JP2830255B2 - Seedling plant - Google Patents

Description

The present invention relates to a hydraulic cylinder for pitching control for shunting hydraulic oil from a single hydraulic pump to vertically control a seedling planting work section, and a seedling. The present invention relates to a seedling transplanter having a hydraulic circuit configured to send a hydraulic circuit to a rolling control hydraulic cylinder that controls the horizontal inclination of a planting work unit.

[Conventional technology and its problems]

Conventionally, this type of seedling plant has a hydraulic cylinder for pitching control and a hydraulic cylinder for rolling control for controlling the inclination of the seedling-planting work section from side to side. Is set by the flow dividing ratio of the flow dividing valve.

In the case of a seedling machine, if the pitching control does not operate at the predetermined operating speed, the floating seedlings are not quickly corrected when the seedling-planting work section is raised with respect to the topsoil surface, and the seedlings cannot be planted in the field. It becomes a state substantially equivalent to a lack of stock.
Therefore, the hydraulic cylinder for pitching control must be diverted so as to supply a sufficient amount of oil to operate at a predetermined operating speed.

On the other hand, in the rolling control, it is presumed that the higher the operating speed, the more precise the control is performed.However, when the rolling control is controlled based on the non-grounding type sensor, the operating speed becomes faster. Conversely, the lateral swing of the sensor is increased, and the hunting state is easily caused. Therefore, the operation speed is set to be slow, but there is a problem that accuracy is lowered by that amount.

[Means for solving the problem]

In order to solve the above problems, the present invention provides a hydraulic cylinder for pitching control for shunting hydraulic oil from a single hydraulic pump and vertically controlling a seedling planting work unit, and a right and left side of the seedling planting work unit. In a seedling plant having a hydraulic circuit configured to send a hydraulic cylinder for rolling control to perform tilt control, the rolling control is controlled based on a non-grounding type sensor, and an oil passage to the hydraulic cylinder for rolling control is provided. Into a plurality of branches, one of the branched oil passages is configured to communicate with a hydraulic cylinder for rolling control, and the other oil passage merges with the oil passage connected to the hydraulic cylinder for rolling control. A seedling transplanter is provided in an oil path that can be switched between a state in which the amount of hydraulic oil in a hydraulic cylinder is increased and a state in which the hydraulic oil does not merge with the oil path and returns to the tank.

[Action and Effect of the Invention]

Since the present invention is configured as described above, the hunting state is suppressed in the rolling control while the operating speed of the pitching control is sufficient, and the operating speed is appropriately increased to achieve high-precision control. Can be performed, and the conventional problem can be solved.

〔Example〕

2 and 3, the outline of the seedling planting machine will be described. The vehicle body 1 and the seedling planting machine body 2 are integrated into a walking type seedling planting machine provided with a steering handle 3 on the rear side. An engine 4 is mounted on the front side, and a pair of left and right wheel transmission cases 7 with wheels 5 mounted on the left and right sides are provided on the left and right sides so as to be vertically rotatable,
Each of the wheels 5 is transmitted from the engine 4 through a transmission device in the vehicle body 1.
For transmission drive.

The vehicle body 1 is provided with a hydraulic pump 8 driven by the engine 4 and configured to extend and retract a piston 10 of a pinching cylinder 9 in the front-rear direction through a pitching hydraulic circuit described later. Further, each arm 11 projecting upward from the left and right wheel transmission cases 7 and a slider 13 provided at the rear end of the piston 10 so as to be slidable back and forth against a spring 12 so as to swing back and forth. A rod 16 is connected between the right and left ends of the supported seesaw arm 15, and the pair of left and right wheels 5 can be operated in a vertical seesaw shape by the interlocking of the seesaw arm 15 swinging around the pivot 14. it can. Further, one of the left and right rods 16 is provided with a rolling cylinder 17 which is controlled to expand and contract by a rolling hydraulic circuit, and the relative vertical position of the left and right wheels 5 is changed by the expansion and contraction of the rolling cylinder 17. It has a rolling control configuration.

On the upper part of the vehicle body 1, there is provided a horizontal inclination sensor 18 composed of a pendulum for detecting the horizontal inclination angle of the vehicle body 1.

The seedling plant 2 at the rear of the vehicle body 1 has a seedling tank 19 inclined forward and downward.
Is linked to the seedling removal frame 20 so that it can move left and right,
In addition, each seedling outlet 21 of the seedling outlet frame 20 is moved down to move the seedling tank.
The seedling attachment 22 for separating and planting the seedlings with the floor supplied from 19 in a predetermined number is interlocked.

A center float 23 extending in the front-rear direction and side floats 24 on both the left and right sides are provided on the lower side of the vehicle body 1 and the body 2 so as to be vertically swingable about a float support shaft 25 on the rear side. This is to level the soil surface at the planting position to be planted by the planting tool 22.

