JP5193901B2 - Pricking machine - Google Patents

Description

  The present invention relates to a scraping work machine that is attached to the rear part of a tractor and cultivates a farm field and leveles the surface of the cultivated soil, and more particularly relates to a posture control of a leveler when the skimming work machine performs scraping work from the heel.

  Conventionally, it is mounted on a three-point link mechanism at the rear of the tractor, and has a tilling rotor that cultivates the field and a leveling body (apron and leveler) that smoothes the cultivated soil surface (mud surface) behind the tilling rotor Work machines are known.

  For example, the ground leveling body 6 of the skimming work machine described in Patent Document 1 is a first leveling body (vertically movable at the rear end of the tilling rotor cover 51 by a horizontal first leveling body rotating shaft 62 ( An apron) 60 and a second leveling body (leveler) 61 provided at the rear end of the first leveling body (apron) 60 so as to be rotatable up and down by a horizontal second leveling body rotation shaft 63. The mud ground crushed by the rotor 5 is crushed and leveled. The posture control of the ground leveling body 6 is performed by a earthing operation device having a leveling body operating lever 22 provided in the top mast 2 portion and an operating rod connecting the leveling body operating lever 22 and the leveling body 6.

  As shown in FIG. 1 and FIG. 2 of Patent Document 1, the operating rod has two upper and lower stages, and the joint portion between the upper operating rod and the lower operating rod is obliquely upward from the rear of the top mast 2 to the rear. It is rotatably supported by the extended swing arm. A spring (not shown) for controlling the posture of the leveling body 6 is arranged along the upper operation rod. Then, when the operating rod is pulled to the top mast 2 side by the leveling body operating lever 22 and operated, the leveling body 6 is free to rotate in the vertical direction of the ground leveling posture (second leveling body (leveler) 61). The leveling body 6 is in the earthing work posture (the second leveling body (leveler) 61 is standing up and down) when the operating rod is extended to the leveling body 6 side. Is to take.

JP 2008-125381 A (paragraph 0016, FIGS. 1 and 2)

  By the way, when performing the scraping work on the edge using the scraping work machine described in Patent Document 1, the scraping work machine is rotated upward by the hydraulic lift of the three-point link mechanism of the tractor, and the tractor You can approach the shore by retreating. When reaching the dredge, the scraping work machine is rotated downward by the three-point link mechanism, and the leveling body 6 is landed on the upper surface of the kite or the slope of the kite.

However, since the second leveling body (leveler) 61 is in a leveling posture in order to perform the scraping work, the second leveling body (leveler) 61 rotates upward (splashed up) when landing on the upper surface of the kite or the slope of the kite. There is a risk of inversion on the first leveling body (apron) 60 (see FIG. 4B of the present application).
Further, even if the second leveling body 61 does not rotate upward when landing on the upper surface of the kite or the slope of the kite, the second leveling body 61 can rotate upward when descending the slope of the kite by pulling the tractor. There is a risk of moving.

  In a state in which the second leveling body (leveler) 61 is rotated upward and is placed on the first leveling body (apron) 60, the second leveling can be achieved even if the tilling rotor 5 is rotated and the tractor is moved forward. The body (leveler) 61 cannot level the cultivated soil surface. Therefore, if the scraping operation is performed as it is, the scraping operation is performed only with the first leveling body (apron) 60, and the leveling and leveling become insufficient.

  From the above background, the present invention can return the leveler placed on the heel or on the slope of the shore or rotated upward when pulled down by the tractor to the original leveling posture. This is a proposal for a scratching machine.

According to a first aspect of the present invention, there is provided a plowing work machine mounted on a rear portion of a tractor, which receives power from the tractor and rotates around a horizontal axis, and a ground leveling posture and a earthing work posture on a rear side thereof. In the scraping work machine equipped with an apron and a leveler that are arranged to be switchable,
A spring member (biasing member) that applies a biasing force to the leveler to rotate the leveler in a direction to return to the leveling posture by being pressed by the leveler that has rotated upward from the leveling posture over a predetermined angle. ) Is arranged in a hinge part (connecting part) that connects the apron and the leveler.

