JPH0974836A - Link structure for lifting and lowering of rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a link structure for lifting and lowering of a rice transplanter excellent in installation accuracy of parts by installing top link connecting parts, etc., in different sites in the longitudinal direction in a main frame part and composing a vertical link in a strong form. SOLUTION: This link structure for lifting and lowering of a rice transplanter is obtained by casting and molding a vertical link 42, installing a main frame part 43 of a constant small width in the longitudinal direction of the vertical link 42 therein, arranging top link connecting parts 43A, lower link connecting parts 43B and a rolling supporting part 46 in regular order in different sites in the longitudinal direction in the main frame part 43, standing a main rib extending from the rolling supporting part 46 to a position on this side of the top link connecting parts 43A, providing the top link connecting parts 43A and the lower link connecting parts 43B in states thereof protruded from both lateral faces of the main frame part 43 and arranging the first side frame 47A for connecting the first top link protruding part (43a) extended from either of the lateral faces to the first lower link protruding part (43b) and the second side frame part 47B for connecting the second top link protruding part (43c) extended from the other lateral face to the second lower link protruding part (43d).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to attach a seedling planting device to a rear end of a traveling machine body through an elevating link mechanism, and to the elevating link mechanism, a top link connecting part, a lower link connecting part, and The lifting link structure of a rice transplanter is provided with a vertical link having a rolling bearing for supporting a seedling planting device in a freely rolling manner.

[0002]

2. Description of the Related Art Conventionally, a vertical link has a welded structure.

[0003]

As the vertical link, since it is necessary to form attachment parts for various members such as a top link connecting part, a lower link connecting part, and a rolling bearing part, the vertical link is further attached to the vertical link itself. It was necessary to improve the strength, and there were some aspects that the welded structure could not handle.

An object of the present invention is to stabilize the supporting condition of the seedling planting device while improving the strength of the vertical link.

[0005]

According to a first aspect of the present invention, the vertical link is formed by casting, and the vertical link is provided with a main frame portion having a constant short width along the longitudinal direction of the vertical link. Provided on this main frame portion, at different positions along the longitudinal direction, a top link connecting portion, a lower link connecting portion, and a rolling bearing portion are arranged in order, and the top link connecting portion from the rolling bearing portion is arranged. A main rib extending to a front position is erected, and the top link connecting portion and the lower link connecting portion are provided so as to project from both lateral side surfaces of the main frame portion, and are extended from the one lateral side surface. 1st top link protrusion and 1st
A first side frame part that connects the lower link projecting part and a second side frame part that connects the second top link projecting part and the second lower link projecting part extended from the other side surface are provided. There is a certain point, and the action and effect are as follows.

[Operation] That is, the vertical link is cast-molded. Therefore, the top link connecting portion, the lower link connecting portion, and the rolling bearing portion can be integrally formed with the main frame portion, and the connection between the main frame portion and each connecting portion can be strengthened. Since the main rib is provided on the constant short width surface of the main frame portion, the main rib increases the section modulus,
It is strengthening. However, since the main rib is provided only up to the position before reaching the top link connecting portion, it is possible to prevent the load transmitted through the top link connecting portion from being concentrated on the main rib. Since the first and second top link protrusions and the first and second lower link protrusions are connected by the first and second side frame portions, the load transmitted to the top link connecting portion and the lower link connecting portion. Are distributed to both side frame parts to prevent the load from being concentrated on the main frame part.

[Advantages of the Invention] Therefore, basically by casting and forming the main ribs, the strength of the vertical link itself is improved, and by distributing the load, a vertical link with high bending and torsional rigidity is obtained. We have reached the point where we can offer.

[0008]

According to a second aspect of the present invention, there are provided two lateral side surfaces located between the rolling bearing portion and the lower link connecting portion in the main frame portion, and both lateral side surfaces. A rolling restriction mechanism for the seedling planting device is configured with a regulating portion that belongs to the seedling planting device, and an auxiliary rib that connects the lateral side surface and the main rib is erected, and this auxiliary rib is stretched. The direction is set to an inclined direction that is not biased to either the longitudinal direction or the short width direction, and the operation and effect thereof are as follows.

