Laser through-beam type missed seeding detection device for seed drill

Abstract

A laser through-beam type missed seeding detection device for a seed drill comprises a seed drill base (1); a plurality of seed drill ground wheels (4) are provided on the lower side of the seed drill base; a seed box (2) is mounted on the upper side of the seed drill base; a seeding tube (6) communicated with the seed box is mounted below the seed drill base; an acousto-optic alarm (3) is mounted on the upper side of the seed drill base; a connecting assembly (5) is slidably and elastically fitted with one side of the seed drill base; and missed seeding detection assemblies (7) electrically connected to the acousto-optic alarm are symmetrically arranged on two sides of the inner wall of the seeding tube. Further disclosed is a laser through-beam type missed seeding detection method for a seed drill. Once missed seeding is detected, an acousto-optic alarm gives an alarm, thereby intuitively informing an operator of the occurrence of an anomaly during seeding.

Description

A laser reflection type seeding machine missing seeding detection device and method TECHNICAL FIELD

[0001] The present application belongs to the field of seeding machines, in particular, relates to a laser reflection type seeding machine missing seeding detection device and method. BACKGROUND

[0002] The seeding machine usually includes a furrowing mechanism for digging a seeding trench, a seeding mechanism for sowing seeds, and a covering mechanism for covering the seeding trench after seeding, and the ideal seeding effect is that the seeding mechanism uniformly sows seeds along the seeding trench, but due to the structural defects of the seeding mechanism or the defects in the control of the seeding machine during operation, the missing seeding may occur, which means that the seeds are sown intermittently, resulting in uneven sowing and affecting the sowing quality and the yield of crops.

[0003] Most of the currently used seeding machines are mechanical seeding machines, and the seeders are in a full-closed state during operation, and once the problems such as emptying of the seed tank and over-speed of the seeder occur, the missing seeding phenomenon will occur, thereby causing the reduction of crop yield. At present, the main research methods for missing seeding detection technology include machine vision technology, high-speed photography method, and artificial naked-eye inspection, the machine vision technology is applied to the detection of the seeding performance of the seeder, but the image processing has great limitations and cannot achieve precision detection; the high-speed photography method has long processing time, high cost, and high requirements for the working environment.

[0004] A seeding machine based on fluorescence principle for missing seeding detection and a detection method thereof are disclosed in Chinese Patent No. CN107836165A, which comprises a seeding machine shell and a stirring device, a seeding device, a missing seeding detection device, and a data acquisition device arranged in the seeding machine shell, the stirring device comprises a seed storage tank, an engine, and a stirrer connected to the engine; the seeding device is arranged below the seed inlet, and comprises a seeding tank, a seeder, and a motor, and the bottom of the seeding tank is further provided with a seeding port; the seeder comprises a seeding wheel and a brush, and a plurality of seeding holes are arranged on the side wall of the seeding wheel; the seeding wheel is further connected to the motor; and Chinese Patent No. CN109526325A discloses a corn seeding machine missing and reseeding detection and control device, which comprises a seeding machine frame, a seeding assembly is installed on one side of the top end of the seeding machine frame, and the seeding assembly comprises a seeding tank, a cover plate, an infrared sensor, a seeding pipe, a seeder, a motor box, a stepping motor, a photoelectric sensor, and a small tank, although the device can work normally under poor seeding conditions and improves the working accuracy of the seeding machine, but the height of the seeding tank of the above-mentioned device is fixed, and it is not suitable for different convex seeding lands, and can only be connected to a single height dragging machine, thereby affecting the applicability of the device.

[0005] Therefore, the present application is proposed.

[0006] SUMMARY

[0007] The technical problem solved by the present application is to overcome the deficiencies of the prior art, and provide a laser reflection type seeding machine missing seeding detection device and method, which solves the problems raised in the background art.

[0008] To solve the above technical problems, the basic idea of the technical solution of the present application is:

[0009] A laser reflection type seeding machine missing seeding detection device and method, comprising: a seeding machine base, a plurality of seeding machine ground wheels are arranged on the lower side of the seeding machine base, a seeding box is arranged on the upper side of the seeding machine base, a seeding pipe is arranged below the seeding machine base and is in communication with the seeding box, an audible and visual alarm is arranged on the upper side of the seeding machine base, and a connecting assembly is slidably and elastically arranged on one side of the seeding machine base.

