JPH051208Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a structure for adjusting the position of the tilling cover and rear cover of a rotary tilling device that is attached to the rear of an agricultural tractor and performs rough tilling, puddling, etc. .

(b) Prior art In conventional rotary tillage devices, for example, as in the technology described in Japanese Patent Publication No. 53-27165, a top link hinge is protruded from the rear of an agricultural tractor, and a top link and a top link are pivotally connected to the top link hinge. A technique in which a rotary tiller is supported by two lower links so that it can be raised and lowered, and a technique in which a tiller cover can be rotated back and forth as the rotary tiller goes up and down are known.

However, in this conventional technology, the top link part and the rotatable tilling cover are connected, and when the rotary tilling device is raised, the tilling cover and rear cover automatically move backward. The technology does not include a technique for rotating the tilling cover and rear cover back and forth during tilling work, and therefore, the adjustment requires adjusting a turnbuckle provided on the top link. Therefore, the operator had to get off the vehicle each time to make adjustments.

In addition, as another known technique, as in the technique described in Japanese Utility Model Publication No. 52-29130, the tilling cover is configured to be rotatable back and forth with respect to the position of the tilling claw, and the rotation of the tilling cover is controlled by a depth frame. The technique of rotating and changing the position in conjunction with the vertical movement of is known.

However, in this technology, the rotation of the tilling cover is not caused by the tilling claw shaft, but by being suspended from the bevel gear box of the rotary tilling device. Since the circumference of the rotation locus was not changed accurately, there was a problem in that the purpose of changing the position of the tilling cover, which was to suppress the splashing of soil from the tilling claws in an optimal state, could not be sufficiently achieved.

In addition, in the case of the above two known examples, in both cases, there is a technology in which the pivot point between the tilling cover and the rear cover can be freely rotated, and the ground contact angle between the rear cover and the ground surface can be changed. It has not been disclosed.

(c) Problems to be solved by the invention The purpose of the invention is to solve the problem that the rotary tilling equipment can be used even when the rotary tilling equipment is placed at a high position relative to the tractor, such as during puddling work. Even when working at a low position lowered relative to the tractor, the rear cover can be adjusted so that the work can always be done in the optimum condition for the plowing condition.

In particular, the tilled soil retention gap constructed between the rear cover, tilling claws and the ground surface is optimized, the grounding condition of the rear cover is optimized, and the gap between the rear cover and the tilling claws is adjustable to the appropriate level. It is.

Further, the tilling cover and the rear cover can be rotated back and forth by an operator sitting on the seat of the agricultural tractor.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

In a configuration in which a top link hinge 13 protrudes from the rear of the agricultural tractor, and a rotary tiller is supported in a vertically movable manner by a top link 14 pivotally connected to the top link hinge 13 and two lower links, the tiller claw shaft of the rotary tiller is supported. 32, the tilling cover 1 is configured to be rotatable in the front-rear direction, and the rear cover 5 is pivotally supported at the rear end of the tilling cover 1 so as to be rotatable in the up-down direction. The pivot point 9 is also the tilling claw shaft 32.
The rotation operating device 3a moves the depth frame 2 up and down, as well as the pivot point 9 of the tilling cover 1 and the rear cover 5, according to the high and low positions of the tilling device relative to the tractor. At the same time, rotate the rear cover 5 in the front and back direction.
By arbitrarily adjusting the grounding state of the rear cover 5, the grounding angle of the rear cover 5 with respect to the ground surface and the gap between the rear cover 5, the tilling claws 6, and the ground surface can be arbitrarily adjusted. It can be operated from the seat side.

(e) Embodiment The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is a side view of the rotary tiller of the present invention, and FIG. 2 is a plan view thereof.

The rotary tiller is attached to the rear of an agricultural tractor, and is attached to a three-point link type work implement attachment device.

A top link hinge 13 protrudes from the rear of the rear axle case of the agricultural tractor, and a short top link 14 having approximately the same length is provided on the top link hinge 13, and the top link 14 is a top link mast of a rotary tiller. It is pivotally connected to 12.

