JPH08228524A - Agricultural working machine - Google Patents

Abstract

PURPOSE: To automatically carry out height control on a working machine side while preventing the oil temperature of a lifting cylinder from raising by a simple constitution using a timer. CONSTITUTION: In this agricultural working machine constituted so as to liftably support a working machine 10 through a lifting cylinder 58 on a machine body and operate the lifting cylinder 58 by the output signal from a height sensor 1, a timer for stopping the output on the way is provided, when the output signal for outputting from the height sensor 1 to the lifting cylinder 58 ranges over long period exceeding a prescribed time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural working machine such as a transplanter.

[0002]

2. Description of the Related Art Conventionally, a transplanter has a moving unit such as a tractor which supports a planting unit equipped with a seedling stand and a planting claw so that the planting unit can be freely moved up and down through the elevator cylinder. While raising and lowering, the planting claws are used to plant seedlings at a certain depth in the field scene.

In such a transplanter, a height sensor is provided on the side of the planting unit, and at the time of planting work of seedlings by the planting unit, the wheels provided on the traveling machine body and the unit are recessed in the ground. When the height of the unit from the ground fluctuates up or down due to falling in or riding on a convex part, the height of the unit is adjusted up and down by driving the cylinder up and down based on the output from the sensor. Then, the planting depth of the seedlings by the planting claws provided on this unit side is adjusted so as to be always constant.

[0004]

By the way, when the height sensor as described above is used, when the sensor malfunctions, or when the wheel continues to fall into the uneven portion of the ground or continue to ride. The sensor continuously outputs a lifting drive command signal to the lifting cylinder side, and oil is supplied and drained in this cylinder for a long period of time, so that the oil temperature continues to rise, resulting in inconvenience such as damage to parts. . Therefore, in order to solve such an inconvenience, limit switches for detecting the stroke end of the elevating cylinder in the advancing / retreating direction are provided respectively, and when the cylinder is advanced / retracted to the stroke end, each limit switch is used to move the cylinder. It is necessary to stop the lifting operation to prevent the oil temperature from rising above a certain temperature.

An object of the present invention is to provide an agricultural work in which the height of the working machine can be automatically adjusted while preventing a rise in the oil temperature with a simple structure without providing a limit switch or the like on the lifting cylinder. To provide a machine.

[0006]

In order to achieve the above-mentioned object, the present invention supports a working machine 10 in a freely movable manner on a machine body 50 via a lifting cylinder 58, and a lifting drive command signal output from a height sensor 1. In the agricultural working machine in which the lifting cylinder 58 is driven up and down based on the above, when the lifting drive command signal output from the sensor 1 to the cylinder 58 exceeds a predetermined time for a long time, the timer 5 is provided to cut off the output midway. .

[0007]

When the working machine 10 is operated, the wheels of the working machine 10 fall into the uneven portion of the ground or climb up, and
When the height from the ground fluctuates up and down, the height sensor 1 outputs a lifting drive command signal to the lifting cylinder 58 side, and the lifting operation of the cylinder 58 causes the working machine 1 to move.
0 is automatically adjusted to a predetermined height. Then, at this time, in the case where the sensor 1 malfunctions, or when the wheel continues to fall into the uneven surface of the ground or continue to ride,
When the output from the sensor 1 reaches a predetermined time set by the timer 5, the output from the sensor 1 is stopped by the timer 5 without being continued. Therefore, as compared with the case where a conventional limit switch is provided, the automatic height adjustment of the working machine 10 can be performed while preventing the oil temperature in the cylinder 58 from rising with a simple configuration.

[0008]

EXAMPLE A farming machine shown in FIGS.
A double-row planting type transplanter in which a pair of left and right unit type planting devices are connected as the working machine 10 is shown on the rear side of the tractor which is 0. The tractor 50 is a known one, and an engine (not shown) is mounted on the front upper part thereof.
A traveling mission case 52 having a PTO shaft 51 is provided on the rear side thereof, a pair of left and right drive wheels 53 are supported on both sides of the mission case 52, and a driver's seat 54 and a hydraulic type are provided above the traveling mission case 52. An elevating cylinder 55 is provided, and on the rear side of the elevating cylinder 55, a pair of left and right lift arms 56 that are vertically swung by the cylinder 55, a pair of left and right lower links 57 that can move up and down, and a top link are configured. One hydraulic type link cylinder 58 is provided.

