KR910002412B1 - Mechanism for driving planting claw of transplantation machine - Google Patents

Abstract

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Description

Transplanting drive mechanism of rice transplanter

1 is a cross-sectional plan view of an implant drive mechanism according to the present invention.

2 is a side view showing all and part of a gear.

3 is a characteristic diagram showing the relationship between the rotation angle of a transplant case and the rotation angle of a transplantation vessel (support case).

4 is a side view showing a part of the gear train when entering the seedling exit.

5 is a side view of an implant mechanism.

Figure 6 is a longitudinal sectional view of the graft support case.

7 is a side view showing a seedling transplant unit of the rice transplanter.

* Explanation of symbols for main parts of the drawings

1: transplant transmission case 2: transplant case

3: transplant tank 4: seedling support

7: drive shaft 11: sun gear

13: support shaft 20: final gear

22, 23: middle gear

The present invention relates to a transplanter drive mechanism of a rice transplanter configured to perform transplantation twice by one rotation of the implantation case by attaching a transplantation tank to both ends of a rotationally driven implantation case.

As the graft drive mechanism described above, for example, as shown in Japanese Patent Application Laid-Open No. 60-221009, a rotation in a graft case in which the graft case is fixed and connected to a drive shaft that protrudes laterally from the graft transmission case and rotates is driven. Arranged in a fixed state with respect to the implanted transmission case in which the solar gear is electrically placed on the center, a pair of implants are provided at both ends of the implanted case, and the final gear is fixed to the support shaft supporting the implant. A pair of first intermediate gears and a second intermediate gear that rotates integrally therewith are disposed between a sun gear and a final gear, and each includes a gear having a diameter different from each other by the sun gear, the intermediate gear, and the final gear. It consists of gear trains to determine the postures of both grafts for each rotational phase during rotation of the graft case. The seedlings can not stand configured to move from the seam shifts ttenae've packaging (圃 場) to the seedling.

The above-mentioned known means uses a gear train formed by a sun gear, an intermediate gear and a final gear as a gear train including gears of different diameters, and rotates the implantation tank at an inconstant speed while opposing the revolution direction. Rotational direction, and the posture during the movement of the graft is gradually corrected, and the trajectory of the graft front end is set in the shape of a long vertical loop from the bottom of the seedling support to the pavement surface. The loop of the front leading trajectory of the jaw was considerably wider in width than the loop of the front leading trajectory of the implant in the conventional oscillating implant drive mechanism.

Therefore, when transplanted into the locus loop at the front end of the large graft, the graft traces of the graft surface remained, and the seedlings to be transplanted or floated easily.

Considering the shortcomings of the above-described conventional means, since the eccentric gears or the ellipse gears have different diameters included in the gear train for inconstant rotation in the implantation tank, the change factor of the inconstant speed characteristics is eccentricity and ellipse in the eccentric gears. In gears, there is only a ratio between a long diameter and a short diameter, and there is little freedom in setting the inconstant speed rotation characteristics of the graft with respect to the rotation of the graft case, and this causes the graft leading loop loop having a large front and rear width.

The present invention has been made in view of such a situation that the rotation of the graft case with the desired characteristics to rotate at an inconstant speed can obtain a small forward and backward trajectory loop loop, moreover, each gear can be smoothly engaged and operated smoothly. It is an object of the present invention to provide a transplantation drive mechanism and a rice transplanter capable of performing good transplantation using the transplantation drive mechanism.

Furthermore, the present invention is to provide a gear for lengthening the port leading trajectory vertically in the implant drive mechanism of the implant case rotation as a highly durable one.

Features of the present invention for achieving the above object, ① The sun gear, the intermediate gear and the final gear is composed of a non-circular gear, respectively, and the required deviation between the rotation angle of the implant case and the rotation angle of the implantation tank is approximately 1 / 2, each of which is configured to be shared by the engagement between the sun gear and the first intermediate gear and the engagement between the second intermediate gear and the final gear, and ② preferably, in addition to the above-described configuration From the time corresponding to the time of initiation to the time when the transplantation tank is equivalent to the time of escape from the non-surface, the rotational angular velocity of the transplantation case and the absolute value of the rotational angular velocity of the transplantation vessel are the same or almost the same. Between the above two points, the absolute velocity of the moving speed and the moving speed of the main body to the rear of the moving direction of the main body of the implant body. Is set equally, and more preferably, ③ the lower teeth of each gear are composed of teeth formed by a curve in which the curvature continuously changes, and the tip of the transplanting vessel inserted into the seedling outlet of the seedling support is rotated. In phase, the tool pressure angle of the tooth and the height of the tooth tip are set such that the engagement line at the engagement portion of each gear most approaches or passes through the curve portion below the tooth.

