JP2605354Y2 - Moving agricultural machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice transplanting machine having a seedling mounting table and planting claws for continuously performing seedling planting operations.

[0002]

2. Description of the Related Art Conventionally, as shown in Japanese Utility Model Laid-Open Publication No. 61-200774, a hydraulic lift cylinder for raising and lowering a planting portion is provided, a hydraulic pump is driven by an engine, and the lift cylinder is moved by a hydraulic pump via a lift valve. There was a rice transplanter to operate.

[0003]

In the above prior art, the lifting and lowering valve and the steering valve are connected to the hydraulic pump via a flow control valve, so that the lifting and lowering cylinder and the steering cylinder are simultaneously operated by a single hydraulic pump. However, raising and lowering operation and steering operation of the planting section are not performed at the same time, and when a rolling valve and a rolling cylinder that perform horizontal control by tilting the planting section left and right are provided, It is necessary to connect a three-way valve and a rolling valve to a single hydraulic pump using two flow control valves, which simplifies the hydraulic connection structure, reduces costs, and improves handling such as hydraulic pressure adjustment. There is a problem that cannot be solved. Therefore, by connecting the lift valve and the steering valve that do not need to be operated at the same time in series, and connecting the lift valve to the lower side with the steering valve that gives priority to the operation as the superior side, the steering valve and the steering valve can be operated simultaneously. The rolling valve is connected to the hydraulic pump via one flow control valve, which simplifies the hydraulic structure, reduces cost, and improves handling such as hydraulic pressure adjustment. However, the hydraulic pump can be used with the planted part raised. When the planting part is lifted while the machine is stopped, the hydraulic fluid of the lifting cylinder leaks from the rolling valve to the oil tank due to the planting part gravity, and the planting part descends and damages the float etc. There is.

[0004]

According to the present invention, a steering valve and a steering cylinder which are switched by a steering handle, an elevating valve and an elevating cylinder for raising and lowering a planting portion, and rolling for tilting the planting portion from side to side are provided. In a rice transplanter provided with a valve and a rolling cylinder, a steering valve and a rolling valve are hydraulically connected in parallel to a hydraulic pump driven by an engine via a flow control valve, and an elevating valve is hydraulically connected to a lower side of the steering valve. Each of the neutral ports of the lift valve and the rolling valve is short-circuited to the oil tank, and the check valve is used to prevent the hydraulic oil from returning from the lift valve to the steering valve side. Since the lifting valve is connected in series to the lower side as a good side, one hydraulic pump can Resulting connects the steering valve lift valves and rolling valve via the over control valve,
In addition to simplifying the hydraulic structure, reducing costs, and improving the ease of handling such as adjusting the hydraulic pressure, etc., when the engine is stopped with the planted portion raised and lifted, the engine is erroneously raised. Even if the elevating valve is switched to the ascending side, the hydraulic pressure of the elevating cylinder is maintained against the gravitational force of the planting part, which can eliminate the problem that the planting part descends due to oil leakage due to erroneous operation and damages the float etc. is there.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a hydraulic circuit diagram, FIG. 2 is a side view of a riding rice transplanter,
FIG. 3 shows a plan view of the same. In FIG. 3, (1) shows a traveling vehicle on which an operator rides. An engine (2) is mounted on a body frame (3), and a front axle case ( The paddy field traveling front wheel (6) is supported via 5), and a rear axle case (7) is connected to the rear of the transmission case (4), and the paddy field traveling rear wheel (8) is attached to the rear axle case (7). ). Then, a spare seedling mounting table (10) is mounted on both sides of the hood (9) covering the engine (2) and the like, and the step (1) is performed.
The transmission case (4) and the like are covered by a body cover (12) on which an operator rides via 1), and a driver's seat (13) is mounted on the upper part of the body cover (12). Then, a steering handle (14) is provided at the rear of the hood (9).

