JP3374051B2 - Rice transplanter seedling plant raising and lowering operation structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seedling planting device connected to a traveling machine body by a hydraulic cylinder via a link mechanism that can be moved up and down, and the seedling planting device comprises a pair of left and right divided seedling planting device parts. The split seedling planting device parts are connected to the link mechanism in a horizontal posture along the lateral direction of the traveling machine body and the link mechanism in a front-back posture along the longitudinal direction of the traveling machine body. The present invention relates to a raising / lowering operation structure of a seedling planting device for a rice transplanter, which is configured to be switchable between a folded storage state and a stored state.

[0002]

2. Description of the Related Art In the above rice transplanter, it is better to configure the seedling planting device that has been switched to the retracted state so as to connect to the traveling machine body as much as possible when moving the rice transplanter or loading it on a carrier vehicle. It is advantageous that the overall length of the airframe is short and it is easy to drive and that it is hard to stick out from the cargo bed. However,
In this case, if the weight of the seedling planting device, etc. is applied to the hydraulic cylinder and an oil leak occurs in the control valve of the hydraulic cylinder, the seedling planting device descends from the stored height and its end hits the wheel of the traveling machine body. The trouble of may occur. Therefore, conventionally, as shown in, for example, Japanese Patent Laid-Open No. 9-74837, when the seedling planting device is put in the retracted state, it is provided between the spring receiver connected to the piston rod of the hydraulic cylinder and the cylinder tube. By sandwiching the fall prevention member and applying a stopper to prevent shortening on the hydraulic cylinder,
There was one that prevented the seedling planting device from falling from the storage level. Also, for example, Japanese Patent Laid-Open No. 8-3
As disclosed in Japanese Patent No. 31949, when the hydraulic cylinder is extended and driven to raise the seedling planting device to the storage level,
The free end side of the stopper, which is swingably supported by the spring cover fixed to the piston rod of the hydraulic cylinder, locks on the upper end surface of the cylinder tube, and the hydraulic cylinder is locked by the stopper to prevent shortening, and the seedling planting device is removed from the storage level. Some were able to prevent falling. In this structure, an electromagnetic solenoid that connects the stopper and the spring cover is used to swing and release the stopper so that the free end side comes off the cylinder tube.

[0003]

In the case of the former of the conventional fall prevention techniques, when the seedling planting device is stored or used, it is troublesome to attach or remove the fall prevention member. It was hanging. In the latter case, the stopper is provided so as to be switchable between the working posture and the releasing posture by the electromagnetic solenoid, which is disadvantageous in terms of structure and the like. An object of the present invention is to advantageously obtain a seedling planting device that can be stored while preventing it from falling, both in terms of operation and structure.

[0004]

The constitution, action and effect of the invention according to claim 1 are as follows.

[Structure] The seedling planting device is connected to a traveling machine body by a hydraulic cylinder via a link mechanism that can be operated to move up and down.
It is configured to be split into a pair of left and right split seedling planting device parts, and both split seedling planting device parts are connected to the link mechanism in a horizontal posture along the lateral direction of the traveling body, and in the longitudinal direction of the traveling body. In a seedling planting device elevating and lowering structure of a rice transplanter that is configured to be switchable between a folding and retracted state in which it is connected to a link mechanism in a front-back posture, the hydraulic cylinder is configured to drain oil by the weight of the seedling planting device. A drop prevention valve that can be switched between a fall prevention state in which the check valve acts so as to prevent it and an operation state in which the check valve releases the action is connected to the hydraulic cylinder, and
A connection state in which the seedling planting device can work, and the seedling
Switch to a detached state that allows folding and storage of the planting device
An operation freely apparatus, said switching operations freely apparatus
When switching operation is performed to the connected state, the fall prevention valve
Switch to the above-mentioned operation state,
When the switch is operated to switch to the separated state, the fall prevention valve
To switch to the fall prevention state.
An operable device is linked to the fall prevention valve.

