Cutter blade breakage detection device for glass fiber production

Abstract

The utility model provides a blade breakage detection device for glass fiber production, which belongs to the technical field of intelligent detection and comprises a magnetic induction probe and a voltage signal acquisition and processing module. The magnetic induction probe comprises two independent induction coils which are symmetrically arranged in parallel, and a plurality of permanent magnets which are arranged around the independent induction coils; wherein the magnetic induction probe comprises two corresponding detection areas formed by two independent induction coils, the magnetic induction probe is installed at a glass fiber short-cut outlet during working, and the size of a total detection area formed by the two detection areas of the magnetic induction probe is matched with the size of the glass fiber short-cut outlet; and the voltage signal acquisition and processing module comprises a differential amplification processing unit, a filtering processing unit, an analog-to-digital conversion unit and a digital signal processing unit which are connected in sequence. According to the utility model, the non-contact detection of the broken pieces of the cutter blade can be realized.

Description

Technical Field

[0001] This utility model relates to the field of intelligent detection technology, and in particular to a blade breakage detection device for fiberglass production. Background Technology

[0002] Chopped fiberglass strands are made by cutting continuous glass fiber filaments into short fibers of a certain length (usually 3mm-25mm). The core equipment for chopped strand production is the chopped strand machine (including cutter rollers, pressure rollers, and a conveyor belt). The filaments are fed into the high-speed rotating cutter rollers (usually at 1000-3000 rpm) via the pressure rollers, where they are cut into short strands of the set length. The short strands are then fed into the conveyor belt through the chopped strand outlet (the conveyor belt is generally located below the chopped strand outlet, allowing the short strands to fall directly into it). The conveyor belt uses a vibrating screen to remove excessively short fibers and dust. The cutter rollers may consist of multiple thin carbide blades (made of magnetic material) and are periodically cleaned with a high-pressure water gun.

[0003] When the cutting roller cuts yarn at high speed, the thin alloy blades break into fragments due to stress and are fed into the conveyor belt along with the short filaments. This has two consequences: (1) the fragments mix with the glass fiber, causing contamination; (2) due to the lack of detection methods, it is impossible to detect whether the blades have broken, resulting in defective short filaments being produced in subsequent yarn cutting. The current solution is to replace the blades periodically, which results in low production efficiency.

[0004] Therefore, how to detect the fragments of a broken blade without affecting the production process or damaging the existing production line system is a problem that urgently needs to be solved. Utility Model Content

[0005] This invention provides a blade breakage detection device for glass fiber production, which solves the problem that it is difficult to achieve non-contact detection of blade breakage in the prior art.

[0006] This utility model provides a blade breakage detection device for glass fiber production, comprising: a magnetic induction probe and a voltage signal acquisition and processing module;

[0007] The magnetic induction probe includes two parallel and symmetrically arranged independent induction coils and multiple permanent magnets disposed around the independent induction coils; wherein, the magnetic induction probe includes two corresponding detection areas formed by the two independent induction coils, and the magnetic induction probe is installed at the glass fiber stub exit when working, and the size of the total detection area formed by the two detection areas of the magnetic induction probe matches the size of the glass fiber stub exit.

[0008] The voltage signal acquisition and processing module includes a differential amplification processing unit, a filtering processing unit, an analog-to-digital conversion unit, and a digital signal processing unit;

[0009] The differential amplifier unit has two input terminals connected to two independent induction coils, the output terminal of the differential amplifier unit is connected to the input terminal of the filter unit, the output terminal of the filter unit is connected to the input terminal of the analog-to-digital converter unit, and the output terminal of the analog-to-digital converter unit is connected to the digital signal processing unit.

[0010] This utility model provides a blade breakage detection device for glass fiber production, wherein the differential amplification processing unit is a differential amplification circuit, the filtering processing unit is a filtering circuit, the analog-to-digital conversion unit is an analog-to-digital converter, and the digital signal processing unit is a processor.