  Since the leveler in the leveling posture as described above is free to rotate in the vertical direction, it is placed on the upper surface of the kite or the kite slope by the three-point link mechanism of the tractor. When pulled down the slope of the kite, it may turn upward and remain on the apron. Without restricting the upward rotation when the leveler is in the leveling posture, it generates a force to return the leveler to the leveling posture according to the amount of rotation when the leveler rotates upward. By adding to the leveler, it is possible to return the leveler rotated upward to the leveling posture.

Therefore, a spring member that applies a biasing force to the leveler to rotate the leveler in a direction returning to the leveling posture by being pressed by the leveler rotated upward from the leveling posture upward by a predetermined angle is applied to the apron and the leveler. By arranging it in the hinge part to be connected, it becomes possible to return the leveler to the original leveling posture if the mud surface with which the leveler contacts is horizontal.
As a result, even if the scraping work is started from a state in which the scraping work machine is brought close to the saddle and the leveler has run on the saddle, the leveler that has rotated upward is rotated downward to return to the original leveling posture. Since it can be returned, desired scraping work can be performed.

  When the apron and the leveler are connected by a plurality of hinge portions, there are a case where a spring member is disposed on all of the plurality of hinge portions and a case where a spring member is disposed only on a part of the hinge portions. When a spring member is arranged on a part of the hinge part, the spring member is provided at the center part in the longitudinal direction of the apron and the leveler, or the spring members are respectively arranged at positions symmetrical with respect to the central part in the length direction. Is preferred.

  Specifically, the spring member includes a coil portion disposed around a hinge pin (axial mandrel) of the hinge portion, a first arm portion extending from the coil portion to the front side in the traveling direction and contacting the apron, and the coil portion And a second arm portion that extends to the rear side in the advancing direction and contacts the leveler (Claim 2), when the leveler in the leveling position rotates upward over a predetermined angle. The coil portion is twisted by the second arm portion in contact with the leveler and the first arm portion in contact with the apron to generate a torsional moment (torque). That is, it is possible to generate a force (torque) for returning the leveler to the leveling posture by twisting the coil portion by the leveler that has been rotated upward from the leveling posture over a predetermined angle. The force (torque) is proportional to the amount of rotation of the leveler. Therefore, the leveler in the leveling posture can be rotated upward, and a force is generated to return the leveler to the leveling posture according to the amount of rotation when the leveler rotates upward from the leveling posture over a predetermined angle. It becomes possible to make it.

It is appropriate to use a torsion coil spring or a double torsion spring with a small mounting space for the spring member disposed in the hinge portion.
A torsion coil spring has one coil part, and a double torsion spring has two coil parts arranged side by side. In the double torsion spring, since the torsional moments of the two coil parts work simultaneously, a double urging force can be obtained even with the same torsion angle as compared with the case of one coil part. This is preferable when the spring member is provided only in one hinge portion. Note that it is arbitrary whether torsion coil spring or double torsion spring is used. It is also possible to use both of these spring members.

  The wire diameter, inner diameter, winding angle, allowable torsion angle, arm length, etc. of the torsion coil spring or double torsion spring are arbitrary. Further, the spring constant of the torsion coil spring or the double torsion spring does not restrict the upward rotation of the leveler, and returns the leveler to the leveling posture according to the amount of rotation when the leveler rotates upward. It is set as appropriate to generate force.

  The apron and the leveler are connected to a spring member that applies an urging force to the leveler by rotating the leveler back in the direction of returning to the leveling posture by being pressed by the leveler that has rotated upward from the leveling posture over a predetermined angle. Since the hinge portion is provided, the leveler mounted on the apron by rotating upward can be rotated downward to return to the original leveling posture.

  As a result, even if the leveler rotates upward, if the mud surface with which the leveler contacts becomes horizontal, the leveler returns to the original leveling position, so it is possible to wear the skimmering machine at the end of the field. , You will be able to do enough for the occasion of drowning.

