JPH0242086Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a float constant pressure device for a riding rice transplanter that maintains the ground pressure of the float constant through a control mechanism by mechanical displacement of a sensor provided on the top link.

Conventionally, as shown in Japanese Utility Model Application Publication No. 56-12919, there has been a riding rice transplanter in which a control valve for controlling the raising and lowering of the planting section is provided in the top link to keep the float ground pressure substantially constant.

However, since the above-mentioned conventional technology uses the top link as a sensor, it is not possible to easily stop the detection operation of the top link, it is not possible to increase the leveling force by increasing the float ground pressure, and it is not possible to increase the float support. There were structural and functional problems such as the top link being easily activated by vibrations in the planting area.

However, in the present invention, the planting part, which has a leveled float on the lower surface, is supported by a lower link and a top link so as to be able to rise and fall freely, while a sensor is provided to connect the top link to a control valve, which is linked to changes in the ground pressure of the float. In a float constant pressure device for a riding rice transplanter, which operates a control valve according to the displacement of the sensor to control the elevation of the planting section and keep the float ground pressure approximately constant, an excessive ground pressure detection operation of the sensor that controls the float to rise. A lock body is provided to prevent this, and by fixing the sensor on the lock body, the automatic raising control operation of the control valve by the sensor is stopped, and rice planting work can be performed with a float ground pressure greater than that under automatic control. It is characterized by:

Therefore, since the excessive ground pressure detection operation of the sensor connected to the top link is regulated by the lock body, it is possible to simplify the lock body structure and the lock body engagement/disengagement operation more easily than before. , it is possible to prevent the sensor from detecting excessive ground pressure by operating the lock while rice transplanting is continuing.
For example, in areas with many irregularities in the field or areas with hard soil, the ground pressure of the float can be set higher than the automatic control setting value to obtain a sufficient leveling effect of the float, while automatic control can be used when a sensor is not required. The lock body can also be used as a means for releasing the rice, making it easier to carry out functional rice transplanting work suited to the field conditions than in the past, and easily improving handling operability and safety. be.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

Fig. 1 shows a riding rice transplanter according to the present invention, in which 1 is a machine body, 2 and 3 are front and rear running wheels mounted on both front and rear sides of the machine body 1, respectively, 4 is a driver's seat installed on the machine body 1, 5 is a control handle installed in front of the driver's seat 4; 6 is a planting section supported at the front of the aircraft body 1 so as to be able to rise and fall via a pair of left and right lower links 7 and one top link 8; 9 is a planting section 10 is a planting claw for taking out one seedling from the seedling platform 9; 11 is a transmission case to which the seedling platform 9 and the planting claw 10 are attached; 12; is a float that supports the transmission case 11, and is configured to sequentially take out one seedling from a seedling platform 9 that moves back and forth from side to side while the machine 1 is running, using a planting claw 10, and successively plant it in the field. are doing.

The lower link 7 is connected via a lift link 13a to a lift arm 13 that is operatively connected to a hydraulic system (not shown) provided in the machine body 1, and the swinging operation of the arm 13 also lifts the planting portion 6, that is, the float. 12 is moved up and down to adjust the planting depth of seedlings using the planting claws 10.

Further, the hydraulic arrangement is connected to one control mechanism, that is, a hydraulic switching control valve 14, and the control valve 14 is connected to an operating lever 15 provided near the operating handle 5 and a height of the planting section 6. The lever 15 is connected in conjunction with a sensor that detects the
The control valve 14 can be selectively actuated by manual or automatic operation via a sensor.

However, near the control handle 5 of the aircraft 1,
A bracket 16 having a U-shaped cross section is provided, and elongated holes 17 extending in the longitudinal direction of the fuselage 1 are formed oppositely in the upper part of each side wall of the bracket 16, and the fuselage side end of the top link 8 is formed between the side walls of the bracket 16. By interposing the pin 18 between the elongated holes 17, the top link 8 is supported in the range of the elongated holes 17 so as to be freely movable back and forth.

Also, the top link 8 is connected within the bracket 16.
Two sensors 19 are inserted through the pins 18 on both sides of the bracket 1.
The shaft rod 20 is inserted between the lower part of the side wall of the bracket 16, and the bush 21 is fitted onto the shaft rod 20 in the bracket 16 to fix each sensor 19 to the bush 21. 2
0 are connected by a spring pin 22, and the shaft rod 20 is rotated by the movement of the top link 11, that is, the swinging of each sensor 19 in accordance with the vertical movement of the planting part 6. There is.

