Garlic seeder
阅读说明：本技术 一种大蒜播种机 (Garlic seeder ) 是由 张春岭 谢东波 陈黎卿 王韦韦 吴晓庆 于 2019-10-31 设计创作，主要内容包括：本发明公开了一种大蒜播种机,包括机架、前罩壳、平衡轮、驱动轮、电机、排种变速器、开沟排种装置、压辊和扶手架,前罩壳位于机架前端上方与机架焊接,机架前端设有驱动轮支撑架,平衡轮同轴设有大带轮,平衡轮两端与机架和驱动轮支撑架转动连接,驱动轮与驱动轮支撑架下端转动连接,电机与前罩壳紧固连接,排种变速器与前罩壳紧固连接,机架中部设有横撑杆一和横撑杆二,开沟排种装置与横撑杆一和横撑杆二紧固连接,压辊与机架转动连接,扶手架与机架后端焊接,实现了大蒜种子底端朝下的精准落种,避免了由于单缸汽油机驱动带来的振动和由于轮子支撑其在田地间行走倾斜造成的落种倾斜,保证了大蒜种子的发芽率,从而保证了产量。(The invention discloses a garlic seeder, which comprises a frame, a front cover shell, a balance wheel, a driving wheel, a motor, a seed sowing transmission, a ditching seed sowing device, a press roller and a handrail frame, wherein the front cover shell is positioned above the front end of the frame and welded with the frame, the front end of the frame is provided with a driving wheel support frame, the balance wheel is coaxially provided with a large belt wheel, two ends of the balance wheel are rotatably connected with the frame and the driving wheel support frame, the driving wheel is rotatably connected with the lower end of the driving wheel support frame, the motor is fixedly connected with the front cover shell, the seed sowing transmission is fixedly connected with the front cover shell, the middle part of the frame is provided with a first transverse brace and a second transverse brace, the ditching seed sowing device is fixedly connected with the first transverse brace and the second transverse brace, the press roller is rotatably connected with the frame, the handrail frame is welded with the rear end of the frame, the accurate seed sowing of garlic seeds with the bottom end, the germination rate of garlic seeds is ensured, thereby ensuring the yield.)
1. A garlic seeder which is characterized in that: comprises a frame (1), a front cover shell (2), a balance wheel (3), a driving wheel (4), a motor (5), a seed sowing transmission (6), a ditching seed sowing device (7), a press roller (8) and a handrail frame (9), wherein the front cover shell (2) is positioned above the front end of the frame (1) and welded with the frame (1), a driving wheel support frame (10) is welded on the outer wall of the front end of the frame (1), the balance wheel (3) is coaxially provided with a large belt wheel (30), two ends of the balance wheel (3) are rotationally connected with the frame (1) and the driving wheel support frame (10), two ends of the balance wheel (3) are provided with a first chain wheel (31), the first chain wheel (31) is positioned in the driving wheel support frame (10), the driving wheel (4) is rotationally connected with the lower end of the driving wheel support frame (10), a second chain wheel (40) is arranged on a main shaft of the driving wheel (4), and the first chain wheel (31, the ditching and seed discharging device is characterized in that the motor (5) is fixedly connected with the front housing (2), a small belt wheel (50) is arranged on an output shaft of the motor (5), the small belt wheel (50) is connected with the large belt wheel (30) through a belt, a first gear (51) is fixedly connected with the small belt wheel (50) through a flange, the seed discharging speed changer (6) is fixedly connected with the front housing (2), a second gear (60) is arranged on an input shaft of the seed discharging speed changer (6), the first gear (51) is meshed with the second gear (60), a third sprocket (61) is arranged on an input output shaft of the seed discharging speed changer (6), a first transverse supporting rod (11) and a second transverse supporting rod (12) are arranged in the middle of the rack (1), the ditching and seed discharging device (7) is fixedly connected with the first transverse supporting rod (11) and the second transverse supporting rod (12), the press roll (8) is positioned behind the rack (1) and is, the armrest frame (9) is welded with the rear end of the frame (1).
2. The garlic seeder of claim 1, wherein: the driving wheel supporting frame (10) is symmetrically provided with hollow rectangular grooves I (10-1).
