JPH0516892Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is based on a machine body equipped with paddy field working equipment such as a seedling planting device or a direct sowing device, and a driving lifting mechanism that drives the driving wheels up and down. This invention relates to a walking type paddy field working machine that is equipped with a wheel quantitative lowering mechanism that lowers the machine by a certain amount, and a pair of left and right line markers that can move in and out in the lateral direction with respect to the moving direction of the machine.

[Conventional technology]

As this type of walking-type paddy field work machine, one is known in which the left and right delineation markers can be switched between an operating position and a retracted position by manual operation.

[Problems to be solved by the invention] However, in the case of this conventional walk-behind paddy field work machine, when turning the machine at the edge of a ridge, etc., it is necessary to perform a fixed lowering operation of the wheels by the wheel fixed lowering mechanism, turning on the planting clutch, In addition to the OFF operation and the turning operation of the control handle, the long line marker in the operating position must be switched to the retracted position one by one, which requires a lot of effort and effort. Therefore, there is a problem that the entire turning operation becomes complicated.

An object of the present invention is to make it possible to reliably and easily switch the delineation marker to the retracted position by effectively utilizing the fixed wheel lowering mechanism that is always activated when the aircraft turns.

[Means for solving problems]

The walking type paddy field work machine according to the present invention is characterized in that it is provided with a posture switching mechanism that switches the line drawing marker from an operating posture to a retracted posture in conjunction with the operation of the wheel quantitative lowering mechanism. , the effects and effects thereof are as follows.

[Effect]

In other words, we focused on the fact that, at the start of a turn, there is a fixed wheel lowering mechanism that lowers the propulsion wheels from a height position relative to the aircraft suitable for working in rice fields to a minimum height position relative to the aircraft suitable for turning. By effectively utilizing the operation of this wheel quantitative lowering mechanism to switch the drawing marker in the operating position to the retracted position, the effort required to switch the drawing marker to the retracted position is completely eliminated. It can be omitted.

[Effect of idea]

Therefore, by using the operation of the fixed wheel lowering mechanism that is always activated when the aircraft turns, it is possible to automatically switch the delineation marker to the retracted position, which simplifies the turning operation at the edge of a ridge, etc. We were able to achieve this goal.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

Figure 3 shows a walking rice transplanter, which is an example of a walking rice paddy work machine, which consists of an engine 1, a transmission case 2, a frame 3 that also serves as a transmission case extending rearward from the transmission case 2, and a transmission case 3 that extends rearward from the transmission case 2. The machine A is composed of a four-row seedling planting device (an example of a paddy field working device) 4 connected to the rear of the frame 3 and a control handle 5.
On the left and right sides of the transmission case 2, there are transmission cases 7, 7 that respectively support the left and right propulsion wheels 6.
is mounted so as to be able to swing up and down about the horizontal axis X on the front end side, and a sensor center is installed in the center between the left and right propulsion wheels 6, 6 and on the lateral outer side of the propulsion wheels 6, 6. Float 8A and side float 8
B and 8B are arranged.

Further, means for simultaneously driving the left and right propulsion wheels 6, 6 up and down in the same direction, and the left and right propulsion wheels 6,
A drive elevating mechanism B is provided, which includes means for driving and lowering 6 in a reverse manner.

As shown in FIGS. 1 and 2, this drive elevating mechanism B is for driving and lowering left and right propulsion wheels 6, 6 on a bracket 9 provided at the upper part of the mission case 2 within the planting work range. A lifting hydraulic cylinder 10 is connected to the piston rod 10a of the lifting hydraulic cylinder 10, and a lifting arm 13 is attached to the piston rod 10a of the lifting hydraulic cylinder 10, which moves integrally via a suspension spring 12. A balance arm 14 that can swing freely around the vertical axis Y is pivotally mounted.

Further, both ends of this balance arm 14 and brackets 15, 15 fixed to the swinging fulcrum cylinder portions 7a, 7a of the transmission cases 7, 7 are connected by rods 16, 16.
A rolling hydraulic cylinder 17 is installed across the lift arm 13 and the balance arm 14 to drive and swing the balance arm 14 around the vertical axis Y.

Then, when the lifting hydraulic cylinder 10 is operated, the lifting operating arm 13 and the balance arm 14 are activated.
moves integrally in the front and back direction, and the rods 16, 16
The left and right propulsion wheels 6, 6 are simultaneously driven up and down in the same direction via the transmission cases 7, 7. Also,
When the rolling hydraulic cylinder 17 is operated, the balance arm 14 is swung around the vertical axis Y with respect to the lifting arm 13, and the left and right propulsion wheels 6 are moved through the rods 16, 16 and the transmission cases 7, 7. ，
6 is driven up and down in a contradictory manner.

