CN114946339B - Precision seed taking device capable of quickly replacing seed taking plate - Google Patents

Abstract

The invention discloses a precise seed taking device capable of quickly replacing a seed taking disc, which comprises a rack, wherein an air chamber is arranged on the rack, an open end at the front end of the air chamber is closed through the seed taking disc, a transmission shaft is rotatably arranged at the center of the air chamber, and the seed taking disc is arranged on the transmission shaft through a seed disc replacing mechanism; the mechanism is changed to kind of dish includes interior regulation section of thick bamboo, the squeeze chip, an outer regulation section of thick bamboo, adjusting part, interior regulation section of thick bamboo, an outer regulation section of thick bamboo suit is on the transmission shaft from inside to outside in proper order, interior regulation section of thick bamboo front end is equipped with first limit flange, an outer regulation section of thick bamboo front end is equipped with second limit flange, the squeeze chip with get kind of a dish detachably suit including on the regulation section of thick bamboo, first limit flange, the squeeze chip, get kind of a dish and second limit flange and arrange in proper order backward from the past, adjust two regulation sections of thick bamboos through adjusting part and follow axial reverse movement, thereby two real limit flanges are close to each other or keep away from each other, and then realize getting the tight or loosen of clamp of kind of dish. The invention has the advantages that: the seed taking working part is convenient and quick to replace.

Description

A precision seed-taking device that can quickly replace the seed-taking tray

technical field

The invention relates to the field of agricultural machinery, in particular to a precision seed-picking device capable of rapidly replacing a seed-picking tray.

Background technique

The air suction seeder is a seeder that uses negative pressure to pick seeds to achieve the purpose of precision sowing. Compared with the traditional mechanical seeder, it has stronger advantages in performance and technical content. The seed picking device is the core component of the air suction seeder, and its performance directly affects the working quality of the seeder. Compared with the mechanical seed picking, the air suction seed picking device can better achieve single seed picking , which effectively reduces the problems of missing seeding and reseeding caused by insufficient seed quality during the sowing process. , High efficiency and other advantages. However, due to structural limitations, the air suction type seed picking device also has problems such as unstable seed picking operation, poor adaptability to seed picking objects, and poor versatility of seed picking parts. During the sowing operation of the machine tool, it is necessary to replace the seed picking parts according to the shape and size of the sowing seeds. Due to the complicated structural design of the air suction seeding device, the replacement process of the seed picking parts is cumbersome, which reduces the use efficiency of the seeding device and increases labor. Intensity, how to improve the adaptability of the seeding device of the air-suction seeder, satisfy the rapid and accurate seeding of different types of seeds, and enhance the versatility, reliability and efficiency of the seeding device. Promoting applications is of great significance.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a precision seed-taking device that can quickly replace the seed-picking tray, so as to realize the convenient and quick replacement of the seed-picking working parts, so as to adapt to seeds of different shapes and sizes , improve the versatility of the seed picking device.

The present invention is achieved through the following technical solutions:

A precision seed-taking device that can quickly replace the seed-picking tray, including a frame, the frame is provided with an air chamber, and the air chamber is provided with an air cavity with an open front end, and the open end of the front end of the air cavity is in the shape of Cylindrical with a gap, the open end of the front end of the air chamber is closed by a disc-shaped seed tray, and a transmission shaft is installed in the center of the air chamber, and the seed tray is installed on the transmission shaft through the seed tray replacement mechanism;

