JPH0720409B2 - Rolling control device for paddy work machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rolling control device applicable to paddy field working machines such as a walk-behind rice transplanter, a riding rice transplanter, and a rice transplanter with a fertilizer application device. More specifically, the present invention relates to a rolling control device for a paddy working machine equipped with a seedling mounting table that moves laterally back and forth.

[Prior art]

For example, as in Japanese Utility Model Laid-Open No. 62-60112, a planting device connected to the rear of the machine body is provided so as to be able to roll around a rolling shaft in the front-rear direction provided on the machine body side, and by left and right springs. It is held in a horizontal position. As a result, even if the body tilts to the left or right, the planting device maintains a substantially horizontal posture centered on the rolling axis, so that the seedlings are accurately planted by the planting rods arranged side by side on the left and right sides. It is becoming like this.

This planting device is provided with a seedling stand that reciprocates laterally in the left-right direction together with the placed pine seedlings, and between the seedling stand and the machine above the rolling axis, the left and right It is connected by a spring so that the rolling action of the planting device is not hindered even if the seedling table is laterally moved by the biasing force of the spring.

However, the conventional seedling planting speed was about 0.7 m / sec, which has recently been reduced to about 1.0-
High-speed planting of about 1.2 m / sec has come to be implemented. With such high-speed planting, the lateral movement speed of the seedling stand also becomes proportionally high, so the planting centered on the rolling axis is increased by increasing the inertial force of the seedling stand moving at this high speed. The device has a problem that the left and right tilting becomes large, one planting rod becomes deeply planted, and the other planting rod becomes floating seedling, resulting in disordered planting accuracy.

[Problems to be solved by the invention]

As a solution to this problem, the vertical movement of the side float sliding on the rice field was detected, and the hydraulic cylinder that actuated by this detection compensated for the spring that urges the planting device and was arranged side by side in the horizontal direction. An attempt has been made to have a structure that maintains the planting accuracy of the planting rod. However, the left and right side floats provided in the planting device are generally arranged in a width that doubles as a mark for the traveling wheels traveling in front of the planting device. Since it becomes extremely uneven, detection of the side float position sliding on the track of this unevenness will cause false detection of factors other than horizontal on the paddy field, making it difficult to make the planting depth uniform. There was a drawback.

Also, the vertical position of this side float with respect to the planting rod moves up and down in conjunction with the adjustment of the seedling planting depth, so if the planting depth is adjusted, the side float detection point must be readjusted. There was a problem in that the adjustment had to be troublesome.

Further, for example, according to Japanese Patent Laid-Open No. 63-28303, left and right detection floats different from the side floats are provided outside the side floats, and rolling control is performed based on the output difference between the left and right sensors detected by the left and right detection floats. Although a microcomputer type has been proposed, the sensor, valve and control device for making the planting device having the planting rods arranged side by side on the left and right sides follow the paddy field requires very high accuracy. Therefore, there is a problem that the cost will be high, and the rice transplanter will be used in the mud, and the rice transplanter whose planting period has ended will be distributed to farmers until the planting period of the next year. Since it is stored, there is a problem that the electric system during the storage period may be damaged by rust, rat, and water.

Therefore, in view of the conventional situation described above, the present invention was devised to solve these problems, and a spring for controlling the lateral tilt of the planting device is interlocked with the reciprocating lateral movement of the seedling table. The present invention is implemented for the purpose of providing a rolling control device for a paddy work machine that is urged by an operating hydraulic expansion / contraction mechanism.

[Means for solving problems]

The present invention to achieve the above-mentioned object, in a paddy working machine equipped with a planting device in which a seedling platform is reciprocally moved laterally in a passenger machine, the left and right tilting of the planting device pivotally supported by the central hitch on the machine side. The left and right spring ends to be regulated are independently locked to the left and right spring pressure adjusting mechanisms provided on the machine body side, respectively, and a detection mechanism for detecting the lateral movement of the seedling table is provided. It is characterized in that the spring pressure adjusting mechanism on the protruding side is operated.