[0010] A missing seeding detection assembly electrically connected to the audible and visual alarm is symmetrically arranged on both sides of the inner wall of the seeding pipe, a lifting assembly connected to the seeding machine ground wheels is arranged in the seeding machine base, and a driving member drivingly connected to the plurality of lifting assemblies is arranged on one side of the seeding machine base.

[0011] Optionally, a fixing groove is symmetrically arranged on both sides of the inner wall of the seeding pipe, the missing seeding detection assembly comprises a detection box arranged in the fixing groove, a laser lamp and a photoelectric sensor arranged on one side of the detection box, and a controller electrically connected to the laser lamp and the photoelectric sensor and arranged in the detection box, and the controller is electrically connected to the audible and visual alarm.

[0012] Optionally, the lifting assembly comprises a rectangular groove arranged on the lower side of the seeding machine base, a rectangular rod slidably arranged in the rectangular groove, and a threaded telescopic rod rotationally arranged in the seeding machine base, the output end of the threaded telescopic rod is fixedly connected to the rectangular rod, and the seeding machine ground wheels are arranged at the lower end of the rectangular rod; an inner cavity in communication with the plurality of rectangular grooves is arranged in the seeding machine base, and the plurality of threaded telescopic rods are rotationally arranged in the inner cavity; a first synchronous wheel is arranged on the periphery of each of the plurality of threaded telescopic rods, a synchronous belt is sleeved between the plurality of first synchronous wheels, a rotating rod is rotationally arranged in the inner cavity, a second synchronous wheel engaged with the synchronous belt is arranged on the periphery of the rotating rod, and the rotating rod is drivingly connected to the driving member; a fixed plate is arranged at the bottom of the inner cavity, a worm wheel is arranged on the periphery of the rotating rod, a worm rotationally engaged with the worm wheel is arranged on one side of the fixed plate, and the driving member is arranged at the end of the worm penetrating through the seeding machine base; the driving member comprises a handle arranged at the end of the worm penetrating through the seeding machine base or a motor arranged on one side of the seeding machine base and having an output end fixedly connected to the worm.

[0013] When the height of the seeding machine base needs to be adjusted, the driving member drives the worm to rotate, the worm drives the worm wheel to rotate, the worm wheel drives the rotating rod to rotate, the rotating rod drives the second synchronous wheel to rotate, the second synchronous wheel drives the plurality of first synchronous wheels to rotate through the synchronous belt, the plurality of first synchronous wheels drives the plurality of threaded telescopic rods to rotate, the plurality of threaded telescopic rods drives the plurality of rectangular rods to move in the plurality of rectangular grooves through the output end, and the plurality of rectangular rods drives the seeding machine ground wheel to lift, so that the height of the seeding machine base can be adjusted, on the one hand, the seeding height of the seeding tube can be adjusted, and the seeding machine is suitable for seeding land with different heights, and on the other hand, the height of the connecting assembly can be adjusted, and the seeding machine is suitable for dragging machinery with different heights.

[0014] Optionally, a groove is formed in one side of the seeding machine base, a protrusion is slidably and elastically matched in the groove, the connecting assembly comprises a connecting rod rotatably matched on one side of the protrusion, a connecting disc arranged at one end of the connecting rod, and a plurality of connecting holes arranged in a circumferential array on one side of the connecting disc; the cross section of the groove is convex, an elastic member is arranged between the groove and the protrusion, a limiting groove is formed in one side of the protrusion, and a limiting block is rotatably matched in the limiting groove and fixedly connected with the connecting rod.

[0015] A laser transmission type seeding machine missing seeding detection method is suitable for the laser transmission type seeding machine missing seeding detection device, and comprises the following steps:

[0016] Step one: the seeds in the seeding box slide to the seeding tube under the action of gravity, the seeding tube is in a dark condition, two symmetrical laser lamps are in transmission, and the photoelectric sensors on the two detection boxes receive the light of the laser lamps;

[0017] Step two: when the photoelectric sensors do not receive the light of the laser lamps, it is judged that the seeds in the seeding tube slide continuously, and there is no missing seeding;

[0018] Step three: when one of the photoelectric sensors receives the light of the laser lamps, it is judged that the seeds in the seeding tube slide discontinuously, and there is missing seeding, and the controller controls the sound-light alarm to alarm;

[0019] Step four: when the photoelectric sensors receive the light of the laser lamps, it is judged that there is no seed in the seeding tube, and there is missing seeding, and the controller controls the sound-light alarm to alarm.