Furthermore, two lower links protrude from the rear axle case of the agricultural tractor, and the tips of the lower links are attached to the lower link pivot pins 19L, 19.
It is pivotally connected to R. And top link 14
It is attached by two lower links and is moved up and down by the lift arm of the agricultural tractor.

A cover adjustment device 3 for adjusting the height of the depth frame 2 is interposed between a part of the top link mast 12 and the depth frame 2, and the depth frame 2 can be adjusted by rotating the rotation operation device 3a. Through the tillage cover 1, rear cover 5 and side plate 1
1 and 11 are adjusted integrally.

The pivot pin 2a of the depth frame 2 is attached so as to serve also as a mounting plate 17 to which the lower lift pivot pin 19 is attached. The mounting plate 17 has a main beam 16 projecting from the bevel gear box 10 on both sides.
Fixedly installed at L and 16R, respectively. A chain case 18 is fixed to the outer end of the main beam 16L, and a side frame 33 is fixed to the outer end of the main beam 16R.

The tilling cover 1, the left plate 1a, the right plate 1b, and the rear cover 5 are rotatably supported around the tilling claw shaft 32.

With the rear cover 5 being pivotally supported at the pivot point 9 at the rear end of the tilling cover 1, these covers are rotated and positioned by the connecting rod 8 and the rear cover hanging rod 7. 11 is a side plate, which is adjustable and pivotally connected to the rear part of the tillage cover 1;
15a is a tail wheel vertical rod, 15a is a tail wheel horizontal rod, and 4 is a tail wheel.

In addition, side plates 11, 1 are provided on both rear sides of the tillage cover 1.
1 is attached so that the pivot point 9 of the tilling cover 1 and the rear cover 5 and the side plates 11, 11 can be rotated simultaneously in the front and rear directions.

Further, as shown in FIG. 1, a cover adjustment device is provided between the rear part of the tilling cover 1 and the upper part of the machine frame constituted by the top link mast 12, etc., and the cover adjustment device is used as a rotation operation device 3a. A motion operating device 3a is provided protruding from the top of the machine frame toward the tractor seat side.

With this configuration, the positions of the tilling cover 1 and rear cover 5 can be adjusted while sitting on the tractor seat.

FIG. 3 is a drawing showing the power transmission structure of the rotary tiller.

Power is transmitted from the PTO shaft 22 of the agricultural tractor to the input shaft 23 of the bevel gearbox 10 through a universal joint, and the bevel gearbox 1
Power transmission shaft 2 via bevel gears 26 and 27 in 0
Power is transmitted within the main beam 16L at 8.

A sprocket 29 is fixed to the end of the power transmission shaft 28, and power is transmitted to the sprocket 30 by a chain inside the chain case 18. The sprocket 30 is fixed to the tilling shaft 31, and connects a bracket 31a at the end of the tilling shaft 31 to a bracket 32a of the tilling claw shaft 32, thereby rotating the tilling claw shaft 32 and the tilling claw 6.

A wear prevention cover 34 is fixedly provided to cover the lower surface of the chain case 18, and a wrapping prevention plate 36 is provided on the tilling claw shaft 32 side and fixedly fixed to the bracket 31a. The wrapping prevention plate 36 rotates together with the tilling shaft 31, and a wrapping prevention plate 35a on the chain case 18 side is provided to protrude from the outer periphery of the plate 36 to prevent straw from entering.

Wrapping prevention plate 35a on this chain case 18 side
is fixed to the chain case 18, and the tilling cover attachment body 45 is loosely fitted to the outer circumferential plate 35b of the winding prevention plate 35a, and the left plate 1a of the tilling cover 1 is fixed. That is, the left plate 1a is the outer peripheral plate 3 of the wrapping prevention plate 35a.
The portion 5b is used as a bearing.

As described above, the left plate 1a of the tilling cover 1 and the tilling cover mounting body 45 are constructed separately. With this configuration, the tilling cover attachment body 45 is fitted onto the outer circumferential plate 35b in advance, then the outer circumferential plate 35b and the wrapping prevention plate 35a are attached to the chain case 18, and finally the left plate is attached to the tillage cover attachment body 45. Since the portion 1a can be fixed, the bearing portion of the tillage cover 1 can be easily assembled.