[Operation] That is, at the rolling limit of contact with the regulating portion of the seedling planting device, the main frame portion corresponding to both lateral side surfaces that receive a reaction force from the regulating portion has the longitudinal direction or the short width direction. Auxiliary ribs are provided so as not to be biased in any direction, and the reaction force is dispersed through the auxiliary ribs to avoid stress concentration on the lateral side surface.

[Effects of the Invention] Therefore, it is possible to improve the strength of the main frame even with an applied load when the rolling limit is reached.

[0011]

According to a third aspect of the present invention, a flat surface having a constant short width along the longitudinal direction is formed on the main frame portion from the top link connecting portion to the rolling bearing portion. And a second flat surface portion located between the lower link connection portion and the rolling support portion and a first flat surface portion located between the top link connection portion and the lower link connection portion. It is located at different positions in the thickness direction orthogonal to the plane, and the function and effect are as follows.

[Operation] That is, since the flat surface having a constant short width is provided, the opposing force against the twisting force around the axis perpendicular to the flat surface can be increased, and the flat surface can be simply flushed. It is not provided, but the first plane portion and the second plane portion
Since the flat part is formed at a different position, that is, in a state in which a so-called step is provided, the section modulus is increased even for bending load around the axis along the flat surface to improve the strength of the main frame part. I am trying.

[Effects of the Invention] Therefore, the torsional bending rigidity of the main frame portion can be increased, and the seedling planting device can be supported in a stable posture.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a steering type driving front wheel 1 and a driving rear wheel 2 are provided.
An engine 4 is mounted on the front part of a traveling machine body 3 including a vehicle, and a hydrostatic continuously variable transmission (HST) 5 for transmitting power from the engine 4 to the rear part of the traveling machine body 3 and a transmission case 6. The driving seat 7 is arranged in the central portion of the traveling machine body 3, and the seedling planting device A is connected to the rear end portion of the traveling machine body 3 via an elevating link mechanism C that is driven by a hydraulic cylinder 8 to move up and down. To construct a riding type rice transplanter. On the right side of the driver's seat 7, there is provided an elevator lever 10 for controlling the raising and lowering of the seedling planting device A and on / off operation of the planting clutch, and on the left side of the driver's seat 7, there is provided a speed change lever 11.

The seedling planting device A has a mat-shaped seedling W placed thereon, and an upper end side of which is inclined to the front side of the traveling body 3, and a transmission case 12 via a transmission shaft 12 from a transmission case 6. A pair of left and right transmission cases 14, 14 to which power is transmitted,
A rotary case 16 that rotates by the power transmitted from the transmission case 14 via the chain case 15, a pair of planting arms 17 provided in the rotary case 16 one by one,
It is equipped with a plurality of leveled floats 18 for eight-row planting, and is equipped with a fertilizer application device 19 having a hopper, a feeding mechanism, a grooving device, etc. From the bottom edge of the seedling W, the seedling planting arm 17 is 1
At the same time as cutting out each plant and planting it in a field scene, the fertilizer application device 19 supplies fertilizer to the field scene near the planted seedling.
A seedling planting mechanism is constituted by the rotary case 16, the planting arm 17, and a system for driving these.

As shown in FIG. 2 and FIG. 3, in this rice transplanter, two rows of four rows are provided at the center position of the seedling planting device A in the left-right direction.
It is configured to be split freely, and each split seedling planting device section A
The first axis X1 of L and AR in a vertical posture with respect to the frame member 20 that constitutes the divided seedling planting device sections AL and AR.
The frame member 20 is rotatably supported around the main frame 21 provided at the rear end of the link mechanism C, and the frame member 20 is rotatably supported around the second axis X2 in the vertical posture. There is.

