JPS6138412Y2 - - 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, the feed amount in a hydraulic feed device for a seedling stand has been changed by changing the stroke of a plunger pump and regulating the return amount of the plunger. For this reason, the cam for driving the plunger collides with the plunger every rotation, so
The cam and plunger were worn out prematurely.

Therefore, the present invention uses a multi-stage eccentric cam that is slidably supported on the pump drive shaft to drive the plunger pump, and by sliding the multi-stage eccentric cam, the feeding amount of the seedling tray is adjusted. , the pump drive shaft is connected to the planter drive shaft, and the stop position of the planter drive shaft is set so that the flat surface of the multistage eccentric cam is connected to the plunger so that sliding of the multistage eccentric cam is not obstructed when changing the discharge amount of the plunger pump. It is an object of the present invention to provide a seedling stand feeding device for a rice transplanter which eliminates the above-mentioned drawbacks by adjusting the timing so that the seedling stand comes into contact with the rice transplanter.

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. In addition, as shown in Figure 2, a seedling stand 1
A cross-feeding cylinder device 12 is fixed to a handle 8 on the back side of the seedling device 1, and rods 13 protruding from both ends of the cylinder device 12 are connected to a seedling stand 11. Further, a vertical feed switching valve 16 is fixed to the handles 8, 8, and an operating lever 16a protruding from the switching valve 16 can come into contact with stoppers 17, 17 provided on the back side of the seedling stand 11. Further, as shown in detail in FIG. 7, a reinforcing plate 18 is fixed across the two handles 8, 8.
A vertical feed cylinder device 15 is provided at the center of the handle 8 so as to extend upwardly along the handle 8. Furthermore, a plunger pump 20, a lateral feed switching valve 21, and an oil tank 22 are arranged at the rear upper part of the frame 5, and as shown in FIG. It communicates with the valve 21. The horizontal feed switching valve 21 communicates with each cylinder chamber 12a, 12b of the horizontal feed cylinder device 12, and also communicates with the vertical feed cylinder device 15 via a branched vertical feed switching valve 16. On the other hand, the rear end of the frame 5, as shown in FIG.
A transmission case 23 is fixed, and a planter drive shaft 24 is rotatably supported by the case 23. Chain 2 is connected to the drive shaft 24 from the engine 6.
A sprocket 26 to which power is transmitted via a transmission device such as No. 5 is rotatably supported, and a meshing pawl 26a is formed on one side of the sprocket 26. Further, a meshing clutch plate 27 is provided on the drive shaft 24 so as to be able to slide freely, and the clutch plate 27 is connected to the sprocket 2 by a spring 28.
It is always biased so as to mesh with the pawl 26a of No. 6, and can also be disengaged by the shift lever 29. The lever 29 is led out to the outside of the case 23 by a shaft 29a, and is further connected to a spring 3.
0 and the planter clutch via Bowden wire 31. Further, a notch 27a is formed in a part of the outer surface of the engaging clutch plate 27, as shown in FIG. A stopper 32 that can be engaged with the notch 27a is fixed in a corresponding position. Drive shaft 24
protrudes from the case 23 and drives the planter 7, and also connects to the pump drive shaft 3 via the chain 33.
It is transmitted to 4. A three-stage eccentric cam 35 and a slide cam 36 are slidably supported on the pump drive shaft 34 by a spline 34a, and the eccentric cam 35 is in sliding contact with the plunger 20a of the plunger pump 20 to drive the pump 20. , the slide cam 36 can also come into contact with the switching lever 38. The three-stage eccentric cam 35 is shown in FIGS. 8 and 9.
As shown in the figure, the eccentricity is X ₁ , X ₂ , X ₃ respectively
It consists of three eccentric circular cams, and one side thereof is aligned at a distance L from the center and has a flat surface 35a.
Therefore, the opposite surfaces thereof have stepped portions spaced apart by distances l ₁ , l ₂ , and l _{3 ,} respectively. The eccentric cam 35 is connected to a shift fork shaft 40 via a fork 39, and by sliding and adjusting a grip 40a protruding from the case 23 of the fork shaft 40 in the direction of the arrow, the eccentric cam 35 can be connected to the plunger 20a. Three-stage eccentric cam 35 in sliding contact
The amount of eccentricity X 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 36 is a bell crank-shaped lever 37
Although it is normally held in a position where it does not come into contact with the switching lever 38 by a spring 39, it is slid to a position where it can come into contact with the switching lever 38 as the lever 37 rotates. The switching lever 38 is connected to a lever 41 outside the case 23 via a shaft 40, and the lever 41 is connected to an operating lever 4 supported by the operating shaft 21a of the lateral feed switching valve 21 via a one-way clutch 42.
3. As shown in detail in FIG. 5, the operating lever 43 has one end biased by a spring 45 in the direction of abutting against the lever 41, and the other end abutting against a stopper 46 provided on the valve 21. Rotation position is regulated. In addition, 7a in FIG. 5 indicates the peak at the tip of the planter 7,
And 47 indicates a motion trajectory drawn by the tip of the peak 7a. On the other hand, the other end 37b of the lever 37, which has one end in contact with the slide cam 36, is connected to a Bowden wire 49, and the other end of the wire 49 is connected to the plunger 15a of the vertical feed cylinder device 15, as shown in FIG. It is connected to a vertical feed drive lever 50 which is fixed via a bracket 51 to the vertical feed drive lever 50 . The cylinder device 15 is composed of a single-acting cylinder having two springs 52 that urge the plunger 15a toward the cylinder chamber via a bracket 51.
2 is a piston 13a of the cross-feeding cylinder device 12;
The strength is set so that the plunger 15a cannot operate while the plunger 15a can move. On the other hand, the tip of the vertical feed drive lever 50 is arranged so that it can come into contact with the vertical feed lever 53 at both left and right end moving portions of the seedling stand 11, and the lever 53 is driven by a spring as shown in detail in FIG. It is biased to be held in a fixed position, and is interlocked with a vertical feed roller drive shaft 55 via a one-way clutch 56. A seedling vertical feed roller 57 is fixed to the drive shaft 51, and the seedling loading stand 11 is fixed to the roller 57.
A roller 59 rotatably supported below the
A conveyor belt 60 is stretched between.
A portion of the belt 60 passes through the seedling stand 11 and protrudes from the surface, so that the pine seedlings can be sent out in the vertical direction.

