JP2013201920A - Paddy field working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute, in a paddy field working machine, so that positional relation between a manual operation system and an automatic operation system is set up in good accuracy.SOLUTION: A lift lever 29 for artificially operating a control valve 38 is equipped swingably. Link members 40, 41 swingable by transmitting the motion of a height sensor 11 through a link mechanism 25 are equipped and the control valve 38 is operated by mechanically transmitting the swinging motion of the link members 40, 41 to the control valve 38 to constitute so as to maintain the paddy field working device at a predetermined height from the ground surface G of the paddy field. The lift lever 29 and the link members 40, 41 are supported to be swingable around the same lateral supporting point 24a equipped to the machine body.

Description

  The present invention relates to a riding type paddy field work machine such as a riding type rice transplanter or a riding type direct seeding machine.

A riding type rice transplanter, which is an example of a paddy field work machine, has a configuration as disclosed in Patent Document 1.
In Patent Document 1, a seed float planting device (corresponding to a paddy field working device) is provided on the machine body so as to be movable up and down, and a center float that detects the height of the seed plant planting device from the surface (S ( 21)) (equivalent to a height sensor) is provided in the seedling planting device so as to be movable up and down. The airframe is provided with a hydraulic cylinder for raising and lowering the seedling planting device, and a control valve (50 in FIG. 8 of Patent Document 1) for operating the hydraulic cylinder by supplying and discharging hydraulic oil to the hydraulic cylinder is provided for the airframe. It has been.

  An operation lever (52 in FIG. 8 of Patent Document 1) is fixed to the operation shaft of the control valve (51 in FIG. 8 of Patent Document 1), and a sensing lever (53 in FIG. 8 of Patent Document 1) is fixed to the operation shaft of the control valve. Are fitted in a relatively swingable manner and extended downward, and a pin (72 in FIG. 8 of Patent Document 1) of the sensing lever is in contact with the operation lever. A wire (43 in FIG. 8 of Patent Document 1) (corresponding to the linkage mechanism) is connected across the center float and the sensing lever.

  As a result, when the seedling planting device moves up and down (based on the vertical movement of the fuselage) with respect to the center float that touches the ground, the center float moves up and down with respect to the seedling planting device. The operation of the float is transmitted from the wire to the control valve via the sensing lever and the operation lever, and the seedling planting device is controlled by the control valve and the hydraulic cylinder so that the seedling planting device is maintained at the set height from the rice field. Is raised and lowered, and the planting depth of the seedling by the seedling planting device is maintained at the set depth (the automatic operation system).

  In Patent Document 1, the elevating lever (54 in FIG. 8 of Patent Document 1) is swingably supported at a position (C in FIG. 8 of Patent Document 1) different from the sensing lever and the operating lever. A pin (56 in FIG. 8 of Patent Document 1) is in contact with the operation lever. By operating the elevating lever, the control valve can be operated to the raised position, the neutral position, and the lowered position via the operation lever (the manual operation system).

Japanese Patent Laid-Open No. 11-313515 (see FIGS. 8 and 9)

  In Patent Document 1, an elevating lever that is a manual operation system operated by a driver and a sensing lever that is an automatic operation system linked to a center float are swingably supported at positions slightly apart from each other. The operation system (elevating lever) and the automatic operation system (sensing lever) are configured to operate the control valve, which is a common operation target. As a result, if the positional relationship between the manual operation system and the automatic operation system is not accurately set, it is considered that the control valve cannot be appropriately operated by the manual operation system or the automatic operation system.

For example, when a manual operation system and an automatic operation system are used (combined) across multiple models with different specifications, the shape (position) of the body frame that supports the manual operation system and the automatic operation system is different for models with different specifications. Therefore, in each model with different specifications, it may be difficult to accurately set the positional relationship between the manual operation system and the automatic operation system described above, and there is room for improvement.
It is an object of the present invention to configure a paddy field work machine so that the positional relationship between a manual operation system and an automatic operation system is set with high accuracy.

[I]
(Constitution)
The first feature of the present invention resides in the following configuration in a paddy field work machine.
The paddy field work device is equipped with a paddy field work device so that the paddy field work device can freely move up and down, and the paddy field work device is equipped with a height sensor that detects the height of the paddy field work device from the paddy surface while following the ground.
The machine body includes a hydraulic cylinder for raising and lowering the paddy field working device, and a control valve for operating and operating the hydraulic cylinder by supplying and discharging hydraulic oil to and from the hydraulic cylinder.
Elevating lever for artificially operating the control valve is swingably provided,
A link member that swings when the operation of the height sensor is transmitted through a link mechanism, and the control valve is configured to mechanically transmit the swing operation of the link member to the control valve; Is configured such that the paddy field work device is lifted and lowered so that the paddy field work apparatus is maintained at a set height from the surface of the paddy field.
The elevating lever and the linking member are swingably supported around the same side fulcrum provided in the machine body.

(Operation and effect of the invention)
According to the first aspect of the present invention, when the lifting lever as the manual operation system and the linkage member as the automatic operation system are provided, the lifting lever as the manual operation system and the linkage member as the automatic operation system are the same. Since it is swingably supported around a (common) side fulcrum, compared to the case where the manual operation system (lifting lever) and the automatic operation system (linkage member) are arranged at separate positions. The positional relationship between the manual operation system (lifting lever) and the automatic operation system (linking member) is set with high accuracy.

Thereby, the operation of the control valve by the manual operation system (elevating lever) and the automatic operation system (linking member) can be appropriately performed, and the elevating performance of the paddy field work device in the paddy field work machine can be improved.
When using manual operation system (elevating lever) and automatic operation system (linkage member) across multiple models with different specifications, manual operation system (elevating lever) and automatic operation system for models with different specifications The manual operation system (lifting lever) and automatic operation system (linkage member) swing around a common lateral fulcrum even if the shape (position) of the body frame that supports the (linkage member) is different. By being supported freely, the positional relationship between the manual operation system (elevating lever) and the automatic operation system (linking member) is set with high accuracy.

