JPS6112163Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a ground sensor float in which a seedling planting device is connected to a traveling machine equipped with wheels that are raised and lowered by a hydraulic cylinder, and a control valve of the hydraulic cylinder is provided to be movable up and down. The wheels are configured to move up and down in a direction opposite to the float displacement direction based on the vertical displacement of the sensor float with respect to the machine body, so that the machine body can be kept at a predetermined position relative to the rice field regardless of changes in the depth of the plow. The control valve can be configured to be able to be forcibly switched to the wheel lowering side with an operating lever, so that when the aircraft direction is changed at the edge of a ridge, the wheels are This invention relates to an improvement in a wheel lifting device for a rice transplanter, which allows the machine body to be raised by descending and rotated with little resistance in a state where there is little mud pushing by the float.

Conventionally, in the above-mentioned wheel lifting device, when the wheel is forcibly lowered using the operating lever, the lower limit of the wheel lifting device is abutted with a stopper to prevent it from descending too far. In order to lift the machine body by lowering the wheels, it is necessary to adjust the position of the stopper according to the depth of the hard ground in the field, more precisely, the depth at the edge of the ridge.
The operation was troublesome.

In addition, if you want to lift the machine significantly when supplying seedlings from a high ridge, crossing a ridge, or loading onto a vehicle, release the stopper in advance and switch the wheels to a state where they can be lowered to the lowest limit. This made the operations associated with raising and lowering the wheels even more complicated.

The present invention eliminates the above-mentioned drawbacks, and allows lifting of the machine by fixed-distance wheel lowering without requiring any special adjustment operations, regardless of the plowing depth at the edge of the ridge. The purpose of this is to make it possible to lower the aircraft to its lowest limit and lift the aircraft by a simple operation.

A feature of the present invention for achieving the above object is that, in the wheel lifting device having the above configuration, the control valve switching control lever can be selectively operated to one of two operating positions for forced lowering of the wheels; At the operating position, the control valve is switched to the wheel lowering side, and when the wheel is lowered by a certain amount, a wheel quantitative lowering mechanism is activated which returns the control valve to the neutral position.At the other operating position, the wheel quantitative lowering mechanism is activated. The control valve is configured to switch to the wheel lowering side without activating the control valve.

According to the above configuration, when one stroke of planting travel with the automobile wheel elevation control is completed, the operation lever is switched to the wheel forced lowering operation position where the wheel quantitative lowering mechanism is activated. The machine, which had been maintained at a predetermined level relative to the rice field by automatic control until just before operation, will now be reliably lifted by a certain amount by lowering the wheels.
Regardless of the plowing depth at the edge of the ridge, it has become possible to perform stable and safe maneuvering of the aircraft while always lifting the aircraft just the right amount.

Furthermore, when the operating lever is switched to the operating position for forced lowering of the other wheel, the wheel can be freely lowered to the lowest limit.
There is no need to separately adjust or release special wheel lowering restrictions, and by simply selecting and operating the operating lever, it is possible to easily switch between quantitative and maximum lifting of the aircraft, greatly improving operability.

Further, as shown in the following embodiment, the control lever for switching the control valve is also used as the control lever for the planting clutch, and the control lever is linked to disengage the planting clutch when the control lever is switched to the wheel forced lowering side. If this is done, the operation for lifting and turning the machine from the end of one stroke of planting travel will be a single lever operation, which will be effective in improving work efficiency.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Figure 1 shows a side view of a riding rice transplanter, with a pair of left and right propulsion wheels 1, 1 that touch the hard ground at one point in the longitudinal direction of the machine, and a pair of propulsion wheels 1, 1 that touch the rice field in front of these wheels 1, 1. A plurality of grounding floats 5 are supported on the ground by a grounding float 2, and are grounded on the rice field at the rear of a passenger vehicle 4 equipped with a driver's seat 3. 6. A seedling planting device 8 is connected and equipped with a plurality of planting claws 7 that circulate up and down between the lower end of the seedling stand 6 and the mud. The system is configured to plant multiple rows of seedlings as the process progresses.

The seedling planting device 8 includes a planting transmission case 9.
It is configured so that it can be switched between an operating state and a stopped state by turning on and off a planting clutch 10 provided therein.

The wheels 1, 1 are supported by the free ends of transmission cases 13, 13 which are pivotally supported to be vertically swingable on a transmission case 12 directly connected to the engine 11, and are configured to be movable up and down. The device is configured to be raised and lowered by a wheel-driven lifting mechanism, and is automatically forcibly lowered by a set appropriate amount from the adjusted position by a wheel quantitative lowering mechanism built into the lifting device. It is structured as follows.

The wheel drive elevating mechanism and the wheel quantitative lowering mechanism will be explained based on FIGS. 2 and 3.
14 is a hydraulic cylinder for wheel elevation operation linked to the transmission cases 13, 13 via a link mechanism;
15 is a control valve for the hydraulic cylinder 14; 16 is pivotally supported by the traveling body 14 so as to be vertically swingable, and detects the height of the body relative to the mud surface as a vertically oscillating displacement; The control valve 1
5, a sensor float connected to a swinging link 18 which is pivotally supported by the push/pull spool 15a; 19, a rack plate that can freely engage with the engaging protrusion 20 fixed to the cylinder 14; and 21, the spool 15a and the rack plate. A connecting arm 22 that is swingable about a pivot point P connecting the rack plate 19 with the connecting arm 21 is engaged with the protrusion 20 by pressing and swinging the rack plate 19 around a pivot point Q with the connecting arm 21. A swing type pressure valve 23, which is switched to a non-coupling state, is an operating arm for manual operation fixed to the spool 15a.

