JPH0258888B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a hydraulic switching device in a single-wheel rice transplanter. (Prior art) The conventionally known Japanese Utility Model Application Publication No. 57-135218 discloses a frame to which an engine is attached, a wheel transmission case whose front end is pivoted to the frame and whose rear end is movable up and down, and the wheels. A single wheel attached to the rear end of the transmission case, a walking steering handle attached to the rear of the frame, a seedling tank provided in front of the walking steering handle, and a seedling tank located below the seedling tank. A planting rod provided, a left and right float that is pivoted to the frame side and whose front end moves up and down depending on the depth and shallowness of the paddy field, and a switching valve provided on the frame side that is switched by the up and down movement of the front end of the left and right float, It consists of a hydraulic cylinder provided on the frame side that expands and contracts when the switching valve is switched to move the wheels up and down, and the switching valve connects the manual lever and the switching valve so that it can also be switched by operating a manual lever. The structure is shown. (Problems to be Solved by the Invention) In the known one-wheel rice transplanter, when the entire machine sinks when it reaches a deep part of the paddy field, the front side of the float is lifted by water pressure, and the switching valve is switched as the front side of the float rises. This structure prevents deep planting by extending the hydraulic cylinder and lowering the wheels to raise the frame side. When turning at the end of the field, the planting rod clutch is disconnected to interrupt planting, and then the switching valve of the hydraulic system for moving the wheels up and down is switched using the manual operation lever to lower the wheels and turn. A problem with this structure is that it is difficult to operate the switching valve using the manual operation lever. That is, since the switching valve is switched by the vertical movement of the float, when the switching valve is switched by the manual operation lever, the left and right floats are also lifted up in conjunction. (Object of the Invention) Therefore, the present invention provides a rice transplanting apparatus having the above-mentioned structure, in which switching of the switching valve by the manual operation lever is made easier. (Means for Solving the Problems) Therefore, the present invention includes a frame 1 to which an engine 2 is attached, a wheel transmission case 14 whose front end is pivoted to the frame 1 and whose rear end is movable up and down, and the wheel transmission case 14. A single wheel 17 attached to the rear end of the transmission case 14
, a walking control handle 4 attached to the rear of the frame 1, a seedling tank 5 provided in front of the walking control handle 4, a planting rod provided below the seedling tank 5, Left and right floats 8, 8' are pivoted to the frame 1 side and whose front ends move up and down depending on the depth and shallowness of the paddy fields, and a switching valve provided on the frame 1 side which is switched by the up and down movement of the front ends of the left and right floats 8, 8'. 49, a hydraulic cylinder provided on the frame 1 side that expands and contracts by switching the switching valve 49 to move the wheels 17 up and down, and the walking steering handle 4 that turns on and off the planting clutch of the planting rod. In a single-wheel rice transplanter comprising a planting clutch lever 56 provided, the switching valve 49
connects the planting clutch lever 56 and the switching valve 49 so as to be switched by turning on/off the planting clutch lever 56, and the switching valve 49 is connected between the left and right floats 8, 8' and the switching valve 49. When the switching valve 49 is switched by operating the planting clutch lever 56 side, the left and right floats 8,
This is a hydraulic switching device for a single-wheel rice transplanter equipped with a one-sided lifting mechanism in which only one of the floats 8' moves upward. (Embodiment) To explain with reference to embodiment drawings, reference numeral 1 denotes a frame that is long and bifurcated in the front-rear direction, and an engine 2 is attached to the front end of the frame 1. The upper end of the planting transmission case 3 is connected to the rear end of the frame 1, and the walking control handle 4 is connected to the rear of the lower end of the planting transmission case 3.
Join the front ends of. Reference numeral 5 denotes a seedling tank, which is attached to the front side of the walking steering handle 4 by sliding tools 6 and 7 so as to be movable in the left and right directions. 8 and 8' are a pair of left and right floats. The floats 8, 8' are pivoted 9 at the lower position of the walking steering handle 4 at their front and rear intermediate positions.
The front end of 8' is movable up and down, and the lower part of the mounting rod 10 is pivotally attached to shafts 11 and 11'. A long hole 12 is formed in the mounting rod 10 in the length direction, and a pin 13 is inserted into the long hole 12 to fix it to the frame 1. A wheel transmission case 14 is provided at the front end of the frame 1.