The seed disk replacement mechanism includes an inner adjustment cylinder, a squeeze piece, an outer adjustment cylinder, and adjustment parts. The inner adjustment cylinder and the outer adjustment cylinder are sequentially set on the transmission shaft from the inside to the outside. The transmission shaft, the inner adjustment cylinder, and the outer adjustment cylinder are three They will not rotate relative to each other in the circumferential direction. The inner adjustment cylinder can move axially with respect to the transmission shaft and the outer adjustment cylinder with respect to the inner adjustment cylinder. The front end of the inner adjustment cylinder is provided with a first limit flange, and the front end of the outer adjustment cylinder is provided with a There is a second limit flange, the extrusion piece and the seed tray are detachably set on the inner adjustment cylinder, the first limit flange, the extrusion piece, the seed tray and the second limit flange are sequentially arranged from front to back Arrangement, the diameter of the central hole of the seed tray is larger than the outer diameter of the first limiting flange and smaller than the outer diameter of the extruding sheet, the rear section of the outer adjustment cylinder is rotatably supported at the rear end of the air chamber, the rear end of the outer adjustment cylinder and the rear end of the inner adjustment cylinder Respectively protrude backward from the rear end of the air chamber and are connected by adjusting components, through which the inner adjusting cylinder and the outer adjusting cylinder can be adjusted to move in the opposite direction in the axial direction, so as to realize the first limit flange and the second limit flange Close to or far away from each other, thereby realizing the clamping or loosening of the pressing piece and the second limiting flange to the seed tray.

As a preferred solution of the above-mentioned seed picking device, the adjustment member includes an adjustment knob, the front end of which adjustment knob is rotatably mounted on the rear end of the air chamber and is vacantly sleeved on the drive shaft, and the inside of the adjustment knob is provided with a stepped hole with a large front and a small rear. The large hole end of the stepped hole is the first threaded hole, the small hole end of the stepped hole is the second threaded hole, the thread direction of the first threaded hole is opposite to that of the second threaded hole, and the rear end of the external adjustment cylinder is the first screw end. The rear end of the inner adjustment cylinder is the second screw end, the first screw end of the outer adjustment cylinder is threadedly connected to the first threaded hole of the adjustment knob, and the second screw end of the inner adjustment cylinder is connected to the second threaded hole of the adjustment knob. Threaded connection, the adjustment knob is rotated to drive the outer adjustment cylinder and the inner adjustment cylinder to move in the opposite direction along the axial direction.

As a preferred solution of the above-mentioned seed picking device, the front end of the transmission shaft is provided with a limit plate, and the front limit position of the inner adjustment cylinder is limited by the limit plate, and the step face of the step hole of the adjustment knob is adjusted inwardly. The rear limit position of the barrel moving backward is limited.

As a preferred solution of the above-mentioned seed picking device, the rear end of the step hole of the adjustment knob is provided with a rear end plate, and the adjustment knob is vacantly sleeved on the transmission shaft through the center hole of the rear end plate, and the inner adjustment cylinder is moved backward through the rear end plate The rear limit position is limited, and the front limit position of the inner adjustment cylinder is limited by the extrusion piece.

As a preferred solution of the above-mentioned seed picking device, the front end of the adjustment knob is installed on the rear end of the air chamber through the rotation of the pressure plate. Covered on the adjusting knob, an annular groove matching the annular flange is arranged inside the pressure plate, and the annular flange of the adjusting knob is placed in the annular groove.

As a preferred solution of the above-mentioned seed picking device, the extrusion piece is an annular piece with radial openings.

As a preferred solution of the above-mentioned seed picking device, a waist-shaped groove extending in the axial direction is opened on the outer wall of the inner adjustment cylinder, and a detent pin extending radially along the outer adjustment cylinder is fixedly connected to the outer adjustment cylinder. The inner end is embedded in the waist-shaped groove of the inner adjustment cylinder, and the diameter of the anti-rotation pin coincides with the width of the waist-shaped groove.

As a preferred solution of the above-mentioned seed picking device, the frame is provided with a seed box and a seed guide box, and the seed box and the seed guide box are arranged side by side on the front side of the seed tray, and the open end of the rear end of the seed box is connected to the seed tray. The front side is docked, and the inoculation box is located under the gap section of the air cavity, which is used to receive the seeds that fall from the seed suction hole on the seed tray due to loss of negative pressure.

As a preferred solution of the above-mentioned seed picking device, the bottom of the air chamber is mounted on the frame through a mounting plate, one side of the seed box is hinged on the mounting plate, and the other side of the seed box is locked with the mounting plate through a locking structure. One side of the seed guide box is provided with a hook, and the mounting plate is provided with a hook groove, and the seed guide box is hooked in the hook groove through the hook.

As a preferred solution of the above-mentioned seed picking device, the transmission shaft is rotatably mounted on the mounting base, the mounting base is fixed on the frame, and the transmission gear is fixedly sleeved on the transmission shaft.

