JP2530411Y2 - Elevating device for riding rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention relates to a lifting device for a riding rice transplanter.

(B) Conventional technology Conventionally, a riding rice transplanter has a planting portion connected to a rear of a traveling portion by a lifting device so as to be able to move up and down. The lifting device is a lifting link mechanism and a lifting device for raising and lowering the lifting link mechanism. And an actuator.

The elevating link mechanism is formed of a pair of upper and lower top links and a lower link whose front and rear ends are respectively connected to the traveling portion and the planting portion.

(C) Problems to be solved by the invention However, in the above elevating device, when the planting portion is lowered, the rear end of the float provided in the planting portion may run on ridges or the like. In this case, the weight of the planted portion supported by the lifting link acts as a load on the float, causing a problem that the float or a member supporting the float is deformed or damaged.

(D) Means for Solving the Problems Therefore, in the present invention, a riding rice transplanter in which the planting section is connected to the rear of the traveling section via a lifting link mechanism, and the planting section can be raised and lowered by a lifting hydraulic cylinder. In the lifting device of
The elevating link mechanism is formed from a pair of upper and lower top links and a lower link in which the front and rear ends are connected to the running part and the planting part so that the front and rear ends can be freely rotated up and down. The rear end and the front end of the rear half link are pivotally supported by a pivot pin so as to be freely rotatable in the vertical direction so that the center can be bent around the pivot pin and the angle of inclination of the running part in the front-rear direction is detected. An inclination sensor, a control unit that expands and contracts the front half link based on the detection result of the inclination sensor, and a feedback sensor that inputs the detection result of the expansion and contraction length of the front half link to the control unit. It is an object of the present invention to provide a lifting device for a riding rice transplanter, wherein the extension / retraction operation of the front half link is stopped by a control unit based on a detection result of a feedback sensor.

(E) Function / Effect According to the present invention, the following function / effect is produced.

That is, in the present invention, since the middle part of the top link is formed so as to be able to be bent freely, when the rear end of the float provided in the planting part runs on a ridge or the like,
The top link, which receives the reaction force as a compressive force from the ridges and the like, is folded in the middle, and the rear part of the planting part is rotated upward around the rear end connecting part of the lower link, so that the planting part is directly attached to the float. Can be prevented from acting as a load, and a float or a member supporting the float can be prevented from being deformed or damaged.

Also, in the normal use state where the planting part is raised and lowered, since only the pulling force acts on the top link, even if the middle part of the top link can be freely bent, there is no adverse effect on normal use, The planting section can be reliably moved up and down.

In addition, the front-rear inclination of the traveling section is detected by the inclination sensor, and based on the detection result, the control section causes the front half link to expand and contract, and the feedback sensor detects the expansion and contraction operation of the front half link, and based on the detection result, Based on the control, the control section stops the front half link, so the front half link properly corrects the front-back inclination of the planting section, keeping the planting depth of the seedlings constant and improving the planting work. Can be secured.

Further, when the posture of the planting section is controlled by the extension operation of the first half link, when the load acts on the top link via the planting section due to a stone or the like in the field, the top link is also used. Can be prevented from being broken so that the load acts on the expansion / contraction drive means and the like of the front half link to absorb the load and damage the expansion / contraction drive means and the like.

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

(A) shown in FIG. 1 is a riding rice transplanter. The riding rice transplanter (A) includes a planting section (2) behind a self-propelled traveling section (1) and an elevating link mechanism (3). The planting section (2) can be moved up and down by a lifting hydraulic cylinder (4).

Moreover, such a riding rice transplanter (A) is provided with a planting portion attitude control device (60), and the control device (60) can keep the planting depth of the seedling by the planting portion (2) constant. The control device (60) will be described later.

First, the traveling section (1) will be described with reference to FIG. 1 and FIG.

As shown in FIGS. 1 and 2, the traveling section (1) includes an engine (11) at a front portion on a body frame (10) and an operating portion (12) at a rear portion.

The transmission case (13) is connected to the engine (11) and attached to the lower rear portion of the body frame (10).

Left and right front axle cases (15) are located on the lower front of the fuselage frame (10).
The front wheels (16) and (16) are attached to the ends of the cases (15) and (15). (19) is a transmission shaft that interlocks the front axle case (15) and the transmission case (13).

A rear axle case (17) is connected to the transmission case (13) at the rear of the fuselage frame (10), and the rear wheels (18) and (18) are mounted on the left and right sides of the case (17). ing.

(20) is a casing body which also serves as a floor surface, a speed change guide, a fender, a seat mounting plate (20a), etc.
It is integrally molded from a synthetic resin having high rigidity and stretched on the body frame (10).

Also, (21) is a bonnet and the engine (11)
And the steering shaft (2
3) covers.

