Farm work machine

Abstract

To provide a farm work machine that enables leveling of a field surface to be easily performed even by a worker who is not a skilled person, and enables earthing up work even at dark time such as evening and night.SOLUTION: Provided is a farm work machine including a leveling plate that is connected to a travel vehicle body including lifting means and can be lifted up and down by the lifting means. The farm work machine includes water level position detection means and causes the farm work machine to be lifted up and down on the basis of a detection result of the water level position detection means.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an agricultural machine having a ground leveling plate for leveling the surface of a farm field (the muddy surface of a paddy field). [Background technology]

[0002] Conventionally, there has been known an agricultural machine that uses a leveller attached to the rear of the tiller to smooth out unevenness on the surface of a field and level it (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-187364 A Summary of the Invention [Problem to be solved by the invention]

[0004] With conventional agricultural machinery, there is no guideline for the height at which to level the field surface, so workers perform soil piling work by manipulating the tractor's position (adjusting the height of the agricultural machinery by operating a three-point linkage) based on visual inspection and feel. For this reason, leveling the height of the field surface is a task that requires great skill, and there is a problem in that only experienced workers can level the field surface.

[0005] In addition, there is only a short period between flooding a rice paddy and planting, and tasks such as piling up and plowing must be completed within this short period. However, it is difficult to secure time to do this work due to factors such as the weather and the convenience of workers (especially part-time farmers). Another issue is that piling up work cannot be carried out during dark times such as the evening or night, when it is not possible to visually check the progress of the work.

[0006] Therefore, an object of the present invention is to provide an agricultural work machine that solves the above problems, enables even an unskilled operator to easily level the field surface, and enables soil piling work to be performed even during dark times such as in the evening or at night. [Means for solving the problem]

[0007] In order to solve such problems, the present invention has the following configuration. An agricultural work machine having a leveling plate that is connected to a traveling vehicle body having a lifting means and can be raised and lowered by the lifting means, A water surface position detection means is provided, An agricultural working machine characterized in that the agricultural working machine is raised and lowered based on the detection result of the water surface position detection means. Effect of the Invention

[0008] It is possible to provide an agricultural working machine that can maintain the leveling board at a constant position relative to the water surface by raising and lowering the agricultural working machine based on the detection results of the water surface position detection means, regardless of the unevenness of the field surface. [Brief description of the drawings]

[0009] [Figure 1] 1A and 1B are a cross-sectional view and a rear view of a halo 1 according to an embodiment of the present invention. [Diagram 2] 1A and 1B are views of a halo 1 according to an embodiment of the present invention as seen from the right and from the front. [Diagram 3] 1A and 1B are views of the halo 1 of the first modified example of the present invention as seen from the right and from the front. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Embodiment] Hereinafter, a halo 1 according to an embodiment of the present invention will be described with reference to the drawings. The agricultural machine is not limited to a harrow, but may be another agricultural machine, such as a rotary tiller. In the following description, the same reference numerals in different drawings indicate parts having the same functions, and duplicated descriptions in each drawing will be omitted as appropriate. For the sake of convenience, terms indicating directions such as up, down, front, rear, right, and left are used, but the direction in which gravity acts is down, and the opposite is up. The direction in which the traveling vehicle moves is forward, and the opposite is rear. Furthermore, when facing forward, the right side is right, and the left side is left.

[0011] [Halo overall composition] FIG. 1 shows a halo 1 according to an embodiment of the present invention, with (a) and (b) being cross-sectional views taken along line AA as viewed from the right and (b) being viewed from the rear. FIG. 2 shows the halo 1 according to the embodiment of the present invention, (a) viewed from the right and (b) viewed from the front.

[0012] As shown in FIGS. 1 and 2, the harrow 1 in this embodiment is an agricultural work machine used for tilling work and the like, and is equipped with a mounting part 11, a frame structure 12, and a working part 13. The harrow 1 is connected to a traveling vehicle body (not shown) such as a tractor by a mounting part 11. A frame structure 12 and a working part 13 are connected to the mounting part 11. As a result, the harrow 1 is towed as the traveling vehicle body travels, and the working part 13 performs work such as plowing.

