Field work machine

Abstract

To provide a field work machine in which entanglement of a foreign material with a ground leveling body is prevented.SOLUTION: A field work machine includes a machine body provided with a wheel for travel and capable of traveling in a field. The field work machine includes ground leveling bodies 17, 18, 19, 30 that level the field. The field work machine includes a work device 5 that performs ground work with respect to the field. The field work machine includes a ground leveling body protection member 54 that is provided in front of the ground leveling body 17 and guides a foreign material in front of the ground leveling body 17 to a side of the ground leveling body 17 along with advancement of the machine body.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to the configuration of a work device in a field work machine such as a riding rice transplanter or a riding direct seeding machine. [Background technology]

[0002] In a riding rice transplanter, which is an example of a field work machine, a seedling planting device (corresponding to a work device) is provided at the rear of the machine body, and a float that comes into contact with the rice field surface is provided on the seedling planting device, as disclosed in Patent Document 1. In Patent Document 1, a rake-shaped ground leveling member is attached to the seedling planting device so that it is positioned forward of the float. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-208081 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, in fields such as rice paddies where impurities such as straw scraps and other obstacles are scattered across the rice field surface, the impurities in the field can become entangled in the floats and other land leveling equipment as the machine moves forward, and these impurities and other obstacles can affect the floats and other land leveling equipment. For example, if the impurities become increasingly entangled in the floats and have an effect on the land leveling equipment, this can disrupt the working height, which can interfere with ground work by the work equipment (such as planting seedlings, which are agricultural materials, or supplying seeds, chemicals, fertilizers, etc., which are agricultural materials, to the rice field surface). The main function of the ground leveling member of Patent Document 1 is to level the surface of the rice field, and therefore it is insufficient to prevent impurities on the surface of the rice field and other obstacles from affecting the ground leveling member.

[0005] The present invention aims to prevent obstacles such as debris in the field from becoming entangled in the ground leveling body of a field work machine. [Means for solving the problem]

[0006] The field work machine of the present invention comprises a body equipped with wheels for running and capable of running on a field, a leveling body attached to the rear of the body for leveling the field, a work device for performing ground work on the field, and a leveling body protection member attached in front of the leveling body for protecting the leveling body from the front.

[0007] According to the present invention, debris on the field in front of the soil leveling body, such as a float, is guided laterally by the soil leveling body protection member as the machine body moves forward. Since the soil leveling body passes to the side of the guided debris, the debris on the field is less likely to become entangled with the soil leveling body. In this way, the soil leveling body is protected from debris by the soil leveling body protection member. By reducing the amount of debris on the field that gets entangled in the ground leveling device, the work of the implements on the field can be carried out more smoothly with less obstruction from the debris. In addition, for obstacles other than impurities, the obstacle can be prevented from affecting the leveling body by, for example, contacting the leveling body protection member before the obstacle comes into contact with the leveling body, for example by slowing down or stopping the machine.

[0008] In the present invention, it is preferable that the front end of the right part of the ground leveling body protection member and the front end of the left part of the ground leveling body protection member are connected, and that the right part, in a plan view, extends diagonally rear to the right from the connecting part between the front end of the right part and the front end of the left part, and that the left part, in a plan view, extends diagonally rear to the left from the connecting part between the front end of the right part and the front end of the left part.

[0009] According to the present invention, debris on the rice field surface in front of the float is guided to the left and right by the soil leveling body protection member as the vehicle moves forward. Since the debris in front of the leveling body is guided separately to the right and left, it is less likely to be guided biased to one side, which is advantageous in that it reduces the amount of debris that gets entangled in the leveling body.

[0010] Furthermore, as the machine body moves forward, when the soil leveling body protection members guide debris sideways, loads are placed on the soil leveling body protection members from muddy water and debris in the field. According to the present invention, the ground-leveling body protection member has a shape that is nearly symmetrical in a plan view. As a result, the loads acting on the right and left parts of the ground-leveling body protection member are in opposite directions and cancel each other out, so that the ground-leveling body protection member moves forward stably along the field surface as the machine body moves forward.

[0011] In the present invention, it is preferable that the ground leveling body protection member has a horizontal frame that is connected along the left-right direction across the right portion and the left portion.

[0012] As the machine body moves forward, a load is generated from muddy water and debris that tends to move the right and left parts of the ground leveling body protection member closer to each other. According to the present invention, the horizontal frame is connected across the right and left parts of the ground-leveling body protection member, so that the ground-leveling body protection member can sufficiently withstand the loads described above.

[0013] In the present invention, it is preferable that the soil leveling body protection member has a partition portion that allows at least one of mud and water on the surface of the rice field to pass rearward as the machine body moves forward.

[0014] As the machine body moves forward, the leveling body protection members guide debris sideways, but the leveling body protection members also guide mud and water sideways, which is undesirable for the work equipment to do on the rice field surface. According to the present invention, a partition is provided in the ground leveling body protection member, so that as the machine body moves forward, impurities are guided sideways by the ground leveling body protection member, whereas rice field mud and water flow rearward through the partition of the ground leveling body protection member and are less likely to be guided sideways. This reduces the situation where mud or water on the rice field surface is guided sideways, hindering the work of the work equipment on the rice field surface.

