JPS6337780Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a device for vertically moving wheels for a walk-behind rice transplanter, and more specifically, the device moves the wheels vertically in response to the hardness and softness of the top soil in the field, making it possible to adjust the sensitivity of the vertical motion, and connecting the planting clutch and the traveling clutch. This invention relates to an interlocked vertical movement device.

[Conventional technology]

One of the walk-behind rice transplanters has a float attached to the bottom of the rice transplanter's body, and one end of the swing arm that also serves as a transmission case is pivotally supported on both sides of the machine. A wheel is attached to the other end, and regardless of how deep or shallow the tiller is, the float's buoyancy keeps the machine at a constant position above the field surface, and only the wheels are always in contact with the tiller, providing driving force. It is configured to move up and down, so that the planting depth of seedlings is always constant. Also,
Equipped with operating tools for planting clutch and traveling clutch.

[Problem that the invention attempts to solve]

A walk-behind rice transplanter configured in this way requires the wheels to be in contact with the tiller at all times.
It is equipped with a mechanism for moving the wheels up and down using a hydraulic drive source, and this uses the change in buoyancy due to the rise and fall of the float as the switching force of the switching valve in the hydraulic pipe of the hydraulic drive source to drive the wheels either up or down. . However, if the wheels move up and down all the time while running, or in other words, changes in the buoyancy of the float are immediately and frequently transmitted to the wheels, the vertical vibrations of the rice transplanter itself will increase, which will actually disturb the planting depth. The sensitivity with which changes in the buoyancy of the float are converted into vertical motion of the wheels is preferably determined in relation to the hardness of the soil in the field. In addition, if the wheels move up and down in the same way as during planting with the planting clutch disengaged, the float will push mud more often when the aircraft turns, and the traveling clutch may be disengaged to stop the aircraft and replenish the seedlings. If the wheels are moved up and down during this process, there are problems such as difficulty in replenishing seedlings.

[Means to solve the problem]

Therefore, the present invention was developed to adjust the operating sensitivity of the switching valve installed in the hydraulic circuit that moves the wheels up and down in conjunction with the vertical movement of the float so that the operating sensitivity of this operating mechanism can be adjusted from near the handlebars of the operator. In addition to providing the operating tool 61, the operating mechanism and the operating tool 71 are interlocked so that this sensitivity adjustment can be performed by turning the planting clutch operating tool 71 on and off, and the operating mechanism is operated by turning the clutch on and off of the planting clutch operating tool 71. It is characterized in that it is interlocked with regulation so that the wheel does not move downward due to the movement.

[Effect]

With this configuration, the present invention allows the wheel vertical motion sensitivity to be adjusted, but when the planting clutch is turned off, the wheel vertical motion sensitivity becomes more sensitive, reducing mud pushing by the float when turning. Furthermore, when the travel clutch is turned off, the float does not move upward, allowing stable seedling replenishment work.

