JPS6217482B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seedling bed feeding device using hydraulic pressure in a rice transplanter.

Conventionally, this hydraulic feeding device for seedling stands synchronized the timing of the horizontal feed of the seedling stand using a plunger pump with the movement of the planter, but the timing for switching left and right of the vertical and horizontal feeding of the seedling stand was synchronized. I wasn't there. By the way, the left and right moving ends of the seedling stand are scraped once by the planter after horizontal movement, and then the pine seedlings are vertically fed by rollers, etc., and in this state are scraped one more time by the planter, but conventionally This timing is difficult to perform accurately, and the first and last horizontal feeds at the vertical and horizontal movement ends become inaccurate, making it difficult to accurately scrape and plant at the left and right horizontal movement ends of the seedling stand. Ta.

Therefore, the present invention communicates the cross-feed cylinder device with the vertical feed cylinder device via the vertical feed switching valve, and is configured to operate after the vertical feed cylinder device is moved to the moving end of the cross-feed cylinder device. Further, due to the operation of the vertical feed cylinder device, the horizontal feed switching valve is configured to be switched after the vertical feed, thereby preventing the timing of the horizontal feed and the vertical feed of the seedling stand from being different, and the above-mentioned It is an object of the present invention to provide a seedling stand feeding device for a rice transplanter that eliminates the drawbacks.

Hereinafter, the present invention will be specifically explained based on an embodiment shown in the drawings.

As shown in FIG. 1, the rice transplanter 1 has paddy wheels 2.
It has a frame 5 on which a float 3 is swingably supported, an engine 6 is mounted on the front part of the frame 5, and a planter 7 is arranged on the rear part. Further, a handle 8 is provided at the rear of the frame 5, and a seedling stand 11 is provided on the handle 8 so as to be slidable by a slide piece 10. Further, as shown in FIG. 2, a cross-feeding cylinder device 12 is fixed to the handle 8 and arranged on the back side of the seedling stand 11, and rods 13 protrude from both ends of the cylinder device 12.
is connected to the seedling stand 11. Further, a vertical feed cylinder device 15 and a vertical feed switching valve 16 are fixed to the handle 8, and the operating lever 16a protruding from the switching valve 16 is connected to a stopper 17 provided on the back side of the seedling stand 11.
17. Further, a seedling receiver 18 is fixed to the lower part of the handle 8, and the seedling receiver 18 is in sliding contact with the lower end of the seedling stand 11. Furthermore, frame 5
A plunger pump 20, a cross-feed switching valve 21, and an oil tank 22 are arranged at the rear upper part, and as shown in FIG.
is connected to. The cross feed switching valve 21 is connected to each cylinder chamber 12a of the cross feed cylinder device 12,
12b, and is branched to the vertical feed cylinder device 1 via the vertical feed switching valve 16.
It also connects to 5. On the other hand, a transmission case 23 is fixed to the rear end of the frame 5, as shown in FIG. 25 is rotatably supported. The drive shaft 25 protrudes from the case 23 and drives the planter 7, and transmits power to the pump drive shaft 27 via a chain 26. A three-stage eccentric cam 28 and a slide cam 30 are slidably supported on the pump drive shaft 27 by a spline 27a, and the eccentric cam 28 is in sliding contact with the plunger 20a of the plunger pump 20.
The slide cam 30 can also be brought into contact with the switching lever 31. The eccentric cam 28 is connected to the shift fork shaft 33 via a fork 32, and the plunger 20a can be connected to the plunger 20a by sliding and adjusting a grip 33a of the fork shaft 33 protruding from the case 23 in the direction of the arrow. Sliding contact 3
The amount of eccentricity x of the stepped eccentric cam 28 can be adjusted. Therefore, the discharge amount of the plunger pump 20 can be adjusted, and the horizontal feed pitch amount of the seedling stand 11 can be adjusted. On the other hand, the slide cam 30 is in contact with one end 34a of a bell crank-shaped lever 34, and the switching lever 34 is normally operated by a spring 35.
1, but by rotation of the lever 34, it is slid to a position where it can come into contact with the switching lever 31. The switching lever 31 is connected to a lever 37 outside the case 23 via a shaft 36, and the lever 37 is connected to an operating lever 40 supported by the operating shaft 21a of the lateral feed switching valve 21 via a one-way clutch 38. It can come into contact with you. As shown in detail in FIG. 5, the operating lever 40 has one end biased by a spring 41 in the direction of contacting the lever 37, and the other end contacting a stopper 42 provided on the valve 21, so that the operating lever 40 is pressed against the lever 37. Rotation position is regulated. In addition, 7a in FIG. 5 indicates the peak at the tip of the planter 7, and 43 indicates the peak 7a.
It shows the trajectory of movement drawn by the tip. On the other hand, the other end 34b of the lever 34, one end of which is in contact with the slide cam 30, is connected to a Bowden wire 45, and the other end of the wire 45 is connected to a Bowden wire 45, as shown in FIG.
Vertical feed drive lever 4 pivotally supported on handle 8
It is connected to 6. One end 46 of the drive lever 46
a is the plunger 1 of the vertical feed cylinder device 15
5a, and the cylinder device 15 is constituted by a single-acting cylinder having a spring 47 urging the plunger 15a toward the cylinder chamber 15b. Note that the spring 47 is connected to the piston 13 of the lateral feed cylinder device 12.
The strength is set so that the plunger 15a cannot operate while the plunger a can move. On the other hand, the other end 46b of the vertical feed drive lever 46 is connected to the vertical feed lever 4.
8, and the lever 4
8 is a stopper part 48 that can come into contact with the seedling stand 11
It has a. Further, as shown in detail in FIG. 7, the lever 48 is biased by a spring 50 so that the stopper portion 48a comes into contact with the seedling stand 11 and is held in a fixed position. It is interlocked with a shaft 51 via a one-way clutch 52. A predetermined number of seedling vertical feed rollers 54 are fixed to the drive shaft 51, and a portion of the rollers 54 penetrates the seedling platform 11 and protrudes from the surface, making it possible to feed the pine seedlings in the vertical direction. can. Further, a spring 53 is stretched between the operating lever 16a of the vertical feed switching valve 16 and the handle portion.
a is stably held in the switched position by the stopper 17.

