JPS6131623Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is designed to control the control valve for the drive cylinder that moves the planting device up and down relative to this machine, and to control the planting depth to the plowing depth detection device based on the detection result by this detection device. The present invention relates to a device for lifting and lowering a planting device in a rice transplanter that is linked to automatically operate in order to maintain a constant or almost constant height. In the case of a rice transplanter, for example, when the machine is turning, the planting device is raised above the ground to avoid mud pushing by the float provided in the planting device, and when this is raised, the seedling planting operation of the planting device is activated. It is common practice to stop the plant in order to prevent the loss of seedlings due to so-called aerial planting, and for this purpose it is desirable to disengage the planting clutch and switch the planting device into a non-operating state when it is raised. Conventionally, the on/off operating lever for the planting clutch is provided separately from the planting device lifting/lowering operating lever, and the configuration is such that the above-mentioned request can be met by operating both levers. At times, two levers have to be operated separately, which puts a lot of effort on the operator's part, making it easy for the operator to forget to disengage the planting clutch when raising and lowering the planting device, ensuring that seedlings are not lost due to aerial planting. There were drawbacks that could not be avoided. In addition, in order to prevent forgetting to disengage the planting clutch as described above, it is possible to link the planting clutch and the planting device to a single lever so that they can be operated simultaneously. In this case, the planting clutch is immediately engaged as the planting device lift control lever is moved downward, so the seedling planting work can be started before the planting device reaches the mud surface, and the above-mentioned method will also work. The disadvantage of inviting aerial planting is unavoidable. The purpose of the present invention is to perform the above-mentioned lifting and lowering operation of the planting device, which is performed simultaneously with the turning and steering operation of the aircraft, when the aircraft reaches the edge of the field during rice planting work.
And in order to easily perform the on/off operation of the planting clutch by linking it to a single operating lever so that you will not forget to disengage the planting clutch,
It is an object of the present invention to provide a planting device lifting/lowering operating device in a rice transplanter which is configured to easily avoid the loss of seedlings due to the above-mentioned aerial planting and also to facilitate lever operation. The characteristic configuration of the present invention to achieve the above object is that the control valve for the drive cylinder that moves the planting device up and down with respect to this machine is connected to the plowing depth detection device to detect the detection results by this detection device. A planting device lifting/lowering operating device in a rice transplanter is linked to automatically operate to maintain a fixed or almost constant planting depth based on the control valve and the planting clutch, and a single operating lever is linked to the control valve and the planting clutch. In the linear operating path that guides this operating lever, there is a forced lift operation area at one end of the operating path during both forward and backward operations, in which the planting clutch is disengaged and the planting device is operated in the upward direction. and an automatic control operation area that places a planting clutch in an engaged state at the other end of the operation path and automatically operates the planting device to raise and lower it based on the detection result by the tiller depth detection device;
A third operation area is provided between the forced rise operation area and the automatic control operation area, in which the planting device is operated downward while maintaining the disengaged state of the planting clutch that is in the disengaged state in the forced rise operation area. This configuration provides the following effects. That is, the control valve and planting clutch for raising and lowering the planting device must be linked to a single operating lever, and the various operations associated with the above-mentioned aircraft turning must be performed in conjunction with each other.
Reliably performs the easy-to-forget operation of cutting the planting clutch.
