JPH0160209B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a machine in which an oscillating ground float, which is biased toward the ground side by a coil spring, is installed in an operating unit for raising and lowering a wheel by an aircraft-to-aircraft drive so that the ground attitude is maintained almost constant. a check member that mechanically interlocks the human operating tool and acts on the coil spring so that the coil spring is switched to a non-acting state or a substantially non-acting state with respect to the float; , relates to a walking rice transplanter in which the human operating tool is mechanically linked.

By switching the coil springs to a non-active state, the above walking rice transplanter makes the automatic lifting control of the wheels relative to the machine body sensitive based on the detection of the rocking of the ground floats, and maintains the machine body in a slightly upward position. This allows the aircraft to turn easily while reducing sliding resistance on muddy surfaces. Conventionally, two wires, rods, etc. were used to link the human operating tool with the wheel lift/lower operating section and the check member. The wheel lifting/lowering operating section and the restraining member were each linked and connected to the human operating tool. However, since there are two interlocking systems from the human operating tool, the structure is complicated.

In view of the above-mentioned conventional situation, an object of the present invention is to simplify the interlocking structure from the human operating tool through simple and rational improvements, further ensure the function of the coil spring, and improve the operating structure. The point is that it can be made compact.

A characteristic feature of the present invention is that in the walking rice transplanter described above, an interlocking member between the human operating tool and the operating section is inserted into the coil spring, and the restraining member is attached to the interlocking member.

In other words, by simply attaching a restraining member to the interlocking member between the human operating tool and the operating section, the interlocking structure from the human operating tool can be integrated into one system while the interlocking member is used for both purposes. It has now become possible to greatly simplify the operating structure for the parts and check members.

Moreover, since the interlocking member is inserted into the coil spring, the interlocking member can be further utilized to maintain the shape of the coil spring when it expands and contracts, thereby maintaining the urging function of the coil spring well. Furthermore, compared to installing coil springs in other locations, the dedicated space of the coil springs can be saved, which is superior in terms of manufacturing and assembly as well as economical aspects, and is also easier to operate. It has now been possible to provide a walk-behind rice transplanter that has a compact structure and has excellent automatic lifting and lowering control performance of its wheels.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

As shown in FIG. 1, a pair of left and right propulsion wheels 1,
The fuselage frame 3 is equipped with a ground leveling float 2 that supports the fuselage on the ground in cooperation with the fuselage frame 3, and is provided with a front driving unit 4 and a pair of left and right rearwardly extending control handles 5, which are capable of horizontal reciprocating with a constant stroke. A plurality of seedlings are taken out one by one from the lower end row of each of the plurality of pine-shaped seedlings W placed side by side on the seedling platform 6 and planted on the mud surface. A seedling planting device 8 equipped with various devices such as a seedling planting claw 7 is attached to the rear of the machine frame 3, thereby forming a walking rice transplanter that sequentially plants multiple rows of seedlings as the machine moves. It has been done.

The pair of left and right propulsion wheels 1 connect the pair of left and right wheel transmission cases 9 to which they are attached to the hydraulic cylinder 1.
0 allows the aircraft to be driven up and down by swinging around the transverse axis P of the aircraft in pairs, allowing the aircraft to be moved up and down, and is configured to change the height of the aircraft from the ground depending on the driving situation. .

In addition, the wheel transmission case is configured to be able to freely swing left and right around the coaxial core P in addition to being able to drive and oscillate in a pair of left and right directions, so that during planting work,
Even when the relative height of both wheels 1 changes due to unevenness of the tiller, the machine body and the planting device 8 are maintained in a substantially horizontal posture by the counter-swinging motion.

The structure for lifting and lowering the axle 1 relative to the aircraft will be described in detail below.