【Example】

An embodiment of the present invention will be described below with reference to the accompanying drawings. Figure 1 is a side view of a walking rice transplanter.The machine body 1 is equipped with an engine 11 as a power source, a float 2 is attached to the bottom of the machine body, and the rear end of the float 2 is connected to the machine body 1. On the other hand, the link 2 is pivoted by a pivot shaft 21, and the front end is pivoted at the middle part.
It is supported by 2. Further, one end of a swing arm 3 which also serves as a transmission case is pivotally supported on both sides of the body 1, and a wheel 31 supported by an axle is attached to the other end. The wheels 31 are moved up and down by rotating the swing arm 3 around the pivot point, and the power source thereof is
A hydraulic cylinder unit 4 is used as a vertical movement mechanism, and the swing arm 3 is rotated by expansion and contraction of a rod 41. An oil pump 42 is connected to the switching valve 4 in the hydraulic cylinder unit 4.
Connected via 3. Then, the vertical movement of the float 2 is transmitted to the switching valve 43 via an operating mechanism 50, which will be described later, and the operator adjusts the sensitivity of the operating mechanism 50 using a sensitivity adjustment mechanism 60 to adjust the sensitivity of the field. Adjust the operating sensitivity to match the soil hardness. The actuating mechanism 50 includes a sensing rod 51 whose one end is pivotally supported by the float 2.
The upper end is pivotally connected to a swinging body 53 which is pivotally supported at a side position of the hydraulic cylinder unit 4 by a pivot pin 52, and at a position near the tip of this swinging body 53, the upper end is pivoted at a side position of the hydraulic cylinder unit 4. It is composed of a swinging arm 54 which is pivotally supported together with a swinging body 53 by a pivot pin 52, and a stopper 53a formed at the end of the swinging body 53 is locked to the side surface of the swinging arm 54. Further, the actuation mechanism 50 has a switching rod 55 pivotally connected to the lower end of the swing arm 54, and the other end of the switching rod 55 is pivotally connected to the end of the operating lever 43a of the switching valve 43. It's summery. And the sensing rod 5
1 is formed of two members, a sensing rod body 5
A connecting body 51b is fixed to the lower end of 1a,
A float rod 51c, which extends vertically through the connecting body 51b and whose lower end is pivotally connected to the float 2, is provided with ground pressure by a compression spring 51d. Further, an arcuate guide groove 53b is formed in the swinging body 53, and an arcuate guide groove 54a is formed at the end opposite to the switching rod of the swinging arm 54. The ends of the operating rods of the mechanism 60 are connected. In the adjustment mechanism 60, a sensitivity adjustment lever 61 is fixed to an operation shaft 62 near the operation handle, and the base of the sensitivity adjustment lever 61 is inserted into a recess 63a of a lever locking plate 63 fixed to the operation shaft 62. The locking plate 63 can be fitted in, and the locking plate 63 is pushed in one direction by a spring 63b. Locking plate 6
3 has an overhanging arm 63c, and this arm 6
One end of an outer tube 64a of the adjustment wire 64 is fixed to the end of the adjustment wire 3c. The other end of the outer tube 64a is fixed to a support frame 65 fixed to the fuselage side.
The inner wire 64b inserted into the support frame 6
5 and is connected to the swing arm 54 via a tension spring 66. Further, the other end of the inner wire 64b extends from the outer tube 64a, and that end is fixed to an arm 71a extending from a collar 67 fitted to the operating shaft 62. The base of a planting clutch operating lever 71 that turns the planting clutch on and off is fixed to the collar 67, and the end of a planting clutch operating wire 71c is fixed to an arm 71b extending from the collar 67. ing. The sensitivity adjustment lever 61 is movable along an operating groove 72a provided in an operating panel 72, and has a two-stage notch 7 provided in the operating groove 72a.
The operating position can be fixed to either 2b or 72c. Notch 72b is the position selected when the tilled soil is soft.
When the lever 61 is selectively locked, the spring 66
becomes slack, the upward movement resistance of the float 2 decreases, and the control sensitivity becomes more sensitive. Notch 72c is the opposite. Further, an operating rod 82a connected to one end of a wire 82 interlocking with an operating lever 81 of the travel clutch is inserted through the support frame 65, and this operating rod 82a is pushed by a spring 83.
The end of the operating rod 82a is fitted into the guide groove 53b of the swinging body 53. One end of a clutch operation wire 84 that controls the travel of the rice transplanter is connected to the operation lever 81 of the travel clutch, and the movement of the rice transplanter is stopped (the position of the operation lever 81 of the travel clutch is "off"). Then,
The float 2 is pressed against the rice field surface, the wheels 31 do not move downward, and the float 2 is in a seedling replenishment position. Furthermore, an operating rod 92a is inserted through the support frame 65 and is connected to one end of a wire 92 that is linked to a lift operating lever 91 that forcibly moves the wheel 31 up and down, especially down. 92a is pressed by a spring 93. The end of the operating rod 92a is fitted into the guide groove 54a of the swing arm 54. When the lift operation lever 91 is set to the "lift" position, the switching valve 43 is moved to the lower wheel position, which rotates the swing arm 3 downward to move the float 2 away from the rice field. By lifting the float 2 and setting it to the "planting" position, the wheels are moved up to the position where the float 2 touches the rice field. Next, the operation of the vertical movement device for wheels for a walking rice transplanter according to the present invention will be explained. First of all, if the tilled soil in the field where rice planting is done is hard, it is better for the vertical movement of the wheels to be slow. Therefore, if there is some unevenness, the vertical movement of the wheels, or in other words, the float, may be slow. It slows down the process. For this purpose, the sensitivity adjustment lever 61 is moved to the "hard" position and fixed to the notch 72c. By moving the sensitivity adjustment lever 61 to the "hard" position, the sensitivity adjustment lever 61 is fitted into the recess 63a of the locking plate 63, so the locking plate 63 is rotated about the operating shaft 62, and the arm 63c is rotated. The outer tube 64a fixed to is compressed, and the inner wire 64b is pulled and the spring 66 is stretched, and the rotation of the arm 54 rotates the swinging body 53 via the stopper 53a to move the float 2 downward. This causes the upward movement resistance to increase and become insensitive. When the rice transplanter runs in the field in this state, the float 2 moves up and down according to the unevenness of the tiller, and the up and down movement of the float 2 causes the sensing rod 51 to move up and down, which pivots the rocking body 53. It is rotated around the pin 52. For example, if the tiller becomes shallow and the wheel 31