[II]
(Constitution)
The second feature of the present invention resides in the following configuration in the paddy field working machine of the first feature of the present invention.
By operating the linkage member with the lift lever, the control valve is configured to be artificially operable with the lift lever.

(Operation and effect of the invention)
According to the second feature of the present invention, a linkage mechanism such as a linkage rod is connected across the lift lever and the control valve, and the control member is operated by the lift lever instead of operating the control valve by the lift lever. Thus, the control valve is operated via the linkage member.
As a result, the linkage mechanism extending between the lifting lever and the control valve and the linkage mechanism extending between the linkage member and the control valve can be configured in common, which is advantageous in terms of simplification of the structure. .

[III]
(Constitution)
The third feature of the present invention resides in the following configuration in the paddy field working machine of the first or second feature of the present invention.
The linkage member includes an upper part extending upward from the fulcrum part and a lower part extending downward from the fulcrum part,
The linkage mechanism is connected to the upper portion of the linkage member, and the control valve is connected to the lower portion of the linkage member.

(Operation and effect of the invention)
According to the third feature of the present invention, in the automatic operation system (linkage member), the link mechanism extending between the height sensor and the link member (upper portion) is arranged on the upper side, and the control valve and the link member (lower portion) A connection part will be arrange | positioned below and both are arrange | positioned mutually apart.
As a result, the linkage mechanism extending over the height sensor and the linkage member (upper portion), and the connecting portion between the control valve and the linkage member (lower portion) can operate smoothly without interfering with each other. As a result, the lifting performance of the paddy field work device in the paddy field machine could be improved.

[IV]
(Constitution)
According to a fourth aspect of the present invention, in any one of the paddy field working machines according to the first to third aspects of the present invention, there is a configuration as follows.
An engaged member that swings integrally with the elevating lever, an engagement arm that engages with the engaged member and can hold the elevating lever in a predetermined operation position, and the engagement arm A detent mechanism capable of holding the elevating lever in a predetermined operation position.
The engagement arm is supported swingably around a horizontal axis at a position different from the fulcrum portion, and extends vertically, and the engagement arm swings around the horizontal axis, thereby An engaging arm is configured to engage and disengage from the engaged member.

(Operation and effect of the invention)
Detent mechanism that can hold the lifting lever at a predetermined operating position (engaged member that swings integrally with the lifting lever, engages with the engaged member, and moves the lifting lever at a predetermined operation position) It is often provided with an engagement arm that can be held in position, and a spring that biases the engagement arm toward the engagement side with respect to the engaged member. In this case, if the driver operates the elevating lever, the elevating lever can be operated to another operation position against the spring.

  In this case, if a relatively long engagement arm is extended in the lateral direction, if mud, water or the like adheres to the engagement arm, mud, water or the like tends to stay in the engagement arm. On the other hand, according to the fourth feature of the present invention, since the relatively long engagement arm is extended in the vertical direction, even if mud, water or the like adheres to the engagement arm, mud from the engagement arm. It is easy for water and water to fall down, and mud and water do not easily stay in the engaging arm, and malfunction of the detent mechanism due to mud and water remaining in the engaging arm can be prevented.

[V]
(Constitution)
The fifth feature of the present invention resides in the following configuration in the paddy field working machine of the fourth feature of the present invention.
The engagement arm is disposed on the front side of the machine body with respect to the fulcrum portion.

(Operation and effect of the invention)
The paddy field work machine is configured so that the paddy field work device ascends from the paddy surface by mechanically operating the lift lever to the lift position as the machine body moves backward (operation to the reverse side of the travel shift lever). Sometimes.
In this case, in the detent mechanism, the traveling speed change lever and the engagement arm are mechanically linked by a rod, a wire, or the like, so that the forward movement of the vehicle (operation of the traveling speed change lever to the reverse side) causes the engagement. The combination arm is operated so as to be separated from the engaged member so that the elevating lever is easily operated to the raised position.

  According to the fifth aspect of the present invention, the engagement arm is disposed on the front side of the machine body with respect to the fulcrum, and the traveling shift lever located on the front side of the elevating lever and the engagement arm are mechanically linked. This has become advantageous in terms of simplification of the structure.

[VI]
(Constitution)
According to a sixth aspect of the present invention, any one of the first to fifth paddy field machines according to the present invention is configured as follows.
An operation rod installed across the paddy field work device side, the lifting lever and the control valve side, and the paddy field work device ascending the operation rod when the lifting lever is operated to the raised position. A pulling operation unit for pulling operation to the working device side;
The paddy field work is mechanically transmitted to the lift lever and the control valve via the pull operation part and the operation rod, as the lifting operation of the paddy field working device due to the lift lever being operated to the raised position. When the apparatus exceeds a set height, the lifting lever and the control valve are configured to be operated to a neutral position.

(Operation and effect of the invention)
When the lifting / lowering lever is moved to the raised position and the paddy field working device is lifted, the paddy field working device approaches the mechanical upper limit position when the paddy field working device rises above the set height, so that the paddy field working device moves up. Is mechanically transmitted to the elevating lever and the control valve, and the elevating lever and the control valve are operated to the neutral position to stop the paddy field work apparatus.

  For example, when the paddy field work device is lifted by operating the lift lever to the raised position, the operation rod is pushed from the paddy field work device side to the lift lever and control valve side, and the lift lever and control valve are moved to the neutral position. If configured, the operating rod may be compressed and buckled, and it is considered that the lifting lever and the control valve are not properly operated to the neutral position.

  On the other hand, according to the sixth aspect of the present invention, when the paddy field work device is lifted by operating the lift lever to the raised position, the operation rod is pulled toward the paddy field work device, and the lift lever and the control valve Since the operation rod is operated to the neutral position, the operation rod is not compressed, and the elevating lever and the control valve are appropriately operated to the neutral position, thereby improving the operation reliability.

