JPH0524259Y2 - - Google Patents

Description

[Detailed explanation of the invention] "Industrial application field" This invention supports the planting part at the rear of the traveling vehicle via a link mechanism so that it can be raised and lowered, and one seedling is loaded from the seedling stand during the planting operation. Regarding a rice transplanter that takes out rice using a planting claw and plants the rice one after another, the planting part is raised and lowered based on changes in the ground pressure of a float supported below the planting part to maintain a constant planting depth. This invention relates to a planting control device.

"Prior Art" Normally, when hunting occurs in planting depth control, no particular means is provided to suppress the hunting.

``Problem that the invention seeks to solve'' For this reason, when hunting occurs during control, methods such as operating the sensitivity adjustment lever or interrupting control have been used each time, but these methods are extremely inefficient. Ta.

``Means for Solving the Problems'' Therefore, the present invention provides a hunting sensor for detecting hunting occurring in the planting area under automatic control conditions, and also provides a sensitivity adjustment element for automatic planting depth control. The hunting sensor is connected in an interlocking manner, and the sensitivity of the automatic planting depth control is automatically adjusted based on the detection by the hunting sensor.

"Operation" According to the present invention, if hunting occurs in the planting area during normal automatic control of planting depth, the control is automatically adjusted to low sensitivity to suppress the occurrence of hunting. This can stabilize control and improve planting depth performance.

"Embodiments" Examples of the present invention will be described below in detail based on the drawings. Fig. 1 is a side view of the planting section, Fig. 2 is a side view of the riding rice transplanter, and Fig. 3 is a plan view of the same. Attach the rear end of the body frame 3 to the transmission case 4.
A front wheel 6 for driving in paddy fields is supported on both sides of the front part of the transmission case 4 via an axle case 5, and a transmission case 7 is connected to both sides of the rear part of the transmission case 4. A rear wheel 8 for running in paddy fields is supported at the rear end of the case 7. A spare seedling stand 10 is attached to both sides of the bonnet 9 that covers the engine 2, etc., and the transmission case 7 is attached to the vehicle body cover 12 forming the step 11.
etc., and a driver's seat 13 is placed on the top of the vehicle body cover 12.
A steering handle 14 is provided at the rear of the bonnet 9 in front of the driver's seat 13.

In addition, reference numeral 15 in the figure is a planting section that is equipped with a seedling stand 16 for multi-row planting, a plurality of planting claws 17, etc. The planting claws are supported by the planting case 20 via the rails 18 and guide rails 19 so as to be slidable left and right, and the planting claws are attached to the planting case 20 via the planting arm 21 and the planting claw drive shaft 22 which are moved by a crank. Install 17. And the planting case 2
Center and left and right floats 2 for leveling planting below 0
3, 24, 24 are supported by the planting case 20 via the planting depth adjustment link 25, and a link hitch 27 is provided on the front side of the planting case 20 via the rolling fulcrum shaft 26, and the top link 28 and the lower This planting section 15 is connected to the rear side of the traveling vehicle 1 via a three-point link mechanism 30 including a link 29 and a link hitch 27, and a hydraulic cylinder 31 for raising and lowering the planting section 15 is connected to the transmission case 4.
It is interposed between the rear part and the top link 28, and while the planting part 15 is raised and lowered by the expansion and contraction movement of the pressure oil cylinder 31, the planting part 15 is lowered and each float 23, 24 is landed, and the left and right One seedling is taken out one by one by a planting claw 17 from a seedling table 16 that is reciprocated and planted.

Further, in the figure, numeral 32 is a travel speed change lever, 33 is a planting lift lever, 34 is an interplant speed change lever, 35 is a clutch pedal, and 36, 36 are left and right brake pedals.

A pitching fulcrum shaft 37 that supports the front part of the central float 23 in a vertically swingable manner is provided on a bracket 38 on the rear upper surface of the float 23, and a planting depth adjustment fulcrum shaft 39 is rotatably supported in the planting case 20. Then, the base end of the planting depth adjustment link 40 is fixed to the adjustment fulcrum shaft 39, and the tip of the adjustment link 40 is connected to the pitching fulcrum shaft 37.

Further, the middle of the output link 42 is rotatably supported on the support shaft 41 of the planting case 20, and the detection arm 4 is connected to the rear end of the output link 42 via a connecting link 43.
The four tips of the detection arm 44 are connected, and the base end of the detection arm 44 is fixed to the fulcrum shaft 39, and the planting depth adjustment wire 45 is connected to the tip of the output link 42. Further, an outer receiving arm 4 detects a change in the support angle of the float 23 due to vertical swinging of the front end side of the central float 23 about the pitching fulcrum shaft 37.
6, the outer receiving arm 46 is provided on the front upper surface of the float 23 via a bracket 47 and a pin 48, and a long hole 49 is provided in the outer receiving arm 46.
The tip of the output link 42 is connected via a pin 50, and one end of an outer wire 51 into which the adjustment wire 45 is inserted is connected to the outer receiving arm 4.
Fix it at 6.