[0020] After the above technical scheme is adopted, the present application has the following beneficial effects compared with the prior art, of course, any product implementing the present application does not necessarily need to achieve all the advantages described below:

[0021] Through the symmetrical seed missing detection assembly arranged in the seed tube, two symmetrical laser lamps can be shot, the two sides of the laser are blocked, the photoelectric sensor cannot receive the laser, and the seed continues to be sown, when the photoelectric sensors on the two sides both receive the laser, the seed tube has no seed, seed missing is detected, and an audible and visual alarm is used for alarming, through the audible and visual alarm, workers can be directly and intuitively notified of the abnormality in the sowing process, and the existing seeding machine can be directly transformed, and the transformation cost is low.

[0022] The connecting assembly arranged on the seeding machine base is convenient for assembling or disassembling and separating the seeding machine base and the towing machine.

[0023] The multiple lifting assemblies arranged in the seeding machine base can drive the seeding machine ground wheel to lift through the multiple lifting assemblies, so that the height of the seeding machine base can be adjusted, on the one hand, the sowing height of the seed tube can be adjusted, and the seeding machine is suitable for different height seeding land, on the other hand, the height of the connecting assembly can be adjusted, and the towing machine is suitable for different height towing machines.

[0024] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings. In the drawings

[0026] In the drawings:

[0027] Fig. 1 is a schematic structural view of a seed missing detection device of a seeding machine;

[0028] Fig. 2 is a schematic structural view of a seed missing detection device of a seeding machine;

[0029] Fig. 3 is a schematic structural view of a seeding box;

[0030] Fig. 4 is a schematic structural view of a seed missing detection assembly;

[0031] Fig. 5 is a schematic structural view of a lifting assembly;

[0032] Fig. 6 is a schematic structural view of the inside of a seeding machine base;

[0033] Fig. 7 is a schematic structural view of a connecting assembly.

[0034] The components represented by the reference signs in the drawings are listed as follows: a seeder base 1, a seeding box 2, an audible and visual alarm 3, a seeder ground wheel 4, a connecting assembly 5, a connecting rod 501, a connecting disc 502, a connecting hole 503, a seeding pipe 6, a missed seeding detection assembly 7, a detection box 701, a laser lamp 702, a photoelectric sensor 703, a fixing groove 8, a lifting assembly 10, a rectangular rod 1001, a rectangular groove 1002, a screw telescopic rod 1003, an inner cavity 11, a first synchronous wheel 12, a synchronous belt 13, a rotating rod 14, a second synchronous wheel 15, a worm wheel 16, a fixing plate 17, a worm 18, a driving piece 19, a groove 20, a protruding block 21, an elastic piece 22, a limiting groove 23, and a limiting block 24.

[0035] It should be noted that the drawings and the written description are not intended to limit the scope of the concept of the present application in any way, but are merely to illustrate the concept of the present application to a person skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0036] The present application will now be further described in detail with reference to the drawings.

[0037] Please refer to FIGS. 1-7, in the embodiment, a laser transmission type missed seeding detection device and method for a seeder is provided, which comprises a seeder base 1, a plurality of seeder ground wheels 4 are arranged on the lower side of the seeder base 1, a seeding box 2 is arranged on the upper side of the seeder base 1, a seeding pipe 6 is arranged below the seeder base 1 and is in communication with the seeding box 2, an audible and visual alarm 3 is arranged on the upper side of the seeder base 1, and a connecting assembly 5 is slidably and elastically arranged on one side of the seeder base 1.

[0038] The inner walls of the seeding pipe 6 are symmetrically provided with missed seeding detection assemblies 7 which are electrically connected to the audible and visual alarm 3, a lifting assembly 10 is arranged in the seeder base 1 and is connected to the seeder ground wheels 4, and a driving piece 19 is arranged on one side of the seeder base 1 and is in driving cooperation with the plurality of lifting assemblies 10.

[0039] Through the symmetrically arranged missed seeding detection assemblies 7 in the seeding pipe 6, two symmetric laser lamps 702 can be used for transmission, the laser on both sides is blocked, and the photoelectric sensor 703 cannot receive the laser. When the photoelectric sensors 703 on both sides receive the laser, it indicates that the seed sowing pipe is empty, the missed seeding is detected, and the audible and visual alarm 3 is used for alarming. Through the audible and visual alarm 3, the staff can be directly notified of the abnormality in the seeding process, and the existing seeder can be directly modified with low modification cost.

