JP2000253712A - Mechanism for lifting and lowering working device of working machine in paddy field - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly lift quadric link mechanisms for the capacity of a hydraulic cylinder. SOLUTION: This mechanism is obtained by composing quadric link mechanisms 4 from lower links 6 and upper links 7 for connecting to a mobile machine body so as to vertically freely rotate around each of a first shaft center P1 and a second shaft center P2 and vertical links 8 for attaching a working device capable of connecting to the rear of the lower links 6 and the upper links 7 so as to vertically freely rotate around a third second shaft center P3 and a fourth shaft center P4 and further a hydraulic cylinder 5 capable of performing shortening operations, thereby lifting the quadric link mechanisms 4, carrying out extending operations and thereby lowering the quadric link mechanisms 4. In a state of the quadric link mechanisms 4 located at parts in the lower region of a lifting and lowering range, a pivotally connecting point R1 of the hydraulic cylinder 5 to the mobile machine body 1 is located at a rear position of the second shaft center P2 and a pivotally connecting point R2 of the hydraulic cylinder 5 with the quadric link mechanisms 4 is made coincident with the third shaft center P3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for connecting a paddy working device such as a seedling planter to a rear portion of a self-propelled body so as to be able to move up and down, and for driving and lowering the paddy working device.
Specifically, a lower link is connected to a rear part of the self-propelled body so as to be rotatable up and down around a first axis in a left-right posture, and a vertical link is pivoted around a rear part of the self-propelled body around a second axis in a left and right posture. An upper link that is freely connected to the lower link, and is connected to a rear portion of the lower link so as to be rotatable up and down around a third axis in a left-right orientation, and is vertically connected to a rear portion of the upper link around a fourth axis in a left and right orientation. A vertical link for movably connecting the working device and a quadruple link mechanism for connecting the paddy field working device to the self-propelled body so as to be able to move up and down freely are constructed. By shortening the operation, the four link mechanism is raised and extended. The present invention relates to a working device lifting / lowering mechanism of a paddy field working machine provided with a hydraulic cylinder that operates to lower a four-link mechanism.

[0002]

2. Description of the Related Art When a working device lifting mechanism of this kind is used, a four-link mechanism, that is, a paddy working device is pulled up against its weight by shortening operation of a hydraulic cylinder. There is an advantage that the paddy field working device can be moved up and down while using a cheap and inexpensive one.

Conventionally, as a working device elevating mechanism of a paddy working machine having such advantages, there is disclosed in Japanese Patent Laid-Open No. 9-233906.
As disclosed in Japanese Unexamined Patent Application Publication No. H11-264, a mechanism is known in which a hydraulic cylinder is erected over a second shaft center and a third shaft center so that a four-link mechanism is moved up and down as the hydraulic cylinder expands and contracts.

[0004]

However, in the case of the above-mentioned conventional technique, the lifting force accompanying the shortening operation of the hydraulic cylinder is transmitted to the four-link mechanism with sufficient efficiency to raise the four-link mechanism smoothly. However, in order to reduce the capacity of the hydraulic cylinder and reduce the cost, it was necessary to use a hydraulic cylinder that requires large capacity and cost.

SUMMARY OF THE INVENTION It is an object of the present invention to efficiently transmit a pulling force caused by a shortening operation of a hydraulic cylinder to a four-link mechanism, and to raise the four-link mechanism smoothly in proportion to the capacity of the hydraulic cylinder. The point is to make it possible.

[0006]

The features, functions and effects of the present invention according to claims 1 and 2 are as follows.

