JP2017195840A - Rice planting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure that is simple and reduced in the number of parts in an electric height adjustment mechanism of a leveling device, while preventing breakage by the sharp push-up to the leveling device.SOLUTION: A rice planting machine includes a leveling device, a support link mechanism for supporting the leveling device in a vertically movable manner, and height-adjusting means for adjusting the height of the leveling device by an electric motor. The height-adjusting means includes an electric drive source, a turning member turned by the drive of the electric drive source, and a supported member supported from the lower part by the turning member and vertically moving the leveling device through the support link mechanism with the turning by the turning member. The movement of the supported member to the upper part is permitted while the supported member is supported by the turning member.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a rice transplanter provided with a leveling device.

  Patent Document 1 discloses a mechanism having a configuration that electrically adjusts the height of the leveling device. Here, the rise of the leveling device due to stones falling on the field is detected to raise the seedling platform, and the revolving arm is installed in the link mechanism from the electric drive source to the vertical movement of the leveling device. By including, the breakage of the adjusting mechanism that may occur when the leveling device is greatly raised is prevented.

JP 2013-176331 A

  It can be said that the technology that makes it possible to adjust the height of the leveling device electrically is desirable from the viewpoint of reducing the heavy weight of the leveling device and the burden on the operator. And it is desirable to provide the mechanism for preventing the damage by the pushing-up of the leveling device also in the electric height adjusting mechanism.

  On the other hand, considering the space margin at the arrangement position of the leveling device, there is also a demand for a compact height adjustment mechanism. As described above, it can be said that the electric height adjusting mechanism of the leveling device is required to have a simple structure with a small number of parts while preventing damage due to sudden thrusting to the leveling device.

  In a rice transplanter comprising a leveling device, a support link mechanism that supports the leveling device so as to be movable up and down, and a height adjustment device that electrically adjusts the height of the leveling device, the height adjustment device is electrically driven. And a rotating member that is rotated by driving of the electric drive source, and is supported from below by the rotating member, and the ground leveling is performed via the support link mechanism as the rotating member rotates. A supported member that moves the apparatus up and down, and the supported member is allowed to move upward in a state where the supported member is supported by the rotating member.

  The supported member is guided in an arc shape around a link support shaft that is closest to the supported member among the support link mechanisms that move up and down the leveling device.

  The output shaft of the electric drive source, the rotating shaft of the rotating member, and the rotating shaft of the link support shaft are arranged in parallel to each other.

  The height adjusting device includes fixing means for fixing the leveling device at a raised position.

  ADVANTAGE OF THE INVENTION According to this invention, in the electric height adjustment mechanism of a leveling apparatus, the structure which is simple and has few components can be provided, preventing the damage by the sudden pushing up to the leveling apparatus.

Side view showing the overall structure of the rice transplanter The top view which shows the float and leveling apparatus which are provided in a planting part The perspective view which shows the whole structure of a leveling device The perspective view which shows the internal structure of the height adjustment apparatus of a leveling device Side view showing the internal structure of the height adjustment device The figure which shows the mode of accommodation with the height adjustment device of the leveling device Diagram showing the internal structure of the transmission case Side view showing the inclination of the input shaft of the transmission case

  FIG. 1 is a diagram illustrating an overall configuration of a rice transplanter. As shown in FIG. 1, the rice transplanter 1 includes an engine 2, a power transmission unit 3, a planting unit 4, and a lifting unit 5. The planting unit 4 is connected to the airframe via the lifting unit 5. By controlling the operation of the lifting unit 5, the planting unit 4 can be automatically lifted up and down. The planting unit 4 is driven by the power transmitted from the engine 2 to the planting unit 4 via the power transmission unit 3. The rice transplanter 1 plants seedlings in the field by the planting unit 4 while traveling by driving the engine 2.

  The driving force from the engine 2 is transmitted to the PTO shaft 7 through the transmission 6 in the power transmission unit 3. The PTO shaft 7 is provided to protrude rearward from the transmission 6. Power is transmitted from the PTO shaft 7 to the planting center case 8 via the universal joint, and the planting unit 4 is driven. A drive shaft 9 is provided rearward from the transmission 6, and a driving force is transmitted from the drive shaft 9 to the rear axle case 10. A leveling drive shaft 11 extends further rearward from the rear axle case 10, and a driving force is transmitted from the leveling drive shaft 11 to a leveling device 30 (to be described later) through a universal joint.

