JPH0716332B2 - Hydraulic control system for paddy work vehicle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a paddy field vehicle such as a passenger rice transplanter, and more particularly to a hydraulic control device for vertically moving a working unit such as a planting unit.

(B) Conventional technology Generally, a passenger rice transplanter is equipped with a raising / lowering control lever that can be operated in a manual operation position and an automatic position. At the automatic position, the earth pressure acting on the float of the planting part is detected, and the planting part is automatically moved up and down so as to reach the proper planting position.

Conventionally, a hydraulic control valve that is switched by the elevating control lever and controls a hydraulic cylinder device for elevating a planting part has a common raised position and fixed (neutral) regardless of a manual position and an automatic position. It has a position and a lowered position.

(C) Problems to be solved by the invention For this reason, when the lift control lever is set to a fixed position by manual control, a special mechanism is required to prevent the vertical movement of the float related to automatic control from acting on the hydraulic control valve. Then, the structure becomes complicated. Further, in the case of automatic control, since it is necessary to switch the control valve with good response following the movement from the float, it is necessary to set the fixed position of the control valve to be extremely narrow. Therefore, in the manual control, in order to set the lifting control lever to the fixed position, it is necessary to accurately position the lever at the extremely narrow fixed position of the control valve, which makes the fixing of the planting part troublesome. Furthermore,
At the time of automatic control, it constantly fluctuates finely around the fixed (neutral) position, and the wear progresses quickly.However, when the planting part is fixed by manual control, the narrow fixed position and wear are combined to prevent leakage. The amount increases, and the fixed state cannot be maintained sufficiently.

Therefore, it is an object of the present invention to provide a hydraulic control device for a paddy work vehicle that solves the above-mentioned drawbacks by providing the hydraulic control valve with separate switching positions for manual operation and automatic operation.

(D) Means for Solving the Problem The present invention has been made in view of the above circumstances,
As shown in the figure, the shift pattern of the elevating control lever 20 is configured by manual raising U, manual fixing N, (semi-automatic or automatic) lowering D and automatic A positions, and a hydraulic control valve.
35 has positions of manual raising U ', manual fixing N', lowering d, automatic fixing n and automatic raising u, and arranging the manual raising U and the automatic raising u at both ends. Is characterized by.

(E) Action Based on the above configuration, raise and lower the control lever 20 to the manual raising position U
When turned down, the hydraulic control valve 35 is switched to the raised position U ', and pressure oil is sent to the hydraulic cylinder device 19 to raise the planting portion. When the lifting control lever 20 is held at the fixed position N, the control valve 35 is set at the fixed position N'and holds the planting portion at that height. Further, when the raising / lowering control lever 20 is tilted (semi-automatically or automatically) to the lowered position D, the control valve 35 is first brought to the lowered position d, the oil in the hydraulic cylinder device 19 is discharged, the planting portion is lowered, and When the float of the attached portion is grounded and moves upward, the movement is detected by the sensing rod 39 and the continuous check link 42.
It is transmitted to the control plate 36 via the, and the plate 36 is switched to the automatic fixing position n in a state where the planting portion is lowered to the proper position. Then, when the lifting control lever 20 is held at the automatic position A, the control valve 35 switches between the raising position u, the fixed position n, and the lowering position d in the automatic range A by the movement of the linkage link 42 based on the movement from the float. The planting section is automatically kept at the proper height.

(F) Example Hereinafter, an example of the present invention will be described with reference to the drawings.

As shown in FIG. 11, the riding rice transplanter 1 has a traveling machine body 5 supported by front wheels 2 and rear wheels 3. The traveling machine body 5 has an engine 6 mounted on the front portion of the front wheels thereof. At the same time, the driver's seat 9 is arranged so that the seat 7 is positioned in the middle portion between the front and rear wheels, that is, the center of gravity of the machine. Further, a planting part 10 is supported at the rear of the traveling machine body 5 via a link 8 so as to be able to move up and down, and a large number of planters 11, ..., Floats 14 and mat seedlings are vertically arranged in the planting part 10. A long seedling stand 12 that can be placed half and a half is provided. Further, a hydraulic cylinder device 19 is provided between the front mission case 16 of the traveling vehicle body 5 and the bracket 17 fixed to the link 8, so that the hydraulic cylinder device 19 can be expanded and contracted by a hydraulic control valve described later. Based on this, the planting unit 10 moves up and down.