A shaft rod 23 is installed near the operating lever 15, and a sleeve-shaped first actuating body 24 and a second actuating body 25 are fitted on both sides of the shaft rod 23 in the axial direction so as to be freely rotatable. This first operating body 24
A protruding rod 26 is provided in a protruding manner, and the protruding rod 26 is connected to a protruding rod 28 provided on the proximal boss portion 27 of the operation lever 15 via a connecting rod 29, and by swinging the lever 15, the first While the actuating body 24 is configured to rotate, the second actuating body 25 is provided with a protruding rod 30, and the protruding rod 30 and the shaft rod 2 of the bracket 16 are connected to each other.
The second actuating body 25 is configured to be connected to a protruding rod 31 protrudingly provided on the top link 0 via a connecting rod 32, and to rotate the second actuating body 25 by the rotation of the shaft rod 20 as the top link 11 moves. There is.

Further, a sleeve-shaped relay body 33 is placed between each of the actuating bodies 24 and 25 on the shaft 23.
The rotation of each of the actuating bodies 24 and 25 is transmitted to the shaft rod 23 via the relay body 33.

Furthermore, a protruding rod 34 is provided at the axial end of the shaft rod 23.
A cylindrical body 37 having two protruding rods 35 and 36 is rotatably supported via a pin 38 near the control valve 14, and one of the protruding rods 35 and the shaft rod 23 The control valve 16 is connected to the other projection rod 36 via a connecting rod 39, and the switching rod 40 of the control valve 16 is connected to the other projection rod 36.
4 and 25, the rod 40 is moved and the control valve 14 is switched and controlled.

Further, an interlocking mechanism is provided between each of the actuating bodies 24 and 25 and the relay body 33 to selectively interlock each of the actuating bodies 24 and 25 with respect to the relay body 33. A protrusion 41 is formed on the side wall portion facing the body 33, and an engaging portion 42 that protrudes into and engages with the protrusion 41 is formed on the relay body 33 side, and the protrusion 41 of the actuating body 24 is aligned with the imaginary line in FIG. As shown in FIG. 2, the engaging portion 42 of the relay body 33 is formed smaller by the swing stroke of the operating lever 15, and the first actuating member 24, that is, the operating lever 15 is not affected over this range. The relay body 33 is configured to be rotatable along with the second operating body 25.

Further, a protrusion 43 is formed on the side wall of the second actuating body 25 facing the relay body 33, and an engaging portion 44 that protrudes and engages with the protrusion 43 is formed on the side of the relay body 33. As shown in the imaginary line in FIG.
It is formed to be smaller by the movement stroke of the top link 11, and the first actuator 24 can be operated over this range without affecting the second actuator 25, that is, the operating system between the actuator 25 and the top link 11. The accompanying relay body 33 is configured to be rotatable.

In this way, when the control valve 14 is operated by the operation lever 15, the control valve 14 is operated independently of the operation system on the second operating body 25 side, and when the control valve 14 is operated by the top link 11, that is, the sensor 19,
Control valve 1 regardless of the operating system on the first actuating body 24 side.
It is configured to operate 4.

In addition, 45 in the figure is a spring stretched between the protrusion 35 of the cylinder body 37 and a part of the fuselage body.
The switching rod 40 of No. 4 is always urged upward.

Further, 46 and 47 are turnbuckles interposed between the connecting rods 29 and 39, and 48 is a frame plate to which the bracket 16, the shaft rod 23, etc. are attached.

By the way, as shown in FIGS. 7 and 8, a sensor lock device 49 is provided to properly prevent displacement of the sensor 19 and fix its position. The plate 50 is guided and supported by the frame plate 48 via a guide pin 51 and a guide groove 52, and the guide pin is attached to a lock lever 53 via a swing arm 54 whose base end is rotatably supported by the frame body 48. The lock plate 50 is moved along the guide groove 52 of the frame body 48 by swinging the lock lever 53 as shown by the solid line in the same figure.
When the float is moved downward, the locking surface 50a of the locking plate 50 comes into contact with the back of the sensor 19 to fix and hold the sensor 19 in a forward tilted position, thereby locking the float constant pressure device, that is, the float 1.
At the same time, the frame body 4 is fixed in position by swinging the lock lever 53 as shown by the imaginary line in the figure.
When the lock plate 50 is moved upward along the guide groove 52 of No. 8, the lock plate 50 is detected by the sensor 19.
The structure is such that the float constant pressure device is unlocked by separating the float and making the sensor 19 free to move.

Further, a spring 57 extending over the fulcrum is stretched between a spring mounting pin 55 fixed to the frame 48 and a fixing pin 56 of the swing arm 54, so that the lock lever 53 is held at the switching position. are doing.

The present invention is constructed as described above, and when the planting part 6 is moved upward to a predetermined height or higher while the rice transplanter is running in the automatic mode, the top link 8 is moved backward, and accordingly, the top link 8 is moved backward. Sensor 19 and shaft 2
0, the prong 31 is swung backwards, and the second
The actuating body 25 is rotated forward, and the engagement with the actuating body 25 causes the shaft rod 23 to be rotated forward via the relay body 33. Switching rod 4 of control valve 14
0 is moved downward, the control valve 14 is controlled to switch, and the pressure device is controlled to the descending side.

