JP2004215524A - Farm work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a farm work machine in which a farm implement can be rolled on a longitudinal rolling shaft with respect to a traveling frame and is rolled by extending or contracting a rolling cylinder device wherein one of a cylinder body and a piston is connected to the traveling frame and the other is connected to the farm implement, and can smoothly be rolled, and which can prevent the failure and breakage of the connection portions. <P>SOLUTION: In at least one of the two connection portions, ball joints 57A, 57B are disposed between the members to be connected. In the other of the two connection portions, the members to be connected are connected in a state capable of being freely rotated on a vertical shaft 54 and on a longitudinal shaft 53. In at least one of the two connection portions, the members to be connected can freely be moved in the longitudinal direction or in the vertical direction in a state controlling the movement in the lateral direction. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural work machine having a traveling machine body and an agricultural work device mounted so as to be able to roll around a rolling axis in a front-rear direction, and more particularly to a structure of a mounting portion of a rolling cylinder device for rolling the agricultural work device.
[0002]
[Prior art]
A farm work machine in which a farm work device is mounted on a traveling machine so as to be capable of rolling around a rolling axis in the front-rear direction, for example, a riding rice transplanter, is a seed planting section that is a farm work device so that the seeding planting depth of each row is the same. Is operated in accordance with the left and right inclination of the field. When a cylinder device is used as a means for rolling the seedling mounting portion, the rolling cylinder device is provided in a lateral direction at a position deviated vertically from the rolling axis, and one of the cylinder body and the piston is provided on the traveling body side. The other is connected to the seedling planting part side (for example, see Patent Document 1). In the riding rice transplanter described in Patent Literature 1, the cylinder body of the rolling cylinder device is connected to the traveling machine body side, and the piston is connected to the seedling planting section side.
[0003]
[Patent Document 1]
JP-A-7-23635
In the riding rice transplanter having the above configuration, when the rolling cylinder device is extended and contracted to perform the rolling operation of the seedling planting portion, the connecting portion between the cylinder body and the traveling machine body side, and the connecting portion between the piston and the seedling planting portion side. Horizontal and vertical displacements occur. In order to absorb the displacement and smoothly perform the rolling operation, the cylinder body is rotatably supported around the longitudinal axis with respect to the traveling machine body, and the piston and the seedling mounting part are connected with the universal joint. Are linked through.
[0005]
[Problems to be solved by the invention]
However, the rolling shaft is actually not exactly in the front-rear direction, but is slightly inclined downward so that the seedling placement position (the front-back position) is located near the extension of the rolling shaft. For this reason, by the rolling operation of the seedling planting part, not only the lateral displacement and the vertical displacement but also the front-back positional displacement of the connecting portion occur. Due to the displacement in the front-rear direction, the smooth rolling operation of the seedling planting part was impaired, and the connecting part was easily broken or damaged. Therefore, in a farming machine, such as a riding rice transplanter, in which a farming machine is mounted on a traveling machine so as to be able to roll around a rolling axis in the front-rear direction, the rolling operation of the farming machine is smoothly performed, and the failure and breakage of the connecting portion are prevented. Is the task of the present invention.
[0006]
[Means for Solving the Problems]
The present invention has adopted the following countermeasures against the above problems. That is, in the agricultural working machine according to claim 1, the agricultural working device is provided so as to be rollable with respect to the traveling machine body around the rolling axis in the front-rear direction, and one of the cylinder body and the piston is connected to the traveling machine body side and the other is connected to the farm working device side. In the agricultural working machine that performs rolling operation of the agricultural working device by expanding and contracting the rolling cylinder device connected to the at least one of the two connecting portions, a configuration in which a plurality of ball joints are interposed between objects to be connected. It is characterized by doing.
[0007]
Further, the agricultural working machine according to claim 2 is provided with the agricultural working device so as to be rollable with respect to the traveling machine body around the rolling axis in the front-rear direction, and connects one of the cylinder body and the piston to the traveling machine body side and the other to the farm working device side. In the agricultural working machine that performs rolling operation of the agricultural working device by extending and contracting the rolling cylinder device connected to the at least one of the two connecting portions, at least one of the two connecting portions rotates the connected objects around the vertical axis and the front-rear axis. It is characterized by being movably connected.
