JP7503463B2 - Paddy field furrow cutting machine's furrow cutting part - Google Patents

Description

The present invention relates to a furrow cutting section of a paddy field furrow cutting machine.

Conventionally, there are known walk-behind and ride-on paddy field furrow cutters that use a furrow cutter to form a roughly V-shaped furrow on the soil surface of a paddy field in order to quickly drain the paddy field. The furrow cutter of these paddy field furrow cutters has left and right side plate parts for forming the left and right side surfaces of the furrow, and a bottom plate part for forming the bottom surface of the furrow, and openings are formed above and behind the left and right side plate parts. In the furrow cutter of the paddy field furrow cutter described in the following Patent Document 1, a cover is provided to cover the upper opening to prevent mud from entering and accumulating in the furrow cutter during furrow cutting work. The left and right ends of this cover are fixed by four bolt connections to left and right upward protruding plate parts connected to the upper parts of the left and right side plate parts.

JP 2008-109901 A

However, in the furrow cutting section of the paddy field furrow cutting machine of Patent Document 1, it was time-consuming to remove the mud that had accumulated on the cover, and when removing mud that had entered and accumulated inside the furrow cutting section through the rear opening, it was necessary to release all the bolt connections and remove the cover, making cleaning inside the furrow cutting section a hassle.

The present invention was made to solve these problems, and aims to provide a furrow cutting section of a paddy field furrow cutting machine that can easily remove mud accumulated on the blocking lid (cover) and can easily clean the inside of the furrow cutting section.

The furrow cutting section (7) of the paddy field furrow cutting machine (100) according to the present invention is provided in the paddy field furrow cutting machine (100) for forming a substantially V-shaped furrow in a paddy field, and is provided with left and right side plate sections (7a, 7b) for forming the left and right side surfaces of the furrow, and is provided with a blocking lid (7x) that closes the opening (7w) in an openable and closable manner in the furrow cutting section (7) formed above the left and right side plate sections (7a, 7b). The blocking lid (7x) is provided on the left side of the furrow cutting section (7). It is characterized in that either the end (7k) or the right end (7v) is rotatably supported on a pivot point (7t) of the upper end (7f) of one of the left and right side plate portions (7a, 7b), and the other end (7k) of the left end (7k) or the right end (7v) of the blocking lid (7x) can be brought into contact with and separated from the upper end (7e) of the other of the left and right side plate portions (7a, 7b).

With this type of furrow cutting section (7) of the paddy field furrow cutting machine (100), the blocking lid (7x) that blocks the upper opening (7w) of the furrow cutting section (7) can be rotated around the pivot point (7t) of the upper end (7f) of one of the left and right side plate sections (7a, 7b) to easily remove mud that has accumulated on the blocking lid (7x). In addition, there is no need for the complicated task of releasing the bolt fastenings of all the covers that block the upper opening, as in the prior art. The blocking lid (7x) can be opened by the simple operation of rotating the blocking lid (7x) around the pivot point (7t), which makes it easy to clean inside the furrow cutting section (7).

Here, a connecting member (7s) is provided that connects the inner part of the other (7a) of the left and right side plate parts (7a, 7b) of the blocking lid (7x) to the inner surface of the blocking lid (7x) and is bent and housed in the groove cut part (7). When the connecting member (7s) is stretched, it regulates the opening angle of the blocking lid (7x), and the blocking lid (7x) can be opened to an angle at which mud on the blocking lid (7x) can be removed. By opening the blocking lid (7x) until the connecting member (7s) is stretched, mud accumulated on the blocking lid (7x) can be easily removed. In addition, the connecting member (7s) can prevent the blocking lid (7x) from opening too far, eliminating the risk of damage to crops caused by the blocking lid (7x).

In addition, if the connecting member (7s) has an elastic force that biases the blocking lid (7x) to close, the blocking lid (7x) can be easily closed by the elastic force of the connecting member (7s).

In addition, if a biasing member (7u) that biases the blocking lid (7x) to close is provided on the part (7m) that rotatably supports the blocking lid (7x), the blocking lid (7x) can be easily closed by the biasing force of the biasing member (7u) provided on the part (7m) that rotatably supports the blocking lid (7x). In addition, the biasing force of the biasing member (7u) can prevent the blocking lid (7x) from opening too far, eliminating the risk of damage to crops caused by the blocking lid (7x).

