Novel poultry egg crack detection device

Abstract

A novel poultry egg crack detection device comprises a shell, a conveying device is installed on the shell, and a knocking detection mechanism is arranged above the conveying device; the conveying device comprises a double-row-chain conveying mechanism which is driven by a speed adjusting motor to rotate. Transmission rods are rotatably installed between transmission chains of the double-row-chain conveying mechanism at intervals in the conveying direction, and egg holders are installed in the middles of the transmission rods. The multiple sets of knocking detection mechanisms are operated in a time-sharing mode, and the interval time of the adjacent knocking actions is larger than the sound wave attenuation time. According to the novel poultry egg crack detection device provided by the utility model, the detection precision of the existing poultry eggs can be improved.

Description

Technical Field

[0001] This utility model relates to the field of detecting cracks in poultry eggs, and in particular to a novel device for detecting cracks in poultry eggs. Background Technology

[0002] Acoustic testing technology is based on the propagation characteristics of sound in different media. When poultry eggs are tapped, intact eggs and cracked eggs produce different sound signals due to their different external structures and physical properties. Intact eggs have a uniform external structure, and their sound signals are relatively regular and stable; while cracked eggs cause scattering and reflection during sound propagation, resulting in changes in the frequency, amplitude, and other waveform characteristics of the sound signal.

[0003] By accurately analyzing acoustic signals, minute cracks and internal cracks can be precisely identified, overcoming the shortcomings of manual inspection and some traditional inspection methods, and improving the accuracy and reliability of inspection.

[0004] Existing methods for detecting cracks in poultry eggs mainly fall into three categories: manual inspection, optical inspection, and acoustic inspection. Manual visual inspection or random sampling suffers from low screening efficiency and high rates of missed or false detections. Prolonged operation can lead to visual fatigue, further reducing accuracy and failing to meet the high quality control standards required by large-scale production lines. Optical inspection is affected by eggshell surface stains, lighting conditions, and texture interference, resulting in insufficient accuracy in identifying minute cracks (especially shallow cracks) and a high risk of misjudgment. Acoustic inspection requires precise control of the force and position of the tapping vibration; if the tapping point deviates from the crack area, the signal characteristics will resemble those of a normal egg, leading to detection failure. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a novel poultry egg crack detection device. It has the advantages of collecting sound signals by tapping the poultry egg with a tapping head group and using a poultry egg crack recognition algorithm to determine whether the poultry egg has cracks. It solves the technical problem that it is inconvenient to detect cracked eggs during poultry egg production and improves the accuracy of existing poultry egg detection.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A novel poultry egg crack detection device includes a housing, a conveying device mounted on the housing, and a knocking detection mechanism arranged above the conveying device.

[0008] The conveying device includes a double-row chain conveying mechanism, which is driven to rotate by a speed-regulating motor; the transmission chains of the double-row chain conveying mechanism are spaced apart along the conveying direction and rotatably mounted with transmission rods, and an egg holder is installed in the middle of the transmission rods.

[0009] The impact detection mechanism consists of multiple groups, which operate in shifts, and the interval between adjacent impact actions is greater than the sound wave attenuation time.

[0010] The egg holder is equipped with transmission gears at both ends, and the transmission gears mesh with the rack below.

[0011] The housing includes a bottom frame, a protective shell in the middle of the bottom frame, and an inlet / outlet baffle installed at the output end of the bottom frame.

[0012] The egg holder is wheel-shaped, thinner in the middle and thicker at both ends, with a smooth transition, and the distance between adjacent egg holders is smaller than the diameter of the egg.

[0013] The egg holder is made of food-grade silicone.

[0014] The tapping detection mechanism is installed on the inside of the bottom frame by a fixed bracket and is symmetrically distributed on the left and right sides above the egg holder.

[0015] The tapping detection mechanism includes a base, on which a tapping head is hinged. The tapping head is attracted to or detached from an electromagnet on the base.

