JPH03247208A - Sulky transplanter - Google Patents

Abstract

PURPOSE:To control planting depth having high stability and precision by sliding a detecting element to change an angle of inclination depending upon hardness degree of soil on the surface of mud together with a ground making float. CONSTITUTION:Mechanism 38 of controlling valve changeover resistance and a detecting element 41 are set in such a way that the changeover resistance is set large when the rear of the detecting element is raised and an angle of inclination becomes mild and the changeover resistance is set small when the rear of the detecting element is dropped. Errors of signals from a ground making float 22 caused by degree of hardness on the surface of mud are compensated and the detecting element 41 discovers state of the surface of mud not damaged by the ground making float 22 and sends stable signals.

Description

[Detailed description of the invention]

[0001]

[Industrial application field]

This invention is used for a practical transplanter for transplanting seedlings in paddy fields, and is intended to maintain a uniform planting depth of seedlings regardless of the hardness or softness of the muddy soil. [0002]

[Conventional technology]

This type of riding-type transplanter is equipped with a planting section at the rear of the traveling section that can be moved up and down by a hydraulic lifting device, and the above-mentioned hydraulic By switching the oil path to the lifting device with a switching valve, the ground pressure of the above-mentioned soil leveling float is maintained within a certain range, thereby increasing the height of the planting section relative to the mud surface, that is,
It is designed to keep the planting depth of seedlings constant. [0003] If the mud is hard, the grading float will not easily sink into the mud surface and will float up. Then, the soil leveling float moves closer to the planting area, which causes the planting area to rise upwards and the depth at which the seedlings are planted becomes shallower. Conversely, if the mud surface is soft, the leveling float will tend to sink into the mud surface. Then, the soil leveling float moves downward from the planting section, causing the planting section to move downwards, increasing the planting depth of the seedlings. [0004] In order to solve these problems, the applicant has already proposed the invention of JP-A-54-146718 and attempted to put it into practical use. Further, Japanese Patent Laid-Open No. 57-63013 has also been proposed. [0005]

[Problems to be solved by the invention]

Here, in the former case, when the mud surface is hard, the amount of movement of the stool is increased, so the oil path cannot be switched unless the leveling float moves significantly. Therefore, not only is the variation in the planting depth of seedlings increased, which is undesirable, but the following problems have also emerged. That is, transplanting seedlings in paddy fields is carried out in some places after puddling and stabilizing the mud for two to three days. Here, this detection object detects the mud surface after the grading float has passed, or the mud surface immediately next to it, so
The surface properties of that muddy surface change significantly when the grading float passes over it, and it does not emit an appropriate signal. In addition, in the latter case, the detection object is attached to the main body of the planting section and moves up and down relative to the soil leveling float. There was a drawback that it did not emit light. [0006]

[Means to solve problems]

In order to solve these problems, the present invention provides a planting section 1 that is movable up and down with a hydraulic lifting device 8 relative to the traveling section 1.
8, and by switching the oil path by vertically operating the soil leveling float 22 attached to this planting section 18, the hydraulic lifting device 8 is operated to keep the ground pressure of the soil leveling float 22 within an appropriate range. A switching valve 27 for holding and shaking, a valve switching resistance adjustment mechanism 38 for adjusting the switching resistance of this switching valve 27, and a valve switching resistance adjusting mechanism 38 for adjusting the switching resistance of the switching valve 27, which is attached to the above-mentioned soil leveling float 22 at a distance from the side thereof and plunges into the soil and propels it. A detecting body 41 whose inclination angle changes depending on the hardness/softness of the soil is provided, and the valve switching resistance adjustment mechanism 38 and the detecting body 41 are switched when the rear end of the detecting body 41 rises and the inclination angle becomes gentle. The riding-type transplanter is characterized in that the resistance is increased and the switching resistance is decreased when the rear end of the detection body 41 is lowered and the inclination angle becomes normal. [0007]

[Effect]

