CN210038863U

CN210038863U - Seeding quantity on-line monitoring device based on linear array CCD

Info

Publication number: CN210038863U
Application number: CN201920592569.XU
Authority: CN
Inventors: 向阳; 熊瑛; 陈益千; 李亚军; 林洁雯; 胡正方
Original assignee: Hunan Agricultural University
Current assignee: Hunan Agricultural University
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2020-02-07
Anticipated expiration: 2029-04-28

Abstract

The utility model discloses a seeding volume on-line monitoring device based on linear array CCD comprises monitoring devices casing, parallel light source, spotlight convex lens and linear array CCD, the monitoring devices casing is provided with the seed passageway along vertical direction, parallel light source with spotlight convex lens installs relatively the both sides of seed passageway, linear array CCD installs spotlight convex lens for the monitoring plane of perpendicular to seed passageway is constituted through parallel light to other one side of seed passageway, assembles the effective photosensitive area of linear array CCD through spotlight lens with the parallel light in the monitoring plane, realizes the monitoring and the count to the seed through the light intensity change of light sensing element on the monitoring linear array CCD to realize the monitoring to the seeding volume of seeder. Compared with the prior art, the utility model has the advantages of sensing element is in large quantity, no monitoring blind area, can realize monitoring to the small-size seed and can monitor the condition of many seeds whereabouts simultaneously.

Description

Seeding quantity on-line monitoring device based on linear array CCD

Technical Field

The utility model relates to a seeder seeding volume monitoring technology field especially relates to a seeding volume on-line monitoring device based on linear array CCD.

Background

Development of accurate agriculture is beneficial to reducing resource waste, protecting environment and promoting agricultural sustainable development. Accurate sowing is an important link in accurate agriculture, and can reduce seed waste, improve crop yield and increase economic benefit. The variable seeding is an important component of precise seeding and is an automatic control system for automatically adjusting the seeding rate according to different seed consumption of different plots. The existing seeder adopts a mechanical seed sowing device, the sowing process is carried out under the totally-enclosed condition, an operator cannot master the actual sowing quantity of the seeder and adjust the sowing quantity, and meanwhile, when the seed box is short of seeds, the seed conveying pipe is blocked and other faults occur, the seeding leakage can be caused, and the sowing quality is influenced. Therefore, the method has far-reaching significance for monitoring the seeding quantity of the seeder in real time, improving the seeding quality, realizing variable seeding and developing accurate agriculture.

The sensors adopted by the existing seeding rate monitoring device mainly comprise a capacitance sensor, a piezoelectric sensor and a photoelectric sensor. The photoelectric sensor is most widely applied, and the working principle of the photoelectric sensor is to monitor and count the seeds by intercepting infrared rays when the seeds pass through a seed sowing channel. The photoelectric sensor usually adopts one or more infrared rays, cannot realize the comprehensive coverage of the seed discharging channel, is easy to form a monitoring blind area to cause missed detection, and is difficult to monitor small-size seeds such as rapeseeds and the like and simultaneously fall for a plurality of seeds.

Disclosure of Invention

The utility model aims to have the monitoring blind area to current seeder seeding volume monitoring devices, take place easily to leak to examine, be difficult to monitor small-size seed and be difficult to the problem that falls to monitor simultaneously many grain seeds, provide a seeding volume on-line monitoring devices based on linear array CCD.

For realizing the purpose of the utility model, the utility model discloses an adopt following technical scheme: the utility model provides a seeding volume on-line monitoring device based on linear array CCD, comprises monitoring devices casing, parallel light source, spotlight convex lens and linear array CCD install the inside of monitoring devices casing, the monitoring devices casing is provided with the seed passageway along vertical direction, parallel light source with spotlight convex lens installs relatively the both sides of seed passageway, linear array CCD installs spotlight convex lens for the other one side of seed passageway, parallel light source's light emitting area with linear array CCD's the parallel and all perpendicular to spotlight convex lens's optical axis.

The parallel light source consists of a point light source and a light source convex lens, the light emitting point of the point light source is positioned on the focus of the light source convex lens, and the scattered light emitted by the point light source is changed into parallel light through the light source convex lens to vertically penetrate through the seed channel.