  The planting unit 4 includes a planting arm 12, a planting claw 13, a seedling stage 14, a float 15, a leveling device 30, and the like. The planting claw 13 is attached to the planting arm 12. The planting arm 12 is rotated by the power transmitted from the planting center case 8. A seedling is supplied to the planting claw 13 from a seedling stage 14. Then, along with the rotational movement by the planting arm 12, the planting claws 13 are inserted into the field, and seedlings are planted so as to have a predetermined planting depth (the amount of nail protrusion of the planting claws 13). In this embodiment, a rotary planting claw is employed, but a crank type may be used.

  FIG. 2 is a diagram illustrating a configuration of a planting unit of the rice transplanter. As shown in FIG. 2, the planting unit 4 has a plurality of floats arranged in the left-right direction (this embodiment shows a six-planted rice transplanter, and a center float 15A leveling the center two segments, its Two side floats 15B) that are arranged on the sides and level the two sides are provided. Each of the floats 15A and 15B is attached to a planting frame 51 located at the lower part of the planting unit 4. More specifically, the front end of each float is supported so as to be swingable in the vertical direction with respect to the planting frame 16, and the rear end of each float is linked to the rotation support shaft 17 provided on the planting frame 51. It is attached to be movable up and down via.

  A leveling device 30 for headland leveling is disposed in front of the float 15. A part of the power from the drive shaft 9 is branched to the leveling drive shaft 11 via the rear axle case 10 and transmitted from the leveling drive shaft 11 to the leveling transmission shaft 31 via the universal joint. And it transmits to the drive shaft 35 extended toward the both sides through the universal joint 32, the input shaft 33, and the transmission case 34 from the leveling transmission shaft 31. A plurality of rotors 36 are fixed to each drive shaft 35, and the rotor 36 is rotated by the rotational drive of the drive shaft 35 so that the field is leveled.

  The leveling device 30 is arranged in such a manner that the center is arranged forward and is inclined from the front to the rear as it goes from the center to both sides. That is, the transmission case 34 disposed in the center is provided so as to be positioned in front of the drive shaft 35 and the rotor 36, and is disposed in a letter C shape when viewed from above. With such a configuration, a space is secured behind the center portion of the leveling device 30, and the center float 15A can be disposed near the front using the space.

  Here, the center float 15A disposed at the center is used as a sensing float for detecting the agricultural field ground contact surface. Specifically, the planting part height (distance between the field and the planting part 4) is determined from the angle of the center float 15A that swings up and down in accordance with the unevenness of the rice field. In the present embodiment, the accuracy of sensing by the center float 15A is improved by arranging the center float 15A forward using the configuration of the leveling device 30.

  Next, with reference to FIG. 3 to FIG. 5, the overall configuration and support structure of the leveling device 30 will be described. FIG. 3 is a front perspective view showing the overall configuration of the leveling device. FIG. 4 is an enlarged rear perspective view showing the internal structure of the height adjusting device of the leveling device. FIG. 5 is an enlarged side view showing the structure of the height adjusting device of the leveling device, and is a side view seen from the right of the rice transplanter.

  The leveling device 30 is attached to the seedling stage frame 50 of the planting unit 4 via the support link mechanism 40. The support link mechanism 40 supports the leveling device 30 such that it can move up and down (turn) with respect to the planting unit 4. That is, the leveling device 30 (the transmission case 34, the drive shaft 35, and the leveling rotor 36) can change the height with respect to the planting part 4 according to the raising and lowering of the support link mechanism 40.

  The support link mechanism 40 connects the link support shaft 41 provided along the extending direction (the left-right direction of the machine body) of the leveling device 30, the links 42 fixed to both ends of the link support shaft 41, and the link 42 and the leveling device 30. In addition, a support arm 43 that supports the leveling device 30 and an auxiliary link 44 that connects the lower end of the support arm 43 and the seedling support frame 50 are provided.

