JPS6137883B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a riding type rice transplanter, and more specifically, the present invention relates to a riding type rice transplanter, in particular, a riding type rice transplanter in which an auxiliary seedling platform maintains a seedling supplying posture relative to the seedling platform only when supplementary seedlings are required to be supplied. This relates to a type rice transplanter.

Some riding rice transplanters have conventionally been constructed by connecting a planting work machine to a passenger car body, and a hydraulic cylinder (hereinafter referred to as the first hydraulic cylinder) is installed on the planting work machine side of the passenger car body. Some models are equipped with an auxiliary seedling platform that can be tilted or raised and lowered by operation to take the seedling supply position, and there is also a mechanism that connects the planting machine to the passenger vehicle body. It is equipped with a hydraulic cylinder (hereinafter referred to as the second hydraulic cylinder) that raises and lowers the attached work machine, and by controlling the operation of this second hydraulic cylinder, the passenger vehicle body is moved against the rice field along the depth and shallowness of the plowing plate in the rice field. Some plants are designed so that the height of the planting machine relative to the field surface remains constant even when it moves up and down, and the planting depth of the seedlings remains constant.

This type of riding rice transplanter is equipped with an automatic stop device that cuts off power transmission to both the traveling mechanism of the passenger vehicle body and the planting machine, and when the amount of seedlings remaining on the seedling platform falls below a predetermined amount, When the seedling platform is located at the center in the width direction of the planting machine, that is, when the seedling platform has completed the auxiliary seedling receiving posture, the automatic stop is activated, and in conjunction with this, the first hydraulic pressure is activated. The cylinder is actuated to cause the auxiliary seedling stand to assume a seedling supplying position.

However, as mentioned above, after the seedling platform stops at the center in the width direction of the planting machine and is ready to receive auxiliary seedlings, the first hydraulic cylinder is activated and the auxiliary seedling platform tilts to supply seedlings. In the case of the type that takes a posture, it takes a long time to complete the seedling replenishment posture, which hinders the efficiency of rice transplanting work. In order to eliminate this drawback, it would be sufficient if the auxiliary seedling holder completed the seedling supplying position before the seedling mounting stand completed the auxiliary seedling receiving position, that is, during the planting operation. The height of the work machine is automatically adjusted relative to the vehicle body during the planting work by the operation of the second hydraulic cylinder, so the vertical position of the seedling platform equipped on this work machine is adjusted automatically. Controlling the operation of the first hydraulic cylinder during the planting operation to follow the fluctuations and causing the auxiliary seedling platform to assume the seedling supplying position results in an extremely large power loss.

Therefore, the present invention provides a switching valve mechanism that controls the supply of pressure oil to a first hydraulic cylinder for causing the auxiliary seedling platform to adopt a seedling supply posture, and a spool of this switching valve mechanism that is installed in a passenger vehicle body. The spool operating mechanism is provided with a spool operating mechanism that performs a switching operation in conjunction with the expansion and contraction operation of a second hydraulic cylinder that raises and lowers the attached work machine, and a switch mechanism that operates this spool operating mechanism only when seedling replenishment is necessary, at least when seedling replenishment is necessary. Before the seedling stand was ready to accept auxiliary seedlings,
To provide a riding type rice transplanter which reduces power loss and can supply seedlings in a short time by configuring an auxiliary seedling mounting stand to complete the seedling supplying posture.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 11 indicates the rear part of the passenger vehicle body 1, with the running wheels, driver's seat, engine mounting part, etc. not shown, and a planting machine 3 is connected to the rear of the vehicle body 1 via a connecting mechanism 2. There is. The planting work machine 3 has a seedling platform 3 on the top of the machine body 31.
2, the seedling mounting platform 32 has its upper end facing the front passenger vehicle body 1 side and its lower end facing the rear, and the seedling mounting surface that extends in the width direction of the planting machine 3 is a sliding platform. It is designed to repeat left and right reciprocating motions in the width direction of the planting machine 3 while keeping it tilted. Further, a float 34 is attached to the lower part of the fuselage 31 via a telescopic link joint 33.