The tip end side of the lift link 56a connected to each of the lift arms 56 is attached to each of the lower links 56.
As shown in FIG. 5, when the vehicle is traveling on the road or working in the field, the lift arms 56 are vertically moved in accordance with the operation of the lifting cylinders 55, and thus the planting devices are pivoted to the middle portion of the planting device. The whole 10 is moved up and down around a support shaft 57a of the lower link 57 with respect to the mission case 52.

A rectangular tubular tool bar 59 extending in the left-right direction and a substantially U-shaped hitch frame 60 extending rearward are attached between the tip ends of the lower links 56, and a link frame extending upward in the lower links 56. 61 is pivotally attached, while the piston rod portion 58a of the link cylinder 58 is pivotally attached to the upper end of the link frame 61. Further, between the upper ends of the link frames 61, guide rails 62 for sliding the planting devices 1 in the left-right direction are attached.

On the rear end side of the hitch frame 60, a T-shaped gear case 64 containing a gear that interlocks with the PTO shaft 51 via a universal shaft coupling 63 is mounted, and a horizontal PTO shaft extending in the left-right direction is attached to the gear case 64. 65 is rotatably supported, and slide bodies 67 having a pair of bearing cylinders 66 are slidably supported on the left and right sides of the toolbar 59, and the tractor 50 side is provided with the slide bodies 67 through the slide bodies 67. The bearing device 6 is supported, and the bearing tubes 6 are also provided.
6 supports both sides of the PTO horizontal shaft 65.

A pair of left and right hitch plates 68 are attached to the front end of the lower end of each of the planting devices 10. The hitch plates 68 are rotatably supported by the bearing cylinders 66 of the slide bodies 67, and the slides of the hitch plates 68 are also attached. A connecting link 70 is pivotally mounted between the restriction bar 69 provided on the moving body 67 and the upper side of each of the hitch plates 68, and the top link 58 is expanded / contracted based on the output from a height sensor described later during work traveling. By doing so, each of the planting devices 10 is vertically swung about the PTO horizontal axis 65, and the planting depth of the planting claws provided in each of the planting devices 10 is adjusted to a constant depth. I am able to do it.

Further, as is apparent from FIGS. 6 to 8, each of the planting devices 10 can reciprocate in the front-rear direction between the unit frame 11 having the guide rails 12 at the upper and lower portions and the guide rails 12. A chopstick-shaped support for picking up one pot of seedlings from a seedling tray 13 which is vertically supported by the plant and a seedling tray 14 which is supported on the seedling tray 13 and accommodates a large number of pot seedlings. Of the seedling taking claw 15 and up and down reciprocating while drawing a predetermined planting locus in conjunction with the seedling taking claw 15, and receives pot seedlings discharged from the seedling taking claw 15 at the seedling receiving position on the upper part thereof, and the lower part The planting claws 16 are provided for planting pot seedlings in the field at the planting position. And
Each unit frame 11 is provided with a planted drive case 17 that interlocks with the PTO horizontal axis 65.
Through the plurality of transmission cases 18 connected to the PTO.
Rotational power from the horizontal axis 65 is applied to the seedling picking nail 15 and the planting nail 16
I am trying to reach you.

A sensor frame 19 extending rearward is attached to the transmission case 18 on the drive case 18 side.
A leveling frame 21 is pivotally supported on the front end side of the sensor frame 19 via a parallel link 20, and a pair of left and right compression wheels 22 corresponding to the respective planting devices 10 are freely rollable via the leveling frame 21. Support. Further, at the rear end of the sensor frame 19, a soil cover arm 24 is rotatably supported by a pivot shaft 23, and a pair of left and right soil cover wheels corresponding to the respective planting devices 10 are provided via the soil cover arm 24. 25 is swingably supported vertically with respect to each unit frame 11, and the base end of the soil cover arm 24 and one of the parallel links 20 are connected by a rod 26, while the rear end of the sensor frame 19 is left and right. A transmission rod 27 is attached to the upper side of the earth-covering wheel 25, and a planting lever 28 is attached via the transmission rod 27.
And also supports the transmission rod 27 and the soil cover arm 24.
Are connected to each other by a connecting rod 29, and the compression wheel 22 and the earth covering wheel 25 are both moved up and down in the same direction in accordance with the operation of the implantation depth lever 28, so that the wheels 22 and 25 and the units The relative height with the planting claw 16 supported on the frame 11 side is adjusted up and down so that the seedling planting depth by the planting claw 16 can be finely adjusted.

