Online filament electronic balance device and measurement method thereof

Abstract

The application discloses an online filament electronic balance device and a detection method thereof. The device comprises a shell, the inside of the shell is provided with an MCU single-chip microcomputer, a bridge type detection circuit and a communication interface, the bridge type detection circuit is an LC bridge circuit, and the LC bridge circuit comprises two air medium plate capacitors, one double-wire parallel coil, two trimming capacitors, one alternating current oscillator and one third coil. The air medium plate capacitor is composed of two parallel capacitor plates, and the double-wire parallel coil is composed of two groups of coils which are parallel wound on the same framework. The upper surface of the shell is provided with two left and right detection grooves through T-shaped blocks, the upper and lower walls of each detection groove are respectively embedded with two capacitor plates of a plate capacitor, and the front and rear ends of the lower wall of each detection groove are respectively provided with filament positioning porcelain strips. The application realizes high-precision electronic balance measurement of the online filament, meets the operation requirement of the filament dividing machine, and can support the online operation of the filament dividing device which divides large filament into small filament.

Description

Technical Field

[0001] This invention belongs to the field of textile machinery, specifically relating to an online electronic balance device for high-performance composite fiber and its measurement method. Background Technology

[0002] Currently, the tows of high-performance composite fibers are becoming increasingly larger. For example, carbon fiber with tows of 48K or higher is the mainstream product, offering better cost-effectiveness than smaller tows. However, smaller tows are easier to use in applications of high-performance composite fibers. Therefore, there is a need to divide purchased large tows of high-performance composite fibers into smaller tows before use. For example, dividing one 48K carbon fiber tow into eight 6K smaller tows. Dividing large tows requires a specialized fiber divider, but if the divider cannot quickly and online detect the quality of the divided tows, it cannot guarantee the equal distribution of the large tows, thus compromising the quality of the division. Therefore, there is an urgent need for an electronic balance device that can work in conjunction with the fiber divider to detect the tows online, ensuring that large tows can be divided with high precision and equal quality. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides an online wire bundle electronic balance device and its measurement method to achieve high-precision electronic balance averaging measurement of online wire bundles.

[0004] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution: An online electronic balance device for filament bundles includes a housing. Inside the housing are an MCU microcontroller, a bridge detection circuit, and a communication interface. The bridge detection circuit is connected to the MCU microcontroller and is used for quality detection of small filament bundles. The MCU microcontroller is connected to the communication interface, which is used to enable communication between the MCU microcontroller and a control backend. The bridge-type detection circuit is an LC bridge circuit, which includes two air-dielectric parallel plate capacitors, one double-wire parallel-wound coil, two fine-tuning capacitors, one AC oscillator, and one third coil. The two air-dielectric parallel plate capacitors are the first detection capacitor and the second detection capacitor, respectively. Both the first detection capacitor and the second detection capacitor are composed of two parallel capacitor plates. The double-wire parallel-wound coil is composed of a first coil and a second coil wound on the same frame. The first detection capacitor and the first coil constitute one arm of the bridge detection circuit, and the second detection capacitor and the second coil constitute the other arm of the bridge detection circuit. One end of the first detection capacitor is connected to the outer end of the first coil, and one end of the second detection capacitor is connected to the outer end of the second coil. The inner end of the first coil is connected to the inner end of the second coil and then grounded. The other end of the first detection capacitor is connected to the other end of the second detection capacitor and then serves as the bridge error signal output terminal of the bridge detection circuit. The first fine-tuning capacitor is connected in parallel across the two ends of the first detection capacitor, and the second fine-tuning capacitor is connected in parallel across the two ends of the second detection capacitor; the third coil and the double-wire winding coil are wound on the same frame, and the two ends of the third coil are respectively connected to the two ends of the AC oscillator. The AC oscillator couples the oscillation signal to the bridge detection circuit through the third coil, becoming the excitation power supply of the bridge detection circuit. A T-shaped block is provided in the middle of the upper surface of the housing. The left and right sides of the T-shaped block and the upper surface of the housing respectively form two detection slots with lateral openings on the left and right. The two first capacitor plates of the first detection capacitor are respectively embedded in the upper and lower slot walls of the detection slot on the left side. The two second capacitor plates of the second detection capacitor are respectively embedded in the upper and lower slot walls of the detection slot on the right side. A wire bundle positioning ceramic strip is provided at the front and rear ends of the lower slot walls of the left and right detection slots to position the wire bundle in the middle of the detection slot and avoid contact with the upper and lower capacitor plates.

