JP5297837B2 - Pricking machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a puddling implement capable of returning a leveler to the original land-leveling attitude even when being placed on a levee or a slope at the vicinity of the levee, or even when the leveler is turned upward when descending the slope of the levee by being pulled by a tractor. <P>SOLUTION: In the puddling implement 10 including a soil-drawing operation device 1 capable of freely switching the leveler 5 between a land-leveling attitude and a soil-drawing operation attitude by operating an operation rod 1b, the soil-drawing operation device 1 is provided with a leveler attitude-controlling part 1h having a tension coil spring 1j for adding, to the leveler 5, an urging force for turning the leveler 5 to the direction returning to the land-leveling attitude by being pushed by the leveler 5 turned upward over a prescribed angle from the land-leveling attitude. As a result, the leveler 5 placed on the levee or the slope at the vicinity of the levee, or turned upward when descending the slope of the levee by being pulled by the tractor is returned to the land-leveling attitude by the urging force of the tension coil spring 1j as the muddy soil surface is positioned toward the horizontal direction to enable the puddling implement 1 to approach the levee side. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

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 attitude of the leveling body 6 is arranged along the upper side of the upper operation rod. Then, when the leveling body operating lever 22 pulls the operation rod toward the top mast 2 side, the leveling body 6 performs the ground leveling posture for performing the scraping work (the second leveling body (leveler) 61 is rotated in the vertical direction). When the operating rod is extended to the leveling body 6 side and the leveling body 6 is moved to the leveling body 6 side, the earth leveling body 6 is placed in the earthing work posture (the second leveling body (leveler) 61 stands up and down). State).

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 possibility of being inverted on the first leveling body (apron) 60 (see FIG. 5C).
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 tiller working machine mounted on a rear portion of a tractor via a top mast and receiving a power from the tractor and rotating around a horizontal axis, and a leveler disposed behind the rotor. A swing arm extending rearward from the rear portion of the top mast, and an operation rod rotatably supported by the swing arm and connecting the top mast and the leveler, and operating the operation rod. In the scraping work machine equipped with the earthing operation device that can switch the leveler between the leveling posture and the earthing work posture,
When the leveling operation device is pressed by the leveler rotated upward from the leveling posture over a predetermined angle, an urging force for rotating the leveler in a direction returning to the leveling posture is applied to the leveler. A leveler attitude control means having an urging member to be added is provided, and the leveler attitude control means is provided between the lower end portion of the operating rod and the upper surface of the leveler so as to be rotatable about a horizontal axis. And an urging member installed between the operating rod and the rotating member, and the rotating member is disposed at one end of the urging member on the front side in the advancing direction of the machine body with the rotating shaft interposed therebetween. Is configured such that an abutting portion is formed on the rear side in the traveling direction of the machine body so that the leveler abutted upward from the leveling posture by more than a predetermined angle comes into contact .
According to a second aspect of the present invention, there is provided a tiller working machine mounted on a rear portion of a tractor via a top mast, and receives a power from the tractor and rotates around a horizontal axis, and a leveler disposed behind the tiller rotor. A swing arm extending rearward from the rear portion of the top mast, and an operation rod rotatably supported by the swing arm and connecting the top mast and the leveler, and operating the operation rod. In the scraping work machine provided with the earthing operation device that can switch the leveler between the leveling posture and the earthing work posture, the leveler rotated by the earthing operation device over a predetermined angle upward from the leveling posture. And a leveler posture control means having a 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 to the leveler. The leveler posture control means includes a link member having both ends rotatably installed between the swing arm and the operation rod, and is arranged along a length direction of the link member. And the urging member that is prevented from being removed by the operation rod, and the link member is moved together with the operation rod by the leveler rotated upward from the leveling posture by a predetermined angle upward at a middle portion in the longitudinal direction. It has a locking part that compresses the other end of the urging member.

  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, an urging force that applies a biasing force to the leveler to rotate the leveler back in the direction to return to the leveling posture by being pressed by the leveling operation work device by the leveler that has rotated upward from the leveling posture by more than a predetermined angle. By providing the leveler posture control means having the members, the leveler can be returned to the original leveling posture if the mud surface with which the leveler comes in contact becomes horizontal. As a result, even if the chamfering work is started from the state where the chamfering machine is brought closer to the heel and the leveler is mounted on the crest, the leveler rotated upward is rotated downward to the original leveling posture. Since it can be returned, desired scraping work can be performed.

