JPH052980Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of a locking device for rolling control in a rice transplanter.

[Conventional technology]

Conventionally, in order to prevent the aircraft from tilting to the left or right and becoming unstable due to the unevenness or inclination of the tiller when traveling in a soft field for rice planting, for example, in Japanese Utility Model Application No. 61-37735, the A swing lever is pivotally attached to the piston rod of the hydraulic cylinder for lifting, which is attached to the hydraulic cylinder for lifting and lowering. The left and right wheels are constructed so that they move up and down simultaneously in response to the protrusion and retraction of the piston rod, and by rotating the swing lever in the left and right directions with the rolling hydraulic cylinder, the piston rod of the rolling hydraulic cylinder is moved in and out. The left and right wheels are configured so that they move up and down upside down relative to each other, and a pair of float-shaped sensors are installed on both the left and right sides of the aircraft, and if the ground pressure on both the left and right sensors increases or decreases and moves up and down at the same time, the ground pressure can be adjusted. The wheels on both the left and right sides are raised and lowered at the same time so that the value of The wheels that support the rice transplanter are moved vertically in relation to the switching valve of the hydraulic cylinder depending on the situation, and the horizontal height of the body of the walking rice transplanter relative to the field is controlled to be approximately constant. In this invention, a structure is proposed in which the rotation of the swing lever in the left-right and front-back directions can be locked by engagement of a lock pin.

[Problem that the invention attempts to solve]

According to this prior art, when the traveling wheels are raised and the left and right sensors are in contact with the field, the left and right sides of the aircraft are controlled to be approximately horizontal, but when driving on the road, the left and right sensors are in contact with the field. Since the sensors are floating in the air, if both sensors are shaken up and down due to vibrations, the aircraft will automatically tilt left and right. In this case, in the prior art, the swing lever is engaged with a lock pin to lock it so that it does not rotate in the front-back direction, but if the aircraft is tilted to the left or right, the lock pin cannot be engaged, so a separate lock pin is engaged. The rolling correction operation and the locking operation must be carried out using separate manual means, such as adjusting the aircraft to a horizontal position by manual operation, and then performing the locking operation, which makes the operation extremely troublesome. A problem arose.

This invention improves the maneuverability of rice transplanters by making it possible to simultaneously adjust the attitude of the machine to a horizontal position by operating a single operating lever when locking rolling manually. The purpose is to

[Means for solving problems]

To achieve this objective, the present invention provides a rice transplanter that controls the horizontal inclination of the machine body via a rolling hydraulic cylinder in conjunction with a sensor that detects the horizontal inclination of the machine body with respect to the field scene. A manual operation system that manually operates the switching valve that changes the hydraulic pressure, and a lock operation system that maintains the height of the left and right wheels relative to the aircraft body at approximately the same height, are combined into a single operation that can be freely swung in two directions at right angles. connected to a lever-based operating mechanism, the operating mechanism being configured such that the lock operating system can be switched between a locking position and an unlocking position by moving the operating lever in one of the two orthogonal directions; , when switching the operating lever to the lock position, by moving the operating lever in the other of the two orthogonal directions, the switching valve is actuated to correct the heights of the left and right wheels to be substantially the same; It is configured as follows.

[Functions and effects of the invention]

In this way, in the present invention, the operating mechanism operated by the operating lever that can freely swing in two directions at right angles is as follows:
The manual operation system is connected to a lock operation system that maintains the height of the wheels on both the left and right sides of the aircraft body at approximately the same height, and when the operation lever is moved in one of the two right-angled directions, the lock is activated. The operating system allows you to select between a locked position where the aircraft does not roll or an unlocked position where rolling control is possible.

Therefore, in the unlock position, the operating rod of the hydraulic switching valve is actuated in response to the vertical swing of a pair of left and right sensors installed on the left and right sides of the aircraft, and the rolling hydraulic cylinder is driven. Normal rolling control can be performed so that the left and right sides of the field are approximately horizontal with respect to the field.