Since this invention is configured as described above, when the running section 1 moves forward in the paddy field, the soil leveling float 22 slides on the mud surface, and after this soil leveling float 22 passes, the planting section 18 plants the seedlings. It is being transplanted. When the traveling section 1 reaches a deep part of the tiller, it sinks deep from the mud surface, so the planting section 18 also sinks.
Since the soil leveling float 22 is sliding on the mud surface, the soil leveling float 22 approaches the main body 18 of the planting section 18 (goes up). Then, the switching valve 27 is activated, the oil path to the hydraulic lifting device 8 is switched, and the planting section 18 is raised. When the planting section 18 rises in this way, the ground leveling float 22 descends and the ground pressure decreases, and when that value reaches the standard value, the switching valve 27 returns to stop the planting section 18 from rising and its position Supported by [0008] On the contrary, when the traveling part l comes to a shallow part of the plowing platform, it rises from the mud surface, so the planting part 18 also rises, but the soil leveling float 22 tries to slide on the mud surface. Leveling float 22
leaves (descends) from the planting section 18. Then, the switching valve 27 is operated in the opposite direction to that described above, and the planting section 18 is lowered. When the planting section 18 descends in this way, the ground pressure of the soil leveling float 22 gradually increases, and when that value reaches the standard value, the switching valve 27 returns to its original position and the descending of the planting section 18 is stopped. Supported in position. [0009] In this way, seedling planting work is carried out while keeping the planting section 18 at a constant height above the mud surface.
The lower end is in the mud (soil) on the side.
It is moving forward as if it is rushing into the world. Therefore, when the forward speed is constant (including a constant rate), if the soil is hard, the rear end will slope upward, and if the soil is soft, the rear end will slope downward. do. [0010] That is, when the muddy soil into which the riding-type transplanter is transplanting seedlings is hard, the rear end of the detection body 41 rises, and this rise causes the valve switching resistance adjustment mechanism 38 to operate, causing the above-mentioned switching valve 27 to rise. The switching resistance of the planting section 18 to the upward side is increased. On the contrary, if the mud is soft, the rear end of the detection body 41 will descend,
The valve switching resistance adjusting mechanism 38 is actuated by the lowering, and the switching resistance of the switching valve 27 to the rising side of the planting portion is reduced. [0011]

【effect】

As described above, according to the present invention, the planting section 8 automatically moves up and down with respect to the running section 1 according to the depth and shallowness of the tiller, and the planting depth of the seedlings by the planting section 8 is within a certain range. is maintained. In the upward movement, the switching resistance of the switching valve 27 increases or decreases depending on the hardness or softness of the mud (soil), so errors in the signal from the leveling float 22 due to the hardness or softness of the mud surface are automatically corrected. In addition, the detection body 41 that emits the signal is attached to the soil leveling float 22, and it always moves forward along the mud surface and emits a signal with little fluctuation due to little vertical movement. The detection body 41 is located further away from the side surface of the soil leveling float 22 and detects and transmits the condition of the mud surface that has not been disturbed by the soil leveling float 22, so it is characterized in that it emits highly reliable information. [0012]