(A) is a side view of a scraping work machine provided with a double torsion spring for returning a leveler rotated upward to a leveling posture at a hinge part connecting an apron and a leveler. It is a rear view of the alternative working machine shown in FIG. It is a top view of the hinge part provided with the double torsion spring which returns the leveler rotated upwards to a leveling posture. It is a side view of the working machine part behind a tilling rotor, (a) shows the state where a leveler is in a leveling posture, and (b) shows the state where a leveler was flipped up toward the upper part.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

FIG. 1 shows a tilling rotor 6 that is mounted on the rear part of the tractor 20 and rotates around a horizontal axis by receiving power from the tractor 20, and a leveling posture and a soiling work posture (shown by a one-dot chain line in the figure) on the rear side. In a scraping work machine (hereinafter referred to as a work machine) 10 having an apron 4 and a leveler 5 which are arranged to be freely switchable to each other,
A double torsion spring (biasing member) that applies a biasing force to the leveler 5 by rotating the leveler 5 in a direction returning to the leveling posture by being pressed by the leveler 5 that has rotated upward from the leveling posture over a predetermined angle. ) 1 indicates the working machine 10 disposed in the hinge portion 45 that connects the apron 4 and the leveler 5.

  As shown in FIG. 1, the main body 10A of the work machine 10 includes a top mast 11 connected to a three-point link hitch mechanism including a top link and a lower link at the rear of the tractor, and a lower link connecting portion 12, and this three-point link hitch. It is attached to the rear part of the tractor via a mechanism so as to be movable up and down. A gear box 13 connected to the PTO output shaft of the tractor via a joint shaft having a universal joint, a transmission shaft, and the like is disposed at the lower end of the top mast 11, and the transmission frame extends from the gear box 13 to the width direction of the main body 10A. 14 and the support frame 15 are erected (see FIG. 2). The power from the PTO output shaft is transmitted to the PIC input shaft 13 a of the gear box 13, and the power received by the PIC input shaft 13 a is transmitted to the transmission shaft inserted through the transmission frame 14.

  As shown in FIG. 2, a chain transmission case 16 is fixed to the distal end portion of the transmission frame 14 so as to hang down, and an end cover 17 facing the chain transmission case 16 is fixed to the distal end of the support frame 15. As shown in FIG. 1, the rotary shaft 7 of the tilling rotor 6 is installed between the chain transmission case 16 and the end cover 17 so as to be rotatable about a horizontal axis. A chain is stretched between the chain transmission case 16 and the rotary shaft 7, and the power of the transmission shaft is transmitted to the rotary shaft 7 through the chain. The shield cover 2 is joined to the chain transmission case 16 and the end cover 17 at end plates 21 and 21 at both ends thereof.

  As shown in FIG. 1, tilling claws 8 project from the outer periphery of the rotary shaft 7 at an appropriate interval in the circumferential direction, and the tilling rotor 6 is constituted by the rotary shaft 7 and the tilling claws 8. The tilling claws 8 are arranged in the axial direction of the rotary shaft 7 with an interval that does not interfere with each other. The tilling claws 8, 8 adjacent to each other in the axial direction of the rotary shaft 7 are arranged at an angle with respect to the center of the shaft, for example, and the tip of the tilling claws 8 draws a rotation locus indicated by a two-dot chain line in the whole of the tilling rotor 6. .

  Under the transmission frame 14 and the support frame 15, there is disposed a shield cover 2 that covers the rotation range of the tilling claw 8 and protects the main body 10A of the work machine 10 from earth and sand (see FIG. 2). As shown in FIG. 2, the shield cover 2 has lower brackets 14a and 15a protruding below the transmission frame 14 and the support frame 15 joined to a connecting member 2a protruding on the upper surface (outer peripheral surface) thereof. Is supported by both frames 14 and 15.

  A leveling plate 3 for leveling the cultivated soil surface of the field is connected to the rear portion of the shield cover 2 so as to be rotatable about a horizontal axis. The leveling body 3 includes an apron 4 connected to the rear part of the shield cover 2 so as to be rotatable about a horizontal axis, and a leveler 5 connected to the rear part of the apron 4 so as to be rotatable about a horizontal axis. The posture control of the ground leveling body 3 is performed by a earthing operation device 9 having a motor (not shown) provided on the top mast 11 and an operating rod 9b for connecting the motor and the leveling body 3.

  As shown in FIG. 1, the earthing operation device 9 has an operation rod 9 b that has two upper and lower stages, and a joint portion between the upper operation rod 9 b 1 and the lower operation rod 9 b 2 is inclined from the rear portion of the top mast 11 toward the rear of the machine body. It is rotatably supported by a swing arm (swinging arm) 9a extending upward. A round pipe material is used for the upper operation rod 1b1 arranged on the top mast 11 side, whereas the lower operation rod 1b2 arranged on the leveler 5 side opens toward the front side in the traveling direction (tractor side). A U-shaped channel material is used and is supported from the outside by a connecting member 5a described later.