A feature of the present invention according to claim 1 is that a lower link is connected to a rear portion of the self-propelled body so as to be rotatable up and down around a first axis in a left-right posture, and a left and right direction is formed on a rear portion of the self-propelled body. An upper link rotatably connected up and down around a second axis in a posture; and an upper link rotatably connected up and down around a third axis in a left and right posture to a rear part of the lower link, and a left and right part connected to a rear part of the upper link. A quadruple link mechanism for vertically connecting a paddy working device to a self-propelled body from a vertical link for mounting a working device that is vertically rotatably connected around a fourth axis in an orientation posture, and shortening the operation. A working device elevating mechanism for a paddy field working machine provided with a hydraulic cylinder for lowering the four-link mechanism by raising and extending the four-link mechanism, wherein the four-link mechanism is located below the elevating range. To be located in the side area And a line connecting the pivot connection points of the hydraulic cylinder to the self-propelled body and the four-link mechanism, respectively, and a line connecting the pivot connection points of the hydraulic cylinder to the four-link mechanism and the first shaft center. The first angle formed by the minute
A line connecting the second axis and the third axis, and the third axis and the first axis;
The point is that the position of the pivot connection point is set so as to be larger than the second angle formed by the line segment connecting the axes.

[Features of the Invention According to Claim 2] Claim 1
In the present invention, the pivot connection point of the hydraulic cylinder to the quadruple link mechanism is made coincident with the third shaft center, and the pivot connection point of the hydraulic cylinder to the self-propelled body is located behind the second shaft center. It is in the point where it is made.

[Operation] The pivot connection point of the hydraulic cylinder to the vertical link is made coincident with the third shaft center, and the pivot connection point of the hydraulic cylinder to the self-propelled body is located behind the second shaft center. Since the first angle is larger than the second angle, a hydraulic cylinder is provided between the second axis and the third axis, that is, the first angle is equal to the second angle. Compared with a conventional technique, the lifting force associated with the shortening operation of the hydraulic cylinder in the lower region can be efficiently transmitted to the four-link mechanism to raise the four-link mechanism.

[Effects] Accordingly, the four-link mechanism can be smoothly raised by dividing the capacity of the hydraulic cylinder, and the hydraulic cylinder can be reduced by raising the four-link mechanism by the shortening operation of the hydraulic cylinder. Capability and cost reduction can be realized.

The features, functions and effects of the present invention according to claim 3 are as follows.

[Features] In the present invention according to the first and second aspects of the present invention, there is provided an operation state in which the relative movement between the cylinder tube and the piston rod of the hydraulic cylinder toward the extension side is prevented by tension, and a release state in which the tension is released. The point is that a descent restricting device that can be freely switched is provided.

[Operation] An operation state in which the extension operation of the hydraulic cylinder is prevented so as to prevent the four-link mechanism from descending;
Since a descent restricting device that can be operated to switch between a release state that allows extension operation to allow the descent of the link mechanism is provided, it is possible to plant the plant by switching the descent restriction device to the released state during work. By switching the lowering control device to the working state during non-working such as transporting on a truck bed while raising and lowering the intended paddy working equipment for adjusting the depth etc. Regardless of leakage of the hydraulic circuit to the hydraulic cylinder, the four-link mechanism, that is, the paddy field working device, can be reliably held in a floating state above the ground instead of the hydraulic cylinder.

[Effect] Therefore, while the paddy field working device is raised and lowered at the time of work, unexpected lowering of the paddy field working device at the time of non-working can be surely prevented.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, a rice transplanter, which is an example of a paddy field working machine, has a seedling planting device, which is a paddy field working device, at the rear of a riding type self-propelled body 1. 2 is connected so as to be able to drive up and down freely, and a fertilizer application device 3 is provided.

The self-propelled body 1 has a body frame provided with a pair of left and right driving front wheels 1A for steering and a pair of left and right driving rear wheels 1B, and an onboard driving section 1D provided with an engine 1C and a seat 1a. It is configured to be mounted.

The means for connecting the seedling planting apparatus 2 to the self-propelled body 1 so as to be able to drive up and down is connected to the seedling planting apparatus 2 so as to be able to move up and down freely as shown in FIGS. Do 4
The link mechanism 4 is provided, and the link mechanism 4 is shortened in accordance with the supply of the pressurized oil, so that the link mechanism 4 is raised against the weight of the link mechanism 4 and the seedling planting apparatus 2, and is extended with the drainage. Thus, a hydraulic cylinder 5 for lowering the four-link mechanism 4 by weight is provided.

