JPH0773449B2 - Rice transplanter lifting device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lifting device for a rice transplanter in which a planting part is installed in a traveling vehicle so as to be lifted and lowered via a link mechanism.

"Prior Art" Conventionally, as shown in Japanese Patent Publication No. 58-15081, when the raising / lowering lever is switched to the raised position to raise the planting part, the raising / lowering lever of the planting part returns the raising / lowering lever to the neutral position. There was technology.

[Problems to be Solved by the Invention] In the above-mentioned conventional technique, the lift arm is connected to the elevating lever by a rod having a stopper, and when the lift arm hits the stopper, the elevating lever is returned to the neutral position. There is a problem that oil supply to the lifting hydraulic cylinder is stopped at the switching transition position of the switching valve, and it is easy to support the lifting lever without returning safely to the neutral position, and the lifting lever moves from the neutral position to the descending side. However, there is a problem in that, for example, a spring for holding the elevating lever on the ascending or descending side by a fulcrum crossing action cannot be easily attached, and the operation of the elevating lever cannot be simplified.

"Means for Solving the Problem" However, the present invention relates to a lifting device for a rice transplanter that holds an elevating lever for elevating and lowering a planting part at a rising position by a spring, and neutralizes the elevating lever against the spring force. A lifting spring for returning to the position is provided, and a wire pulled by the raising operation of the lifting hydraulic cylinder and the end portion of the restoring spring are connected to a pressure lever, and the pressure lever is rotatably provided. The pressure lever is brought into contact with the receiving lever integrally fixed to, and the tension lever is rotated by the rotation of the pressure lever in the neutral return direction.
It is characterized in that the receiving lever and the pressure lever are arranged relatively at a position where the restoring spring force acting on the receiving lever via the pressure lever increases.

"Working" Therefore, the rise of the planting part is detected by the wire and the receiving and pressing lever, and the restoring spring acts as the lifting lever neutral return force, and the lifting lever that is held in the raised position by the spring restores the restoring spring force. Since it is returned to the neutral position by means of the spring, the action of crossing the fulcrum of the spring can be used to easily simplify the operation of the lifting lever, and the restoring spring can always return the lifting lever to the neutral position at all times, and the hydraulic pressure of the lifting hydraulic cylinder can be adjusted. It is possible to eliminate the conventional problems such as the switching valve being held at the switching transition position, and to easily obtain a stable lifting / lowering switching operation by a simpler lifting / lowering lever operation compared to the conventional one.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view of a main part, FIG. 2 is an overall side view of a riding rice transplanter, FIG. 3 is an overall plan view of the same, FIG. 4 is a partial rear view of the same, and FIG. 5 is a partial side view of the same. In the figure, (1) is a traveling vehicle on which an operator rides, the engine (2) is mounted on a base frame (3), and the engine (2) is mounted on the hood (4).
And a miss case (5) at the rear end of the base frame (3) and the miss case (5).
The transmission cases (6) are integrally connected to the left and right sides of the rear end. Left and right paddy field front wheels (8) on the left and right sides of the front of the mission case (5) via axle frames (7), and left and right paddy field rear wheels on the outside of the rear of each transmission case (6). (9) are respectively supported, and a driver's seat (10) on which a worker sits is mounted above the transmission case (6) via the driving frame (11). In addition, a spare seedling stand (12) is provided on both left and right sides of the bonnet (4), and a steering handle (13) is provided in front of the driver's seat (10) at the rear of the bonnet (4), and a step (14a) is performed. The upper side of the transmission case (6) and the like is covered by the vehicle body cover (14) forming the.

Further, in the figure, (15) is a planting part equipped with a seedling placing table (16) for multi-row planting, a planting claw (17), etc., and the rear tilting type seedling placing table (16) is provided with a guide rail (18). ) And a guide rail (19) to support the planting case (20) so that it can reciprocate left and right, and a cranking planting arm (21) and a planting claw drive shaft (22) to plant the planting case. Attach the planting claw (17) to (20). Below the planting case (20), a main leveling float (23) and left and right side floats (2)
4) (24) is installed, a link hitch (25) is provided on the front side of the planting case (20), and a three-point link mechanism (28) including a top link (26) and a lower link (28) is used. A hydraulic cylinder (29) for connecting the link hitch (25) to the driving frame (11) and moving up and down the planting part (15) between the mission case (5) and the top link (26). , The output of the engine (2) is transmitted to the mission case (5) to drive the front and rear wheels (8) and (9) for traveling in the paddy field at a substantially constant speed, and at the same time, the seedling mounting table (16) is slidable left and right. The seedlings for one plant are continuously taken out by the planting claws (17) and the seedlings are planted in the field.

