Grading device for screening nuts by utilizing voiceprint signals

Abstract

The invention is suitable for the technical field of screening machinery, and provides a grading device for screening nuts by utilizing voiceprint signals, which comprises a mute box, an excitation device, a sound receiving device, a blanking slideway, a material blocking mechanism and a sorting mechanism. After entering the silencing box through the feeding hopper, nuts are controlled by the material blocking mechanism to fall onto the impact sound production plate of the excitation device to generate voiceprint signals, the sound receiving device collects the signals, characteristic parameter calculation and quality judgment are carried out through the analysis system, and finally good and bad nuts are guided into different discharging channels through the sorting mechanism. According to the device, external noise is effectively isolated through the mute box, the impact position is accurately adjusted through the servo motor to ensure signal consistency, and efficient and accurate nondestructive testing and grading of the internal quality of nuts are achieved by combining acoustic feature analysis and an intelligent sorting technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of screening machinery, more particularly, it relates to a grading device for screening nuts by using voiceprint signals. BACKGROUND

[0002] Nuts are a kind of agricultural and forestry products with hard shells, rich in nutrients such as protein, oil, minerals and vitamins, and have high nutritional and medicinal values. They are also favored by consumers for their taste and flavor, and are important snacks and high-quality sources of healthy diets in people's daily life. Common varieties include walnuts, hazelnuts, almonds, cashews and chestnuts, etc. However, due to the influence of growing environment and cultivation technology, the quality of nuts is uneven, and inferior products such as internal moldy seeds and internal shriveled seeds are prone to occur. Internal moldy seeds contain toxic substances, which can cause toxin exceedance if mixed into deep processing products, seriously endangering human health and causing economic losses; although internal shriveled seeds have lower edible quality, they can still be used as processing materials for low-grade kernel.

[0003] In modern grading technology, nut quality detection is mainly divided into traditional detection and non-destructive detection. Traditional detection needs to destroy the shell and evaluate by observing physical characteristics or measuring physicochemical indicators; non-destructive detection evaluates the quality by using spectral analysis, machine vision or X-ray under the condition of complete shell. However, due to the hardness of nut shell, spectral analysis and machine vision are difficult to penetrate, and although X-ray can penetrate the shell, it has certain risks and limitations. Compared with the above, acoustic detection is expected to become a key technology for identifying the internal quality of nuts due to its advantages of simplicity, efficiency and safety. However, acoustic detection also has the disadvantage of being difficult to cope with noise interference, and how to accurately identify the internal quality of nuts in a noisy environment is a key problem of acoustic detection technology. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a grading device for screening nuts by using voiceprint signals.

[0005] To solve the above technical problems, the present application is realized by the following technical scheme: The present application is a grading device for screening nuts by using voiceprint signals, which comprises a mute box, an inlet hopper extending into the interior of the mute box is penetrated through the top of the mute box, an excitation device is fixed at the bottom of the interior of the mute box, a sound collecting device is fixed at the position of the bottom of the interior of the mute box and on the side of the excitation device, a discharge chute is communicated with one end of the inlet hopper in the interior of the mute box; a material blocking mechanism matched with the discharge end of the bottom of the discharge chute is fixed on one side of the top of the excitation device, and a sorting mechanism penetrating through the mute box is fixed on the side of the excitation device.

[0006] The incentive device comprises an inclined support seat fixed to the bottom of the mute box, a servo motor, an U-shaped rebound plate fixed to the top of the inclined support seat, and a percussion sound board slidably installed in the chute.

[0007] As a preferred technical scheme of the present application, the sound collecting device comprises a rhombic base, a steel pipe support, a fixing clamp and a microphone.

[0008] As a preferred technical scheme of the present application, the material blocking mechanism comprises a fixing frame fixed to the top of the chute by a screw, a stepping motor installed on the fixing frame, and a baffle fixed to the output end of the chute and cooperated with the output end of the chute.

[0009] As a preferred technical scheme of the present application, the sorting mechanism comprises an inclined guide chute and a support frame, the inclined guide chute extends into the U-shaped rebound plate along the inclined support seat, two distribution chutes are communicated with the bottom of the inclined guide chute, the support frame is horizontally arranged at the joint of the inclined guide chute and the two distribution chutes and is fixedly connected to the bottom of the mute box, the output ends of the two distribution chutes extend through the mute box and reach the outside of the mute box, a driving motor is installed on the support frame outside the mute box, and a push plate is fixed to the driving motor through a driving arm extending to the joint of the two distribution chutes.

[0010] As a preferred technical scheme of the present application, a sealing box door is hingedly connected to one side of the mute box, an observation window is formed in the sealing box door, double-layer soundproof glass is installed in the observation window, a lock slot is installed on the mute box, and a lock block cooperated with the lock slot is slidably arranged on one side of the sealing box door.