The connection mechanism 2 is rotatably attached to a support 12 provided at the rear part 11 of the passenger vehicle body 1 and a connection body 35 provided at the front of the body 31 of the planting machine 3, and is passed between them. Upper and lower two connecting rods 2
1 and 22, and a second hydraulic cylinder 23 installed between the upper one 21 of these connecting rods and the rear part 11 of the passenger vehicle body 1.
is rotatably mounted with the tip of the rod 23a on the rear side of the passenger vehicle body 1 and the mounting base end of the main body 23b on the connecting rod 21 side. Thereby, the planting machine 3 is raised and lowered in the vertical direction with respect to the passenger vehicle body 1 as the second hydraulic cylinder 23 expands and contracts.

On the other hand, a lift mechanism 4 is provided at the rear part 11 of the passenger vehicle body 1.
An auxiliary seedling stand 41 supported horizontally is provided. That is, a support post 42 is erected on the rear part 11 of the passenger vehicle body 1, and at a suitable position on the top thereof, two connections are provided that extend substantially horizontally in parallel to each other toward the side of the seedling platform 32 of the planting machine 3. One ends of the rods 43 and 44 are rotatably attached. The other end of this connecting rod 43 is placed near the seedling supply port end 41a of the auxiliary seedling mounting stand 41, that is, the one end facing the seedling mounting table 32, and the other end of the connecting rod 44 is located near the seedling feeding port end 41a of the auxiliary seedling mounting stand 41. A parallel link mechanism is formed by being rotatably attached to attachment portions 41b that protrude downward from the respective attachment portions 41b. The first hydraulic cylinder 45 is constructed by rotatably attaching the tip of the rod 45a to the upper connecting rod 43 and the base end of the main body 45b to the support 12 provided at the rear of the passenger vehicle body 1. has been done. As a result, the first hydraulic cylinder 45 operates and its rod 45a expands and contracts.
The auxiliary seedling mounting table 41 maintains a horizontally mounted attitude and moves up and down in the vertical direction. In this case, the seedling supply end 41a of the auxiliary seedling mounting stand 41 is connected to the support 4 of the connecting rod 43.
2 and the circular arc determined by the attachment positions 43a and 43b of the auxiliary seedling mounting base 41 with respect to the attachment part 41b, that is, the circular arc whose rotation center is approximately the same position as the attachment position 43a and whose rotation radius is the distance between the attachment positions 43a and 43b. draw. Here, the planting work machine 3
When the seedling table 32 is raised and lowered as the second hydraulic cylinder 23 expands and contracts, the upper end of the seedling platform 32 draws an arc with a predetermined center of curvature and a predetermined radius of curvature. almost coincides with this center of curvature, and the distance between the mounting positions 43a and 43b is made almost equal to this radius of curvature, so the trajectory drawn by the seedling supply opening end 41a of the auxiliary seedling stand 41 and the seedling stand The locus drawn by the upper ends of 32 is substantially the same arc, and they can maintain close positions without interfering with each other no matter where they are located.

Next, according to FIG. 2, the operation of the second hydraulic cylinder 23 constituting the coupling mechanism 2 is controlled,
A mechanism for automatically adjusting the relative height of the planting machine 3 with respect to the passenger vehicle body 1 will be explained. Planting work machine 3
A balance lever 35 is attached near where one end of the link joint 33 of the body 31 constituting the body is attached, and one end of this lever 35 is connected to the sensor rod 3.
6 to the bracket 34a of the float 34, and the other end is attached to one end of the operating wire 51 via a tension spring 37.
When the rod moves upward due to buoyancy, the sensor rod 3
6 also moves upward, and along with this, the balance lever 35
rotates, and the operating wire 5 is connected via the tension spring 37.
1 is being pulled. The other end of this operating wire 51 is connected to the second hydraulic cylinder 2.
The switching valve mechanism 5 is connected to one end of the spool 52 of the switching valve mechanism 5, which is integrally formed with the main body 23b of the switching valve mechanism 3. This spool 52 is always biased by a compression spring 53 in a direction opposite to the direction in which the operating wire 51 is pulled, and the switching valve mechanism 5 is switched in balance with the pulling force of the operating wire 51. There is. This switching valve mechanism 5 has a configuration as shown in FIG. 3, and has a neutral position N where each port is blocked, a switching position A where the second hydraulic cylinder 23 is extended, and a switching position where it is retracted. It is a 3-position, 4-port, 4-way switching valve that switches between B and B. Of these four ports, two ports 5a and 5b are open to the peripheral wall of the main body 23b of the second hydraulic cylinder 23, and the port 5a is connected to the discharge port 55a of the oil pump 55 via a conduit 54.
Further, the port 5b is communicated with an oil tank 57 via a conduit 56. remaining 2
The ports 5c and 5d are connected to the second hydraulic cylinder 23.
The port 5c is opened inside the main body 23b of the second
The port 5d is communicated with the extension side hydraulic chamber 23c and the retraction side hydraulic chamber 23d of the hydraulic cylinder 23, respectively, and when the operation wire 51 is pulled, the switching valve mechanism 5 is switched to the switching position A. When the tensile force of the operating wire 51 becomes less than a predetermined value, the switch is switched to a switching position B, and then to a neutral position N where the tensile force of the wire 51 and the biasing force of the compression spring 53 are in equilibrium.

