JPH0233627Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a manual operating device for a hydraulic wheel up-and-down mechanism in a rice transplanter.

Conventionally, an automatic wheel vertical adjustment device for a rice transplanter detects approach and separation of a body frame from a float while the machine is running, and moves the machine propulsion wheels up and down using a hydraulic system. This type of device is equipped with a hydraulic pump operated by receiving power from the engine, an oil tank, a hydraulic cylinder that moves the aircraft propulsion wheels up and down, a hydraulic valve that detects the approach and separation of the float from the aircraft frame, etc. The vertical adjustment is performed either automatically or manually, and the machine that is in the automatic adjustment state can be placed on the headland during planting work.
When making a 180° direction change, it is necessary to stop the planting operation, switch the hydraulic pressure from automatic adjustment to manual adjustment, move the wheels down, and fix the aircraft in the up position before performing the turning operation. There was a need for efficient and smooth operation.

The present invention was devised to meet the above-mentioned demands, and in particular, the main link plate fixed to the valve shaft of the hydraulic valve is connected to one end of the sub link plate rotatably mounted on the fuselage. The other end of the sub-link plate is interlocked and connected to the manual operation mechanism, and the distance from the rotation fulcrum of the sub-link plate to the engagement position with the main link plate is manually operated from the rotation fulcrum. By forming the valve shaft to be larger than the distance to the starting end of the mechanism and by setting the position of the valve shaft between the rotation fulcrum and the engagement position, the amount of operation of the manual operation mechanism can be reduced. This makes it possible to quickly and easily adjust the wheels up and down during turning work, and also increases the distance between each port of the hydraulic valve so that the valve shaft can be rotated by a large amount even if the amount of operation is small. The present invention aims to provide a manual operating device for a hydraulic wheel up-and-down mechanism in a rice transplanter, which is capable of smoothly and reliably switching hydraulic valves during manual operation.

The structure of the present invention will be described with reference to an embodiment shown in the drawings. Reference numeral 1 denotes a fuselage frame, and an engine base 2 is integrally extended from the front part of the fuselage frame 1. Reference numeral 3 denotes a float, whose rear part is pivotally supported by a bracket 4 to the rear part of the fuselage frame 1 so as to be freely rotatable in the vertical direction, and whose front part is supported by a bendable arm 5. The front part of the float 3 can move up and down toward and away from the fuselage frame 1. 6 is an engine, and the engine 6 is mounted on the engine base 2. 7 is a transmission whose input shaft receives power from the engine 6 through a transmission belt 8. Chain cases 9, 9 extending rearward are attached to the left and right ends of the output shaft of the transmission 7 so as to be rotatable in the vertical direction. Wheels 10, 10 are pivotally supported, and power is transmitted from the transmission 7 to the left and right fuselage propulsion wheels 10, 10 by a chain transmission mechanism in chain cases 9, 9. 11 is a driving operation handle; 12 is a seedling stand;
is reciprocated left and right by a drive mechanism inside the drive case 13. 14 is a seedling planting interlocking body.

The hydraulic system that moves the body propulsion wheels 10, 10 up and down includes a hydraulic control section 15 and a hydraulic operation section 16. The hydraulic control section 15 is the hydraulic valve 1
7. It is mainly composed of a hydraulic pump 18 and an auxiliary oil tank 19, and also has a hydraulic operating section 16.
The main components are a hydraulic cylinder 20 and a main oil tank 21. and,
The hydraulic valve 17 of the hydraulic control unit 15 is linked to the front movable side of the float 3, and the hydraulic cylinder 20 is connected to chain cases 9, 9.

That is, the valve shaft 2 of the hydraulic valve 17
A link 23 is rotatably supported on 2,
One end of this link 23 engages with one end of a main link plate 24 fixed to the valve shaft 22, and the other end of the link 23 is connected to the front movable side of the float 3 by a rod 25, and is attached to the fuselage frame. Hydraulic valve 17 due to the approach and separation of float 3 from 1
is starting to work. The upper end of the rod 25 is provided with a telescopic adjustment mechanism 25' using a screw.

