JPS6223612Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is based on a rice transplanter, more specifically, a rice transplanter, in particular, a rice transplanter, which is equipped with a float and a seedling transplanting device, and has wheels mounted on a shaft through a wheel support case that can swing vertically.
The present invention relates to a rice transplanter in which the support case is operatively connected to a piston member of a piston device, and the support case is swung under drive control by a control valve of the piston device to move the wheels up and down with respect to the machine body.

Conventionally, in this type of rice transplanter, a hydraulic cylinder having a cylinder rod is connected to the control valve of the piston device via a switching valve, and a part of the pressure oil of the control valve is supplied to the cylinder via the switching valve. At the same time, a swinging member is interlocked and connected to the operating portion of the control valve, and the swinging member is opposed to the cylinder rod, and the swinging member and the switching valve are driven by the swinging member. While the wire of the check lever is connected, the rod of the float, the piston device, and the planting lever are interlocked and connected to the swinging member, and when the planting lever and check lever are operated when turning around on a ridge, etc., the piston is activated. The device is driven to lower the wheels and pull up the float,
A portion of the pressure oil of the control valve is supplied from the control valve of the piston device to the hydraulic cylinder via the switching valve to extend the cylinder rod of the hydraulic cylinder, and the swinging member is forcibly swung in conjunction with the extension. The control valve is returned to the neutral position after a certain period of time or a predetermined period of time has elapsed, and the amount of downward displacement of the wheel is limited to a predetermined amount, thereby regulating the amount of wheel protrusion.

Incidentally, the amount of downward displacement of the wheel is determined by a part of the pressure oil of the control valve being supplied from the control valve of the piston device to the hydraulic cylinder via the switching valve, and the cylinder rod of the hydraulic cylinder being extended by the pressure oil. When the control valve reaches the neutral position, the drive is stopped and the wheels are moved downward by a certain amount. The pressure oil being supplied fluctuates due to the driving pressure of the piston device and the resistance of the wheels connected to the piston device when lowering, so it cannot always be said that the supplied hydraulic pressure is constant, and moreover, it cannot be said that the supplied hydraulic pressure changes when the supplied hydraulic pressure fluctuates. Depending on the valve, the fluctuation may become even larger,
As a result, the cylinder rod of the hydraulic cylinder cannot always be driven with a constant supply oil pressure, resulting in a time delay in driving the cylinder rod, and accurate control cannot be obtained.

The present invention was devised by focusing on the above-mentioned problems, and it is possible not only to keep the amount of downward displacement of the wheel constant at all times, but also to accurately regulate the amount of downward displacement of the wheel. To provide a rice transplanter capable of making the amount of wheel protrusion constant from the position even if the distance between the machine body and the machine varies due to unevenness of a tiller, etc., and accurately performing turn-over work.

That is, the present invention forms a rod-shaped movable member that extends in the same direction as the reciprocating direction of the piston member of the piston device, and allows the movable member to be moved relative to the operating portion by a certain length to the operating portion of the control valve. possible to interlock and connect,
A spring urges the movable member in a direction approaching the operating portion, and the piston member is provided with a locking/disengaging tool that can be freely engaged with and detached from the movable member, and when the piston member advances, the locking/disengaging tool engages with the movable member, as the piston member moves forward, the movable member is moved relative to the operating section by a certain length, and then the movable member is connected to the operating section;
The control valve is configured to return to a neutral position when the piston member advances a certain length, and the locking/disengaging tool is retracted from the engagement position of the movable member when the piston member retreats. By engaging the movable member and the locking/disengaging tool, it is possible to restrict the advance of the piston member and keep the amount of wheel protrusion constant, and even if the plowing depth of the wheel relative to the aircraft changes, it remains constant from that position. However, if the piston member of the piston device retreats due to leakage (leakage of pressure oil), allowing the retreat will prevent damage to the movable member or the locking/disengaging device. It is characterized by being able to eliminate the