Then, by not engaging the rack plate 19 with the protrusion 20 and maintaining the operating arm 23 in a free state, the sensor float 16
In order to stabilize the planting depth by pushing and pulling the spool 15a to the raised position UP, neutral position N, and lowered position DOWN, the height of the machine relative to the rice field is maintained at the set height. , 1 are configured to automatically raise and lower the elevators.
Also, by operating the spool 15a to the lowering position DOWN with the operation arm 23 without engaging the rack plate 19 with the protrusion 20, the wheels 1, 1 are forcibly adjusted downward to the stroke end. It is configured. Further, the operation arm 2
3, by operating the spool 15a to the lowering position DOWN and at the same time operating the rack plate 19 to engage the protrusion 20, the wheel quantitative lowering mechanism is activated, and the spool moves in conjunction with the lowering of the wheels 1a and 1b. It is configured to create a state in which the wheels 1, 1 are automatically forcibly lowered by a predetermined amount from the position where the wheels 1, 1 have been raised and lowered while performing the operation of returning the wheel 15a to the neutral position N.

The planting clutch 10, the wheel drive lifting mechanism, and the wheel constant lowering mechanism are linked to one swing operation lever 30. That is, lever 3
0 and the planting clutch operating arm 10a are linked via a C-shaped link 24 and a wire 25, and
The lever 30 and the spool operating arm 23 are
a C-shaped link 26, a wire 27, and a flexibility spring 28 for providing linkage flexibility between the lever 30 and the spool operating arm 23 during said quantitative lowering.
and the swinging pressing piece 22
is connected to the wire 27 with a flexible elongated hole 29 to prevent it from swinging when it is forcibly lowered to the stroke end.

Then, move the lever 30 to position A for planting work.
When the lever 30 is moved to the wheel forced lowering operation position _B1 , the wheels 1 and 1 are forcibly lowered to the stroke end. state and brings about the planting stop state, and lever 3
0 to the operation position _B2 for fixed-quantity wheel lowering, the wheel fixed-quantity lowering mechanism is switched to the operating state, and the planting is stopped. The wheel forced lowering operation position _B1 is mainly used when driving on the road, and
The operation position B ₂ for fixed-quantity lowering of the wheels is used to place the traveling body 4 in a forward-inclined position with its rear part raised in order to slightly lift the seedling planting device 8 from the field surface, mainly when planting at the edge of a ridge in a field. It is used. Further, the lever 30 is biased forward when located in front of the switching dead center X, and biased backward when it is located behind the dead center X by the action of the C-shaped links 24 and 26. At the same time, the guide frame 31 is held in contact with the guide frame 31 at each of the positions A, B ₁ and B ₂ .

In this case, a seedling planting device 8 is installed at the front of a traveling body 4 in which a grounding float 2 is provided behind the propulsion wheels 1.
A configuration in which these are connected can also be implemented in the same manner as in the above embodiment.

[Brief explanation of the drawing]

The drawings show an embodiment of the wheel lifting device for a rice transplanter according to the present invention, FIG. 1 is an overall side view, FIG. 2 is a schematic diagram showing the wheel lifting device, and FIG. 3 is a plan view of the lever guide section. . DESCRIPTION OF SYMBOLS 1... Wheel, 2... Ground float, 4... Traveling body, 8... Seedling planting device, 10... Planting clutch, 14... Hydraulic cylinder, 15... Control valve, 1
6...Sensor float, 30...Operation lever,
B ₁ ... Operating position for forced wheel lowering, B ₂ ... Operating position for fixed wheel lowering.

Claims (1)

[Claims for Utility Model Registration] Wheels 1 that are raised and lowered by hydraulic cylinders 14
A seedling planting device 8 is connected to a traveling body 4 equipped with a
The control valve 15 of the hydraulic cylinder 14 is connected to a ground sensor float 16 that is movable up and down, and the sensor float 16 is connected to the airframe 4.
The wheel elevation of a rice transplanter is configured to control the elevation of the wheel 1 in a direction opposite to the float displacement direction based on the vertical displacement of the rice transplanter, and the control valve 15 is configured to be forcibly switched to the wheel lowering side by an operating lever 30. In the device, the operating lever 30 can be selectively operated into operating positions B ₁ and B ₂ for forcibly lowering the two wheels, and in one operating position B ₂ , the control valve 1 is
5 to the wheel lowering side, and when the wheel 1 lowers by a certain amount, a wheel quantitative lowering mechanism is activated which automatically returns the control valve 15 to neutral, and at the other operation position _B1 , the wheel quantitative lowering mechanism is activated. A wheel lifting device for a rice transplanter configured to switch the control valve 15 to the wheel lowering side without starting the mechanism. The operating lever 30 is structured to double as an operating lever for the planting clutch 10, and the planting clutch 10 is disengaged by switching the lever 30 to the wheel forced lowering side. The wheel lifting device described in .