JP7521826B2 - Rotatable and detachable rotavator with integrated harrow - Google Patents

Description

The present invention relates to a rotavator that is attached to a tractor or tilling equipment, and more specifically to a rotavator with an integrated harrow that can rotate and lift the harrow and is also detachable.

Rotavators are generally attached to tractors or tilling equipment, and are primarily used at the beginning of agricultural work to prepare land by using PTO power to rotate the blades while attached to the tractor and moving around, cutting or digging up the soil.

Here, land consolidation involves tilling the soil to a depth of about 100 to 200 mm to restore the soil's alkalinity, while also restoring the soil's breathability and drainage properties and including covering the soil with soil to remove parasite eggs, etc.

In general, a rotavator is made up of a frame that is connected to the rear of a tractor so that it can be raised and lowered, a rotary shaft connected to the bottom of the frame and driven by the tractor's power transmission joint, a number of rotary blades installed at regular intervals on the rotary shaft, and grading panels that level the rice fields and fields dug up by the rotary blades. The frame is raised and lowered by a hydraulic cylinder connected to a link mechanism for connecting it to the rear of the tractor, and the rotary blades are connected to a PTO (power take off) attached to the tractor's transmission and driven by the engine driving force.

Therefore, a rotavator with this configuration is mounted on the rear of a tractor, and the rotary blade connected to the tractor's power transmission joint rotates at high speed, allowing it to perform tilling work by digging up the soil in rice fields and other fields. Also, by inserting the rotary blade into the bottom of the rice field at a certain depth and rotating it at high speed to dig up the bottom of the field, the rotavator can be dragged by the tractor, turning the entire rice field into a flat, muddy, and unbent state so that seedlings can be planted.

The applicant has previously filed an application for Korean Patent Application No. 2021-0065553 dated May 21, 2021 for a folder-type rotavator in which the first and second tilling sections are configured to be folded upright from both the left and right sides of the top master so that the rotavator can be quickly moved to the desired tilling position.

The structure of this folder-type rotavator is explained below with reference to Figure 1.

Figure 1 shows a conventional folder-type rotavator filed by the applicant, where Figure 1a shows a schematic configuration of the folder-type rotavator, Figure 1b shows the first tilling section of the folder-type rotavator in a folded state, and Figure 1c shows the first and second tilling sections of the folder-type rotavator in a folded state.

The folder-type rotavator includes a first tilling section 20 and a second tilling section 20' that are configured to be folded and stand up when connected to the rear of a tractor to move to a location for tilling work. The first tilling section 20 and the second tilling section 20' are respectively connected to the left and right sides of a top master 10 that includes a drive transmission 11 so that they can rotate and be driven.

The first tilling section 20 and the second tilling section 20' are configured to rotate in both directions of the top master 10 and be folded up so that they can be erected. For this purpose, a retractable cylinder arm 24 is provided between the ends of each tilling section 20, 20', for example between one side of each drive shaft 23, from both sides of the top master 10.

The first tilling section 20 and the second tilling section 20' are raised by the contraction of the cylinder arm 24, centered on the pivot shaft 13 provided at both ends of the top master 10. The first tilling section 20 and the second tilling section 20' can be kept raised together with the cylinder arm 24 through a support base 26, one side of which is connected to the pivot shaft 13 and the other side of which is fixed to the upper ends of the first tilling section 20 and the second tilling section 20'.

In the drawings, the unexplained reference number '21' indicates a 'grading board' for grading rice fields.

The applicant also filed a Korean patent application No. 2017-0043116 on April 3, 2017 for a rotavator with an integrated hoe, which was registered as Patent No. 1897671.

As is well known, a harrow is an agricultural tool used to break up clods of soil in fields or rice paddies or to level the ground during tillage work, such as cutting or digging up the soil in rice paddies or other fields, using the axial force of a tractor. It is mainly used for leveling rice paddies for rice planting, and is generally attached to the rear of a tractor.