[0006] In the figure, reference numeral (15) denotes a planting portion provided with a seedling mounting table (16) for six-row planting and a plurality of planting claws (17). Forward tilting seedling platform (1
6) is supported on a planting case (20) via a lower rail (18) and a guide rail (19) so as to be reciprocally slidable right and left, and a rotary case (21) is rotated at a constant speed in one direction. A pair of claw cases (22) and (22) are supported at the case (20) and symmetrically positioned around the rotation axis of the case (21), and the claw case (22) is provided.
(22) Attach the planting claws (17) and (17) to the tip. A support frame (24) is provided on the front side of the planting case (20) via a rolling fulcrum shaft (23), and travels via a link mechanism (27) including a top link (25) and a lower link (26). A support frame (24) is connected to the rear side of the vehicle (1), and a lifting cylinder (28) for raising and lowering the planting section (15) is connected to the lower link (26) via the link mechanism (27). Front and rear wheels (6)
(8) is driven to move and at the same time, a seedling for one plant is planted from the seedling mounting table (16) which is reciprocally slid left and right.
7), the seedlings are continuously planted.

[0007] In the figure, (29) is the main shift lever, (3)
0) is a sub-shift lever for planting elevating and working travel shifting, and (3)
1) is a planting sensitivity adjusting lever, (32) is a main clutch pedal, (33) and (33) are left and right brake pedals, (3)
4) is a center float for two-row equalization, (35) is a side float for two-row equalization, and (36) is a side fertilizer.

4 and 5, the engine (2) is connected to a pair of left and right body frames (3) via an engine mount (37).
The steering shaft (39) of the steering handle (14) to be mounted on the (3) and inserted into the cylindrical body (38) is erected on the upper surface of the reduction case (40), and the steering shaft (39) is located in front of the reduction case (40). A hydraulic steering cylinder (4) for fixing the rear side of the body frame (3) with bolts, and connected to the front axle case (5) via a steering rod (41).
2) is provided below the engine (2).

Further, a pair of left and right main frames (43) and (43) front ends are bolted and fixed to both sides of a rear portion of the deceleration case (40), and cover frames (44) and (45) for supporting a foot portion of the vehicle body cover (12). ) To the mainframe (4
3) The front axle case (5) is swingably mounted on the front lower surface of the main frame (43) while being welded and fixed to the front upper surface, and the left and right front wheels (6) (6) are installed on both sides of the axle case (5). Let me.

The rear end of the main frame (43) is fixed to the rear axle case (7) by bolts, and the transmission case (4) at the front of the case (7) is fixed to the main frame (43). , Each link (25)
A gate-shaped support (46) provided with (26) is erected at the rear of the main frame (43), and a pair of left and right upper frames (47) (4) is provided between the front of the frame (43) and the support (46).
7), the lifting cylinder (28) is attached to the middle part of the upper frame (47), and the lower link (26) is swung up and down by the lifting cylinder (28).
5) is configured to be moved up and down.

Further, as shown in FIGS. 4, 5, and 6, an engine (2) is provided with a belt continuously variable transmission mechanism (51) having input / output pulleys (48) (49) and a belt (50).
The input shaft (5) of the deceleration case (40) is connected to the output shaft (52) of the
3) is connected via the continuously variable transmission mechanism (51), and the transmission case (4) is connected via the output shaft (54) to the deceleration case (40) to connect the forward drive shaft (55). A front axle case (5) is connected to the transmission case (4) via a transmission, and a planting case (20) is connected to the transmission case (4) via a planting drive shaft (56). (51) and the speed reduction transmission of the engine (2) to the transmission case (4) via the deceleration case (40), and the multi-speed transmission output from the main transmission lever (29) of the transmission case (4) is transmitted to the front and rear wheels (6). ) And (8) through the respective axle cases (5) and (7).

A tension roller (57) for tensioning the belt (63) and pulleys (48) and (49).
Input / output cams (58) and (59) for changing the winding diameter of the belt (50), a connecting rod (60) for interlocking and connecting the cams (58) and (59), and a connecting rod (60). Cam (5
8) Potentiometer (6) for detecting the displacement of (59)
1) and a speed change link (63) rotatably supported via a shaft (62) outside the left main frame (43), and one end of the link (63) and a connecting rod (60) are connected to a speed change rod (60). 64), the other end of the link (63) is connected to the telescopic output shaft (66) of the transmission motor (65), and the motor (65) is mounted on the bracket (67) of the left main frame (43). The motor (6)
The input / output cams (58) and (59) are rotated via the link (63) and the like by the forward / reverse control of 5), and the winding diameter of the belt (50) is changed by changing the width of the input / output pulleys (48 and 49). And the speed ratio of the pulleys (48) and (49) and the belt (50) is continuously changed.