  The link support shaft 41 is rotatably supported by the seedling stage frame 50 via the arm 45 at both ends. Thus, in the support link mechanism 40, the link 42 rotates and the support arm 43 moves up and down as the link support shaft 41 rotates, so that the seedling mounting frame 50 (planting unit) of the leveling device 30 is moved. The height with respect to 4) can be changed.

  An electric height adjusting device 60 that rotates the link support shaft 41 is provided on the middle of the link support shaft 41 toward the right side of the machine body. By operating the height adjusting device 60, the link support shaft 41 can be rotated to adjust the height of the leveling device 30. The height adjusting device 60 is supported by the seedling stand frame 50.

  The seedling stand frame 50 includes a planting frame 51 having a square pipe structure, a side frame 52 provided upward from both side end portions of the planting frame 51, and a rolling arm that is passed to the upper and lower middle portions of the side frame 52. 53 and a pin holder 54 passed to the upper end of the side frame 52.

  Brackets 57 to which the auxiliary links 44 of the support link mechanism 40 are fixed are provided on both sides of the planting frame 51. On both sides of the rolling arm 53, brackets 58 to which the arm 45 of the support link mechanism 40 is fixed are provided. A bracket 59 for fixing the height adjusting device 60 is provided on the rolling arm 53. Then, the auxiliary link 44 is fixed to the bracket 57, the arm 45 is fixed to the bracket 58, and the height adjusting device 60 is fixed to the bracket 59, so that the support link mechanism 40 and the leveling device 30 are transferred to the seedling stand frame 50. Supported by

  The height adjusting device 60 includes a rotation bracket 61, a guide pin 62, a support frame 63, a guide hole 64, a sector gear 65, an electric motor 66, a potentiometer 67, and the like in the cover 70.

  The rotating bracket 61 is a member that is fixed to the link support shaft 41 and protrudes in the radial direction of the link support shaft 41. The link support shaft 41 is rotated with the rotation of the rotation bracket 61. A guide pin 62 protruding toward the side (the axial direction of the link support shaft 41) is provided at the tip of the rotating bracket 61. The link support shaft 41 is a link member that is closest to the guide pin 62 in the support link mechanism 40. The weight of the leveling device 30 applied to the link support shaft 41 is transmitted to the guide pin 62 via the rotation bracket 61.

  The support frame 63 is a flat plate-like member that is fixed to the rolling arm 53 via the bracket 59. The support frame 63 is provided along the radial direction of the link support shaft 41. A cover 70, an electric motor 66, and a potentiometer 67 are fixed to the support frame 63, and a sector gear 65 is rotatably provided. A guide hole 64 through which the guide pin 62 is inserted is formed in the middle portion of the support frame 63. The guide hole 64 is formed in an arc shape around the link support shaft 41.

  The sector gear 65 is a rotating member that is rotatably supported by the support frame 63. The sector gear 65 is a fan-shaped gear and functions as a support member that directly supports the guide pin 62 on its upper surface. In other words, the weight applied to the guide pin 62 as a supported member is supported from below by the sector gear 65, and as a result, the load applied to the rotating bracket 61 provided with the guide pin 62, that is, fixed to the rotating bracket 61. The weight of the leveling device 30 applied to the link support shaft 41 is supported from below by the sector gear 65 via the guide pins 62.

  The electric motor 66 is an electric drive source that rotationally drives the sector gear 65, and has an output gear (both not shown) that meshes with the gear of the sector gear 65 on its output shaft. The output shaft of the electric motor 66 is disposed so as to be parallel to the axial direction of the link support shaft 41. That is, the output direction of the electric motor 66 is set in the left-right direction of the machine body, and the direction of the output shaft is the same as the direction of the rotation shaft of the sector gear 65 and the direction of the rotation shaft of the link support shaft 41. Placed in. Thus, by arranging the output directions of the members in parallel, the thickness when the members are arranged can be suppressed, and the height adjusting device 60 can be accommodated in a compact manner. This eliminates the need for a large space for installing the height adjusting device 60 in the space on the back side of the seedling table 14 that is crowded with piping, wiring, etc., and allows freedom in layout on the back side of the seedling table 14. It is possible to improve the degree.