[0011] As a preferred technical scheme of the present application, the chute has a slope and a curvature, and a conical guide cover is fixed to the bottom of the chute and in contact with the top of the baffle.

[0012] As a preferred technical scheme of the present application, the inclination of the inclined support seat and the inclination of the chute and the percussion sound board are all 20°.

[0013] As a preferred technical scheme of the present application, a wire hole for installing a corrugated pipe is formed in the rear side of the mute box.

[0014] The present application has the following advantages: 1、The present application adjusts the position of the impact sound board by servo motor and intermediate gear mechanism, so that the nuts impact the sound board in a consistent form, which helps to obtain more stable and consistent voiceprint signals. Combined with the central analysis system and feature analysis algorithm, the characteristic acoustic parameters of nuts can be quickly and accurately calculated, and efficient and accurate screening is realized. Not only improves the screening accuracy, but also improves the overall work efficiency, meets the demand of large-scale sorting and grading of nut industry.

[0015] 2、The design of the mute box can not only effectively isolate external noise, but also reduce the vibration of the equipment during work. Further reduce the interference, improve the quality of voiceprint signal collection, and improve the accuracy of nut screening.

[0016] 3、The sound collecting device is designed in the soundproof box body, compared with the existing voiceprint collecting equipment, which can effectively avoid the interference of external noise, and through the design of the soundproof box body, the vibration of the equipment during work can be effectively reduced, and the interference can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structure diagram of the present application is a kind of grading device for screening nuts using voiceprint signals.

[0018] Figure 2 The structure diagram of the present application is a kind of grading device for screening nuts using voiceprint signals.

[0019] Figure 3 The structure diagram of the present application is a kind of grading device for screening nuts using voiceprint signals.

[0020] Figure 4 The structure diagram of the present application is a kind of grading device for screening nuts using voiceprint signals.

[0021] Figure 5 The structure diagram of the present application is a kind of grading device for screening nuts using voiceprint signals.

[0022] Figure 6 The structure diagram of the present application is a kind of grading device for screening nuts using voiceprint signals. Figure 5 The structure diagram of the present application is a kind of grading device for screening nuts using voiceprint signals.

[0023] Figure 7 The structure diagram of the present application is a kind of grading device for screening nuts using voiceprint signals.

[0024] Figure 8 The structure diagram of the present application is a kind of grading device for screening nuts using voiceprint signals.

[0025] Figure 9 The structure diagram of the present application is a kind of grading device for screening nuts using voiceprint signals.

[0026] Figure 10 The structure diagram of the present application is a kind of grading device for screening nuts using voiceprint signals.

[0027] In the drawings: 1, mute box; 2, feed hopper; 3, incentive device; 301, inclined support seat; 302, servo motor; 303, sliding groove; 304, U-shaped rebound plate; 305, impact sound board; 306, drive rack; 307, transfer gear; 4, sound collecting device; 5, blanking chute; 6, material blocking mechanism; 601, fixed frame; 602, stepper motor; 603, baffle; 7, sorting mechanism; 701, inclined guide chute; 702, support frame; 703, distribution chute; 704, drive motor; 705, push plate; 8, sealing box door; 9, wire hole. DETAILED DESCRIPTION

[0028] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are only used to explain the present application, and are not used to limit the scope of the present application. In the following paragraphs, the present application is described in more detail with reference to the accompanying drawings. It should be noted that the drawings are very simplified and use non-precise proportions, only for the purpose of facilitating, clarifying and assisting in the description of the embodiments of the present application.

[0029] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there can be a middle component. When a component is referred to as "disposed on" another component, it can be directly disposed on the other component or there can be a middle component. The terms "vertical", "horizontal", "left", "right" and the like used herein are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] Example one:

[0032] Please refer to Figures 1-10 Structural diagram, the present application provides the following technical solutions: Specifically refers to a kind of using voiceprint signal to screen nut grading device, including mute box 1, mute box 1 adopts sound insulation design, inner wall pastes sound insulation cotton, mute box 1 rear side is provided with guide wire hole 9 for installing corrugated conduit, guide wire hole 9 installs corrugated conduit for incoming line and outgoing line, the top of mute box 1 is provided with the feed hopper 2 extending into the interior of mute box 1, the feed hopper 2 is square funnel, the size of funnel mouth part is 190*190mm, it is convenient for the sliding guide of nut feeding and falling;When feeding, it is fed by vibrating disc, wherein, the vibrating disc is purchased from the market vibrating disc product, which is composed of hopper, bottom plate, controller, linear feeder and storage bin, the inner bottom of mute box 1 is fixed with excitation device 3, the inner bottom of mute box 1 and the position of one side of excitation device 3 are fixed with sound collecting device 4, sound collecting device 4 includes rhombus base, steel pipe support, fixed clamp and microphone, the microphone is positioned and fixed in the fixed clamp hole, the fixed clamp can move up and down along the steel pipe, and is fixed according to the voiceprint collection condition, so that the adjustment of the collection equipment in the interior of mute box 1 can be conveniently realized, therefore the detection demand of different kinds of nuts can be adapted.

