JP2593006B2 - Rice transplanter balance adjustment mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for suppressing a change in weight balance in the horizontal direction caused by a lateral movement of a seedling mounting table in a planting device of a rice transplanter. It is also applicable to rice transplanters.

[0002]

2. Description of the Related Art As a conventional rice transplanter of this type, a conventional four-link mechanism and a support member fixed to the left and right sides of the rear surface of a seedling mounting table, as disclosed in Japanese Patent Application Laid-Open No. 1-269414, have been proposed. Thus, a balance adjustment mechanism by erection of a pair of tension springs has been employed.

That is, in a typical rice transplanter, the planting apparatus is configured to be rollable with respect to a four-link mechanism (machine body). For example, when the seedling mounting table moves to the right, the center of gravity of the planting apparatus also changes. Since it moves to the right and rolls downward in the right direction, it becomes one of the causes of upsetting the planting depth on the left and right, and in order to suppress this, the pair of tension springs raise the seedling mounting part on the side that becomes heavier. The supporting force is strengthened, so that the rolling in the downward right direction is prevented as much as possible. Although the lateral movement of the seedling placing table theoretically affects the center of gravity of the traveling body, the degree of rolling of the traveling body itself is low because the body is sufficiently heavy, and does not cause any problem.

[0004]

However, the means for correcting the weight balance by the above-mentioned prior art balance adjusting mechanism is a stroke-compatible type in which the pulling force is determined according to the lateral displacement of the seedling mounting table. Therefore, the weight of the seedling mounting table, which changes every moment depending on the degree of decrease in the mounted seedlings, is not taken into consideration. For this reason, the pulling force is insufficient when the seedlings are fully loaded, and there is a mechanical drawback that the tensile force is too strong when there are few seedlings. There was a tendency that it was difficult to keep the planting depth of the seedlings constant.

[0005] In any of the systems having a tilt detection type based on a side float and an automatic rolling control device using a horizontal sensor, the operation time required for detecting the inclination of the right and left due to the lateral movement of the seedling mounting table and correcting the inclination is described above. Because it was slower than the lateral movement, there was always a delay in response and lack of smoothness.

An object of the present invention is to provide a balance adjusting mechanism capable of suppressing a change in left-right balance due to lateral movement of a seedling mounting table to a higher level in consideration of the weight of a mounted seedling.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a seedling mounting table which reciprocates left and right by a predetermined stroke amount with respect to a fixed portion of a planting device with a planting operation of a planting mechanism. A balancing mechanism for traversing the planting device, and a balance detecting means for detecting a lateral weight balance of the seedling mounting table with respect to a fixed portion of the planting device; and a weight balance state detected by the balancing detecting means. The lateral movement of the seedling platform based on the detection information by the balance detecting means, in order to match a predetermined weight balance state in the left-right direction with respect to the fixed portion of the seedling platform with respect to the planting device fixed in advance. A balance adjusting means is provided which cancels and suppresses a change in the weight balance in the left-right direction caused by this.

[0008]

According to the above-mentioned characteristic configuration, the equilibrium detecting means is provided, so that the seedling mounting table can be fixed to the fixed portion of the planting apparatus regardless of the amount of lateral movement of the seedling mounting table and the amount of mounted seedlings during the planting operation. Can be detected at any time. or,
There is provided a balance adjusting means for canceling and suppressing a change in the weight balance in the left-right direction caused by the lateral movement of the seedling mounting table, and this is operated based on the detection information of the balance detecting means. The weight balance is adjusted to a predetermined weight balance state in the horizontal direction of the seedling table with respect to the fixed portion of the planting device, which is set in advance, regardless of the situation that changes every moment due to the lateral movement and the reduction of the mounted seedlings. It becomes possible.