The quadruple link mechanism 4 includes a pair of left and right lower links 6 connected to the rear part of the self-propelled body 1 so as to be rotatable up and down around a first axis P1 in a left-right orientation, and a rear part of the self-propelled body 1. And a pair of left and right upper links 7 which are vertically swingably connected around a second axis P2 in a left-right orientation, and are rotatable up and down around a third axis P3 in a left-right orientation at the rear of the lower link 6. A vertical link 8 for attaching a seedling planting device, which is connected to the rear part of the upper link 7 and is connected to the rear part of the upper link 7 so as to be rotatable up and down around a fourth axis P4 in a left-right orientation.

The hydraulic cylinder 5 has a cylinder tube 5A connected to the rear part of the self-propelled body 1 at the bottom so as to be rotatable up and down around an axis in a left and right posture, and a left and right posture to the four-link mechanism 4 at a tip. And a piston rod 5B connected via a lifting member 9 so as to be rotatable up and down around the axis.

When the four-link mechanism 4 is located in the lower region of the lifting range, the hydraulic cylinder 5 is pivotally connected to the self-propelled body 1 and the four-link mechanism 4 by pivot connection points R1 and R2.
A first angle α formed by a first line segment L1 connecting the first and second lines L2 connecting the pivot connection point R2 of the hydraulic cylinder 5 to the quadruple link mechanism 4 and the first shaft center P1 is the first angle α. A second angle β formed by a third line segment L3 connecting the two axes P2 and P3 and a fourth line L4 connecting the third axis P3 and the first axis P1.
The positions of the pivot connection points R1 and R2 are set so as to be larger. Specifically, the pivot connection point R1 of the hydraulic cylinder 5 to the self-propelled body 1 is located behind the second axis P2, and the pivot connection point R2 of the hydraulic cylinder 5 to the four-link mechanism 4 is set. With the third axis P3.

The piston rod 5B of the hydraulic cylinder 5
As shown in FIGS. 5 and 6, a suspension spring 10 that receives a compressive force as the hydraulic cylinder 5 is shortened is interposed between the lifting member 9 and the lifting member 9. In other words, the hydraulic cylinder 5 is shortened to operate the suspension spring 10.
The four link mechanism 4 is lifted by pulling the lifting member 9 through. The suspension spring 10 is made of urethane rubber.

As shown in FIGS. 5 and 6, the distal end of the piston rod 5B is inserted into the piston rod 5B while allowing the lifting member 9 to move in the expansion and contraction direction with respect to the piston rod 5B. A pair of left and right guide rods 11 for restricting a change in posture of the lifting member 9 around the rod axis between the lifting member 5B and the lifting member 9 are provided. The hydraulic cylinder 5 moves the four-link mechanism 4 to the cylinder tube 5A above the lifting range. The extension operation of the hydraulic cylinder 5 is pulled by engaging with the stopper 11A at the tip end of the guide rod 11 by swinging around the axis P in the left-right posture in the state of the telescopic length positioned in the region. With an operating portion 12a that can be switched between an action position that prevents the operation of the hydraulic cylinder 5 and a release position that releases the pulling by releasing and allows the hydraulic cylinder 5 to extend. Seigu 12 is attached.

The seedling planting apparatus 2 is of a multi-row planting type, and is provided with a seedling stand 14 which is reciprocally driven by a set stroke to the left and right on a planting frame 13 connected and supported by the vertical link 8. And a seedling planting mechanism 15 for taking out a unit amount of seedling from the lower end of the seedling stand 14 and planting it in a field scene by operating in conjunction with the movement of the seedling stand 14, and sliding in a field scene to be planted. It has a well-known basic structure assembled with a ground float 16 for leveling. As shown in FIG. 7 and FIG. 8, a support frame 16 for movably stopping and supporting the seedling rest 14 is provided on each of the left and right ends of the planting frame 13. As shown in FIGS. 7 and 8, a marker support frame 17 is fixed to each of the support frames 16. As shown in FIGS. 7 and 8, each of the marker support frames 17 is a line drawing marker that is swingably switchable between an operating position for lying down and forming a next run index groove line in a field scene and an upright storage position. 18 are attached.