According to the above-described configuration, the shift characteristic (transplant arm rotation angle-rotation angle of the transplantation tank) required for forming the front end track loop of the transplantation tank to the desired longitudinal length is set as A in FIG. The shift characteristic (B) in which the difference between (A) and the reference constant velocity characteristic (C) is approximately 1/2 is in charge by the engagement between the sun gear and the first intermediate gear, and the rest of the second intermediate gear and the final gear. By engaging with the gears, the shifting characteristics of the sun gear and the first intermediate gear and the shifting characteristics of the second intermediate gear and the final gear are almost equal and the angular velocity ratio curve for each gear Each becomes a smooth thing with few changes. In addition, the shift characteristic A shown in FIG. 3 is equivalent to the reference constant velocity in the period corresponding to the time when the transplantation tank enters the paddy surface and escapes from the paddy surface (150 ° -200 ° as the rotation angle of the transfer case). Nearly parallel to characteristic (C), the graft is rotated in the opposite direction of the revolution at approximately the same angular velocity with respect to the rotation of the implant case.

In other words, the graft enters the rice paddy surface and escapes with almost constant standing posture. In the meantime, if the absolute value of the moving speed of the implant body toward the instrument body in the rearward direction of the implant body is substantially the same as the absolute value of the instrument body forward speed, the trace of the implant vessel formed on the non-surface surface is minimized.

Furthermore, at the seedling exit of the seedling support, when the transplantation tank is locked with foreign matter such as gravel, the safety clutch interposed in the driving system of the transplantation tank is operated momentarily. A shockingly large torque is applied and a large tooth bending moment is received by the load acting on the meshed portion, but this meshing load acts along the engagement line and is extremely close to or curved under the teeth. Pass the part. Therefore, the bending stress is dispersed in the base portion of the curved shape of the tooth as a cantilever beam.

As a result, compared to the conventional means of injecting eccentric gears or elliptical gears with the implants in an inconstant speed rotation, the front end trajectory of the implant was set to a longer vertical loop so that the traces of the implant could be removed. A small transplant can now be performed.

In particular, it is possible to almost equally assign the shifting characteristics of the transplantation tank necessary to obtain the desired trajectory loop of the transplantation tank to each stage of the two-stage gear train composed of non-circular gears. Less smooth, that is, each gear can be a gear of the pitch curve which suppresses the sudden change of the radius of the curve, and smooth engagement shifting can be performed without difficulty at each end.

In addition, since the shift characteristics at each shift stage are approximated, the gear shape is similar, for example, when cutting, it is possible to use the same gear material and can be advantageously manufactured.

Furthermore, in a non-circular gear train that satisfies the inconstant speed motion to obtain the loop of the graft leading trajectory as required by the graft drive mechanism of this machine, when foreign matter such as gravel is inserted into the seedling exit of the seedling support, it is interposed in the graft drive system. It is possible to operate well for a long period of time without the breakage of the tooth even when the shock clutch is operated when a safety clutch is operated and excessive torque is applied to the gear train.

EMBODIMENT OF THE INVENTION Hereinafter, the seedling transplanting apparatus of the riding type rice transplanter is described based on drawing.

As shown in FIG. 7, two pairs of two pairs are supported at both ends of the implanted case 2 while the implanted case 2 is supported so as to rotate freely around the transverse center P at the rear end of the implanted transmission case 1. A transplantation tank 3 is provided and two pairs of transplantation tanks 3 are alternately removed from the seedling outlet 4a at the lower end of the seedling support 4 and transplanted into the package as the transplantation case 2 rotates. Consists of.

In the lower part of the aforementioned transmission transmission case (1), a float (5) for stopping and maintaining posture is installed, and the seedling implanter is interposed through a four-wheel link (6) in parallel. It is connected to the rear of the driving mechanism body (not shown) to freely lift.