[0011] This utility model provides a blade breakage detection device for fiberglass production. Two independent induction coils are rectangular with the same size, and their long sides are arranged symmetrically adjacent to each other. Two permanent magnets are arranged along the axis of symmetry of the two adjacent long sides. Two permanent magnets are arranged along the other long sides of each independent induction coil. One permanent magnet is arranged along the short side of each independent induction coil. One permanent magnet is arranged along the line segment formed by connecting the midpoints of the two long sides of each independent induction coil. All permanent magnets are cuboids and are arranged in a grid-like structure.

[0012] This invention provides a blade breakage detection device for glass fiber production, wherein the analog-to-digital conversion unit has a sampling rate not lower than a preset sampling rate.

[0013] This invention provides a blade breakage detection device for fiberglass production, wherein the permanent magnet is a neodymium iron boron permanent magnet.

[0014] This invention provides a blade breakage detection device for glass fiber production. The magnetic induction probe also includes a housing for encapsulating an independent induction coil and a permanent magnet.

[0015] This utility model provides a blade breakage detection device for fiberglass production, with an independent induction coil that is 30 cm long and 15 cm wide.

[0016] This invention provides a blade breakage detection device for glass fiber production, with a preset sampling rate of 1000Hz.

[0017] The blade breakage detection device for fiberglass production provided by this utility model is a non-contact detection device with no complex signal generation device. The probe has a passive design and is simple to arrange. It does not require any modification to the fiberglass production system and does not damage the structure. The symmetrical design of the dual coils can greatly reduce the impact of environmental interference noise on the detection. The permanent magnets arranged around the coils improve the signal-to-noise ratio and make it easier to detect extremely small fragments. Furthermore, water stains in the production environment have no effect on the detection system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the blade breakage detection device for glass fiber production provided by this utility model;

[0020] Figure 2 This is a waveform analysis diagram of the low-pass filtered digital voltage difference signal processed by the digital signal processing unit as a signal analysis instrument.

[0021] Figure 3 This is a cross-sectional view of the magnetic induction probe provided by this utility model;

[0022] The attached figures are labeled as follows:

[0023] 10: Magnetic induction probe; 101: First independent induction coil; 102: Second independent induction coil; 103: Permanent magnet; 20: Voltage signal acquisition and processing module; 201: Differential amplification processing unit; 202: Filtering processing unit; 203: Analog-to-digital conversion unit; 204: Digital signal processing unit. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] It should be noted that in the description of the embodiments of this utility model, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more.

[0027] The following is combined with Figures 1-3 This invention describes a blade breakage detection device for fiberglass production provided by an embodiment of the present invention.

[0028] Figure 1 This is a schematic diagram of the blade breakage detection device for fiberglass production provided by this utility model. The blade breakage detection device described in this utility model is mainly used to detect fragments of broken short blades during the fiberglass production process. Its core structure includes a magnetic induction probe 10 and a voltage signal acquisition and processing module 20.

[0029] like Figure 1 As shown, the magnetic induction probe 10 consists of two parallel and symmetrically arranged independent induction coils (a first independent induction coil 101 and a second independent induction coil 102) and a plurality of permanent magnets 103 distributed around them. Optionally, the permanent magnets 103 are neodymium iron boron permanent magnets made of neodymium iron boron material; the number, arrangement, and position of the permanent magnets 103 can be adjusted according to actual needs. Figure 1 This only shows one setting.

[0030] The magnetic induction probe 10 includes two corresponding detection areas formed by two independent induction coils. During operation, the magnetic induction probe is installed at the glass fiber stub exit, and the total size of the detection area formed by the two detection areas of the magnetic induction probe matches the size of the glass fiber stub exit. Understandably, the manufactured product and any blade fragments mixed in can pass through the total detection area.

[0031] The voltage signal acquisition and processing module 20 includes a differential amplification processing unit 201, a filtering processing unit 202, an analog-to-digital conversion unit 203, and a digital signal processing unit 204 connected in sequence. The outputs of two independent induction coils (first independent induction coil 101 and second independent induction coil 102) are respectively connected to the two inputs of the differential amplification processing unit 201. The differential amplification circuit eliminates environmental common-mode interference and amplifies the induced voltage difference to acquire an analog voltage difference signal. The filtering processing unit 202 uses a bandpass filter circuit to filter out high-frequency noise and low-frequency drift signals in the analog voltage signal. The sampling rate of the analog-to-digital conversion unit 203 is set to no less than 1000Hz to ensure accurate acquisition of dynamic signals, converting the filtered analog voltage difference signal into a digital voltage difference signal. Finally, the digital signal processing unit 204 performs real-time analysis on the digital voltage difference signal to obtain the detection results.

