JP3432719B2 - Earth pressure sensing device in transplanter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transplanter such as a riding rice transplanter, and more particularly, to a working unit through a hydraulic control valve based on an earth pressure load acting on a float. The present invention relates to an earth pressure sensing device in a transplanting machine that controls lifting and lowering and enables a proper transplanting operation. 2. Description of the Related Art A transplanting machine such as a riding rice transplanter is generally provided with an elevating control lever which can be operated to a manual position and an automatic position. At the automatic position of the lever, earth pressure acting on the float of the planting part is sensed, and the planting part is automatically raised and lowered by hydraulic pressure so as to be at the proper planting position. [0003] When the mud in the field scene is soft, the front portion of the float generally falls down and gets into the mud, and the planting portion sinks and the planting depth becomes too deep. 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. In order to solve such a problem, for example, as disclosed in Japanese Patent Publication No. 2-58892 and Japanese Utility Model Publication No. Sho 59-30659, the float sensing load is changed to respond. It has been known. [0005] According to this conventional example, when the mud is soft, the tension of the spring urging the float in the direction of the field is reduced, and the float can move upward even with a slight earth pressure, so that the sensitivity is sharp. The up and down movement of the float can be controlled, and when the mud is hard, the tension of the spring is increased to increase the upward movement resistance of the float so that the float does not move unless a large earth pressure is applied. The vertical movement of the float is controlled with low sensitivity. [0006] However, according to the prior art, a spring for urging the float in the field direction is disposed near the float, and the urging force of the spring is connected to the float via a link mechanism. Further, since the tension of the spring is changed by operating the adjusting lever, there is a problem that the number of parts increases and the structure becomes complicated. The load detected by the float is a load obtained by adding a link resistance or the like to the weight of the float. When a fertilizer is mounted on the body, the float is fixed to the float and inserted into the soil to travel. Due to the weight of the fertilizing nozzle to be applied and the resistance applied to the nozzle due to the sliding of the float, the front part of the float is pressed against the field scene, so that the perceived load of the float varies. For this reason, it is difficult to keep the planting part side under a certain condition in the field scene, and in order to improve planting performance, it is necessary to stabilize the perceived load of the float to some extent. The present invention has been made to solve such a problem, and an object of the present invention is to provide a sensing link mechanism for connecting a hydraulic control valve and a grounding body so that the grounding body is directed upward. It is an object of the present invention to provide an earth pressure sensing device in a transplanting machine that can provide a substantially constant sensing load acting on a ground contact body by providing an elastic mechanism for urging. In order to achieve the above object, the present invention provides a working unit (10) having a traveling body (5) having a ground contact body (14) that moves while being grounded on a field scene. To a hydraulic cylinder device (19) via a lifting link mechanism (8).
And the hydraulic cylinder device (1)
9) connecting a hydraulic control valve (35) for controlling the grounding body (14) via a sensing link mechanism (15);
The hydraulic control valve (35) is moved up and down based on an earth pressure load acting on the grounding body (14).
And the sensing link mechanism (15) in the transplanter (1) for transplanting seedlings to a field scene in the working section (10).
Is a sensing play connected to the front of the grounding body (14).
(62) and one end thereof through a swing arm (75).
The other end is connected to the sensing plate (62), and the other end is controlled by the hydraulic pressure.
With a sensing rod (39) connected to the valve (35)
The pivot (60) of the swing arm (75) is
Close to the pivot (60) via the connecting plate (23)
It is swingable about the arranged connecting shaft (21).
The sensing link mechanism (15) is arranged along the longitudinal direction of the fuselage, and is connected to the sensing rod (39).
An elastic mechanism (54) for urging the front part of the grounding body (14) upward to be provided between the plate (23) ;
It is characterized by the following. The (effect) or more, the working unit (10) is a hydraulic cylinder device (1
The hydraulic control valve (35), which is supported so as to be able to move up and down by 9) and controls the hydraulic cylinder device (19),
It is connected to a grounding body (14) via a sensing link mechanism (15), and is controlled by vertical movement of the grounding body (14) based on an earth pressure load acting on the grounding body (14). . [0010] The sensing link mechanism (15), are arranged along the longitudinal direction of the machine body, the sensing rod (3 definitive working portion (10) side of the sensing link mechanism (15)
An upward biasing force is always applied to the grounding body (14) by an elastic mechanism ( 54 ) provided between the connecting member (9) and the connecting plate (23) . For this reason, for example, the working unit (1
Even when a fertilizer or the like is attached to (0), the elastic mechanism (54) always applies an upward elastic force to the grounded body (14). The upward motion resistance is absorbed by the grounding body (1).
