JPH01243914A - Farm working machine - Google Patents

Abstract

PURPOSE:To obtain a farm working machine capable of satisfactorily horizontally maintaining and controlling a machine body by forcedly ascending and descending either one of left and right running wheels, when the change of inclination in left and right directions of the machine body is large and the wheels does not cope wit mechanism ascending and descending counter to the change. CONSTITUTION:When the change in the inclination in left and right directions of a machine body is small, the machine body is horizontally maintained with a mechanism 3 forcedly ascending and descending both of left and right running wheels 1 and 2 and mechanism 4 ascending and descending the wheels 1 and 2 counter to the change in a definite range. When the change of the inclination in the left and right directions is large and does not cope with the mechanism 4, the machine body is horizontally maintained with the mechanism 5 forcedly ascending and descending either one of wheels 1 and 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an agricultural machine in which a rice transplanting device, a seeding device, etc. are attached to a traveling vehicle body having a mechanism for raising and lowering left and right traveling axles.

[Prior art]

Conventionally, as seen in Japanese Unexamined Patent Publication No. 52-131823, in a walk-behind rice transplanter, the inclination of the machine body in the left and right direction is detected and the left and right running axles are forcibly raised and lowered by hydraulic pistons to tilt the machine body. There was something to fix.

[Problem that the invention seeks to solve]

In the conventional technology described above, after detecting the inclination of the aircraft, hydraulic pistons are used to forcibly move the left and right running wheels up and down in opposite directions to correct the inclination of the aircraft.Therefore, there is a time lag between detection and correction, resulting in an increase in the aircraft's tilt. It is not possible to perform appropriate control for small inclinations, and it is also not possible to handle cases where the inclination of the aircraft in the left-right direction changes frequently.

[Means to solve the problem]

This invention requires the following technical means in order to solve the problems of the prior art described above.

That is, the present invention provides a mechanism 3 for forcibly raising and lowering both the left and right running wheels 1.2 and a mechanism 4 for raising and lowering the left and right running wheels 1 and 2 in a contradictory manner within a certain range, and a mechanism for raising and lowering the left and right wheels 1 and 2 in a contradictory manner. This agricultural working machine is characterized in that it is provided with a mechanism 5 for forcibly raising or lowering one of the left and right running axles 1 and 2, which is activated upon detecting that the left and right traveling axles 1 and 2 are activated beyond a certain range.

〔Effect of the invention〕

According to this invention, when the fluctuation in the horizontal tilt of the aircraft body is small, the mechanism 3 that forcibly raises and lowers both the left and right wheels 1 and 2 and the left and right wheels 1 and 2 are raised and lowered in a contradictory manner within a certain range. The mechanism 4 maintains the aircraft properly horizontally, and if there is a large variation in the horizontal tilt of the aircraft and the mechanism 4, which raises and lowers the aircraft in a contradictory manner, cannot cope with the change, one of the left and right running wheels 1 and 2 can be adjusted. Since the machine body can be maintained horizontally by forcibly raising or lowering one of the left and right running wheels 1.2 using the forced elevating mechanism 5, extremely good control of maintaining the machine body horizontally can be performed.

〔Example〕

Reference numeral 6 denotes a frame of the rice transplanter, which is a cylindrical pipe-shaped frame fixed to the rear of the traveling transmission case 7. Reference numeral 8 designates an engine stand fixed to the front part of the traveling transmission case 7, and reference numeral 9 represents an engine mounted on the engine stand 8. Reference numeral 10 denotes a planting mission case, which is fixedly installed above the middle part of the frame 6, and consists of a main case part 10a, a cylindrical case part 10b projecting to both left and right sides, and a sub case 10c attached to the tip thereof.

Reference numeral 11 denotes a control handle, the base of which is fixed to the rear end of the fly 1% 6 and divided into two parts toward the rear and upward.