[0016] This utility model provides a novel device for detecting cracks in poultry eggs, which has the following technical advantages:

[0017] 1) By setting up a double-row chain conveyor mechanism, multiple rotatable transmission rods are installed along the length of the double-row chain conveyor mechanism. Egg holders are arranged on the transmission rods. Adjacent egg holders can support the poultry eggs and move them forward at the same time. At the same time, since transmission gears are arranged on the transmission rods, the transmission gears mesh with the racks fixedly installed below. The transmission gears not only take into account the balanced load-bearing and reduce vibration, but also enable the poultry eggs to roll forward, which is convenient for tapping and testing from different positions and ensures comprehensiveness (in this application, tapping is achieved at both ends, four directions each, for a total of eight points, which effectively improves the comprehensiveness and accuracy of the test).

[0018] 2) This testing platform uses a high-precision tapping head assembly. Since this testing platform needs to tap 8 parts simultaneously, it is necessary to avoid mutual interference as much as possible to avoid errors (the tapping device is operated in a time-division manner to ensure that the interval between each tapping action is greater than the sound wave decay time). This makes the device convenient for testing eggs with cracks, which is convenient for users.

[0019] 3) Adaptable to eggs of different sizes: The conveyor belt speed remains constant, while the size of the egg affects its rotation speed on the conveyor belt. Taking duck eggs as an example, smaller ones have a diameter of around 40mm, while larger ones can reach over 60mm. Therefore, to achieve even distribution of striking points, it is necessary to grade the eggs by weight, calculate their diameter, and combine this with the conveyor belt speed to calculate the number of striking heads required. These heads should then be activated sequentially to achieve uniform striking of the eggshell surface, thus adapting to eggs of different sizes. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 This is a schematic diagram of the installation structure of this utility model (protective shell open).

[0022] Figure 2 This is a schematic diagram of the installation structure of this utility model (protective shell closed).

[0023] Figure 3 This is a schematic diagram (front view) showing the arrangement of the impact detection mechanism and conveying device of this utility model.

[0024] Figure 4 This is a schematic diagram (top view) showing the arrangement of the impact detection mechanism and conveying device of this utility model.

[0025] Figure 5 This is a schematic diagram (left view) showing the arrangement of the impact detection mechanism and conveying device of this utility model.

[0026] Figure 6 This is a schematic diagram of the impact detection mechanism and conveying device of this utility model.

[0027] In the diagram: 1. Shell; 2. Conveying device; 3. Knocking detection mechanism; 4. Egg; 1.1. Inlet / outlet baffle; 1.2. Bottom frame; 1.3. Protective shell; 2.1. Double-row chain conveyor mechanism; 2.2. Speed-regulating motor; 2.3. Support plate; 2.4. Transmission rod; 2.5. Egg holder; 2.6. Transmission gear; 2.7. Rack and pinion. Detailed Implementation

[0028] like Figure 1-4 As shown, a poultry egg intelligent detection platform includes a shell 1, a conveying device 2 installed on the shell 1, and a knocking detection mechanism 3 installed on the conveying device 2.

[0029] The housing 1 includes a bottom frame 1.2, with a protective shell 1.3 in the middle of the bottom frame 1.2, and an inlet / outlet baffle 1.1 installed at the output end of the bottom frame 1.2. The benefits of setting the inlet / outlet baffle 1.1 are: to prevent poultry eggs from rolling off and being damaged, and to improve the stability of poultry egg input during the sorting process.

[0030] The conveying device 2 includes a double-row chain conveyor mechanism 2.1. The sprockets of the double-row chain conveyor mechanism 2.1 are driven by a speed-regulating motor 2.2, which is mounted on a support plate 2.3. Drive rods 2.4 are installed at intervals along the conveying direction between the drive chains of the double-row chain conveyor mechanism 2.1. The drive rods 2.4 are coaxial with the pins of the two drive chains and are rotatable. An egg holder 2.5 is arranged in the middle of the drive rod 2.4, and the eggs 4 are located between two adjacent egg holders 2.5 and supported by them. A drive gear 2.6 is fixedly installed on the drive rod 2.4 outside the egg holder 2.5. The drive gear 2.6 can be symmetrically arranged on the left and right sides outside the egg holder 2.5 or arranged on one side. The lower end of the drive gear 2.6 meshes with a rack 2.7. During the forward conveying process of the drive chain, the drive gear 2.6 rolls forward along the rack 2.7, causing the drive rods 2.4 and the egg holders 2.5 to rotate, thereby driving the eggs 4 to rotate.

