Mowing work machine

Abstract

To provide a mowing work machine capable of properly preventing scattering of scattered matter.SOLUTION: A mowing work machine 1 is used by being connected to a three-point link part in the rear of a tractor. The mowing work machine 1 comprises a work body 51 that performs mowing work while rotating in an up-cut direction, and an elastic plate 81 for scattering prevention, which covers the front side of the work body 51. The elastic plate 81 has its lower end grounded on a work plane S in the state of being positioned perpendicular to the work plane S during the mowing work.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a brush cutting machine. [Background technology]

[0002] BACKGROUND ART A conventional brush cutter is known, for example, as described in Patent Document 1 below.

[0003] This conventional brush cutting machine is used by connecting it to the rear of a tractor, which is a traveling vehicle, and is equipped with a working body that cuts grass while rotating in a predetermined direction, and an elastic body such as a front cover that covers the front side of the working body to prevent scattering. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-102225 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned conventional grass cutting machine, a gap exists between the lower end of the elastic body and the working surface during grass cutting, causing scattered objects from the working body (such as pebbles, soil, grass clippings, and foreign objects) to fly forward through the gap.

[0006] Therefore, one of the objects of the embodiment of the present invention is to provide a brush cutter that can appropriately prevent scattering of debris. [Means for solving the problem]

[0007] The mowing machine according to an embodiment of the present invention is a mowing machine that is used by being connected to a traveling vehicle, and comprises a working body that performs the mowing work, and an elastic body that covers the front side of the working body to prevent scattering, and the lower end of the elastic body is in contact with the work surface during mowing work.

[0008] In addition, the mowing machine according to an embodiment of the present invention is a mowing machine that is used by being connected to a traveling vehicle, and comprises a working body that performs the mowing work, and an elastic body that covers the front side of the working body to prevent scattering, and the elastic body is positioned perpendicular to the work surface during mowing work, with its lower end in contact with the work surface. [Effects of the Invention]

[0009] According to the embodiment of the present invention, scattering of scattered objects can be appropriately prevented. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a side view of a brush cutter according to an embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. 2 is a side view of the same brush cutter during operation (in a working posture). [Figure 7] 10(a) to 10(c) are side views showing different cutting heights during operation. [Figure 8] 10(a) and 10(b) are explanatory diagrams illustrating a case where the elastic plate is largely elastically deformed during work. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the present invention will be described with reference to FIGS.

[0012] In the drawing, reference numeral 1 denotes a grass cutting machine, which is an agricultural work machine, and this grass cutting machine 1 is a flail mower that is used by being connected (mounted) to the rear of a tractor, which is a traveling vehicle (not shown).

[0013] That is, the mowing machine 1 is detachably connected to the rear of the tractor, and moves forward (in the direction of travel) as the tractor travels, performing predetermined work, i.e., mowing work (agricultural work).

[0014] More specifically, the grass cutting implement 1 is connected to a three-point linkage (agricultural implement lifting device) at the rear of the tractor, and moves forward as the tractor travels forward, cutting and shredding the grass to be cut (for example, weeds, straw, second ears of wheat, green manure, etc.). The grass cutting implement 1 is an offset implement that can be offset to the side of the tractor, i.e., to the right, for example.

[0015] As shown in Figures 1 to 3, the brush cutting machine 1 comprises an attachment section 5 that is detachably connected (attached) to a three-point link section at the rear of the tractor, a working section (brush cutting working section) 6 that can be changed between a stored state and an offset state (position can be changed left and right) and can also be changed between a horizontal position and an inclined position (position can be changed up and down), and that mainly performs brush cutting work in a desired offset state (for example, a maximum offset state where it is positioned at the maximum offset position), and a connecting section (offset mechanism section) 7 that connects the front and rear attachment sections 5 and the working section 6.