As shown in FIG. 2A, one sensor float 11 is installed at the center of the front end of the aircraft
are connected to each other so as to be able to freely swing around the transverse axis Q on the front end side thereof, and the swinging ends of an L-shaped swinging member 13 and the rear end of the sensor float 11 are interlocked and connected to the valve 12 for operating the hydraulic cylinder 10. part and rod 1
4, they are interlocked and connected. Then, the swinging end of the L-shaped swinging member 13 and the sensor float 11 are urged downward through the swinging contact member 15 that comes into contact with the upper side of the swinging end of the L-shaped swinging member 13. A coil spring 16 is provided, and planting travel is performed with a predetermined ground load applied to the sensor float 12 by the coil spring 16, and based on the detection of the swing of the sensor float 11 due to fluctuations in the depth of the tillage. In other words, when the depth of the plow becomes deep and the sensor float 11 swings upward against the spring 16, the valve 12 is automatically operated.
The wheels 1 are automatically lowered relative to the machine, and when the plowing depth becomes shallow and the sensor float 11 swings downward, the wheels 1 are automatically raised relative to the machine and the planting device 8 is brought to an appropriate working height above the ground. The aircraft is configured to automatically ascend and descend in order to maintain this level.

In addition, the elongated hole accommodating portion 14a provided at the connecting portion of the rod 14 to the L-shaped swinging member 13 allows automatic operation of the valve 12 based on the swinging detection of the sensor float 11 when the planting device 8 is at the appropriate working height above the ground. This is to provide a dead zone in the airframe, and is designed to prevent hunting during automatic aircraft elevation control.

The valve 12 is operated manually by operating a control lever 17 provided on the control handle 5, giving priority to automatic operation based on the detection of the rocking of the sensor float 11. The operation structure will be explained in detail in Figure 2 A, B, C, and D.

A locking pin 19 connects an arm 18 connected to the L-shaped swinging member 13 so as to be able to freely swing integrally thereto, and an end on the spring 16 acting side of the swinging abutment member 15 to the swinging abutment member 15 side. is engaged with an elongated hole 18a formed in the arm 18 for interlocking connection, and the operating lever 17 and the swinging contact member 15 are interlocked via a wire 20 arranged to be inserted into the coil spring 16. They are connected and configured so that the following four operating states (a), (b), (c), and (d) can be achieved by operating the operating lever 17.

(A) By operating the operating lever 17 to the automatic control position (A), the wire 2
0 is loosened to allow the downward biasing of the sensor float 11 by the spring 16, and to position the locking pin 19 approximately in the middle of the elongated hole 18a when the valve 12 is in the neutral state, thereby increasing the flexibility of the elongated hole 18a. By allowing the arm 18 to swing with
The above-mentioned machine automatic elevation control state allows vertical swinging of the mold swinging member 13 and automatically operates the valve 12.

(B) By operating the operating lever 17 to the pivot position N' and locking and holding it in the lever locking groove 21a formed at that position, the swinging abutment member 15 is moved to the spring 16 as shown in FIG. 2B. The sensor float 11 is held at a swinging position separated from the L-shaped swinging member 13 in the neutral state against the biasing force of At the same time, when the valve 12 is in the neutral state, the locking pin 1
9 is located at a position slightly offset from the middle part of the elongated hole 18a to maintain the vertical swinging state of the L-shaped swinging member 13 due to the accommodation effect of the elongated hole 18a, and as a result, the sensor float 11 The automatic operation of the valve 12 to the wheel-to-body downward side based on the upward swing detection of the machine body is maintained in a slightly upward position, and the sliding resistance of the soil leveling float 2 to the mud surface is reduced. This is a condition that allows the aircraft to turn smoothly.

(c) By operating the operating lever 17 to the fixed position N and locking and holding it in the lever locking groove 21b at that position, the swinging abutting member 15 can be moved against the spring 16 as shown in FIG. 2c. L in neutral state
While separating it largely from the mold swinging member 13,
When the valve 12 is in a neutral state, the locking pin 19 is held in a position where it contacts the end of the elongated hole 18a, and the locking action between the elongated hole 18a and the locking pin 19 causes the L-shaped swinging member 13 to A state in which the downward swinging from the neutral position is prevented, the operation of the valve 12 toward the wheel-to-airframe upward movement is checked, and the upward posture of the aircraft is maintained when traveling on the road.

(d) As the operating lever 17 is operated to the raised position U against the biasing force of the spring 16,
As shown in FIG. 2D, the elongated hole 18 of the locking pin 19
A state in which the L-shaped swinging member 13 is forcibly swung upward with a locking action on the a end, and the valve 12 is operated to the wheel-to-airframe downward side to forcibly raise the airframe when driving on the road.