3. The garlic seeder of claim 1, wherein: the transverse supporting rod II (12) is provided with a plurality of rectangular grooves II (12-1) at equal intervals, the upper end face of the transverse supporting rod II (12) is adhered with a rubber pad (12-2), and a straight opening (12-3) is formed in the rubber pad (12-2) corresponding to the middle of the rectangular groove II (12-1).
4. The garlic seeder of claim 1, wherein: the middle part of the rear end of the rack (1) is rotatably provided with a steering rod (13), and the lower end of the steering rod (13) is provided with a steering wheel (13-1).
5. The garlic seeder of claim 1, wherein: a plurality of angle buttons (32) are uniformly arranged on the outer wall of the balance wheel (3).
6. The garlic seeder according to claim 1 or 3, wherein: the ditching and seed-metering device (7) consists of a seed box (70), a seed dropping cylinder (71), an upper cover (72), a rectangular guide sleeve (73), an electric push rod (74), a cross beam (75), a ditcher (76), a first rotating shaft (77), a second rotating shaft (78), a third rotating shaft (79) and a seed metering chain (700), wherein the seed box (70) is fixedly connected with the upper end of the second transverse supporting rod (12), a plurality of seed dropping cylinders (71) are uniformly arranged along the width direction of the first transverse supporting rod (11), the seed dropping cylinder (71) is fixedly connected with the first transverse supporting rod (11), the upper cover (72) is fixedly connected with the upper end of the seed dropping cylinder (71), the rectangular guide sleeve (73) is welded with the front side of the lower end of the seed dropping cylinder (71), the electric push rod (74) is fixedly connected with the front side of the seed dropping cylinder (71) at the middle position, and the middle part of the cross beam (75) is fixedly connected with the end part of the push rod (74), the furrow opener (76) is connected with the rectangular guide sleeve (73) in a sliding mode, the top end of the furrow opener (76) is fixedly connected with the cross beam (75), and the first rotating shaft (77) penetrates through the upper covers (72) and is connected with the upper covers (72) in a rotating mode; the end part of the first rotating shaft (77) is provided with a chain wheel four (77-1), the chain wheel three (61) is connected with the chain wheel four (77-1) through a chain, a seed sowing chain wheel one (77-2) is arranged on the first rotating shaft (77) and positioned in the upper cover (72), two ends of the second rotating shaft (78) are rotatably connected with the rack (1), a seed sowing chain wheel two (78-1) is arranged on the second rotating shaft (78) and positioned in the lower end of the seed dropping cylinder (71), two ends of the third rotating shaft (79) are rotatably connected with the rack (1), a seed sowing chain wheel three (79-1) is arranged on the third rotating shaft (79) and positioned at the lower end of the straight opening (12-3), the seed sowing chain (700) spans across the seed sowing chain wheel I (77-1), the seed sowing chain wheel II (78-1) and the seed sowing chain wheel III (79-1), the seed sowing chain (700) is evenly provided with a plurality of seed taking spoons (700-1) at equal intervals.
7. The garlic seeder of claim 6, wherein: the upper end of the seed falling cylinder (71) is thick in rectangular section, the lower end of the seed falling cylinder is thin in rectangular section, and the middle parts of the seed falling cylinder are connected excessively through a hollow quadrangular frustum.
8. The garlic seeder according to claim 1 or 3, wherein: the middle of the armrest frame (9) is provided with a control box (90), and the two sides of the armrest frame (9) are symmetrically provided with armrests (91).
9. The garlic seeder of claim 6, wherein: the front cover (2) is fixedly provided with a storage battery (20), the storage battery (20) is electrically connected with the motor (5) and the electric push rod (74) through leads, and the first gear (51) and the second gear (60) are provided with a cover (21).
Technical Field
The invention belongs to the technical field of agricultural machinery, and particularly relates to a garlic seeder.
Background
Traditional garlic is planted, relies on the peasant to insert the bottom of garlic seed one in soil down, then covers soil and live bottom parcel, and traditional planting mode only is fit for small area and plants, plants to the large tracts of land, and efficiency is too low, and intensity of labour is too big.
In recent years, the research on the garlic seeder in China is continuously and deeply carried out, and the garlic seeder is rapidly developed.
