JPH08130943A - Lifting structure for working device against ground in working vehicle - Google Patents

Abstract

PURPOSE: To travel a machine body forward and backward without difficulty when the machine climbs over a high obstacle in a lifting structure for working device against the ground so constructed that when a worker operates a transmitting device for traveling in a backward mode, a working device against the ground is automatically raised and the machine body is traveled backward after the working device against the ground comes downward. CONSTITUTION: In this lifting structure for a working device against the ground in a working vehicle, a backward travel of a machine is inhibited and an actuator of a link mechanism 4 is operated in upward mode when a transmitting device is operated in a reverse travel mode, and the backward travel of the machine body is allowed when a grounding body 13 reaches the lowest limit of a preset range in accordance with rising of the link mechanism 4 (a working device 6 against the ground), and even in case when the link-mechanism reaches near the upper limit, the backward travel of the machine body is allowed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating structure for a ground work device in a working vehicle having a ground work device connected to a rear portion of a machine body so as to be vertically movable by a link mechanism and having an actuator for vertically moving the link mechanism.

[0002]

2. Description of the Related Art As an example of a work vehicle as described above, there is a riding type rice transplanter in which a seedling planting device (corresponding to a ground work device) is connected to a rear portion of a machine body so as to be vertically movable by a link mechanism and an actuator. In such a riding type rice transplanter, as disclosed in, for example, Japanese Patent Application Laid-Open No. 3-83503, when a gearshift lever (corresponding to a gearshift operation tool) of a traveling transmission is operated to a reverse side, a link is made by an actuator. There is one in which the mechanism is configured to be automatically lifted. This enables the seedling planting device to be installed on the rice field (ground).
It is possible to prevent the grounding body such as the float of the seedling planting device from being damaged by moving the aircraft backward while it is grounded.

In this case, if the backward movement of the aircraft and the raising of the seedling planting apparatus are started at substantially the same time, when the backward movement of the aircraft starts, the aircraft will go backward with the grounding body of the seedling planting apparatus grounded. It occurs temporarily. Therefore, taking advantage of the fact that a grounding body such as a float is supported so that it can be raised and lowered within the set range with respect to the seedling planting device, when the speed change lever is operated to the reverse side, the raising operation of the seedling planting device is performed first. When the grounding body of the seedling planting device is started and descends to the lower limit of the set range, it is determined that the seedling planting device has been completely lifted from the paddy field, and the reverse movement by the transmission for traveling is started. There is one configured.

[0004]

In the riding type rice transplanter having the above-mentioned structure, for example, when the rider crosses the ridge Z from the paddy field Y as shown in FIG. The planting device 6) is lifted up to near the upper limit of the lifting range to get over the ridge Z. in this case,
If the ridge Z is relatively high, the front wheel 1 rides on the ridge Z and the aircraft is in a forward rising posture, even if the link mechanism 4 (seedling planting device 6) is operated to move up to near the upper limit of the lifting range. , The grounding body 13 of the seedling planting device 6 is a field G (corresponding to the ground)
May be grounded (the grounding body 13 cannot descend to the lower limit of the setting range).

In such a state, the operator gives up overcoming the high ridge Z at this position, tries to move the machine body backward, and tries to get over the ridge Z from another position. When operated, the function of the above-mentioned conventional technique is activated, the link mechanism 4 is lifted (actually, the link mechanism 4 has already been lifted to the vicinity of the upper limit), and the seedling planting device 6 is grounded. When the body 13 descends to the lower limit of the set range, the reverse drive is started. However, as shown in FIG. 6, if the grounding body 13 of the seedling planting device 6 is grounded on the rice field G with the front wheel 1 riding on the ridge Z,
Since the grounding body 13 cannot descend to the lower limit of the set range, it cannot move backward, and the aircraft cannot move forward or backward. It is an object of the present invention to eliminate the above-mentioned problems when overcoming relatively high obstacles in a ground work device lifting structure for a work vehicle configured such that the ground work device is automatically lifted during reverse travel. There is.