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a side view of the entire machine, and 1 is a fuselage body, which includes a prime mover 2, a transmission case 3, a main body casing 5 having two planting claws 4, and a main body casing 5 having two planting claws 4. Guide members 6, 7 at the top
A seedling planting device 9 consisting of a seedling mounting stand 8 supported via
It is equipped with Further, a float 12 serving as a leveling member is provided at the lower part of the body 1 via a planting depth adjustment link 10 and a buffer member 11.
There is a wheel support case 1 that can swing vertically.
The wheel 14 is mounted on the shaft via 3. The wheels 14 are interlocked and connected to the prime mover 2, and the machine body 1 is driven by the prime mover 2 driving the wheels 14, and the planting claws 4 of the prime mover 2 and the seedling planting device 9
The planting claws 4 are driven by the prime mover 2 to grab the seedlings on the seedling stand 8 and plant the roots of the seedlings into the soil.

Reference numeral 15 denotes a control section of the machine body 1 connected to the rear of the seedling planting device 9, and the control section 15 includes a control handle 16, a travel lever 17 extending from the storage case 20, and a planting control lever. 18 and a speed change lever 19 are provided, and the planting operation lever 18 is guided by a U-shaped guide groove (not shown) provided in the storage case 20.

Further, as shown in FIGS. 2 and 3, the wheel support case 13 is interlocked and connected to a piston device 21 installed in the body 1, so that the piston device 21
The wheel support case 13 is swung under drive control by a control valve 35, and the wheels 14 are moved up and down with respect to the body 1. That is,
The piston device 21 includes a piston member 22 that reciprocates toward the rear of the fuselage 1, and the piston member 22
A support member 25 on which a spring receiving plate 23 and a spring 26 are interposed, and a lock plate 24 is extended therebetween.
, and the support member 25 is attached to the piston device 2.
The swing plate 28 is supported via a support shaft 29 by a guide rod 27 having one end fixed to the support member 25, while the intermediate portion of the swing plate 28 is swingably supported via a support shaft (not shown) at the lower part of the support member 25. The wheel support case 1 is attached to both ends of the swing plate 28.
A swing arm 31 connected to the base ends of 3 and 13,
31 are connected via swing rods 30, 30, and the piston member 22 is moved forward and backward to adjust the left and right wheels 14, 14 in and out at the same time.
Further, a lock pin 34 for regulating the swinging of the swing plate 28 is attached to the swing plate 28 via a support frame 70 so that the lock pin 34 can be freely moved in and out.
The lock pin 34 is connected via a wire 33 to a lever (not shown) provided on the grip of the control section 15 of the aircraft body 1, and the lock pin 34 is detachably engaged with a regulation hole 32 provided in the lock plate 24. By engaging and fixing the swing plate 28 and the lock plate 24 via the lock pin 34, the left and right wheels 14, 14 can be supported at approximately the same height. The lock pin 34 is removed from the plate 24, and the wheel support cases 13, 13 are driven by a control valve 35 interposed in the pressure oil supply circuit of the piston device 21.
When the swing plate 28 is swung, the left and right wheels 14, 14 are moved up and down relative to the machine body 1 according to the unevenness, such as during rice planting work near a ridge or when there are unevenness on the tiller in the field. In addition to allowing the aircraft to move, it also supports the aircraft 1 substantially horizontally.

Further, 36 is a rod-shaped movable member extending in the same direction as the reciprocating direction of the piston member 22 of the piston device 21, and the movable member 36 has one vertical surface and the other inclined surface in its length direction. A large number of tapered teeth 37 are continuously formed, and the movable member 36 is slidably attached to the spring receiving plate 23 interlockingly connected to the piston member 22 via a mounting seat 38. The member 36 is operatively connected to the operating portion 39 of the control valve 35.

