JP2595969Y2 - Elevation control device for walking agricultural work machine - Google Patents

Description

[Detailed description of the invention]

[0001]

INVENTION The present invention relates to a lift in a walking type agricultural machine, such as for to implant the seedlings while traveling across the ridge
It relates to the structure of the control device.

[0002]

2. Description of the Related Art In this type of walking type agricultural working machine, the depth of seedling planting on the upper surface of a ridge is substantially constant irrespective of the vertical fluctuation between the running surface of a field and the height of a ridge. It needs to be adjusted. Therefore, conventionally, a ridge height sensor body that moves up and down with respect to the traveling vehicle body is provided. Then, Japanese Patent Application Laid-Open No. 57-99114, etc.
As disclosed, the ridge height sensor body can be turned up and down
Between the rotating lever and the running vehicle.
To provide a spring for pressing and urging toward the upper surface of the ridge.
On the other hand, the base end side of the rotating lever is connected to the operating portion of the hydraulic switching valve.
To rotate in proportion to the amount of vertical movement of the ridge height sensor
The amount of rotation of the rotating lever is transmitted to the operating part of the hydraulic switching valve.
Thus, the hydraulic switching valve is configured to switch up and down.

[0003] Normally, the hydraulic switching valve is moved relative to its neutral position.
Having an up / down switching position through a predetermined dead zone
Is knowledge. However, when the fluctuation of the ridge height is large
To, if example embodiment, when the unevenness of the ridge top surface is severe, the said spring
By the pressing force, the ridge height sensor body and thus the rotating lever
Are not jumping, but
The amount of rotation fluctuation of the moving lever also increases, and the operation of the hydraulic switching valve
There has been a problem that an excessive force is likely to act on the portion and the portion may be damaged.

The purpose of the present invention is to solve this problem.

[0005]

In order to achieve the above object, a lifting control device for a walking type agricultural working machine according to the present invention comprises:
The wheel is mounted on the traveling vehicle body so that it can be moved up and down, and a rotating lever that pivotally supports the base end of the traveling vehicle vertically and vertically is equipped with a ridge height detection sensor that contacts the upper surface of the ridge. , Sensor
Oil for controlling the lifting and lowering of wheels according to the vertical movement of the body
In the walking type agricultural work machine configured to execute control of the pressure switching valve, a spring means for buffering is inserted between the rotating lever and the traveling vehicle body, and the hydraulic pressure is applied through the spring means.
The configuration is such that the switching operation amount of the switching valve is transmitted.
It is a sign .

[0006]

Next, an embodiment of a seedling transplanter embodying the present invention will be described. 1 is a side view of the seedling transplanter, FIG. 2 is a plan view, and FIG. 3 is a rear view. An engine 2 and a switching valve unit 3 for controlling hydraulic pressure are mounted on a front portion of a traveling vehicle body 1 of the transplanter, and a transmission case 4 is fixed to an intermediate portion of the traveling vehicle body 1 in the front-rear direction. Front wheels 5, which are arranged on both left and right sides of the traveling body 1,
5 and rear wheels 6, 6 are mounted on the traveling vehicle body 1 via a lifting mechanism 7, which will be described later.

A rotary pot 9 is provided between the upper part of the traveling vehicle body 1 and a handle 8 projecting rearward and having a U-shape in plan view.
Is disposed below the rotary pot 9, and a transplantation opening device 11 that moves up and down in a substantially elliptical trajectory between the upper surface of the ridge A through a planting link 10 is provided. The planting link 10 is moved up and down, the rotary pot 9 is rotated horizontally, and the transplantation opener 11 is opened and closed. The compression ring 13 is for shaping the ridge A after transplanting the seedling pot N.

[0008] Incidentally, the transplantation opener 11 is connected to the rotary pot 9.
And a tubular body for receiving the seedling pot N dropped and supplied from the rear end pot position, and opening a transplanting hole when piercing the upper surface of the ridge A, and opening the seedling pot N forward and backward in the traveling direction immediately after that. And a split bucket that falls on the Next, the lifting mechanism 7 will be described.
The lifting mechanism 7 has a mechanism in which the right and left wheels 5 and 6 move up and down at the same time, and the traveling vehicle body 1 descends or rises with respect to the ridge A. A so-called rolling mechanism is provided in which the traveling vehicle body 1 tilts left or right in the traveling direction when the wheels descend.