[0005] Furthermore, the housing is provided with a zeroing / start button for eliminating bridge drift error and starting measurement. The zeroing / start button is connected to the MCU microcontroller, which eliminates the drift error of the bridge detection circuit or controls the bridge detection circuit to start measurement.

[0006] Furthermore, the housing is embedded with a display for showing the balance status of the electronic balance. The display is driven by the MCU microcontroller and displays the value of the bridge error signal output after analog-to-digital conversion and data processing by the MCU microcontroller. The display can also display other information output by the MCU microcontroller.

[0007] Furthermore, an amplification circuit is provided in the housing, which is connected between the bridge detection circuit and the MCU microcontroller to amplify the bridge error signal.

[0008] Furthermore, the amplification circuit is a programmable amplification circuit, and the housing is provided with a set of amplification adjustment buttons for adjusting the signal amplification factor of the amplification circuit. The amplification adjustment buttons are connected to the MCU microcontroller, and the signal amplification factor of the amplification circuit is adjusted by the MCU microcontroller.

[0009] Furthermore, the planar shape of the shell and the T-shaped block is symmetrical about the central axis, and the capacitor plates on both sides of the axis are at a certain angle to the central axis, which is conducive to the two separate filaments passing through the two parallel capacitor plates in the parallel capacitor with a shorter detection projection length.

[0010] The aforementioned projection length refers to the length of the projection left on the upper and lower capacitor plates as the filament passes through them. This length is precisely the portion of the filament that affects the capacitance. For rectangular capacitor plates, the shortest projection is when the filament is orthogonal to one side of the capacitor plate.

[0011] A measurement method for an online wire bundle electronic balance device includes the following steps: 1) When both detection slots are empty, that is, when there is only air medium between the two parallel plate capacitors, press the zeroing / start button briefly. The MCU microcontroller will zero the error of the bridge detection circuit to eliminate the numerical deviation caused by bridge drift. At this time, the value on the display is zero, that is, the bridge is in the initial balance state. 2) After zeroing the error, pass the two tensioned wire bundles through the left and right parallel plate capacitors respectively, and position the two wire bundles in the middle of the left and right detection slots through the wire bundle positioning ceramic strips on both sides. Ensure that the two wire bundles do not contact the two capacitor plates of the corresponding parallel plate capacitors. At the same time, keep the two wire bundles symmetrical about the central axis with respect to the T-block to ensure that the detection projection lengths of the two wire bundles in the left and right detection slots are equal. Then press and hold the zeroing / start button, and the MCU microcontroller will start to perform wire bundle quality detection through the bridge detection circuit. 3) After the wire bundle detection is started, the error signal output of the bridge detection circuit is proportional to the capacitance difference between the two parallel plate capacitors, and the capacitance difference between the two parallel plate capacitors is proportional to the mass difference between the two wire bundles. The bridge detection circuit will use the capacitance difference between the two parallel plate capacitors as the bridge error signal output. If the masses of the two wire bundles are equal, the bridge error signal output out = 0; if the masses of the two wire bundles are not equal, the bridge error signal output out ≠ 0. 4) After the bridge error signal is output, it is sent to the amplifier circuit. By adjusting the magnification adjustment button in advance, the MCU microcontroller sets the amplification factor of the amplifier circuit. Then the amplifier circuit amplifies the bridge error signal output by the bridge detection circuit to the set magnification factor and sends it to the MCU microcontroller. 5) After receiving the amplified bridge error signal, the MCU microcontroller digitizes the bridge error signal through its built-in A / D converter. After data processing, the error signal data is sent to the display for numerical display. If the value on the display is zero, it means that the bridge is balanced, that is, the two wire bundles have equal mass. If the value on the display is not zero, it means that the bridge is unbalanced, that is, the two wire bundles are not equal. The wire bundles should be adjusted until the value on the display is zero.