Then, in the lock position, by moving the operating lever in the other of the two orthogonal directions,
Since the switching valve can be operated via the manual operation system, the aircraft can be maintained horizontally with respect to the road surface, regardless of the vertical movement of both sensors, in other words, the height of the left and right wheels should be approximately the same. Can be fixed. The aircraft maintains the corrected attitude and locks it.

In this way, with the present invention, it is possible to select between the unlocked position and the lock position that enable rolling by simply operating one operating lever, and in the locked position, the operating lever can be moved in two perpendicular directions. By moving in the other direction, the left and right tilted posture of the machine can be corrected so that it is horizontal with respect to the road surface, making it extremely easy to operate and improving the maneuverability of the rice transplanter. It has a great effect.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 denotes an engine stand 3 with a downward U-shaped cross section, which is a front frame, at the front of the transmission case 2, and a transmission transmission via a frame 4 at the rear. A walking type rice transplanter consisting of a body 6 to which cases 5 are detachably connected, a pair of left and right wheels 7, 7 on both the left and right sides of the body 6, and a center float 8 longitudinally disposed on the lower surface of the body 6. A pair of left and right vertically swinging seedling planting mechanisms 9 are attached to the transmission case 5, and each seedling planting mechanism 9 can plant seedlings on both left and right outer sides of the center float 8. It is configured.

A pair of left and right operating handles 11, 11 are attached to the rear of the transmission case 5, and a seedling stand 10 is mounted on the upper surface of the pair of operating handles 11, 11 so as to be able to reciprocate left and right.

At the front end of the engine stand 3, which is detachably connected to the side surface of the transmission case 2 via bolts, there is a
A bumper 12 having a U-shape facing rearward in plan view is provided, and an engine 14 is mounted on the engine stand 3 with a hydraulic unit 13 facing forward and adjacent thereto. Furthermore, a lifting hydraulic cylinder 15 for raising and lowering both the left and right wheels 7, 7 at the same time and a so-called rolling hydraulic cylinder 16 for controlling the left and right tilt of the body 6 are mounted on the lower surface of the engine stand 3.

The front end of the center float 8 has a link 41 protruding therefrom facing a vertically communicating gap between the front end of the engine stand 3 and the bumper 12, and a vertical longitudinal hole in the link 41 is provided in the gap. The lower end of the seedling planting depth adjusting rod 42 provided between the control handles 11 and 11 is pivotally connected to the rear upper surface of the center float 8, so that the seedling planting mechanism 9 can control the field Constructed so that the depth of seedling planting on the surface can be adjusted.

The two wheels 7, 7 are connected to the transmission case 2.
The drive shaft 19 protrudes from both left and right side surfaces of the engine, and is pivoted at its base end so as to be vertically movable. It is rotationally driven by power transmitted through a transmission mechanism within the case 2.

The lifting hydraulic cylinder 15 for moving the left and right swing arms 18a, 18b up and down in the same direction to raise and lower both the left and right wheels 7, 7 at the same time is located at a lower surface position of the engine stand 3, and its rear end is connected to the It is attached to the rear plate 23 of the engine stand 3.

Piston rod 24 of the lifting hydraulic cylinder 15
is arranged so as to protrude in the front direction of the rice transplanter 1, and is attached to the piston rod 24 via the attachment piece 25. It is inserted into the front and rear longitudinal guide grooves 28, 28 so as to be movable back and forth.

A bracket 30 projecting upward from the left end in the direction of movement of the machine body of the inner shaft 29 fitted into the tube member 26 so as to be rotatable about its axis, and the arm 31 at the base end of the left swing arm 18a are connected to a connecting rod 32a. At the same time, a bracket 30 protruding downward from a boss 34 fitted onto the right end of the inner shaft 29 and fixed to a pin 33 is connected to the arm 31 at the base end of the right swing arm 18b by a connecting rod 32b. . As a result, the forward protruding movement of the piston rod 24 causes the swing arms 18 to move through the inner shaft 29.
a, 18b simultaneously rotate upward, and both wheels 7,
7 rises all at once, and conversely, due to the backward movement of the piston rod 24, both swing arms 18a, 18b
is configured so that the wheel rotates downward and both wheels 7, 7 descend simultaneously.