Since the present invention has the above configuration, as the rice transplanter 1 moves forward based on the rotation of the paddy wheels 2, the rotation of the engine 6 is controlled by the chain 25 and the sprocket 2.
6 and the engaging clutch plate 27 to the planter drive shaft 24, and the peak 7a at the tip of the planter 7 draws a movement locus 47 shown in FIGS. Scrape one pine seedling and plant it in the field. At the same time, the pump drive shaft 34 is also rotated via the chain 33, and based on the predetermined eccentricity of the three-stage eccentric cam 35,
Plunger pump 20 is driven. On this occasion,
The timing is specified so that the plunger pump 20 discharges during the downstroke of the planter 7, that is, between the movement trajectory a→b, and the pump 20 sucks during the upstroke of the planter 7, that is, between the movement trajectory b→a. ing. The oil discharged from the pump 20 is sent to the cross-feed cylinder device 12 via the cross-feed switching valve 21, and then transferred to the seedling stand 1 via the piston rod 13.
1, but since the timing is adjusted as described above, the peak 7a of the planter 7 is
When the seedling stand 11 is at this position, the lateral movement of the seedling stand 11 is started, and the lateral movement of the seedling stand 11 is stopped between the position b and the position a of the beak 7a. Note that when the beak 7a scrapes the pine seedlings on the seedling tray 11, the lateral feeding of the seedling tray 11 has started, but since the cam eccentricity has only just begun and the amount of cam eccentricity is small, the feeding rate is It is slow and the beak 7a does not become a hindrance when scraping the seedlings. In this way, the seedling stand 11 is moved intermittently in the lateral direction in synchronization with the planter 7, and when it reaches just before the moving end, for example, just before the left moving end, it is fixed to the back surface of the seedling stand 11. The operating lever 16a of the vertical feed switching valve 16 comes into contact with the stopper 17, and the lever 16a contacts the pressure oil side cylinder chamber 12b of the horizontal feed cylinder device 12.
is switched so that it communicates with the vertical feed cylinder device 15. However, even when the vertical feed switching valve 16 is switched, the spring 52 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. As a result, the piston 1 of the cross-feeding cylinder device 12 is further
3a moves and 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. Since the piston 13a cannot move, the pressure in the right cylinder chamber 12b increases, and therefore the pressure The oil is delivered against the spring 52 into the cylinder chamber of the longitudinal cylinder device 15. Due to the inflow of oil into the cylinder chamber, the plunger 15a expands and moves the vertical feed drive lever 50 via the bracket 51, and the lever 50 moves the vertical feed drive lever 53.
The lever 53 is rotated against the spring. The rotation of the vertical feed lever 53 is transmitted to the feed roller 59 via the one-way clutch 56 and the vertical feed drive shaft 55, and a predetermined amount of seedling conveyor belt 60 is transmitted to the feed roller 59.
is rotated to convey the pine seedlings on the seedling stand 11 toward the seedling receiver. At this time, the discharge of the plunger pump 20 into the cylinder chamber of the vertical feed cylinder device 15 corresponds to the scraping of the planter 7 at the final end of the seedling stand 11. Also,
The vertical feed cylinder device 15 is fixedly installed in the center of the two handles 8 via a reinforcing plate 18, and deformation due to twisting, bending, etc. of the handles 8 is small.
No excessive force is applied to the seedling stand 11, and therefore the vertical feed drive lever 50 and the vertical feed lever 53 do not shift, and the vertical feed drive lever 50 can be moved directly by the vertical feed lever 53 fixed to the plunger 15a. Since it is activated, it is possible to perform reliable vertical feeding. Further, the vertical feed cylinder device 15 is installed at a position relatively above the seedling stand 11 and extends upward, and the cylinder device 15 is covered from below with a reinforcing plate 18, so that muddy water etc. Hard to catch, and vertical feed cylinder device 1
Since the cylinder device 5 is protected by the two handles 8 and the reinforcing plate 18, damage caused by external forces such as collisions can be prevented, and the cylinder device 15 can be used for a long period of time. At the same time, due to the movement of the vertical feed drive lever 50, the lever 37 is rotated by an angle θ as shown by the chain line in FIG. 4 via the Bowden wire 49. Due to this rotation, the slide cam 36
is moved in the direction of the arrow against the spring 39, and is moved to a position where it can come into contact with the switching lever 38.
As a result, the switching levers 38 and 4 are rotated by the rotation of the slide cam 36 based on the pump drive shaft 34.
1 rotates, and the operating lever 43 is rotated against the spring 45. The rotation of the operating lever 43 in the direction of the arrow in FIG.
1a, and switches the lateral feed switching valve 21. Then, the oil in the cylinder chamber of the vertical feed cylinder device 15 is pushed out by the spring 52,
The oil is returned to the oil tank 22. As a result, the plunger 15a contracts, the vertical feed drive lever 50 also moves, and the contact with the vertical feed lever 53 is released, so that the lever 53 is returned to its home position by the spring. Furthermore, by switching the cross-feed switching valve 21, pressure oil is now delivered by the plunger pump 20 to the left cylinder chamber 12a of the cross-feed cylinder device 12, and from the first stroke in the next row, pressure oil is sent out in synchronization with the planter 7. Seedling stand 11
is traversed to the right.