A sub-link plate 27 rotatably supported on a support shaft 26 is located on one side of the main link plate 24, and the sub-link plate 27 has an engaging pin 28 that protrudes inward. The engagement pin 28 engages with an elongated hole 29 formed at the other end of the main link plate 24. Other parts of the sub link plate 27 are linked to the manual operation lever 31 of the driving operation handle 11 via an interlocking wire 30 and the like. Interlocking wire 3
0 and the sub-link plate 27 is a plate 3 having a long hole.
2, so that when the manual operation lever 31 is in the automatic adjustment position A, the operation of the hydraulic valve 17 is not hindered by the approach and separation of the float 3 from the fuselage frame 1. ing. As shown in FIG. 2, the distance from the support shaft 26 of the sub-link plate 27 to the engagement pin 28 is larger than the distance from the support shaft 26 to the connection position with the plate 32, and the valve shaft 22 is It is located between the support shaft 26 and the engagement pin 28. Interlocking wire 30 and plate 32
A telescopic adjustment portion 32' is provided at the joint portion.
52 is an operation panel for the manual operation lever 31.
B is the fixed position of the manual operation lever 31, C is the raised position, and D is the lowered position. The above secondary link board 27
is the outermost part of the operating part of the hydraulic valve 17, the link 23, the main link plate 24, etc., and the sub link plate 2
7 has a shape that broadly covers one side of them,
The inner part is mud-proof and waterproof. A pulley 34 is attached to the rotating shaft 33 of the hydraulic pump 18.
A transmission belt 8 between the engine 6 and the transmission 7 is suspended on the pulley 34, and is continuously rotated while the engine 6 is in operation.

The main link plate 24 fixed to the valve shaft 22 of the hydraulic valve 17 has a straight portion 2 in a part thereof.
4' is formed, and the hydraulic valve 17 is positioned so that its straight portion 24' is parallel to the surface of the engine base 2 and the valve position of the hydraulic valve 17 is neutral.

The hydraulic cylinder 20 in the hydraulic operating section 16 has a ram 35, and at the tip of the ram shaft 36 of the ram 35 there is a slide boss 3 pivotally connected to the left and right intermediate portions of a horizontal arm 37 with a pin 38'.
8 is slidably inserted therein, and a cushion spring 40 is interposed between the slide boss 38 and the ram 35. The left and right ends of the horizontal arm 37 are connected by rods 41, 41, respectively, to arms 42, 42, which are integral with the left and right chain cases 9, and in the direction in which the ram 35 is pushed out from the cylinder 20. Aircraft propulsion wheel 1
0 and 10 are lowered, and the rams 35 are configured to rise in the direction in which the ram 35 is drawn into the cylinder 20, respectively. 43 is a spring that prevents the ram 35 from being pulled out by wheel reaction force, and 44 is its guide. A stopper hole 45 is bored in one side of the horizontal arm 37, and a stopper pin 46 that engages and disengages from the stopper hole 45 allows the height adjustment stopper mechanism 47 of one of the fuselage propulsion wheels 10 to be adjusted. It is configured. The stopper pin 46 is interlocked with a manual operating lever 49 of the driving operation handle 11 via an interlocking wire 48.