In addition, since the outer circumferential plate 35b and the wrapping prevention plate 35a are configured separately from the chain case 18, even if wear occurs between the tilling cover mounting body 45 and the outer circumferential plate 35b, the chain case 18
Repairs can be made by replacing only the wrapping prevention plate 35a without having to replace the wrapping prevention plate 35a.

A side frame 33 is fixed to the tip of the right main beam 16R, and a bearing case 39 is fixed to the tip of the side frame 33.

Figure 4 shows the tilling cover 1 and the rear cover when the rotary tilling device is moved up and down by the lift arm of the tractor and the depth frame 2 is corrected to a horizontal state by the depth frame rotation operating device 3a each time. 5 is a drawing showing the state of No. 5.

In the case of a conventional rotary tilling device in which the tilling cover does not rotate, tilling cover 1, rear cover 5
is tilted in the same manner as the rotational posture of the chain case 18.

In contrast, in the present invention, the tilling cover rotates in conjunction with the movement of the depth frame 2, so the depth frame 2 is rotated by the depth frame rotation operating device 3.
By adjusting with a and keeping it in a horizontal position,
The relationship between the height of the tilling claw shaft 32 on which the tilling claws 6 are planted and the heights of the rear cover 5 and the tilling cover 1 remains almost unchanged, and the upper surface of the tilling claw rotation trajectory is always covered with the tilling cover 1 and the rear surface is covered with the rear cover. You can adjust the position to hide it.

As a result, the top link mast 12 becomes 12'
The position of the input shaft 23 changes from 23' to 12''.
23'', the depth frame 2 can be adjusted in parallel to 2', 2'', the tilling cover 1 can be adjusted to 1', 1'', and the rear cover 5 can be adjusted to 5', 5''. be.

The connecting rod 8 may be of any type as long as it can stop the tilling cover 1 from rotating beyond a certain level with respect to the depth frame 2. 8a and 21a are pivot pins.

In FIG. 4, power is transmitted from a PTO shaft 22 of an agricultural tractor to an input shaft 23 of a bevel gearbox 10 through a universal joint.

(f) Function of the invention Next, the drawings showing the function of the invention shown in Figures 5 and 6 will be explained.

Figure 5 shows the position of the rotary tiller during puddling work, which is a typical shallow plowing operation.The rotary tiller is raised to the puddling position, and the positions of the tilling cover 1 and rear cover 5 are adjusted. FIG. 3 is a side view showing the state before adjustment and the state after adjustment to the optimal state.

In plowing work, paddy fields are filled with water and the ground surface, from the surface of the paddy field B to the slightly lower planting surface C, is plowed, and the rear wheel T of the tractor is in the paddy field. It has sunk down to tiller A.

Therefore, the rotary tiller is in a position where the tiller claws 6 are rotated while maintaining the high state.

Therefore, the rotary tiller is in a position where the tiller claws 6 are rotated while maintaining the high state.

Therefore, as shown by the two-dot chain line in FIG. 5, if the tilling cover 1 and the tilling claws 6 are not adjusted, the position of the pivot point 9 at the rear end of the tilling cover 1 is too forward, so that the rear cover hanging rod 7 In the suspended state, the rear cover 5 is at a high position as 5', and when the rear cover hanging rod 7 is adjusted to hang the rear cover 5, it becomes so high that it interferes with the rotation locus of the tiller claws 6 as 5''. be.

In order to solve this problem, the rear cover 5 is divided into two parts, the front and the rear, and by making it possible to expand and contract between the two, the rear cover 5 is grounded on the paddy field B, and the tilling claws 6 are Although it is possible to prevent the rear cover 5 from interfering with the rotation locus, making the rear cover 5 extendable and retractable in this way increases the cost.

The present invention solves such problems. That is, by rotating the rotation operating device 3a, the tilling cover 1 is rotated rearward as shown by the solid line in FIG. 5, and the pivot point 9 is simultaneously moved from the front position 9 to the rear position 9'. By doing this, it is possible to obtain a state in which the rear cover 5 is in contact with the paddy field surface B in a hanging state.