That is, the operating portion 39 of the control valve 35 is connected to a spring 4 on a support shaft 40 provided on one side of the piston device 21.
The swing arm 41 and the automatic elevation control plate 42, which are elastically connected at 3, are swingably supported, and
The tip of the swinging arm 41 is interlocked and connected to a switching shaft 46 connected to the control valve 35 via a coupling arm 44 and a switching arm 45, and the swinging arm 41 of the operating section 39 is connected to the switching shaft 46 connected to the control valve 35 via a coupling arm 44 and a switching arm 45. 36 through a connecting arm 47,
One end of the connecting arm 47 is locked through an elongated hole 48 provided in the movable member 36, and is held within the elongated hole 48 by a spring 49 provided in the movable member 36.

Further, reference numeral 50 denotes a locking/disengaging tool which can be freely connected to and detached from each tooth 37 of the movable member 36. The locking/disengaging tool 50 is provided on the piston member 22 side, and the movable member is 36 is moved as the piston member 22 advances, and the locking/disengaging tool 50 is retracted from the movable member 36 when the piston member 22 retreats.

That is, a support cylinder 51 is fixed to the spring receiving plate 23 which is interlocked with the piston member 22, and a locking/disengaging tool 50 having a tapered upper part is connected to the spring 52.
The piston member 2 is attached to the piston member 2 so that it can be freely moved in and out within a certain range.
When the piston member 22 moves forward, the locking/disengaging tool 50 is loosened by the operation lever 18 and engaged with each tooth 37 of the movable member 36, and as the piston member 22 moves forward, the movable member 36 is moved through the locking/disengaging tool 50. When the piston member 22 is retracted, the locking/disengaging tool 50 is pulled by the operating lever 18 so as to be retracted from each tooth 37 of the movable member 36.

Further, the upper end of a lifting rod 54 is connected to the control plate 42 of the operating section 39 through a long hole, and the lower end of the rod 54 is connected to a bearing cylinder 56 through a shock absorbing spring 55. A bracket 57 integrally connected to the cylinder 56 is fixed to the float 12, and when the float 12 moves up and down due to the expansion and contraction of the buffer member 11, the control valve 35 is driven via the operation section 39 to move the piston member 22. The ground pressure of the float 12 is kept approximately constant by moving the float 12 forward and backward and adjusting the wheels 14 in and out.

Further, a float pressing spring 58 is locked to the control plate 42 of the operation section 39, and the control plate 42
A swing lever 59 with a spring 60 interposed therebetween is locked in the elongated hole, and the pressing spring 58 and the swing lever 59 are respectively interlocked and connected to the operating lever 18 of the aircraft control section 15 via a wire.

The present invention is constructed as described above.
The seedlings are loaded onto the ridge, and the prime mover 2 drives the wheels 14 and the planting claws 4 of the seedling planting device 9, causing the machine 1 to travel and planting the seedlings.When near the ridge, the machine 1 turns around and runs. This machine continuously performs rice planting work, and when the machine 1 turns around,
When the planting operation lever 18 is operated from the planting position at one upper end of the U-shaped guide groove to the constant wheel extension position at the bottom of the U-shaped guide groove, a driving member (not shown) connected to the lever 18 is activated. Through the seedling planting device 9
While the drive of the float 12 stops, the locking/disengaging tool 50 connected to the lever 18 engages with the teeth 37 of the movable member 36 via the wire 53, the pressing spring 58 of the float 12 is loosened, and the swing rod 59 is pulled, and the control plate 42 of the operating section 39 is moved in the direction of the arrow by the pressing spring 58 and the swing rod 59, and along with this movement, it is swung via the spring 43 provided on the support shaft 40. The movable arm 41, the connecting arm 44, etc. move to the left, driving the control valve 35 in the direction of raising the fuselage. In this case, the connecting arm 47 connected to the operating section 39 moves within the long hole 48 of the movable member 36 against the spring 49, and when the end of the connecting arm 47 comes into contact with the end surface of the long hole 48, the The leftward movement of the operating section 39 is stopped, and the driving of the control valve 35 is regulated, and the operating section 39 can move a certain amount regardless of the movable member 36, and can be driven within a certain range.