In the applicant's Korean Patent Application No. 2017-0043116, a new type of rotavator was provided that combines a rotavator and a harrow into one unit, allowing rice paddy leveling work to be performed simultaneously with tilling work using the rotavator.

However, with this type of rotavator with integrated hoe, the tip of the hoe is fixed, which reduces the hoe's ability to level the ground when leveling the ground. In addition, soil tends to flow into and accumulate in the hoe itself, making it highly likely that the hoe plate will malfunction, and causing problems with the movement of the rotavator when not leveling the ground.

In particular, when tilling the soil in rice fields, foreign objects such as straw often come to the surface, causing a lot of trouble for workers when planting rice. This necessitates additional work, such as burying the foreign objects below ground during the paddy field leveling work that is carried out at the same time as tilling.

The present invention was developed to solve the problems described above, and its purpose is to provide a rotavator structure with an integrated hoe that is equipped with a hoe rotation means so that the hoe can be lifted upward when not being used for leveling work and can be easily attached and detached as needed.

Another object of the present invention is to provide a rotavator structure with a hoe that has a foreign object removal means for burying foreign objects such as straw that come above the ground during paddy field leveling work.

In one embodiment of the present invention to achieve the above object, a rotavator with integrated hoe is provided that can rotate and lift the hoe and can also be detached. The hoe section for ground leveling is integrally connected to the lower end of the ground leveling plate, and the hoe section includes foreign object removal means for burying foreign objects such as straw under the ground during ground leveling, hoe rotation means for lifting the hoe upward when ground leveling is not being performed, and hoe detachment means.

In the present invention, the foreign object removal means comprises an U-shaped wire, and the hoe plate is formed with a number of fitting holes into which the vertical portions of the U-shaped wire are fitted, and a number of protrusions for supporting the horizontal portions of the wire protrude from the surface of the hoe plate between each fitting hole, and the protrusions have an inclined structure in which they become gradually higher and wider from top to bottom, and the horizontal portions of the wire are bent at their middle portions to protrude , and the bent middle portions have a trapezoidal shape so as to fit closely against each protrusion of the hoe plate and not cause back and forth shaking.

The hoe rotation means includes a lifting cylinder that is extendably installed on the upper end of each of the leveling plates of the first tilling unit and the second tilling unit to enable the hoe unit to rotate up and down, one end of which is hinged to the hoe side end of the pivoting arm that connects the leveling plate and the upper end of the hoe unit, and a hoe fixing device configured to fix the leveling plate and the hoe unit in both directions of the lifting cylinder so that the hoe unit can be raised and lowered by operating the lifting cylinder, and the other end of the pivoting arm is hinged to the leveling plate, and the pivoting arm has a rounded structure.

Here, the harrow fixing device includes an operating handle that is inserted into multiple support brackets fixed to the leveling board, and multiple fastening members that are engaged with the operating handle to connect the leveling board and the harrow section, and the operating handle is configured by two rods of different lengths connected in a U-shape so as to have a handle , and the long rod is inserted into and supported by at least three support brackets fixed to the leveling board, and the short rod is inserted into a first bracket that is located closest to the lifting cylinder among the support brackets through which the long rod passes, and the first bracket has a passing hole that is a hole through which the tip of the short rod passes, and another mounting hole in which the tip of the short rod is mounted in an engaged state so that the long rod is pulled distally from the lifting cylinder .

In addition, the fastening member includes a fixed link portion fixed to the hoe portion near the third bracket which is located furthest from the lifting cylinder among the support brackets through which the long rod passes, and through which the tip of the long rod of the operating handle is clamped , and a hook link portion which is rotatably hinged to the hoe portion near the second bracket between the first bracket and the third bracket, and which is releasably engaged with the long rod of the operating handle, and the operating handle is elastically supported between the first bracket and the second bracket with a coil spring wound around the surface of the long rod, and is configured so that the short rod can be rotated around the long rod as an axis by pulling the handle of the operating handle.

