CN106576536B - Coaxial double-rod ejection type eccentric gear-non-circular gear planetary system seedling throwing mechanism - Google Patents
Coaxial double-rod ejection type eccentric gear-non-circular gear planetary system seedling throwing mechanism Download PDFInfo
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C11/00—Transplanting machines
- A01C11/006—Other parts or details or planting machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
- F16H37/12—Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these types
- F16H37/124—Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these types for interconverting rotary motion and reciprocating motion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H53/00—Cams ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
- F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
- F16H53/025—Single-track cams for single-revolution cycles; Camshafts with such cams characterised by their construction, e.g. assembling or manufacturing features
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Abstract
The invention discloses a coaxial double-rod ejection type eccentric gear-non-circular gear planetary system seedling throwing mechanism, which comprises a gear box; the inner support of the gear box is provided with a central incomplete circular gear, an upper middle circular gear, a lower middle circular gear, an upper eccentric gear, a lower eccentric gear and an upper planetary non-circular gear; the central incomplete circular gear is fixedly connected with a convex locking arc, the upper middle circular gear is fixedly connected with an upper concave locking arc, the lower middle circular gear is fixedly connected with a lower concave locking arc, and the upper concave locking arc and the lower concave locking arc are matched with the convex locking arc; a hollow loop bar is arranged in the planting arm shell in a sliding manner, and a solid push rod is arranged in the hollow loop bar in a sliding manner; the hollow loop bar is provided with a first limiting plate, a second limiting plate and an opening and closing mechanism; the planting arm shell is internally hinged with a double-contour cam, a shifting fork and a trigger. In the invention, 2 groups of planetary gear transmissions are arranged in each gear box relative to a central gear, each group of planetary gear transmissions drive 1 seedling-throwing planting arm, and the gear box rotates for one circle, thereby realizing 2 times of seedling-throwing work and having high working efficiency.
Description
Technical Field
The invention relates to agricultural machinery, in particular to a coaxial double-rod ejection type eccentric gear-non-circular gear planetary system seedling throwing mechanism.
Background
At present, there are three main ways for mechanically planting rice: direct seeding, transplanting and throwing. Wherein the direct seeding is a disordered planting mode and has long growth period, the seedling transplanting has a seedling revival period of 5-7 days, and the growth period can be prolonged by both methods; however, the seedling throwing has no seedling revival stage, and the seedling throwing can improve the yield by 10 to 15 percent for common seedlings. In addition, the seedling throwing has the advantages of high transplanting speed and no damage to roots, and is recommended by rice planting experts as a planting agriculture with the highest yield increasing rate. However, the disordered seedling throwing operation is not beneficial to later-stage field management, influences the ventilation of rice, uniformly absorbs sunlight and soil nutrients, is easy to cause diseases and insect pests, and is not suitable for the national conditions of small field planting in China, thereby influencing the popularization of the seedling throwing machine. Therefore, the research and development of the ordered seedling throwing mechanism is the key for solving the problems.
In the early 80 s, ordered seedling throwing machines were produced and introduced into the market in japan; due to the reasons of complex structure, high requirement on processing precision, high cost, low working efficiency and the like, the rice transplanter is not popularized in a large area and only occupies less than 0.5 percent of the rice planting area.
Most of domestic seedling throwers at present adopt manual backpack seedling throwers, and the principle is that compressed air is utilized to blow out a rice bowl body, and the compressed air falls to the ground by utilizing gravity, and the rice bowl body is as same as the traditional manual seedling throwing mode, so that the problems of seedling floating, uneven distribution of seedlings and the like can not be solved although labor cost is saved. Various ordered seedling throwing mechanisms of different types are developed in China, and the seedling throwing mechanisms are typically 2ZPY-H530 type rice pot seedling row transplanting machines developed by Chinese agriculture university, air suction type small-sized hand-held rice pot seedling ordered transplanting machines developed by Shenyang agriculture university, ejector rod push-out type ordered seedling throwing mechanisms designed by Nanjing agriculture organization research institute, and in addition, eight agricultural cultivation universities in Heilongjiang, Zhejiang university, Hunan agriculture university and Guangxi university all research on the pot seedling conveying and ordering type seedling throwing mechanisms. These mechanisms have not been widely popularized for reasons of work efficiency or structure.