[0009]

Therefore, not only the amount of lateral movement of the mounted seedlings,
In consideration of the weight, it is possible to suppress the change in the left-right balance due to the lateral movement of the seedling mounting table to a higher level, and to improve the rolling control accuracy with the response delay extremely small, Was able to provide a balance adjustment mechanism that could easily maintain the planting depth of seedlings more constant as a whole.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings for a case of a riding type rice transplanter. As shown in FIGS. 2 and 3, the transmission case 3 and the horizontal axis P1 of the transmission case 3 extending from the planted transmission case 1 are mounted on a support frame 2 extending left and right from the central planted transmission case 1.
Around each, six sets of planting cases 4 are supported rotatably so that two sets of planting cases are provided, and planting arms 5 and the like are supported on both ends of the planting case 4 so that the seedlings of the seedling mounting table 10 are stored. A planting mechanism C for planting on a rice field is configured. The planting transmission case 1 is provided with one transverse feed shaft 6 penetrating therethrough. Support members 7 are connected to both ends of the transverse feed shaft 6, and the lower first guide rail 8 and the upper second guide rail 8. A lower part of the back of a seedling mounting table 10 slidably supported in the left-right direction by a guide rail 9 is connected to the support member 7, and the lateral feeding shaft 6 is reciprocated and laterally driven in the axial direction to place the seedlings. A traverse mechanism A for reciprocatingly moving the table 10 right and left is configured.

The planting apparatus B having the planting mechanism C and the lateral feed mechanism A is connected to the front-rear axis P2 at the lower rear end of the quadruple link mechanism 11 extended from the traveling body (not shown). The four link mechanism 11
A backward-acting rolling cylinder 12 is fixed to the upper rear end of the rolling cylinder 12 so as to be swingable from side to side.
The piston rod 12a projecting from the left and right and the second guide rail 9 are connected via a flexible spring 13, so that the entire planting apparatus B can be rolled around the longitudinal axis P2 by the expansion and contraction operation of the rolling cylinder 12. It is configured in. Then, a pair of balance springs 14 is provided over the upper rear end of the quadruple link mechanism 11 and the left and right support members 7, and when the seedling mounting table 10 is located at the left and right center positions of the planting apparatus B. The balance springs 14 are assembled so as to be longer than their natural length.

Next, the rolling control mechanism and the elevation control mechanism of the planting device B will be briefly described with reference to FIGS. Of the three floats, the left and right ground floats 16, 16 are for controlling the rolling of the planting device B,
The difference in the amount of vertical swing movement about the horizontal axis P3 at the rear end is taken out by the mechanical link mechanism R, and the planting depth on the left and right by switching the control valve 17 of the rolling cylinder 12 is thereby determined. A rolling control mechanism 32 that automatically adjusts is provided. The center float 15 at the center is used to control the elevation of the planting device B. The mechanical link mechanism Q detects the amount of vertical swing movement around the horizontal axis P3 at the rear end of the center float 15.
This constitutes a lifting control mechanism 33 that automatically adjusts the planting depth of the entire planting apparatus by switching the control valve 19 of the lifting cylinder 18. Since the above two mechanisms are well-known technologies, further detailed description will be omitted.

Next, the balance adjusting mechanism 20 of the planting device will be described. As shown in FIG. 1, a balance detecting means for detecting a weight balance in a lateral direction with respect to a fixed portion (a fixed system including a planting mission case 1, a support frame 2, and a transmission case 3) of the planting device B of the seedling mounting table 10. D, and a balance adjusting means E for canceling and suppressing a change in the weight balance in the left-right direction caused by the lateral movement of the seedling mounting table 10 by the lateral feed mechanism A. The weight balance state detected by the balance detection means D is changed to a predetermined weight balance state in the left-right direction with respect to the fixed portion of the planting device B of the seedling mounting table 10 preset by the balance adjustment means E. It is configured to match.

That is, the equilibrium detecting means D includes the seedling mounting table 1.
A strain gauge 24 is attached to each of a pair of left and right support arms 23 of the first guide rail 8 that supports the first guide rail 8, and the weight of the mounted seedling and the entire seedling mounting table 10 can be detected by detecting the strain amount of the strain gauge 24. The left-right balance (the position of the center of gravity of the seedling table 10 with respect to the left and right strain gauges 24 in the left-right direction) can be detected from the difference between the outputs of the left and right strain gauges 24. The balance adjusting means E is constructed by expanding and contracting the rolling cylinder 12 to forcibly expand and contract the right and left flexible springs 13, and the right and left about the longitudinal axis P 2 of the seedling mounting table 10 for rolling. , The moment about the axis P2 caused by the difference in the weight distribution can be adjusted.

