JPS6130524B2 - - 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.
Concerning the improvement of the issue.

In the patent application, the vertical feed switching valve is switched in advance in the previous stroke of the horizontal feed movement end of the seedling tray, and the oil discharged from the plunger for the next horizontal feed of the seedling tray is transferred to the cylinder chamber of the vertical feed cylinder device. A strong spring was installed to prevent the plunger of the longitudinal cylinder from moving while the transverse cylinder could move. For this reason, when vertically feeding seedlings, the internal pressure of the hydraulic system becomes extremely high, causing oil to leak from each switching valve, etc., making it impossible to obtain the specified vertical feeding stroke, resulting in an insufficient number of seedlings to be planted. It often happened that I put it away.

Therefore, the present invention is configured such that the switching timing of the vertical feed switching valve is instantaneously switched by a spring when the seedling tray reaches the end of the horizontal feed movement or in the vicinity thereof, and the spring of the vertical feed cylinder device is The object of the present invention is to provide a seedling stand feeding device for a rice transplanter which eliminates the above-mentioned drawbacks by requiring only a weak force to return the plunger.

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 9 is provided at the rear of the frame 5, and a seedling stand 11 is provided on the handle 9 so as to be slidable by a slide piece 10. Further, a seedling receiver 12 is arranged so that the lower end of the seedling rest 11 comes into sliding contact, and a seedling leaf pressing plate 13 is fixed to the lower end of the seedling rest 11. Furthermore, as shown in detail in FIG. 2, a cross-feeding cylinder device 15 consisting of a double-acting cylinder is fixed to the handle 9 via a bracket 16 on the back side of the seedling stand 11.
Rods 17 protruding from both ends of the seedling stand 11 are fixed to the seedling stand 11 via brackets 19.
Further, a vertical feed cylinder device 20 made of a single acting cylinder is fixed to the handle 9, and a lug 22 is fixed to the tip of a plunger 21 of the cylinder device 20. A spring 23 that urges the plunger 21 toward the cylinder chamber 20a is fixed to the lug 22, and its tip can come into contact with the vertical feed lever 24. The lever 24 is connected to a pulley 26 via a one-way clutch 25, and the pulley 26 is connected to a longitudinal belt 27.
can be driven. On the other hand, a transmission case 29 is fixed to the rear end of the frame 5, as shown in FIGS. 3 and 4, and a chain 30,
A pump drive shaft 33, to which power is transmitted via a sprocket 31 and a planter clutch 32, is rotatably supported. An eccentric cam 35 is fixed to the pump drive shaft 33, and the cam 35 can contact a plunger 36a of a plunger pump 36 to drive the pump. Further, the pump drive shaft 33 is connected to a planter drive shaft 39 via a chain 37, and the drive shaft 39 is connected to a slide cam 4.
0 is supported so that it can only slide freely, and its both ends protrude from the case 29 and are connected to the planter 7. Further, as shown by the solid line in FIG.
One end 43a of a lever 43 is in contact with the lever 43, which is biased by the spring 42 and can be slid against the switching arm 41 against the spring 42. The other end 43b of the lever 43 projects outside the case 29, and is connected to the lug 22 of the vertical feed cylinder 20 via a Bowden wire 45. In addition, the switching lever 41 is connected to the case 29.
The tip of the lever 47 is connected to a washer 51 fixed with a nut 50 to the lower end of a timing stopper rod 49 which is slidably supported by the case 29. is in contact with. stopper rod 4
9 is urged upward by a spring 52, and its upper end partially protrudes from the case 29. Further, a block 53 is fixed above the transmission case 29, and the block 53 has the plunger pump 36 formed therein, as well as a vertical feed switching valve 55 and a horizontal feed switching valve 55.
6 is formed. Further, an oil tank 57 is fixed above the block 53, and a seedling box 60 for the spare seedlings 59 is inserted through the block 53 and the oil tank 57.
At the top, there is a switching dial 6 that can adjust the stroke, that is, the discharge amount of the plunger pump 36.
1 is arranged. Further, as shown in FIGS. 3 and 6 to 11, the operating shaft 55a of the vertical feed switching valve 55 has a rearwardly protruding portion shaped like a letter when viewed from the front and a U-shape when viewed from the side. A bent operating lever 62 is fixed, and the lever 62 has a pin 63 fixed to its intermediate bent portion and a notch 62 of approximately 90 degrees in its pivot portion.
The notch 62a cooperates with a stopper pin 64 fixed to the block 53 to limit the movement of the lever 62. Furthermore, a pin 65 is fixed to the tip of the lever 62 so as to protrude rearward, and the pin 65 is fixed to the tip of the seedling leaf holding plate 13.
The lever 62 can be switched by coming into contact with a stopper 66 fixed to the lever. Further, a curved operating lever 67 is fixed to the operating shaft 56a of the lateral feed switching valve 56 at an intermediate portion thereof. A pin 69 is fixed to one end of the lever 67, a spring 70 is tensioned between the pin 69 and the pin 63 of the lever 62, and a plate 71 is attached to the other end of the lever 67. The plate 71 is fixed to the timing stopper 4.
9. Furthermore, a V-shaped stopper plate 72 is fixed to the block 53 adjacent to the lever 67.
The pivot position of the lever 67 is restricted by contacting the side surface of the lever 67. Further, as shown in FIG. 5, the oil tank 57 communicates with one cylinder chamber 15a of the lateral feed cylinder device 15 via the plunger pump 36 and the lateral feed switching valve 56.
It branches and communicates with the cylinder chamber 20a of the vertical feed cylinder device 20 via the vertical feed switching valve 55. On the other hand, the other cylinder chamber 15b of the cross-feed cylinder device 15 is connected to the cross-feed switching valve 5.
It communicates with the oil tank 57 via 6, and
It branches and communicates with the cylinder chamber 20a of the vertical feed cylinder device 20 via the vertical feed switching valve 55. The switching timing of the vertical feed switching valve 55 by the operation lever 62 is set to be switched at or near the stroke end of the horizontal feed cylinder device 15, that is, when the seedling stand 11 reaches the moving end. In addition, in FIG. 3, 7a indicates a beak at the tip of the planter 7, and 75 indicates a locus drawn by the tip of the beak. In addition, in FIGS. 3 and 12, a to b indicate the discharge stroke of the plunger pump 36, that is, the horizontal feeding of the seedling stand 11 or the vertical feeding of the seedlings,
b' is the switching position of the vertical feed switching valve 55, c is the switching position of the horizontal feed switching valve 56, d is the position where the seedlings are scraped by the beak 7a, e to b are the stop positions of the planter by the planter clutch 32, and Section x indicates the final horizontal feed stroke, y indicates the vertical feed stroke, and z indicates the starting crosswise feed stroke by turning.