[0008]
Further, in the agricultural working machine according to claim 3, the agricultural working device is provided so as to be rotatable with respect to the traveling machine body around the rolling axis in the front-rear direction, and one of the cylinder body and the piston is connected to the traveling machine body side and the other is connected to the farm working device side. In the agricultural working machine that performs rolling operation of the agricultural working device by expanding and contracting the rolling cylinder device connected to the at least one of the two connecting portions, the front-rear direction or the state where the connected objects are restricted from moving in the left-right direction or It is characterized in that it has a configuration that allows flexibility in vertical movement.
[0009]
【The invention's effect】
In the case of claim 1, the degree of freedom of the connecting portion is improved by interposing a plurality of ball joints between objects to be connected in the connecting portion between the rolling cylinder device and the traveling machine body side or the agricultural work device side. Can be In the case of the second aspect, by connecting the objects to be connected in the connecting part so as to be rotatable about the vertical axis and the front-back axis, the connecting part can move three-dimensionally. . Furthermore, in the case of the third aspect, the load applied to the connecting portion is released by allowing the connected objects in the connecting portion to move in the front-rear direction or the vertical direction while restricting the movement in the left-right direction. be able to. Therefore, by effectively combining the configurations of the first to third aspects, the rolling operation of the agricultural working device can be smoothly performed, and the failure and breakage of the connecting portion can be prevented.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2 show a riding fertilizer rice transplanter which is an example of an agricultural working machine according to the present invention. In the riding fertilizer rice transplanter 1, a 10-row planting seedling planting section 4 as an agricultural work device is mounted on the rear side of the traveling machine body 2 via an elevating link device 3 so as to be able to ascend and descend. 5 body parts are provided.
[0011]
The traveling body 2 is a four-wheel drive vehicle including front wheels 6, 6 and rear wheels 7, 7, 8, 8, 9, 9, and can change the rotational power of the engine 10 with the first belt transmission 11 and the transmission ratio. The transmission power is transmitted to the transmission case 13 through the second belt transmission 12, and separated into driving power and PTO power by the transmission case. The front wheels 6, 6 and the rear wheels 7, 7, 8, 8 are driven by the driving power. , 9, and 9 as well as the seedling planting section 4 and the fertilizer application device 5 by the PTO power. A driver's seat 15 is provided in the front and rear center of the upper part of the fuselage, and a steering handle 16 for steering the front wheels 6 and 6 is provided in front of the driver's seat 15.
[0012]
The elevating link device 3 is configured as a parallel link mechanism in which a vertical link 22 is pivotally connected to the rear ends of the upper link 20 and the lower links 21 and 21 rotatably attached to the rear end of the traveling body 2. The seedling planting part 4 is rotatably connected to a rolling shaft 23 that projects slightly obliquely downward and rearward from the lower end of the seedling 22. The angle of the rolling shaft 23 is determined such that the seedling planting position (the front-back position of the seedling planting device 32,... Described later) is located near the extension of the rolling shaft. When the lifting and lowering cylinder device 24 is extended and contracted, the upper link 20 and the lower links 21 and 21 rotate up and down, and the seedling placement unit 4 moves up and down with a substantially constant posture. When the rolling cylinder device 25 is expanded and contracted, the seedling placement unit 4 rolls around the rolling shaft 23. The structure of the mounting portion of the rolling cylinder device 25 will be described later in detail.
[0013]
The seedling placement part 4 includes a seedling placement part frame 30 having a built-in transmission mechanism, a seedling placement table 31 on which seedlings are placed and reciprocated right and left to supply seedlings one by one to a seedling outlet 31a,. A seedling planting device 32 for planting the seedlings supplied to the outlets 31a in the field, floats 33 for leveling, etc. are provided, and the seedling planting section reaches a position where the floats 33 contact the mud surface. When the traveling body 2 is moved forward by lowering the float 4, the floats 33,... Slide on the mud surface to level the ground, and the seedling planting devices 32,. Has become. As shown in FIG. 3, the seedling mounting table 31 has a lower end slidably supported by a left-right guide frame 34 and a lower end fixed to the seedling mounting frame 30. A roller 36 attached to the guide frame 35 moves along a left-right rail 37 provided on the upper rear surface of the seedling mounting table. , The seedling table 31 reciprocates left and right.
[0014]
The fertilizer applicator 5 feeds the fertilizer in the fertilizer tanks 40, 40 downward by a fixed amount by the fertilizer feeding sections 41,..., And feeds the fed fertilizer in the fertilizer transfer pipes 43,. Are transferred to the field from the fertilizer discharge ports of the groove forming bodies 44 attached to the left and right sides of the floats 33.