Compared with the prior art, the present invention has the following advantages:

The present invention provides a precision seed-taking device capable of quickly replacing the seed-picking tray. The seed-picking tray is installed on the drive shaft through a seed tray replacement mechanism. The adjusting cylinder moves in the opposite direction along the axial direction, which can realize the clamping or loosening of the seed tray, and then realize the quick installation and disassembly of the seed tray, and realize the convenient and quick replacement of the seed picking working parts, so that it can be adjusted according to the Pick up the shape and size of the seeds and select the corresponding seed tray for quick replacement, realizing the precise and flexible seed picking of seeds of different shapes and sizes, improving the quality and efficiency of seed picking, and reducing the amount of labor and labor intensity ; At the same time, when the existing seeding device needs to be replaced according to the shape and size of the sowing material when the seeding working parts are used, the complex structure of the seeding device makes the replacement process more cumbersome, which causes the low efficiency of the seeder and the operation flexibility and adaptability. This design provides a new idea for the air-suction seeder to quickly pick different kinds of seeds and improve the efficiency and adaptability of the machine.

Description of drawings

Fig. 1 is an overall perspective view of the present invention.

Fig. 2 is a perspective view of the present invention after removing the seed guide box and opening the seed box.

Fig. 3 is a perspective view of the gas chamber of the present invention.

Fig. 4 is a perspective view of another viewing angle of the air chamber of the present invention.

Fig. 5 is a perspective view of the seed introduction box of the present invention.

Fig. 6 is a perspective view of the seed tray of the present invention.

Fig. 7 is a perspective view of the seed disc replacement mechanism of the present invention.

Fig. 8 is a plan view of the seed disc replacement mechanism of the present invention.

Fig. 9 is a perspective view of the inner regulating cylinder of the present invention.

Fig. 10 is a perspective view of the outer regulating cylinder of the present invention.

Fig. 11 is a perspective view of the extruded sheet of the present invention.

Fig. 12 is a perspective view of the adjusting knob of the present invention.

Fig. 13 is a perspective view of the platen of the present invention.

Labels in the figure: 1 frame, 2 air chamber, 3 air cavity, 4 gap, 5 seed tray, 6 transmission shaft, 7 mounting seat, 8 transmission gear, 9 seed box, 10 seed guide box, 11 seed suction hole, 12 Mounting plate, 13 Locking structure, 14 Hook, 15 Hook groove, 16 Inner adjustment cylinder, 17 Extrusion sheet, 18 Outer adjustment cylinder, 19 Waist groove, 20 Anti-rotation pin, 21 First limit flange, 22 Second limiting flange, 23 Adjusting knob, 24 Pressure plate, 25 Annular flange, 26 Mounting boss, 27 Annular groove, 28 First threaded hole, 29 Second threaded hole, 30 First screw end, 31 Second Screw end, 32 limit discs, 33 rear end plates, 34 air intake pipes.

Detailed ways

The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

Referring to Fig. 1 to Fig. 13, the present embodiment provides a precision seed-taking device capable of quickly replacing the seed-taking tray, including a frame 1, on which an air chamber 2 is provided, and an open front end is provided in the air chamber 2. The air chamber 3 at the mouth, one side of the air chamber 2 is provided with an air inlet pipe 34, and the negative pressure air source is connected externally through the air inlet pipe 34, the open end of the front end of the air chamber 3 is cylindrical with a section of gap 4, and the front end of the air chamber 3 The open end of the air chamber is closed by a disc-shaped seed disc 5, and a transmission shaft 6 is installed in the center of the air chamber 2, and the seed disc 5 is installed on the transmission shaft 6 by a seed disc replacement mechanism. Transmission shaft 6 is installed on the mounting base 7 through bearing rotation, and mounting base 7 is fixed on the frame 1, and transmission gear 8 is fixedly set on transmission shaft 6.

The frame 1 is provided with a seed box 9 and a seed guide box 10, and the seed box 9 and the seed guide box 10 are arranged side by side on the front side of the seed tray 5, and the open end of the rear end of the seed box 9 is docked with the front side of the seed tray 5 , the inoculation box is located at the position below the gap 4 of the air cavity 3, and is used to receive the seeds dropped from the seed suction hole 11 on the seed tray 5 due to loss of negative pressure.