[0012] Furthermore, the online wire bundle electronic balance device can perform single-compartment weighing and dual-compartment proportional weighing operations, and its operation method is as follows: 1) Keep one of the two detection slots empty, and put a tension wire bundle consisting of n monofilaments into the other slot. When the measurement is started, the value 'a' displayed on the display is the weight of the tension wire bundle consisting of n monofilaments. This is the single-slot weighing; where n is a positive integer. 2) Place a bundle of tensioned m monofilaments into the empty slot. When the measurement is started, the value b displayed on the screen is a numerical representation of the weight of (mn) monofilaments, which satisfies the relationship: b / a=(mn) / n. This is the dual-slot proportional weighing; where m is a positive integer greater than n. 3) If b / a=k, then mn=kn, that is, given the value of n, the value of m can be obtained: m=(k+1)n; During the single-slot weighing or dual-slot proportional weighing process, the amplification factor of the amplifier circuit remains unchanged, and the value of k is within the linear range of the amplifier circuit.

[0013] Furthermore, in use, one set of this online electronic balance device can be used to measure the filament bundle in two equal parts, two sets of this online electronic balance device can be used to measure the filament bundle in three equal parts, and so on, thereby supporting the online operation of the filament bundle dividing large filament bundles into small filament bundles.

[0014] Furthermore, the MCU microcontroller eliminates the drift error of the bridge detection circuit by memorizing the current value and then subtracting it from the subsequent measurement output, thereby eliminating the drift error.

[0015] Furthermore, the relationship between the displayed value and the balance of the electronic balance is as follows: a value of 0 indicates that the electronic balance is balanced, and a value other than 0 indicates that the electronic balance is unbalanced. A positive value can be defined as the wire bundle in the right detection slot of the electronic balance being heavier, while a negative value indicates the wire bundle in the left detection slot of the electronic balance being heavier. The larger the absolute value of the value, the greater the deviation of the electronic balance from its balanced position, i.e., the greater the mass deviation of the wire bundle. Alternatively, it can be defined in reverse: a positive value is displayed for a heavier left slot, and a negative value is displayed for a heavier right slot. Other representation methods can also be defined, such as numbering the two detection slots 1 and 2, and then displaying the measurement values ​​for slots 1 and 2 respectively; or numbering the two detection slots A and B, and then only displaying the number of the heavier detection slot; if it is a color display, different colors can be used to distinguish them, and then only the color corresponding to the heavier detection slot is displayed.

[0016] Compared with the prior art, the beneficial effects of the present invention are: When the filament bundle passes through two parallel capacitor plates, the capacitance of the air-medium parallel plate capacitor changes because the dielectric constant of the filament bundle is different from that of air. The change in capacitance is proportional to the mass of the filament bundle and is independent of the thickness of the individual filaments, the fluffiness of the filament bundle, and the cross-sectional shape of the filament bundle. The bridge is only in equilibrium when the mass of the filament bundle passing through the two capacitor plates of the two air-medium parallel plate capacitors is equal. Therefore, the capacitance detection method used in this invention is significantly superior to the optical projection detection scheme.

[0017] This invention enables high-precision online electronic averaging measurement of fiber bundles, meeting the operational requirements of fiber splitting machines when dividing large fiber bundles of carbon fiber into several smaller fiber bundles. One set of this device can achieve bi-division measurement of fiber bundles, and two sets of this device can achieve tri-division measurement of fiber bundles, thus supporting the online operation of the fiber splitting device that divides large fiber bundles into smaller fiber bundles.

[0018] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a block diagram illustrating the electrical principle of the online wire bundle electronic balance device of the present invention; Figure 2This is a partial electrical schematic diagram of the bridge detection circuit in this invention; Figure 3 This is a schematic diagram of the external structure of the online wire bundle electronic balance device of the present invention; Figure 4 This is a schematic diagram of the bisection fiber bundle detection method of the present invention; Figure 5 This is a perspective view of the bisection fiber bundle detection method of the present invention; Figure 6 This is a schematic diagram of the non-detection of the bisectioned filament bundle of the present invention; Figure 7 This is a schematic diagram of the three-part fiber bundle detection method of the present invention; Figure 8 This is a perspective view of the three-part fiber bundle detection method of the present invention; Figure 9 This is a schematic diagram of the non-detection of the three-part fiber bundle of the present invention. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] See Figure 1 As shown, an online electronic balance device for filament bundles includes a housing 1. Inside the housing 1 are an MCU microcontroller 2, a bridge detection circuit 3, and a communication interface 13. The bridge detection circuit 3 is connected to the MCU microcontroller 2 and is used for quality detection of small filament bundles. The MCU microcontroller 2 is connected to the communication interface 13 and is used to realize the communication connection between the MCU microcontroller 2 and the control backend.