In (4), a substantially constant sensing load is applied. Note that the reference numerals in parentheses described above are shown for reference to the drawings, and do not limit the configuration of the present invention at all. 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 vehicle has a traveling body 5 supported by the front wheels 2 and the rear wheels 3. The traveling body 5 has an engine 6 mounted on a front portion thereof.
The driver's seat 9 having the following is provided. The driver's seat 9 is provided with an engine throttle lever 74 for controlling the running speed of the machine body and a planting clutch lever 70 for engaging and disengaging the planting clutch (see FIG. 2). Behind the traveling machine body 5, a planting section (working section) 10 is supported by a lifting link mechanism 8 having an upper link 8a and a lower link 8b so as to be able to move up and down. Planting rod 11, float (grounding body) 1
4 and a seedling mounting table 12 on which mat seedlings can be mounted. The planting section 10 can be rolled freely by a rolling shaft (not shown) installed on a link support frame 55 (see FIG. 2) at the rear end of the lifting link mechanism 8. A hydraulic cylinder device 19 is disposed between a transmission case 16 provided at the front of the traveling machine body 5 and the lifting link mechanism 8, and the hydraulic cylinder device 19 controls the hydraulic pressure. The planting part 10 is controlled to move up and down by expanding and contracting based on the operation of the valve 35. The hydraulic control valve 35 is composed of a rotary pool valve. As shown in FIGS. 1 and 2, the hydraulic control valve 35 is disposed below the driver's seat 9, and an arm 37 is attached to a shaft 35a integral with the spool. ing. The arm 37 is connected to the float 14 via a sensing link mechanism 15 described later, and the hydraulic control valve 35 is automatically controlled based on a change in the earth pressure acting on the float 14, and the hydraulic cylinder device 19 expands and contracts. The float 14 is, as shown in FIG.
The rear part is connected to a shaft 58 provided below the transmission case 61.
Are pivotally mounted via arms 57 and 59 which can be integrally rotated about the sensor plate.
2 is pivoted and connected. The transmission case 61
The fulcrum shaft 67 provided at the bottom is provided with a planting depth adjusting lever 6.
8 and the bracket 66 are integrally fixed, and furthermore, the bracket 66 and the arm 57 are pin-connected, and by manually operating the planting depth adjusting lever 68, the vertical position of the float 14 is adjusted. It is possible. Although detailed description is omitted, when the float 14 is adjusted upward or downward by operating the planting depth adjusting lever 68 up and down, the fulcrum shaft 67 rotates and the connecting rod 65 moves. Thereby, the pivot 60 of the swing arm 75 is connected to the connecting shaft 21 of the lifting link mechanism 8.
Move up and down around. As shown in FIG. 3, the sensing plate 62 has a lower end pivotally connected to the float 14 by a connecting pin 62a, and has an elongated hole 62b formed near the upper end thereof. A Bowden wire 71 is fixed to an upper end portion of the sensing plate 62, and a pin 72 fixed to an inner wire 71a of the wire 71 is fitted in the long hole 62b. Here, in the present embodiment, the sensing link mechanism 15 is arranged along the longitudinal direction of the fuselage, and the front part of the grounding body 14 is placed between the sensing rod 39 and the connecting plate 23. Elastic mechanism 5 for urging in the direction
4 is provided. That is, in FIG. 3, the sensing link mechanism 15 is arranged along the longitudinal direction of the body, and the sensing plate 62 and the sensing rod 39 connected to the sensing plate 62 via a swing arm 75. And a continuous traction link 42 connected to the sensing rod 39 via the link ratio adjusting unit 20. The other side of the continuous traction link 42 is connected to the hydraulic control valve 35. The swing arm 75 is connected to the pivot 6
A bifurcated arm 75 that can swing integrally about 0
a and 75b, and the arms 75a and 75b are connected to the lower links 8b and 8
b is arranged close to the connecting shaft 21 by a connecting plate 23 mounted on the connecting shaft 21 connecting the b. For this reason, the rotation fulcrum 60 is rotatable with respect to the connection shaft 21 of the lifting link mechanism 8 with a radius equal to the dimension between the rotation fulcrum 60 and the connection shaft 21. The sensing plate 62 and one arm 75a are connected via a pin 72 fitted in a long hole 62b of the sensing plate 62.
