JP3346819B2 - Work vehicle ground work equipment lifting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ascending / descending structure of a ground working device in a working vehicle provided with a ground working device at a rear portion of a traveling body so as to be vertically movable by a driving mechanism.

[0002]

2. Description of the Related Art In a work vehicle provided with a ground working device at a rear portion of a traveling machine body so as to be vertically movable by a driving mechanism, the ground working device can be driven up and down to an arbitrary height by a driving mechanism, and is manually operated. Many have operating tools. This moves the lifting / lowering operating tool from the neutral position to the raised position (down position).
When the ground work device is started to be driven upward (downward drive) by the drive mechanism, and when the ground work device reaches a desired height, the lifting operation tool is operated from the raised position (down position) to the neutral position. The drive mechanism stops and the ground working device stops at the desired height.

[0003]

In a work vehicle, for example, when a work process at a work site is completed and the traveling machine reaches an end of the work site, the ground work device is raised by operating a lifting operation tool. Drive and operate the steering wheel to turn the traveling aircraft at the end of the work area. When the turning of the traveling body at the end of the work site is completed, the ground work device is driven down to the ground by operating the lifting / lowering operation tool, and the next work process is started. When the traveling aircraft reaches the end of the work place,
Raise the lifting operation tool from the lowering position and the neutral position to the raising position,
Quickly move from neutral position to neutral position
If you do not drive up to the desired height,
Operation of the aircraft at the end of the work area
Ground work equipment, especially for unskilled people
Lifting operation and other operations can be difficult
is there.

[0004] As described above, when the turning of the traveling body at the end of the work site is completed, and when the traveling work is started, if the position of the traveling aircraft is not appropriate (for example, the side of the previous work stroke). In a case where the traveling body is not adjacent to the traveling body and the traveling body is separated from the previous work step or overlaps with the previous work step), the traveling body may be stopped and moved backward. Thereafter, the traveling body is advanced while operating the steering wheel to correct the position of the traveling body, and the next work process is started.

[0005] As described above, when the traveling body is moved backward after the turning of the traveling body at the end of the work place is completed, the traveling body is moved backward while the ground working device is driven down to the ground. In this case, the ground work device is in a state of moving backward with the ground contacted, and there is a possibility that the ground work device may collide with a wall portion (for example, a ridge in a paddy field) at an end of the work site. May be damaged. According to the present invention, a ground working device is configured to be capable of driving a ground working device up and down to an arbitrary height by a driving mechanism based on an operation of a lifting operation tool, and the ground working device is driven down to the ground. It is an object of the present invention to prevent a state in which the traveling body is erroneously moved backward in the state and the ground work device is damaged.

[0006]

A feature of the present invention resides in the following structure in a structure for lifting and lowering a ground working device of a work vehicle.

[1] A driving mechanism is provided for driving a ground working device provided at a rear portion of the traveling body to move up and down, and the driving mechanism drives the ground working device to a predetermined height, and a driving mechanism. The lowering operation is performed to lower the ground work device until it touches the ground, and it is provided with a forcibly raising / lowering operation tool that is manually operated. When the traveling transmission is operated to the reverse position, the drive mechanism is forcibly applied. Reverse ascending means for ascending and descending operation, and
The lifting and lowering operation by operating the implement is allowed and
A first state in which the operation of the ascending / descending means is permitted;
The lifting and lowering operation by the operation of the operating tool is prevented and the
A second state in which the operation of the reverse climbing means is prevented can be set.
Elevation operation check means is provided .

[2 ] In the configuration of [1] above,
The setting change between the first state and the second state of the operation check means is performed
A lifting operation tool that can drive the ground work equipment up and down to any height
It is configured to be performed by selecting an operation position .

[0009]

According to the first aspect of the present invention, there is provided a reverse ascending means for forcibly operating the drive mechanism when the traveling transmission is operated to the reverse position.