Since the present invention has the above configuration, as the rice transplanter 1 moves forward based on the rotation of the paddy wheel 2, the rotation of the engine 6 is also transmitted to the planter drive shaft 25 via the transmission device such as the chain 24, The peak 7a at the tip of the planter 7 draws a motion locus 43 shown in FIG. 5 to scrape off one pine seedling on the seedling stand 11 and plant it in the field. At the same time, the pump drive shaft 27 is also rotated via the chain 26, and the plunger pump 20 is driven based on a predetermined amount of eccentricity of the three-stage eccentric cam 28. At this time, the downward stroke of the planter 7, that is, the movement trajectory a→
The timing is determined such that the plunger pump 20 discharges during the period b, and the pump 20 sucks during the upward stroke of the planter 7, that is, between the motion trajectory b→a. The oil discharged from the pump 20 is transferred to the cross feed cylinder device 12 via the cross feed switching valve 21.
The seedling stand 11 is fed laterally via the piston rod 13, but since the timing is adjusted as described above, the peak 7a of the planter 7
When the seedling stand 11 is at the a position, the seedling stand 11 starts to be moved horizontally to the b position of the peak 7a, and then the seedling stand 11 is moved between the b and a position of the peak 7a.
horizontal feed is suspended. Note that when the peak 7a scrapes the pine seedlings on the seedling tray 11, the horizontal feeding of the seedling tray 11 has started, but the feeding speed is slow because the cam eccentricity has only just begun in a small range. , the peak 7a does not become a hindrance when scraping the seedlings. In this way, planter 7
The seedling tray 11 is moved intermittently in the horizontal direction in synchronization with the timing, and when it reaches just before the moving end, for example, just before the left moving end as shown in FIG.
The operating lever 16a of the vertical feed switching valve 16 comes into contact with the stopper 17 fixed on the back side of the
The lever 16a is switched against the spring 53 so that the pressure oil side cylinder chamber 12b of the horizontal feed cylinder device 12 communicates with the vertical feed cylinder device 15. However, even when the vertical feed switching valve 16 is switched, the spring 47 of the vertical feed cylinder device 15 is set to a strength that does not operate under the horizontal feed pressure of the seedling stand 11. No oil will flow in. This results in
Furthermore, the piston 13a of the cross-feeding cylinder device 12
moves, and when the left moving end of the seedling stand 11, that is, the piston 13a, comes into contact with the left wall of the cylinder device 12, the piston 13a cannot move, so the pressure in the right cylinder chamber 12b increases, and therefore the pressure oil is the cylinder chamber 15b of the vertical feed cylinder device 15
It is sent out against the spring 47. As oil flows into the cylinder chamber 15b, the plunger 15a extends and rotates the vertical feed drive lever 46, and the lever 46 contacts the vertical feed lever 48, causing the lever 48 to move in the direction of the arrow against the spring 50. Rotate to. The rotation of the vertical feed lever 48 is transmitted to the vertical feed drive shaft 51 via a one-way clutch 52.
The vertical seedling feed roller 54 is rotated by a predetermined amount to convey the pine seedlings on the seedling stand 11 toward the apron 18. At this time, the discharge of the plunger pump 20 sent to the cylinder chamber 15b of the vertical feed cylinder device 15 corresponds to the scraping of the planter 7 at the final end of the seedling stand 11. That is, when the plunger 15a extends, the beak 7a is between the motion trajectory a→b, but when the plunger 15a begins to extend, the beak 7a scrapes the last seedling in the row, and the seedling in the row When the seedlings are completely exhausted, the vertical feed drive lever 46 contacts the vertical feed lever 48 to rotate the seedling vertical feed roller 52. At the same time,
By the rotation of the vertical feed drive lever 46, the lever 34 is rotated by an angle θ as shown by the chain line in FIG. 4 via the Bowden wire 45. Due to this rotation, the slide cam 30 moves in the direction of the arrow against the spring 35 and is moved to a position where it can come into contact with the switching lever 31. As a result, the switching levers 31 and 37 are rotated by the rotation of the slide cam 30 based on the pump drive shaft 27, and the operating lever 40 is rotated against the spring 41. Operation lever 40
The rotation in the direction of the arrow in FIG. At this time, the lever 34 is connected to the plunger 15a of the vertical feed cylinder device 15.
, that is, the motion trajectory 43 of the planter 7 is a
→The slide cam 30 rotates while in position b.
As shown by the chain line in FIG. 4, the position where the beak 7a overlaps with the switching lever 31 is at position b of the beak 7a, which corresponds to the end point of the discharge stroke of the pump 20, and therefore the slide cam 30 and the switching levers 31, 37
The operating lever 40 rotates as shown by the chain line in FIG.
It will be near position c. When the horizontal feed switching valve 21 is switched, the oil in the cylinder chamber 15b of the vertical feed cylinder device 15 is transferred to the spring 47.
The oil is pushed out and returned to the oil tank 22. As a result, the plunger 15a contracts, the vertical feed drive lever 46 also rotates, and the contact with the vertical feed lever 48 is released.
0, the stopper part 48a is placed on the seedling stand 11.
It is returned to the normal position where it touches the back surface. In addition, at this time,
The vertical feed roller drive shaft 51 is a one-way clutch 52
It does not rotate due to the action of Further, the rotation of the vertical feed drive lever 46 is also transmitted to the lever 34 via the Bowden wire 45, and the slide cam 3
0 is returned by the spring 35 to a position where it does not overlap with the switching lever 31 as shown by the solid line in FIG. At the same time, the operating lever 40 is returned to its home position against the stopper 42 by the spring 41, but the lateral feed switching valve 21 is not immediately switched due to the action of the one-way clutch 38. In addition, by switching the cross feed switching valve 21, the left cylinder chamber 12a of the cross feed cylinder device 12 is changed.
Pressure oil is sent out by the plunger pump 20, and the seedling stand 11 is moved horizontally to the right in synchronization with the planter 7 from the first stroke in the next row.