[0040] The connecting assembly 5 arranged on the seeder base 1 facilitates the assembly or disassembly of the seeder base 1 and the towing machine; the multiple lifting assemblies 10 arranged in the seeder base 1 can drive the seeder wheel 4 to lift through the multiple lifting assemblies 10, and the height of the seeder base 1 can be adjusted, on the one hand, the height of the seeding pipe 6 can be adjusted, which is suitable for different height seeding land, on the other hand, the height of the connecting assembly 5 can be adjusted, which is suitable for different height towing machines.

[0041] As shown in FIGS. 2-3, the inner wall of the seeding pipe 6 of the embodiment is symmetrically provided with a fixing groove 8 on both sides, the missing seeding detection assembly 7 includes a detection box 701 arranged in the fixing groove 8, a laser lamp 702 and a photoelectric sensor 703 arranged on one side of the detection box 701, and a controller arranged in the detection box 701 and electrically connected with the laser lamp 702 and the photoelectric sensor 703, the controller is electrically connected with the sound-light alarm 3.

[0042] When the two symmetrical laser lamps 702 are opposite, the photoelectric sensors 703 on the two detection boxes 701 receive the light of the laser lamp 702; when neither of the photoelectric sensors 703 receives the light of the laser lamp 702, it is judged that the seeds in the seeding pipe 6 slide continuously, and there is no missing seeding; when one of the photoelectric sensors 703 receives the light of the laser lamp 702, it is judged that the seeds in the seeding pipe 6 slide discontinuously, and there is missing seeding, the controller controls the sound-light alarm 3 to alarm; when both of the photoelectric sensors 703 receive the light of the laser lamp 702, it is judged that there is no seed in the seeding pipe 6, and there is missing seeding, the controller controls the sound-light alarm 3 to alarm, which can directly notify the staff of the abnormality in the seeding process, and can be directly modified on the existing seeder with low modification cost.

[0043] As shown in FIGS. 4-6, the lifting assembly 10 of the embodiment comprises a rectangular slot 1002 opened in the lower side of the seeder base 1, a rectangular rod 1001 slidingly fitted in the rectangular slot 1002, a threaded telescopic rod 1003 rotationally fitted in the seeder base 1, the output end of the threaded telescopic rod 1003 being fixedly connected with the rectangular rod 1001, and the seeder ground wheel 4 being arranged at the lower end of the rectangular rod 1001; the seeder base 1 is provided with an inner cavity 11 communicating with the plurality of rectangular slots 1002, and the plurality of threaded telescopic rods 1003 are rotationally fitted in the inner cavity 11; the plurality of threaded telescopic rods 1003 are each provided with a first synchronous wheel 12, a synchronous belt 13 is sleeved between the plurality of first synchronous wheels 12, a rotating rod 14 is rotationally fitted in the inner cavity 11, the rotating rod 14 is provided with a second synchronous wheel 15 on the side thereof, the second synchronous wheel 15 is engaged with the synchronous belt 13, and the rotating rod 14 is in transmission cooperation with a driving member 19; a fixed plate 17 is arranged at the bottom of the inner cavity 11, a worm wheel 16 is arranged on the side of the rotating rod 14, a worm 18 engaged with the worm wheel 16 is rotationally fitted on one side of the fixed plate 17, and the driving member 19 is arranged at the end of the worm 18 penetrating through the seeder base 1; the driving member 19 comprises a handle arranged at the end of the worm 18 penetrating through the seeder base 1 or a motor arranged on one side of the seeder base 1 and having an output end fixedly connected with the worm 18.

[0044] When it is necessary to adjust the height of the seeder base 1, the driving member 19 drives the worm 18 to rotate, the worm 18 drives the worm wheel 16 to rotate, the worm wheel 16 drives the rotating rod 14 to rotate, the rotating rod 14 drives the second synchronous wheel 15 to rotate, the second synchronous wheel 15 drives the plurality of first synchronous wheels 12 to rotate through the synchronous belt 13, the plurality of first synchronous wheels 12 drive the plurality of threaded telescopic rods 1003 to rotate, the plurality of threaded telescopic rods 1003 drive the plurality of rectangular rods 1001 to move in the plurality of rectangular slots 1002 through the output ends, and the plurality of rectangular rods 1001 drive the seeder ground wheel 4 to lift, so that the height of the seeder base 1 can be adjusted, on the one hand, the seeding height of the seeding tube 6 can be adjusted, and the seeder is suitable for seeding at different heights, and on the other hand, the height of the connecting assembly 5 can be adjusted, and the seeder is suitable for being towed by a towing machine at different heights.

