Field work device

Abstract

To eliminate the need to design and manufacture a field work device in accordance with the model of a tractor by providing a mechanism for raising / lowering adjustment of a land-leveling plate and for flipping up a ground wheel on a levee edge on the side of the field work device to be towed by the tractor, rather than on the tractor side.SOLUTION: A field work device 1 towed by a tractor 2 comprises a work machine body 12 provided with a land-leveling plate 7, and a levee edge flip-up assembly 13 provided with a grounding portion 18 and configured to be rotatable vertically relative to the work machine body 12. The levee edge flip-up assembly 13 includes: a first rotating plate 16 and a triangular rotating piece 17 that are rotatable about first pivot shafts 58, 59 relative to the work machine body 12 by extension and contraction of a first cylinder 38; and a grounding portion 18 that is rotatable about second pivot shafts 73, 74 relative to the first rotating plate 16 and the triangular rotating piece 17 by extension and contraction of a second cylinder 39. The grounding portion 18 is provided with a ground wheel (pressing wheel 9) via a ground wheel support frame rod 65.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a field work device equipped with a leveling machine that makes the ground surface of a field with differences in elevation even and flat, and in particular to a field work device that detects the height of the ground surface of the field by receiving laser light from a laser emitter at a reference height with a photodetector or by detecting it with a GPS receiver, and based on this detected height data determines a reference leveling height for the field, and performs leveling work on the field so that it reaches this reference leveling height. [Background technology]

[0002] Conventionally, in order to level the surface of an uneven field, a technique has been known in which the leveling plate of a leveling machine is kept at a constant reference working height using a laser beam emitted by a light emitter set outside the field as a reference, while the soil is moved throughout the field, ultimately resulting in a level surface parallel to the laser beam (see Patent Documents 1 and 2).

[0003] There is known a farm implement for leveling a field using a tractor and implement, which is equipped with a height position control device that uses signals from GPS satellites to align the field surface with a reference plane, in other words, to control the working height of the implement (see Patent Documents 2 and 3).

[0004] In addition, in a field work device equipped with a leveling plate and a packing wheel, a configuration is known in which a cylinder is activated to lift the packing wheel so that the packing wheel does not interfere with the ridge when the leveling plate approaches the edge of the ridge (see Patent Document 4).

[0005] Furthermore, a configuration is known in which a hydraulic cylinder equipped with a pressure wheel and controlling the working height of a leveling plate is provided on the farm work implement side (see Patent Document 5).

[0006] Also, a configuration is known in which a hydraulic cylinder equipped with a gauge wheel (tire wheel) and controlling the working height of a leveling plate is provided on the farm work implement side (see Patent Document 6). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 10-108508 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-8505 [Patent Document 3] Patent No. 6623060 [Patent Document 4] Patent No. 3791955 [Patent Document 5] Patent No. 3565458 [Patent Document 6] Japanese Patent Application Laid-Open No. 2001-314103 Summary of the Invention [Problem to be solved by the invention]

[0008] The field work devices described in the above Patent Documents 1 to 6 are extremely useful technologies for carrying out leveling work efficiently and safely. However, the present inventors have found that these technologies have the following issues that need to be improved.

[0009] In other words, in all of the conventional field work implements equipped with compacting wheels and leveling described in Patent Documents 1 to 4, a cylinder for controlling the working height of the leveling plate of the implement relative to the field surface and a link mechanism operated by the cylinder are provided on the tractor side that pulls the field work implement (the tractor side of the three-point link that connects the field work implement).

[0010] Patent documents 5 and 6 disclose a configuration in which the working height of a leveling plate is controlled by the operation of a hydraulic cylinder provided on the field work equipment having a crushing wheel or a tire wheel, but do not disclose a configuration in which the field work equipment is equipped with a ridge lifting mechanism that uses a hydraulic cylinder to lift up the crushing wheel or tire wheel so that it does not interfere with the ridge.

[0011] Tractors that pull field work implements are equipped with a three-point linkage so that they can pull not only field leveling implements but also various other field work implements for tasks such as breaking up, pulverizing, plowing, sowing, and fertilizing soil in the field, and are basically designed with a general-purpose structure.

[0012] Tractors generally have a fairly general structure and specifications to suit various types of farm work equipment, but the detailed structure varies depending on the manufacturer and model, and is not completely standardized.

[0013] For this reason, in order to equip a field work device equipped with a leveling plate and a packing wheel with cylinders and link mechanisms for mechanisms to prevent the packing wheel or tire wheel from interfering with the ridges, mechanisms to control the working height of the leveling plate, etc., on a tractor, it is necessary to configure the device to match the structure and specifications of the tractor of each manufacturer, etc.

[0014] However, designing and manufacturing a leveling implement to fit each manufacturer's and model's tractor is tedious, and since it is not possible to standardize parts, manufacturing and product costs are high. In addition, if necessary, the structure of the tractor must also be modified to match the configuration of the field implement.

[0015] In conventional field work equipment, some of the mechanisms for preventing the packing wheels or tire wheels from interfering with the ridges, and for controlling the working height of the leveling plate of the work equipment relative to the field surface, such as cylinders and link mechanisms, are located on the tractor side, and the following reasons are thought to be the reason why not all of the mechanisms are located on the field work equipment side.

[0016] Field work equipment for leveling is usually equipped with a leveling plate and a packing wheel or tire wheel, and a cylinder for raising only the packing wheel so that it does not interfere with the ridge at the edge of the ridge.However, if a cylinder and link mechanism for controlling the working height of the leveling plate were to be added to the field work equipment, the space within the field work equipment itself would be too narrow and the structure would become extremely complex.