5a is formed in an arc shape so as not to abut on the connecting shaft 21. The sensing rod 39 is connected to the tip of the other arm 75b via a pin 32. As described above, the tip end of one arm 75a of the swing arm 75 is connected to the sensing plate 62 via the pin 72, and the tip end of the other arm 75b is connected via the pin 32 to the sensing plate 62. The two connecting portions 72, 32 are connected to the sensing rod 39, and are arranged substantially vertically apart from the connecting shaft 21. On the other hand, the above-mentioned Bowden wire 71 is connected to the pin 72, and a spring 76 is stretched between the wire connecting pin 72 and the float connecting pin 62a. The spring 76 stretches the inner wire 7la. hand,
The working length of the sensing plate 62, which is the length between the wire connecting pin 72 and the float connecting pin 62a, is set. Next, the sensing rod 39 has an elongated rod member at the center in the longitudinal direction, a link fitting 40 is integrally attached to the rear end of the rod member, and a pin is attached to the front part. A joint 38 is attached. In the link fitting 40, a pin 40a is erected near the center of one side,
A long hole 40b is formed at the other end. A pin 32 fixed to the tip of a swing arm 75b is fitted into the long hole 40b, and this pin 32 and the pin 40a
A spring 41 is stretched between them. An elastic mechanism 54 is provided on the planting portion 10 side of the sensing rod 39.
Reference numeral 4 denotes a spring mounting bracket 77 fixed to a rear portion of the sensing rod 39, a spring mounting hole 23a formed in a front portion of the connection plate 23, and a hole formed in the spring mounting hole 23a and the spring mounting bracket 77. between the number of small holes 77a which are sand
It has a spring 78 stretched between the sensing rod 39 and the connecting plate 23 . This spring 7
Numeral 8 serves to constantly bias the float 14 upward. The link ratio adjusting section 20 includes the sensing rod 3
And a conversion lever 22 for connecting the link 9 and the continuous traction link 42. The swing-side end of the conversion lever 22 and the pin joint 38 of the sensing rod 39 are pivotally mounted on the pin 27 with the pin 27. . The base end of the conversion lever 22 is pivotally connected to the lower link 8b by a pivotal connection 17. The conversion lever 22 is provided with a plurality of holes 22a along its longitudinal direction.
One end of the link 42 is attached by a pin 46 inserted into the link. Although the insertion position of the pin 46 can be freely changed by insertion and removal, the insertion position of the pin 46 can be automatically changed and controlled via an actuator, for example. The other end of the continuous traction link 42 is connected to the arm 37 of the hydraulic control valve 35 via the pin 43 as described above. Further, a pin 44 is implanted in an intermediate portion of the continuous traction link 42, and a return spring 45 is stretched on the pin 44, and the continuous traction link 42 is always lowered by the return spring 45. Biased in the direction. As described above, the earth pressure load acting on the float 14 is changed to a predetermined ratio via the link ratio adjusting section 20, and the hydraulic control valve 35 is controlled by the changed float sensing load. . That is, when the connection point between the conversion lever 22 and the continuous traction link 42 is changed by inserting and removing the intermediate pin 46 in the link ratio adjustment section 20, the pivot connection section 1
The load applied to the sensing rod 39 centered at 7 (the float 14 sensed load) and the load transmitted to the continuous traction link 42 are changed according to the connection point. For example, in FIG. 3, if the distance between the pivotal connection 17 of the conversion lever 22 and the pin 27 at the tip is R, and the distance between the pivotal connection 17 and the intermediate pin 46 is r, the sensing rod 39 is shown. The ratio of the load applied to the rod (the load sensed by the float 14) to the load transmitted to the continuous traction link 42 is r / R, and the load applied to the sensing rod 39 is enlarged and transmitted to the continuous traction link 42. From the viewpoint of the sensing load of the float 14, when the biasing force of the return spring 45 biasing the float 14 in the downward direction is P, the sensing rod 3
9, a load reduced to P · r / R is transmitted, and a load proportional to this load (P · r / R) acts in the lowering direction of the float 14 (however, the weight of the float itself and the distance between the link and the link) Friction is excluded). On the other hand, when the link ratio in the link ratio adjusting unit 20 is not changed (link ratio = R / R),
The urging force P of the return spring 45 is applied to the sensing rod 3 as it is.