[Operation] Even when the fall prevention valve is configured to be switched by a dedicated operation, it is configured to be switched at once by a switching operation of another device such as the clutch device of the seedling planting device. Also, when the seedling planting device is put in the retracted state, it is switched to the fall prevention state. Then, even if the seedling planting device is heavy on the hydraulic cylinder, the check valve prevents oil from escaping from the hydraulic cylinder as in the case of oil leaking from the control valve, and the seedling planting device falls from the storage level. Disappear. When performing work, the fall prevention valve is switched to the operating state. Then, the check valve is released and the control valve can operate the hydraulic cylinder. Then, in order to perform work with the seedling planting device,
This switching operation is performed when the device is switched to the connected state.
Depending on the cropping operation, the fall prevention valve switches to the operating state,
To store the attached device, switch the device to the separated state
If this is made, the fall prevention valve will drop due to this switching operation.
Switch to preventive state.

[Effect] Even when the seedling planting device is configured to be stored as close as possible to the traveling machine body, it is possible to store the seedling planting device while ensuring that the fall prevention valve does not cause a trouble such as hitting a wheel. In addition, the fall prevention at the time of storage and the ascending / descending operation state at the time of work can be easily performed by simply switching the fall prevention valve. A relatively simple structure in which a fall prevention valve is provided in the hydraulic circuit of the hydraulic cylinder is sufficient, and the structure is relatively inexpensive. In addition, the device and fall prevention valve
And switch to the specified state all at once to operate the seedling planting device.
The state of storing it while preventing it from falling can also be used for the work of the seedling planting device.
It is easy to operate even when the
It will be easier to operate.

[0008]

[0009]

[0010]

[0011]

The structure, operation, and effect of the invention according to claim 2 are as follows.

[Structure] In the structure of the invention according to claim 1 , the switching operation can be freely performed.
Such a device is a clutch device that detachably connects the input member of each of the pair of left and right split seedling planting device portions to the power take-out portion.

[Operation] When the clutch device is switched to the connected state in order to enable the driving of the seedling planting device, the fall prevention valve is switched to the operating state by this switching operation, and the seedling planting device is stored. When the clutch device is switched to the disengaged state, the switching operation switches the fall prevention valve to the fall prevention state.

[Effect] Even when the clutch device and the fall prevention valve are switched to a predetermined state at a time to store the seedling planting device while preventing the planting device from falling, the work and lifting operation of the seedling planting device are possible. As the state is easy to operate, it becomes easier to operate.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a pair of left and right front and rear wheels 1 and 1 which can be freely driven and a pair of left and right rear wheels 2 and 2 which can be freely driven are self-propelled to drive an engine bonnet. A hydraulic lift cylinder 5 is used to move up and down through a link mechanism 6 that swings up and down by a hydraulic lift cylinder 5 at the rear part of a traveling machine body including a spare seedling stand 3 located on both sides and a driver's seat 4 located at the rear part of the machine body. As described above, the riding type rice transplanter is configured by connecting the seedling planting devices 10 and transmitting power from the traveling machine body to the seedling planting devices 10 by the rotating shaft 7.

The seedling planting device 10 is constructed as shown in FIGS. That is, one end is connected to the left end of the traveling machine body of the planting device connecting member 6a located on the free end side of the link mechanism 6, and the bracket portion 12a is connected to the other end of the connecting link 11. The connecting link 11 together with the main frame 12 by connecting to the main frame 12 and the bracket portion 12a.
A plurality of planting drive cases 14, the front end side of which is connected to the rear side of the main frame 12 aligned in the longitudinal direction of the input case 13 and the main frame 12, and the plurality of planting drives from the input case 13. Case 14,
Each of the transmission cases 15 for transmitting power to 14 constitutes a left side body part of the seedling planting device 10, and one end side is connected to an end part on the right side of the traveling body of the planting device connecting member 6a. The main frame 12 in which the bracket portion 12a is connected to the other end side of the connection link 11,
The input case 13 is connected to the connecting link 11 together with the main frame 12 by being connected to the bracket portion 12a, and the front end side is connected to the rear side surface of the main frame 12 aligned in the longitudinal direction of the main frame 12. Each of the planting drive case 14 and the transmission case 15 for transmitting power from the input case 13 to the plurality of planting drive cases 14, 14 constitutes a right side body part of the seedling planting device 10, and the right side body part and the left side The planting machine of the whole seedling planting device is constituted by the machine body part.