Swing cases 15a, 15b each having a built-in transmission mechanism are rotatably mounted at both ends of a drive shaft 14 projecting from the transmission case 4 to the left and right sides. A rear wheel 6 is attached to the tip of each of the swing cases 15a, 15b. And driven to rotate. The front wheel 5 is mounted on the front end of a connecting rod 16 extending forward from each of the swing cases 15a, 15b, and the connecting rod 16 is connected to a pipe-shaped front frame 17 of the traveling vehicle body 1.
And connected to a front support pipe 18 pivotally attached to the front support pipe 18 so as to reinforce it into a frame-like structure.

A rear end of an elevating hydraulic cylinder 19 is fixedly provided on the lower surface of the front part of the traveling vehicle body 1, and a left and right halfway of an elevating pipe 21 is attached to a piston rod 20 extending forward from the elevating hydraulic cylinder 19. It is configured to move forward and backward along a guide groove 22 opened forward at the front part of the traveling vehicle body, and brackets are provided at both left and right ends of a rolling shaft 23 rotatably inserted into a lifting pipe 21. 24, 25 are fixed to each other upside down, and connected to the respective swing cases 15a, 15b to the respective brackets 24, 25 via lifting link mechanisms 26a, 26b. As a result, when the piston rod 20 of the lifting hydraulic cylinder 19 projects forward, the rolling shaft 23
Is moved forward, so that the right and left lifting link mechanisms 26a,
26b, the free ends of the left and right swing cases 15a, 15b rotate downward, and the left and right wheels 5, 5, 6, 6 move down at the same time, so that the traveling vehicle body 1 is moved to the ridge A. Rise upward away from On the contrary, when the piston rod 20 is retracted, the left and right wheels 5, 5, 6,
6 rises and rotates at the same time, and descends so that the traveling vehicle body 1 approaches the upper surface of the ridge A.

[0011] With this configuration of raising and lowering, the transplanting depth of the seedling pot N to the ridge A can be adjusted, and the seedling can be transplanted to various ridges A having different heights. The rolling mechanism is as follows. That is,
A support 27 that moves back and forth integrally with the lifting pipe 21
Then, a piston rod 29 of a hydraulic cylinder for rolling 28 whose base end is rotatably mounted is connected to a bracket 30 which is attached to a portion of the rolling shaft 23 near one side, and the piston rod 29 is protruded. Figure 4
, The bracket 24 with respect to the left wheels 5 and 6 is rotated upward, and the left lifting link mechanism 26a is pushed backward. Through this, the free end of the swing case 15a is By turning upward, the left wheels 5 and 6 rise with respect to the traveling vehicle body 17.
At this time, on the contrary, the bracket 25 for the right wheels 5 and 6 is turned downward, and the right lifting link mechanism 26b is pulled forward, so that the free end of the swing case 15b is turned downward and the swing case 15b is turned right. The traveling vehicle body 1 is rolled so that the left side thereof faces downward such that the wheels 5 and 6 of the traveling vehicle 1 descend with respect to the traveling vehicle body 17.

When the traveling vehicle 1 travels along a location where the longitudinal direction of the ridge A is formed along the slope of the mountain,
In the rolling mechanism, the height of the wheels closer to the hill side relative to the traveling vehicle body is reduced, the height of the wheels closer to the valley side is increased relative to the traveling vehicle body, and the posture control is performed so that the left and right sides of the traveling vehicle body are substantially horizontal. The seedling pot N can be transplanted substantially vertically on the upper surface of the ridge A.

[0013] FIGS. 1 and 5, when adjusting by the lifting mechanism 7 transplantation depth of seedlings pot N substantially constant state, detected and the height of the lower surface and the ridge A top surface of the vehicle body 1 , Rise
3 shows a lifting control device 33 for performing a descending control . The lifting / lowering control device 33 includes a rotating lever 34 that pivotally supports a base end of the traveling vehicle body 1 so as to be vertically rotatable, and a roller-shaped sensor that is rotatably attached to a free end of the rotating lever 34. Body 35 and rotating lever 3
A spring means 36 for buffering inserted between the longitudinal middle portion of the vehicle body 4 and the traveling vehicle body 1, and a hydraulic pressure switching rod 37 for the lifting / lowering hydraulic cylinder 19 in the switching valve unit 3 via the spring means 36. An operation link mechanism 38 for rotating the main body is a main component.

