A rotary tillage device and a ridging apparatus

Abstract

The utility model discloses a kind of rotary tiller and ridge making equipment, rotary tiller includes frame and two rotary tiller mechanism, each rotary tiller mechanism includes tool shaft and multiple rotary tiller groups, tool shaft both ends are rotatably connected with frame, multiple rotary tiller groups are connected with the circumferential side of tool shaft respectively, multiple rotary tiller groups are spaced along the axial direction of tool shaft, rotary tiller group includes symmetrically arranged first plough and second plough, first plough includes first tool body and first blade tip that is bent and extends from first tool body, the extension direction of first blade tip is towards the direction of tool shaft axis, second plough includes second tool body and second blade tip that is bent and extends from second tool body, the extension direction of second blade tip is towards the direction of tool shaft axis, first tool body and second tool body are all arc structure. Ridge making equipment applies the above-mentioned one kind of rotary tiller, adopts first tool body and second tool body of arc structure, with good structural strength.

Description

Technical Field

[0001] This utility model relates to the field of land rotary tillage and ridging production technology, and in particular to a rotary tillage device and ridging equipment. Background Technology

[0002] In southern my country, potatoes are mostly grown in heavy, clayey soils with high moisture content. These soils are characterized by their heavy texture, poor aeration, and tendency to waterlogging. To ensure potato growth, the land needs to be rotary tilled before planting to loosen and refine the soil before ridging. Rotary tillage involves using rotary blades to cut and break up compacted soil, breaking down its clay structure, increasing soil porosity, and improving aeration and water retention. It also mixes crop residues and weeds into the soil to increase organic matter content, providing a loose and fertile soil foundation for seed potato growth. Ridging, on the other hand, raises the ridge height, accelerating drainage and reducing soil moisture, thus ensuring the yield and quality of potatoes grown in southern regions. Existing rotary tillage devices are inefficient in the ridging stage and produce insufficient ridge height. While longer blades can improve tillage efficiency, they are prone to breakage, resulting in poor reliability. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a rotary tillage device and a ridging device, wherein the ridging device utilizes a rotary tillage device provided in this application. The rotary tillage device employs a first and second blade with an arc-shaped structure, possessing good structural strength and resistance to bending, breakage, and fatigue, meeting the strength requirements for longer blade dimensions, thereby increasing the depth of rotary tillage operations through the longer blade dimensions.

[0004] In a first aspect, a rotary tillage device according to an embodiment of the present utility model includes: frame; Two rotary tillage mechanisms are provided, each including a cutter shaft and multiple rotary tillage blade sets. The two ends of the cutter shaft are rotatably connected to the frame, and the multiple rotary tillage blade sets are respectively connected to the periphery of the cutter shaft. The multiple rotary tillage blade sets are spaced apart along the axial direction of the cutter shaft. Each rotary tillage blade set includes a first tillage blade and a second tillage blade symmetrically arranged. The first tillage blade includes a first blade body and a first blade tip extending from the first blade body. The extension direction of the first blade tip is towards one direction of the cutter shaft axis. The second tillage blade includes a second blade body and a second blade tip extending from the second blade body. The extension direction of the second blade tip is towards the other direction of the cutter shaft axis. Both the first and second blade bodies have an arc-shaped structure.

[0005] A rotary tillage device according to an embodiment of the present utility model has at least the following beneficial effects: Both the first and second blades employ an arc-shaped structure, possessing excellent structural strength and resistance to bending, breakage, and fatigue. This significantly enhances the overall reliability and service life of the first and second blades, making it possible to use longer blades. The longer blades can penetrate deeper into more compact soil layers for effective cutting and breaking, perfectly meeting the specific agronomical requirements of high ridging and deep loosening before planting root crops such as potatoes and sweet potatoes. By configuring two parallel rotary tillage mechanisms and rationally arranging multiple rotary tillage blade sets along the axial direction on the blade shaft of each mechanism, the tillage width is increased, enabling large-area soil rotary tillage operations to be completed in one go. This greatly improves the work efficiency per unit time, meeting the demands of modern large-scale agriculture for high-efficiency production. The first and second blades are each equipped with a tip extending from the bent blade body, and the bending directions of the first and second blade tips are opposite. This allows a single blade assembly to simultaneously perform balanced and powerful insertion, cutting, and turning actions on the soil on both sides of the cross-section where the blade body is located during rotation. This avoids the problem of uneven tillage caused by unidirectional soil displacement, and also significantly enhances the soil's breakage, looseness, and turning effect, thereby improving the working quality and efficiency of the rotary tillage device.