Disclosure of Invention
The invention aims to fill the technical gap in the aspect of seedling throwing machines and provides a coaxial double-rod ejection type eccentric gear-non-circular gear planetary system seedling throwing mechanism which is relatively small in structural size, relatively simple in structure and small in vibration.
In order to achieve the purpose, the invention adopts the technical scheme that: a coaxial double-rod ejection type eccentric gear-non-circular gear planetary system seedling throwing mechanism comprises a gear box; the inner support of the gear box is provided with a central incomplete circular gear, an upper middle circular gear, a lower middle circular gear, an upper middle eccentric gear, a lower middle eccentric gear, an upper planet non-circular gear and a lower planet non-circular gear, wherein the upper middle circular gear, the lower middle circular gear, the upper planet non-circular gear and the lower planet non-circular gear are symmetrically distributed on two sides of the central incomplete circular gear at 180 degrees; the upper middle eccentric gear is coaxially and fixedly connected with the upper middle circular gear, and the lower middle eccentric gear is coaxially and fixedly connected with the lower middle circular gear;
the central incomplete circular gear is fixedly connected with a convex locking arc, the upper middle circular gear is fixedly connected with an upper concave locking arc, the lower middle circular gear is fixedly connected with a lower concave locking arc, and the upper concave locking arc and the lower concave locking arc are matched with the convex locking arc;
the central incomplete circular gear is respectively meshed with an upper middle circular gear and a lower middle circular gear, and the upper middle eccentric gear and the lower middle eccentric gear are meshed with an upper star non-circular gear and a lower star non-circular gear; the device also comprises an upper transplanting arm and a lower transplanting arm, wherein the upper planetary non-circular gear and the lower planetary non-circular gear are coaxially connected with the upper transplanting arm and the lower transplanting arm;
the upper planting arm and the lower planting arm are identical in structure and respectively comprise a planting arm shell, a hollow loop bar is arranged in the planting arm shell in a sliding mode, a solid push rod is arranged in the hollow loop bar in a sliding mode, a loop bar spring is arranged between the tail end of the hollow loop bar and the planting arm shell, and a push rod energy-gathering spring is arranged between the solid push rod and the planting arm shell; the hollow loop bar is provided with a first limiting plate, a second limiting plate and an opening and closing mechanism; the solid push rod is provided with a buckle groove, and the opening and closing mechanism is in opening and closing connection with the buckle groove; the planting arm comprises a planting arm shell, a shifting fork, a trigger and a trigger pulling mechanism, wherein a double-contour cam, the shifting fork and the trigger pulling mechanism are hinged in the planting arm shell, the shifting fork and the trigger pulling mechanism are coaxial, one end of the shifting fork is erected between a first limiting plate and a second limiting plate, the other end of the shifting fork and one end of the trigger pulling mechanism are both abutted against the double-contour cam, the other end of the trigger pulling mechanism is in matched transmission with an opening and closing mechanism, and a trigger pulling spring is arranged between the other end; the outer end part of the hollow loop bar is provided with a seedling taking mechanism;
the planting arm shell is coaxially and fixedly connected with the upper middle eccentric gear and the lower middle eccentric gear, and the double-contour cam is fixedly connected with the gear box.
Furthermore, the central incomplete circular gear is not provided with teeth at the superposed part of the incomplete circular gear and the convex locking arc; the upper middle eccentric gear and the lower middle eccentric gear are eccentric gears with the same geometric parameters; the upper planet non-circular gear and the lower planet non-circular gear are non-circular gears with the same geometric parameters.
Furthermore, the upper star non-circular gear and the lower star non-circular gear are meshed with the upper middle eccentric gear and the lower middle eccentric gear, so that the non-uniform transmission of the transplanting mechanism is realized; the upper and lower middle circular gears and the central incomplete circular gear are in intermittent circular gear meshing transmission.
Furthermore, the opening and closing mechanism comprises a Z-shaped buckle and a Z-shaped buckle compression spring, the Z-shaped buckle is hinged to the hollow loop bar, the Z-shaped buckle compression spring is arranged between one end of the Z-shaped buckle and the hollow loop bar, and the other end of the Z-shaped buckle is connected with the buckle groove in an opening and closing mode.