As shown in FIGS. 4 to 5, the main rod gear shift operation (32) and the shift arm (33) are provided with a front and rear swing fulcrum shaft (34) and a left and right swing fulcrum shaft (35). The traveling speed change lever (36) is connected and supported, and the lever guide plate (37a)
By oscillating the speed change lever (36) back and forth along the guide groove (38), the traveling mode is appropriately changed to road traveling speed, neutral traveling speed with planting, and backward traveling. ing.

The driving frame (11) has a horizontal frame (39) connected between the left and right axle cases (6) and (6), and a lower end fixed to the horizontal frame (39) and the vehicle body cover (14) attached to the upper end. A hydraulic switch valve (41), which is composed of left and right vertical frames (40a) and (40b) for supporting and vertically expands and contracts the hydraulic cylinder (29), is mounted on the guide frame (42) on the valve bracket (42). It is fixedly supported via 42a). Further, the bearing cylinder (43) is fixed to the vertical frames (40a) (40b), and the operation rotation shaft (44) is inserted into and supported by the receiving cylinder (43) to support the rotation shaft (44). The right end is interlockingly connected to the planting lift lever (46) via the left and right swing fulcrum shaft (45). An operating piece (48a) for contacting the spool (47) of the switching valve (41) is integrally fixed to the rotating shaft (44), and a planting clutch wire (49) for connecting to the planting clutch is engaged. The clutch arm (50) to be stopped is fixed to the rotating shaft (44), and the lever guide plate (37b)
By swinging the elevating lever (46) back and forth along the guide groove (51), the planting part (15) can be raised and lowered and the planting clutch can be turned on and off. .

Further, an interlocking arm (52) is provided at the left end of the rotating shaft (44).
When the gear shift lever (36) is rocked from the forward drive position to the reverse drive position, the interlocking pin (54) is supported in the middle of the gear shift lever (36) through the holder (53). The tip of the pin (54) is engaged with the interlocking arm (52), and the operating piece (48a) is integrally rotated via the rotary shaft (44) to retract the spool (47) and to move the planting section (15). )
Is configured to rise. The pin (54) is inserted into the holder (53) fixed in the middle of the speed change lever (36) and slidably supported in the axial direction of the rotary shaft (44), and the tip of the pin (54) is compressed by a compression spring or the like. It is provided so as to project toward the interlocking arm (52) side, and when the speed change lever (36) is tilted slightly to the right to switch from the forward planting position to the reverse position, the lifting lever (46) is in the lowered position. The tip of the pin (54) is engaged with the front end of the interlocking arm (52) to rotate the rotary shaft (44) to convert the elevating lever (46) to a raised state, and at the same time, a hydraulic switching valve (41) which is an elevating mechanism. Is operated to raise the planting part (15). Further, a spring (57) over a fulcrum is urged to the lifting lever (46) to hold the position when the lever (46) is converted to a lowered position or a raised position. A spring (64) for returning to the right and left inclination is stretched between the receiving metal fitting (63) fixed to the right end of the 44) and the elevating lever (46).

The operation shaft (44) is rotatably supported by another operation section (48b) which is adjacent to the operation piece (48a) and has one end in contact with the spool (47). ,
Sensor wire (6) that connects one end to the main float (23)
5) is connected to the operation piece (48b) through the float sensitivity adjusting lever (66), and the spool (47) is appropriately advanced and retracted in accordance with the change in the ground pressure of the float (23). ) Automatically controls the planting part (15) to keep the ground pressure of () substantially constant, and adjusts the lever (66).
Hard and soft topsoil (dry field / wet field)
In addition, the sensitivity of the load applied to the float according to each hardness such as standard is adjusted.

