JP2000201512A - Soil pressure sensitivity adjusting apparatus in transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ordinarily retain a planting part in a fixed position by constantly energizing a float under given pressure in the downward direction and to adjust the planting part by the optimum position and pushing force. SOLUTION: A hydraulic control valve 30 for controlling a hydraulic cylinder apparatus 14 is connected through a sensitivity adjusting mechanism 32 to a float 24. The position of a planting part 20 and the pushing force of the float 24 are controlled based on a soil pressure load acting on the float 24. The sensitivity adjusting mechanism 32 is equipped with a return spring 62 for energizing the hydraulic control valve 30 in the downward direction of the float 24 and an electric motor 63 capable of adjusting the energizing pressure of the return spring 62. When a sensitivity adjusting dial 33 is rotated and operated by fingers, the position of the float 24 is changed through a float sensitivity adjusting wire 45, the length of the return spring 62 is changed by a valve interlocking wire 70 and the pushing pressure of the float 24 is changed. Hydraulic sensitivity is controlled by the changes of the position and the pushing pressure of the float 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transplanting machine such as a rice transplanter for riding, and more particularly to a transplanting machine such as a rice transplanting machine. The present invention relates to an earth pressure sensing device in a transplanter.

[0002]

2. Description of the Related Art A transplanting machine such as a riding rice transplanter is provided with an elevation control lever which can be operated manually and automatically. The operation of the lever makes it possible to control the elevation of the planting section and to control the elevation of the lever. At the automatic position, the vertical movement of the planting unit is controlled by hydraulic pressure so that the planting unit is at the proper planting position by sensing the earth pressure acting on the float of the planting unit.

[0003] When the mud in the field is soft, the front part of the float generally falls down and penetrates into the soil to cause mud pushing. On the other hand, when the mud in the field scene is hard, the front part of the float rises and the planting part floats up and the planting depth becomes shallow, and the rock tends to be frequently swung up and down due to the soil mass and the like.

[0004] As means for solving this problem, for example, when the mud is soft, the urging force for urging the float in the direction of the field is weakened so that the float can move upward even with a slight earth pressure, so that the float can be moved with sharp sensitivity. The vertical movement of the float can be controlled, and when the mud is hard, the urging force is increased to increase the upward movement resistance of the float, and the float has a low sensitivity so that the float does not move unless a large earth pressure is applied. For example, there is a method in which the sensing load of the float is changed in size to control the vertical movement of the float.

[0005] For example, as described in Japanese Patent Publication No. 2-58892, the vertical movement of the float is controlled with high sensitivity in accordance with the hardness of the field scene, or the float is controlled by decreasing the sensitivity, thereby detecting the float. It is known that the load is changed and the ground contact load is increased during high-speed running to suppress frequent lifting and lowering control.

[0006] Further, Japanese Patent Application Laid-Open No.
As described in No. 92205, a hydraulic sensitivity adjustment lever for adjusting the float sensitivity is connected to an automatic hydraulic sensitivity adjustment means so that the float sensitivity is reduced only when the engine speed is increased. It is.

[0007]

However, according to the above-mentioned prior art, the manual operation of the hydraulic sensitivity adjusting lever or the like in accordance with the hardness of the field scene changes the float's sensing load each time. It was difficult to make the optimal adjustment according to the situation.

[0008] In addition, the float sensitivity is reduced only when the engine speed is increased.
It has been difficult to finely adjust the float sensitivity in response to fluctuations in engine speed from high to low speeds.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is an object of the present invention to normally urge a grounding body (float) in a downward direction at a predetermined pressure so as to move a working unit to a predetermined position. It is an object of the present invention to provide an earth pressure sensing device for an implanting machine that can be held in a posture and that can adjust a working unit with an optimum posture and pressing force according to a situation.

