JP6738584B2 - Twin rake - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin rake having rakes on the left and right of a main frame, and more particularly to a twin rake adapted to follow the unevenness of a field.

As a twin rake for performing grass collecting work, there is a twin rake in which a subframe 102 is extended in the left-right direction from a main frame 101 extending in the vertical direction and a rake 103 is provided on the subframe 102, as shown in FIG. Such a twin rake has an advantage that the right and left grass collecting widths can be greatly adjusted, and the left and right width can be reduced when the left and right subframes are folded upward.

By the way, in such a twin rake, a width adjusting mechanism that adjusts the width of the left and right rakes 103, a folding mechanism that allows the left and right widths to be narrowed when moving, and a rake that follows the unevenness of the field. A rocking mechanism or the like is required. For this reason, if all of these functions are to be provided, the total weight of the twin rake becomes heavy. Therefore, conventionally, the tire 104 is provided behind the main frame 101 and the tire 105 is provided below the rake 103. To support the whole (Patent Document 1, etc.). According to this structure, the load applied to the rear of the tractor can be suppressed, the load applied to the front wheels of the tractor can be maintained, and the steerability can be ensured.

JP, 09-220019, A

However, in the structure in which the entire twin rake is supported by such a method, the following problems occur.

That is, in the method of supporting the whole by providing the tire behind the main frame, since the main frame is supported across the rear tire and the tractor, if there is unevenness in the field in the central part of the main frame, that part Will not be able to follow the ground. Therefore, in the conventional art, as shown in FIG. 11, the subframe is freely tilted from the main frame when collecting grass (FIG. 11B), and the rake is hung from the subframe at one point and rocked (FIG. 11B). (A)), whereby the unevenness of the field is made to follow. However, in such a configuration, both the swing angle due to the single-point suspension and the tilt angle with respect to the main frame are summed up, and thus the swing angle during movement becomes large, and safety, strength, and durability are lacking. There was a problem that it would end up.

In view of the above problems, it is an object of the present invention to provide a twin rake having a simple structure that allows the rake to follow the unevenness of a field and reduce rattling of the rake.

That is, the present invention, in order to solve the above problems, a main frame along the traveling direction of the tractor, a sub-frame that extends in the left-right direction from the main frame and is fixed to the main frame so that it cannot be tilted when collecting grass, Rake provided on the left and right sub-frames, and one hydraulic cylinder for each of the left and right for rotating the left and right sub-frames upward and sliding the rake along the sub-frames with the sub-frames fixed horizontally For the attachment attached to the tractor side, the upper connection part is configured to accommodate a pin protruding upward from the main frame and to provide a hole portion that narrows the inner width toward the rear side of the main frame. In the twin rake, the lower connecting portion is provided with a connecting portion formed by providing a pin projecting from a rotatable sphere housed on the attachment side and a main frame side pin receiver fitted to the pin. The main frame is supported at three points of the tires provided below the left and right rakes and the connecting portion in front of the main frame.

Further, in such an invention, a cushioning material for suppressing the swing of the rake is provided between the rake and the sub-frame.

According to the present invention, the main frame is connected so as to be capable of rolling and pitching, and the width of the rake is adjusted and the sub-frame is folded by one hydraulic cylinder, so that the weight is significantly reduced. It is possible to support it at three points of the connecting portion between the lower tire and the main frame. This makes it possible to follow unevenness in the field and reduce rattling during movement to improve safety, strength, and durability. Further, by eliminating the tire behind the main frame, the whole can be made compact and the turning performance in the field can be improved.

1 is a schematic plan view of a twin rake showing an embodiment of the present invention. Rear view of the twin rake in the same configuration The figure which shows the sliding state of the one side of the rake in the same form. The figure which shows the state which folded the sub-frame in the same form. The figure which shows the expansion amount regulation part of the hydraulic cylinder in the same form. The figure which shows the folded state which looked at the sub-frame in the same form from the front The figure which shows the state which suspended the rake in the same form at one point on the subframe. The side view which shows the connection part of the attachment and the main frame in the same form. The figure which shows the upper side connection part of the attachment in the same form. Twin rake showing conventional example Figure showing a working example of twin rake when the field is uneven

An embodiment of the present invention will be described below with reference to the drawings.

In the twin rake 1 according to this embodiment, the weight of the left and right rakes 3 and the sub-frame 25 are folded by one hydraulic cylinder 42 to reduce the overall weight, and the main frame 21 is rolled and pitched. It is connected to the attachment 9 as much as possible, and is supported by the tire 34 below the rake 3 at three connecting points. With such a configuration, the rake 3 is made to follow unevenness in the field, rattling during movement is reduced, and safety, strength, and durability are improved. .. Hereinafter, the configuration of the twin rake 1 according to the present embodiment will be described in detail. In each figure, the twin rake 1 is provided symmetrically, and therefore some symbols are attached to only one side.