The bottom of the air chamber 2 is installed on the frame 1 through the mounting plate 12, one side of the seed box 9 is hinged on the mounting plate 12, the other side of the seed box 9 is locked with the mounting plate 12 through the locking structure 13, and the seed box One side of 10 is provided with hook 14, and mounting plate 12 is provided with hook groove 15, and seed introduction box 10 is articulated in the hook groove 15 by hook 14.

The seed disk replacement mechanism includes an inner adjustment cylinder 16, an extrusion piece 17, an outer adjustment cylinder 18, and adjustment components. The inner adjustment cylinder 16 and the outer adjustment cylinder 18 are sequentially set on the transmission shaft 6 from the inside to the outside, and the transmission shaft 6 and the inner adjustment cylinder 16. The outer adjustment cylinder 18 will not rotate relative to each other in the circumferential direction. The inner adjustment cylinder 16 can move axially relative to the transmission shaft 6, and the outer adjustment cylinder 18 can move axially relative to the inner adjustment cylinder 16. There is a waist-shaped groove 19 extending in the axial direction, and the outer adjustment cylinder 18 is fixedly connected with a detent pin 20 extending radially along the outer adjustment cylinder 18, and the inner end of the detent pin 20 is inserted into the waist-shaped groove of the inner adjustment cylinder 16 In 19, the diameter of the anti-rotation pin 20 coincides with the width of the waist-shaped groove 19, and the cooperation between the anti-rotation pin 20 and the waist-shaped groove 19 realizes that the outer adjustment cylinder 18 can not rotate circumferentially relative to the inner adjustment cylinder 16, and can only Axial movement, tight fit between the inner adjustment cylinder 16 and the outer adjustment cylinder 18 can realize the sealing of the two, and at the same time, the two can move relative to each other in the axial direction. The inner adjustment cylinder 16 is connected to the transmission shaft 6 through a key and a keyway, and the key can move axially relative to the keyway, so that the inner adjustment cylinder 16 can not rotate circumferentially relative to the transmission shaft 6 but can only move axially. The front end of the inner adjustment cylinder 16 is provided with a first limit flange 21, and the front end of the outer adjustment cylinder 18 is provided with a second limit flange 22. The extrusion piece 17 and the seed tray 5 are detachably set on the inner adjustment cylinder 16. The extruding piece 17 is an annular piece with a radial opening, which is inserted through the radial opening of the extruding piece 17 and fitted on the inner regulating cylinder 16 to realize the detachable installation of the extruding piece 17 and the inner regulating cylinder 16 . The first limiting flange 21, the extruding piece 17, the seed disc 5 and the second limiting flange 22 are arranged sequentially from front to back, and the central hole diameter of the seed disc 5 is greater than the outer diameter of the first limiting flange 21 and Smaller than the outer diameter of the squeeze piece 17, the rear section of the outer adjustment cylinder 18 is rotatably supported on the rear end of the air chamber 2, and the rear end of the outer adjustment cylinder 18 and the rear end of the inner adjustment cylinder 16 protrude backward from the rear end of the air chamber 2 respectively and pass the adjustment The components are connected, and the inner adjustment cylinder 16 and the outer adjustment cylinder 18 are adjusted to move in the opposite direction in the axial direction through the adjustment components, so that the first limit flange 21 and the second limit flange 22 are close to each other or far away from each other, and then squeezed The pressing piece 17 and the second limiting flange 22 clamp or loosen the seed tray 5 . Wherein, the front side of the second limiting flange 22 is provided with a circle of annular mounting groove, and a sealing ring is embedded in the annular mounting groove, so as to improve the sealing effect when the front side of the second limiting flange 22 is fitted with the seed tray 5 .

