JPH034B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear-planting type riding-type rice transplanter in which a seedling planting device is attached to the rear of a traveling machine on which a worker rides.

In this rear-planting type riding-type rice transplanter, the seedling planting device, which has a float that slides on the field, is located at the rear of the traveling vehicle, so when the seedling planting device's float is grounded on the field, it cannot be used in normal rice transplanting operation. , Wheel marks caused by the wheels on the traveling vehicle body can be leveled and erased by a float located behind them. However, when the rice-transplanting operation progresses to the edge of the harbour, where it turns 180 degrees, each float that touches the field pushes the mud sideways and external force acts on the floats in the lateral direction, causing damage to the floats. In order to avoid this problem, the seedling planting device is raised so that its float moves away from the field, making it impossible to eliminate wheel marks when turning.

The present invention eliminates the wheel trail when turning in direction by raising the seedling planting device so that its float is slightly lifted from the field surface when turning in direction near the edge of the field. However, when the seedling planting device is raised to a point where its float floats a little above the field, it is important to consider the relationship between the height of the seedling planting device and the traveling machine to correspond to the height of the seedling planting device with respect to the traveling machine. changes depending on the depth between the tiller where the wheels of the traveling machine touch the ground and the field surface where the float touches the ground, that is, the depth of the tiller, so it is important to keep the floating height of the float relative to the field always the same. Can not do it.

Therefore, the present invention provides a float with a sensor float that can freely move up and down independently of the float, and by grounding the sensor float on the field, the float and sensor are connected when raising the seedling planting device. Depending on the change in relative height, when the relative height reaches a predetermined value, the raising of the seedling planting device is stopped, and the height of the float rising from the field surface is adjusted regardless of the plowing depth. is made to be constant.

The present invention will be explained below with reference to drawings of embodiments. In the drawings, 1 indicates a running vehicle body.
is the part 2 before being attached to the vehicle body frame 2 and its front lower surface.
Consists of a wheel 3 and two rear wheels 4 attached to the rear lower surface,
The upper surface of the vehicle body frame 2 is provided with a control seat 5 and a steering handle 6 for moving and steering the two front wheels 3, and an engine 7 mounted on the front upper surface of the vehicle body frame 2 is used to control each of the wheels 3, It runs by driving 4.

Reference numeral 8 indicates a parallel link mechanism 9 at the rear of the traveling vehicle body 1.
and a seedling planting device that is vertically movable and detachably attached via a hitch mechanism 10, and the seedling planting device includes:
A transmission case 12 to which power is transmitted from the traveling vehicle body 1 via a telescopic shaft 11, and planting cases 13, 13, 13 attached to both left and right sides of the transmission case 12 at appropriate intervals in the lateral direction via pipe-shaped support members. , consists of floats 14, 15, 14 which are pivoted to the lower surface of each planting case so that the front part can freely move up and down, and a seedling stand 16 whose upper end is inclined so as to approach the traveling vehicle body 1. A seedling planting mechanism 17 is provided at the rear end of the case, and a solenoid hydraulic switching valve 18 is provided between the traveling vehicle body 1 and the parallel link mechanism 9.
Hydraulic cylinder 2 that raises and lowers seedling planting device 8 with respect to a field scene 19 by switching hydraulic pressure according to
0 is provided, and the hydraulic pressure switching valve 18 is in a neutral position where the springs 22a and 22b on both sides cut off the flow of hydraulic pressure into and out of the hydraulic cylinder 20 when neither the left nor the right solenoids 21a and 21b are energized. When the solenoid 21b on the left side is energized, the solenoid 21b on the right side is switched to a raised position where hydraulic pressure is sent to the hydraulic cylinder 20, and when the solenoid 21a on the right side is energized, the solenoid 21a is switched to a lowered position where the pressure inside the hydraulic cylinder 20 is released.

Further, a transmission case 12 in the seedling planting device 8
A planting clutch mechanism (not shown) for turning on and off the drive of the seedling planting device 8 is provided inside, and the planting clutch mechanism is operated by a clutch lever 23 provided on the right side of the seat 5. The 23 clutch levers are equipped with a clutch-in switch 24 that turns on when the clutch is turned on, and a clutch release switch 25 that turns on when the clutch is turned off. Both switches 24 and 25 are powered by a power battery. 26.

27 is the center float 15 among the above floats.
The sensor float 27 is connected to the central float 15 by a parallel link mechanism 28 consisting of a pair of upper and lower links of equal length in a direction perpendicular to the traveling direction.
The sensor float 27 is pressed downward by a spring 29 against the center float 15 so that it is still in contact with the field surface 19 even if the center float 15 rises away from the field surface 19. energized.

A pair of upper and lower fixed contacts 31a and 31b are provided on the bracket 30 erected on the front upper surface of the central float 15 at appropriate intervals in the vertical direction, and the upper contact 31a is used for lowering the hydraulic switching valve 18. The lower contact 31 is connected to the right solenoid 21a.
b are respectively connected to the left lifting solenoid 21b, while the bracket 32 hanging down from the transmission case 12 in the seedling planting device 8 has both fixed contacts 31
A movable contact 33 inserted between a and 31b is provided, and the movable contact 33 is connected to the clutched switch 24. In addition, the sensor float 2
The bracket 34 at 7 is also provided with a pair of upper and lower fixed contacts 35, 36 at appropriate intervals in the vertical direction, and the upper contact 35 is connected to the lowering right solenoid 21.
a, the left solenoid 2 for raising and lowering the lower contact 36
1b, and a cantilever type movable contact 38 made of a leaf spring is provided on a bracket 37 erected from the central float 15, and the movable contact 38 is connected to the clutch release switch 25.
8 between both fixed contacts 35 and 36,
The lower surface of the center float 15 and the sensor float 27
When the movable contact 38 is at the same height as the bottom surface of
The distal end thereof is configured to be brought into contact with the lower contact point 36 in a state in which it is bent upward by an appropriate height H against its elasticity.