When the garlic seeds fall into the soil, the garlic seeds can be ensured to germinate by contacting with the low-layer moist soil with the bottom end facing downwards. Present garlic seeder passes through its operation of single cylinder gasoline engine drive, can realize the seeding, but the seed that can't guarantee to fall by the vibration of single cylinder gasoline engine must be the bottom down, causes the seed germination rate low, has seriously influenced the seeding quality of seeder, directly leads to the decline of soil output.
In addition, present garlic seeder adopts the wheel to support and walks between the field, meets soil slope or pit in the field for the garlic seeder slope, the garlic seed when also directly leading to falling soil is not the bottom down, causes the seed germination rate low, has seriously influenced the seeding quality of seeder, directly leads to the decline of soil output.
Disclosure of Invention
The garlic seeder provided by the invention realizes accurate seed dropping of garlic seeds with the bottom ends facing downwards, avoids seed dropping inclination caused by vibration driven by a single-cylinder gasoline engine and walking inclination of the garlic seeds among fields supported by wheels, and ensures the germination rate of the garlic seeds, thereby ensuring the yield.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a garlic seeder, includes frame, preceding housing, stabilizer wheel, drive wheel, motor, seed metering derailleur, ditching seed metering device, compression roller and handrail frame, preceding housing is located frame front end top, and welds with the frame, has the drive wheel support frame on the frame front end outer wall, the stabilizer wheel is coaxial to be equipped with big band pulley, the stabilizer wheel both ends are connected with frame and drive wheel support frame rotation, and the stabilizer wheel both ends are equipped with sprocket one, and sprocket one is located the drive wheel support frame, the drive wheel rotates with drive wheel support frame lower extreme and is connected, and is equipped with sprocket two on the main shaft of drive wheel, is connected through the chain between sprocket one and the sprocket two, motor and preceding housing fastening connection, be equipped with the small belt wheel on the motor output shaft, and be connected through the belt between small belt wheel and the big band pulley, be connected with gear one through flange fastening connection with the small, the seed metering speed changer is fixedly connected with the front cover shell, a gear II is arranged on an input shaft of the seed metering speed changer and is meshed with the gear II, a chain wheel III is arranged on an input output shaft of the seed metering speed changer, a transverse supporting rod I and a transverse supporting rod II are arranged in the middle of the rack, the ditching and seed metering device is fixedly connected with the transverse supporting rod I and the transverse supporting rod II, the press roller is located behind the rack and is rotatably connected with the rack, and the armrest frame is welded with the rear end of the rack.
Preferably, the driving wheel support frame is symmetrically provided with a first hollow rectangular groove.
Preferably, a plurality of rectangular grooves II are arranged on the transverse supporting rod II at equal intervals, a rubber pad is pasted on the upper end face of the transverse supporting rod II, and a straight opening is arranged on the rubber pad corresponding to the middle position of the rectangular grooves II.
Preferably, the middle part of the rear end of the rack is rotatably provided with a steering rod, and the lower end of the steering rod is provided with a steering wheel.
Preferably, a plurality of angle buttons are uniformly arranged on the outer wall of the balance wheel.
Preferably, the ditching and seed discharging device comprises a seed box, a seed dropping cylinder, an upper cover, a rectangular guide sleeve, an electric push rod, a cross beam, a ditcher, a first rotating shaft, a second rotating shaft, a third rotating shaft and a seed discharging chain, wherein the seed box is tightly connected with the upper ends of the two transverse supporting rods; a rotating shaft end part is provided with a chain wheel four, the chain wheel three and the chain wheel four-way are connected through a chain, a first seed discharging chain wheel is arranged inside an upper cover on the rotating shaft, two ends of the rotating shaft are connected with the frame in a rotating mode, a second seed discharging chain wheel is arranged inside a lower end of a seed falling cylinder on the rotating shaft two, two ends of the rotating shaft are connected with the frame in a rotating mode, a third seed discharging chain wheel is arranged at a lower end of a straight line port on the rotating shaft three, the seed discharging chain spans the first seed discharging chain wheel, the second seed discharging chain wheel and the third seed discharging chain wheel, and a plurality of seed taking spoons are evenly arranged on.
Preferably, the rectangular cross section of the upper end of the seed falling cylinder is thick, the rectangular cross section of the lower end of the seed falling cylinder is thin, and the middle parts of the seed falling cylinders are excessively connected through a hollow quadrangular frustum.