Further, as the control valve 35 is driven in the direction of raising the fuselage, the piston member 22 of the piston device 21 receives oil supply from the piston device 21, advances toward the rear of the fuselage 1, and the support member 25 interlocked with the piston member 22 moves forward.
The wheels are lowered via the swing plate 28 and the like, and the float 12 can be pulled up by a certain amount in conjunction with the fuselage 1.

That is, the piston member 22 is connected to the piston device 2.
As the fuselage 1 receives refueling and advances to the rear, the locking/disengaging tool 50 provided on the piston member 22 is in a state of being engaged with the teeth 37 of the movable member 36, so that it is interlocked with the piston member 22. Then, the locking and disengaging tool 50 and the movable member 36 move to the right, and this movement pulls the operating section 39 via the connecting arm 47, returning the control valve 35 from the body raised position to the neutral position, By returning the control valve 35, the oil supply to the piston device 21 is stopped and the piston member 22 is stopped.
The forward movement of the wheels 14 is stopped, and the amount of downward movement of the wheels 14 can be regulated to a certain amount necessary for turning around. Further, as described above, when the piston device 21 stops supplying oil and the piston member 22 stops moving forward, if the piston member 22 is subjected to a retreating action due to leakage from the piston device 21 (leakage of pressure oil), The piston member 22 is engaged with the movable member 36 and the locking/disengaging tool 50 via the spring receiving plate 23, but the locking/disengaging tool 50 is moved in and out from the teeth 37 of the movable member 36 by the spring 52. do,
This allows the piston member 22 to retreat, and prevents damage to the movable member 36 and the locking/disengaging tool 50 due to leakage of the piston device 21.

Also, as mentioned above, by operating the operating lever,
Since the movable member 36 and the locking/disengaging tool 50 are engaged with each other, the position of the wheel 14 with respect to the body 1,
That is, even if the distance between the wheels 14 and the machine body 1 changes due to unevenness of the tiller, the movable member 3
A constant amount of movement is obtained from the engagement position of each tooth 37 of 6 and the locking/disengaging tool 50, and the wheel 14 can be moved in accordance with changes in the field.
This makes it possible to keep the output amount constant.

Furthermore, when the lever 18 is operated to the planting position of the U-shaped guide groove after the machine body 1 is turned back and the planting operation is performed, the seedling planting device is activated via the drive member connected to the lever 18. 9 is driven, while the lever 18 is connected to the wire 5.
3 and is retracted from the teeth 37 of the movable member 36, the float pressing spring 58 is pulled, and the swing rod 59 is pushed, so that the control plate 42 of the operating part 39 moves in the direction opposite to the arrow. , the control valve 35 is driven in the direction of lowering the fuselage via the swing arm 41, etc., and along with this drive, the piston member 22 is retreated and the wheels 14 are raised, and the fuselage 1 is lowered.
The float 12 is lowered in conjunction with this.
In this case, the locking/disengaging tool 50 is retracted from the teeth 37 of the movable member 36, and the spring receiving plate 23 interlocked with the piston member 22 and the movable member 36 are slidable, so that the piston member 22 can move freely backwards.

Further, the wheels 14, 14 are raised via the swing plate 28, etc., and when the float 12 touches the field, the control plate 4 is raised via the rod 54.
2 is raised, the swing arm 41 and the like are moved to the left, the control valve 35 is returned from the body lowered position to the neutral position, and the retraction of the piston member 22 is stopped.

