CN103091166A - Method, device and system for determining compressive strength of coated seed - Google Patents

Abstract

The invention provides a method, a device and a system for determining compressive strength of a coated seed. The method comprises the following steps of: acquiring the real-time pressure applied on a coated seed; monitoring the change of the real-time pressure, so as to obtain the reduction difference of the real-time pressure; and calculating the compressive strength value of the coated seed according to the real-time pressure reduction difference. With the method, the device and the system for determining the compressive strength of the coated seed, the problems of poor accuracy and low automation degree in the detection on the compressive strength of the coated seed are solved, the detection accuracy is improved, the detection efficiency is improved, the operation is simple and convenient, and the required human input is small.

Description

Method, device and system for measuring compressive strength of coated seeds

technical field

The invention relates to a detection technology of coated seeds, in particular to a method, device and system for measuring the compressive strength of coated seeds.

Background technique

Coated seeds are seeds obtained by pelleting technology. Seed granulation technology can wrap small seeds or seeds with irregular surface through a pelletizing machine to wrap additives and powdery inert substances on the surface of the seeds, and increase the quality of the seeds without changing the biological characteristics of the original seeds. And volume, forming spherical or quasi-spherical particles with a certain size, certain strength and smooth surface. Coated seeds can not only realize mechanized sowing, but also improve the uniformity of sowing, realize precise sowing and improve the germination rate and uniformity of seed emergence, and also have the advantages of saving seeds, labor, fertilizer, medicine, production and expenditure. advantage.

In the links of storage, handling and operation, due to the impact of collision, extrusion and friction, the coated seeds with incomplete pelletization and poor pelletization quality are prone to cracking or breaking. One of the important indicators in the quality inspection of coated seeds. At present, there is no feasible, accurate and automated method for measuring the compressive strength of coated seeds. The commonly used method is to place a batch of sample coated seeds with a set number of grains between two transparent glass plates. Add weights on the upper glass plate, observe the cracking timing of the coated seeds by manual observation, and calculate the compressive strength value of this batch of coated seeds according to the weights added when cracking.

Obviously, the existing method for measuring the compressive strength of coated seeds has low detection efficiency and accuracy, and is labor-intensive. Therefore, it is urgent to provide a method that can accurately and automatically measure the compressive strength of coated seeds.

Contents of the invention

The invention provides a method, device and system for measuring the compressive strength of coated seeds to solve the technical problems of low efficiency and low accuracy in measuring the compressive strength of coated seeds in the prior art.

To achieve the above object, the invention provides a method for measuring the compressive strength of coated seeds, comprising:

Collect the real-time pressure on the coated seeds;

monitoring the real-time pressure change to obtain a real-time pressure drop difference;

According to the real-time pressure drop difference, the compressive strength value of the coated seeds is calculated.

The present invention also provides a device for measuring the compressive strength of coated seeds, comprising:

The pressure collection module is used to collect the real-time pressure on the coated seeds;

An identification module, configured to monitor the real-time pressure change and obtain a real-time pressure drop difference;

The calculation module is used to calculate the compressive strength value of the coated seeds according to the real-time pressure drop difference.

In addition, the present invention also provides a system for measuring the compressive strength of coated seeds, including a test bench and a controller, wherein the controller includes the device for measuring the compressive strength of coated seeds provided by the present invention; The measurement test bench includes a base unit, a test unit, a mobile unit and a pressure unit;

The base unit includes a base, a vertical plate and an extension arm, the vertical plate is arranged on the side of the base, one end of the extension arm is connected to the upper end of the vertical plate, and the extension arm is suspended above the base horizontally ;

The test unit includes a discharge dish, a test stand and a pressure sensor, the discharge dish is arranged on the test stand for placing the tested coated seeds, and the pressure sensor is fixedly arranged between the test stand and the test stand. Between the bases, the pressure sensor sends the collected pressure information to the controller;

The mobile unit includes a slide rail fixing plate, a slide rail and a mobile platform, the slide rail fixing plate is fixedly connected to the extension arm, the slide rail is arranged on the slide rail fixing plate and is perpendicular to the test bench , the mobile platform is slid on the slide rail;

The pressing unit includes a pressing arm and a pressing platform, the pressing arm is fixed on the moving platform, the pressing platform is fixedly connected to the lower end of the pressing arm, and is arranged on the side of the discharging dish. Directly above, the pressure applying unit moves up and down in the vertical direction along with the moving platform to continuously apply pressure to the coated seeds in the discharging dish.