In FIGS. 1 and 4, a pitching hydraulic circuit A communicating with the pitching cylinder 9 via a constant-volume flow dividing valve 26 for keeping the ratio of the partial flow from the hydraulic pump 8 constant, and a rolling hydraulic circuit B communicating with the rolling cylinder 17 are shown. And the hydraulic pressure is diverted to the sub-hydraulic circuit C communicating with the tank port T. The fixed flow diverting valve 26 divides the flow ratio to the pitching hydraulic circuit A by the throttle valve VA, divides the flow ratio to the rolling hydraulic circuit B by the throttle valve VB, and divides the flow ratio to the sub hydraulic circuit C by the throttle valve VC. Separation is set, for example, at a ratio of VA: VB: VC = 6.5: 2.0: 1.5.

The pitching hydraulic circuit A is provided with a pitching control valve 27, a relief valve 28, a throttle valve 29, and the like.
When the center float 23 moves upward from the neutral region under the soil pressure, the piston 10 of the pitching cylinder 9 is extended, and the seesaw arm 15 and the rod
The pitching control valve 27 is switched so that the right and left wheels 5 are moved down to raise the seedling plant body 2 via 16 and the like.
Further, when the center float 23 moves down from the neutral region, the switching control is performed so that the left and right wheels 5 are moved up and the seedling plant 2 is lowered. With such pitching control,
The contact pressure of each of the floats 23 and 24 is maintained substantially constant, and control is performed so that the seedling planting depth of the seedling planting tool 22 is constant.

The rolling hydraulic circuit B is provided with a rolling control valve 30, a relief valve 31, a backflow throttle valve 32, a pilot check valve 33, and the like. The rolling control valve 30 is connected to the front end of the pair of left and right side floats 24 by a wire 34 or the like. The left and right side floats interlock with the seesaw arm 34 that swings by connecting
When the vertical difference between the vehicle body 1 and the airframe 2 exceeds a predetermined value, the seesaw arm 35 is rotated, the rolling control valve 30 is switched, the rolling cylinder 17 is controlled to expand and contract, and the seesaw arm 15 is rotated. The vertical movement of the left and right wheels 5 causes the vehicle body 1 or the seedling plant 2 to follow the left and right inclination of the soil cultivator, so that the contact pressure of the left and right side floats 24 is substantially the same. Is controlled so as to maintain the ground in parallel to the left and right.

The spool shaft 36 of the rolling control valve 30 to which the seesaw arm 35 is interlocked is provided with a left-right inclination sensor 18 attached thereto. Is neutral, but if it is largely inclined leftward or rightward beyond the neutral region, the rolling control valve 30 can be switched and controlled irrespective of the interlock from the side float 24. The left-right inclination sensor 18 is provided with a rolling lock lever 37 that can fix the left-right swing of the pendulum to the machine body 2. When the spindle shaft 36 is fixed by the rolling lock lever 37, the rolling control valve 30 is not switched from the neutral region regardless of the swing of the side float 24.

Numeral 38 denotes a planting clutch lever for turning on and off the transmission of the seedling planting device. A lock pin 39 is formed between the seesaw arm 15 and the arm 40 protruding from the slider 13 in conjunction with the planting clutch lever 38. By inserting the seesaw arm 15 into the lock pin hole, the rocking of the seesaw arm 15 can be prevented.

The sub-hydraulic circuit C is provided with a switching control valve 41 for switching between the tank port T and the rolling hydraulic circuit B, and the switching control valve 41 is operated by a traveling lever for turning on and off a traveling clutch provided in the transmission of the wheels 5. The switching control valve 41 is switched to the rolling hydraulic circuit B side by turning on the traveling clutch in conjunction with the operation of 42, and is switched to the tank port T side by disengaging the traveling clutch.

When the hydraulic pump 8 is driven, the amount of oil is diverted to the pitching hydraulic circuit A, the rolling hydraulic circuit B, and the sub-hydraulic circuit C via the fixed flow dividing valve 26 at a ratio of VA: VB: VC. When the sensor float 23 is raised or lowered due to a change in unevenness or the like, the pitching control valve 27 of the pitching hydraulic circuit A is switched, and the pitching cylinder 9
The right and left wheels 5 are raised or lowered with respect to the vehicle body 1 to maintain and control the seedling plant 2 at a constant height above the soil surface.

Further, when the vehicle body 1 is tilted in the same direction due to, for example, the soil till being tilted left and right, the tilt is detected by the right and left tilt sensor 18 or the left and right side floats 24 and the rolling control valve 30 is switched to perform rolling. The rolling cylinder 17 of the hydraulic circuit B is controlled to expand and contract, so that the vehicle body 1 and the seedling transplanting body 2 and the like are maintained and controlled to be in the left and right horizontal posture.

When the traveling lever 42 is operated to travel with the traveling clutch engaged, the switching control valve 41 of the sub hydraulic circuit C is switched from the tank port T to the rolling hydraulic circuit B side, and the hydraulic flow rate of the rolling hydraulic circuit B is changed. Is increased from VB to VB + VC. Therefore, when the traveling lever 42 is turned on, when the rolling control by the rolling control valve 30 is performed, the rolling control is quickly performed by increasing the flow rate to the rolling cylinder 1.