Preferably, the middle of the armrest frame is provided with the control box, and the two sides of the armrest frame are symmetrically provided with the armrests.
Preferably, a storage battery is fixedly arranged on the front cover casing, the storage battery is electrically connected with the motor and the electric push rod through a lead, and the cover casing is arranged on the first gear and the second gear.
The beneficial effect of adopting above technical scheme is:
1. this garlic seeder will peel off the garlic seed of separating earlier and pack into kind of case, because the hollow quadrangular frustum pyramid structure of case for handstand for the garlic seed all concentrates on near a word mouth, then through the control box starter motor in the middle of the handrail frame, the output shaft of motor drives little band pulley and gear simultaneously and rotates, and the power of following the motor output is little band pulley of the same way and is rotated through the big band pulley of belt drive, and big band pulley takes the sprocket at stabilizer and stabilizer both ends to rotate, and sprocket one passes through two rotations of chain drive sprocket, and the drive wheel of two simultaneous drive both sides of sprocket rotates, frame rear end middle part is rotated and is equipped with the steering column, and the steering column lower extreme is equipped with the directive wheel, has realized the travelling of garlic seeder on the road.
When the garlic seeding is needed to be carried out, the garlic seeding machine runs to a reclaimed field, so that the two driving wheels are positioned in the ditches for draining water on two sides of the seeding area, the balance wheels are in contact with the seeding area, the two driving wheels are in a suspended state, and then the supporting height of the steering wheels is adjusted through the steering rods, so that the compression rollers are also in contact with the seeding area.
Then the push rod of the electric push rod is controlled to extend or contract through the control box, the cross beam drives the furrow openers to be lowered or lifted in the rectangular guide sleeves, and the adjustment of the soil penetration depth of the furrow openers is realized.
The other path of the power output by the motor is that the gear I drives the gear II to rotate, the gear II drives a chain wheel III on an output shaft of the seed sowing transmission to rotate through the seed sowing transmission, the chain wheel III drives the chain wheel IV to rotate through a chain, the chain wheel IV drives a rotating shaft I to rotate in the upper cover, the rotating shaft I drives a seed sowing chain to rotate around a seed sowing chain wheel II on the rotating shaft II and a seed sowing chain wheel III on the rotating shaft III through the seed sowing chain wheel I, then the seed taking spoon is stretched from bottom to top along with the seed discharging chain to pass through the straight opening on the rubber pad to take the garlic seeds in the seed box away, the garlic seeds contained in the seed taking spoon move into the upper cover along with the seed discharging chain, then falls down from the seed falling cylinder and falls into the garlic planting groove opened by the furrow opener, the emptied seed taking spoon continues to move along with the seed discharging chain to prepare for taking garlic seeds out of the seed box next time, and the garlic planter realizes sowing in the garlic planting groove opened by the furrow opener when moving between fields.
2. This garlic seeder, the straight mouth that goes up to pass on the rubber pad is followed down along with the seed metering chain to the spoon of getting, takes away the garlic seed in the kind of case, and the garlic seed of being got kind of spoon splendid attire moves to the upper shield along with the seed metering chain in, then falls down from a kind of a section of thick bamboo that falls, because a kind of section of thick bamboo upper end rectangular cross section that falls is thick, and lower extreme rectangular cross section is thin, and the middle part excessively connects through hollow four arris platform, and at the garlic seed from last down the in-process that drops, through the excessive region of hollow four arris platforms that the middle part stands upside down for the bottom of garlic seed is down, has realized the accurate kind of falling of garlic seed bottom down, has guaranteed the bottom of garlic seed and the area of contact of low level moist soil, guarantees the germination rate of garlic seed, has improved.
3. The garlic seeder runs into a reclaimed field, the two driving wheels are positioned in ditches for draining water at two sides of a seeding area, the balance wheel is in contact with the seeding area, the two driving wheels are in a suspended state, then the supporting height of the steering wheel is adjusted through the steering rod, the compression roller is also in contact with the seeding area, the garlic seeder runs between fields by virtue of the balance wheel, the balance wheel and the compression roller have certain width, the horizontality of the garlic seeder during running between fields is ensured, the falling and falling inclination of seeds in the seed taking spoon caused by the inclination of the wheels during running between fields are avoided, the germination rate of the garlic seeds is ensured, and the yield is ensured; in addition, the traditional single-cylinder gasoline engine is driven by a motor instead of a traditional single-cylinder gasoline engine, so that the running is smoother, the vibration caused by the driving of the single-cylinder gasoline engine is avoided, the germination rate of garlic seeds is ensured, and the yield is ensured.