Note that the operating lever 17 is also linked to a planting clutch (not shown) that operates intermittently to transmit power from the machine to the planting device 8.
7 to the automatic control position A, and the planting clutch is automatically engaged and operated by operating the operating lever 17 to other operating positions N', N, and U. It is configured so that the manual lifting/lowering operation of the machine body and the driving operation of the planting device 8 can be performed at the same time with a single operating lever 17 depending on the running condition.

Reference numeral 27 in the figure is a coil spring attached to a wire 26 that interlocks and connects the main clutch lever 22 and the operating member 24a of the main clutch 24. As shown in FIG.
and the locking action between the locking pin 19 and the elongated hole 18a when the lifting operation lever 17 is moved to the fixed position N, which is performed prior to the main clutch lever 22 being disconnected. Due to these two actions, when operating the main clutch lever 22,
Automatically checks the automatic lifting and lowering operation of the valve 12, and for example, the sensor float 11 senses when replenishing seedlings and reliably prevents the machine from unexpectedly lifting and lowering automatically, and also adjusts the height of seedling replenishment. If it is necessary to raise the aircraft with the main clutch 24 disengaged, the coil spring 27
The structure is such that the aircraft body can be forcibly raised by operating the lifting operation lever 17 against the biasing force of.

In short, the swing abutment member 15, which acts to switch the biasing action of the ground load setting coil spring 16 against the sensor float 11 between the operative state and the non-operative state in accordance with the operation of the operating lever 17, By directly attaching the operating lever 17 and the valve 12 to the wire 20 that interlocks and communicates with each other, the interlocking structure from the operating lever 17 to the valve 12 and the swinging contact member 15 can be reduced to 1 when the wire 20 is used for both purposes. It is structured to simplify the interlocking structure.

In addition, by inserting the wire 20 into the ground load setting coil spring 16, the wire 20 ensures that the coil spring 16 retains its shape during expansion and contraction, and the biasing function of the coil spring 16 is always maintained properly. At the same time, the dedicated space for the coil spring 16 is omitted, and together with the simplification of the above-mentioned interlocking structure, the operation structure is further made compact.

Note that the member that acts to switch the biasing action of the spring 16 against the sensor float 11 between an active state and a non-active state in accordance with the operation of the operating lever 17 can be replaced with the swing abutting member 15 and may have various shapes and various shapes. It is possible to use members of the actuating structure, and these members are collectively referred to as the check member 15.

Furthermore, the interlocking member 20 that interlocks the operating lever 17 and the valve 12 can be modified in various ways, such as using a rod or link instead of a wire, and the specific attachment of the restraining member 15 to the interlocking member 20 is possible. The structure can also be changed in various ways.

The present invention is directed to various types of walk-behind rice transplanters that are equipped with a mechanism for automatically raising and lowering wheels relative to a machine body based on detection of rocking of a sensor float.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the walking rice transplanter according to the present invention, and FIG. 1 is an overall side view, and FIG. 2 is a, b, c, and c.
D is a diagram showing the operating state of the wheel-to-body lifting operation structure. 1...wheel, 11...ground float, 12...
Operation unit, 15... check member, 16... coil spring, 17... human operating tool, 20... interlocking member.

Claims (1)

[Claims] 1 Operation unit 12 that raises and lowers the wheel 1 by driving against the aircraft
The oscillating grounding float 11, which is biased toward the grounding side by the coil spring 16, is mechanically interlocked so that its posture on the ground is maintained substantially constant, and the human operating tool 17 is mechanically interlocked, and the above-mentioned A walking type device in which the human operating tool 17 is mechanically linked to a restraining member 15 that acts on the coil spring 16 so that the coil spring 16 is switched to a non-acting state or a substantially non-acting state with respect to the float 11. A walking type rice transplanter, characterized in that an interlocking member 20 between the human operating tool 17 and the operating section 12 is inserted into the coil spring 16, and the restraining member 15 is attached to the interlocking member 20. Rice transplanter.