As shown in FIG. 1, the driver's seat 9 is provided with a planting part elevation control lever 20 on the side of the seat and a side clutch pedal 21 on the front part of the step. The lever 20 is supported by a pin 23 provided on a pivot support plate 22 so as to be swingable in the left-right direction, and the pivot support plate 22 is a seat column.
A bracket 25a fixed to the side of 25 is rotatably supported by a pin 26 protruding in the horizontal direction (fourth position).
See figure). Further, a cam arm 27 is rotatably supported by the bracket 25a, and a roller 22a provided on a pivot support plate 22 is in rolling contact with a cam surface 27a of the arm 27. And
A continuous swing arm 30 is connected to the pivot plate 22 via a rod 29, and a rectangular hole 30a is formed in the continuous swing arm 30. Further, as shown in detail in FIG. 6, an arm 32 is rotatably supported by a pin 33 on the column 25.
The tip pin 32a of 32 is engaged with the rectangular hole 30a,
A pin 32b is planted at the other end. On the other hand, a hydraulic control valve 35, which is a rotary pool valve, is installed on the seat column 25, and as shown in FIG. 7, a plate 36 having an elongated hole 36a is fixed to a shaft 35a integral with the spool. And the arm 37 is rotatably attached to the shaft 35a.
Is supported, and the pin 32b extends through the slot 36a so as to abut the arm 37. In addition, the sensing rod 39 (first portion) extending from the float 14 of the planting portion 10
(Refer to the drawing) is connected to a continuous link 42 via an arm 41 rotatably supported by a frame 40.
The arm 37 is connected to the tip of 42. Further, a pin 43 is planted in the middle ear portion of the continuous check link 42, and a spring 45 is stretched between the pin 43 and the pin 32b.

On the other hand, the left and right side clutch pedals 21, 21 are respectively provided with cam pieces 4 on their pivot boss portions 21a, 21a as shown in detail in FIG.
6a, 46b are fixedly provided, and the tip end portions of these cam pieces are formed in a substantially arc surface. An arm 49 is rotatably supported on a pivot shaft 47 planted in the frame 40. The arm 49 is provided at its tip with a roller 49 with which the cam pieces 46a, 46b can abut. At the same time, a plate 50 having a fastening portion 50a made of a nut at the tip is fixedly installed. Therefore, either the left or right side clutch pedal
When the pedal 21 is depressed, the arm 49 is rotated by the cam piece 46a coming into contact with the roller 49a, but the cam piece 46a comes into contact with the roller 49a while the pedal 21 is being depressed and the cam piece 49a is rotated by a predetermined amount. After that, even if the pedal 21 is fully depressed, the operation amount of the arm 49 hardly changes. Further, another plate 52 is rotatably supported on the pivot shaft 47, and a fastening component 53 formed of a bolt that penetrates a boss portion and is screwed into the fastening portion 50a is formed in an intermediate portion of the plate 52. The two plates 50 and 52 are overlapped with each other by the fastening and rotate integrally. Further, as shown in FIGS. 1 and 4, a rod 55 extending from the continuous pulling arm 30 is fitted in a hole formed at the tip of the plate 52 and is provided between the rod 55 and the nut 55a. The spring 56 is retracted, and the plate 52 and the continuous swing arm 30 are
Furthermore, the control lever 20 is continuously connected. On the other hand, an arm 54 extending from the planter clutch is arranged near the side clutch pedal 21 as shown in FIGS. 1 to 3, and a spring 57 is connected to the arm 54. . Further, a wire 59 is connected to the other end of the spring 57, and the other end of the wire 59 is connected to the other end of the cam arm 27. The other end of the spring 57 is also connected to another wire 60, and the other end of the wire 60 is connected to the arm 49.
It is connected to a lug 49c fixed to the.