[0016] The brush cutter 1 also includes a remote control operation device (not shown) that is an operation unit that allows a worker (operator) on the tractor to remotely operate the working unit 6, a drive unit 12 that moves the working unit 6 to change its position (state, attitude), a first detection unit 13 that detects the offset amount (amount of movement in the left-right direction) of the working unit 6 relative to the tractor, a second detection unit 14 that detects the attitude angle (amount of rotation in the up-down direction) of the working unit 6 relative to the tractor, and a control unit (control box) 15 that controls the drive unit 12 based on information (signals) from the first detection unit 13, the second detection unit 14 and the remote control operation device. Additionally, the brush cutter 1 includes a sound generation unit 10 that, under the control of the control unit 15, generates a sound (warning sound, etc.) to alert people around the working unit 6 that the position of the working unit 6 is being changed.

[0017] The drive unit 12 has a first cylinder (offset cylinder) 16, which is an extendable and retractable first drive means for offsetting the working unit 6 to move left and right relative to the mounting unit 5, and a second cylinder (tilt cylinder) 17, which is an extendable and retractable second drive means for changing the posture of the working unit 6 to rotate up and down about a rotation center axis (rotation fulcrum) 11 in the front-to-rear direction relative to the connecting unit 7. The cylinders 16 and 17 are, for example, electric hydraulic cylinders. The detection units (sensors) 13 and 14 are, for example, potentiometers. The sound generation unit 10 is, for example, a buzzer.

[0018] Furthermore, the mowing machine 1 is equipped with a power transmission unit 18 that transmits power from the tractor side, and the working unit 6 performs the mowing work based on the power from this power transmission unit 18. That is, for example, the working body 51 of the working unit 6 performs the mowing work while rotating in a predetermined direction, the up-cut direction (the direction of the arrow shown in Figure 1), based on the power from the power transmission unit 18.

[0019] Here, the working unit 6 can perform grass cutting not only in the offset state but also in a stored state where it is stored in the rear of the tractor. The stored state is a state where the working unit 6 is located in a stored position at the rear of the tractor (a position where substantially the entire working unit 6 is stored within the width of the tractor). The offset state is a state where the working unit 6 is located in an offset position that is shifted to the right by a desired offset amount (movement amount) from the stored position at the rear of the tractor.

[0020] The working unit 6 can be moved left and right relative to the tractor (mounting unit) between the storage position and the maximum offset position by extending and retracting the first cylinder 16, and can be positioned at either of these positions or at any position between them.

[0021] In addition, the working unit 6 can perform grass cutting work in either a horizontal position along the horizontal left-right direction or an upward or downward inclined position (an upward inclined position with the left low and the right high, or a downward inclined position with the left high and the right low).

[0022] The working unit 6 can be rotated up and down around the longitudinal pivot axis 11 relative to the tractor (mounting unit) by extending and retracting the second cylinder 17 between the maximum upward tilt position (the highest position where the right end of the working unit is located) and the maximum downward tilt position (the lowest position where the right end of the working unit is located), and can be positioned at either of these positions and any position between them (including a horizontal position corresponding to a horizontal posture).

[0023] In addition, an operator in the driver's seat of the tractor can rotate the working unit 6 up and down about the rotation central axis 11 between the maximum upward tilt position and the maximum downward tilt position (including the horizontal position) by operating the remote control device to extend and retract the second cylinder 17, whether the tractor is in the stored state or the offset state. As an example of the maximum tilt angle of the working unit 6, the maximum upward tilt angle is, for example, 70°, and the maximum downward tilt angle is, for example, 55°.

[0024] The mounting section 5 has a hitch frame 21, which is a connecting frame (mounting frame), and this hitch frame 21 is provided with a three-point connecting section 22 that is detachably connected to a three-point link section at the rear of the tractor. The three-point connecting section 22 has a top mast 24 that holds a top pin 23 and a pair of left and right lower arms 26 that hold lower pins 25.

[0025] The hitch frame 21 is also provided with an input shaft holder 29 that rotatably holds an input shaft 28 that receives power from the tractor. The input shaft 28 is connected to the PTO shaft of the tractor via a joint, and inputs power from the PTO shaft to the brush cutter 1. Furthermore, an arm attachment portion 30 is provided on the right side of the hitch frame 21.