Therefore, when the link ratio is changed as described above, a smaller load acts on the float 14 in a lowering direction than when the link ratio is not changed. Therefore, when the link ratio is changed, the float 14 can move upward even with a small earth pressure load, and thus the float sensing load is changed. In the above, even if the earth pressure sensing sensitivity or the float sensing load is changed by the link ratio adjustment of the link ratio adjusting unit 20, the sliding posture of the float 14 does not change at all. Next, a sensitivity adjusting lever 50 is connected to the float 14 via a wire member 71, and the vertical position of the front part of the float can be freely changed by operating the sensitivity adjusting lever 50. That is, the slot 6 of the sensing plate 62
2b is connected to the operating portion 5 on the base side of the sensitivity adjusting lever 50 via the inner wire 71b.
0a. And this sensitivity adjustment lever 5
By the operation of 0, the operating portion 50a rotates about the rotation fulcrum 51, whereby the inner wire 71b is expanded and contracted. Thus, the vertical position of the front part of the float 14 is changed, and the sliding posture of the float 14 is changed. Accordingly, the sliding posture of the float 14 can be changed by operating the sensitivity adjusting lever 50, and the earth pressure load acting on the float 14 is changed to a predetermined ratio by the link ratio adjusting section 20, and the change is performed. If the hydraulic control valve 35 is controlled by a later float load, the float posture can be freely set in accordance with the float sensing load. Further, in FIG. 3, a wire 24 is connected to the sensitivity adjusting lever 50, and the other end of the wire 24 is connected to a pin 44 erected on the link 42 via a return spring 45. Have been. The return spring 45 plays a role of constantly urging the hydraulic control valve 35 in the direction in which the float 14 is lowered. That is, as shown in FIG. 4, the wire 24 has an inner wire 24a inside, a connection fitting 25 is attached to one end of the inner wire 24a, and a hinge 26 is attached to the other end. A round hole 28 and an oblong hole 29 are formed in the connection fitting 25, and the connection fitting 25 is locked to the projection 50 b of the sensitivity adjustment lever 50 via the oval hole 29. One end of a throttle wire 73 is connected to the round hole 28, and the other end of the wire 73 is connected to an engine throttle lever 74. As described above, when the sensitivity adjusting lever 50 is tilted, the operating portion 50a also swings about the rotation fulcrum 51. Therefore, the float 14 is connected via the Bowden wire 71 connected to the operating portion 50a. The vertical position of the front is changed. At the same time, when the wire 24 locked to the projection 50b of the sensitivity adjusting lever 50 moves within the length range of the oblong hole 29 of the connection fitting 25, the urging force of the return spring 45 is changed. Is done. The change in the urging force of the return spring 45 is transmitted to the float 14 via the continuous traction link 42, the link ratio adjusting section 20, the sensing rod 39 and the like, and the float sensing load is changed. As a result, it is possible to change the sliding posture of the float 14 and the sensing load of the float 14 by the return spring 45. For example, on a soft rice field, the float sensing load is reduced and the sensing point is quickly set. However, by increasing the float sensing load and delaying the sensing point on a hard rice field, it is possible to extend the applicable range from a hard rice field to a soft rice field. Next, the operation of the above-described embodiment will be described. When a lift control lever (not shown) is moved to the automatic position, the hydraulic control valve 35 is controlled by the sensing link mechanism 15 via the swing arm 75 based on the earth pressure acting on the float 14. That is, when the planting unit 10 is at the proper planting position, the control plate (not shown) is at the fixed position via the operating shaft 35a of the hydraulic control valve 35, and the planter 10 is held by holding the hydraulic control valve 35. Hold in that position. In this state, when the planting section 10 rises with respect to the rice field surface and the earth pressure acting on the float 14 decreases, the front of the float 14 drops, and the movement is detected by the sensing plate 62.
And the pin 7 positioned at a predetermined position of the long hole 62b
The rotation is transmitted to the swing arm 75a via the rotation support 2 as a counterclockwise rotation, and the swing arm 75b is further rotated via the rotation fulcrum 60.