[0017] Cylinders for mechanisms to prevent the crushing wheels or tire wheels from interfering with the ridges, and mechanisms to raise and lower the leveling plate, etc. are driven by hydraulic pressure, but the rotational driving force of the tractor is used as the power source for the pump that generates the hydraulic pressure, so it is better to install them on the tractor side, near the power source, to make the structure less complicated.

[0018] The present invention aims to solve the problems of conventional field work equipment for leveling described above, and aims to realize a field work equipment for leveling that is configured so that almost all of the mechanisms necessary for field work, such as mechanisms to prevent the packing wheels or tire wheels from interfering with the ridges, as well as cylinders and link mechanisms for controlling the working height of the leveling plate, are provided on the field work equipment towed by a tractor, thereby eliminating the need to design and manufacture the field work equipment to fit the tractor model and minimizing the need to specify or modify the tractor model. [Means for solving the problem]

[0019] In order to solve the above problems, the present invention provides a field work device which is connected to a tractor via a three-point linkage mechanism and towed, and which is equipped with a work machine body having a leveling plate, and a furrow-edge jump-up assembly which is rotatable in the vertical direction relative to the work machine body, and which performs leveling work on the ground surface of a field, the furrow-edge jump-up assembly having a first rotating plate which is rotatable about a first pivot shaft relative to the work machine body, and a ground contact part, and the ground contact part has a second rotating plate which is rotatable about a second pivot shaft relative to the first rotating plate, and The present invention provides a field work device characterized by a configuration comprising a ground contact wheel support frame rod fixed to a plate and a ground contact wheel attached to the ground contact wheel support frame rod, wherein the furrow jump-up assembly can be rotated up and down around a first pivot axis relative to the work machine body by operation of a hydraulically operated first cylinder provided between the work machine body and a first rotating plate, and the ground contact part can be rotated up and down around a second pivot axis relative to the first rotating plate by operation of a hydraulically operated second cylinder provided between the first rotating plate and a second rotating plate.

[0020] In order to solve the above problems, the present invention provides a field work device which is connected to a tractor via a three-point linkage mechanism and towed, and which is equipped with a work machine body having a leveling plate, and a furrow-edge jump-up assembly which is rotatable in the vertical direction relative to the work machine body, and which performs leveling work on the ground surface of a field, the furrow-edge jump-up assembly being capable of rotating about a first pivot shaft relative to the work machine body, and a ground contact part, and the ground contact part is equipped with a second pivot plate and link plate which are rotatable about a second pivot shaft relative to the first pivot plate and the triangular pivot plate, Provided is a field work device comprising left and right side plates fixed to both ends of a ram rod, a ground contact wheel rotation shaft rotatably attached to the left and right side plates, and a ground contact wheel attached to the ground contact wheel rotation shaft, a first cylinder whose piston rod is hydraulically extended and retracted between the work machine body and the first rotating plate, and operation of the first cylinder allows the furrow edge jumping assembly to rotate vertically around the first pivot shaft relative to the work machine body, and a second cylinder whose piston rod is hydraulically extended and retracted between the first rotating plate and the second rotating plate, and operation of the second cylinder allows the ground contact part to rotate vertically around the second pivot shaft relative to the second cylinder rotating plate and triangular rotating piece.

[0021] It is preferable that the work machine body is provided with a leveling plate mounting frame extending horizontally in the width direction, and leveling plates are attached to the leveling plate mounting frame at intervals in the longitudinal direction.

[0022] It is preferable that a tine mounting frame rod extending horizontally in the width direction is fixed to the first pivot plate and the triangular pivot piece, and that the tines are attached to the tine mounting frame rod at intervals along its length.

[0023] The ground-contacting wheels are preferably configured as pressure-reducing wheels or tire wheels.

[0024] The work machine body is provided with an oil tank for supplying oil to the first and second cylinders, a hydraulic pump, a switching valve device, and a control device for controlling the switching valve device, and a transmission shaft for transmitting power from the tractor side to the hydraulic pump is arranged between the hydraulic pump and the tractor PTO shaft, and it is preferable that the control device be configured as a means for sending a switching control signal to the switching valve device based on an operation signal from an operating unit provided on the tractor side and height measurement data from a laser height measuring device or a GPS positioning device. [Effects of the Invention]

[0025] According to the present invention, a leveling plate is provided on the working machine body, a pressure wheel or tire wheel and a furrow-edge jump-up assembly equipped with tines are made rotatable relative to the working machine body by the extension and contraction of a first cylinder, and the pressure wheel or tire wheel in the furrow-edge jump-up assembly is made rotatable relative to the working machine body by a second cylinder, and a field work implement equipped with the working machine body and furrow-edge jump-up assembly is provided not on the tractor side but on the field work implement side towed by the tractor.

[0026] With this configuration, the field work apparatus according to the present invention does not need to be designed, manufactured, or commercialized to fit the tractor that pulls it, and there is no need to modify the structure of the tractor to fit the field work apparatus. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a diagram for explaining the overall configuration of a first embodiment of a farm work apparatus according to the present invention and the operation when a leveling plate is raised. FIG. [Figure 2] FIG. 1 is a perspective view of the field work apparatus of the first embodiment, seen obliquely from the front. [Figure 3] FIG. 2 is a perspective view of the farm field work apparatus of the first embodiment, seen obliquely from behind. [Figure 4] FIG. 4 is an enlarged perspective view of the left part of FIG. 3 for explaining the main parts of the field work apparatus of the first embodiment. [Figure 5] FIG. 5 is a perspective view showing the main part of the part shown in FIG. 4 for explaining the main part of the field work apparatus of the first embodiment. [Figure 6] 4A to 4C are diagrams for explaining the jumping-up operation at the edge of a ridge of the farmland working implement of the first embodiment. [Figure 7] 5 is a diagram for explaining the operation when the leveling plate of the field work apparatus of the first embodiment is lowered. FIG. [Figure 8] FIG. 10 is a perspective view showing the overall configuration of a second embodiment of the field work apparatus of the present invention, as seen obliquely from behind. [Figure 9] 10 is a diagram for explaining the overall configuration of the field work apparatus of the second embodiment and the operation when the leveling plate is raised. FIG. [Figure 10] FIG. 10 is a perspective view showing the overall configuration of a third embodiment of the field work apparatus of the present invention, as seen obliquely from behind. [Figure 11] FIG. 10 is a side view showing the overall configuration of the field work apparatus of the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0028] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A field work apparatus according to an embodiment of the present invention will be described below with reference to the accompanying drawings. [Example]