The distance between the optical center of the convex condenser lens and the photosensitive surface of the linear array CCD is smaller than the focal length of the convex condenser lens, the distance is set to ensure that the light emitted by the parallel light source is converged to the effective photosensitive area length of the linear array CCD after passing through the convex condenser lens, and the distance can be specifically calculated by adopting the following formula: the distance between the optical center of the condenser convex lens and the linear array CCD photosensitive surface = the focal length of the condenser convex lens-the focal length of the condenser convex lens x the effective photosensitive area length of the linear array CCD photosensitive surface/the diameter of the condenser convex lens.

The linear array CCD has 128 photosensitive elements which are linearly and uniformly distributed to form a linear effective photosensitive area, and can realize continuous and uniform light intensity monitoring of 128 points. In the seed channel, a plane which is parallel to the direction of the parallel light and penetrates through the linear effective photosensitive area of the linear array CCD is a monitoring plane, the monitoring plane is perpendicular to the seed channel, and the parallel light in the monitoring plane is converged to the effective photosensitive area of the linear array CCD through the condensing convex lens. When the seeds pass through the monitoring plane, the continuous parallel light rays are intercepted, so that the light intensity of a plurality of continuous photosensitive elements on the linear array CCD is changed. And monitoring the seeds by analyzing the output signals of the photosensitive elements on the linear array CCD.

The monitoring devices casing is in the top of seed passageway is provided with top seed metering pipe connector, the below of seed passageway is provided with below seed metering pipe connector, through top seed metering pipe connector and below seed metering pipe connector can with the utility model discloses install on the seed metering pipe of seeder seed metering ware below.

The inner wall of the monitoring device shell is covered with a light absorption material so as to prevent the interference of the inner wall of the monitoring device shell on monitoring caused by the reflection of light.

The beneficial effects of the utility model are that, a seeding volume on-line monitoring device based on linear array CCD is provided, constitute the monitoring plane of perpendicular to seed passageway through parallel light to through condenser lens with monitoring in the plane parallel light assemble linear array CCD's effective photosensitive region, the luminous intensity change through light sensing element on the monitoring linear array CCD realizes the monitoring and the count to the seed, thereby realizes the monitoring to the seeder seeding volume. As 128 photosensitive elements are continuously and densely distributed in the effective photosensitive area of the linear array CCD, the monitoring of small-size seeds and the monitoring of non-blind areas in a monitoring plane can be realized, and the monitoring of the simultaneous falling condition of a plurality of seeds can be realized.

Drawings

Fig. 1 is a top full-sectional view of the present invention.

Fig. 2 is a front view of the present invention.

Fig. 3 is a schematic view of the seed monitoring principle of the present invention.

In the figure: 1. a monitoring device housing; 2. a collimated light source; 21. a point light source; 22. a light source convex lens; 3. a seed channel; 4. a condensing convex lens; 5. linear array CCD; 6. an upper seed discharge pipe interface; 7. a seed tube interface below; 8. and (4) seeds.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

The utility model discloses a overlook the total cut-away view as shown in fig. 1, as shown in fig. 2 do the utility model discloses a front view, a seeding quantity on-line monitoring device based on linear array CCD comprises monitoring devices casing 1, parallel light source 2, spotlight convex lens 4 and linear array CCD 5. The parallel light source 2 is composed of a point light source 21 and a light source convex lens 22. The monitoring device shell 1 is provided with a seed channel 3 along the vertical direction, an upper seed discharging pipe interface 6 is arranged above the seed channel 3, and a lower seed discharging pipe interface 7 is arranged below the seed channel 3. The inner wall of the monitoring device housing 1 is covered with a light absorbing material to prevent the reflection of light by the inner wall of the monitoring device housing 1 from causing interference with the monitoring. The parallel light source 2 and the condensing convex lens 4 are oppositely arranged at two sides of the seed channel 3, and the linear array CCD5 is arranged at the other side of the condensing convex lens 4 opposite to the seed channel 3. The point light source 21 is installed at the focus of the light source convex lens 22. Scattered light rays emitted by the point light source 21 pass through the light source convex lens 22 and then become parallel light rays, pass through the seed channel 3, and are converged on the photosensitive surface of the linear array CCD5 after passing through the light condensing convex lens 4. The distance between the optical center of the condensing convex lens 4 and the photosensitive surface of the linear CCD5 is set to make the diameter of the light spot converged on the photosensitive surface of the linear CCD5 after the parallel light rays pass through the condensing convex lens 4 equal to the length of the effective photosensitive area of the linear CCD 5.