Since the present invention has the above configuration, as the engine 6 rotates, the paddy wheel 2 rotates and the rice transplanter 1 moves forward, and the pump drive shaft 33 rotates via the chain 30 etc. A planter drive shaft 39 rotates via 37 and the like. As a result, the planter 7 is driven to scrape off a predetermined number of seedlings on the seedling stand 11, and at the same time, the planter 7
The plunger pump 36 is driven based on the eccentric cam 35 in synchronization with the pump, and the oil discharged by the pump is
Oil is supplied to the cylinder chamber 15a of the transverse feed hydraulic cylinder device 15 via the transverse feed switching valve 56, and the seedling stand 11 is moved via the rod 17 at a predetermined pitch. In this way, the seedling stand 1 is moved laterally intermittently in synchronization with the planter 7, and when it reaches the right end of movement as shown in FIG. The stopper 66 shown in FIG.
The lever 62 is rotated against the spring 70 as shown in FIG. At the position where the lever 62 is urged in the opposite direction by exceeding its maximum extension point, the stopper pin 64 abuts against the opposite end surface of the notch 62a, and the lever 62 is stably held. At this time, the lateral feed switching valve 56
The operating lever 67 is held in position by a stopper 72 and a timing stopper rod 49. That is, as shown in FIG. 12a, the vertical feed switching operation lever 62 is brought into contact with the stoppers 64 and 72 by the torque P ₁ 'S ₁ , and the horizontal feed switching operation lever 67 is brought into contact with the stoppers 64 and 72 by the torque P ₁ l _1. Once the device is in a stable state, rotate the operating lever 62 using the pin 65 as shown in FIG. 12b.
When the pin 63 crosses the consideration point A, the spring 70
It is instantly switched to the stable position B by the stopper 64. In this position, the operating lever 62 is operated by the torque P ₂ 'S ₂ and the operating lever 62 is
7 is the stopper 6 due to the torque P ₂ l ₂ .
4,49 to maintain stability. This switching of the operating lever 62 is performed at the final discharge end to the cross-feeding cylinder device 15, that is, at the moving end of the seedling stand 11, as shown at point b' in FIG.
As shown in FIG. b, the horizontal feed switching valve 55 is switched, and the cylinder chamber 20a of the vertical feed cylinder device 20 communicates with the high pressure oil side. Then, at position d (FIG. 13) of the suction stroke of the plunger pump 36, the beak 7a scrapes off the seedlings at the final end of the transverse feed, and then the plunger pump 36
6, the discharged oil is sent to the cylinder chamber of the vertical feed cylinder device 20, the plunger 21 expands against the spring 23, the lug 22 comes into contact with the vertical feed lever 24, and the Rotate the lever 24. The rotation of the vertical feed lever 24 is transmitted to the pulley 26 via the one-way clutch 25, and the pine seedlings on the seedling tray 11 are further conveyed by a predetermined amount toward the seedling receiver 12 by the vertical feed belt 27. At the same time, as the plunger 21 moves, the lever 43 rotates via the Bowden wire 45, and the slide cam 40 moves against the spring 42, causing the switching lever 41 to move its protrusion 40.
a is moved to a position where it can make contact. This results in
Slide cam 40 based on planter drive shaft 39
This rotation causes the switching lever 41 to rotate, which in turn causes the lever 47 to rotate via the shaft 46, causing the timing stopper rod 49 to slide downward against the spring 52. Then, the rod 49 that had protruded upward and was in contact with the plate 71 of the lateral feed switching operation lever 67 is retracted, and the restraining arm of the lever 67 is released, so that the lever 67 is moved based on the spring 70 as shown in FIG. 8a. The lever 67 is stably held by the stopper 72 being brought into contact with the lever 67. That is, as shown in FIG. 12c, the operating lever 67 is instantaneously rotated to a stable position by the stopper 72 based on the above-mentioned torque P ₂ l ₂ , and in this position, the operating lever 62 is rotated by the torque P ₃ 'S ₃ . ,
Further, the operating lever 67 is stably held by coming into contact with the stoppers 64 and 72, respectively, due to the torque P ₃ l ₃ . Next, as shown in FIGS. 3 and 13, the next row of seedlings is scraped off at position d during the pump suction stroke, and is further delayed by a predetermined amount from the vertical feed stroke Y for the vertical feed cylinder device 20 shown at point c. In the position
As shown in FIG. 8b, the horizontal feed switching valve 56 is switched, and the oil in the cylinder chamber 20a of the vertical feed cylinder device 20 is pushed out by the spring 23 and returned to the oil tank 57. As a result, the plunger 21 is retracted, the lug 22 is released from contact with the longitudinal feed lever 48, and the lever 48 is therefore returned by the spring, but the one-way clutch 25
The pulley 26 does not rotate due to this action.
The sliding movement of the plunger 21 is also transmitted to the lever 43 via the Bowden wire 45, and the spring 42 returns the slide cam 40 to a position where it does not overlap with the switching lever 41. At the same time, the timing stopper rod 49 is moved upward by the spring 52. The plate 71 of the operating lever 67 protrudes
The lever 67 is held in cooperation with the stopper 72. Also, by switching the cross feed switching valve 56, the cross feed cylinder device 15
Plunger pump 3 is installed in the right cylinder chamber 15b of
6 is sent out, and the seedling stand 11 is moved laterally to the left in synchronization with the planter 7. In addition, as shown in Figure 9, seedling stand 1
1 reaches the left moving end, the stopper 66 comes into contact with the pin 65 of the vertical feed switching operation lever 62,
As shown in FIG. 10, the lever 62 is instantaneously rotated past the point against the spring 70, and at this position, the lever 62 is stably held by contacting the opposite end surface of the notch 62a of the stopper pin 64. . As a result, as described above, the vertical feed switching valve 55 is switched so that the high pressure side communicates with the cylinder chamber 20a of the vertical feed cylinder device 20, pressure oil is sent to the vertical feed cylinder device 20, and the seedlings are fed vertically. At the same time, the lever 43, the slide cam 40,
Timing stopper rod 49 is pulled down via switching levers 41 and 47. Then, the first
As shown in FIG. 1, the lever 62 is released from contact with the plate 71, and the traverse feed switching operation lever 67 is instantaneously rotated by the spring 70 and comes into contact with the opposite side of the stopper 72 to be stably held. As a result, the cross-feed switching valve 56 is switched, and the seedling stand 11 is moved to the right again.