[0029] Example 1 A first embodiment of a field work implement according to the present invention will be described with reference to Figures 1 to 7. In the following description, the direction in which the field work implement moves forward and backward as towed by a tractor will be referred to as the fore-and-aft direction (longitudinal direction), and the left and right directions facing forward will be referred to as the left-right direction (lateral direction or width direction).

[0030] As shown in Figures 1 to 3, this field work device 1 is connected to a tractor 2 via a three-point linkage mechanism 3 so that it can be raised and lowered (moved up and down), and is towed by the tractor 2 to travel across the field and perform leveling work on an uneven field surface (ground surface of the field) 6.

[0031] Overall configuration: First, the overall configuration of the field work implement 1 will be described with reference to Figures 1 to 3. The field work implement 1 is equipped with a leveling plate 7, tines 8, and compacting wheels 9 as its working implements. As shown in Figures 2 and 3, the field work implement 1 has an overall configuration including a work implement main body 12 and left and right furrow-edge lifting assemblies 13.

[0032] In this Example 1, packing wheels 9 are provided, but in Example 2 described later, tire wheels are provided instead of packing wheels 9. These packing wheels 9 and tire wheels come into contact with the surface of the field and roll when leveling work is performed by the field work implement 1, and also come into contact with the surface of the field and function as a support for the up and down movement of the work implement body 12 when adjusting the height of the leveling plate 7, as will be described later.

[0033] The packing wheels 9 and tire wheels (see Example 2 described later) that perform such functions are called "ground-contact wheels" in the field work apparatus 1 according to the present invention. In short, the packing wheels 9 and tire wheels are each "ground-contact wheels" in their higher-level conceptual configuration.

[0034] As shown in Figure 1, the work machine body 12 is connected to the tractor 2 via a three-point linkage mechanism 3 so that it can be raised and lowered (moved up and down), and a leveling plate 7 is fixed to its lower part facing toward the field surface 6, i.e., downward.

[0035] The left and right ridge-edge spring-up assemblies 13 have the same configuration, so the following description will focus on the left ridge-edge spring-up assembly 13.

[0036] The furrow edge jump-up assembly 13 has a first rotating plate 16 and left and right triangular rotating pieces 17 rotatably attached to the work machine body 12, and a ground contact portion 18 rotatably attached to the first rotating plate 16 and the left and right triangular rotating pieces 17.

[0037] A tine mounting frame rod 21 extending horizontally in the width direction is fixed to the lower part of the first rotating plate 16 and the triangular rotating piece 17, and a plurality of tines 8 are fixed downward at intervals along the length of the tine mounting frame rod 21. A pressure wheel 9 is provided on the ground contact portion 18 as a ground contact wheel.

[0038] As will be described later, the field work device 1 rotates the entire ridge-edge lifting assembly 13 up and down by operating the first cylinder 38, thereby avoiding interference between the packing wheels 9 and the ridges. Also, by operating the second cylinder 39, the ground contact part 18 rotates relative to the work machine body 12, allowing the leveling plate 7 of the work machine body 12 to be raised and lowered, thereby adjusting the height.

[0039] A command signal for lifting the furrow from an operation panel 30 provided on the tractor 2 side is input to the control device 28, which in turn generates a control signal that activates the switching valve device, operates the first cylinder 38, and rotates the furrow lifting assembly 13 upward as shown in Figure 6.

[0040] Furthermore, the farm work implement 1 is capable of adjusting the height of the leveling plate 7 in order to determine the cultivation depth and perform leveling according to the unevenness of the ground surface of the farm field, the type of crop, etc.

[0041] Leveler adjustment control means that acquire data for such height adjustment and control hydraulic pressure based on that data include means that use laser light as described in Patent Documents 1 to 3 above, and means that use GPS signals.

[0042] The field work apparatus 1 of the present invention is characterized in that the field work apparatus 1 is towed by a tractor 2, and has a furrow edge jump-up assembly 13 with a ground contact portion 18 that is rotatable on the work machine body 12, and further has a mechanism for adjusting the height of the leveling plate 7 provided on the work machine body 12, with the ground contact portion 18 being configured to rotate relative to the work machine body 12.

[0043] Therefore, the field work apparatus 1 according to the present invention is not directed to the leveler adjustment control means itself, but here, as an example of the leveler adjustment control means, the basic configuration of the leveler adjustment control means 22 that uses laser light will be mentioned in Figures 1, 6, 7, etc.

[0044] The leveler adjustment control means 22 receives laser light L from a laser emitter 26 installed at an appropriate location in the field using a laser light receiving height measuring device 27 installed in the field work device 1, measures the height of the field surface 6, and controls a switching valve device 29 using a control device 28 installed in the field work device 1 based on this height measurement data.

[0045] Although not shown in the figure, instead of using the laser light receiving height measuring device 27, a signal from a positioning satellite may be received by a GPS antenna, and based on this, the height of the field surface 6 may be measured by a GPS receiving device (see Patent Documents 2 and 3), and based on this height measurement data, the switching valve device 29 may be controlled by a control device 28 mounted on the field work device 1.

