CN111771467A - A accurate seeder for plug seedling - Google Patents

Abstract

The invention discloses a precise seeding device for plug seedling, and relates to the technical field of agricultural machinery. The invention includes a substrate; the upper surface of the base plate is provided with a plug; a seeding box is fixed above the hole disc; the seeding box is provided with an upper bottom wall and a lower bottom wall which are arranged in parallel; a bearing strip and a negative pressure air supply box are arranged above the upper bottom wall side by side; the bearing strip and the negative pressure air supply box are respectively connected to the inner part of the sowing box through a plurality of telescopic parts; the telescopic part can drive the carrying strip and the negative pressure air supply box to synchronously move up and down; the bearing strip is connected with the negative pressure air supply box through a plurality of negative pressure air transmission boxes arranged side by side; one surface of the negative pressure gas supply box is provided with a plurality of negative pressure gas supply holes which correspond to the negative pressure gas transmission box in parallel. The hole tray seeding machine is simple and reasonable in structural design and convenient to use, effectively improves hole tray seeding efficiency, and has high market application value.

Description

A accurate seeder for plug seedling

Technical Field

The invention belongs to the technical field of agricultural machinery, and particularly relates to a precise seeding device for plug seedling.

Background

In the process of seedling raising of seeds, sowing is an important basic link. The seeding device is the premise and the foundation for realizing the transplanting and the cultivation of crops, can ensure that the seedling production achieves high quality and high efficiency, improves the purity and the survival rate of the seedling species, and is beneficial to the stable and rapid development of the seedling industry. With the rapid development of agricultural machinery technology in China, higher requirements are put forward on seeding and seedling raising technology, and the quality of the performance of a seeding device directly influences the quality and the growth condition of seedlings.

At present, most of precision seeding equipment for plug seedling in the prior art adopts a drum-type seeding mode. For example, patent document No. CN105723887B entitled air-suction vibration drum-type precision seeding device includes a seeding frame, a drum device, a transmission device, a positive and negative pressure air supply device and a seed box device, wherein the drum device is connected to a support through screws, the transmission device is located on an upper rack, the positive and negative pressure air supply device is located on the upper rack, and the seed box device is connected to the upper rack through screws; although the device can realize accurate seed sucking action, when the suction nozzle with the seeds moves to the position right below the roller and is in a seed falling preparation stage, the roller is always in a rotating state, so that the seeds in the suction nozzle have certain forward movement initial speed in the process of falling downwards after being separated from negative pressure constraint, namely the seeds fall downwards in a parabola form, and the position of the seeds falling onto the plug tray has uncertainty factors, and the reduction of the void rate of the plug tray is difficult to ensure. Therefore, there is a need to develop a precision seeding apparatus for plug seedling in order to solve the above problems.