Further, the double-profile cam has a first annular groove and a second annular groove thereon.
Further, the central angle range α of the first annular groove is 75-85 degrees, the central angle range β of the second annular groove is 345-350 degrees, and the included angle between the symmetry axes of the first annular groove and the second annular groove is 350 degrees
Is 100-250 degrees.
Furthermore, one end of the shifting fork is erected between the first limiting plate and the second limiting plate; the other end of shift fork and the first annular groove butt of two profile cam, the one end of trigger and the second annular groove butt of two profile cam, the other end of trigger and plant and set up trigger extension spring between the arm casing, the other end and the Z shape of trigger are detained the cooperation transmission.
Furthermore, the seedling taking mechanism comprises seedling needles which are symmetrically hinged to the outer end of the hollow sleeve rod, and seedling needle clamping springs are arranged between the seedling needles and the hollow sleeve rod.
Furthermore, the outer end of the solid push rod is fixedly connected with a trapezoidal guide block, and the trapezoidal guide block is positioned between the two seedling needles.
The invention has the following beneficial effects: most of domestic seedling throwers at present adopt manual backpack seedling throwers, and the principle is that compressed air is utilized to blow out a rice bowl body, and the compressed air falls to the ground by utilizing gravity, and the rice bowl body is as same as the traditional manual seedling throwing mode, so that the problems of seedling floating, uneven distribution of seedlings and the like can not be solved although labor cost is saved. The invention makes an innovative design for the planting arm of the seedling throwing mechanism, the clamping and ejection process of the pot seedlings are realized in two steps, a double-cam profile mechanism and a separable seedling pushing rod device are adopted, the working sequence of the traditional seedling throwing mechanism is changed, and the ejection link of the pot seedlings of rice is increased. The planting arm of the invention takes the eccentric gear-non-circular gear planetary system as an unequal speed transmission mechanism, so that the sharp point of the seedling needle forms a probing track which meets the agricultural requirements of the seedling throwing ejection mechanism; thereby overcoming the defects of a multi-rod mechanism and an intermittent mechanism, and having the advantages of simple structure, small volume, light weight, small vibration, low manufacturing cost and the like; meanwhile, 2 groups of planetary system gears are arranged in each gear box relative to the central gear for transmission, each group of planetary system drives 1 seedling separating arm, the gear box rotates for one circle, 2 times of seedling separation is realized, and the working efficiency is high.
Drawings
FIG. 1 is a schematic diagram of the mechanism of the present invention;
FIG. 2 is a schematic illustration of the transmission principle of the present invention;
FIG. 3 is a sectional view of a planting arm according to an embodiment of the present invention;
FIG. 4 is a top view of a planting arm in an embodiment of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 3;
FIG. 6 is an isometric view of a dual profile cam in an embodiment of the present invention;
FIG. 7 is a side view of the pivot shaft of the trigger and fork of the embodiment of the present invention;
FIG. 8 is a schematic view of a central angle of a first annular groove in an embodiment of the present invention;
FIG. 9 is a schematic view of the central angle of the second annular groove in an embodiment of the present invention;
FIG. 10 is a schematic view showing a positional relationship between a first annular groove and a second annular groove in the embodiment of the present invention;
FIG. 11 is a schematic diagram of 5 motion processes of a hollow shank in an embodiment of the present invention embodied on a dual profile cam;
