JPH0224406Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is mainly used in walk-behind rice transplanters, in which running wheels are mounted on the body of the machine, which is equipped with a float and a planting part, via a swing case, and the piston rod of the hydraulic cylinder provided in the machine body is operated by hydraulic pressure. The present invention relates to a wheel output adjustment device for a rice transplanter having a structure in which the swing case is oscillated and moved up and down relative to the machine body by expanding and contracting the swing case as appropriate by operating a switching valve.

Conventionally, the hydraulic cylinder is operated in conjunction with the OFF operation of the planting clutch lever, and the paddy wheels are protruded by a set amount in conjunction with the planting stop, and simultaneously with the OFF operation of the planting clutch when turning at the edge of a ridge. A technology has been developed to automatically project the paddy wheels, prevent mud from being pushed by the floats, and change direction. However, since the headland at the edge of the ridge is a deep field, the amount of wheel protrusion is insufficient if the paddy wheels are only protruded by a certain amount by turning off the planting clutch, and when the headland is deep, the floats touch the ground. This caused the aircraft to change direction, which had the disadvantage of encouraging the float to push mud.

The present invention solves the above-mentioned conventional drawbacks, and includes a correction sensor that detects the support height of the float when the hydraulic cylinder is controlled by turning off the planting clutch lever. When grounding is detected by the sensor, the paddy wheel is further protruded, and after the paddy wheel has been protruded a certain amount in conjunction with the off operation of the clutch lever, the correction sensor detects the grounding of the float. Even in fields where the soil is deep, the float can be lifted above the planting surface, and when planting is stopped at the edge of the ridge, the amount of wheel extension can be adjusted appropriately regardless of changes in the depth of the field.
It is an object of the present invention to provide a wheel extension adjustment device for a rice transplanter that reliably prevents the float from being pushed with mud and enables easy turning work.

Embodiments of the present invention will be described in detail below based on the drawings. FIG. 1 is a schematic side view of the whole, in which 1 is an engine, 2 is a transmission case, 3 is a planting transmission case, and 4 is a rice field supported on both sides of the transmission case 2 via swing cases 5. wheels; 6 is a float that supports the aircraft body consisting of the engine 1 and the cases 2 and 3 via a planting depth adjustment link 7 and a buffer member 8; 9 is a steering handle connected to the rear end of the transmission case 3; , 10 is a guide member 11,
12 is a seedling stand installed along the case 3 and the upper part of the handle 9 and reciprocated from side to side with a low front and back height; 13 is a seedling stand 10 that is attached to the transmission case 3 via a crank arm 14; This is a planting claw that takes out one seedling and plants it.

As shown in FIGS. 2 and 3, a hydraulic case 15 is mounted on the upper surface of the transmission case 2, and the drive pulley 16 of the case 15 is always interlocked and connected to the output pulley 17 of the engine 1 via a V-belt 18. At the same time, a hydraulic cylinder 20 for projecting the piston rod 19 to the rear of the aircraft body is assembled into the hydraulic case 15, and the tip of the piston rod 19 supports the middle of a swing plate 22 via a swing fulcrum shaft 21, and a neutral holding spring is attached to the plate 22. 23 is energized. Further, both ends of the swing plate 22 are connected via swing rods 25, 25 to swing arms 24, 24 which are integrally connected to the base ends of the left and right swing cases 5, 5, and the piston rod 19
A lock plate 26 is fixed to the tip of the piston rod 19, which controls the swinging of the swing plate 22 about the swing fulcrum shaft 21. A lock pin 27 for engaging and disengaging the paddy wheels 4, 22 is attached to the lock plate 26, and the plates 22, 26 are engaged and fixed through the pin 27 when driving on the road.
4 at approximately the same height, while supporting the lock pins 2 from the swing plate 22 during rice planting work.
7 and move the swing plate 22 to the fulcrum shaft 21.
The machine body is supported so as to be able to swing freely around the center, and the supporting heights of the left and right rice paddy wheels 4, 4 are varied depending on the unevenness of the tiller in the field, so that the machine body is supported substantially horizontally.