4. The driving wheel supporting frame is symmetrically provided with hollow rectangular grooves I, so that the mounting of a chain wheel I and a chain wheel II and a chain for connecting the chain wheel I and the chain wheel II is facilitated; a plurality of rectangular grooves II are arranged on the transverse supporting rods II at equal intervals, rubber pads are adhered to the upper end faces of the transverse supporting rods II, and straight openings are arranged in the rubber pads corresponding to the middle parts of the rectangular grooves II, so that garlic seeds are prevented from falling off when stored in the seed box, and the seed taking spoon is not influenced to take the garlic seeds from the seed box; the middle part of the rear end of the rack is rotatably provided with a steering rod, and the lower end of the steering rod is provided with a steering wheel, so that the steering of the steering wheel and the adjustment of the supporting height are realized, the contact between a press roller and soil in a sowing area is ensured, and the compaction operation of the soil is realized; the outer wall of the balance wheel is uniformly provided with a plurality of angle buckles, so that the phenomenon of slipping when the driving wheel contacts with soil in a sowing area when the balance wheel is used for sowing operation is avoided, the garlic sowing machine advances and the ditching and seed discharging device coordinately work, and the phenomenon of repeated sowing caused by in-situ slipping of the balance wheel is avoided.
Drawings
FIG. 1 is a first assembly view of the garlic seeder;
FIG. 2 is a second assembly view of the garlic seeder;
FIG. 3 is a schematic view of the mounting structure of the front cover, balance wheel, advancing wheel, motor and seed-metering transmission;
FIG. 4 is a schematic structural view of a second cross brace;
FIG. 5 is an assembly view of the ditching and seed discharging device;
FIG. 6 is a side view of the mounting of a seed feed sprocket I, a seed feed sprocket II, a seed feed sprocket III and a seed feed chain;
FIG. 7 is a first schematic view of a seed dropping barrel;
FIG. 8 is a schematic view of a seed dropping barrel structure II;
FIG. 9 is a schematic view of the furrow opener configuration;
wherein:
1. a frame; 2. a front cover shell; 3. a balance wheel; 4. a drive wheel; 5. a motor; 6. a seed sowing transmission; 7. a ditching and seed discharging device; 8. a compression roller; 9. a handrail frame;
10. an advancing wheel support frame; 10-1, a first rectangular groove; 11. a first transverse supporting rod; 12. a transverse supporting rod II; 12-1, a rectangular groove II; 12-2, rubber pads; 12-3, a straight line; 13. a steering lever; 13-1, a steering wheel;
20. a storage battery; 21. a housing;
30. a large belt pulley; 31. a chain wheel I; 32. corner buckles;
40. a second chain wheel;
50. a small belt pulley; 51. a first gear;
60. a second gear; 61. a third chain wheel;
70. a seed box; 71. a seed falling cylinder; 72. an upper cover; 73. a rectangular guide sleeve; 74. an electric push rod; 75. a cross beam; 76. a furrow opener; 77. a first rotating shaft; 77-1 and a chain wheel IV; 77-2, a first seed sowing chain wheel; 78. a second rotating shaft; 78-1 and a seed sowing chain wheel II; 79. a rotating shaft III; 79-1 and a seed sowing chain wheel III; 700. a seed sowing chain; 700-1, taking a seed spoon;
90. a control box; 91. a handrail.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to facilitate its implementation.
As shown in fig. 1 to 9, the present invention is a garlic seeder, which realizes accurate seed dropping with the bottom end of garlic seeds facing downward, avoids the seed dropping inclination caused by the vibration driven by a single cylinder gasoline engine and the inclination of the wheels supporting the garlic seeds to travel between fields, and ensures the germination rate of the garlic seeds, thereby ensuring the yield.