As explained above, according to the present invention, the switching timing of the vertical feed switching valve 55 is set to be switched instantaneously based on the spring 70 when the seedling platform 11 reaches the end of the horizontal feed movement or in the vicinity thereof. Therefore, the vertical feed cylinder device 20
The spring 23 only needs a force to return the plunger 21, and does not require a strength greater than the internal pressure during traverse feeding. This prevents the pressure from becoming higher than necessary to compress the spring 23 during vertical feeding of the seedlings, so each switching operation valve 55, 56
The stroke of the plunger 21 can be maintained accurately, the vertical feeding of the seedlings is accurate, and there is no shortage of planted seedlings. Further, the vertical feed switching operation lever 62 is rotated near the horizontal feed moving end of the seedling tray 11 to switch the vertical feed switching valve 55 and the spring 70 is moved beyond the point of rotation to switch the vertical feed switching valve 55. 1, the movable stopper 49 is removed and the lateral feed switching operation lever 67 is rotated to switch the lateral feed switching valve 56 based on the spring 70 that has exceeded the desired point.
The switching operation levers 62, 67 for vertical and horizontal feeding can be rotated in relation to each other by the spring 70, and although the configuration is extremely simple, the switching operation levers 62, 67 can be operated by the toggle action of the spring 70. can be rotated instantaneously at a predetermined timing, and the seedling stand 11 can always be moved at appropriate horizontal and vertical feeding timings.