The rolling hydraulic cylinder 16 has a piston rod 36 pivotally connected to a bracket 35 in the middle of the inner shaft 29, while the rear end of the rolling hydraulic cylinder 16 is pivotally connected to a bracket 37 projecting backward from the pipe member 26. By operating a rolling sensor mechanism 22 and a hydraulic unit 13 on the engine stand 3, which will be described later, the rolling hydraulic cylinder 16 is driven and the inner shaft 29 is rotated around its axis. 7 are configured to move up and down in opposite directions. This performs so-called rolling control in which both the left and right sides of the machine are approximately horizontal with respect to the field.

Incidentally, reference numeral 38 is a bonnet cover that covers the upper part from the balance link mechanism 62 on the hydraulic unit 13 to the rear transmission case 5.

Hydraulic circuit 43 for driving the lifting hydraulic cylinder 15 and the rolling hydraulic cylinder 16
The hydraulic unit 13 constituting the hydraulic pump 4
5. Parts such as the oil tank 46, the distribution valve, the rotary type switching valve 47 that switches the hydraulic pressure to the lifting hydraulic cylinder 15, and the spool type switching valve 48 that switches the hydraulic pressure to the rolling hydraulic cylinder 16. It is installed integrally and gathered in one place.

Reference numeral 55 indicates a lifting sensor that operates a rotary switching valve 47 that switches the hydraulic pressure for the lifting hydraulic cylinder 15. The rotor 57 at the tip of the movable arm 56 is brought into contact with the upper surface of the center float 8, while the lever 58 attached to the base end of the arm 56 is connected to the shaft of the rotary switching valve 47.

The rolling sensor mechanism 22 for operating the rolling hydraulic cylinder 16 includes a pair of left and right float-shaped sensors 17a, 17b disposed so as to slide on the field surface on both the left and right sides of the center float 8, and It consists of a balance link mechanism 62 mounted on the hydraulic unit 13, and pivot arms 70, 70 that support the proximal ends, which are the front ends of the pair of sensors 17a, 17b, and are connected to the balance link mechanism 62.

The balance link mechanism 62 is connected to the hydraulic unit 13.
A cylindrical balance rod 65 extending in both the left and right directions of the machine body is fixed to the lower end of a boss 64 that is rotatably fitted onto a horizontal shaft 63 extending in the front and back direction of the machine body 1 from approximately the center of the left and right sides of the machine body in a bracket that projects upward. Arms 67, 67 are attached to both left and right ends of a shaft 66 which is rotatably fitted into the balance rod 65, and each arm has a turnbuckle 6.
One end of links 69, 69 with 8 is pivotally connected, and the other end of both links 69, 69 is connected to each pivot arm 7
It fits into the mounting hole 71 of 0.0, 70.

Also, a bracket 72 attached to the balance rod 65
The spool shaft 7 in the switching valve 48 is inserted into the engagement hole.
By engaging the substantially horizontal operating rod 75 at the four tips, the hydraulic pressure to the rolling hydraulic cylinder 16 is switched in accordance with the vertical movement of the balance rod 65 in the left-right direction of the machine body.

The base end of each pivot arm 70 is connected to the bumper 1.
Each pivot arm 70 is rotatably fitted onto a horizontal pivot portion 76a of a bracket 76 attached to the lower surface of the front end of the sensor 2, and is mounted on the upper surface of a reinforcing bracket 77 that protrudes laterally from the sensors 17a and 17b. Each pivot arm 70 and reinforcement bracket 77
are connected via a biasing spring 78 and a bolt 79, and when an upward external force of a certain level or more is applied to each sensor 17a, 17b, each sensor tilts to release the external force, thereby preventing overload. .