[0010]

According to one aspect of the present invention, there is provided a hydraulic cylinder device (14).
The attitude of the working unit (20) supported by the traveling body (15) so as to be able to move up and down is sensed by the earth pressure load acting on the grounding body (24) moving on the ground in the field scene,
A hydraulic control valve (30) for controlling the hydraulic cylinder device (14) is connected to the grounding body (24) through a sensitivity adjusting means (32) to reduce an earth pressure load acting on the grounding body (24). In the transplanter (11), which is capable of controlling the attitude of the working unit (20) based on the sensitivity adjusting means (32).
Connects the hydraulic control valve (30) to the grounding body (24).
A biasing member (62) that constantly urges the urging member in a downward direction, and an electric actuator (63) that can adjust the biasing pressure of the biasing member (62).

According to a second aspect of the present invention, the electric actuator (63) is driven based on a manual operation so as to adjust the urging pressure of the urging member (62) and to reduce the engine speed. The biasing pressure of the biasing member (62) can be finely adjusted by automatically driving the biasing member (62), and when the engine speed is high, the biasing pressure of the biasing member (62) is adjusted to increase. When the engine speed is low, the urging pressure of the urging member (62) is adjusted to be weak.

According to the present invention, the hydraulic control valve (30) is connected to the grounding body (24) through the sensitivity adjusting means (32). The attitude of the working unit (20) is controlled based on the earth pressure load acting on (24).
2) connecting the hydraulic control valve (30) to the grounding body (24)
A biasing member (62) that constantly biases the body in a downward direction, and an electric actuator (63) that can adjust the biasing pressure of the biasing member (62). When the turning operation is manually performed, the electric actuator (63) is driven in accordance with the amount of the turning, the posture of the grounding body (24) is changed, and the urging member (6) is changed.
The urging pressure in 2) is adjusted to be strong or weak, and the pressing force of the grounding body (24) against the field surface changes.

The electric actuator (63)
Is controlled automatically based on the magnitude of the engine speed. For example, when the engine speed is high, the biasing pressure of the biasing member (62) is controlled to be strong, and the grounding member is controlled. (24) The pressing force against the rice field surface becomes large, and the hydraulic sensitivity becomes insensitive. When the engine speed is low, the biasing pressure of the biasing member (62) is controlled to be weak,
The pressing force against the rice field surface of the ground contact body (24) becomes small, and the hydraulic sensitivity becomes sensitive.

Note that the reference numerals in parentheses described above are shown for reference to the drawings, and do not limit the invention specifying matter of the present invention.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall side view of a riding rice transplanter to which the present invention is applied. As shown in FIG.
The traveling body 1 supported by the front wheels 12 and the rear wheels 13
The traveling body 15 has an engine 1 at the front.
A driver seat 19 having a seat 17 is disposed at a substantially intermediate position between the front and rear wheels 12 and 13. In the driver's seat 19, an engine throttle lever 27 for controlling the body running speed is provided at a front portion, and a planting clutch lever (hydraulic / planting lever) 28 for engaging and disengaging a planting clutch at a side portion of the seat 17. Are arranged.

Behind the traveling body 15, a planting section 20 as a working section includes an upper link 18a and a lower link 1a.
8b, is supported by a lifting link mechanism 18 having a lifting mechanism 8b. The planting section 20 has a large number of planting rods 21, a float 24 as a grounding body, and a seedling mounting table 22 on which mat seedlings can be placed. Is provided. In addition, this planting part 20
Can be rolled freely by a rolling shaft (not shown) installed on a link support frame 23 at the rear end of the lifting link mechanism 18.

A hydraulic cylinder device 14 is disposed between a rear portion of a front axle (not shown) for supporting the front wheels 12 and the elevating link mechanism 18, and the hydraulic cylinder device 14 operates. The planting portion 20 is controlled to move up and down by expanding and contracting based on the operation of a hydraulic control valve 30 disposed below the seat 19. For example, in FIG. 2, the hydraulic cam 29 is manually operated by moving the planting clutch lever 28 to each of “up”, “fixed”, “down”, and “planting” positions along a guide groove (not shown). Is rotated about the camshaft 29a, and the hydraulic control valve 30, which is a rotary pool valve, is rotationally controlled, so that the planting section 20 is controlled to move up and down.