  The operation rod can be operated (retraction operation to the top mast side and extension operation to the leveler side) by a compression coil spring (not shown) arranged along the upper side (top mast portion). The operation of the operating rod (withdrawing and feeding operation) is switched when a manual operation lever is used or when a motor (such as an electric motor, an electric hydraulic motor, or a hydraulic motor) operated by a remote control is used. The operation lever or motor is connected to the upper side of the operation rod at the top mast portion, and the operation of the operation rod (retraction and extension operation) is switched to switch the leveler between the leveling posture and the earthing work posture.

Applying an urging force that rotates the leveler toward the leveling posture to the leveler means applying an urging force directly or indirectly to the leveler, and applying the urging force to the leveler itself (directly) If, Ru to return to leveling attitude leveler by operating by adding a biasing force to the operating rod (feeding operation) (indirectly) Togaa.

  As an urging member that applies a urging force that rotates the leveler toward the leveling posture to the leveler, if it is arranged along the length direction of the operation rod, it will lead to prevention of mud adhesion and damage, for example, Spring members (tensile coil springs, compression coil springs, thin plate springs), cylinders (gas, oil), rubber, etc. are suitable. Any of these may be used alone or in combination.

When a tension coil spring or a compression coil spring is used as the urging member, the spring constant does not restrict the upward rotation of the leveler, and the leveler depends on the amount of rotation when the leveler rotates upward. Is appropriately set so as to generate a force to return the ground to a leveling posture.
Further, the wire diameter, outer diameter, and free height of the tension coil spring and compression coil spring are arbitrary.

When the urging force of the urging member is directly applied to the leveler, the use of the tension coil spring as the urging member is advantageous in that the structure is simplified as compared with the case where the compression coil spring is used.
Therefore, the leveler posture control means is provided between a rotating member provided so as to be rotatable about a horizontal axis between the lower end portion of the operating rod and the upper surface of the leveler, and between the rotating member and the operating rod. And an urging member (tensile coil spring). The rotating member has one end portion of the urging member (pulling coil spring) locked to the front side (tractor side) of the airframe with the rotating shaft interposed therebetween, and the rear side of the airframe (anti-tractor). The leveler is in contact with the leveler that has been rotated upward from the leveling posture by more than a predetermined angle (Claim 1 ), so that the leveler in the leveling posture can be rotated upward. In addition, it is possible to generate a force that returns 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 upward.

The rotating member is provided between the lower end of the operating rod and the upper surface of the leveler so as to be rotatable about the horizontal axis. The lower end of the operating rod and the upper surface of the leveler are connected to each other so as to be rotatable about the horizontal axis. This means that the rotation member having the rotation axis as the rotation center axis is provided at the hinge portion which is a joint portion between the lower end portion of the operation rod and the upper surface of the leveler. Also, the biasing member (tensile coil spring) installed between the rotating member and the operating rod has one end locked to the front side (tractor side) of the rotating member and the other end operated. The rod is locked to the middle portion in the longitudinal direction of the rod.
When a leveler that has rotated more than a predetermined angle upward from the leveling posture comes into contact with the contact portion formed on the rear side (opposite tractor side) of the rotating member in the advancing direction, the leveler faces upward beyond the predetermined angle. This means that the abutting portion and the leveler do not come into contact with each other unless the pivoting member is rotated, and the biasing force is not applied from the rotating member to the leveler in the leveling posture.
In addition, when directly applying the urging force of the urging member to the leveler, it is optional to use either the tension coil spring or the compression coil spring for the urging member.
In addition, instead of the tension coil spring that rotates the rotating member, the rotating member can be rotated using a torsion coil spring or a double torsion spring.

In addition, when the urging force of the urging member is indirectly applied to the leveler, that is, when the urging force is applied to the operation rod, the compression coil spring is used as the urging member than when the tension coil spring is used. This is advantageous in that the structure is simplified.
Therefore, the leveler posture control means is arranged along the length direction of the link member having both ends pivotably provided between the swing arm and the operation rod, and one end portion of the operation rod. And an urging member (compression coil spring) that is prevented from coming off by the above. Further, the link member has a locking portion that compresses the other end portion of the biasing member (compression coil spring) together with the operation rod by a leveler rotated upward from a leveling posture over a predetermined angle at an intermediate portion in the longitudinal direction. (Claim 2 ), the leveler in the leveling posture can be rotated upward, and the rotation when the leveler rotates upward from the leveling posture over a predetermined angle upward. A force for returning the operating rod to the leveling posture according to the amount of movement, in other words, a force for returning the leveler to the leveling posture can be generated.

