JPH08266114A - Planting depth control unit for transplanter - Google Patents

Abstract

PURPOSE: To provide a control unit enabling the variation in planting depth to be corrected so as to prevent shallow planting during the high-speed revolution of an engine. CONSTITUTION: A working part A is supported in a vertically movable way on a traveling machine body by a lift mechanism 7 with a hydraulic cylinder 7a and actuated by the operation of a changeover valve 40 having underlap position through hydraulic fluid from a hydraulic pump 7b driven by an engine 3, and the working part A is linked to the changeover valve 40 and a grounding float 60 through a hydraulic pressure sensing link mechanism D, and the transplanter is thus designed to balancedly support through the hydraulic fluid at the underlap position. In this transplanter, the control lever 3a of the engine 3 and the connecting rod 46 of the mechanism D are mutually coordinated via an interval changing mechanism E having a function to correct the working part A toward deep planting mode when the control lever 3a is operated toward the high-speed engine revolution side, thus the planting depth can automatically be controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling work machine such as a riding rice transplanter or a multi-transplanter, and more particularly to a hydraulic control device for controlling elevation of a transplanting part.

[0002]

2. Description of the Related Art Conventionally, a transplant work part such as a riding rice transplanter is supported by a switching valve so that the transplant part can be moved up and down through an elevating mechanism using a hydraulic cylinder, and the transplant part is hydraulically connected to its grounding float and the switching valve. By connecting with a sensing link mechanism and sensing the set earth pressure that the ground float receives from the ground, the switching valve is connected via the hydraulic pressure sensing link mechanism to the under valve as shown in Japanese Patent Laid-Open No. 62-257311. A transplanter has been proposed which performs transplantation work while interlocking so as to switch to the lap position and hydraulically controlling the transplantation part with a pressure oil so that the implantation depth becomes constant.

[0003]

According to the above-mentioned conventional structure, since the transplant portion is balancedly supported at the underlap position of the switching valve during the transplanting traveling work, seedlings are pierced and transplanted onto the laid sheet by the planting claws. When adjusting the engine speed over a wide range from low-speed rotation to high-speed rotation and performing transplantation work in the range from low-speed running to high-speed running, such as a multi-transplanter, the control lever of the engine must be operated in the high-speed rotating range. As a result, the hydraulic pressure generated in the hydraulic pump increases, and the equilibrium position at the underlap position of the switching valve moves to H on the hydraulic pressure lower side (D ′). Therefore, there is a drawback in that the transplantation part provided with the ground contact detection part connected by the hydraulic pressure detection link mechanism D moves to the descending side (H), that is, the shallow planting side to be in a balanced state, and tends to be shallow planting.

Therefore, there are problems that the seedlings planted with the planting nails become floating seedlings and are easily tilted on the laid sheet.

[0005]

A planting depth control device for a transplanting machine according to the present invention for solving the above-mentioned conventional problems is such that a working unit A is moved up and down by a lifting mechanism 7 by a hydraulic cylinder 7a on a traveling machine body. The working part A is lifted and lowered by operating a switching valve 40 having an underlap position, which is supported by a hydraulic pump 7b that is driven by the engine 3, and the working part A is grounded to the switching valve 40. In the transplanter in which the sensing unit 60 is connected by the hydraulic pressure sensing link mechanism D and is equilibrically supported by the pressure oil at the underlap position of the switching valve 40, the control lever 3a of the engine 3 and the hydraulic pressure sensing link mechanism D are connected. A connecting rod 46 and an interval changing mechanism E for correcting the working portion A in the deep planting direction when the control lever 3a is operated to the engine high speed rotation side. It is characterized in that to allow automatic adjustment of planting depth by to cooperative.

