JPH022172Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of an automatic rolling posture adjustment device in a seedling planting device of a riding type rice transplanter.

Generally, in the seedling planting device of a riding rice transplanter, a plurality of seedling planting mechanisms are often installed in parallel at appropriate intervals on both sides of the traveling direction of the traveling machine so as to plant seedlings along multiple rows in the field. In this case, the seedling planting depth with respect to the field scene at the left and right positions of the seedling planting device is made constant, and the planting depth is configured to be changeable at the same time in both left and right positions.

By the way, the field is a generally horizontal surface with water on the tiller, but the tiller itself is uneven, and the depth from the field varies depending on the location. Because it runs while touching the ground, it is not always perpendicular to the field, and may tilt to the left or right in the direction of travel.

In such a case, when the seedling planting device tilts left and right in the same way as the traveling machine tilts left and right, the vertical height interval from the field surface will differ at the left and right positions of the seedling planting device due to the tilt, and the seedlings at the left and right positions will An inconvenience arises when the planting depths are different, with one being too deep and the other being too shallow.

Therefore, in the present invention, the seedling planting device is connected to the traveling machine so that it can roll left and right, and an automatic rolling attitude adjustment device for the seedling planting device is provided near the connection point, and an automatic rolling attitude adjustment device for the seedling planting device is installed at both the left and right end positions of the device and the seedling planting device. This system attempts to automatically control the rolling posture by linking a height position detection sensor with respect to the field scene, and even though the seedling planting depth is adjusted in the seedling planting device, the accuracy of both the left and right detection sensors is low. The purpose is to keep it constant.

Below, we will explain an example in which the present invention is applied to a so-called rear-planting riding type rice transplanter in which a seedling transplanting device is attached to the rear of the traveling machine.
indicates a running vehicle body, and the running vehicle body 1 includes a vehicle body frame 2, two front wheels 3, 3 attached to the front lower surface thereof, and two rear wheels 5, 5 attached to the rear lower surface via chain cases 4, 4. The vehicle body frame 2 has a control seat 6 and a steering handle 7 on the upper surface thereof, and is driven forward by an engine 8 located on the front upper surface of the vehicle body frame 2.

Reference numeral 9 denotes a seedling planting device located at the rear of the traveling vehicle body 1, and the seedling planting device 9 is connected to a transmission case 10, and a case 1 attached to the transmission case 10 at appropriate intervals in the lateral direction.
1, 11, 11, floats 12, 13, 12 attached to the bottom of each planting case and the upper end is the traveling vehicle body 1
It consists of a seedling stand 14 that is inclined so as to approach the
A vertically swinging seedling planting mechanism 1 is installed at the rear end of each planting case.
5 is provided.

A left and right longitudinal tubular connecting rod 40, which is rotatably supported around an axis on the lower surface of each of the planting cases 11, 11, 11, has each end attached to each float 12, 1.
The base ends of arm rods 42, 42, 42 which are pivotally connected to the flanges 41 on the upper surfaces of 3 and 12 are fixed, while the lower end is fixed to an appropriate midway point of the connecting rod 40. The transmission case 10
When the adjusting lever 43 is tilted forward and downward in the position direction, the height H ₁ from each planting case 11 to the field area 45 becomes lower, and each seedling planting mechanism 15 The depth of planting seedlings in the field area 45 becomes deeper, and conversely, when the adjustment lever 43 is rotated upward in the position direction, the height _H1 increases and the depth of seedling planting becomes shallower. The attachment mechanism 15 is configured so that the seedling planting depth can be changed all at once.

The base ends of a pair of left and right lower links 16, 16 of equal length are rotatably attached to the rear lower surface of the traveling vehicle body 1, and the base end of one top link 17 is rotatably attached to the rear upper surface. , 16 and the joint plates 18, 18 disposed on the left and right sides of the tip of the top link 17 are connected by a pair of upper and lower pin shafts 19, 20, and the tip of the top link 17 is connected to the upper pin shaft 19. , the ends of both lower links 16, 16 are rotatably attached to the lower pin shaft 20, and a pair of upper and lower hitch pins 2 are provided between both joint bodies 18, 18.
1 and 22, a bracket plate 23 with a rolling shaft 24 provided at a position on the plane center line of the traveling vehicle body 1 is attached to the side surface of the transmission case 10 of the seedling planting device 9 on the traveling vehicle body 1 side. A hit body 25 formed in a U-shape in plan is rotatably fitted onto the rolling shaft 24 of the bracket plate 23 so that it can be inserted between the two joint bodies 18, 18, and the left and right side plates of the hit body 25 are The front surfaces of the hit body 25 are provided with downward hook portions 27, 27 on the upper part to be hooked to the upper hit pin 21, and recesses 28, 28 on the lower part into which the lower hit pin 22 can be fitted, while the left and right side plates of the hit body 25 are provided. A hit shaft 29 is rotatably supported between 26 and 26 in parallel with both hit pins 21 and 22, and a lever handle 30 is fixed to one end of the hit shaft 29. The hit shaft 29 between the both side plates 26, 26 is configured to rotate.
are provided with eccentric cams 31, 31, and hook levers 32, 32 which are hooked on the lower hitch pin 22 are rotatably fitted onto the eccentric cams 31, 31. 32 are connected via a pipe 33 so that they can be rotated at the same time,
When the lever handle 30 is rotated toward the seedling planting device 9, a pin 34 protruding outward from one end of one of the lever handles 32 and a pin 35 protruding outward from the lever handle 30 are provided. A spring 36 is mounted to bias both foot levers 32, 32 in a direction in which they hook onto the lower hit pin 22.

