JPH1052127A - Sulky type rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sulky type rice transplanter, excellent in operating efficiency in assembling and capable of readily performing operations to install and remove a machine body cover. SOLUTION: This sulky type rice transplanter is equipped with a controlling means for controlling the lifting and lowering of a seedling transplanting device connected to the rear of a machine body based on results of sensing of vertical displacement with a sensor float, a lifting and lowering operating lever 70 for artificially operating the lifting and lowering of the seedling transplanting device and further a control sensitivity regulating mechanism for mechanically regulating the operation sensitivity of the sensor float. In this case, a regulation operating part of the control sensitivity regulating mechanism is assembled and installed in a lever guide 72 of the lifting and lowering lever 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control means for raising and lowering a seedling planting device connected to a rear part of an airframe based on a detection result of a vertical displacement of a sensor float, and a lifting operation lever for artificially raising and lowering the seedling planting device. And a control type rice transplanter having control sensitivity adjusting means for mechanically adjusting the operation sensitivity of the sensor float.

[0002]

2. Description of the Related Art Conventionally, as the riding type rice transplanter,
For example, Japanese Patent Application Laid-Open No. Sho 62-205712 and
As disclosed in JP-A-224203, there is known a device provided with a raising / lowering operation lever for manually raising and lowering a seedling planting device and a sensitivity adjustment lever for mechanically adjusting the operation sensitivity of a sensor float. I have. In addition, Japanese Unexamined Patent Publication
As disclosed in JP-A-202117, there has been proposed a configuration in which the lifting operation lever and the sensitivity adjustment lever are guided by a common lever guide. These levers are provided so as to protrude upward from the body cover at a lateral portion of the driver's seat, so that the levers can be easily operated while driving.

[0003]

Conventionally, the lifting operation lever and the sensitivity adjustment lever are respectively mounted on the body side,
The lever was provided so as to protrude upward through the lever guide provided on the body cover, so that the lever had to be inserted into the guide groove of the lever guide when attaching and detaching the body cover. A larger diameter lever blip had to be attached and detached, which was troublesome for assembling and disassembling maintenance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its main object to provide excellent assembling workability and to facilitate the work of attaching and detaching an airframe cover. I do.

[0005]

[Means for Solving the Problems]

 [Configuration, operation and effect of the invention according to claim 1]

(Structure) The invention according to claim 1 is a control means for raising and lowering a seedling planting device connected to the rear part of the fuselage based on a vertical displacement detection result of a sensor float, and artificially raising and lowering the seedling planting device. What is claimed is: 1. A riding type rice transplanter comprising an elevating operation lever and control sensitivity adjusting means for mechanically adjusting the operation sensitivity of the sensor float, wherein an adjusting operation part of the control sensitivity adjusting means is provided with a lever guide of the elevating operation lever. It is characterized in that it is assembled and installed.

(Operation) According to the above configuration, the adjusting operation section of the control sensitivity adjusting means can be attached to the lever guide of the elevating operation lever in advance, and then the lever guide can be attached to the machine body side. And can be easily assembled to the lever guide. Also, in the case of disassembly and maintenance, the operation can be performed by removing the adjusting operation section of the control sensitivity adjusting means together with the lever guide from the body and moving to a large work space away from the body.

(Effects) Therefore, according to the first aspect of the present invention, as compared with the case where the adjusting operation section of the control sensitivity adjusting means is directly mounted on the body, the mounting work and disassembly and maintenance are facilitated, and the workability is improved. .

[Structure, operation and effect of the invention according to claim 2]

(Structure) According to a second aspect of the present invention, in the first aspect of the present invention, an opening is formed in a portion of the fuselage cover detachable from above with respect to the fuselage frame on the side of the seat, and the lever guide is provided. Is characterized in that the lever guide is connected to the body frame so as to face this opening, and the body cover is detachable while leaving the lever guide.