[0006]

The feature of the present invention resides in that the above structure for raising and lowering the ground work device for a work vehicle is constructed as follows. That is, the ground work device is connected to the rear part of the machine body by a link mechanism so as to be able to move up and down, and an actuator that drives the link mechanism to move up and down is provided. , When the gear shift operation device that artificially shifts the transmission for traveling is operated to the reverse side, the backward transmission of the vehicle is restrained from being restrained by the transmission for traveling, and the actuator is operated to operate in the upward direction. Means for moving the ground work device to the lower limit of the setting range by the ascending of the ground work device by the forcible lifting device, and allowing the backward movement of the machine body by the traveling speed change device by operating the speed change operation tool toward the reverse direction. When the reverse allowance means and the link mechanism reach the vicinity of the upper limit of the ascending / descending range, the reverse operation of the machine is allowed by the speed change device for traveling by operating the speed change operation tool to the reverse side. It is a second reverse tolerance means.

[0007]

With the construction of the present invention, for example, as shown in FIG. 6, when the body is advanced to try to get over an obstacle,
It is assumed that an operator gives up overcoming a high obstacle at this position, operates the speed change operation tool for traveling to the reverse side in order to move the aircraft backward and try to get over the obstacle from another position. In this case, the backward movement of the body is restrained by the forcible ascending means, and the actuator causes the link mechanism 4 (ground work device 6)
Is operated to the ascending side of (is sometimes already operated to the ascending side).

In the state where the speed change operation tool is operated to the reverse side as described above, even if the front wheel 1 rides on the obstacle and the body is in the forward rising posture as shown in FIG. If the grounding body 13 of the ground work device 6 has reached the lower limit of the setting range without being grounded to G, the first reverse travel permitting means causes the machine body to start moving backward without any trouble. You can move it to the position.

On the contrary, in the state where the speed change operation tool is operated to the reverse side as described above, as shown in FIG.
It is assumed that the ground work device 6 is in contact with the ground G and the grounding body 13 of the ground work device 6 cannot descend to the lower limit of the set range. Even in such a case, according to the configuration of the present invention, if the link mechanism 4 is operated to the upper limit vicinity by the forcible lifting means when the link mechanism 4 operates the gear shift operating device to the reverse side, The link mechanism 4 is operated by operating another operation lever or the like after operating the speed change operation tool to the reverse side.
By raising the (ground work device 6) to near the upper limit,
The second reverse allowance means causes the aircraft to start moving backward,
After this, the aircraft may be moved to the position of another obstacle.

For example, when the link mechanism 4 (ground work device 6) is lifted up by operating the speed change operation tool for traveling to the reverse side in a normal flat work place as shown in FIG.
When the grounding body 13 of the ground work device 6 does not descend due to the trapping of soil or the like, the aircraft does not move backward due to the first reverse advancing means, but in this state, the link mechanism 4 (ground work device 6) rises to around the upper limit. When operated, the second reverse admission means causes the aircraft to start moving backward without any trouble.

[0011]

As described above, in the ground work device lifting structure for a work vehicle constructed so that the ground work device is automatically lifted when the gear shift operation device is operated to the reverse side, when a high obstacle is climbed over. As a result, the aircraft can be moved backward and forward without any trouble, and the workability and traveling of the work vehicle can be improved. In addition, even when the gear shifting operation tool for traveling is operated to the reverse side in a normal flat work site, even if the grounding body of the ground work device does not descend due to the raising operation of the ground work device, the upper limit of the link mechanism is set. Since the backward movement of the machine body can be performed without any trouble by performing the raising operation to the vicinity, the workability of the work vehicle can be improved also in this aspect.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a control unit 3 is formed on a body supported by front wheels 1 and rear wheels 2, and a link mechanism 4 is provided on a rear portion of the body.
Is equipped with a hydraulic cylinder 5 (corresponding to an actuator) that drives the link mechanism 4 to move up and down, and a seedling planting device 6 (corresponding to a ground work device) is connected to the rear portion of the link mechanism 4 to form a work vehicle. An example of a riding type rice transplanter is configured.

