JP5078299B2 - Rotary tillage device - Google Patents

Description

  The present invention relates to a rotary tillage device mounted on a traveling machine such as a tractor, and more particularly to a support structure for a rear cover that covers the rear of a rotary.

  Conventionally, rotary tillage devices are equipped with a rotary tillage part with a number of tillage claws attached on a pawl shaft that rotates by receiving a driving force, and a rotary tillage cover that covers the rotary tillage part. Has been. The rotary tiller cover includes a main cover that is fixed to the rotary machine frame and covers the upper side of the rotary tiller part, and a rear cover that is swingably connected to the rear end side of the main cover in the vertical direction and covers the rear side of the rotary tiller part. It has, for example, prevention of scattering of cultivated soil cultivated in the rotary cultivating section.

  The rear cover is used for various purposes other than preventing scattering of tillage soil. For example, when fixing the rear cover in the lowest state, such as when scraping, pressing the farm scene simultaneously with plowing and finishing the tilled soil flatly, or connecting a vertical stand behind the rotary tiller, The rear cover is fixed to the middle stage when setting up by cultivating soil. Also, during cleaning and maintenance such as removing mud adhering to the rotary tillage part, the rear cover is fixed to the upper stage so as not to interfere with cleaning and maintenance. Further, when the rotary tiller main body is removed from the tractor hitch and accommodated in a hangar or the like, the rear cover may be used as a rotation stop of the main body.

  The rear cover used for these purposes is connected and supported to the main cover by a connecting mechanism that can be fixed at an arbitrary swinging position. The coupling mechanism inserts and supports a suspension rod to be coupled to the rear cover in a mounting bracket provided on the main cover, and engages an engagement pin formed in the suspension rod by advancing and retracting an engagement pin from the mounting bracket. The position can be fixed. This connection mechanism is connected via an operation tool attached to the top mast of the rotary tiller and a wire, and an operator on the tractor can perform an operation according to each tillage work (Patent Document 1). .

  In addition, the coupling mechanism is improved so that it can be maintained in a locked state in which the movement of the rear cover is completely stopped, a free state in which the movement of the rear cover is completely free, and an auto hanger state in which movement in one direction is allowed. is there. Such a coupling mechanism is capable of fixing the rear cover at each position by engaging a suspension rod formed with a large number of engagement recesses with an engagement pin having an inclined surface at the tip, and the movement of the rear cover in one direction. It is the structure which can prevent the movement of other directions, for example (for example, patent document 2 and patent document 3).

JP-A-9-168304 Japanese Patent No. 3431979 JP 2004-16087 A

  However, in the rotary tiller described in Patent Document 1, for example, when the rear cover at the lower position is fixed at the raised position, the operator lifts the rear cover by an operator, After alignment with the engagement pin, it is necessary to operate the operation tool attached to the top mast with one hand while maintaining the position of the rear cover to engage the engagement pin with the engagement hole. For this reason, each operation has to be performed simultaneously with one hand, making it difficult to raise and fix the rear cover. When leveling the tillage soil, the rear cover fixed at the upper position is switched to the free state or the lower position. The engagement pin inserted into the engagement hole has a weight of the rear cover. Therefore, a large force that resists the weight of the rear cover is required for the operation of pulling out the engaging pin, and the engaging pin pulling-out operation tool has to have a strong structure.

  Further, in the rotary tillers described in Patent Documents 2 and 3, the rear cover is allowed to move upward from the lower position by the action of the engaging pin having an inclined surface at the tip. In the lock device described in Patent Document 2, a lock position for fixing the movement of the rear cover, a free position where the movement of the rear cover is completely free, and an auto hanger state that allows the movement of the rear cover in one direction are provided. Although it is possible to set the mode, it does not have a mode for switching from the lock position and the auto hanger state to the free position, and operates the lock device against the weight of the rear cover in the same manner as the above-described extraction operation tool. It was necessary to make the locking device a strong structure. Further, in the rear rear cover support device described in Patent Document 3, there are a free state in which the rear cover swings freely, a locked state in which the swing of the rear cover is fixed, and a semi-lock state in which only the rear cover is moved upward. Although it is possible to set to three modes, it does not have a mode for switching from the locked state and the semi-locked state to the free state, and has the same problem as described above.