Further, between the unit frames 11 and the transmission rods 27 provided on the upper side of the right and left earth covering wheels 25, the planting claws 16 of the planting devices 10 are planted within a range where seedlings can be planted. A pair of left and right height sensors 1 for detecting depth changes are provided respectively. As the height sensor 1, in the embodiment of FIG. 7, a raising switch 1a and a lowering switch 1b for detecting a planting depth change of the planting claw 16 in a seedling planting range are provided,
Above the raising switch 1a, the upper end switch 1 for detecting that the planting depth by the planting claw 16 is the limit.
c is provided. And each unit frame 1
The operating body 2 of each of the switches 1a to 1c is supported on the first side in a vertically swingable manner, and the operating body 2 and the transmission rod 27 are supported.
A sensor arm 3 is provided between the switch 1a, 1b, and the operation dog 2a of the actuating body 2 along with the vertical movement of the sensor arm 3 that follows the earth covering wheels 25.
1c is pushed, and the piston rod 58a of the link cylinder 58 is expanded / contracted via the link valve 100 of FIG. 1 based on the detection signals output from each of these persons. Is vertically swung about the PTO horizontal axis 65, and the planting depth of the seedlings by the planting claws 16 is automatically adjusted. In the figure,
Reference numeral 4 denotes an implantation depth adjusting lever for adjusting the contact position of the actuating body 2 with respect to each of the switches 1a to 1c.

Further, as shown in FIG. 9, a slide frame 72 having gap adjusting shafts 71 at both ends is provided between the slide bodies 67 slidably supported by the tool bar 59.
Is mounted so that its position can be adjusted in the left-right direction, and the hydraulic slide cylinder 73 is attached to the central portion of the tool bar 59.
And the piston rod 74 of the cylinder 73 is pivotally attached to the slide frame 72, and the roller 75 provided on the upper end side of the regulation bar 69 provided on each sliding body 67 is attached to the upper end of each link frame 61. The guide rail 62 provided in between is allowed to freely roll over. In addition, as shown in FIGS. 7 and 8, the sensor frame 1
9 is a pair of left and right ridge sensors 31, which are opposed to both outer side surfaces of each ridge A on which seedlings are planted by the respective planting devices 10.
31 and the guide rollers 32, 32 are attached via the arm 30, and the piston rod 74 of the slide cylinder 73 is expanded / contracted via the electromagnetic slide valve 101 of FIG. 1 according to the detection signals output from the respective ridge sensors 31. The offset positions of the planting devices 10 can be simultaneously adjusted in the same left and right direction through the sliding bodies 67.

On the side of the tractor 50, a lift sensor 33 for detecting the lifting operation of the lift arm 56.
Attached, and each planting device 1 via the lift arm 56.
When 0 is lowered to a predetermined working position, a detection signal is output from the lift sensor 33, and at the time of this output, the link valve 100 based on each of the sensors 1a to 1c.
The link cylinder 58 is expanded and contracted by means of.

Further, a gauge wheel 35 for adjusting the overall height of each planting device 10 is provided at a rear intermediate portion of each planting device 10 via a support rod 34 installed between the respective unit frames 11. It is arranged.

In the above structure, however, as shown in FIG. 1, the lift sensor 33 is provided between the automatic switch 102 for automatically raising and lowering the planting device 10 and the link valve 100 of the link cylinder 58. And a pair of left and right switches 1a to 1c provided as the height sensor 1 on the upper side of each of the soil covering wheels 25, and output signals from the switches 1a to 1c are output over a predetermined set time. At this time, the timers 5 and 5 that cut off the output are connected.

