JPS6245537Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a riding rice transplanter comprising, for example, a planting section having a seedling stand and planting claws, and a riding section constituted by an agricultural tractor or a traveling vehicle exclusively for rice planting. Conventionally, in a walk-behind rice transplanter, there is a technology in which a hydraulic cylinder and a valve are provided to move the wheels that support the machine body in and out from below, and a rod-shaped body that switches the valve is connected to a float using a spring structure (for example, Japanese Utility Model No. 52-132821 However, the conventional technology detects the depth of the tiller on which the wheels are moved and adjusts the supporting height of the machine body, and is not suitable for passenger cars in which the planting part is supported independently of the passenger part. In the rice transplanter,
Depending on the weight of the planting area and the weight of the seedlings placed on it,
It is necessary to set a standard value for the supporting capacity of the planting area, which makes it difficult to properly support the planting area by dealing with synergistic changes in the weight of seedlings at the planting area and the hardness of the planted field surface. Even in fields where the planting depth is constant, the planting depth may change continuously.
This method had the disadvantage of making the operation to maintain a constant planting depth complicated.

The present invention solves the above-mentioned conventional drawbacks, and includes installing a planting section in the riding section so that it can be raised and lowered via an elevating link and a hydraulic cylinder, and a float that is grounded on the planting field surface and supports the planting section. The rice transplanter is equipped with a back pressure regulating valve that is operated by a deforming force of the lifting link that is proportional to a change in the amount of seedlings in the planting section, and
A spring is provided to set an operating force for switching the valve that controls the hydraulic cylinder according to a change in the support force of the planting section, and the reference value of the support force of the planting section that acts on the elevating link is determined by the spring of the spring. This is set by force, and can maintain the planting depth approximately constant by dealing with the weight of the seedlings at the planting area and the hardness of the planting field, and prevents changes in the planting depth due to seedling succession, etc. It is possible to stably support the float on the ground, stabilize the support posture of the planting section by the lifting link, and properly obtain the valve switching operation due to changes in the weight of the seedlings at the planting section. It is an object of the present invention to provide a float ground load adjustment device for a rice transplanter in which the attachment part can always be mounted on the riding part via an elevating link with an appropriate supporting force.

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

Fig. 1 is a schematic side view of the riding rice transplanter, and Fig. 2 is a plan view of the same.
Reference numeral 5 denotes a connecting frame that connects the front and rear vehicle bodies 2 and 3 so as to be bendable only in the horizontal direction via a pivot shaft 6;
7 and 8 are front and rear wheels for paddy fields that are attached to the left and right sides of the front and rear vehicle bodies 2 and 3 via swing cases 9 and 10;
12 is a spare seedling stand supported by the pillar 11; 13 is a driver's seat attached to the upper rear part of the front vehicle body 2 via the pillar 11; 14 is the driver's seat 13; 15 is a lift lever for operating the switching valve 14; 16 is a steering handle provided above the front of the front body 2; and 17 is an engine mounted on the rear body 3.

In addition, 18 in the figure is a planting part for six rows that is installed in the front part of the front vehicle body 2 via a three-point linkage mechanism 19 so as to be able to be raised and lowered, and 20 is a planting part that can be moved back and forth from side to side. A seedling platform 21 is a planting claw for taking out one seedling from the seedling platform 20 and planting it; 22 is a transmission case to which the seedling platform 20 and the planting claw 21 are attached;
3 is a float supporting the transmission case 22; 24;
2 is a front bumper attached to the transmission case 22;
5 is a fixed frame that supports each transmission case 22...
The seedling stand 20 and the planting claws 21 are appropriately driven via the PTO transmission shaft 26 to continuously plant seedlings.

The three-point link mechanism 19 consists of a pair of lower links 27 and a top link 28. One end of the lower link 27 is pivotally attached to the lower surface of the front vehicle body 2 via a pin 27'', and the other end of the lower link 27 is attached to the lower end of the fixed frame 25 with a pin 27'. At the same time, a pin 2 is attached to the upper end of the fixed frame 25.
A back pressure regulating valve 29 is connected to the other end of the top link 28, which is connected to the other end of the top link 28 through a pin 31. Said fixed frame 2
5 A horizontal vibration prevention spring 32 is installed between the lower end and the bracket 30.
At the same time, a lift arm 33 with one end protruding forward of the front vehicle body 2 is connected to the middle of the lower link 27 via a connecting rod 34, and the lift arm 33 is swung by hydraulic pressure as appropriate to move the planting portion 18. It is configured to move up and down.