  Accordingly, the present invention provides a rear cover adjusting means for adjusting the fixed position of the suspension rod connected to the rear cover, and enables the rear cover to be switched to the automatic lock position, the fixed position, and the friction holding position, thereby solving the above-described problems. An object of the present invention is to provide a rotary plowing device.

In order to achieve the object, the present invention according to claim 1 includes a main cover (18) covering an upper part of the rotary tillage part (13a),
A rear cover (20) connected to the main cover in a swingable manner and covering the rear of the rotary tillage portion (13a);
A rotary tiller (1) comprising a suspension rod (27) coupled to one of the main cover (18) and the rear cover (20) and slidably supported on the other.
The suspending rod (27) is slidably supported at a portion (25), the tip is formed of an inclined surface (32a), and the inclined surface is engaged with an engagement hole (27a) formed in the suspending rod. A removable lock pin (32),
A spring (35) for urging the lock pin (32) in a direction away from the engagement hole (27a);
The lock pin (32) has an automatic lock position (for example, see FIG. 4) that allows the rear cover (20) to move upward and prevents a downward movement, and a fixed position (for example, prevents the rear cover from moving up and down ). , and see FIG. 5), the weight of the rear cover (20) is in the state that acts between the lock pin and the engaging hole, the lock pin by friction between the lock pin and the engaging hole of the spring (35) When the rear cover is prevented from moving downward by the urging force to prevent the rear cover from moving downward, and the action of the weight is released, the lock pin is disengaged from the engagement hole by the urging force of the spring. friction holding position where the vertical movement are both free of the rear cover (for example, see FIGS. 3 and 6) with a, and the rear cover adjusting means (30) capable of switching on, the,
The rotary tiller is characterized by the above.

According to a second aspect of the present invention, the operating means (40) is provided on the top mast (9) of the rotary tillage portion (13a), and the operating means is linked to the rear cover adjusting means (30), so that the operating means The rear cover adjusting means (30) is operated by the operation of (40).
The rotary tiller according to claim 1.

  Note that the reference numerals in the parentheses are in contrast to the drawings and do not affect the description of the claims.

  According to the first aspect of the present invention, since the suspension rod connected to the rear cover is supported by the main cover via the rear cover adjusting means, the rear cover adjusting means allows the rear cover to move upward and moves downward. An automatic lock position for blocking, a fixed position for blocking sliding in the vertical direction, and a friction holding position for holding in a state where the weight of the rear cover is applied and in a free state for moving up and down freely when the weight is released. And can be switched to. Therefore, since the rear cover in the fixed position or the automatic lock position is in the free state after passing through the friction holding position, the mechanism for operating the rear cover adjusting means can be simplified, and the rear cover does not fall inadvertently. , Work safety can be ensured.

  According to the second aspect of the present invention, since the rear cover adjusting means is operated by the operating means provided on the top mast of the rotary tiller body, for example, an operator who operates and steers the tractor is operated while being in the cab. The position of the rear cover can be switched by operating the means.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the rotary tiller 1 is connected to the rear of a tractor (running machine body) 2 via a three-point link device 3 so as to be movable up and down. The three-point link device 3 includes two lower links 3a and one top link 3b. The two lower links 3a are connected to the rear left and right of the tractor body 2 by pins. The lift arm 6 is connected via a lift rod 5. The top link 3 b is connected to a bracket 7 provided at the center of the rear portion of the tractor 2, and the rotary side of the lower link and the top link is connected to a hitch 8. One of the left and right lift rods 5 is provided with a hydraulic cylinder (not shown), and the rotary tiller 1 is controlled to swing in the left and right directions with respect to the tractor 2 by expansion and contraction of the hydraulic cylinder. Yes.

  The rotary tiller 1 includes a tiller unit body 10 including a top mast 9 and a transmission case 12, and the tiller unit body is attached to the hitch 8. Output from the PTO shaft of the tractor 2 is input to the transmission device 12 of the tiller unit main body 10 via the yoke, and the power is transmitted to the tiller shaft 13 via the chain in the chain case 11. . A number of tilling claws 13a are attached to the tilling shaft 13, and rotary tilling is performed by the rotation of the tilling claws 13a. Further, a tool bar 16 is disposed via an arm 15 extending rearward from the tiller unit body 10, and the tool bar 16 can be adjusted in height by a handle 17.