The spool of the control valve 18 interposed in the hydraulic circuit of the lifting hydraulic cylinder 10 and the front bracket 8a of the center float 8A are interlocked and connected via a swing link 35 and a rod 36. When the ground pressure of the float 8A is within the set ground pressure range, in other words, when the height of the front part of the center float 8A with respect to the aircraft body is within the set height range, the control valve 18 is maintained at the vertical neutral position; When the front part of the center float 8A rises beyond the set height range, the control valve 18 is switched to the wheel lowering position and the front part of the center float 8A rises beyond the set height range. When descending, control valve 18
It is configured to switch and operate the wheel to the wheel raised position.

Between the lifting hydraulic cylinder 10 and the bracket 9, there is a quantitative lifting hydraulic cylinder 11 for driving and lowering the left and right propulsion wheels 6, 6 simultaneously by a certain amount in the same direction via the lifting hydraulic cylinder 10. and a control valve 1 interposed in the hydraulic circuit of the fixed-quantity lifting hydraulic cylinder 11.
The spool 9 and the operating lever 21 of the planting clutch 20 are interlocked and connected by a link mechanism 22, and then the operating lever 21 is moved to the clutch cut position (OFF).
When operated, the spool of the control valve 19 is switched to the wheel lowering position, thereby forming a wheel quantitative lowering mechanism C that lowers the propulsion wheels 6, 6 by a certain amount. In this wheel quantitative lowering mechanism C,
When the operating lever 21 is operated to the clutch engaged position (ON), the spool of the control valve 19 is switched to the wheel raising position, and the propulsion wheels 6, 6 are raised by a certain amount.

At both ends of the frame 24 of the seedling planting device 4, which is located at the back of the lower end of the seedling stand 23, line markers 25 for marking the next planting travel indicator line in the field are placed horizontally outward on the side of the machine. It is attached so as to be able to swing freely around the longitudinal axis Z between an operating position in which it protrudes and a retracted position in which it is vertically retracted toward the fuselage. Also, this left and right line marker 2
Spring 2 that urges 5 and 25 to protrude into the working position
6, 26, and a pin 2 fixed to the swinging base end of the line drawing markers 25, 25 when the line drawing markers 25, 25 are switched to the retracted position.
7, 27, the line drawing markers 25, 25
Lock arms 28, 28 are provided for holding the storage position in the retracted position against the biasing force of springs 26, 26.

The left and right lock arms 28, 28 and the actuating arm 30, which is pressed and swung as the operating lever 21 in the clutch release position (OFF) oscillates from side to side, are linked by release wires 29, 29 to perform this operation. The left and right lock arms 28,
28 can be selectively unlocked, and a posture switching mechanism D that switches the line drawing markers 25, 25 from an operating posture to a retracted posture in conjunction with the lowering operation of the wheel quantitative lowering mechanism C.
is provided.

This attitude switching mechanism D includes a line marker 25,
25 and the bracket 31 fixed to the cylinder tube 10b of the lifting hydraulic cylinder 10 are connected to the inner wire 32a of the release wire 32, 32,
32a, and the release wire 3 extends between a bracket 33 fixed to the cylinder tube 11a of the fixed-rate lifting hydraulic cylinder 11 and a bracket 34 fixed to the frame 24.
2 and 32 outer wires 32b and 32b are attached, and as the cylinder tubes 10b and 11a are moved apart as the fixed-rate lifting hydraulic cylinder 11 is extended, the wire-drawing marker 25 in the operating position is moved by the elastic force of the spring 26. It is configured to switch to the retracted position and swing against the force.

Next, another example will be described.

Figures 4 to 6 show the case where the present invention is applied to a different model of walking type rice transplanter. Of the drive elevating mechanism B, wheel fixed-quantity lowering mechanism C, and attitude switching mechanism D installed therein, the drive elevating mechanism B is connected to a hydraulic cylinder 40 for elevating and a first transverse axis that is linked to its telescopic operation. 41, a pair of left and right damper-equipped rods 43, 43 that swing the transmission cases 7, 7 up and down in conjunction with the swing of the arm 42; The torsion bar 44 connects the rods 43, 43.

Also, a spool 45a of a control valve 45 interposed in the hydraulic circuit of the lifting hydraulic cylinder 40.
and the float 8 are interlocked by an L-shaped link 47 and a rod 48 that are swingable around the second horizontal shaft 46,
In order to keep the height of the seedling planting device 4 relative to the mud constant based on the vertical movement of the float 8 as the depth of the plow changes, the propulsion wheels 6, 6 are moved in the opposite direction to the displacement direction of the float 8. It is configured to control the elevation.