(Operation) According to the above configuration, the lever guide is left on the fuselage side when the fuselage cover is removed, so that the fuselage cover can be removed and attached without the trouble of attaching and detaching the large diameter lever blip.

(Effects) Accordingly, the invention according to claim 2 provides the above-described effects of the invention according to claim 1, and also makes it possible to easily perform the operation of attaching and detaching the body cover.

[Structure, operation and effect of the invention according to claim 3]

(Structure) The invention according to claim 3 is characterized in that, in the invention according to claim 2, the upper surface of the lever guide is formed as an outwardly inclined surface.

(Operation) According to the above configuration, it is possible to use the lever guide while increasing the substantial width of the lever guide while reducing the width of the lever guide in plan view.

(Effect) Therefore, according to the third aspect of the present invention, the above-described effect of the second aspect of the present invention is provided, and even if it is difficult to secure a large lever operation space in the lateral portion of the driver's seat, When there is a lever operation space having a substantially large width, the lever can be reliably guided with the same width as a tractor, and the handleability can be improved without increasing the size of the body cover in the lateral direction. .

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. This riding type rice transplanter is a four-wheel drive riding traveling body 3 having a pair of left and right front wheels 1 and rear wheels 2.
At the rear, a four-row planting seedling planting device 5 is connected via a four-link mechanism 4 so as to be able to ascend and descend freely, and spare seedling rests 6 are provided on the front left and right of the riding traveling machine 3 respectively. It has a structure. Here, the quadruple link mechanism 4 includes a connection point between the front end of the upper link 4a and the body side,
The hydraulic cylinder 7 is constructed so as to extend over a connection point between the rear end of the lower link 4b and the lower end of the rear link 4c. The shortening drive of the hydraulic cylinder 7 raises and lowers the four-link mechanism 4. The four-link mechanism 4 is lowered by its own weight by the extension operation of the hydraulic cylinder 7. In the seedling planting apparatus 5, a seedling stand 8, on which seedlings are placed and reciprocated horizontally with a constant stroke, a four-row planting mechanism 9 for planting two strains by one rotation, and leveling of the planted rice field. The whole seedling planting apparatus 5 is connected to the lower part of the rear link 4c so as to be rotatable around the axis P in the front-rear direction.

The body frame 11 of the riding vehicle 1
As shown in FIGS. 11 and 13, a pair of left and right main frames 12 arranged long in front and rear are arranged parallel to each other, and a pair of left and right long outer frames arranged front and rear are arranged laterally outside in parallel in plan view. 13, a front horizontal frame 14 connecting the front of the main frame 12 and the front of the outer frame 13,
It comprises a rear horizontal frame 15 for connecting the rear part of the main frame 12 and the rear part of the outer frame 13 and a connecting member 16 for connecting the rear parts of the main frames 12, and the whole is configured in a rectangular lattice shape.

As shown in FIG. 14, each of the left and right main frames 12 is formed by welding a pair of left and right sheet metal press materials 12a and 12b into a flange-like shape to form a long square pipe in the longitudinal direction. Sheet metal press material 1 located in
A wide and substantially trapezoidal vertical frame portion 12A is extended and extended in a series from the front and back from 2a, and the left and right vertical frame portions 12A are connected by the connecting member 16. A reinforcing member 12c made of a sheet metal stamped material having a U-shaped cross section is welded to the outer side surface of the rear portion of the vertical frame portion 12A to form an angle along the rear side of the vertical frame portion 12A. A pipe-shaped support 12B is formed, and the support 12
The other sheet metal press material 1 in which the lower end of B is located outside the fuselage
2b is welded to the upper surface. The front ends of a pair of left and right upper links 4a of the quadruple link mechanism 4 and the base end of the hydraulic cylinder 7 are pivotally connected via a fulcrum shaft 17 to an upper portion of a column portion 12B of the vertical frame portion 12A. At the same time, the front ends of a pair of left and right lower links 4 b of the quadruple link mechanism 4 are pivotally connected to a fulcrum shaft 18 on the outer surface of each main frame 12.