In addition, although it can be easily performed, a third operation area is included in the operating path of the operating lever to operate the planting device downward while maintaining the disengaged state of the planting clutch that was in the disengaged state in the forced upward operation range. This makes it possible to avoid the planting clutch from entering and operating simultaneously with the lowering operation of the planting device when the operating lever is operated in either the forward or backward direction. It is possible to avoid the occurrence of aerial planting due to activation, and it is easy to avoid the occurrence of seedling loss. Moreover, as described above, although the raising/lowering operation of the planting device and the opening/closing operation of the planting clutch can be operated in the desired order of operation suitable for avoiding the occurrence of aerial planting of seedlings, the operation lever is Since the operation path is formed in a straight line, the lever operation itself can be easily performed with a simple reciprocating swing operation, and the footprint of the lever including the swing operation range is small. There are advantages. EMBODIMENT OF THE INVENTION Below, the Example of this invention is demonstrated based on description of drawing. Fig. 1 is a side view showing the entire rice transplanter, and shows a planting posture in which a planting device 2 is lowered to the ground via a parallel quadruple link mechanism 3 at the rear of a movable main machine 1 constituted by a tractor or the like. It is connected to the non-planting position raised above the ground so that it can be switched up and down. The planting device 2 includes a transmission case 4, a seedling stand 5,
It has planting nails 6 and the like and a mud surface sliding grounding float 7 for floating and supporting them on the mud surface.
Driving force is transmitted to the transmission case 4 via a transmission shaft 9 extending rearward from the transmission case 8 of this machine 1 , and while reciprocating the seedling stand 5 from side to side, the planting claws 6 are moved up and down. The structure is such that the seedlings on the seedling stand 5 are successively cut out and planted on the mud surface by being driven in circulation so as to draw an elliptical locus. Reference numeral 10 denotes a hydraulic cylinder for swinging up and down the link mechanism 3, and is pivotally mounted at the rear of the machine 1 . A control valve 11 of a forward flow/reverse flow switching type for this hydraulic cylinder 10 is connected to an operating lever 13 for raising and lowering the planting device provided near the driver's seat 12 attached to this machine 1 , the link mechanism 3, and the float 7.
As shown in FIG. 2, they are linked via link mechanisms A, B, and C, respectively. The linkage mechanism A between the lever 13 and the valve 11 includes an arm 15 fixed to the middle of the rotation shaft 14 by the lever 13, a rod 16 connected to the arm 15, and a bell crank 17 connected to the other end of the rod 16. , a rod 18 connected to the bell crank 17, and an actuating member 20, one end of which is engaged with the rod 18 via a spring 19, and actuates the valve 11.
Consists of etc. The link mechanism B between the valve 11 and the link mechanism 3 is
A rod 21 is connected to the other end of the actuating member 20, a bell crank 22 is connected to the other end of the rod 21, and a vertical link 3 of the link mechanism 3 is connected to the bell crank 22.
The vertical link 3a is connected to the link mechanism 3 by the extension of the cylinder 10.
It is configured such that it is raised along with the upward movement of the member 24 that receives the extension action only when the member 24 is raised above a certain height. The linkage mechanism C between the valve 11 and the float 7 is constructed as a plowing depth detection device, and this detection device C consists of a rod 25 connected to the middle of the actuating member 20, and a bell connected to the rod 25. Crank 26, arm 27 integrated with bell crank 26, arm 27
Release wire 28 extending from wire 28
The other end is connected to a bell crank 29, a rod 30 that pushes up and swings the bell crank 29 when the float 7 rises relative to the main body of the planting device 2 , and a spring that biases the bell crank 29 into the wire 28 tension state. It consists of 31 mag. The bell crank 26 in this detection device C is connected to a spring force adjustment lever 33 via a spring 32 that tensions and biases the wire 28. The lever 13 is pivotally attached to the rotating shaft 14 with a pin perpendicular to the axial direction of the lever 13 so as to be able to swing laterally. A linking mechanism D is interposed between the planting clutch 34 which is interposed in the transmission system that transmits power to the transmission case 4 through the transmission system. That is, one end of a rod 37 is bendably pivoted to the other end of a U-shaped member 36 whose one end is linked to a fan-shaped plate 35 fixed to the pivot shaft of the lever 13, and the other end of the rod 37 is connected to the clutch. 34 actuation arms 38
The coupling mechanism D
The following linkage check device E is provided between the linkage mechanism D and the attachment device 2 . That is, an arc-shaped elongated hole 35a is formed in the fan-shaped plate 35, and the U-shaped member 36 is loosely fitted into this elongated hole 35a, and the lever 13
A locking fitting 40 is fixed to the rod 37 for fixing the rod 37, which is pulled up accordingly, in the raised state when the rod is operated to the raising operation position. The stopper 41 is fixed to the machine frame fixed part, and the bell crank is rotated when the float 7 of the planting device 2 rises relative to the transmission case 4 due to ground pressure reaching a certain level or more due to grounding on a mud surface. A pin 42 for pushing out and releasing the rod 37 from the locked and fixed state is attached to the other end of the arm 27 linked to the arm 29 via the wire 28, thereby forming the linked check mechanism E. The operating lever 13, as shown in FIG.