[0045] As shown in FIG. 7, one side of the seeder base 1 is provided with a groove 20, a protrusion 21 is slidingly and elastically fitted in the groove 20, the connecting assembly 5 comprises a connecting rod 501 rotationally fitted on one side of the protrusion 21, a connecting disc 502 arranged at one end of the connecting rod 501, and a plurality of connecting holes 503 circularly arranged on one side of the connecting disc 502; the cross section of the groove 20 is convex, an elastic member 22 is arranged between the groove 20 and the protrusion 21, a limiting slot 23 is opened on one side of the protrusion 21, a limiting block 24 is rotationally fitted in the limiting slot 23, and the limiting block 24 is fixedly connected with the connecting rod 501, wherein the elastic member 22 is a shock-absorbing spring or a shock absorber in the prior art.

[0046] When the seeder base 1 needs to be assembled with the towing machine, a plurality of bolts are inserted into the plurality of connecting holes 503 to be connected with the towing machine, and the plurality of bolts are fastened on the connecting disc 502 by using the nuts, so that the seeder base 1 can be assembled with the towing machine, when the towing machine enters a bumpy road section, the protrusion 21 slides in the groove 20, the protrusion 21 extrudes the elastic piece 22 to be compressed, so that the inertia of the seeder base 1 is buffered, and the limiting block 24 rotates in the limiting groove 23, so that the left and right shaking of the towing machine driving the seeder base 1 to shake is reduced.

[0047] In the embodiment, a laser shooting type seed missing detection method is provided, which is suitable for the laser shooting type seed missing detection device in any of the above embodiments, and includes the following steps:

[0048] Step one: the seeds in the seed box 2 slide to the seeding pipe 6 under the action of gravity, the seeding pipe 6 is in a dark condition, the two symmetrical laser lamps 702 are opposite to each other, and the photoelectric sensors 703 on the two detection boxes 701 receive the light of the laser lamps 702;

[0049] Step two: when the photoelectric sensors 703 do not receive the light of the laser lamps 702, it is judged that the seeds in the seeding pipe 6 slide continuously, and there is no seed missing;

[0050] Step three: when one of the photoelectric sensors 703 receives the light of the laser lamps 702, it is judged that the seeds in the seeding pipe 6 slide discontinuously, and there is seed missing, and the controller controls the sound-light alarm 3 to alarm;

[0051] Step four: when the photoelectric sensors 703 receive the light of the laser lamps 702, it is judged that there is no seed in the seeding pipe 6, and seed missing occurs, and the controller controls the sound-light alarm 3 to alarm.

[0052] Through the seed missing detection assembly 7 arranged symmetrically in the seeding pipe 6, the two symmetrical laser lamps 702 are opposite to each other, the laser on both sides is blocked, the photoelectric sensor 703 cannot receive the laser, then the seeds continue to be seeded, when the photoelectric sensors 703 on both sides receive the laser, it is detected that the seeding pipe has no seeds, seed missing is detected, and the sound-light alarm 3 alarms, through the sound-light alarm 3, the staff can be directly notified that an abnormality occurs in the seeding process.

[0053] The present application is not limited to the above-mentioned embodiments, and any person should know that the structural changes made under the inspiration of the present application fall within the protection scope of the present application. The technical, shape and structure parts not described in detail in the present application are all known technologies.

Claims

1. A laser-guided seeder for detecting missed seeding, characterized in that, include: Seeder base (1), multiple seeder wheels (4) are provided on the lower side of the seeder base (1), a seed box (2) is installed on the upper side of the seeder base (1), a seeding pipe (6) connected to the seed box (2) is installed below the seeder base (1), an audible and visual alarm (3) is installed on the upper side of the seeder base (1), and a connecting component (5) is slidably and elastically fitted on one side of the seeder base (1). The inner walls of the seeding tube (6) are symmetrically provided with a missed seeding detection component (7) electrically connected to the sound and light alarm (3). The base (1) of the seeder is equipped with a lifting component (10) connected to the ground wheel (4) of the seeder. The base (1) of the seeder is equipped with a drive component (19) that is in transmission cooperation with multiple lifting components (10) on one side.