[0022] See Figure 2 As shown, the bridge detection circuit 3 is an LC bridge circuit. The bridge detection circuit 3 includes two air-dielectric parallel plate capacitors, one double-wire parallel-wound coil L, two fine-tuning capacitors, one AC oscillator S, and one third coil L3. The two air-dielectric parallel plate capacitors are the first detection capacitor C1 and the second detection capacitor C2, respectively. The first detection capacitor C1 and the second detection capacitor C2 are both composed of two parallel capacitor plates. The double-wire parallel-wound coil L is composed of the first coil L1 and the second coil L2 wound on the same frame.

[0023] The first detection capacitor C1 and the first coil L1 constitute one arm of the bridge detection circuit 3, and the second detection capacitor C2 and the second coil L2 constitute the other arm of the bridge detection circuit 3. One end of the first detection capacitor C1 is connected to the outer end of the first coil L1, and one end of the second detection capacitor C2 is connected to the outer end of the second coil L2. The inner end of the first coil L1 is connected to the inner end of the second coil L2 and then grounded. The other end of the first detection capacitor C1 is connected to the other end of the second detection capacitor C2 and then serves as the bridge error signal output terminal OUT of the bridge detection circuit 3.

[0024] The first fine-tuning capacitor C3 is connected in parallel across the two ends of the first detection capacitor C1, and the second fine-tuning capacitor C4 is connected in parallel across the two ends of the second detection capacitor C2; the third coil L3 and the double-wire wound coil L are wound on the same frame, and the two ends of the third coil L3 are respectively connected to the two ends of the AC oscillator S. The AC oscillator S couples the oscillation signal to the bridge detection circuit 3 through the third coil L3, becoming the excitation power supply of the bridge detection circuit 3.

[0025] See Figure 3 As shown, a T-shaped block 6 is provided in the middle of the upper surface of the housing 1. The left and right sides of the T-shaped block 6 and the upper surface of the housing 1 respectively form two side-opening detection grooves 7. The two first capacitor plates 4 of the first detection capacitor C1 are respectively embedded in the upper and lower groove walls of the left detection groove 7. The two second capacitor plates 5 of the second detection capacitor C2 are respectively embedded in the upper and lower groove walls of the right detection groove 7. A wire bundle positioning ceramic strip 8 is provided at the front and rear ends of the lower groove walls of the left and right detection grooves 7 to position the wire bundle in the middle of the detection groove 7 and avoid contact with the upper and lower capacitor plates.

[0026] As a further embodiment, see Figure 1 and 3 As shown, the housing 1 is provided with a zeroing / start button 9 for eliminating bridge drift error and starting measurement. The zeroing / start button 9 is connected to the MCU microcontroller 2, and the MCU microcontroller 2 eliminates the drift error of the bridge detection circuit 3 or controls the bridge detection circuit 3 to start measurement.

[0027] As a further embodiment, see Figure 1 and 3As shown, a display 10 for displaying the balance status of the electronic balance is embedded in the housing 1. The display 10 is driven by the MCU microcontroller 2 and displays the value of the bridge error signal output after analog-to-digital conversion and data processing by the MCU microcontroller 2. The display 10 can also display other information output by the MCU microcontroller 2.

[0028] As a further embodiment, see Figure 1 As shown, an amplifier circuit 11 is provided in the housing 1. The amplifier circuit 11 is connected between the bridge detection circuit 3 and the MCU microcontroller 2 and is used to amplify the bridge error signal.

[0029] As a further embodiment, see Figure 1 and 3 As shown, the amplifier circuit 11 is a programmable amplifier circuit. A set of multiplier adjustment buttons 12 for adjusting the signal amplification factor of the amplifier circuit 11 are provided on the housing 1. The multiplier adjustment buttons 12 are connected to the MCU microcontroller 2, and the signal amplification factor of the amplifier circuit 11 is adjusted by the MCU microcontroller 2.