[Brief explanation of the drawing]

Fig. 1 is an overall side view showing a rice transplanter to which the present invention is applied, Fig. 2 is an enlarged partially sectional side view showing the back of the seedling tray, and Fig. 3 is an enlarged side sectional view showing the rear of the machine. Figure 4 is a rear sectional view, Figure 5
The figure is a hydraulic circuit diagram, Figures 6 to 11 are views showing the vertical feed switching valve and operating lever, and the horizontal feed switching valve and operating lever in different states, a is a front view of both operating levers,
12b is a sectional view of both valves, FIGS. 12a, b, and c are schematic diagrams showing the force relationships of both operating levers in different states, and FIG. 13 is a diagram showing the timing of the plunger pump and both switching valves. . 1...Rice transplanter, 11...Seedling stand, 15...Horizontal feed cylinder device, 20...Vertical feed cylinder device, 4
9...Movable stopper (timing stopper rod), 55...Vertical feed switching valve, 56...Horizontal feed switching valve, 62...Vertical feed switching operation lever,
67...Transverse feed switching operation lever, 62a, 64,
72...Stopper, 70...Spring, b'...Moving end of seedling platform.

Claims (1)

[Claims] 1. Send oil to the cross-feed cylinder device via the cross-feed switching valve to feed the seedling stand laterally,
In a rice transplanter that vertically feeds the seedling stand by supplying oil to the vertical feed cylinder device via the vertical feed switching valve, the horizontal feed switching operation lever connected to the horizontal feed switching valve is connected to the vertical feed switching valve. A spring is installed between the vertical feed switching operation lever and the vertical feed switching operation lever, and the rotation range of both operation levers is restricted by a stopper, and the horizontal feed switching operation lever is movable in conjunction with switching of the vertical feed switching valve. regulating with a stopper, and interlocking the vertical feed switching operation lever with the seedling tray, switching the vertical feed switching valve near the horizontal feed movement end of the seedling tray and moving the spring beyond the desired point;
Furthermore, the rice transplanter is configured to remove the movable stopper by switching the switching valve of the vertical feed switching valve, and to rotate the horizontal feed switching operation lever based on the spring that has exceeded the consideration point to switch the horizontal feed switching valve. Platform feeding device.