In addition, if vibration absorbing members (7i, 7j) are interposed between the left end (7k) and the right end (7v) of the blocking lid (7x) and the upper end (7e, 7f) of the left and right side plate portions (7a, 7b) that face the left end (7k) and the right end (7v) of the blocking lid (7x), respectively, the vibrations generated during operation of the paddy field furrow cutting machine (100) can be absorbed, and noise generation and damage can be prevented.

In addition, if there is a fastener for temporarily fixing the other end (7k) of the left end (7k) or the right end (7v) of the blocking cover (7x) to the upper end (7e) of the other (7a) of the left and right side plate portions (7a, 7b), vibration during operation of the paddy field furrow cutter (100) can be suppressed, and noise generation and damage can be prevented.

Specific examples of configurations that can effectively achieve the above-mentioned effect include a configuration in which the blocking lid (7x) is rotatably supported via a hinge (7m) and a handle (7z) is provided on the upper surface of the blocking lid (7x). In this way, an operator can grasp the handle (7z) and easily open the blocking lid (7x) using the pin (7t) of the hinge (7m) as the pivot point.

In this way, the present invention provides a furrow cutting section of a paddy field furrow cutting machine that can easily remove mud accumulated on the blocking lid and can easily clean the inside of the furrow cutting section.

1 is a left side view showing a riding groove cutting machine equipped with a groove cutting unit according to a first embodiment of the present invention. FIG. FIG. 2 is a plan view showing the neutral return mechanism in FIG. 1 . FIG. 2 is a plan view showing a groove portion in FIG. 1 . FIG. 2 is a left side view showing the groove cutting portion in FIG. 1 . FIG. 5 is a cross-sectional view of the groove cutting portion shown in FIGS. 3 and 4 . FIG. 5 is a plan view showing a closing cover of the grooved portion shown in FIGS. 3 and 4 . FIG. 2 is a plan view showing the phase relationship between the wheel and the groove cutting portion, showing a state in which the wheel and the groove cutting portion are located in a neutral position. FIG. 2 is a plan view showing the phase relationship between the wheel and the groove cutting portion, illustrating a state in which the wheel has been turned clockwise from the neutral position. FIG. 11 is a plan view showing the phase relationship between the wheel and the groove cutting portion, illustrating the state in which the wheel has been turned counterclockwise from the neutral position. 6 is a cross-sectional view showing a state in which a closing cover of the groove cutting portion in FIG. 5 is open. FIG. FIG. 6 is a cross-sectional view showing a groove cutting portion according to a second embodiment of the present invention. FIG. 12 is a plan view of the groove cut portion shown in FIG. 11 .

Below, a preferred embodiment of a riding groove cutting machine equipped with a groove cutting section according to the present invention will be described with reference to Figs. 1 to 12. Figs. 1 to 10 show a first embodiment of the present invention, and Figs. 11 and 12 show a second embodiment of the present invention. In each figure, the same elements are given the same reference numerals, and duplicated explanations will be omitted.

First, the first embodiment shown in Figures 1 to 10 will be described. Figure 1 is a left side view showing a riding groove cutting machine equipped with a groove cutting unit according to the first embodiment of the present invention. In the following description, terms indicating directions such as "front," "rear," "up," "down," "left," and "right" are based on the state in which the forward direction of the riding groove cutting machine when placed on a horizontal surface is defined as the forward direction.

As shown in FIG. 1, the riding furrow cutter 100 as a paddy field furrow cutter is provided with a handle 1 extending left and right at the front, the left and right ends of which are gripped by the operator, a handle shaft 2 extending diagonally downward and forward from the lower center of the handle 1, a connecting bracket 3 connected to the lower end of the handle shaft 2, offset toward the front of the page and extending downward at the same inclination as the handle shaft 2, a gear case 4 connected to the connecting bracket 3, wheels 6 connected to the inner hub of the gear case 4 and provided with flat anti-slip pads 5 at equal intervals along the outer periphery, and a furrow cutter 7 for cutting furrows in the soil surface of the paddy field (field) at the rear, and a furrow cutter shaft 8 connected to the furrow cutter 7 and extending diagonally upward and backward.