【Example】

Next, embodiments of the present invention will be described based on the drawings. Reference numeral 1 denotes a traveling section, which has a prime mover covered by a bonnet at the front of a vehicle body 4 having front wheels 2 and rear wheels 3, and a driver's seat 5 provided above the rear wheels 3. 6 is the control handle, 7
1 is a chain case provided on both left and right sides of the vehicle body 4, and the rear wheel 3 is attached to the rear end of the chain case. [0013] Reference numeral 8 denotes a hydraulic lifting device, in which the left and right chain cases 7 are connected by a gate-shaped frame 9 when viewed from the rear, and an upper link 10 is connected to this frame 9.
The front end of the lower link 11 is pivotally connected to the lower link 11. A hitch frame 12 is attached to the rear ends of both links 10 and 11 to form a parallel link mechanism 13, and a hydraulic cylinder 15 is installed between the upper link 10 and a connecting pipe 14 that connects the left and right chain cases 7. A hydraulic piston 16 is attached that projects from this. 17 is the hydraulic piston 16 and the upper link 10
This is a buffer spring installed between the [0014] Reference numeral 18 denotes a planting section, which is comprised of a seedling tank 20 that reciprocates left and right on a machine frame 19, and a seedling planting rod 21 that divides and transplants seedlings from the seedling tank 20. Reference numerals 22 and 23 indicate center and side leveling floats arranged at predetermined intervals in the left and right direction, and the rear ends of the leveling floats 22 and 23 are pivoted to the machine frame 19 via the vertical adjustment lever 24. I'm wearing it. [0015] A machine frame 19 of the planting section 18 is connected to the hitch frame 12 via a rolling shaft 25 that is rotatable in the front-rear direction. 26 is a power transmission shaft for power transmission. Reference numeral 27 denotes a hydraulic switching valve provided between the hydraulic cylinder 15 and the hydraulic pump 28 of the hydraulic lifting device 8, and the planting section 18 is moved up and down by switching this valve 27. is pivotally connected via a pin 30 to a support frame 29 pivotally attached to the front part of the machine frame 19, and the spool 31 of this valve 27 is connected to the center leveling float 2.
2 with a pin 32. [0016] The support frame 29 has a rod 33 attached to the vertical adjustment lever 24 of the soil leveling float for adjusting the seedling planting depth.
, are interlocked via arm 34. 35 and 36 are link rods, the base of the link rod 35 is pivotally connected with the pin 30, and the base of the link rod 36 is connected to the leveling float 2.
2 by the pin 32, and the link rods 35 and 36 of both
are pivotally connected in the middle by a pin 37, and the front side of the ground leveling float 22 is configured to be movable up and down. [0017] Reference numeral 38 denotes a valve switching resistance adjustment mechanism, which is provided with a tension spring 40 interposed between the adjustment arm 39 pivotally connected by the pin 30 and the link rod 36, and the adjustment arm 39
When adjusting in the direction of arrow A, the spring 40 is provided to suppress the upward movement of the leveling float 22 and increase the resistance of the spool 31 in the direction of the arrow. Reference numeral 41 denotes a rake-like detector that detects the hardness or softness of the soil that intervenes in the soil surface, and is disposed on both the left and right sides of the soil leveling float 22 in the center. The metal fitting 43 and the forward bending adjustment arm 3'9 are connected via the rod 44, and a large running resistance is applied to the detection body 41, causing the detection body 41 to move in the direction of arrow C. The adjustment arm 39 is configured to rotate in the direction of arrow A when the adjustment arm 39 is rotated significantly. [0018] Reference numeral 45 denotes a hydraulic pressure switching lever, which is interlocked and connected to the connecting pin 32 between the earth leveling float 22 and the spool 31 with a wire 46, and is provided so that the hydraulic pressure switching valve 27 can be switched as appropriate. 47 is a free pressure tank, and 48 is a relief valve. Regarding the upper configuration, the traveling section 1 is run and the planting section 18 is lowered to level the soil surface of the field)22.
23 to the ground, and after loading the seedlings into the seedling tank 20, the planting section 1
Each rotating part of 8 is rotated by transmission. [0019] Then, the planting part 18 is towed and the ground leveling flow) 22.2
3 prepares the soil surface, and a seedling planting rod 21 divides and plants seedlings from a seedling tank 20. Seedlings are planted in this manner, but when the tiller becomes deeper and the tractor side sinks, the soil leveling flow 22, 23 of the planting section 18 is strongly pressed against the soil. Then, the front part of the ground leveling float 22 and 23 is pushed up by the ground pressure, and the hydraulic switching valve 2 is activated by the ground leveling float 22.
The spool 31 of No. 7 is pushed up in the direction of the arrow and switched, and the oil from the hydraulic pump 28 is sent into the hydraulic cylinder 15 to cause the piston 16 to protrude, pushing up the upper link 10 of the parallel link and pushing up the planting part 18. to rise. and,
When the ground pressure of the soil leveling float 22 gradually decreases to a state suitable for seedling planting, the spool 31 moves downward, the hydraulic valve 27 is switched, and the raising of the planting part 18 is stopped. [00201 On the other hand, when the tilling platform becomes shallow and the planting part 18 starts to float, and the soil leveling float 22 moves downward, the spool 31 is pulled out in the opposite direction of the arrow, and the hydraulic switching valve 27 is switched to start planting. The section 18 is lowered to maintain the ground pressure of the ground leveling float 22 at an appropriate level. Rake-shaped detectors 41 are provided on both left and right sides of the soil leveling float 22 at positions where the soil cannot be leveled by the soil leveling floats 22 and 23. Although the soil is being leveled, if the soil surface is hard, there will be a large forward resistance and the detection body 41 will be rotated largely in the direction of arrow C. Then, the metal fitting 43 and the rod 4
4, the adjustment arm 39 is rotated in the direction of the arrow A, and the tension of the spring 40 is set to the same value. Therefore, even if the ground pressure of the soil leveling float 22 increases considerably, the spool 31 becomes difficult to move in the direction of the arrow, and the upward control of the planting section 18 becomes insensitive, causing the planting section 18 to move up and down unnecessarily. This will result in stable leveling without any hunting. [0021] Conversely, when the soil surface is soft, the resistance applied to the detection body 41 decreases, and the detection body 41 is moved by the spring 4 in the opposite direction of arrow C.
Therefore, the spring 40
The elastic force of becomes weaker. For this reason, the spool 31 is pushed in with an extremely weak force, and the upward control of the planting section 18 becomes insensitive, and the upward control of the planting section 18 is performed with the soil leveling float 22 lightly touching the soil surface. It is possible to prevent the muddy soil on the soil surface from crowding in and crushing the neighboring 100 rows that have already been planted [0022] In this way, the planting section automatically Although the sensitivity of the raising motion is changed, this sensitivity is not varied by changing the planting depth. That is, when the vertical adjustment lever 24 of the float is rotated backward in FIG. 2, the rear part of the float rises and the seedling planting depth becomes deeper, but at this time, the rod 33 is pushed forward,
The support frame 29 is pivoted upward via the arm 34, and the front part of the float is also moved upward via the link rods 35, 36, and the adjusting arm 39 is also moved upward.
As the float 22 moves upward, the detecting body 41 attached to it via a rod 44 and a metal fitting 43 also moves upward under the same relationship. [0023] Therefore, even if the soil leveling float 22 is moved upward using the vertical adjustment lever 24 to deepen the seedling planting depth, the hard/soft detection sensitivity of the detector 41 does not change. When the adjustment lever 24 is rotated forward, the rear part of the float moves downward, and the rod 33, arm 34, support frame 29,
The front part of the float is also moved down via the link rods 35 and 36,
Furthermore, the interlocking mechanism connected to the detection body 41 connected to the adjustment arm 39 via the rod 44 and the metal fitting 43 similarly moves downward, so that the detection state of the detection body 41 does not change.