The method, device and system for measuring the compressive strength of coated seeds provided by the invention solve the problems of low accuracy and low automation of the detection of the compressive strength of coated seeds, not only improve the detection accuracy, improve the detection efficiency, and operate Simple and reduce manpower input.

Description of drawings

Fig. 1 is the flow chart of the method for measuring the compressive strength of coated seeds provided by the embodiment of the present invention;

Fig. 2 is the flowchart of step 102 in the method for measuring the compressive strength of coated seeds provided by the embodiment of the present invention;

Fig. 3 is the flowchart of step 103 in the method for measuring the compressive strength of coated seeds provided by the embodiment of the present invention;

Figure 4 is a schematic structural view of a device for measuring compressive strength provided by an embodiment of the present invention;

Fig. 5 is the front view of the system for measuring the compressive strength of coated seeds provided by the embodiment of the present invention;

Fig. 6 is the left side view of the system that the coated seed compressive strength measurement shown in Fig. 5;

Fig. 7 is a top view of the system for measuring the compressive strength of the coated seeds shown in Fig. 5 .

Reference signs:

1-base; 2-pressure sensor; 3-test bench;

4-Discharging dish; 5-Fiber optic sensor fixed block; 6-Fiber optic sensor;

7-pressing platform; 8-pressing arm; 9-moving platform;

10- slide rail; 11-motor; 12-serial port;

13-motor fixing plate; 14-rail fixing plate; 15-upper limit switch;

16-Trigger block; 17-Lower limit switch; 18-Extension arm;

19-vertical plate; 20-coupling; 21-screw;

22-screw fixing block; 23-bolt.

Detailed ways

Fig. 1 is a flow chart of the method for measuring the compressive strength of coated seeds provided by the embodiment of the present invention. As shown in Figure 1, the method of the present embodiment includes:

Step 101, collect the real-time pressure on the coated seeds.

Specifically, the pressure that the coated seeds are subjected to is the pressure that a plurality of tested steamed stuffed bun seeds bear after being evenly pressed, and the real-time pressure that the collected coated seeds bear can be collected in real time by a pressure sensor, and then processed by a signal conditioning module. The digital signal obtained after conversion, filtering and amplification.

Step 102, monitor the real-time pressure change, and obtain the real-time pressure drop difference.

Specifically, when the real-time pressure collected in step 101 drops, the real-time pressure drop difference is calculated in real time. In the measurement process, the coated seeds are subjected to continuous pressure, and the change of real-time pressure reflects the change of the coating state of the coated seeds. If the real-time pressure significantly reduces, it indicates that the coating of the coated seeds is cracked. Therefore, it can be passed Real-time pressure changes are monitored, and the obtained real-time pressure drop difference is used as the basis for calculating the compressive strength.

Step 103, according to the real-time pressure drop difference, calculate the compressive strength value of the coated seeds.

By comparing the real-time pressure drop difference obtained in step 102, it is judged that the moment when the coated seed reaches the maximum pressure it can bear and cracks occurs, and the real-time pressure drop difference at the cracking moment of the coated seed is calculated, thereby Obtain the compressive strength value of the coated seeds.

The method for measuring the compressive strength of the coated seeds of the present embodiment monitors the real-time pressure that the coated seeds are subjected to, obtains the real-time pressure drop difference, and calculates the compressive strength value of the coated seeds, which can significantly improve the compressive strength of the coated seeds. The efficiency and accuracy of the determination of the seed compressive strength index can reduce the manpower input.