[Action]

In this way, the left and right spring ends that regulate the left and right tilting of the planting device pivotally supported by the central hitch on the fuselage side are independently locked to the left and right spring pressure adjustment mechanisms provided on the fuselage side, respectively. By providing a detection mechanism for detecting the lateral movement of the seedling placing table and operating the spring pressure adjusting mechanism on the side protruding by the lateral movement by the detecting mechanism, only the spring on the projecting side of the seedling placing table is activated by the spring pressure adjusting mechanism. Is urged along with the lateral movement of the seedling mounting table, and the spring on the non-protruding side has only a slight spring pressure decrease due to only the movement of the seedling mounting table, so it is almost the same as when the seedling mounting table is in the center of the machine. Similar left and right balance is obtained.

Also, because it is not a sensor surface detection by a sensor float or a side float that grounds on the field surface, there is no need to make corrections in conjunction with the planting depth adjustment, and the applicable range is wide regardless of the hardness of the field. obtain.

〔Example〕

Hereinafter, the drawings showing the present invention as an embodiment will be described.

As shown in FIG. 2, a parallel link mechanism 2 is connected to the rear of the passenger body 1, a central hitch 3 is connected to the rear of the parallel link mechanism 2 in the vertical direction, and a rolling provided on the central hitch 3 is provided. A rolling shaft (fulcrum shaft) 5 provided on the planting device 4 and extending forward is rotatably positioned in the hole 5a.

The passenger machine body 1 is configured to travel by a pair of left and right front wheels 6 and rear wheels 7, and an engine 9 is mounted in front of the passenger machine body 1. The other end of the hydraulic expansion / contraction mechanism 10 whose one end is connected to the parallel link mechanism 2 is connected to the rear end of the front-wheel drive case 11, and the parallel link mechanism 2 is moved up and down by the expansion / contraction of the hydraulic expansion / contraction mechanism 10 so that the entire planting device 4 is moved. Moves up and down.

The planting device 4 includes a seedling stand 12 that reciprocates laterally in the left-right direction.
The pine seedlings (not shown) are placed and supplied on the seedling placing table 12. A planting rod 13 that moves on a predetermined planting locus is provided below the seedling mounting table 12, and below the planting device 4, gliding on the rice field as shown in the plan view of FIG. A center float 14 at the center position and side floats 15 on both left and right sides of the main float 14 are arranged, and the side floats 15 are arranged in a width that advances on the track of the front wheels 6 and the rear wheels 7. Has been done.

As shown in FIG. 1, left and right brackets 19 are fixed to the back surface of the seedling mounting table 12, and a slide that reciprocates laterally in the left and right direction is interlocked with the rotation of the Napiers screw shaft 16 between the left and right brackets 19. By fixing the shaft 17, the lateral feed mechanism 20 of the seedling table 12 is configured. The lateral feeding mechanism 20 is configured so that the seedling placing table 12 reciprocates laterally in the left-right direction. The rotation speed of the Napiers screw shaft 16 can be changed by a speed change mechanism 20a provided in the lateral feed mechanism 20. A sensor shaft parallel to the slide shaft 17 between the left and right brackets 19 above.
21 is fixed, and a sensor pin 22 is projected from the sensor shaft 21 for individually operating a valve arm 25 which will be described later in association with the lateral movement of the sensor shaft 21. The sensor pin 22 may be provided so as to be positionally adjustable and fixed along the axial direction of the sensor shaft 21 so that the switching timing with the valve arm 25 can be adjusted. It may be combined with the shaft 17.

A valve chamber 23 is arranged on the centerline O of the planting device 4, and spools 24 and 27 for individually switching oil passages are provided on both sides of the valve chamber 23 across the sensor shaft 21. Each switching valve 28 is provided, and both spools 24, 27 have
The base ends of the respective valve arms 25, whose front ends extend toward the sensor shaft 21, are fixed.

Each of the valve arms 25 is provided with a return spring 26 for returning to the neutral position at a position separated from the sensor pin 22. This return structure may be a valve built-in type.