[0030] As a further embodiment, see Figure 3 As shown, the planar shapes of the housing 1 and the T-shaped block 6 are symmetrical about the central axis, and the capacitor plates on both sides of the axis are at a certain angle to the central axis, which is conducive to the two separate filaments passing through the two parallel capacitor plates in the parallel capacitor with a shorter detection projection length.

[0031] The aforementioned detected projection length refers to the projection length left on the upper and lower capacitor plates as the filament passes through them. See also... Figure 5 As shown in the diagram, the shaded area represents the measured projection length, which is precisely the length of the wire bundle that affects the capacitance of the upper and lower capacitor plates. For rectangular capacitor plates, the shortest length is when the wire bundle is orthogonal to one side of the capacitor plate.

[0032] A measurement method for an online wire bundle electronic balance device includes the following steps: When both detection slots 7 are empty, that is, when there is only air medium between the two parallel plate capacitors, press the zeroing / start button 9 briefly. The MCU microcontroller 2 will zero the error of the bridge detection circuit 3 to eliminate the numerical deviation caused by bridge drift. At this time, the value on the display 10 is zero, that is, the bridge is in the initial balance state. The MCU microcontroller 2 eliminates the drift error of the bridge detection circuit 3 by memorizing the current value and then subtracting the value from the subsequent measurement output, thereby eliminating the drift error. 2) After the error is cleared to zero, participate Figure 5As shown, two taut wire bundles are passed through two parallel plate capacitors on the left and right sides respectively, and the two wire bundles are positioned in the middle of the two detection slots 7 by the wire bundle positioning ceramic strips 8 on both sides. This ensures that neither wire bundle contacts the two capacitor plates of the corresponding parallel plate capacitors. At the same time, the two wire bundles are kept symmetrical about the central axis with respect to the T-block 6 to ensure that the detection projection lengths of the two wire bundles in the two detection slots 7 are equal. Then, press and hold the zeroing / start button 9, and the MCU microcontroller 2 will start to perform wire bundle quality detection through the bridge detection circuit 3. 3) After the wire bundle detection is started, the error signal output of the bridge detection circuit 3 is proportional to the capacitance difference between the two parallel plate capacitors on the left and right, and the capacitance difference between the two parallel plate capacitors on the left and right is proportional to the mass difference between the two wire bundles on the left and right; the bridge detection circuit 3 will output the capacitance difference between the two parallel plate capacitors as the bridge error signal. When the slot is empty, i.e., when both the first detection capacitor C1 and the second detection capacitor C2 contain only air, the first fine-tuning capacitor C3 and the second fine-tuning capacitor C4 are adjusted to bring the bridge into a balanced state, i.e., the output out=0. When performing wire bundle detection, tensioned wire bundles pass through both capacitor plates of the first detection capacitor C1 and the second detection capacitor C2. If the two wire bundles have equal mass, the bridge will be balanced, and the bridge error signal output out=0. If the two wire bundles have unequal mass, the bridge cannot be balanced, and the bridge error signal output out≠0. 4) After the bridge error signal is output, it is sent to the amplifier circuit 11. By adjusting the magnification adjustment button 12 in advance, the MCU microcontroller 2 sets the amplification factor of the amplifier circuit 11. Then, the amplifier circuit 11 amplifies the bridge error signal output by the bridge detection circuit 3 to the set magnification factor and sends it to the MCU microcontroller 2. 5) After receiving the amplified bridge error signal, the MCU microcontroller 2 digitizes the bridge error signal through its built-in A / D converter. After data processing, the error signal data is sent to the display 10 for numerical display. If the value on the display 10 is zero, it means that the bridge is balanced, that is, the two wire bundles have equal mass. If the value on the display 10 is not zero, it means that the bridge is unbalanced, that is, the two wire bundles are not equal. The wire bundles should be adjusted until the value on the display 10 is zero.

[0033] The relationship between the displayed value of the display 10 and the balance of the electronic balance is as follows: a value of 0 indicates that the electronic balance is balanced, and a value other than 0 indicates that the electronic balance is unbalanced. A positive value can be defined as the wire bundle in the right detection slot 7 of the electronic balance being heavier, while a negative value can be defined as the wire bundle in the left detection slot 7 of the electronic balance being heavier. The larger the absolute value of the value, the greater the deviation of the electronic balance from the balance position, that is, the greater the mass deviation of the wire bundle. It can also be defined in reverse, that is, the value of the left slot being heavier is displayed as a positive value. Other representation methods can also be defined. For example, the two detection slots 7 can be numbered "1" and "2" respectively, and the measurement values ​​of 1 and 2 can be displayed respectively. Alternatively, the two detection slots 7 can be numbered "A" and "B", and only the number of the detection slot 7 that is heavier can be displayed. A color display can also be used to distinguish the two detection slots 7 with different colors, and only the color corresponding to the detection slot 7 that is heavier can be displayed.

