JPH089728A - Rice transplanter - Google Patents

Abstract

PURPOSE:To adequately maintain ground pressure of a rolling sensor even if a machine body is lifted or lowered by control of planting depth and readily carry out improvement of a function for controlling rolling hydraulic changeover valve due to lateral rolling sensors. CONSTITUTION:In a rice transplanter having grounding type lateral rolling sensors (22) and (22) on lateral both sides of the machine body, these lateral rolling sensors (22) and (22) are mutually independently liftably attached and differential output mechanisms (46) and (47) for changing over a rolling hydraulic changeover valve by the difference in either one lifting or lowering motion of each rolling sensor (22) and (22), the difference in lifting or lowering motion in the mutually opposite direction and the difference in motion amount in the same direction in simultaneously lifting or lowering each rolling sensor (22) and (22) are formed and the rolling hydraulic changeover valve is operated when either one of lateral rolling sensors (22) and (22) is kept in stopped state and the other is lifted or lowered or when each lifting or lowering motion amount in the lateral opposite direction and the lateral same direction differs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice transplanter having, for example, a vertical hydraulic cylinder for raising and lowering a rice transplanter and a horizontal hydraulic cylinder for tilting the rice transplanter to the right and left.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Unexamined Patent Publication No. 52-131823, there has been a technique of horizontally supporting a rice transplanter with respect to a planted rice field by detecting a lateral inclination of the rice transplanter with a pair of left and right rolling sensors.

[0003]

In the above-mentioned prior art, since the left and right rolling sensors are integrally connected, the ground pressure of the rolling sensor changes due to the raising and lowering of the machine body, and the left and right inclinations cannot be detected properly. There was a functional problem with. In addition, when the left and right rolling sensors are mounted independently of each other so that they can be raised and lowered independently, and the left and right rolling sensors are connected to the swing arm that switches the rolling oil pressure switching valve via the left and right sensor wires that extend in opposite directions. , There is a problem that the length of looseness of the sensor wire changes and the detection sensitivity is changed by adjusting the planting depth of the seedling, and one of the left and right rolling sensors rises or falls while the other is kept at a predetermined height. At this time, or when there is a difference in the ascending amount (or descending amount) of both rolling sensors, there is a problem in that one sensor wire is only loosened and the lateral inclination of the machine body cannot be properly detected.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, in a rice transplanter in which grounding left and right rolling sensors are provided on both left and right sides of the machine body, the left and right rolling sensors are independently attached to each other so as to be vertically movable, and each rolling is performed. Differential output that switches the rolling hydraulic pressure switching valve depending on the rising or lowering operation of one of the sensors, the raising and lowering operations of the rolling sensors in the opposite directions, and the difference in the operating amount in the same direction when both rolling sensors move up or down. A mechanism is provided, and one of the left and right rolling sensors is configured to operate the rolling hydraulic switching valve based on the stop state and the difference in the left and right movement directions in the opposite direction and the same direction in the left and right directions. Even if the rolling sensor ground pressure can be maintained properly, only one rolling sensor Easy to tilt the aircraft via the differential output mechanism when there is a difference in the amount of ascent (or descent) when ascending (or descending) or when both rolling sensors are ascending (or descending) together. Therefore, it is possible to easily improve the control function of the rolling hydraulic pressure switching valve by the left and right rolling sensors.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view of main parts, FIG. 2 is a side view of a walk-behind rice transplanter, and FIG. 3 is a plan view of the same, where (1) is an engine,
(2) is a transmission case, (3) is a planting case connected to the transmission case (2) via a transmission case (4), and (5) is the engine (1) and each case (2).
(3) A bonnet covering the upper side of the rice transplanting machine constituted by (4), (6) is a spare seedling mounting table provided on the rear upper surface of the bonnet (5), and (7) is connected to the planting case (3). A steering handle, (8) is a low-back and high-high seedling mounting table which is slidably reciprocally slidable left and right via guide rails (9) and (10) above the handle (7), and (11) is the planting plant. A transverse feed shaft attached to the attached case (3) to drive the seedling table (8) in a lateral direction, and (12) is attached to the planting case (3) via a planting arm (13) to mount the seedling platform (8). (8) a pair of right and left paddy wheels that are supported on the mission case (2) so as to be able to move up and down via a swing case (15); Put left and right swing rods (17) and (17) on the swing cases (15) and (15). And left and right and connected to the paddy field wheel (1
4) A vertical hydraulic cylinder for vertically moving the rice transplanter by controlling (14) to move in and out, and (18) is the engine (1).
And in each case (2) (3) (4) lower front link (1
9) and a leveling float for planting rice field leveling which is supported via a planting depth lever (20), and (21) is the planting claw (1)
2) A pitching sensor for detecting the elevation of the front part of the float (18) due to a change in the planting depth of the seedling, and (22) are arranged behind the paddy wheel (14) on both sides of the rear part of the float (18). This is a flat sled plate type rolling sensor that detects the inclination of the rice transplanter in the left-right direction and smooths the road (erasing the wheel marks).