[0015]
Next, the structure of the mounting portion of the rolling cylinder device 25 will be described with reference to FIGS.
[0016]
The rolling cylinder device 25 is a double-acting hydraulic cylinder in which piston rods 25b, 25b project from both sides of the cylinder body 25a, and a rolling control valve 26 is formed integrally with the cylinder body 25a. In this rolling cylinder device 25, a cylinder body 25 a is attached to the upper part of the vertical link 22 so as to face the left and right direction, and the distal ends of the piston rods 25 b, 25 b are connected to the connection plate 50, which is fixed to the seedling mounting guide frame 35. 50.
[0017]
Regarding the mounting of the cylinder body 25a, a U-shaped cylinder holding frame 52 in a side view is mounted on a mounting plate 51 projecting upward from the upper end of the vertical link 22 by a shaft 53 in the front-rear direction. The cylinder main body 25 a is rotatably mounted inside the holding frame 52 by vertical shafts 54, 54. Therefore, the cylinder main body 25a is rotatable around the axis in the front-rear direction and rotatable about the axis in the up-down direction. Further, since the hole 55 of the mounting plate into which the shaft 53 in the front-rear direction is inserted is a vertically long hole, the cylinder main body 25a is mounted with flexibility in the vertical movement. In addition, the hole of the cylinder holding frame 52 through which the shaft 54 in the up-down direction is inserted may be formed as a long hole in the front-rear direction, and the cylinder body 25a may be attached in a state of having flexibility in the movement in the front-rear direction.
[0018]
As for the connecting portion 56 between the piston rod 25b and the connecting plate 50, a first ball 57A screwed on the piston rod 25b and a second ball 57B screwed on the connecting plate 50 are provided in abutting relationship with each other. A first boot 58A slidably in contact with the outer periphery of the ball 57A and a first boot 58B slidably in contact with the outer periphery of the second ball 57B are connected by a hub 59. That is, it has a structure in which two ball joints are connected, and has a higher degree of freedom in changing the angle between the piston rod 25b, which is a connected object, and the connecting plate 50, as compared with a normal ball joint having only one ball.
[0019]
When the rolling cylinder device 25 is operated to project one piston rod and retract the other piston rod, the projecting connecting plate 50 is pushed outward, and the retracting connecting plate 50 is pulled inward. Thus, the seedling planting section 4 performs a rolling operation with the rolling shaft 23 as a fulcrum. This rolling operation is controlled by a rolling control device described below.
[0020]
FIG. 6 shows the configuration of the rolling control device. A rolling angle sensor 61 for detecting an angle of the seedling placement section 4 with respect to the traveling body 2, a left and right inclination sensor 62 for detecting left and right inclination of the traveling body 2, an inclination angular velocity sensor 63 for detecting a changing speed of the left and right inclination of the traveling body 2, An engine rotation sensor 64 for detecting the engine speed and a seedling table position sensor 65 for detecting the right and left position of the seedling table 31 are connected to the input side of the controller 66, and the clockwise rotation of the rolling control valve 26 which is a proportional solenoid valve. And a counterclockwise solenoid 67R, 67L, and a speed change motor 68 for changing the transmission ratio of the second belt transmission 12 are connected to the output side of the controller 66. The following control is performed by the rolling control device.
[0021]
When the traveling body 2 and the seedling planting section 4 are tilted to the left or right during the planting operation, the left and right tilt sensor 62 and the tilt angle sensor 63 detect this, and based on the detection result, the seedling planting section 4 moves right and left. The signal is output to the solenoid 26a or 26b of the rolling control valve 26 so that the rolling cylinder device 25 expands and contracts to the side that returns to horizontal. Then, when the rolling angle sensor 61 detects the horizontal direction of the seedling placement section 4, the output is stopped. By controlling in this way, the floats 33,... Of the seedling planting section 4 come into contact with the ground and slide, and the seedling planting depth of each line is constant.
[0022]
The rolling control output is calculated based on the value of the left and right tilt sensor 62 when the value of the tilt angle sensor 63 is within a predetermined range, and is calculated when the value of the tilt angle sensor 63 is out of the predetermined range. Calculated based on the value of If the value of the inclination angle sensor 63 is out of the predetermined range, it means that the traveling machine body 2 and the seedling planting part 4 are suddenly tilted right and left, so that the rolling operation of the seedling planting part 4 needs to be performed quickly. There is. However, because of the characteristics of the rolling cylinder device 25, it is difficult to perform the rolling operation of the seedling planting section 4 too quickly, so that the control cannot keep up with the actual inclination and floating seedlings or deep planting may occur. Therefore, in order to prevent this, control is performed so as to output to the speed change motor 68 and change the vehicle speed in accordance with the value of the inclination angle sensor 63. As a result, it is possible to maintain an appropriate vehicle speed at which accurate rolling control is possible, improve seedling planting accuracy, and prevent mud pushing by the floats 33,.