[0015] In the present invention, the leveling body comprises a leveling rotor arranged across the left and right of the work device, and a group of floats arranged in a row, and the center float arranged in the center of the group of floats has a front leveling section and a rear leveling section that is wider in the left and right directions than the front leveling section, and the leveling body protection member has a guide section that extends across the left and right rear, and it is preferable that the left and right end points of the guide section are located outboard of the front leveling section on the left and right.

[0016] As with the above configuration, by guiding debris, mud, etc. to a position relatively far outward in the left-right direction from the center float, debris, mud, etc. can be prevented from running up onto the center float. Generally, the center float has a detection function. In this way, by preventing debris, mud, etc. from running up onto the center float, detection failures can be reduced.

[0017] In the present invention, it is preferable that the machine be provided with a height sensor that detects the height from the center float to the working device as the height from the field to the working device, a setting unit that can set and change the set height from the field to the working device, and a lifting control unit that raises and lowers the working device relative to the machine body so that the detection value of the height sensor becomes the set height.

[0018] In a paddy field working machine or other farm equipment, a height sensor, a setting unit, and a lifting control unit are provided, and the working implement is sometimes raised or lowered relative to the machine body so that the value detected by the height sensor matches the set height. By changing the set height using the setting unit, the height of the working implement maintained relative to the rice field surface is changed (for example, in the case of a seedling planting machine, the seedling planting depth is changed).

[0019] In this case, the center float, which is attached to the left and right center of the working device so that it can be raised and lowered, is suitable for detecting the height from the field floor to the working device, so by detecting the height from the center float to the working device using a height sensor, the height from the field floor to the working device can be properly detected.

[0020] According to the present invention, the ground leveling body protection member guides foreign matter in front of the center float to the side of the center float. By reducing the amount of debris that gets entangled in the center float, it is possible to reduce the interference caused by debris with the work performed by the work equipment, and it is also possible to prevent a decrease in the accuracy of height detection by the height sensor, thereby improving the accuracy of the lifting operation that maintains the height from the field floor to the work equipment at the set height.

[0021] In the present invention, the leveling rotor is attached to the work device so that it can swing up and down, and is thereby attached so that its height can be changed relative to the work device by a height change unit, and the leveling body protection member is attached to the leveling rotor so that it can swing up and down, and is connected between the leveling body protection member and the work device, and it is preferable that a linking member is provided that changes the position of the leveling body protection member relative to the leveling rotor so that the leveling body protection member is maintained in a position that is in line with the field scene based on the change in height of the leveling rotor relative to the work device by the height change unit.

[0022] When the earth leveling rotor is attached to the work device so that its height can be changed, the earth leveling rotor may be attached to the work device so that it can swing. In the above-described configuration, when the leveling body protection member is attached to the leveling rotor, if the leveling rotor is changed in height upward relative to the work device, the leveling body protection member tends to assume a front-upward position, and if the leveling rotor is changed in height downward relative to the work device, the leveling body protection member tends to assume a front-downward position.

[0023] According to the present invention, the ground-leveling body protection member is attached to the ground-leveling rotor so as to be swingable up and down, and the linking member connects the ground-leveling body protection member and the working device across the range. As a result, when the leveling rotor is changed in height above (below) the work device, the change in the positional relationship between the leveling rotor and the work device is transmitted to the leveling body protection member via the connecting member, and the attitude of the leveling body protection member relative to the leveling rotor is changed, making it easier to maintain the attitude of the leveling body protection member in an appropriate attitude, which is advantageous in terms of maintaining the leveling body protection member's function of guiding impurities.

[0024] In the present invention, it is preferable that the soil leveling rotor has a blade portion with a large diameter and a small diameter portion with a small diameter, and the left and right end points of the guide portion are located at the left and right positions where the small diameter portion is located.

[0025] According to the present invention, it is possible to prevent impurities and mud from flowing into the blade portion having a large diameter, and to suppress the impurities and mud from being caught in the blade portion and growing.

[0026] In the present invention, it is preferable that the ground leveling body protection member is provided with an obstacle detection section, which outputs a detection signal when the ground leveling body protection member comes into contact with an obstacle to a predetermined extent or more.

[0027] With the above configuration, the obstacle detection unit outputs a detection signal when it comes into contact with an obstacle more than a predetermined level, and based on the detection signal, the aircraft can be slowed down or stopped, for example, to prevent the obstacle from affecting the leveling body. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a left side view of a riding rice transplanter. [Figure 2] This is a plan view of the planting transmission case, ground leveling device, and debris guide member of the seedling planting device. [Figure 3] This is a plan view of the center float and side float of the seedling planting device, the ground leveling device, and the debris guide member. [Figure 4] FIG. 2 is a left side view of the vicinity of the ground leveling device and the debris guide member. [Figure 5] FIG. 2 is a front view of the vicinity of the center float and the debris guide member. [Figure 6] 10 is a diagram showing the relationship between the lifting control of the seedling planting device and the lifting control of the soil leveling device. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0029] Figures 1 to 6 show a riding rice transplanter, which is a paddy field working machine as an example of a field working machine, and in Figures 1 to 6, F indicates the forward direction, B indicates the backward direction, U indicates the upward direction, D indicates the downward direction, R indicates the right direction, and L indicates the left direction.