As shown in FIGS. 2 and 1, a control valve 7 for supplying and discharging hydraulic oil to and from the hydraulic cylinder 5 to operate it, a planting clutch 8 for transmitting power to the seedling planting device 6, and A motor 9 for turning on and off the planting clutch 8 is provided. An operating lever 10 for the hydraulic cylinder 5 and the planting clutch 8 is provided in the control section 3 of the machine body, and the operating position of the operating lever 10 is input to the control device 11.

When the operating lever 10 is operated along the lever guide 12 shown in FIG. 3 to the raised position, the neutral position and the lowered position, the control valve 7 is operated by the motor 9 while the planting clutch 8 is disengaged. Is operated to the supply position, the neutral position and the discharge position, and the seedling planting device 6 is operated to be raised, stopped and lowered by the hydraulic cylinder 5. When the operation lever 10 is operated to the planting position of the lever guide 12, the planting clutch 8 is operated by the motor 9 so that the seedling planting device 6 is maintained at the set height from the rice field G (corresponding to the ground). First, the control valve 7 is operated, the hydraulic cylinder 5 is expanded and contracted, and the seedling planting device 6 is automatically moved up and down, which is a normal planting state.

As shown in FIGS. 2 and 1, the seedling planting device 6
Sensor float 13 around the horizontal axis P1 in the left and right center of
(Corresponding to a grounding body) is supported by a mechanical stopper or the like so as to be movable up and down within a set range, and a potentiometer 14 for detecting the vertical angle of the sensor float 13 with respect to the seedling planting device 6 is provided. Thus, at the planting position of the operation lever 10, the height of the seedling planting device 6 with respect to the sensor float 13 that follows the ground contact with the rice field G is detected by the potentiometer 14 as the vertical angle of the sensor float 13 and input to the control device 11. The control valve 7 is operated by the control device 11 based on the detection value of the potentiometer 14.

As shown in FIG. 2, in this riding type rice transplanter,
It is equipped with a hydrostatic continuously variable transmission 15 (corresponding to a traveling transmission) for traveling. Hydrostatic stepless transmission 1
5 is configured to be capable of stepless speed change operation between the forward drive side F and the reverse drive side R with the neutral stop position N interposed therebetween. The electric cylinder 16 and the electric cylinder 16 which perform the speed change operation of the hydrostatic stepless transmission 15. Potentiometer 17 for detecting expansion / contraction position
Is provided.

2 to the right of the steering handle 18 shown in FIG.
As shown in FIG. 3, a shift lever 19 (corresponding to a shift operation tool) that can be operated on the forward side F and the reverse side R across the neutral stop position N is provided, and the operation position of the shift lever 19 and the detection of the potentiometer 17 are provided. The value is input to the control device 11. As a result, when the shift lever 19 is operated, the control device 11 and the electric cylinder 16 shift the hydrostatic continuously variable transmission 15 so that the shift position corresponds to the operation position of the shift lever 19.

A case in which the lever guide 12 of the operation lever 10 is provided with an automatic position as shown in FIG. 3 and the operation lever 10 is then operated to the automatic position will be described with reference to FIGS. 4 and 5. To do. When the operation lever 10 is operated to the automatic position, the planting clutch 8 is operated and operated in the same manner as when the operating lever 10 is operated to the planting position described above, and the seedling planting device 6 is set at a set height from the rice field G. The seedling planting device 6 is automatically moved up and down so as to be maintained at.

As shown in FIG. 2, a lever type elevating switch 20 is provided on the right side of the control handle 18, and the elevating switch 20 is operated when the operating lever 10 is operated to the automatic position (step S1). Is operated once (step S2), and if the seedling planting device 6 is being lowered (step S3), the planting clutch 8 is disengaged by the motor 9, and the hydraulic cylinder 5 causes the seedling planting device 6 to reach its upper limit. Is operated up to (step S4).