Further, according to the present invention, as shown in FIGS. 2 to 4, there is provided a spool switching valve mechanism 6 that controls the supply of pressure oil to the first hydraulic cylinder 45, and a spool switching valve mechanism 6 that controls the supply of pressure oil to the first hydraulic cylinder 45, and a spool switching valve mechanism 6 that controls the supply of pressure oil to the first hydraulic cylinder 45. 23
The spool operating mechanism 7 is provided with a spool operating mechanism 7 that is switched according to the expansion and contraction of the spool, and a switch mechanism 8 that operates the spool operating mechanism 7 only when seedling supply is required. That is, as shown in FIG. 2, one end of the operating wire 71 is attached to the main body 23b of the second hydraulic cylinder 23 forming the coupling mechanism 2. As shown in FIG. The other end of this operating wire 71 is attached to one end of the spool 61 of the spool switching valve mechanism 6 that is integrally formed with the main body 45b of the first hydraulic cylinder 45, and is connected to the spool 61 of the spool switching valve mechanism 6 that is integrally formed with the main body 45b of the first hydraulic cylinder 45. The spool 61 is switched in accordance with the operation, thereby forming a spool operation mechanism 7. The spool 61 has a compression spring 6
2 is always energized in a direction opposite to the pulling direction of the operating wire 71, and the spool switching valve mechanism 6 is switched in balance with the pulling force of the operating wire 71. Also,
A solenoid SOL1 is provided on the side of the spool 61 to which the operating wire 71 is attached, and its operation also causes the switching valve mechanism 6 to switch. That is, as shown in FIG. 3, the spool switching valve mechanism 6 is at the neutral position M where each port is blocked.
It is a 3-position, 4-port, 4-way switching valve that switches between a switching position C in which the hydraulic cylinder 45 is extended and a switching position D in which it is retracted. Two ports 6a and 6b among these four ports are connected to the main body 45 of the hydraulic cylinder 45.
b, and the port 6a is connected to the middle of the pipe line 54 via the pipe line 63 and communicated with the oil pump 55, and the port 6b is opened to the middle of the pipe line 56 via the pipe line 64. Connected oil tank 5
It is connected to 7. the remaining two ports 6c,
6d is opened inside the main body 45b of the first hydraulic cylinder 45, and the port 5c is opened inside the main body 45b of the first hydraulic cylinder 45.
The port 5d is communicated with the extension side hydraulic chamber 45c and the retraction side hydraulic chamber 45d, respectively, and when the operation wire 71 is pulled or the solenoid SOL1 is activated, the switching valve mechanism 6 is switched to the switching position C. At the same time, when the tensile force of the operating wire 71 becomes less than a predetermined value, the switch is switched to the switching position D, and when the forces of the compression spring 62 and the operating wire 71 are in an equilibrium state, the switch is switched to the neutral position N.