The riding trencher 100 also has a main frame 9 that extends downward in the fore-and-aft direction. A handle shaft rotation support pipe 10 is provided at the front of the main frame 9, and the handle shaft 2 is inserted into the handle shaft rotation support pipe 10 and connected to it so as to be freely rotatable.

The main frame 9 is provided with a seat 12 at the top, approximately at the center in the axial direction, for the operator to sit astride. The seat 12 can be adjusted in the vertical direction. The rear side of the axial center of the main frame 9 is provided with a curved section 14 that curves in an approximately U-shape, bulging out to the side (toward the back of the page), so that the transmission shaft housing pipe 13 described below can enter and swing left and right (perpendicular to the page) around the handle shaft 2 as the rotation axis. A groove cutting section shaft rotation support pipe 11 is provided at the rear end of the main frame 9 extending rearward from the curved section 14, and the groove cutting section shaft 8 is inserted into the groove cutting section shaft rotation support pipe 11 and connected to it so as to be freely rotatable.

The gear case 4 houses a spiral bevel gear and the like, and a transmission shaft housing pipe 13, which houses a transmission shaft inside and extends in the front-rear direction with the rear raised, is connected to the gear case 4, and the rear end of the transmission shaft housing pipe 13 is connected to the prime mover 15. The transmission shaft housing pipe 13 extends rearward while being slightly inclined to the right (the back of the page) by the spiral bevel gear of the gear case 4. The prime mover 15 is disposed behind the seat 12, and the transmission shaft housing pipe 13 is disposed so that it passes under the seat 12, passes inside the curved portion 14 of the main frame 9, and reaches the prime mover 15. The driving force of the prime mover 15 is transmitted to the hub of the gear case 4 via the transmission shaft, and the wheels 6 rotate. The connecting bracket 3 and the transmission shaft housing pipe 13 are connected by a reinforcing frame 29.

In addition, a neutral return mechanism 24 is interposed between the transmission shaft housing pipe 13 and the grooved portion shaft 8.

Figure 2 is a plan view showing the neutral return mechanism. As shown in Figures 1 and 2, the neutral return mechanism 24 connects the transmission shaft housing pipe 13 and the grooved section shaft 8 via coil springs 25a and 25b as elastic bodies that pull them toward a neutral position around the rotation axis. A front adjustment plate 26 extending in the left-right direction is connected to the transmission shaft housing pipe 13, and a rear adjustment plate 27 extending in the left-right direction is fixed to the grooved section shaft 8 via a rotating bracket 31. The front adjustment plate 26 and the rear adjustment plate 27 are provided with a plurality of locking portions (locking holes) 28 for locking the ends of the coil springs 25a and 25b at intervals along the left-right direction (see Figure 2).

As shown in FIG. 2, the coil springs 25a, 25b are provided on both the left and right sides of the straight line connecting the rotational axes of the handle shaft 2 and the grooved portion shaft 8 in a plan view, and here, the right coil spring 25a is disposed below the front and rear adjustment plates 26, 27, and the left coil spring 25b is disposed above the front and rear adjustment plates 26, 27. In this way, since the coil springs 25a, 25b are provided on both the left and right sides of the straight line connecting the rotational axes of the handle shaft 2 and the grooved portion shaft 8 in a plan view, the coil springs 25a, 25b can easily return the handle 1 to the neutral position regardless of whether the handle 1 is turned to the left or right.

In addition, the engagement position of the left coil spring 25b with respect to the front adjustment plate 26 is offset to the left so that the groove cutting section 7 shown in FIG. 1, which is connected to the transmission shaft housing pipe 13, which is oblique in plan view, via the neutral return mechanism 24, is positioned in a neutral position facing forward in the traveling direction of the riding groove cutting machine 100 (to be aligned with the neutral position of the wheels 6; see FIG. 7), and exerts a stronger pulling force than the right coil spring 25a.

Figure 3 is a plan view showing the groove cutting portion, Figure 4 is a left side view showing the groove cutting portion, Figure 5 is a cross-sectional view of the groove cutting portion, and Figure 6 is a plan view showing the closing lid of the groove cutting portion.