As shown in FIG. 3, the long hole 3 at the lower end of the connecting rod 34 is inserted into the planting pin 35 on the intermediate side surface of the lower link 27.
6 is engaged, and a spring 37 is stretched between the lower link 27 and the lift arm 33 in parallel with the connecting rod 34, and the float 23 is placed in the field under a standard load state with a certain amount of seedlings placed on the seedling stand 20. The float 23 is formed to sink to a certain depth on the surface so that the grounding pressure of the float 23, that is, the grounding load of the float 23 and the tension spring force of the spring 37 are balanced. Further, a piston rod 38' of a hydraulic cylinder 38 attached to the front vehicle body 2 is connected to the lift arm 33. A hydraulic pump 39 that is linked to the engine 17 is communicated with the cylinder 38 via the 4-port 3-position manual hydraulic switching valve 14, so that the cylinder 38 rotates the lift arm 33 upward, and the pump 39 The lift arm 33 is fixedly supported by communicating with the oil tank 40 via the switching valve 14 and the back pressure adjustment valve 29, and the pump 39 is connected to the tank 40 via the switching valve 14 and the valve 29, and its A variable throttle valve 4 is connected between the switching valve 14 and the valve 29.
1 and a cylinder 38 via the switching valve 14, the lift arm 33 is configured to be rotated up and down via the cylinder 38 in accordance with the opening and closing of the valve 29.

As shown in FIG. 4, the top link 28 is
It includes a core shaft 42 and a cylindrical shaft 43 into which the core shaft 42 is slidably inserted, and a spring pressure adjustment screw 44 is screwed onto the end of the cylindrical shaft 43 from which the core shaft 42 protrudes. A spring seat 45 is fixed to the inner end of the
A float ground pressure adjustment spring 46 is stretched between the screw 44 and the spring seat 45. A coupling bolt 47 is fixed to the outer end of the core shaft 42, and the bolt 47
The core shaft 42 is connected to the fixed frame 25 via. A screw 48 connects the cylinder shaft 43 to the back pressure adjustment valve 29.
The operating shaft 49 of the valve 29 is slidably inserted into the screw 48, and one end of the shaft 49 is brought into contact with the inner end of the core shaft 42. A pressure reducing valve 51 is provided at the other end via a pressure reducing spring 50. A high-pressure oil passage 52 and a low-pressure oil passage 53 are formed in the valve 29, and the high-pressure oil passage 52 is communicated with the switching valve 14 and the throttle valve 41, and the low-pressure oil passage 53 is communicated with the tank 40. oil road 5
Connecting bolt 54 to the end of valve 29 near 2,53
is fixed, and the end of the valve 29 is connected and supported to the bracket 30 of the front vehicle body 2 via the bolt 54. A pressure reducing valve 51 is incorporated in order to control the communication of the high pressure oil pipe 52 with the low pressure oil pipe 53, and the low pressure oil pipe 5
3 and the back pressure chamber 55 of the pressure reducing valve 51 is formed in the valve 51, and the oil passages 52 and 53 are communicated with each other by a bypass oil passage 57, and the adjustment release lever 59 The bypass oil passage 57 is controlled to open and close by the load adjustment release valve 58 having a load adjustment release valve 58, and the planting section 18 is raised and lowered by increasing and decreasing the float ground load due to changes in the amount of seedlings on the seedling platform 20 and the ground pressure of the float 23. It is formed in such a way that it

The present invention is constructed as described above, and as shown in FIG. Valve 1
4 and valve 29 to the lifting cylinder 38.
1 and the switching valve 14, and the float 2
3 automatically adjusts the ground load of the float 23.
When the ground pressure is at the set value, the pressure oil discharged from the hydraulic pump 39 is returned to the tank 40 via the pressure reducing valve 51, and a constant hydraulic pressure is applied to the lifting cylinder 38 via the throttle valve 41. , the planting section 18 is maintained at a constant height.