Specifically, as shown in fig. 1 to 9, the seeding machine comprises a frame 1, a front cover 2, a balance wheel 3, a driving wheel 4, a motor 5, a seeding transmission 6, a ditching seeding device 7, a pressing roller 8 and a handrail frame 9, wherein the front cover 2 is positioned above the front end of the frame 1 and welded with the frame 1, a driving wheel support frame 10 is welded on the outer wall of the front end of the frame 1, the balance wheel 3 is coaxially provided with a large belt wheel 30, two ends of the balance wheel 3 are rotatably connected with the frame 1 and the driving wheel support frame 10, two ends of the balance wheel 3 are provided with a first chain wheel 31, the first chain wheel 31 is positioned in the driving wheel support frame 10, the driving wheel 4 is rotatably connected with the lower end of the driving wheel support frame 10, a second chain wheel 40 is arranged on a main shaft of the driving wheel 4, the first chain wheel 31 and the second chain wheel 40 are connected through a chain, the motor, the small belt wheel 50 is connected with the large belt wheel 30 through a belt, the small belt wheel 50 is fixedly connected with a first gear 51 through a flange, the seed sowing transmission 6 is fixedly connected with the front housing 2, a second gear 60 is arranged on an input shaft of the seed sowing transmission 6, the first gear 51 is meshed with the second gear 60, a third chain wheel 61 is arranged on an input shaft of the seed sowing transmission 6, a first transverse supporting rod 11 and a second transverse supporting rod 12 are arranged in the middle of the rack 1, the ditching and seed sowing device 7 is fixedly connected with the first transverse supporting rod 11 and the second transverse supporting rod 12, the press roller 8 is positioned behind the rack 1 and is rotatably connected with the rack 1, and the handrail frame 9 is welded with the rear end of the rack 1.
As shown in fig. 1 and 2, a hollow rectangular groove i 10-1 is symmetrically arranged on the driving
As shown in fig. 1, 2 and 4, a plurality of rectangular grooves two 12-1 are arranged on the two transverse supporting
As shown in FIG. 1, a steering
As shown in fig. 2 and 3, a plurality of corner buckles 32 are uniformly arranged on the outer wall of the
As shown in fig. 1, 2 and 5, the ditching and seed-feeding device 7 comprises a seed box 70, a seed dropping cylinder 71, an upper cover 72, a rectangular guide sleeve 73, an electric push rod 74, a cross beam 75, a ditcher 76, a first rotating shaft 77, a second rotating shaft 78, a third rotating shaft 79 and a seed feeding chain 700, wherein the seed box 70 is fixedly connected with the upper ends of the second cross support rods 12, a plurality of seed dropping cylinders 71 are uniformly arranged along the width direction of the first cross support rods 11, the seed dropping cylinder 71 is fixedly connected with the first cross support rods 11, the upper cover 72 is fixedly connected with the upper ends of the seed dropping cylinders 71, the rectangular guide sleeve 73 is welded with the front sides of the lower ends of the seed dropping cylinders 71, the electric push rod 74 is fixedly connected with the front sides of the seed dropping cylinders 71 at the middle positions, the middle parts of the cross beams 75 are fixedly connected with the push rod end parts of the electric push rod 74, the ditcher 76 is slidably connected with the rectangular guide sleeve 73 as shown in fig. 9, the first rotating shaft 77 penetrates through the upper covers 72 and is rotatably connected with the upper covers 72; the end part of the first rotating shaft 77 is provided with a chain wheel IV 77-1, the chain wheel III 61 is connected with the chain wheel IV 77-1 through a chain, a seed sowing chain wheel IV 77-2 is arranged on the first rotating shaft 77 and positioned in the upper cover 72, two ends of the second rotating shaft 78 are rotatably connected with the rack 1, a seed sowing chain wheel II 78-1 is arranged on the second rotating shaft 78 and positioned in the lower end of the seed falling cylinder 71, two ends of the third rotating shaft 79 are rotatably connected with the rack 1, a seed sowing chain wheel III 79-1 is arranged on the third rotating shaft 79 and positioned at the lower end of the I-shaped opening 12-3, a seed sowing chain 700 shown in figure 6 spans over the seed sowing chain wheel IV 77-2, the seed sowing chain wheel II 78-1 and the seed sowing chain wheel III 79-1, and a plurality of seed taking spoons 700.
As shown in fig. 7 and 8, the
As shown in fig. 1 and 2, a
As shown in fig. 2 and 3, the
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