The operating means of the drawing marker 18 is provided with a spring 19 for urging the drawing marker 18 to the operating position, as shown in FIGS. The slider 21 is connected to the marker support frame 17 by moving the wire drawing marker 18 from the acting position to the retracted position against the urging force of the spring 19 by moving the drawing marker 18 inwardly to the left and right by a spring 20. When the slider 21 is moved to the storage position where the drawing marker 18 is swung to the storage position, the slider 2 is biased by the fixing spring 22.
1 is attached to the marker support frame 17 for automatically rocking engagement with the engaging portion 21a formed on the marker supporting frame 17 to lock the slider 21 in the storage position. Accordingly, an interlocking lever 26 for pushing and swinging the slider 21 to the storage position via a wire 25 by being pressed and swinging by an arm 24 connected to the upper link 7 is attached to the vertical link 8, and a switch by a marker operation lever 27. A release solenoid 28 is mounted on the marker support frame 17 so as to release and swing the lock member 23 against the urging force of the fixing spring 22 by energizing by operation. That is, the raising of the seedling planting device 2 swings the drawing marker 18 in the action position to the storage position, automatically holds the storage position in the storage position by the lock member 23, and selects one of the right and left by the selection operation via the marker operation lever 27. The lock member 23 is unlocked to swing the selected drawing marker 18 to the operating position with the urging force as the seedling planting device 2 descends.

As shown in FIGS. 11 and 12, the fertilizer applicator 3 includes a hopper 29 for storing fertilizer and a seedling planter 2.
Each time the hopper 2 rotates fixedly in one direction in conjunction with the operation of
A feeding roll 30 for feeding a certain amount of the fertilizer in 9;
An electric fan 31 for generating an airflow for pumping the feed fertilizer; a groove forming device 32 for forming a fertilizer groove next to each planting strip and supplying the fertilizer sent to the fertilizer groove; And a supply hose 33 for guiding to each groove forming device 32.

The means for driving the delivery roll 30 projects another power take-out shaft 35, which is linked to a power take-out shaft 34 to the seedling planting device 2, upward into the transmission case M at the rear of the self-propelled body 1. The other power take-out shaft 35 is provided with a transmission shaft 36 having a universal joint and a crank arm 38 interlocked via a bevel gear mechanism 37.
9 and is provided with an operating lever 40 that swings one reciprocation along with one rotation of the crank arm 38 to thereby rotate the feeding roll 30 fixedly through a one-way clutch (not shown). I have.

[Alternative Embodiment] As shown in FIGS. 13 and 14, instead of the fertilizer application device 3, an extension step 50 used for placing a mat seedling a wound in a roll shape or the like is used. , That is, a rice transplanter mounted at the rear of the seat 1a. As shown in FIGS. 15 and 16, the extension step 50 includes a rear upper portion 51 of the left and right rear wheel fenders 51.
a seat placed on the rear middle portion 51b of the rear wheel fender 51 with the left and right legs 50a at the front, and supporting the seat 1a with the left and right central legs 50b projecting forward. It is fixed to the self-propelled body 1 by being connected to the frame 52 with bolts. And it is comprised by connecting 50 A of left and right divided bodies. The divided body 50A includes a plate-shaped frame member 53a and a pipe frame member 5a.
3b, and a metal plate 54 for forming a mounting surface such as a stainless steel plate or an iron plate is attached to the frame 53. The two divided bodies 50A are connected by connecting the plate-shaped frames 53a with bolts. I have. The front part of the plate-like frame 53 is the leg part 50b.

[Brief description of the drawings]

Fig. 1 Side view of rice transplanter

FIG. 2 is a plan view of a rice transplanter.