[0013] The harrow 1 of this embodiment has a width (width in the left-right direction) that is slightly wider than the width of the running body, but it may also be possible to connect a working section that is foldable (openable and closable) on the central side to at least one of the left and right sides, making it possible to perform work over a width significantly wider than the width of the running body.

[0014] [Installation part] The mounting unit 11 is connected to a three-point link (lifting means: not shown) provided at the rear of the traveling vehicle body. The three-point link is usually composed of a top link, a lift rod, a lower link, etc. The three-point link is a well-known mechanism, so a detailed description will be omitted. The mounting portion 11 has a top link connecting portion 111 that is connected to the top link, a lower link connecting portion 112 that is connected to the lower link, and an attachment portion 113. The mounting portion 113 includes a top mast 113C having a top link connecting portion 111, and a hitch bracket including a left mounting portion 113L and a right mounting portion 113R. The halo 1 can be raised and lowered by a three-point link via the mounting part 11.

[0015] [Frame structure] The frame structure 12 includes a frame 121 , a gear box 122 , and a support 123 . The frame 121 is attached to the attachment portion 113 of the mounting portion 11 , and supports the working portion 13 via a support portion 123 . The frame 121 has a left frame 121L and a right frame 121R, to which a left attachment portion 113L and a right attachment portion 113R of the mounting portion 11 are fixed, respectively. The left frame 121L and the right frame 121R are both cylindrical in shape, and a power transmission shaft that transmits power from the gear box 122 can be housed inside.

[0016] The gear box 122 is disposed in the center of the frame 121, i.e., between the right frame 121R and the left frame 121L, and has the top mast 113C fixed thereto. A bevel gear can be housed inside the gear box 122. The support part 123 is a member that connects the frame 121 and the working part 13, and has a left support part 123L and a right support part 123R fixed to the outer end parts of the left frame 121L and the right frame 121R, respectively, and is connected to the side panel 133 of the working part 13 to support the working part 13. The left support portion 123L also serves as a chain case capable of storing a chain therein.

[0017] The frame structure 12 houses the following power transmission means for transmitting power from the traveling vehicle body to the working unit 13. The gear box 122 has an input shaft 1221, and power is transmitted to the input shaft 1221 from a PTO shaft (not shown) of the traveling vehicle body via a universal joint (not shown). In addition, in the pile-up state described later, the power of the traveling vehicle body is not transmitted to the input shaft 1221. The power of the input shaft 1221 is transmitted by a bevel gear (not shown) in the gear box 122 to a power transmission shaft (not shown) in the left frame 121L. The power of the power transmission shaft in the left frame 121L is transmitted to the rotating shaft 1312 of the working unit 13 by a chain (not shown) in the left support part 123L. In this embodiment, power is transmitted from the gear box 122 to the working unit 13 via power transmission means in the left frame 121L and the left support part 123L, but power may also be transmitted from the gear box 122 to the working unit 13 via power transmission means in the right frame 121R and the right support part 123R.

[0018] [Working section] The working section 13 has a working rotor 131 , a shield cover 132 , a side plate 133 , an apron 134 , a rake 135 , a leveller 136 (ground levelling plate), and an extension leveller 137 . The work rotor 131 has a work claw 1311 for plowing, and a rotation shaft 1312 to which the work claw 1311 is fixed. In the work rotor 131, power is transmitted from the input shaft 1221 to the rotary shaft 1312, which rotates. As the rotary shaft 1312 rotates, the work claws 1311 rotate, thereby performing a tilling operation.

[0019] The work rotor 131 is covered at its upper part by a shield cover 132, at its sides by side plates 133, and at its rear by an apron . The side plate 133 includes a left plate 133L and a right plate 133R, which are fixedly supported by a left support portion 123L and a right support portion 123R, respectively. The work rotor 131 (rotating shaft 1312) and the shield cover 132 are suspended between the left side plate 133L and the right side plate 133R.