As shown in FIGS. 4 and 5, the engine (1) is connected to and supported by the transmission case (2) through the body frame (23), and the vertical hydraulic cylinder ( 16) is attached, and the middle of the pitching adjusting cylinder shaft (25) is connected and fixed to the tip of the piston rod (24) of the cylinder (16). Then, the middle of the rolling adjustment shaft (26) is rotatably inserted into the cylindrical shaft (25), and the push and pull directions of the left and right swing rods (17) (17) are reversed by the rotation of the rolling adjustment shaft (26). So that the arm (2
7) Each swing rod (17) (1) through (27)
7) A horizontal hydraulic cylinder (28) that connects the tip and corrects the right and left inclination of the rice transplanting machine to keep it approximately horizontal,
The cylinder (28) is attached to the cylinder shaft (25) via a bracket (29), and the piston rod (30) of the cylinder (28) is connected to the rolling adjustment shaft (26) via an arm (31). Under the control of the vertical hydraulic cylinder (16), the shafts (25) and (26) are slidably displaced in the longitudinal direction of the machine body, and the left and right swing rods (1
7) Pushing and pulling (17) in the same direction to raise and lower the rice transplanting machine, keeping the seedling planting depth substantially constant, and rotating the rolling adjustment shaft (26) by controlling the horizontal hydraulic cylinder (28). The left and right swing rods (17) and (17) are pushed and pulled in different directions so that the support heights of the left and right wheels (14) and (14) are different, and the rice transplanter is supported substantially horizontally.

Further, a hydraulic unit case (34) for driving and controlling the vertical hydraulic cylinder (16) is provided, and the unit case (34) is connected to the transmission case (2).
The pitching sensor (21) is connected to the unit case (34) via a connecting rod (35) and links (36) (37) that are fixed to one side of the unit and reduced by a pressing force greater than or equal to a set value. While the pitching sensor (21) detects the vertical movement of the front of the leveling float (18), the vertical hydraulic cylinder (16) is automatically operated,
The pitching sensor (21) is attached to a lifting lever (38) provided on the steering handle (7) via an arm (39).
And the up-and-down hydraulic cylinder (16) is operated by the manual operation of the elevating lever (38).

Next, as shown in FIG. 6, there is provided a rolling sensor arm (41) which sets a lowering lowermost position by a lowering regulation stopper (40), and the left and right rolling sensor arms (41) (41) are provided with right and left rear ends. The rolling sensors (22) (22) are connected and fixed respectively, and the front ends of the left and right rolling sensor arms (41) (41) are independently provided to the bearing body (42) provided on the upper rear side of the transmission case (4). Support rotatably. Also, a rolling hydraulic switching valve (4) for controlling the operation of the horizontal hydraulic cylinder (28).
3), and the switching valve (43) is fixedly mounted on the rear upper side of the transmission case (2) via a base frame (44), and is connected to the base frame (44) via a rolling fulcrum shaft (45). To support the middle of the receiving cylinder (46), swinging the receiving cylinder (46) laterally in the lateral direction of the machine body, and having both ends of a core shaft (47) rotatably inserted in the receiving cylinder (46). A link (4) having a base end fixed to the input link (48) (48) and integrally connected to the rolling sensor arm (41).
9) and the input link (48) are connected by a rod (50), and each member (22) (41) (46) (47)
(48) (49) is formed symmetrically about the fulcrum shaft (45), and a ground holding spring (51) is stretched between the arm (49) and the planting case (3). When the left and right rolling sensors (22) and (22) are brought into pressure contact with the planting surface by springs (51) and (51) provided symmetrically, the left and right rolling sensors (22) move up and down in the same direction at substantially the same time. Input link (48)
(48) swings around the core shaft (47) to hold the rolling hydraulic pressure switching valve (43) in a neutral position, while the left and right rolling sensors (22) and (22) move in different directions or only one of them moves up and down. Left and right links (49)
Rolling fulcrum shaft (45) due to the difference in the swing amount of (49)
, The receiving cylinder (46) is swung, and the rolling hydraulic switching valve (43) is operated to drive and control the horizontal hydraulic cylinder (28).