Reference numeral 80 denotes a manual operation system for manually operating the switching valve 48 for rolling. The hole 83 is loosely fitted into the rear part of the substantially horizontal operating rod 75 of the switching valve 48, and when traveling into the field, the pair of left and right rolling rods are pushed up by the field surface and swing up and down. The size of the window hole 83 in the engaging body 82 is adjusted so as to surround the range A (dotted chain line A in FIG. 7) of the operating rod 75 that operates via the balance link mechanism 62 in accordance with the movements of the sensors 17a and 17b. By setting , the operating rod 75 and the engaging body 82 do not interfere with each other during rolling control in the field, and the switching valve 48 can be operated via the engaging body 82 by a large turning operation of the operating lever 84, which will be described later. It is configured so that the rod 75 can be operated.

Reference numeral 85 is for holding the aircraft body 6 horizontally on the left and right with respect to the ground (road surface), in other words, locking the wheels 7 on both the left and right sides of the aircraft body 6 so that the height positions thereof are approximately the same. As shown in FIGS. 8 to 11, the lock operation system 85 includes a locking plate 8 with a locking hole protruding from the side surface of the piston rod 36 of the rolling hydraulic cylinder 16.
6, and a length adjustment rod 8 which is slidably fitted into the support piece 37a of the bracket 37 along the axis of the piston rod 36 and whose position can be adjusted with a bolt 88a.
8, a lock pin 89 biased by a spring 87 so as to be able to engage and detach from the length adjustment rod 88 into the locking hole 86a of the locking plate 86, and a flat cam 89a fixed to the lock pin 89. It consists of an operating wire 91 that rotates a lever 90 with a protrusion 90a for operating the lock pin 89 to protrude and retract.

An operating mechanism 92 for operating the operating wire 91 in the lock operating system and the operating wire 81 in the manual operating system 80 is disposed inside the rear end plate 38a of the bonnet cover 38, and is provided with a pair of upper and lower rotation supports. A frame 94 that is rotatable in the left-right direction by pins 93, 93, and a guide that is H-shaped in rear view and is formed on the rear end plate 38a and projects rearward from between a pair of left and right side plates 94a, 94a of the frame 94. It consists of an operating lever 84 that fits into the groove 95, and the base end of the operating lever 84 is connected to the side plates 94a, 94a.
The operating lever 84 is pivoted to be vertically movable on a pivot shaft 96 attached therebetween, and the midway portion of the operating lever 84 is vertically slidable along vertical longitudinal guide rails 97, 97 attached between the rear ends of the frame body 94. One end of the lock system operating wire 91 is connected to an arm 98 that rotates integrally with the base end of the operating lever 84.

In addition, the two operating wires 8 of the manual operating system
A T-shaped lever 101 to which one end of 1, 81 is attached is rotatably supported around a support shaft 102, and a guide groove 103, such as an arc-shaped one, formed in the lever 101 has a T-shaped lever 101 that protrudes from the frame 93. By inserting the pin 100 at the tip of the arm 99 and rotating the T-shaped lever 101 in the left-right direction in accordance with the left-right rotation of the frame 93 and pulling one of the operating wires 81, the This is for rotating the engaging body 82.

As a result, as shown in FIGS. 12 to 14, when the operating lever 84 is rotated to the upper position along the upper and lower long grooves of the guide groove 95, the operating wire 91 is pulled through the arm 98. In the lower position, the operating wire 91 becomes loose, which is the unlocked position K0.

With this configuration, during rice planting work, by rotating the seedling planting depth adjustment rod 54 in advance to adjust the height of the center float 8 with respect to the lower surface of the body 6, the seedling planting mechanism 9 can place the seedlings in the field. After setting the planting depth, use the lifting hydraulic cylinder 15.
moving the piston rod 24 forward,
Center float 8 on the lower surface of the descended aircraft 6
If the wheels 7, 7 are driven with the machine grounded on the field A, the machine will move straight, and by driving the seedling planting mechanism 9, the machine will use its seedling claws to remove the seedlings from the seedling pine on the seedling stand 10. Seedlings can be planted along multiple rows in the field by dividing the seedlings one by one.