[0020] The apron 134 is pivotally supported at the rear end of the shield cover 132 so as to be rotatable in the vertical direction. A pressure adjusting device 1341 capable of adjusting the pressure of the apron 134 is disposed between the shield cover 132 and the apron 134 in the center in the left-right direction of the apron 134 . The apron 134 presses against the field surface FS behind the work rotor 131, thereby performing functions such as crushing the soil in the field, leveling the field surface FS, and incorporating straw and the like into the soil of the field. A rake 135 is attached to the inner surface of the apron 134. The rake 135 is located behind the work rotor 131 and performs the functions of crushing the soil in the field and incorporating straw and the like into the soil in addition to the functions of the apron 134. In addition, the pressure adjustment device 1341 of the apron 134 can adjust the pressure force, and can also be configured to switch the pressure on and off. Furthermore, the adjustment of the pressure force and the on / off of the pressure may be remotely controlled using a motor or the like.

[0021] The leveller 136 is pivotally supported at the rear end of the apron 134 so as to be rotatable in the vertical direction. An understopper 1361 is interposed between the left-right center of the leveller 136 and the mounting part 11. The understopper 1361 can adjust the angle of the leveller 136 and can switch between a pile-up state and a pile-up release state (puddling state). An operating lever 1362 is attached to the upper end of the under stopper 1361, and an operator (such as an operator of the traveling vehicle body) can switch between an earth-pile state and an earth-pile release state. In the pile-up state, the under stopper 1361 is fixed to the mounting part, thereby restricting the vertical rotation of the leveller 136, and in the pile-up release state (plowing state), the under stopper 1361 is released from its fixing to the mounting part, thereby not restricting the vertical rotation of the leveller 136. In addition, in the soil piling state, the under stopper 1361 is fixed to the mounting portion, and the vertical rotation of the leveller 136 is restricted, so that the vertical rotation of the apron 134 is also restricted. In the soil piling state, the work is performed before the plowing work, with the field filled with water, and the work is to level the field surface FS by leveling the height difference. During the soil piling work, the leveler 136 is fixed to the mounting part 11 by the under stopper 1361 etc., and the field surface FS is leveled to a height corresponding to the height of the lower end of the leveler 136. The switching between the pile-up state and the pile-up release state may be performed by remote control using a motor or the like. 1 to 3 all show the state in which the leveller 136 is switched to the pile-up state.

[0022] An extension leveller 137 is pivotally supported on both left and right ends of the leveller 136 so as to be rotatable. The extension levellers 137 include a left extension leveller 137L and a right extension leveller 137R, which are pivotally supported on the left and right ends of the leveller 136 so as to be independently rotatable. The left extension leveller 137L and the right extension leveller 137R can each be fixed independently in two states: a state in which they are folded onto the leveller 136, and a state in which they are spread out to the side of the leveller 136. The extension leveller 137 is used to pull soil and muddy water on the side of the working section 13 inward during plowing work, and to level the field surface FS on the side of the working section 13. In addition, when carrying out soil piling work, the extension leveller 137 is folded up and the work is carried out. In this embodiment, the extension leveller 137 is folded and unfolded manually, but may be remotely operated using a motor or the like.

[0023] In this embodiment, the harrow 1 is used, but it is also possible to perform tilling and soil piling work using a rotary tiller. In this case, the apron of the rotary tiller is used as a ground leveling plate.