[0006]

[Operation] With the above configuration, when the control lever 3a is operated to the high-speed rotation side, the engine 3 is rotated at a high speed, and the correction operation mechanism F is operated to pull the inner 32 to operate the hydraulic pressure sensing link. The relationship between the oil pressure sensing link mechanism D and the equilibrium position at the underlap position N ′ of the switching valve 40 is automatically reduced by reducing the distance between the inner mounting portion 48a and the outer mounting portion 47a of the connecting rod installed in the mechanism D. To correct. As a result, the working unit A is prevented from being shallowly planted when the engine 3 is rotated at a high speed, and a change in planting depth can be easily corrected. Accordingly, the working unit A can easily correct the change in the planting depth so as to prevent shallow planting when the engine 3 is rotated at a high speed.

[0007]

EXAMPLES Examples of the present invention will be described with reference to the drawings. In FIG. 1 and FIG. 3, reference numeral 1 is a body of a passenger rice transplanter B equipped with a multi-transplanter (working section) A for planting seedlings while laying a sheet S, having front wheels 2 and rear wheels 2a, The engine 3 and the driver's seat 4 are installed near the rear.
The multi-transplanter A has a multi-device (sheet laying device) 6 at the front bottom of the transplantation part 5 at the rear of the machine body 1.
Is a hydraulic cylinder 7 that is operated via a switching valve 40 that is operated by a planting lever 4a installed on the side of the driver's seat 4.
It is supported by an elevating link mechanism (elevating mechanism) 7 which is moved up and down by a (FIG. 3) so that it can be raised and lowered.

[0008] The transplanting section 5 is located on the transmission case 5a, and is placed on the seedling mounting table 50 for mounting mat seedlings, which is obliquely installed in a front-rear-lower direction, and at the lower end of the saw-seedling mounting table 50. In addition to providing a plurality of transplant nails 51 for scraping off the seedlings of
A storage portion 6a for the sheet S rolled in front of the lower portion of the transmission case 5a and a roller float (that is, a ground sensing portion)
Multi-device 6 as a laying device for the sheet S consisting of 60
Is composed.

A sheet S, which is wider than the planting width of the seedling and is equivalent to the machine width of the transplanting section 5, is supported in the accommodating section 6a so that it can be fed out from a rolled state. A roller float 60 composed of a leading roll 62 and a trailing roll 63, which are swingably and rotatably provided by a mechanism, is extended and laid along the ground.

As shown in FIGS. 1 and 4, the roller float 60 has a support shaft 5c of a support rod 5b extending downward from the transmission case 5a, and a front roll 62 and a rear roll 63 which are pivotally supported forward and backward. The center of the link 61 is configured to be rotatable, and serves as a grounding sensing unit for sensing a planting depth, which will be described later. Reference numeral 64 is a sheet guide that supports the lower surface of the sheet S fed from the storage portion 6a to prevent the sheet S from hanging down, and 65 is pressed at both ends of the sheet S laid on the ground into the ground to prevent its rising. It is a pressure roller. In addition, 66 is the sheet S laid on the ground 5
1 is a cutter that cuts in the width direction behind the support rod 66, which is provided at an appropriate position of the transplant portion 5 so as to be able to move up and down.
The lifting / lowering lever 66b (FIG. 1) is attached to the rear end of the driver a and is installed near the driver's seat 4 so that the lifting / lowering operation is performed.

The multi-transplanter A supported by the elevating mechanism 7 has an elevating operation mechanism C similar to the known one shown in Japanese Patent Laid-Open No. 62257311, and automatically senses the depth of penetration. It is configured to be moved up and down by a hydraulic pressure sensing link mechanism D which is operated so as to have the depth to be set. That is, the raising (U), the lowering (D), the neutral (N) and the multi-transplanter A set by the planting lever 4a.
The switching valve 40 selectively operated to the automatic deepening depth position [automatic position a] of FIG. 6 is operated as shown in FIG. 6, and at the automatic position a, the hydraulic pressure sensing link is generated by the vertical movement of the roller float 60 for sensing the ground contact. Switching valve 4 via mechanism D
By switching 0, the multi-transplanter A is raised by feeding and pushing hydraulic pressure from the hydraulic pump 7b driven by the engine 3 to the hydraulic cylinder 7a (FIG. 3) at the raised position U '. Then, at the lowered position D ', the pressure oil in the hydraulic cylinder 7a is drained to lower the multi-transplanter A, and at the underlap position N'between the raised position U'and the lowered position D', the switching valve 40 is turned on. At the valve port position as shown in FIG. 7, the descending state of the multi-transplanter A due to subtle cylinder drainage and the neutral stable state due to the equilibrium of the supply / discharge hydraulic pressure are maintained.