First, the main frame 21 is connected to the attachment 9 (see FIG. 8) attached to the tractor side, and is composed of a cylindrical metal frame extending in the front-rear direction. Sub-frames 25 extending in the left-right direction are attached to the left and right sides of the rear portion of the main frame 21, and when folded, the sub-frame 25 is rotated downward about a rotation shaft 26 so that the sub-frame 25 can be folded. .. Incidentally, conventionally, a tire is generally provided separately on the rear end side of the main frame 21, but here, the tire is not provided on the rear end side.

As shown in FIG. 2, the rotating shaft 26 of the sub-frame 25 is provided on the lower plate 22 extending obliquely downward from the main frame 21, and the sub-frame 25 is vertically moved around this. It is designed to rotate.

On the other hand, the rake 3 attached to the sub-frame 25 includes a rotor 31 supported by a tire 34, a tine bar 32 radially provided on the outer peripheral portion of the rotor 31, and a tine provided on the tip side of the tine bar 32. 33 and the like are provided, and the tine bar 32 is rotated 360 degrees in the outer peripheral direction while swinging the tine 33 in the vertical direction so that the grass can be collected in a line. The rotation of the tine bar 32 and the swing of the tine 33 are performed by using the driving force of the PTO of the tractor, and as shown in FIG. 1, via the Y-shaped transmission 71 provided below the central portion of the main frame 21. The rotation force is transmitted to the left and right branch drive shafts 72, and the rotation force of the branch drive shaft 72 is used to rotate the tine bar 32 and swing the tine 33. The left and right branch drive shafts 72 branching from the Y-shaped mission 71 can be expanded and contracted in the axial direction, so that even if the positions of the left and right rakes 3 are adjusted, the branch drive shafts follow the branch drive. The shaft 72 is adapted to expand and contract.

Further, the rotor 31 is swingably supported by a single point suspension from the subframe 25. As shown in FIG. 7, the rotor 31 includes a support shaft 35 attached in a direction orthogonal to the sub-frame 25, and is swingable around the support shaft 35. Then, the swing around the support shaft 35 and the rolling along the axial direction of the main frame 21 can follow the unevenness of the field. Further, when the rotor 31 is swung in this way, rattling occurs during movement. Therefore, here, a pin 37 is provided on the plate 36 to which the support shaft 35 is attached, and the pin 37 is made of resin. The cushioning member 38 formed of an elastic member or the like is fitted and brought into contact with the lower surface of the sub-frame 25. By sandwiching the cushioning material 38 in this manner, rattling can be prevented.

The rake 3 to which the tine bar 32 and the tine 33 are attached can be adjusted in left and right positions via a width adjusting mechanism. When the position of the rake 3 is adjusted via this width adjusting mechanism, as shown in FIG. 2, the slide frame 41 is attached to the sub-frame 25 extending in the left-right direction, and the rake 3 is attached to the slide frame 41 at one point by the support shaft 35. Suspend and support. Then, by sliding the slide frame 41 in the axial direction of the sub-frame 25, the positions of the left and right rakes 3 can be adjusted.