As is clear from the above, in the rice transplanter in which the grounding type left and right rolling sensors (22) (22) are provided on the left and right sides of the machine body, the left and right rolling sensors (22)
(22) are mounted independently of each other so as to be able to freely move up and down, and one of the rolling sensors (22) and (22) is moved up or down, and each rolling sensor (2).
2) A differential output for switching the rolling hydraulic pressure switching valve (43) by the raising / lowering operation of the (22) in opposite directions and the difference in the operating amount in the same direction when the rolling sensors (22) and (22) both rise or descend. A mechanism (4
6) and the core shaft (47), one of the left and right rolling sensors (22, 22) is stopped, and the rolling hydraulic pressure switching valve (43) is operated based on the difference between the vertical movements in the left and right directions and the left and right directions. It is configured to operate.

The lowering stopper (40) is formed in a U-shape, and the U-shape of the stopper (40) is formed via a bracket (53) on the lower surface of a seedling extraction plate (52) supporting the guide rail (9). Both ends are fixed and the stopper (4
0) through which the middle of the rolling sensor arm (41) is vertically movable, and the lowering of the rolling sensor arm (41) is restricted by a stopper (40), so that the pair of left and right rolling sensors (22) is attached to a planted case ( 3) The bearing bodies (42) are independently movably supported on the rear sides of the rear side, and the bearing bodies (42) are fixed to the upper side of the transmission case (4) via the bracket (54). Planted case (3)
A bearing body (42) is provided on the front side to extend the sensor arm (41) substantially parallel to the transmission case (4), and the lower surface of the rolling sensor (22) is provided with a flat float (1).
8) The spring (5
1) The sensor arm (41) which is held downward by 1) is restricted by the stopper (40) so as to descend, and the stopper (40) prevents the sensor arm (41) from swinging to the left and right, thereby allowing the rolling sensor (22) to move to the left and right. It is configured to regulate movement.

As shown in FIGS. 1 and 6, a lower end of the spool arm (55) of the rolling hydraulic pressure switching valve (43) and an intermediate portion of the receiving cylinder (46) are connected by a rod (56) to form a rolling fulcrum shaft (45). ), The swing of the receiving cylinder (46) is interlocked via the rod (56) to swing the spool (57) of the switching valve (43) by the swing of the spool arm (55), While the switching valve (43) is operated, a rolling lock mechanism (58) is provided in the switching valve (43) to stop the operation of the switching valve (43). The rolling lock mechanism (58) is provided as close as possible to the spool (57) which is the detection rotation shaft.

The rolling lock mechanism (58) includes a rolling lock plate (60) having a sector notch (59).
And a rolling lock lever (61) for vertically operating the lock plate (60), and a lower end of a rolling rod (63) inserted vertically into the fixed cylinder (62) so as to be movable up and down. , Its rolling rod (6
3) The fixing pin (64) at the upper end is locked in the sliding groove (65) at the tip of the lever (61), and the lock plate (60) and the lock lever (61) are interlockingly connected to each other. When controlling, the arc surface (59) above the notch (59) is used.
The lock plate (60) is suspended and supported so that (a) is located above the locking pin (66) fixed to the upper end of the spool arm (55) of the switching valve (43), and the arc surface (59) is supported.
a) On the inner side, the locking pin (66) is rocked together with the spool arm (55) to rotate the spool (55) to operate the switching valve (43), while the rice transplanter is tilted by horizontal control. When it is inconvenient, the lever (61) is swung around the fulcrum shaft (68) against the return spring (67) to pull up the lock plate (60), and sliding surfaces ( 59c) (59c) through the notch (5
9) The locking pin (66) is engaged with the lower locking groove (59d), and the spool arm (55) is forcibly held in a vertical state to prevent the rotation of the spool (57). The switching valve (43) is held at a neutral position.

Further, a lever support plate (61a) for locking the lever (61) in multiple stages is provided.
1) The operation amount of the lock plate (60) is adjusted so as to adjust the operation amount of the lock plate (60), and the locking amount of the locking pin (59) in the fan-shaped notch (59) accompanying the swing of the spool arm (55) is adjusted. 6
It is configured to regulate the swing range of 6).

The locking lever (61) shown in FIG. 2 is connected to the locking lever (61) via a wire (69).
0) are connected, and the switching valve (43) is held in the neutral position via the rolling lock mechanism (58) by the operation of disengaging the lever (70) to disengage the clutch. The rolling lock mechanism is released by operating the clutch to operate the switching valve (43).