[0024] [Lifting and lowering of work section] The running body is equipped with a three-point linkage (not shown) which is a lifting means for raising and lowering the agricultural work machine in conjunction with the upward and downward rotation of the apron 134 in order to adjust the height of the working part 13 and thereby the tilling depth. As shown in Fig. 1, the harrow 1 has a lifting operation lever 3 that operates a lifting operation rod 2 (a member that operates the lifting means) that controls the lifting and lowering of the three-point link of the traveling body during tilling work. The lifting operation lever 3 is rotatably attached to the right attachment part 113R, and engages with the lifting operation rod 2 in a freely detachable manner. The harrow 1 also has a link mechanism 4 that transmits the vertical rotation of the apron 134 to the lifting / lowering operation lever 3 and connects the apron 134 and the lifting / lowering operation lever 3. The link mechanism 4 has an apron attachment 41 attached to the apron 134, a central rotating member 43 rotatably attached to the shield cover 132, a first rod 42 rotatably attached to the apron attachment 41 and the central rotating member 43, and a second rod 44 rotatably attached to the central rotating member 43 and the lifting / lowering operation lever 3. The second rod 44 is releasably connected to the lifting / lowering operation lever 3, so that the link mechanism 4 is releasably connected to the lifting / lowering operation lever 3. Note that the link mechanism 4 is not an essential component of the harrow 1, and therefore the link mechanism 4 may not be provided. The lifting operation rod 2 is pushed and pulled via the lifting operation lever 3 to switch a switching valve of a hydraulic cylinder (not shown) that lifts and lowers the three-point link, thereby expanding and contracting the hydraulic cylinder, lifting and lowering the three-point link, and adjusting the vertical position of the harrow 1. The lifting operation lever 3 is biased in a direction that pushes the lifting operation rod 2 (counterclockwise when viewed from the right) by a biasing means (torsion spring, coil spring, etc.: not shown). The mechanism for lifting and lowering the agricultural work machine in conjunction with the up-and-down rotation of the apron 134 may be any means capable of transmitting the rotation of the apron 134 to the lifting operation rod 2, and may be a link mechanism or any other means such as a wire. Also, a sensor (for example, a rotational position detection sensor such as a potentiometer or rotary encoder) that detects the rotational position of the apron 134 may be provided, and a communication cable may be used to transmit the output of this sensor to the traveling vehicle body.

[0025] The traveling vehicle body is capable of performing working unit lifting control to adjust the height of the working unit 13. When the apron 134 rotates up and down following the field surface FS, the lift operation lever 3 rotates via the link mechanism 4 to push and pull the lift operation rod 2 . When the field surface FS becomes higher relative to the harrow 1 and the apron 134 rotates upward, it pushes the lifting operation rod 2. This activates the hydraulic cylinder that raises and lowers the three-point link, and the harrow 1 rotates upward. Conversely, when the field surface FS becomes lower and the apron 134 rotates downward, it pulls the lifting operation rod 2. This activates the hydraulic cylinder that raises and lowers the three-point link, and the harrow 1 rotates downward. In this way, the height of the field surface FS is detected based on the position of the apron 134, and the up and down position of the harrow 1 is controlled so that the apron 134 is adjusted to a predetermined rotation position during work, and as a result, the height of the working part 13 (work rotor 131) is kept approximately constant.

[0026] Furthermore, in the harrow 1 of this embodiment, when in a pile-up state, the height of the leveller 136 can be adjusted by operating the raising and lowering of the three-point link of the running body to adjust the up and down position of the harrow 1, thereby levelling the field surface FS to a constant height. The height of the leveller 136 is adjusted based on the water surface WS, which is kept horizontal. Specifically, the harrow 1 controls the vertical position of the harrow 1 by operating the elevation of the three-point link of the traveling body so that the height of the lower end of the leveller 136 is in a specified positional relationship (a fixed distance) with respect to the position of the water surface WS. In addition, an extension leveller 137 may be used during soil piling work.