[0034] 6) When using, please refer to Figure 4-6 As shown, using one of these online electronic balance devices for wire bundles, bisection measurement of the wire bundle can be achieved. (See [link]). Figure 7-9 As shown, by using two sets of this online electronic balance device for filament bundles, the filament bundles can be divided into three equal parts for measurement. Similarly, this enables the online operation of the device that divides large filament bundles into small filament bundles.

[0035] When it is necessary to perform a measurement of the fiber bundle in two equal parts, such as Figure 4-5 As shown, an online electronic balance device for wire bundles is pushed into the detection area from the larger opening of the two wire bundles to the smaller opening. At this point, the two wire bundles pass through the left and right detection slots of the electronic balance and are symmetrical about the central axis to ensure that the detection projection lengths of the two wire bundles in the left and right detection slots are equal. For the balance detection of wire bundles, the symmetrical central axis of the two wire bundles is very important. If they are not symmetrical, the detection projection lengths on both sides will not be equal, and the detection results will be incorrect.

[0036] When it is necessary to empty the tank or remove the in-line wire bundle electronic balance device, such as Figure 6 As shown, the online wire bundle electronic balance device is pushed from the smaller opening of the two wire bundles to the larger opening until it exits the detection area. At this time, the two wire bundles are located outside the left and right detection slots of the electronic balance, that is, the two detection slots are in an empty slot state.

[0037] When it is necessary to perform trisection measurement of the filament bundle, such as Figure 7-8As shown, two sets of online electronic balance devices are pushed into the detection areas of the first and second filament bundles (where the openings are larger) and the second and third filament bundles (where the openings are larger) towards their respective smaller openings, until both sets of online electronic balance devices reach the detection areas of the first and second filament bundles and the second and third filament bundles, respectively. At this point, the first and second filament bundles pass through the left and right detection slots of the first online electronic balance device and are symmetrical along the central axis, while the second and third filament bundles pass through the left and right detection slots of the second online electronic balance device and are symmetrical along the central axis, ensuring that the detection projection lengths of the first and second filament bundles and the second and third filament bundles are equal. If both online electronic balance devices are balanced, it indicates that the masses of the first, second, and third filament bundles are equal, meaning the filament bundles have been successfully trisected. This is the case of using two online electronic balance devices for trisecting detection. If one online electronic balance device is used to detect the first and second filament bundles, and then the second and third filament bundles, the same result can be obtained.

[0038] When it is necessary to empty the tank or remove the in-line wire bundle electronic balance device, such as Figure 9 As shown, the two sets of online wire bundle electronic balance devices are pushed out from the smaller openings of the first and second wire bundles and the smaller openings of the second and third wire bundles towards their respective larger openings, until the two sets of online wire bundle electronic balance devices are removed from the detection areas of the first and second wire bundles and the second and third wire bundles, respectively. At this time, the first and second wire bundles are located outside the left and right detection slots of the first online wire bundle electronic balance device, and the second and third wire bundles are located outside the left and right detection slots of the second online wire bundle electronic balance device, that is, the detection slots of both online wire bundle electronic balance devices are in an empty slot state.

[0039] The online wire bundle electronic balance device of the present invention can also perform single-groove weighing and double-groove proportional weighing operations, and its operation method is as follows: 1) Keep one of the two detection slots 7 empty, and put the tension wire bundle composed of n monofilaments into the other slot. When the measurement is started, the value a displayed on the display 10 is the weight of the tension wire bundle composed of n monofilaments. This is the single slot weighing; where n is a positive integer. 2) Place a bundle of tensioned m monofilaments into the empty slot. When the measurement is started, the value b displayed on the display 10 is a numerical representation of the weight of (mn) monofilaments, which satisfies the relationship: b / a=(mn) / n. This is the dual-slot proportional weighing; where m is a positive integer greater than n. 3) If b / a=k, then mn=kn, that is, given the value of n, the value of m can be obtained: m=(k+1)n; During the single-slot weighing or dual-slot proportional weighing process, the amplification factor of the amplifier circuit 11 remains unchanged, and the value of k is within the linear range of the amplifier circuit 11.