[0046] Hydraulic oil is stored in an oil tank 33 provided in the work machine body 12, and is sent to a switching valve device 29 by a hydraulic pump 34. Then, based on a control signal from a control device 28, the switching valve device 29 selectively sends the oil to a first hydraulic cylinder (hereinafter simply referred to as the "first cylinder") 38 or a second hydraulic cylinder (hereinafter simply referred to as the "second cylinder") 39, which will be described later.

[0047] The driving force of the hydraulic pump 34 is transmitted from a drive source on the tractor 2 side via a transmission shaft 40 having a universal joint. Specifically, a splined cylindrical portion 43 having an inner surface on which splines are formed is provided at the front end of the transmission shaft 40.

[0048] The transmission shaft 40 is spline-connected to a PTO shaft 44 of the tractor 2 via the splined cylindrical portion 43. PTO is an abbreviation for "Power Take Off," and the PTO shaft refers to a power take-off shaft that is normally provided on a tractor. The rear end of the transmission shaft 40 is connected to a rotation mechanism 45 of the hydraulic pump 34.

[0049] As described above, the feature of the present invention is that the field work implement 1 towed by the tractor 2 is provided with a work implement body 12 for field work and a furrow-edge jump-up assembly 13. Below, we will explain the work implement body 12 and the furrow-edge jump-up assembly 13, and further explain the configuration of the ground contact part 18 of the furrow-edge jump-up assembly 13.

[0050] Work machine body: As shown in Figures 1 to 3, the work machine body 12 has a pair of three-point link mounting parts 48 at the top and bottom, left and right vertical stand rods 49 on the left and right, a main body frame 50 that is long from front to back, and a leveling plate mounting frame 51 that is fixed to the rear of the main body frame 50 and extends horizontally on the left and right.

[0051] The three-point link mounting portion 48 is a portion to which the rear end portion of the three-point link mechanism 3 for connecting with the tractor 2 is rotatably mounted.

[0052] A plurality of leveling plate mounting rods 52 are fixed to the leveling plate mounting frame 51 at intervals in the longitudinal direction on the left and right sides and pointing downward, and the leveling plate 7 is attached to the front of these plurality of leveling plate mounting rods 52.

[0053] Furthermore, left and right cylinder mounting frames 53 are fixed to the leveling plate mounting frame 51, and further, triangular rotating piece support members 54 for rotatably supporting the triangular rotating piece 17 on the work machine body 12 are fixed to the left and right of the cylinder mounting frames 53 (see Figures 2 and 3).

[0054] The complete furrow lift assembly consists of: Next, we will explain the ridge-edge jump-up assemblies 13. A pair of ridge-edge jump-up assemblies 13 are provided on the left and right sides of the field work implement 1, but as described above, the left and right ridge-edge jump-up assemblies 13 have the same configuration, so we will mainly explain the left ridge-edge jump-up assembly 13 with reference to Figures 1 to 5, etc.

[0055] As shown in Figures 2 to 4, the furrow edge jump-up assembly 13 has, as described above, a first rotating plate 16 and a pair of left and right triangular rotating pieces 17 rotatably attached to the work machine body 12, and a ground contact portion 18 rotatably attached to the first rotating plate 16 and the triangular rotating pieces 17.

[0056] As described above, the tine mounting frame rod 21 is fixedly attached so as to be gripped by the lower ends of the first rotating plate 16 and the pair of left and right triangular rotating pieces 17, as shown in Figures 4 and 5. A plurality of tines 8 are attached to the tine mounting frame rod 21 at intervals in the left and right longitudinal direction.

[0057] The first rotating plate 16 is trapezoidal in plan view, and its front end is attached to the rear end of the cylinder mounting frame 53 so as to be rotatable around a pivot shaft 58 (see Figures 4 and 5). In addition, the front end of the triangular rotating piece 17 is attached to the triangular rotating piece support member 54 so as to be rotatable around a pivot shaft 59 (see Figure 4).

[0058] 1 is a side view of the field work implement 1, and only the pivot shaft 59 on the near side is actually visible. However, when viewed from the side on a vertical plane along the direction of travel (front-to-back direction) of the field work implement 1, the pivot shafts 58 and 59 are arranged concentrically (at the same position when viewed from the side). For this reason, in FIG. 1, for the convenience of explaining that the pivot shafts 58 and 59 are concentric, the reference numerals 58 and 59 are used to refer to the portion of the pivot shaft 58.

[0059] The pivot shafts 58 and 59 are common pivot shafts that rotatably mount the first rotating plate 16 and the triangular rotating piece 17 to the work machine body 12 (more specifically, to the cylinder mounting frame 53 and the triangular rotating piece support member 54, respectively), and so in this specification they are also referred to collectively as the first pivot shafts 58, 59. The "first pivot shaft" described in the claims is defined as these pivot shafts 58, 59 (pivot shaft 58 and pivot shaft 59).

[0060] The first cylinder 38 is attached between the cylinder attachment frame 53 and the first rotating plate 16 (see FIGS. 4 and 5). Specifically, the base end of the first cylinder 38 (the base end of the cylinder barrel) is rotatably attached to the front end of the cylinder attachment frame 53, and the tip end of the first cylinder 38 (the tip end of the piston rod) is rotatably attached to the upper end of the first rotating plate 16.

[0061] With this configuration, as shown in Figure 6, by moving the piston rod in the first cylinder 38 in the A, A' direction, the furrow jump-up assembly 13 can rotate in the B, B' direction around the first pivot axes 58, 59 relative to the work machine main body 12.