[0030] (Overall configuration of riding rice transplanter) As shown in Figure 1, a machine body 3 is supported by right and left front wheels 1 (corresponding to wheels for running) and right and left rear wheels 2 (corresponding to wheels for running). A link mechanism 4 extends rearward from the rear of the machine body 3, and a seedling planting device 5 (corresponding to a working device) is attached to the rear of the link mechanism 4. A fertilizing device 6 (corresponding to a working device) is attached between the rear of the machine body 3 and the seedling planting device 5, and a soil leveling rotor 30 (corresponding to the "soil leveling body" of this invention) is attached to the front of the seedling planting device 5.

[0031] A hydraulic cylinder 7 is connected between the rear of the machine body 3 and the link mechanism 4. When the hydraulic cylinder 7 is extended or retracted, the link mechanism 4 is raised or lowered, and the link mechanism 4 raises or lowers the seedling planting device 5.

[0032] A driver's seat 8 and a steering handle 9 for steering the front wheels 1 are provided on the machine body 3. Right and left support frames 10 are connected to the right and left parts of the front of the machine body 3 and extend upward, and a spare seedling tray 11 is attached to the support frames 10.

[0033] (Configuration of seedling planting device) As shown in Figures 1, 2, and 3, the seedling planting device 5 has a feed case 12, a support frame 13, a planting transmission case 14, a rotating case 15, a planting arm 16, a center float 17 (equivalent to a float), side floats 18 and 19 (equivalent to floats), and a seedling tray 20, and is configured as an 8-row planting type.

[0034] A feed case 12 is attached to the lower rear part of the link mechanism 4 in a rolling manner, and a square pipe-shaped support frame 13 is connected to the feed case 12 and extends in the left-right direction. Four planting transmission cases 14 are connected to the support frame 13 and extend rearward.

[0035] A rotating case 15 is rotatably attached to the right and left rear parts of the planting transmission case 14, and a pair of planting arms 16 are attached to the rotating case 15. A seedling tray 20 on which seedlings (corresponding to agricultural materials) are placed is supported by the planting transmission case 14 so as to be able to move back and forth in the left-right direction.

[0036] The power of an engine (not shown) mounted on the machine body 3 is transmitted to a transmission mechanism (not shown) inside the feed case 12 via a transmission shaft 26. A cylindrical cover 37 is connected across adjacent planting transmission cases 14. The power of the transmission mechanism inside the feed case 12 is transmitted to the rotating case 15 via a transmission shaft (not shown) inside the cover 37 and a transmission mechanism (not shown) inside the planting transmission case 14, and the rotating case 15 is rotated counterclockwise in FIG. 1.

[0037] As the machine body 3 moves forward, the leveling rotor 30 levels the rice field G (see Figures 4, 5, and 6). In the seedling planting device 5, the seedling tray 20 is driven back and forth in the left-right direction, while the rotating case 15 is driven to rotate, and the planting arm 16 takes the seedlings from the seedling tray 20 and plants them in the rice field G.

[0038] (Configuration of fertilizer application device) As shown in FIGS. 1 and 3, the fertilizer applicator 6 has a hopper 21, a delivery unit 22, a blower 23, a furrow former 24, and a hose 25.

[0039] A delivery section 22 is attached to the rear of the machine body 3, and a hopper 21 is attached to the top of the delivery section 22, and fertilizer (corresponding to agricultural materials) is stored in the hopper 21. A furrow former 24 is attached to the center float 17 and the side floats 18, 19 (corresponding to the "ground leveling body" of the present invention), and a hose 25 is connected between the delivery section 22 and the furrow former 24. The center float 17 has a front ground leveling section 17a and a rear ground leveling section 17b that is wider in the left-right direction than the front ground leveling section 17a.

[0040] As the machine body 3 moves forward, fertilizer in the hopper 21 is fed into the hose 25 by the feed section 22, and air from the blower 23 is supplied to the hose 25, and the fertilizer is supplied through the hose 25 to the furrow former 24. As the machine body 3 moves forward, furrows are formed in the rice field surface G (see Figures 4, 5, and 6) by the furrow former 24, and fertilizer is supplied from the furrow former 24 to the furrows in the rice field surface G.

