JPH033132Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention provides
The present invention relates to a hydraulic system for a posture control device that controls the posture of a drive system and a planting device to always maintain a constant posture regardless of the unevenness of a paddy tiller.

(b) Conventional technology Conventionally, in walk-behind rice transplanters, the left and right lug wheels are separately movable up and down, and one lug wheel is placed vertically in order to plant rows close to the ridge. There was a ridge release device that could do this.

However, there is no rolling control device that senses the unevenness of the plowing platform to keep the machine horizontal on both sides, and a pitching control device that senses the longitudinal sway of the machine and controls the engine and drive device up and down relative to the float. It wasn't.

(c) Problems that the invention aims to solve The purpose of the invention is to gather in one place hydraulic-related parts that perform two systems of posture control, pitching control and rolling control, of a walk-behind rice transplanter, and to connect them to hydraulic oil. A hydraulic unit is constructed around the tank, and the signals from the pitching sensor and rolling sensor are concentrated in this hydraulic unit, and the pressure oil from one hydraulic pump is divided into two directions by a constant ratio flow divider valve, which is then used for pitching control. Switching control is performed using a valve and a rolling control valve, and piping is connected to the pitching control hydraulic cylinder and the rolling control hydraulic cylinder over the shortest distance.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

In a walk-behind rice transplanter, the hydraulic oil tank, hydraulic pump, pitching control valve, and rolling control valve are integrated into a hydraulic unit, and the pitching control valve and rolling control valve are connected to the pitching sensor and rolling sensor for switching. This is what I did.

The pitching control circuit is also provided with an overload relief valve and a slow return check valve.

Additionally, a constant ratio flow dividing valve and a relief valve are provided inside the hydraulic pump case.

(e) Embodiments and operations The purpose and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings and the operation of the invention will be explained.

Figure 1 is a plan view of the walking rice transplanter of the present invention, Figure 2
The figure is a side view, FIG. 3 is a perspective view showing the structure of the pitching control hydraulic cylinder and rolling control hydraulic cylinder, and FIG. 4 is a perspective view of the rolling sensor and hydraulic unit.

The overall configuration will be explained from FIGS. 1 and 4.

Reference numeral 11 denotes a float, and a drive system is configured on the float 11 so that its front end can move up and down freely.A hydraulic unit V is placed at the front end, followed by an engine 14, and then a mission case 15. Swing cases 5L, 5R and rear end lug wheels 16L, 16R are arranged on the sides. Planting drive case 15 from the center of the transmission case 15
The power transmission device is placed facing a. A seedling stand 13 is provided above the planting drive case 15a, and a handle 17 is provided rearward.

These drive systems are pivotally supported by a pivot 11a at the rear of the float 11, and supported vertically freely by a pandagraph-shaped pitching sensor 12 at the front end. Therefore, when the float 11 swings back and forth significantly, the pitching sensor 12 moves up and down, transmits this to the pitching control valve 28 of the hydraulic unit V to control the pressure oil, and causes the pitching control hydraulic cylinder 1 to expand and contract. That's what I do. By the expansion and contraction of the hydraulic cylinder 1, the rotating tube 4 shown in FIG. 3 is moved back and forth, and the lug wheels 16L,
16R is moved up and down in the same direction to keep the drive system and the planting equipment attached before and after the pitching system at a constant inclination with respect to the pitching.

On the other hand, rolling is the horizontal shaking of the walking rice transplanter, and is detected by the floats for the left and right rolling sensors 9L and 9R.

As shown in FIG. 4, the vertical movement of the rolling sensors 9L and 9R is caused by the arm 8 protruding from the shaft 8 in FIG.
a, 8b. The shaft 8 is loosely fitted into a rotating tube 7 that rotates left and right and up and down about a pivot 7a.

A connecting rod 10 for sliding the rolling control valve 35 via an arm 7b is provided at a position away from the pivot portion 7a of the rotating cylinder 7.

With this configuration, when only one of the left and right of the rolling sensor floats 9L and 9R moves up and down due to unevenness of the tiller, the shaft 8 and the rotating cylinder 7 move left and right up and down around the pivot 7a. , the rolling control valve 35 is switched. On the other hand, in the case of pitching in which the left and right rolling sensors 9L and 9R move up and down at the same time, the left and right rolling float sensors 9L and 9R move up and down at the same time, so the shaft 8 rotates back and forth within the rotating tube 7. As a result, the rotating cylinder does not move and the rolling control valve 35 is not switched.

The pressure oil generated by this switching of the rolling control valve 35 is transferred to the rolling control hydraulic cylinder 2 shown in FIG.
As the rolling control hydraulic cylinder 2 expands and contracts, the arm 3a of the rotating shaft 3 rotates, and the swing case 5L is moved up and down by another arm 3b via the link 6L.

An arm 3c at the right end of the rotation shaft 3 protrudes in a direction opposite to that of the arm 3b, and is configured to move the swing case 5R up and down via a link 6R.
Because the arms 3b and 3c on the rotation shaft 3 are facing in opposite directions, the left and right lug wheels always move upside down, and the lug wheels move up and down against the unevenness of the field to move the left and right sides of the machine. This corrects the tilt and keeps it level.

4a is a bracket for the rolling control hydraulic cylinder 2. Further, the left and right lug wheels are also moved up and down by the expansion and contraction of the pitching control hydraulic cylinder 1, but in this case, the left and right lug wheels are moved up and down in the same direction, resulting in pitching control.