[0032] Additionally, a digital signal processing unit (DSP) chip, such as the TMS320C6000 series, can be used. By comparing simple thresholds, if the voltage difference exceeds a preset threshold, it can be determined that a blade fragment has broken off.

[0033] The digital signal processing unit in this invention can also be a signal analysis instrument with digital signal waveform display and analysis. Professionals can use the digital analyzer to perform peak analysis of the digital voltage difference signal to confirm the blade falling.

[0034] Figure 2 This is a waveform analysis diagram of the low-pass filtered digital voltage difference signal processed by the digital signal processing unit as a signal analysis instrument, such as... Figure 2 As shown, the staff could detect four distinct pulse waves, meaning that four instances of blade fragments falling were detected.

[0035] As an optional embodiment, the differential amplification processing unit, filtering processing unit, and analog-to-digital conversion unit in this utility model can be integrated devices or circuits that implement the corresponding functions.

[0036] For the differential amplifier processing unit, as an integrated device, this invention can select a dedicated differential amplifier chip, such as the common LM358 operational amplifier chip. These chips integrate the circuit structure required for differential amplification, offering advantages such as high gain, high input impedance, and low noise. They can directly perform differential amplification of the input signal, are easy to use, and have stable and reliable performance. Differential amplification of the voltage signals generated by two independent induction coils can be achieved simply by adjusting the gain and matching the circuit with external resistors and other simple components. Alternatively, as a discrete circuit, the differential amplifier circuit can be constructed from discrete electronic components such as operational amplifiers, resistors, and capacitors. For example, using a classic differential amplifier circuit structure, two operational amplifiers and corresponding input and feedback resistors can be used. By rationally designing the circuit parameters, differential amplification of two input signals can be achieved. Although the design and fabrication of discrete circuits are relatively complex, in some special applications, such as those with specific performance requirements or strict cost control, discrete circuits offer more flexible adjustment and optimization options.

[0037] For the filtering unit, as an integrated device, this invention can employ an active filter chip, such as the MAX274. These chips integrate the amplifiers, resistors, capacitors, and other components required for filtering, enabling filtering within a specific frequency range. They offer advantages such as good filtering effect, small size, and ease of use. By setting the parameters of the corresponding external components, the filter's cutoff frequency and other characteristics can be adjusted to meet the signal filtering requirements of different scenarios, effectively removing unwanted noise and interference signals. Alternatively, as a discrete circuit, this invention can utilize discrete components such as resistors, capacitors, inductors, and operational amplifiers to form the filtering circuit. Examples include common LC filter circuits, RC filter circuits, and active filter circuits. Filter circuits of different orders and filtering types can be designed according to the actual signal characteristics and filtering requirements. Discrete filter circuits offer advantages in terms of flexibility and customizability.

[0038] For the analog-to-digital conversion unit, existing integrated devices are generally sufficient. This invention can use an analog-to-digital converter (ADC) chip, such as the ADS7828. These chips integrate a series of circuit functions required for analog-to-digital conversion, including analog signal input, sample-and-hold, and quantization encoding, and feature high sampling rate, high precision, and low power consumption. By cooperating with external control circuits and data interface circuits, they can quickly and accurately convert the filtered analog signal into a digital signal, facilitating subsequent processing by the digital signal processing unit.

[0039] As discrete circuits (which are generally not chosen due to their complexity), analog-to-digital converters are difficult to implement and have relatively limited performance in terms of accuracy and speed. However, they can be considered as an alternative in some cost-sensitive applications where performance requirements are not high.

[0040] Figure 3 This is a cross-sectional view of the magnetic induction probe provided by this utility model, as shown below. Figure 3 As shown, a specific arrangement of a permanent magnet and a coil is illustrated, such as... Figure 3 As shown, two independent induction coils (shown as yellow components) are rectangles of the same size, and their long sides are arranged symmetrically adjacent to each other. Two permanent magnets (shown as red components) are arranged along the axis of symmetry of the two adjacent long sides. Two permanent magnets are arranged along the other long sides of each independent induction coil. One permanent magnet is arranged along the short side of each independent induction coil. One permanent magnet is also arranged along the line segment formed by connecting the midpoints of the two long sides of each independent induction coil. All permanent magnets are cuboids (the size can also be the same) and are arranged in a grid-like structure.