Further, Fig. 2 is a flow chart of step 102 in the method for measuring the compressive strength of coated seeds provided by the embodiment of the present invention. As shown in Fig. 2, step 102 of the method for measuring the compressive strength of coated seeds in this embodiment is specifically include:

Step 102a: Compare the pressure value at the current moment with the pressure value at the previous moment, and set the pressure value at the previous moment as an initial pressure drop value when the pressure value at the current moment is smaller than the pressure value at the previous collection moment.

Specifically, the pressure signal collected by the sensor is converted into a real-time pressure value, and the pressure value at the current moment is compared with the pressure value at the previous moment in real time. If the pressure value at the current moment is less than the pressure value at the previous collection moment, it means that the pressure value If the drop occurs, the coating of the coated seeds may be broken. At this time, the pressure value at the previous moment is set as the initial value of the pressure drop.

Step 102b. According to the initial pressure drop value, calculate the real-time pressure drop difference.

Taking the moment of the initial pressure drop as the starting moment, the initial pressure drop value is subtracted in time series from the collected pressure values to obtain the real-time pressure drop difference.

Further, Fig. 3 is a flow chart of step 103 in the method for measuring the compressive strength of coated seeds provided by the embodiment of the present invention. As shown in Fig. 3, step 103 of the method for measuring the compressive strength of coated seeds in this embodiment is specific include:

Step 103a, comparing the real-time pressure drop difference with a calibration threshold in real time, and setting the initial pressure drop value of the real-time pressure drop difference exceeding the calibration threshold as a pressure critical value.

When the collected pressure value decreases, it indicates that the coating of the coated seeds has changed, but it does not mean that the coated seeds have reached the maximum pressure they can withstand and cracking occurs. Only when the real-time pressure drop difference exceeds the calibration threshold can it be judged The coated seeds are cracked. Therefore, compare the real-time pressure drop difference obtained in step 102 with the pressure threshold one by one. When the real-time pressure drop difference exceeds the calibration threshold, it can be determined that the coated seeds are cracked. Set this real-time The pressure drop initial value of the pressure drop difference is a pressure threshold value.

Step 103b: Divide the pressure threshold by the total number of coated seeds to obtain the compressive strength value of the coated seeds.

Since the tested coated seeds are subjected to equal pressure, the pressure critical value obtained in step 103a is divided by the total number of tested coated seeds to obtain the compressive strength value of the coated seeds.

Based on the method for measuring the compressive strength of coated seeds provided by the above-mentioned embodiments, the present invention also provides a device for measuring the compressive strength of coated seeds. A schematic structural diagram of the device is shown in FIG. 4 . The device of this embodiment includes a pressure acquisition module 51 , an identification module 52 and a calculation module 53 .

Wherein, the pressure collection module 51 is used to collect the real-time pressure that the coated seeds bear; the identification module 52 is connected with the pressure collection module 51, and is used to monitor the real-time pressure change and obtain the real-time pressure reduction difference; the calculation module 53 is connected with the pressure collection module 51. The identification module 52 is connected to calculate the compressive strength value of the coated seeds according to the real-time pressure drop difference.

Each functional module of the device in this embodiment can be used to execute the process shown in FIG. 1 provided by the above method embodiment, and its specific working principle will not be described in detail. For details, refer to the description of the above method embodiment.

The device of this embodiment monitors the real-time pressure on the collected coated seeds, obtains the real-time pressure drop difference, calculates the compressive strength value of the coated seeds, and realizes the precision and automation of the compressive strength of the coated seeds The determination not only improves the detection accuracy and detection efficiency, but also is easy to operate and liberates manpower.

Further, the recognition module 52 of this embodiment is specifically used to compare the pressure value at the current moment with the pressure value at the previous moment, and when the pressure value at the current moment is smaller than the pressure value at the previous collection moment, set the pressure at the previous moment The value is the initial value of the pressure drop; the real-time pressure drop difference is calculated according to the initial pressure drop value.

The identification module 52 is used to implement the specific implementation manner of step 102 provided by the above-mentioned method embodiment, and its specific working principle will not be described in detail, please refer to the description of the above-mentioned method embodiment for details.