As shown in FIGS. 2, 3 and 10, the link mechanism C is composed of a top link 44 arranged at the upper part and a lower link 45 arranged at the lower part, and a vertical link for supporting the rear end of each link. A rolling boss 46 serving as a rolling bearing formed at the lower end of 42 supports the connecting plate 23 so as to be freely rollable around the rolling axis Y in the front-back direction, and the upper plate 21A and the lower portion of the connecting plate 23 are supported. A boss member for fixedly mounting the main frame 21 composed of a pipe 21B and rotatably fitted to a second shaft 24 arranged coaxially with the second shaft core X2 at both left and right ends of the main frame 21. 20A, the round pipe-shaped frame member 20 is fixed to the frame member 20.
Is rotatably supported about the second axis X2, and is channel-shaped with respect to the first axis 25 arranged coaxially with the first axis X1 at the outer end portions of the frame members 20, 20. A square pipe-shaped support frame 27 is rotatably supported around the first axis X1 via the bracket 26, and the left and right transmission cases 14 and the chain case 15 are supported with respect to the support frame 27. Fixed and further provided with left and right sliding rails 28, 28 for supporting the seedling placing table 13 on the upper surfaces of the pair of chain cases 15, 15 of the divided seedling planting device portions AL, AR, respectively.

As shown in FIG. 2, the left transmission case 14
The helical shaft 29 driven to rotate by the power of
4 and a bearing member 30 at the end of the support frame 27 on this side.
And a moving member 31 for transmitting the moving force of a top (not shown) engaging in the spiral groove of the spiral shaft 29 to the left divided seedling mounting base 13L. Stand 1
3 is constituted. The right and left divided seedling mounting portions 13L and 13R are connected to each other by connecting members, so that the power from the lateral feeding mechanism B moves the seedling mounting base 13 integrally on the sliding rails 28 and 28 in the horizontal direction. Reciprocate to.

A shaft (not shown) to which the power from the power transmission shaft 12 is transmitted is supported in an idle manner in parallel with the rolling shaft core Y. As shown in FIG. 2, the power of the shaft is beveled. A transmission system is formed to transmit to the left and right transmission cases 14 and 14 via the case 32, a pair of output shafts provided in the bevel case 32, the clutch mechanism 34, and the intermediate shaft 35, respectively.

As shown in FIG. 4, the second shaft 24 is provided non-rotatably with respect to the main frame 21, and the first shaft 25 is provided non-rotatably with respect to the frame member 20. The main sprocket 36 is fixedly installed coaxially with the second shaft core X2 at an upper position of the second shaft 24, and the second shaft core X2 is provided at an upper end position of the second shaft 24.
A plate-like rotating member 37 is provided so as to be freely rotatable around it. Further, the bracket 26 is rotatably supported with respect to the first shaft 25, and is rotated integrally with the bracket 26, and a driven sprocket 38 having half the number of teeth of the main sprocket 36 is provided. The chain 39 is arranged coaxially with the first axis X1, and a chain 39 is wound around the main sprocket 36 and the driven sprocket 38.

The left and right rotating members 37, 37 are arranged at a higher level than the left and right frame members 20, 20, and
The frame members 20 and 20 are connected and fixed via the rods 40 and 40 in a suspended posture so as to rotate in association with the rotational force of the frame members 20, and the left and right rotating members 37 and 37 are rotated in opposite directions. , A pair of wires 4 in a crossed position between each
1, 41 are stretched.

With such a configuration, when the seedling planting device A is stored, one of the seedling planting device parts A is artificially moved while the seedling planting device A is raised to a level spaced from the ground.
When L and AR are rotated, one support frame 27 and the frame member 20 are rotated, and the other support frame 27 and the frame member 20 connected by the wires 41 and 41 are rotated, and as shown in FIG. The storage posture is as shown. To return to the work posture, the operation in the opposite direction may be performed.