Disclosure of Invention

The present invention is directed to a precision seeding apparatus for plug seedling, which is designed to solve the above-mentioned problems of the prior art.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to a precise seeding device for plug seedling, which comprises a substrate; a plug tray is placed on the upper surface of the base plate; a seeding box is fixed above the hole tray; the seeding box is provided with an upper bottom wall and a lower bottom wall which are arranged in parallel; a bearing strip and a negative pressure air supply box are arranged above the upper bottom wall side by side; the bearing strip and the negative pressure air supply box are respectively connected to the inner part of the sowing box through a plurality of telescopic parts; the telescopic part can drive the carrying strip and the negative pressure air supply box to synchronously move up and down; the bearing strip is connected with the negative pressure air supply box through a plurality of negative pressure air transmission boxes arranged side by side; a plurality of negative pressure air supply holes corresponding to the negative pressure air transmission box are arranged on one surface of the negative pressure air supply box side by side; one end of the negative pressure gas transmission box is of an opening structure, and the port is connected to the outer port of the negative pressure gas supply hole; the bottom wall of the negative pressure gas transmission box is provided with a plurality of negative pressure gas transmission holes in parallel along the length direction; a negative pressure pipe is vertically fixed at the lower port of the negative pressure gas transmission hole; the lower end of the negative pressure pipe penetrates through the upper bottom wall and extends to a position between the upper bottom wall and the lower bottom wall; the negative pressure pipe is in sliding fit with the upper bottom wall; the upper end of the negative pressure pipe is provided with a vent hole corresponding to the negative pressure gas transmission hole; a seed suction hole and a needle penetration hole which is coaxial with the seed suction hole are radially arranged on the outer wall of the negative pressure pipe; a piston is arranged in the negative pressure pipe in a sliding manner; the upper surface of the piston is connected with the upper end of the negative pressure pipe through a tension spring; the upper surface of the piston is provided with a blocking sheet; the outer side surface of the barrier sheet is attached to the inner side surface of the negative pressure tube; the blocking sheet is used for blocking the needle penetrating hole so as to avoid forming a negative pressure state in the needle penetrating hole; a plurality of positive pressure air supply channels corresponding to the negative pressure air transmission boxes are arranged in parallel in the lower bottom wall; the top wall of the positive pressure air supply channel is provided with a plurality of air supply holes corresponding to the negative pressure air delivery holes; a positive pressure gas transmission column is vertically fixed at the upper port of the gas supply hole; the upper end of the positive pressure gas transmission column is inserted into the lower end part of the negative pressure pipe in a sliding manner; a positive pressure air conveying passage communicated with the air supply hole is axially formed in the positive pressure air conveying column; the upper end part of the positive pressure gas transmission column is radially provided with a positive pressure gas transmission hole communicated with the positive pressure gas transmission channel; the positive pressure gas transmission hole corresponds to the seed suction hole in position, and the seed suction hole can be communicated with the positive pressure gas transmission hole; the upper end of the positive pressure gas transmission column is radially provided with a needle passing channel corresponding to the needle penetrating hole in a through way; the needle passing channel can be communicated with the needle penetrating hole; a slide pipe is vertically fixed on one side of the positive pressure gas transmission column; the tube sliding device is characterized in that the tube sliding device is fixedly inserted on the lower bottom wall; one port of the slide pipe is abutted against the negative pressure pipe and corresponds to the positive pressure gas transmission hole in position; the other port of the seed sliding pipe is arranged outside the sowing box and corresponds to the position of the hole tray; a pair of power strips is symmetrically arranged between the upper bottom wall and the lower bottom wall; the power strip is arranged in the seeding box in a sliding manner; the power strip and the bearing strip are arranged in parallel; the two power strips are connected through a plurality of movable strips arranged side by side; the plurality of movable strips correspond to the plurality of negative pressure gas transmission boxes one by one; a plurality of impurity removing needles corresponding to the needle passing channels are vertically fixed on one surface of the movable strip side by side.

Furthermore, a seed supply box with an opening structure at the upper end and the lower end is fixed above the seeding box; the inside level of confession seed case has been installed a kind and has been all planted.

Further, the seed homogenizing plate can move up and down in the seed supply box; the upper surface of the seed equalizing plate is at least vertically connected with an elastic component; the upper end of the elastic component is connected with the upper port of the seed supply box; and at least one vibration motor is fixed on the lower surface of the seed homogenizing plate.

Furthermore, a positive pressure air supply box corresponding to the lower bottom wall is fixed on one outer side wall of the sowing box; a plurality of through holes corresponding to the positive pressure air supply channel are formed in one side surface of the positive pressure air supply box in parallel; one end of the positive pressure air supply channel extends to an outer side wall of the sowing box and is communicated with the through hole.

The invention has the following beneficial effects:

according to the invention, the plurality of negative pressure pipes are vertically inserted into the upper bottom wall of the sowing box, and the telescopic component is utilized to drive the seed suction holes to move up and down above and below the upper bottom wall, so that vertical seed suction and seed discharging are realized, seeds can accurately fall into corresponding positions in the hole tray, the structure design is simple and reasonable, the use is convenient, the hole tray sowing efficiency is effectively improved, full tray sowing can be carried out on one hole tray at one time, the sowing operation can be continuously carried out, the void fraction and the multi-grain fraction are effectively reduced, and the market application value is higher.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of a precision seeding device for plug seedling of the present invention;

FIG. 2 is a front view of the structure of FIG. 1;

FIG. 3 is a side view of the structure of FIG. 1;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 3;

FIG. 5 is a schematic view of the connection structure of the carrying strip, the negative pressure air supply box and the negative pressure air delivery box.