At this time, by operating the operating lever 84,
When the lock release position K0 is set, the lever 90 biased by the spring rotates around the lock pin 89, and the protrusion 90a of the lever 90 moves the planar cam 89a backward against the force of the spring 87. The tip comes out of the locking hole 86a of the locking plate 86 of the piston rod 36 in the rolling hydraulic cylinder 16, and the piston rod 36 becomes freely retractable.

Therefore, the aircraft rolls and, for example, aircraft 6
When the right side of the sensor 17b is tilted downward, the sensor 17b on the right side is pushed up by the field surface, and the link 69 of the balance link mechanism 62 and the cylindrical balance rod 65
, the spool shaft 74 of the switching valve 48 is pulled up and switched, the hydraulic pressure is sent to the rolling hydraulic cylinder 16, the piston rod 36 of the rolling hydraulic cylinder 16 is protruded, the inner shaft 29 is appropriately rotated, and the right wheel 7 is rotated. While pushing down the left wheel 7, the right side of the fuselage is raised, and so-called rolling control is performed in which the left and right sides of the fuselage 6 are restored to a substantially horizontal state.

In this case, the window hole 83 in the engaging body 82 is larger than the range A in which the operating rod 75 of the switching valve 48 moves up and down (even if the operating rod 75 moves in the left-right direction depending on the case). The rod 75 and the engaging body 82 do not interfere with each other.

Therefore, the pair of left and right sensors 17a, 17
The operating rod 75 automatically moves in accordance with the movement of b, and the sensitivity of the sensor does not decrease.

In addition, when the rice transplanter 1 turns in the direction or runs on the road, the hand handle 59 near the control handle 11
When pulled, the operating rod 60 connected thereto rotates the rotary shaft of the rotary type switching valve 47 via the telescopic joint 61, and the piston rod 24 in the lifting hydraulic cylinder 15 is moved backward greatly. Since both swing arms 18a, 18b interlocked with this via the tube member 26, inner shaft 29, and connecting rods 32a, 32b rotate downward, the wheels 7, 7 attached to the tips of the swing arms
All at once, the aircraft descends relative to the aircraft 6, and the aircraft ascends.

When the aircraft 6 rises significantly in this way, the left and right rolling sensors 17a and 17b become suspended in the air, away from the field and road surface, and when both sensors 17a and 17b swing up and down due to vibrations of the aircraft, etc. Due to the rolling control, the left and right wheels 7, 7 move up and down in opposite directions, causing the body 6 to swing vertically from side to side, making it extremely difficult to operate the body.

In such a case, in the present invention, the operator first rotates the operating lever 84 to the lock position S0.
At this time, if the fuselage 6 is horizontal horizontally (in other words, the left and right wheels 7, 7 are at the same height relative to the fuselage 6), the lock pin 89 immediately engages the locking plate 86 on the piston rod 36. Stop hole 8
6a and lock it. Also,
When the body 6 is tilted in the left-right direction (in other words, when the height positions of the left and right wheels 7, 7 with respect to the body 6 are different), move the operating lever 84 to the right or left at the lock position S0. When this is done, the frame body 94 is rotated left and right around the rotation support pins 93 and 94, and either the right or left operating wire 81 is pulled through the arm 99 and the T-shaped lever 101, and the operating wire 81 is By pulling the engaging body 81 at the other end and rotating the engaging body 82 at the other end of the operating wire 81 to push or pull the operating rod 75 in the rolling hydraulic cylinder 48, one wheel 7 is raised higher and the other By lowering the wheels 7 of the aircraft, the left and right tilted posture of the aircraft body 6 can be corrected. At this time, the operating wire 91 in the locking system is loose, so when the locking hole 86a in the locking plate 86 and the locking pin 89 match, the locking pin 89 immediately fits into the locking hole 86a and locks. can.