  The radius of the sector gear 65 is set larger than the radius of the output gear of the electric motor 66. From this, the output of the electric motor 66 is decelerated by the sector gear 65 and transmitted. The operating position of the guide pin 62 that is the output destination is set to a position different from the rotation fulcrum of the sector gear 65. The position of the guide pin 62 is disposed on the inner side of the output fulcrum of the sector gear 65 with respect to the output point of the electric motor 66. Further, the distance between the rotation fulcrum of the sector gear 65 and the guide pin 62 is set to be smaller than the rotation radius of the guide pin 62 (the distance between the link support shaft 41 and the guide pin 62). The transmission of power from 65 to the guide pin 62 is also decelerated. As described above, the output of the electric motor 66 can be efficiently transmitted to the link support 41 by performing two-stage deceleration in the transmission path from the electric motor 66 to the link support 41.

  In such a configuration, the potentiometer 67 can obtain a more accurate detection value by detecting the rotation angle of the rotation shaft of the sector gear 65, and use the detection value of the electric motor 66. More accurate control is possible when controlling the output.

  The cover 70 is an exterior covering the height adjusting device 60, and in particular, is a protective member that protects the electric system including the electric motor 66. As shown in FIG. 5, a part of the cover 70 is cut out on the side opposite to the side on which the rotating bracket 61 is disposed, and the guide hole 64 and the guide pin 62 in the guide hole 64 are cut through the cutout. It is possible to visually check the position of the ground leveling device 30, making it easy to make initial settings and check for problems when adjusting the height of the leveling device 30.

  As shown in FIGS. 4 and 6, a fixing hole 68 is formed in the support frame 63. A fixing hole 69 that can communicate with the fixing hole 68 is formed at a position corresponding to the fixing hole 68 of the rotating bracket 61. Specifically, the fixing hole 68 is provided near the link support shaft 41 that is the rotation center of the rotation bracket 61 with respect to the guide pin 62 and corresponds to the position where the guide pin 62 has moved to the uppermost position. It is provided in the position to do. The fixing hole 69 is provided in the rotating bracket 61 so as to be the same distance as the distance between the link support shaft 41 and the fixing hole 68. When the guide pin 62 moves to the uppermost position, the rotation bracket 61 can be fixed at that position by inserting the fixing pin through the fixing holes 68 and 69.

  As described above, by using the fixing holes 68 and 69, the rotation bracket 61 can be maintained at the uppermost position. That is, the state where the leveling device 30 is stored in the uppermost position can be maintained. Thereby, even when the function of the height adjusting device 60 is hindered, it is possible to continue the planting operation with the leveling device 30 stored. At this time, if there is a problem with the electric motor 66, the leveling device 30 can be lifted manually.

  As described above, the height adjusting device 60 drives the sector gear 65 by the electric motor 66 and moves the guide pin 62 up and down along the guide hole 64 in an arc shape, thereby rotating the pivot bracket 61 (link support shaft). 41) is rotated to adjust the height of the leveling device 30. At this time, the guide pin 62 that receives the weight of the leveling device 30 is supported by the sector gear 65 from below, so that upward movement is permitted. That is, when the reaction force from the ground is applied to the leveling device 30 adjusted to a predetermined height by the height adjusting device 60 and the upward push-up occurs, the guide pin 62 is allowed to move upward. Therefore, a large external force suddenly applied to the leveling device 30 and the support link mechanism 40 can be released upward. As described above, in the leveling device 30 including the electric height adjusting device 60, it is possible to prevent the main body of the leveling device 30 from being damaged when receiving an excessive reaction force from the ground. In the height adjusting device 60 of the present embodiment, the guide pin 62 is not allowed to move upward using a spring, a link mechanism, or the like. An avoidance mechanism can be provided.

  Next, with reference to FIG.7 and FIG.8, the structure in the transmission case 34 of the leveling apparatus 30 and the input shaft 33 are demonstrated.