  The upper operation rod 9b1 is provided with a compression coil spring (not shown) for controlling the posture of the leveling body 3 in the length direction thereof. The operation rod 9b is retracted toward the top mast 11 and extended toward the leveler 5. Operation is enabled. The operation of the operation rod 9b (drawing and feeding operation) is switched by an electric motor or an operation lever (not shown) disposed on the top mast 11.

  The upper operation rod 9b1 and the electric motor or the operation lever are connected to each other via a swing member 9d that is swingably supported by the top mast 11. The swing member 9d is formed with an engagement hole 9e that slides and moves the lock portion 9c at the upper end of the operation rod 9b. The swing hole 9d is swung by an electric motor or an operation lever. By slidably moving the lock portion 9c along the shape of 9e, the operation of the operating rod 9b (drawing and feeding operation) is switched, and the leveler 5 can be switched between the leveling posture and the earthing work posture. The

In this case, when the operating rod 9b is pulled toward the top mast 11 by operating the electric motor or the operating lever, the leveler 5 is leveled to perform the scraping operation as shown in FIGS. When the operating rod 9b is extended toward the leveler 5 side (the rotation free position where the leveler 5 is free to rotate in the vertical direction), the leveler 5 is moved to the earthing work position (FIG. 1). As shown by the one-dot chain line, the leveler 5 stands up and down).
In addition, the code | symbol 9f in FIG. 1 shows the pin which connects the swing arm 9a, the upper side operation rod 9b1, and the lower side operation rod 9b2 so that rotation is mutually possible.

  As shown in FIGS. 1 to 4, the lower end portion of the lower operation rod 9 b 2 is connected to be rotatable about a horizontal axis by a connection member 5 a on the upper surface of the leveler 5. The connection member 5a uses a U-shaped channel material that opens upward, and the lower end portion of the lower operation rod 9b2 and the connection member 5a are connected by a pin 5b penetrating both of them. Further, the connecting member 5 a is fixed on a pedestal 5 c integrated with the leveler 5.

  The front portion of the connecting member 5a is a leveler side connecting portion 5d, and the leveler side connecting portion 5d sandwiches the apron side connecting portion 4a rounded around the horizontal axis at the rear end of the apron 4 from both sides in the body width direction. In this state, it is connected to the apron side connecting portion 4a so as to be rotatable about a horizontal axis. The apron side connection portion 4a and the leveler side connection portion 5d are connected by a hinge pin (axial center rod) 5e that passes through the leveler side connection portion 5d and passes through the inside of the apron side connection portion 4a. A connecting portion between the apron side connecting portion 4 a and the leveler side connecting portion 5 c forms a hinge portion (connecting portion) 45 between the apron 4 and the leveler 5. As shown in FIG. 2, the hinge portion 45 is provided at the center in the longitudinal direction of the apron 4 and the leveler 5. A double torsion spring (spring member) 1 is disposed on the hinge portion 45.

  As shown in FIG. 2, the double torsion spring 1 has its two coil portions 1a and 1a (the coil winding method is different, left-handed and right-handed) arranged on both sides (outside) in the width direction of the leveler-side connecting portion 5c. In this state, it is arranged around the hinge pin 5e. Further, the two arm portions (second arm portions) 1c and 1c extending from the both ends in the width direction of the coil portions 1a and 1a of the double torsion spring 1 to the rearward direction (leveler 5 side) are leveler 5 in the leveling posture. When there is, it touches the upper surface of the leveler 5 (pedestal 5c) by its own weight. Further, an arm part (first arm part) 1b extending forward (forward side of the apron 4) between the coil parts 1a and 1a is coiled by a leveler 5 rotated upward from the leveling posture by a predetermined angle. As 1a, 1a rotates, it contacts the upper surface 4b of the apron 4 (see FIGS. 1, 3, and 4).

  That is, if the leveler 5 does not exceed a predetermined angle when the leveler 5 rotates upward, the arm portion 1b of the double torsion spring 1 is not in contact with the upper surface 4b of the apron 4 and is not pressed, so that it is in a leveling posture. No biasing force is applied to the leveler 5 from the double torsion spring 1. On the other hand, when the leveler 5 in the leveling posture rotates upward over a predetermined angle, the arm portions 1c and 1c in contact with the leveler 5 and the arm portion 1b in contact with the upper surface 4b of the apron 4 As the portions 1a and 1a are twisted, the double torsion spring 1 generates a torsional moment (torque).