  A rotary main cover 18 is disposed on the tiller body 10 so as to cover the upper portion of the tillage claw 13a so as to be adjustable in the front-rear direction. ) Is supported so as to be swingable about a shaft 21 extending to the center. A side cover 22 is attached to the rotary main cover 18 so as to cover both sides of the tilling claw 13a. A main cover bracket 25 and a rear cover bracket 26 are fixed at two positions on the outside of the rotary main cover 18 and the rear cover 20, respectively, and are pivotally supported by the rear cover bracket 26 and slidable on the main cover bracket 25. The suspension rod 27 is disposed on the rear cover 20 so that the rear cover 20 can be fixed at the lower position, that is, at the position where the rear cover 20 is pressed toward the farm scene or at the upper position.

  The main cover bracket 25 is provided with a rear cover adjusting means 30 for fixing the sliding position of the suspension rod 27, and the swing position of the rear cover 20 can be fixed. The rear cover adjusting means 30 is connected to an operating lever (operating means) 40 attached to the top mast 9 via a wire 36, and the swinging position of the rear cover 20 can be changed by operating the operating lever. .

  Next, the rear cover adjusting means 30 will be described. The rear cover adjusting means 30 is rotatably inserted into the main cover bracket 25 in a mounting hole 25a drilled in the lateral direction of the rotary tiller 2. As shown in FIGS. 3 (A), 4 (A), 5 (A), and 6 (A), the rear cover adjusting means 30 includes a lock case 31 that supports the suspension rod 27, and the lock case. The lock pin 32 is slidably inserted in the axial direction of the case, and the operation pin 33 is used to operate the slide position of the lock pin 32.

  The lock case 31 is a substantially cylindrical member, and one end 31a is arranged in alignment with one of the attachment holes 25a. The lock case 31 between the main cover brackets 25 and 25 is provided with a suspension rod insertion hole 31b that penetrates in the radial direction and through which the suspension rod 27 is slidably inserted. Further, a through hole having an inner diameter difference is formed in the axial direction of the lock case 31, and the lock pin sliding hole 31d formed with a small diameter intersects with the suspension rod insertion hole 31b. An operation pin sliding hole 31e having an inner diameter larger than that of the pin sliding hole 31d is disposed toward the other end 31c side of the lock case 31.

  In the lock pin sliding hole 31d, a lock pin 32 having a tip 32a aligned with the vicinity of the suspension rod insertion hole 31b is disposed. The tip 32a of the lock pin 32 is formed on an inclined surface, and the inclined surface can protrude from the suspension rod insertion hole 31b when the lock pin sliding hole 31d is moved in the axial direction. Further, the rear end 32b of the lock pin 32 is located in the operation pin sliding hole 31e, and an engagement protrusion having an outer diameter substantially the same as the inner diameter of the operation pin sliding hole 31e is formed. One end of the lock pin spring 35 to be fitted abuts. The other end of the lock pin spring 35 is brought into contact with a step portion between the operation pin sliding hole 31e and the lock pin sliding hole 31d, and urges the lock pin 32 in a direction away from the suspension rod insertion hole 31b. ing. On the peripheral surface of the lock pin 32, at least one surface 32c that prevents the lock pin 32 from rotating relative to the lock case 31 is formed. In this case, it is necessary to form a surface slidably contacting the surface 32c on the lock pin sliding hole 31d side facing the surface 32c. For example, the cross-sectional shapes of the lock pin 32 and the lock pin sliding hole 31d Since the lock pin 32 does not rotate with respect to the lock case 31, the surface 32c can be omitted. The lock pin 32 stopped in this manner slides in the lock pin sliding hole 31d while the inclined surface formed at the tip 32a is held in a certain direction, and the tip 32a is moved from the suspension rod insertion hole 31b. Can gradually protrude. The tip 32 a can be inserted into one of a plurality of engagement holes 27 a formed on the peripheral surface of the suspension rod 27 to fix the position of the suspension rod 27.