On the contrary, when the raising / lowering switch 20 is operated, the seedling planting device 6 is moved upward (steps S2, S).
3) The seedling planting device 6 is moved down to the rice field G by the hydraulic cylinder 5 (step S6). In this case, if the marker 21 shown in FIG. 1 is selected, the planting clutch 8 is operated by the motor 9 and the seedling planting device 6 is lowered to the rice field G (step S6). The raising / lowering operation of the seedling planting device 6 by the raising / lowering switch 20 is as follows.
This is done when turning around the ridge in the planted state.

Next, when the operation lever 10 is operated to the automatic position (step S1), the speed change lever 19
Is operated from the forward drive side F or the neutral stop position N to the reverse drive side R (step S7), the hydrostatic stepless transmission 15 is not shifted to the reverse drive side R and is held at the neutral stop position N by the electric cylinder 16. (Step S8). Next, the planting clutch 8 is disengaged by the motor 9 (step S
9), the hydraulic cylinder 7 by the control device 11 and the control valve 7.
Is extended and the seedling planting device 6 is raised from the rice field G (step S10) (corresponding to the forced raising means).

When the seedling planting device 6 is operated to rise as described above, the sensor float 13 descends to the lower limit of the set range due to its own weight or the like. Thereby, when the seedling planting device 6 is operated to be raised (step S10) and the detection value A corresponding to the lower limit is input from the potentiometer 14 to the control device 11 (step S11), the rice seedling planting device 6 is operated from the rice field G. Is determined to have been completely lifted, and the hydrostatic continuously variable transmission 15 is shifted by the control device 11 and the electric cylinder 16 to the shift position corresponding to the operation position on the reverse side R of the shift lever 19. Yes, this causes the machine body to start moving backward (step S13) (corresponding to the first backward moving permitting means).

As shown in FIG. 2, at the base of the link mechanism 4,
A potentiometer 22 for detecting the vertical angle of the link mechanism 4 with respect to the machine body is provided. As a result, soil or the like is caught in the support portion of the sensor float 13 and even if the sensor float 13 cannot descend to the lower limit of the set range (the detection value A corresponding to the lower limit is input to the controller 11 from the potentiometer 14). Even if not performed), when the potentiometer 22 detects that the link mechanism 4 has reached the upper limit (step S12), the control device 11 and the electric cylinder 16 shift the hydrostatic continuously variable transmission 15. As a result, the vehicle body starts to move backward (step S13) (corresponding to the second backward movement permitting means).

As described above, when the operation lever 10 is operated to the automatic position, when the speed change lever 19 is operated to the reverse side R, the seedling planting device 6 is automatically lifted. When the operation lever 10 is operated to the automatic position, the raising / lowering switch 20 can raise the seedling planting device 6 (steps S2, S3, S4), but the speed change lever 19 is operated to the reverse side R. If so, the descending operation of the seedling planting device 6 by the elevating switch 20 cannot be performed (steps S2, S
3, S5). In this way, when the operation lever 10 is operated to the automatic position and the shift lever 19 is operated to the reverse side R, the raising / lowering switch 20 cannot lower the seedling planting device 6, but the shift lever 19 Even when operating the rearward side R, by operating the operating lever 10 from the automatic position of the lever guide 12 in FIG. 3 to the lowered position, the neutral position and the raised position, the descending and raising operations of the seedling planting device 6 can be performed. It can be performed (steps S1, S15, S16, S17).

Next, a case will be described in which, when the operating lever 10 is operated to the automatic position, as shown in FIG.
As described above, when the operation lever 10 is operated to the automatic position, the raising / lowering switch 20 raises / lowers the seedling planting device 6, so when the ridge Z is crossed as shown in FIG. Operate the lift switch 20 to operate the seedling planting device 6
Is raised (steps S2, S3, S4). Next, the shift lever 19 is operated to the forward side F (step S
7) The aircraft is moved forward (step S14) to get over the ridge Z.