With the above-mentioned features, the present invention can eliminate the problem of impediments to the movement of the rotavator by lifting the hoe upward using the hoe rotating means when not performing ground leveling work. In addition, when necessary, the hoe can be easily attached and detached through simple operations together with the hoe rotating means.

In addition, the present invention uses a foreign object removal means to bury foreign objects such as straw that rise to the surface of the ground during the tilling work, making it possible to maintain a clean site after the work is completed.

FIG. 2A shows the configuration of the applicant's conventional folder-type rotavator and its different operating states (a, b, c). FIG. 2 shows the configuration of the applicant's conventional folder-type rotavator and its different operating states (a, b, c) (b). 1A and 1B are diagrams showing the configuration of the applicant's conventional folder-type rotavator and (c) each of different operating states (a, b, c). 1 is a perspective view showing the overall configuration and external appearance of a rotavator integrated with a harrow according to the present invention; FIG. 3 is a front view of the integrated rotavator with harrow shown in FIG. FIG. 3 is a rear view of the hoe-integrated rotavator of FIG. 2 . FIG. 3 is an enlarged perspective view showing the configuration of a harrow section provided in the harrow-integrated rotavator of FIG. 2 . FIG. 3 is a perspective view showing a state before operation of the harrow rotating means provided in the harrow-integrated rotavator of FIG. 2. FIG. 3 is a front view showing a state before operation of the harrow rotating means provided in the harrow-integrated rotavator of FIG. 2. FIG. 3 is a side view showing a state before operation of the harrow rotating means provided in the harrow-integrated rotavator of FIG. 2. FIG. 3 is a perspective view showing a state after operation of the harrow rotating means provided in the harrow-integrated rotavator of FIG. 2 . FIG. 3 is a plan view showing a state after operation of the harrow rotating means provided in the harrow-integrated rotavator of FIG. 2 . FIG. 3 is a side view showing a state after operation of the harrow rotating means provided in the harrow-integrated rotavator of FIG. 2 .

Figure 2 shows the general external appearance of the rotavator with integrated hoe according to the present invention, showing the rear of the rotavator. Figure 3a is a front view showing the front structure of the rotavator with integrated hoe according to the present invention, and Figure 3b is a rear view showing the rear structure of the rotavator with integrated hoe.

As shown in the figure, the rotavator is in a state in which the first tilling unit 20" located on one side of the top master 10 is raised by the operation of the cylinder arm 24. Here, it can be seen that a hoe unit 40 for paddy field leveling work is attached to the lower ends of the leveling plates 21 of the first tilling unit 20" and the second tilling unit 20''', and each hoe unit 40 is equipped with a foreign object removal means 50 for burying foreign objects such as straw during paddy field leveling work. According to the present invention, the leveling plates 21 of the first tilling unit 20" and the second tilling unit 20'' come into contact with the ground to perform paddy field leveling work. The additional installation of the hoe section 40 at the bottom end of the leveling board allows it to be inserted deeper into the ground during paddy field leveling work, making it possible to more efficiently perform the leveling work and the removal of foreign objects at the same time. For this reason, the hoe section 40 can be installed at an angle to the direction of movement of the rotavator at the bottom end of the rear surface of the leveling board 21. Furthermore, as will be explained in Figure 6 below, even when the hoe section 40 is separated from the leveling board 21, the rotavator of the present invention does not have any negative effect on paddy field leveling work, since the leveling board 21 always remains in contact with the ground.

On the other hand, Figures 2 and 3 show an example in which the technical concept of the present invention is applied to a folding folder-type rotavator, which is one embodiment of the invention. The present invention is not limited to application to such folding folder-type rotavators, and can of course also be applied to rotavator structures having a single tilling section. The configuration of the hoe section 40 and the foreign object removal means 50 will be described with reference to Figure 4.

Figure 4 shows an enlarged view of the structure of the hoe section installed at the lower end of the rear surface of the ground leveling board. The hoe section 40 is equipped with a foreign object removal means 50 for burying foreign objects such as straw that come above ground during paddy field leveling work.