in the figure: 1. a loop bar spring, 2 push bar energy-gathering spring, 3 hollow loop bar, 4 solid push bar, 5 shift fork, 6Z shape buckle, 7Z shape buckle compression spring, 8 buckle trigger, 9 buckle trigger extension spring, 10 double contour cam, 11 planting arm shell, 12 seedling needle, 13 seedling needle clamping spring, 14 trapezoidal guide block, 15 seedling needle fixing rack, 16 first limit plate, 17 buckle slot, 18 second limit plate, 101 first ring groove, 102 second ring groove, 19 descending star wheel shaft, 20 descending planet non-circular gear, 21 lower intermediate shaft, 22 descending intermediate eccentric gear, 23 central shaft, 24 central incomplete circular gear, 25 gear box, 26 upper intermediate shaft, 27 upper intermediate eccentric gear, 28 ascending star non-circular gear, 29 ascending star wheel shaft, 30 upper transplanting arm, 31 upper intermediate circular gear, 32. The seedling transplanting machine comprises an upper concave locking arc, a convex locking arc 33, a lower concave locking arc 34, a lower middle circular gear 35, a lower transplanting arm 36, a central chain wheel 37, a chain 38, a chain 39, a chain wheel box 40, a driving chain wheel 41, a transmission shaft 42, a flange 43 and a pot seedling tray.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in figures 1 and 2, the invention is mounted on the transmission part of the seedling throwing machine, the transmission part comprises a transmission shaft 41 in a chain wheel box 39, a driving chain wheel 40 is mounted on the transmission shaft, and is connected with a central chain wheel 37 mounted on a central shaft 23 in the chain wheel box 39 through a chain 38, the left and right shaft ends of the central shaft 23 extending out of the chain wheel box 39 are fixed with the invention with the same structure and are symmetrically arranged, the invention comprises a gear box 25, the central shaft 23 end in the gear box 25 is mounted with a central incomplete circular gear 24 fixed on the chain wheel box 39 through a flange 42, the central incomplete circular gear 24 is fixedly connected with a convex locking arc 32, and one end of the central shaft 23 is fixedly connected with the gear box 25 to rotate together; an upper intermediate shaft 26, a lower intermediate shaft 21, an upper planet wheel shaft 29 and a lower planet wheel shaft 19 are also supported in the gear box 25; the upper intermediate shaft 26 and the lower intermediate shaft 21 are symmetrically distributed at 180 degrees on two sides of the central incomplete circular gear 24; the upper planet wheel shaft 29 and the lower planet wheel shaft 19 are symmetrically distributed at two sides of the central incomplete circular gear 24 at 180 degrees; an upper middle circular gear 31 and an upper middle eccentric gear 27 are hinged on the upper middle shaft 26, the upper middle circular gear 31 is fixedly connected with the upper middle eccentric gear 27, and an upper concave locking arc 32 is fixedly connected on the upper middle circular gear 31; a lower middle circular gear 35 and a lower middle eccentric gear 22 are hinged on the lower middle shaft 21, the lower middle circular gear 35 is fixedly connected with the lower middle eccentric gear 22, a lower concave locking arc 34 is fixedly connected on the lower middle circular gear 35, and the upper concave locking arc 32 and the lower concave locking arc 34 are matched with the convex locking arc 33; an upper planetary non-circular gear 28 is fixedly arranged on the upper planetary wheel shaft 29, and a lower planetary non-circular gear 20 is fixedly arranged on the lower planetary wheel shaft 19;
the central incomplete circular gear 24 is respectively meshed with an upper middle circular gear 31 and a lower middle circular gear 35, and the upper middle eccentric gear 27 and the lower middle eccentric gear 22 are meshed with an upper star non-circular gear 28 and a lower star non-circular gear 20;
the ends of the upper planetary wheel shaft 29 and the lower planetary wheel shaft 19 extending out of the gear box 25 are respectively fixed with an upper planting arm 30 and a lower planting arm 36;
the central incomplete circular gear 24 is an incomplete circular gear and has no teeth at the superposed part of the convex locking arc; the upper middle eccentric gear 27 and the lower middle eccentric gear 22 are eccentric gears with the same geometric parameters; the upper planetary non-circular gear 28 and the lower planetary non-circular gear 20 are non-circular gears having the same geometric parameters.
The upper star non-circular gear 28 and the lower star non-circular gear 20 are meshed with the upper middle eccentric gear 27 and the lower middle eccentric gear 22, so that the non-uniform transmission of the transplanting mechanism is realized; the upper and lower middle circular gears 31, 35 and the central incomplete circular gear 24 are in intermittent circular gear meshing transmission.