When adjusting the position of the rake 3, as shown in FIG. 3, the position of the rake 3 can be adjusted by expanding and contracting a hydraulic cylinder 42 extending obliquely downward from above the main frame 21. More specifically, the tip end side of the piston rod 43 of the hydraulic cylinder 42 is attached to the slide frame 41 of the rake 3, and the rake 3 (slide frame 41) is extended by extending the piston rod 43. Move to the tip side of. Conversely, by contracting the piston rod 43, the rake 3 (slide frame 41) is moved to the base end side which is the main frame 21 side. At this time, it is necessary to regulate the maximum movement width of the rake 3 to prevent the rake 3 from coming off from the sub-frame 25. Therefore, here, a stopper 45 standing upright on the base end side of the sub-frame 25 is provided, and this is provided on the slide frame. By abutting 41, the movement toward the rotating shaft 26 side is restricted. On the other hand, with respect to the outward regulation, the maximum movement width is regulated by using the slide bar 61 provided in the axial direction of the hydraulic cylinder 42. As shown in FIG. 5, one end side of the slide bar 61 is attached to the tip of the piston rod 43 of the hydraulic cylinder 42, and the other end side is provided along the lateral side of the cylinder tube 44. .. A flange portion 62 is provided on the other end side of the slide bar 61, and the flange portion 62 is moved in the channel member 63 provided along the cylinder tube 44. As shown in FIG. 1, a plurality of holes 64 are intermittently provided on the upper surface of the channel member 63, and a stopper pin 65 is inserted into the holes 64 to bring the flange portion 62 into contact with each other. There is. With this structure, when the piston rod 43 is extended, the flange portion 62 of the slide bar 61 moves to the left and right outer sides accordingly, and as shown in FIG. 5B, the hole 64 of the channel member 63 is formed. The flange portion 62 abuts on the stopper pin 65 inserted in the. As a result, the maximum extension width of the hydraulic cylinder 42 is restricted, and the outer maximum movement width of the rake 3 is restricted. In addition, when restricting the outermost movement width of the rake 3, it is possible to provide a stopper or the like standing on the subframe 25 to restrict the outermost movement width, but in this case, the hydraulic cylinder 42 is extended. The large hydraulic pressure is applied to the stopper as it is, which may damage the sub-frame 25, the stopper and the like. Therefore, here, the load on the sub-frame 25 is reduced by restricting the axial extension of the hydraulic cylinder 42. Regarding the stopper 45 on the base end side of the sub-frame 25, even if a large hydraulic pressure is applied when the hydraulic cylinder 42 is contracted, by rotating the sub-frame 25 upward, the load is reduced and the stopper 45 is stopped. The deformation of 45 is prevented.

Further, when the width of the rake 3 is adjusted in this way, the sub-frame 25 is inclined due to the friction between the slide frame 41 and the sub-frame 25 and the force applied obliquely upward from the hydraulic cylinder 42. In addition, if the sub-frame 25 is made rotatable, rattling occurs during movement, and safety, strength, and durability are lost. Therefore, a lower fixing means 5d for fixing the subframe 25 in a horizontal state at the time of collecting grass is provided.

As shown in FIG. 6A and the like, the lower fixing means 5d is rotatable about an abutting portion 55d that straddles a pair of front and rear lower plates 22 and a pin 52 provided on a side surface of the sub-frame 25. The fixing member 51 is attached to the fixing member 51, and the concave portion 53d provided below the fixing member 51 is locked to the abutting portion 55d to fix the sub-frame 25 in a horizontal state. Further, the lower edge portion of the fixing member 51 is provided with a curved portion 54d that abuts the cylindrical abutting portion 55d when the subframe 25 is rotated in a horizontal state. The fixing member 51 is rotated so as to escape by abutting it along the cylindrical outer peripheral portion of the contact portion 55d so that it can be fitted into the contact portion 55d. When the fixing member 51 is locked to the contact portion 55d in this way, the locked state is always maintained by the tensile force of the spring 56 provided between the fixing member 51 and the sub-frame 25. Further, when releasing the locked state, the operator pulls the string 57 provided above the fixing member 51 from the tractor side, so that the concave portion 53d and the contact portion 55d are resisted against the force of the spring 56. Release the locked state of. Although the string 57 is pulled from the tractor side here, the locked state may be released by a solenoid or a motor.

Next, when the sub-frame 25 is erected in a substantially vertical direction, the hydraulic cylinder 42 is contracted so that the sub-frame 25 pivotally supported by the rotary shaft 26 is lifted as shown in FIGS. 4 and 6B. Stand upright. That is, when the hydraulic cylinder 42 is contracted in a state where the fixed member 51 and the contact portion 55d are released from the locked state, the slide frame 41 slides toward the base end side of the sub-frame 25 and contacts the stopper 45 to regulate the slide. (FIG. 6A). Then, by further contracting the hydraulic cylinder 42 from that state, the sub-frame 25 is pulled toward the hydraulic cylinder 42 provided obliquely above, and the sub-frame 25 stands up as shown in FIG.

The subframe 25 thus erected is fixed in the erected state by the upper fixing means 5u (FIG. 6(b)). The upper fixing means 5u is composed of a concave portion 53u provided above the fixing member 51 and a columnar member 55u extending over a pair of front and rear upper plates 24 provided on the upper surface of the main frame 21, and the lower fixing means. Similarly to 5d, the fixed member 51 is rotated by bringing the curved portion 54u provided above the fixed member 51 into contact with the columnar member 55u. Then, by rotating the fixing member 51 in this manner, the concave portion 53u provided above is locked to the columnar member 55u. Also at this time, similarly, the spring 56 provided between the fixing member 51 and the sub-frame 25 maintains the locked state of the recess 53u and the columnar member 55u. On the other hand, when releasing the locked state, the tractor side The locked state is released by pulling the string 57 from.