[0010] With this, even if the operator erroneously operates the traveling transmission to the reverse position in a state where the ground work device is driven down to the ground, the ground work is automatically driven up. It is possible to avoid a situation in which the traveling machine is moved backward while the ground working device is driven down to the ground.

[II] According to the first aspect of the present invention, the first state in which the ascending and descending operation is allowed by the operation of the forcible raising / lowering operation tool and the operation of the reverse elevating means is allowed, and the ascending and descending operation by the operation of the forcible lifting / lowering operation tool And a second state in which the lowering operation is prevented and the reverse ascending means is prevented from operating.

In this way, when it is necessary to avoid the state in which the traveling body is moved backward while the ground working device is driven down to the ground as described in the above item [I], the ascending operation check means is required. , The first state may be set so that the operation of the reverse moving means is permitted. Conversely, for example, when storing a work vehicle in a barn or warehouse,
In some cases, an operation such as putting a work vehicle into a barn or a warehouse may be performed while the traveling machine body is moving backward while the ground work device is being driven to descend. In such a case, the second state may be set by the ascending operation restraining means so that the operation of the reverse ascending means is prevented. With this configuration, even if the traveling transmission is operated to the reverse position in a state where the ground work device is driven down, the ground work device is not forcibly driven up, so that the ground work device is driven down. In this state, the traveling body can be moved backward without any trouble.

[III] According to the first aspect of the present invention, there is provided a forcibly raising / lowering operation tool which is manually operated, and when the traveling body reaches an end of the work site in the work vehicle, for example, When the forcible lifting / lowering operating tool is operated, the ground working device is driven upward by the driving mechanism to a predetermined height set in advance. Thereafter, when the turning of the traveling body at the end of the work place is completed, if the operator operates the forcible lifting / lowering operation tool, the ground work apparatus is driven to descend until the ground work apparatus is grounded.

[0014] By simply operating the forcible lifting / lowering operation tool, the ground working device is raised to a predetermined height and the ground working device is lowered until it is grounded. The burden on the operator is reduced, and the operator can concentrate on other operations such as operating the steering handle.

[IV] As described in the above item [II],
According to the features of the first aspect, the first state in which the ascending and descending operation is allowed by the operation of the forcible elevating operation tool and the operation of the reverse elevating means is allowed, and the ascent and descent operation by the operation of the forcibly elevating operation tool are prevented. In addition, there is provided a lifting operation check means capable of setting a second state in which the operation of the reverse movement raising means is prevented.

[0016] Thus, as described in the above item [III] , in a work situation in which it is necessary to raise and lower the ground work device by operating the forcible lifting / lowering operation tool, the first state is set by the lifting operation check means. do it. Conversely, in a work situation in which it is necessary to drive the ground working device up and down to an arbitrary height by the drive mechanism, the second state may be set by the lifting operation check means. Thus, according to the feature of the first aspect, even if the forcible lifting / lowering operation tool is operated erroneously, the lifting / lowering operation of the ground operation device is not performed, and the ground mechanism can be arbitrarily operated by the drive mechanism based on the operation of the lifting / lowering operation device. Driving up and down to the height can be performed without any trouble.

[V] According to the features of claim 2, claim
As in the case of No. 1, the “action” described in the preceding items [I] to [IV] is provided.
It has. According to the features of claim 2, the lifting operation check
The setting change between the first state and the second state of the means is performed by the ground work equipment.
The operating position of the lifting / lowering operation tool that can drive the device to any height
Is configured to be performed by the selection.

According to the second aspect of the present invention,
For setting the first and second states of the lifting action check means
No special operation tool is required, and the ground working device can be
Use a lifting operation tool to drive the actuator to the height.
Can be.

[0019]

According to the first aspect of the present invention, when the transmission for traveling is operated to the reverse position, reverse drive means for forcibly operating the drive mechanism is provided, so that the ground working device can reach the ground. This makes it possible to avoid a situation in which the traveling body is moved backward in the state of being driven downward, thereby preventing damage to the ground working device and improving workability.