As shown in fig. 3-5, the upper planting arm 30 and the lower planting arm 36 have the same structure and both comprise a planting arm shell 11, a hollow loop bar 3 is arranged in the planting arm shell 11 in a sliding manner, a solid push rod 4 is arranged in the hollow loop bar 3 in a sliding manner, a loop bar spring 1 is arranged between the tail end of the hollow loop bar 3 and the planting arm shell 11, and a push rod energy-gathering spring 2 is arranged between the solid push rod 4 and the planting arm shell 11; the hollow loop bar 3 is provided with a first limit plate 16, a second limit plate 18 and an opening and closing mechanism; the solid push rod 4 is provided with a buckle groove, and the opening and closing mechanism is connected with the buckle groove 17 in an opening and closing manner; a double-contour cam 10, a shifting fork 5 and a trigger 8 are hinged in the planting arm shell 11, the shifting fork 5 and the trigger 8 are coaxial, as shown in fig. 5, one end of the shifting fork 5 is arranged between a first limiting plate 16 and a second limiting plate 18, the other end of the shifting fork 5 is abutted against the double-contour cam 10, the trigger 8 is in matched transmission with an opening and closing mechanism, and a trigger stretching spring 9 is arranged between the trigger 8 and the planting arm shell 11; the outer end part of the hollow loop bar 3 is provided with a seedling taking mechanism.
The transplanting arm shell of the first transplanting arm is coaxially and fixedly connected with the first planet wheel 19, namely the transplanting arm shell and the first planet wheel 19 have the same supporting shaft, and the transplanting arm shell and the first planet wheel 19 do not have relative displacement; the planting arm shell of the second planting arm is coaxially and fixedly connected with a second planet wheel 28, and the double-contour cam 10 is fixedly connected with the gear shell 25.
As shown in fig. 5, the opening and closing mechanism includes a Z-shaped buckle 6 and a Z-shaped buckle compression spring 7, the Z-shaped buckle 6 is hinged to the hollow loop bar 3, the Z-shaped buckle compression spring 7 is arranged between one end of the Z-shaped buckle 6 and the hollow loop bar 3, and the other end of the Z-shaped buckle 6 is buckled on the buckle slot 17.
As shown in fig. 6 and 8-10, the dual-profile cam 10 has two annular grooves, namely a first annular groove 101 and a second annular groove 102, the central angle range α of the first annular groove 101 is 75-85 degrees, the central angle range β of the second annular groove 102 is 345-350 degrees, and the included angle between the symmetry axes of the first annular groove 101 and the second annular groove 102 is 350 degrees
Is 100-250 degrees. Compared with the common cam, the double-profile cam 10 has the characteristics that only one power source is needed, a plurality of mutually independent works can be completed in the same rotation period, and mutual interference is avoided.
In the embodiment, two shifting forks 5 are adopted, a trigger 8 is clamped between the two shifting forks 5, the three shifting forks are hinged on the same rotating shaft, as shown in fig. 7, one end of each shifting fork 5 is erected between a first limiting plate 16 and a second limiting plate 18, one end of each shifting fork 5 is driven by a double-contour cam 10 to rotate around a hinged point of the corresponding shifting fork 5, and as one end of each shifting fork 5 is erected between the first limiting plate 16 and the second limiting plate 18 and between the tail end of the hollow sleeve rod 3 and the planting arm shell 11, sleeve rod springs 1 are arranged, so that one end of each shifting fork 5 always abuts against the first limiting plate 16; when the hollow loop bar 3 moves outwards, the second limit plate 18 limits the axial stroke of the hollow loop bar 3; the other end of shift fork 5 and the first annular groove 101 butt of double profile cam 10, the one end of trigger 8 and the second annular groove 102 butt of double profile cam 10, the other end of trigger 8 is detained 6 cooperation transmission with the Z shape for stir Z shape and detain 6, set up trigger extension spring 9 between the other end of trigger 8 and the arm casing 11 of planting.
The coaxial double-rod ejection mechanism is one of main mechanisms of the design, and the double rods always work on the same axis by the design that a hollow sleeve rod 3 is sleeved with a solid push rod 4. In the figure 5, a Z-shaped buckle 6 is hinged on a hollow loop bar 3, the Z-shaped buckle 6 can only rotate around the hinged position or can axially move along the axis of the hollow loop bar 3 along with the hollow loop bar 3, a buckle groove 17 is arranged in a solid push rod 4, the solid push rod 4 (shown in the figure 5) is buckled through the Z-shaped buckle 6, so that the double rods can move together, and the mechanism is matched with a double-contour cam 10 to finish two characteristic actions of seedling taking and ejection on the same axis.