Then, as shown in Figure 4, the above solenoid
A switch mechanism 8 is provided to control the power supply to SOL1, and during planting work other than when replenishing seedlings, the solenoid SOL1 is operated and the operating wire 71
movement is prevented from being transmitted to the spool 61. The switch mechanisms indicated by S ₁ to _{S 6} in FIG. 4 are seedling remaining amount detection switches, which are installed at appropriate positions on each seedling mounting surface (not shown) of the seedling mounting table 32.
The contact is closed when the number of pine seedlings on the seedling placement surface (not shown) falls below a predetermined amount. Further, R is a relay switch, and when the coil is energized, a normally open contact Ra is closed and a normally closed contact Rb is opened. Code Sc is planting machine 3
A seedling platform 3 that reciprocates left and right in its width direction
2, the seedling mounting table 32 moves to the planting machine 3.
This is a center position detection switch that closes the contact point when it is located at the center in the width direction, that is, when it is in the auxiliary seedling receiving posture. Furthermore, the sign C ₁
C2 is the coil of the solenoid SOL1 described above, and _C2 is the coil of the solenoid SOL2 described below. The solenoid SOL2 is a solenoid built into an electromagnetic switching valve (not shown) for operating an automatic stop device (not shown), and when this operates, the main clutch (not shown) is disconnected by hydraulic drive, and the passenger car body 1 is turned off. The movement of each part of the planting work machine 3 stops when the machine stops running.
A coil is then connected via each of the above-mentioned switches between the positive lead wire 8A and the negative lead wire 8B from the battery provided at an appropriate location in the passenger vehicle body 1.
C ₁ and C ₂ are connected. That is, the remaining seedling quantity detection switches _S1 to _S6 are connected in parallel with each other, and the relay switch R is connected between the lead wires 8A and 8B via this group of switches. In parallel, a solenoid SOL is connected between the lead wires 8A and 8B via the normally open contact Ra of the relay switch R and the central position detection switch Sc.
The coil C 2 of the solenoid SOL ₁ is connected to the coil C 1 of the solenoid SOL ₁ via the normally closed contact Rb of the relay switch R.

In the riding-type rice transplanter configured as described above, the coil _C1 of the solenoid SOL1 is always energized, so the spool 61 of the spool switching valve mechanism 6 is attracted to one end, and is released from the operation of the operating wire 71 to switch the spool The switching valve mechanism 6 is switched to the switching position C. As a result, pressure oil from the oil pump 55 is supplied to the extension-side hydraulic chamber 45c of the first hydraulic cylinder 45, and the rod 45a is extended, and the auxiliary seedling platform 41 is placed above the upper end of the seedling platform 32. It is supported in an almost horizontal position. Then, being towed by the passenger vehicle body 1 on which auxiliary pine seedlings are placed on the auxiliary seedling platform 16, the planting machine 3 plants the seedlings on the rice field.

Next, the seedling mounting surface of the seedling mounting stand 32 (not shown)
Any one of the pine seedlings above,
When the amount falls below a predetermined amount, one of the remaining seedling amount detection switches _S1 to _S6 shown in FIG. 4, which correspond to the pine seedlings, detects this and closes the contact. Then, relay switch R is energized, and contact Ra is connected accordingly.
closes and contact Rb opens. As a result, the coil C ₂ of the solenoid SOL2 becomes energized when the central position detection switch Sc is closed, and the power supply to the coil C ₁ of the solenoid SOL1 is cut off, and the spool 61 of the spool switching valve mechanism 6 becomes energized. The user is released from the suction force of , and is also operated by the operating wire 71 . The spool 61 is operated in conjunction with the expansion and contraction of the second hydraulic cylinder 23.
When the planting work machine 3 moves upward with respect to the passenger vehicle body 1 through an extension operation, the first hydraulic cylinder 45 also extends in conjunction with this. Furthermore, when the second hydraulic cylinder 23 is retracted, the spool 61 is similarly operated in conjunction with the first hydraulic cylinder 45.
Also works as a retractor. As a result, when the passenger vehicle body 1 moves up and down with respect to the rice field along the depth and shallowness of the plowing plate in the rice field, the passenger vehicle body 1 is moved so that the planting machine 3 always maintains a constant position in the height direction with respect to the rice field. Even if the position is automatically adjusted in the height direction, the auxiliary seedling stand 41
The seedling supply opening end 41a follows the upper end of the seedling platform 32 installed on the planting machine 3, and maintains a position that allows for immediate supply of auxiliary seedlings.