[0027] The water surface position detection means 6 is attached to the right side plate 133R of the working unit 13. As shown in Figure 2 etc., the water surface position detection means 6 has a support shaft 61 rotatably mounted on the front portion of the right side plate 133R, a support rod 62 (rod-shaped member) having an upper end fixed to the support shaft 61, and a float 63 attached to the lower end of the support rod 62. The support shaft 61, the support rod 62 and the float 63 rotate together. The support shaft 61 (its rotation axis) is provided parallel to the rotation axis 1312 of the working unit 13. The float 63 is attached facing rearward to the lower end of the support rod 62, and when the running body and harrow 1 are running, the float 63 rotates within a range rearward from a vertically downward position from the support shaft 61 (see dashed lines in Figures 2(a) and 3(a)). The float 63 is a hollow member made of resin or the like, with a curved bulge on the side that comes into contact with the water surface WS, allowing it to float on the water surface WS and smoothly follow the position of the water surface WS. In order to adjust the height of the float 63 relative to the harrow 1, the support rod 62 may be provided with a plurality of mounting holes, and the mounting position of the support rod 62 relative to the support shaft 61 may be adjusted, or the mounting position of the float 63 relative to the support rod 62 may be adjusted. Also, the support rod 62 may be configured with an expandable structure combining two members (for example, a structure in which an inner cylindrical member can slide on an outer cylindrical member), and the length of the support rod 62 may be adjusted. Also, the position at which the float 63 is used is not limited to a position facing vertically downward from the support shaft 61, and may be at any angle.

[0028] As shown in Figure 2, in this embodiment, a wire arm 51, a wire 52, and a torsion spring 53 are provided as a water surface position transmission means 5 for transmitting the rotational position (displacement) of the support shaft 61, which is the detection result of the water surface position detection means 6, to the lifting operation rod 2. The wire arm 51 is fixed to a support shaft 61 and rotates integrally with the support shaft 61, a support rod 62 and a float 63. One end of the wire 52 is attached to the wire arm 51, and the other end is attached to the lift operation lever 3 so as to be freely detachable (see Figs. 1(a) and 2(a)). A torsion spring 53, which is a biasing member for applying tension to the wire 52, is attached between the wire arm 51 and the right side plate 133R. The wire arm 51 is biased by the torsion spring 53 in a counterclockwise direction when viewed from the right. When not piling up soil, the support rod 62 and the float 63 can be fixed in a position (storage position) where they are rotated far backward, and the float 63 can be fixed in a position away from the water surface so as not to impede travel (see the two-dot chain lines in Fig. 2(a) and Fig. 3(a)). The method of fixing the support rod 62 and the float 63 in the storage position can be appropriately selected, such as fixing with a fixing pin or engaging and fixing with a hook. Furthermore, movement to the storage position, fixing, release from the storage position, movement to the use position, etc. may be performed manually or by a driving means. The mechanism for transmitting the up and down movement of the float 63 to the lift operation lever 3 may be any other means such as a link mechanism, in addition to the wire.

[0029] When the position of the water surface WS relative to the harrow 1 changes, the lifting operation lever 3 rotates via the float 63, the support rod 62, the support shaft 61, the wire arm 51 and the wire 52. As described above, by rotating the lifting / lowering control lever 3, the three-point link is raised and lowered, and the vertical position of the harrow 1 is adjusted. When the position of the water surface WS relative to the harrow 1 becomes higher, that is, when the distance between the lower end of the leveller 136 and the water surface WS becomes long and the lower end of the leveller 136 is deeply submerged relative to the water surface WS, the float 63 rotates upward, the wire arm 51 rotates backward, and the wire 52 becomes slack. Then, the action of the biasing means pushes the lift operation rod 2 via the lift operation lever 3, and the hydraulic cylinder that raises and lowers the three-point link is activated. As a result, the harrow 1 rotates upward, and the height of the leveller 136 relative to the traveling vehicle body becomes higher. That is, the lower end position of the leveller 136 rises, and the distance between the lower end of the leveller 136 and the water surface WS becomes shorter (shallower). As the lower end position of the leveller 136 rises, the float 63 rotates downward and the wire arm 51 rotates forward, so that the wire 52 is pulled and the force with which the lift operation lever 3 presses the lift operation rod 2 becomes weaker. When the distance between the lower end of the leveller 136 and the water surface WS is adjusted to a predetermined distance and the wire arm 51 rotates to a predetermined position, the lifting / lowering operation lever 3 causes the lifting / lowering operation rod 2 to be put in a non-operated (non-pushed) state, and the lifting / lowering of the three-point linkage stops.