[0026] The connecting portion 7 has two pivoting arms (parallel links) 41 whose front ends are rotatably attached to the arm mounting portion 30 via axes 46, and the rear ends of each connecting arm 41 are rotatably attached to the arm mounting member 42 via axes 47.

[0027] Furthermore, a rotation center shaft 11 in the front-to-rear direction is fixed to the arm mounting member (fulcrum frame) 42, and this rotation center shaft 11 is held by a bearing tube portion 36 of a bearing member 31 of the working unit 6, and this bearing member 31 is rotatable about the rotation center shaft 11. In other words, the working unit 6 is rotatable in the up-and-down direction about the rotation center shaft 11 (center shaft portion) 11, which is a round shaft fixed to the arm mounting member (arm mounting portion) 42 of the connecting unit 7.

[0028] The second detector 14 detects the rotation angle of the bearing member 31 relative to the rotation center axis 11 of the connecting part 7, in other words, the vertical rotation angle of the working part 6 relative to the mounting part 5, and transmits this information to the control part 15. The first detector 13 detects the horizontal rotation angle of the connecting arm 41 relative to the mounting part 5, and transmits this information to the control part 15.

[0029] The arm mounting member 42 also has a cylinder mounting portion 43, to which the tip of the rod 17a of the second cylinder 17 is rotatably mounted via a headed pin 44 welded to a plate 66 bolted to the cylinder mounting portion 43.

[0030] Similarly, the base end of the cylinder body 17b of the second cylinder 17 is rotatably attached to a cylinder mount 48 via a headed pin 45 welded to a plate 67 that is bolted to the cylinder mount 48. The cylinder mount 48 is bolted to the upper surface of a cover body 75 of the working unit 6. The front side of the second cylinder 17 is covered with a cylinder cover member 70.

[0031] The working unit 6 has a working body (grass-cutting working body) 51, which is a working means that performs grass-cutting work (the work of cutting and shredding grass growing on the work surface, which is the surface to be worked on), while rotating in a predetermined up-cut direction (the direction of the arrow shown in Figure 1) based on power from the power transmission unit 18 that transmits power from the tractor side, a cover means 52 that covers this working body 51, a gauge roller 50 which is a ground contact wheel arranged behind the working body 51, and a scraper 49 that removes deposits (soil, etc.) that have adhered to this gauge roller 50.

[0032] The working unit 6 also has a pulley case 53, which is a first transmission case body that houses multiple pulleys 56, 57, 58 and a belt 59, etc., and a gear case (transmission case) 54, which is a second transmission case body that houses multiple gears (not shown), etc.

[0033] The belt 59 in the pulley case 53 is wound around a drive pulley 56, a driven pulley 57, and a tension pulley 58, and the tension pulley 58 is biased by a tension spring 60, which serves as a biasing body. The biasing force of the tension spring 60 can be adjusted by a tension bolt 55.

[0034] An intermediate input shaft 61 is rotatably held by the gear case 54, and a power transmission means 62 that transmits power from the input shaft 28 is connected to the intermediate input shaft 61. The power input to the intermediate input shaft 61 from the power transmission means 62 is then transmitted to the working body 51, and as a result, the working body 51 is driven to rotate in a predetermined direction, that is, an up-cut direction, to perform grass cutting work.

[0035] The working body 51 has a rotating shaft 71 that is elongated in the left-right direction, and a plurality of working claws, or grass-cutting claws 74, that are detachably attached to each claw mounting portion 72 of the rotating shaft 71 via mounting members 73 and rotate in the up-cut direction together with the rotating shaft 71 to perform grass-cutting work.

[0036] The cover means 52 has a generally plate-shaped cover body 75 that is elongated in the left-right direction and covers the upper side of the working body 51, and left and right cover side plates 76 that cover the lateral sides of the working body 51, and the rotating shaft 71 of the working body 51 is rotatably supported by these cover side plates 76. The pulley case 53 is fixed to the outer surface of the left cover side plate 76.