Further, the hydraulic control valve 30 has an arm 31 attached to a shaft 30a integral with the spool. The arm 31 is connected to the float 24 via a sensitivity adjusting mechanism 32 as sensitivity adjusting means. The hydraulic control valve 30 is automatically controlled based on the fluctuation of the earth pressure acting on the float 24 and the hydraulic cylinder device 14 expands and contracts, and the planting section 20 is automatically controlled to move up and down.

As shown in FIG. 2 described above, the float 24 has an arm 36 having a rear portion integrally rotatable about a shaft 35 provided at a lower portion of a transmission case 34.
The sensor plate 37 is pivotally mounted via a and 36b, and a sensing plate 37 is pivotally connected to a front portion thereof. A planting depth adjusting lever 39 and a bracket 40 are integrally fixed to a fulcrum shaft 38 provided on the transmission case 34, and the bracket 40 and the arm 36a are further pin-connected to each other, so that the planting By manually operating the depth adjusting lever 39, the float 24 can be adjusted in its vertical position.

Although the detailed description is omitted, if the float 24 is adjusted upward or downward by operating the planting depth adjusting lever 39 up and down, the fulcrum shaft 38 rotates and the connecting rod 41 moves. As a result, the rotation fulcrum 43 of the swing arm 42 is connected to the connecting shaft 4 of the lifting link mechanism 18.
Move up and down around 4.

As shown in FIGS. 2 and 3, the sensing plate 37 has a lower end pivotally connected to the float 24 by a connecting pin 37a, and has an elongated hole 37b formed near the upper end thereof. Further, a float sensitivity adjusting wire 45 is fixed to an upper end portion of the sensing plate 37, and a pin 46 fixed to an inner wire 45a of the wire 45 is fitted into the long hole 37b.

Here, the sensitivity adjusting means 32 in the present invention.
The hydraulic control valve 30 is connected to the grounding body (float).
An urging member that constantly urges the urging member 24 in the lowering direction and an electric actuator that can adjust the urging pressure of the urging member are provided.

2 and 3, the sensitivity adjusting mechanism 32 includes a sensing plate 37, a sensing rod 47 connected to the sensing plate 37 via a swing arm 42, and a link ratio adjusting mechanism for the sensing rod 47. A return spring 62 that constantly biases the float 24 in the downward direction, and an electric motor 63 that can adjust the biasing pressure of the return spring 62. are doing.

First, the swing arm 42 is connected to the pivot 4
A fork-shaped arm 42 that can swing integrally about 3
a, 42b, and the arms 42a, 42b are connected to the lower link 18 on the right and left sides of the body at the rear of the lifting link mechanism 18.
b and 18b are arranged close to the connecting shaft 44 by a connecting plate 50 mounted on the connecting shaft 44 connecting the b and 18b. For this reason, the rotation fulcrum 43 is rotatable with a radius equal to the distance between the rotation fulcrum 43 and the connecting shaft 44.

The sensing plate 37 and one arm 42a are connected via a pin 46 inserted into a long hole 37b of the sensing plate 37, and the arm 4a
2a is formed in a curved shape so as not to abut on the connecting shaft 44. The sensing rod 47 is connected to the tip of the other arm 42b via a pin 51.

As described above, the distal end of one arm 42a of the swing arm 42 is connected to the sensing plate 37 via the pin 46, and the distal end of the other arm 42b is connected to the sensing rod via the pin 51. The two connecting portions 46 and 51 are arranged substantially vertically apart from the connecting shaft 44.

