KR20070035534A - Fruit grader for detecting internal defect of watermelon - Google Patents

Abstract

The present invention relates to a watermelon defect determination device that can effectively determine the individual quality rating of the individual watermelon by using a blow device and a sound signal device using a solenoid while preventing damage to the watermelon.

The present invention is a frame in which the support plate is formed on the lower bottom portion in the form of a square frame, a conveyance belt for transporting and transporting the tray on which watermelon is placed, and both ends are curved and lifted by a single-axis robot, and a support connected with a wire and a balance balance Is installed on one end of the support by the bracket, the striking rod is moved forward and backward by the solenoid, the striking part is configured to adjust the striking position by the step motor and timing belt, and is installed on the other end of the support by the bracket The first, second and third acoustic sensors for measuring the sound generated by the combination is moved forward and backward by the step motor and the timing belt, and consists of a multi-acoustic measurement unit that adjusts the sound signal measuring distance, the striking unit is a solenoid The striking rod is configured to be moved forward and backward and the striking position is adjusted by the step motor and the timing belt. Configuring the multi-sound measuring unit group first, second, and third acoustic sensor and is configured such that before, the backward acoustic signal measured distance is adjusted by the stepper motor and timing belt.

Watermelon, Strike, Strike Rod, Acoustic Sensor, Multi-Acoustic Measurement Unit

Description

Fruit grader for detecting internal defect of watermelon

1 is a perspective view showing a watermelon defect determining apparatus according to the present invention,

2 to 4 is a perspective view of the main portion of the watermelon defect determination apparatus according to the present invention,

5 is a striking device control circuit diagram of the watermelon defect determining apparatus according to the present invention,

6 is a circuit diagram of a solenoid hitting strength of a watermelon defect determining apparatus according to the present invention;

7 is an acoustic signal amplifying circuit diagram of the watermelon defect determining apparatus according to the present invention;

8 is a graph showing an acoustic signal generated when a watermelon strikes the watermelon defect determining apparatus according to the present invention;

9 is a graph showing signals measured by three acoustic sensors after the watermelon hit of the watermelon defect determining apparatus according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: judgment device 2: frame

3: support plate 4: conveying belt

5: tray 10: support

12: 1 axis robot 14: wire

16: Counterweight 20: Strike

22: solenoid 24: blow rod

26,36: step motor 28,38: timing belt

30: multiple acoustic measurement unit

The present invention relates to a watermelon defect determination apparatus, and more particularly, to prevent damage to the harvested watermelon, watermelon defect determination apparatus that can effectively determine the individual classification by using the striking device and the acoustic signal device using the solenoid It is about.

In general, the internal quality such as the watermelon's cavities, immature, blood watermelon, etc., is determined by listening to the sound produced by a skilled expert.

These experts empirically judge the internal quality from the subtle differences in sound produced by tapping watermelons, but it is very difficult and inaccurate for the average person or non-expert to judge the internal quality with the sound produced by tapping watermelons.

In addition, even in the case of professionals, in the harsh environment due to the accumulation of fatigue, poor health, ambient noise, it is often difficult to make an accurate internal judgment due to error in sound judgment.

In particular, it takes about 7 seconds or more to determine the internal quality of watermelon through manual work by an expert, so the workability is poor, and in the case of continuous and repeated work, fatigue is difficult to sustain and it is difficult to select a large amount of watermelon. It is not suitable.

At present, watermelon has a lot of weight per piece and requires a lot of manpower for sorting by class and grade for getting on and off for production and sale. have.

The present invention is to solve the conventional problems as described above, the purpose is to automatically hit the watermelon to measure the internal quality by the solenoid method, and measure by measuring the acoustic signal generated at the time of a plurality of acoustic sensors It is an object of the present invention to provide a new type of watermelon defect determination device capable of automatically analyzing the data values and determining the internal quality.