[0030] Conversely, when the position of the water surface WS becomes lower, that is, when the distance between the lower end of the leveller 136 and the water surface WS becomes short and the lower end of the leveller 136 becomes shallower than the water surface WS, the float 63 rotates downward and pulls the lifting operation rod 2. Then, the hydraulic cylinder that raises and lowers the three-point link is operated, the harrow 1 is rotated downward, and the height of the leveller 136 relative to the traveling vehicle body becomes lower. That is, the lower end position of the leveller 136 descends, and the distance between the lower end of the leveller 136 and the water surface WS becomes longer. As the lower end position of the leveller 136 descends, the float 63 rotates upward and the wire arm 51 rotates backward, so that the wire 52 becomes loose and the force with which the lifting operation lever 3 presses the lifting operation rod 2 becomes stronger. When the distance between the lower end of the leveller 136 and the water surface WS is adjusted to a predetermined distance and the wire arm 51 rotates to a predetermined position, the lifting / lowering operation lever 3 causes the lifting / lowering operation rod 2 to be put in a non-operated (non-pushed) state, and the lifting / lowering of the three-point linkage stops. In this way, in the harrow 1 of this embodiment, when the float 63 changes the rotation angle of the support shaft 61 (or support rod 62) from a predetermined angle and the wire arm 51 moves from a predetermined position, the lifting operation lever 3 rotates to operate the lifting operation rod 2, and the lower end position of the leveller 136 is adjusted to a constant distance from the water surface WS.

[0031] In Figure 1(a), a link mechanism 4 and a wire 52 are attached to the lifting operation lever 3, but in reality, the water surface position detection means 6 is not used during plowing operation, so only the link mechanism 4 is attached to the lifting operation lever 3 and the wire 52 is removed. During soil piling work, the working unit is not elevated or lowered by the vertical rotation of the apron 134, so that only the wire 52 is attached to the elevation control lever 3 and the link mechanism 4 is removed. With this configuration, during tilling work, the movement of the lifting operation lever 3 by the link mechanism 4 is not transmitted to the wire 52, and during piling work, the movement of the lifting operation lever 3 by the wire 52 is not transmitted to the link mechanism 4.

[0032] [Variation 1] FIG. 3 shows the halo 1 of the first modified example of the present invention, (a) viewed from the right and (b) viewed from the front. In the above embodiment, the water surface level detection result by the water surface level detection means 6 is mechanically transmitted to the three-point link lifting device, but it may be transmitted by an electrical signal based on a sensor. Therefore, in this modified example, the water surface position detection result by the water surface position detection means 6 is converted into an electrical signal and input to a control means that controls the traveling vehicle body, including the raising and lowering control of the three-point linkage. The harrow 1 of the present modified example 1 includes agricultural machine control means (not shown) that receives signals from various detection means and controls various control targets. It also includes a rotational position detection means 54 for detecting the rotational position of the spindle 61, which is the water surface position detection result by the water surface position detection means 6, and a communication cable 55 for transmitting the output signal of the rotational position detection means 54 to the agricultural machine control means.

[0033] The agricultural work machine control means is installed on the traveling vehicle body, receives signals from the various detection means, and is capable of communicating with traveling vehicle body control means (not shown) that controls various control targets. The rotational position detection means 54 is a rotational position detection sensor such as a potentiometer or a rotary encoder attached to the right side plate 133R. The agricultural work machine control means receives a signal from the rotational position detection means 54 and determines whether or not to raise and lower the three-point link based on the rotational position of the spindle 61, and if it is to be raised or lowered, sends a command to the traveling vehicle body control means to raise and lower the three-point link. In this case, a reference position of the spindle 61 at which the three-point link is not raised or lowered is determined in advance, and when the rotational position of the spindle 61 deviates from the reference position by more than a predetermined amount, a command to raise or lower the three-point link so that the spindle 61 is at the predetermined reference position is sent. The traveling vehicle control means, which receives a command from the agricultural work machine control means, controls the switching valve of the hydraulic cylinder that raises and lowers the three-point link to raise and lower the three-point link and adjust the vertical position of the harrow 1. By adjusting the vertical position of the harrow 1, the vertical position of the lower end of the leveller 136 is adjusted to be a constant distance from the water surface WS. The mounting position of the rotational position detector 54 is not limited to the right side plate 133R, but may be anywhere where the rotational position of the support shaft 61 can be detected.