Furthermore, the calculation module 53 of this embodiment is specifically used to compare the real-time pressure drop difference with the calibration threshold in real time, and set the initial pressure drop value of the real-time pressure drop difference exceeding the calibration threshold as a pressure critical value; by The pressure critical value is divided by the total grain number of the coated seeds to obtain the compressive strength value of the coated seeds.

The functional units of the calculation module 53 can be used to execute the implementation process of step 103 provided by the above method embodiment, and its specific working principle will not be described in detail, see the description of the above method embodiment for details.

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Based on the device for measuring the compressive strength of coated seeds provided in the above embodiments, the present invention also provides a system for measuring the compressive strength of coated seeds. Fig. 5 is the front view of the system for measuring the compressive strength of the coated seeds provided by the embodiment of the present invention; Fig. 6 is the left view of the system for measuring the compressive strength of the coated seeds shown in Fig. 5; Fig. 7 is the package shown in Fig. 5 Top view of the system for the determination of the compressive strength of coated seeds. As shown in FIG. 5 , FIG. 6 and FIG. 7 , the system of this embodiment includes a test bench and a controller, wherein the controller includes the device for measuring the compressive strength of coated seeds provided in any embodiment of the present invention. The test bench includes a base unit, a test unit, a mobile unit and a pressure unit.

The base unit includes a base 1, a vertical plate 19 and an extension arm 18, the vertical plate 19 is arranged on the side of the base 1, one end of the extension arm 18 is connected to the upper end of the vertical plate 19, and the extension arm is suspended above the base 1 laterally.

The test unit comprises a discharge dish 4, a test stand 3 and a pressure sensor 2. The test stand 3 can be provided with an equilateral triangle groove, and the coated seeds tested are placed in the discharge dish 4. The discharge dish 4 can be Equilateral triangular shape, the discharge dish 4 matches the equilateral triangle groove of the test bench 3 and is set on the test bench 3, the discharge dish 4 matched with the test bench 3 can be replaced for coated seeds with different particle sizes , the pressure sensor 2 is fixedly arranged between the test bench 3 and the base 1, and the pressure sensor 2 sends the collected pressure information to the controller.

The mobile unit includes a slide rail fixing plate 14, a slide rail 10 and a mobile platform 9, the slide rail fixing plate 14 is fixedly connected with the extension arm 18, the slide rail 10 is arranged on the slide rail fixing plate 14 and is perpendicular to the test bench 3, and the mobile platform 9 Slidingly arranged on the slide rail 10, the slide rail 10 is nestedly connected with the mobile platform 9.

The pressing unit includes a pressing arm 8 and a pressing platform 7, the pressing arm 8 is fixed on the mobile platform 9, the pressing platform 7 is fixedly connected with the lower end of the pressing arm 8, and is arranged directly above the discharging dish 4, and the pressing The unit moves up and down in the vertical direction with the mobile platform 9 to continuously apply pressure to the coated seeds in the discharging dish 4, and the coated seeds in the discharging dish 4 all bear the same pressure.

A signal conditioning module can also be connected between the pressure sensor 2 and the controller. The pressure sensor 2 collects the pressure on the tested coated seeds in real time, and the controller receives the pressure information after analog-to-digital conversion. The pressure information is processed by the controller, The compression strength values of the tested coated seeds were obtained after comparison and calculation.

The system for measuring the compressive strength of coated seeds provided in this example enables accurate and automatic determination of the compressive strength of coated seeds, which not only improves the detection accuracy and detection efficiency, but also is easy to operate and liberates manpower.