[VII]
(Constitution)
According to a seventh aspect of the present invention, in any one of the paddy field working machines according to the first to sixth aspects of the present invention, the seventh aspect is configured as follows.
A lifting operation mechanism for operating the lifting lever to the raised position as the aircraft moves backward is provided on the left and right center side of the aircraft with respect to the linkage member and the linkage mechanism.

(Operation and effect of the invention)
As described in the preceding item [V], when the ascending operation mechanism that mechanically operates the elevating lever to the ascending position in accordance with the backward movement of the airframe (operation of the traveling shift lever to the reverse side) is provided. According to the seventh feature of the present invention, since the ascending operation mechanism is provided on the left and right center side of the fuselage with respect to the associating member and the associating mechanism, the ascending operation mechanism can be operated without interfering with each other. It was possible to arrange it compactly.

It is a whole side view of a riding type rice transplanter. It is a whole top view of a riding type rice transplanter. It is a side view of the vicinity of a lift lever, a sensitivity lever, and a control valve. It is a top view of the vicinity of a lift lever, a sensitivity lever, and a control valve. It is a side view which shows the linkage state of a raising / lowering lever, a sensitivity lever, a control valve, a center float, a planting clutch, and a link mechanism. It is a side view of the supporting member which supports a raising / lowering lever and an upper and lower linkage arm. It is a top view of the vicinity of the upper link of a link mechanism. It is a side view of the vicinity of the upper link of a raising / lowering lever, a control valve, and a link mechanism showing a state where the raising / lowering lever and the control valve are operated to a neutral position when the seedling planting device reaches the upper limit position. 1st form of implementation of invention WHEREIN: When the seedling planting apparatus reaches an upper limit position, the side of the vicinity of the upper link of the raising / lowering lever, control valve, and link mechanism which shows the state by which a raising / lowering lever and a control valve are operated to a neutral position FIG. In the 2nd other form of implementation of invention, it is a side view of the vicinity of the lower link of a link mechanism, a bell crank, and an operating rod.

[1]
As shown in FIGS. 1 and 2, an engine 3 and a driving unit 4 are provided on an airframe supported by right and left front wheels 1 and right and left rear wheels 2 that can be steered right and left. A seedling planting device 6 (corresponding to a paddy field work device) is connected to the rear part of the machine body through a parallel quadruple link mechanism 5 so as to be movable up and down, and a hydraulic cylinder 7 for operating the link mechanism 5 up and down is provided. A riding type rice transplanter, which is an example of a riding type paddy field working machine, is configured.

  A hydraulic pump (not shown) is provided in the vicinity of the engine 3, and lubricating oil in a transmission case (not shown) at the front of the airframe is used as hydraulic fluid from the hydraulic pump via a hydraulic pipe (not shown). Then, it is supplied to a control valve 38, which will be described later, and is supplied from the control valve 38 to the hydraulic cylinder 7 via a hydraulic pipe (not shown). The hydraulic oil (return oil) from the hydraulic cylinder 7 is returned to the control valve 38 via a hydraulic pipe (not shown), and is returned from the control valve 38 to the transmission case via the hydraulic pipe (not shown).

  As shown in FIGS. 1 and 2, the seedling planting device 6 includes four planting transmission cases 8 and a pair of rotating cases 9 that are rotatably supported on the right and left of the rear portion of the planting transmission case 8. The rotating case 9 includes a pair of planting arms 10, a center float 11 (corresponding to a height sensor), a side float 12, a seedling table 13, and the like. As the seedling platform 13 is driven to reciprocate laterally to the left and right, the rotary case 9 is rotationally driven, and the planting arms 10 alternately take out seedlings from the lower part of the seedling platform 13 and plant them on the rice field G.

  As shown in FIGS. 1 and 3, right and left square pipe-shaped airframe frames 20 are arranged along the front-rear direction of the airframe. A vertical wall-shaped right and left support frame 21 is fixed to the rear of the right and left body frames 20, and a support frame 22 is fixed to the upper portions of the right and left support frames 21. A seat 18 is supported.

  As shown in FIGS. 1 and 3, square pipe-shaped right and left support frames 14 are fixed vertically at the rear ends of the right and left body frames 20, and the right (left) support frame is fixed. 21 and the right (left) support frame 14 are connected to the right and left support frames 15 in the form of square pipes in the front-rear direction. The right and left upper links 5a in the link mechanism 5 are supported so as to swing up and down around the horizontal axis P7 of the right and left support frames 14, and the right and left lower links 5b in the link mechanism 5 are The right and left airframe frames 20 are supported so as to be swingable up and down around the horizontal axis P8.

[2]
Next, a support structure for the lift lever 29 will be described.
As shown in FIGS. 3, 4, and 6, a flat plate-like support member 23 and a support member 24 configured by bending a flat plate material into a box shape are connected by welding to provide a triangular support in a side view. The member 32 is connected by welding to the front side of the body of the support members 23 and 24 (the right side in FIG. 3). The support member 32 is connected to the right lateral surface of the right support frame 21 by a bolt 35 so that the support member 32 is positioned on the front side of the body relative to the support members 23 and 24, and the support member 23 and the lever guide 34 are connected to the right side. The support frame 21 is connected to the right lateral surface of the support frame 21 by bolts 35 together.

  As shown in FIGS. 3, 4, 5, and 6, a boss portion 28 a is fixed to a round hole portion of a fan-shaped operation plate 28 (corresponding to an engaged member) in a side view, and a lateral fulcrum shaft is supported on the support member 24. 24a (corresponding to a fulcrum portion) is fixed, the boss portion 28a of the operation plate 28 is rotatably fitted on the fulcrum shaft 24a of the support member 24, and the operation plate 28 is lateral to the fulcrum shaft 24a of the support member 24. The shaft P1 is supported so as to be swingable. A square pipe-shaped support portion 28 d is fixed to the operation plate 28, and a lift lever 29 is supported by the support portion 28 d, and the lift lever 29 extends upward through the opening of the lever guide 34.