[0040] It should be noted that the wire bundle electronic balance device and its measurement method of the present invention are not only applicable to carbon fiber, but also to high-performance composite fiber such as quartz fiber, basalt fiber, and glass fiber.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An online wire bundle electronic balance device, characterized in that: It includes a housing, inside which is housed an MCU microcontroller, a bridge-type detection circuit and a communication interface respectively connected to the MCU microcontroller; The bridge detection circuit is an LC bridge circuit, including a first detection capacitor, a second detection capacitor, a double-wire wound coil composed of a first coil and a second coil wound on the same frame, a first fine-tuning capacitor, a second fine-tuning capacitor, an AC oscillator, and a third coil; the first detection capacitor and the second detection capacitor are both air-dielectric parallel plate capacitors, each composed of two corresponding parallel capacitor plates; The first detection capacitor and the first coil constitute one arm of the bridge detection circuit, and the second detection capacitor and the second coil constitute the other arm of the bridge detection circuit. One end of the first detection capacitor is connected to the outer end of the first coil, and one end of the second detection capacitor is connected to the outer end of the second coil. The inner end of the first coil is connected to the inner end of the second coil and then grounded. The other end of the first detection capacitor is connected to the other end of the second detection capacitor and then serves as the bridge error signal output terminal of the bridge detection circuit. The first fine-tuning capacitor is connected in parallel with the first detection capacitor, and the second fine-tuning capacitor is connected in parallel with the second detection capacitor; the third coil and the double-wire wound coil are wound on the same frame, and the two ends of the third coil are respectively connected to the two ends of the AC oscillator; The housing has detection slots on its left and right sides respectively. The two capacitor plates of the first detection capacitor are respectively embedded in the upper and lower walls of the detection slot on the left side. The two capacitor plates of the second detection capacitor are respectively embedded in the upper and lower walls of the detection slot on the right side. The front and rear ends of the lower walls of the left and right detection slots are respectively provided with wire bundle positioning ceramic strips.

2. The online wire bundle electronic balance device according to claim 1, characterized in that: The housing is provided with a zeroing / start button for eliminating bridge drift error and starting measurement. The zeroing / start button is connected to the MCU microcontroller, which eliminates the drift error of the bridge detection circuit or controls the bridge detection circuit to start measurement.

3. The online wire bundle electronic balance device according to claim 1, characterized in that: A display is embedded in the housing. The display is driven by the MCU microcontroller and displays the value of the bridge error signal output by the MCU microcontroller and other information.

4. The online wire bundle electronic balance device according to claim 1, characterized in that: An amplifier circuit is provided in the housing. The amplifier circuit is connected between the bridge detection circuit and the MCU microcontroller and is used to amplify the bridge error signal. The amplifier circuit is a programmable amplifier circuit, and a set of magnification adjustment buttons is provided on the housing for adjusting the signal amplification factor of the amplifier circuit. The magnification adjustment buttons are connected to the MCU microcontroller, and the signal amplification factor of the amplifier circuit is adjusted by the MCU microcontroller.

5. The online wire bundle electronic balance device according to claim 1, characterized in that: The shell and the T-shaped block are symmetrical about the central axis. The capacitor plates on both sides of the axis are at a certain angle to the central axis, which is conducive to the two separate filaments passing through the two parallel capacitor plates in the parallel capacitor with a shorter detection projection length.