As explained above, according to the present invention, after the seedling stand 11 has been moved to the left and right horizontal movement ends, oil is supplied to the vertical feed cylinder device 15 for the first time to perform vertical feeding, and Since the horizontal feed switching valve 21 is switched and the horizontal feed in the opposite direction is started after the vertical feed, the timing of the horizontal and vertical feed of the seedling tray 11 does not coincide under any conditions, and the seedlings can be reliably fed. can carry out scraping and planting work. Furthermore, since the switching operation between vertical and horizontal feeding is performed slowly in synchronization with the movement of the planter 7, the acceleration acting on the seedling stand 11 and the feeding mechanism is small, and the operation is reliable and smooth, and the structure is simple. It is sufficient and can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a rice transplanter to which the present invention can be applied, Fig. 2 is a perspective view of the rear thereof, Fig. 3 is a hydraulic circuit diagram according to the present invention, and Fig. 4 is a front view showing a transmission part of the present invention. A sectional view, Fig. 5 is a side sectional view, and Fig. 6 is a sectional view.
The figure is a side sectional view showing the seedling stand driving section, and FIG. 7 is a front sectional view thereof. DESCRIPTION OF SYMBOLS 1...Rice transplanter, 7...Planter, 11...Seedling stand, 12...Horizontal feed cylinder device, 13a...Piston, 15...Vertical feed cylinder device, 16...Vertical feed switching valve, 20...Plunger pump, 2
1...Transverse feed switching valve, 28...Cam driving the plunger pump, 30...Cam, 47...Spring.

Claims (1)

[Claims] 1. A transverse feed cylinder device connected to a seedling stand is communicated with a plunger pump synchronized with the planter through a transverse feed switching valve, and the seedlings are placed by the discharge of the plunger pump. In a rice transplanter capable of horizontally feeding the table, the horizontally feeding cylinder device is connected to a vertically feeding cylinder device via a vertical feeding switching valve, and the vertical feeding cylinder device is connected to a moving end of the horizontal feeding cylinder device. A seedling tray feeding device configured to be activated after the seedling tray is moved, and further configured to cause the horizontal feeding switching valve to be switched after vertical feeding due to the operation of the vertical feeding cylinder device. 2. The vertical feed cylinder device is constituted by a single acting cylinder that is pressed by a spring of such strength that it cannot operate while the piston of the lateral feed cylinder device is movable, and the lateral feed switching valve is configured to be connected to the plunger. 2. The seedling rack feeding device according to claim 1, which is configured to be switched by a cam that is linked to a cam that drives a year pump and that can be operated based on the operation of the vertical feeding cylinder device.