[0031] The transmission gear 2.6 and the rack 2.7 work together to provide some support; at the same time, they enable the egg holder 2.5 to rotate while moving forward, so that the eggs 4 can roll forward and be easily detected.

[0032] When the detection platform starts running and the speed-regulating motor 2.2 starts, the output shaft of the speed-regulating motor 2.2 is connected to the main shaft, thereby driving the sprocket. The sprocket and the transmission chain work together to drive the transmission rod 2.4 and the egg holder 2.5 to move forward. At the same time, the transmission gears 2.6 at both ends of the transmission rod 2.4 will roll forward on the rack 2.7. During the rotation of the egg holder 2.5, the eggs 4 will roll forward.

[0033] The egg holder 2.5 is wheel-shaped, tapering in the middle and thickening at both ends with a smooth transition. It is made of food-grade silicone, which has a high coefficient of friction and is elastic. The spacing between adjacent egg holders 2.5 is appropriate for supporting the eggs.

[0034] The tapping detection mechanism 3 consists of 8 groups. The 8 groups of tapping detection mechanisms 3 are installed on the inner side of the outer frame by fixed brackets. The 8 groups of tapping detection mechanisms 3 are arranged side by side above the egg carrier 2.5 and distributed in two mirror-symmetrical groups in front and behind.

[0035] The 8-group knocking detection mechanism 3 employs a stepped trigger delay, based on the conveyor belt linear speed v (unit: m / s) and the distance d between adjacent eggs (unit: m), to calculate the time interval Δt = d / (2v). For example, when v = 0.1 m / s and d = 0.15 m, Δt = 0.75 s, ensuring that the knocking signal of the previous group attenuates to the background noise level (≤40 dB) before triggering the next group.

[0036] Each set of striking detection mechanisms 3 has the same striking head structure as the one in the patent application "202321746094.8" entitled "Control Board for a Striking Head for Detecting Cracks in Poultry Eggs":

[0037] 1) Design Goals:

[0038] The striking device needs to have sufficient striking force; it should be quiet enough during activation to avoid affecting the acquisition of the striking signal; and it should be able to control activation and reset to ensure the smoothness of the striking action.

[0039] 2) Structural Design

[0040] To meet the design objectives, this paper proposes an electromagnetic striking device, the structure of which consists of the following three parts:

[0041] A. The actuator, with its base hinged to the striking rod, performs the main motion;

[0042] B. Reset device: The tail end of the base is connected to the striking rod via a resettable rotating shaft consisting of a pin sleeve, bearing, and torsion spring.

[0043] C. Electromagnetic excitation device, with a permanent magnet in the middle of the striking head, corresponding to the position of the electromagnet in the middle of the base, with a sound-absorbing cotton pad sandwiched between them;

[0044] 3) Structural composition

[0045] The main body of the striking device includes a base, an electromagnet, a sound-absorbing cotton pad, a permanent magnet, a silicone sleeve, an iron core, a rotating body, a pin, a sleeve, a bearing, a torsion spring, and a pin nut.

[0046] 4) Structural features

[0047] To generate a striking force whose magnitude and excitation-reset time are controllable, an electromagnet is used as the source of the striking force.

[0048] By adjusting the current and the number of windings, the theoretically required striking force can be achieved, which is approximately 8.7 N

[43] ;

[0049] The excitation and reset time of the electromagnet is controlled by controlling the circuit time; a sound-absorbing cotton pad is installed at the electromagnet's attraction point, and a bearing is installed at the hinge point to reduce the vibration and noise generated by friction.

[0050] The array of striking devices is uniformly scheduled and activated by the Mega 2560Pro chip.