On the other hand, to the pin 46 connecting the swing arm 42a and the sensing plate 37, the above-mentioned float sensitivity adjusting wire 45 is connected.
A spring 52 is stretched between the float connecting pin 37a and the inner wire 45.
The working length of the sensing plate 37, which is the length between the wire connecting pin 46 and the float connecting pin 37a, is set by positioning a.

Next, the sensing rod 47 has an elongated rod member at the center in the longitudinal direction, a link fitting 53 is integrally attached to a rear portion of the rod member, and a pin joint portion is provided at a front portion. 54 are attached. The link fitting 53 has a pin 53a planted near the center on one side and an elongated hole 53b formed at the other end. A pin 51 fixed to the tip of the swing arm 42b is fitted into the elongated hole 53b, and a spring 55 is stretched between the pin 51 and the pin 53a.

The link ratio adjusting section 48 includes the sensing rod 4
And a conversion lever 56 for connecting the pulling link 7 to the continuous traction link 49. The swinging end of the conversion lever 56 and the pin joint 54 of the sensing rod 47 are rotatably mounted on a pin 57. . The base end of the conversion lever 56 is pivotally connected to the lower link 18b by a pivot connection 58. A plurality of holes are formed in the conversion lever 56 along the longitudinal direction thereof.
9, one end of the continuous traction link 49 is attached. The insertion position of the pin 59 can be freely changed by insertion and extraction.

The other end of the link 49 is connected to the arm 31 of the hydraulic control valve 30 via the pin 60 as described above. Further, a pin 61 is implanted at an intermediate portion of the continuous traction link 49, and a return spring 62 as an urging member is stretched on the pin 61, and the continuous traction link 49 is formed by the return spring 62. Always float 24
Is urged in the downward direction.

Next, as shown in FIGS. 3 and 4, a sector gear 65 is pivotally mounted on a fixed frame 64 near the planting clutch lever 28 by a gear shaft 66 so as to be swingable. The gear 65 is meshed with a gear 67 fixed to an output shaft of the electric motor 63. The electric motor 63 is connected to a sensitivity adjusting dial 33 provided in the driver's seat 19, and the sector gear 65 is provided with fixing pins 68, 69 at both ends in the swing direction thereof. ing. The one fixing pin 68 is connected to the return spring 62 via an inner wire 70a of the valve interlocking wire 70, and the other fixing pin 69 is connected to the float 24 via the mounting metal 71 by the inner wire 45a of the float sensitivity adjusting wire 45. It is connected to the.

On the other hand, a potentiometer 72 for detecting the amount and direction of rotation of the gear shaft 66 is connected to a control unit 73 and the engine throttle lever 27
The potentiometer 74 for detecting the operation amount of the
It is connected to the.

Further, in the present invention, the electric actuator (electric motor) 63 is driven based on a manual operation so that the urging pressure of the urging member (return spring) 62 can be adjusted and based on the engine speed. It is automatically driven to enable fine adjustment of the biasing pressure of the biasing member 62.

That is, when the sensitivity adjustment dial 33 is rotated and adjusted by manual operation, for example, the electric motor 63 is driven via the control unit 73 in accordance with the amount of rotation, whereby the float sensitivity adjustment wire 45 is expanded and contracted. , The posture of the float 24 changes, and the valve interlocking wire 70
, The length of the return spring 62 is changed, and the pressing force of the float 24 against the rice field changes. Thus, the movement of the float 24 is restricted by the change in the posture and the pressing force of the float 24, and the hydraulic sensitivity is adjusted.

The engine throttle lever 27
When the engine speed is high, the electric motor 63 is driven via the control unit 73 to increase the urging pressure of the return spring 62, and the push of the float 24 against the rice pad is performed. As the pressure increases, the float sensitivity becomes less sensitive. Similarly,
When the engine speed is low, the electric motor 6 is controlled via the control unit 73 so that the urging pressure of the return spring 62 is weakened.
3 is driven, the pressing force of the float 24 against the rice pad surface becomes small, and the float sensitivity becomes sensitive.