As shown in FIG. 3, the groove cutting portion 7 is generally trapezoidal except for the rear end portion in plan view, and is configured, for example, by bending a flat plate so as to form a substantially V-shaped groove in front-rear view as shown in FIG. 5.

Specifically, as shown in Fig. 3 and Fig. 5, the structure is symmetrical except for the blocking lid 7x described later, and as shown in Fig. 3 to Fig. 5, it is provided with left and right side plate parts 7a, 7b for forming the left and right side surfaces of the approximately V-shaped groove, and left and right bottom plate parts 7c, 7d provided at the bottom of the rear end for forming the bottom surface of the approximately V-shaped groove. The left and right side plate parts 7a, 7b become shorter in height toward the front and the left and right width of the V shape becomes smaller, and the lower ends of the left and right side plate parts 7a, 7b are butted, bent, overlapped and joined to form a joint part 7y, except for the bottom plate parts 7c, 7d at the rear end. The left and right bottom plate parts 7c, 7d protrude inwardly to the left and right from the lower ends of the left and right side plate parts 7a, 7b, respectively, behind the joint part 7y, and a space S expanding toward the rear is formed between the left and right bottom plate parts 7c, 7d.

The upper ends 7e, 7f of the left and right side plate portions 7a, 7b are bent outward in the left-right direction to form tapered V-shaped projections in plan view. The front ends of the upper ends 7e, 7f of the left and right side plate portions 7a, 7b are connected by a plate-shaped connecting plate 7g whose left and right ends are fixed, for example, by welding. A through hole 7h (see Figure 3) is opened in approximately the center of this connecting plate 7g, and the groove cutting portion shaft 8 is inserted into this through hole 7h and fixed, for example, by welding (see Figure 1).

The left and right side plate portions 7a, 7b of the groove cut portion 7 are open upward, backward, and forward, and the upper opening 7w (see FIG. 5) is covered by a blocking lid 7x, which is formed, for example, by bending a flat plate, so that it can be opened and closed. As shown in FIG. 6, the blocking lid 7x itself has a symmetrical structure, and the part other than the rear end portion 7o has a tapered trapezoidal shape in a plan view so as to cover the upper opening 7w, and a tapered mountain shape in a front-to-rear view (see FIG. 5). The rear end portion 7o of the blocking lid 7x is inclined downward (see FIG. 4) so as to cover the upper opening 7w.

3 and 5, the right end 7v of the blocking lid 7x, excluding the rear end 7o, is placed on the upper end 7f of the right side plate portion 7b and is supported rotatably via a pair of front and rear hinges 7m. Specifically, the right end 7v of the blocking lid 7x is fixed to the blocking lid side blade 7n of the hinge 7m by, for example, welding (for example, it can be screwed), and the side plate side blade 7p of the hinge 7m is fixed to the upper end 7f of the right side plate portion 7b via a spacer 7q by, for example, screwing (for example, it can be welded).

The wings 7n and 7p of the hinge 7m can rotate around a pin 7t that passes through both wings. A biasing member 7u that biases the closure lid 7x to close is arranged on the hinge 7m, which is the part that rotatably supports the closure lid 7x, so that it wraps around the pin 7t. Here, a torsion spring is used as the biasing member 7u.

The left end 7k of the blocking lid 7x, excluding the rear end 7o, can be moved toward and away from the upper end 7e of the left side plate portion 7a, and when the blocking lid 7x is closed, it is placed on the upper end 7e of the left side plate portion 7a.

As shown in Figs. 3 to 6, a handle 7z is attached to the upper left surface of the blocking lid 7x to be grasped by the operator. Specifically, as shown in Fig. 5, the end of the handle 7z penetrates the left part of the blocking lid 7x, and the handle 7z is attached to the blocking lid 7x by screwing (screwing) a nut 7r onto a male screw formed at the part that penetrates the left part of the blocking lid 7x. One end of a connecting member 7s is fastened together with the nut 7r that fixes the handle 7z. The connecting member 7s is preferably a band-shaped (long and thin) member, and here an electric wire is used.