  On the rear end 32b side of the lock pin 32 inserted into the operation pin sliding hole 31e of the lock case 31, an operation pin 33 is slidably disposed. The operation pin 33 is a member formed in a substantially cylindrical shape, and an engagement protrusion 33c projects in the radial direction in the vicinity of the front end side, and is connected to the operation lever 42 on the rear end side 33b. An operation wire 36 is connected. The operation pin 33 is loosely fitted with an operation pin spring 37 with one end abutting against the engagement protrusion 33c and the other end abutting with an end cap 38 provided on the end 31c of the lock case 31. The operation pin spring 37 biases the lock pin 32 in the direction of the suspension rod insertion hole 31b. Note that the urging force of the operation pin spring 37 is set to be stronger than the urging force of the lock pin spring 35. When the force from the operation wire 36 does not act on the operation pin 33, the operation pin spring 37 is The lock pin spring 35 can be compressed, and the lock pin 32 can be moved in the engaging direction via the operation pin 33.

  Next, operation means for operating the above-described rear cover adjustment means 30 will be described. As shown in FIG. 3 (B), FIG. 4 (B), FIG. 5 (B), and FIG. 6 (B), the operation means 40 is operated on an operation case 41 fixed on one side of the top mast 9. The lever 42 is pivotally supported. The operation case 41 is a box-shaped member formed in a substantially rectangular shape. A wire guide 36a of the operation wire 36 connected to the rear cover adjusting means 30 is bolted to one side surface so as to be adjustable in length. A shaft 41a that pivotally supports the operation lever 42 is provided in the vicinity of the opposing side surfaces (see FIG. 3B). The operation lever 42 pivotally supported by the shaft 41a has a short side 42a and a long side 42b with the shaft 41a as the center. The operation wire 36 is connected to the short side 42a and the long side 42a is long. The side 42b is formed with a handle portion that is gripped by an operator. In this case, the short side 42 a and the wire 36 are connected by a structure that can absorb the bending of the wire 36. In addition, a long hole 42c is bored in the longitudinal direction of the operation lever 42 at a substantially central portion of the long side 42b, and three engaging pins 9a, 9b, 9c projecting from one side surface of the top mast 9 are provided. It can be selectively engaged. The engaging pins 9a, 9b, 9c are arranged on the same circumference centering on the shaft 41a, and the operating lever 42 is tilted clockwise to engage the elongated hole 42c with the engaging pin 9a. Then, the operation wire 36 can be most drawn out and fixed in a free state (friction holding position) (see FIGS. 3A and 3B).

  At the friction holding position, the rear cover adjusting means 30 is operated to hold the operation pin 33 at a position farthest from the suspension rod insertion hole 31b. Similarly, when the elongated hole 42c is engaged with the engagement pin 9b, the operation wire 36 is fixed at the intermediate position, and the operation pin 33 can be held at the automatic lock position that is brought closer to the suspension rod insertion hole 31b (see FIG. 4). (See (A) and (B)). Further, when the elongated hole 42c is engaged with the engagement pin 9c, the operation wire 36 is fixed at the pushed-out position, and the operation pin 33 can be held at the fixed position closest to the suspension rod insertion hole 31b (FIG. 5 ( A) See (B)). In this case, the disengagement between the engagement pins 9a, 9b and 9c and the long hole 42c of the operation lever 42 is performed by separating the operation lever 42 from one side surface of the top mast 9 against the rigidity of the operation lever 42. It is done by operating in the direction to do.

  Next, the operation of the rotary tiller configured as described above will be described. In the rotary tiller 1 connected to the tractor 2, the tilling claw 13 a that receives the power from the tractor 2 is driven to rotate to plow the field scene. In normal tillage work, the rear cover 20 receives the tilled soil scattered by the rotation of the tilling claws 13a to prevent scattering to the surroundings, and presses the tilled soil raised by the tillage to The finish is flat. At the time of plowing that does not require leveling of the farm scene, such as uprighting work, the rear cover 20 is fixed at a position away from the farm scene, and the tilling work proceeds without leveling the farm scene. Furthermore, the rear cover 20 is fixed in a state where the rear cover 20 is lifted for cleaning or maintenance work of the tillage portion. When the rotary tiller 1 is separated from the tractor 2 and stored in a hangar or the like, the rear side of the rotary tiller 1 is supported by the rear cover 20 fixed at the upper position in order to prevent the separated rotary tiller body from overturning. .