According to the first aspect of the present invention, by setting the second state by the lifting operation check means, the ground work device is forcibly driven up even if the traveling transmission is operated to the reverse position. The traveling machine can be moved backward without any trouble in the state where the ground work device is driven down, so that the workability can be improved, for example, when a work vehicle is stored in a barn or a warehouse. Was.

According to the first aspect of the present invention, only by operating the forcible lifting / lowering operation tool, the drive mechanism raises the ground work device to a predetermined height, and the drive mechanism grounds the ground work device. The configuration in which the lowering operation is performed reduces the burden on the operator and allows the operator to concentrate on other operations such as operation of the steering wheel. Was good.

According to the first aspect of the present invention, the ground working device can be raised and lowered by operating the forcible lifting / lowering operating device (first state), and the ground working device can be driven by the driving mechanism based on the operation of the lifting / lowering operating device. Can be selected according to the work situation, and the workability can be further improved.

According to the features of claim 2, the case of claim 1
Similarly to the above, the present invention has the above-mentioned "effect of the invention". In addition to this "effect of the invention", it has the following "effect of the invention". According to the features of claim 2 , ascending works
The setting change between the first state and the second state of the dynamic restraint means is performed on the ground.
Operation of the lifting / lowering operating tool that can drive the working device up and down to any height
It is configured to be performed by selecting the working position.
The use of the lifting / lowering operation tool enables the first and second states to be moved.
Instead of adopting a configuration with another operation tool dedicated to setting changes
Simplification of the structure and improvement of operability
Was completed .

[0024]

Embodiments will be described below with reference to the drawings. FIG.
Shows a riding rice transplanter. In the riding type rice transplanter, a seedling planting device 3 is connected to a rear portion of the riding type traveling body 1 via a link mechanism 2 via a link mechanism 2 so as to be capable of driving up and down by a lift cylinder 4 and rolling freely around a longitudinal axis. It is configured to plant seedlings on a mud surface while running the vehicle. The engine 5 is mounted on the front of the traveling aircraft 1
The power of the engine 5 is transmitted to the front wheels 8 and the rear wheels 9 via the belt-type continuously variable transmission 6 and the gear-type main transmission 7a of the transmission case 7, and the electric motor 10
The transmission system is configured such that power synchronized with the vehicle speed is transmitted to the seedling planting device 3 via the planting clutch 11 (see FIG. 1) that is turned on and off.

As shown in FIG. 5, the seedling placement device 3 comprises a seedling rest 12, which reciprocates sideways with a constant stroke in the horizontal direction.
A planting mechanism 13 for taking out seedlings one by one from the lower end of the seedling rest 12 and planting them on the mud surface, a plurality of grounding floats 14 for leveling while following the grounding on the muddy surface, provided on both the left and right sides of the seedling planting device 3 It is provided with a drawable marker 15 and the like that draw a travel index line in an unplanted area in accordance with the planting operation.

As shown in FIGS. 1 and 5, the drawing marker 15 is linked with a wire so as to be automatically stored in conjunction with the ascending drive of the seedling planting device 3, and is automatically locked in the stored state. (Not shown). A two-point switching type marker switch 18 is operated in accordance with an up / down switching operation of a marker operation lever 17 which is swingably operated below the steering handle 16, and the lock state of the lock mechanism is changed by the electromagnetic solenoid SL. The release operation is selectively performed, and the drawing marker 15 on the desired side is operated to the operating posture in accordance with the downward drive of the seedling planting apparatus 3. Marker switch 18
Is energized to return to the neutral state, and based on an operation in either direction, the corresponding electromagnetic solenoid SL is energized for a certain period of time, and the locked state of the lock mechanism is released.

As shown in FIG. 1 and FIG.
The lifting drive is configured to be manually operable based on the operation of a forward / backward swing type artificial lifting / lowering lever 20 disposed on the side of the driver's seat 19 of the aircraft control section. The operation position of the artificial elevating lever 20 is detected by a potentiometer type lever sensor 21, and the detected value of the lever sensor 21 is subjected to zone discrimination for each set level by a control device 22 having a microcomputer. The electromagnetic hydraulic control valve V for the lift cylinder 4 is operated so as to be in an operating state corresponding to.