[0041] Specifically, the two independent induction coils are 30 cm long and 15 cm wide, and 12 rectangular permanent magnets are symmetrically arranged around the coils to enhance their induction ability; at the same time, the permanent magnets can also attract the blades, reducing the contamination of the glass fiber by the debris.

[0042] The magnetic induction probe provided by this utility model also includes a housing for encapsulating an independent induction coil and a permanent magnet.

[0043] The shape and size of the housing should match the internal structure of the magnetic induction probe and the shape of the fiberglass chopped outlet. Its internal space needs to be rationally designed to ensure tight enclosure of two independently arranged parallel and symmetrical induction coils and multiple surrounding permanent magnets, while leaving appropriate gaps to facilitate the installation, fixation, and electrical connection of internal components. The housing structure should also consider airtightness, using sealing rings, gaskets, and other sealing measures to prevent external dust, moisture, and other impurities from entering and affecting the performance of the induction coils and permanent magnets. For example, all interfaces of the housing, such as the signal lead outlet, should be strictly sealed to ensure stable operation of the magnetic induction probe even in harsh working environments.

[0044] The foregoing description is merely an exemplary embodiment of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure. Those skilled in the art will readily conceive of embodiments of this disclosure upon considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not described herein. The specification and embodiments are to be considered exemplary only, and the scope and spirit of this disclosure are defined by the claims.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A blade breakage detection device for glass fiber production, characterized in that, include: Magnetic induction probe and voltage signal acquisition and processing module; The magnetic induction probe includes two parallel and symmetrically arranged independent induction coils and multiple permanent magnets disposed around the independent induction coils; wherein, the magnetic induction probe includes two corresponding detection areas formed by the two independent induction coils, and the magnetic induction probe is installed at the glass fiber stub exit when working, and the size of the total detection area formed by the two detection areas of the magnetic induction probe matches the size of the glass fiber stub exit. The voltage signal acquisition and processing module includes a differential amplification processing unit, a filtering processing unit, an analog-to-digital conversion unit, and a digital signal processing unit; The differential amplifier unit has two input terminals connected to two independent induction coils, the output terminal of the differential amplifier unit is connected to the input terminal of the filter unit, the output terminal of the filter unit is connected to the input terminal of the analog-to-digital converter unit, and the output terminal of the analog-to-digital converter unit is connected to the digital signal processing unit.

2. The blade breakage detection device according to claim 1, characterized in that, The differential amplification processing unit is a differential amplification circuit, the filtering processing unit is a filtering circuit, the analog-to-digital conversion unit is an analog-to-digital converter, and the digital signal processing unit is a processor.

3. The blade breakage detection device according to claim 1, characterized in that, The two independent induction coils are rectangles of the same size, and their long sides are arranged symmetrically adjacent to each other. Two permanent magnets are arranged along the axis of symmetry of the two adjacent long sides, two permanent magnets are arranged along the other long sides of each independent induction coil, one permanent magnet is arranged along the short side of each independent induction coil, and one permanent magnet is set along the line segment formed by connecting the midpoints of the two long sides of each independent induction coil. All permanent magnets are cuboids and are arranged in a grid pattern.

4. The blade breakage detection device according to claim 1, characterized in that, The analog-to-digital conversion unit has a sampling rate that is not lower than a preset sampling rate.

5. The blade breakage detection device according to claim 1, characterized in that, The permanent magnet is a neodymium iron boron permanent magnet.

6. The blade breakage detection device according to claim 1, characterized in that, The magnetic induction probe also includes a housing for encapsulating the individual induction coil and permanent magnet.

7. The blade breakage detection device according to claim 2, characterized in that, The independent induction coil is 30 cm long and 15 cm wide.

8. The blade breakage detection device according to claim 4, characterized in that, The preset sampling rate is 1000Hz.

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