  As a result, as shown in FIGS. 3, 4, 5, 6, the elevating lever 29 and the operation plate 28 are integrally swingable around the fulcrum shaft 24 a (horizontal axis P <b> 1) of the support member 24 in the longitudinal direction of the machine body. It is supported. The elevating lever 29 is configured to be freely operated in an ascending position, a neutral position, a descending position, and a planting position. As shown in FIGS. 1 and 2, the elevating lever 29 is disposed on the right side of the driver seat 18. Yes.

As shown in FIGS. 3, 4, 5, and 6, around the horizontal axis P <b> 2 on the front side of the body of the support member 32 (located on the front side of the body (right side in FIG. 3) with respect to the fulcrum part 24 a of the support member 24). The engagement arm 30 extends downward in a swingable manner, and the engagement arm 30 is located on the front side of the machine body (right side in FIG. 3) with respect to the fulcrum part 24a of the support member 24. A spring 36 is connected to the lower part of the support member 24 on the rear side of the machine body and the lower part of the engagement arm 30, and the engagement arm 30 is moved to the rear side of the machine body (on the engagement side with the operation plate 28) by the spring 36. It is energized. The engagement arm 30 is configured by bending a plate material into a U-shaped cross section, and a roller 30 a is supported at an intermediate portion of the engagement arm 30.
In this case, the vertical relationship between the engagement arm 30 and the horizontal axis P2 is reversed, and the engagement arm 30 is supported around the horizontal axis P2 located on the lower side of the front side of the operation plate 28 so as to be swingable back and forth. And you may comprise so that it may extend upwards.

  As shown in FIGS. 5 and 6, three concave portions 28 b and one convex portion 28 c are formed in the lower portion of the operation plate 28, and the operation plate 28 enters the inside of the engagement arm 30 having a U-shaped cross section. However, the roller 30 a of the engagement arm 30 is in contact with the operation plate 28. When the roller 30a of the engagement arm 30 enters (engages with) the recess 28b of the operation plate 28, the elevating lever 29 is held in the neutral position, the lowered position, and the planting position. When the elevating lever 29 is operated against this holding action, the engagement arm 30 (roller 30a) comes out of the recess 28b of the operation plate 28 forward (to the right in FIG. 5) (disengagement). As described above, the detent mechanism is configured by including the operation plate 28, the engagement arm 30, and the spring 36.

  As shown in FIGS. 4 and 6, a support pin 23b is fixed to the upward projecting portion 23a of the support member 23, and an operation cylinder 37 (corresponding to a lifting operation mechanism) biased to the extension side is supported. While passing between the member 23 and the support member 24, the support pin 23 b of the support member 23 and the operation plate 28 are connected. Thereby, the elevating lever 29 and the operation plate 28 are urged to the raised position by the operation cylinder 37.

  In this case, since the engaging action between the roller 30a of the engaging arm 30 and the recess 28b of the operation plate 28 is set to be larger than the urging force of the operating cylinder 37, the elevating lever 29 is moved to the neutral position, In the state of operating to the lowered position and the planting position, the raising / lowering lever 29 is not operated to the raised position by the operation cylinder 37.

[3]
Next, the linkage structure of the control valve 38 for raising and lowering the seedling planting device 6, the planting clutch 44, and the lifting lever 29 will be described.
As shown in FIGS. 3, 4, 5 and 6, an upper linkage arm 40 having a U-shaped cross section around the fulcrum shaft 24 a (horizontal axis P <b> 1) of the support member 24 (corresponding to the linkage member and the upper portion of the linkage member). However, it is extended upward so that rocking is possible. Around the fulcrum shaft 24a (horizontal axis P1) of the support member 24, a lower linkage arm 41 (corresponding to the linkage member and the lower portion of the linkage member) having an L-shaped cross section extends downward in a swingable manner. The upper part of the lower linkage arm 41 is in contact with the rear side surface of the upper linkage arm 40 (the left side of the paper in FIGS. 4 and 6).

  As shown in FIGS. 3, 4, and 5, a support bracket 16 formed by bending a plate material is fixed to an intermediate portion of the right support frame 15, and a control valve 38 that supplies and discharges hydraulic oil to and from the hydraulic cylinder 7. Is fixed to the support bracket 16. The spool 38a of the control valve 38 protrudes to the front side of the machine body (the right side in FIG. 3), and is in the raised position (the hydraulic cylinder 7 is contracted to raise the seedling planting device 6), the neutral position and the lowered position (hydraulic cylinder 7). And the seedling planting device 6 descends), and the spool 38a of the control valve 38 is biased to the lowered position by a spring (not shown).

  As shown in FIGS. 3, 4, and 5, the operation arm 42 is swingably supported around the horizontal axis P <b> 3 of the support portion 38 b of the control valve 38, and the upper portion of the operation arm 42 is supported by the spool 38 a of the control valve 38. The connecting rod 43 is connected across the operating arm 42 and the lower connecting arm 41. In this case, the control valve 38 may be disposed on the front side of the machine body of the lower linkage arm 41 so that the lower linkage arm 41 directly contacts the spool 38a of the control valve 38.

  As shown in FIGS. 3 and 5, a planting clutch 44 that can transmit and shut off the power of the engine 3 to the seedling planting device 6 is provided at the front of the machine body. A bell crank 46 is swingably supported around a horizontal axis P4 at the lower part of the machine body, and a linkage rod 47 is connected between the bell crank 46 and the planting clutch 44. A spring 48 that biases the bell crank 46 is connected to the bell crank 46. A long hole 46 a is opened in the bell crank 46, and a linkage rod 49 is connected across the operation plate 28 and the long hole 46 a of the bell crank 46.