The fact that both end portions of the link member are rotatably installed between the swing arm and the operation rod means that both end portions of the link member are connected to the swing arm and the operation rod so as to be rotatable. This means that the link member can follow the movement of the moving arm and the operating rod, that is, the leveler, and does not restrict the movement. Further, the biasing member (compression coil spring) arranged along the length direction of the link member has one end portion (lower end portion) thereof prevented from coming down by the operating rod, and the other end portion (upper end portion). Is free, and when the leveler in the leveling posture rotates upward over a predetermined angle, it abuts against the engaging portion of the link member and compresses the biasing member (compression coil spring). That is, if the predetermined level is not exceeded when the leveler is rotated upward, the locking portion and the biasing member (compression coil spring) are not in contact with each other, and the biasing member (compression coil spring) is not compressed. No biasing force is applied to the leveler from the operating rod.
In addition, when the urging force of the urging member is indirectly applied to the leveler, it is optional to use either the tension coil spring or the compression coil spring for the urging member.

The earthing operation device has a biasing member that applies a biasing force to the leveler to rotate the leveler back in the 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. Since the leveler posture control means is provided, the leveler placed 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.

In a scraping work machine in which a leveler posture control means having a tension coil spring as an urging member is disposed along the operation rod, (a) shows a state in which the extension work machine connected to the work machine body is folded and stored. It is the side view shown, and shows the state in which the leveler is in the leveling posture and the earthing work posture (indicated by a one-dot chain line in the figure), (b) is a side view in which the folded extension work machine is omitted, It shows a state in a leveling posture and a state in which it is flipped up. It is a rear view of the scraping work machine which developed the extension work machine shown in Drawing 1 (a). (A) is a sectional side view of the leveler posture control means of FIGS. 1 and 2, and (b) is a perspective view of a stopper (rotating member). FIG. 4 is a rear view of FIG. It is the side view which showed the state which installed the leveler attitude | position control means with a compression coil spring between the operating rod and the swing arm, (a) is a state in which the leveler is in the earthing work attitude, (b) is the leveler A state in the leveling posture, (c) shows a state in which the leveler is flipped upward.

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

1 (a) and 1 (b) are attached to the rear part of a tractor 20 via a top mast 11 and receive a power from the tractor 20 and rotate around a horizontal axis, and a leveler 5 disposed behind them. And a swing arm 1a extending rearward from the rear portion of the top mast 11 and an operation rod 1b rotatably supported by the swing arm 1a and connecting the top mast 11 and the leveler 5. In a scraping work machine (hereinafter referred to as a work machine) 10 provided with a digging operation device 1 that is capable of operating the operating rod 1b to switch the leveler 5 between a leveling position and a earthing work position.
A pull that applies a biasing force to the leveler 5 to rotate the leveler 5 in a direction to return to the leveling posture by being pressed by the leveling operation device 1 by the leveler 5 rotated upward from the leveling posture over a predetermined angle. The working machine 10 provided with the leveler attitude | position control part 1h (leveler attitude | position control means) which has the coil spring (biasing member) 1j is shown.

  As shown in FIG. 1A, 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 20, and a lower link connecting portion 12. It is attached to the rear part of the tractor 20 via a three-point link hitch mechanism so as to be able to be raised and lowered. A gear box 13 connected to the PTO output shaft of the tractor 20 via a joint shaft having a universal joint, a transmission shaft, and the like is disposed at the lower end portion of the top mast 11, and is transmitted from the gear box 13 in the width direction of the main body 10A. The frame 14 and the support frame 15 are installed (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.

  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. A 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 around 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.

  A tilling claw 8 protrudes 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 claw 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 and 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 in the entire tilling rotor 6 is a two-dot chain line in FIG. Draw the rotation trajectory indicated by.

  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 attitude control of the ground leveling body 3 is performed by the earthing operation device 1 having a motor (not shown) provided in the top mast 11 portion and an operating rod 1b for connecting the motor and the leveling body 3. In addition, the description about the earth-loading operation apparatus 1 is mentioned later.