[0037] An elastic plate 81, which is an elastic body capable of elastic deformation and serves to prevent scattering and covers the front side of the working body 51, is detachably attached to the front surface of the cylindrical portion 80 at the front end of the cover body 75 by means of attachment means 82. In the illustrated example, the attachment means 82 is made up of, for example, a pressing plate 83, bolts 84, and nuts 85, but any other means may be used.

[0038] The elastic plate (guard rubber) 81 is made of a rubber material (it can also be made of resin or metal, etc.) that is elongated in the left-right direction and is a scattering prevention member that prevents objects (e.g., pebbles, soil, grass clippings, foreign objects, etc.) from flying forward from the working body 51 while it is rotating in the up-cut direction during grass cutting work.

[0039] 3, the elastic plate 81 has a plurality of vertically elongated slits 86 positioned side by side at equal intervals in the left-right direction. In other words, the elastic plate 81 is formed with a plurality of vertically elongated slits 86 for facilitating elastic deformation of the elastic plate 81.

[0040] 4, left and right shaft attachment parts 92 protrude forward from the arm attachment part 30 on the right side of the mounting part 5, and a left-right shaft member 91 is detachably attached to the tip end of each of these shaft attachment parts 92. This shaft member 91 is rotatably inserted into the upper cylindrical part 90 of the lower arm 26. Therefore, the connecting arm (parallel link) 41 of the connecting part 7 can rotate up and down together with the arm attachment part 30 around the shaft member 91.

[0041] That is, the connecting arm (parallel link) 41 of the connecting part 7 is rotatable in the up-down direction about a left-right axis (rotation center axis) X relative to the hitch frame 21 of the mounting part 5. The left-right axis X is an imaginary line passing through the axis of the round shaft member 91.

[0042] As shown in FIG. 5, the connecting arm 41 of the connecting portion 7 is vertically rotatable relative to the hitch frame 21 between an upper limit rotation position and a lower limit rotation position about an axis X in the left-right direction.

[0043] 5, the planar contact portion 93 of the mounting portion 92 comes into contact with the restricting plate 94, restricting downward rotation of the connecting arm 41 of the connecting portion 7 and positioning the connecting arm 41 at the lowest rotation limit position. On the other hand, as shown by the two-dot chain line in FIG. 5, the angular contact portion 95 of the arm mounting portion 30 comes into contact with the restricting plate 96, restricting upward rotation of the connecting arm 41 of the connecting portion 7 and positioning the connecting arm 41 at the highest rotation limit position.

[0044] The working unit 6 is connected to the rear end of the connecting arm 41 of the connecting unit 7, and the working unit 6 and the connecting unit 7 form a vertically rotating unit 100. The vertically rotating unit 100 is capable of rotating in the vertical direction about a left-right axis X relative to a hitch frame (connecting frame) 21 connected to the rear of the tractor.

[0045] As shown in Figures 6 and 7, the working unit 6 has left and right grounding plates 101, which are longitudinal, plate-shaped grounding bodies in the front-to-rear direction and can change (adjust) the cutting height dimension A, which is the distance between the work surface (ground, etc.) S on which the grass to be mowed grows and the lower end of the working body 51 (the lower end of the rotation trajectory of the mowing claws 74).

[0046] In the illustrated example, the cutting height dimension A can be selectively changed to one of three values, for example, "1.5 mm" (minimum value), "9.5 mm" (intermediate value), and "17.5 mm" (maximum value).

[0047] The numerical values ​​shown as examples are not strict values ​​and some increase or decrease is permitted (the same applies below). Furthermore, the cutting height dimension A may be configured to be changeable in, for example, four or more stages, or may be configured to be changeable continuously within a predetermined range.

[0048] The ground plate 101 is provided at the bottom of the cover side plate 76 that covers the side of the working body 51 so that it can be adjusted to rotate up and down around a rotation fulcrum P on the front end side. That is, a plurality of adjustment holes 102, for example, three (102a, 102b, 102c), are formed in the cover side plate 76, and a bolt 103 is inserted into one adjustment hole 102 selected from these three adjustment holes 102, thereby attaching the ground plate 101 to the cover side plate 76 so that it can be adjusted to rotate up and down.