The guide plate 43 is operated to reciprocate and swing along a linear operation path formed by a guide groove 44 that is partially bent in the middle but generally straight. , A highest operating position Up is provided at one end of the guide groove 44 as a forced upward operating range for operating the planting device 2 upward with the planting clutch 34 in the disengaged state, and at the other end, The clutch 34 is in the engaged state, and the planting device 2 is connected to the tiller depth detecting device C.
ON of the clutch engagement position as an automatic control operation range for lifting and lowering operations based on the detection results of
Further, at an intermediate portion between the highest operating position Up and the clutch engaged position ON, the planting device 2 is operated while maintaining the disconnected state of the planting clutch 34, which is in the disconnected state at the highest operating position Up. A lowering operation position Dn and a clutch release position OFF are provided as a third operation range for lowering the clutch. After lowering the planting device 2 to the planting position by moving the lever 13 to the lowering operation position Dn, the clutch disengagement position OFF, and the clutch engagement position ON, the float 7 is moved in response to changes in the depth of the tiller. Depending on the mud surface sinking or rising, the valve 11 is switched to the forward flow or reverse flow state via the linkage mechanism C,
Planting device 2 by expanding or contracting cylinder 10
is raised or lowered so that the float 7 rises or falls by an amount commensurate with the sinking amount or floating amount,
At this time, the valve 11 is returned to neutral, thereby automatically maintaining the proper planting posture at all times. Of course, in this case the clutch 34 is engaged and the planting device 2 is operating. Also, spring 19
is in a free state, so valve 11 and lever 13
The connection with has been severed. This state corresponds to control in the above-mentioned automatic control operation range in which the planting device 2 is raised and lowered based on changes in the vertical position of the float 7 while the planting clutch 34 is in the engaged state. When the lever 13 is moved between the position where the lowering operation position Dn is shifted to the uppermost operation position Up side and the uppermost operation position Up, the valve 11 is switched to the normal flow state via the linkage mechanism A, and the cylinder 1
0 is extended, and the link mechanism 3 is swung upward to raise the entire planting device 2 and shift it to a non-planting posture. Further, when the planting device 2 rises to a predetermined position, the valve 11 is automatically returned to the neutral position via the linkage mechanism B, and the rising of the planting device 2 is stopped. In addition, during this raising operation, the planting device 2 is raised by the extension of the cylinder 10 as described above, and the clutch 34 is directly pressed against the spring via the fan-shaped plate 35, the U-shaped member 36, the rod 37, and the arm 38. Cut and operate the planting device.
2 via the shaft 9 is cut off at the same time as the lever 13 is operated. At this time, the rod 37 is pulled up and its locking fitting 40 is locked and fixed to the stopper 41. In this state, the planting clutch 34
This corresponds to the control in the above-mentioned forced raising operation range in which the planting device 2 is forcibly raised by turning it off. Then, when the machine body rotation at the edge of the field is completed, the raised planting device 2 is lowered, and the planting clutch 34 is engaged to start the seedling planting work. to the lowering operation position Dn or the clutch disengagement position OFF. At this lowering operation position Dn or clutch disengagement position OFF, the valve 11 is switched to the reverse flow side, the cylinder 10 is contracted, and the planting device 2 is lowered, but as shown in FIG. Since the U-shaped member 36 is kept engaged with the end of the float 35a, the rod 37 and the stopper remain connected to each other both when the float 7 is away from the mud surface and when it is in contact with the mud surface. 41 is maintained, and the clutch 34 is kept in the disengaged state. In other words, the clutch 34 is operated by the operating lever 13.