The adjustment component comprises an adjustment knob 23, the front end of the adjustment knob 23 is rotated and installed on the rear end of the air chamber 2 and is sleeved on the transmission shaft 6, the front end of the adjustment knob 23 is rotated and installed on the rear end of the air chamber 2 through the pressure plate 24, and the front end of the adjustment knob 23 is arranged There is a ring-shaped flange 25, and there is a ring-shaped mounting boss 26 at the rear end of the air chamber 2. The pressure plate 24 is fixed on the mounting boss 26 at the rear end of the air chamber 2 by screws, and the pressure plate 24 is set on the adjusting knob 23. , the inside of the pressure plate 24 is provided with an annular groove 27 matching the annular flange 25, the annular flange 25 of the adjustment knob 23 is placed in the annular groove 27, and the annular flange 25 of the adjustment knob 23 can be placed in the annular groove of the pressure plate 24 Turn within 27. The inside of the adjustment knob 23 is provided with a stepped hole with a large front and a small rear. The large hole end of the stepped hole is the first threaded hole 28, and the small hole end of the stepped hole is the second threaded hole 29. The first threaded hole 28 and the second threaded hole 29 has opposite screw threads, the rear end of the outer adjustment cylinder 18 is the first screw end 30, the rear end of the inner adjustment cylinder 16 is the second screw end 31, and the first screw end 30 of the outer adjustment cylinder 18 is connected to the first screw end 30 of the adjustment knob 23. Threaded connection between the threaded holes 28, threaded connection between the second screw end 31 of the inner adjustment cylinder 16 and the second threaded hole 29 of the adjustment knob 23, and the rotation of the adjustment knob 23 drives the outer adjustment cylinder 18 and the inner adjustment cylinder 16 along the axis. Move in reverse.

The front end of the transmission shaft 6 is provided with a limit plate 32, through which the front limit position of the inner adjustment cylinder 16 is limited, and the step of the step hole of the adjustment knob 23 faces the backward movement of the inner adjustment cylinder 16. The rear limit position is limited.

The rear end of the step hole of the adjustment knob 23 is provided with a rear end plate 33, the adjustment knob 23 is sleeved on the transmission shaft 6 through the center hole of the rear end plate 33, and the rear limit position of the backward movement of the cylinder 16 is adjusted inwardly through the rear end plate 33 Positioning is performed, and the front limit position of the inner adjustment cylinder 16 moving forward is limited by the extruding piece 17 .

When working, first select a suitable seed tray 5 according to the shape and size of the seeds, open the lock structure 13 on the seed box 9, open the seed box 9, take off the seed guide box 10, and put the seed tray 5 through in turn. After passing the limit plate 32 at the front end of the transmission shaft 6 and the first limit flange 21 at the front end of the inner adjustment cylinder 16, it is empty sleeved on the inner adjustment cylinder 16, and the extrusion piece 17 is inserted through the radial opening on it and is empty sleeved. On the inner adjustment cylinder 16 , and the extrusion piece 17 is located between the seed tray 5 and the first limiting flange 21 at the front end of the inner adjustment cylinder 16 . Turn the adjustment knob 23 clockwise to reduce the distance between the first stop flange 21 at the front end of the inner adjustment cylinder 16 and the second limit flange 22 at the front end of the outer adjustment cylinder 18, and the inner adjustment cylinder 16 moves backward to make The first spacer flange 21 of its front end pushes the extruding piece 17 to fit the front side of the seed tray 5, and the outer adjustment cylinder 18 moves forward so that the second spacer flange 22 at the front end of the outer adjustment cylinder 18 is in contact with the seed collection plate 5. The rear sides of the disk 5 are attached to each other, and the seed-taking disk 5 is clamped under the co-extrusion of the second limiting flange 22 and the extrusion piece 17 by turning the adjustment knob 23, and it is tightly attached to the air chamber 2. The open end of cavity 3 front ends finishes the installation of getting seed disc 5, closes seed case 9 afterwards, hangs up seed guide box 10. Open power source, power drives transmission shaft 6 to rotate by transmission gear 8, and transmission shaft 6 drives seed-taking disc 5 to rotate together by the inner regulating cylinder 16 of the seed disc replacement mechanism installed on it, extruding piece 17, outer regulating cylinder 18, Under the negative pressure in the air chamber 3 of the air chamber 2, the seeds in the seed box 9 are adsorbed on the seed suction hole 11 of the seed tray 5. When the seed suction hole 11 turns out of the air chamber 3, it is located in the gap 4 of the air chamber 3 When the section is placed, the negative pressure disappears, and the seeds adsorbed on the seed tray 5 fall into the seed introduction box 10 installed below under the action of its own weight. Then it is introduced into the downstream sowing parts through the inoculation box, and the seed taking process is completed.