Next, the vertical link 42 of the lifting link mechanism C will be described. The main frame portion 43 having a constant horizontal width in a vertical posture is provided, and the main frame portion 43 is provided.
Top link connecting portion 43 from the upper side of the
A, a lower link connecting portion 43B, and a rolling boss as a rolling bearing portion 46 are provided at the lower end. The top link connecting portion 43A and the lower link connecting portion 43B are projected from both lateral sides of the main frame portion 43, and the left protruding portions are the first top link protruding portion 43a and the first lower link protruding portion 43b, and the right side. The portion protruding to the second top link protrusion 43c and the second lower link protrusion 43d
And The first top frame projecting portion 43a and the first lower link projecting portion 43b are arranged vertically to form the first side frame portion 4
7A, the second top link projecting portion 43c and the second lower link projecting portion 43d are connected to the second side frame portion 4 in the vertical direction.
It is connected by 7B.

The main frame portion 43, as shown in FIG.
A flat surface 48 having a constant width is provided in the area from the top link connecting portion 43A to the rolling bearing portion 46, and a flat surface 48 is provided on the rear surface between the top link connecting portion 43A and the lower link connecting portion 43B. As the first flat surface portion 48A and the lower link connecting portion 4
Between 3B and the rolling bearing 46, a flat surface 48 is provided at a front-rear intermediate position to form a second flat surface portion 48B. The first flat surface portion 48A and the second flat surface portion 48B are connected by the third flat surface 48C in the front-back orientation to form a step portion.

As shown in FIGS. 6 and 7, the above-mentioned plane 48 is provided with a reinforcing rib in a front-back direction.
At the center position of the main frame portion 43 on the left and right, the main rib 4 is provided in a range from the top link connecting portion 43A to the rolling bearing portion 46.
9 are provided. The left and right ribs 50 are provided at the left and right ends of the main frame portion 43 in parallel with the main ribs 49.
The side surface 3 is formed, and the main rib 49 is stopped below the top link connecting portion 43A. The main rib 49 and the left and right ribs 50 form the top link connecting portion 43.
The portion A extends from the lower link connecting portion 43B toward the front, but the portion extending from the lower link connecting portion 43B to the rolling support portion 46 extends toward the front and rear. Between the main rib 49 and the left and right ribs 50, the connecting ribs 51 that are oriented in the left and right direction in a state of connecting both ribs 49, 50.
A plurality of are provided. However, among the connecting ribs 51, the rib between the lower link connecting portion 43B and the rolling bearing portion 46 is provided as an auxiliary rib 51A in an oblique posture in which it is divided into two parts vertically, not in a complete left-right direction.
Both side surfaces c of the main frame portion 43 provided with the auxiliary rib 51A,
On the lateral outer side of d, there is provided a rolling regulation portion 21a formed in the main frame 21 and having a channel-shaped cross section. Therefore, a mechanism D for controlling the rolling of the seedling planting device A is provided. Each of the first side frame portions 47A and 47B has an angle-shaped cross section, and has a hole 47a on the rear surface for reducing the weight. As described above, the main frame portion 43 and the top link protruding portion 4
3a and 43c, lower link protrusions 43b and 43d, and rolling support 46 are integrally cast.

A mounting seat 52 of a rolling drive mechanism E for rolling-driving the seedling planting apparatus A is provided in a portion of the plane 48 of the main frame portion 43 corresponding to the top link connecting portion 43A. As shown in FIG. 11, a moving body 54 that engages with the spiral shaft 53 and reciprocates in the axial direction of the spiral shaft 53, and an electric motor 55 that drives the spiral shaft 53 are provided and attached to the mounting seat 52. The lateral movement of the moving body 54 causes the seedling planting device A to perform a rolling operation so as to balance the biasing force of the tension spring 56 that is stretched across the moving body 54 and the axial center X2 position. Reference numeral 57 in the figure denotes a balance spring of the seedling planting apparatus A.