The valve arm 25 and the sensor pin 22 are shown in FIG.
As shown in FIG. 2, the upper valve arm 25 reaches the sensor pin before the sensor shaft 21 reaches the left end of the forward movement G toward the left.
It comes into contact with 22 and rotates by a predetermined angle to switch the spool 24 to the "raising zone U", then comes off the sensor pin 22 and automatically returns to the "neutral zone N". As shown in FIG. 4B, at a position beyond the moving end of the sensor shaft 21 and past the moving end of the backward movement R toward the right side, the upper valve arm 25 contacts the sensor pin 22 and rotates by a predetermined angle to spool. After switching the 24 to the "lowering zone D", the sensor pin 22 is detached from the sensor pin 22, and the "neutral zone N" is automatically restored.

Then, as shown in FIG. 4C, before reaching the right side moving end of the outward movement R toward the right side of the sensor shaft 21, the valve arm 25 comes into contact with the sensor pin 22 and rotates by a predetermined angle to rotate the spool 27 in the “raising zone”. After switching to "U", it is removed from the sensor pin 22 and returns to the "neutral zone N".
In this way, both spools 24, 27 have a structure that is switched in association with the reciprocating lateral movement of the sensor shaft 21.

Above the central hitch 3 is a hydraulic cylinder 29a on the right side.
And a hydraulic expansion / contraction mechanism 29 composed of a hydraulic piston 29b and a hydraulic expansion / contraction mechanism 30 composed of a left hydraulic cylinder 30a and a hydraulic piston 30b, respectively.
Single acting type is adopted for a and 30a. The hydraulic expansion / contraction mechanisms 29, 30 and the switching valves 28, 28 described above are connected to the hydraulic circuit shown in FIG. That is, both switching valves 28 are respectively communicated with the single hydraulic pump 32 via the oil passage passing through the flow dividing valve 31a, and the flow dividing valve 31b is connected to the planting device via the oil passage passing through the control valve 34. 4 Hydraulic expansion / contraction mechanism 10 that moves up and down
Is in communication with. Reference numeral 33 in FIG. 3 is a tank.

Therefore, the total flow rate Q of the hydraulic oil by the hydraulic pump 32 is
Is the rotational speed rp of the pump 32, as shown by the dotted line in FIG. 3A.
Although the proportional flow rate increases as m becomes higher, the flow rate Q reaching each switching valve 28 is proportional to the rotational speed rpm in the range where the flow rate is small as shown by the solid line in FIG. Therefore, if the minimum flow rate of the hydraulic oil reaching the hydraulic expansion / contraction mechanisms 29, 30 is adjusted to the minimum speed (maximum scraping width) of the seedling placing table 12, the seedling placing table 12 There is no deficiency in the discharge amount even when the maximum speed (the minimum scraping width) is reached.

When switching each switching valve 28 from the "neutral zone N" to the "lowering zone D", it is not necessary to provide because it is the direction in which the pressure oil escapes, but conversely the "neutral zone N" is switched to the "raising zone U". In this case, each switching valve 28 is provided with an underlap circuit of a type in which a part of the pressure oil is returned to the tank so that the pressure oil does not flow suddenly.

Therefore, the spools 24 and 27 facing each other are, as shown in FIG. 6, from the "neutral zone N" to the "raising zone U".
When switching to, the switching valve 28 is smoothly switched by the "underlap zone AR" provided between the "neutral zone N" and the "raising zone U", and the hydraulic expansion mechanism on the switching side is switched. 29 or 30 is adapted to grow at a speed substantially similar to the moving speed of the seedling mounting table 12. Further, instead of the underlap circuit, a rotary valve type switching valve may be adopted, which is gently switched.