The operating section (12) has a steering shaft (23) installed immediately after the engine (11), and a handle (24) is attached to an upper end of the shaft (23). The seat (25) is placed on the seat mounting plate (20a) located immediately behind.

Further, a control unit (C) constituting a part of the planting portion attitude control device (60) is attached to a rear portion of the upper surface of the casing body (20).

Further, (30) is a shift lever disposed on the left side of the seat (25), (31) is an auxiliary shift lever protruding above the left side of the hood (21), and (32) is a seat ( 25) The planting part elevating lever arranged on the right side of (25), (33) is the clutch pedal arranged on the left side of the bonnet (21), (34) is the brake pedal arranged on the right side of the bonnet (21) ,
(35) is a spare seedling platform.

Also, as shown in FIG. 1, the planting section (2) has a planting mission case (40) at the lower rear of the lifting link mechanism (3).
The front end of the case (40) is mounted so that it can swing left and right, the float (41) is installed below the case (40), the seedling mounting table (42) is installed above the case (40), and the rear end of the case (40) The planting claw (43) is attached to the part. (44) is a transmission shaft interposed between the transmission case (13) and the planting transmission case (40).

As shown in FIGS. 3 and 4, the lifting link mechanism (3) includes a front end of a top link (51) and a left and right lower link (45) at upper and lower sides of a rear portion of the body frame (10).
The front end of (45) is pivotably supported vertically by pivots (51a) (45a), respectively, between the rear end of the top link (51) and the rear ends of the left and right lower links (45) (45). The lift link mechanism side hitch portion (61) is interposed, and the hitch portion (61) is detachably connected to a planting side hitch portion (49) provided upright in front of the planting portion (2).

At the front ends of the left and right lower links (45) and (45), left and right elevating arms (46) and (46) are erected, respectively, so as to stand between the upper ends of both arms (46) and (46) and the body frame. (10) A lifting hydraulic cylinder (4) is interposed between the middle part and the middle part, and between the upper ends of the arms (46) and (46) and the rear ends of the left and right lower links (45) and (45). Connecting rod (48)
(48) is interposed.

The hitch portion (61) on the lifting link mechanism side is provided with a locking rod receiving portion (61) having a U-shaped cross section at the upper end of the hitch body (61a).
While b) is provided, the locking pieces (61c) (61c) are attached to the left and right sides of the lower portion of the hitch body (61a) by rotating and biasing them upward by springs (61d). (61e) is a spring locking pin, (61f) is a lever for unlocking the locking piece (61c), and (61g) is a pivot.

The planting side hitch part (49) has a locking rod (49b) mounted on the upper part of the rear view-side hitch body (49a), and the lower part of the hitch body (49a) on the left and right sides, respectively. The locking pins (49c) (49c) are protruded laterally outward, and the locking pieces (61c) (61c) can be locked to the locking pins (49c) (49c).

(63) shown in FIGS. 3 to 5 is a drawing marker pulling-up mechanism. The mechanism (63) is provided on the pivot (61g) by a pair of left and right brackets (63a) (63a). A pair of left and right L-shaped levers (63c) (63
c) Pivot the middle part, and connect one end (63j) (63j) of each lever (63c) (63c) to the middle part of the lower link (45) (45) via the wire (63d) (63d). The pivoting levers (63e) and (63e) pivotally support the middle part of the interlocking levers (63e) and (63e) on the hitch body (49a) of the planting side hitch part (49). The front side (63k) (63k) can be engaged with the other end (63m) (63m) of the L-shaped lever (63c) (63c), and the interlocking lever (63e) (63e) rear side (63n) )
Interlocking wires (63f) and (63f) are interlockingly connected between (63n) and left and right drawing markers (not shown), respectively. (63h) is the axis.

The middle part of the wires (63d) (63d) is wound around reels (63g) (63g) attached to the upper part of the hitch body (61a) of the hitch part (61) of the lifting link mechanism.
(63p) is the pivot, (63q) is the L-shaped lever locking hook,
(63r) is a spring that locks and urges the hook (63q).

With this configuration, the L-shaped levers (63c) and (63c) are connected to the wire (63) in conjunction with the lifting operation of the lifting link mechanism (3).
d) While rotating through (63d), the lever (63c)
The other end (63m) (63m) of (63c) is linked with the interlock lever (63e) (63
e), the interlocking levers (63e) and (63e) are rotated counterclockwise in the side view of FIG. 3 to engage the interlocking levers (63e) and (63e). ), The interlocking wires (63f) and (63f) connected to the rear end are pulled up so that the drawing marker stands up and can be stored.

At this time, the L-shaped lever locking hook (63q) (63q)
L-shaped lever (63c) (63c)
c) Since the rotation of (63c) is restricted, the drawing marker is held in the upright stored state.