  FIG. 2 shows a state in which the extension work machine 30 that is foldably connected to both sides in the width direction of the main body 10A is developed.

  As shown in FIG. 2, the extension work machine 30 includes a tilling rotor 34 that rotates simultaneously with the tilling rotor 6 when deployed, a shield cover 31 that covers the top of the tilling rotor 34, and end plates 32 that are located on both sides in the width direction of the shield cover 31 ( a), and the end plate 32 is connected to the end plate 21 of the main body 10A so as to be unfolded and folded. For example, as shown in FIG. 1A, the extension work machine 30 is connected to the main body 10A so as to be rotatable around an axis inclined in the vertical direction with respect to the traveling direction. The tilling rotor 34 of the extension work machine 30 receives power from the tilling rotor 6 by being connected to the rotary shaft 7 of the tilling rotor 6 of the main body 10A via a clutch during deployment.

  The extension work machine 30 is connected by a pin 23 or the like to a bracket 22 protruding from the upper side of the end plate 21 in the main body 10A at a position closer to the rear side of the end plate 32 in the bracket 33 protruding from the upper side of the end plate 32. As a result, it is connected in a state where it can be expanded and retracted. The extended state and the retracted state of the extension work machine 30 are restrained by the restraining device 35 that holds the respective states.

  As shown in FIG. 2, a leveling plate 3 for leveling the mud surface of the field is connected to the rear of the main body 10A, but the extension work machine 30 is connected to the leveling plate 3 of the main body 10A in its unfolded state. The resulting leveling plate 36 is connected. The leveling plate 36 includes an apron 37 connected to the rear part of the shield cover 31 so as to be rotatable about a horizontal axis, and a leveler 38 connected to the rear part of the apron 37 so as to be rotatable about the horizontal axis. Further, an auxiliary ground leveling plate 39 that pushes muddy water and dredged material existing behind the work machine 10 toward the center in the width direction of the work machine 10 is connected to the width direction outside of the leveling board 36 of the extension work machine 30. Is done.

Here, the earthing operation device 1 will be described.
As shown in FIG. 1B, the operating rod 1b has two upper and lower stages, and the joint portion of the upper operating rod 1b1 and the lower operating rod 1b2 extends obliquely upward from the rear part of the top mast 11 toward the rear of the machine body. The swing arm (swinging arm) 1a is supported so as to be rotatable (bendable). 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 a tension coil spring 1j, which will be described later, is installed inside the channel material.

  The upper operation rod 1b1 is provided with a compression coil spring (not shown) for controlling the attitude of the leveling body 3 in the length direction thereof. The operation rod 1b is retracted toward the top mast 11 and extended toward the leveler 5. Operation is possible. Switching of the operation rod 1b operation (retraction and extension operation) is performed by an electric motor (not shown) disposed on the top mast 11.

  The upper operating rod 1b1 and the electric motor are connected to each other via a swing member 1d that is swingably supported by the top mast 11. The swing member 1d is formed with an engagement hole 1e for slidingly moving the lock portion 1c at the upper end of the operation rod 1b. The swing member 1d is swung by an electric motor to form the engagement hole 1e. By moving the lock portion 1c in sliding contact with each other, the operation (drawing and feeding operation) of the operation rod 1b is switched, and the leveler 5 and the leveler 38 can be switched between the leveling posture and the earthing work posture. The In this case, when the operating rod 1a is pulled toward the top mast 11 by operating the electric motor, the leveler 5 and the leveler 38 are leveled to perform the scraping work (the vertical rotation of the leveler 5 and the leveler 38). When the operating rod 1b is extended toward the leveler 5 side, the leveler 5 and the leveler 38 are in the earthing work position (one point in FIG. 1 (a)). As shown by the chain line, the leveler 5 stands up and down).

  As shown in FIGS. 1 to 4, the lower end of the operating rod 1b, that is, the lower end of the lower operating rod 1b2 is rotated around the horizontal axis while being sandwiched from both sides of the body width direction by the hinge 5a on the upper surface of the leveler 5. Connect freely. The lower end portion of the lower operation rod 1b2 and the hinge portion 5a are connected by a pin 5b, and a leveler posture control unit (leveler posture control means) 1h is disposed in the vicinity of the pin 5b.