In such a configuration, the main frame 21 is connected to the attachment 9 attached to the tractor side. When this connection is performed, the main frame 21 is connected so as to be pitched and rollable, and the rear end side of the main frame 21 is connected so as not to swing in the left-right direction during movement.

First, as shown in FIG. 1 and FIG. 8, the attachment 9 is attached so that the top link of the tractor supports the upper frame 91U and the lower link supports the lower frame 91D. The upper frame 91U is provided with the upper connecting portion 9U, and the lower frame 91D is provided with the lower connecting portion 9D to connect the main frame 21.

As shown in FIG. 9, the upper connecting portion 9U is provided with a pin 92 projecting upward from the main frame 21, and the attachment 9 side facing the pin 92 has a triangular shape with a rear side of a long hole-like apex. When the twin rake 1 swings in the front-rear direction during traveling (when pitching), the pin 92 is formed inside the triangular hole 94 in the front-rear direction as shown in FIG. 9A. When the twin rake 1 is rolled, the pin 92 is moved in the left-right direction in the area forming the bottom of the hole 94 to roll the twin rake 1 as shown in FIG. 9B. Is tolerated. Further, when the rolling of the twin rake 1 is restricted, the attachment 9 is lifted and the pin 92 is housed in the elongated hole portion 94a, and the lateral movement of the pin 92 is restricted as shown in FIG. 9C. When the pin 92 is always fixed in the elongated hole portion 94a, the stopper lever 95 provided on the attachment 9 side is tilted to the hole portion 94 side to position the pin 92 in the elongated hole portion 94a. Keep it.

Further, as shown in FIG. 8, the lower side connecting portion 9D accommodates a rotatable spherical body 96 in the lower frame 91D so that the pin 92 of the upper side connecting portion 9U can be freely displaced. To project. Then, the pin 97 is fitted and fixed to the pin receiver 28 of the main frame 21, so that the pin 97 can be freely displaced within a range of a predetermined angle.

Next, the operation of the twin rake 1 configured as described above will be described.

First, when the left and right sub-frames 25 are erected from the upright state (FIG. 6(b)) to the horizontal state (FIG. 6(a)), the cord 57 is pulled from the tractor side to fix the upper fixing means 5u and the fixing member 51. The locked state of the columnar member 55u is released. Then, when hydraulic pressure is applied so as to extend the piston rod 43 of the hydraulic cylinder 42 in this state, the sub-frame 25 rotates in the horizontal direction, and the lower side of the base end side of the sub-frame 25 is placed on the contact portion 55d. Like Further, at this time, the curved portion 54d of the fixing member 51 contacts the curved outer peripheral portion of the contact portion 55d, and the fixing member 51 rotates about the pin 52. Then, the concave portion 53d of the fixing member 51 covers the contact portion 55d, and the locked state is fixed by the pulling force of the spring 56.

Under such a situation, when the hydraulic cylinder 42 is extended, the slide frame 41 slides outward along the sub-frame 25, and the left and right rakes 3 move outward as shown in FIG. 5B. To do. This makes it possible to increase the grass collection width. When the piston rod 43 of the hydraulic cylinder 42 is extended outward in this way, the slide bar 61 attached to the piston rod 43 also moves outward, and the flange portion 62 on the other end side has the hole 64 of the channel member 63. It comes into contact with the stopper pin 65 attached to (the state of FIG. 5B). Then, by bringing the flange portion 62 into contact with the stopper pin 65, the maximum extension width of the hydraulic cylinder 42 is regulated, and the rake 3 is prevented from moving further outward.

On the contrary, when the hydraulic cylinder 42 is contracted, the slide frame 41 slides toward the base end side along the sub-frame 25, and the width of the left and right rakes 3 can be reduced. This makes it possible to reduce the grass collection width. At this time, when the hydraulic cylinder 42 is contracted, the slide frame 41 comes into contact with the stopper 45 (FIG. 5A), and it is possible to prevent the rake 3 from moving further inward.

When the grass collecting width is adjusted in this way to perform grass collecting work in the field, the sub-frame 25 is fixed to the main frame 21 so as not to be tiltable, and it becomes difficult to follow the unevenness of the field. However, in this embodiment, the weight is reduced as a whole so that the tire is not provided behind the main frame 21, and the attachment 9 is lowered so that the pin 92 of the upper coupling portion 9U has a substantially triangular hole portion 94. Since the pin 92 is located at the bottom of the rake 3 (see FIG. 8), the pin 92 is moved forward, backward, leftward and rightward to allow pitching and rolling of the main frame 21 and to prevent the rake 3 from swinging at one point. Thus, the sub-frame 25 can be made to follow the unevenness of the field.