5 is a rear sectional view of the hydraulic unit V of the present invention, FIG. 6 is a side sectional view of the pump case portion, FIG. 7 is a plan sectional view, and FIG. 8 is a side sectional view of the rolling valve case 22. FIG. 9 is a plan sectional view of the pump case portion, FIG. 10 is a side sectional view of the pitching valve case, and FIG. 11 is a hydraulic circuit diagram of the hydraulic system of the present invention.

The hydraulic unit V includes an operating unit tank 20,
Pump case 23, rolling valve case 2
2. Consists of pitching valve case 21,
Pump case 23 is rolling valve case 22
The rolling valve case 22 itself is fixed to the inner surface of the hydraulic oil tank 20 and inserted into the hydraulic oil tank 20, and the rolling valve case 22 itself also serves as a lid on the left side of the hydraulic oil tank 20. The pitting valve case 21 is fixed to the right side wall of the hydraulic oil tank 20.

The hydraulic unit V itself projects forward from the engine frame and is placed on top of it, as shown in Figure 1.
The rotation of the engine 14 is input to the input pulley 24a. The input shaft 24 is a pump shaft, and gears 25 and 26 constitute a hydraulic pump. As shown in FIG. 6, a constant ratio flow dividing valve 29 is connected to the biasing springs 31 and 32 above the discharge port side of the hydraulic pump.
The pressure oil from one hydraulic pump is branched at a constant ratio into a pitting system and a rolling system. 33 and 34 are relief valves for the pitching system and rolling system.

In this way, since the hydraulic pump, the two-way constant ratio flow dividing valve, and two sets of relief valves are integrated into the pump 23, the mating surface between the pump case 23 and the rolling valve case 22 The drain oil passages 23g and 23f are formed by casting, and the drain oil discharged from the relief valves 34 and 33 is circulated into the hydraulic oil tank 20. Reference numeral 27 denotes an oil filter, which is sandwiched and fixed between the right inner wall of the hydraulic oil tank and the right outer end of the pump case 23.

Further, the pressure oil diverted to the pitting circuit by the constant ratio diverter valve 29 immediately enters the curved path 22a of the rolling valve case 22 from the oil path of the pump case 23, and then flows into the oil path 20b of the hydraulic oil tank 20. and is sent into the pitting valve case 21 on the right side of the hydraulic oil tank 20.

As shown in FIG. 5, a shielding wall 20a is provided above the hydraulic oil tank 20 to prevent splashing of the hydraulic oil, and a breather 40 is provided above this.

The rolling valve case 22 includes a rolling control valve 35 and a flow divider valve 39.
As shown in the hydraulic circuit diagram of FIG. 11, the pressure oil in the oil chamber on the piston rod side, which is the contraction direction of the rolling control hydraulic cylinder, is guided as pilot pressure to the back chamber of the flow divider spool. The throttle amount is configured to change depending on the amount of spool displacement of the rolling control valve 35. As a result, the speed at which the rice transplanter is leveled changes depending on the degree of horizontal inclination of the rice transplanter.

Furthermore, an overload relief valve 38 and a slow return check valve 42 are provided on the pitting control valve 28 side, which prevents damage to the hydraulic equipment when a vertical shock is applied to the walk-behind rice transplanter. Also, during control, the speed in the downward direction is due to gravity to prevent the aircraft from descending rapidly.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, since the hydraulic equipment for pitching control and rolling control was integrated into a hydraulic unit, the number of piping could be kept to a minimum and it could be placed close to the pitching sensor and rolling sensor. It is.

Second, since the constant ratio flow divider valve and relief valve are placed inside the pump case, the flow path from the pump discharge side to the constant ratio flow divider valve can be made as short as possible, and the relief valve in the circuit after flow division can also be balanced. It can be placed well.

Since an overload relief valve and a slow return check valve are installed in the third pitching circuit, the vertical movement for pitching control can be made at approximately the same speed, and the rice transplanter can be unloaded from the truck bed after being transported. Even if the rice transplanter is dropped from above, the overload relief valve allows the pressure oil to escape without damaging the hydraulic equipment or the rice transplanter itself.

[Brief explanation of the drawing]

Figure 1 is a plan view of the walking rice transplanter of the present invention, Figure 2
The same figure is a side view, Figure 3 is a perspective view showing the configuration of the pitching control hydraulic cylinder and rolling control hydraulic cylinder part, Figure 4 is a perspective view of the rolling sensor part and the hydraulic unit part, and Figure 5 is the hydraulic pressure of the present invention. 6 is a side sectional view of the pump case portion, FIG. 7 is a plan sectional view, FIG. 8 is a side sectional view of the rolling valve case 22, and FIG. 9 is a side sectional view of the pump case portion. FIG. 10 is a side sectional view of the pitching valve case, and FIG. 11 is a hydraulic circuit diagram of the hydraulic system of the present invention. V...Hydraulic unit, 9L, 9R...Rolling sensor, 12...Pitching control sensor,
20...Hydraulic oil tank, 21...Pitching valve case, 22...Rolling valve case, 2
3... Pump case, 29, 30... Constant ratio dividing valve, 38... Overload relief valve, 4
2...Slow return check valve.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a walk-behind rice transplanter, a hydraulic oil tank, a hydraulic pump, a pitching control valve, and a rolling control valve are integrated into a hydraulic unit, and the pitting control valve and rolling control valve are A posture control device for a walking rice transplanter characterized by being connected to a pitching sensor and a rolling sensor to perform switching. (2) An attitude control device for a walk-behind rice transplanter, characterized in that the pitching control circuit according to claim 1 of the registered utility model is provided with an overload relief valve and a slow return check valve. (3) Utility Model Registration A posture control device for a walk-behind rice transplanter, characterized in that the hydraulic unit according to claim 1 is provided with a constant ratio flow divider valve and a relief valve in the hydraulic pump case.