Further, as shown in FIGS. 1 and 8, a rolling cylinder (68) for tilting the planting portion (15) right and left about the rolling fulcrum shaft (23), and a hydraulic pump driven by the engine (2). (69), the transmission case (4) is used as a hydraulic oil tank, and the pressure oil discharge side of the hydraulic pump (69) is branched into a high-pressure oil passage (70) and a low-pressure oil passage (71). Flow control valve (72) and steering handle (14)
A steering valve unit (74) provided with a steering valve (73) switched by a sub-shift lever, a lifting valve unit (76) provided with a lifting valve (75) switched by an auxiliary transmission lever (30), and a rolling provided with a rolling valve (77). And a valve unit (78).

The steering and elevating valves (73) and (75) are connected in series to a hydraulic pump (69) through a high-pressure oil passage (70) of the flow control valve (72), and the steering valve (73) is connected. ) Is provided on the more upstream side than the lifting / lowering valve (75), and the rolling valve (77) is connected to the hydraulic pump (69) via the low-pressure oil passage (71) of the flow control valve (72). A steering cylinder (42) and a lifting / lowering cylinder (28), which are planting operation hydraulic devices for performing planting and lowering, etc., and a planting section (1
5) Rolling cylinder (6) for controlling the left-right inclination posture
8) is driven by the hydraulic pump (69). The rolling valve (77) is switched by a leftward and rightwardly tilting solenoid (79) (80) to operate a rolling cylinder (68) and a flow control valve (72). ), A return valve (75), and a return valve of a plurality of hydraulic devices such as a rolling valve (77) are returned to the transmission case (4).

The traveling vehicle (1) is provided with a lifting cylinder (2).
8) A hydraulic device in which a planting section (15) as a working machine is provided so as to be able to move up and down via 8), and a lifting pump (75) is connected to a hydraulic pump (69) via a flow control valve (72). High-pressure oil passage (70) between flow control valve (72) and elevating valve (75)
A check valve (81) is provided to prevent flow of hydraulic oil from the lift valve (75) toward the flow control valve (72) by the check valve (81). When the engine (2) stops, the lift valve (75) is provided. ) Is switched to the ascending position, the elevating valve (75), the steering valve (73),
The check valve (81) prevents the hydraulic oil of the lifting cylinder (28) from returning to the transmission case (4), which is an oil tank, via the flow control valve (72) and the rolling valve (77). (2)
Even if the raising / lowering valve (75) at the time of stoppage is erroneously operated, the raising / lowering cylinder (28) is held at the raising position, preventing damage to the floats (34) and (35) due to the lowering of the planting portion (15). The configuration is such that malfunction of the rolling cylinder (68) due to return oil from the lifting cylinder (28) can be prevented.

As is apparent from the above description, the steering valve (73) and the steering cylinder (42) which are switched by the steering handle (14), and the elevating valve (75) and the elevating cylinder for raising and lowering the planting portion (15). (28) and a hydraulic pump (6) driven by the engine (2) in a rice transplanter provided with a rolling valve (77) and a rolling cylinder (68) for tilting the planting section (15) from side to side.
9) The steering valve (73) and the rolling valve (77) are hydraulically connected in parallel via the flow control valve (72), and the lifting / lowering valve (75) is hydraulically connected to the lower side of the steering valve (73). Then, the neutral ports of the lift valve (75) and the rolling valve (77) are short-circuited to the transmission case (4), which is an oil tank, respectively, and the hydraulic oil returns from the lift valve (75) to the steering valve (73). Is prevented by the check valve (81). Then, the lift valve (75) is connected in series to the lower side with the steering valve (73) to be operated preferentially on the upper side, and the single hydraulic pump (69) is steered via one flow control valve (72). The valve (73), the elevating valve (75) and the rolling valve (77) are connected to simplify the hydraulic structure, reduce the cost, improve the handleability such as hydraulic pressure adjustment, etc., and raise the planting part (15). When the engine (2) is stopped in the state of being lifted and lifted, even if the lift valve (75) is erroneously moved upward and the lift valve (75) is switched to the lifting side, the lift cylinder ( 28)
Is maintained so that the planting part (15) descends due to an oil leak due to an erroneous operation and damages the floats (34), (35) and the like are eliminated.