The foreign object removal means 50 is made of a wire-like elastic body, and in order to install the foreign object removal means, a number of fitting holes 43 are formed at regular intervals in the hoe plate 41, and a number of protrusions 42 for supporting the foreign object removal means 50 protrude in the vertical direction of the hoe plate 41 between the fitting holes 43. It is preferable that such protrusions 42 have a generally pyramidal, inclined structure that becomes gradually higher and wider from the top to the bottom.

The foreign object removal means 50 has an ∩-shaped form, and the vertical parts 52 on both sides of the ∩ are configured to fit into the fitting holes 43 located on both sides of the protrusion 42 of the hoe plate 41. As shown in FIG. 4, the vertical part 52 is fitted from the lower end of the vertical part 52 from the rear side to the front side of the rotavator, and at this time, the vertical part 52 that has passed through the fitting hole 43 descends while being in close contact with the inclined front surface (not shown) of the hoe plate 41 as shown in the figure, and is installed so as to be exposed toward the rear surface of the hoe plate 41. To enable such installation, the foreign object removal means 50 has a form in which the middle part 51a of the horizontal part 51 is bent vertically upward as shown in FIG. 4, and it is preferable that this bent part 51a (middle part) has a roughly trapezoidal shape so as to be in close contact with each protrusion 42 of the hoe plate 41.

The foreign object removal means 50 configured in this manner slides along the rotor blade during ground leveling work using the hoe section 40, gathering up foreign objects such as straw exposed on the ground and burying them below ground. During this process, the foreign object removal means 50 adheres closely to each protrusion 42 of the hoe plate 41 because the folded portion 51a of the horizontal section 51 has a trapezoidal shape, and can maintain a stable connection without rocking back and forth, thereby smoothly burying the foreign objects.

The hoe-integrated rotavator of the present invention further includes a hoe rotation means configured to lift the hoe section upward when not performing land leveling work so as not to interfere with tilling work.

Such a hoe rotation means will be described in detail with reference to Figures 4 and 5.

Figure 5 shows the state before operation of the hoe rotation means provided in the hoe-integrated rotavator of the present invention, with the hoe part facing the ground for paddy field leveling work using the hoe.

As shown in the figure, the upper end 44 of the hoe unit 40 is connected by a lifting cylinder 70 so that it can rotate up and down. The lifting cylinder 70 is one element constituting the hoe rotation means, and its main body is installed at the upper end of the ground leveling board 21. One end is hinged to the hoe side end 72 (fastening part) of the rotating arm 71 that connects the upper end of the ground leveling board 21 and the harrow unit 40, and the other end 73 (hinge part) of the rotating arm 71 is hinged to be rotatable to the ground leveling board 21. Due to this type of connection, the harrow unit 40 is lowered by the extension of the lifting cylinder 70 during ground leveling work and maintains a state of touching the ground (see Figure 5c), and maintains a state of being lifted upward by the contraction of the lifting cylinder 70 when ground leveling work is not being performed (see Figure 6c). To facilitate the raising and lowering of the hoe section 40 by the lifting cylinder 70, it is preferable that the pivot arm 71 have a rounded structure as shown in FIG. 4.

As another element constituting the hoe rotation means, the present invention provides a hoe fixing device 60 configured to fix the leveling plate 21 and the hoe section 40 in both directions of the lifting cylinder 70 so that the hoe section 40 can be raised and lowered by the operation of the lifting cylinder 70.

The hoe fixing device 60 includes an operating handle 61 that is inserted into a plurality of support brackets 211, 211', 212 fixed to the leveling board 21, and a plurality of fastening members 45a, 45b that are engaged with the operating handle 61 so as to connect the leveling board 21 and the hoe section 40.