Furthermore, if the surface of the field where rice planting is to be performed is relatively soft, screw out the spring pressure adjustment screw 44 and move it in the direction of the dashed arrow in FIG. 4 to adjust the compression spring force of the float ground pressure adjustment spring 46. is weakened, the reference value of the float grounding load is reduced, and the grounding pressure of the float 23 is reduced to prevent the float 23 from pushing mud. If the surface of the field is relatively hard, insert the screw 44 and move it in the direction of the solid line arrow in FIG. 4 to increase the compression spring force of the spring 46 and set the float ground load as By increasing the ground pressure of the float 23, the mud leveling action of the float 23 is fully activated.

During rice planting work, for example, if the seedling platform 20 is replenished with spare seedlings and the seedling platform 20 becomes heavy due to an increase in the number of seedlings, the spring 37 can be extended by lowering the pin 27'' as a fulcrum. The link 27 rotates, displacing the seedling stand 20 in the direction of tilting it down, retracting the core shaft 42 and the operating shaft 49, increasing the spring pressure of the pressure reducing spring 50, and increasing the throttle oil pressure of the pressure reducing valve 51. Pressure oil from the pump 39 is applied to the cylinder 38 via the throttle valve 41, and the lower link 27 is rotated upward in the direction of raising the lift arm 33 and raising the seedling stand 20.
When the hydraulic pressures of the cylinder 38 and the pressure reducing valve 51 are balanced, that is, when the ground pressure of the float 23 is reduced and returned to the set pressure, the cylinder 38 stops and supports each link 27, 28 in a fixed state, Continuing rice planting work at a constant planting depth.

On the other hand, if the seedling platform 20 becomes lighter due to a decrease in the amount of seedlings loaded on the platform 20, the spring 3
The lower link 27 rotates with the pin 27'' as a fulcrum in the direction of contracting the seedling stand 20, and moves the core shaft 42 and the operating shaft 49 forward against the spring 46, thereby reducing the pressure reducing spring 50. The spring pressure is weakened to lower the throttle oil pressure of the pressure reducing valve 51, the pressure oil in the cylinder 38 is returned to the tank 40 via the throttle valve 41 and the pressure reducing valve 51, and the lift arm 33 is rotated downward to lower the seedling stand 20. Lower link 27 is rotated downward in the direction of collapse, and cylinder 38
When the hydraulic pressure of the pressure reducing valve 51 is balanced, that is, when the ground pressure of the float 23 is increased and returned to the set pressure, the cylinder 38 is stopped and the rice planting operation is continued at a constant planting depth.

Furthermore, when the weight of the seedlings on the seedling platform 20 and the force of the spring 37 are balanced, for example, if the field becomes deep and the float 23 is pushed up by muddy soil, and the ground pressure of the float 23 becomes high, the pin 27 ' is the fulcrum and the seedling stand 20 is displaced in the direction of falling down, the core shaft 42 is retracted in the same way as the weight increase of the seedling stand 20 described above, and the lift arm 43 and lower link 27 are rotated upward via the cylinder 38. Seedling stand 20
is displaced in the direction of standing up, the hydraulic pressure of the cylinder 38 and the pressure reducing valve 51 are balanced, the ground pressure of the float 23 is returned to the set value, and rice planting work is continued at a constant planting depth.

On the other hand, when the field becomes shallow and the float 23 descends and the ground pressure of the float 23 becomes low, the seedling stand 20 is displaced in the direction of standing up using the pin 27' as a fulcrum, and the weight of the seedling stand 20 is Similarly to the reduction, the core shaft 42 is advanced against the spring 46, the pressure oil in the cylinder 38 is returned to the tank 40, the lift arm 33 and the lower link 27 are rotated downward, and the seedling stand 20 is displaced in the direction of falling down. Then, the hydraulic pressure of the cylinder 38 and the pressure reducing valve 51 are balanced, the ground pressure of the float 23 is returned to the set value, and the rice planting operation is continued at a constant planting depth.