The outputs of the pair of strain gauges 24 are amplified by an amplifier 25, and the subsequent outputs are output from a comparator 27 to a setting unit 2.
6 and then input to the control device 21.
Then, the pressure oil of the third pump 28 is supplied to the rolling cylinder 1.
When the set output value of the setter 26 and the detected output value of the strain gauge 24 are different, the control device 21 switches the electromagnetic proportional control valve 29 for supplying and discharging to and from the control valve 2 so that the two detected values match. A series of these control mechanisms and the above-described pair of balance springs 14 constitute a balance adjusting mechanism 20.

That is, when the setting device 26 is operated to the center position, the center of gravity of the seedling mounting table 10 is set to coincide with the axis P2. The rolling cylinder 12 is extended and retracted so that the moment around the axis P2 generated due to the difference in the weight distribution in the above-mentioned step is canceled and the value becomes zero. As shown in FIG. 1, a tongue piece 30 is fixed to the lower end on the rear side of the seedling mounting table 10, and
A normally-closed microswitch 31 which is turned on by the lateral movement of 0 to be in a conductive state by swinging the operation piece 31a is fixed to the planting case 4 side. The microswitch 31 is connected to the control device 21
The switch is momentarily turned on only when the seedling mounting table 10 has just reached the center position in the left and right direction, and at that time, the detection of the right and left balance by the strain gauge 24 is activated. It functions as a reference value for balance control until the switch is turned on. Also, 4
Reference numeral 0 denotes an on / off switch of the balance adjustment mechanism 20.

As shown in FIG. 1, in this rice transplanter, a switching mechanism 3 for switching the amount of pressurized oil to a control valve 19 for raising and lowering between high and low stages.
4 are provided. That is, an electromagnetic switching valve 37 is provided for switching between a low-speed state in which the supply of pressure oil to the rolling control valve 17 is performed only by the pump 35 and a high-speed state in which both the first and second pumps 35 and 36 are provided. A circuit for supplying the pressure oil after passing through the rolling control valve 17 to the control valve 19 for raising and lowering, and the neutral position of the lifting lever 38 for manual operation of the control valve 19 for raising and lowering (the state shown in FIG. 1) The switching valve 37 is switched to a high-speed side by an operation to a position other than. As a specific example, there is provided a switch 39 which is turned off only when the lifting / lowering lever 38 is at the neutral position, and the switching valve 37 is an electromagnetic switching valve which switches to a high-speed state when the switch 39 is turned on. A configuration in which the switching valve 37 is switched in conjunction with a planting clutch (not shown) instead of the elevation lever 38, that is, the switching valve 37 is switched to a high-speed side when the planting clutch is disengaged. It may be something.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a control system of a balance adjusting mechanism.

FIG. 2 is a front view of a seedling mounting table.

FIG. 3 is a side view of the planting device.

[Explanation of symbols]

 Reference Signs List 10 seedling mounting table A lateral feed mechanism C planting mechanism B planting device D balance detecting means E balance adjusting means

Claims (1)

(57) [Claims] 1. A with the planting operation of the planting mechanism (C), plant
A transverse feed mechanism (A) for reciprocally moving the seedling mounting table (10) to the left and right with a predetermined stroke amount with respect to a fixed portion of the planting device (B), and fixing the planting device (B).
Equilibrium detecting means (D) for detecting a lateral weight balance of the seedling mounting table (10) with respect to the part, and the weight balance state detected by the equilibrium detecting means (D) is set to the predetermined seedling. The above-mentioned planting equipment of the mounting table (10)
In order to match a predetermined weight balance state in the left-right direction with respect to the fixed part of the placement (B) , based on the detection information by the balance detection means (D), in the left-right direction caused by the lateral movement of the seedling mounting base (10). A balance adjusting mechanism for a rice transplanter, comprising a balance adjusting means (E) for canceling and suppressing a change in weight balance of the rice transplanter.