Then, when the grass collecting work is completed while the rake 3 follows the unevenness of the field in this manner, the sub-frame 25 is folded. When the sub-frame 25 is folded in this way, the string 57 is pulled from the tractor side to release the locked state of the fixing member 51 of the lower fixing means 5d and the contact portion 55d, and in that state, the hydraulic cylinder 42 is contracted. ..

Then, the hydraulic cylinder 42 is contracted so that the slide frame 41 comes into contact with the stopper 45 (FIG. 6A), and by further contracting the hydraulic cylinder 42, the sub-frame 25 stands up about the rotary shaft 26. (Fig. 6(b)). At this time, the rake 3 is inclined by its own weight, but the cushioning member 38 can prevent rattling during movement.

Then, with the sub-frame 25 raised to the maximum extent, the upper curved portion 54u of the fixing member 51 is brought into contact with the outer periphery of the columnar member 55u that constitutes the upper fixing means 5u to resist the tensile force of the spring 56. The recess 53u and the columnar member 55u are locked.

As described above, according to the above-described embodiment, the main frame 21 along the traveling direction of the tractor, and the sub-frame 25 that extends in the left-right direction from the main frame 21 and is fixed to the main frame 21 in a tiltable manner at the time of grass collection. , The rakes 3 provided on the left and right subframes 25, and the left and right subframes 25 are rotated upward, and the rakes 3 are slid along the subframes 25 while the subframes 25 are horizontally fixed. With respect to each of the left and right hydraulic cylinders 42 and the attachment 9 attached to the tractor side, the upper connecting portion 9U accommodates the pin 92 projecting upward from the main frame 21 and faces the rear side of the main frame 21. The lower connecting portion 9D is fitted to the pin 27 projecting from the rotatable sphere 96 accommodated on the side of the attachment 9 and the pin 27. In the twin rake 1 including the connecting portion 90 configured by providing the pin receiver 28 on the main frame 21 side, the tire 24 provided below the left and right rakes 3 and the connecting portion 90 in front of the main frame 21. The main frame 21 is supported at three points. As a result, the main frame 21 can be rolled and pitched, and the width of the rake 3 can be adjusted and the sub-frame 25 can be folded by one hydraulic cylinder 42, which can significantly reduce the weight of the rake. 3 can be supported at three points of the connecting portion 90 between the tire 34 and the main frame 21 below the main frame 21. This makes it possible to follow irregularities in the field, reduce rattling during movement, and improve safety, strength, and durability. By eliminating the tires, the whole can be made compact and the turning performance in the field can be improved.

Further, since the cushioning material 38 that suppresses the swing of the rake 3 is provided between the rake 3 and the sub-frame 25, the cushioning material can prevent the rake 3 from rattling, and the strength and durability thereof can be improved. Will be able to have.

The present invention is not limited to the above-mentioned embodiment, but can be carried out in various modes.

For example, in the above-described embodiment, the pin 92 is housed in the hole portion 94 having a substantially triangular shape to allow pitching and rolling. However, the shape is not limited to such a shape, and the pin 92 may be provided within the range of the hole. Such a shape may be adopted as long as the shape is such that the pin 92 is moved back and forth, right and left, and the movement of the pin 92 is restricted during movement on the road.

1 Twin Rake 21 Main Frame 25 Sub Frame 3 Rake 31 Rotor 34 Tire 35 Support Shaft 38 Buffer Material 42 Hydraulic Cylinder 9 Attachment 90 Connection 9D Lower Connection 9U Upper Connection 92 Pin 94 Hole 94 Sphere 97 Pin

Claims (2)

A main frame along the tractor's running direction,
A subframe that extends from the main frame in the left-right direction and is fixed to the main frame so that it cannot be tilted when collecting grass,
Rake provided on the left and right subframes,
While rotating the left and right sub-frames upward, each left and right hydraulic cylinders that slide the rake along the sub-frame while the sub-frame is fixed horizontally,
For the attachment attached to the tractor side, the upper connecting part is configured to accommodate a pin protruding upward from the main frame and to provide a hole portion that narrows the inner width toward the rear side of the main frame. A connecting portion configured to include a pin protruding from a rotatable sphere housed on the attachment side, and a main frame side pin receiver fitted to the pin, the lower connecting portion,
In a twin rake equipped with
A twin rake in which a main frame is supported by three points of a tire provided below the left and right rakes and a connecting portion in front of the main frame. The twin rake according to claim 1, further comprising a cushioning material provided between the rake and the sub-frame for suppressing rocking of the rake.

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