FIG. 7 shows the above-mentioned Japanese Patent Laid-Open No. 62-257.
3D shows an example corresponding to FIG. 6 (d), where P is a pump port, C is a cylinder port,
A first passage X, a second passage Y, and a third passage Z are formed in the switching valve 40. In this state, the multi-transplanter A is connected to the hydraulic pressure sensing link mechanism D, and the roller float 60, which is elastically biased downward and is swingably rotatable, is
The switching valve 40 is moved through the hydraulic pressure sensing link mechanism D in a posture in which it moves upward or downward by the ground pressure above the set position.
Then, the multi-transplanter A is controlled to perform a correction operation to control the set automatic depth.

The structure of the hydraulic pressure sensing link mechanism D is shown in FIG.
As shown in FIGS. 3 and 5, the valve arm 40a of the switching valve 40 and the lower end of an intermediate link 42 which is swingably supported by a support shaft 41 on the machine body 1 are connected by a connecting rod 43. The other end of 42 is connected to a connecting rod 46 extending rearward, and the connecting rod 46 is bifurcated to be connected to the roller float 60 and swingably rotates about a support shaft 44 (FIG. 1). By connecting to one side of the operating link 45, a link mechanism similar to the conventional one is provided.

As a result, when the roller float 60 receives a large ground pressure due to a convex portion of the ground or the like to move upward, the hydraulic pressure sensing link mechanism D is pressed against the hydraulic cylinder 7a at the raised position U'of the switching valve 40. Operates to deliver oil and moves multi-implanter A up. In addition, the roller float 60 is reduced due to the decrease in the ground contact pressure reaching the concave portion of the ground.
When is moved downward, the multi-transplanter A is operated in the opposite manner to the above to lower the multi-transplanter A so that the implantation depth by the transplant nail 51 is controlled to be constant.

Further, the middle part of the connecting rod 46 is shown in FIG.
As shown in FIG. 5, the "interval changing mechanism E" used in the present invention is pivotally supported from the machine body 1 through the support link 46a, and the control lever 3a for adjusting the rotation of the engine 3 is used in the present invention. It is configured to be variable based on the operation of. That is, the interval changing mechanism E
As shown in FIG. 3, in a state where the connecting rod 47 provided at the end of the connecting rod 46 is fitted and supported, the fixing pieces 47a,
48a are provided, and the spring is interposed between them by compressing them. On the side of the fixed piece 47a, the control lever 3a (FIG. 1) is provided with a correction operation mechanism F (FIG. 2) described later.
The engine 3 operated by the control lever 3a by fixing the other end of the outer 31 of the operating wire 30 connected to the control wire 3 and fixing the inner 32 to the fixed piece 48a side.
In the standard speed or low speed working range of
The a and 48a intervals are maintained and regulated so as to be the set interval "K".

On the other hand, as shown in FIG. 2, the correction operation mechanism F swings on the support shaft 33 to the roller 3d pivotally attached to the end of the rotating piece 3c fixed to the rotating shaft 3b of the control lever 3a. A cam piece 35 for mounting the rotatably supported inner 32
Is joined and joined, and the outer 31 is attached to the other support piece 36 side to which the support shaft 33 is fixed so that the attachment position can be adjusted.

The cam piece 35 has a convex cam portion 35a projectingly formed at the tip thereof, and the control lever 3
When the cam piece 35 is pushed and rotates in the same direction as a is rotated in the direction of the arrow in FIG. 2A, which is the high-speed rotation side, the spring is held in a state where the outer 31 is fixed and maintained. The fixing pieces 47a, 48 against 49 (FIG. 3)
When the distance a is narrowed, the shaft rod 47 and the cylinder shaft 48 operate to contract the connecting rod 46.