Then, as shown in FIGS. 1 and 8, the control lever 20 moves along the guide groove 62a of the guide plate 62 in the raised position U,
The control plate 36 of the hydraulic control valve 35 is controlled to be switched to the fixed position N, the lowered semi-automatic position D and the automatic position A, and
It is controlled to switch to a raising position U (raising range U ′), an underlap R, a fixed position N (fixing range N ′), a lowering semi-automatic range D and an automatic range A. The valve 35 is forcibly controlled by the lever 20 at the raised position U and the fixed position N, but in the lowering semi-automatic range D and the automatic range A, the planting is performed within the play range of the rectangular hole 30a of the continuous swing arm 30. Sensing rod 3 from attachment 10
It is controlled by the continuous check link 42 via 9 and in the automatic range A, lowering d, fixing n, underlap r and raising u
Of the automatic range A and the fixed semi-automatic range D include the lowering d of the automatic range A and the fixed position n. More specifically, as shown in FIG. 9, the hydraulic control valve 35 has a manual raising U ′, a manual fixing N ′, a combination of manual and automatic so that the manual raising U ′ and the automatic raising u are located at both ends. They are arranged in the order of lowering d, automatic fixing n, and automatic raising u. Further, as shown in detail in FIG. 10, the valve operating angle (control plate operating angle) and the spool opening area have a relationship as shown in the figure. Further, underlaps R and r are formed between the raised position U'and the fixed position N'of the manual range M, and between the raised position u and the fixed position n of the automatic range A, respectively. ′ Is wide and the fixed position n of the automatic range A is narrow. The above explanation is
Although the lowering position D of the control lever 20 is set to be semi-automatic corresponding to the lowering d of the automatic range A and the fixed position n of the hydraulic control valve 35, the rectangular hole 30a (play range) of the continuous swing arm 30 is adjusted. Alternatively, the automatic range A may be set to include the lowered position d and the fixed position n as well as the raised position u so as to correspond to (fully) automatic (see FIG. 10D '). Also,
As shown in detail in FIG. 4, a spring 62 is stretched between the control lever 20 and the pin 32a.
Is set so that the tension does not act much in the automatic range A. In addition, as shown in detail in FIG.
The pin 43 planted on the seat abuts on the seat column 25 at the start position (lowering start position) B of the automatic range A, and the movement thereof is restricted by the seat column 25 at the rotation position (manual range) beyond that. The spring 45 by the pin 43 applies tension to the control plate 36 to form a toggle mechanism between the raised position U and the fixed position N, and at the rotational position below that (automatic range A), the pin 32b causes the arm 37 to move. The control plate 36 is controlled by the arm 37 by urging the arm 37 so as to always come into contact with the control plate 36. As a result, in the automatic range A, the control valve 35 rotates smoothly.

In addition, reference numeral 65 in FIG. 1 denotes a sensitivity adjusting lever, which is connected to a sensitivity adjusting device of the float 14 portion of the planting portion 10 through a wire 66, and guides a guide plate 62 as shown in FIG. Along with the groove 62b, it is possible to switch in multiple stages from a high sensitivity (soft field) position H to a low sensitivity (hard field) position L.

Next, the operation of this embodiment based on the above configuration will be described.

When the control lever 20 is in the fixed position N, the pivot support plate 22, the rod
The control plate 36 is also in the fixed position N (range N ') via the 29, the continuous swing arm 30, and the arm 32, the control valve 35 is in the hold state, and the hydraulic cylinder device 19 is held in the same state. The attachment part 10 is in a fixed state. At this time, as shown in FIG. 3, the pin 43 is in contact with the seat column 25, and the pin 32b of the arm 32 is separated from the arm 37 and the spring 45 is stretched.

If the control lever 20 is moved to the raised position U from this state,
The reciprocating arm 30 is moved downward via the pivot plate 22 and the rod 29. Then, the pin 32a is moved downward on the upper wall of the rectangular hole 30a of the arm 30, the arm 32 is rotated counterclockwise against the spring 45, and the control plate 36 is raised via the pin 32b. It rotates to the position U (range U '). As a result, the control valve 35 pumps pressure oil to the hydraulic cylinder device 19 to extend the cylinder and raise the planting part 10.

Further, when the control lever 20 is lowered and operated to the semi-automatic (or automatic) position D, the continuous pulling arm 30 is moved upward, and the pin 32a is moved upward in the lower wall of the rectangular hole 30a of the arm to move the arm 32. Rotate clockwise. Then, the control plate 36 causes the spring 32 to move the pin 32b to the arm 3 via the pin 32b.
It returns until it comes into contact with 7, and rotates to the lowering range D (D ') beyond the fixed range N'. Then, in the state where the float 14 of the planting section 10 is suspended, the continuous check link 42 via the sensing rod 39, the arm 41 and the return spring.
Is pushed to the right and urges the control plate 36 in the lowering direction via the arm 37. Therefore, the control plate 36 is in the automatic lowering position d, and the control valve 35 is the hydraulic cylinder device. Drain the oil in 19 and contract the cylinder,
Move down the planting section. In this state, when the float comes into contact with the farm scene and receives earth pressure from the farm scene and rotates upward,
The movement is linked by the sensing rod 39 and the arm 41.
42. The movement of the link 42 is caused by the arm 37
To the arm 37, the pin 32b of the arm 32 located in the long hole of the control plate 36 comes into contact with the arm 37, and the arm 37 and the control plate 36 rotate integrally based on the spring 45. It becomes a state. And float
When the proper planting position where a suitable earth pressure acts on 14 is reached, the arm 37 and the control plate 36 become the fixed position n or the underlap position r of the automatic range A, the control valve 35 is held, and the hydraulic cylinder device is held. 19 is held in that state, and the planting unit 10 stops at the proper planting position.