The hydraulic operating section 16 is located near the axle of the vehicle propulsion wheels 10, 10 on the vehicle frame 1, and the hydraulic control section 15 is located on the engine base 2. The hydraulic operating section 16 is the hydraulic control section 15.
located higher and therefore the main oil tank 2
1 is located at a higher position than the auxiliary oil tank 19. The reason why the hydraulic actuator 16 is located near the axle of the aircraft propulsion wheels 10, 10 is to maintain the weight balance in the longitudinal direction of the aircraft, since the hydraulic cylinder 20 and main oil tank 21 that make up the hydraulic cylinder 20 and the main oil tank 21 are heavy. In addition, the hydraulic control unit 15 is installed on the engine base 2 at a low position because the hydraulic pump 1
The hydraulic valve 17 is moved closer to the engine 6, the power source of the float 3, to simplify the transmission mechanism.
This is to simplify the interlocking mechanism and increase the reliability of operation by moving it closer to the movable side. Main oil tank 21 in a high position and auxiliary oil tank 19 in a low position
A communicating oil passage 50 formed by a pipe is formed between them, and the hydraulic cylinder 20 and the hydraulic valve 17 are connected by a pipe 51. In the hydraulic control section 15, an auxiliary oil tank 19, an oil pump 18,
A hydraulic circuit is formed between the hydraulic valves 17.
The hydraulic valve 17 has a valve position 17a that connects the output side of the hydraulic pump 18 to the auxiliary oil tank 19 and closes the hydraulic cylinder 20;
Valve position 1 that communicates the output side of with the hydraulic cylinder 20
7b, and a valve position 17c that communicates the output side of the hydraulic pump 18 with the auxiliary oil tank 19 and the hydraulic cylinder 20 with the auxiliary oil tank 19, and the relative positional relationship of the float 3 with respect to the body frame 1 is as follows. , when the float 3 is in the neutral state, the hydraulic valve 17 is at the valve position 17a, and the float 3 is at the valve position 17a.
valve position 17b at the position where the valve approaches the fuselage frame 1.
The valve position 17c is at the position where the valves are separated from each other. Further, in relation to the manual operation lever 31, the valve position is 17a at the neutral position B, the valve position 17b at the raised position C, and 17C at the lowered position D, and the valve can be switched manually. As is clear from the changes in the main link plate 24 shown in Figures 2 and 8, the spacing between the ports of the hydraulic valves is set larger than that in automatic operation, and the distance between the hydraulic valve ports in manual operation is larger than that in automatic operation. Switching and fixing to neutral can be performed smoothly and reliably.

Next, the operation of the present invention constructed as described above will be explained. In a rice field, the rice transplanter has its float 3 in contact with the rice field, and the machine propulsion wheels 10, 10
The machine is supported by both the rice field and the tiller with the machine reaching the tiller surface, and the machine propulsion wheels 10,1
The float 3 slides on the rice field and moves forward due to the propulsive force generated by the rolling of the float 3 on the rice plow surface. and,
As this aircraft moves forward, seedlings are planted on the rice fields.

As mentioned above, the manual operation lever 31 is moved to the automatic position A.
At this time, when the relative positional relationship of the float 3 to the fuselage frame 1 is in a neutral state, the valve position of the hydraulic valve 17 is at 17a and the hydraulic cylinder 20 is closed, so the ram 35 of the hydraulic cylinder 20 is in an immobile state, Aircraft propulsion wheel 1 connected to this
0 and 10 are in a state where they cannot move up and down, that is, they are integrated with the fuselage frame 1, but in rice fields,
The float 3 is in contact with the rice field, and the aircraft propulsion wheel 1
This corresponds to the state in which 0 and 10 have reached the tiller surface. By the way, if the surface of the tiller is uneven or has undulations, the depth from the field surface to the tiller surface changes.
moves away from the plowing surface, so the machine frame 1 descends and tries to approach the float 3. Conversely, when the depth becomes shallow, the machine propulsion wheels 10, 10 push the plowing surface, so the machine frame 1 rises. Trying to move away from float 3. In the former case, the valve position of the hydraulic valve 17 that is linked to the float 3 is switched from 17a to 17b, so the output side of the hydraulic pump 18 is connected to the hydraulic cylinder 20, and the pressure inside the hydraulic cylinder 20 is Oil is supplied and the ram 35 is moved in the direction of pushing out the ramshaft 36. Therefore, the left and right chain cases 9, 9 are rotated downward via the horizontal arm 37 and rods 41, 41, the machine propulsion wheels 10, 10 are moved downward and reach the plowing surface, and the machine frame 1 is rotated downward. It rises while being supported by the plowing surface via the propulsion wheels 10, 10, but when the relative position between the float 3 and the fuselage frame 1 returns to the neutral state, the hydraulic valve 17
The valve position returns to 17a, and the fuselage propulsion wheels 10, 10 supported by the hydraulic cylinder 20 become immobile and integrated with the fuselage frame 1. In the latter case, the valve position 17a of the hydraulic valve 17 may be
7c, the hydraulic cylinder 20 is communicated with the auxiliary oil tank 19, the supporting action of the ram 35 in the hydraulic cylinder 20 is canceled, and the ram 35 becomes movable in the direction in which the ram shaft 36 is retracted. Therefore, the machine frame 1 is lowered by the load while the machine propulsion wheels 10, 10 are in contact with the plowing surface, and when the relative position of the machine frame 1 with respect to the float 3 returns to the neutral state, the hydraulic valve 1
The valve position of valve 7 returns to 17a, and the fuselage propulsion wheels 10, 10 supported by the hydraulic cylinder 2 become immobile and integrated with the fuselage frame 1. As shown in the hydraulic valve switching operation diagram in FIG. 8, these automatic adjustment operations are performed because the valve positions 17b and 17c for raising and lowering the neutral position 17a are arranged close to each other. The relative position of the body frame 1 with respect to the float 3 can always be maintained at an appropriate position quickly and efficiently. Further, since the output side of the hydraulic pump 18 is connected to the auxiliary oil tank 19, the pressure oil flow generated by the continuously operating hydraulic pump 18 circulates between the hydraulic pump 18 and the auxiliary oil tank 19.