The other end of the connection member 7s is screwed to the inside of the left side plate portion 7a, and the connection member 7s is bent and accommodated in the grooved portion 7. When the blocking lid 7x rotates open around the pin 7t (see FIG. 10), the connection member 7s is stretched, restricting the opening angle of the blocking lid 7x and preventing it from opening any further.

Here, the closure lid 7x can be opened and closed using the hinge 7m, but any connection with a pivot point such as a pin connection can be used.

In addition, the biasing member 7u is not limited to a torsion spring, but may be any biasing member that is provided in a portion that rotatably supports the blocking lid 7x and biases the blocking lid 7x to close.

Furthermore, the handle 7z and the connecting member 7s are not limited to being fastened by screws, but may be fastened by welding, for example.

Incidentally, here, the left and right portions of the grooved portion 7, excluding the blocking lid 7x, are formed by bending a single flat plate made of, for example, metal, but the upper ends 7f, 7e, etc. of the left and right side plate portions 7a, 7b may be formed as separate plates and connected by welding, etc.

Figure 7 is a plan view showing the phase relationship between the wheel and the groove cutting portion, showing the state in which the wheel and the groove cutting portion are in the neutral position; Figure 8 is a plan view showing the phase relationship between the wheel and the groove cutting portion, showing the state in which the wheel has been rotated clockwise from the neutral position; Figure 9 is a plan view showing the phase relationship between the wheel and the groove cutting portion, showing the state in which the wheel has been rotated counterclockwise from the neutral position.

When using the riding groove cutting machine 100 having the above-mentioned configuration, as shown in FIG. 1, the operator sits astride the seat 12 and drives the prime mover 15. The driving force of the prime mover 15 is transmitted to the gears in the gear case 4 and the inner hub via the transmission shaft housed in the transmission shaft housing pipe 13, and the wheels 6 rotate as driving wheels.

At this time, the handle shaft 2 and the furrow cutting shaft 8 are located in a neutral position around the axis of rotation, and as shown in FIG. 7, the direction of the wheels 6 and the direction of the furrow cutting part 7 are the same, so the riding furrow cutting machine 100 moves forward straight. At this time, the weight of the riding furrow cutting machine 100 and the operator is applied to the wheels 6 and the furrow cutting part 7, so that the furrow cutting part 7 following the wheels 6 digs into the soil surface of the paddy field, pushing the soil upward and outward from the left and right side plate parts 7a, 7b, and the pushed-up soil is spread in the left and right directions by the upper ends 7e, 7f of the left and right side plate parts 7a, 7b, forming an approximately V-shaped furrow.

When the handlebar 1 is rotated while the riding groove cutting machine 100 is moving forward, the handlebar shaft 2, connecting bracket 3, wheels 6, gear case 4, transmission shaft housing pipe 13, and prime mover 15 rotate around the rotational axis of the handlebar shaft 2. For example, when the handlebar 1 is turned to the right, the wheels 6 turn to the right as shown in FIG. 8, and the direction of travel of the riding groove cutting machine 100 changes to the right. Also, when the handlebar 1 is turned to the left, the wheels 6 turn to the left as shown in FIG. 9, and the direction of travel of the riding groove cutting machine 100 changes to the left.

At this time, the groove cutting shaft 8 is connected to the transmission shaft housing pipe 13 via a neutral return mechanism 24 having coil springs 25a, 25b, so that the groove cutting section 7 rotates counterclockwise around the rotation axis of the groove cutting shaft 8 as shown in FIG. 8 when the handlebars 1 are turned to the right, and rotates clockwise as shown in FIG. 9 when the handlebars 1 are turned to the left. In other words, the phase in which the handlebar shaft 2 rotates and the phase in which the groove cutting section 7 rotates are in opposite phases, and the riding groove cutting machine 100 moves forward with the wheels 6 and the groove cutting section 7 facing in opposite directions. In this way, the phase in which the handlebar shaft 2 rotates and the phase in which the groove cutting section 7 rotates can be made in opposite phases, and the wheels 6 and the groove cutting section 7 face in opposite directions, so that the turning radius and inner wheel difference can be reduced, and maneuverability can be improved.