In the drawings, the components represented by the respective reference numerals are listed below:

1-base plate, 101-supporting column, 2-hole tray, 3-seeding box, 4-carrying strip, 5-negative pressure air supply box, 6-telescopic part, 7-negative pressure air supply box, 8-negative pressure tube, 9-piston, 10-tension spring, 11-positive pressure air supply column, 12-slide tube, 13-power strip, 14-movable strip, 15-impurity cleaning needle, 16-seed supply box, 17-seed homogenizing plate, 18-elastic part, 19-vibration motor, 20-positive pressure air supply box, 301-upper bottom wall, 302-lower bottom wall, 501-negative pressure air supply hole, 801-vent hole, 802-suction hole, 803-needle penetrating hole, 701-negative pressure air supply hole, 901-blocking sheet, 1101-positive pressure air supply channel, 1102-positive pressure air supply hole, 1103-needle passing channel, 3021-positive pressure air supply channel, 3022-positive pressure air supply hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, the present invention is a precision seeding device for plug seedling, comprising a substrate 1; a plug tray 2 is arranged on the upper surface of the base plate 1; a supporting column 101 is vertically fixed on each opposite side of the plug 2; a seeding box 3 with an opening structure at the upper part is fixed above the hole disc 2; the sowing box 3 is fixed on the supporting column 101; the sowing box 3 is provided with an upper bottom wall 301 and a lower bottom wall 302 which are arranged in parallel; a carrying strip 4 and a negative pressure air supply box 5 are arranged above the upper bottom wall 301 in parallel; the length of the carrying strip 4 is consistent with that of the negative pressure air supply box 5; the bearing strip 4 and the negative pressure air supply box 5 are respectively connected to the inside of the sowing box 3 through a plurality of telescopic parts 6; the telescopic part 6 is arranged above the carrying strip 4 or the negative pressure air supply box 5; the telescopic part 6 is fixed at the upper opening of the sowing box 3; the telescopic part 6 can drive the carrying strip 4 and the negative pressure air supply box 5 to synchronously move up and down; telescopic member 6 conventional hydraulic cylinder in the art;

the negative pressure air supply box 5 can be connected with a negative pressure fan through a negative pressure air delivery pipe; the carrying strip 4 is connected with the negative pressure air supply box 5 through a plurality of negative pressure air transmission boxes 7 arranged side by side; the negative pressure gas transmission box 7 is vertical to the negative pressure gas supply box 5; a plurality of negative pressure air supply holes 501 corresponding to the negative pressure air transmission box 7 are arranged in parallel on one surface of the negative pressure air supply box 5; one end of the negative pressure gas transmission box 7 is of an opening structure, and the port is connected to the outer port of the negative pressure gas supply hole 501; the inside of the negative pressure gas transmission box 7 is communicated with the inside of the negative pressure gas supply box 5 through a negative pressure gas supply hole 501; a plurality of negative pressure air transmission holes 701 are formed in the bottom wall of the negative pressure air transmission box 7 in parallel along the length direction; a negative pressure pipe 8 is vertically fixed at the lower port of the negative pressure gas transmission hole 701;

the lower end of the negative pressure pipe 8 penetrates through the upper bottom wall 301 and extends between the upper bottom wall 301 and the lower bottom wall 302; the negative pressure pipe 8 is in sliding fit with the upper bottom wall 301; the upper end of the negative pressure pipe 8 is provided with a vent hole 801 corresponding to the negative pressure gas transmission hole 701; the inside of the negative pressure pipe 8 is communicated with the inside of the negative pressure gas transmission box 7 through a vent hole 801 and a negative pressure gas transmission hole 701; a seed suction hole 802 and a needle penetrating hole 803 which is coaxial with the seed suction hole 802 are radially arranged on the outer wall of the negative pressure pipe 8; the outer end part of the seed suction hole 802 is in a trumpet-shaped structure, and the diameter of the outer port of the seed suction hole 802 is larger than that of the inner port thereof; the diameter of the inner end part of the seed suction hole 802 is smaller than the minimum size of the seed, namely the seed cannot enter the seed suction hole 802; the diameter of the pinhole 803 is consistent with the diameter of the inner end part of the seed suction hole 802;