The operating state is substantially the same as the automatic control state, except for the use of a check against the entry of the seedling, and this is the control in the third operating range in which the planting device 2 is operated downward while the planting clutch 34 is maintained in the disengaged state. Equivalent to. When the operating lever 13, which has been located at the lower operating position Dn or the clutch disengaged position OFF, is further swung to the left in the figure from the state shown in FIG. 2 and operated to the clutch engaged position ON, the long hole in the fan plate 35 35a also moves counterclockwise around the axis of the rotation shaft 14, the float 7 touches the mud surface, rotates the bell crank 29 clockwise, and the wire 2
8 to swing the arm 27 counterclockwise, and the pin 42 protruding from the side of the arm 27
By pushing the rod 37, the lock with the stopper 41 is released and the clutch 34 is switched to the engaged state, thereby entering the automatic control state. Once the rod 37 is disengaged from the stopper 41, the connection with the float 7 is completely cut off, so the clutch 34 remains in the disengaged state unless the lever 13 is moved to the clutch disengaged position OFF side. cannot be done. As mentioned above, move the lever 13 to the clutch engaged position.
By turning ON, the control valve 11 automatically operates to maintain the planting depth at a constant or almost constant level, and a working state is created in which the planting clutch 34 is in the engaged position, and By operating the lever 13 from the highest operating position Up to the lowered position Dn, the planting device 2 is maintained in the raised position above the ground, and the planting clutch 34 is
The non-working state that exists in the middle of the day is revealed. In other words, the operation of the valve 11 and the clutch 34 can be rationally performed by a series of operations of the single lever 13. Note that the reason why a partial bend is formed in the middle of the guide groove 44 of the lever 13 is to improve the operating feeling, but the present invention is not limited to this, and the guide groove 44 of the lever 13 is formed with a partially bent part in the middle. It may also be used as a guide groove.

[Brief explanation of drawings]

The drawings show an embodiment of the device for lifting and lowering the planting device in the rice transplanter according to the present invention, and FIG. 1 is a schematic side view of the entire rice transplanter, FIG. 2 is an exploded perspective view of the main parts, and FIG. 3 is an enlarged view of the part. FIG. 1 ... This machine, 2 ... Planting device, 10... Cylinder, 11... Valve, 13... Operation lever, 3
4...planting clutch, 44...operation route, C...
...Plowing depth detection device, Up...Forced rise operation area,
ON...Automatic control operation area, Dn/OFF...Third operation area.

Claims (1)

[Scope of utility model registration request] The control valve 11 for the drive cylinder 10 that raises and lowers the planting device 2 relative to the main machine 1 is controlled by the tiller depth detection device C to maintain the planting depth at a constant or constant level based on the detection result by the detection device C. A planting device lifting/lowering operation device in a rice transplanter that is linked to automatically operate to maintain a substantially constant state, and the control valve 11 and the planting clutch 3
A planting clutch 34 is connected to one operating lever 13 in the linear operating path 44 that guides the operating lever 13 at one end of the operating path 44 during both forward and backward operations. A forced rise operation area Up in which the planting device 2 is operated to the rise side as a cutting state, and the other end side of the operation path 44,
an automatic control operation range ON in which the planting clutch 34 is placed in the engaged state and the planting device 2 is automatically operated up and down based on the detection result by the tiller depth detection device C; the forced raising operation range Up; The planting clutch 34 is in a disconnected state in the forced rise operation range Up between the automatic control operation range ON and the automatic control operation range ON.
A planting device lifting/lowering operating device for a rice transplanter, which is provided with a third operating range (Dn/OFF) for lowering the planting device 2 while maintaining the cut state.