  The leveler posture control unit 1h includes a stopper (rotating member) 1i having the pin 5b as a rotation center axis, and a tension coil spring (biasing member) 1j installed between the stopper 1i and the operation rod 1b.

  The stopper 1i is disposed between the lower end portion of the lower operation rod 1b2 and the hinge portion 5a, and a pin hole 1k through which the pin 5b is inserted is formed in the middle portion in the length direction. A locking portion 1m to which the lower end portion of the tension coil spring 1j is locked is disposed on the front side (tractor side) and above the pin hole 1k, and the rear side in the traveling direction (counter tractor side) and On the lower side, a contact portion 1n with which the leveler 5 that has rotated upward from the leveling posture over a predetermined angle contacts is disposed. The contact portion 1n does not contact the leveler 5 unless the leveler 5 rotates upward beyond a predetermined angle, and does not apply a biasing force to the leveler 5 in the leveling posture. Further, the upper end portion of the tension coil spring 1j is locked to a locking pin 1o provided on the middle side in the length direction of the operating rod 1a.

  Thereby, the leveler 5 in the leveling posture can be rotated upward according to the mud surface with which the leveler 5 is in contact, and the leveler 5 has been rotated upward from the leveling posture upward over a predetermined angle. In this case, the stopper 1 i is rotated by being pressed by the leveler 5, and the pulling coil spring 1 j is pulled by the rotated stopper 1 i, whereby a force (biasing force) for returning the leveler 5 to the leveling posture is an amount of rotation of the leveler 5. Proportionally generated, the force is applied from the contact portion 1n to the leveler 5 as a force for returning to the leveling posture. While the force that rotates the leveler 5 upward is applied by the mud surface with which the leveler 5 is in contact, the force that returns the leveler 5 to the leveling posture is continuously applied to the leveler 5.

  Therefore, the leveler 5 may be placed on the heel or the slope of the heel, or may be rotated upward and placed on the apron 4 when being pulled by the tractor 20 and going down the heel slope. However, the muddy surface with which the leveler 5 is in contact is returned to the original leveling posture from the state where the mud surface is spun up as it becomes horizontal. That is, since the leveler 5 that has been rotated upward can be rotated downward to return to the original leveling posture, it is possible to wear the skimming work machine 10 at the end of the field. It becomes possible, and it becomes possible to carry out the scratching on the heel.

Next, the leveler attitude control unit 1h using a compression coil spring will be described.
As shown in FIGS. 5 (a) to 5 (c), the leveler posture control unit 1h is constructed such that both ends thereof are freely rotatable between a swing arm (swinging arm) 1a and a lower operation rod 1b2. It has a link member 1p and a compression coil spring (biasing member) 1q that is arranged along the length direction of the link member 1p, and whose one end is prevented from coming off by the lower operation rod 1b2. Even if the leveler 5 is in the earthing work posture as shown in FIG. 5 (a) or the leveler 5 is in the leveling posture as shown in FIG. 5 (b), the link member 1p has the swing arm 1a and This means that the lower operation rod 1b2, that is, the leveler 5 can be swung in accordance with the movement of the leveler 5, and the movement is not restricted.

  Further, the link member 1p has a locking portion that compresses the compression coil spring 1q together with the operation rod 1b pressed upward by the leveler 5 that has rotated upward from the leveling posture over a predetermined angle at the intermediate portion in the longitudinal direction. 1r. That is, the lower end of the compression coil spring 1q is prevented from coming down by the operating rod 1b, the upper end is free, and the leveler 5 in the leveling posture is upwardly set at a predetermined angle as shown in FIG. 5 (c). When the lower operating rod 1b2 is pulled toward the top mast 11 when it is rotated beyond the upper end, the upper end of the lower operating rod 1b2 comes into contact with the locking portion 1r of the link member 1p and is compressed.

  That is, if the leveler 5 does not exceed a predetermined angle when the leveler 5 is rotated upward, the compression coil spring 1q is not in contact with the locking portion 1r and is not compressed. No biasing force is applied from the side operation rod 1b2. On the other hand, when the leveler 5 in the leveling posture rotates upward over a predetermined angle, the lower operation rod 1b2 is retracted to the top mast 11 side so that the upper end portion of the compression coil spring 1q is linked to the link member. The leveling posture of the lower operation rod 1b2 is adjusted according to the amount of rotation when the leveler 5 is rotated upward beyond a predetermined angle upward from the leveling posture by contacting and compressing the locking portion 1r of 1p. It is possible to generate a force that returns the leveler 5 to the 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 force for returning the leveler 5 to the leveling posture is continuously applied to the leveler 5.