  The state shown in FIG. 5 is a state where the elevating lever 29 is operated to the neutral position. The upper and lower linkage arms 40 and 41 are about to swing in the clockwise direction in FIG. 5 by the spring that biases the spool 38a of the control valve 38 to the lowered position, whereas the lower linkage arm 41 is moved to the operation plate 28. In contact with the support portion 28d, the spool 38a of the control valve 38 is operated to the neutral position. Thereby, the hydraulic cylinder 7 is stopped and the raising / lowering of the seedling planting device 6 is stopped (a state in which automatic raising / lowering control described in [7] described later is stopped). In a state where the elevating lever 29 is operated to the neutral position, the planting clutch 44 is operated to the cutoff position by the spring 48.

[4]
Next, the case where the raising / lowering lever 29 is operated to the raising position, the lowering position, and the planting position will be described.
As shown in FIG. 5, when the elevating lever 29 is operated to the raised position, the lower linkage arm 41 is operated to the right side of the sheet of FIG. 5 by the support portion 28d of the operation plate 28, and the spool 38a of the control valve 38 is moved to the raised position. When operated, the hydraulic cylinder 7 is contracted and the seedling planting device 6 is raised. In this case, the automatic elevating control described in [6], which will be described later, is in a stopped state, and the bell crank 46 is not operated and the planting clutch 44 is operated to the shut-off position due to the interchange of the long hole 46a of the bell crank 46. Yes.

  As shown in FIG. 5, when the elevating lever 29 is operated to the lowered position, the support portion 28d of the operation plate 28 moves to the rear side of the machine body (left side in FIG. 5), and the spool 38a of the control valve 38 moves to the lowered position. Is operated, the hydraulic cylinder 7 is extended, and the seedling planting device 6 is lowered. In conjunction with this, the upper and lower linkage arms 40 and 41 swing in the clockwise direction in FIG. 5 and come into contact with the support portion 28d of the operation plate 28. In this case, the automatic elevation control described in [7], which will be described later, is in a stopped state, and the bell crank 46 is not operated and the planting clutch 44 is operated to the shut-off position due to the interchange of the long hole 46a of the bell crank 46. Yes.

  In the state where the seedling planting device 6 is located above the rice field G, the center float 11 is swung downward to the lower limit, so that the wire 25 (corresponding to the linkage mechanism) described later in [7] is used. The contact portion 25c is separated from the position shown in FIG. 5 with respect to the upper linkage arm 40 to the front side of the machine body (the right side in FIG. 5). As a result, the swinging of the upper and lower linkage arms 40 and 41 is not restricted by the contact portion 25c of the wire 25.

  As shown in FIG. 5, when the seedling planting device 6 is lowered and the center float 11 comes into contact with the surface G, the center float 11 is lifted, and the inner 25a of the wire 25 is pulled toward the rear side of the machine body, 25, the contact portion 25c contacts the upper linkage arm 40, the upper and lower linkage arms 40, 41 are returned to the state shown in FIG. 5, and the spool 38a of the control valve 38 is operated to the neutral position, so that the hydraulic cylinder 7 stops (the operation state of the automatic lifting control described in [7] described later).

  As shown in FIG. 5, when the elevating lever 29 is operated to the planting position, the linkage rod 49 reaches the end of the long hole 46a of the bell crank 46 in a state where the automatic elevating control operation state is maintained. 46 is swung counterclockwise in FIG. 5, and the planting clutch 44 is operated to the transmission position. As a result, as described in [1] above, the seedling platform 13 is reciprocally driven laterally to the left and right, the rotary case 9 is rotationally driven, and the planting arms 10 are alternately planted from the lower portion of the seedling platform 13. Is taken out and planted on the rice field G.

  As shown in FIGS. 3 and 4, a fulcrum pin 24b is fixed to the support member 24, and an operation lever 55 is supported around the horizontal axis P6 of the fulcrum pin 24b so as to be swingable in the longitudinal direction of the machine body. A lever 55 extends upward through the opening of the lever guide 34. An open / close valve (not shown) that can shut off the internal oil passage to the hydraulic cylinder 7 is built in the control valve 38, and a linkage rod 57 is connected across the operation arm 56 and the operation lever 55 of the open / close valve. Yes.

  As shown in FIGS. 3 and 4, the operation lever 55 is normally operated to the open position and the on-off valve is operated to the open position. For example, when raising the seedling planting device 6 to the upper limit position and holding it for a long time (when storing it in a barn or warehouse), the operation lever 55 is operated to the closed position and the on-off valve is operated to the closed position. Keep it.

[5]
Next, a description will be given of a structure in which when the raising / lowering lever 29 is in the raised position, the raising / lowering lever 29 and the control valve 38 are operated to the neutral position when the seedling planting device 6 reaches the upper limit position.
As shown in FIGS. 3, 5, and 7, an operation arm 19 (corresponding to a pulling operation portion) is fixed downward on the base portion of the upper link 5 a of the link mechanism 5, and a boss portion 19 a is a horizontal axis on the lower portion of the operation arm 19. It is supported so that it can swing up and down. The operation rod 17 is slidably inserted into the boss portion 19a of the operation arm 19 and extends forward of the machine body, and is connected to the operation plate 28. A washer 17a is attached to an end of the operation rod 17 on the rear side of the machine body. The spring 17b is externally fitted so as to contact the washer 17a.

  The state shown in FIG. 5 is a state where the seedling planting device 6 is lowered and the boss portion 19a of the operation arm 19 is separated from the spring 17b of the operation rod 17 toward the front side of the machine body. In this state, as shown in FIG. 8, when the raising / lowering lever 29 is operated to the raised position and the seedling planting device 6 is raised, the boss portion 19 a of the operation arm 19 moves to the rear side of the machine body and the spring of the operation rod 17 is moved. Approach 17b.