  As described above, in order to switch the position of the rear cover 20 according to each work state, the operation lever 42 provided on the operation means 40 is tilted. In order to switch the rear cover 20 to the lower position by normal tillage work or the like, the operation lever 42 is set to the free state (friction holding position) of the engagement pin 9a (FIGS. 3A and 3B). In the friction holding position, the operation wire 36 is pulled by the operation lever 42, and the operation pin 33 of the rear cover adjusting means 30 connected to the operation wire 36 moves in a direction in which the operation pin spring 37 is compressed. Due to the movement of the operation pin 33, the lock pin 32 that comes into contact with the operation pin 33 moves in the same direction as the operation pin 33, that is, in a direction away from the suspension rod insertion hole 31 b due to the urging force of the lock pin spring 35.

  In the free state, since the tip 32a of the lock pin 32 is located away from the suspension rod insertion hole 31b, the suspension rod 27 can freely move in the direction penetrating the suspension rod insertion hole 31b, and the rear cover 20 is positioned below by its own weight. Move to. Further, during the tilling work, when the rear cover 20 comes into contact with the farm scene and a force in the direction of lifting the rear cover 20 is applied, the suspension rod 27 slides freely within the suspension rod insertion hole 31b. Can move to position.

  Next, when it is not necessary to level the cultivated soil with the rear cover 20, the rear cover 20 is cultivated with the rear cover 20 floating from the field scene. In order to switch to this state, the operation lever 42 in the friction holding position described above is set to the automatic lock position of the engagement pin 9b (FIGS. 4A and 4B). At the automatic lock position, the operation wire 36 is pushed out by one step by the operation lever 42, and the operation pin 33 is moved to the suspension rod insertion hole 31 b side by the urging force of the operation pin spring 37. By operating the operation pin 33, the lock pin spring 35 is compressed and the lock pin 32 is pushed out, and the inclined surface of the tip 32a is held at a position protruding from the suspension rod insertion hole 31b.

  Since the lock pin 32 in the automatic lock position can push back the operation pin 33 against the urging force of the operation pin spring 37, the suspension rod 27 is engaged with the inclined surface formed at the tip 32 a of the lock pin 32. When the hole 27a abuts, the lock pin 32 is moved away from the suspension rod insertion hole 31b by the force divided in the sliding direction of the lock pin 32 acting on the inclined surface.

  On the other hand, when the engagement hole 27a comes into contact with the non-inclined portion of the tip 32a, only a force in the shearing direction is applied to the lock pin 32, and no component force for sliding the lock pin 32 is generated. The lock pin 32 does not move from the suspension rod insertion hole 31b. That is, when an upward force is applied to the rear cover 20 such as when the rear cover 20 is lifted, the engagement hole 27a of the suspension rod 27 acts on the inclined surface of the tip 32a of the lock pin 32, and the lock pin 32 is inserted into the suspension rod. The rear cover 20 can be moved upward by moving in a direction away from the hole 31b. Conversely, when the engagement hole 27a acts on the non-inclined surface of the tip 32a of the lock pin 32 due to its own weight or the like, the lock pin 32 does not move and the position of the rear cover 20 is fixed. . As described above, in the automatic lock position, it is possible to form a state in which the rear cover 20 is allowed to move upward but is prevented from moving downward.

  Next, in order to fix the rear cover 20 in a state of floating from the farm scene and prevent the rear cover 20 from swinging up and down, the operation lever 42 is set to the fixed position of the engagement pin 9c (FIGS. 5A and 5B). )). In the fixed position, the operation wire 36 is completely pushed out by the operation lever 42, and the operation pin 33 of the rear cover adjusting means 30 connected to the operation wire 36 moves in a direction in which the operation pin spring 37 is extended. When the operation pin 33 is actuated, the lock pin 32 that comes into contact with the operation pin 33 compresses the lock pin spring 35 to completely protrude from the suspension rod insertion hole 31b and is inserted into the engagement hole 27a. To fix. At the fixed position, since the peripheral surface of the lock pin 32 is inserted into the engagement hole 27a, the suspension rod 27 does not swing up and down even when a vertical force is applied to the rear cover 20, and the rear cover 20 Can be fixed.