As shown in fig. 4, the seedling taking mechanism comprises a seedling needle fixing frame 15 and seedling needles 12, the seedling needle fixing frame 15 is fixed at the outer end of the hollow sleeve rod 3, the seedling needles 12 are symmetrically hinged on the seedling needle fixing frame 15, and seedling needle clamping springs 13 are arranged between the seedling needles 12 and the seedling needle fixing frame 15. The outer end of the solid push rod 4 is fixedly connected with a trapezoidal guide block 14, and the trapezoidal guide block 14 is positioned between the two seedling needles 12. The seedling taking mechanism belongs to a tail end executing mechanism of the planting arm, wherein a trapezoidal guide block 14 is rigidly connected with the outer end of a solid push rod 4 and is matched with the inner side guide surface of a seedling needle 12 to realize the opening and closing of the seedling needle while moving along the axial direction of the solid push rod 4. Compared with the seedling needle of the existing rice transplanter, the seedling needle clamping spring 13 is adopted to provide clamping force, so that the seedling needle is not damaged and the seedling is not easily damaged when the seedling needle clamps a hard object.
The working principle of the invention is as follows:
when the gear box 25 rotates counterclockwise one turn around the central shaft 23 (i.e., the transplanting arm driving shaft) as shown in fig. 1 and 2, the above partial transmission is explained as an example: the upper planetary wheel shaft 29 rotates for 1 circle in the opposite direction (namely clockwise direction) relative to the gear box 25, when the speed ratio (transmission gear ratio) of the upper planetary non-circular gear 28 and the upper intermediate eccentric gear 27 is near the maximum value, the upper transplanting arm 30 is in the maximum swing angle state, so that the seedling needles 12 enter the pot seedling tray 43 to clamp seedlings, and a seedling taking track A2 is formed; when the gear box 25 is from the maximum position to the minimum position of the speed ratio, a seedling taking claw track A3 for clamping seedlings is formed, in the process that the upper transplanting arm 30 enters the pot seedling tray 43 from the lowest point position, the convex locking arc 33 is matched with the concave locking arc 32, the upper planetary wheel shaft 29 does not rotate relative to the gear box 25, the upper transplanting arm 30 rotates around the central shaft 23 along with the gear box 25, and a return track A1 for enabling the upper transplanting arm 30 to ascend to the pot seedling tray by taking the central shaft 23 as the center is formed.
The seedling taking action is realized through a seedling taking mechanism, as shown in figure 3, the hollow loop bar 3 is rigidly connected with the whole seedling needle 12 fixing frame to realize the simultaneous movement of the two;
as shown in fig. 11, the hollow loop bar 3 is controlled by a double-profile cam 10, a shifting fork 5 and a spring (including a Z-shaped buckle compression spring 7 and a buckle trigger extension spring 9), and the whole movement process comprises 5 movement processes of near rest, push stroke, return stroke, far rest and ejection, and is detailed as follows:
(1) on close rest: the seedling needle 12 is in the initial state, the absolute movement and the traction movement of the seedling needle 12 in the section are completely the same, at the moment, the solid push rod 4 and the trapezoidal guide block 14 are in the ejection state, the other end of the Z-shaped buckle 6 is not buckled on the buckle groove 17, and the second limit plate 18 is propped against the planting arm shell 11, so that the hollow loop bar 3 does not move axially.
(2) Pushing: the seedling taking process of the seedling needle 12 is realized, the other end of the shifting fork 5 slides into a first annular groove 101 of the double-contour cam 10, the hollow sleeve rod 3, the seedling needle fixing frame 15 and the seedling needle 12 axially extend outwards through the first annular groove 101 on the double-contour cam 10, at the moment, the solid push rod 4 and the trapezoidal guide block 14 are still static, the seedling needle 12 moves forwards relative to the trapezoidal guide block 14, the inner side of the seedling needle 12 is in contact with the trapezoidal guide block 14, the seedling needle 12 clamps a bowl body under the combined action of the pressure of the seedling needle clamping spring 13 and the trapezoidal guide block 14, and the other end of the Z-shaped buckle 6 is buckled on the buckle groove 17.