When it is necessary to sow different materials and replace the seed tray 5 as needed, first open the locking structure 13 on the seed box 9, open the seed box 9 to clean out the remaining materials inside, and remove the seed guide box 10, and turn it counterclockwise Adjust the knob 23 to increase the distance between the first spacer flange 21 at the front end of the inner adjustment cylinder 16 and the second spacer flange 22 at the front end of the outer adjustment cylinder 18, and the second spacer flange 22 and the extrusion piece 17 Loosen the seed tray 5, first remove the extrusion piece 17 along the radial direction, then take out the seed tray 5 forward along the axis direction, install the seed tray 5 that needs to be replaced on the drive shaft 6 and clamp it Get the seed tray 5, close the seed box 9, and hook the hook 14 on the seed guide box 10 in the hook groove 15, and complete the quick replacement of the seed tray 5 of the seed pickup device.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention. Inside.

Claims (10)

1. A precision seed-taking device that can quickly replace the seed-picking disc, comprising a frame (1), said frame (1) being provided with an air chamber (2), characterized in that: said air chamber (2) ) is provided with an air cavity (3) with an open front end, the open end of the front end of the air cavity (3) is cylindrical with a gap (4), and the open end of the front end of the air cavity (3) passes through a disc-shaped The seed tray (5) is closed, and the center of the air chamber (2) is rotated to be provided with a transmission shaft (6), and the seed tray (5) is installed on the transmission shaft (6) through the seed tray replacement mechanism; The seed disc replacement mechanism includes an inner adjustment cylinder (16), an extrusion piece (17), an outer adjustment cylinder (18), and adjustment components, and the inner adjustment cylinder (16) and the outer adjustment cylinder (18) are sequentially set on the On the transmission shaft (6), the transmission shaft (6), the inner adjustment cylinder (16), and the outer adjustment cylinder (18) will not rotate relative to each other along the circumferential direction, and the inner adjustment cylinder (16) will rotate relative to the transmission shaft (6) 1. The outer adjustment cylinder (18) can move axially relative to the inner adjustment cylinder (16). The front end of the inner adjustment cylinder (16) is provided with a first limit flange (21), and the front end of the outer adjustment cylinder (18) is provided with a second Two spacer flanges (22), the extruding piece (17) and the seed tray (5) are detachably set on the inner adjustment cylinder (16), the first spacer flange (21), the extruding piece (17) ), the seed disc (5) and the second limiting flange (22) are arranged sequentially from front to back, and the diameter of the center hole of the seed disc (5) is larger than the outer diameter of the first limiting flange (21) and smaller than the extrusion The outer diameter of the sheet (17), the rear section of the outer adjustment cylinder (18) is rotatably supported on the rear end of the air chamber (2), the rear end of the outer adjustment cylinder (18) and the rear end of the inner adjustment cylinder (16) are separated from the air chamber (2) respectively. The rear end protrudes backward and is connected by an adjusting part, through which the inner adjusting cylinder (16) and the outer adjusting cylinder (18) can be adjusted to move in the opposite direction in the axial direction, so as to realize the alignment between the first limiting flange (21) and the second The two limiting flanges (22) approach or move away from each other, thereby realizing the clamping or loosening of the pressing piece (17) and the second limiting flange (22) to the seed tray (5). 2. A precision seed-taking device capable of quickly replacing the seed-picking tray according to claim 1, characterized in that: the adjustment member includes an adjustment knob (23), and the front end of the adjustment knob (23) is rotatably mounted on The rear end of the air chamber (2) is empty on the drive shaft (6), and the inside of the adjustment knob (23) is provided with a step hole with a large front and a small rear. The large hole end of the step hole is the first threaded hole (28), and the step The small hole end of the hole is the second threaded hole (29), the thread direction of the first threaded hole (28) is opposite to that of the second threaded hole (29), and the rear end of the outer adjustment cylinder (18) is the first screw end (30 ), the rear end of the inner adjustment cylinder (16) is the second screw end (31), and the thread between the first screw end (30) of the outer adjustment cylinder (18) and the first threaded hole (28) of the adjustment knob (23) connection, threaded connection between the second screw end (31) of the inner adjustment cylinder (16) and the second threaded hole (29) of the adjustment knob (23), and the rotation of the adjustment knob (23) drives the outer adjustment cylinder (18) and The inner regulating cylinder (16) moves in the opposite direction along the axial direction. 