[0033] The one end of feed hopper 2 in the interior of mute box 1 is communicated with a discharging chute 5, the discharging chute 5 has slope and curvature, the slope structure is beneficial to natural falling, and the curvature part controls the falling speed, the material slides to the curvature part at a slow speed, and falls close to the outer edge under the action of centrifugal force;The top of excitation device 3 is fixed with a material blocking mechanism 6 matched with the discharging end of discharging chute 5, and the side of excitation device 3 is fixed with a sorting mechanism 7 penetrating through mute box 1.

[0034] The material blocking mechanism 6 includes a fixed frame 601 fixed on the top of sliding groove 303 by screws, a stepping motor 602 installed on the fixed frame 601, a baffle 603 fixed on the output shaft end of stepping motor 602 and located at the lower end of the output end of discharging chute 5 and matched with the output end of discharging chute 5, and a conical guide cover fixed at the bottom of discharging chute 5 and in contact with the top of baffle 603.The stepping motor 602 drives rotation by a certain angle to control the opening and closing of baffle 603 at the falling port, when a batch of nuts is transmitted to the front baffle 603 of excitation device 3, the baffle 603 is in the closed state, when receiving the excitation instruction, the baffle 603 is in the open state, and freely falls to the impact sound plate 305 of excitation device 3, the impact generates a sound signal, the microphone and sensor collect the voiceprint signal, through calculation and analysis, the command is transmitted to the control system of sorting mechanism 7, and the driving arm and the lever 705 are controlled to sort the inferior nuts and healthy nuts to two different discharging ports to output at this time, the next batch of nuts with grading discrimination will be synchronously slid to the chute lower outlet of mute box 1.

[0035] The sorting mechanism 7 comprises an inclined guide chute 701 extending into the U-shaped rebound plate 304 along the inclined support seat 301, and a support frame 702. The bottom of the inclined guide chute 701 is communicated with two distribution chutes 703. The support frame 702 is transversely arranged at the joint of the inclined guide chute 701 and the two distribution chutes 703, and is fixedly connected with the inner bottom of the soundproof box 1. The output ends of the two distribution chutes 703 penetrate through the soundproof box 1 and extend to the outside of the soundproof box 1.

[0036] The soundproof box 1 is hingedly connected with a sealing box door 8 on one side. An observation window is formed in the sealing box door 8, and double-layer soundproof glass is installed in the observation window. A lock slot is installed on the soundproof box 1, and a lock block matched with the lock slot is slidably arranged on one side of the sealing box door 8.

[0037] After the nuts are arranged in a single channel by the arrangement mechanism of the feeding funnel 2 and the discharging chute 5, the control baffle 603 is opened, and the nuts are adjusted to slide into the soundproof box 1 by the beat controller. At this time, the previous batch of nuts to be classified and judged will be simultaneously discharged. The nuts freely fall into the sound generating plate 305 in the excitation device 3, and impact to generate a sound signal. The sound signal is collected in real time by the microphone nearby. The collected signal is converted into digital information by an A / D converter, and is synchronously transmitted to a central analysis system. The system quickly calls the characteristic analysis algorithm embedded in the controller, calculates the characteristic acoustic parameters of the nuts, inputs the characteristic parameters into a Lib-SVM model for calculation and analysis, and finally obtains the quality characteristics of the nuts. The judgment instruction is transmitted to the control system of the sorting mechanism 7. After receiving the instruction, the driving motor 704 drives the dial plate 705 on the driving arm to sort the inferior nuts and healthy nuts into the two distribution chutes 703 in different transmission directions, and then outputs (at this time, the next batch of nuts to be classified and judged will be simultaneously slid into the soundproof box 1).

[0038] Embodiment two:

[0039] The difference between the embodiment and the specific embodiment one is that: As shown in Figure 2 , Figures 4-7 , the excitation device 3 comprises an inclined support seat 301 fixedly arranged on the inner bottom of the soundproof box 1, and a servo motor 302. The top of the inclined support seat 301 is fixedly connected with a sliding groove 303. The top of the sliding groove 303 is fixedly connected with a U-shaped rebound plate 304. The sliding groove 303 is slidably connected with an impact sound generating plate 305. The inclined angles of the inclined surface of the inclined support seat 301, the sliding groove 303 and the impact sound generating plate 305 are all 20°. The inclined surface angle plays a role in accelerating the flow of the impacted material to the distribution port. At the same time, the excitation device 3 is designed as an inclined surface, so that the nuts rebound after impact, thereby being difficult to collide again, effectively reducing the interference of the soundprint signal. After rebounding, the nuts will directly enter the sorting mechanism 7 for sorting.