By the way, for the number that changes the number of seedlings for one plant,
When changing the feeding amount of the seedling stand 11, operate the planter clutch to pull the Bowden wire 31, and then move the shift lever 29 via the spring 30.
is rotated to urge the meshing clutch plate 27 in the direction away from the meshing pawl 26a of the sprocket 26. At this time, if the outer surface of the clutch plate 27 is in contact with the stopper 32, the clutch plate 27 is engaged with the engaging pawl 26a by simply stretching the spring 30, but the notch 27a of the clutch plate 27 is in contact with the stopper 32. When the clutch plate 27 reaches the position, the clutch plate 27 moves based on the spring 30, releases the engagement with the engaging pawl 26a, and cuts off the transmission, and at the same time, the notch 2
7a engages with the stopper 32, and the clutch plate 2
7. Therefore, the planter drive shaft 24 is stopped. The rotational position of the planter drive shaft 24 in this state is defined so that the beak 7a of the planter 7 is exactly in the vicinity of the uppermost position a. Furthermore,
The drive shaft 24 is connected to a pump drive shaft 34 via a chain 33, and is defined so as to be at the lowest position L of the three-stage eccentric cam 35, that is, the position where the flat surface 35a abuts the plunger 20a. . As a result, the shift fork shaft 40 is moved by the grip 40a.
The discharge amount of the plunger pump 20 can be changed by sliding the three-stage eccentric cam 35 via the fork 39 and changing the eccentric amounts X ₁ , X ₂ , and X ₃ .

As explained above, according to the present invention, the discharge amount of the plunger pump 20 is changed by the multistage eccentric cam 35 to change the feeding amount of the seedling stand 11, so the plunger 20a is always in sliding contact with the cam 35. Therefore, it is possible to prevent the cam and plunger from being worn out prematurely due to a collision. Also,
When changing the feeding amount of the seedling table 11, when the planter clutch is disengaged and the planter 7 is stopped, the flat surface 35a of the multistage eccentric cam 35 moves against the plunger 2.
0a, the sliding of the eccentric cam 35 is not hindered by the stepped portion of the multi-stage eccentric cam 35, and the eccentric cam can slide smoothly. The amount of feed of the seedling stand 11 can be easily adjusted.

[Brief explanation of drawings]

Figure 1 is a side view showing a rice transplanter to which the present invention can be applied, Figure 2 is a perspective view of its rear part, Figure 3 is a hydraulic circuit diagram according to the present invention, and Figure 4 is a front view showing the 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 partially cutaway side view showing the seedling tray drive unit.
FIG. 7 is a plan sectional view thereof, FIG. 8 is a side view of the transmission part, and FIG. 9 is a sectional view of the multistage eccentric cam. 1...Rice transplanter, 7...Planter, 11...Seedling stand, 12...Horizontal feeding cylinder device, 20...
...Plunger pump, 20a...Plunger, 21...Transverse feed switching valve, 24...Planter drive shaft, 34...Pump drive shaft, 35...
Multistage eccentric cam, 35a...flat surface.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Rice planting in which a transverse feed cylinder device connected to a seedling rest is connected to a plunger pump, and the seedling rest can be moved laterally by the discharge of the plunger pump. In the machine, the plunger pump is driven by a multi-stage eccentric cam that is slidably supported on a pump drive shaft, and the pump drive shaft is connected to a planter drive shaft,
The seedling stand feeding device is configured such that when the planter drive shaft stops, the flat surface of the multi-stage eccentric cam comes into contact with the plunger of the plunger pump. (2) The seedling rack feeding device according to claim 1, wherein the planter drive shaft is configured to stop only near the uppermost position of the planter.