Also rotate in the same direction to press the sensing rod 39 to the left. Prior to the planting operation, the link ratio of the link ratio adjusting unit 20 is adjusted in advance by inserting and removing the pin 46. In this example, assuming that the paddle surface is soft, the pin 46 is moved in the longitudinal direction of the conversion lever 22. Is positioned at an intermediate position. The pressing force of the sensing rod 39 to the left at this time causes the conversion lever 22 to rotate counterclockwise about the pivotal connection 17. Then, the ratio of the amount of rotation of the sensing rod 39 in the counterclockwise direction about the pivot connection 17 to the amount of rotation of the continuous traction link 42 in the same direction is R / r, and the amount of rotation of the sensing rod 39 is R / r. Is reduced and transmitted to the continuous traction link 42 as the amount of movement to the left in the drawing. Further, the amount of movement to the left in the drawing transmitted to the link unit 42 is transmitted to the arm 37 via the pin 43, and the operating shaft 35a of the hydraulic control valve 35 is rotated clockwise. The hydraulic control valve 35 is switched to discharge the oil in the hydraulic cylinder device 19, and the cylinder device 19 is contracted to lower the planting section 10. Conversely, when the planting portion 10 descends and the earth pressure acting on the float 14 increases, the front of the float 14 rises, and the movement is detected by the sensing plate 62 and the swing arm 7.
The conversion lever 22 is rotated clockwise about the pivot connection 17 via the sensing rods 5a and 75b. The rotation of the conversion lever 22 causes the continuous traction link 4
2 to the arm 37 via the continuous traction link 42 and the pin 43.
By rotating the operating shaft 35a of the hydraulic control valve 35 in a counterclockwise direction, the hydraulic control valve 35 is switched so as to pressurize the hydraulic oil to the hydraulic cylinder device 19, and the cylinder device 19
Is extended to raise the planting section 10 to an appropriate position. In the above, even if a fertilizer or the like is attached to the planting section 10, the elastic mechanism 54 provided on the planting section 10 side of the sensing link mechanism 15 always applies an upward elastic force to the float 14. Is applied, the elastic force absorbs the upward dynamic resistance of the nozzle of the fertilizer and the like, so that a substantially constant sensing load is applied to the float 14, and therefore, a substantially constant planting depth is provided. Can be used for transplantation. As described above, according to the present invention,
Even if a fertilizer or the like is attached to the working part, the elastic mechanism always applies an upward elastic force to the grounding body, so that the elastic force absorbs the upward dynamic resistance of the nozzle of the fertilizer and the like. Since a substantially constant sensing load is applied to the ground contact body, transplantation can be performed at a substantially constant planting depth. Further, even if the planting depth is changed up and down, the elastic force of the elastic mechanism hardly fluctuates, so that the effect on the sensed load of the ground contact body is small and the sensed load is kept substantially constant. You. Further, even if link resistance is generated on the way from the mounting position of the elastic mechanism to the grounding body, these link resistances can be finally canceled out by the elastic force of the elastic mechanism. The perceived weight of the body stabilizes.

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 showing the whole earth pressure sensing device according to the present invention. FIG. 3 is a side view showing a main part of the earth pressure sensing device. FIG. 4 is an explanatory diagram of a wire connecting a sensitivity adjusting lever and a return spring. [Description of Signs] 1 Riding rice transplanter 5 Running body 8 Elevating link mechanism 10 Planting part 14 Float 15 Sense link mechanism 19 Hydraulic cylinder device 20 Link ratio adjusting part 21 Connecting shaft 22 Conversion lever 23 Connecting plate 23a Spring mounting hole 35 Hydraulic pressure Control valve 39 Sensing rod 45 Return spring 50 Sensitivity adjusting lever 54 Elastic mechanism 62 Sensing plate 70 Planting clutch lever 71 Bowden wire 74 Engine throttle lever 75 Swing arm 77 Spring mounting bracket 77a Small hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 4-74913 (JP, U) JP-A 63-7814 (JP, U) JP-B 8-11010 (JP, B2) (58) Survey Field (Int.Cl. ⁷ , DB name) A01C 11/02

Claims (1)

(57) [Claims] 1. A traveling machine which is grounded on a field scene and moves
The working part with the grounding body
The cylinder is supported by a pressure cylinder device,
The hydraulic control valve that controls the
Connected to the grounding body through
The hydraulic control bar is moved up and down based on the pressure load.
And transfer the seedlings to the field scene in the work area.
In the planting machine,The sensing link mechanism is connected to a front part of the grounding body.
A sensing plate and one end of the sensing plate via a swing arm.
And the other end is connected to the hydraulic control valve.
A pivot point for the swing arm
Is disposed close to the pivot point via a connecting plate.
It can swing around the connecting shaft, When the sensing link mechanism is arranged along the longitudinal direction of the fuselage
both,Between the sensing rod and the connection plate,Previous
Grounding bodyFront ofAn elastic mechanism that urges the
Digit, An earth pressure sensing device in a transplanter, characterized in that: