JP2002051621A - Paddy working machine - Google Patents

Abstract

(57) [Problem] To provide a descent-preventing structure capable of preventing a working device from being lowered due to a leak of hydraulic oil even when a link mechanism is configured to be a lifting type while simplifying the configuration. To do. SOLUTION: In a paddy working machine in which a working device 4 is connected to a rear portion of a traveling machine body 1 via a link mechanism 3 which moves up and down by operating a hydraulic cylinder 2 so as to be able to move up and down, a single-acting hydraulic cylinder 2 is used. And a lowering prevention position for engaging the cylinder tube 2A of the hydraulic cylinder 2 with the engaging portion 2a formed on the piston 2C to prevent the working device 4 from lowering from the upper limit position. A locking member 41 is provided which can be moved out and back over a lowering allowable position which allows the working device 4 to be lowered from the upper limit position by detaching from the working device 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paddy field working machine in which a working device is connected to a rear portion of a traveling machine body via a link mechanism which moves up and down by operating a hydraulic cylinder so as to be able to move up and down.

[0002]

2. Description of the Related Art [First Prior Art] In the above-described paddy working machine, as disclosed in, for example, JP-A-8-308342, a link mechanism is of a push-up type in which the link mechanism is raised by extension operation of a hydraulic cylinder. Make up,
There is a device equipped with a detachable lock member that enables interposition between the cylinder tube of the hydraulic cylinder and the receiving member on the piston rod side when the working device is raised to the upper limit position. In a paddy field working machine, this lock member is interposed between the cylinder tube of the hydraulic cylinder and the receiving member on the piston rod side, so that the work device can be transported by truck with its ascended position to the upper limit position, a barn, etc. During long-term storage of the work equipment, it is possible to prevent the work equipment from coming into contact with other objects and being damaged due to the lowering of the work equipment caused by the leakage of the hydraulic oil.

[Second Prior Art] The above-mentioned paddy field working machine has a mid-mount fertilization specification in which a fertilizer is mounted on the rear part of a traveling machine body as disclosed in, for example, Japanese Patent Application Laid-Open No. 11-75430. Some have been
Conventionally, even in such a paddy working machine of the mid-mounting fertilization specification, a link mechanism employed in other non-fertilizing specification paddy working machines that are not equipped with a fertilizing device has been adopted.

[Third Prior Art] In the paddy working machine described above, as disclosed in, for example, Japanese Patent Application Laid-Open No. H11-75430, the working device is divided into a left working section and a right working section. The posture is switched between a working posture in which the left and right working units are connected in a workable forward posture, and a storage posture in which the left and right working units are divided into left and right working units and their divided ends are displaced rearward and changed to a lateral posture. Be configured as possible,
There is a mid-mount fertilization type that can switch the posture of the working device by mounting a fertilizer device on the rear part of the traveling machine. The fertilizer hose that extends from the fertilizer device to the work device is the same length as the fertilizer hose that is used for the mid-mount fertilizer type paddy machine that cannot switch the posture of the work device. I was trying to adopt the one that was.

[0005]

[Problem to be Solved by the Invention] By the way, when the link mechanism is constructed in a push-up manner as in the above-mentioned first prior art, its structure is
Since the load of the working device acts as a compressive force on the hydraulic cylinder in the extended state, it is necessary to configure the hydraulic cylinder with a buckling strength high enough to withstand the compressive force. As a result, the hydraulic cylinder becomes larger and heavier.

Therefore, in recent years, the link mechanism has been configured to be a lifting type in which the hydraulic mechanism is raised by a shortening operation of the hydraulic cylinder so that the load of the working device or the like does not act as a compressive force on the hydraulic cylinder in an extended state. In order to reduce the weight, in this configuration, the lock member is interposed between the cylinder tube of the hydraulic cylinder and the receiving member on the piston rod side as in the first related art described above. Therefore, it is not possible to prevent the working device from lowering due to the leakage of the hydraulic oil, and thus it is necessary to devise a new descent prevention structure.

When the lock member is detachable as in the first prior art, a storage structure for storing the lock member at a predetermined position so as not to be lost when the lock member is not used. This necessitates the inconvenience of complicating the configuration.

[Regarding the second prior art]
According to the prior art, among a plurality of fertilizer hoses extending from the fertilizer device to the working device, the fertilizer device side of the fertilizer hose connected to the left and right central sides of the fertilizer device is substantially the same as the top link in the link mechanism. The top link of the link mechanism comes closer to the fertilizer and interferes with the fertilizer side of the fertilizer hose located on the left and right center side as the working device is raised, Since the end of the fertilizer hose on the side of the fertilizer is bent when the work equipment is raised, the fertilizer hose located at the left and right center side is damaged earlier than other fertilizer hoses. It was easy to invite.

[Third Prior Art]
According to the prior art, when the working device is switched to the storage position, the divided ends of the left and right working units are displaced rearward and away from the fertilizer application device, and are extended toward the divided ends. The fertilizer hose does not reach the work equipment, so when switching the work equipment from the working position to the retracted position, it is necessary to perform the work of disconnecting the fertilizer hose. When switching from the working posture to the working posture, it is necessary to perform the connection work of the fertilizer hose, which makes the work of switching the posture of the working device cumbersome. The problem of water infiltration was caused.

Therefore, by increasing the length of the fertilizing hose extending toward the divided ends of the left and right working sections, the working device can be switched to the storage position without disconnecting the fertilizing hose. Is possible, but in this case,
Since the length of the fertilizing hose differs depending on the arrangement position, there is a problem that the supply timing of the fertilizer supplied to the field via each fertilizing hose differs.

In order to avoid the above-mentioned inconveniences, the length of the fertilizer hose extending to other than the divided ends is the same as that of the fertilizer hose extending to the divided ends of the left and right working parts. May be longer, but in this case,
The fertilizer hose, which has been lengthened in order to match the fertilizer supply timing, has a large overhang, which causes inconveniences such as deterioration of appearance and easy catching by other objects.

A first object of the present invention is to provide a descent prevention structure capable of preventing a working device from being lowered due to a leak of hydraulic oil even when the link mechanism is configured to be a lifting type, while simplifying the configuration. The second object is to prevent the fertilizer hose located on the left and right center side from being damaged earlier than other fertilizer hoses, and the third object is to provide In addition, it is possible to easily change the posture of the working equipment without inconvenience such as different fertilizer supply timings and new inconveniences such as the fertilizer hose being easily caught by other objects. To avoid the inconvenience of infiltration of water into the inside.

[0013]

Means for Solving the Problems [Structure] In order to achieve the first object, in the invention according to the first aspect of the present invention, the traveling body is vertically moved and oscillated by operating a hydraulic cylinder. In a paddy field working machine in which a working device is vertically connected via a link mechanism, a single-acting hydraulic cylinder is employed as the hydraulic cylinder, and a cylinder tube of the hydraulic cylinder is provided with an engaging portion formed on a piston. Engagement and retraction between a lowering prevention position for preventing the working device from lowering from the upper limit position and a lowering allowable position for disengaging from the engaging portion and allowing the lowering of the working device from the upper limit position. Equipped with an operable locking member.

According to the first aspect of the present invention, when the link mechanism is configured to be of a push-up type which rises by the extension operation of the hydraulic cylinder, the working device is in the extended state of the hydraulic cylinder reaching the upper limit position. So that the locking member can be engaged with the engagement portion of the piston,
In the case where the link mechanism is configured to be of a pull-up type in which the hydraulic cylinder is raised by a shortening operation of the hydraulic cylinder, the locking member is engaged with the engaging portion of the piston when the working device reaches the upper limit position in the shortened state of the hydraulic cylinder. So that
If the engaging portion is formed on the piston and the locking member is provided on the cylinder tube, the locking member can be engaged regardless of whether the link mechanism is configured as a push-up type or a pull-up type. Engagement with the part prevents the hydraulic cylinder from expanding and contracting due to hydraulic oil leaks, so that the working device can be reliably maintained at the upper limit position. By disengaging the member from the engagement portion, the hydraulic cylinder can be extended and contracted by switching the flow state of the hydraulic oil with respect to the hydraulic cylinder, and the working device can be moved up and down to a desired position.

That is, the working device is raised to the upper limit position irrespective of the structure of the link mechanism by making a simple improvement by simply changing the arrangement of the locking members in the cylinder tube according to the structure of the link mechanism. In this case, the working device can be easily moved by truck operation or long-term storage in a barn, etc., when the working device descends due to hydraulic oil leak. The possibility of damage due to contact with another object can be avoided.

Further, for example, when the locking member is configured to be detachable similar to the above-described locking member of the first prior art, when the locking member is detached from the engaging portion and not in use, the locking member is not used. Although it is necessary to configure a storage structure for storing at a predetermined position so as not to lose the lock member, in the invention according to claim 1, the lock member is provided on the cylinder tube so that the lock member can be extended and retracted. Since there is no risk of losing the locking member when the device is not used, it is not necessary to newly configure a storage structure for storing the locking member without losing it, so that the configuration can be simplified accordingly. Become.

[Effect] Therefore, while simplifying the structure, the work can be performed in both the case where the link mechanism is constituted by the push-up type and the case where the link mechanism is constituted by the pull-up type only by changing the arrangement of the locking members. The work equipment can be prevented from lowering due to hydraulic oil leakage when transporting by truck with the equipment raised to the upper limit position or during long-term storage in a barn, and other objects caused by the lowering It has become possible to provide a descent prevention structure capable of avoiding the possibility that the working device may be damaged by contact with the device.

[Structure] In order to achieve the second object,
According to a second aspect of the present invention, in the paddy field working machine, a working device is connected to a rear portion of the running machine body via a link mechanism that moves up and down by operating a hydraulic cylinder so as to be able to move up and down. A fertilizer device is mounted on the rear part of the fuselage, and the top link of the link mechanism is inserted into the fertilizer hose located at the left and right center side of a plurality of fertilizer hoses extending from the fertilizer device toward the working device. A hollow structure having a pair of left and right arm members arranged side by side at an interval that allows

According to the second aspect of the present invention, when the top link of the link mechanism approaches the fertilizer application device with the rise of the working device, the fertilizer application side of the fertilizer hose located at the left and right center sides is moved to the right side. Since it enters between the left and right arm members of the top link configured in the hollow structure, it is possible to avoid that the top link of the link mechanism interferes with the fertilizer application device side of the fertilizer hose when the working device is raised, It is possible to prevent the fertilizer hose located at the left and right center side from being bent due to the interference, thereby preventing inconvenience such as bending, so that the fertilizer hose located at the left and right center side is compared with other fertilizer hoses. As a result, the inconvenience of early damage can be eliminated.

[Effect] Therefore, the fertilizer hoses located at the left and right center sides can be made highly reliable for a long period of time, like other fertilizer hoses.

[Structure] In order to achieve the third object,
According to the third aspect of the present invention, in the paddy field working machine, a working device is connected to a rear portion of the traveling machine body via a link mechanism that moves up and down by operating a hydraulic cylinder so as to be able to move up and down. A fertilizer device is mounted at the rear of the fuselage, and the working device is configured to be splittable into a left working unit and a right working unit, and each of the left and right working units is configured to be swingable about a vertical axis. The working device is changed to a working posture in which the left and right working units are connected in a workable forward posture and a lateral posture in which the working device is divided into the left and right working units and their divided ends are displaced rearward. The front and rear intermediate portions of a plurality of fertilizing hoses extending from the fertilizer to the left and right working sections are gathered and bundled at the left and right intermediate positions of the working device. Was.

According to the third aspect of the present invention, the front and rear intermediate portions of a plurality of fertilizing hoses extending from the fertilizer to the left and right working portions are gathered and bundled at the left and right intermediate positions of the working device. Thereby, as the fertilizing hoses of the left and right central sides extending toward the divided ends of the left and right working units, the working device can be switched to the storage position without disconnecting the hoses. The length of the fertilizer hoses on the left and right sides, as well as the fertilizer hoses on the left and right sides, should be the same as the fertilizer hoses on the left and right sides to match the fertilizer supply timing. However, the fertilizing hoses on both the left and right sides have the middle part in the front and rear and are centered on the left and right sides to suppress the outward protrusion, so the appearance of these fertilizing hoses is greatly extended. It becomes possible to avoid the occurrence of inconvenience such easily caught underneath and other products.

[Effect] Therefore, it is possible to adopt a fertilizing hose having a long length without causing any new inconveniences such as deterioration in appearance due to the overhang of the fertilizing hose and easy catching by other objects. This eliminates the trouble of attaching and detaching the fertilizer hose every time the posture of the work equipment is changed, so that the work of changing the posture of the work equipment can be facilitated, and the leakage of fertilizer caused by disconnecting the fertilizer hose. It is now possible to prevent water from getting out or into the fertilizer hose.

[0024]

1 and 2 show an overall side view of a riding type rice transplanter which is an example of a paddy field working machine. This rice transplanting machine is a rear part of a traveling body 1 configured as a riding type. In addition, a seedling planting device 4 for 10-row planting, which is an example of a working device, is connected to be able to move up and down freely via a link mechanism 3 that moves up and down and swings by the operation of a single-acting hydraulic cylinder 2. By mounting the fertilizer application device 5, it is configured as a mid-mount fertilizer specification of 10 rows.

The traveling body 1 is of a four-wheel drive type that transmits traveling power from a prime mover 6 disposed at a front portion thereof to left and right front wheels 7 and a rear wheel 8. A boarding operation unit 11 including a steering wheel 9 and a driver's seat 10 operatively linked to the left and right front wheels 7 is formed.

In the seedling planting apparatus 4, while the four ground leveling floats 12 preliminarily level the seedling planting places with the traveling of the machine body, the working power from the prime mover 6 is transmitted to the left and right feed cases 13, With the distribution power from the feed case 13, the seedling mounting table 14 on which ten rows of mat-like seedlings can be mounted is reciprocated at a constant stroke in the left-right direction, and ten rotary planting mechanisms 15 are provided. However, it is configured to perform a planting operation of taking out a predetermined amount of seedlings from the lower end of the seedling mounting table 14 and planting them in a field.

Also, as shown in FIGS.
Can be divided into two parts, a left planting part 4A as a left working part capable of planting four rows and a right planting part 4B as a right working part capable of planting six rows, and these can be divided into two parts. Each of the planting portions 4A and 4B is configured to be swingable around the first vertical axis P1 and the second vertical axis P2, whereby the left and right planting portions 4A and 4B can be operated in the forward posture. And a storage posture for dividing the planting parts 4A and 4B into left and right and displacing the divided ends toward the rear to reduce the amount of overhang to the lateral outside of the aircraft. The attitude can be switched between.

Incidentally, the seedling planting device 4 is configured such that the front end in the storage position is located above the rear wheel 8 so that the total length thereof is as short as possible even when the device is switched to the storage position. . For this reason, the upper limit position of the seedling planting device 4 is set at a height position at which the contact with the rear wheel 8 such as the leveling float 12 that is located at the front end when the seedling planting device 4 is switched to the storage position can be avoided. The attitude switching operation of the seedling planting apparatus 4 is performed with the seedling planting apparatus 4 raised to the upper limit position.

Reference numeral 16 shown in FIGS. 4 and 5 denotes a fixed frame connected to the rear end of the link mechanism 3, and reference numeral 17 denotes a first vertical axis P1 at both left and right ends of the fixed frame 16.
This is a swing frame that is swingably supported around and has planted portions 4A and 4B corresponding to the free ends thereof swingably connected around the second longitudinal axis P2.

As shown in FIGS. 1 to 3, the fertilizer applicator 5 includes a total of ten groove creators 18 mounted on each of the leveling floats 12 along with the running of the airframe, while the fertilizer application grooves are formed. The five feeding mechanisms 19 feed the fertilizer in the fertilizer hopper 20 by a predetermined amount with the working power from 6 and the fertilizer fed by each feeding mechanism 19 by the operation of the electric fertilizer fan 21 to each fertilizing hose 22. The fertilizer is buried in the lateral side of the planted seedling in the field by pumping it toward the corresponding groove producing device 18 via the.

As shown in FIGS. 1 to 3 and FIG.
Is a front frame 25 extending forward from the transmission case 24 by connecting a transmission case 24 to the front ends of a pair of left and right main frames 23 disposed in the front-rear direction.
In addition, a water-cooled three-cylinder diesel engine 26 is mounted and supported with its output shaft 26a facing left and right, and an electric cooling fan 28 is provided between the engine 26 and a handle post 27 standing upright behind the engine 26. A radiator 29 having a front-rear direction is provided, and a hydrostatic stepless transmission 30 is mounted on the left side of the transmission case 24 located behind the radiator 29 in a posture in which the input shaft 30a is directed left and right. The output shaft 26a of the engine 26 and the input shaft 30a of the hydrostatic continuously variable transmission 30 are connected by a belt-type transmission mechanism 31.
, So as to be able to transmit through the transmission.

That is, the three-cylinder large engine 26 whose length in the output shaft extending direction is longer than the length in the direction perpendicular to the output shaft.
Is mounted on the front part of the traveling body 1 with its longitudinal direction oriented left and right, so that it is formed on the front part of the traveling body 1 as compared with the case where the longitudinal direction is mounted longitudinally. The front-rear length of the prime mover 6 can be shortened, and the visibility of the work area below the front of the fuselage from the boarding / driving unit 11 can be improved. It can be improved.
In addition, since the front-rear length of the driving unit 6 is shortened, the total length of the body can be shortened, so that a turning space (a headland in a field) required for turning the body can be reduced.

As shown in FIG. 7, the transmission from the prime mover 6 to the seedling planting device 4 is performed by the output shaft 24a of the transmission case 24.
A first transmission shaft 33 that is connected to the first transmission shaft 32 through a first universal joint 32 and has a rearwardly inclined position, and a second transmission that is connected to the first transmission shaft 33 via a second universal joint 34 so as to be vertically swingable. Shaft 35 and this second transmission shaft 35 to the right feed case 1
3 is connected to an input shaft 13a of a power distribution unit 13A connected to the third universal joint 36 so as to be vertically swingable.

According to this configuration, when the second universal joint 34 serving as the swing fulcrum of the second transmission shaft 35 is higher than the output shaft 24a of the transmission case 24, the seedling planting device 4 is switched to the retracted position. Of the seedling planting apparatus 4 in which the upper limit position is set at a height position at which the contact between the leveling float 12 and the rear wheel 8 can be avoided. In addition, the bending angle of the second universal joint 34 that changes as the seedling planting device 4 moves up and down can be reduced, so that durability can be improved and noise can be suppressed.

As shown in FIGS. 7 to 9, the link mechanism 3
A top link 3A and a pair of left and right lower links 3B that are vertically oscillatably connected to a support bracket 37 erected at the rear part of each of the left and right main frames 23 via a vertical fulcrum shaft 38, The end of the hydraulic cylinder 2 is configured as a quadruple link with a vertical link 3C pivotally connected to the end via a pivot shaft 39. In the hydraulic cylinder 2, the cylinder tube 2A can relatively swing with respect to the swing fulcrum shaft 38 of the top link 3A. And the piston rod 2B is pivotally connected to the pivot 39 of the lower link 3B via the suspension mechanism 40 so that the link mechanism 3 is raised and rocked by the shortening operation. Have been.

As shown in FIGS. 9 to 11, the swinging fulcrum of the cylinder tube 2A is engaged with an engaging portion 2a formed of a ring groove formed on the peripheral surface of the piston 2C.
The upper and lower sides can be moved up and down between a lowering prevention position for preventing the lowering from the upper limit position and a lowering allowable position for disengaging from the engaging portion 2a and allowing the seedling planting device 4 to lower from the upper limit position. A pair of pin-shaped locking members 41 are provided, and these locking members 41 are connected with the link 42 and the link wire 4.
It is linked to an operation lever 44 provided in the boarding operation unit 11 via a member 3 or the like.

With this configuration, when the seedling planting device 4 reaches the upper limit position and the hydraulic cylinder 2 is shortened, the locking member 4
By engaging 1 with the engaging portion 2a, the extension operation of the hydraulic cylinder 2 due to the leakage of hydraulic oil can be prevented, and the seedling planting apparatus 4 can be reliably maintained at the upper limit position. The seedling planting device 4
Is raised to the upper limit position and is switched to the storage position, for example, during transportation by truck or during long-term storage in a barn, when the seedling planting device 4 descends due to the leakage of hydraulic oil, causing the seedling planting device 4 to fall. The possibility of damage due to contact with another object such as the rear wheel 8 can be avoided. Naturally, when the locking member 41 is disengaged from the engaging portion 2a, the first lifting lever 45 and the second lifting lever 46 (see FIGS. By switching the flow state of the hydraulic oil to the hydraulic cylinder 2 based on the operation,
The hydraulic cylinder 2 can be expanded and contracted, whereby the seedling planting apparatus 4 can be moved up and down to a desired position.