The operation of the lifting hydraulic cylinder (4) is controlled by a hydraulic control valve (69) shown in FIG.
Is controlled by a sensor (S) that detects a change in height difference between the planting section (2) and the float (41).

That is, the sensor (S) comprises a sliding rod (71) having a pivot (41b) projecting from the front upper surface of the float (41) and an elongated hole (70) being drilled in the pivot (41b). Of the mission case (40) in the front extension (40)
Insert the guide pin (72) protruding from a) movably,
The hydraulic control valve (69) spool (7
The outer wire (74) connected to 3), the inner wire (75) of the same wire (74) is connected to the guide pin (72), and the same wire (74) is moved up and down by the float (41).
Is transmitted to the spool (73) of the hydraulic control valve (69) to operate the lifting hydraulic cylinder (4).

The hydraulic control valve (69) is a five-position control valve. In the central neutral position (76), the lifting hydraulic cylinder (4)
Block the side and choke (7
8) The hydraulic pump (P) and the lifting hydraulic cylinder (4) are connected with the interposition of the hydraulic pump (P) and the hydraulic pump (P) and the lifting hydraulic cylinder (4) are directly connected at the left position (79).
At the right position (80) of the neutral position (76), the lifting hydraulic cylinder (4) and the reservoir (82) are connected via the choke (81), and at the right outer position (83), the lifting hydraulic cylinder (83) is directly connected. 4) is connected to the reservoir (82).

Therefore, the position of the planting part (2) is low and the wire (7
4) When the hydraulic control valve (69) side of the inner (75) is retracted, the spool (73) is moved to the left to contract the elevating hydraulic cylinder (4) and raise the planting part (2). Conversely, when the position of the planting portion (2) is high and the hydraulic control valve (69) side of the inner (75) of the wire (74) is pulled out, the spool (73) is moved to the right to raise and lower the hydraulic pressure. By extending the cylinder (4) and lowering the planting part (2), the planting part (2) is supported at a constant height and the planting depth of the seedling is kept constant.

Further, at the center neutral position (76), the lifting hydraulic cylinder (4) side is blocked, and at the left position, the hydraulic pump (P) and the lifting hydraulic cylinder (4) are connected via a choke (78). At the left position (79), the hydraulic pump and the lifting hydraulic cylinder (4) are directly connected, and at the right position (80) of the neutral position (76), the choke (8) is connected.
Optimal planting by connecting the lifting hydraulic cylinder (4) and the reservoir (82) with the interposition of 1) and directly connecting the lifting hydraulic cylinder (4) and the reservoir (82) at the right outside position When the absolute value of the deviation from the set value of the height difference between the planting part (2) and the float (41) that matches the depth is small, the planting part (2) is moved up and down at a low speed, and the deviation is calculated. When the absolute value of is large, the planting section (2) is moved up and down at a high speed so that a stepwise proportional operation is performed.

In such a configuration, the gist of the present invention resides in that the middle part of the top link (51) is formed to be freely bendable.

That is, as shown in FIG. 3, the top link (51)
Is connected by pivotally supporting the rear end of the front half link (52) and the front end of the rear half link (53) in a vertically rotatable manner by a pivot pin (54). ) Is designed to be folded around the pivot pin (54) only when a compressive force is applied.

Therefore, as shown in FIG. 7, when the rear end of the float (41) provided in the planting portion (2) runs on the ridge (u) or the like, the compressive force is applied from the ridge or the like. The top link (51) receiving the reaction force is in a bent state, and the rear portion of the planting portion (2) is upward (centering around the rear end connecting portion of the left and right lower links (45) and (45) ((a) in the figure)). Direction) to prevent the weight of the planting portion (2) from acting directly as a load on the float (41).
1) and deformation or damage of the member supporting the float (41) can be prevented.

Also, in a normal use state in which the planting portion is raised and lowered, since only the pulling force acts on the top link (51), even if the middle of the top link (51) can be freely broken, there is no adverse effect on the normal use. There is no need to give it, and it is possible to surely control the elevation and the posture of the planting section.

Also, the first half link (52) of the top link (51)
A link main body (52a), a telescopic screw (52b) screwed to the link main body (52a), a telescopic drive motor (52c) for operating the telescopic operation by rotating the telescopic screw (52b) forward or reverse.
Detecting the expansion / contraction limit of the telescopic screw (52b),
The detection switch (52d) (52e) for stopping the driving of c) is configured to be adjustable in expansion and contraction. (52f) is a detection rod, and (52g) is a bellows-like cover.

The first half link (52) constitutes a part of a planting section attitude control device (60) described later.