The plurality of planting drive cases 14, 14
The seedling planting mechanism 16 is drivably attached to both lateral sides of the rear end of some of the planting drive cases 14, 14 and one lateral side of the rear end of the remaining planting drive cases 14, The seedling placing table 12 is slid across the seedling placing table guide rails 17 supported over all the planting drive cases 14 and the seedling placing table columns (not shown) which are erected on the bracket portions 12a of the left and right body parts. A plurality of leveling floats 19 aligned in the lateral direction of the machine body are supported below the left side body section and the right side body section, respectively.

Each seedling planting mechanism 16 includes a planting drive case 1
4 is rotatably supported by a rotating case 16a and both ends of the rotating case 16a are rotatably supported by a planting arm 116b. As the rotating case 16a is driven, a pair of planting arms 16b, 16b are formed. It revolves around the rotation axis of the rotation case 16a with respect to the planting drive case 14, and rotates about the rotation case 16a by the action of a planting arm drive mechanism (not shown) provided in the rotation case 16a. The seedling planting claw provided on one planting arm 16b and the seedling planting claw provided on the other planting arm 16b are alternately passed through the seedling take-out port formed by the notch of the seedling platform guide rail 17. Perform a seedling planting movement that rotates up and down to cut one block of seedlings from the mat-shaped seedlings placed on the seedling placing table 18 and It is configured to instill brought to the mud section.

The seedling table horizontal feed shaft 20 is rotatably supported by the input case 13 on the left side machine body, and one end side is engaged with the spiral groove of the seedling table horizontal feed shaft 20. The other end of the seedling table horizontal feed rod 21, which is reciprocally transferred by the shaft 20, is connected to the lateral one end of the seedling table 18. As a result, the seedling mounting table 18 is moved to each seedling planting mechanism 16
Is reciprocally moved along the seedling placing table guide rails 17 in association with the seedling planting movement, and the pair of seedling planting claws of each seedling planting mechanism 16 are sequentially arranged from one lateral side of the lower end portion of the mat-shaped seedling to the other end side. It is possible to cut seedlings into.

As shown in FIGS. 2 and 3, the seedling placing table 18
And the seedling table guide rail 17 is configured to be divided along the dividing line Y into two divided seedling table portions 18a, 18b and divided seedling table guide rail portions 17a, 17b, and the left side body portion and the right side body portion Each of the connecting links 11 is rotated about the vertical axis X1 of the machine body with respect to the bracket portion 12a and about the vertical axis X2 of the machine body with respect to the planting device connecting member 6a. The divided seedling planting device 10 comprises a left divided seedling planting device portion 10a and a right divided seedling planting device portion 1
0b so that it can be divided into two divided seedling planting device portions 10a and 10b, and can be switched between the working state shown in FIGS. 1 and 2 and the folding storage state shown in FIGS. 3 and 4. is there.

That is, the left side body part, the plurality of seedling planting mechanisms 16 supported by the left side body part and the leveling float 19, one of the divided seedling table guide rail parts 17a supported by the left side body part, and one of Split seedling stand part 1
8a by the left side divided seedling planting device portion 10
a, the right side body part, a plurality of seedling planting mechanisms 16 supported by the right side body part and a leveling float 19, and one divided seedling platform guide rail part 17b supported by the right side body part Each of the divided seedling placing table portions 18b constitutes the divided seedling planting device portion 10a on the right side.

As shown in FIG. 2, the left and right connecting links 11 are set in a connecting posture in which they extend laterally of the traveling machine body from the planting device connecting member 6a, and the left and right main frames 12 are arranged behind the connecting links 11. The connecting posture is arranged parallel to the connecting link 11 on the side. Then, the divided seedling planting device portions 10a and 10b are arranged in the direction in which the seedling planting mechanism 16 and the leveling float 19 are arranged in parallel, and the divided seedling platform portions 18a and 18a.
The lateral width direction of 18b is connected to the lateral direction of the traveling body, and the front-back direction of the ground leveling float 19 is connected to the link mechanism 6 in a lateral posture in which the front-back direction is along the front-back direction of the traveling body.
0 is the working state. At this time, the rear end sides of the planting drive cases 14 of the two divided seedling planting device portions 10a and 10b are connected by a connecting rod 22, and the two divided seedling planting device portions 10a and 10b are fixed to a working connection posture. . Then, both split seedling placement table portions 10a and 10b are brought together by a connecting means (not shown) so as to move integrally and extend from the input case 13 of both split seedling planting device portions 10a and 10b. Input shaft 2 as input member
When 3 is connected to the power take-out part 24 which is configured so that the turning force of the rotating shaft 7 is input and is attached to the lower side of the planting device connecting member 6a, the turning force from the traveling machine body is The split seedling planting device portions 10a and 10b can be transmitted to enable seedling planting work by the seedling planting device 10.