When the traveling lever 42 is turned off and the traveling is stopped, for example, when replenishing the seedling tank 19 during seedling planting, the switching control valve 41 is switched to the tank port T, and the amount of oil in the rolling hydraulic circuit B is reduced. The rolling control is performed at a slow speed. This can prevent the hunting of the body 2 and the like from decreasing.

In FIG. 5, the difference from the above example is that the sub hydraulic circuit C
When the switching control valve 41 is greatly swung above a certain range of the pair of left and right side floats 24, the switching is controlled by the float sensor 43. When the vehicle body 1 or the seedling transplanting body 2 is largely tilted left and right, the left or right float sensor 43
The switching control valve 41 is switched from the tank port T to the rolling hydraulic circuit B in conjunction with an interlocking mechanism 44 such as a wire to perform rolling control promptly. The float sensors 43 rotate when the corresponding side floats 24 move upward beyond a certain position, and interlock the switching control valves 41. When the left and right side floats 24 return to their normal positions and the float sensor 43 moves down, the switching control valve
41 is switched to the tank port T.

In FIG. 6, the difference from the above embodiments is that the switching control valve 41 is connected to the pitching hydraulic circuit A side via a linkage 46 such as a rod by a float sensor 45 for detecting the upward movement of the center float 23 by a certain amount or more. When the vehicle body 1 suddenly goes into the depth, this is detected, and the switching control valve 41 is switched to the pitching hydraulic circuit A side, and the pitching control is performed. The seedling plant 2 is quickly raised.

7, a different point from the above embodiments is that a switching control valve 41 is provided so as to be switchable from a tank port T to a rolling hydraulic circuit B or a pitching hydraulic circuit A, and this switching control valve 41 is provided with a pair of left and right float sensors. When the vehicle body 1 or the like is largely inclined right and left in conjunction with the vehicle body 42, the oil amount of the rolling hydraulic circuit B is controlled to be increased, and in conjunction with the float center 45 of the center float 23, the vehicle body 1 and the like are controlled. Is greatly reduced, control is performed so as to increase the amount of oil in the pitching hydraulic circuit A.

In FIG. 8, the point different from the above embodiments is that the switching control valve 41 is configured to switch to the pitching hydraulic circuit A by operating the hydraulic lever 47 for operating the pitching control valve 27 upward to operate the upward movement. When the vehicle body 1 and the seedling transplanting body 2 are raised by the hydraulic lever 47, the amount of oil in the pitching hydraulic circuit A increases, and the pitching control is quickly performed.

In FIG. 9, the difference from the above embodiments is that
The switching control valve 41 is switched and interlocked by a front and rear inclination sensor 48 such as a pendulum for detecting the front and rear inclination of the vehicle. When the vehicle body 1 is largely inclined backward and downward, the front and rear inclination sensor 48 detects this and the switching control valve 41 From the tank port T to the pitching hydraulic circuit A. As a result, the descent speed when the vehicle body 1 is lowered from the rearwardly inclined posture is increased.

In this example, the rolling control is not performed by the side float 24, but is performed by the left and right tilt sensor 18.

[Brief description of the drawings]

1 shows an embodiment of the present invention. FIG. 1 is a hydraulic circuit diagram, FIG. 2 is a side view of a partially broken seedling planter, FIG. 3 is a partial plan view thereof, and FIG. Part of the hydraulic circuit diagram, 5th
FIG. 9 to FIG. 9 are hydraulic circuit diagrams showing another embodiment. (Explanation of reference numerals) 1 ... body, 2 ... seedling plant 5 ... wheels, 8 ... hydraulic pump 9 ... pitching cylinder 17 ... rolling cylinder 18 ... left and right inclination sensor, 23 ... center float 24 ... … Side float, 26 …… quantitative flow dividing valve 27 …… pitching control valve 29 …… throttle valve, 30 …… rolling control valve 41 …… switching control valve, 42 …… travel lever 43 …… float sensor, 45 …… float Sensor 47: Hydraulic lever, 48: Front-back tilt sensor A: Pitching hydraulic cylinder B: Rolling hydraulic cylinder C: Sub hydraulic cylinder VA: Throttle valve, VB: Throttle valve VC: Throttle valve, T ... … Tank port

Claims (1)

(57) [Claims] 1. Dividing pressure oil from a single hydraulic pump,
A seedling machine having a hydraulic circuit configured to send a hydraulic cylinder for pitching control for vertically controlling the seedling planting work unit and a hydraulic cylinder for rolling control for controlling the lateral inclination of the seedling planting work unit; Is controlled based on a non-grounding type sensor, an oil passage to the hydraulic cylinder for rolling control is branched into a plurality of oil passages, and one of the branched oil passages is a hydraulic oil for rolling control. Another oil path is connected to the cylinder, and the other oil path joins the oil path leading to the hydraulic cylinder for rolling control to increase the amount of hydraulic oil in the hydraulic cylinder, and returns to the tank without joining the oil path. A seedling transplanter provided in an oil passage that can be switched between states.