[0041] (Correspondence to the claims regarding the overall configuration of the riding rice transplanter) With the above configuration, the vehicle body 3 is provided with wheels for traveling (front wheels 1 and rear wheels 2) and can travel in rice paddies. The machine is equipped with floats (center float 17 and side floats 18, 19) attached to the rear of the body 3 and placed on the rice field surface G, and is also equipped with working equipment (seedling planting device 5 and fertilizer application device 6) that supplies agricultural materials (seedlings and fertilizer) to the rice field surface G.

[0042] (Configuration for detecting the height from the rice field surface to the seedling planting device) 3 and 6, a round pipe-shaped fulcrum member 41 is attached along the left-right direction to the lower front part of the planting transmission case 14. A support arm 41a is connected to the fulcrum member 41 and extends diagonally downward and rearward from the fulcrum member 41.

[0043] The rear of the center float 17 and the rear of the side floats 18, 19 are attached to the rear of the support arm 41a of the fulcrum member 41 so as to be able to swing up and down around an axis P5 that runs in the left-right direction. As the vehicle body 3 moves forward, the center float 17 and the side floats 18, 19 swing up and down around the axis P5 so as to follow contact with the rice field surface G.

[0044] The center float 17 is provided in the left-right center of the seedling planting device 5. A height sensor 39 is attached to the left-right center of the support frame 13 of the seedling planting device 5 via a lifting link (not shown), as will be described later, and a linking rod 40 is connected between the center float 17 and the height sensor 39. The height sensor 39 detects the height from the paddy field surface G (center float 17) to the seedling planting device 5 (height sensor 39), and the detected value of the height sensor 39 is input to the control device 60.

[0045] (Configuration of setting height from the rice field surface to the seedling planting device) 3 and 6, the fulcrum member 41 is attached to the planting transmission case 14 so as to be rotatable about an axis P4 along the left-right direction. An operating gear 41b is connected to the fulcrum member 41, and a planting depth motor 42 is provided that engages with the operating gear 41b and swings the operating gear 41b about the axis P4.

[0046] A planting depth setting unit 43 (corresponding to the setting unit) is provided near the operating handle 9 (see Figure 1), and the setting value of the planting depth setting unit 43 is input to the control device 60. The planting depth setting unit 43 sets the height (set height A1) from the rice field surface G to the seedling planting device 5 (planting transmission case 14).

[0047] A planting depth sensor 44 is provided to detect the angle of the fulcrum member 41, and the set height A1 is detected based on the detection value of the planting depth sensor 44 (the angle of the fulcrum member 41).The detection value of the planting depth sensor 44 is input to the control device 60.

[0048] When the planting depth of the seedlings is changed to the deeper (shallower) side by the planting depth setting unit 43, the planting depth motor 42 is activated by the control device 60, the fulcrum member 41 (support arm 41a) is operated to the upward (downward) side relative to the seedling planting device 5 (planting transmission case 14), and the set height A1 is set to a lower (higher) value.

[0049] As shown in Figure 1, the rotating case 15 and the planting arm 16 rotate on a fixed trajectory relative to the planting transmission case 14, so by changing the set height A1 as described above, the planting depth of the seedlings by the planting arm 16 is changed to a deeper or shallower side.

[0050] (Configuration of lifting and lowering control of seedling planting device) 6, a lift control unit 61 as software is provided in the control device 60. A control valve 45 is provided which supplies and discharges hydraulic oil to and from the hydraulic cylinder 7 (see FIG. 1) to cause the hydraulic cylinder 7 to expand and contract, and the control valve 45 is operated by the lift control unit 61.

[0051] The lifting control section 61 operates the control valve 45 to extend and retract the hydraulic cylinder 7 and lift the seedling planting device 5 so that the detection value of the height sensor 39 (the height from the rice field surface G to the seedling planting device 5 (height sensor 39)) becomes the set height B1. As a result, the seedling planting device 5 (planting transmission case 14) is maintained at the set height A1 above the rice field surface G.

[0052] As mentioned above, the height sensor 39 is attached to the support frame 13 of the seedling planting device 5 via a lifting link, and a linking member (not shown) is connected between the operating gear 41b of the fulcrum member 41 and the lifting link.

[0053] When the planting depth setting unit 43 is operated and the fulcrum member 41 (support arm 41a) is operated to the rising side (lowering side), this movement is transmitted to the lifting link via the linking member, and the lifting link is operated to the rising side (lowering side). As a result, even if the planting depth setting unit 43 is operated and the set height A1 is changed, the height from the center float 17 to the seedling planting device 5 (height sensor 39) remains constant.

[0054] In other words, when the set height A1 is changed by the planting depth setting unit 43, the height of the planting transmission case 14 is changed relative to the center float 17 and the height sensor 39. Regardless of whether the set height A1 is changed by the planting depth setting unit 43, the lifting control unit 61 raises and lowers the seedling planting device 5 so that the detection value of the height sensor 39 becomes the set height B1.

[0055] By maintaining the detection value of the height sensor 39 at the set height B1, the seedling planting device 5 (planting transmission case 14) is maintained at the set height A1 set by the planting depth setting unit 43, and the seedling planting depth by the planting arm 16 is maintained at a depth corresponding to the set height A1.