As shown in FIGS. 5 and 6, after the left divided seedling placing table portion 18a is moved to the left end side of the seedling placing table guide rail 17, the right divided seedling placing portion 18b is moved to the left side divided seedling placing table. By separating from the portion 18a and moving it to the right end side of the seedling placing table guide rail 17, a gap is formed between the two divided seedling placing table portions 18a and 18b,
Further, the input shafts 23 of the divided seedling planting device portions 10a and 10b are separated from the power take-out portion 24, so that the seedling planting device 10 can be folded and stored. As shown in FIG. 7, in this state, the connecting links 11 of the two divided seedling planting device parts 10a and 10b are connected to the planting device connecting member 6a and the main frame 1.
2, the left and right connecting links 11 are brought into a connecting posture so as to extend rearward from the planting device connecting member 6a as shown in FIG. 3, and the left and right main frames 12 are connected to each other. The connecting posture is arranged on the lateral outside of the parallel to the connecting link 11. Then, the two divided seedling planting device portions 10a and 10b are connected to the seedling planting mechanism 16 and the leveled float 1.
9 side-by-side directions and split seedling platform parts 18a, 18b
The lateral width direction of the vehicle is along the front-back direction of the traveling body, and the front-back direction of the ground leveling float 19 is connected to the link mechanism 6 in a front-back orientation in which the front-back direction is along the lateral direction of the traveling body, and the seedling planting device 10 is in the folded storage state. become.

The input shaft 23 of each of the split seedling planting devices 10a and 10b is configured to be connected to the power take-out part 24 or separated from the power take-out part 24 by a clutch device 25 shown in FIG. I am doing it. That is, an input side clutch body 26 is integrally rotatably provided at an end portion of the input shaft 23 of both split seedling planting devices 10a and 10b, and an output side clutch body 27 having one end side engaged and disengaged with the input side clutch body 26 is provided. , A pair of output shafts 24 included in the power take-out section 24
The clutch device 25 is configured so that the clutch device 25 is attached to each of a and 24a by spline engagement so as to be integrally rotatable and slidable, and is configured to be slidably biased toward the side projecting from the output shaft 24a by the energizing spring 28. There is. An operation link 30 swingably supported by both ends of a mounting rod 29 supported by a transmission case forming the power take-out portion 24.
The output side clutch body 27 is configured to be slidably operated by means of a connecting tool 31 in which a connecting pin 31a is slidably inserted into a long hole on one end side of each operating link 30 and an operating cable 32. A clutch lever 33 connected to the operation links 30, 30 is swingably supported by the planting device connecting member 6a, and the swing operation of the clutch lever 33 switches the clutch device 25 to switch the clutch device 25. The input shaft 23 by the operation
Is connected to the power take-off portion 24, and this connection is released.

That is, as shown in FIG. 9A, the clutch lever 33 is rocked to the entry side to operate the operation cable 32.
Loosen and operate. Then, each operation link 30 swings in the direction in which the free end side of the connecting part 31 of the coupling tool 31 is lowered due to the biasing force of the clutch biasing spring 28, and the output side clutch body 27 is moved to the clutch biasing spring. Output shaft 24 by 28
It is slid toward the front end side of "a" and engaged with the input side clutch body 26 so as to be integrally rotatable. As a result, the clutch device 25 is turned on, and the input shaft 23 of both split seedling planting devices 10a and 10b is connected to the output shaft 24a of the power take-out portion 24 so as to rotate integrally. On the other hand, as shown in FIG. 9B, the cletch lever 33 is pivotally operated to the cut side to pull the operation cable 32. Then, each operation link 30 receives the operating force of the operation cable 32 and thus the connecting device 3
The free end side of the connected one swings in the upward direction,
The output side clutch body 27 is slid toward the base end side of the output shaft 24a against the clutch urging spring 28 so that the input side clutch body 2
Separate from 6. As a result, the clutch device 25 is disengaged, and the input shaft 2 of both split seedling planting devices 10a and 10b is cut off.
3 is separated from the output shaft 24a of the power take-out section 24.