[0062] Ridge lift assembly contact area: Next, the configuration of the ground contact portion 18 in the ridge jumping assembly 13 will be described mainly with reference to FIGS.

[0063] The ground contact portion 18 includes a pressure reducing wheel 9, a ground contact wheel rotation shaft 63, left and right side plates 64 for mounting the ground contact wheel rotation shaft 63, a ground contact wheel support frame rod 65, a second rotating plate 68, and left and right link plates 69.

[0064] 2 to 5, the suppressing wheel 9 is formed in a spiral shape and is attached to a ground contact wheel rotation shaft 63. The left and right ends of the ground contact wheel rotation shaft 63 are rotatably attached to left and right side plates 64, respectively.

[0065] As shown in Figure 3, the front ends of the left and right side plates 64 are fixed perpendicularly to the left and right ends of the ground contact wheel support frame rod 65. The rear ends of the left and right link plates 69 are fixed to the left and right sides of the ground contact wheel support frame rod 65, respectively.

[0066] 4 and 5, the second rotating plate 68 is substantially triangular in plan view, and its front corner is rotatably attached to the rear end of the first rotating plate 16 by a pivot shaft 73. Also, as shown in FIG. 4, the left and right link plates 69 are rotatably attached to the rear end of the triangular rotating piece 17 by a pivot shaft 74.

[0067] 1 is a side view of the field work implement, and only the pivot shaft 74 on the near side is actually visible. However, when viewed from the side on a vertical plane along the direction of travel (front-to-back direction) of the field work implement, the pivot shafts 73 and 74 are arranged concentrically (at the same position when viewed from the side). For this reason, in FIG. 1, for the convenience of explaining that the pivot shafts 73 and 74 are concentric, the reference numerals 73 and 74 are used to denote the pivot shaft 74.

[0068] The pivot shafts 73 and 74 are common pivot shafts that rotatably attach the second rotating plate 68 and the link plate 69 to the first rotating plate 16 and the triangular rotating piece 17, respectively, and are therefore collectively referred to as the second pivot shafts 73 and 74 in this specification. The "second pivot shaft" described in the claims is defined as these pivot shafts 73 and 74 (pivot shafts 73 and 74).

[0069] 4 and 5, a second cylinder 39 is attached between the top of the first rotating plate 16 and the top of the second first rotating plate 16. Specifically, as shown in FIG. 1, the base end of the second cylinder 39 (the base end of the cylinder barrel) is rotatably attached to the first rotating plate 16, and the tip end of the second cylinder 39 (the tip end of the piston rod) is rotatably attached to the upper end of the second rotating plate 68.

[0070] With this configuration, by moving the piston rod of the second cylinder 39 in the direction of arrow C (see Figure 1) or the direction of arrow C' (see Figure 7), the grounding portion 18 can rotate in directions D (see Figure 1) or D' (see Figure 7) around the second pivot axes 73, 74 relative to the first rotating plate 16 and the triangular rotating piece 17 (see Figures 1, 4, and 5).

[0071] When the ground contact portion 18 is capable of rotating in the direction D or D' as described above, the crushing wheel 9 moves inward on the field surface 6 in the direction of arrow E or retracts in the direction of arrow E', as shown in Figure 1 or Figure 7, as will be described later.

[0072] For this purpose, the second pivot shafts 73, 74, the first rotating plate 16, the first cylinder 38 in a restrained state, and the implement body 12 are raised or lowered, thereby causing the leveling plate 7 to rise in the F direction or to fall in the F' direction, enabling the leveling plate 7 to perform leveling work to achieve horizontal and slope uniformity on the field surface 6.

[0073] Such control of the height of the leveling plate 7 (leveller adjustment control) is performed by receiving laser light L from a laser emitter 26 installed at an appropriate location in the field with a laser light receiving height measuring device 27 installed in the field work equipment 1, and automatically measuring the height of the field surface 6.

[0074] That is, the control signal generated by the control device 28 based on the height measurement data switches the switching valve device 29, sends the hydraulic pressure generated by the hydraulic pump 34 to the second cylinder 39, and the second cylinder 39 operates the ground contact portion 18, thereby controlling the height of the leveling plate 7.

[0075] (action) The operation of the field work apparatus 1 according to the present invention, which is configured as described above, will be explained with reference to Figures 1 to 7. During normal leveling work, the field work apparatus 1 has the leveling plate 7 and the furrow-edge jumping assembly 13 (comprising the ground contact portion 18 and the tines 8) in the state shown in Figures 1 and 7.

[0076] Incidentally, in a farm field, for example, when the farm work implement 1 is performing leveling work or moving along the edge of a ridge, the ridge may cause interference and get in the way of the repressing wheels 9. In such cases, it is necessary to rotate the repressing wheels 9 upward and bounce them up to avoid the ridge.

[0077] In such a case, the operator operates the operation panel 30 provided on the tractor 2 side to send a command signal for lifting the ridge to the control device 28, and the control device 28 generates a signal to raise the ridge lift assembly 13, which is sent to the switching valve device 29 to switch the hydraulic pressure, and operates the piston rod of the first cylinder 38 in direction A, retracting it toward the cylinder barrel, as shown in Figure 6.

[0078] Then, with the second cylinder 39 in a restrained state (the piston rod does not move), the first rotating plate 16 and the entire furrow jump-up assembly 13 rotate upward (counterclockwise in the direction B in Figure 6) around the first pivot axes 58, 59.

[0079] This causes the ridge-edge lifting assembly 13, which has the crushing wheels 9 and tines 8, to lift in the direction of the solid arrow, preventing it from interfering with the ridge and obstructing it. Note that when returning the ridge-edge lifting assembly 13 to the state shown in Figure 1 where it is ready for normal leveling work, the above action is reversed.