Outer frame 1 constituting body frame 11
3 is a sheet metal press material having a vertical U-shaped cross section, the front horizontal frame 14 is a straight round pipe material, and the rear horizontal frame 15 is A bent round pipe material is used.

The main frame 12 in the shape of a square pipe is formed in a stepped shape rising rearward in a side view, and an axle case 19 supporting the rear wheel 2 mounts a bracket 20 below a rear portion of the main frame 12. A resin body cover 21 entirely covering the body frame 12 from above is detachably mounted. This body cover 2
A driving deck 21a is formed in the front half of the vehicle 1 and a rear wheel fender 21b and a seat support 21 are formed in the rear half.
The driver's seat 24 is rotatably mounted around a fulcrum X on a support bracket 23 integrally formed with the support member 21c and bolted in an anti-vibration manner via an elastic bush 22 above the seat support portion 21c. A rubber (or spring) cushion material 25 for receiving and supporting the seat 24 is attached to the upper surface of the seat support 21c.

The fuselage cover 21 provided on the fuselage frame 12 is elastically mounted and supported via anti-vibration rubbers 26 provided on the front, rear, left and right sides of the outer frame 13.
The seat support portion 21c is elastically received and supported by a rear connecting member 16 that connects the upper portions of the left and right vertical frame portions 12A via an anti-vibration rubber 27. Also, the fuselage cover 2
The connecting pins 28a provided on the left and right of the rear of the
1 are engaged from above in locking metal fittings 29 disposed on the left and right of the rear portion of the vehicle 1 and are positioned in the front-rear direction.
a and connecting pins 2 provided on the front left and right of the body cover 21
8b, hooks 30a, 30 provided on the body frame 11
b, the body cover 21 can be elastically supported on the body frame 11, and the hook 30
By removing a and 30b, the entire body cover 21 can be removed together with the driver's seat 24.

Further, the boarding steps 31 are respectively connected to the outer ends of the left and right outer frames 13 in a hanging manner, and the boarding steps 31 and the left and right main frames 1 are connected to each other.
2, reinforcement stays 32 are respectively installed to reinforce the boarding steps 31 themselves and to reinforce the entire body frame 11.

Main frame 12 in body frame 11
A transmission case 35 that supports the front wheel 1 is connected to the front end of the vehicle, and the transmission case 35 and the axle case 19 are connected by a reinforcing frame 37 made of a pipe material, thereby ensuring the strength of the entire body. An air-cooled engine 36 is mounted on the transmission case 35, and a front frame 38 formed in a U-shape in plan view so as to surround the transmission case 35 from the front is mounted on the front horizontal frame 14 of the body frame 11. Are connected to both ends. The front frame 38 is a sheet metal press structure having a U-shaped vertical section, and headlights 39 are mounted on the left and right sides of the front surface. Also, a horizontal rod portion 6 connecting the lower ends of the columns 6a in the left and right spare seedling rests 6 is provided.
b is connected to the lower part of the front surface of the transmission case 35, and a pair of left and right support members 40 is installed diagonally across the horizontal rod portion 6b and the front frame 38.
The receiving base 42 of the battery 41 is attached over the range. A guard member 43 located in front of the battery 41 is attached to the front of the front frame 38, and a hook 44 used for towing or rope hanging is attached to the horizontal rod portion 6b.
Is provided. Further, a muffler 45 having an exhaust port 45a directed laterally outward is provided at a lower front portion in the front frame 38.

As shown in FIG. 3, a steering gear case 50 is connected to an upper portion of the transmission case 35, and a pitman arm pivotally supported at a lower portion of the transmission case 35 by rotating a steering handle 51 attached to the steering gear case 50. The left and right front wheels 1 are steered by swinging operation of the left and right 52.