[0006] According to an embodiment of the present invention, a rotary tillage device has a first blade with an arc-shaped structure, which includes an arc-shaped side and a straight side disposed opposite to each other; the second blade with an arc-shaped structure also includes an arc-shaped side and a straight side disposed opposite to each other.

[0007] According to an embodiment of the present invention, a rotary tillage device has first reinforcing ribs on both sides of the first blade body along the blade shaft axis; and first reinforcing ribs are also provided on both sides of the second blade body along the blade shaft axis.

[0008] According to an embodiment of the present utility model, a rotary tillage device has multiple mounting seats spaced apart around the blade shaft, and the first and second tillage blades of multiple rotary tillage blade sets are detachably connected to the multiple mounting seats respectively.

[0009] According to an embodiment of the present utility model, a rotary tillage device is provided on each mounting base, and the end of the first blade away from the first blade tip can be matched and inserted into the mounting hole, with one first blade corresponding to one mounting hole of the mounting base; the end of the second blade away from the second blade tip can be matched and inserted into the mounting hole, with one second blade corresponding to one mounting hole of the mounting base.

[0010] According to an embodiment of the present invention, in a rotary tillage device, two adjacent rotary tillage blade sets are staggered at a certain angle along the circumference of the blade shaft.

[0011] According to an embodiment of the present invention, a rotary tillage device further includes a tillage plow, which is installed on the front side of the lower part of the frame and is located between two rotary tillage mechanisms.

[0012] According to an embodiment of the present utility model, a rotary tillage device includes a tillage body and a tillage tip, the tillage tip being connected to the lower end of the tillage body and having a flat triangular structure.

[0013] Secondly, according to an embodiment of the present utility model, a ridging device applies the above-mentioned rotary tillage device and further includes a ridging plow, which is disposed behind the rotary tillage mechanism.

[0014] According to an embodiment of the present utility model, in a ridging device, the bottom end of the ridging plow and the bottom end of the rotary tillage mechanism are at the same vertical height.

[0015] Both the first and second blades employ an arc-shaped structure, possessing excellent structural strength and resistance to bending, breakage, and fatigue. This significantly enhances the overall reliability and service life of the first and second blades, making it possible to use longer blades. The longer blades can penetrate deeper into more compact soil layers for effective cutting and breaking, perfectly meeting the specific agronomical requirements of high ridging and deep loosening before planting root crops such as potatoes and sweet potatoes. By configuring two parallel rotary tillage mechanisms and rationally arranging multiple rotary tillage blade sets along the axial direction on the blade shaft of each mechanism, the tillage width is increased, enabling large-area soil rotary tillage operations to be completed in one go. This greatly improves the work efficiency per unit time, meeting the demands of modern large-scale agriculture for high-efficiency production. The first and second blades each have a tip extending from their bent blade bodies, with the bending directions of the first and second tips opposite. This allows a single blade assembly to simultaneously and powerfully insert, cut, and turn the soil on both sides of the blade's cross-section during rotation, avoiding uneven tillage caused by unidirectional soil displacement. It also significantly enhances soil breakage, looseness, and turning effect, improving the working quality and efficiency of the rotary tiller. Rotary tillage of deep soil facilitates ridging, raising the ridge height, reducing soil moisture, and increasing potato yield and quality in southern regions.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a side view of a rotary tillage device and a ridging plow according to an embodiment of the present utility model. Figure 2 This is a front view structural diagram of a rotary tillage device according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the cutter shaft and rotary blade assembly of a rotary tillage device according to an embodiment of the present utility model; Figure 4 This is a partial exploded view of the cutter shaft and rotary blade assembly of a rotary tillage device according to an embodiment of the present utility model; Figure 5 This is a side view of the tillage plow of a rotary tillage device according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: Frame 100; Power Output Module 110; 200 cutter shaft; 210 mounting base; 220 mounting hole; Rotary tillage blade assembly 300; first tillage blade 310; first blade body 311; first blade tip 312; second tillage blade 320; second blade body 321; second blade tip 322; first reinforcing rib 330; Tillage plow 400; plow body 410; plow tip 420; second reinforcing rib 430; 500 ridging plows. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of a utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first" and "second" are used, they are merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or the order of the indicated technical features.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] Existing rotary tillage devices are inefficient in the ridging stage and the ridging height is insufficient. Using longer tillage blades can improve tillage efficiency, but longer tillage blades are prone to breakage and have poor reliability.