As shown in FIG. 7, the upper and lower hydraulic cylinders (1
6) and a hydraulic pump (71) for pumping hydraulic oil in the transmission case (2) to the horizontal hydraulic cylinder (28);
A flow divider (74) for supplying pressure oil from a hydraulic pump (71) necessary for each of the vertical and horizontal hydraulic cylinders (16) (28) via two throttle valves (72) (73). A pitching hydraulic switching valve (75) for controlling the operation of the vertical hydraulic cylinder (16); and setting between the hydraulic divider valves (43) and (75) for rolling and pitching and the flow divider (74). Each of the pitching and rolling relief valves (76) (77) for short-circuiting the discharge side of the flow divider (74) into the transmission case (2) due to the increase of the circuit hydraulic pressure is provided in the hydraulic unit case (34). Is to be installed internally,
The high pressure oil of the optimum oil amount set by the throttle valves (72) (73) of the flow divider (74) is supplied to each switching valve (75) (4).
3) applied to each cylinder (16) (28) via
The pitching hydraulic switching valve (75) is operated by the pitching sensor (21) and the lifting lever (38) to control the operation of the vertical hydraulic cylinder (16), and the rolling hydraulic switching valve (4) is controlled by the rolling sensors (22) and (22).
Pilot check capable of reliably sealing against high pressure between the rolling hydraulic pressure switching valve (43) and the horizontal hydraulic cylinder (28) while operating 3) to control the operation of the horizontal hydraulic cylinder (28). Valve (78) (7
9) is incorporated, and when the rolling hydraulic switching valve (43) is held at the neutral position by the rolling lock mechanism (58), oil leakage at the neutral position is prevented and the locking is surely performed.

As shown in FIGS. 8 and 9, a drive belt (82) for transmitting the output of the hydraulic hoses (80) (81) for rolling control from the engine (1) to the mission (2), and the belt (82). ) Belt cover (8
3) and is arranged so as to protect the hoses (80) and (81) from muddy water and obstacles.

As shown in FIG. 6, the left and right links (4
9) The spring (51) is pressed against (49) from above.
Left and right rolling sensors (22) (2) against (51)
2) Rolling control regulation arm (8) that lifts and supports
4) and a bracket (8) on the upper side of the transmission case (4).
5) through which the regulating arm (84) is swingably supported in the vertical direction, and the rolling control regulating arm (84) is connected with the lock lever (61) through a wire (86). The left and right rolling sensors are moved by moving the regulating arm (84) upwards in conjunction with the operation of the hydraulic pressure switching valve (43) of the lever (61) to separate the arm (84) from the left and right links (49, 49). (22) A regulating arm (84) that supports (22) so as to be able to move up and down and is interlocked with a locking operation of the hydraulic pressure switching valve (43) of the lever (61).
And move the arm (84) downward to move the left and right links (49).
The left and right rolling sensors (22) are brought into pressure contact with (49).
(22) is configured to be lifted and supported at a position higher than the leveling float (18).

This embodiment is constructed as described above, and the seedling placing table (8) is reciprocally moved to the left and right, and the seedlings for one strain are sequentially obtained from the seedling placing table (8) by the planting claws (12). It is taken out and planted. By operating the lifting lever (38), the up-and-down hydraulic cylinder (16) is operated to raise and lower the rice planting machine to change the direction at the ridge, and to change the unevenness of the tiller. By raising and lowering the front part of the flat float (18),
The pitching sensor (21) moves up and down to operate the vertical hydraulic cylinder (16), and the seedling mounting table (8) and the planting claw (12)
The planting section provided with such a means moves up and down to keep the contact pressure of the leveling float (18) substantially constant and the planting depth of the planting section to keep the planting depth of the planting claws (12) substantially constant. Let it happen automatically. Moreover, the rolling sensor (22) (22) on the left and right can be obtained by tilting the rice transplanter body to the left or right due to the unevenness of the tiller.
Is moved up and down in different directions or only one of them, the horizontal hydraulic cylinder (28) is operated, and the planting section including the seedling mounting table (8) and the planting claw (12) is tilted left and right. The horizontal control of the planting section for keeping the rice transplanting machine substantially horizontal with respect to the planting rice field is automatically performed.