The second horizontal shaft 46 is provided with a press lever 49 that can swing by pressing the L-shaped link 47 only toward the wheel lowering side, and this press lever 49 and the operating lever 21 of the planting clutch 20 are linked by a link mechanism 50. Thus, the propulsion wheels 6, 6 are driven and lowered in conjunction with the clutch release operation of the operating lever 21.

The wheel quantitative lowering mechanism C includes a rod member 51 that slides in the front-rear direction with respect to the other end of the L-shaped link 47 in conjunction with the swinging of the arm 42 of the drive lifting mechanism B, and the propulsion wheels 6, 6 that are When the control valve 45 is lowered to the lowered position, the control valve 45 is lowered to the vertical neutral position via the L-shaped link 47. The rod member 51 is slidable in the longitudinal direction of the rod member 51 located between the tool 52 and the L-shaped link 47, and has a wavy locking surface formed on the rod member 51 over its entire length in the longitudinal direction. It has a spring 54 that biases the sliding fixation protrusion 53 in the locking direction, which can be freely engaged with and detached from the rod member 51a, and has a spring 54 that is similar to the pressing abutting tool 52 when it is slidably fixed to the rod member 51. A stopper 55 that performs a wheel lowering limiting action, and when this stopper 55 is in a freely sliding state, the distance H between this stopper 55 and the L-shaped link 47 is determined by the L-shaped link 4.
7, and when the stopper 55 is in a fixed position, the rod member 5
L-shaped link 4 of stopper 55 as movement of 1
Stopper 55 to allow close movement to the 7 side.
and the L-shaped link 47.
It consists of 6.

Therefore, when the stopper 55 is in a fixed position, the propulsion wheels 6, 6 are moved downward by the rod member 51.
Due to the movement of the stopper 55, the L-shaped link 47
is pressed down to lower this L-shaped link 47 until it switches to the neutral position. Therefore, stopper 55
By setting the distance H between the L-shaped link 47 and the L-shaped link 47, when the propulsion wheels 6, 6 have descended by a certain amount, it is possible to automatically stop the descent of the propulsion wheels 6, 6.

The sliding fixation protrusion 53 is connected to the operating lever 21 via a release wire 57, and when the operating lever 21 is operated to the clutch release position (OFF), the elastic biasing force of the spring 54 causes the rod member 51 to be shaped like a wave. It is configured to engage with the locking surface 51a.

The attitude switching mechanism D includes an elevating hydraulic cylinder 40
piston rod 40a and cylinder tube 4
Brackets 58, 59 fixed to 0b, respectively
A rod member 60 is slidably held across the rod member, a release wire 61 that connects the rod member 60 and the wire-drawing marker 25, and a release wire 61 that is freely engageable and detachable from a wavy locking surface 60a formed on the rod member 60. A lock member 62, a spring 63 that biases the lock member 62 in the locking direction, and the lock member 62
and a release wire 6 that connects the operating lever 21.
It consists of 4.

Therefore, when the operating lever 21 is operated to the clutch disengaged position (OFF), the locking member 62 engages with the wavy locking surface 60a of the rod member 60, and the hydraulic pressure is applied to extend the wheel quantitatively lowering mechanism C by a certain amount. The rod member 60 slides integrally with the cylinder 40, and the line drawing marker 25 in the operating position is switched to the retracted position against the biasing force of the spring 26.

Components having the same structure or function as those in the first embodiment are given the same numbers, and their explanations will be omitted.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the walking type paddy field work machine according to the present invention, Figure 1 is a linkage system diagram showing the elevation of the propulsion wheel and switching of the posture of the line marker, and Figure 2 is the elevation drive unit. Fig. 3 is an overall side view of the rice transplanter. 4 to 6 show another embodiment, FIG. 4 is a partially cutaway side view, FIG. 5 is an enlarged sectional view of the wheel quantitative lowering mechanism, and FIG. 6 is a linkage showing the attitude switching of the line marker. It is a system diagram. B... Drive lifting mechanism, C... Wheel quantitative lowering mechanism, D... Posture switching mechanism, 4... Paddy field work machine, 6
... Propulsion wheel, 25 ... Line marker.

Claims (1)

[Scope of utility model registration request] The propulsion wheel 6 is attached to a body equipped with a paddy field working device 4 and a drive lifting mechanism B for driving and lowering the propulsion wheel 6.
A walking type paddy field working machine is provided with a wheel quantitative lowering mechanism C that lowers the wheel by a certain amount, and a pair of left and right delineation markers 25, 25 that can move in and out in the lateral direction with respect to the moving direction of the machine, the wheel quantitative lowering mechanism C. In conjunction with the operation of C, the line drawing markers 25, 25
A walking type paddy field work machine equipped with a posture switching mechanism D that switches the operation posture from an operating posture to a retracted posture.