[0049] As can be seen from Figures 6 and 7, even if the cutting height dimension A is changed to any of the possible values ​​(for example, the three adjustable values ​​shown) by adjusting the ground plate 101 by rotating it up and down based on the selection of the adjustment hole 102, the anti-scattering elastic plate 81 will be positioned perpendicular (including approximately perpendicular) to the work surface S and its lower end will be in contact with the work surface S when the work body 51 is performing grass cutting work.

[0050] 7(a) is a side view during operation when the bolt 103 is inserted into the adjustment hole (first adjustment hole) 102a and the ground plate 101 is attached to the cover side plate 76. In this case, the cutting height dimension A is 1.5 mm, and the angle α between the elastic plate 81 and the working surface S is 93°.

[0051] 7(b) is a side view during operation when the bolt 103 is inserted into the adjustment hole (second adjustment hole) 102b and the ground plate 101 is attached to the cover side plate 76. In this case, the cutting height dimension A is 9.5 mm, and the angle α between the elastic plate 81 and the working surface S is 91.5°.

[0052] 7(c) is a side view of the cover side plate 76 during operation when the bolt 103 is inserted into the adjustment hole (third adjustment hole) 102c and the ground plate 101 is attached to the cover side plate 76. In this case, the cutting height dimension A is 17.5 mm, and the angle α between the elastic plate 81 and the work surface S is 90°. In the illustrated example, the elastic plate 81 before elastic deformation during operation assumes a substantially vertical shape that is slightly inclined with the front lower and the rear higher so that the upper end is positioned rearward in the direction perpendicular to the work surface S (the up-down direction).

[0053] In this way, in either case, when the working body 51 rotates in the up-cut direction to perform grass cutting work with the left and right ground plates 101 and the gauge roller 50 in contact with the work surface S, the elastic plate 81, which prevents debris from flying forward from the rotating working body 51, is positioned perpendicular to the work surface S with its lower end in contact with the work surface S.

[0054] The gauge roller 50, which is elongated in the left-right direction, is rotatably supported by bosses 105 on the left and right ground plates 101, and each ground plate 101 is fitted with a plate-shaped boss guard 106.

[0055] Next, the operation of the brush cutting machine 1 will be described.

[0056] For example, when the working unit 6 is set to the working posture shown in Figure 6, and the mowing machine 1 is moved in the forward direction (forward) by driving the tractor forward, as shown in Figure 6, the elastic plate 81, the ground plate 101 and the gauge roller 50 are in contact with the work surface S, and the working body 51 rotates in the up-cut direction to perform the mowing work.

[0057] At this time, the elastic plate 81 moves in the direction of travel while the entire plate is positioned vertically (including approximately vertically) relative to the work surface S and with its lower end in contact with the work surface S (including in contact with the work surface S via fallen grass).

[0058] Therefore, there is almost no gap between the lower end of the vertical elastic plate 81 and the work surface S, and debris flying from the work body 51 while rotating in the up-cut direction is prevented from flying forward by contact with the vertical elastic plate 81.

[0059] Here, as shown in Figure 8(a), even if the elastic plate 81, which is vertical before elastic deformation, is greatly elastically deformed toward the working body 51 due to contact with a contacted object a such as a young tree or a stone, that is, even if the elastic plate 81 is elastically deformed so that the part excluding the upper end becomes horizontal, the lower end of the elastic plate 81 after this elastic deformation will not come into contact (abut) with the grass-cutting claws 74 of the working body 51.

[0060] That is, a gap (clearance) 110 exists between the lower end of the elastic plate 81 after elastic deformation and the grass cutting claw 74, and the dimension b of this gap 110 is, for example, 10 mm or more, and preferably, for example, 20 mm.