In addition, when driving on the road, the operation lever 18
When the lever is moved to the on-road running position at the other upper end of the U-shaped guide groove, the drive of the seedling planting device 9 is stopped via the drive member connected to the lever 18, while the movable member 36 of the locking/disengaging tool 50 is moved. As the engagement with the teeth 37 is retracted, the pressing spring 58 is loosened and the swing rod 59 is pulled, moving the control plate 42 in the direction of the arrow. The control valve 35 is driven in the direction of raising the aircraft through each arm 41...
0 and the teeth 37 of the movable member 36 are disengaged, the piston member 22 protrudes to the end in the advancing direction, and when located at the end, the piston member 22 is stopped by the guide rod 27 via the support member 25,
The refueling of the piston device 21 is unloaded, and the wheels 14 are lowered via the support member 25 and the swing plate 28, etc., without restricting the amount of oil flowing downward from the wheels 14. 12 can be pulled completely upwards.

As explained above, the present invention forms a rod-shaped movable member extending in the same direction as the reciprocating direction of the piston member of the piston device, and attaches the movable member to the operating portion of the control valve by a certain length with respect to the operating portion. The movable member is interlocked and connected so as to be relatively movable, and the movable member is biased toward the operating portion by a spring, and the piston member is provided with a locking/disengaging device that is freely engageable and detachable from the movable member, and the piston member At the time of advancement, the movable member is engaged with the movable member as the piston member advances, and the movable member is moved relative to the operating section by a certain length, and then the movable member is connected to the operating section. The control valve is configured to return to a neutral position when the piston member advances a certain length, and the locking/disengaging device is retracted from the position of engagement with the movable member when the piston member retreats. Therefore, when the aircraft turns around, the engagement of the locking/disengaging tool with the movable member drives and controls the control valve and the piston member for a constant amount of the engagement position, so that the amount of wheel protrusion is always constant. As a result, even if the pressure of the pressure oil supplied to the piston device is not constant, the conventional problem that a time delay occurs in driving the piston device and the amount of wheel protrusion is inaccurate is eliminated, This allows accurate wheel output control at all times. Therefore, even if the distance between the wheels and the machine body fluctuates due to unevenness of the tiller, the amount of wheel protrusion can be kept constant from the fluctuating position, and turning work can be performed accurately. If the piston member attempts to retreat due to a leak (leakage of pressure oil), the locking/disengaging tool is retracted from the engagement position with the movable member to allow the piston member to retreat and the movable member is moved back. This can eliminate damage to the locking and unlatching tools.

[Brief explanation of the drawing]

FIG. 1 is an overall side view showing an embodiment of the present invention, FIG. 2 is an enlarged side view of the main parts, and FIG. 3 is a plan view of the same. DESCRIPTION OF SYMBOLS 1... Airframe, 9... Seedling planting device, 12... Float, 13... Wheel support case, 14... Wheel, 2
1... Piston device, 22... Piston member, 3
5... Control valve, 36... Movable member, 37... Teeth,
49...Spring, 50...Latching/detaching device.

Claims (1)

[Scope of utility model registration request] A wheel is mounted on a body equipped with a float and a seedling planting device via a wheel support case that can swing vertically, and this support case is interlocked and connected to a piston member of a piston device. In the rice transplanter configured to swing the support case under drive control by a control valve to move the wheels up and down with respect to the machine body, a rod-shaped movable member extending in the same direction as the reciprocating direction of the piston member of the piston device is provided. forming a member, the movable member is interlocked and connected to the operating portion of the control valve so as to be movable relative to the operating portion over a certain length, and the movable member is biased in a proximal direction with respect to the operating portion by a spring. On the other hand, the piston member is provided with a locking/disengaging tool that can be freely connected to and disengaged from the movable member, and when the piston member moves forward, the locking/disengaging tool engages with the movable member, thereby causing the piston member to move forward. After the movable member is moved relative to the operating portion by a certain length, the movable member is connected to the operating portion, so that when the piston member advances by a certain length, the control valve is returned to the neutral position. and when the piston member retreats,
A rice transplanter characterized in that the engaging/disengaging tool is configured to be retracted from the engagement position with the movable member.