In this state, the neutral return mechanism 24 operates to prevent the steering wheel 1 from remaining in the same operating direction, and the coil springs 25a and 25b rotate the steering wheel 1 and the grooved portion 7 in the opposite direction to the above, returning them to the neutral position. In this way, the steering wheel 1 can be easily returned to the neutral position, allowing stable straight-line travel to be maintained.

As the groove cutting portion 7 forms a roughly V-shaped groove in this manner, mud accumulates on the blocking lid 7x and must be removed.

Figure 10 is a cross-sectional view showing the state in which the blocking lid of the groove cutting section is open. The operator grasps the handle 7z and rotates the blocking lid 7x around the pin 7t, which serves as the pivot point, to easily open it.

At this time, the connecting member 7s that connects the inner part of the left side plate portion 7a of the groove cutting portion 7 and the inner surface of the blocking lid 7x and is bent and housed in the groove cutting portion 7 is stretched taut, and the blocking lid 7x opens until it becomes an obtuse angle. By opening the blocking lid 7x, the mud accumulated on the blocking lid 7x falls and can be easily removed. That is, by rotating the blocking lid 7x around the pin 7t that serves as the pivot point of the upper end portion 7f of the right side plate portion 7b, the mud accumulated on the blocking lid 7x can be easily removed. In addition, there is no need for a complicated operation such as releasing the bolt connection of all the covers that block the upper opening as in the conventional technology, and the blocking lid 7x can be opened by a simple operation of rotating the blocking lid 7x around the pin 7t that serves as the pivot point, and as a result, the inside of the groove cutting portion 7 can be easily cleaned.

In addition, by tensioning the connecting member 7s, the opening angle of the blocking lid 7x is restricted, and the blocking lid 7x can be opened to an angle at which mud on the blocking lid 7x can be removed. Therefore, by opening the blocking lid 7x until the connecting member 7s is tensioned, mud accumulated on the blocking lid 7x can be easily removed. In addition, the connecting member 7s can prevent the blocking lid 7x from being opened too far, eliminating the risk of damage to crops caused by the blocking lid 7x.

Then, once the mud that has accumulated on the blocking lid 7x has been removed, the worker loosens his grip on the handle 7z and either holds it or releases it.

Then, the blocking lid 7x can be easily closed by the biasing force of the biasing member 7u provided on the hinge 7m, which is the part that rotatably supports the blocking lid 7x.

If the connecting member 7s is made of, for example, a spring or rubber, and has an elastic force that biases the blocking lid 7x to close, the blocking lid 7x can be easily closed by the elastic force of the connecting member 7s even without the biasing member 7u.

In addition, even without the connecting member 7s, if the biasing force of the biasing member 7u is increased and the operator is allowed to open the blocking lid 7x to an angle at which the mud on the blocking lid 7x can be removed, the biasing force of the biasing member 7u can easily close the blocking lid 7x, and the biasing force of the biasing member 7u can prevent the blocking lid 7x from being opened too far, eliminating the risk of damage to crops caused by the blocking lid 7x.

Incidentally, even if the device is equipped with both the connecting member 7s, which has an elastic force that biases the blocking lid 7x to close, and the biasing member 7u, the blocking lid 7x can be easily closed and the blocking lid 7x can be prevented from opening too far, eliminating the risk of damage to crops caused by the blocking lid 7x.

Figure 11 is a cross-sectional view showing a groove cutting portion according to a second embodiment of the present invention, and Figure 12 is a plan view of the groove cutting portion shown in Figure 11.

The second embodiment differs from the first embodiment in that vibration absorbing members 7i, 7j, such as rubber, are interposed between the left end 7k and right end 7v of the blocking lid 7x and the upper ends 7e, 7f of the left and right side plate portions 7a, 7b that face the left end 7k and right end 7v of the blocking lid 7x.

According to this second embodiment, the vibration absorbing members 7i, 7j can absorb vibrations during operation of the riding groove cutting machine 100, preventing noise generation and damage. Here, the vibration absorbing members 7i, 7j are provided on the upper ends 7e, 7f of the left and right side plate portions 7a, 7b, but they may also be provided on the undersides of the left end 7k and right end 7v of the blocking lid 7x.