A lifting hydraulic cylinder 37 for raising and lowering the seedling planting device 9 is provided between the traveling vehicle body 1 and the top link 17, and a stopper rod 38 having a U-shape in plan is provided at the tip of both lower links 16, 16. fixed,
When the seedling planting device 9 is raised to the highest position, the stopper rod 38 comes into contact with a contact portion 39 fixed to the bracket plate 23 to prevent it from rising any further.

Reference numeral 46 denotes a rolling attitude automatic adjustment device for the seedling planting device 9, which is composed of a double-rod double-acting hydraulic cylinder 47 and both left and right sensors 48a and 48b, which will be described later. A rod 50 protruding from both left and right ends of the hydraulic cylinder 47 is supported by a pair of protruding left and right receiving plates 49, 49, and compression springs 51, 51 are provided between nuts at both ends of the rod 50 and each receiving plate 49, 49. is inserted, and the pin 52 protruding forward from the bracket plate 23 of the seedling planting device 9 is fitted into the guide support member 53 having a U-shaped cross section and protruding backward from the cylinder outer peripheral surface of the hydraulic cylinder 47 so as to be vertically slidable. . When the hydraulic cylinder 47 moves to the left of the left-right center line 54 in the traveling direction of the traveling machine, the seedling planting device 9 is tilted about the rolling shaft 24 so that its left end faces downward, and vice versa. When the hydraulic cylinder 47 moves to the right of the center line 54, the seedling planting device 9 is configured to tilt so that its right end faces downward.

Further, a switching valve 55 that sends hydraulic pressure to the hydraulic cylinder 47 is fixed to a bracket 56 fixed to the outer periphery of the tubular connecting rod 40 for adjusting the seedling planting depth, and a pair of left and right rolling postures are used to operate the switching valve 55. For example, the base end of the sensor 48a on the left side in the traveling direction of the traveling machine is connected to the tubular connecting rod 40.
The tip of the left sensor 48a extends in the direction of the field, and the left sensor 48a has an arm 57 at its base end that extends in the opposite direction to the sensor tip.
a is connected to a rotating spool 59 of the switching valve 55 via a link 58a.

The base end of the right sensor 48b is connected to the tubular connecting rod 4.
It is fixed to the protruding right end of a rod-shaped operating rod 60 that is rotatably inserted into the inner diameter of the sensor 48b. An arm 57b whose left end protrudes appropriately from the left end of the tubular connecting rod 40, and an arm 57b fixed to the left end of the operating rod 60 is connected to the rotary spool 59 of the switching valve 55 via a link 58b, as shown in FIG. If the seedling planting device 9 is tilted about the rolling shaft 24 so that the right side faces downward in the direction of movement, the tip of the sensor 48b on the right side will be placed in the field scene 4.
The arm 57b and the link 58b are rotated upward by the arm 57b and the link 58b.
The rotary spool 59 of the switching valve 55 is rotated through the pump 62, and hydraulic pressure is sent from the A port to the left chamber of the hydraulic cylinder 47 via the P port.
The oil in the right chamber returns to the tank 63 via the B port and the R port, and the hydraulic cylinder 47 is aligned with the center line 51.
Since the pin 52 is pushed to the left by the guide support member 53 attached to the guide supporting member 53, the entire seedling planting device 9 is tilted and lowered by an appropriate angle θ ₁ so that its right side faces upward. 9 becomes approximately parallel to the field surface so that the vertical distance between the lower surfaces of the planting cases 11, 11 and the field surface 45 at both left and right ends thereof is approximately equal, the switching valve 55 becomes the neutral position and maintains its posture. Hold. On the other hand, if the left side of the seedling planting device 9 is tilted downward, the tip of the sensor 48a on the left side will be pushed by the field surface and rotated upward, causing the arm 57a to rotate upward.
The rotating spool 59 of the switching valve 55 is rotated via the link 58a, and oil enters the right chamber of the hydraulic cylinder 47 from the B port via the P port, and the oil in the left chamber flows from the A port to the R port. Returning to Kunku 63, the hydraulic cylinder 47 is moved to the right of the center line 51, and in the same way as described above, the seedling planting device 9 is tilted by an appropriate angle θ ₂ around the rolling shaft 24 so that its left side faces upward. The attitude is controlled so that it is approximately parallel to the plane.