The operating handle 61 is made up of two rods of different lengths each having a U-shaped handle, with one rod 61a extending longer than the other rod 61b. The long rod 61a is inserted and supported in at least three support brackets 211, 211', 212 fixed to the leveling board 21, and the short rod 61b is inserted into the first bracket 212 located closest to the lifting cylinder among the support brackets through which the long rod passes. The first bracket 212 has one hole 212a (hereinafter referred to as the 'passing hole') through which the end of the short rod 61b passes, and another recessed hole 212b (hereinafter referred to as the 'fixing hole') in which the end of the short rod 61b is fixed in an engaged state so that the long rod 61a is pulled proximally relative to the lifting cylinder 70 .

The fastening members 45a, 45b include a ring-shaped fastening member 45a (hereinafter referred to as the ' fixed link portion') through which the long rod 61a of the operating handle 61 passes, provided near the third bracket 211 which is located furthest from the lifting cylinder 70 among the support brackets through which the long rod 61a passes, and a hook-shaped fastening member 45b (hereinafter referred to as the ' hook link portion ' ) which is rotatably hinged to the harrow portion and releasably engaged with the long rod 61a of the operating handle 61, provided near the second bracket 211' between the first bracket 212 and the third bracket 211.

Preferably, the operating handle 61 is elastically supported between the first bracket 212 and the second bracket 211' with the coil spring s wound around the surface of the long rod 61a, so that the short rod 61b can be rotated around the axis of the long rod 61a by pulling the handle of the operating handle 61. When the handle of the operating handle 61 is pulled, the coil spring s is compressed, and after rotating the short rod 61b, when the handle is released, the coil spring s returns to its original state.

According to the present invention, when the handle of the operating handle 61 is pulled to rotate the short rod 61b, the long rod 61a of the operating handle 61 is configured to come out of the third bracket 211 and the fixed link part 45a and to be released. In this case, the short rod 61b of the operating handle 61 comes out of the through hole 212a and is configured to be elastically supported by the coil spring s on the surface of the long rod 61a while being engaged with the mounting hole 212b.

5a to 5c, in the rotavator with integrated hoe of the present invention, when the hoe part 40 is used for ground leveling, the lifting cylinder 70 extends and the pivot arm 71 pivots downward, so that the hoe part 40 descends and maintains a state of contact with the ground (see FIG. 5c), and the hoe fixing device 60 is fixed with the long rod 61a of the operating handle 61 passing through the first, second and third brackets 211, 211', 212 and the fixed link part 45a, and with the short rod 61b of the operating handle 61 inserted into the through hole 212a, the hook link part 45b is engaged with the long rod 61a of the operating handle 61, so that the fixed state is maintained (see FIG. 5b). As a result, the hoe part 40 can stably perform ground leveling work while being fixed to the lower end of the ground leveling board 21.

Figure 6 shows the state after operation of the hoe rotation means provided in the hoe-integrated rotavator of the present invention, showing the operating state for lifting the hoe upward when not performing ground leveling work.

6a to 6c, when the hoe-integrated rotavator of the present invention is not used for ground leveling work using the hoe section 40, first, the hook link section 45b of the hoe fixing device 60 is released from the long rod 61a of the operating handle 61, and the handle of the operating handle 61 is pulled to release the long rod 61a of the operating handle from the third bracket 211 and the fixed link section 45a, and the short rod 61b of the operating handle 61 is released from the through hole 212a to be released. In this state, the short rod 61b of the operating handle 61 is rotated around the long rod 61a of the operating handle 61 as an axis, and the end of the short rod 61b is engaged in the mounting hole 212b while being elastically supported by the coil spring s on the surface of the long rod 61a, so that the mounting state is maintained (see Figs. 6a to 6b). For this reason, it is preferable that the diameter of the mounting hole 212b is smaller than that of the passage hole 212a so that the short rod 61b of the operating handle 61 does not pass through it but simply maintains the mounted state.

As a result, the hoe section 40 is released from its fixed state to the lower end of the rear surface of the ground leveling plate 21, and becomes rotatable around the hinge section 73 of the pivot arm 71.

Even in this way, as shown in 6c, when the lifting cylinder 70 contracts, the hoe section 40 can be maintained in a lifted state above the ground around the hinge section 73 by the pivoting arm 71 rotating upward.