Next, the structure of the implantation case 2 is described in detail. As shown in FIG. 1, the drive shaft 7 protrudes from the implantation transmission case 1 to the left and right along the horizontal axis center P, and the drive shaft 7 The implanted case 2 fixed to both ends of the c) is fixed, and power is transmitted via a chain 9 to a manual sprocket 8 provided at a central portion of the drive shaft 7. In addition, a cylindrical shaft 10 fixed to the transmission transmission case 1 is fitted to the drive shaft 7, which is fixed to the implanted transmission case 1, and plunges into the implantation case 2, and at the position of the cylindrical shaft portion in the implantation case 2, the sun gear ( 11) is fixed.

Next, the implantation tank 3 and its attachment structure will be described. As shown in FIGS. 1 and 7, the fixed shaft 12 protrudes laterally from both ends of the implant case 2, and the fixed shaft A cylindrical support shaft 13 is fitted outwardly so that the cylinder 12 is movable, and the implantation tank support case 14 is fixed to this support shaft 13.

At the front end of the transplant vessel support case 14, the aforementioned implant vessel 3 is fastened by bolts, and a tool 15 for pushing the seedlings while moving freely along the implant vessel 3 is provided. The tool 15 is subjected to an elastic force in the protruding direction by a spring 16 acting as the rear end of the supporting rod 15a.

Moreover, the swinging arm 18 rotatably supported by the point shaft 17 is engaged with the back end of the rod 15a which supports the tool which pushes out a seedling, and it is connected from this swinging arm 18 successively. The installed cam follower 18a abuts against the outer circumference of the cam 19 integrally formed on the fixed shaft 12 described above.

And while the transplantation tank 3 removes a seedling from the seedling exit 4a and carries it to a pavement surface, the cam follower 18a of the rocking arm 18 acts on the large diameter part of the cam 18, as shown in figure. And the tool 15 for pushing the seedlings is retracted against the spring 16, and the cam follower 18a of the swing arm 18 is larger than the cam 18 at the time when the implantation tank 3 enters the pavement. Since the tool 15 which pushes out the seedlings is rapidly protruded by the spring 16 because it is out of the diameter part, the seedlings held by the front end of the transplantation tank 3 and the tool 15 which pushes the seedlings are pushed into the package. It is intended to be transplanted separately.

Next, the structure for determining the posture of the implantation tank 3 will be described in detail. The end gear 20 is fixed to the support shaft 12 of the support case 14 of the implantation vessel, and the sun gear which is electrically connected to the final gear 20 ( The intermediate shaft 21 is arrange | positioned between 11).

The first intermediate gear 22 engaged with the sun gear 11 and the second intermediate gear 23 engaged with the final gear 20 are fixed to the intermediate shaft 2 integrally provided. have.

The sun gear 11, the intermediate gear 22, 23 and the final gear 20 described above are each composed of the same number of teeth and non-circular gears of the same module as shown in FIG. It is manufactured by sintering molding.

The gear train by the aforementioned gear group is rotated by one rotation of the implantation vessel 2 in the opposite direction at an uneven speed with respect to one rotation (orbit) of the implantation vessel 2. In order to obtain the front end trajectory S of the transplantation tank shown in FIG. 5, the front end trajectory S is set up in a vertically long loop shape, and the support shaft 13 of the support case 14 of the transplantation tank is shown in FIG. Due to its characteristics, it is necessary to make an inconstant speed rotation, which is why the aforementioned gear group consists of non-circular gears.

In this case, the shift characteristic (B) passing about 1/2 of the difference between the shift characteristic (A) and the reference constant velocity characteristic (C) in the third degree is in engagement with the sun gear (11) and the first intermediate gear (22). It is in charge of the rest and the rest is in charge by the engagement of the second intermediate gear 23 and the final gear (20).

As a result, the pitch curves of the gears 11, 22, 23, and 20 are set according to the angular speed ratio curve required for the angular shift stage so that the desired shift characteristic A is finally obtained by the two-speed shift. .

The shifting characteristic A described above is the constant constant velocity characteristic of the reference for a considerable time (150 ° -200 ° as the rotation angle of the transfer case) until the transplantation tank 3 enters the paddy surface and escapes from the paddy surface. It is almost parallel to (C) and the implantation tank 3 rotates in the opposite direction at an angular velocity almost equal to the rotational angular velocity of the implantation case 2.

Therefore, the implantation tank 3 enters into the paddy surface and escapes in a substantially constant posture between these.