In addition, the fixed position N and the raised position U of the control lever 20 described above.
And in the lowered position D, as shown in FIG. 2 and FIG.
The roller 22a of the pivot plate 22 is in contact with the arcuate cam surface 27a of the cam arm 27. Therefore, the cam arm 27 is rotated clockwise, and the arm 54 is connected to the planter via the wire 59 and the spring 57. It is held in the clutch disengaged position.

Then, when the control lever 20 is operated to the automatic position A, the continuous pulling arm 30 moves further upward, and the rotation range of the arm 32 based on the rectangular hole 30a is further shifted in the clockwise direction. Therefore, the rotation range of the control plate 36 that is interlocked with the arm 32 via the pin 32b is defined as the automatic range. In this state, based on the earth pressure acting on the float 14, the sensing rod
The control valve 35 is controlled by a continuous link 42 that moves via the arm 39 and the arm 41. That is, when the planting part 10 is in the proper planting position, the control plate 36 is in the fixed position n or the underlap position r via the arm 37 and the pin 32b.
The control valve 35 is held to hold the planting part 10 in that position. From this state, when the planting part 10 rises above the paddy field and the earth pressure acting on the float 14 decreases, the link 42 moves to the right to rotate the arm 37 counterclockwise, and further the spring 45. As a result of the pin 32b coming into contact with the arm 37 based on the above, the control plate 36 rotates integrally with the arm 37 through the pin 32b to the lowered position d, and the control valve 35 is moved to the oil in the hydraulic cylinder device 19. Is discharged, and the cylinder device is contracted to lower the planting portion 10. On the contrary, when the planting part 10 descends and the earth pressure acting on the float 14 increases, the link 42 moves leftward to rotate the arm 37 clockwise, and further controls the arm 37 integrally. The plate 36 is rotated to the raised position u. As a result, the control valve 35 is switched so as to send the pressure oil to the hydraulic cylinder device 19, and the cylinder device is extended to raise the planting portion 10 to the proper position.
As shown in FIG. 1, the automatic position A of the control lever 20 is
The roller 22a of the pivot plate 22 is moved to the cam arm 2
It disengages from the arcuate cam surface 27a of 7 and engages with the recess 27b. Then, the cam arm 27 rotates counterclockwise to loosen the wire 59, rotate the arm 54 via the spring 57, and engage the planter clutch by actuating the planter clutch.

Then, as shown in FIG. 2, when the rice transplanter 1 reaches the end of the field and depresses either the left or right side clutch pedal 21 to rotate the rice transplanter 1 during the planting work, either one of the clutches is pressed. At the same time, the cam piece 46a or 46b rotates to abut against the roller 49a, and the arm 49 rotates counterclockwise. Further, the rotation of the arm 49 is transmitted to the plate 52 which is integrally rotated with the plate 50 by the fastening component 53 through the plate 50 which is integrated with the arm 49, and the spring is further provided.
The continuous swing arm 30 is moved downward via 56 and the rod 55. As a result, the control lever 20 is rotated to the raised position U against the spring 62 via the rod 29 and the pivot plate 22,
At the same time, as described above, the control plate 36 is rotated to the raised position U to switch the control valve 35 so that the pressure oil is sent to the hydraulic cylinder device 19. As a result, in the rice transplanter 1, the control lever 20 is automatically set to the raised position U when the aircraft is turning,
The planting part 10 rises. At this time, the spring 57 is pulled via the wire 60 by the rotation of the arm 49 based on the depression of the clutch pedal 21, whereby the arm 54 is rotated to disconnect the planter clutch, and the wire 59 is pulled. The counterclockwise urging force acting on the cam arm 27 is released, the roller 27b of the pivot support plate 22 and the recess 27b of the cam arm 27 are disengaged, the control lever 20 is set in the free state, and the control lever by the clutch pedal 21 is released. The return operation of 20 is lightened. Further, since the cam pieces 46a, 46b are configured to rotate the arm 49 with substantially the same operation amount regardless of the pedaling position of the pedal 21, even if the pedaling amount of the pedal 21 is changed, the control plate 36 is excessively moved. It does not act on the control valve 35 to exert an abnormal load.