Meanwhile, in this configuration, the hoe-integrated rotavator of the present invention is configured so that the hoe section 40 can be separated as necessary, and after completing the release operation of the hoe fixing device 60 described in FIG. 6, the present invention makes it possible to easily separate the hoe section 40 by releasing the connections at the fastening section 72 and hinge section 73 of the pivot arm 71 that respectively connects the leveling plate 21 and the lifting cylinder 70 to the hoe section 40.

Although the present invention has been described in detail or with reference to specific embodiments, the present invention is not limited to the above-described embodiments. Therefore, it is clear to those skilled in the art that various changes and modifications can be made within the scope of the claims of the present invention without departing from the technical idea and spirit of the invention.

10 Top master 20" First tilling section 20"' Second tilling section 21 Leveling plate 211, 211' 212 Support bracket 212a Passing hole 212b Mounting hole 24 Cylinder arm 40 Harrow section 41 Harrow plate 43 Fitting hole 42 Protrusion 45a Fastening member ( fixed link section )
45b Fastening member ( hook link portion )
50 Foreign object removing means 51 Horizontal portion 51a Bending portion 52 Vertical portion 60 Harrow fixing device 61 Operation handle 61a Long rod 61b Short rod 70 Lifting cylinder 71 Rotating arm 72 Fastening portion 73 Hinge portion s Coil spring

Claims (5)

A hoe-integrated rotavator in which a hoe section for grading work is integrally connected to the lower end of a ground leveling plate,
The hoe section includes a hoe rotating means for lifting the hoe plate upward when not performing ground leveling work,
The harrow rotating means is
A pivot arm that connects the leveling board and the upper end of the hoe part;
a lifting cylinder that is telescopically installed on the upper end of the leveling board and has one end hinged to the hoe side end of the pivot arm;
A hoe fixing device configured to fix the ground leveling plate and the hoe part on both the left and right sides of the lifting cylinder,
The hoe-integrated rotavator is characterized in that the hoe fixing device includes an operating handle that is inserted into a plurality of support brackets fixed to the leveling plate, and a plurality of fastening members that are engaged with the operating handle so as to connect the leveling plate and the hoe section. The rotavator with integrated harrow as described in claim 1 , characterized in that the operating handle is formed by connecting two rods of different lengths in a U-shape to have a handle, the long rod is inserted and supported in at least three support brackets fixed to the leveling board, and the short rod is inserted into a first bracket located closest to the lifting cylinder among the support brackets through which the long rod passes, and the first bracket has a passing hole through which the end of the short rod passes and another recessed mounting hole in which the end of the short rod is mounted in an engaged state so that the long rod is pulled proximally relative to the lifting cylinder . The fastening member includes a fixed link portion fixed to the harrow portion near the third bracket located furthest from the lifting cylinder among the support brackets through which the long rod passes, and clamps the tip of the long rod of the operating handle, and a hook link portion rotatably hinged to the harrow portion near the second bracket between the first bracket and the third bracket, and releasably engaged with the long rod of the operating handle, and the operating handle is elastically supported between the first bracket and the second bracket with a coil spring wound around the surface of the long rod, and is configured so that the short rod can be rotated around the long rod as an axis by pulling the handle of the operating handle. 2. The rotavator with integrated hoe as described in claim 1, further comprising a foreign object removal means for burying foreign objects such as straw under the ground during ground leveling work, the foreign object removal means being made of an U-shaped wire, the hoe plate having a number of fitting holes into which the vertical parts of the U-shaped wire are fitted, and a number of protrusions for supporting the horizontal parts of the wire protruding from the surface of the hoe plate between each fitting hole, the protrusions having an inclined structure in which they become gradually higher and wider from the top to the bottom. The rotavator with integrated hoe as described in claim 4, characterized in that the horizontal portion of the wire is bent at its middle portion to protrude , and the bent middle portion has a trapezoidal shape so as to fit closely to each protrusion of the hoe plate and not cause back and forth shaking.