(3) And (3) return stroke: after the other end of the shifting fork 5 finishes sliding in the first annular groove 101 of the double-profile cam 10, the double-profile cam 10 continues rotating, the other end of the shifting fork 5 starts to slide out of the first annular groove 101, so that the shifting fork 5 pushes the first limiting plate 16 to compress the loop bar spring 1, the Z-shaped buckle 6 is buckled on the buckle groove 17 of the solid push rod 4 and moves together along with the hollow loop bar 3 to the direction of compression of the loop bar spring 1 in the process, and meanwhile, the bowl body moves together along with the hollow loop bar 3.
(4) Remote rest: the whole body is in the state shown in figure 3, the bowl body is clamped on the seedling needle 12, and the loop bar spring 1 and the push rod energy-gathering spring 2 are in a compressed state; during the period, the distance from the sharp point of the seedling needle 12 to the rotation center of the planet wheel of the planetary gear train of the seedling throwing mechanism is kept unchanged.
(5) Ejection: the motion of the one end of the trigger 8 is controlled by the second annular groove 102 of the double-contour cam 10, when the one end of the trigger 8 slides out of the second annular groove 102, the other end of the trigger 8 stirs one end of the Z-shaped button 6, the Z-shaped button 6 utilizes the lever principle, so that the other end of the Z-shaped button 6 is disconnected with the catching groove 17, the compressed push rod energy-gathering spring 2 releases elastic potential energy, the solid push rod drives the guide block 14 to move rapidly, and the pot body clamped by the seedling needle 12 is ejected rapidly and is shot into the ground. Then the state is maintained to prepare for next seedling taking.
Claims (9)
1. A coaxial double-rod ejection type eccentric gear-non-circular gear planetary system seedling throwing mechanism comprises a gear box; the inner support of the gear box is provided with a central incomplete circular gear, an upper middle circular gear, a lower middle circular gear, an upper middle eccentric gear, a lower middle eccentric gear, an upper planet non-circular gear and a lower planet non-circular gear, wherein the upper middle circular gear, the lower middle circular gear, the upper planet non-circular gear and the lower planet non-circular gear are symmetrically distributed on two sides of the central incomplete circular gear at 180 degrees; the upper middle eccentric gear is coaxially and fixedly connected with the upper middle circular gear, and the lower middle eccentric gear is coaxially and fixedly connected with the lower middle circular gear;
the central incomplete circular gear is fixedly connected with a convex locking arc, the upper middle circular gear is fixedly connected with an upper concave locking arc, the lower middle circular gear is fixedly connected with a lower concave locking arc, and the upper concave locking arc and the lower concave locking arc are matched with the convex locking arc;
the central incomplete circular gear is respectively meshed with an upper middle circular gear and a lower middle circular gear, and the upper middle eccentric gear and the lower middle eccentric gear are meshed with an upper star non-circular gear and a lower star non-circular gear;
the transplanting machine also comprises an upper transplanting arm and a lower transplanting arm; the upper star noncircular gear and the lower star noncircular gear are coaxially connected with the upper transplanting arm and the lower transplanting arm;
the planting arm mechanism is characterized in that the upper and lower planting arm components have the same structure and respectively comprise a planting arm shell, a hollow loop bar is arranged in the planting arm shell in a sliding manner, a solid push rod is arranged in the hollow loop bar in a sliding manner, a loop bar spring is arranged between the tail end of the hollow loop bar and the planting arm shell, and a push rod energy-gathering spring is arranged between the solid push rod and the planting arm shell; the hollow loop bar is provided with a first limiting plate, a second limiting plate and an opening and closing mechanism; the solid push rod is provided with a buckle groove, and the opening and closing mechanism is in opening and closing connection with the buckle groove; the planting arm comprises a planting arm shell, a shifting fork, a trigger and a trigger pulling mechanism, wherein a double-contour cam, the shifting fork and the trigger pulling mechanism are hinged in the planting arm shell, the shifting fork and the trigger pulling mechanism are coaxial, one end of the shifting fork is erected between a first limiting plate and a second limiting plate, the other end of the shifting fork and one end of the trigger pulling mechanism are both abutted against the double-contour cam, the other end of the trigger pulling mechanism is in matched transmission with an opening and closing mechanism, and a trigger pulling spring is arranged between the other end; the outer end part of the hollow loop bar is provided with a seedling taking mechanism;
the planting arm shell is coaxially and fixedly connected with the upper middle eccentric gear and the lower middle eccentric gear, and the double-contour cam is fixedly connected with the gear box.