The front end of the wheel transmission case 14 is pivoted 15, and the rear end of the wheel transmission case 14 is formed to move up and down around the pivot 15. An axle 16 is made to project laterally at the rear end of the wheel transmission case 14, and a single wheel 17 is attached to the axle 16. As shown in FIG. 2, the frame 1 is provided with a protrusion 18 projecting downward, and the base of a hydraulic cylinder 20 is pivotally attached to the protrusion 18 by a shaft 19. The hydraulic cylinder 20 extends forward approximately horizontally, and its piston 2
A washer 23 is fitted to the tip of the link rod 25 via a spring 22, and the lower end of the link rod 24 is pivoted to the washer 23.
do. The upper end of the link rod 24 is pivoted to the frame 1 side 26
Furthermore, the front end of a rotating rod 27 is fixed to the upper end of the link rod 24 (the link rod 24 and the rotating rod 27 are fixed and rotate together). The upper end of the rod 28 is pivoted 29 to the rear free end of the rotating rod 27, and the lower end of the rod 28 is pivoted 30 to the wheel transmission case 14. Therefore, when the piston 21 extends, the link rod 24 and the rotating rod 27 rotate clockwise together, and the rod 28 moves downward to move the wheel transmission case 14 and the wheels 17 downward. As shown in FIG. 3, rods 31,
The lower end of 31' is pivoted to 32, 32', and the rod 31,
The upper end of 31' is pivotally attached to the rotating ends of arms 33, 33' 34, 34'. As shown in FIG. 2, long holes 35, 35' are formed in the arms 33, 33' in the longitudinal direction.
35' Both ends of the balance rod 36 in the left and right direction are pushed through and supported (FIG. 3). The base ends (front ends) of the arms 33, 33' are pivotally attached to the left and right rotation shafts 37, respectively, 38, 38'.
The base end (front end) of the engagement rod 39 is fixed to the left and right middle of the rotation shaft 37, and the rotation side (rear end) of the engagement rod 39
is inserted into a tube 40 fixed at a position slightly off the left and right center of the balance rod 36. This is an example of a one-sided upward movement mechanism. A rotating arm 41 is fixed to one end of the left and right sides of the rotating shaft 37. The rotation end of the rotation arm 41 has a rotation shaft 3.
A circular arc elongated hole 42 centered at 7 is formed, and the elongated hole 4
2 locks the front end of the rod 43, and the rear end of the rod 43 is inserted into a washer 46 via a tube 44 and a spring 45, and the washer 46 is attached to the frame 1. 47 is a spring that constantly moves the rod 43 backward. The front end of a relay rod 48 is fixed to the tube 44,
The rear end of the relay rod 48 is connected to the hydraulic cylinder 2.
It is locked to the rotating end of the valve arm 50 of the switching valve 49 of No. 0. The front end of a rod 51 is locked to the center in the length direction of the valve arm 50, and the rear end of the rod 51 is locked to the rotating end of an arm 52 fixed to a rotating shaft 53 that is fixed to the frame 1. do. The base end of an arm 54 is fixed to the other end of the rotation shaft 53. The tip of a wire 55 is locked to the rotating end of the arm 54, and the rear end of the wire 55 is locked to a manual planting clutch lever 56 provided at the rear end of the walking steering handle 4. 57 is a seedling, and 58 is a support rod for the rotating shaft 37. (Effect) Next, the effect will be described. A. Overall action When a desired amount of seedlings 57 are placed in the seedling tank 5 and the engine 2 is started and maneuvered while walking, the rotation of the engine 2 is transferred from the shaft fitting 15 to the wheel transmission case 14.
The rotation of the engine 2 is transmitted through the frame 1 to the axle 16 to rotate the wheels 17 to move forward, and at the same time, the rotation of the engine 2 is transmitted within the frame 1 to the planting transmission case 3.
Seedlings 57 are planted one by one in the field by moving the planting rod up and down. B Action when the paddy field is deep When the paddy field is deep, the aircraft sinks along with the wheels 17, and both the left and right floats 8, 8' also sink, but since both the left and right floats 8, 8' have buoyancy, both the left and right floats 8, 8 The front end of ' moves upward around the pivot 9. Therefore, the rods 31, 31' (second
(Fig.) is moved upward, and the rear ends of the arms 33, 33' are moved upward, and the elongated holes 35, 3 of the arms 33, 33' are moved upward.