Although the present invention has been specifically described above based on the embodiments thereof, the present invention is not limited to the above embodiments. For example, a fastener such as a strong clip may be provided to temporarily fix the left end 7k of the blocking cover 7x to the upper end 7e of the left side plate portion 7a, thereby suppressing vibrations during operation of the riding groove cutting machine 100 and preventing noise generation and damage.

The blocking lid 7x may also be extended rearward to block the opening that opens rearward of the groove cutting section 7.

In addition, in the above embodiment, the handle 1 is rotatable, but it may be non-rotatable, and the grooved portion 7 may also be non-rotatable.

The positions of the pivot fulcrum 7t and handle 7z of the blocking lid 7x may also be reversed. In this case, the opening direction of the blocking lid 7x will also be reversed, and the mounting position of the connecting member 7s will also be reversed.

In addition, in the above embodiment, the application to the furrow cutting section 7 of the riding furrow cutting machine 100, which is a riding type paddy field furrow cutting machine, is described, but it can also be applied to the furrow cutting section of a walk-behind paddy field furrow cutting machine.

7...groove cutting section, 7a...left side plate section, 7b...right side plate section, 7e...upper end of left side plate section, 7f...upper end of right side plate section, 7i, 7j...vibration absorbing members, 7k...left end of closing lid, 7m...hinge (rotatably supported part), 7s...connecting member, 7t...pin (rotation fulcrum), 7u...biasing member, 7v...right end of closing lid, 7w...opening, 7x...closing lid, 7z...handle, 100...riding ditch cutting machine (paddy field ditch cutting machine).

Claims (7)

A paddy field furrow cutting machine (100) for forming a substantially V-shaped furrow in a paddy field is provided with left and right side plate portions (7a, 7b) for forming left and right side surfaces of the furrow, and an opening (7w) is formed above the left and right side plate portions (7a, 7b).
A closing lid (7x) that closes the opening (7w) in an openable and closable manner is provided,
The groove cutting section (7) of the paddy field furrow cutting machine (100) is characterized in that either one of the left end portion (7k) or the right end portion (7v) of the blocking lid (7x) is rotatably supported on a pivot point (7t) of the upper end portion (7f) of one of the left and right side plate portions (7a, 7b), and the other end portion (7k) of the left end portion (7k) or the right end portion (7v) of the blocking lid (7x) is capable of being brought into contact with and separated from the upper end portion (7e) of the other of the left and right side plate portions (7a, 7b). a connecting member (7s) that connects an inner portion of the other (7a) of the left and right side plate portions (7a, 7b) of the grooved portion (7) to an inner surface of the blocking lid (7x) and is bent and accommodated in the grooved portion (7);
The connecting member (7s) is stretched to regulate the opening angle of the blocking lid (7x),
The furrow cutting section (7) of a paddy field furrow cutting machine (100) according to claim 1, characterized in that the blocking lid (7x) can be opened to an angle at which mud on the blocking lid (7x) can be dropped. The groove cutting section (7) of the paddy field groove cutting machine (100) according to claim 2, wherein the connecting member (7s) has an elastic force that biases the blocking lid (7x) to close. The furrow cutting section (7) of the paddy field furrow cutting machine (100) according to any one of claims 1 to 3, characterized in that a biasing member (7u) that biases the blocking lid (7x) so as to close is provided on a portion (7m) that rotatably supports the blocking lid (7x). The furrow cutting section (7) of the paddy field furrow cutting machine (100) according to any one of claims 1 to 4, characterized in that vibration absorbing members (7i, 7j) are interposed between the left end (7k) and the right end (7v) of the blocking lid (7x) and the upper end (7e, 7f) of the left and right side plate portions (7a, 7b) that face the left end (7k) and the right end (7v) of the blocking lid (7x). The furrow cutting section (7) of the paddy field furrow cutting machine (100) according to any one of claims 1 to 5, characterized in that it has a fastener for temporarily fixing the other end (7k) of the left end (7k) or the right end (7v) of the blocking cover (7x) to the upper end (7e) of the other (7a) of the left and right side plate portions (7a, 7b). The blocking lid (7x) is rotatably supported via a hinge (7m),
The furrow cutting portion (7) of a paddy field furrow cutting machine (100) according to any one of claims 1 to 6, characterized in that a handle (7z) is provided on an upper surface of the blocking lid (7x).

Images