Further, a hydraulic switching shaft 28a and a hydraulic switching arm 29 of a hydraulic switching valve 28 for driving and controlling the hydraulic cylinder 20 are attached to the hydraulic case 15, and a swing arm 31 is attached to one side of the cylinder 20 via a support shaft 30. The hydraulic switching arm 29 is connected to one end of the swinging arm 31 via a coupling spring 33 and rods 33a and 33b. The upper end of the automatic lifting rod 34 is connected to the control plate 32 through the elongated hole 32a, and the lower end of the rod 34 is connected to the bearing sleeve 3.
A bracket 37 that connects the rod 34 and the bearing sleeve 35 together by a shock absorbing spring 36 and integrally connects the bearing sleeve 35 is fixed to the float 6, and the float 6 is connected to the buffer member 8.
When the paddy wheel 4 moves up and down due to expansion and contraction, the hydraulic switching arm 29 is displaced via the control plate 32, the spring 33, and the rods 33a, 33b, and 34, and the hydraulic cylinder 20 is driven to move the piston rod 19 forward and backward. The ground pressure of the float 6 is kept approximately constant by adjusting the opening and closing of the float.

Further, a float pressing spring 38 having a smaller spring force than the coupling spring 33 is connected to the control plate 32, and is controlled by the pressing spring 38 in a direction that follows the lowering of the lifting rod 34. While rotating the plate 32, one end of the wire 41 is connected to the control plate 32 through the elongated hole 39 and the connecting plate 40, and is attached to the steering handle 9 to operate the seedling stand 10 and the planting claw 13. The other end of the wire 41 is connected to the planting clutch lever 42 to be controlled, and when planting is stopped by turning off the clutch lever 42, the wire 41 is pulled to close the control plate 3.
2 is rotated against a pressure spring 38, the paddy wheel 4 is projected by the hydraulic cylinder 20, and the body including the float 6 is raised.

Further, a movable member 45 is connected to the swing arm 31 through an elongated hole 43 and a connecting rod 44, and a spring receiving plate 47 is installed to connect the movable member 45 to the piston rod 19 via a locking device 46. It is removably connected to the mounting body 48. Further, the locking device 46 has a locking member 50 that is fitted into a locking groove 49 formed on the lower side of the movable member 45 and is attached to the spring receiving plate 47 via a supporting frame 51. is connected to the clutch lever 42 via a spring 52 and a wire 53, and when the wire 53 is loosened by the clutch lever 42 at the same time as planting is stopped, the lock member 50 is engaged with the lock groove 49 of the movable member 45. The movable member 45 is connected to the piston rod 19.

On the other hand, the connecting rod 44 and the movable member 45 are connected by fitting an engaging piece 44a protruding from one end of the connecting rod 44 into a long engaging groove 45a formed in the movable member 45, and connecting the connecting rod 44 to the movable member 45.
A rotary adjustment body 54 is attached between the adjustment body 54 and the engagement piece 44a,
A compression spring 55 having a smaller spring force than the pressure spring 38 is interposed. When the clutch lever 42 is turned off, the connecting rod 44 moves forward by the length of the long groove 45a against the compression spring 55.
The swinging arm 31 and control plate 32 are rotated against the pressure spring 38 by tensioning the wire 41, the hydraulic cylinder 20 is operated via the switching valve 28, the piston rod 19 is advanced, and the paddy wheel 4 is projected. On the other hand, when the rod 19 advances, the swing arm 31 and the control plate 32 are rotated back through the movable member 45, so that the paddy wheel 4 is held protruding by a predetermined amount of the long groove 45a.

Next, the middle of the sensor arm 57 is pivotally supported by the chassis 56 below the engine 1, and the hydraulic cylinder 20 is turned off by turning off the planting clutch lever 42.
A correction sensor 58 for detecting the support height of the float 6 during control is provided at one end of the sensor arm 57,
The sensor 58 is attached to the upper surface of the front end of the float 6, and the hydraulic switching link 59 is attached to the hydraulic switching shaft 2 so as to be able to swing together with the hydraulic switching arm 29.
8a, and the free end of the sensor arm 57 and its switching link 59 are connected by a connecting rod 60, and when the wheel 4 is protruded by turning off the clutch lever 42, the float 6 is grounded by the sensor 58. Accordingly, the paddy wheel 4 is configured to further protrude at the time of detection.