In addition, as shown by the imaginary line in FIG.
A switching valve 60 is provided to short-circuit between 9 and the oil tank 40, and the switching valve 60 is used in place of the release valve 58,
The adjustment operation by the pressure reducing valve 51 can be canceled. The spring 37 is formed into an absorber type using a pair of tension and compression springs, and balances the tension and compression springs when a certain amount of seedlings are placed on the seedling stand 20, and responds to changes in the number of seedlings. to expand and contract the tension and compression springs respectively,
The core shaft 42 can also be moved forward and backward.

Furthermore, FIG. 5 is a cross-sectional side view of the main part showing another embodiment, and FIG. 6 is a plan external view of the same.
The top link 28', which is an elevating link connected to the upper end of the fixed frame 25 of No. 8, has a core shaft 42' and a core shaft 42'.
A spring receiving screw 44' is screwed and fixed to the end of the cylinder shaft 43' from which the core shaft 42' projects.
A spring pressure adjustment screw 42a' is formed at the inner end of the spring 2', a spring seat 45 is screwed onto the screw 42a, and a float ground pressure adjustment spring 46' is stretched between the screw 44 and the spring seat 45'. . Said cylinder shaft 4
3' is formed with elongated holes 43a', 43a' in the axial direction, and a locking screw is fitted into the elongated holes 43a', 43a' so that the head protrudes outward from the cylindrical shaft 43'. 45a' and 45a' are screwed and fixed to the spring seat 45'. A pin 42b' for preventing the spring seat 45' from being removed is installed at the end of the screw 42a'. A pin 42c' for setting the amount of advancement is installed in the shaft core 42', and the core shaft 4
At the maximum extension position of 2', insert the pin 42c' into the bolt 4.
4', a seat plate 61 is attached to the outer surface of the bolt 44', and a float ground load adjustment release cam 62 and a release lever 63 are pivotally supported on the core shaft 42' via a pin 64. The release cam 62 is brought into contact with the plate 61, and the cam 62 is brought into pressure contact with the seat plate 61 by operating the release lever 63, and the spring 4
6' and advance the core shaft 42' against the bolt 44'.
By bringing the pin 42c into contact with the pin 42c and rotating the lever 63, which is erected at the imaginary line position in FIG. The spring seat 45' is formed to be displaced.

A coupling frame 66 is rotatably connected to the outer end of the core shaft 42' via a pin 65, a coupling bolt 47' is fixed to the coupling frame 66, and the core shaft is connected to the fixed frame 25 via the bolt 47'. 42' are connected.

Further, a back pressure regulating valve 29' is integrally connected to the cylindrical shaft 43', and a pressure reducing valve 51' is provided at the inner end of the core shaft 42' via a pressure reducing spring 50'. High pressure oil pipe 5 communicated with the switching valve 14 and throttle valve 41 shown in FIG.
2' and a low pressure oil line 53' communicating with the tank 40 are provided in the valve 29', and each oil line 52',
Bracket 54' on end of valve 29' near 53'
and attach a pin 31 to the bracket 30 of the front vehicle body 2.
The bracket 54' is connected and supported through. A pressure reducing valve 51' is incorporated to control communication between the high pressure oil line 52' and the low pressure oil line 53'.
3' and a back pressure chamber 55' of the pressure reducing valve 51' are formed in the valve 51'. As in the above embodiment, the planting section 18 is raised and lowered by increasing and decreasing the float grounding load due to changes in the amount of seedlings on the seedling platform 20 and the grounding pressure of the float 23.
By standing the release lever 63 at the imaginary line position in FIG. 5 and rotating the core shaft 42' through the lever 63, if the surface of the field where rice planting is to be performed is relatively soft, the screw 42a' can be screwed. The attached spring seat 45' is moved toward the inner end of the core shaft 42', and the locking screw 45a', which is an indicator for displaying the float contact load, is displaced in the direction of the dashed arrow shown in the figure, and the spring 46' is compressed. While reducing the ground pressure of the float 23 by weakening the spring force,
When the field surface is relatively hard, the spring seat 45' is moved in the direction of the pin 42c', the screw 45a' is displaced in the direction of the solid arrow shown in the figure, and the compression spring force of the spring 46' is strengthened to float. 2
Increase the ground pressure in step 3.