Next, the operation of the above-described embodiment will be described.

When the planting clutch lever 28 is operated to the "automatic" position, the hydraulic control valve 30 is automatically controlled by the sensitivity adjusting mechanism 32 through the swing arm 42 based on the earth pressure acting on the float 24. . That is, when the planting section 20 is at the proper planting position, the hydraulic control valve 30 is held to hold the planting section 20 at that position.

From this state, when the planting section 20 rises with respect to the rice field surface and the earth pressure acting on the float 24 decreases, the front of the float 24 drops, and the movement is detected by the sensing plate 37.
And the pin 4 positioned at a predetermined position of the long hole 37b
6, the rotation is transmitted to the swing arm 42a as a counterclockwise rotation about the rotation fulcrum 43 (see FIG. 3), and the swing arm 42b also rotates in the same direction to move the sensing rod 47 to the left. Press.

As a result, the conversion lever 56 rotates counterclockwise in FIG. 3 around the pivotal connection portion 58, and moves the continuous traction link 49 leftward in the drawing. The movement amount at this time is transmitted to the arm 31 via the pin 60, and the operating shaft 30a of the hydraulic control valve 30 is rotated clockwise to discharge the oil in the hydraulic cylinder device 14 from the hydraulic control valve 30. And the cylinder device 14 is contracted to lower the planting portion 20.

On the contrary, the planting section 20 descends and the float 2
When the earth pressure acting on the float 4 increases, the front of the float 24 rises, and the movement is caused by the sensing plate 37 and the swing arm 42.
The conversion lever 56 is rotated clockwise in FIG. 3 around the pivot connection portion 58 via the sensing rods 47 a and 42 b. The rotation of the conversion lever 56 moves the continuous traction link 49 rightward in the drawing. The movement amount at this time is transmitted to the arm 31 via the pin 60, and rotates the operating shaft 30a of the hydraulic control valve 30 in the counterclockwise direction.
The hydraulic control valve 30 is switched so as to pressurize the hydraulic oil to the hydraulic cylinder device 14, and the cylinder device 14 is extended to raise the planting section 20.

In order to adjust the hydraulic sensitivity by manual operation, in FIG. 4, when the sensitivity adjustment dial 33 is rotated to the insensitive side by a finger, the electric motor 63 is controlled via the control unit 73 in accordance with the amount of rotation. Is driven, and the sector gear 65
Swings in the direction A in FIG.
The inner wire 45a is loosened, the tension of the spring 52 on the sensing plate 37 side is reduced, the force for lifting the front part of the float 24 is reduced, and the posture of the float 24 is lowered forward. At the same time, the valve interlocking wire 7
Since the zero is pulled, the urging force of the return spring 62 is increased, the pressing force of the float 24 is increased, and the operating shaft 30a of the hydraulic control valve 30 is rotated clockwise in FIG. The planting section 20 is lowered.

When the sensitivity adjustment dial 33 is rotated to the sensitive side in the opposite direction to the above, the sector gear 65 swings in the direction B in FIG. 4, and the inner wire 45a of the float sensitivity adjustment wire 45 is pulled, and the sensing is performed. The tension of the spring 52 on the plate 37 side increases, the force for lifting the front part of the float 24 increases, and the posture of the float 24 rises forward. At the same time, the valve interlocking wire 70
, The urging force of the return spring 62 is weakened, and the pressing force of the float 24 is reduced, and the operating shaft 30a of the hydraulic control valve 30 is rotated counterclockwise in FIG. The planting section 20 rises. Thus, the movement of the float 24 is restricted by the change in the posture of the float 24 and the change in the pressing force against the rice paddle surface, and the hydraulic sensitivity is adjusted.

Next, the electric motor 63 is automatically driven based on the engine speed, and the urging force of the return spring 62 is automatically adjusted.