[0024] Reference Figures 1 to 5 This utility model embodiment provides a rotary tillage device, including a frame 100 and a rotary tillage mechanism. Two rotary tillage mechanisms are provided, each including a blade shaft 200 and multiple rotary tillage blade sets 300. The two ends of the blade shaft 200 are rotatably connected to the frame 100. The multiple rotary tillage blade sets 300 are respectively connected to the periphery of the blade shaft 200 and are spaced apart along the axial direction of the blade shaft 200. Each rotary tillage blade set 300 includes a symmetrically arranged first tillage blade 310 and a second tillage blade 310. The first tillage blade 310 includes a first blade body 311 and a first blade tip 312 extending from the first blade body 311. The extension direction of the first blade tip 312 is towards one direction of the axis of the blade shaft 200. The second tillage blade 320 includes a second blade body 321 and a second blade tip 322 extending from the second blade body 321. The extension direction of the second blade tip 322 is towards the other direction of the axis of the blade shaft 200. Both the first blade body 311 and the second blade body 321 have an arc-shaped structure.

[0025] Specifically, the frame 100 is also equipped with a power output module 110, and the cutter shafts 200 of the two rotary tillage mechanisms are respectively connected to the power output module 110 for transmission. (Refer to...) Figure 2 The power output module 110 includes a transmission chain and a drive component, which is connected to the two cutter shafts 200 via the transmission chain. The drive component can be an electric motor, a fuel motor, or other device capable of providing rotational output force.

[0026] Specifically, refer to Figure 2 and Figure 3 The first tillage blade 310 and the second tillage blade 320 are arranged symmetrically along the radial direction of the blade shaft 200. That is, when the first tillage blade 310 is above the blade shaft 200, the second tillage blade 320 is below the blade shaft 200; when the first tillage blade 310 is in front of the blade shaft 200, the second tillage blade 320 is behind the blade shaft 200. (Refer to...) Figure 2 and Figure 3 The first blade 310 and the second blade 320 of each rotary tiller blade assembly 300 are connected to the same cross-section along the axial direction of the blade shaft 200, that is, on the same cross-section in the left-right direction.

[0027] Specifically, the bending direction of the first blade tip 312 is opposite to the bending direction of the second blade tip 322, as shown in the reference. Figure 3 The first blade tip 312 bends to the right, and the second blade tip 322 bends to the left.

[0028] Specifically, refer to Figure 2 The two rotary tillage mechanisms are arranged side by side at intervals along the left and right directions.

[0029] Compared to existing tillage blade structures, the first blade 311 and the second blade 321 of this invention both adopt an arc-shaped structure, possessing excellent structural strength and resistance to bending, breakage, and fatigue. This significantly improves the overall reliability and service life of the first blade 311 and the second blade 321, making it possible to use longer blades. Longer blades can penetrate deeper into more compact soil layers for effective cutting and breaking, perfectly meeting the specific agronomical requirements of high ridging and deep loosening before planting root crops such as potatoes and sweet potatoes. By configuring two parallel rotary tillage mechanisms and rationally arranging multiple rotary tillage blade sets 300 along the axial direction on the blade shaft 200 of each mechanism, the tillage width is increased, enabling large-area soil rotary tillage operations to be completed in one go. This greatly improves the work efficiency per unit time, meeting the demands of modern large-scale agriculture for high-efficiency production. The first blade 310 and the second blade 320 are each provided with a blade tip extending from the bent blade body. The bending directions of the first blade tip 312 and the second blade tip 322 are opposite, so that when a single blade assembly rotates, it can simultaneously perform balanced and powerful insertion, cutting and turning actions on the soil on both sides of the cross-section where the blade body is located. This avoids the problem of uneven tillage caused by unidirectional soil displacement, and also significantly enhances the soil's fragmentation, looseness and turning effect, thereby improving the working quality and efficiency of the rotary tillage device.

[0030] According to some embodiments of this application, refer to Figure 1 and Figure 4 The first cutter body 311 with an arc-shaped structure includes an arc-shaped side and a straight side arranged opposite to each other; the second cutter body 321 with an arc-shaped structure also includes an arc-shaped side and a straight side arranged opposite to each other. This further improves the bending resistance, fracture resistance, and fatigue resistance of the first cutter body 311 and the second cutter body 321.

[0031] Furthermore, referring to Figure 4 The first cutter body 311 has first reinforcing ribs 330 on both sides along the axis of the cutter shaft 200; the second cutter body 321 also has first reinforcing ribs 330 on both sides along the axis of the cutter shaft 200. The first reinforcing ribs 330 are used to further improve the structural strength of the first cutter body 311 and the second cutter body 321.