[0034] The rotational position detection means 54 and the communication cable 55 transmit the detection result of the water surface position detection means 6, and therefore constitute the water surface position transmission means 5. In this modified example, the harrow 1 is equipped with an agricultural machine control means and commands the traveling vehicle body control means to raise and lower the three-point link, but this is not limited to the above, and the output from the rotational position detection means 54 may be sent directly to the traveling vehicle body control means, which in turn controls the raising and lowering of the three-point link.

[0035] [Variation 2] In the above-described embodiment and modification 1, the water surface position is detected by the water surface position detection means 6 using the float 63, but an ultrasonic sensor may be used as the water surface position detection means. In this second variant, an ultrasonic sensor is attached to the right side panel 133R or the left side panel 133L of the working unit 13, and ultrasonic waves are emitted toward the water surface, and the relative height between the halo 1 and the water surface is detected based on the time it takes for the ultrasonic waves reflected from the water surface to be received. Since the positional relationship between the mounting position of the ultrasonic sensor and the lower end position of the leveller 136 does not change, it is possible to adjust the vertical position of the harrow 1 (the lower end of the leveller 136) by raising and lowering the three-point link based on the detection result. If the distance to the water surface measured by the ultrasonic sensor is shorter than a predetermined distance, it is determined that the distance between the lower end of the leveller 136 and the water surface is long (deep), and the harrow 1 (the lower end of the leveller 136) is raised, and if the distance to the water surface measured by the ultrasonic sensor is longer than a predetermined distance, it is determined that the distance between the lower end of the leveller 136 and the water surface is short (shallow), and the harrow 1 (the lower end of the leveller 136) is lowered. In this way, by adjusting the vertical position of the harrow 1 based on the detection result of the ultrasonic sensor, the vertical position of the lower end of the leveller 136 is adjusted to be a constant distance from the water surface. The ultrasonic sensor may be attached at any location that is not limited to the side panel and can detect the water surface position.

[0036] [Another embodiment 1] In the above-described embodiment and variant example 1, the distance between the lower end of the leveller 136 and the water surface WS was maintained constant by adjusting the up and down position of the halo 1 based on the results of detection of the water surface WS by the water surface position detection means 6. Without being limited to this, the configuration may be such that the position of the water surface WS is easily visible to the operator, so that the operator can maintain a constant vertical position of the harrow 1, i.e., the distance between the lower end of the leveller 136 and the water surface WS, based on visual inspection. A marker member visible from the cockpit of the traveling vehicle body is attached to the lower end of a support rod 62 whose upper end is fixed to a support shaft 61 rotatably mounted on the front part of the right side plate 133R used in the water surface position detection means 6. The marker member may be of any structure that is easily visible from the cockpit, and examples include floats like 63, as well as shapes such as spheres, ellipsoids, and cylinders, and conspicuous colors such as red, as well as those that have reflective materials, emit fluorescence, or emit light (light up or flash). The operator raises and lowers the harrow 1 so that the distance between the marker member and the water surface WS remains constant, and adjusts the lower end of the leveller 136 so that it is at a constant distance from the water surface WS. By arranging the marker member so that the operator can easily see it from the cockpit, the height of the leveller 136 can be adjusted more accurately and easily than in the conventional method in which the operator adjusted the height by visually checking the lower end of the leveller 136.

