason, the motor 7 rotates with respect to both the attachment frames 101 and 102 integrally with the telescopic body 6.

  Furthermore, the upper end part (front end part) of the gas spring 8 is rotatably attached to the upper part of the second attachment frame 102. The lower end portion (rear end portion) of the gas spring 8 is rotatably attached to the rear portion of the attachment portion 93 of the body 81.

  In addition, a grounding wheel 4 that touches and moves to the farm field while rotating is attached to the lower end of each of the left and right rotating arms 96 of the movable body 3 via a support shaft 103 in the left-right direction. The movable body 3 is composed of a rotating arm 96, a connecting pipe 97, a first mounting frame 101, a second mounting frame 102, and the like.

  Further, in this agricultural work machine 1, the detection means 76 for detecting the work height position of the work machine body 2 (for example, the tilling depth of the tillage body 82) is, for example, a potentiometer that detects the rotation angle of the leveling body 83 relative to the body 81. It is composed of 105. Based on the detection by the potentiometer 105, the control means 77 controls the motor 7 so that the work height position of the work implement body 2 is maintained constant. Moreover, it is good also as a structure provided with the remote operation means so that the operator who got on the tractor can remotely operate the motor 7. FIG.

  And also in the agricultural machine 1 in this second embodiment, the motor 7 can move the telescopic body 6 up and down so that the movable body 3 can be moved up and down together with the grounding wheel 4, thereby reducing the burden on the operator. Since the gas spring 8 assists the extension operation of the telescopic body 6 by the motor 7, for example, the work implement body 2 can be lifted while the grounding wheel 4 is in contact with the field scene during the work, thereby improving workability. The same effects as those of the first embodiment can be achieved.

  In any embodiment, a plurality of gas springs 8 may be provided. That is, for example, as in the third embodiment shown in FIG. The structure etc. which were arrange | positioned in the left-right vicinity may be sufficient.

  Further, for example, as in the fourth embodiment shown in FIG. 13, the grounding wheel 4 may be configured by a pressure-reducing wheel 106 that moves while rotating while being grounded on a farm scene.

  The pressure-reducing wheel 106 performs a pressure-reducing operation behind the leveling body 83 and is rotatably attached to the rotating frame 107 of the movable body 3. The rotation frame 107 is attached to the frame attachment portion 108 of the body 81 so as to be rotatable in the vertical direction about the rotation center axis X.

  And each lower end part (rear end part) of the expansion-contraction body 6 and the gas spring 8 is each attached to the attachment part 109 in the rotation frame 107 so that rotation is possible. The upper end portions (front end portions) of the telescopic body 6 and the gas spring 8 are rotatably attached to the attachment portions 110 of the machine body 81 of the work machine body 2.

  In any of the embodiments, the configuration in which the movable body 3 is provided on the work machine body 2 so as to be rotatable in the vertical direction has been described. However, for example, the movable body 3 can be moved on the work machine body 2 in the vertical direction. A provided configuration or the like may be used.

  Further, the driving means for expanding and contracting the telescopic body 6 is not limited to the motor 7 such as an electric motor or a hydraulic motor, and may be a cylinder or the like, for example.

  Furthermore, the urging means is not limited to the gas spring 8 but can be constituted by an elastic member such as a spring. Further, the grounding body may be a sliding member that grounds and slides on a farm scene.

  The stretchable body 6 is not limited to the configuration having the female screw member 41 on the lower side and the male screw member 42 on the upper side. For example, the elastic body 6 has the female screw member 41 on the upper side and the male screw member 42 on the lower side. The configuration may be also possible.

  Further, the telescopic body 6 is not limited to a configuration in which the output rotation shaft 61 of the motor 7 is directly connected to the male screw member 42, and a configuration in which the output rotation shaft 61 of the motor 7 is connected to the male screw member 42 through a gear, or the like. But you can.

  In addition, although several embodiment of this invention was described, it is also possible to combine the structure of each said embodiment suitably in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Farming machine 2 Working machine main body 3 Movable body 4 Grounding wheel which is a grounding body 6 Telescopic body 7 Motor which is a driving means 8 Gas spring which is a biasing means
41 Female thread member
42 Male thread member
77 Control means

Claims (5)

The work machine body,
A movable body provided on the work machine body so as to be movable up and down;
A grounding body provided on the movable body;
A telescopic body constructed between the work implement main body and the movable body;
Driving means for expanding and contracting the expansion body;
A farming machine, comprising: an urging unit for assisting an extension operation of the stretchable body by the driving unit. The urging means is a gas spring installed between the work implement body and the movable body,
The agricultural machine according to claim 1, wherein the gas spring urges the movable body in a downward movement direction to assist an extension operation of the expansion / contraction body by a driving unit. The agricultural working machine according to claim 1 or 2, wherein the urging force of the urging means is 50% to 100% of the weight of the work machine main body. The elastic body
A female screw member;
A male screw member screwed to the female screw member;
The agricultural working machine according to any one of claims 1 to 3, wherein when the one of the female screw member and the male screw member is rotated with respect to the other, the stretchable body expands and contracts. The agricultural work machine according to any one of claims 1 to 4, further comprising control means for controlling the drive means so that the work height position of the work machine main body is maintained constant.

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