Further, the mobile unit also includes a motor 11 and a screw mandrel 21, one end of the screw mandrel 21 is connected to the output shaft of the motor 11, the nut of the screw mandrel 21 is arranged on the mobile platform 9, and the motor 11 is used to receive the control signal sent by the controller to drive the lead screw 21 to rotate, drive the mobile platform 9 to move on the slide rail 10 through the nut. Specifically, the motor 11 is preferably a stepping motor, the upper end of the screw rod 21 can be connected with the output shaft of the motor 11 through a coupling 20, and two screw rod fixing blocks 22 can be fixedly arranged on the slide rail fixing plate 15, and the screw rod 21 The inside of the rod fixing block 22 is provided with bearings, and the upper and lower ends of the screw rod 21 cooperate with the bearings in the two screw fixing blocks 22 respectively. The nut of the screw rod 21 is fixedly connected with the mobile platform 9, and the motor 11 drives the screw rod 21 to rotate. , the mobile platform 9 is driven to move on the slide rail 10 through the nut of the lead screw 21 . In addition, the motor 11 is not limited to a stepping motor, and a motor capable of outputting linear motion can also be selected.

The motor driver of the motor 11 is connected with the controller through the serial port 12, and is used to receive the motor control signal sent by the controller, so as to drive the mobile platform 9 to move along the slide rail 11, and then realize the packing of the pressure platform 7 to the discharge container 4. Coated seeds apply constant pressure.

Furthermore, the pressure applying unit also includes an optical fiber sensor 6, which is symmetrically fixed on both sides of the pressure applying platform 7 through two optical fiber sensor fixing blocks 5. After the optical fiber sensor 6 senses the coated seeds, the controller receives the signal The trigger signal processed by the conditioning module is used to make the controller control the motor 11 to decelerate.

The motor 11 is controlled to rotate at a slow speed by the optical fiber sensor 6 to ensure that the pressure application platform 7 flexibly touches the coated seeds to be tested, so that the coated seeds to be tested can obtain a more uniform pressure application process.

Still further, a plurality of depressions for placing coated seeds are evenly distributed in the discharging dish 4 . Preferably, a flat-bottomed groove is respectively arranged on the three corners of the discharging dish 4, and the line connecting the three flat-bottomed grooves is an equilateral triangle. The coated seeds can be evenly stressed, and the discharging dishes 4 with flat-bottomed grooves of different sizes can be made for the coated seeds of different particle sizes.

In addition, the determination test bench can also include a limit unit for controlling the stroke of the mobile platform 9. The limit unit includes an upper limit switch 15, a trigger block 16 and a lower limit switch 17, wherein the upper limit switch 15 and the lower limit switch 17 are up and down. The trigger block 16 is arranged on the side of the mobile platform 9 and is located between the upper limit switch 15 and the lower limit switch 17 at intervals on the side of the slide rail fixing plate 14 .

The upper limit switch 15 and the lower limit switch 17 are connected with the controller through the serial port 12, and the trigger block 16 is used for sensing the upper limit switch 15 or the lower limit switch 17, and the controller receives the trigger signal to control the mobile platform 9 to stop moving and prevent the motor 11 from Overload, the motor 11 is protected to work within the safe range of movement.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (11)