[0080] That is, the operator operates the operation panel 30 to send a command signal for lifting and returning the ridge to the control device 28, which generates a signal to lower the ridge edge lifting assembly 13 and sends this to the switching valve device 29, which operates the piston rod of the first cylinder 38 in the direction A', extending from the cylinder side, which is the opposite direction to that shown in Figure 6.

[0081] Then, with the second cylinder 39 in a restrained state (the piston rod does not move), the first rotating plate 16 and the entire ridge-edge jump-up assembly 13 rotate downward (counterclockwise in the direction B' in Figure 6) around the first pivot shafts 58, 59. As a result, the ridge-edge jump-up assembly 13 descends in the direction of the dotted arrow, returning it to the state shown in Figure 1 where it is ready for normal leveling work.

[0082] Next, we will explain the operation of the field work device 1, in the normal leveling work state shown in Figure 1, to change (control) the height position of the leveling plate 7 relative to the surface of the field in order to level the surface of the field to a predetermined height depending on the conditions of the field surface 6, such as the unevenness, slope, and the cultivated crop being bred.

[0083] Laser light L from laser emitter 26, which indicates the reference height, is received by laser light receiving height measuring device 27, which generates a height measurement signal and sends it to control device 28. In addition, the worker operating tractor 2 sets the height of leveling plate 7 to the desired height using operation panel 30 provided on tractor 2, and sends the height setting signal to control device 28.

[0084] The control device 28 generates a height control signal for the leveling plate 7 based on the height measurement signal and the set height setting signal, and controls the switching valve device 29 using this control signal to cause the piston rod of the second cylinder 39 to extend and retract relative to the cylinder barrel.

[0085] For example, when the leveling plate 7 is raised to increase its height, in FIG. 1, the switching valve device 29 is controlled by a height control signal that increases the height of the leveling plate 7, and when the first cylinder 38 is in a restrained state (the piston rod does not move), the piston rod of the second cylinder 39 extends from the piston barrel in the direction of arrow C, and the second rotating plate 68 and link plate 69 rotate clockwise around the second pivot axes 73 and 74.

[0086] Then, the side plate 64 rotates in the direction of arrow D via the ground contact wheel support frame rod 65, and the suppression wheel 9 moves forward in the direction of arrow E, pressing against the field surface 6 from above. As a result, the second pivot shafts 73 and 74 move upward, and accordingly, the first rotating plate 16 and triangular rotating piece 17 also rise.

[0087] As described above, since the first cylinder 38 is in a restrained state, when the first rotating plate 16 and the triangular rotating piece 17 rise, the first cylinder 38 and the work machine body 12 to which the first rotating plate 16 and the triangular rotating piece 17 are attached rise simultaneously together with the first rotating plate 16 and the triangular rotating piece 17. As a result, the leveling plate 7 attached to the work machine body 12 rises as shown by arrow F.

[0088] When the leveling plate 7 is lowered to reduce its height, the operation is the opposite of the above-mentioned raising operation. In Figure 7, when the piston rod of the second cylinder 39 is operated in the direction C' to retract into the cylinder barrel, the ground contact portion 18 (second rotating plate 68, link plate 69, side plate 64, suppressing wheel 9) rotates upward in the direction of arrow D' around the second pivot shafts 73, 74.

[0089] As a result, the crushing wheel 9 moves in the direction of arrow E', retreating backward along the field surface 6, causing the second pivot axes 73, 74 to move downward, moving the first rotating plate 16, the triangular rotating piece 17, and the first cylinder 38 in a restrained state downward, and also moving the working machine body 12 downward.

[0090] As a result, the leveling plate 7 is lowered relative to the field surface 6, and is brought into or close to the field surface 6, making it possible to level the uneven ground surface of the field to a constant height.

[0091] Even if the field is on a gentle slope and the field surface 6 is gently inclined relative to the horizontal plane, the second cylinder 39 operates via the control device 28 and the switching valve device 29 in response to the height signal from the laser light receiving height measuring device 27, making it possible to perform leveling work by keeping the leveling plate 7 at a constant height (depth) relative to the inclined field surface 6.

[0092] The field work device 1 according to the present invention is characterized in that the leveling plate 7 is provided on the work machine body 12, and the furrow edge lifting assembly 13 equipped with the crushing wheel 9 and the tine 8 can be rotated relative to the work machine body 12 by extension and contraction of the first cylinder 38.

[0093] Furthermore, in the furrow jump-up assembly 13 that can be rotated relative to the work machine body 12, the ground contact portion 18 is configured to be substantially rotatable relative to the work machine body 12 by the second cylinder 39.

[0094] Here, "substantially" means that when the first cylinder 38 is in a restrained state, the work machine body 12 and the first rotating plate 16 and triangular rotating piece 17 of the furrow jump-up assembly 13 are substantially integrated, and the ground contact portion 18 rotates relative to the first rotating plate 16 and triangular rotating piece 17.

[0095] This allows the work implement body 12 or the leveling plate 7 to be raised and lowered relative to the pressure wheels 9 on the ground contact portion 18. The work implement body 12 and the furrow edge jump-up assembly 13 are not provided on the tractor 2 side, but on the field work implement 1 side towed by the tractor 2 side.

[0096] As described above, in the field work device 1, in addition to the configuration that enables the lifting operation of the furrow-edge lifting assembly 13 by the first cylinder 38, the work machine body 12 moves up and down in response to the extension and contraction operation of the second cylinder 39, raising and lowering the leveling plate 7, and the three-point link moves up and down relative to the work machine tractor 2.

[0097] This configuration according to the present invention is the opposite of the conventional configuration in which a three-point link is operated by drive from the tractor side, causing the work machine body 12 to move up and down, thereby raising and lowering the leveling plate, and is a configuration that is a characteristic of the present invention.