As shown in FIG. 10, a drop prevention valve 36 is provided in a cylinder operation oil passage 35 which connects the lift cylinder 5 and a control valve 34 of this cylinder.

As shown in FIGS. 11 and 12, the cylinder port 3 connected to the supply / discharge port 5a of the lift cylinder 5.
7a, a valve port 37b connected to the cylinder operation oil passage 35, and an oil passage 37 connecting both ports 37a, 37b.
With a valve case 37 that is formed to include c and is connected to the cylinder tube 5b of the lift cylinder 5, and a check valve 38 that is installed in the valve case 37,
The fall prevention valve 36 is configured. Check valve 3
Cam shaft 40 that presses one end side of 8 through a spherical body 39
Rotatably mounted on the valve case 37, and the camshaft 40
The cam shaft 40 is rotationally operated by swinging the switching lever 41 that is integrally rotatably connected to the shaft end protruding from the valve case 37, and when the switching lever 41 is switched to the open position OP, Figure 11
As shown in (a), the peripheral surface portion 40a of the cam shaft 40 is a spherical body 3
Abut on 9. Then, the sphere 39 pushes the check valve 38 away from the cam shaft 40, so that the valve main body formed of the inclined head portion 38a of the check valve 38 causes the valve seat member 4 to move.
The control valve 34 supplies pressure oil to the lift cylinder 5 and the lift cylinder 5 discharges pressure oil to the control valve 34 by operating the oil passage 37 in an open state away from the control valve 34. to enable. On the other hand, the switching lever 41
When the switch is operated to switch to the closed position CL, the recess 40b of the cam shaft 40 corresponds to the sphere 39 as shown in FIG. 11B, the sphere 39 enters the recess 40b, and the check valve 3
By releasing the pressing action on 8, the valve body 38a of the check valve 38 abuts the valve seat member 42 due to the pressure oil acting from the lift cylinder 5 and the closing biasing spring SP, and closes the oil passage 37. As the pressing force of the lift cylinder 5 due to the pressure oil increases, the valve main body 38 strongly abuts the valve seat member 42, and the check valve 38 disables the oil discharge from the lift cylinder 5.

When the switching lever 41 is operated to the open position OP or the closed position CL, the positioning sphere 43 shown in FIG. 11 enters the positioning recessed portion of the cam shaft 40 corresponding to the operated position to operate the cam shaft 40 and the operation. The lever 41 is positioned at each operation position. A connecting screw 44 configured to be mounted on one end side of the valve case 37, a connecting screw configured to be mounted across the other end side of the valve case 37, and a support body 45 included in the cylinder tube 5b of the lift cylinder 5. The drop-prevention valve 36 is attached to the cylinder tube 5b by 46. The connecting screw 44
Is the supply / discharge port 5a of the lift cylinder 5 and the oil passage 37.
It is configured to be screwed into the supply / discharge port 5a in a state of communicating with c, and also serves as a member forming the cylinder port 37a.

As a result, the fall prevention valve 36 is controlled by the control valve 34.
By connecting to the lift cylinder 5 so as to enable the oil supply / drainage operation of the lift cylinder 5 by operating the switch cylinder 34 and operating the switching lever 34 to the closed position CL, the operation can be switched to the fall prevention state 36a shown in FIG. By operating the lever 34 to the open position OP, as shown in FIG.
It is possible to switch to the operation state 36b shown in FIG. When the fall prevention state 36a is switched to, the check cylinder 38 is operated so as to prevent the lift cylinder 5 from draining oil to the control valve 34 by an external force such as the weight of the seedling planting device 10, and the seedling planting operation is performed. The attachment device 10 is the link mechanism 6 or
Prevent gravity from causing oil leakage and dropping. On the other hand, when the operation state 36b is switched to, the action of the check valve 38 is made to enable the lift cylinder 5 to drain the oil to the control valve 34 by an external force such as the weight of the seedling planting device 10. The lift cylinder 5 is released so that the lift cylinder 5 can be operated by switching the control valve 34.