Reference numeral 1.2 denotes left and right traveling wheels, which are rotatably supported on the rear ends of the left and right chain cases 12 and 13, which are rotatably attached to bosses surrounding the drive shafts protruding from both left and right sides of the traveling transmission case 7. It is installed so that it can be moved up and down. Reference numerals 14 and 15 denote left and right arms 11 that are integrally provided to the left and right chain cases 12 and 13, respectively.

Reference numeral 16 denotes a hydraulic case, which is fixed to the upper part of the traveling transmission case 7. The hydraulic case 16 is composed of a hydraulic pump 17, hydraulic switching valves 18, 19, a hydraulic tank 20, and a hydraulic cylinder 21.

Reference numerals 22 and 23 indicate switching levers fixed to the rotary spools of each of the hydraulic switching valves 18 and 19.

Reference numeral 24 denotes a balance rod, which is rotatably pivoted by a pin 27 to a sliding boss 26 that is externally fitted onto a hydraulic piston 25 that moves back and forth in the hydraulic cylinder 21 so as to be slidable within a certain range. The sliding boss 26 is fitted onto the small diameter portion 25a of the piston 25, and a compression spring 29 is disposed between the sliding boss 26 and a stopper 28 which is fitted onto the small diameter portion 25a and is in contact with the stepped portion 25b of the piston 25. is provided. 30 is piston 2
This is a stopper for preventing removal of the sliding boss 26 fixed at the tip of 5 with three bolts. The right end of the balance rod 24 is connected to the upper end of the right arm 15 provided on the right chain case 13 via a hydraulic cylinder 32 and a hydraulic piston 33 (mechanism 5 for forcibly raising and lowering one of the left and right wheels 1 and 2). The left end of the balance rod 24 is connected to the upper end of a left arm 114 provided on the left chain case 12 via a connecting rod 34. Therefore, the left and right wheels 1 and 2 are rotated in a contradictory manner by the rotation of the balance rod 24 about the pin 27 (by the mechanism 4 that raises and lowers the left and right wheels 1 and 2 in a contradictory manner within a certain range). The hydraulic piston 25 is configured to move up and down in the hydraulic cylinder 21.
By moving forward and backward (by a mechanism 3 that forcibly raises and lowers both the left and right running wheels 1 and 2), the wheels are forcibly raised and lowered together.

Further, one end side of the inner wire 37 of the push-pull connecting wire 36 is pivotally connected to an arm 35 fixed to the sliding boss 26, and the other end side is connected to the switching lever 23 fixed to the rotary spool of the hydraulic switching valve 19. Pivotally connected, outer wire 3
8 by locking one end side to the balance rod 24 and locking the other end side to the machine frame.

When the balance rod 24 is tilted more than a certain level (left and right running wheels 1.2
is raised and lowered in a contrary manner beyond a certain range), the hydraulic switching valve 19 is switched by the connecting wire 36, and the hydraulic piston 33 moves forward and backward from the hydraulic piston 32, causing the right-hand vehicle 1i to move forward and backward.
The i12 is configured to be raised and lowered.

Reference numeral 39 denotes a synthetic resin float-shaped central leveling body that is long in the longitudinal direction at the lower center of the fuselage, and the rear part is connected to the frame 6.
It is pivotally mounted near the bending part of the engine via a pin 40, and the front part is attached to the engine stand 8 via a link mechanism 41 so as to be able to move up and down, and is used to slide and level the soil surface. 42.
Reference numeral 43 denotes a synthetic resin float-like outer ground leveling body, which is arranged so that its front part is located outside the left and right running wheels 1.2, and its rear part is attached to a pin 40 near the bent part of the frame 6.
The front part is attached so as to be movable up and down via link mechanisms 44 and 45, and is designed to slide on the soil surface and level the ground. The connecting rod 4 is connected to the metal fitting 46 fixed on the front upper surface of the central ground leveling body 39 and the switching lever 22 fixed to the rotary spool of the hydraulic switching valve 18.
When the front part of the central ground leveling body 39 moves up and down, the hydraulic switching valve 18 is switched and the hydraulic piston 25 moves back and forth in the hydraulic cylinder 21, so that the left and right running wheels 1 and 2 move up and down together. is configured to do so.