Thereby, an optimal gap for holding tilled soil can be formed between the tip of the tilling claw 6 and the rear cover 5.

Figure 6 shows the state in which the rotary tiller is lowered for rough tilling work, which is a typical case of deep plowing. FIG. 4 is a side view showing a state before the positions of the cover 1 and the rear cover 5 are adjusted, and a state after the positions are adjusted to the optimum state.

In the case of rough plowing, since the work is done in dry fields without water, the tractor's rear wheel T
is not supported on the tiller A, but on the soil surface E.

When the soil surface E is tilled, the tilled soil becomes swollen and soft, so that a tilled soil surface D, which is a higher ground surface than the soil surface E, is formed.

In this way, the rear wheels T of the tractor are on the soil surface E, and the tilling claws 6 have been lowered to the deep plowing position for rough tilling, while the rear cover 5 is placed on the ground surface E. The tilled soil surface D is the soil surface E
Therefore, if the rotation operating device 3a is not used to adjust the rear cover hanging rod 7 for suspending the rear cover 5, the rear cover 5 will sink to the 5'' position. ,
When the rear cover hanging rod 7 is adjusted so that the rear cover 5 is in contact with the tilled soil surface D, the position 5' in Fig. 6 is reached.
The rear cover 5 maintains a substantially horizontal position as in the position shown in FIG.

In this state, since the length of the rear cover 5 in contact with the tilled soil surface D is too long, the evenness of the tilled soil also deteriorates.

Even in such a case, if the tilling cover 1 and rear cover 5 are rotated forward by rotating the rotation operating device 3a as shown by the solid line in FIG. 6, the pivot point 9 will be at the position 9'. to position 9, the front opening of the tilling cover 1 is reduced, the tilling soil holding gap between the rear cover 5 and the tilling claws 6 is made appropriate, and the contact length of the rear cover 5 to the tilling soil surface D is adjusted. It is possible to make it suitable.

In addition, side plates 11, 1 are provided on both rear sides of the tillage cover 1.
1, and the pivot point 9 of the tilling cover 1 and rear cover 5 and the side plates 11, 11 can be rotated simultaneously in the front and rear directions, thereby achieving the following effects.

That is, at the time of purging shown in FIG. 5, if the position of the pivot point 9 is not adjusted rearward by the rotation operating device 3a, the side plates 11, 11 will also rise, so that the side plates 11, 11 are not closed. The side surface of the tilling cover 1 becomes open, and the tilled soil scatters from this part.

On the other hand, by setting the positions of the pivot points 9 of the tilling cover 1 and rear cover 5 to appropriate positions using the rotation operation device 3a, the side plates 11, 11 also prevent the tilled soil from scattering from the sides of the tilling cover 1. This allows the optimum position to be used.

Further, in the case of rough tilling shown in FIG. 6, if the position of the pivot point 9 is not adjusted by the rotation operating device 3a, the side plates 11, 11 also protrude in the direction of digging into the lower part of the tilled soil surface D. Sisters,
This acts as a resistance and causes problems such as an increase in the required horsepower and traces of the side plates 11, 11 being left on the tilled soil surface D after tilling.

On the other hand, by adjusting the position of the pivot point 9 of the tilling cover 1 and rear cover 5 using the rotation operation device 3a, the side plates 11, 11 are also arranged upward, so that the lower end of the side plate 11 is placed on the tilled soil surface D. It can be positioned so that it does not cut into the inside of the body.

(g) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, depending on the difference in work formats such as shallow plowing and deep plowing, and the hardness and softness of the soil conditions, the grounding condition of the rear cover 5 with respect to the ground surface and the gap formed by the trail of the tip of the tilling claw and the rear cover 5 and the ground surface are adjusted. , it became possible to adjust it to any optimal state. This makes it possible to obtain the optimum state of the rear cover 5 in both shallow and deep plowing.

That is, there are two points from which to check the grounding state of the rear cover 5.

One is the gap formed by the tip of the tilling claw, the ground surface, and the rear cover 5, and the other is the grounding angle of the rear cover 5 with respect to the soil surface.