On the other hand, when driving on the road or turning a headland during planting work, if the manual operation lever 31 is placed in the neutral position B, the valve position of the hydraulic valve 17 is switched to 17a, regardless of the automatic adjustment operation described above. Well,
The hydraulic cylinder 20 is in a closed state, and the aircraft propulsion wheels 10, 10 are in an immobile state, and when the manual operation lever 31 is placed in the raised position C, the hydraulic valve 1 is closed.
When the valve position of No. 7 is at 17b and lowered position D, the valve position is switched to 17c, and the aircraft propulsion wheels 10, 10 move up and down, respectively. Since the operation of the manual operation lever 31 is magnified by the sub link plate 27 and transmitted to the main link plate 24, even if the operation of the manual operation lever 31 is slight during manual adjustment, the valve shaft 22 Since the hydraulic valve 17 is configured to be rotated by a large amount, it is possible to increase the interval between the valve positions sandwiching the manual neutral position, and there is no risk of oil leakage due to positional deviation of the hydraulic valve 17. Therefore, when turning on a headland, etc., it is possible to manually hold the aircraft at an appropriate height, and the steering operation can be performed smoothly, and since the operation of the manual operation lever 31 is small, these switching operations are easy. It can be done quickly and easily.

The main oil tank 21 and the auxiliary oil tank 19 are communicated with each other by the communication oil passage 50, and the main oil tank 21 is located at a higher position than the auxiliary oil tank 19, so the auxiliary oil tank 19 is always connected to the main oil tank. Oil can be supplied from 21, and the auxiliary oil tank 19 is always full. When the oil pressure in the auxiliary oil tank 19 rises abnormally, the oil in the auxiliary oil tank 19 is pushed back to the main oil tank 21 through the communication oil passage 50, and the oil pressure in the auxiliary oil tank 19 returns to a normal oil pressure state. maintained.

Each valve position 17a, 17b, 17 of the hydraulic valve 17
c, the positional relationship of the float 3 with respect to the fuselage frame 1, and the relationship between the operating positions A, B, C, and D of the manual operation lever 31, so-called valve timing, which must be maintained appropriately at all times. As described above, the main link plate 24 fixed to the valve shaft 22 of the hydraulic valve 17 has a straight portion 24', so when the manual operation lever 31 is in the fixed position A, the main link plate 24 is fixed to the valve shaft 22 of the hydraulic valve 17.
Adjust the expansion/contraction adjustment part 32' between the interlocking wire 30 and the plate 32 so that the straight part 24' is parallel to the engine base 2, and then, in that state, the float 3 is placed at a predetermined distance from the fuselage frame 1. By adjusting the expansion/contraction adjustment mechanism 25' of the rod 25 so that the valve timing is adjusted, the so-called valve timing can be easily and accurately adjusted.