[0056] (Correspondence to claims regarding the lifting control of seedling planting equipment) With the above-described configuration, the float is a center float 17 attached to the left-right center of the working device (seedling planting device 5) so as to be able to rise and fall relative to the working device (seedling planting device 5).

[0057] A height sensor 39 is provided that detects the height from the center float 17 to the working device (seedling planting device 5) as the height from the paddy field surface G to the working device (seedling planting device 5). A setting unit (planting depth setting unit 43) is provided that can set and change the set heights A1, B1 from the rice field surface G to the working device (seedling planting device 5). An elevation control section 61 is provided which raises and lowers the working device (seedling planting device 5) relative to the machine body 3 so that the detected value of the height sensor 39 becomes the set heights A1 and B1.

[0058] (Configuration of ground leveling rotor) 2, 3, and 4, the soil leveling rotor 30 (an example of the soil leveling unit of the present invention) is attached to the seedling planting device 5 so as to be positioned in front of the seedling planting device 5, and is disposed behind the rear wheels 2. The soil leveling rotor 30 has a transmission case 27, a support frame 28, a drive shaft 29 (corresponding to the "drive shaft portion" of the present invention), a soil leveling rotor 33 (corresponding to the "blade portion" of the present invention), a support frame 34, a cover 35, and spacers 46, 47, and 48 having a smaller diameter than the rotor. Note that in the present invention, the soil leveling rotor 30, center float 17, and side floats 18 and 19 may all be treated as the soil leveling unit.

[0059] The support case 36 is connected to the planting transmission case 14 at the left end, and the support bracket 38 is connected to the right end of the support frame 13. The transmission case 27 is attached to the support case 36 so as to be swingable up and down about an axis P1 (corresponding to the first fulcrum axis) along the left-right direction, and extends diagonally forward and downward. The support frame 28 is attached to the support bracket 38 so as to be swingable up and down about the axis P1, and extends diagonally forward and downward.

[0060] A drive shaft 29 is attached to the transmission case 27 and the support frame 28 so as to be rotatable about an axis P3 extending in the left-right direction. Rotating bodies 31 and 32 and spacers 46, 47, and 48 are attached to the drive shaft 29 so as to be positioned in front of the center float 17. A rotating body 33 is attached to the right and left portions of the drive shaft 29 so as to be positioned in front of the side floats 18 and 19.

[0061] A support frame 34 is connected across the transmission case 27 and the support frame 28. A sheet metal cover 35 is connected to the support frame 34 and is provided behind the rotors 31, 32, and 33.

[0062] The power transmitted to the planting transmission case 14 at the left end is transmitted from the transmission shaft (not shown) inside the support case 36 to the transmission mechanism (not shown) inside the transmission case 27, and then to the drive shaft 29, causing the drive shaft 29 and rotating bodies 31, 32, and 33 to rotate counterclockwise in Figures 4 and 6.

[0063] As the rotors 31, 32, and 33 are driven to rotate, the rotors 31, 32, and 33 level the rice field surface G, and mud thrown backward from the rotors 31, 32, and 33 is stopped by the cover 35.

[0064] (Configuration of lifting and lowering of ground leveling rotor) 2, 3, and 4, a support frame 49 is connected to the support frame 13 and extends upward. A fan-shaped lift gear 50 is attached to the support frame 49 so as to be able to swing up and down about an axis P6 that extends in the left-right direction. An elevator motor 51 is attached to the support frame 49 and engages with the lift gear 50 to swing the lift gear 50 about the axis P6.

[0065] In the soil leveling rotor 30, an arm 47a is provided on the spacer 47, and the arm 47a is connected to a lifting gear 50. The lifting gear 50 is swung up and down around the axis P6 by a lifting motor 51, thereby changing the height of the soil leveling rotor 30 relative to the seedling planting device 5.

[0066] As shown in Figure 6, a grading depth setting unit 52 is provided near the control handle 9 (see Figure 1), and the setting value of the grading depth setting unit 52 is input to the control device 60. The grading depth setting unit 52 sets the height from the rice field surface G to the grading rotor 30 (grading set height A2).

[0067] A ground leveling height sensor 53 is provided to detect the angle of the lifting gear 50 relative to the support frame 49. The height of the ground leveling rotor 30 relative to the seedling planting device 5 is detected based on the angle of the lifting gear 50 relative to the support frame 49, and the detection value of the ground leveling height sensor 53 is input to the control device 60.

[0068] As described above, when the lifting control unit 61 maintains the seedling planting device 5 at a set height A1 above the rice field surface G, the height of the soil leveling rotor 30 relative to the rice field surface G is detected by the detection value of the planting depth sensor 44 and the detection value of the soil leveling height sensor 53.

[0069] The lifting control unit 61 maintains the seedling planting device 5 (planting transmission case 14) at the set height A1. Even if the set height A1 is changed by the planting depth setting unit 43, the height of the soil leveling rotor 30 relative to the paddy field surface G is detected by the detection value of the planting depth sensor 44 and the detection value of the soil leveling height sensor 53.