That is, the engine throttle lever 27
The swing amount (angle) of the throttle lever 27 is detected by a potentiometer 74, and the magnitude of the swing amount of the throttle lever 27 is used to determine the engine speed. When the engine speed is high, the sector gear 65 The electric motor 63 is automatically driven via the control unit 73 so as to swing in the direction A of FIG. In this way, the urging force of the return spring 62 is adjusted to be strong, the pressing force on the pad surface of the float 24 increases, and the float sensitivity becomes insensitive. Conversely,
When the engine rotation speed is low, the sector gear 65
The electric motor 63 is automatically driven via the control unit 73 so as to be swung in the direction, so that the urging force of the return spring 62 is adjusted to be weak, and
In No. 4, the pressing force on the paddle surface becomes small, and the float sensitivity becomes sensitive.

As described above, the electric motor 63 is automatically controlled by the manual dial operation or the engine speed, the posture of the float 24 is changed, and the urging force of the return spring 62 is adjusted to adjust the hydraulic sensitivity. .

[0047]

As described above, according to the first aspect of the present invention, the sensitivity adjusting means includes an urging member for constantly urging the hydraulic control valve in the lowering direction of the grounding member, and a biasing member for the urging member . With the provision of the electric actuator capable of adjusting the urging pressure, it is possible to normally urge the grounding body by the urging member at a predetermined pressure in the downward direction at all times and to maintain the working unit in the predetermined posture, With the electric actuator, the working unit can be controlled with the optimum posture and pressing force according to the situation.

According to the second aspect of the present invention, the electric actuator can adjust the urging pressure of the urging member manually or automatically, and can control the working unit to an arbitrary posture based on the manual operation. In addition to this, the urging pressure of the urging member can be automatically controlled according to the fluctuation of the engine speed, and the working unit can be controlled with the optimum posture and the pressing force according to the transplantation speed.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter to which the present invention is applied.

FIG. 2 is a side view of a state where a float and a hydraulic control valve are continuously pulled by a sensitivity adjusting mechanism.

FIG. 3 is a side view showing a main part of a sensitivity adjustment mechanism.

FIG. 4 is an enlarged perspective view of a main part of a sensitivity adjustment mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Riding rice transplanter 14 Hydraulic cylinder device 15 Traveling body 18 Elevating link mechanism 20 Planting part 24 Float 27 Engine throttle lever 28 Planting clutch lever 30 Hydraulic control valve 32 Sensitivity adjusting mechanism 33 Sensitivity adjusting dial 45 Float sensitivity adjusting wire 62 Return spring 63 Electric motor 70 Valve interlocking wire 73 Control unit

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 2B062 AA20 AB01 CA02 CA04 CA06 CB04 2B063 AA20 AB01 CA04 CA07 CA10 CB11

Claims (2)

[Claims] 1. An attitude of a working unit supported by a hydraulic cylinder device so as to be able to ascend and descend to a traveling machine body is sensed by an earth pressure load acting on a grounded body that moves while being grounded on a field scene, and the hydraulic cylinder device is controlled by the hydraulic cylinder device. A hydraulic control valve to be controlled is connected to the grounding body via a sensitivity adjusting means, and the transplanter is capable of controlling the posture of the working unit based on an earth pressure load acting on the grounding body. A transplanting machine, comprising: an urging member that constantly urges the hydraulic control valve in a downward direction of the grounding body; and an electric actuator that can adjust an urging pressure of the urging member. Earth pressure sensitivity adjustment device. 2. The electric actuator is driven based on a manual operation to adjust the urging pressure of the urging member, and is automatically driven based on an engine speed to urge the urging member. The pressure can be finely adjusted. When the engine speed is high, the urging pressure of the urging member is adjusted to be high, and when the engine speed is low, the urging pressure of the urging member is weakened. The earth pressure sensitivity adjusting device in the transplanting machine according to claim 1, wherein the adjustment is performed as follows.