[0014] operating link mechanism 38 includes a longitudinal tip pivotally connected to the switching rod 37 lengthwise of the connecting rod 39, trims the rear end of the connecting rod 39, the vehicle body 1
And a lifting / lowering operation lever 4 having the bell crank lever 40 disposed on the side of the handle 8 or the like.
When the lifting operation lever 42 is rotated in the forward direction (arrow B direction) in FIG. 5, the traveling vehicle body 1 is at the maximum lowered position, and the rear body (arrow in FIG. 5). When the traveling vehicle body 1 rotates in the (C direction), the traveling vehicle body 1 is at the maximum raising position.

Further, the lower end of an elongating and lowering rod 45 which is vertically rotatable is mounted on a connecting bracket 44 which is rotatably supported by the rotating lever 34 so as to be rotatable only. The upper portion of the elevating rod 45 is slidably inserted into the through hole 47 of the upper support member 46 which is rotatably supported on the side surface. The bell crank lever 4
0 is provided with a torsion coil spring 60 that loosely fits on the support shaft 41 and urges the upper support 46 downward.

An upper end piece 48a of a regulating body 48 having a U-shape in side view is slidably fitted on the elevating rod 45, and the upper end piece 48a is arranged above the upper support body 46.
The female thread of the lower end piece 48b and the adjusting nut 49 are screwed into the thread formed on the lifting rod 45. Then, a coil spring 50 that is loosely fitted to the elevating rod 45 is interposed between the lower end piece 48 b of the regulating body 48 and the lower surface of the upper support 46.

Then, the lifting and lowering rod 45 is rotated, and
If the dimension of L at the location shown in is adjusted to be shorter, the seedling planting depth is increased. If the dimension of L is adjusted to be longer, fine adjustment is made in advance so as to reduce the seedling planting depth. Can be. The lower end of the lifting rod 45 is fixedly mounted on the connecting bracket 44, while an adjusting nut 49 is attached to the lower end piece 48 b of the regulating body 48 through which the lifting rod 45 is inserted.
Are rotatably brought into contact with each other, and the adjusting nut 49 is
The length of the L may be adjusted to be longer or shorter by adjusting the rotation with respect to the threaded portion of.

According to this configuration, the seedling planting depth is adjusted in advance as described above, and the left and right sides of the ridge A are wheels 5,6.
If the seedling pot N is supplied to the rotary pot 9 while the traveling vehicle body 1 is advanced along the ridge A while straddling the rotary pot 9, the rotary pot 9 is rotated horizontally, and the rotary pot 9 is rotated at predetermined time intervals. The lower lid of the pot portion at one position (the rear end in the traveling direction) is opened, the seedling pot N is received by the transplant opening device 11 at the raised position, the planting link 10 is lowered, the transplant opening device 11 is opened, and the ridge is opened. The seedling pot N is transplanted on the upper surface of A.

When the traveling vehicle body 1 moves forward, the sensor body 35 rolls forward on the upper surface of the ridge A while being pressed by the torsion coil spring 60. Then, when the height (H1) of the ridge A gradually increases, the sensor body 35 rises via the rotating lever 34, and the elevating rod 45 is pushed up, thereby compressing the coil spring 50 . Coil at this time
The bell crank lever 40 is rotated by the reaction force of the spring 50, and its movement is switched through the connecting rod 39.
7 is rotated so that the front and rear wheels 5 and 6 on both the left and right sides are simultaneously lowered by switching the hydraulic pressure feed direction of the switching valve unit 3 so that the vertical interval between the traveling vehicle body 1 and the upper surface of the ridge A is predetermined. When the height dimension becomes as described above, the switching valve is returned to the neutral position and controlled to maintain the height position. Conversely, when the ridge height H1 is reduced, the front and rear wheels 5 and 6 on both the left and right sides are simultaneously raised to bring the traveling vehicle body 1 closer to the ridge A and to control the vehicle body 1 to be maintained at a predetermined height.

When the unevenness on the upper surface of the ridge A is severe, the sensor body 35 is strongly pushed up while the traveling vehicle body 1 is moving forward. However, according to the spring means 36 of the present invention, the sensor body 35 responds to the severe pushing up. The elevating rod 45 moves upward through the through hole 47 of the upper support 46,
Is shortened due to elastic distortion, so that the bell crank lever 40 does not rotate significantly, and the switching valve unit 3
To give unreasonable power to the body.