[0061] On the other hand, as shown in FIG. 8(b), if the elastic plate 81 (81a), which is inclined such that it is higher in front and lower in rear before elastic deformation, is significantly elastically deformed toward the working body 51 upon contact with a contacted object a, such as a young tree or a stone, that is, if the elastic plate 81 (81a) is elastically deformed so that the portion excluding the upper end becomes horizontal, the lower end of the elastic plate 81 (81a) after this elastic deformation may come into contact with the grass-cutting claws 74, potentially damaging the elastic plate 81 (81a). Therefore, to avoid such damage, it is preferable that the elastic plate 81 be arranged so that it is vertical before elastic deformation. Note that the vertical length dimension c of the elastic plate 81 shown in FIG. 8(a) is shorter than the vertical length dimension c' of the elastic plate 81 (81a) shown in FIG. 8(b).

[0062] Furthermore, according to the above-mentioned mowing machine 1, the lower end of the elastic plate 81 comes into contact with the work surface S during mowing work, so there is no gap between the lower end of the elastic plate 81 and the work surface S, and the elastic plate 81 can appropriately and effectively prevent debris from flying forward from the working body 51 side.

[0063] Furthermore, since the elastic plate 81 is positioned perpendicular to the work surface S during grass cutting work and its lower end contacts the work surface S, even if the elastic plate 81 comes into contact with a contacted object a, such as a young tree, as shown in Figure 8(a) and is elastically deformed relatively significantly toward the working body 51, it will not come into contact with the working body 51, and damage to the elastic plate 81 can be avoided. Moreover, the vertical length of the elastic plate 81 can be kept to the minimum required, which allows for cost reduction.

[0064] Furthermore, when mowing the grass, the worker on the tractor can visually check the contact state of the lower end of the elastic plate 81 with the work surface S, and can easily visually confirm that the posture of the working part 6 during work is appropriate.

[0065] The working part of the grass cutting machine, which is an agricultural work machine, is not limited to one that performs grass cutting work by rotating around a left-right rotation axis (horizontal axis), but may also be one that performs grass cutting work by rotating around an up-down rotation axis (vertical axis), for example.

[0066] Furthermore, the working unit is not limited to a rotary type, and may be, for example, a type having a reciprocating cutting blade, such as a reciprocating mower. Note that, as a driving means for driving the rotating shaft and cutting blade, for example, a hydraulic pump, a hydraulic motor, an electric motor, etc. may be used.

[0067] Furthermore, the grounding body that can change the cutting height dimension is not limited to one that can be rotated and adjusted in the vertical direction on the cover side plate around a pivot point on the front end side, but may also be, for example, one that can be moved and adjusted in the vertical direction on the cover side plate. [Explanation of symbols]

[0068] 1. Grass cutting machine 6 Working section 21 Hitch frame, a connecting frame 51 Work Body 76 Cover side plate 81 Elastic plate, an elastic body 100 Vertical rotation part 101 Ground plate as a grounding body A Cutting height dimension S work surface X axis

Claims

1. A brush cutting machine used by being coupled to a traveling vehicle, A working body that performs grass cutting work, a scattering prevention elastic body covering the front side of the working body; The elastic body has a lower end that contacts the work surface during mowing work. A grass cutting machine characterized by:

2. A brush cutting machine used by being coupled to a traveling vehicle, A working body that performs grass cutting work, a scattering prevention elastic body covering the front side of the working body; The elastic body is positioned perpendicular to the work surface during mowing work, with its lower end in contact with the work surface. A grass cutting machine characterized by:

3. The cutting height dimension, which is the distance between the working body and the work surface, can be changed. The elastic body has a lower end that contacts the work surface during mowing work even when the cutting height dimension is changed by the grounding body.

3. The brush cutter according to claim 1 or 2.

4. The grounding body is provided on the cover side plate that covers the work body so that it can be rotated up and down.

4. The brush cutter according to claim 3.

5. The elastic body does not come into contact with the work body even when it is elastically deformed toward the work body.

3. The brush cutter according to claim 1 or 2.

6. a connecting frame connected to the traveling vehicle; a vertical rotation unit that can rotate in the vertical direction around a left-right axis relative to the connecting frame, The vertical rotation unit has a working unit including at least a working body and an elastic body.

3. The brush cutter according to claim 1 or 2.

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