3. A precision seed-taking device capable of quickly replacing the seed-taking disc as claimed in claim 2, characterized in that: the front end of the transmission shaft (6) is provided with a limit disc (32), and the limit disc (32) ) limit the front limit position of the inner adjustment cylinder (16) moving forward, and limit the rear limit position of the inner adjustment cylinder (16) moving backward by the step face of the step hole of the adjustment knob (23). 4. A kind of precision seed-taking device capable of quickly replacing the seed-taking disc as claimed in claim 2, characterized in that: the rear end of the step hole of the adjustment knob (23) is provided with a rear end plate (33), and the adjustment The knob (23) is sleeved on the drive shaft (6) through the center hole of the rear end plate (33), and the rear limit position of the inner adjustment cylinder (16) is limited by the rear end plate (33). The pressure sheet (17) limits the front limit position of the inner adjustment cylinder (16) moving forward. 5. A precision seed-taking device capable of quickly replacing the seed-picking disc according to claim 2, characterized in that: the front end of the adjustment knob (23) is installed in the air chamber (2) through the rotation of the pressure plate (24) At the rear end, the front end of the adjustment knob (23) is provided with a ring-shaped flange (25), and the pressure plate (24) is fixedly installed on the rear end of the air chamber (2), and the pressure plate (24) is empty on the adjustment knob (23) On the inside of the pressure plate (24) there is an annular groove (27) matching the annular flange (25), and the annular flange (25) of the adjustment knob (23) is placed in the annular groove (27). 6 . The precise seed-taking device capable of quickly replacing the seed-picking disc according to claim 2 , wherein the pressing piece ( 17 ) is an annular piece with a radial opening. 7 . 7. A precision seed-taking device that can quickly replace the seed-taking disc as claimed in claim 2, characterized in that: a waist-shaped groove ( 19), the outer adjusting cylinder (18) is fixedly connected with the anti-rotation pin (20) extending radially along the outer adjustment cylinder (18), and the inner end of the anti-rotation pin (20) is embedded in the waist shape of the inner adjustment cylinder (16). In the groove (19), the diameter of the locking pin (20) matches the width of the waist-shaped groove (19). 8. A precision seed-taking device capable of quickly replacing the seed-picking disc as claimed in claim 1, characterized in that: the frame (1) is provided with a seed box (9) and a seed guide box (10) , the seed box (9) and the seed guide box (10) are arranged side by side on the front side of the seed tray (5), the open end of the rear end of the seed box (9) is docked with the front side of the seed tray (5), and the inoculation box is located at The position below the notch (4) section of the air cavity (3) is used to accept seeds dropped from the seed suction hole (11) on the seed tray (5) due to loss of negative pressure. 9. A precision seed-taking device capable of quickly replacing the seed-taking tray according to claim 8, characterized in that: the bottom of the air chamber (2) is installed on the frame (1) through the mounting plate (12) , one side of the seed box (9) is hinged on the mounting plate (12), the other side of the seed box (9) is locked with the mounting plate (12) through the locking structure (13), and the seed guide box (10) is Side is provided with hook (14), and mounting plate (12) is provided with hook groove (15), and seed introduction box (10) is articulated in the hook groove (15) by hook (14). 10. A precision seed-taking device capable of quickly replacing the seed-taking disc as claimed in claim 1, characterized in that: the transmission shaft (6) is rotatably mounted on the mounting base (7), and the mounting base (7) It is fixed on the frame (1), and a transmission gear (8) is fixedly sleeved on the transmission shaft (6).

Images