  As shown in FIG. 8, when the link mechanism 5 (the seedling planting device 6) exceeds the set height (slightly below the mechanical upper limit position of the link mechanism 5), the boss portion 19a of the operation arm 19 is operated. The rod 17 is brought into contact with the spring 17b, and the operation rod 17 is pulled to the rear side of the machine body (the seedling planting device 6 side). Thereby, the operation board 28 is operated to the neutral position, the elevating lever 29 and the control valve 38 are operated to the neutral position, and the seedling planting device 6 stops at the upper limit position. In this case, the length of the operation rod 17 may be set so that the seedling planting device 6 stops at a position slightly below the upper limit position.

[6]
Next, the linkage between the traveling shift lever 26 and the lift lever 29 will be described.
A hydrostatic continuously variable transmission (not shown) that is steplessly variable on the forward side and the reverse side for traveling is provided. As shown in FIGS. 2 and 5, the hydrostatic continuously variable transmission is provided. A shift lever 26 is provided on the left lateral side of the steering handle 27 to operate the forward and reverse sides. A wire 31 is connected across the transmission lever 26 and the engagement arm 30, and when the transmission lever 26 is operated to the reverse side, the wire 31 is pulled to the transmission lever 26 side.

  As a result, as shown in FIG. 5, when the speed change lever 26 is operated to the reverse side while the elevating lever 29 is operated to the neutral position, the lower position and the planting position, the wire 31 is pulled toward the speed change lever 26. When operated, the engagement arm 30 is swung to the front side of the machine body (the right side in FIG. 5), and the roller 30a of the engagement arm 30 moves away from the recess 28b of the operation plate 28.

Next, the lifting lever 29 is operated to the raised position by the operating cylinder 37, and the seedling planting device 6 is raised. When the seedling planting device 6 reaches the upper limit position, as described in [5] above, The raising / lowering lever 29 and the control valve 38 are operated to the neutral position by the linkage rod 17, and the seedling planting device 6 stops at the upper limit position.
In this case, as shown in FIGS. 4 and 6, the operation cylinder 37 is disposed between the support member 23 and the support member 24, and the upper and lower linkage arms 40 and 41 and the wire 25 are centered on the left and right sides of the machine body. It is located on the side (the upper side in FIG. 4).

[7]
Next, automatic elevation control will be described.
As shown in FIG. 5, the center float 11 and the side float 12 are supported so as to be swingable up and down around the horizontal axis P <b> 5 of the seedling planting device 6, and a vertically long linking member 33 is provided at the front portion of the center float 11. The elongated long hole 33 a is supported and opened in the linkage member 33. The pin 39a of the arm 39 fixed to the seedling planting device 6 is inserted into the elongated hole 33a of the linkage member 33, and the spring 45 is connected across the upper portion of the linkage member 33 and the pin 39a of the arm 39. The center float 11 is urged downward by the urging force of the spring 45.

  As shown in FIGS. 3, 4, and 5, the inner 25 a of the wire 25 is connected to the pin 39 a of the arm 39, and the outer 25 b of the wire 25 is fixed to the upper portion of the linkage member 33. The inner 25a of the wire 25 is slidably inserted into the upper opening of the upper linkage arm 40, the contact portion 25c is fixed to the end of the inner 25a of the wire 25, and the outer 25b of the wire 25 will be described later. It is fixed to the holding member 50 described in [8].

  As shown in FIG. 5, when the seedling planting device 6 moves up and down by the vertical movement of the machine body with respect to the center float 11 that follows the ground surface G, the center float 11 moves to the horizontal axis with respect to the seedling planting device 6. It will be in the state of swinging up and down around the core P5. Thus, the outer 25b of the wire 25 is moved up and down with respect to the inner 25a of the wire 25, and the inner 25a of the wire 25 is pushed and pulled.

  As shown in FIG. 5, the inner 25a of the wire 25 is pushed and pulled, and the contact portion 25c of the wire 25 and the spool 38a of the control valve 38 are biased to the lowered position by a spring (not shown). As a result, the upper and lower linking arms 40 and 41 are swung around the fulcrum shaft 24a (horizontal axis P1) of the support member 24. In this case, when the elevating lever 29 is operated to the lowered position or the planting position, the support portion 28d of the operation plate 28 is separated from the lower linkage arm 41 to the rear side of the machine body (left side in FIG. 5). The support portion 28d of the plate 28 does not restrict the swing of the upper and lower linkage arms 40 and 41.

  As a result, as shown in FIG. 5, the spool 38 a of the control valve 38 is operated to the raised and lowered positions, the hydraulic cylinder 7 is expanded and contracted, and the seedling planting device 6 is maintained at the set height from the rice field G. As described above (so that the planting depth of the seedling by the planting arm 10 is maintained at the set depth), the seedling planting device 6 automatically moves up and down (operation state of automatic lifting control).

[8]
Next, the support structure of the sensitivity lever 51 will be described.
As shown in FIGS. 3, 4, 5, and 6, a round hole is opened on the rear side of the body of the U-shaped support member 24 in plan view, and a vertically long slot 23 c extending downward is opened on the support member 23. Has been. The sensitivity bar 51 is formed by bending the round bar material, the base of the sensitivity lever 51 is inserted into the round holes and the long holes 23c of the support members 23 and 24, and the sensitivity lever 51 is inserted into the support members 23 and 24 in the longitudinal direction of the body. The spring 52 is connected across the upper part of the support member 23 and the base of the sensitivity lever 51.

  As shown in FIGS. 3, 4, and 5, the sensitivity lever 51 extends upward through the opening of the lever guide 34, and the sensitivity lever 51 is located on the right side of the driver seat 18 as shown in FIG. 2. Has been placed. The base of the sensitivity lever 51 is positioned at the upper end of the long hole 23c of the support member 23 by the biasing force of the spring 52, and the sensitivity lever 51 is biased to the lower side in FIG. 4 by the biasing force of the spring 52. The guide 34 is engaged with the engaging portion 24c.