Next, as shown in FIGS. 1 and 4, the rotary shaft (44)
The receiving lever (67) is fixedly installed on the right side, and the cylindrical shaft (69) is provided on the right vertical frame (40b) via the support shaft (68), and the roll (70) that abuts on the receiving lever (67) is provided. Pressure lever (7
1) Axially support the tip of the pressure lever (71),
It is fixed to 9), and when the lifting lever (46) is raised, the receiving lever (67) is brought into pressure contact with the roll (70) to retract the pressure lever (71).

Further, a stopper (72) for restricting the downward swing of the elevating lever by the pressure lever (71) is provided on the cylinder shaft (69), and a stopper (73) for adjusting the neutral position is provided on the vertical frame (40b). One end of the restoring wire (75) is connected to a piston rod (74) of a hydraulic cylinder (29) that abuts (72) and raises the planting part (15), and the arm (69) of the cylinder shaft (69) is connected. 76) through the restoring spring (77) to the wire (7
5) Connect the other end, pull the wire (75) by advancing the piston rod (74), increase the spring (77) force in conjunction with the raising operation of the planting part (15), and roll (70) Is pressed against the receiving lever (67) to return the lift lever (46) to the neutral position, and the stopper (72) is brought into contact with the bolt (73). As shown in FIG. Compared with the lever ratio (B: A) between the receiving lever (67) and the pressure lever (71), the lever ratio (B ': A') of each lever (67) (71) on the neutral side becomes larger. , The spring (77) force accumulated by pulling the wire (75) is applied to each lever (67) (71).
It acts more strongly at the end of the interlocking stroke of, and the hydraulic switching valve (41) and the elevating lever (46) are configured to immediately return to neutral from this transitional period.

This embodiment is configured as described above, and by operating the lifting lever (46) back and forth at the rear portion of the guide groove (51), the hydraulic valve (4) is operated via the operation piece (48a).
While moving the spool (47) of 1) to move up and down or fix the planting part (15), it is planted through the clutch wire (49) by operating the front part of the guide groove (51) back and forth. The clutch is operated "on" and "off". By operating the lifting lever (46) to move upward, the lever (46) is supported by the spring (57) at the raised position, and the piston of the hydraulic cylinder (29) is moved. The rod (74) advances to raise the planting part (15), and in conjunction with it, the spring (77) is pulled via the wire (75), and the force of the spring (77) causes the pressure lever (71). Roll (70) of lever (6
The lifting lever (46) is returned to a neutral position in which the stopper (72) abuts the bolt (73) by being pressed against the bolt (73).

Further, FIG. 7 shows another embodiment, in which the spring (7
By omitting 7), the restoring wire (75) is directly connected to the arm (76), and a fulcrum type restoring spring (78) is provided, and this spring (78) is connected to the arm (76). When the piston rod (74) of the cylinder (29) advances, the wire (75) is pulled in conjunction with the rise of the planting part (15) and the roll (70) of the pressure lever (71) is received by the lever (67). And press the lift lever (46) to the neutral side,
The spring (78) is actuated at the end of the interlocking stroke of each lever (67) (71), and the force of this spring (78) causes the lifting lever (46) to return to the neutral position. In addition,
A wire (75) is connected to the piston rod (74) via a buffer spring (75a).

As is clear from the above, in the rice transplanter lifting device in which the lifting lever (46) for lifting and lowering the planting part (15) is held in the raised position by the spring (57), the force against the spring (57) is resisted. A restoring spring (77) (78) for returning the elevating lever (46) to the neutral position is provided, and a wire (75) and a restoring spring (75) that are pulled by an ascending operation of the planting portion (15) of the lifting hydraulic cylinder (29). The ends of 77) and (78) are connected to a pressure lever (71), the pressure lever (71) is rotatably provided, and the pressure is applied to a receiving lever (67) integrally fixed to an elevating lever (46). The pressure lever (71) is brought into contact with the pressure lever (71) by the pulling operation of the wire (75) to rotate in the neutral return direction, and acts on the receiving lever (67) via the pressure lever (71). At the position where the force of the restoring spring (77) (78) increases, the receiving lever (67) and the pressure lever are And it is relatively arranged (71).