When the float 2 attempts to move upward (the float 2 moves downward), the oscillating body 53 is rotated by the tension of the sensing rod 51, but the oscillating body 53 rotates the oscillating arm 54 until the stopper 53a hits the oscillating arm 54. First, it moves idly around the pivot pin 52. The float 2 still moves downward, in other words, the wheel 3
1 tries to move upward, the stopper 53a of the swinging body 53 hits the side surface of the swinging arm 54, causing the swinging arm 54 to rotate. The rotation of the swinging arm 54 causes the switching rod 55 to move directly, which causes the switching lever 43a of the switching valve 43 to rotate, and the wheel 3
1 is opened, and the swing arm 3 is rotated about the pivot point by the hydraulic cylinder unit 4 to move the wheel 31 upward. Therefore, the vertical movement of the wheel is not performed by the vertical movement of the float 2 until the stopper 53a reaches the side surface of the swinging arm 54. In other words, the float 2 exceeds the stroke at which the stopper 53a hits the swinging arm 54. The wheels 31 do not move up and down within a range that does not move up and down. If the cultivated soil in the field is soft, the sensitivity adjustment lever 61 is moved to the "soft" position and fixed to the notch 72b. Sensitivity adjustment lever 61
The locking plate 63 also rotates by the rotational movement around the operating shaft 62 of the arm 63c, and the adjustment wire 6 is rotated by the arm 63c.
The outer tube 64a of No. 4 becomes loose. Therefore, the tension of the inner wire 64 also becomes weaker, and the spring 6
6 tension is weakened. Therefore, the upward movement resistance of the float 2 is reduced, and the switching of the switching valve 43 when lowering the wheel 31 is performed with a weak force, making it sensitive. In this state, turn off the planting clutch lever 71.
When set to "on", the inner wire 64b is weakened, and the upward movement resistance of the float 2 becomes extremely weak, making it sensitive. Conversely, when set to "on", the inner wire 64b becomes moderate, and appropriate automatic control is performed. In this state, as the rice transplanter moves across the field, the wheels 31 and float 2 move up and down due to the unevenness of the tiller, but if the float 2 goes down, the third sensing rod 51
As it moves downward as shown by the arrow in the figure, the swinging body 53 rotates around the pivot pin 52, and since the stopper 53a and the swinging arm 54 are rapidly engaged, the swinging body 53 swings. Arm 54 is immediately rotated. The rotation of the swing arm 54 is converted into linear motion by the switching rod 55, and by rotating the switching lever 43a of the switching valve 43, an oil passage through which the wheels 31 move upward is opened. When the oil passage opens, the hydraulic cylinder unit 4 contracts and the swing arm 3
is rotated to move the wheel 31 upward. Therefore, the upward movement of the wheels immediately follows the downward movement of the float 2, and adapts to the shallow area of the plowing platform. Furthermore, when the float 2 moves upward in the opposite direction to the arrow, the stopper 53a of the swinging body 53 moves in the direction away from the swinging arm 54, so the switching rod 55 is not moved directly, but the rice transplanter When rice planting is being carried out in the field, the lift operating lever 91 is in the "planting" position, the planting clutch operating lever 81 is in the "on" position, and the wire 82 and the clutch operating wire 84 are in the "on" position. The end of the operating rod 82a is pulled to the oscillator 53.
Since the swinging body 53 is pulled at the end of the guide groove 53b, the swinging arm 54, which is urged to be pulled by the inner wire 64b, hits the stopper 53a and the vertical movement of the sensing rod 51 immediately stops swinging. The switching rod 5 is connected via the moving body 53 and the swinging arm 54.
5 to raise the float 2 and lower the wheel 31. Then, when the running state changes to the stopped state and the operating lever 81 is shifted to the "off" position, the wire 82 is pulled and the operating rod 82a is positioned at the lower end of the guide groove 53b, allowing the float 2 to move upward. First, when seedlings are replenished and loaded onto the seedling platform in this state, the float 2 can be pressed against the rice field surface, thereby reducing the inclination of the rice transplanter. Conversely, when the operating lever 81 is turned on, the operating rod 82a
is located in the middle of the guide groove 53b, automatic control becomes possible, and vertical movement of the float 2 is permitted. In addition, when the rice transplanter runs around at the end of the planting row (headland), the planting clutch lever 71 is in the "off" position, so the vertical movement of the wheels 2 is sensitive.
When the lift lever 91 is shifted to the "lift" position in order to reduce mud pushing by the float 2 and move the wheel 31 to its lowest position, the wire 92 is pulled and the spring 93 is compressed, and the operating rod 92a The end part pulls the end of the guide groove 54a of the swinging arm 54, and the swinging arm 54 is moved to the third position.
It is rotated in the direction opposite to the arrow in the figure, and the switching rod 55 is moved in the direction opposite to the arrow. As a result, the oil passage of the switching valve 43 is opened in the direction in which the wheels move downward, and the hydraulic cylinder unit 4 is extended to rotate the swing arm 3 and move the wheels 31 downward, making it possible to turn on a headland or drive on the road.