[0098] By adopting such a characteristic configuration, the field work apparatus 1 according to the invention does not need to be designed, manufactured, or commercialized to fit the structure and specifications of the tractor 2 that pulls the field work apparatus 1. Also, for the tractor 2, there is basically no need to select a model that is compatible with the field work apparatus 1, or to further modify its structure.

[0099] Therefore, when a user purchases a new field work implement 1 or tractor 2, the user does not have to go through the trouble of selecting a field work implement 1 that is compatible with the tractor 2 that the user already owns, or it becomes easier for the user to select a tractor 2 that is compatible with the field work implement 1 that the user already owns.

[0100] Example 2 A second embodiment of a field work apparatus according to the present invention will be described with reference to Figures 8 and 9. A field work apparatus 81 of the second embodiment is configured such that tire wheels 82 are provided instead of the packing wheels 9 in the field work apparatus 1 of the first embodiment, but other configurations and functions are the same as those of the field work apparatus 1 of the first embodiment. The following description of the second embodiment will focus on configurations that differ from the first embodiment.

[0101] As shown in Figure 3, in the field work implement 1 of Example 1, the ground contact portions 18 on the left and right sides are each provided with a compression wheel 9 as a ground contact wheel, but in the field work implement 82 of Example 2, instead of the compression wheels 9, as shown in Figure 8, four tire wheels 82 are provided on each side, for a total of eight tire wheels 82.

[0102] Specifically, as shown in Figure 8, a pair of side plates 64 on the left and right sides of the rear of the field work implement 2 are provided, one on each side, and a pair of side plates 64 on the right (a total of four side plates for the entire field work implement 2). Four tire wheels 82 (a total of eight for the entire field work implement 2) are attached between each pair of side plates 64 on the left and right sides.

[0103] A ground-contact wheel rotation shaft 63 is rotatably provided between the pair of side plates 64, and the tire wheels 82 are attached to this ground-contact wheel rotation shaft 63. In short, the four tire wheels 82 on the left and right sides are rotatably provided between the pairs of side plates 64 on the left and right sides, respectively. In this second embodiment, a total of eight tire wheels 82 are provided, but the number of tire wheels 82 can be determined appropriately taking into consideration the width of the field work implement 82, etc.

[0104] The operation of the field work implement 82 of Example 2 is the same as the operation of the field work implement 1 of Example 1. When adjusting the height of the leveling plate 7, to raise the leveling plate 7 relative to the field surface 6, the piston rod of the second cylinder 39 is extended from the piston tube in the direction of arrow C, as shown in Figure 9, in the same way as in Example 1 shown in Figure 1.

[0105] This causes the side plate 64 to rotate in the direction of arrow D via the second rotating plate 68, and the tire wheel 82 to move forward in the direction of arrow E on the field surface 6. This then causes the work machine body 12 and the leveling plate 7 attached to the work machine body 12 to rise via the side plate 64, ground contact wheel support frame rod 65, link plate 69, first rotating plate 16, and triangular rotating piece 17.

[0106] Furthermore, when adjusting the height of the leveling plate 7, when the leveling plate 7 is lowered relative to the field surface 6, the piston rod of the second cylinder 39 is operated in the direction of retracting into the cylinder barrel, as in the case of Example 1 shown in Figure 7, although this is not specifically shown in Example 2.

[0107] This causes the tire wheel 82 to move backward (in the opposite direction to arrow E in Figure 9) along the field surface 6, and lowers the work machine body 12 and the leveling plate 7 attached to the work machine body 12 via the side plate 64, the ground wheel support frame rod 65, the link plate 69, the first pivot plate 16 and the triangular pivot piece 17.

[0108] Example 3 A third embodiment of a field work apparatus according to the present invention will be described with reference to Figures 10 and 11. A field work apparatus 91 of the third embodiment has the same configuration and function as the field work apparatus 1 of the first embodiment.

[0109] The field work apparatus 1 of Example 1 is configured such that a pair of left and right ground contact portions 18 are provided with a repressing wheel 9 (a pair of left and right repressing wheels 9) in the direction of travel, as shown in Figure 3. In contrast, the field work apparatus 91 of Example 3 differs from the field work apparatus 1 of Example 1 in that it has a single ground contact portion 18 and a single repressing wheel 9, as shown in Figure 10.

[0110] In short, the field work apparatus 1 of Example 1 is an embodiment in which the present invention is applied to a large field work apparatus equipped with a leveling plate 7 having a long width, whereas the field work apparatus 91 of Example 3 is an embodiment in which the present invention is applied to a small field work apparatus equipped with a leveling plate 7 having a short width.

[0111] As described above, the configuration of the field work apparatus 91 of Example 3 differs from the field work apparatus 1 of Example 1 in that the crushing wheels 9 are provided on both the left and right sides or one wheel is provided, but the configuration of the invention is the same.

[0112] Therefore, the field work apparatus 91 of Example 3 is shown in Figures 10 and 11 with the same reference numerals assigned to the same main components as those of the field work apparatus 1 of Example 1, and a detailed description thereof will be omitted. The operation of the field work apparatus 91 of Example 3 is also the same as that of the field work apparatus 1 of Example 1, and therefore a description thereof will be omitted.

[0113] In the field work implement 91 of Example 3, the field work implement 1 of Example 1 is miniaturized and provided with one compacting wheel 9, but the field work implement 81 of Example 2 is miniaturized from the configuration in which a total of eight tire wheels 82 are provided, four on each of a pair of left and right ground contact portions 18, and although not shown here, it is also possible to provide a configuration in which there is one ground contact portion and, for example, four tire wheels are provided.