In addition, since the absolute value of the moving speed toward the back of the instrument body traveling direction and the absolute value of the mechanism body forward speed are set to be substantially the same between the instrument body of the implantation tank 3, traces of the implantation tank formed on the paddy surface are minimized. .

Moreover, the non-circularity degree of each gear 11, 22, 23, 20 is

to be.

In addition, the gear train and the specifications of the gears include the shaft distance between the sun gear 11 and the first intermediate gear 22 = 40 mm, and the shaft distance between the second intermediate gear 23 and the final gear 20 = 40 mm.

Modul m = 2.0

Tool pressure angle α = 25 °

Tooth height = 1.2 m (module) or less

Set the toeside to form a curve with continuously changing curvature, and also create a round of moderate radius for the addendum.

4 shows a state in which the gear row in the rotational phase where the front end of the implantation tank 3 has entered the seedling outlet 4a of the seedling support 4 is engaged.

In this state, foreign matter such as gravel is inserted into the seedling exit 4a, and the implantation tank 3 is locked so that the safety clutch (not shown) interposed in the transmission system of the implantation vessel slips, In other words, the maximum load acts on the gear train.

And as can be clearly seen, since the teeth of each gear 11, 22, 23, 20 are set as described above, the engagement line at the engagement portion most closely approaches the continuous curve portion formed under the teeth, Will pass.

In this way, the engagement action line (D), and eventually the load action line, passes near the curved portion under the tooth, so that even if an excessive load is applied, the durability is high for stress distribution at the base portion of the tooth.

If the non-circular gears satisfying the inconstant motion to obtain the loop of the graft trajectory are made into the normal involute value, the occurrence of under cut in the phase with small curvature radius of the pitch curve Inevitably, the durability of the tooth becomes low, but according to the above configuration, such a problem does not occur. Furthermore, in order to further increase the strength of the teeth, the pressure angle of the tool may be set to 25 ° -28 °.

Claims (3)

The non-circular sun gear 11 is electrically connected to the center of rotation in the implanted case 2 by fixing the implanted case 2 to the driving shaft 7 which protrudes laterally from the implanted transmission case 1 and rotates. Support shafts 13 which are arranged in a fixed state with respect to one implantation transmission case 1 and have a pair of implantation vessels 3 at both ends of the transplantation case 2 described above, and support the implantation vessel 3. A non-circular first intermediate gear 22 and a non-circular agent which are integrally rotated between the sun gear 11 and the final gear 20 fixed to the non-circular end gear 20 in the The second intermediate gear 23 is arranged in pairs, and includes a gear having a different diameter by the sun gear 11, the first intermediate gear 22, the second intermediate gear 23, and the final gear 20. In addition to the gear train, the implanted case 2 described above corresponds to each phase of rotation during rotation. The rotation of the transplantation vessel 3, which is rotated at constant speed, is rotated one rotation in the opposite direction at an inconstant speed by giving a proper deviation to the rotation angles of both implantation vessels 3 at constant speed. In the transplanting tank drive device of the rice transplanter which is configured so that the required deviation between the rotation angle of the transplant case 2 described above and the rotation angle of the implantation vessel 3 described above is about 1/2 of the solar gear 11 A transplantation tank drive mechanism for a rice transplanter, characterized in that the first intermediate gear (22) is engaged with the second intermediate gear (23) and the final gear (2). The transplantation tank according to claim 1, wherein the transplantation tank (3) described above corresponds to a time when the transplantation tank (3) corresponds to the time at which the transplantation tank (3) enters the non-surface. The rotational angular velocity of 2) and the absolute value of the rotational angular velocity of the transplantation vessel 3 described above are the same or almost the same, and between the two points in time described above, the back of the instrument body advancing direction with respect to the mechanism body of the implantation vessel portion An transplanter drive mechanism of a rice transplanter, wherein the moving speed and the absolute value of the mechanism body forward speed are set equally. The curvature of claim 1 or 2, wherein the curvature of the sun gear 11, the first intermediate gear 22, the second intermediate gear 23, and the final gear 20 changes continuously. Each gear 11, 22, 23 (formed in the rotational phase where the front end of the implantation tank 3, which was formed in a curved tooth shape and entered into the seedling outlet 4a of the seedling support 4) 20. The transplanting tank drive mechanism of the rice transplanter characterized by setting the tool pressure angle of the tooth and the height of the tooth tip so that the engagement action line at the engagement portion most approaches or passes through the curved portion under the tooth.

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