2. The coaxial dual-lever ejection-type eccentric gear-non-circular gear planetary system seedling throwing mechanism according to claim 1, wherein: the central incomplete circular gear is a gear which is not arranged at the overlapping part of the incomplete circular gear and the convex locking arc; the upper middle eccentric gear and the lower middle eccentric gear are eccentric gears with the same geometric parameters; the upper planet non-circular gear and the lower planet non-circular gear are non-circular gears with the same geometric parameters.
3. The coaxial dual-lever ejection-type eccentric gear-non-circular gear planetary system seedling throwing mechanism according to claim 1, wherein: the upper star non-circular gear and the lower star non-circular gear are meshed with the upper middle eccentric gear and the lower middle eccentric gear, so that the non-uniform transmission of the transplanting mechanism is realized; the upper and lower middle circular gears and the central incomplete circular gear are in intermittent circular gear meshing transmission.
4. The coaxial dual-lever ejection eccentric gear-non-circular gear planetary system seedling throwing mechanism according to claim 1, wherein the opening and closing mechanism comprises a Z-shaped buckle and a Z-shaped buckle compression spring, the Z-shaped buckle is hinged on the hollow sleeve rod, the Z-shaped buckle compression spring is arranged between one end of the Z-shaped buckle and the hollow sleeve rod, and the other end of the Z-shaped buckle is in open and close connection with the buckle groove.
5. The coaxial dual lever ejection eccentric gear-non-circular gear planetary system seedling throwing mechanism of claim 4, wherein said dual contoured cam has a first annular groove and a second annular groove thereon.
6. The coaxial dual-lever ejection eccentric gear-non-circular gear planetary system seedling throwing mechanism as claimed in claim 5, wherein the central angle range α of the first annular groove is 75-85 degrees, the central angle range β of the second annular groove is 345-350 degrees, and the included angle phi between the symmetry axes of the first annular groove and the second annular groove is 100-250 degrees.
7. The coaxial dual-lever ejection-type eccentric gear-non-circular gear planetary system seedling throwing mechanism according to claim 5 or 6, wherein one end of the shift fork is mounted between a first limiting plate and a second limiting plate; the other end of shift fork and the first annular groove butt of two profile cam, the one end of trigger and the second annular groove butt of two profile cam, the other end of trigger and plant and set up trigger extension spring between the arm casing, the other end and the Z shape of trigger are detained the cooperation transmission.
8. The coaxial dual-rod ejection type eccentric gear-non-circular gear planetary system seedling throwing mechanism as claimed in claim 7, wherein the seedling taking mechanism comprises seedling needles symmetrically hinged on the outer ends of the hollow sleeve rods, and seedling needle clamping springs are arranged between the seedling needles and the hollow sleeve rods.
9. The coaxial dual-lever ejection-type eccentric gear-non-circular gear planetary system seedling throwing mechanism of claim 8, wherein a trapezoidal guide block is fixedly connected to the outer end of the solid push rod, and the trapezoidal guide block is positioned between two seedling needles.
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| CN201550426U (en) * | 2009-11-12 | 2010-08-18 | 李荣宇 | Pot seedling rice transplanting machine planting arm |
| KR20150133023A (en) * | 2014-05-19 | 2015-11-27 | 대동공업주식회사 | Saddle type rice transplanter |
| CN204721844U (en) * | 2015-03-10 | 2015-10-28 | 浙江理工大学 | A kind of non-circular gear double-planet train pot seedling transplanter structure |
| CN104855023B (en) * | 2015-05-20 | 2017-01-18 | 浙江理工大学 | Sinusoidal motion swing type wide-narrow row spacing transplanting mechanism for pot seedlings |
| CN206314192U (en) * | 2016-11-26 | 2017-07-11 | 浙江农林大学 | A kind of coaxial double-rod ejection type eccentric gear noncircular planetary gear system rice seedling throwing mechanism |
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| 非圆齿轮水稻钵苗抛秧机构运动机理与参数优化;钱孟波;《农业机械学报》;20141231;第45卷(第6期);65 * |
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