[Brief explanation of drawings]

[Figure 1] FIG. 1 is a side view of a riding-type transplanter to which the present invention is applied.

[Figure 2] An enlarged side view of a portion thereof.

[Figure 3] A plan view of a part of it.

[Figure 4] Its hydraulic circuit diagram.

[Explanation of symbols]

1　Travel part 8 Hydraulic lifting device 18 Planting section 22 Ground leveling float 27 Switching valve 38 Valve switching resistance adjustment mechanism 41 Detection object

【Document name】

drawing

[Figure 2]

[Figure 3]

Claims (1)

[Claims] [Claim 1] A planting section 18 is provided to be movable up and down with a hydraulic lifting device 8 with respect to the traveling section 1, and an oil path is switched by vertical operation of a soil leveling float 22 attached to this planting section 18. A switching valve 27 that operates the hydraulic lifting device 8 to maintain the ground pressure of the ground leveling float 22 within an appropriate range; and a valve switching resistance adjustment mechanism 38 that adjusts the switching resistance of the switching valve 27. A detection body 41 is attached to the above-mentioned soil leveling float 22 at a distance from its side surface and propelled into the soil, and the inclination angle changes depending on the hardness/softness of the soil. The body 41 increases the switching resistance when the rear end of the detector 41 goes up and the inclination angle becomes gentle, and decreases the switching resistance when the rear end of the detector 41 goes down and the tilt angle becomes moderate. A riding-type transplanter characterized by being connected so as to be connected to each other.