When in use, the utility model is arranged below the single seed outlet of the seed sowing device of the seeding machine, the upper seed sowing pipe interface 6 is connected to the seed sowing pipe connected with the seed outlet of the seeding machine, and the lower seed sowing pipe interface 7 is connected to the seed sowing pipe outputting seeds to the ground. When the seeder works, seeds discharged by the seed metering device enter the seed channel 3 through the upper seed metering pipe interface 6 and are then discharged through the lower seed metering pipe interface 7.

As shown in fig. 3, the principle and schematic diagram of seed monitoring of the present invention is that when the seeds pass through the monitoring plane in the seed channel 3, the seeds will intercept the continuous light, resulting in the change of the light intensity on the linear array CCD5 for a plurality of continuous photosensitive elements. The seeds are monitored and counted by monitoring the light intensity change of the light sensing element on the linear array CCD5, so that the seeding amount of the seeding machine is monitored. As 128 photosensitive elements are continuously and densely distributed in the effective photosensitive area of the linear array CCD5, the monitoring of small-size seeds and the non-blind area monitoring in a monitoring plane can be realized. When a plurality of seeds fall through the monitoring plane at the same time, the light sensing element signals of a plurality of areas are changed on the linear array CCD5, so that the condition of the falling of the plurality of seeds at the same time can be monitored.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art will be able to make various modifications and changes without departing from the spirit and scope of the invention, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. The utility model provides a seeding volume on-line monitoring device based on linear array CCD, characterized by comprises monitoring devices casing, parallel light source, spotlight convex lens and linear array CCD install the inside of monitoring devices casing, the monitoring devices casing is provided with the seed passageway along vertical direction, parallel light source with spotlight convex lens installs relatively the both sides of seed passageway, linear array CCD installs spotlight convex lens for the other one side of seed passageway, parallel light source's light emitting area with linear array CCD's the photosensitive surface is parallel and all perpendicular to spotlight convex lens's optical axis.

2. The device according to claim 1, wherein the collimated light source comprises a point light source and a convex light source lens, and the light emitting point of the point light source is located at the focal point of the convex light source lens.

3. The device for monitoring seeding rate on line based on the linear array CCD as claimed in claim 1, wherein the distance between the optical center of the condenser convex lens and the photosensitive surface of the linear array CCD is smaller than the focal length of the condenser convex lens.

4. The device according to claim 1, wherein the distance between the optical center of the convex condenser lens and the photosensitive surface of the linear array CCD is set such that the diameter of the light spot formed by the light emitted from the collimated light source passing through the convex condenser lens and focused on the photosensitive surface of the linear array CCD is equal to the length of the effective photosensitive area of the linear array CCD.

5. The device for monitoring seeding rate on line based on the linear array CCD as claimed in claim 1, wherein the distance between the optical center of the condensing convex lens and the photosensitive surface of the linear array CCD is calculated by the following formula: the distance between the optical center of the condenser convex lens and the linear array CCD photosensitive surface = the focal length of the condenser convex lens-the focal length of the condenser convex lens x the effective photosensitive area length of the linear array CCD photosensitive surface/the diameter of the condenser convex lens.

6. The device for monitoring seeding rate on line based on the linear array CCD of claim 1, wherein the number of the photosensitive elements of the linear array CCD is 128.

7. The linear array CCD-based online sowing quantity monitoring device as claimed in claim 1, wherein the monitoring device housing is provided with an upper sowing pipe interface above the seed channel and a lower sowing pipe interface below the seed channel.

8. The in-line monitoring device for seeding rate based on linear array CCD of claim 1, wherein the inner wall of the monitoring device shell is covered with light absorbing material.