As described above, according to the present invention, even if the aircraft body is tilted during the lock operation, it is possible to extremely easily correct the attitude of the aircraft body and perform the lock operation by operating the single operating lever 84.

Note that even in the unlocked position K0, the operation lever 84 can be rotated to the right or left to release the operation mechanism 9.
2, the manual operation system can be operated through the switch 2, so the switching valve 48 is forcibly operated by rotating the engaging body 82 upward or downward and pressing the upper or lower end surface of the window hole 83 against the operating rod 75. By doing so, it is possible to correct the attitude of the aircraft 6 so that it is approximately horizontal or tilt it arbitrarily to the right or left without depending on the pair of left and right rolling sensors 17a and 17b. .

Furthermore, at lock position S0, piston rod 3
The tip of the locking pin 89 protrudes toward the locking hole 86a of the locking plate 86 in a direction perpendicular to the axis of the locking plate 86, thereby preventing the piston rod 36 from moving, resulting in a so-called locked state. To adjust the position,
The position of the length adjustment rod 88 along the axial direction of the piston rod 36 can be determined using the bolts 88a, 88a, and the lock position can be adjusted very simply and easily after the rice transplanter is assembled. .

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the rice transplanter, FIG. 2 is a plan view, FIG. Figure 5 is an enlarged side view of the main part taken along the - line in Figure 3, and Figure 6 is an enlarged side view of the main part of Figure 5.
7 is an enlarged view of the main part of FIG. 5, FIG. 8 is a side view of FIG.
The figure is a side view taken from the - line in Figure 3, and Figure 10 is a side view of Figure 8.
FIG. 11 is a plan view of the main parts viewed from the - line in FIG. 10, FIG. 12 is a plan view of the operating mechanism, FIG. 13 is a sectional view taken from the - line in FIG. is a - line view of FIG. 12. 1...Rice transplanter, 2...Mission case, 6...
...Body, 7,7...Wheels, 8...Center float, 9...Seedling planting mechanism, 10...Seedling stand, 11...
Control handle, 18a, 18b... Swing arm, 14... Engine, 15... Hydraulic cylinder for lifting, 16... Hydraulic cylinder for rolling, 2
4, 36... Piston rod, 17a, 17b...
...sensor, 22...rolling sensor mechanism,
62... Balance link mechanism, 13... Hydraulic unit, 47, 48... Switching valve, 26... Tubular member,
29... Inner shaft, 28, 28... Guide groove, 30,
30... Bracket, 75... Operating rod, 80...
Manual operation system, 85...Lock system, 84...Operation lever, 83...Window hole, 82...Engagement body, 81,8
1, 91... Operating wire, 86... Locking plate, 87
... Bolt, 88 ... Length adjustment rod, 89 ... Lock pin, 90 ... Planar cam, 92 ... Operation mechanism,
93...Rotation support pin, 94...Frame body, 96...
Pivot shaft, 98, 99... arm, 100... pin, 101... lever, 102... support shaft.

Claims (1)

[Scope of utility model registration request] In a rice transplanter that controls the left and right tilt of the machine body through a rolling hydraulic cylinder in conjunction with a sensor that detects the left and right tilt of the machine body with respect to the field scene,
A manual operation system that manually operates a switching valve that switches the hydraulic pressure to the rolling hydraulic cylinder, and a lock operation system that maintains the left and right wheels at approximately the same height with respect to the aircraft body are connected to each other in two directions at right angles to each other. Connected to an operating mechanism with a single swingable operating lever,
The operating mechanism is configured such that the lock operating system can be switched between a lock position and an unlock position by moving the operating lever in one of the two orthogonal directions, and the operating lever is moved to the lock position. When switching, by moving the operating lever in the other of the two orthogonal directions,
1. A locking device for rolling control of a rice transplanter, characterized in that the switching valve is operated to correct the heights of both left and right wheels to be substantially the same.