Furthermore, a hydraulic switching valve 52 for supplying hydraulic pressure to the hydraulic cylinder 31 as appropriate is provided, and a lowering spring 54 is provided for protruding a spool 53 of the valve 52, and at one end of a switching cam 55 whose intermediate portion contacts the spool 53. The planting depth adjusting wire 45 is connected, the other end of the cam 55 is pivotally supported on a fixed support shaft 55a on the machine body side, and a lowering operation spring 56 for separating the switching cam 55 from the spool 53 is attached to the cam 55. While connected to the other end, a base end of a sensitivity adjustment lever 58 is pivotally supported inside the vehicle body cover 12 in which the switching valve 52 and the like are installed via a fixed support shaft 57 on the body side, and a connector is connected to the base end of the lever 58. 59 and an adjustment motor 62 which is a sensitivity adjustment element attached to a fixed frame 61 through a rotating screw shaft 60 are interlocked and connected, and when the lever 58 is oscillated by forward and reverse driving of the motor 62, the hydraulic switching valve 52 is The front part of the float 23 is raised and lowered with respect to the neutral position to adjust the sensitivity to the planting field surface, and when the float 23 moves up and down due to changes in the ground pressure on the float 23, a hydraulic switching valve is activated via the wire 45 and the switching cam 55. 52 is operated to raise and lower the planting section 15, so that the planting depth of the seedlings by the planting claws 17 is kept substantially constant.

On the other hand, a potentiometer-type hunting sensor 63 for detecting vertical hunting of the planting section 15 is installed on the driver's cab frame 64 at the rear end of the transmission case 7, and the actuator 63a of the sensor 63
is in constant contact with the operating rod 65 extending from the front end of the top link 28, vertical hunting occurs in the planting section 15, and the top link 28 swings its rear end up and down about the fulcrum shaft 66 connected to the frame 64. When this occurs, the sensor 59 is configured to detect this.

FIG. 4 shows the hydraulic circuit of the hydraulic cylinder 31, in which the hydraulic cylinder 31 is connected to a hydraulic pump 67 operated by the driving force of the engine 2 via the hydraulic switching valve 52, and the spool 53 of the switching valve 52 is connected to the hydraulic pump 67 which is operated by the driving force of the engine 2. Even if the switching operation is performed by
1 is configured to expand and contract.

FIG. 5 shows a control circuit for the sensitivity adjustment motor 62, which connects the hunting sensor 63 and the sensor 63.
A sensitivity control circuit 69 is provided, which includes a hunting setter 68 for setting a reference output of the control circuit 69.
the adjustment motor 62 via a forward/reverse drive circuit 70.
are connected. The hunting setting device 68 is provided to determine hunting when the hunting amplitude signal which is the output value of the sensor 63 as shown in FIG. 6 exceeds the upper limit setting level V1 a set number of times or more within a set time (T). When the sensor 63 detects such hunting, the motor 62 is driven forward or backward, and the lever 58 is moved in the direction of the arrow a in FIG. When the number of times that V2 exceeds the lower limit level V2 within a set time (T) is less than a set number of times, the motor 62 is driven in reverse or forward direction and the lever 58 is moved in the direction of the arrow b in the figure to increase its sensitivity. It is configured so that

This embodiment is configured as described above, and when the sensor 63 detects vertical hunting of the planting part 15 during work, that is, the detected value of the sensor 63 exceeds the upper limit setting level V1 within the set time (T). When the number of times exceeds the set number, the motor 62 is driven to move the adjustment lever 58 in the direction of the arrow in FIG. Attached part 1
5, when the detection value of the sensor 63 exceeds the lower limit setting level V2 within the set time (T) is less than or equal to the set number of times, the motor 62 is driven to move the adjustment lever 58. The float 23 is moved in the direction of the arrow b in the figure to make the detection of changes in ground pressure by the float 23 more sensitive.

The neutral zone of sensitivity in the above-mentioned embodiments can be adjusted by either the level V1 or V2 value or the time (T) width. In addition, in the above-mentioned embodiment, a configuration example was shown in which the vertical hunting of the planting section 15 is restricted when controlling the planting depth, but the same applies when regulating hunting during rolling during the rolling control of the planting section 15. It is something.

"Effects of the Invention" As is clear from the above embodiments, the present invention automatically raises and lowers the planting section 15 based on changes in the ground pressure of the float 23 supported below the planting section 15, and adjusts the planting depth. In a structure that maintains a constant state, a hunting sensor 63 is provided to detect hunting occurring in the planting section 15 under automatic control, and
The hunting sensor 63 is interlocked and connected to the sensitivity adjustment element 62 for automatic planting depth control, and the sensitivity adjustment for automatic planting depth control is automatically performed based on the detection by the hunting sensor 63.
Even when planting depth control is performed under normal or high-sensitivity conditions, when the occurrence of hunting is large, the sensitivity is automatically adjusted to low sensitivity, and appropriate control that suppresses the occurrence of hunting. This enables good planting work that maintains a stable planting depth. Conventionally, it was not possible to easily determine hunting behavior in the planting area by visual inspection by the operator, so hunting can be eliminated manually. However, it was not easy to deal with uneven working conditions in the field, but it is possible to eliminate these conventional problems and perform automatic planting depth control stably and appropriately. Recruitment is also easy.

[Brief explanation of drawings]

Figure 1 is an explanatory side view of the planting section, Figure 2 is an overall side view, Figure 3 is a plan view of the same, Figure 4 is a hydraulic circuit diagram,
FIG. 5 is an electric circuit diagram, and FIG. 6 is a sensor output diagram. 15...Planting section, 23...Float, 62...
Sensitivity adjustment element, 63...hunting sensor.

Claims (1)

[Scope of utility model registration request] In a structure in which the planting part 15 is automatically raised and lowered based on changes in the ground pressure of a float 23 supported below the planting part 15 to maintain a constant planting depth, the planting part 15 under automatic control is A hunting sensor 63 is provided to detect hunting that occurs, and the hunting sensor 63 is interlocked and connected to a sensitivity adjustment element 62 for automatic planting depth control, and the automatic planting depth control is controlled based on the detection by the hunting sensor 63. A planting control device for a rice transplanter, characterized in that it is configured to automatically adjust sensitivity.