Furthermore, FIG. 7 is an explanatory view of the operation showing another embodiment, and is an explanatory view of the operation shown in FIG. 3. Similar to the back pressure adjustment valve 29 shown in FIG. It has an operating shaft 49'', a pressure reducing spring 50'', and a pressure reducing valve 51'', forming high pressure and low pressure oil passages 52'' and 53'', respectively, and switching valves 14 and 60.
and each oil pipe 52″ to the throttle valve 41 and tank 40,
The top link 28'' connected to the upper end of the fixed frame 25 is connected to the first swing link 67 via the intermediate link 68.
7 is connected to the second swing link 69, and the operation shaft 49'' is connected to the link 69, and the float ground pressure adjustment spring 46'' is energized to the second swing link 69, and the tension spring of the spring 46'' is A reference value setting lever 70 is provided to adjust the force.
As in each of the above-described embodiments, the planting section 18 is raised and lowered by increasing and decreasing the float ground load due to changes in the amount of seedlings on the seedling platform 20 and the ground pressure of the float 23, and the surface of the field where the rice planting work is performed. The spring 4 is
6'' tension spring force is adjusted to change the grounding pressure of the float 23. By installing the lever 70 near the driver's seat 13 in FIG. The standard value of the load can be set, and the displacement amount of the top link 28'' can be easily increased and the operating force of the lever 70 can be reduced through the first and second swing links 67 and 69. A back pressure adjustment valve 29'' can be provided at any location such as,
Therefore, hydraulic piping etc. can be easily installed.

As shown in the embodiments described above, the present invention includes lift links 28, 28', 28'' and hydraulic cylinders 3 in the riding section 1.
In a rice transplanter in which a planting part 18 is installed to be able to rise and fall freely through a rice transplanter 8, and a float 23 is attached to the lower surface of the float 23 which is grounded on the planting field surface and supports the planting part 18, the amount of seedlings in the planting part 18 is back pressure regulating valves 29, 29', 2 operated by the deformation force of the lifting links 28, 28', 28'' proportional to the change;
9'' and the valves 29, 29', 29'' that control the hydraulic cylinder 38 are connected to the planting section 1.
Spring 46, 46', 46'' is provided to set the operating force for switching according to the change in the supporting force of 8.
The reference value of the supporting force of the planting portion 18 acting on the lifting links 28, 28', 28'' is determined by the spring 26,
It is set by the spring force of 26', 26'',
The planting depth can be maintained approximately constant by dealing with the weight of the seedlings in the planting section 18 and the hardness of the planting field surface, and the float 23 is stably supported on the ground by preventing changes in the planting depth due to seedling succession, etc. The supporting posture of the planting section 18 by the lifting links 28, 28', 28'' can be stabilized, and the switching operation of the valves 29, 29', 29'' due to changes in the weight of the seedlings in the planting section 18 can be properly obtained. At the same time, planting section 18 for multi-row planting
Lifting links 28, 28', with proper supporting force at all times.
28'' to the passenger compartment 1, and has practical effects such as easy and safe handling.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a riding rice transplanter showing an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is an explanatory diagram of operation, Fig. 4 is a cross-sectional side view of the main parts, Fig. 5 6 is an external plan view thereof, and FIG. 7 is an operation explanatory diagram showing another embodiment. 18... Planting part, 46, 46', 46''... Float ground pressure adjustment spring.

Claims (1)

[Scope of utility model registration request] The planting section 18 is installed in the riding section 1 so as to be able to be raised and lowered via lift links 28, 28', 28'' and a hydraulic cylinder 38, and a float 23 that supports the planting section 18 by being grounded on the planting field surface is attached to the riding section 1. In the rice transplanter attached to the lower surface, the lifting links 28, 28', 2 are proportional to the change in the amount of seedlings in the planting section 18.
The valves 29, 29', 29'' are provided with back pressure regulating valves 29, 29', 29'' operated by a deforming force of 8'', and control the hydraulic cylinder 38.
29″ springs 46, 4 that set the operating force for switching according to the change in the supporting force of the planting part 18.
6′, 46″ are provided, and the elevating links 28, 2
8', 28'', the support force reference value of the planting portion 18 is set by the spring force of the springs 26, 26', 26''.