[0114] The above has described the form for implementing the field work apparatus according to the present invention based on the examples, but the present invention is not limited to such examples, and it goes without saying that there are various examples within the scope of the technical matters described in the claims.

[0115] In addition, when adjusting the height of the leveling plate 7, the ground wheels (compacting wheels, tire wheels) come into contact with the surface of the field and function as a support for the up and down movement of the work machine body 12, but instead of the ground wheels, it is also possible to configure a sled that slides on the surface of the field as an equivalent component that performs this function. [Industrial Applicability]

[0116] Since the field work implement according to the present invention has the above-described configuration, it can be used by being towed by various types of tractors or relatively versatile types of tractors, provided that there are no problems with towing performance (engine horsepower, etc.). [Explanation of symbols]

[0117] 1. Field work equipment 2 Tractors 3 Three-point linkage mechanism 6. Field surface 7 Leveling plate 8 tines 9. Suppression Wheel 12 Work machine body 13 Ridge jump-up assembly 16 First rotating plate 17 Triangular rotating piece 18 Grounding part 21 Tine mounting frame rod 22 Leveler adjustment control means 26 Laser emitter 27 Laser beam receiving height measuring device 28 Control Device 29 Switching valve device 30 Operation panel on the tractor side 33 Oil Tank 34 Hydraulic pump 38 No. 1 cylinder 39 No. 2 cylinder 40 Transmission shaft 43 Splined cylindrical portion of transmission shaft 44 Tractor PTO shaft 45 Hydraulic pump rotation mechanism 48 Three-point link mounting part 49 Vertical Stand Rod 50 Main frame 51 Leveling plate mounting frame 52 Leveling plate mounting rod 53 Cylinder mounting frame 54 Triangular rotating piece support member 58, 59 First pivot axis 63 Ground wheel rotation axis 64 Side Panel 65 Ground wheel support frame rod 68 Second rotating plate 69 Link Plate 73, 74 Second pivot axis 81 Field work equipment 82 Tire Wheel 91 Field work equipment

Claims

1. A field work device that is connected to a tractor via a three-point linkage mechanism and towed, and that is equipped with a work machine body having a leveling plate, and a furrow-edge jump-up assembly that can rotate up and down relative to the work machine body, and that makes it possible to adjust the vertical position of the leveling plate, and that performs leveling work on the ground surface of a field, The furrow jump-up assembly includes a first rotating plate that is rotatable about a first pivot shaft relative to the work machine body, and a ground contact portion; The ground contact part includes a second rotating plate that is rotatable around a second pivot shaft relative to the first rotating plate, a ground contact wheel support frame rod fixed to the second rotating plate, and a ground contact wheel attached via the ground contact wheel support frame rod; By actuation of a hydraulically operated first cylinder provided between the work machine body and the first rotating plate, the furrow jump-up assembly can be rotated in the vertical direction around the first pivot shaft relative to the work machine body, A field work device characterized in that the ground contact portion can be rotated in the vertical direction relative to the first rotating plate around a second pivot axis by operating a hydraulically operated second cylinder provided between the first rotating plate and the second rotating plate.

2. A field work device that is connected to a tractor via a three-point linkage mechanism and towed, and that is equipped with a work machine body having a leveling plate, and a furrow-edge jump-up assembly that can rotate up and down relative to the work machine body, and that makes it possible to adjust the vertical position of the leveling plate, and that performs leveling work on the ground surface of a field, The furrow jump-up assembly includes a first rotating plate and a triangular rotating piece that are rotatable around a first pivot shaft relative to the work machine body, and a ground contact portion; The ground contact part comprises a second rotating plate and a link plate which are rotatable about a second pivot axis relative to the first rotating plate and the triangular rotating piece, respectively; a ground contact wheel support frame rod which extends horizontally in the width direction and is fixed so as to be perpendicular to the second rotating plate and the link plate; left and right side plates which are fixed to both ends of the ground contact wheel support frame rod; a ground contact wheel rotation shaft which is rotatably attached to the left and right side plates; and a ground contact wheel attached to the ground contact wheel rotation shaft. A first cylinder is provided between the work machine body and the first rotating plate, and the piston rod of the first cylinder is hydraulically extended and retracted. By operating the first cylinder, the furrow jumping assembly can be rotated in the vertical direction around the first pivot shaft relative to the work machine body. A second cylinder is provided between the first rotating plate and the second rotating plate, and the piston rod extends and retracts hydraulically. By operating the second cylinder, the ground contact portion can be rotated in the vertical direction around the second pivot axis relative to the first rotating plate and the triangular rotating piece. This field work device is characterized by this configuration.

3. 3. A field work device according to claim 1 or 2, characterized in that the work machine body is provided with a leveling plate mounting frame extending horizontally in the width direction, and leveling plates are attached to the leveling plate mounting frame at intervals in the longitudinal direction.

4. 3. The field work apparatus according to claim 2, wherein a tine mounting frame rod extending horizontally in the width direction is fixed to the first pivot plate and the triangular pivot piece, and the tines are attached to the tine mounting frame rod at intervals in the longitudinal direction.

5. 3. The field work implement according to claim 1, wherein the ground-contacting wheels are either pressure wheels or tire wheels.

6. The work machine body is provided with an oil tank for supplying oil to the first cylinder and the second cylinder, a hydraulic pump, a switching valve device, and a control device for controlling the switching valve device, A transmission shaft is disposed between the hydraulic pump and the tractor's PTO shaft to transmit power from the tractor to the hydraulic pump.

3. The field work apparatus according to claim 1, wherein the control device is configured as a means for sending a switching control signal to the switching valve device based on an operation signal from an operation unit provided on the tractor side and height measurement data from a laser height measuring device or a GPS positioning device.

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