  As shown in FIG. 7, the input shaft 33, the idler shaft 80, and the drive shaft 35 are disposed in the leveling transmission case 34. A bevel gear 81 is fixed to the end of the input shaft 33. The bevel gear 81 meshes with a bevel gear 82 fixed to the middle part of the idler shaft 80. Tapered gears 83 are disposed at both ends of the idler shaft 80. The taper gear 83 meshes with a spur gear 84 provided at the end of the drive shaft 35. The spur gear 84 may be a tapered gear.

  As described above, in the drive system of the leveling device 30, the leveling transmission case 34 is arranged in the center, and the drive shafts 35 on both the left and right sides are inclined rearward with respect to the center. Therefore, in the leveling transmission case 34, the drive shaft 35 is disposed laterally around the input shaft 33, and the idler shaft 80 is disposed between the input shaft 33 and the drive shaft 35, whereby the drive shaft 35 is disposed on both sides. The direction of rotation is the same.

  The idler shaft 80 is disposed behind the input shaft 33, and the idler shaft 80 meshes with the drive shaft 35 from the rear side. Thus, by arranging the idler shaft 80, the position of the input shaft 33 can be moved backward. Thereby, the leveling transmission case 34 can be comprised compactly, and between irregular regions can be made small.

  That is, as shown in FIG. 7, the intersection point Q of the central axes of the drive shafts 35 arranged on the left and right sides is located in the middle of the input shaft 33 in the leveling transmission case 34. For this reason, the bevel gear 81 of the input shaft 33 and the bevel gear 82 of the idler shaft 80 mesh with each other behind the intersection Q, and the size of the leveling transmission case 34 in the front-rear direction can be made compact. Further, the idler shaft 80 is disposed offset to the rear of the input shaft 33 and the drive shafts 35 and 35, thereby preventing the lateral width of the leveling transmission case 34 from increasing. Thus, the leveling transmission case 34 is configured to reduce the width in the left-right direction while reducing the width in the front-rear direction.

  As shown in FIG. 8, the input shaft 33 is provided so as to be inclined upward with respect to the horizontal direction. Transmission of power to the input shaft 33 is performed via the universal joint 32, but the rear axle case 10 that is a source of the power for the ground leveling device 30 is disposed above. Therefore, if the operating angle of the universal joint 32 becomes too large, a problem that the life of the universal joint 32 is shortened is included. However, as in this embodiment, the input shaft 33 is provided at the front height and the rear height and tilted upward, thereby reducing the load by reducing the folding angle of the universal joint 32, thereby extending the life. .

  Further, in the power transmission structure in the transmission case 34, the input shaft 33 is merely tilted, and the portions other than the input shaft 33 are disposed horizontally to have the drive shaft of the rotor 36 on the same plane. Thereby, the power transmitted from the input shaft 33 can be efficiently transmitted to the rotor 36.

  DESCRIPTION OF SYMBOLS 1: Rice transplanter, 30: Leveling device, 40: Support link mechanism, 41: Link spindle, 50: Seedling stand frame, 60: Height adjusting device, 61: Rotating bracket, 62: Guide pin (Supported member) ), 63: support frame, 64: guide hole, 65: sector gear (rotating member), 66: electric motor (electric drive source)

Claims (4)

In a rice transplanter comprising a leveling device, a support link mechanism that supports the leveling device so as to be movable up and down, and a height adjustment device that electrically adjusts the height of the leveling device.
The height adjusting device is supported from below by an electric drive source, a rotating member that is rotated by driving the electric drive source, and with the rotation of the rotating member. A supported member that moves the leveling device up and down via the support link mechanism,
The rice transplanter characterized in that the supported member is allowed to move upward while the supported member is supported by the rotating member.   2. The rice transplanter according to claim 1, wherein the supported member is guided in an arc shape centered on a link support shaft that is closest to the supported member in a support link mechanism that moves up and down the leveling device.   The rice transplanter according to claim 2, wherein the output shaft of the electric drive source, the rotation shaft of the rotation member, and the rotation shaft of the link support shaft are arranged in parallel to each other.   The said height adjustment apparatus is a rice transplanter as described in any one of Claim 1 to 3 provided with the fixing means which fixes the said leveling apparatus in the raised position.

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