a piston 9 made of rubber is arranged in the negative pressure pipe 8 in a sliding way; the upper surface of the piston 9 is connected with the upper end of the negative pressure pipe 8 through a tension spring 10; the outer side wall of the piston 9 is attached to the inner side wall of the negative pressure pipe 8; the upper surface of the piston 9 is provided with a stop sheet 901 with a horizontal cross section in a semicircular structure; the outer side surface of the barrier sheet 901 is attached to the inner side surface of the negative pressure tube 8; the blocking sheet 901 is used for blocking the needle penetrating hole 803 so as to avoid forming a negative pressure state in the needle penetrating hole 803;

a plurality of positive pressure air supply channels 3021 corresponding to the negative pressure air delivery box 7 are arranged in parallel in the lower bottom wall 302; the top wall of the positive pressure air supply channel 3021 is provided with a plurality of air supply holes 3022 corresponding to the negative pressure air delivery holes 701; a positive pressure gas transmission column 11 is vertically fixed at the upper port of the gas supply hole 3022; the positive pressure gas transmission column 11 and the negative pressure pipe 8 are coaxially arranged; the upper end of the positive pressure gas transmission column 11 is inserted into the lower end part of the negative pressure pipe 8 in a sliding way; the positive pressure gas transmission column 11 is in clearance fit with the negative pressure pipe 8; a positive pressure gas transmission channel 1101 communicated with the gas supply hole 3022 is axially arranged in the positive pressure gas transmission column 11;

the upper end part of the positive pressure gas transmission column 11 is radially provided with a positive pressure gas transmission hole 1102 communicated with the positive pressure gas transmission channel 1101; the positive pressure gas transmission hole 1102 corresponds to the seed suction hole 802 in position, and the seed suction hole 802 can be communicated with the positive pressure gas transmission hole 1102; the upper end of the positive pressure gas transmission column 11 is radially provided with a needle passing channel 1103 corresponding to the needle penetrating hole 803 in a penetrating way; the needle passing channel 1103 can be communicated with the needle penetrating hole 803;

a seed sliding pipe 12 in an arc structure is vertically fixed on one side of the positive pressure gas transmission column 11; the seed chute 12 is fixedly inserted on the lower bottom wall 302; one end port of the seed sliding pipe 12 is abutted against the negative pressure pipe 8, and the end port corresponds to the positive pressure gas transmission hole 1102 in position; when the inner port of the seed suction hole 802 is communicated with the positive pressure gas transmission hole 1102, the outer port of the seed suction hole 802 is communicated with one port of the seed chute 12; the other end of the seed sliding pipe 12 is arranged outside the sowing box 3 and corresponds to the position of the hole disc 2;

a pair of power strips 13 are symmetrically arranged between the upper bottom wall 301 and the lower bottom wall 302; the power strip 13 is arranged inside the sowing box 3 in a sliding way; an electric push rod is fixed above the power strip 13 along the length direction; the output end of the electric push rod is connected with the power strip 13; the power strip 13 is arranged in parallel with the bearing strip 4; the two power strips 13 are connected through a plurality of movable strips 14 arranged side by side; the plurality of movable strips 14 correspond to the plurality of negative pressure gas transmission boxes 7 one by one; a plurality of impurity removing needles 15 corresponding to the needle passing channels 1103 are vertically fixed on one surface of the movable strip 14 side by side; when the needle passing passage 1103 is communicated with the needle passing hole 803, the impurity removing needle 15 on the movable strip 14 is driven by the power strip 13 to sequentially pass through the needle passing hole 803 and the needle passing passage 1103 and then be inserted into the seed suction hole 802, so that impurities in the seed suction hole 802 can be effectively removed.