The handle post 5 is provided at the rear of the engine 36.
3 and the instrument panel 54 is provided
A fuel tank 55 is installed above the engine 36 so as to partially overlap the engine 36. Further, a bonnet 56 for covering the engine 36 is detachably mounted in front of the instrument panel 54. At the lower portion of the hood 56, a boarding deck portion 56a for performing a walking movement between the front of the fuselage and the driving unit is integrally provided in a projecting manner,
A decorative cover portion 56b that covers the front frame 38 is provided continuously around the periphery of the boarding deck portion 56a.

The engine 36 has an output shaft 36a mounted horizontally in a horizontal direction, and one end of the output shaft 36a and an input shaft 35a of the transmission case 35 are provided with a tension clutch and two sets of belt transmissions having different transmission ratios. A so-called double-tension type sub-transmission 57 that performs high-low two-stage shifting by selectively setting the mechanism to a clutch engaged state.
Are interlocked and linked. On the right side of the engine 36, a hydraulic pump 58 connected to the other end of the output shaft 36a is provided.
Is installed.

The engine power input to the transmission case 35 via the auxiliary transmission 57 is appropriately shifted by a gear-type main transmission (not shown) that shifts forward two stages and reverse one stage, and the left and right front wheels 1 are shifted. And transmitted to the rear axle case 19 via the transmission shaft 59. A part of the power input to the transmission case 35 and subjected to the main transmission is appropriately shifted by an inter-stock transmission (not shown) provided in the transmission case 35 and then transmitted to the transmission shaft 6.
0 to the seedling planting apparatus 5.

The power input to the axle case 19 is transmitted to the left and right rear wheels 2 via left and right side clutches / brakes 61a and 61b, and operates both side clutch / brakes 61a and 61b. Lever 62
a, 62b are provided on the left and right upper surfaces of the axle case 19. On the other hand, the side clutch / brake 61a, 61
b, a pair of side brake pedals 63a, 63
b are arranged in parallel at the front of the right main frame 12, and these side brake pedals 63a, 63b and the levers 62a, 62b are respectively linear rods 64a.
The transmission to the rear wheel 2 is cut off and the braking is applied when the side brake pedals 63a and 63b are depressed.
Here, the right rod 64b is disposed outside the right main frame 12, but the left rod 64a passes above the front part of the right main frame 12 and the vertical frame 16 Opening 6 formed in
5 and is arranged to cross.

A control valve 66 for the hydraulic cylinder 7 and an electric control unit 67 are mounted on the outer surface of the right vertical frame portion 12A, and a hydraulic hose 68 derived from the control valve 66 is connected to the right vertical frame portion 12A. The control unit 67 and the regulator 69 attached to the inner surface of the left vertical frame portion 12A are wired and connected through the opening 65 of the right vertical frame portion 12A. ing.

As shown in FIGS. 6 and 19, the control valve 66 can be forcibly operated only on the upper side outside the right vertical frame portion 12A.
A raising / lowering operating lever 70 linked to a planting clutch (not shown) in the inside, a sensitivity adjusting lever 71 for performing sensitivity adjustment in raising / lowering control of the seedling planting apparatus 5, and a lever guide 72 for these are provided. Guide 7
2 is connected to the outer surface of the vertical frame portion 12A, and the rear portion of the lever guide 72 is connected to the rear horizontal frame 15A.
It is connected and supported.

When the raising / lowering operation lever 70 is moved to the foremost "planting position (p)", the planting clutch is operated and the seedling planting apparatus 5 is maintained at the set height with respect to the rice field. As described above, the seedling planting apparatus 5 is automatically controlled with the planting clutch disengaged at the "lower position (d)" one stage behind, and the seedling planter 5 with the planting clutch disengaged at the "neutral position (n)". 5
Ascending and descending is stopped, and the ascending position (u)
In this configuration, the seedling planting apparatus 5 is forcibly raised in a state where the planting clutch is disconnected. The lifting operation lever 70
The planting clutch operation lever 80 provided in the transmission case 35 is linked via a link mechanism 81. Note that the control valve 66 and the lower link 4b of the elevating link mechanism 4 are linked via a restraining rod 79, and the elevating operation lever 70 is operated to the "elevated position (u)" to set the seedling planting apparatus 5. When the upper limit is reached, the restraining rod 7
The lifting operation lever 70 is pushed back to the "neutral position (n)" via the switch 9, and the lifting is automatically stopped.