Another object of the present invention is to automatically analyze by hitting the solenoid method and the acoustic signal generated by the hitting by the acoustic sensor, so that accurate and accurate internal quality measurement of the maximum 1440 watermelon per hour in the shortest time It is intended to improve workability and productivity by enabling processing.

In order to achieve the above object, the present invention is a frame in which the support plate is formed on the lower bottom portion in the form of a square frame, a conveyance belt for transporting and transporting the tray on which watermelon is placed, and both ends are formed to be curved and descended by a single axis robot. And a striking portion which is installed at one end of the scaffold by a bracket and a wire and a balance weight, the striking rod is moved forward and backward by a solenoid, and the striking position is controlled by a step motor and a timing belt. The first, second and third acoustic sensors which are installed at the other end of the support by the bracket and measure the sound generated by the striking rod are coupled, and are moved forward and backward by the step motor and timing belt, and the acoustic signal measuring distance is adjusted. It is made with a multi-acoustic measurement, the striking portion is configured so that the striking rod forward and backward by the solenoid The hitting position is adjusted by the stepper motor and the timing belt, and the multi-acoustic measuring part is configured with first, second, and third acoustic sensors, and is configured to adjust the acoustic signal measuring distance by moving forward and backward by the stepper motor and the timing belt. Has characteristics.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

As shown in Figures 1 to 4, the frame 2 of the watermelon defect determination apparatus 1 of the present invention is a support plate (3) is formed on the lower bottom portion in the form of a rectangular frame, the conveying belt 4 is a support plate ( 3) is installed so as to transport and transport the tray (5) on which the watermelon is placed, and the support (10) is formed by both ends of the curvature is raised and lowered by the uniaxial robot 12, the wire 14 And counterweight (16) is configured to be connected.

The striking portion 20 is installed at one end of the support 10 by a bracket, and the striking rod 24 is moved forward and backward by the solenoid 22, and the step motor 26 and the timing belt 28 The hitting position is adjusted by).

The multi-acoustic measuring unit 30 is installed on the other end of the support 10 by a bracket, the first, second, third acoustic sensors 32a, 32b, 32c for measuring the sound generated by the striking rod 24 Is coupled, and moved forward and backward by the step motor 36 and the timing belt 38, the sound signal measuring distance is to be adjusted.

At this time, the striking unit 20 and the multi-acoustic measurement unit 30 is connected to the timing belts 28 and 38 which are circulated in a predetermined area by the step motors 26 and 36 and are positioned within a predetermined area when rotating. While moving, it is placed on the tray (5) and the blow distance and the acoustic measurement distance with the watermelon transported and supplied by the transfer belt (4) is adjusted.

5 is a striking device control circuit diagram of the watermelon defect determination device according to the present invention, the operation time adjustment (0.1 ~ 1sec) of the solenoid 22 of the striking device (1): 0.1s, the delay time adjustment before the solenoid operation (0 ~ 3sec ): Less than 0.1 s.

6 is a circuit diagram of a solenoid striking strength of the watermelon defect determining apparatus according to the present invention, wherein the striking strength of the solenoid 22 of the striking section 20 is 12 to 20 V: 20 V. FIG.

7 is an acoustic signal amplification circuit diagram of the watermelon defect determining apparatus according to the present invention, in which the first, second and third acoustic sensors 32a, 32b and 32c amplify the acoustic signals generated by the striking device 1. .

FIG. 8 is a graph illustrating an acoustic signal generated when a watermelon defect is determined by a watermelon defect determining apparatus according to the present invention, wherein the first peak position of the time domain signal, the magnitude difference between the first peak and the second peak, and the interval of the time domain signal It represents the energy, the total energy of the power spectrum, and the resonant frequencies (f1, f2, f3) and magnitude of the power spectrum.

9 is a graph showing signals measured by three acoustic sensors after the watermelon hit of the watermelon defect determining apparatus according to the present invention.

According to the present invention, when the watermelon placed on the tray 5 is transferred to the center of the defect determining apparatus 1 by using the conveying belt 4, the batting rod 24 of the hitting part 20 is multiplied in the center of the equator of the watermelon. The acoustic measurement unit 30 is placed in close contact with the surface of the watermelon.