  As shown in FIGS. 3, 4, and 5, since the round hole of the support member 24 is set to be slightly larger than the outer diameter of the base portion of the sensitivity lever 51, the sensitivity is determined by using the round hole of the support member 24 as a fulcrum. By operating the lever 51 against the spring 52 upward in FIG. 4 (the state where the base of the sensitivity lever 51 is located at the lower end of the long hole 23c of the support member 23), the sensitivity lever 51 is moved to the lever guide 34. It can be moved away from the engaging portion 24c in the longitudinal direction of the machine body. The sensitivity lever 51 can be held at a desired position by operating the sensitivity lever 51 downward in FIG. 4 to engage with the engaging portion 24c of the lever guide 34.

  As shown in FIGS. 3, 4, and 5, the positioning member 53 is fixed to the sensitivity lever 51, the holding member 50 is externally fitted to the sensitivity lever 51 so as to be relatively rotatable, and the outer 25 b of the wire 25 is fixed to the holding member 50. The sensitivity lever 51 is provided with a spring 54 that urges the holding member 50 counterclockwise in FIG. When the holding member 50 comes into contact with the bent portion 53 a of the positioning member 53 by the biasing force of the spring 54, the posture of the holding member 50 with respect to the sensitivity lever 51 is set.

[9]
Next, the operation of the sensitivity lever 51 will be described.
As shown in FIG. 5, when the sensitivity lever 51 is operated and held on the insensitive side, the length of the inner 25a of the wire 25 coming out on the upper linkage arm 40 side is shortened, and the inner 25a of the wire 25 on the center float 11 side is shortened. The exit length becomes longer, and the linkage member 33 moves upward.

  As a result, as shown in FIG. 5, the center float 11 is stabilized in an upward posture (neutral state) in the operating state of the automatic lifting control, so that the ground contact area of the center float 11 to the surface G is reduced, and the spring 45 However, the biasing force that biases the center float 11 downward increases. Therefore, the center float 11 is in a state of actively crushing the mud on the surface G, and the ground-following sensitivity (control sensitivity of the automatic lifting control) of the center float 11 to the surface G becomes insensitive. This state is suitable when the mud on the surface G is relatively hard.

  As shown in FIG. 5, when the sensitivity lever 51 is operated and held on the sensitive side, the length of the inner 25a of the wire 25 coming out on the upper linkage arm 40 side becomes longer, and the inner 25a of the wire 25 on the center float 11 side becomes longer. The exit length is shortened, and the linkage member 33 moves downward.

  As a result, as shown in FIG. 5, the center float 11 is stabilized in a downward posture (neutral state) in the operating state of the automatic lifting control, so that the ground contact area of the center float 11 to the surface G is increased, and the spring 45 However, the biasing force that biases the center float 11 downward is reduced. Therefore, the center float 11 is in a state of sensitively reacting to the unevenness of the surface G, and the ground follow-up sensitivity to the surface G of the center float 11 (the control sensitivity of automatic elevation control) becomes sensitive. This state is suitable when the mud on the surface is relatively soft.

In the structure shown in FIG. 5, for example, when the center float 11 rides on a large mud lump and the center float 11 swings largely upward, the inner 25 a of the wire 25 is largely pulled toward the center float 11 side.
In such a state, the pulling operation of the inner 25a of the wire 25 causes the spool 38a of the control valve 38 to be operated to the raised position via the upper and lower linkage arms 40 and 41. Further, when the inner 25a of the wire 25 is pulled, the holding member 50 swings against the sensitivity lever 51 against the spring 54, and the outer 25b of the wire 25 is moved to the front side of the body (right side in FIG. 5). Moving to the front side (the right side in FIG. 5), the pulling operation of the inner 25a of the wire 25 is absorbed.

In the structure shown in FIG. 5, for example, when the center float 11 enters a large recess and the center float 11 swings greatly downward, the inner 25 a of the wire 25 is largely pushed toward the upper linkage arm 40.
In such a state, the spool 38a of the control valve 38 is operated to the lowered position via the upper and lower linkage arms 40 and 41 by pushing the inner 25a of the wire 25. Further, when the inner 25a of the wire 25 is pushed, the contact portion 25c of the wire 25 moves from the upper linkage arm 40 to the front side of the machine body (the right side in FIG. 5), and the pushing operation of the inner 25a of the wire 25 is performed. Absorbed.

[First Alternative Embodiment of the Invention]
Instead of the operating rod 17 in FIG. 5 in the above-mentioned [Best Mode for Carrying Out the Invention], a configuration as shown in FIG. 9 may be used.
As shown in FIG. 9, the operation rod 58 is slidably inserted into the boss portion 19 a of the operation arm 19 and extends forward, and a long hole 58 c is opened at the front end of the operation rod 58. The end of the linkage rod 43 on the rear side of the machine body is connected to the operation arm 42 while being inserted into the elongated hole 58c of the operation rod 58. A washer 58a is attached to the end of the operating rod 58 on the rear side of the machine body, and a spring 58b is fitted around the washer 58a.

  In a state where the seedling planting device 6 is lowered, the boss portion 19a of the operation arm 19 is separated from the spring 58b of the operation rod 58 toward the front of the machine body, and the control valve 38 is operated by the interchange action of the long hole 58a of the operation rod 58. The operation of the spool 38a is not restricted. In this state, as shown in FIG. 9, when the raising / lowering lever 29 is operated to the raised position and the seedling planting device 6 is raised, the boss portion 19a of the operating arm 19 moves to the rear side of the machine body and the spring 58b of the operating rod 58 is moved. To approach.