FIG. 20 shows an outline of a raising / lowering control structure of the seedling planting apparatus 5. Of the three floats 10 arranged in parallel at the lower part of the seedling planting device 5, the central one is configured as a sensor float 10s for elevation control, and based on the fluctuation of the ground pressure acting on the sensor float 10s, The control valve 66 is automatically operated. That is, the sensor float 10s and the other floats 10
A sensor rod 75 extending from the front of the sensor float 10s is pivotally connected to the free end of a float support arm 82 which can be adjusted and fixed up and down about a fulcrum P1 so as to be able to swing up and down about a fulcrum P2. Is connected to one end of a balance arm 76 swinging about a fulcrum P3, and the other end of the balance arm 76 and the operation arm 6 of the control valve 66 are connected.
6a is linked with a release wire 77. Also,
A spring 78 for urging the sensor rod 75 downward acts on the balance arm 76, and the following elevation control is performed in conjunction with the swing of the sensor float 10s about the fulcrum P2. The operation arm 66a of the control valve 66
Is always applied on the lower side, that is, an urging force for pulling the inner wire 77a of the release wire 77 toward the control valve.

(Control Neutral) When the seedling planting apparatus 5 is maintained at the target height with respect to the rice field, the sensor float 10s
Is in the reference posture, and the upward contact load acting on the sensor float 10s becomes equal to the reference value.
Is maintained at the "neutral" position. (Upward control) When the body reaches a deep part of the cultivator, or the body descends downward and slopes and the seedling planting apparatus 5 sinks below the target height, the upward contact load acting on the sensor float 10s becomes lower than the reference value. Sensor float 10
s is displaced upward, thereby releasing the release wire 7.
7, the pulling operation of the inner wire 77a, the operation arm 66a of the control valve 66 is switched from the "neutral" position to the "raising" position, the hydraulic cylinder 7 is shortened, and the seedling planting device 5 is raised. When the seedling planting device 5 reaches the target height, the seedling planting device 5 returns to the control neutral state, and the raising operation is stopped. (Descent control) When the body reaches a shallow part of the cultivator, or when the body descends forward and the seedling planting apparatus 5 rises from the target height, the upward contact load acting on the sensor float 10s becomes lower than the reference value. Sensor float 10
s is pivotally displaced downward, thereby releasing the release wire 7.
7 is loosened, the operating arm 66a of the control valve 66 is switched from the "neutral" position to the "down" position by the urging force applied thereto, and the hydraulic cylinder 7 is extended to perform seedling planting. The device 5 is lowered. Then, when the seedling planting device 5 reaches the target height, the seedling planting device 5 returns to the control neutral state and the lowering operation is stopped.

The control sensitivity in the elevation control is determined by the reference posture of the sensor float 10s when the control is neutral and the downward bias load (sensor load) applied to the sensor float 10s. In other words, the more the attitude of the sensor float 10s changes in the forward downward direction, the more the fulcrum P2
The distance from the contact to the front end of the contact surface becomes large, and the sensor float 10s is easily swung upward by a contact load smaller than before the adjustment. Also, the more the sensor float 10s changes in the forward downward direction when the control is neutral, the more the spring 78
, That is, the sensor load is reduced, and the reference posture of the sensor float 10s and the sensor load are changed and adjusted by the sensitivity adjusting lever 71 as follows.