The working process is as follows: firstly, placing a seed suction hole 802 above the upper bottom wall 301 for seed suction, then driving a negative pressure pipe 8 to move downwards by a telescopic part 6, communicating the seed suction hole 802 with a positive pressure gas transmission hole 1102, blowing seeds into a seed chute 12 and freely dropping into a plug 2; then the telescopic part 6 drives the negative pressure pipe 8 to move upwards to the position where the needle penetrating hole 803 is communicated with the needle passing channel 1103, the power strip 13 is utilized to drive the impurity cleaning needle 15 on the movable strip 14 to sequentially penetrate through the needle penetrating hole 803 and the needle passing channel 1103 and then to be inserted into the seed suction hole 802, and impurities in the seed suction hole 802 can be effectively cleaned; after cleaning, the impurity cleaning needle 15 is reset, and the telescopic component drives the negative pressure pipe to continuously move upwards to the seed suction position; by repeating the above operations, a plurality of the plug trays 2 can be precisely seeded.

Wherein, a seed supply box 16 with an opening structure at the upper end and the lower end is fixed above the seeding box 3; the seed box 16 is fixed on the support column 101; a seed homogenizing plate 17 is horizontally arranged in the seed supply box 16; the upper surface of the seed homogenizing plate 17 is provided with a plurality of seed homogenizing holes; the seed homogenizing plate 17 can move up and down in the seed supply box 16; the upper surface of the seed homogenizing plate 17 is vertically connected with a plurality of elastic components 18; the elastic part 18 is arranged at the edge of the seed equalizing plate 17; the upper end of the elastic component 18 is connected with the upper port of the seed supply box 16; a vibration motor 19 is fixed on the lower surface of the seed homogenizing plate 17; the elastic part 18 comprises a support rod and a rod sleeve; the supporting rod is in sliding fit in the rod sleeve; the support rod is sleeved with a return spring.

Wherein, a positive pressure air supply box 20 corresponding to the lower bottom wall 302 is fixed on an outer side wall of the sowing box 3; the positive pressure air supply box 20 can be connected with a positive pressure fan through a positive pressure air conveying pipe; a plurality of through holes corresponding to the positive pressure air supply passage 3021 are formed in parallel in one side surface of the positive pressure air supply box 20; one end of the positive pressure air supply passage 3021 extends to an outer side wall of the sowing box 3 and is communicated with the through hole.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (4)

1. A precision seeding device for plug seedling, which comprises a base plate (1); a plug (2) is placed on the upper surface of the base plate (1); a seeding box (3) is fixed above the hole tray (2); the method is characterized in that:

the seeding box (3) is provided with an upper bottom wall (301) and a lower bottom wall (302) which are arranged in parallel; a carrying strip (4) and a negative pressure air supply box (5) are arranged above the upper bottom wall (301) side by side; the bearing strip (4) and the negative pressure air supply box (5) are respectively connected to the inner part of the sowing box (3) through a plurality of telescopic parts (6); the telescopic part (6) can drive the carrying strip (4) and the negative pressure air supply box (5) to synchronously move up and down;

the bearing strip (4) is connected with the negative pressure air supply box (5) through a plurality of negative pressure air transmission boxes (7) which are arranged side by side; a plurality of negative pressure air supply holes (501) corresponding to the negative pressure air transmission box (7) are arranged on one surface of the negative pressure air supply box (5) side by side; one end of the negative pressure gas transmission box (7) is of an opening structure, and the port is connected to the outer port of the negative pressure gas supply hole (501); the bottom wall of the negative pressure gas transmission box (7) is provided with a plurality of negative pressure gas transmission holes (701) in parallel along the length direction; a negative pressure pipe (8) is vertically fixed at the lower port of the negative pressure gas transmission hole (701);

the lower end of the negative pressure pipe (8) penetrates through the upper bottom wall (301) and extends to a position between the upper bottom wall (301) and the lower bottom wall (302); the negative pressure pipe (8) is in sliding fit with the upper bottom wall (301); the upper end of the negative pressure pipe (8) is provided with a vent hole (801) corresponding to the negative pressure air transmission hole (701); a seed suction hole (802) and a needle penetrating hole (803) which is coaxial with the seed suction hole (802) are radially arranged on the outer wall of the negative pressure pipe (8);