1. A method for measuring the compressive strength of coated seeds, is characterized in that, comprising: Collect the real-time pressure on the coated seeds; monitoring the real-time pressure change to obtain a real-time pressure drop difference; According to the real-time pressure drop difference, the compressive strength value of the coated seeds is calculated. 2. the method for measuring the compressive strength of coated seeds according to claim 1, is characterized in that, described monitoring described real-time pressure variation, obtaining real-time pressure and reducing difference comprises: Comparing the pressure value at the current moment with the pressure value at the previous moment, when the pressure value at the current moment is less than the pressure value at the previous collection moment, setting the pressure value at the previous moment as the initial value of pressure reduction; The real-time pressure drop difference is calculated according to the initial pressure drop value. 3. the method for measuring the compressive strength of coated seeds according to claim 1, is characterized in that, according to the real-time pressure drop difference, calculating the compressive strength value of described coated seeds comprises: Comparing the real-time pressure drop difference with a calibration threshold in real time, and setting the initial pressure drop of the real-time pressure drop difference exceeding the calibration threshold as a pressure critical value; The compressive strength value of the coated seeds is obtained by dividing the pressure critical value by the total number of coated seeds. 4. A device for measuring the compressive strength of coated seeds, characterized in that it comprises: The pressure collection module is used to collect the real-time pressure on the coated seeds; An identification module, configured to monitor the real-time pressure change and obtain a real-time pressure drop difference; The calculation module is used to calculate the compressive strength value of the coated seeds according to the real-time pressure drop difference. 5. The device for measuring the compressive strength of coated seeds according to claim 4, is characterized in that, the identification module is specifically used for: Comparing the pressure value at the current moment with the pressure value at the previous moment, when the pressure value at the current moment is less than the pressure value at the previous collection moment, setting the pressure value at the previous moment as the initial value of pressure reduction; The real-time pressure drop difference is calculated according to the initial pressure drop value. 6. The device for measuring the compressive strength of coated seeds according to claim 4, is characterized in that, the calculation module is specifically used for: Comparing the real-time pressure drop difference with a calibration threshold in real time, and setting the initial pressure drop of the real-time pressure drop difference exceeding the calibration threshold as a pressure critical value; The compressive strength value of the coated seeds is obtained by dividing the pressure critical value by the total number of coated seeds. 7. A system for measuring the compressive strength of coated seeds is characterized in that it comprises a measuring bench and a controller, and the controller includes the device for measuring the compressive strength of coated seeds described in any one of claims 4-6 ; The determination test bench includes a base unit, a test unit, a mobile unit and a pressure unit; The base unit includes a base, a vertical plate and an extension arm, the vertical plate is arranged on the side of the base, one end of the extension arm is connected to the upper end of the vertical plate, and the extension arm is suspended above the base horizontally ; The test unit includes a discharge dish, a test stand and a pressure sensor, the discharge dish is arranged on the test stand for placing the tested coated seeds, and the pressure sensor is fixedly arranged between the test stand and the test stand. Between the bases, the pressure sensor sends the collected pressure information to the controller; The mobile unit includes a slide rail fixing plate, a slide rail and a mobile platform, the slide rail fixing plate is fixedly connected to the extension arm, the slide rail is arranged on the slide rail fixing plate and is perpendicular to the test bench , the mobile platform is slid on the slide rail; The pressing unit includes a pressing arm and a pressing platform, the pressing arm is fixed on the moving platform, the pressing platform is fixedly connected to the lower end of the pressing arm, and is arranged on the side of the discharging dish. Directly above, the pressure applying unit moves up and down in the vertical direction along with the moving platform to continuously apply pressure to the coated seeds in the discharging dish. 8. The system for measuring the compressive strength of coated seeds according to claim 7, wherein the mobile unit also includes a motor and a screw mandrel, one end of the screw mandrel is connected with the output shaft of the motor, and the wire mandrel The nut of the rod is arranged on the moving platform, the motor is used to receive the control signal sent by the controller to drive the lead screw to rotate, and the moving platform is driven to move on the slide rail through the nut. 9. The system for measuring the compressive strength of coated seeds according to claim 8, wherein the pressure-applying unit also includes an optical fiber sensor, and the optical fiber sensor is fixedly arranged at both ends of the pressure-applying platform. After sensing the coated seeds, the optical fiber sensor sends a trigger signal to the controller, so that the controller controls the motor to decelerate. 10 . The system for measuring the compressive strength of coated seeds according to any one of claims 7 to 9 , characterized in that, a plurality of depressions for placing the coated seeds are evenly distributed in the discharge dish. 11 . 11. The system for measuring the quality of coated seeds according to any one of claims 7 to 9, further comprising a limiting unit for controlling the stroke of the mobile platform; The limit unit includes an upper limit switch, a trigger block and a lower limit switch; the upper limit switch and the lower limit switch are arranged at intervals up and down on the side of the slide rail fixing plate, and the trigger block is arranged on the side of the mobile platform and Located between the upper limit switch and the lower limit switch; The trigger block is used to sense the upper limit switch or the lower limit switch, and send a trigger signal to the controller to control the mobile platform to stop moving.

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