In this configuration, the seedling planting device 8 is lowered so that each of its floats 14 and 15 touch the field 19, the traveling vehicle body 1 is moved forward, and the clutch lever 23 is rotated to the ON position. By driving the seedling planting device 8, the rice planting work can be performed, and since the clutch engagement switch 24 is turned on by turning on the clutch lever 23, the seedlings can be planted in the field scene 19 during the rice planting work. When the height of the device changes to become lower, the front part of the central float 15 is displaced upward and the lower fixed contact 31b comes into contact with the movable contact 33, causing the switching valve 1
By energizing the left raising solenoid 21b of 8, the switching valve 18 is switched to the raising position, and the seedling planting device 8 is raised to the point where the movable contact 33 is separated from the lower fixed contact 31b, and the seedling planting device 8 is moved to the field area 19. When the height of the device increases, the front part of the center float 15 is displaced downward and the upper fixed contact 31b comes into contact with the movable contact 33, and the lowering right solenoid 21a is energized, causing switching. The valve 18 is switched to the lower position, and the seedling planting device 8 is lowered to the point where the movable contact 33 is separated from the upper fixed contact 31a, whereby the height of the seedling planting device with respect to the field surface is lowered to the point where the upper fixed contact 31a is separated from the movable contact 33. ,31b
It can be automatically controlled within the height range.

Then, as the rice-planting work described above progressed to the edge of the bank,
To turn the clutch lever 23 in the 180° direction near the shore, the clutch lever 23 is rotated to the OFF position to stop the drive of the seedling planting device 8 and interrupt the rice planting operation. By turning the clutch switch 24 to
While the clutch release switch 25 is turned OFF and the above-mentioned automatic height control state is canceled, the clutch release switch 25 is turned ON. At this time, the lower surface of the central float 15 and the lower surface of the sensor float 27 are approximately at the same height.
Since the movable contact 38 made of a leaf spring is in contact with the lower fixed contact 36 in a flexibly deformed state, when the clutch lever 23 is turned to the OFF position and the clutch release switch 25 is turned ON, the hydraulic pressure is released. The left lifting solenoid 21b in the switching valve 18 is energized, the switching valve 18 is switched to the lifting position, and the seedling planting device 8 is lifted away from the field area 19, whereby the rear part of the central float 15 is also lifted. However, the sensor float 27, which is movable up and down with respect to the center float 15, still remains in the field 1.
9, only the center float 15 rises, and when this rising height reaches the deflection deformation set value H of the leaf spring movable contact 38, the movable contact 38 separates from the lower fixed contact 36. Then, the excitation of the left raising solenoid 21b is released and the switching valve 19 is placed in the neutral position, so that the seedling planting device 8 can be raised only when each float 14, 15, 14 is moved from its original grounding depth position with respect to the field surface 19. It will stop in a floating state so that it is separated by the appropriate height H.

Therefore, by moving the front two wheels 3 of the traveling vehicle body 1 using the steering handle 6 and turning in this state, each float 14, 15, 14 can travel across the field without pushing the mud sideways. Wheel marks caused by the wheels 3 and 4 on the vehicle body 1 can be leveled and erased, and in this case, the upper fixed contact 3 provided on the bracket 34 of the sensor float 27
5 is for lowering the seedling planting device 8 when the seedling planting device 8 rises too much.

In summary, the present invention provides a rear-planting riding type rice transplanter in which a seedling planting device having a float that is grounded on the field, a seedling stand, and a seedling planting mechanism is attached to the rear of a traveling vehicle body so that the seedlings can be raised and lowered. When the seedling planting device is raised so that its float is slightly above the field surface when the seedling planting device is turned, the rising height is determined relative to the sensor float that is movable up and down with respect to the float in the seedling planting device and the float. Since it is regulated according to the height, the height at which the float of the seedling planting device is slightly raised above the field can be kept approximately constant regardless of the depth of the plow in the field, and the direction of the rice transplanter can be changed. The float has the effect of reliably erasing wheel marks during turning without causing mud pushing by the float.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a riding rice transplanter, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is a side view of a riding rice transplanter.
FIG. 2 is an enlarged cross-sectional view of FIG. 2, and FIG. 4 is a schematic diagram of the apparatus. DESCRIPTION OF SYMBOLS 1... Traveling vehicle body, 8... Seedling planting device, 20... Hydraulic cylinder, 9... Parallel link mechanism, 12... Transmission case, 14, 15,... Float, 16...
Seedling stand, 17...Seedling planting mechanism, 27...Sensor float.

Claims (1)

[Claims] 1. In a rear-planting type riding-type rice transplanter, which is equipped with a seedling planting device having a float that is grounded in the field, a seedling stand, and a seedling planting mechanism attached to the rear of a traveling vehicle body so that the seedlings can be raised and lowered, the float in the seedling planting device In this method, a sensor float that is grounded independently of the float is movable up and down in the field, and when the seedling planting device is raised, the seedling planting device is raised according to the relative height of the sensor float with respect to the float. A riding-type rice transplanter characterized by being designed to stop moving.