As a result, the underlap equilibrium position of the switching valve 40 moves between L and H shown in FIGS. 5 and 7 when the ground sensing unit 60 is grounded. It is possible to absorb with E so as not to move on the side of the planting portion, and to make the planting depth of the planting claw 51 substantially constant. Therefore, according to the present invention configured as described above, in the transplanter having the underlap position and supporting the multi-transplanter A in equilibrium to automatically control the implantation depth, the control lever 3a is rotated at a high speed. When operated to the side, it is easy to change the planting depth so as to prevent the multi-transplanter A from being equilibrically supported by the hydraulic cylinder 7a and being shallowly planted in the pressure oil fed from the hydraulic pump 7b. And it can be corrected appropriately. Then, the traveling speed of the planting traveling work can be widely selected from the low speed to the high speed working range, and the laying of the sheet S adapted to the hard and soft condition of the field and the puddle work performed by making the sheet S common Can be performed satisfactorily and with high efficiency.

Next, referring to FIG. 4 and FIGS. 8 to 12, another structure capable of smoothly performing the above work will be described. First, referring to FIG.
Is attached to the attachment plate 64b provided on the support shaft 64a.
While being able to adjust the mounting position via 4c,
An adjusting lever 64d is provided at the other end of the mounting plate 64b to support the support shaft 6
The seat guide angle can be adjusted as shown by the dotted line in the same figure with 4a as the center.

As a result, the mud pushing at the front end portion of the seat guide 64 is reduced by displacing the ground downward depending on the hardness of the ground, and the seat S is more closely guided to the ground so that the seat S can be laid well. ing. Next, as shown in FIG. 8, the accommodating portion 6a is a support that fits and supports a roll-shaped sheet S at both ends of its cylinder core S1 inside lids 6c, 6c that are openably and closably provided on both sides of the cylinder portion 6b. Rollers 6d, 6d
Is provided.

The support rollers 6d, 6d are provided with large-diameter guide plates 6e for restricting and guiding both ends of the roll sheet S, and are laid well so as to prevent lateral deviation when the sheet S is fed out. I am able to do that. The sheet S fed out in this manner is laid on the ground by the roller floats 62, and its both ends are pressed by the press rolls 65 (FIG. 4) to complete the laying while preventing both ends from being turned over.

As shown in FIG. 9, the pressing roll 65 is
The middle portion of the support rod 65a is pivotally supported by a support shaft 65b so as to be swingable and rotatable, and the other end portion is adjusted by a swing adjusting mechanism Y to adjust the swing amount, so that it is pressed as desired according to the hardness of the ground. The seat S is laid satisfactorily. That is, the swing adjusting mechanism Y has an inverted L-shaped guide hole Y2 in which the guide pin 65c planted at the end of the supporting rod 65a is bored in the adjusting plate Y1.
While being slidably supported inward, the spring Y3 urges the spring upward, and the upward movement is restricted by the adjusting screw Y4.
The lower limit position of the presser roll 65 is appropriately regulated by the adjustment of.

On the other hand, the cutter 66 for cutting the laid sheet S is constructed as shown in FIGS. 10 to 12 so that it can be cut well. That is, in the cutter 66 shown in FIG. 10, the tip loci of the blades 66b, which are sharply formed in a saw-tooth shape at the lower end of the cutter bar 66a, are formed so that the central portion thereof projects downward in a curved shape. When the cutter 66 is moved, it is gradually cut toward both sides by the other blades 66b so that cutting can be prevented and good cutting can be performed all at once.

In the cutter 66 shown in FIG. 11, a cutter 66 having a linear blade locus is horizontally installed between the supporting rods 66S in a forwardly inclined manner, and the middle portion thereof is bent forward to be supported. When the cutter 66 is moved, the protruding blade 66b of the cutter 66 first cuts the sheet S locally and then sequentially cuts toward both sides. As a result, the same operation as that of the above embodiment is performed.