[0070] The control device 60 is provided with a ground leveling lifting control unit 62 (corresponding to a height changing unit) as software. In the above-mentioned state, the soil leveling lifting control unit 62 operates the lifting motor 51 so that the height of the soil leveling rotor 30 relative to the rice field surface G becomes the soil leveling set height A2 set by the soil leveling depth setting unit 52. As a result, the soil leveling depth of the soil leveling rotor 30 is maintained at a depth corresponding to the soil leveling set height A2.

[0071] (Correspondence to claims regarding ground leveling rotors) With the above configuration, a ground leveling rotor 30 is provided which is provided in front of the working device (seedling planting device 5), is attached to the working device (seedling planting device 5) so that its height can be changed, and is driven to rotate around an axis P3 along the left-right direction, thereby coming into contact with the rice field surface G and leveling the rice field surface G.

[0072] The ground leveling rotor 30 is attached to the work device (seedling planting device 5) so that it can swing up and down around a first fulcrum axis (axis P1) that runs in the left-right direction, and is thereby attached so that its height can be changed relative to the work device (seedling planting device 5). The ground leveling rotor 30 is rotationally driven so that the portion that reaches the upper side of the axis P3 passes the front side of the axis P3 and moves downward.

[0073] A height change unit (land leveling lifting control unit 62) is provided which changes the height of the land leveling rotor 30 relative to the work device (seedling planting device 5) based on the change in the set height A1 by the setting unit (planting depth setting unit 43) so that the land leveling rotor 30 is maintained at the land leveling set height A2 which was previously set relative to the rice field surface G.

[0074] (Configuration of impurity guide member) 2 to 5, a debris guide member 54 (corresponding to the "land leveling body protection member" of the present invention) is attached to the land leveling rotor 30. The debris guide member 54 has a main body portion 55 (corresponding to the "guide portion" of the present invention) and a horizontal frame 56.

[0075] The main body 55 is formed by bending a flat plate material into an angle, and has a right section 55a and a left section 55b. A horizontal frame 56 is connected in the left-right direction between the rear of the right section 55a and the rear of the left section 55b of the main body 55, and the main body 55 and the horizontal frame 56 form a symmetrical triangular shape in a plan view.

[0076] A plurality of recessed (cutout-shaped) muddy water drainage sections 55c (corresponding to the "dividers" of the present invention) that are open downward are provided on the right section 55a and the left section 55b of the main body 55. A cutout section 55d is provided at the top of the connecting portion of the right section 55a and the left section 55b of the main body 55, and a bracket 55e is attached to the cutout section 55d.

[0077] In the ground leveling rotor 30, a bracket 57 is connected to a portion of the support frame 34 above the spacer 47 and extends forward. A bracket 58 is connected to a portion of the support frame 34 above the spacer 48 and extends forward.

[0078] In the impurity guide member 54, the rear portions of the right and left portions 55a, 55b of the main body 55 are attached to brackets 57, 58 so as to be swingable up and down around an axis P2 (corresponding to the second fulcrum axis) along the left-right direction.

[0079] The connecting member 59 is connected between the bracket 13a of the support frame 13 of the seedling planting device 5 and the bracket 55e of the impurity guide member 54 (main body 55), and the posture of the impurity guide member 54 around the axis P2 is set by the connecting member 59.

[0080] (Arrangement of impurity guide members) - 1 As shown in Figures 2 to 5, the debris guide member 54 is attached to the ground leveling rotor 30, extends forward from the ground leveling rotor 30, and is located in front of the center of the left and right sides of the ground leveling rotor 30, and is located in front of the center float 17.

[0081] In a plan view, the right portion 55a (left portion 55b) of the impurity guide member 54 (main body portion 55) extends diagonally rearward to the right (diagonally rearward to the left) from the connection between the front end portion 55f of the right portion 55a and the front end portion 55g of the left portion 55b of the impurity guide member 54 (main body portion 55).

[0082] The spacer 48 (spacer 47) (corresponding to the "small diameter portion" of the present invention) of the ground leveling rotor 30 is located behind the rear end 55h (right end) of the right portion 55a and the rear end 55i (left end) of the left portion 55b of the debris guide member 54 (main body portion 55), and is located between the center float 17 and the right (left) side float 18. In other words, the left and right end points of the main body portion 55 (rear end 55h and rear end 55i) are located at the left-right positions where the spacers 48 and 47 are located. In addition, the left and right ends of the main body portion (rear end 55h and rear end 55i) are located outside the front ground leveling portion 17a of the center float 17 on the left and right sides. However, if the connecting portion from the front ground leveling portion 17a to the rear ground leveling portion 17b of the center float 17 is smoothly configured, the seam between the front ground leveling portion 17a and the connecting portion may not be clearly identified. In such a case, instead of the rear end portions 55h, 55i, brackets 57, 58 may be positioned on the left and right outer sides of the front leveling portion as the left and right end points of the main body portion 55.