Reference numeral 48 denotes a seedling planting device, in which rotating cranks 4 are installed in both the main and sub cases 10a, 10c, and 10c of the planting transmission case 10, respectively.
9 and a swing arm 50 so as to be able to swing up and down. Reference numeral 51 denotes a seedling tank, which is supported on the rear part of the frame 6 and above the control handle 11 so as to be movable left and right, and is provided so as to be moved left and right by a left and right reciprocating mechanism in the planting transmission case 10.

Reference numeral 52 denotes a seedling support frame, the side surface of which is approximately L-shaped, and is fixed to the upper side of the frame 6, with seedling dividing openings 53...
is provided, and the seedling dividing claw 48a of the seedling planting device 48 intervenes in the seedling dividing 1153 from above to take out the seedlings accommodated in the seedling tank 51 one by one.

An operation panel 54 is fixed to the rear end of the frame 6, and is provided with an engine starting switch 55, a planting clutch operation lever 56, a hydraulic operation lever 57, and a main clutch lever 58.

Transmission belts 59 and 60 are provided to transmit the power of the engine 9 to the traveling transmission case 7 and the hydraulic case 16, respectively. 61 is a transmission shaft, which transmits power from the traveling mission case 7 to the transmission case 10.
It is provided to transmit power to the

In the upper configuration, after the rice transplanter is placed in the paddy field,
Place seedlings in the seedling tank 51, start the engine 9,
Main clutch lever 58 and planting clutch operating lever 56
When each clutch is connected at , and the hydraulic operation lever 57 is set to the automatic control position where the left and right traveling wheels are automatically raised and lowered according to the depth of the plowing platform, the rotation of the left and right traveling wheels 1 and 2 moves each soil leveling body 39 .42.The aircraft is propelled with the 43 in contact with the soil surface of the paddy field, and the seedling planting devices 48 are arranged in parallel in the left and right direction.
. . . moves vertically in an elliptical planting trajectory, and divides and engages seedlings one by one from the seedling tank 51, which is being reciprocated from side to side, onto the soil surface leveled by each leveling body. Plant them one after another.

During such seedling planting work, if the plowing surface changes such as becoming shallower or deeper, the left and right running wheels 1 and 2 are automatically raised and lowered as follows.

First, when the tiller is deep only in the front-rear direction, the ground leveling bodies 39, 42, and 43 are both pushed upward as the machine body descends.

Then, when the ground leveling body 39 is pushed upward beyond a certain level (when it is pushed up toward the machine body beyond the range appropriate for seedling planting work), the hydraulic switching valve 18 is activated via the connecting rod 47 and the switching lever 22. The rotary spool is switched to the side where the hydraulic piston 25 advances, and therefore the hydraulic piston 25 advances and both the left and right traveling wheels 1 and 2 are moved down.

Then, when the left and right running wheels 1 and 2 gradually come into strong contact with the tiller and the machine floats up, each ground leveling body 39,
When the ground pressure of 42 and 43 gradually decreases and reaches a proper state, the hydraulic switching valve 18 becomes a neutral state, and the downward movement of the left and right running wheels 1 and 2 is stopped.

If the plowing platform becomes shallow only in the front-back direction, it is the opposite of what was described above, and since each soil leveling body 39, 42, 43 is slightly floating and moves downward from the machine body, the rotary spool of the hydraulic switching valve 18 is connected to the hydraulic piston 25. As a result, the hydraulic piston 25 receives the load of the aircraft and moves back and forth, causing both the left and right traveling wheels 1 and 2 to move upward.When a proper grounding condition is achieved, the hydraulic switching valve 18 is switched to the retracting side. returns to neutrality.