a piston (9) is arranged in the negative pressure pipe (8) in a sliding way; the upper surface of the piston (9) is connected with the upper end of the negative pressure pipe (8) through a tension spring (10); a blocking sheet (901) is arranged on the upper surface of the piston (9); the outer side surface of the barrier sheet (901) is attached to the inner side surface of the negative pressure pipe (8); the blocking sheet (901) is used for blocking the needle penetrating hole (803) so as to avoid forming a negative pressure state in the needle penetrating hole (803);

a plurality of positive pressure air supply channels (3021) corresponding to the negative pressure air delivery boxes (7) are arranged in parallel in the lower bottom wall (302); the top wall of the positive pressure air supply channel (3021) is provided with a plurality of air supply holes (3022) corresponding to the negative pressure air delivery holes (701); a positive pressure gas transmission column (11) is vertically fixed at the upper port of the gas supply hole (3022); the upper end of the positive pressure gas transmission column (11) is inserted into the lower end part of the negative pressure pipe (8) in a sliding manner; a positive pressure air delivery passage (1101) communicated with the air supply hole (3022) is axially formed in the positive pressure air delivery column (11);

the upper end part of the positive pressure gas transmission column (11) is radially provided with a positive pressure gas transmission hole (1102) communicated with the positive pressure gas transmission channel (1101); the positive pressure gas transmission hole (1102) corresponds to the seed suction hole (802) in position, and the seed suction hole (802) can be communicated with the positive pressure gas transmission hole (1102); the upper end of the positive pressure gas transmission column (11) is radially provided with a needle passing channel (1103) corresponding to the needle passing hole (803) in a penetrating way; the needle passing channel (1103) can be communicated with a needle penetrating hole (803);

a pipe chute (12) is vertically fixed on one side of the positive pressure gas transmission column (11); the pipe chute (12) is fixedly inserted on the lower bottom wall (302); one port of the slide pipe (12) is abutted against the negative pressure pipe (8), and the port corresponds to the positive pressure gas transmission hole (1102); the other port of the seed sliding pipe (12) is arranged outside the sowing box (3) and corresponds to the position of the hole disc (2);

a pair of power strips (13) is symmetrically arranged between the upper bottom wall (301) and the lower bottom wall (302); the power strip (13) is arranged in the seeding box (3) in a sliding manner; the power strip (13) and the carrying strip (4) are arranged in parallel; the two power strips (13) are connected through a plurality of movable strips (14) arranged side by side; the plurality of movable strips (14) correspond to the plurality of negative pressure gas transmission boxes (7) one by one; a plurality of impurity removing needles (15) corresponding to the needle passing channels (1103) are vertically fixed on one surface of the movable strip (14) side by side.

2. A rotary type rapid plug seeding device according to claim 1, wherein a seed supplying box (16) with an open structure at both upper and lower ends is fixed above the seeding box (3); the inside level of confession seed case (16) is equipped with a kind and all boards (17).

3. A plug seeding device with a built-in impurity removal structure according to claim 2, characterized in that the seed homogenizing plate (17) can move up and down in the seed supply box (16); the upper surface of the seed equalizing plate (17) is at least vertically connected with an elastic component (18); the upper end of the elastic component (18) is connected with the upper port of the seed supply box (16); the lower surface of the seed homogenizing plate (17) is at least fixed with a vibration motor (19).

4. A precision plug seeding device based on vertical seed suction and discharge, according to any one of claims 1 to 3, characterized in that a positive pressure air supply box (20) corresponding to the lower bottom wall (302) is fixed on an outer side wall of the seeding box (3); a plurality of through holes corresponding to the positive pressure air supply channel (3021) are arranged in parallel on one side surface of the positive pressure air supply box (20); one end of the positive pressure air supply channel (3021) extends to the outer side wall of the sowing box (3) and is communicated with the through hole.

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