2. The laser-guided seeder missed seed detection device according to claim 1, characterized in that, The inner wall of the seeding tube (6) is symmetrically provided with fixing grooves (8). The missed seeding detection component (7) includes a detection box (701) set in the fixing groove (8), a laser lamp (702) and a photoelectric sensor (703) installed on one side of the detection box (701), and a controller installed in the detection box (701) and electrically connected to the laser lamp (702) and the photoelectric sensor (703). The controller is electrically connected to the audible and visual alarm (3).

3. The laser-guided seeder missed seed detection device according to claim 1, characterized in that, The lifting assembly (10) includes a rectangular groove (1002) opened on the lower side of the seeder base (1), a rectangular rod (1001) slidably fitted in the rectangular groove (1002), and a threaded telescopic rod (1003) rotatably fitted in the seeder base (1). The output end of the threaded telescopic rod (1003) is fixedly connected to the rectangular rod (1001), and the seeder ground wheel (4) is installed at the lower end of the rectangular rod (1001).

4. The laser-guided seeder missed seed detection device according to claim 3, characterized in that, The seeder base (1) has an inner cavity (11) that communicates with multiple rectangular grooves (1002), and multiple threaded telescopic rods (1003) are rotatably engaged in the inner cavity (11).

5. A laser-guided seeder missed seed detection device according to claim 4, characterized in that, Multiple threaded telescopic rods (1003) are equipped with first synchronous pulleys (12) on their periphery, and a synchronous belt (13) is sleeved between the multiple first synchronous pulleys (12). A rotating rod (14) is rotatably fitted inside the inner cavity (11), and a second synchronous pulley (15) that meshes with the synchronous belt (13) is installed on the periphery of the rotating rod (14). The rotating rod (14) is in transmission cooperation with the driving component (19).

6. A laser-guided seeder missed seed detection device according to claim 5, characterized in that, A fixed plate (17) is installed at the bottom of the inner cavity (11), a worm wheel (16) is installed around the rotating rod (14), a worm (18) is rotatably engaged with the worm wheel (16) on one side of the fixed plate (17), and a drive component (19) is installed at the end of the worm (18) that passes through the seeder base (1).

7. A laser-guided seeder missed seed detection device according to claim 6, characterized in that, The drive unit (19) includes a throttle mounted on the end of the worm (18) that passes through the end of the seeder base (1) or a motor mounted on one side of the seeder base (1) and whose output end is fixedly connected to the worm (18).

8. A laser-guided seeder missed seed detection device according to claim 1, characterized in that, The base (1) of the seeder has a groove (20) on one side, and a protrusion (21) slides and elastically fits in the groove (20). The connecting component (5) includes a connecting rod (501) rotatably fitted on one side of the protrusion (21), a connecting plate (502) installed on one end of the connecting rod (501), and a plurality of connecting holes (503) arranged in a circular array on one side of the connecting plate (502).

9. A laser-guided seeder missed seed detection device according to claim 8, characterized in that, The groove (20) has a convex cross-section. An elastic element (22) is installed between the groove (20) and the protrusion (21). A limiting groove (23) is opened on one side of the protrusion (21). A limiting block (24) is rotatably fitted in the limiting groove (23). The limiting block (24) is fixedly connected to the connecting rod (501).

10. A laser-guided seeder method for detecting missed seeding, characterized in that, A laser-guided seeder missed seed detection device applicable to any one of the laser-guided seeding types described in claims 1-9, comprising: Step 1: The seeds in the seeding box (2) slide down to the seeding tube (6) under the action of gravity. The seeding tube (6) is dark. Two symmetrical laser lights (702) shine on each other. The photoelectric sensors (703) on the two detection boxes (701) receive the light from the laser lights (702). Step 2: When neither of the two photoelectric sensors (703) receives light from the laser lamp (702), it is determined that the seeds in the seeding tube (6) are continuously falling and there is no missed seeding. Step 3: When one of the photoelectric sensors (703) receives the light from the laser lamp (702), it is determined that the seeds in the seeding tube (6) are not falling continuously and there is a missed seeding. The controller controls the sound and light alarm (3) to sound an alarm. Step 4: When both photoelectric sensors (703) receive the light from the laser lamp (702), it is determined that there are no seeds in the seeding tube (6) and a seeding failure has occurred. The controller then controls the sound and light alarm (3) to sound an alarm.

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