The lever 36 inserted between the levers 5' is moved up evenly to the left and right to lift the rear end of the engagement rod 39 whose rear end is locked to the lever 36. When the engaging rod 39 is moved upward, the engaging rod 39
The rotating shaft 37 to which the front end of the rotating shaft 37 is fixed rotates,
The rotating arm 41 fixed to one end of the rotating shaft 37 is rotated counterclockwise as shown in FIG. 2, pushing the rod 43 backward, and moving the relay rod 48 fixed to the cylinder 44 of the rod 43 backward. , rotate the valve arm 50 clockwise to switch the switching valve 49. Therefore, oil is sent to the hydraulic cylinder 20, the piston 21 is extended, the washer 23 is moved to the left in FIG. 28, the wheel transmission case 14 is rotated downward, and the wheel 1
7 to prevent the frame 1 from lowering. C Effect during turning When planting in a normal paddy field, the valve arm 50 is in the position shown in Fig. 2 and the wheels 17 are in the upward movement position, but at the end of the field the planting is performed for turning. When the planting clutch lever 56 for stopping the planting rod is grasped and cut, the planting clutch lever 56 → wire → 55 → arm 54 → rotating shaft 53 → arm 52 → rod 5
1 to switch the valve arm 50 to the valve 4.
Turn the hydraulic cylinder 2 clockwise around 9.
0 switching valve 49 is switched. Then, oil is sent to the hydraulic cylinder 20, and the piston 21
extends and moves the washer 23 to the left as shown in Fig. 2, and the shaft attachment 2
The link rod 24 and the rotation rod 27 are rotated clockwise around the 6th part, the wheel transmission case 14 is rotated downward via the rod 28, the wheel 17 is lowered, and the frame 1 is moved upward to take a turning position. . At this time, when the valve arm 50 is rotated clockwise by the cutting action of the planting clutch lever 56,
Clockwise rotation of the valve arm 50 causes the relay rod 48 at the rotating end to move to the right, and conversely, the relay rod 48 → tube 44 → rod 43 → rotating arm 41 → rotating shaft 37 → engaging rod 39. Interlockingly, the engaging rod 39 is rotated upward. When the balance rod 36 moves up and rotates, the arms 33, 3
3' and rods 31, 31' to move both the left and right floats 8, 8' upward together, but
Since the engagement rod 39 is located away from the center of gravity of the balance rod 36, only the side of the balance rod 36 opposite to the center of gravity (the arm 33 side in this embodiment) is pushed up, and the other side is not moved upward. Therefore, when the engaging rod 39 moves upward, the arm 33 closer to the engaging rod 39 is pushed up, but the arm 33' farther from the engaging rod 39 is not moved upward. Therefore, the force that rotates the valve arm 50 clockwise due to the cutting action of the planting clutch lever 56 is
Float 8 on the arm 33 side closer to the engagement rod 39
It can be operated easily by moving the only part upward. (Effect) Conventionally known Utility Model Application Publication No. 57-135218 discloses a frame to which an engine is attached, a wheel transmission case whose front end is pivoted to the frame and whose rear end can move up and down, and the wheel transmission case. A single wheel attached to the rear end of the case, a walking steering handle attached to the rear of the frame, a seedling tank provided in front of the walking steering handle, and a seedling tank installed below the seedling tank. a planting rod, a left and right float that is pivoted to the frame side and whose front end moves up and down depending on the depth and shallowness of the paddy field, and a switching valve provided on the frame side that is switched by the up and down movement of the front end of the left and right float; It consists of a hydraulic cylinder provided on the frame side that expands and contracts when a switching valve is switched to move the wheels up and down, and the switching valve is connected to the manual lever and the switching valve so that it can also be switched by operating a manual lever. The structure is shown, and a known example is that when the entire aircraft sinks when it reaches a deep place in a rice field,
The front side of the float is lifted by water pressure, and when the front side of the float rises, the switching valve is switched to extend the hydraulic cylinder, and the wheels are moved down to raise the frame side to prevent deep planting.When turning at the end of the field, The planting rod clutch is disconnected to interrupt planting, and then the switching valve of the hydraulic system for moving the wheels up and down is switched using the manual operation lever to lower the wheels and turn. However, the problem with this structure is that the manual operation lever The problem is that the switching valve is difficult to operate. That is, since the switching valve is switched by the vertical movement of the float, when the switching valve is switched by the manual operation lever, the left and right floats are also lifted up in conjunction. However, the present invention includes a frame 1 to which the engine 2 is attached, a wheel transmission case 14 whose front end is pivoted to the frame 1 and whose rear end is movable up and down, and a wheel transmission case 14 that is attached to the rear end of the wheel transmission case 14. single wheel 1