[0040] The driving rack 306 is fixed on one side of the impact sound board 305, the middle transfer gear 307 engaged with the driving rack 306 is rotatably installed on one side of the sliding groove 303, and the output shaft end of the servo motor 302 is engaged with the middle transfer gear 307 through a transmission gear. The servo motor 302 adjusts the position of the impact point of the impact sound board 305 through the middle transfer gear 307 and the transmission gear, so that the impact sound board 305 is consistent in shape when the nuts impact the impact sound board 305, and the screening precision of the nuts is improved.

[0041] The above are only specific embodiments of the present application, but the technical features of the present application are not limited to this. Any simple change, equivalent replacement or modification made on the basis of the present application to solve the basically same technical problem and realize the basically same technical effect is covered in the protection scope of the present application.

Claims

1. A grading device for screening nuts using voiceprint signals, comprising a soundproof box (1), wherein a feeding funnel (2) extending into the interior of the soundproof box (1) is perforated at the top of the soundproof box (1), characterized in that: An excitation device (3) is fixed at the bottom of the soundproof box (1). A sound receiving device (4) is fixed at the bottom of the soundproof box (1) and on one side of the excitation device (3). The feed hopper (2) is connected to a discharge chute (5) at one end inside the soundproof box (1). The top side of the excitation device (3) is fixed with a baffle mechanism (6) that cooperates with the bottom discharge end of the feeding slide (5), and the side of the excitation device (3) is fixed with a sorting mechanism (7) whose discharge end passes through the silent box (1). The excitation device (3) includes an inclined support base (301) fixed at the bottom of the soundproof box (1) and a servo motor (302). A slide groove (303) is fixed on the top of the inclined support base (301), a U-shaped rebound plate (304) is fixed on the top of the slide groove (303), and an impact sound-generating plate (305) is slidably installed in the slide groove (303). A drive rack (306) is fixed on one side of the impact sound plate (305), and a central gear (307) that meshes with the drive rack (306) is rotatably installed on one side of the slide groove (303). The output shaft end of the servo motor (302) meshes with the central gear (307) through the transmission gear.

2. A grading device for screening nuts using voiceprint signals according to claim 1, characterized in that, The sound receiving device (4) consists of a rhomboid base, a steel pipe support, a fixing clamp, and a microphone. The microphone is fixed after being positioned in the fixing clamp hole.

3. A grading device for screening nuts using voiceprint signals according to claim 1, characterized in that, The material blocking mechanism (6) includes a fixed frame (601) fixed to the top of the slide (303) by screws. A stepper motor (602) is installed on the fixed frame (601). A baffle (603) located below the output end of the material feeding slide (5) and cooperating with the output end of the material feeding slide (5) is fixed to the output shaft end of the stepper motor (602).

4. A grading device for screening nuts using voiceprint signals according to claim 1, characterized in that, The sorting mechanism (7) includes an inclined guide chute (701) and a support frame (702). The inclined guide chute (701) extends along the inclined support base (301) into the U-shaped rebound plate (304). The bottom of the inclined guide chute (701) is connected to two distribution chute (703). The support frame (702) spans across the connection between the inclined guide chute (701) and the two distribution chute (703) and its bottom is fixedly connected to the bottom of the soundproof box (1). The output ends of the two distribution chute (703) both penetrate the soundproof box (1) and extend to the outside of the soundproof box (1). A drive motor (704) is mounted on the support frame (702), and the drive motor (704) is fixed with a baffle (705) via a drive arm that extends to the intersection of the two feed troughs (703).

5. A grading device for screening nuts using voiceprint signals according to claim 1, characterized in that, The soundproof box (1) has a hinged sealed door (8) on one side. An observation window is provided on the sealed door (8). Double-layered soundproof glass is installed in the observation window. A lock groove is installed on the soundproof box (1). A lock block that cooperates with the lock groove is slidably provided on one side of the sealed door (8).

6. A grading device for screening nuts using voiceprint signals according to claim 1, characterized in that, The feeding chute (5) has a slope and a bend, and a conical guide cover is fixed at the bottom of the feeding chute (5) with its bottom end in contact with the top of the baffle (603).

7. A grading device for screening nuts using voiceprint signals according to claim 1, characterized in that, The inclined surface of the inclined support (301), the sliding groove (303), and the impact sound-generating plate (305) all have an inclination angle of 20°.

8. A grading device for screening nuts using voiceprint signals according to claim 1, characterized in that, The soundproof box (1) has a wire hole (9) on the rear side for installing a corrugated conduit.

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