Further, as shown in FIG. 12, the cutters 66 are formed in a corrugated plate shape by bending to form adjacent blade edges 66.
It is preferable to form b, 66b ... In this case, the cutter 66 can reduce the resistance at the time of cutting and can improve the rigidity of the cutter 66. Further, as shown in FIG. 4A, the blade 66b is bent so that the blade 66b has large and small cutting angles, so that cutting can be performed well and resistance at the time of cutting can be suppressed.

[0026]

According to the first aspect of the present invention, the underlap position of the switching valve is changed by changing the length of the connecting rod through the interval changing mechanism E in association with the operation of the control lever of the engine to the high speed rotation side. Since the operation is performed, it is possible to prevent the working portion from being shallowly planted when the engine rotates at a high speed, correct the variation in the planting depth, and perform the favorable planting work.

Further, since the interval changing mechanism provided in the hydraulic pressure sensing link mechanism is operated by operating the control lever as described above, a simple and inexpensive structure can be realized and the operation can be facilitated. Can be done. According to the invention of claim 2, the gap changing mechanism can be easily installed with a compact and simple structure on the connecting rod in the hydraulic pressure sensing link mechanism that connects the switching valve and the grounded float.

[Brief description of drawings]

FIG. 1 is a side view of a transplanter equipped with an embodiment of the present invention.

FIG. 2 is a side view showing an embodiment of a correction operation mechanism,
(B) is a plan view.

FIG. 3 is an enlarged side view of a main part of the present invention.

FIG. 4 is a side view of a working unit.

FIG. 5 is a path diagram of oil pressure detection.

FIG. 6 is an operation diagram of a switching valve.

FIG. 7 is a cross-sectional view showing an underlap position of the switching valve.

FIG. 8A is a perspective view showing a storage portion of a seat, and FIG.
It is a plane sectional view of the figure (A).

9A is a side view of the presser roll, and FIG. 9B is a side view showing the operation of FIG. 9A.

FIG. 10 is a rear view of the cutter.

11A is a perspective view showing another cutter, and FIG. 11B is a side view showing the operation of FIG. 11A.

FIG. 12A is a front view showing another cutter, and FIG. 12B is a plan view of FIG.

[Explanation of symbols]

1 Aircraft 3 Engine 3a Control lever 4a Planting lever 5 Transplanting part 6 Multi-device 30 Wire 31 Outer 32 Inner 35 Cam piece 35a Cam part 40 Switching valve 42 Intermediate link 46 Connecting rod 47a, 48a Fixed piece (mounting part) 60 Roller float (Grounding sensing unit) A Multi-transplanter (Working unit) D Hydraulic pressure sensing link mechanism E Interval changing mechanism F Correcting operating mechanism

Claims (2)

[Claims] 1. A working unit A having a hydraulic cylinder 7a on a traveling body.
A lifting mechanism 7 is used to lift and lower the working unit A by operating a switching valve 40 having an underlap position for hydraulic oil from a hydraulic pump 7b driven by the engine 3, and the working unit A is moved up and down. The switching valve 40 and the ground contact sensing unit 60 are connected to the hydraulic pressure sensing link mechanism D.
In the transplanter in which the control valve 3 is connected to the control valve 3 and is equilibrium supported by the pressure oil at the underlap position of the switching valve 40, the control lever 3a of the engine 3 and the connecting rod 46 of the hydraulic pressure sensing link mechanism D are connected to each other by the control lever 3a. When the engine is operated to the high-speed rotation side of the engine, the working depth of the planting depth of the transplanting machine is automatically adjusted by connecting the working unit A through the interval changing mechanism E that corrects in the deep planting direction. Control device. 2. The inner 32 of the wire 30 actuated by the correction actuating mechanism F provided on the control lever 3a is attached to one mounting portion 48a on which one of the gap changing mechanisms E provided on the hydraulic pressure sensing link mechanism is adjusted. The outer side 31 is attached to the other mounting portion 47a, and a spring 49 for setting a gap is provided between the both mounting portions 48a and 47a.
The implanting depth control device for a transplanter according to claim 1, wherein the implanting depth control device is provided.