When the artificial lifting lever 20 is moved to the "up position", the seedling planting device 3 is forcibly driven up to the maximum up position. The detection that the seedling planting device 3 has been driven up to the maximum ascending position is configured to be performed by the link mechanism 2 contacting the upper limit switch SW2 attached to the rear wheel fender 23. Artificial lifting lever 20
Is operated at the "neutral position", the seedling planting device 3 is maintained at the current level, and when the artificial elevating lever 20 is operated at the "down position", the seedling planting device 3 is driven downward until it touches the mud surface. You. When the artificial raising / lowering lever 20 is operated to the “planting position”, the seedling planting device 3 is driven down until it comes into contact with the mud surface, and the planting clutch 11 is operated by the electric motor 10 to set the planting work state. Is done.

As shown in FIGS. 1 and 5, a swing lever type lifting / lowering operation switch SW1 is provided below the steering handle 16. By operating the lifting / lowering operation switch SW1, the seedling planting device 3 is moved to the maximum. It is configured to be operable in an ascending operation in which the ascending drive is forcibly driven to the ascending position and in a descending state in which the seedling planting device 3 is driven to descend until it comes into contact with the mud surface.

As shown in FIG. 1, automatic raising and lowering control means A for operating the lift cylinder 4 so that the planting depth of the seedlings, in other words, the height of the mud surface of the seedling planting device 3 is kept constant. Is provided. Of the grounding floats 14 supported to be able to swing up and down around the horizontal axis X at the rear, a vertical swing caused by a change in the height of the mud surface is located above the front side of the grounding float 14 located at the center in the left and right direction. A potentiometer type float sensor 24 for detecting the amount of movement is provided, and the control device 22 controls the hydraulic control valve V of the lift cylinder 4 by the control device 22 so that the detection value of the float sensor 24 matches the set value of the potentiometer type sensitivity adjuster 25. Operated. The automatic lifting / lowering control means A operates only when the artificial lifting / lowering lever 20 is operated to the “planting position”, the “down position”, and the “automatic position” described later.

As shown in FIG. 1, there is provided a changeover switch 26 capable of changing the operation speed of the lift cylinder 4 in the automatic lifting and lowering control means A according to the work situation. When the changeover switch 26 is operated to “2”, the operation speed of the lift cylinder 4 is set to a standard value. Switch 26
Is operated to "1", the operating speed on the rising side of the lift cylinder 4 becomes faster than the standard value, and the operating speed on the descending side becomes slower than the standard value. When the changeover switch 26 is operated to “3”, the operation speed on the upside of the lift cylinder 4 becomes slower than the standard value, and the operation speed on the downside becomes faster than the standard value. In the normal planting operation state, the changeover switch 26 is operated to “2”, and when the additional weight of the seedling planting device 3 is increased by adding a separate work machine such as a chemical spraying device, the changeover switch 26 is changed. To "1". When it is desired to level the headland strongly, the changeover switch 26 is operated to “3”. The operation speed of the lift cylinder 4 is changed by changing and controlling the duty ratio of the pulse drive current to the hydraulic control valve V.

As shown in FIGS. 1 and 5, the main transmission 7
When the reverse detection switch 27 is turned on, the reverse detection switch 27 that is turned on when the reverse operation switch is turned on is provided. Reverse ascending means B forcibly ascending to the maximum ascending position detected by
The control device 22 is provided in the form of a control program.

The artificial raising / lowering lever 20 is configured to be operable to another “automatic position” different from the “elevating position”, “neutral position”, “lowering position” and “planting position”. Only when is operated to the "automatic position", the ascending and descending operation switch SW1 allows the ascending and descending operation, and the ascending operation checking means C which permits the operation of the reverse ascending means B is provided in the form of a control program. I have. FIG.
As shown in FIG. 5, of the series of operation paths of the artificial lifting lever 20, the artificial lifting lever 20 can be operated to the “automatic position” via the operation path extending laterally outward from the “neutral position”. Similarly, the operation of the artificial lifting lever 20 to the “automatic position” is configured to be determined by the control device 22 based on the zone determination of the detection value of the lever sensor 21.