[0037] The marker member may also be adapted so that the attachment position of the marker member to the support rod 62 can be adjusted, or the length of the support rod 62 can be adjusted, so that the height of the marker member relative to the halo 1 can be adjusted. In addition, the support rod 62 rotates within a range from a vertically downward position from the support shaft 61 to the rear, and can move rearward when a load is applied to the marker member. Note that the position at which the marker member is used is not limited to a vertically downward position from the support shaft 61, and may be at any angle. When not piling up soil, the support rod 62 and marker member can be fixed in a position (storage position) where they are rotated far backward, so that the marker member can be fixed in a position away from the water surface and does not become an obstacle to traveling. Movement to the storage position, fixing, release from the storage position, movement to the use position, etc. can be performed manually or by a driving means.

[0038] [Alternative embodiment 2] In the second alternative embodiment, a GPS is used. A GPS receiver is attached to the halo 1, and height information of the GPS receiver is acquired. The three-point link is raised and lowered to adjust the vertical position of the halo 1 so that the acquired height information becomes a predetermined height. By adjusting the vertical position of the halo 1, the vertical position of the lower end of the leveler 136 is adjusted to be at a constant distance from the water surface.

[0039] As described above, the embodiment, modification 1, modification 2, alternative embodiment 1, and alternative embodiment 2 of the harrow 1 including the earth-piling machine according to the present invention have been described in detail with reference to the drawings, but the specific configuration is not limited to these embodiment, modification 1, modification 2, alternative embodiment 1, and alternative embodiment 2, and even if there are design changes within the scope of the present invention, they are included in the present invention. In addition, the embodiment, modification 1, modification 2, alternative embodiment 1, and alternative embodiment 2 can be combined by utilizing each other's technology as long as there is no particular contradiction or problem in the purpose, configuration, etc. [Explanation of symbols]

[0040] 1. Hello 11 Mounting part 111 Top link connection 112 Lower link connection 113 Mounting part 113C Topmast 113L Left mounting part 113R Right mounting part 12 Frame structure 121 Frames 121L Left Frame 121R Right Frame 122 Gearbox 1221 Input shaft 123 Support part 123L Left support part 123R Right support part 13 Working section 131 Working rotor 1311 Working claw 1312 Rotation axis 132 Shield cover 133 Side Panel 133L left side plate 133R Right side plate 134 Apron 135 Rake 1341 Pressure Regulating Device 136 Leveller 1361 Understopper 1362 Operating lever 137 Extension Leveller 137L Left extension leveller 137R Right extension leveller 2 Lifting operation rod 3 Lifting lever 4 Link mechanism 41 Apron mounting fixture 42 First Rod 43 Central rotating member 44 Second Rod 5. Means of transmitting water surface position 51 Wire Arm 52 Wire 53 Torsion spring 54 Rotational position detection means 55 Communication Cable 6. Water surface position detection means 61 Spindle 62 Support rod 63 Float WS water surface FS Field surface

Claims

1. An agricultural work machine having a leveling plate that is connected to a traveling vehicle body having a lifting means and can be raised and lowered by the lifting means, A water surface position detection means is provided, An agricultural working machine characterized in that the agricultural working machine is raised and lowered based on the detection result of the water surface position detection means.

2. 2. The agricultural work machine according to claim 1, wherein the displacement of the water surface position detection means is transmitted to a member that operates the raising and lowering of the lifting means, thereby raising and lowering the agricultural work machine.

3. 2. The agricultural implement according to claim 1, wherein the agricultural implement is raised or lowered based on an output signal from the water surface position detection means.

4. 4. The agricultural machine according to claim 1, wherein the water surface position detection means has a float.

5. 5. The agricultural machine according to claim 4, wherein the float can be fixed at a position spaced apart from the water surface.

6. 5. The agricultural machine according to claim 4, wherein the float is attached to a rotating rod-shaped member.

7. 7. The agricultural machine according to claim 6, wherein the float can be fixed at a position away from the water surface by rotating the rod-shaped member.

8. 2. The agricultural machine according to claim 1, wherein the water surface position detection means is an ultrasonic sensor.

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