[0032] According to some embodiments of this application, refer to Figures 2 to 4The blade shaft 200 has multiple mounting seats 210 spaced apart on its periphery. The first blades 310 and second blades 320 of the multiple rotary tiller blade sets 300 are detachably connected to the corresponding mounting seats 210. The detachable connection between the multiple first blades 310 and the multiple second blades 320 and the multiple mounting seats 210 facilitates the replacement of first blades 310 and second blades 320 of different sizes, and also facilitates the disassembly and maintenance of the first blades 310 and second blades 320.

[0033] Furthermore, referring to Figure 4 Each mounting base 210 is provided with a mounting hole 220. The end of the first blade 311 away from the first blade tip 312 can be matched and inserted into the mounting hole 220. One first blade 311 corresponds to one mounting hole 220 of the mounting base 210. The end of the second blade 321 away from the second blade tip 322 can be matched and inserted into the mounting hole 220. One second blade 321 corresponds to one mounting hole 220 of the mounting base 210.

[0034] Specifically, refer to Figure 3 and Figure 4 Each mounting base 210 has through holes on both sides along the axial direction of the cutter shaft 200. The first cutter body 311 and the second cutter body 321 also have corresponding through holes along the axial direction of the cutter shaft 200. When the first cutter body 311 and the second cutter body 321 are inserted into the mounting hole 220, bolts can be passed through the through holes of the mounting base 210 and the first cutter body 311 or the second cutter body 321 in sequence. Then, nuts are used to fix the tail of the bolts, so as to realize the detachable connection between the first tiller blade 310, the second tiller blade 320 and the mounting base 210.

[0035] According to some embodiments of this application, refer to Figures 1 to 4 Two adjacent rotary tillage blade sets 300 are staggered at a certain angle along the circumference of the blade shaft 200. Preferably, refer to... Figure 1 Two adjacent rotary tillage blade sets 300 are offset by 45° around the circumference of the blade shaft 200. At the axial angle of the blade shaft 200, multiple rotary tillage blade sets 300 together form a star-shaped structure. During the rotation of the blade shaft 200, the soil can be tilled more evenly, improving tillage quality. It also keeps the reaction force on the blade shaft 200 at a relatively stable amplitude, preventing excessive fluctuations in the reaction force and ensuring the long-term reliable operation of the power output module 110.

[0036] According to some embodiments of this application, refer to Figure 2It also includes a tillage plow 400, which is installed on the front side of the lower part of the frame 100 and is located between the two rotary tillage mechanisms. The tillage plow 400 is used to till the soil between the two rotary tillage mechanisms, which helps to avoid the formation of tillage gaps between the two rotary tillage mechanisms.

[0037] Furthermore, referring to Figure 2 and Figure 5 The tillage plow 400 includes a plow body 410 and a plow tip 420. The plow tip 420 is connected to the lower end of the plow body 410 and has a flat triangular structure. The flat triangular structure of the plow tip 420 has a good tillage effect and can effectively insert into and turn over the soil.

[0038] Understandably, referring to Figure 2 and Figure 5 In some other embodiments, a second reinforcing rib 430 is provided on the front side of the connection between the plow body 410 and the plow tip 420. The second reinforcing rib 430 can improve the reliability of the connection between the plow body 410 and the plow tip 420 as well as the stability of the relative angle between the plow body 410 and the plow tip 420.

[0039] This application also provides a ridging device that utilizes the rotary tillage apparatus of this application, see reference. Figure 1 It also includes a ridging plow 500 and a walking drive mechanism (not shown in the figure). The walking drive mechanism includes a fuel engine, a drive shaft, and wheels. The fuel engine, drive shaft, and wheels are connected in sequence. The ridging plow 500 is located behind the rotary tillage mechanism. Both the ridging plow 500 and the walking drive mechanism are mounted on the frame 100.

[0040] According to some embodiments of this application, refer to Figure 1 The bottom of the ridging plow 500 is at the same vertical height as the bottom of the rotary tillage mechanism. After the rotary tillage mechanism breaks up the soil to a specified depth, the ridging plow 500 can rid the soil located deep inside, improving the quality of ridging and reducing the compaction of soil in the ridge.

[0041] Working principle: The drive component of the power output module 110 drives the two cutter shafts 200 to rotate through the transmission chain. The two cutter shafts 200 drive the multiple rotary tillage blade sets 300 connected to their periphery to rotate relative to each other around the axis of the cutter shafts 200, thereby realizing rotary tillage of the land. The walking drive mechanism drives the frame 100, the ridging plow 500 and the rotary tillage device to move forward. The rotary tillage device first loosens the land by rotary tillage, and then the ridging plow 500 can rid the loosened land.