[0083] As the machine body 3 moves forward, the impurities on the rice field surface G in front of the center float 17 are guided laterally to the right by the right part 55a of the impurity guide member 54 (main body 55), and are guided laterally to the left by the left part 55b of the impurity guide member 54 (main body 55). Mud and water on the rice field surface G flow rearward through the muddy water drainage part 55c (corresponding to the "partition part" of the present invention) of the impurity guide member 54 (main body 55), then flow into the soil leveling rotor 30 (rotating bodies 31, 32), and then into the center float 17.

[0084] The impurities guided laterally to the right (left) by the right part 55a (left part 55b) of the impurity guide member 54 (main body part 55) pass through the spacer 48 (spacer 47) of the soil leveling rotor 30 and pass between the center float 17 and the right (left) side float 18. The impurities that do not pass through the spacer 48 (spacer 47) of the soil leveling rotor 30 are pushed downward from the rice field surface G by the rotating bodies 31, 32, 33 of the soil leveling rotor 30.

[0085] The cutout 55d of the debris guide member 54 (main body 55) and the spacer 46 of the soil leveling rotor 30 are located directly below the transmission shaft 26 (see Figure 1). When the seedling planting device 5 is operated to rise significantly above the rice field surface G, such as when turning at the edge of the levee, the transmission shaft 26 is located in the cutout 55d of the debris guide member 54 (main body 55) and the spacer 46 of the soil leveling rotor 30, so the transmission shaft 26 does not interfere with the debris guide member 54 and the soil leveling rotor 30.

[0086] (Arrangement of impurity guide members) - 2 As shown in Figure 6, by maintaining the soil leveling rotor 30 at the soil leveling set height A2, the impurity guide member 54 attached to the soil leveling rotor 30 is also maintained at a height where it comes into contact with the rice field surface G. When the soil leveling set height A2 is changed by the soil leveling depth setting unit 52 and the height of the soil leveling rotor 30 relative to the seedling planting device 5 is changed, the soil leveling rotor 30 is swung up and down around the axis P1.

[0087] In contrast, as shown in Figures 4 and 6, when viewed from the side, a four-link is formed by the axis P1, the axis P2, the connection point between the linking member 59 and the bracket 13a of the support frame 13, and the connection point between the linking member 59 and the bracket 55e of the impurity guide member 54 (main body 55).

[0088] As a result, even if the soil leveling rotor 30 is swung up and down around the axis P1, the aforementioned four-link connecting member 59 maintains the impurity guide member 54 in a position that is approximately parallel to the rice field surface G when viewed from the side.

[0089] (Correspondence to claims regarding impurity guide members) With the above configuration, an impurity guide member 54 is provided in front of the float (center float 17) and guides impurities on the rice field surface G in front of the float (center float 17) to the side of the float (center float 17) as the machine body 3 moves forward.

[0090] The impurity guide member 54 has a right portion 55a that guides impurities on the rice field surface G in front of the float (center float 17) to the right of the float (center float 17), and a left portion 55b that guides impurities on the rice field surface G in front of the float (center float 17) to the left of the float (center float 17). The front end of the right portion 55a and the front end of the left portion 55b are connected. In a plan view, the right portion 55a extends diagonally rearward to the right from the connecting portion between the front end of the right portion 55a and the front end of the left portion 55b, and the left portion 55b extends diagonally rearward to the left from the connecting portion between the front end of the right portion 55a and the front end of the left portion 55b.

[0091] The debris guide member 54 has a horizontal frame 56 that is connected along the left-right direction across a right portion 55a and a left portion 55b. The impurity guide member 54 has a muddy water draining portion 55c that allows mud and water from the rice field surface G to pass rearward as the machine body 3 moves forward.

[0092] The debris guide member 54 is attached to the ground leveling rotor 30. The debris guide member 54 is provided on the front side of the ground leveling rotor 30. The debris guide member 54 is attached to the ground leveling rotor 30 so that it can swing up and down around a second fulcrum axis (axis P2) along the left-right direction, and is provided in front of the ground leveling rotor 30 by extending forward from the ground leveling rotor 30.

[0093] A linking member 59 is provided which is connected between the impurity guide member 54 and the working device (seedling planting device 5) and changes the position of the impurity guide member 54 relative to the soil leveling rotor 30 so that the impurity guide member 54 is maintained in a position along the rice field surface G based on a change in the height of the soil leveling rotor 30 relative to the working device (seedling planting device 5) by the height change unit (soil leveling lifting control unit 62).

[0094] (First Alternative Embodiment of the Invention) In addition to the impurity guide member 54 being provided in front of the center float 17, the impurity guide member 54 may be provided in front of the side floats 18, 19. When the impurity guide member 54 is provided in front of the side floats 18, 19, the impurity guide member 54 may not be triangular in plan view, but may be formed in a straight line extending diagonally rear right (diagonally rear left) in plan view.