As shown in FIGS. 2 and 3, when the control is started, the detection value of the lever sensor 21 is discriminated in the zone, and it is determined whether or not the artificial lifting lever 20 is operated to the "automatic position". (Step # 1), artificial lifting lever 20
Is operated to the "automatic position", when the reverse detection switch 27 is turned on, the seedling planting device 3 is forcibly driven up to the maximum ascending position and stopped (steps # 2 to # 4).
# 5).

Next, when the raising / lowering operation switch SW1 is operated, if the seedling planting device 3 is not at the maximum rising position, the seedling planting device 3 is driven up until it reaches the maximum rising position. If it is in the maximum ascending position, it is determined from the detection value of the float sensor 24 and until the ground float 14 is grounded.
The seedling planting apparatus 3 is driven downward (steps # 6 to # 1).
2). If the marker switch 18 is operated when the seedling planting apparatus 3 is driven downward, the planting clutch 11 is turned on and operated by the electric motor 10 to enter the automatic elevating control mode (steps # 13 to # 15). . When the artificial lifting lever 20 is operated to the "automatic position" as described above, the above-described control steps are repeated, and the lifting operation switch SW
The raising and lowering operation by the operation 1 is enabled.

Next, if the artificial elevating lever 20 is not operated to the "automatic position", the "neutral position", "elevated position",
The operation corresponding to the “down position” and the “planting position” is performed, and only when the artificial lifting lever 20 is operated to the “planting position”, the planting clutch 11 is engaged in conjunction with the operation of the marker switch 18. Operation becomes possible. Artificial lifting lever 2
If 0 is operated to the "down position" and the "planting position", the seedling planting device 3 is driven down until it comes into contact with the mud surface, and enters the automatic elevating control mode (steps # 16 to # 3).
1). As described above, the step # 1 constitutes the lifting operation restraining means C, and the steps # 2 to # 5 constitute the reverse climbing means B.

In the claims, the reference numerals are used to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a control system.

FIG. 2 is a diagram showing a flowchart of control.

FIG. 3 is a diagram showing a flowchart of control.

FIG. 4 is a plan view showing an operation path of an artificial lifting lever.

FIG. 5 is an overall side view of a riding rice transplanter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling body 3 Ground work device 4 Drive mechanism 7a Traveling transmission device 20 Elevating operation tool B Reverse elevating means C Elevating operation check means SW1 Forced elevating operation tool

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A01C 11/02 313-332 A01B 63/10

Claims (2)

(57) [Claims] A driving mechanism (4) for vertically moving a ground working device (3) provided at a rear portion of a traveling body (1) is provided. The driving mechanism (4) controls the ground working device (3) in advance. A lifting operation of driving the ground working device (3) down to the ground by the driving mechanism (4) is performed by the driving mechanism (4). When the traveling speed change device (7a) is operated to the reverse position with the lifting operation tool (SW1),
The apparatus includes a reverse ascending means (B) for forcibly operating the drive mechanism (4), and ascending and descending by operating the forcible lifting / lowering operation tool (SW1).
The descending operation is permitted and the operation of the reverse ascending means (B) is permitted.
The first state to be accommodated and the operation of the forcible lifting / lowering operating tool (SW1)
The lifting and lowering operations due to the
Configurable rise with second state preventing operation of stage (B)
A work vehicle lifting and lowering structure for a work vehicle provided with an operation restraint means (C) . 2. The first state and the second state of the ascending operation check means (C).
Change the setting between 2 and the ground work equipment (3) to any height
Selection of the operation position of the lifting operation tool (20) that can be driven up and down
2. The structure for lifting and lowering a ground vehicle working device according to claim 1, wherein the lifting device is configured to be selectively operated .