Further, FIG. 8 shows another embodiment, in which a push rod (79) is provided in place of the pressure lever (71), and the rod (79) is brought into contact with the receiving lever (67) by the restoring spring (80). Contact them to move the lift lever (46) to the neutral side,
A stopper (81) such as a nut for restricting the advance of the rod (79) against the spring (80) is attached to the screw (79) of the rod (79).
Screw it to a) so that its position can be adjusted. In addition, the lifting lever (4
6) When the push rod (79) is retracted to the raised position, a lock pin (82) that locks the push rod (79) is provided, and the restoration wire (75) is connected to the piston rod (74) of the hydraulic cylinder (29). The lock pin (82) is connected to. Then, the push rod (79) is retracted by the raising operation of the elevating lever (46) and the lock pin (82) is engaged with the push rod (79), and the planting portion (15) is moved by the advance of the piston rod (74). Ascend, pull out the lock pin (82) through the wire (75), project the push rod (79) by the force of the restoring spring (80), and move the lift lever (46) to the stopper (8).
It is forcibly returned to the neutral position set in 1).

"Effects of the Invention" As is apparent from the above examples, the present invention is based on the planting part (15).
A raising and lowering device of a rice transplanter that holds an elevating lever (46) for raising and lowering a spring by a spring (57), and a restoring spring for returning the elevating lever (46) to a neutral position against the force of the spring (57). Wires (75) and restoration springs (77) that are equipped with (77) and (78) and that are pulled by the raising operation of the planting part (15) of the lifting hydraulic cylinder (29).
The end of (78) is connected to the pressure lever (71), the pressure lever (71) is rotatably provided, and the pressure lever is attached to the receiving lever (67) integrally fixed to the lifting lever (46). (71) is brought into contact with the wire (75), and the wire (75) is pulled to rotate the pressure lever (71) in the neutral return direction.
Restoring spring (77) acting on the receiving lever (67) via 1)
(78) The receiving lever (67) and the pressure lever (71) are arranged relative to each other at a position where the force increases. (67) (71) detects and restores the springs (77) (78) to act as a neutral return force of the lift lever (46), and the spring (57) restores the lift lever (46) held in the raised position. Spring (7
7) (78) is returned to the neutral position by the force, so that it is possible to easily simplify the operation of the lifting lever (46) by utilizing the fulcrum crossing action of the spring (57) and restore spring (77) (78 ) Can always return the lift lever (46) to the proper position, and the lift hydraulic cylinder (4
It is possible to eliminate the conventional problems such as 6) that the hydraulic pressure switching valve (41) is held at the switching transition position, and to easily obtain a stable lifting / lowering switching operation with a simpler lifting lever (46) operation than in the past. Is something that can be done.

[Brief description of drawings]

FIG. 1 is a side view of a main part showing an embodiment of the present invention, FIG. 2 is a side view of a riding rice transplanter, FIG. 3 is a plan view of the same, FIG. 4 is a rear view of the main part, and FIG. FIG. 6 is a side view of the same portion, FIG. 6 is an enlarged view of the same portion, and FIGS. 7 and 8 are side views of essential parts showing another embodiment. (15) …… Planting part (29) …… Lifting hydraulic cylinder (46) …… Lifting lever (57) …… Spring (67) …… Receiving lever (71) …… Pressurizing lever (75) …… Wire (77) (78) …… Restoring spring

Claims (1)

[Claims] 1. A raising and lowering device of a rice transplanter in which a raising and lowering lever (46) for raising and lowering a planting part (15) is held in a raised position by a spring (57), and the raising and lowering lever resists the force of the spring (57). A restoring spring (77) (78) for returning the (46) to the neutral position is provided, and the lifting hydraulic cylinder (2
9) Implantation part (15) The wire (7
5) and the ends of the restoring springs (77) (78) are connected to the pressure lever (71), the pressure lever (71) is rotatably provided, and is integrally fixed to the elevating lever (46). Lever (6
The pressure lever (71) is brought into contact with 7), and the wire (7)
Position where the force of the restoring springs (77) (78) acting on the receiving lever (67) via the pressure lever (71) increases due to the rotation of the pressure lever (71) in the neutral return direction due to the pulling action of 5). A lifting device for a rice transplanter, characterized in that a receiving lever (67) and a pressure lever (71) are arranged relative to each other.