As shown in FIGS. 10 and 11, the switching lever 41 is connected to the clutch lever 33 by an operation cable 47 capable of pushing and pulling, and the clutch lever 33 is operated to the entry side to operate the clutch device 25.
When the switch is turned on and off, the switching lever 41 is switched to the open position OP by the operating force, and the clutch lever 33 is operated to the disengagement side to operate the clutch device 25.
When the switch is switched to the cut side, the switch lever 41 is switched to the closed position CL by the operating force. That is, when the clutch device 25 is switched to the connected state to enable the work by the seedling planting device 10, the fall prevention valve 36 is switched to the operating state 36b, and the seedling planting is performed. Clutch device 25 for enabling folding of the attachment device 10
The clutch device 25 and the fall prevention valve 36 are linked so that the fall prevention valve 36 switches to the fall prevention state 36a when the operation is switched to the separation state.

That is, in performing the planting work, the seedling planting device 10 is brought into the connected posture in the working state, and the clutch lever 25 is switched to the entry side by the clutch lever 33 to operate the split seedling planting device portions 10a and 10b. Input shaft 23
Is connected to the power take-out section 24, so that the seedling planting device 10 can be driven. At this time, the fall prevention valve 36 is in the operating state 3 because of the linkage by the operating cable 47.
6b, lift cylinder 5 by control valve 34
The raising / lowering operation of the seedling planting apparatus 10 can be performed by the expansion / contraction operation of. Then, when the leveling float 19 is lowered to the work level where it contacts the mud surface of the field by the descending operation of the link mechanism 6 by the lift cylinder 5 and the traveling machine body is caused to travel, the seedling planting device 10 causes the leveling float 19 to mud the surface. The soil is planted, and the seedling planting mechanism 16 carries out seedling planting on this grounded site, so that a plurality of rows of seedling planting work can be performed. Then, when the rice transplanter is moved or mounted on a transport vehicle, the seedling planting device 10 is lifted to the storage level by the lifting operation of the link mechanism 6 by the lift cylinder 5. After that, the clutch lever 25 is switched to the disengagement side by the clutch lever 33 to separate the input shafts 23 of the divided seedling planting device portions 10a and 10b from the power take-out portion 24, and then the seedling planting device 10 is stored. Fold to the operation. Then, the fall prevention valve 36 is switched to the fall prevention state 36a due to the connection by the operation cable 47, and the lift cylinder 5 is prevented from being shortened while preventing oil leakage from the control valve 34 and shortening the lift cylinder 5. The width of 10 can be made narrower than during work, and the seedling planting device 10 falls from the storage level and troubles such as the guard member 48 on the lateral side of the seedling stand 18 or the seedling stand guide rail 17 hitting the rear wheel 2 occur. It is possible to easily drive and run while preventing, and to load so that it does not easily stick out from the carrier bed.

As shown in FIG. 13, the cylinder connecting member 49 for connecting to the top link 6b of the link mechanism 6 is slidably fitted onto the small diameter portion of the front end side of the cylinder rod 5c of the lift cylinder 5 so that the cylinder rod A movable spring receiving member 50 slidably fitted on the tip side small diameter portion of 5c;
A coil spring 51 is interposed between the cylinder connecting member 49 and the movable spring receiving member 50 and a spring receiving portion formed by an end surface of a large diameter portion of the base end side of the cylinder rod 5c. A disc spring 52 having a large constant is interposed. Both the coil spring 51 and the disc spring 52 are suspension springs that reduce vibrations such as traveling vibrations transmitted between the traveling machine body and the seedling planting device 10. That is, when the work traveling is performed, the seedling planting device 10 is supported by being grounded on the mud surface by the leveling float 19, and the seedling planting device 1
Since the raising / lowering control of 0 is performed, the coil spring 51 mainly acts as a cushion to enable the vehicle to travel while effectively reducing the vibration so that the raising / lowering control is less likely to be hindered with a relatively small spring constant. When the planting apparatus 10 is lifted up and travels, the disc spring 52 mainly acts as a cushion to allow the vibrations with a relatively large spring constant to travel.