6. A measurement method for an online wire bundle electronic balance device, characterized in that, Includes the following steps: When both detection slots are empty, that is, when there is only air between the two parallel capacitors, press the zeroing / start button briefly. The MCU microcontroller will zero the error of the bridge detection circuit to eliminate the numerical deviation caused by bridge drift. At this time, the value on the display is zero, that is, the bridge is in the initial balance state. After the error is cleared to zero, the two tensioned wire bundles are passed through the left and right parallel plate capacitors respectively, and the two wire bundles are positioned in the middle of the left and right detection slots by the wire bundle positioning ceramic strips on both sides. It is ensured that the two wire bundles do not contact the two capacitor plates of the corresponding parallel plate capacitors. At the same time, the two wire bundles are kept symmetrical about the central axis with respect to the T-block to ensure that the detection projection lengths of the two wire bundles in the left and right detection slots are equal. Then, press and hold the zeroing / start button, and the MCU microcontroller will start to perform wire bundle quality detection through the bridge detection circuit. After the wire bundle detection is started, the error signal output of the bridge detection circuit is proportional to the capacitance difference between the two parallel plate capacitors. The capacitance difference between the two parallel plate capacitors is proportional to the mass difference of the detected projected lengths of the two wire bundles. The bridge detection circuit will use the capacitance difference between the two parallel plate capacitors as the bridge error signal output. If the masses of the detected projected lengths of the two wire bundles are equal, the bridge error signal output out = 0; if the masses of the detected projected lengths of the two wire bundles are not equal, the bridge error signal output out ≠ 0. After the bridge error signal is output, it is sent to the amplifier circuit. By adjusting the magnification adjustment button in advance, the MCU microcontroller sets the amplification factor of the amplifier circuit. Then, the amplifier circuit amplifies the bridge error signal output by the bridge detection circuit to the set magnification factor and sends it to the MCU microcontroller. After receiving the amplified bridge error signal, the MCU microcontroller digitizes the bridge error signal through its built-in A / D converter. After data processing, the error signal data is sent to the display for numerical display. If the value on the display is zero, it means that the bridge is balanced, that is, the mass of the projected length of the two wire bundles is equal. If the value on the display is not zero, it means that the bridge is unbalanced, that is, the two wire bundles are not equal. The wire bundles should be adjusted until the value on the display is zero.

7. The online wire bundle electronic balance device according to claim 6, characterized in that: The online wire bundle electronic balance device includes single-compartment weighing and dual-compartment proportional weighing operation functions, and its operation method is as follows: 1) Keep one of the two detection slots empty, and put the tension wire bundle consisting of n monofilaments into the other slot. When the measurement is started, the value |a| displayed on the display is the weight of the tension wire bundle consisting of n monofilaments. This is the single-slot weighing; where n is a positive integer. 2) Place a bundle of tensioned m monofilaments into the empty slot. When the measurement is started, the value |b| displayed on the display is a numerical representation of the weight of (mn) monofilaments, which satisfies the relationship: |b / a|=(mn) / n. This is the dual-slot proportional weighing; where m is a positive integer greater than n. 3) If |b / a|=k, then mn=kn, that is, given the value of n, the value of m can be obtained: m=(k+1)n; During the single-slot weighing or dual-slot proportional weighing process, the amplification factor of the amplifier circuit remains unchanged, and the value of k is within the linear range of the amplifier circuit.

8. The online wire bundle electronic balance device according to claim 6, characterized in that: One set of the online electronic balance device for wire bundles is used to measure the wire bundle in two equal parts, two sets of the online electronic balance device for wire bundles in three equal parts, and so on, thereby supporting the online operation of the wire bundle splitting device for large wire bundles into small wire bundles.

9. The online wire bundle electronic balance device according to claim 6, characterized in that: The MCU microcontroller eliminates the drift error of the bridge detection circuit by memorizing the current value and then subtracting it from the subsequent measurement output, thereby eliminating the drift error.

10. The online wire bundle electronic balance device according to claim 6, characterized in that: The relationship between the displayed value and the balance of the electronic balance is as follows: a value of 0 indicates that the electronic balance is balanced, and a value other than 0 indicates that the electronic balance is unbalanced. A positive value indicates that the wire bundle in the right detection slot is heavier, and a negative value indicates that the wire bundle in the left detection slot is heavier. The larger the absolute value of the value, the greater the deviation of the electronic balance from its balanced position, i.e., the greater the mass deviation of the wire bundle. Alternatively, the values ​​can be defined in reverse: a positive value is displayed for a heavier left slot, and a negative value is displayed for a heavier right slot. Alternatively, the two detection slots can be numbered "1" and "2" respectively, and the measured values ​​for slots 1 and 2 can be displayed separately. Alternatively, the two detection slots can be numbered "A" and "B," and only the number of the heavier detection slot can be displayed. Alternatively, if the display is a color display, the two detection slots can be distinguished by different colors, and only the color corresponding to the heavier detection slot can be displayed.

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