[0095] (Second Alternative Embodiment of the Invention) A debris guide member 54 may be provided between the ground leveling rotor 30 and the center float 17 and the side floats 18, 19.

[0096] (Third Alternative Embodiment of the Invention) The ground leveling rotor 30 may be eliminated. According to this configuration, the debris guide member 54 may be attached to the front of the center float 17 and the front of the side floats 18 and 19.

[0097] (Fourth Alternative Embodiment of the Invention) In the above embodiment, the main body 55 is made of a flat metal plate bent at an angle, but it may also be made of an elastic material such as rubber. This prevents excessive deformation of soft fields. It is also possible to combine multiple materials with different elasticities in the front and rear depending on the type of impurities.

[0098] (Fifth Alternative Embodiment of the Invention) In the above embodiment, the dirt guide member 54 that prevents or reduces dirt from reaching the dirt has been described as an example of a dirt-leveling body protection member, but it is not limited to this. For example, the dirt-leveling body protection member may be provided with an obstacle contact detection sensor (an example of an obstacle detection unit) that detects contact with a large obstacle such as a stone or a lump of mud, emits a danger detection signal, and automatically slows down, stops, or takes evasive action on the machine, or notifies the operator to take these actions. [Industrial Applicability]

[0099] The present invention can be applied not only to riding rice transplanters, but also to unmanned, automatically traveling rice transplanters, radio-controlled rice transplanters, and riding direct seeding machines equipped with a sowing device (corresponding to a working device) that supplies seeds (corresponding to agricultural materials) to the paddy field G. It can also be applied to other field working machines that perform ground work in fields other than paddy fields. [Explanation of symbols]

[0100] 1 Front wheel (wheel) 2 Rear wheels (wheels) 3 aircraft 5 Seedling planting device (work device) 17 Center float (float) (leveling body) 18 Side float (float) (leveling body) 19 Side float (float) (leveling body) 30 Leveling rotor (leveling body) 39 Height Sensor 43 Planting depth setting unit (setting unit) 54 Impurity guide member (ground leveling body protection member) 55a right side 55b Left 55c Muddy water drain 56 Horizontal frame 59 Connecting members 61 Lift control section 62 Leveling lift control unit (height change unit) A1 Setting height A2 Leveling setting height B1 Setting height P1 axis (first fulcrum axis) P2 axis (second fulcrum axis) P3 axis center G Tanabe

Claims

1. a machine body provided with wheels for running and capable of running in a field; a work device attached to the rear of the machine body, having a ground leveling body for leveling the field, and performing ground work on the field; A field work machine comprising a ground leveling body protection member that is provided in front of the ground leveling body and protects the ground leveling body from the front.

2. A field work machine as described in claim 1, wherein the front end of the right part of the ground leveling body protection member and the front end of the left part of the ground leveling body protection member are connected, and the right part extends diagonally rearward to the right in a plan view from the connecting portion between the front end of the right part and the front end of the left part, and the left part extends diagonally rearward to the left in a plan view from the connecting portion between the front end of the right part and the front end of the left part.

3. The ground leveling body protection member is 3. The field work machine according to claim 2, further comprising a horizontal frame that is connected along the left-right direction across the right portion and the left portion.

4. The ground leveling body protection member is 2. The field work machine according to claim 1, further comprising a partition section that allows at least one of mud and water in the field to pass rearward as the machine body moves forward.

5. The leveling body is a ground leveling rotor provided across the left and right direction of the work device; a float group in which a plurality of floats are arranged side by side; The center float provided in the center of the float group has a front leveling portion and a rear leveling portion that is wider in the left-right direction than the front leveling portion, The ground leveling body protection member has a guide portion extending to the left and right rear, The field work machine according to claim 1 , wherein the left and right end points of the guide section are located outside the front ground leveling section on the left and right.

6. a height sensor that detects the height from the center float to the working device as the height from the rice field surface to the working device; a setting unit that can set and change the set height from the rice field surface to the working device; The field work machine according to claim 5, further comprising a lifting control section that raises and lowers the work implement relative to the machine body so that the detected value of the height sensor becomes the set height.

7. The ground leveling rotor is attached to the work device so as to be swingable up and down, and is attached so as to be able to change the height relative to the work device by a height changing unit, The ground leveling body protection member is attached to the ground leveling rotor so as to be swingable up and down, A field work machine as described in claim 6, which is provided with a linking member that is connected between the leveling body protection member and the work device and that changes the position of the leveling body protection member relative to the leveling rotor so that the leveling body protection member is maintained in a position that is in line with the field scene based on a change in the height of the leveling rotor relative to the work device by a height change unit.

8. The ground leveling rotor has a large diameter blade portion and a small diameter portion, The field work machine according to claim 7 , wherein the left and right end points of the guide portion are located at the same left-right position as the small diameter portion.

9. 9. The field work machine according to claim 1, wherein the soil leveling body protection member is provided with an obstacle detection unit that outputs a detection signal when the soil leveling body protection member comes into contact with an obstacle at a predetermined level or more.

Images