  Therefore, the leveler 5 may be placed on the heel or the slope of the heel, or may be rotated upward and placed on the apron 4 when being pulled by the tractor 20 and going down the heel slope. However, the muddy surface with which the leveler 5 is in contact is returned to the original leveling posture from the state where the mud surface is spun up as it becomes horizontal. That is, since the leveler 5 rotated upward can be returned to the original leveling posture, it becomes possible to put the cutting work machine 10 on the heel that is the most behind the field, and to take the rake on the heel. You will be able to do enough.

DESCRIPTION OF SYMBOLS 1 ... Digging operation apparatus, 1a ... Swing arm (oscillation arm), 1b ... Operation rod, 1b1 ... Upper operation rod, 1b2 ... Lower operation rod, 1c ... Lock part, 1d ... Oscillation Member, 1e ... engagement hole,

1h... Leveler posture control unit (leveler posture control means), 1i... Stopper (rotating member), 1j... Tension coil spring (biasing member), 1k... Pin hole, 1m. ... abutting part, 1o ... locking pin, 1p ... link member, 1q ... compression coil spring, 1r ... locking part,

2 ... Shield cover, 2a ... Connecting material, 21 ... End plate, 22 ... Bracket, 23 ... Pin,
3 ... Leveling plate, 4 ... Apron, 5 ... Leveler, 5a ... Hinge, 5b ... Pin,
6 ... Tillage rotor, 7 ... Rotary shaft, 8 ... Nail,

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,
30 ... Extension work machine, 31 ... Shield cover, 32 ... End plate, 33 ... Bracket, 34 ... Tilling rotor, 35 ... Restraining device, 36 ... Leveling plate, 37 ... Apron, 38 ... Leveler, 39 …… Auxiliary leveling board

Claims (2)

A tilling rotor mounted on the rear part of the tractor via a top mast, receiving power from the tractor and rotating around a horizontal axis, and a leveler disposed behind the rotor.
A swing arm extending rearward from a rear portion of the top mast, and an operation rod rotatably supported by the swing arm, and connecting the top mast and the leveler; and operating the operation rod In the scraping work machine provided with the earthing operation device that can switch the leveler between the leveling posture and the earthing work posture,
When the leveling operation device is pressed by the leveler rotated upward from the leveling posture over a predetermined angle, an urging force for rotating the leveler in a direction returning to the leveling posture is applied to the leveler. Leveler posture control means having a biasing member to be added is provided ,
The leveler attitude control means is installed between a rotating member provided so as to be rotatable about a horizontal axis between a lower end portion of the operating rod and the upper surface of the leveler, and between the operating rod and the rotating member. Biasing member,
One end of the urging member is locked to the front side of the aircraft in the direction of travel of the airframe across the rotation axis, and the rotational member rotates beyond the predetermined angle upward from the leveling posture on the rear side of the direction of travel of the airframe. A scraping work machine characterized in that a contact portion with which the leveler contacts is formed . A tilling rotor mounted on the rear part of the tractor via a top mast, receiving power from the tractor and rotating around a horizontal axis, and a leveler disposed behind the rotor.
A swing arm extending rearward from a rear portion of the top mast, and an operation rod rotatably supported by the swing arm, and connecting the top mast and the leveler; and operating the operation rod In the scraping work machine provided with the earthing operation device that can switch the leveler between the leveling posture and the earthing work posture,
When the leveling operation device is pressed by the leveler rotated upward from the leveling posture over a predetermined angle, an urging force for rotating the leveler in a direction returning to the leveling posture is applied to the leveler. Leveler posture control means having a biasing member to be added is provided,
The leveler attitude control means is arranged along a length of the link member, with both ends pivotably provided between the swing arm and the operation rod, and one end portion of the leveler posture control means. The urging member that is prevented from coming off by the operating rod,
The link member has a locking portion that compresses the other end portion of the urging member together with the operation rod by the leveler rotated upward from a leveling posture by a predetermined angle upward at a middle portion in the length direction. A scraping work machine characterized by

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