The sensitivity adjusting lever 71 is mounted on a bracket 72a connected to the lever guide 72 so as to swing back and forth around a fulcrum a, and is engaged with a notched guide groove 72b formed on the lever guide 72. The sensitivity can be adjusted in seven stages. The control valve side end of the outer wire 77b of the release wire 77 that links the sensor float 10s and the operation arm 66a of the control valve 66 is supported by the sensitivity adjustment lever 71, and the sensitivity adjustment lever 71 swings back and forth. Accordingly, the position of the end of the outer wire 77b is adjusted in the longitudinal direction of the wire. Here, when the end of the outer wire 77b is adjusted to be displaced away from the control valve 66, the inner wire protrusion length on the float side is reduced by that amount, and the attitude of the sensor float 10s at the time of control neutral is lowered in the forward direction. And the control sensitivity becomes sensitive as described above. Conversely, when the end of the outer wire is displaced toward the control valve 66, the inner wire protrusion length on the float side increases by that amount, and the attitude of the sensor float 10s at the time of control neutral changes in the upward direction. As described above, the control sensitivity becomes insensitive. Therefore, the sensitivity adjustment lever 71 is adjusted in seven steps by judging the muddy hardness so that the softer the muddyness of the field is, the more sensitive the elevating control is.

The lever guide 72 is attached to the body cover 21.
The body cover 21 can be removed while maintaining the lever guide 72 during maintenance of the body. Here, the lever guide 72 has its lever guide surface provided so as to be inclined downward and outward, and while increasing the width of the lever guide surface in plan view, increasing the substantial width of the lever guide surface. I'm using

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding rice transplanter.

FIG. 2 is a plan view of the body frame structure.

FIG. 3 is a side view of a front part of the aircraft.

FIG. 4 is a side view of the rear part of the fuselage.

FIG. 5 is a front view of the front part of the aircraft.

FIG. 6 is a vertical cross-sectional front view of a front and rear intermediate portion of the aircraft.

FIG. 7 is a partially cutaway perspective view of an airframe cover.

FIG. 8 is a perspective view of a front part of the fuselage.

FIG. 9 is a cross-sectional view showing a structure for mounting the seat mounting support bracket to the body cover.

FIG. 10 is a longitudinal sectional side view showing an attachment structure of the body cover to the body frame.

FIG. 11 is a plan view of the body frame structure.

FIG. 12 is a perspective view around the front frame.

FIG. 13 is a perspective view of a body frame.

FIG. 14 is an exploded perspective view showing the configuration of one main frame.

FIG. 15 is a side view of the main frame.

16 is a sectional view taken along line aa in FIG.

17 is a sectional view taken along line bb in FIG.

18 is a sectional view taken along line cc in FIG.

FIG. 19 is a side view of a control valve operation unit.

FIG. 20 is a configuration diagram of a lifting control mechanism.

[Explanation of symbols]

 5 Seedling planting device 10s Sensor float 11 Body frame 21 Body cover 70 Lifting / lowering operation-72 Lever guide 73 Opening

Claims (3)

[Claims] 1. A control means for controlling the raising and lowering of a seedling planting device connected to a rear part of a machine body based on a vertical displacement detection result of a sensor float, and an elevating operation lever for artificially raising and lowering the seedling planting device; What is claimed is: 1. A riding type rice transplanter having control sensitivity adjusting means for mechanically adjusting an operation sensitivity of a float, wherein an adjusting operation section of the control sensitivity adjusting means is mounted on a lever guide of the lifting operation lever. Characteristic riding rice transplanter. 2. An opening is formed in a portion of the fuselage cover detachable from above with respect to the fuselage frame on the side of the seat, and the lever guide is connected to the fuselage frame in a state where the lever guide faces the opening. 2. The riding type rice transplanter according to claim 1, wherein the body cover is detachable while leaving the guide. 3. The riding type rice transplanter according to claim 2, wherein the upper surface of the lever guide is formed as an outwardly inclined surface.