[Effect of the idea]

As is clear from the above explanation, the device for vertically moving wheels for a walk-behind rice transplanter of the present invention has an operating mechanism that moves the wheels 2 vertically in conjunction with the vertical movement of the float 2. A sensitivity adjustment operating tool 61 is provided near the handle, and this sensitivity adjustment is performed by turning the clutch of the planting clutch operating tool 71 on and off.
Since the planting clutch can be operated in conjunction with the button, it is possible to adjust the sensitivity of the vertical movement of the wheel 2, while also allowing the planting clutch to be turned off.
By doing so, the above-mentioned vertical motion sensitivity becomes sensitive, and when the aircraft turns, there is less mud pushing by the float 2, and turning can be performed easily. In addition, the operating mechanism is interlocked to prevent the wheel 2 from moving downward due to the disengagement of the travel clutch, so when the travel clutch is disengaged, the float 2 is not allowed to move upward and the aircraft is stably supported, and the wheels do not lower when replenishing seedlings, allowing stable replenishment work.

[Brief description of the drawings]

The attached drawings show an embodiment of the vertical movement device for wheels for a walking rice transplanter according to the present invention, and FIG. 1 is a side view of the walking rice transplanter, and FIG. 2 is a conduit showing the vertical movement drive system of the wheels. The explanatory diagram, FIG. 3, is an explanatory diagram showing the relationship between the operating system and the upward drive system. 1... Airframe, 11... Engine, 2... Float, 21... Pivot shaft, 3... Swing arm, 3
1...Wheel, 4...Hydraulic cylinder unit, 41
... Rod, 42 ... Oil pump, 43 ... Switching valve, 50 ... Operating mechanism, 51 ... Sensing rod, 52
... Pivot pin, 53 ... Rocking body, 53a ... Stopper, 53b ... Guide groove, 54 ... Swinging arm, 54a ... Guide groove, 55 ... Switching rod,
60...adjustment mechanism, 61...sensitivity adjustment lever, 6
2... Operating shaft, 63... Lever locking plate, 63a...
...Concave notch, 63b...Spring, 63c...Arm, 6
4... Adjustment wire, 64a... Outer tube,
65...Support frame, 66...Tension spring, 6
7... Collar, 71... Planting clutch operating lever, 71a, 71b... Arm, 71c... Planting clutch operating wire, 72... Operation panel, 72
a... Operating groove, 72b, 72c... Notch, 81
... Traveling clutch operation lever, 82 ... Wire,
82a...operation rod, 83...spring, 84...
Clutch operating wire, 91... Lift operating lever, 92... Wire, 92a... Operating rod, 9
3...Spring.

Claims (1)

[Scope of Claim for Utility Model Registration] A walk-behind rice transplanter comprising a rice transplanter main body having a float, a swing arm pivotally supported on both sides of the rice transplanter main body, and wheels attached to the ends of the swing arm. , the operating mechanism of the switching valve installed in the hydraulic circuit that moves the wheels up and down in conjunction with the up and down movement of the float.
A sensitivity adjustment operating tool 61 is provided so that the operating sensitivity of this operating mechanism can be adjusted from near the handle by the operator, and a planting clutch operating tool 71 is provided to adjust the sensitivity.
The operating mechanism and the operating tool 71 are interlocked so that they can be operated when the clutch is "on" or "off," and the operating mechanism is interlocked so as to prevent the wheels from lowering due to the "off" operation of the traveling clutch. Vertical movement device for wheels for walking rice transplanters.