As mentioned above, the auxiliary seedling mounting stand 41 is the seedling mounting stand 32.
While moving up and down following , the seedling platform 32 continues to reciprocate from side to side, and eventually locates at the center of the planting machine 3 in the width direction. Then, the center position detection switch Sc shown in Fig. 4 closes the contact, and the solenoid
Coil _C2 of SOL2 is energized. As a result, the solenoid SOL2 is actuated, the main clutch (not shown) is disconnected, the passenger vehicle body 1 stops running, the movement of each part of the planting machine 3 is stopped, and the seedling platform 32 is ready to receive auxiliary seedlings. complete.

When auxiliary seedlings are replenished on the seedling mounting surface (not shown) of the seedling mounting table 32, the remaining seedling amount detection switch, which had closed its contact, opens its contact. Then, relay switch R is no longer supplied with power, and its contacts Ra and Rb return to their normal states, with contact Ra opening and contact Rb closing. This causes the coil of solenoid SOL2 to
_C2 is de-energized, the main clutch (not shown) is connected, the passenger vehicle body 1 starts running, and the motion of each part of the planting machine 3 is resumed, so that the rice planting work of seedlings is resumed. Further, when the contact point Rb closes, the coil _C2 of the solenoid SOL1 is supplied with power, the spool switching valve mechanism 6 is switched to the switching position C, and the first hydraulic cylinder 45 is extended. As a result, the auxiliary seedling platform 41 is released from the following relationship with the seedling platform 32, moves upward, and is supported substantially horizontally at a predetermined position.

As explained above, according to the present invention, the switching valve mechanism that controls the supply of pressure oil to the first hydraulic cylinder that causes the auxiliary seedling platform to assume the seedling supplying posture, and the spool of this switching valve mechanism, can be installed in a passenger car. It is equipped with a spool operating mechanism that operates in conjunction with the expansion and contraction of a second hydraulic cylinder that raises and lowers the planting machine relative to the body, and a switch mechanism that operates this spool operating mechanism only when it is necessary to supply seedlings. Therefore, only when seedlings need to be replenished, the auxiliary seedling tray follows the positional changes of the seedling tray and maintains the seedling supply posture, and the auxiliary seedlings are replenished immediately after the automatic stop, and the power is applied to drive the auxiliary seedling tray to follow It is possible to supply seedlings in a short time without spending a lot of money.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted side view of an embodiment of the riding rice transplanter according to the present invention, Fig. 2 is a side view showing the main parts partially in section, and Fig. 3 is a side view showing the main parts. FIG. 4 is a circuit diagram showing the switch mechanism. 1... Passenger vehicle body, 2... Connection mechanism, 3... Planting work machine, 4... Lift mechanism, 5... Switching valve mechanism,
6...Spool switching valve mechanism, 7...Spool operating mechanism, 8...Switch mechanism, 23...Second hydraulic cylinder, 32...Seedling mounting stand, 41...Auxiliary seedling mounting stand, 45...First Hydraulic cylinder, 61...spool, SOL1... solenoid.

Claims (1)

[Claims] 1. A first hydraulic cylinder that causes an auxiliary seedling platform provided on the passenger vehicle body to adopt a seedling supply posture, and a second hydraulic cylinder that raises and lowers a planting machine connected to the passenger vehicle body to adjust the planting depth to a constant level. A riding rice transplanter equipped with a hydraulic cylinder, a switching valve mechanism for controlling pressure oil supply to the first hydraulic cylinder, and a spool of the switching valve mechanism linked to the expansion and contraction operation of the second hydraulic cylinder. a spool operating mechanism that switches between the
It is equipped with a switch mechanism that activates this spool operating mechanism when seedlings need to be replenished, and when seedlings need to be replenished, the auxiliary seedling holder can be moved to follow the positional changes in the height direction of the seedling holder installed in the planting machine. A riding-type rice transplanter characterized by being configured such that the rice transplanter maintains a seedling supplying posture.