[0021] Therefore, also the sensor body 35 is pushed up so excessive, without excessive force is exerted on the transmission member and the switching valve unit 3 in the elevator control device 33, a real failure of the elevator control device 33, a safety . As shown in FIGS. 1 and 8, standard seedling stands 51, 51 for mounting a large number of the seedling pots N on the left and right sides of the traveling vehicle body 1 are mounted on the left and right support arms 52, 52. In order to mount and further attach the spare seedling stand 53 detachably, a spare seedling stand arm 54 is detachably attached to the support arm 52, and the spare seedling stand supporting rod 55 is rotated left and right on the spare seedling arm 54. Possible and detachable mounting. The support arm 52 is supported by a support pipe 56 connected to the chassis, and the spare seedling stand arm 54 is connected to a reinforcement pipe 57 provided along the chassis. Reference numeral 61 denotes a shift lever projecting upward from the front of the rotary pot 9. By rotating the single shift lever 61, it is possible to execute a running speed shift and a setting for changing the planting stock interval of the seedling pot N. it can. That is, of the character-shaped guide grooves having a “width” in plan view in FIG. 2, when the guide groove is tilted toward the front left / right center (toward the front side of the traveling vehicle body), the reverse position, the middle position in the left / right center is the neutral position, The first side is the first gear position, the last position is the second gear position, the right side is the setting of a narrow range of the stock interval, and the left side is the setting of the wide range of the stock interval.

In the present invention, the sensor body 35 may have a roller shape or a sled shape. The present invention can be applied not only to a seedling transplanter but also to a management machine.

[0023]

According to the present invention, as described in detail above, according to the present invention, a rotating lever having wheels mounted on a traveling vehicle body so as to be able to move up and down, and a base end pivotally supported on the traveling vehicle body so as to be vertically rotatable. In
Attach a sensor body for ridge height detection that contacts the upper surface of the ridge,
To lift adjustment control wheels in response to vertical movement of the sensor body
In the walking type agricultural work machine configured to execute control of the hydraulic switching valve for the purpose, a spring means for buffering is inserted between the rotating lever and the traveling vehicle body, and through the spring means
It is configured to transmit a switching operation amount of the hydraulic switching valve.
When the unevenness of the normal ridge top surface is gentle,
Since the spring means presses the sensor body along the upper surface of the ridge, the ridge height can be accurately detected.

On the other hand, when the unevenness on the upper surface of the ridge is severe ,
Even if the sensor body is pushed up excessively, the spring means
Shrinks by a predetermined amount, and by the reaction force at one end of the spring means,
Since the switching operation of the hydraulic switching valve is performed, the sensor
The hydraulic pressure is determined by the amount of rotation of the rotation lever that is proportional to the amount of vertical movement of the body.
Since the by no executes switching operation of the switching valve, excessive force to each transmission member or the like in the elevator control <br/> device does not act, the elevation
This has the effect of avoiding damage to the control device and being safe.

[Brief description of the drawings]

FIG. 1 is a side view of an implanting machine.

FIG. 2 is a plan view of the transplanter.

FIG. 3 is a rear view of the transplanter.

FIG. 4 is an explanatory view of a mechanism of a lifting mechanism.

FIG. 5 is a side view of the elevation control device.

FIG. 6 is a side view of a main part of the spring means.

FIG. 7 is a view taken in the direction of arrows VII-VII in FIG. 6;

FIG. 8 is a perspective view of a spare seedling stand.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Running vehicle body 3 Switching valve unit 5, 5 Front wheel 6, 6 Rear wheel 7 Elevating mechanism 15a, 15b Swing case 19 Elevating hydraulic cylinder 26a, 26b Elevating link mechanism 33 Elevating control device 34 Rotating lever 35 Sensor body 36 Spring means 39 connecting rod 40 bell crank lever 42 elevating operation lever 43 connecting rod 44 connecting bracket 45 elevating rod 46 upper support 47 through hole 48 regulating body 49 adjusting nut 50 coil spring

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshinori Yoshida 197 Kume, Okayama City, Okayama Prefecture Ishikawajima Shibaura Machinery Co., Ltd.Okayama Plant (56) References JP-A-5-49313 (JP, A) JP-A-57-99114 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01C 11/02-11 / 02 303

Claims (1)

(57) [Scope of request for utility model registration] 1. A rotating lever having wheels mounted on a traveling vehicle body so as to be movable up and down, and a base end pivotally supported on the traveling vehicle so as to be vertically rotatable, has a ridge height detecting contact with the upper surface of the ridge. The walking type agricultural work machine configured to mount a sensor body and execute control of a hydraulic switching valve for controlling up and down movement of a wheel according to the vertical movement of the sensor body. A spring means for buffering is inserted between the lever and the traveling vehicle body, and the spring means
To transmit the switching operation amount of the hydraulic switching valve through
Lifting the walk-agricultural machine, characterized in that configuration the
Control device.