[Other Embodiments] In addition to the above embodiments, the present invention is
You may apply to the rice transplanter other than the division type which divides the seedling planting apparatus A.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of drawings]

[Figure 1] Overall side view of rice transplanter

FIG. 2 is a plan view of a transmission system of the seedling plant.

FIG. 3 is a plan view of a transmission system of the seedling planting device in a stowed position;

FIG. 4 is a rear view of the main frame and a frame member with a partially cutaway.

[Figure 5] Rear view of vertical link

[Figure 6] Front view of vertical link

FIG. 7: Side view of vertical link

8 is a sectional view taken along line AA in FIG.

9 is a cross-sectional view taken along line CC of FIG.

FIG. 10 is a perspective view of a vertical link.

FIG. 11 is a rear view showing the rolling mechanism and the vertical link.

[Explanation of symbols]

 3 Traveling vehicle 42 Vertical link 43 Main frame part 43A Top link connecting part 43B Lower link connecting part 43a First top link protruding part 43c Second top link protruding part 43b First lower link protruding part 43d Second lower link protruding part 46 Rolling Support portion 47A First side frame portion 47B Second side frame portion 48 Flat surface 48A First flat surface portion 48B Second flat surface portion 49 Main rib 51A Auxiliary rib C Lifting link mechanism D Rolling regulating mechanism a, b, c, d Lateral side surface

Claims (3)

[Claims] 1. A seedling planting device (A) is attached to a rear end of a traveling machine body (3) through an elevating link mechanism (C), and a top link connecting portion (43A) is attached to the elevating link mechanism (C). A vertical link (42) having a lower link connecting part (43B) and a rolling support part (46) for supporting the seedling planting device (A) in a freely rolling manner is a lifting link structure of a rice transplanter. The vertical link (42) is cast and formed, and the vertical link (42) is provided with a main frame portion (43) having a constant short width along the longitudinal direction of the vertical link (42). (43), at different positions along the longitudinal direction, in order, a top link connecting part (43A), a lower link connecting part (43B), and a rolling bearing part (46).
And a main rib (49) extending from the rolling bearing portion (46) to a position in front of the top link connecting portion (43A) is erected, and the top link connecting portion (43A) is provided.
And the lower link connecting portion (43B) are provided so as to project from both lateral side surfaces (a) and (b) of the main frame portion (43), and extend from the one lateral side surface (a or b). And a first side frame portion (47A) connecting the first top link protrusion (43a) and the first lower link protrusion (43b), and the first side frame portion (47A) extending from the other side surface (b or a). 2 A lifting link structure of a rice transplanter provided with a second side frame part (47B) connecting the top link protrusion (43c) and the second lower link protrusion (43d). 2. Both lateral side faces (c), (d) of the main frame part (43) located between the rolling bearing part (46) and the lower link connecting part (43B).
And the regulation part (21a) belonging to the seedling planting device (A) sandwiching both lateral side faces (c) and (d) together constitute a rolling regulating mechanism (D) for the seedling planting device (A). , The lateral sides (c), (d) and the main ribs (4
9. An auxiliary rib (51A) for connecting with 9) is provided upright, and the extending direction of the auxiliary rib (51A) is set to an inclination direction that is not biased in either the longitudinal direction or the short width direction. The lifting link structure of the rice transplanter described in 1. 3. The main frame part (43) is formed with a flat surface (48) having a constant width along the longitudinal direction in a region extending from the top link connecting part (43A) to the rolling bearing part (46). At the same time, a first plane portion (48A) located between the top link connecting portion (43A) and the lower link connecting portion (43B), the lower link connecting portion (43B), and the rolling bearing portion (46). And a second flat surface portion (48B) located between
8) The lifting link structure of a rice transplanter according to claim 1 or claim 2, wherein the lifting link structure is arranged at different positions in a thickness direction orthogonal to 8).