The present invention is constructed as described above.
The rice planting work is carried out continuously as the machine moves by loading seedlings on the machine and driving the seedling platform 10 and planting claws 13. 6 rises or falls, the spring force of the pressing spring 38 is set to be smaller than that of the coupling spring 33, so as the lifting rod 34 rises and falls, the lifting control plate 32 rotates forward and backward, causing rocking. The arm 31 and the switching arm 29 are moved in conjunction, the hydraulic cylinder 20 is operated, and the paddy wheel 4 is moved.
is moved in and out to keep the ground pressure of the float 6 substantially constant.

When turning the machine at the edge of a ridge, when the planting clutch lever 42 is turned off to stop planting, the movable member 4 is attached to the piston rod 19 via the lock member 50 by turning off the lever 42.
At the same time, the lift control plate 32 is rotated via the wire 41 against the pressure spring 38, and the spring force of the compression spring 55 is set to be smaller than that of the pressure spring 38. The connecting rod 44 is extended by the length of the long groove 45a against the compression spring 55, and the swing arm 31 and the switching arm 29 are moved in the same manner as above.
is displaced, and the hydraulic cylinder 20 is actuated to cause the paddy wheel 4 to protrude. And piston rod 19
By advancing, the arms 29, 31 are rotated back via the movable member 45, the wheels 4 are protruded by a certain amount, and the hydraulic switching valve 28 is maintained neutrally.

When the paddy wheel 4 is made to protrude by turning off the clutch lever 42 as described above, for example, in a field where only the headland at the edge of the ridge is deep, the amount of the paddy wheel 4 protruding is insufficient and the float 6 remains in contact with the ground. As such,
When the float 6 touches the ground, the correction sensor 58 moves upward, displacing the hydraulic switching link 59 via the sensor arm 57 and the connecting rod 60, and operating the hydraulic cylinder 20 to further protrude the paddy wheel 4. The float 6 is lifted above the planting surface, and the aircraft can turn while preventing the float 6 from pushing mud.

As is clear from the above embodiments, the present invention includes a planting clutch lever 42 that controls the operation of the seedling stand 10 and the planting claws 13, and a hydraulic cylinder 20 that adjusts the amount of the paddy wheel 4 coming out through the swing case 5. In the structure, the hydraulic cylinder 20 is operated in conjunction with the off operation of the clutch lever 42, and the paddy wheel 4 is protruded by a set amount in conjunction with the stopping of planting. A correction sensor 58 is provided to detect the support height of the float 6 when the hydraulic cylinder 20 is controlled by the operation, and when the sensor 58 detects the grounding of the float 6 when the clutch lever 42 is turned off, the paddy wheel 4 is further protruded. By causing the correction sensor 58 to detect the grounding of the float 6 after the paddy wheel 4 has been protruded to a certain extent in conjunction with the off operation of the clutch lever 42, the float 6 can be placed on the planting surface even in fields where only the headland is deep. It can be lifted upwards, and at the same time as planting is stopped at the edge of the ridge, the amount of wheel extension can be adjusted appropriately regardless of changes in the depth of the field, ensuring that the float 6 pushes mud. It has remarkable effects such as being able to easily perform turning operations while protecting the user from damage, and can be handled more easily and safely than in the past.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall side view, FIG. 2 is an enlarged side view of the main part, and FIG. 3 is a plan view of the same. 4...Paddy wheel, 5...Swing case, 6...
... Float, 10 ... Seedling stand, 13 ... Planting claw,
20... Hydraulic cylinder, 42... Planting clutch lever, 58... Correction sensor.

Claims (1)

[Scope of utility model registration request] A planting clutch lever that controls the operation of a seedling stand and planting claws, and a hydraulic cylinder that adjusts the amount of paddy wheel protrusion through a swing case, and the hydraulic cylinder is activated in conjunction with an off operation of the clutch lever. In the structure in which the paddy wheel is activated by a set amount in conjunction with the planting stop, a correction sensor is provided to detect the support height of the float when the hydraulic cylinder is controlled by turning off the planting clutch lever. A wheel protrusion adjustment device for a rice transplanter, characterized in that the paddy wheel is configured to further protrude when the sensor detects the grounding of the float when the float is turned off.