[0042] Compared to existing tillage blade structures, the first blade 311 and the second blade 321 of this invention both adopt an arc-shaped structure, possessing excellent structural strength and resistance to bending, breakage, and fatigue. This significantly improves the overall reliability and service life of the first blade 311 and the second blade 321, making it possible to use longer blades. Longer blades can penetrate deeper into more compact soil layers for effective cutting and breaking, perfectly meeting the specific agronomical requirements of high ridging and deep loosening before planting root crops such as potatoes and sweet potatoes. By configuring two parallel rotary tillage mechanisms and rationally arranging multiple rotary tillage blade sets 300 along the axial direction on the blade shaft 200 of each mechanism, the tillage width is increased, enabling large-area soil rotary tillage operations to be completed in one go. This greatly improves the work efficiency per unit time, meeting the demands of modern large-scale agriculture for high-efficiency production. The first blade 310 and the second blade 320 are each equipped with a blade tip extending from the bent part of their blade body. The bending directions of the first blade tip 312 and the second blade tip 322 are opposite, allowing the single blade assembly to simultaneously and powerfully insert, cut, and turn the soil on both sides of the cross-section of the blade body during rotation. This avoids uneven tillage caused by unidirectional soil displacement and significantly enhances soil breakage, looseness, and turning effect, improving the working quality and efficiency of the rotary tillage device. Rotary tillage of deep soil facilitates ridging of deep soil by the ridging plow 500, raising the ridge height, thereby reducing soil moisture and improving the yield and quality of potatoes grown in southern regions.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotary tillage device, characterized in that, include: Rack (100); Two rotary tillage mechanisms, each including a cutter shaft (200) and multiple rotary tillage blade sets (300), the two ends of the cutter shaft (200) being rotatably connected to the frame (100), the multiple rotary tillage blade sets (300) being respectively connected to the periphery of the cutter shaft (200), the multiple rotary tillage blade sets (300) being spaced apart along the axial direction of the cutter shaft (200), each rotary tillage blade set (300) including a first tillage blade (310) and a second tillage blade (320) symmetrically arranged, the first tillage blade (310) including a first blade body ( 311) and a first blade tip (312) extending from the first blade body (311), the extension direction of the first blade tip (312) is toward one direction of the axis of the blade shaft (200), the second tillage blade (320) includes a second blade body (321) and a second blade tip (322) extending from the second blade body (321), the extension direction of the second blade tip (322) is toward the other direction of the axis of the blade shaft (200), the first blade body (311) and the second blade body (321) are both in an arc shape.

2. The rotary tillage device according to claim 1, characterized in that, The first cutter body (311) of the bow-shaped structure includes an arc-shaped side and a straight side arranged opposite to each other; the second cutter body (321) of the bow-shaped structure also includes an arc-shaped side and a straight side arranged opposite to each other.

3. A rotary tillage device according to claim 2, characterized in that, The first cutter body (311) is provided with first reinforcing ribs (330) on both sides along the axis of the cutter shaft (200); the second cutter body (321) is also provided with first reinforcing ribs (330) on both sides along the axis of the cutter shaft (200).

4. A rotary tillage device according to claim 1, characterized in that, The blade shaft (200) is provided with a plurality of mounting seats (210) at intervals around its periphery. The first tillage blade (310) and the second tillage blade (320) of the plurality of rotary tillage blade sets (300) are respectively detachably connected to the plurality of mounting seats (210).

5. A rotary tillage device according to claim 4, characterized in that, Each of the mounting bases (210) is provided with a mounting hole (220). The end of the first blade (311) away from the first blade tip (312) can be matched and inserted into the mounting hole (220). One first blade (311) corresponds to one mounting hole (220) of the mounting base (210). The end of the second blade (321) away from the second blade tip (322) can be matched and inserted into the mounting hole (220). One second blade (321) corresponds to one mounting hole (220) of the mounting base (210).

6. A rotary tillage device according to claim 1, characterized in that, The two adjacent rotary tillage blade sets (300) are staggered at a certain angle along the circumference of the blade shaft (200).

7. A rotary tillage device according to claim 1, characterized in that, It also includes a tillage plow (400), which is mounted on the front side of the lower part of the frame (100) and is located between the two rotary tillage mechanisms.

8. A rotary tillage device according to claim 7, characterized in that, The tillage plow (400) includes a plow body (410) and a plow tip (420), the plow tip (420) being connected to the lower end of the plow body (410), and the plow tip (420) having a flat triangular structure.

9. A ridging device, characterized in that, The rotary tillage device includes any one of claims 1 to 8, and further includes a ridging plow (500) disposed behind the rotary tillage mechanism.

10. A ridging device according to claim 9, characterized in that, The bottom end of the ridging plow (500) is at the same vertical height as the bottom end of the rotary tillage mechanism.

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