[Another Embodiment] FIG. 14 shows a fall prevention valve 36.
2 shows an embodiment in which the operation is switched by another operation structure, and the fall prevention valve 36 is configured as an electromagnetic operation valve that is switched between the fall prevention state 36a and the operation state 36b by the electromagnetic operation portion 36c. Then, the fall prevention valve 36 and the clutch device 25 are linked by an electric operating circuit 53 linked to the electromagnetic operating portion 36c and a detection switch 54 provided in the electric operating circuit 53, and the clutch device 25 is switched to the entry side. When operated, the fall prevention valve 36 switches to the operating state 36b, and the clutch device 2
When 5 is switched to the cut side, the fall prevention valve 36 is changed to the fall prevention state 36a.

That is, the detection switch 54 is configured to detect the operation position of the clutch lever 33. The electric operation circuit 53 is configured to switch the fall prevention valve 36 by turning on and off the electromagnetic operation portion 36c based on the detection result of the detection switch 54. That is, the fall prevention valve 36 is switched based on whether the clutch device 25 is switched on or off based on the operation position of the clutch lever 33.

[Brief description of drawings]

[Figure 1] Side view of the entire riding rice transplanter

FIG. 2 is a plan view of the seedling planting device in a working state.

FIG. 3 is a plan view of the seedling planting device in a folded and stored state.

FIG. 4 is a side view of the seedling planting device in a folded and stored state.

[Fig. 5] Schematic diagram for changing the connection posture of the seedling planting device

[Fig. 6] Diagram of how to change the connection posture of the seedling planting device

[Fig. 7] Diagram for changing the connection posture of the seedling planting device

[Fig. 8] Diagram for changing the connection posture of the seedling planting device

FIG. 9 is a front view of the clutch device.

[Fig. 10] Hydraulic circuit diagram

FIG. 11 is a sectional view of the fall prevention valve.

FIG. 12A is a cross-sectional view showing a mounting structure of a fall prevention valve, and FIG. 12B is a cross-sectional view of a check valve internal portion of the fall prevention valve.

FIG. 13 is a cross-sectional view of the suspension spring disposition portion of the lift cylinder.

FIG. 14 is a hydraulic circuit of another embodiment.

[Explanation of symbols]

5 Lift Cylinder 6 Link Mechanism 10 Seedling Planting Devices 10a, 10b Divided Seedling Planting Device Part 23 Input Member 24 Power Extraction Unit 25 Clutch Device 36 Fall Prevention Valve 36a Fall Prevention State 36b Operation State 38 Check Valve

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A01C 11/02 A01B 73/02

Claims (2)

(57) [Claims] 1. A seedling planting device is connected to a traveling machine body by a hydraulic cylinder via a link mechanism that can be moved up and down, and the seedling planting device is configured to be split into a pair of left and right split seedling planting device portions. In addition, a working state in which both split seedling planting device parts are connected to the link mechanism in a lateral posture along the lateral direction of the traveling machine body, and a folded storage state in which the split seedling planting device portion is connected to the link mechanism in a longitudinal posture along the longitudinal direction of the traveling machine body. A seedling planting device lifting operation structure of a rice transplanter configured to be freely switchable to a fall prevention state in which a check valve acts so as to prevent the hydraulic cylinder from draining oil by the weight of the seedling planting device. , If a check valve that can be switched to an operating state in which the check valve is released from operation is connected to the hydraulic cylinder,
In addition, the connection state that can be operated by the seedling planting device, and the seedling
Switch to a detached state that allows folding and storage of the planting device
Equipped with a device that can be operated, and the device that can be switched can be switched to the connected state.
Then, the fall prevention valve switches to the operating state.
, The device that can be switched is switched to the separated state.
When operated, the fall prevention valve switches to the fall prevention state.
The switchable device and the drop
The raising and lowering operation structure of the seedling planting device of the rice transplanter, which is linked to the bottom prevention valve . 2. The seedling planting device for a rice transplanter according to claim 1, wherein the switchable device is a clutch device for separately connecting the input members of the pair of left and right split seedling planting device parts to the power take-out portion. Device lifting operation structure.