FIG. 3 is a side view of a quadruple link mechanism.

FIG. 4 is a plan view of a quadruple link mechanism.

FIG. 5 is a side view showing a four-link mechanism in an up-fixed state;

FIG. 6 is a perspective view of a main part of a hydraulic cylinder.

FIG. 7 is a front view of a main part of the seedling planting device.

FIG. 8 is a cutaway enlarged front view of a main part of the seedling planting device.

FIG. 9 is a side view of a main part of a four-link mechanism.

FIG. 10 is an operation explanatory view of a lock mechanism.

FIG. 11 is a rear view of the fertilizer application device.

FIG. 12 is a cutaway side view of a main part of the fertilizer application device.

FIG. 13 is a side view of a rice transplanter showing another embodiment.

FIG. 14 is a plan view of a rice transplanter showing another embodiment.

FIG. 15 is a perspective view of an extension step.

FIG. 16 is a side view of a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Self-propelled body 2 Paddy working device 4 Quadruple link mechanism 5 Hydraulic cylinder 5A Cylinder tube 5B Piston rod 6 Lower link 7 Upper link 8 Vertical link 12 Lowering restricting tool P1 1st axis P2 2nd axis P3 3rd axis P4 4th axis R1 pivot connection point R2 pivot connection point L1 line segment L2 line segment L3 line segment L4 line segment α first angle β second angle

 ──────────────────────────────────────────────────の Continued on the front page (72) Yoshiaki Sonoda 64, Ishizukitamachi, Sakai City, Osaka Prefecture Inside the Kubota Sakai Plant (72) Inventor Hiroaki Kitai 64, Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. Office (72) Inventor Masakazu Furuichi 64 Ishizu-Kitacho, Sakai City, Osaka Prefecture Inside Kubota Sakai Plant (72) Inventor Kenji 64 Ishizu-Kitamachi, Sakai City, Osaka Prefecture F-term in Kubota Sakai Plant (Reference) 2B062 AA14 AB01 BA62 BA72 2B304 KA03 LA02 LA09 LB05 LB16 LC04 MA02 MB02 MC13 RA11

Claims (3)

[Claims] A lower link connected to a rear part of the self-propelled body so as to be rotatable up and down around a first axis in a left-right posture; and a vertical link to a rear part of the self-propelled body around a second axis in a left-right posture. An upper link rotatably connected to the lower link, and a vertical link rotatably connected to a rear portion of the lower link around a third axis in a left-right attitude, and a fourth axis in a left-right attitude to the rear portion of the upper link. A vertical link for mounting the working device, which is vertically rotatably connected, and the paddy field working device is connected to the self-propelled body so as to be able to move up and down.
A working device lifting / lowering mechanism for a paddy working machine, comprising a hydraulic cylinder configured to form a continuous link mechanism, and to raise the quadruple link mechanism by performing a shortening operation and to lower the quadruple link mechanism by performing an extending operation. In a state where the four-link mechanism is located in the lower region of the elevating range, a line segment connecting the pivot connection points of the hydraulic cylinders to the self-propelled body and the four-link mechanism, respectively, The first angle formed by the pivot connection point to the link mechanism and the line connecting the first axis is the line connecting the second axis and the third axis, and the third axis and the first axis. A working device lifting mechanism for a paddy working machine, wherein the position of the pivot connection point is set so as to be larger than a second angle formed by a line connecting the cores. 2. The pivot connection point of the hydraulic cylinder to the quadruple link mechanism is made coincident with the third shaft center, and the pivot connection point of the hydraulic cylinder to the self-propelled body is positioned behind the second shaft center. The working device lifting / lowering mechanism of the paddy field working machine according to claim 1, wherein: 3. A descent restricting device operable to switch between an operation state in which the relative movement of the cylinder tube and the piston rod of the hydraulic cylinder to the extension side is prevented by tension and a release state in which the tension is released. 1 or 2
The working device elevating mechanism of the paddy working machine according to the above.