As shown in FIG. 8, FIG. 9, FIG. 12, and FIG. 13, the top link 3A of the link mechanism 3 comprises a pair of left and right arm members 3a made of channel steel or square pipe material. It has a hollow structure connected by a pair of bent front and rear connecting members 3b. Left and right arm members 3a
Is the feeding mechanism 1 provided at the center on the left and right of the fertilizer application device 5
9, the fertilizer application device side is located above the top link 3A. The two fertilizer hoses 22 on the left and right center sides are arranged side by side with an interval that allows entry.

With this configuration, when the top link 3A of the link mechanism 3 approaches the fertilizer applicator 5 as the seedling planter 4 rises, as shown in FIGS. 2, 3, 12, and 13, The fertilizer application side of the two fertilizer hoses 22 located on the left and right central sides enters between the left and right arm members 3a, whereby the top link 3A is connected to the fertilizer hose 22 when the seedling planting device 4 is raised. Interference with the fertilizer device side can be avoided, and the occurrence of inconvenience such as bending of the fertilizer device side ends of the two fertilizer hoses 22 located on the left and right center sides due to the interference can be prevented. The two fertilizing hoses 22 on the side can be prevented from being damaged earlier than the other fertilizing hoses 22.

As shown in FIGS. 1 to 3, FIG. 12 and FIG. 13, each fertilizing hose 22 is provided with the right and left planting sections 4 A, 4 B in accordance with the switching of the seedling planting apparatus 4 to the storage position. Considering that the groove generator 18 located on the dividing end side is separated from the fertilizer applicator 5, the same length regardless of their arrangement position,
A long seedling planting device 4 having a long length that allows the posture switching operation is adopted.
Each time the posture is changed, the labor for attaching and detaching the fertilizing hose 22 can be omitted, and leakage of fertilizer due to disconnection of the fertilizing hose 22 and fertilizing hose 22 can be eliminated.
In addition to avoiding infiltration of water into the inside, the supply timing of the fertilizer can be made substantially coincident.

The fertilizing hoses 22 are bundled in a state where their front and rear middle portions are gathered by the band 47 at the left and right middle positions of the seedling planting apparatus 4, so that the supply timings of the fertilizers substantially coincide with each other. Since the fertilizer hoses 22 on both the left and right sides, which have long lengths, are used to make the front and rear middle portions thereof closer to the left and right central sides, the outward protrusion is suppressed, It is possible to avoid inconveniences such as a drop in appearance due to a large overhang of the fertilizing hose 22 and a tendency to be easily caught by other objects.

Reference numeral 48 shown in FIGS. 4 and 5 denotes a rear fender expansion step which is provided on both the left and right sides of the traveling body 1 in order to expand the step width to the maximum width that can be accommodated in the truck bed. is there. Reference numeral 49 denotes an auxiliary step that is foldably disposed laterally outward of each of the left and right expansion steps 48. At the time of planting work, these auxiliary steps 49 are extended laterally outward of the expansion step 48. The step width can be extended to the vicinity of the left and right widths of the seedling mounting table 14 by switching to the working posture, so that the seedling replenishment work for the left and right ends of the seedling mounting table 14 and the fertilizer for the left and right ends of the fertilizer hopper 20 can be performed. The replenishment operation can be facilitated (see FIG. 4). Conversely, at the time of non-planting operation, the auxiliary step 49 is switched to the storage position folded above the expansion step 48, so that the step width of the traveling body 1 is changed. Can be reduced to a length that fits within the width of the truck bed (see FIG. 5).

[Other Embodiments] Other embodiments of the present invention will be listed below. The paddy field working machine may be a direct sowing machine configured by equipping the traveling body 1 with a direct sowing device as an example of the working device 4. The working device 4 may be configured so as to be capable of performing a multi-step operation such as an 8-step or 12-step operation. The hydraulic cylinder 2 may be of a push-up type that raises and swings the link mechanism 3 by its extension operation. In this case, in the extended state of the hydraulic cylinder 2 in which the working device 4 has been raised to the upper limit position, the cylinder tube 2A is designed so that the engaging member 41 can be engaged with the engaging portion 2a of the piston 2C. The engaging member 41 may be provided at the free end of the above.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding type rice transplanter showing a state where a seedling planting device is positioned at a working height position.