Next, to explain the case where the plowing depth is different on the left and right sides, if the plowing depth is different on the left and right sides, the support load of the left and right running wheels 1 and 2 changes, so the support of the left and right running wheels 1 and 2 is different. The balance rod 24 rotates around the pin 27 so that the load is the same, and the body is maintained horizontally in the left and right direction. However, when the balance rod 24 rotates beyond a certain level, the hydraulic switching valve 19 is switched beyond the neutral range by the push-pull connecting wire 36, the hydraulic piston 33 advances and retreats, the right traveling wheel 2 moves up and down, and the aircraft is leveled. It operates in such a way that it is maintained. To explain in more detail the case where the depth of the plow differs greatly between the left and right sides, first, when the right side is deeper and the left side is shallower, the right wheel 2 will naturally lower and the left wheel 1 will be lowered.
The balance rod 24 rotates in the A direction so that it moves upward, but the hydraulic piston 33, which switches the hydraulic switching valve 19 beyond the neutral range by the push-pull connecting wire 36, advances and the right traveling wheel 2 descends. be done. Then, the right traveling wheel 2 comes into contact with the tiller, the supporting loads of the left and right traveling vehicles @1 and 2 become the same, and the balance rod 24 rotates in the direction A.

When the acting force that tends to move is removed, the hydraulic switching valve 19 enters the neutral region, the hydraulic piston 33 stops advancing, and the aircraft body is maintained in a horizontal state in the left-right direction. On the other hand, when the left tiller is shallow and the right tiller is deep, it goes without saying that the control is just the opposite of the above and the machine is held horizontally in the same way.

When performing horizontal horizontal control of the aircraft, in particular, the left and right traveling wheels 1 and 2 are connected by the balance rod 24 and the pin 2 is connected.
Since the balance rod 24 is configured to rotate within a certain range around 7 rotations, and the left and right running wheels 1 and 2 are configured to move up and down within a certain range in a contrary manner, even if the plowing depth is different on the left and right sides. , when the amount of difference is small, the machine body is maintained horizontally by the opposite vertical movements of the left and right running wheels 1 and 2, and only when the plowing depths on the left and right sides are significantly different (left and right running wheels 1, 2).
(2) When correction cannot be made due to the contradictory vertical movement of 2), the hydraulic piston 33 is actuated.Since the horizontal control is activated, the left and right traveling wheels 1, 2. The forced vertical movement is avoided, and the aircraft is less likely to vibrate from side to side due to the drive reaction force caused by the forced vertical movement.
In addition, when the depth of the plow differs greatly, the hydraulic piston 3
3 operates, the driving reaction force due to the operating force of the hydraulic piston 33 that forcibly moves the right running wheel 2 downward is absorbed by the rotation of the balance rod 24, so the running condition is very stable. This results in extremely good running performance in paddy fields.

[Brief explanation of the drawing]

The figures show a walk-behind rice transplanter which is an embodiment of the present invention; Fig. 1 is an overall plan view, Fig. 2 is a side view,
FIG. 3 is a hydraulic circuit diagram. Symbols in the figure: 1.2 is the left and right traveling axle, 21 is the hydraulic cylinder, 25 is its hydraulic piston, 32 is the hydraulic cylinder.
33 is the hydraulic piston, 17 is the hydraulic pump, 18.1
9 is a hydraulic switching valve, 24 is a balance rod, 39 is a central leveling body, 42 and 43 are outer leveling bodies, 48 is a seedling planting device, and 51 is a seedling tank.

Claims (1)

[Claims] A mechanism 3 for forcibly raising and lowering both the left and right running wheels 1 and 2 and a mechanism 4 for raising and lowering the left and right running wheels 1 and 2 in a contradistinct manner within a certain range are provided, and the mechanism 4 for raising and lowering the left and right wheels in a contrarily manner exceeds a certain range. This agricultural machine is characterized in that it is provided with a mechanism 5 for forcibly raising or lowering one of the left and right running wheels 1 and 2, which is activated upon detecting that the wheel is activated.