Further, the rod 40 is always urged upward by the spring 45, that is, the hydraulic system is always urged upward. Therefore, when the planting section 9 moves down below a predetermined height, the spring 45 It is automatically returned to a predetermined height.

However, when the rice transplanter is running in the automatic mode, the relay body 33 does not engage with the first actuating body 24, so the operating system on the first actuating body 24 side does not operate, and the operating lever 15 is something that is held in a predetermined position.

By the way, when manually raising and lowering the planting section 6, it is done by using the operating lever 15. At this time, when the operating lever 15 is swung backwards, the first actuating body 24 is rotated forward. The relay body 33 is engaged with the actuating body 24 and the shaft rod 23 is rotated forward, and each projection rod 3 of the cylindrical body 37 is accordingly rotated forward.
5 and 36, the rod 40 is moved downward, and the hydraulic system is lowered.

Further, when the operating lever 15 is operated to swing forward, the rod 40 is moved upward, contrary to the above case, and the hydraulic system is raised.

On the other hand, in the case of planting work in a field with severe unevenness or hard soil, the locking device 49 is activated to fix the planting part 6, that is, the float 12 in position on the ground. 8th
When the lock lever 53 is swung to the solid line state shown in the figure, the lock plate 50 is moved down via the swing arm 54 and the locking surface 50a of the lock plate 50 is brought into contact with the back of the sensor 19. As a result, the sensor 19 is prevented from swinging rearward, and the upward movement of the float 12 is restricted, so that even if the ground pressure of the float 12 becomes large, the float 12 maintains a fixed position relative to the aircraft body. Therefore, the leveling effect is increased, and even in fields with poor conditions, it is possible to carry out planting operations at a constant and accurate planting depth.

In addition, when the locking device 49 is operated as described above with the planting section 6 lifted while traveling on the road, the float constant pressure device also stops operating without being activated due to vibrations of the machine while traveling. and is safely protected together with the float 12.

As is clear from the above embodiments, in the present invention, the planting section 6 having the leveled float 12 on the lower surface is supported by the lower link 7 and the top link 8 so as to be able to rise and fall freely, and the top link 8 is connected to the control valve 14. A sensor 19 is provided, and the control valve 1 is controlled by the displacement of the sensor 19 in conjunction with the ground pressure change of the float 12.
In a float constant pressure device for a riding rice transplanter, which operates 4 to control the elevation of the planting section 6 and keep the ground pressure of the float 12 substantially constant, the sensor 19 that controls the elevation of the float 12 is prevented from detecting excessive ground pressure. A lock body 50 is provided, and a sensor 19 of the lock body 50 is provided.
The sensor is connected to the top link 8, and is configured so that the automatic raising control operation of the control valve 14 by the sensor 19 is stopped by a fixed operation, and rice planting can be performed with a ground pressure of the float 12 that is greater than that under automatic control. Since the excessive ground pressure detection operation of 19 is regulated by the lock body 50, the structure of the lock body 50 and the engagement/disengagement operation of the lock body 50 can be simplified more easily than in the past.
While rice transplanting is continuing, the sensor 19 can be prevented from detecting excessive ground pressure by operating the lock body 50. For example, the ground pressure of the float 12 can be set to be automatically controlled in areas with many irregularities or hard soil in the field. By making the value larger than the above value, a sufficient leveling effect of the float 12 can be obtained, while the lock body 50 can also be used as a means for canceling the automatic control when the sensor 19 is not needed. It is possible to easily carry out a functional rice transplanting operation suitable for the situation, and it is possible to easily improve handling operability and safety.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Fig. 1 is an overall side view of the riding rice transplanter, Fig. 2 is a side view of the main parts, Fig. 3 is a front view of the same, and Fig. 4 is a side view of the riding rice transplanter. The same external perspective view, Figures 5 and 6 are X-X in Figure 3.
7 is an enlarged side view of the main part, and FIG. 8 is an enlarged front view of the main part. 8... Top link, 12... Float, 14
...Control mechanism (control valve), 19...Sensor.

Claims (1)

[Scope of utility model registration request] The planting part 6, which has a leveled float 12 on its lower surface, is supported by a lower link 7 and a top link 8 so as to be able to rise and fall freely, and a sensor 19 is provided that connects the top link 8 to a control valve 14 to detect changes in the ground pressure of the float 12. In a float constant pressure device for a riding rice transplanter, the control valve 14 is actuated by the displacement of the interlocking sensor 19 to control the raising and lowering of the planting section 6, and the ground pressure of the float 12 is kept substantially constant. A lock body 50 is provided to prevent the sensor 19 from detecting excessive ground pressure, and by operating the lock body 50 to fix the sensor 19, the automatic increase control operation of the control valve 14 by the sensor 19 is stopped, and the increase in pressure is greater than that during automatic control. A float constant pressure device for a riding rice transplanter, characterized in that it is configured to perform rice planting work using the ground pressure of the float 12.