7, a walking steering handle 4 attached to the rear of the frame 1, a seedling tank 5 provided in front of the walking steering handle 4, and a planting rod provided below the seedling tank 5; Left and right floats 8, 8' are fixed to the frame 1 side and whose front ends move up and down depending on the depth and shallowness of the paddy field, and the left and right floats 8,
a switching valve 49 provided on the frame 1 side that is switched by vertical movement of the front end of the switching valve 4;
a hydraulic cylinder provided on the side of the frame 1 that expands and contracts by switching 9 to move the wheels 17 up and down; and a planting clutch lever provided on the walking control handle 4 that opens and closes the planting clutch of the planting rod. 56
In the one-wheel type rice transplanter comprising:
and the switching valve 49, and when the planting clutch lever 56 side is operated to switch the switching valve 49, the left and right floats are connected between the left and right floats 8, 8' and the switching valve 49. Since this is a hydraulic switching device for a single-wheel rice transplanter equipped with a one-sided lifting mechanism in which only one of the floats 8 and 8' is moved upward, the switching valve is operated by operating the planting clutch lever 56 side. 49
When switching, in the embodiment of the one-sided upward movement mechanism,
Since the engagement rod 39 is off the center of gravity of the balance rod 36, when the engagement rod 39 moves upward, only the arm 33 closer to the engagement rod 39 is pushed up, and the arm 33' farther from the engagement rod 39 is pushed up. does not push up, so
Only the float 8 on one side needs to be moved upward, making it extremely easy to operate.

[Brief explanation of the drawing]

FIG. 1 is a side view of the whole, FIG. 2 is a side view of the main parts, FIG. 3 is a plan view of the main parts, and FIG. 4 is a plan view of the whole. Explanation of symbols, 1... Frame, 2... Engine, 3... Planting transmission case, 4... Handle for walking operation, 5... Seedling tank, 6... Sliding tool, 7...
Sliding tool, 8, 8'...left and right floats, 9...shaft mounting,
10...Mounting rod, 11, 11'...Shaft, 12...
Long hole, 13... pin, 14... wheel transmission case,
15...Axle mounting, 16...Axle, 17...Wheel, 1
8... Projection piece, 19... Shaft, 20... Hydraulic cylinder, 21... Piston, 22... Spring, 23...
Washer, 24... Link rod, 25... Shaft attachment, 26...
... Pivot mounting, 27 ... Rotating rod, 28 ... Rod, 29
... shaft mounting, 30 ... shaft mounting, 31, 31' ... rod, 32, 32' ... shaft mounting, 33, 33' ... arm, 34, 34' ... shaft mounting, 35, 35'... ...Long hole, 36... Balance rod, 37... Rotation shaft, 38,3
8'... shaft mounting, 39... engaging rod, 40... tube, 4
1...Rotating arm, 42...Elongated hole, 43...Rod, 44...Cylinder, 45...Spring, 46...Washer,
47... Spring, 48... Relay rod, 49... Switching valve, 50... Valve arm, 51... Rod, 52... Arm, 53... Rotating shaft, 54...
Arm, 55...wire, 56...planting clutch lever, 57...seedling, 58...support rod.

Claims (1)

[Claims] 1 A frame 1 to which an engine 2 is attached, a wheel transmission case 14 whose front end is pivoted to the frame 1 and whose rear end is movable up and down, and a single-wheel type wheel attached to the rear end of the wheel transmission case 14. 17, and a walking steering handle 4 attached to the rear position of the frame 1.
, a seedling tank 5 provided on the front side of the walking steering handle 4, a planting rod provided at a lower position of the seedling tank 5, and a planting rod fixed to the frame 1 side, and the front end is vertically fixed depending on the depth and shallowness of the paddy field. Moving left and right floats 8,
8', a switching valve 49 provided on the frame 1 side that is switched by the vertical movement of the front ends of the left and right floats 8, 8', and the frame that expands and contracts by switching the switching valve 49 to move the wheels 17 up and down. In a one-wheel rice transplanter comprising a hydraulic cylinder provided on one side and a planting clutch lever 56 provided on the walking control handle 4 for turning on and off the planting clutch of the planting rod, the switching valve 49 is The planting clutch lever 56 and the switching valve 4 are configured to be switched by turning on/off the planting clutch lever 56.
9, and when the planting clutch lever 56 side is dry and the switching valve 49 is switched, the left and right floats 8, 8 are connected between the left and right floats 8, 8' and the switching valve 49. Hydraulic switching device for a single-wheel rice transplanter equipped with a one-sided lifting mechanism in which only one float moves up.