In this state, it is assumed that the operator gives up over the high ridge Z at this position, operates the speed change lever 19 to the reverse side R in order to move the aircraft backward and try to get over the ridge Z from another position. (Step S7). In this case, after the hydrostatic stepless transmission 15 is held at the neutral stop position N, the planting clutch 8 is disengaged to raise the seedling planting device 6 (steps S8, S9). , S1
0) At the time when the elevating switch 20 is operated, the planting clutch 8 has already been disengaged and the seedling planting device 6 has been raised (steps S2, S3, S4).

In the state where the speed change lever 19 is operated to the reverse side R as described above, even if the front wheel 1 rides on the ridge Z as shown in FIG.
The seedling planting device 6 does not ground to the rice field G and the sensor float 1
If 3 has reached the lower limit of the setting range (step S1
1) However, the operation proceeds to step S13 without any trouble, and the vehicle body starts to move backward (corresponding to the first backward movement permitting means). After that, the vehicle body may be moved to another position of the ridge Z.

On the contrary, in the state where the speed change lever 19 is operated to the reverse side R as described above, when the front wheel 1 rides on the ridge Z as shown in FIG. If the planting device 6 is in contact with the rice field G and the sensor float 13 cannot descend to the lower limit of the set range, as described above, steps S11 to S13.
Can not move to. However, even in such a case, since the link mechanism 4 (seedling planting device 6) has already been lifted to the vicinity of the upper limit when the elevating switch 20 is operated (steps S2, S3, S4), from step S12. Since the process proceeds to step S13, the vehicle body starts to move backward (corresponding to the second backward movement permitting means), and after that, the vehicle body may be moved to another position of the ridge Z.

[Other Embodiments] The present invention can be applied not only to a riding type rice transplanter, but also to an agricultural tractor in which a rotary tiller (corresponding to a ground working device) is connected to a rear portion of a machine body by a link mechanism so as to be vertically movable. In this case, the rotary cover for lifting control, which is supported on the rear part of the rotary tiller so as to be vertically swingable, may be used as the grounding body of the present invention.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Fig. 1] Overall side view of the riding rice transplanter

FIG. 2 is a diagram showing a linked state of a speed change lever, an operation lever, a hydraulic cylinder for driving the seedling planting device up and down, a hydrostatic stepless speed change device, and the like.

FIG. 3 is a plan view of a lever guide of an operation lever.

FIG. 4 is a diagram showing a flow of the first half of control when operating the shift lever to the reverse side.

FIG. 5 is a diagram showing a flow of the latter half of the control when the shift lever is operated to the reverse side.

FIG. 6 is a side view showing a state in which the riding rice transplanter gets over a high ridge.

[Explanation of symbols]

 4 Link mechanism 5 Actuator 6 Ground work device 13 Grounding body 15 Gearbox for traveling 19 Gearshift operation tool R Reverse gearshift operation tool G Ground

Claims (1)

[Claims] 1. A ground work device (6) is connected to a rear part of a machine body so as to be vertically movable by a link mechanism (4), and an actuator (5) for vertically moving the link mechanism (4) is provided,
A grounding body (13) grounded on the ground (G) is provided in the ground work device (6) so as to be able to move up and down within a set range, and a speed change operation tool (manually speed-changes the travel speed changer (15) ( When 19) is operated to the reverse side (R), a forcible raising means for preventing the backward movement of the vehicle body by the traveling transmission (15) is restrained and for operating the actuator (5) to the upward side. When the grounding body (13) reaches the lower limit of the set range due to the lifting of the ground work device (6) by the forcible lifting means, the shift operation tool (19) is operated to the reverse side (R). When the first reverse advancing means for allowing the vehicle to move backward by the traveling transmission (15) and the link mechanism (4) near the upper limit of the ascending / descending range, the speed change operation tool (19) moves backward. By being operated on the side (R) Serial work vehicle ground work apparatus lifting structure that is a second reverse permitting means permitting the reverse of aircraft by the transmission (15) for traveling.