Specifically, the respective upper switches 1a and the respective lower switches 1b are connected in series, and the respective upper end switches 1c are connected in parallel, and the respective upper end switches 1c and the respective upper switches 1a are connected to each other. The piston rod 58a of the link cylinder 58 is advanced to connect the rising side solenoid 100a of the link valve 100 for raising each planting device 10 via a timer 5, and the lowering switch 1b is connected to the piston rod 58a.
Is connected to the descending side solenoid 100b of the link valve 100 for retracting each planting device 10 via the timer 5.

Then, the automatic switch 102 is turned on to perform automatic seedling planting by each of the planting devices 10,
In addition, when the lift arm 56 is moved down to a predetermined working position and the lift sensor 33 is turned on,
The traveling wheels 53 on the side of the tractor 50 and the gauge wheels 35 traveling on the ground between the ridges A fall or ride on the uneven portions of the ground, and the movement of each of these wheels 53, 35 causes the unit frame to move. Each of the soil-covering wheels 25 freely supported by 11 moves up and down, and the relative heights of the respective soil-covering wheels 25 and the planting claws 16 supported by the unit frames 11 vary accordingly. , The raising and lowering sensors 1a, 1 via the actuating body 2 by the sensor arm 3
When b is turned on, each of these sensors 1a, 1b
From the link valve 100 via the timer 5
An elevation drive command signal is output to each solenoid 100a, 100b, and the piston rod 58a of the link cylinder 58 is advanced and retracted based on this, thereby automatically adjusting each planting device 10 to a predetermined height. Planting nail 1
The planting depth of the seedlings according to 6 is automatically adjusted to be constant.

Further, when each planting device 10 is lowered to the planting depth limit of the planting claw 16 due to the fall of each of the wheels 53 and 35 to the ground, etc., the sensor arm 3 causes the upper end of the planting device 10. The switch 1c is turned on, an output signal is output from the upper end switch 1c to the ascending side solenoid 100a of the link valve 100, and the piston rod 58a is advanced to raise each planting device 10.
In addition, at the time of vertically adjusting each planting device 10 by the raising and lowering sensors 1a and 1b, the left and right sensors 1
Since a and 1b are connected in series, vertical adjustment by the link cylinder 58 is performed only when the sensors 1a and 1b are both turned on, and the upper end switches 1c are connected in parallel. Therefore, even if one side of each of the soil covering wheels 25 is moved upward and one of the upper end switches 1c is turned on, each of the planting devices 10 is moved upward by the link cylinder 58. Improper planting by the planting claw 16 is prevented.

However, in the case where the above-mentioned switches 1a to 1c malfunction, or the traveling wheels 53 and the gauge wheels 35 fall into the uneven portion of the ground or continue to ride on during the above work. , The switches 1a to 1
When the output from c reaches a predetermined time set by each timer 5, the output from each of the switches 1a to 1c is cut off midway. That is, as shown in FIG. 2, for example, the set time by each of the timers 5 is set to T0, and the output time of the up signal, the down signal and the upper end signal from each of the switches 1a to 1c is set to T1, and the output time is set to T1. T1
Is longer than the set time T0, the output signals from the switches 1a to 1c are stopped when the set time T0 is reached, and the lifting operation of the link cylinder 58 is stopped. Therefore, it is possible to prevent the oil temperature in the cylinder 58 from rising due to the upward and downward movement of the link cylinder 58 being continued for a long time with a simple configuration using the timers 5.

Further, in FIG. 1, left and right ridge sensors 31 are connected between the automatic switch 102 and the slide valve 101 for operating the piston rod 74 of the hydraulic slide cylinder 73 to connect the ridge A to the ridge A. The slide cylinders 73 are expanded and contracted by the on / off operations of the ridge sensors 31 corresponding to the left and right bends to control the lateral movement of the respective planting devices 10. still,
In the figure, 103 is a toggle switch for manually operating the link valve 100, and 104 is a toggle switch for manually operating the slide valve 101.