  Next, as shown in FIG. 9, when the link mechanism 5 (the seedling planting device 6) exceeds the set height (slightly below the mechanical upper limit position of the link mechanism 5), the boss portion 19a of the operation arm 19 Comes into contact with the spring 58b of the operating rod 58 and pulls the operating rod 58 to the rear side of the machine body (the seedling planting device 6 side). Thereby, the control valve 38 is operated to the neutral position, the operation plate 28 and the elevating lever 29 are operated to the neutral position, and the seedling planting device 6 stops at the upper limit position. In this case, the length of the operation rod 58 and the like may be set so that the seedling planting device 6 stops at a position slightly below the upper limit position.

[Second Embodiment of the Invention]
Instead of the operating rods 17 and 58 of FIGS. 5 and 9 in the above [Best Mode for Carrying Out the Invention] [First Alternative Embodiment of the Invention], a configuration as shown in FIG. 10 may be used. .
As shown in FIG. 10, an operation arm 59 (corresponding to a pulling operation unit) is fixed to the base of the lower link 5b of the link mechanism 5 toward the front side of the machine body, and is fixed around the fixed horizontal axis P9 above the operation arm 59. A bell crank 60 is swingably supported, and an operation rod 61 is connected between the operation arm 59 and the bell crank 60.

  As shown in FIG. 10, a boss portion 60a is supported on the bell crank 60 so as to be swingable up and down around the horizontal axis. The operating rod 62 is slidably inserted into the boss portion 60a of the bell crank 60, extends forward of the machine body, is connected to the operation plate 28, and a washer 62a is attached to the end of the operating rod 62 on the rear side of the machine body. The spring 62b is fitted on the washer 62a.

  The state shown in FIG. 10 is a state where the seedling planting device 6 is lowered and the boss portion 60a of the bell crank 60 is separated from the spring 62b of the operation rod 62 toward the front side of the machine body. In this state, when the raising / lowering lever 29 is operated to the raised position and the seedling planting device 6 is raised, the bell crank 60 is swung counterclockwise in FIG. 10 by the downward movement of the operation arm 59 and the linkage rod 61. The boss 60a of the bell crank 60 moves to the rear side of the machine body and approaches the spring 62b of the operating rod 62.

  Next, as shown in FIG. 10, when the link mechanism 5 (the seedling planting device 6) exceeds the set height (slightly below the mechanical upper limit position of the link mechanism 5), the boss portion 60a of the bell crank 60 is obtained. Contacts the spring 62b of the operating rod 62, and pulls the operating rod 62 to the rear side of the machine body (the seedling planting device 6 side). Thereby, the operation board 28 is operated to the neutral position, the elevating lever 29 and the control valve 38 are operated to the neutral position, and the seedling planting device 6 stops at the upper limit position. In this case, the length of the operation rod 62 may be set so that the seedling planting device 6 stops at a position slightly below the upper limit position.

  The present invention can be applied not only to a riding type rice transplanter but also to a riding type paddy field working machine such as a riding type direct seeding machine and a riding type medicine spreader.

6 Paddy field work device 7 Hydraulic cylinder 11 Height sensor 17, 58, 61, 62 Operation rod 19, 59 Pull operation part 24a Support point part 25 Linkage mechanism 28 Engaged member 29 Lifting lever 30 Engagement arm 36 Spring 37 Lifting operation mechanism 38 Control valve 40 Linking mechanism, upper part 41 Linking mechanism, lower part P2 Horizontal axis G

Claims (7)

The paddy field work device is equipped with a paddy field work device so that the paddy field work device can freely move up and down, and the paddy field work device is equipped with a height sensor that detects the height of the paddy field work device from the paddy surface while following the ground.
The machine body includes a hydraulic cylinder for raising and lowering the paddy field working device, and a control valve for operating and operating the hydraulic cylinder by supplying and discharging hydraulic oil to and from the hydraulic cylinder.
Elevating lever for artificially operating the control valve is swingably provided,
A link member that swings when the operation of the height sensor is transmitted through a link mechanism, and the control valve is configured to mechanically transmit the swing operation of the link member to the control valve; Is configured such that the paddy field work device is lifted and lowered so that the paddy field work apparatus is maintained at a set height from the surface of the paddy field.
The paddy field machine which supports the said elevating lever and the said connection member so that rocking | fluctuation is possible around the same fulcrum part of the horizontal direction with which the body was equipped.   The paddy field machine according to claim 1, wherein the control valve is configured to be artificially operable by the lift lever by operating the linkage member by the lift lever. The linkage member includes an upper part extending upward from the fulcrum part and a lower part extending downward from the fulcrum part,
The paddy field work machine according to claim 1 or 2, wherein the linkage mechanism is connected to an upper portion of the linkage member, and the control valve is connected to a lower portion of the linkage member. An engaged member that swings integrally with the elevating lever, an engagement arm that engages with the engaged member and can hold the elevating lever in a predetermined operation position, and the engagement arm A detent mechanism capable of holding the elevating lever in a predetermined operation position.
The engagement arm is supported swingably around a horizontal axis at a position different from the fulcrum portion, and extends vertically, and the engagement arm swings around the horizontal axis, thereby The paddy field work machine according to any one of claims 1 to 3, wherein an engagement arm is configured to engage and disengage from the engaged member.   The paddy field machine according to claim 4, wherein the engagement arm is arranged on the front side of the machine body with respect to the fulcrum part. An operation rod installed across the paddy field work device side, the lifting lever and the control valve side, and the paddy field work device ascending the operation rod when the lifting lever is operated to the raised position. A pulling operation unit for pulling operation to the working device side;
The paddy field work is mechanically transmitted to the lift lever and the control valve via the pull operation part and the operation rod, as the lifting operation of the paddy field working device due to the lift lever being operated to the raised position. The paddy field work machine according to any one of claims 1 to 5, wherein when the apparatus exceeds a set height, the lifting lever and the control valve are operated to a neutral position.   The ascending operation mechanism for operating the elevating lever to the ascending position as the airframe moves backward is provided on any one of the left and right center sides of the airframe relative to the linkage member and the linkage mechanism. The paddy field machine described.

Images