Then, as shown in FIG. 3, even when the clutch pedal 21 is stepped on, the control lever 20 is rotated by the spring 62.
When it is returned to the fixed position N along the slope a of the guide groove 62a by the control lever 20, the control lever 20 engages with the step portion b of the guide groove 62a and becomes stable, and the continuous swinging arm 30 moves upward and its rectangular shape. The hole 30a is located at a position corresponding to the fixed range N'of the control plate 36, the plate 36 is held at a position slightly beyond the spring 45, and the control valve 35 is held to fix the planting portion 10. Hold in raised position. At this time, the rod
The relative movement between the plate 55 and the plate 55 is absorbed by the spring 56 being compressed.

Further, in order to cancel the linked operation of the hydraulic control by the side clutch pedal 21, the fastening part 53 is attached to the fastening part 50 of the plate 50.
This is done by removing from a and breaking the interlocking of plates 50 and 52.

(G) Effect of the Invention As described above, according to the present invention, the hydraulic control valve is provided.
Since 35 has respective positions U ', N', d, n, u for manual raising, manual fixing, lowering, automatic fixing and automatic raising, optimum hydraulic control can be performed according to each state. That is, in the case of manual control, it is possible to securely hold the working portion (planting portion) with a small leak at the dedicated wide fixed position N ', and in the case of automatic control, the dedicated narrow fixed position n or underlap position. Allows automatic control with good responsiveness at r. Further, the lift control lever 20 can adopt a pattern with extremely high operability, which is composed of each of the manual raising U, manual fixing N, lowering D and automatic A positions, but the hydraulic control valve
The interlocking with 35 is as simple as the interlocking arm 30 having the play mechanism 30a, and the lifting control lever is sufficient.
Even when the 20 is interlocked with the side clutch pedal 21 and the planter clutch 54, the adjustment can be performed easily and accurately, and the reliability and safety can be improved.

Further, when the lowering position D of the lift control lever is configured to be the automatic position including the lowering position d in the automatic range A of the control valve 35 and the semi-automatic lowering position corresponding to the fixed position n or the raising position u, the control valve 35 Can be used for both manual control and automatic control to simplify the structure of the valve 35, and even if the control lever 20 is continuously lowered, if the working part (planting part) 10 reaches an appropriate height, The descent is automatically stopped,
As a result, after turning the headland, the planting work is stopped and the planting work is stopped while the planting work is started and the planting work is started until the planting work is started. It is possible to prevent the roughening of the rice field by smoothing the running.

[Brief description of drawings]

FIG. 1 is an overall side view showing a hydraulic control device according to the present invention,
2 and 3 are side views showing different states thereof, FIG. 4 is a front sectional view thereof, FIG. 5 is a plan sectional view showing an interlocking portion from a side clutch pedal, and FIG. 6 is a hydraulic control. FIG. 7 is a side view showing a valve portion, FIG. 7 is a plan sectional view thereof, FIG. 8 is a plan view showing a guide plate, FIG. 9 is a view showing respective switching positions of a hydraulic control valve, and FIG. FIG. 11 is a view showing the relationship of the opening area, and FIG. 11 is an overall side view showing a riding rice transplanter to which the present invention can be applied. 1 …… Paddy field vehicle (passenger rice transplanter), 5 …… Traveling vehicle, 10
…… Working part (planting part), 19 …… Hydraulic cylinder device, 20…
… Lift control lever, 21… Side clutch pedal, 30…
… Sewing arms, 35 …… hydraulic control valve, 42 …… sewing links, 45 …… planter clutch (arm), U …… manual raising position, N …… manual fixed position, D …… (semi-automatic) lowering position , A: Automatic position (automatic range), M: Manual range,
U '... Manual raising position, N' ... Manual fixed position, d ...
(Automatic) lowered position, n ... automatic fixed position, u ... automatically raised position.

Claims (3)

[Claims] 1. A traveling machine body is provided with a hydraulic cylinder device for lifting and lowering a working unit, and the traveling machine body is provided with a hydraulic control valve for controlling the hydraulic cylinder device, and a lifting control lever for operating the valve. In a paddy work vehicle, the shift pattern of the lifting control lever is configured to have manual raising, manual fixing, lowering, and automatic positions, and the hydraulic control valve is manually raising, manually fixing, lowering, automatic fixing, and automatic fixing. A hydraulic control device for a paddy work vehicle, which has respective raising positions and is arranged such that the manual raising position and the automatic raising position are located at both ends. 2. The hydraulic pressure in the paddy work vehicle according to claim 1, wherein the lowering position in the shift pattern of the lifting control lever is a semi-automatic lowering position corresponding to the lowering position and the automatic fixing position of the hydraulic control valve. Control device. 3. The paddy work vehicle according to claim 1, wherein the lowered position in the shift pattern of the elevation control lever corresponds to a part of the lowered position, the automatic fixing position and the automatic raising position of the hydraulic control valve. Hydraulic control device.