  That is, it is possible to generate a force (torque) for returning the leveler 5 to the leveling posture by twisting the coil portions 1a and 1a by the leveler 5 that has rotated upward from the leveling posture over a predetermined angle. Further, the force (torque) is proportional to the amount of rotation of the leveler 5, and the leveler 5 is placed in a leveling posture while the force for rotating the leveler 5 upward is applied by the shape of the mud surface with which the leveler 5 is in contact. The returning force continues to be applied to the leveler 5. Therefore, the leveler 5 in the leveling posture can be rotated upward, and the leveler 5 is returned to the leveling posture according to the amount of rotation when the leveler 5 is rotated upward from the leveling posture over a predetermined angle. Force can be generated.

  Instead of the above configuration, the arm portion (first arm portion) 1b extending to the front side (apron 4 side) of the double torsion spring 1 is joined to the upper surface 4b of the apron 4, and the rear side in the forward direction (leveler 5). The arm portions (second arm portions) 1c, 1c extending to the side) may be in contact with the upper surface of the leveler 5 rotated upward from the leveling posture by a predetermined angle. Also in this manner, the leveler 5 in the leveling posture can be rotated upward as described above, and the rotation when the leveler 5 is rotated upward from the leveling posture upward by a predetermined angle. It is possible to generate a force for returning the leveler 5 to the leveling posture according to the amount of movement.

  Therefore, when the leveler 5 is placed on the reed or the slope of the reed or is pulled by the tractor 20 and descends the reed of the reed, the leveler 5 rotates upward as shown in FIG. Even if it is placed on the apron 4, the mud surface with which the leveler 5 is in contact is returned to the original leveling posture shown in FIG. In other words, since the leveler 5 rotated upward can be rotated downward to return to the original leveling posture, it is possible to wear the work machine 10 at the end of the field. As a result, it will be possible to carry out sufficient scratching.

DESCRIPTION OF SYMBOLS 1 ... Double torsion spring (torsion coil spring, spring member), 1a ... Coil part, 1b ... Arm part (1st arm part), 1c ... Arm part (2nd arm part),

2 ... Shield cover, 2a ... Connecting material, 21 ... End plate,

3 ... Leveling plate, 4 ... Apron, 4a ... Apron side connection part, 4b ... Upper surface, 5 ... Leveler, 5a ... Connection member, 5b ... Pin, 5c ... Base, 5d ... Leveler side Connection part, 5e …… Hinge pin (axial center rod), 45 …… Hinge part (connection part)
6 ... Tillage rotor, 7 ... Rotary shaft, 8 ... Nail,

DESCRIPTION OF SYMBOLS 9 ... Digging operation apparatus, 9a ... Swing arm (oscillation arm), 9b ... Operation rod, 9a1 ... Upper operation rod, 9a2 ... Lower operation rod, 9c ... Lock part, 9d ... Oscillation Member, 9e ...... engagement hole,

10: Scraping work machine, 10A: Main body, 11: Top mast, 12: Lower link connecting part, 13: Gear box, 13a: PIC input shaft,
14: Transmission frame, 14a: Lower bracket,
15: Support frame, 15a: Lower bracket,
16 …… Chain transmission case, 17 …… End cover,
20 …… Tractor

Claims (2)

A tilling rotor mounted on the rear part of the tractor and rotating around a horizontal axis by receiving power from the tractor, and an apron and a leveler arranged on the rear side thereof so as to be switchable between a leveling position and a soiling work position. In the scratching machine,
A spring member that applies a biasing force to the leveler to rotate the leveler in a direction to return to the leveling posture by being pressed by the leveler that has rotated upward from the leveling posture over a predetermined angle. And the leveler are arranged in a hinge portion for connecting the leveler. The spring member includes a coil portion disposed around a hinge pin of the hinge portion, a first arm portion extending from the coil portion to the front side in the traveling direction and contacting the apron, and a rear side in the traveling direction from the coil portion. And a second arm portion extending in contact with the leveler. 2. The scraping work machine according to claim 1, further comprising: a second arm portion extending in contact with the leveler.

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