A pair of left and right springs 35, 36 are stretched across the respective hydraulic pistons 29b, 30b and the left and right sides of the rear surface of the seedling table 12 which reciprocates laterally.
Is stretched in a divergent manner so that the hydraulic pistons 29b and 30b are narrow on the side and the seedling table 12 is wide. The hydraulic expansion / contraction mechanisms 29 and 30 are arranged such that the pistons 29b and 30b on the upper side are mutually connected as shown in FIG. The piston 29 is inclined in a diagonally opposite direction, or along the tensioning direction of the spring 35 as shown in FIG.
Each cylinder 29 in a tilted posture with b and 30b facing outward
You may provide so that a and 30a may cross front-back position.

A pair of left and right auxiliary springs are provided between the upper portion of the central hitch 3 and the transmission case 37 extending in the left-right direction on the side of the planting device 4.
39 are stretched respectively, and the above left and right springs 35, 36 are provided.
The lower end side of the may be locked to the transmission case 37. In FIGS. 2 and 8 to 10, reference numeral 2a is an upper link that constitutes the parallel link mechanism 2.

Next, the operation will be described.
If the left and right centers of the
Since 30 is held in the “down position”, the seedling table 12 is biased by the pair of left and right springs 35, 36 in a left-right balanced manner.

As shown in FIG. 7, even if the seedling mounting table 12 moves outward from the center position to the left, the protruding spring 35 of the seedling mounting table 12 is gradually extended in association with the movement of the seedling mounting table 12. Since the energizing force becomes large, the seedling placing table 12 is held horizontally without tilting to the left, but it is about 1/3 of the pine seedling width (about 300 mm) before reaching the left moving end. At the position, the switching valve 28 on the side connected to the hydraulic expansion / contraction mechanism 29 is switched to the "raising zone U", whereby the piston 29b of the hydraulic expansion / contraction mechanism 29 is changed.
Rises slowly and the protruding side spring 35 extends, and the urging force of the extended side spring 35 increases.

The switching valve 28 automatically returns to the "neutral zone N" as the sensor shaft 21 moves, but the piston 29b remains in the raised position, and the spring 35 on the protruding side.
Is the return path R where the seedling stand 12 goes from the left end to the right.
Since the switching valve 28 on the hydraulic expansion / contraction mechanism 29 side is switched to the "down zone D" at a position of about 1/3 of the above, the extended state is maintained until the piston 29b reaches the lowered position. The left-right balance of the seedling placing table 12 when moved to the vicinity of the moving end on the left side can be maintained by approximating the balance in a state where the left-right center of the seedling placing table 12 substantially coincides with the machine center line O.

The switching valve 28 switched to the “lowering zone D” automatically returns to the “neutral zone N” by the lateral movement of the subsequent backward movement R of the seedling placing table 12, and the seedling placing table 12 returns to the lowered position. Spring 35 supported by piston 29b
The left and right balance is maintained by being supported by the urging force of.

When the seedling mounting table 12 moves backward toward the right side R, the projecting spring 36 of the seedling mounting table 12 gradually extends in conjunction with the movement of the seedling mounting table 12, so that the seedling mounting table 12 tilts to the right side. Although it is held in the horizontal direction without moving, the switching valve 28 on the hydraulic expansion / contraction mechanism 30 side is switched to the "raising zone U" at a position of about 1/3 before reaching the right side moving end, whereby the hydraulic expansion / contraction is performed. The piston 30b of the mechanism 30 rises slowly and the protruding side spring 36 expands, and the urging force of the spring 35 on the expanded side increases.

The switching valve 28 automatically returns to the "neutral zone N" as the sensor shaft 21 moves, but the piston 30b is still held in the raised position, and the projecting spring 36 is provided on the seedling table.
At a position where 12 is about 1/3 of the forward movement G from the right side moving end to the left side, until the switching valve 28 on the hydraulic expansion / contraction mechanism 30 side is switched to the "lowering zone D" and the piston 30b is in the lowering position. Since the extended state is maintained over the entire length, the left and right balance of the seedling mounting table 12 when moved to the vicinity of the moving end on the right side is balanced so that the left and right center of the seedling mounting table 12 substantially coincides with the machine center line O. Can be approximated and held.