Further, as shown in FIG. 10, an operating rod 38 having a dog 37 at one end in the length direction is supported by a support 36 provided on the unit frame 11 so as to be swingable about a pivot shaft 39, The sensor arm 3 extending upward from the earth-covering wheel 25 side is connected to the other end in the length direction of the operating rod 38, and the lowering switch 1b, the raising switch 1a, and the upper end are attached to the unit frame 11 from the upper side thereof. The switches 1c may be sequentially arranged so that each of the switches 1a to 1c is turned on by the dog 37 via the sensor frame 3 when the height of the soil covering wheel 25 with respect to the planting claw 16 changes.

Further, as shown in FIG. 11, a frame 40 extending rearward is coupled to the transmission case 18 provided on the planting drive case 17 side, and the parallel link 20 is provided on the front side of the frame 40. Supports the leveling frame 21, and supports the compression wheel 22 via a supporting rod 42 having an operating portion 41 on the leveling frame 21, and the pivot shaft 23 is provided on the rear side of the frame 40. Through the soil ring 2
While supporting the soil-covering arm 24 for supporting 5, the pivot shaft 23 side of the soil-covering arm 24 and one of the parallel links 20 are connected by a plurality of rods 26, and the soil-covering arm 24 and the frame 40 are connected. A plurality of rods 43 on the rear end side
And the operating rod 44 is provided on the rear end side of the rod 43, and the operating rod 44 and the operating portion 41 of the support rod 42 are moved up and down, whereby the compression wheel 22 and the soil cover wheel 25 are connected.
And may be moved up and down in conjunction with each other at the same time.

In the embodiment shown in FIG. 7, the hitch plate 68 of each planting device 10 is located on the front side of the compression wheel 22 and corresponds to a seedling planting site by the planting claw 16. A cutter 45 for cutting the upper surface of the ridge A, and this cutter 45
And a leveling plate 46 which is located between the compression wheel 22 and the cutter 45 to level the soil cut by the cutter 45. In each drawing, 47 is a coil spring stretched between the front upper position of each unit frame 11 and the tractor 50 side. Further, in the above embodiment, the transplanting machine in which each planting device 10 is connected to the tractor 50 has been described, but the present invention is not limited to the transplanting machine, and other working machines in which various working machines are connected to the traveling machine body via the lifting cylinder. It can also be applied to agricultural work machines.

[0028]

As described above, according to the present invention,
When the work machine 10 works, when its wheels fall or ride on uneven portions of the ground and the height of the work machine 10 from the ground fluctuates up and down, the height sensor 1 moves up and down to the lifting cylinder 58 side. By outputting a command signal, the working machine 10 can be automatically adjusted to a predetermined height by raising and lowering the cylinder 58, the sensor 1 malfunctions during such work, and the ground uneven portion of the wheel is used. When the output from the sensor 1 reaches a predetermined time set by the timer 5 in the case where the depression or the riding continues, the output from the sensor 1 can be cut off by the timer 5 midway. Therefore, with a simple structure using the timer 5, it is possible to prevent the oil temperature in the cylinder 58 from continuing to rise, and prevent damage to parts or the like.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of an agricultural work machine according to the present invention.

FIG. 2 is a timing chart diagram thereof.

FIG. 3 is a partial side view of a transplanting machine shown as an example of the agricultural working machine of the present invention.

FIG. 4 is an enlarged side view of a connecting portion between the machine body and the working machine.

FIG. 5 is a plan view thereof.

FIG. 6 is a plan view of the planting device.

FIG. 7 is a side view thereof.

FIG. 8 is a rear view thereof.

FIG. 9 is a rear view of the toolbar portion.

FIG. 10 is a side view showing only a main part of another embodiment.

FIG. 11 is a side view showing another embodiment.

[Explanation of symbols]

 1 ... Height sensor 5 ... Timer 10 ... Working machine 50 ... Machine body 58 ... Lifting cylinder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Seki 1-32, Chayacho, Kita-ku, Osaka-shi, Osaka Yanma Agricultural Machinery Co., Ltd.

Claims (1)

[Claims] 1. A lifting cylinder (58) for an airframe (50).
In the agricultural work machine, the working machine (10) is supported to be lifted and lowered freely, and the lifting cylinder (58) is driven up and down based on the lifting drive command signal output from the height sensor (1). An agricultural machine equipped with a timer (5) that cuts off the output of the vertical drive command signal output from 1) to the cylinder (58) during a long period of time exceeding a predetermined time.