In the present invention, first, in the ground contact state, by arbitrarily adjusting the amount of the gap formed between the rear cover 5, the tilling claws 6, and the ground surface using the rotary operation device, the amount of soil carried around and the amount of soil discharged to the rear can be adjusted. can be adjusted, so that the optimum soil crushing effect by the tilling claws 6 can be obtained within the rear cover 5.

In addition, by similarly adjusting the gap between the rear cover 5, the tilling claws 6, and the ground surface to an arbitrary optimal state, the required horsepower of the rotary tilling device can be adjusted to the minimum state, and engine stalling can be prevented. This is possible.

Furthermore, since the ground contact angle between the rear cover 5 and the ground surface can be set to an arbitrary optimum angle, the leveling effect of the rear cover 5 can be improved and the best finished soil surface can be obtained.

Second, by operating the rotation operating device 3a, the operator can change the gap formed between the rear cover 5, the tilling claws 6, and the ground surface, and the ground contact angle of the rear cover 5 without interrupting the tilling operation. This eliminates the need to get off the vehicle and adjust the turnbuckle of the top link each time, as was the case in the past.

Thirdly, since not only the pivot point of the rear cover 5 but also the tilling cover 1 rotates back and forth at the same time, there is a problem that the tilling cover hangs down at the rear of the rotary tilling device and gets in the way during deep tilling. It does not occur.

Fourthly, in the case of a configuration in which the vertical movement width of the rotary tilling device is increased through a special top link mechanism constituted by a short top link, since the degree of tilting of the rotary tilling device is large, the tilling cover 1 and the tilling If the claws 6 cannot be rotated back and forth, problems such as the gap between the rear cover 5 and the tilling claws 6 becoming too wide or too narrow tend to occur.

On the other hand, these problems can be solved by using the technology of the present invention of the tilling cover 1 and the rear cover 5 which are rotatable around the tilling shaft.

[Brief explanation of the drawing]

Figure 1 is a side view of the rotary tiller of the present invention, Figure 2 is a plan view, Figure 3 is a drawing showing the power transmission structure of the rotary tiller of the present invention, and Figure 4 is a diagram showing how the lift arm of an agricultural tractor can be used. , a drawing showing the state of the tilling cover 1 and the rear cover 5 when the rotary tilling device is moved up and down and the depth frame 2 is corrected to the horizontal state by the rotation operating device 3a each time. Raise the rotary tiller to the working position and remove the tiller cover 1.
FIG. 6 is a side view showing the state before adjusting the position of the rear cover 5 and the state after adjusting the position to the optimum state. FIG. FIG. 3 is a side view showing a state before the position is adjusted and a state after the position is adjusted to the optimum state. 1... Cultivation cover, 2... Depth frame, 3
... Cover adjustment device, 3a ... Rotation operation device, 5
...Rear cover, 6...Tilling claw, 8...Connecting rod,
8a... Pivot pin, 9... Pivoting point of tilling cover and rear cover, 11... Side plate, 13... Top link hinge, 14... Top link, 32... Tilling claw shaft.

Claims (1)

[Scope of utility model registration request] In a structure in which a top link hinge 13 protrudes from the rear of the agricultural tractor, and a top link 14 pivotally connected to the top link hinge 13 and two lower links support a rotary tilling device so as to be able to rise and fall, the tilling claws of the rotary tilling device axis 32
The tilling cover 1 is configured to be rotatable in the front-rear direction, and the rear cover 5 is pivotally supported at the rear end of the tilling cover 1 so as to be rotatable in the up-down direction. The pivot point 9 is also the tilling claw axis 3
The rotation operating device 3a moves the depth frame 2 up and down, and the pivot points of the tilling cover 1 and rear cover 5 are 9 at the same time in the front-back direction and arbitrarily adjust the grounding state of the rear cover 5, the grounding angle of the rear cover 5 with respect to the ground surface and the distance between the rear cover 5, the tilling claws 6, and the ground surface can be arbitrarily adjusted. A rotary tilling device for an agricultural tractor, characterized in that the rotation operating device 3a can be operated from the seat side of the agricultural tractor.