As shown in FIG. 8, a hydraulic pump (6
9) Hydraulic devices such as a steering valve (73), an elevating valve (75), and a rolling valve (77) are arranged on a substantially straight line in the front-rear direction on the right side of the fuselage front-rear center line (A), and each hydraulic device is connected. The hydraulic pipe (82) extends to the right side of the traveling vehicle (1), and hydraulic equipment such as a hydraulic pump (69) and valves (73) (75) (77) and the hydraulic pipe (82) are connected to the right side of the machine body. , Hydraulic maintenance can be performed satisfactorily from the right side of the aircraft, and hydraulic piping (8
2) can be performed linearly to reduce damage, shorten the length of the hydraulic pipe (82) to reduce weight and reduce the amount of required hydraulic oil, etc., and continuously variable transmission on the left side of the traveling vehicle (1). Mechanism (51), transmission rod (64), transmission motor (4
5) The continuously variable transmission device such as 5) can be simply arranged, and the hydraulic device and the hydraulic piping (82) and the continuously variable transmission device are mounted on the traveling vehicle (1).
The structure is such that the structure of the traveling vehicle (1) can be easily simplified by distributing it to the left and right sides of the vehicle, and the assembling and maintenance of the continuously variable transmission device can also be favorably performed.

[0018]

As is apparent from the above embodiments, the present invention provides a steering valve (73) and a steering cylinder (42) which can be switched by a steering handle (14), and a planting section (15).
Valve (75) and cylinder (2)
8) and a flow control valve (72) for a hydraulic pump (69) driven by the engine (2) in a rice transplanter provided with a rolling valve (77) and a rolling cylinder (68) for tilting the planting section (15) from side to side. Via a steering valve (73) and a rolling valve (77)
Are connected in parallel to each other, and a lifting valve (75) is hydraulically connected to the lower side of the steering valve (73). Each neutral port of the lifting valve (75) and the rolling valve (77) is connected to the oil tank (4). Short each, lift valve (75)
Check that hydraulic oil returns to the steering valve (73) side from
Since the steering valve (73) to be operated preferentially is set to the upstream side and the lift valve (75) is connected in series to the downstream side, one single hydraulic pump (69) is connected to a single hydraulic pump (69). Flow control valves (7
2) Steering valve (73) and lifting valve (75) via
And the rolling valve (77) can be connected to simplify the hydraulic structure, reduce the cost, and improve the ease of handling such as adjusting the hydraulic pressure.
When the engine (2) is stopped in a state where it is lifted and lifted, it is erroneously raised and the lift valve (75) is lifted.
Is switched to the ascending side, the hydraulic pressure of the raising / lowering cylinder (28) is maintained against the gravity of the planting part (15), and the planting part (15) descends due to oil leakage due to erroneous operation, and the float (34) (35) It is possible to eliminate the problem of damaging the device.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram.

FIG. 2 is a side view of the riding rice transplanter.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view of the traveling vehicle body.

FIG. 5 is a plan view of the same.

FIG. 6 is a side view of the belt continuously variable transmission mechanism.

FIG. 7 is a plan view of a front portion of a traveling vehicle body.

FIG. 8 is an explanatory diagram of a hydraulic device arrangement.

[Explanation of symbols]

 (2) Engine (4) Transmission case (oil tank) (14) Steering handle (15) Planting part (28) Lifting cylinder (42) Steering cylinder (68) Rolling cylinder (69) Hydraulic pump (72) Flow Control valve (73) Steering valve (75) Elevating valve (77) Rolling valve (81) Check valve

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 49/00 A01C 11/02 311

Claims (1)

(57) [Scope of request for utility model registration] 1. A steering valve (73) and a steering cylinder (42) switched by a steering handle (14), a lifting valve (75) and a lifting cylinder (28) for lifting and lowering the planting part (15), A rolling valve (77) for tilting the planting part (15) from side to side and a rolling cylinder (6)
In the rice transplanter provided with 8), the steering valve (73) and the rolling valve (77) are hydraulically connected in parallel to the hydraulic pump (69) driven by the engine (2) via the flow control valve (72), and The lifting valve (75) is hydraulically connected to the lower side of the steering valve (73), and the lifting valve (75) and the rolling valve (77) are connected.
Each of the neutral ports is short-circuited to the oil tank (4), and the check valve (81) prevents the hydraulic oil from returning from the elevating valve (75) to the steering valve (73). Rice transplanter.