The striking unit 20 and the multi-acoustic measuring unit 30 is fixed to the support 10, the support 10 is to move up and down by the one-axis robot 12.

In addition, in order to smooth the vertical movement of the support 10 and the 1-axis robot 12, the balance weight 16 was connected to the support 10 by the wire 14 to balance the force.

The device for beating watermelon, ie the striking device, must not be too weak, strong enough to destroy the watermelon, and must be able to strike the watermelon at the right level with the same force at all times.

At the end of the electronic solenoid 22 has a striking rod 24 capable of striking the watermelon, the control of which is slightly delayed when a trigger signal for striking the outside is input to the striking device control circuit (see FIG. 5). After passing the time, the solenoid 22 operates to hit the watermelon for a set time.

The operation time of the solenoid 22 is a time for supplying a current, which is related to securing the minimum hitting force required. If the operation time of the solenoid 22 is long, the operation time of the solenoid 22 is in close contact with the watermelon, but if the operation time of the solenoid 22 is very short, it does not operate completely. I can't finish it. That is, it does not reach the striking force to make a sound.

Therefore, an operation time for obtaining a minimum hitting force is required, and a time of 0.1 second is appropriate.

Measurement of the sound generated after hitting the watermelon is made in the acoustic sensors (32a, 32b, 32c) located on the opposite side, and is attached in the acoustic sensor support to maintain a proper distance from the watermelon.

In order to improve the contact between the first, second, and third acoustic sensors 32a, 32b, and 32c and the watermelon, the timing belt 38 driven by the step motor 36 is used to make it as close to the watermelon as possible.

After hitting the watermelon, after extracting a number of feature points from the acoustic signal (see Fig. 8) measured by one second sound sensor (32b) and correlation analysis with the internal quality data, statistics for predicting the internal quality index After developing the conventional model, the developed model is input to the quality determination computer in advance, and when the acoustic signal is input to the unknown sample, the feature points are extracted and input into the model to determine the internal quality.

Here, using the acoustic signals measured by the three acoustic sensors 32a, 32b, and 32c (see FIG. 9) rather than measuring by one acoustic sensor can improve the determination accuracy.

In the present invention, the mechanical friction of the sorting transfer line installed in the agricultural product distribution center, the sound of the discharge part pneumatic solenoid, the noise caused by the operator and the vehicle in and out, etc. can be excluded in order to reduce the other external noise as much as possible.

As described above, according to the watermelon defect determining apparatus according to the present invention, since the acoustic signal caused by the sound of watermelon hitting can be simultaneously measured in several places, the internal quality of the cavity, the watermelon, etc. can be determined. The internal quality of the watermelon being transferred can be objectively determined, and the internal quality of the watermelon can be determined precisely and the quality can be standardized, so as to improve the consumer's watermelon reliability, export of citrus fruits, and improve farm household income. To achieve an efficient and economical effect that can contribute to

Claims (1)

A frame 2 having a support plate 3 formed on the lower bottom portion in the form of a square frame, a conveying belt 4 for transporting and conveying a tray 5 on which watermelon is placed, and both ends are formed to be curved, and a single-axis robot 12 Supported by the bracket, the support 10 is connected to the wire 14 and the counterweight 16, the striking portion 20 installed at one end of the support 10 by the bracket, and the support by the bracket. Is installed in the other end of the (10) and consists of a multi-acoustic measurement unit 30 for measuring the sound generated by the striking unit 20, The striking portion 20 is configured such that the striking rod 24 is moved forward and backward by the solenoid 22, the striking position is adjusted by the step motor 26 and the timing belt 28, The multi-acoustic measuring unit 30 is composed of first, second, third acoustic sensors 32a, 32b, 32c, and is moved forward and backward by the step motor 36 and the timing belt 38 to measure the acoustic signal measurement distance. Watermelon defect determination apparatus, characterized in that is made to be adjusted.

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