In short, the present invention is equipped with a float attached to the front of the aircraft frame so that it can move up and down and away from it, and a propulsion wheel that is attached to the front of the aircraft frame so that it can be moved up and down via a hydraulic device, and a rotary hydraulic switching system for the hydraulic device. In a rice transplanter that is linked to the movable side of the float and the manual operation mechanism through the required links to the valve shaft of the valve, the main link plate fixed to the valve shaft is rotatably attached to the body of the rice transplanter. The other end of the sub link plate is interlocked with the manual operation mechanism, and the distance from the rotation fulcrum of the sub link plate to the engagement position with the main link plate is determined by the rotation of the sub link plate. Since the distance from the fulcrum to the starting end of the manual operating mechanism is larger than the distance from the fulcrum to the starting end of the manual operating mechanism, and the position of the valve shaft is set between the rotation fulcrum and the engagement position, the manual operating lever is By reducing the amount of operation, it is possible to quickly and easily adjust the wheels up and down when turning on a headland, etc., and it is also possible to rotate the valve shaft by a large amount even with a small amount of operation of the operation lever, It is said that the spacing between each port of the hydraulic valve during manual operation can be increased, and hydraulic valve switching during manual operation can be performed smoothly and reliably without particularly increasing the operating range of the manual operation lever. This has extremely useful practical effects.

[Brief explanation of the drawing]

The drawing shows one embodiment of the automatic wheel vertical adjustment device in the rice transplanter according to the present invention, and shows the first embodiment of the automatic wheel vertical adjustment device in the rice transplanter according to the present invention.
The figure is an overall side view of the rice transplanter, FIG. 2 is a side view of the hydraulic control section, FIG. 3 is a plan view of the same as above, FIG. The figure is a plan view showing a part of the same as above, FIG. 7 is a side view showing a part of the same, FIG. FIG. 9 is a hydraulic circuit diagram of the hydraulic control section and the hydraulic operation section. In the figure, 1 is the fuselage frame, 2 is the engine base, 3 is the float, 4 is the bracket, 5 is the telescopic arm, 6 is the engine, 7 is the transmission, 8 is the transmission belt, 9, 9 is the chain case, 10, 10
1 is a machine propulsion wheel, 12 is a seedling platform, 14 is a seedling planting movement body, 15 is a hydraulic control unit, 16 is a hydraulic operating unit, 1
7 is a hydraulic valve, 18 is a hydraulic pump, 19 is an auxiliary oil tank, 20 is a hydraulic cylinder, 21 is a main oil tank, 22 is a valve shaft, 24 is a main link plate, 24' is a straight part thereof, 25 is a rod, 2
5' is its telescopic adjustment mechanism, 26 is its spindle, 27 is a sub link plate, 30 is an interlocking wire, 31 is a manual operation lever, 32 is a plate, 32' is its telescoping adjustment part,
35 is a ram, 37 is a horizontal arm, 41, 41 are rods, 50 is a communicating oil passage, and 51 is a connecting pipe.

Claims (1)

[Scope of utility model registration request] It is equipped with a float attached to the front of the aircraft frame so that it can move up and down and away from it, and a propulsion wheel that is attached so that it can be moved up and down via a hydraulic device, and the required link etc. to the valve shaft of the rotary hydraulic switching valve of the hydraulic device. In a rice transplanter that is linked to the movable side of the float and the manual operation mechanism through The other end of the link plate is interlocked and connected to the manual operation mechanism, and the distance from the rotation fulcrum of the sub link plate to the engagement position with the main link plate is determined from the rotation fulcrum to the starting end of the manual operation mechanism. manual operation of a hydraulic wheel up-and-down mechanism in a rice transplanter, characterized in that the valve shaft is formed to be larger than the distance above, and the position of the valve shaft is set between the rotation fulcrum and the engagement position. Device.