During the horizontal control of the rice transplanter as described above, the lock lever (61) is set in the horizontal state as shown by the solid line in FIG.
6) hangs and supports the lock plate (60) swingably on the inner side of the arc surface (59a), and the rolling sensor (22)
The spool arm (55) is set to the free state so as to be linked with the operation of detecting the unevenness of the tiller by (22), and the rolling hydraulic pressure switching valve (43) is operated by the rotation of the spool (57) based on the detection operation signal. Then, the horizontal hydraulic cylinder (28) is automatically controlled.

When it is inconvenient to incline the rice transplanting machine by horizontal control, such as when the rice transplanting machine is turned upside down by raising the rice transplanting machine and when traveling on a road, as shown by a virtual line in FIG.
When the lock lever (61) is lowered and the lock plate (60) is pulled up, when the spool arm (55) is in the vertical state, that is, when the switching valve (43) is in the neutral position, the locking pin (6) remains as it is.
6) is engaged with the locking groove (59b), and when the spool arm (55) is in an inclined state, that is, when the switching valve (43) is at a position other than the neutral position, the sliding surface (59c) on one side is attached to the sliding surface (59c). Slide the lock pin (66) into contact with the spool arm (5
5) Put the locking pin (66) in the locking groove (5
9b) to forcibly hold the rolling oil pressure switching valve (43) in the neutral position, and even if the rolling sensor (22) collides with the centrifugal force at the time of turning or an obstacle, a tilt detecting operation is performed. Even if it goes, the rolling lock mechanism (58) blocks the rotation of the spool (57) to block the operation of the rolling hydraulic switching valve (43), and restricts the operation of the horizontal hydraulic cylinder (28) to control the rice transplanter body. The horizontal control of can be stopped.

The above-mentioned horizontal control stop operation can also be performed by the planted clutch lever (70).
Automatically turns the rolling lock mechanism (5
8) is operated to prevent forgetting to operate the lock mechanism (58), and the operation can be simplified to improve the work efficiency of seedling planting compared to the conventional case.

[0022]

As is apparent from the above embodiments, the present invention is a rice transplanter in which grounding type left and right rolling sensors (22) (22) are provided on the left and right sides of the machine body. The rolling sensors (22) (2
2) ascending or descending operation, and ascending and descending operations of the rolling sensors (22) and (22) in opposite directions, and the same direction operation when the rolling sensors (22) and (22) both ascend or descend. A differential output mechanism (46) (47) for switching the rolling hydraulic pressure switching valve (43) according to the difference in amount is provided, and the left and right rolling sensors (2
2) One of (22) is configured to operate the rolling hydraulic pressure switching valve (43) based on the difference between the vertical movement amount in the stopped state and the left-right opposite direction and the left-right same direction. The rolling sensor ground pressure can be properly maintained even if the rolling sensor is moved up and down, and when only one rolling sensor (22) is raised (or lowered), or both rolling sensors (22) and (22) are both raised (or lowered). When there is a difference in the amount of ascent (or amount of descent) at this time, the tilt of the airframe can be easily detected via the differential output mechanism (46) (47), and the rolling by the left and right rolling sensors (22) (22) is performed. Hydraulic switching valve (43)
The control function can be easily improved.

[Brief description of drawings]

FIG. 1 is an enlarged explanatory view of a main part.

FIG. 2 is an overall side view.

FIG. 3 is a plan view of the same.

FIG. 4 is a partially enlarged plan view.

FIG. 5 is a side view of the same.

FIG. 6 is a rear view of the same.

FIG. 7 is a hydraulic circuit diagram.

FIG. 8 is a partial side view.

FIG. 9 is a plan view of the same.

[Explanation of symbols]

 (22) Rolling sensor (43) Rolling hydraulic pressure switching valve (46) Receptacle (differential output mechanism) (47) Core shaft (differential output mechanism)

Front page continuation (72) Inventor Hiroyuki Takahashi 1-32 Chayamachi, Kita-ku, Osaka Yanmar Agricultural Machinery Co., Ltd.

Claims (1)

[Claims] 1. In a rice transplanter in which grounding left and right rolling sensors (22) (22) are provided on both left and right sides of the airframe, the left and right rolling sensors (22) (22) are independently attached to each other so as to be vertically movable, and Each rolling sensor (2
2) Ascending or descending operation of either one of (22) and ascending and descending operation of each rolling sensor (22) (22) and each rolling sensor (22) (22)
A differential output mechanism (46) (47) for switching the rolling oil pressure switching valve (43) is provided by the difference in the amount of movement in the same direction when both rise and fall, and one of the left and right rolling sensors (22) (22) stops. A rice transplanter characterized in that the rolling hydraulic switching valve (43) is operated based on the state and the difference between the right and left opposite directions and the left and right same directions.