The switching valve 28 switched to the "down zone D" is automatically returned to the "neutral zone N" by the lateral movement of the outward movement G of the seedling placing table 12, and the seedling placing table 12 is returned to the lowered position. The left and right balance is maintained by being supported by the urging force of the spring 36 which is supported by the piston 30b.

In this way, the left and right springs 35, 36 are alternately biased by the hydraulic expansion and contraction mechanism held in the raised position in conjunction with the lateral movement of the seedling mounting table, so that the planting centered on the fulcrum shaft 5 is centered. Since the lateral balance of the planting device 4 can be corrected and the horizontal posture of the planting device 4 can be maintained, accurate planting can be performed by the planting rod.

〔The invention's effect〕

As described above, the present invention provides the left and right spring ends that regulate the left and right tilting of the planting device pivotally supported by the central hitch on the fuselage side to the left and right spring pressure adjusting mechanisms provided on the fuselage side. Since each of them is independently locked and provided with a detection mechanism for detecting the lateral movement of the seedling mounting table, and the spring pressure adjusting mechanism on the side protruding by the lateral movement is operated by the detecting mechanism, the seedling mounting table is operated by the spring pressure adjusting mechanism. Only the spring on the projecting side is urged along with the lateral movement of the seedling table, and the spring on the non-projecting side is only a slight decrease in spring pressure due to the movement of the seedling table. The left and right balance is almost the same as when it is in the center.

Furthermore, because it does not detect the rice field surface using a sensor float or a side float that touches the rice field, there is no need to make corrections in conjunction with the planting depth adjustment, and the applicable range can be widened regardless of the hardness of the field. .

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a schematic relational diagram of a lateral reciprocating lateral movement mechanism of a seedling table and a hydraulic expansion / contraction mechanism, Fig. 2 is an overall side view of a riding rice transplanter, and Fig. 3 is Hydraulic circuit diagram, 3rd
FIG. A is a relational diagram of flow rate and rotation speed, FIG. 4 is an action explanatory diagram showing lateral movement of the seedling table and a switching state of the switching valve, and FIG. 5 is a side view showing a relation between the sensor shaft and the valve arm. FIG. 6 is an operation explanatory view showing the switching range of the switching valve, FIG. 7 is a description of the relationship between the lateral movement of the seedling table and the switching position of the switching valve, and FIG. 8 is a layout diagram of the relationship between the hydraulic expansion mechanism and the spring. FIG. 9 is a layout view showing the relationship between a hydraulic expansion / contraction mechanism and a spring showing another example, and FIG. 10 is a layout view showing the relationship between a hydraulic expansion / contraction mechanism and a spring showing another example.
FIG. 11 is a plan layout view showing the relationship between the float and the wheels. DESCRIPTION OF SYMBOLS 1 ... Traveling body, 3 ... Central hitch, 4 ... Planting device, 5 ... Support shaft, 10 ... Hydraulic expansion / contraction mechanism, 12 ... Seedling stand, 16 ... Napiers screw shaft, 21 ... Sensor shaft, 22 ... Sensor pin, 24 ... Spool, 25 ... Valve arm, 27 ... Spool, 28a ... Switching valve, 2
8b ... Switching valve, 29 ... Hydraulic expansion / contraction mechanism, 29a ... Hydraulic cylinder, 2
9b ... hydraulic piston, 30 ... hydraulic expansion / contraction mechanism, 30a ... hydraulic cylinder, 30b ... hydraulic piston, 31 ... shunt valve, 32 ... hydraulic pump, 34 ... control valve, 35 ... spring, 36 ... spring.

Claims (1)

[Claims] 1. In a paddy working machine equipped with a planting device in which a seedling stand moves reciprocally laterally on a passenger machine, a left and right tilting device for restricting left and right tilting of the planting device pivotally supported by a central hitch on the machine body side. The spring ends are independently locked to the left and right spring pressure adjusting mechanisms provided on the machine side, and a detection mechanism for detecting the lateral movement of the seedling mounting table is provided. A rolling control device for a paddy work machine, which operates a spring pressure adjusting mechanism.