That is, as shown in FIG. 8, the planting portion posture control device (60) includes a tilt sensor (S1) and a telescopic drive motor (52c).
The first half link (52) having the first half link (5
It comprises a feedback sensor (S2) attached to 2) and a control unit (C).

The tilt sensor (S1) is attached to the left side of the up-down link mechanism side hitch portion (61), and the tilt in the front-rear direction when the traveling portion (1) pitches along the unevenness of the tillage (front up tilt). Or the angle of the front descent) is detected.

Note that the inclination sensor (S1) can be provided in the traveling section (1).

The front half link (52) swings both the hitch portions (61) and (49) back and forth by the expansion and contraction operation, and swings the rear portion of the planting portion (2) up and down. Correcting the front-back inclination of (2), keeping the relative angle between the planting part (2) and the running part (1) constant, and keeping the planting depth of the seedling by the planting part (2) constant So that you can keep it.

The feedback sensor (S2) uses a potentiometer or the like and is attached to the telescopic drive motor (52c), and the first half link (5
2) It detects the expansion and contraction.

Further, as shown in FIG. 8, the control unit (C) inputs the detection result of the forward and backward inclination of the traveling unit (1) by the above-mentioned inclination sensor (S1), and based on the detection result, the first half link ( 52) is output to extend / contract, while the detection result of the extension / retraction length of the first half link (52) by the feedback sensor (S2) is input, and the first half link (52) is extended / contracted based on the detection result. The operation is stopped.

With the above-described configuration, the inclination sensor (S1) detects the front-back inclination of the traveling unit (1), and based on the detection result, the control unit (C) causes the front half link (52) to expand and contract, and The feedback sensor (S2) detects the expansion / contraction operation of the first half link (52), and the control unit (C) stops the first half link (52) based on the detection result. ), The inclination of the planting portion (2) in the front-rear direction can be appropriately corrected, the planting depth of the seedlings can be kept constant, and the planting operation can be satisfactorily secured.

In addition, by the extension operation of the first half link (52),
When the posture of the planting section (2) is controlled and a load acts on the top link (51) via the planting section (2) due to a stone or the like in the field, the top link (51) is also used. ) Is folded, and the load is absorbed, so that the load can be prevented from acting on the telescopic drive motor (52c) of the front half link (52) and the like, which can be prevented from being damaged.

FIG. 9 shows an elevating device as another embodiment, in which a compressive force for absorbing a compressive force is provided between the hitch portion (61) of the elevating link mechanism and the connecting rods (48) (48). An absorber (55) is provided, and the absorber (55) absorbs the compressive force acting on the top link (51), and the float (41) of the planting portion (2) and the deformation or deformation of the float (41) It is designed to prevent damage and the like. (55
a) (55b) is a connecting pin.

The absorber (55) also has a function of quickly restoring the broken top link (51) to a straight line.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter equipped with a lifting device according to the present invention. FIG. 2 is a plan view of the rice transplanter. FIG. 3 is an enlarged side view of the planting section attitude control device. FIG. 4 is a plan view of the planting section attitude control device. FIG. 5 is a front view of a drawing marker pulling mechanism. FIG. 6 is a hydraulic circuit diagram for controlling the lifting link mechanism. FIG. 7 is an explanatory diagram of a top link in a folded state. FIG. 8 is a block diagram of a planting section posture control device. FIG. 9 is an enlarged side view of a lifting device as another embodiment. (A): Rice transplanter (C): Control unit (S1): Tilt sensor (S2): Feedback sensor (1): Traveling unit (2): Planting unit (3): Elevating link mechanism (60): Planting Attachment posture control device

Claims (1)

(57) [Scope of request for utility model registration] 1. A rice transplanting plant in which a planting portion (2) is connected to a rear portion of a traveling portion (1) via a lifting link mechanism (3), and the planting portion (2) can be raised and lowered by a lifting hydraulic cylinder. In the elevating device of the machine, the elevating link mechanism (3) is connected to the traveling part (1) and the planting part (2).
The front link (52) is formed from a pair of upper and lower top links (51) and front and rear links (45), whose front and rear ends are rotatably connected to each other. The rear end and the front end of the rear half link (53) are pivotally supported vertically by a pivot pin (54) so as to be freely bendable about the pivot pin (54). (1) a tilt sensor (S1) for detecting the angle of tilt in the front-rear direction, and a control unit (C) for expanding and contracting the front half link (52) based on the detection result of the tilt sensor (S1).
And a feedback sensor (S2) for inputting the detection result of the expansion / contraction length of the first half link (52) to the control unit (C), and the control unit based on the detection result of the feedback sensor (S2). (C) The raising and lowering device of the riding rice transplanter, wherein the expansion and contraction operation of the front half link (52) is stopped.