  The friction holding position is also used when the rear cover 20 at the automatic lock position or the fixed position described above is shifted to the free state (FIGS. 6A and 6B). In order to switch to the friction holding position, the operation lever 42 in the automatic lock position or the fixed position is set to the engagement pin 9a. In the friction holding position, the operation wire 36 is pulled out and the operation pin 33 operates in the same manner as in the free state, but the lock pin 32 does not move because the force from the suspension rod 27 acts in the shear direction. The operation pin 33 and the lock pin 32 are located away from the operation pin 33. Since the urging force of the lock pin spring 35 acts on the lock pin 32 in this state, when the shearing force from the suspension rod 27 disappears, the lock pin 32 moves in a direction in contact with the operation pin 33 and is free. Transition to the state.

  That is, if the engagement force between the engagement hole 27a of the suspension rod 27 and the lock pin 32 is weakened by lifting the rear cover 20 at the automatic lock position or the fixed position, the urging force of the lock pin spring 35 is won and the lock The pin 32 comes out of the suspension rod insertion hole 31b and enters a free state. In the friction holding position, since the operation lever 42 indirectly extracts the lock pin 32 via the operation pin 33, the operation lever 42 can be easily operated even when an engagement force is applied to the lock pin 32. Can be operated. Further, since a large force does not act on the operation pin 33, the operation lever 42 can be simplified in structure, particularly the operation wire 36 can be simplified. Further, in order to switch from the automatic lock position or the fixed position to the free state, the rear cover 20 does not move immediately even if the operation lever 42 is operated, and it is free by lifting the external cover, particularly the rear cover 20 by an operator. Since the position is switched, an excessive force is not applied to the rear cover 20 and the holding structure of the rear cover 20 such as the rear cover 20 being inadvertently operated.

  Finally, the embodiment according to the present invention described above describes the best mode of the rotary tiller as one embodiment, but the rear cover adjusting means 30 attached to the main cover bracket 25 is replaced with the rear cover bracket. 26 can also be attached. Further, as described in, for example, Patent Document 2 and Patent Document 3, the operation means 40 can be provided directly on the rear cover adjustment means 30. Furthermore, it adds that the idea of this invention can be diverted to the agricultural working machine widely used in the field.

It is a side view which shows the structure of a rotary tillage apparatus. It is the figure which looked at the rotary cultivator from back. It is a figure which shows the cross section of the rear-cover adjustment means in a free position. It is a figure which shows the cross section of the rear-cover adjustment means in an automatic lock position. It is a figure which shows the cross section of the rear-cover adjustment means in a fixed position. It is a figure which shows the cross section of the rear-cover adjustment means in a friction holding position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotary tilling apparatus 13a Rotary tilling part 18 Main cover 20 Rear cover 25 Main cover bracket 27 Hanging rod 30 Rear cover adjustment means

Claims (2)

A main cover that covers the top of the rotary tillage unit;
A rear cover that is swingably connected to the main cover and covers the rear of the rotary tillage unit;
A rotary tiller that includes a suspension rod that is connected to one of the main cover and the rear cover and is slidably supported on the other.
A lock pin that is disposed at a portion that slidably supports the suspension rod, has a tip formed of an inclined surface, and the inclined surface is detachably engageable with an engagement hole formed in the suspension rod;
A spring that urges the lock pin in a direction away from the engagement hole;
An automatic lock position for allowing the rear cover to move upward and preventing downward movement; a fixed position for preventing both rear cover vertical movements; and a weight of the rear cover from the lock pin and the engagement hole. In the state of acting in between, the friction between the lock pin and the engagement hole prevents the lock pin from being detached from the engagement hole by the biasing force of the spring, and prevents the rear cover from moving downward, and the weight A rear cover adjusting means capable of switching to a friction holding position where the lock pin is released from the engagement hole by the biasing force of the spring and the vertical movement of the rear cover is freed when the action of is released.
A rotary tiller characterized by that. An operating means is provided on the top mast of the rotary tiller, and the operating means is operated in conjunction with the rear cover adjusting means, and the rear cover adjusting means is operated by operating the operating means.
The rotary tiller according to claim 1.

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