[0023]
Further, when the seedling mounting table 31 is located at a position greatly deviated from the center in the left and right direction, a large output is required for the rolling operation of the seedling placement section 4, and therefore, as shown in FIG. When the predetermined value is exceeded, the on-time of the rolling output is increased, and when it is within the specified value of the seedling mounting position sensor 65, the on-time of the rolling output is reduced. Thereby, the rolling control can be stabilized.
[0024]
FIG. 8 is a hydraulic circuit diagram showing a part of the hydraulic device. A state in which the pressure oil from the hydraulic pump 70 is supplied to the left cylinder chamber 25cL of the rolling cylinder device 25 via the pilot check valve 71L by the rolling control valve 26, and a state in which the rolling cylinder device is supplied via the pilot check valve 71R. The state is switched between a state of supplying to the right cylinder chamber 25cR of 25 and a state of returning to the tank 72 without supplying to any of the cylinder chambers. A pressure regulating valve 73 (see FIG. 9) is provided between the hydraulic paths connected to the two cylinder chambers 25cL and 25cR to release the pressure oil from the high pressure side to the low pressure side when the pressure difference exceeds a certain value. Accordingly, when an external force of a certain pressure or more is applied to the rolling cylinder device 25, the pressure regulating valve 73 is opened, and oil moves from the high pressure side cylinder chamber to the low pressure side cylinder chamber to absorb the external force, and the rolling cylinder The device 25 is prevented from being damaged. The surface F1 of the spool 73a of the pressure regulating valve 73 that receives pressure on the left cylinder chamber 25cL side has the same area as the surface F2 that receives pressure on the right cylinder chamber 25cR side.
[Brief description of the drawings]
FIG. 1 is a side view of a riding fertilizer rice transplanter.
FIG. 2 is a plan view of the riding fertilizer rice transplanter.
FIG. 3 is a front view of a seedling planting section.
FIG. 4 is a rear view showing a mounted state of the rolling cylinder device.
FIG. 5 is a side view showing a mounting state of a cylinder body of the rolling cylinder device.
FIG. 6 is a block diagram of a rolling control device.
FIG. 7 is a flowchart of rolling control relating to the left and right positions of the seedling mounting table.
FIG. 8 is a hydraulic circuit diagram showing a part of the hydraulic device.
FIG. 9 is a diagram showing a structure of a pressure regulating valve.
[Explanation of symbols]
1 Riding fertilizer rice transplanter (agricultural work machine)
2 Traveling body 3 Elevating link device 4 Seedling planting section (farm work equipment)
5 Fertilizer Applicator 23 Rolling Shaft 25 Rolling Cylinder Device 26 Rolling Control Valve 25a Cylinder Body 25b Piston Rod 31 Seedling Stand 53 Front-rear Shaft 54 Vertical Shaft 55 Hole 56 for Inserting Front-Rear Shaft Hole Connection 57A First Ball (ball joint)
57B 2nd ball (ball joint)

Claims (3)

The agricultural work device is provided so as to be rollable with respect to the traveling body around the rolling axis in the front-rear direction. An agricultural working machine for rolling an agricultural working device, wherein at least one of the two connecting portions has a configuration in which a plurality of ball joints are interposed between objects to be connected. The agricultural work device is provided so as to be rollable with respect to the traveling body around the rolling axis in the front-rear direction. In the agricultural working machine that performs the rolling operation of the agricultural working device, at least one of the two connection portions is configured to connect the objects to be connected to each other so as to be rotatable around a vertical axis and a front-rear axis. Agricultural work machine. The agricultural work device is provided so as to be rollable with respect to the traveling body around the rolling axis in the front-rear direction. In the agricultural working machine that performs the rolling operation of the agricultural working device, at least one of the two connecting portions has a configuration in which the objects to be connected have flexibility in the movement in the front-rear direction or the up-down direction with the movement of the connected objects restricted in the left-right direction. An agricultural working machine characterized by the following.

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