[0051] When egg 4 reaches the designated position, the electromagnet of the striking head (made of silicone) is momentarily energized, generating a magnetic field. At this time, the striking head (iron core) moves rapidly downward due to the electromagnetic force, striking the eggshell of egg 4. After striking, the electromagnet is de-energized, the magnetic field disappears, and because a torsion spring is installed in the striking head, the striking head lifts up as the torsion spring resets, ready for the next strike.

[0052] After each tap, the egg moves to the next tapping position and rotates simultaneously. It rotates 1 / 4 turn after each tapping position, thus achieving multi-angle tapping of egg 4 and comprehensively checking for cracks in egg 4.

[0053] In addition, this device is equipped with eight acoustic signal sensors, specifically the Hengkai data acquisition card audio module sensor. These sensors are positioned 10mm away from the eggs. The striking head assembly strikes the eggs, generating sound. The acoustic signal is collected by the acoustic signal sensors and converted into a voltage signal by the NI-USB6009 data acquisition card. The signal waveform can be displayed in real-time on LabVIEW software, and window functions can be used to extract the desired striking waveform. LabVIEW supports filtering, time-frequency domain analysis, Fourier transform, and correlation analysis of the collected acoustic signals. It also supports waveform playback of a specific egg signal. Finally, the waveform is compared with the egg waveform previously extracted and trained using machine learning algorithms to determine the quality of the egg.

[0054] This device uses an NI-USB6009 sound card, located next to the microcontroller. As a hardware device for processing audio signals, the sound card is responsible not only for processing the received audio signals but also for amplifying them and performing analog-to-digital conversion (AD conversion). During the testing process, a pre-compiled program using Keil needs to be imported. The computer connects to the sound card via a USB interface to receive audio signals. Furthermore, the computer can work with multiple sound cards simultaneously, thus supporting the simultaneous acquisition of multi-channel audio signals.

Claims

1. A novel poultry egg crack detection device, characterized in that: Includes a housing (1), a conveying device (2) is installed on the housing (1), and a knocking detection mechanism (3) is arranged above the conveying device (2); The conveying device (2) includes a double-row chain conveying mechanism (2.1), which is driven to rotate by a speed-regulating motor (2.2); the transmission chains of the double-row chain conveying mechanism (2.1) are spaced apart along the conveying direction and rotatably equipped with transmission rods (2.4), and an egg holder (2.5) is installed in the middle of the transmission rods (2.4). The knocking detection mechanism (3) consists of multiple groups, and the multiple groups of knocking detection mechanisms (3) operate at time intervals, with the interval between adjacent knocking actions being greater than the sound wave attenuation time.

2. The novel poultry egg crack detection device according to claim 1, characterized in that: The egg holder (2.5) is equipped with transmission gears (2.6) at both ends, and the transmission gears (2.6) mesh with the rack (2.7) below.

3. The novel poultry egg crack detection device according to claim 1, characterized in that: The housing (1) includes a bottom frame (1.2), a protective shell (1.3) is provided in the middle of the bottom frame (1.2), and an inlet / outlet baffle (1.1) is installed at the output end of the bottom frame (1.2).

4. A novel poultry egg crack detection device according to claim 3, characterized in that: The egg holder (2.5) is wheel-shaped, thin in the middle and thick at both ends, with a smooth transition. The distance between adjacent egg holders (2.5) is smaller than the diameter of the poultry egg (4).

5. A novel poultry egg crack detection device according to claim 4, characterized in that: The egg holder (2.5) is made of food-grade silicone.

6. A novel poultry egg crack detection device according to claim 5, characterized in that: The tapping detection mechanism (3) is installed on the inside of the bottom frame (1.2) by a fixed bracket and is symmetrically distributed on the left and right sides above the egg holder (2.5).

7. A novel poultry egg crack detection device according to claim 1, characterized in that: The striking detection mechanism (3) includes a base, on which a striking head is hinged, and the striking head is attracted to or detached from an electromagnet on the base.

Images