In this configuration, when the seedling planting depth adjustment lever 43 is rotated downward as shown by the two-dot chain line in FIG. three floats 12,1
3 and 12 move upward at the same time against the lower surface of each planting case 11, 11, 11, and the vertical distance from the field scene 45 is increased.
H ₁ becomes smaller and the seedling planting depth can be increased all at once.
At this time, the bracket 56 of the tubular connecting rod 40
The switching valve 55 attached to the connecting rod also rotates together with the connecting rod,
Furthermore, both the left and right sensors 48a and 48b are connected to the connecting rod 40.
Since it can rotate around the same axis as the rotation axis of
Arms 57a, 5 of both sensors relative to the switching valve 55
7b, links 58a, 58b, etc., remain substantially constant regardless of the adjustment of the seedling planting depth, and there is no need to adjust the neutral position of the switching valve 55 each time in accordance with the seedling planting depth adjustment.

In addition, in the present invention, the rolling shaft 2
4 may be directly rotated by a rotary actuator, and instead of the hydraulic switching valve 55, a switching means using an appropriate electric signal such as a rotary switch or a rotary step motor may be adopted. Furthermore, the seedling planting device can be connected to enable rolling by other means rather than the rolling shaft, and can also be applied when the seedling planting device is provided at the front of a traveling machine.

In summary, the present invention connects a multi-row seedling planting device to a traveling machine so that it can roll freely, and controls the posture of the seedling planting device near the connection point so that its horizontal height is approximately parallel to the field surface. A rolling posture automatic adjustment device is provided, and the seedling planting device is equipped with left and right long connecting rods rotatable around its axis to simultaneously adjust the seedling planting depth at the left and right seedling planting locations. The connecting rod is provided with a switching means for operating the automatic adjustment device, and sensors that contact the field surface are rotatably provided on both operating sides of the connecting rod, and both sensors are connected to the switching means. , which are connected to operate the switching means, and the connecting rod for adjusting the seedling planting depth is long arranged across the left and right sides of the seedling planting device. The accuracy of detecting the rolling posture of the implantation device is improved. In addition, since a switching means is provided on the connecting rod that rotates when adjusting the seedling planting depth all at once, and both sensors are provided on this connecting rod so that they can rotate freely concentrically, the switching means can be switched regardless of the seedling planting depth adjustment work. The relative positional relationship between the valve and both sensors can be made almost the same,
There is no need to adjust the rolling posture adjustment device, and the accuracy can be maintained constant.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the rice transplanter, FIG. 2 is a plan view, FIG. Figure 5 is a cross-sectional view taken along the - line in Figure 3, Figure 6 is a cross-sectional view taken on the - line in Figure 4, and Figure 7 shows the seedling planting depth adjustment device and the switching valve. A plan view showing the relationship with the sensor, Fig. 8 is the − of Fig. 7.
The line sectional view and FIG. 9 are hydraulic circuit diagrams. 1... Traveling machine, 9... Seedling planting device, 11,1
1,11...planting case, 12,13,12...
Float, 10... Transmission case, 24... Rolling shaft, 40... Connection rod, 60... Operating rod, 48
a, 48b...sensor, 47...hydraulic cylinder,
52... Pin, 53... Guide support member, 43...
...Seedling planting depth adjustment lever, 55...Switching valve, 59...
...Rotating spool, 57a, 57b...Arm, 5
8a, 58b...link.

Claims (1)

[Scope of utility model registration request] A seedling planting device for multi-row planting is connected to the traveling machine so that it can roll freely, and an automatic rolling attitude adjustment device is installed near the connection point to control the attitude of the seedling planting device so that its horizontal height is approximately parallel to the field surface. The seedling planting device is provided with a left and right long connecting rod rotatable around its axis in order to simultaneously adjust the seedling planting depth at the left and right seedling planting locations, and the connecting rod is is provided with a switching means for activating the automatic adjustment device, and rotatably provided on both the left and right sides of the connecting rod, sensors that contact the field surface, and using both sensors as the switching means, the switching means is actuated. An automatic rolling posture adjustment device in a seedling planting device of a riding type rice transplanter, which is connected so as to move the seedlings.