FIG. 2 is an overall side view of a riding type rice transplanter showing a state where a seedling planting device is positioned at an upper limit position.

FIG. 3 is a rear side view of the riding type rice transplanter showing a state in which the seedling planting device is switched to the retracted position.

FIG. 4 is a schematic plan view of a riding type rice transplanter showing a state where a seedling planting device is switched to a working posture.

FIG. 5 is a schematic plan view of the riding type rice transplanter showing a state in which the seedling transplanting device is switched to a retracted posture.

FIG. 6 is a longitudinal sectional side view of a main part showing a configuration of a driving unit.

FIG. 7 is a longitudinal sectional side view of a main part showing a transmission configuration from a prime mover to a seedling planting device.

FIG. 8 is a side view of a main part showing a configuration of a hydraulic cylinder and a link mechanism.

FIG. 9 is a longitudinal sectional side view of a main part showing a configuration of a hydraulic cylinder.

10A is a vertical sectional side view of a hydraulic cylinder showing an ascending and descending allowable state in which a locking member is disengaged from an engagement portion. FIG. 10B is a hydraulic pressure diagram showing a descent preventing state in which the locking member is engaged with the engagement portion. Longitudinal side view of cylinder

FIG. 11 is a longitudinal sectional front view of a main part showing a configuration of a hydraulic cylinder.

FIG. 12 is a schematic plan view of a main part showing a state of a fertilizer hose in a state where the seedling planting device is switched to a working posture.

FIG. 13 is a schematic plan view of a main part showing a state of a fertilizing hose in a state where the seedling planting device is switched to a retracted posture.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling body 2 Hydraulic cylinder 2A Cylinder tube 2C Piston 2a Engagement part 3 Link mechanism 3A Top link 3a Arm member 4 Working device 4A Left working part 4B Right working part 5 Fertilizer 22 Fertilizing hose 41 Locking member P1 Vertical axis P2 Vertical axis

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A01B 73/02 A01B 73/02 2B304 A01C 11/00 302 A01C 11/00 302 15/00 15/00 F F Terms (Reference) 2B041 AA06 AA15 AB05 AC06 BA08 CA03 CA17 CC01 2B052 BC05 BC16 EC03 2B060 AA01 AC03 BA04 BA09 BB09 CB02 2B062 AA20 AB01 AB07 BA60 BA62 BA72 2B064 AA05 AA07 AB01 AC01 BA10 2B304 KA05 MB06 MC06 RA09 RA12

Claims (3)

[Claims] 1. A paddy working machine in which a working device is connected to a rear portion of a traveling machine body via a link mechanism that moves up and down by operating a hydraulic cylinder so as to be able to move up and down, wherein the hydraulic cylinder is a single-acting type. A lowering prevention position for engaging the engaging portion formed on the piston with the cylinder tube of the hydraulic cylinder to prevent the working device from lowering from the upper limit position, and disengaging from the engaging portion. A paddy field working machine equipped with a locking member that can be moved back and forth over a lowering allowable position that allows the lowering of the working device from an upper limit position. 2. A paddy working machine having a working device connected to a rear portion of a traveling machine body via a link mechanism that moves up and down by operating a hydraulic cylinder so as to be able to move up and down, wherein a fertilizer device is provided at a rear portion of the traveling machine body. Along with mounting, the top link of the link mechanism is separated from the fertilizer by a gap allowing the entry of a fertilizer hose located on the left and right center side of a plurality of fertilizer hoses extending toward the working device. A paddy field working machine having a hollow structure including a pair of left and right arm members arranged side by side. 3. A paddy field working machine in which a working device is connected to a rear portion of the traveling machine body via a link mechanism that moves up and down by operating a hydraulic cylinder so as to be able to move up and down, and a fertilizer application device is provided at a rear portion of the traveling machine body. And the working device can be divided into two parts, a left working part and a right working part,
A left and right working unit configured to be swingable about a vertical axis, and a working posture for connecting the working device with the left and right working units in a workable forward posture; and a left and right working unit. Into a storage position that is changed to a lateral position in which those divided ends are displaced rearward and are configured to be switchable, and a plurality of extending from the fertilizer device toward the left and right working units are configured. A paddy working machine in which front and rear intermediate portions of a fertilizing hose are gathered and bundled at right and left intermediate positions of the working device.