Cotton fiber micronaire value detection device and method based on mass pressure difference compensation model

Abstract

The invention discloses a cotton fiber micronaire value detection device and method based on a mass pressure difference compensation model, and relates to the technical field of cotton fiber detection, the cotton fiber micronaire value detection device comprises a cotton sample compression module, an air source module, an air bridge loop module, a pressure difference detection part and a control part; the cotton sample compression module compresses the cotton sample; the air source module provides pressure airflow; the air bridge loop module comprises a detection air path and a contrast air path which are arranged in parallel, an air inlet of the cotton sample compression module is communicated with the detection air path, and an air outlet of the cotton sample compression module is communicated with atmosphere; the pressure difference detection piece obtains pressure difference information of the gas outlet end of the detection gas circuit and the gas outlet end of the contrast gas circuit; the control component can obtain pressure difference information; the weight information of the cotton sample compressed by the cotton sample compression module can be obtained, and the differential pressure information is corrected according to the mass differential pressure compensation model, so that the micronaire value of the cotton fiber can be obtained. According to the cotton fiber micronaire value detection device and method based on the mass pressure difference compensation model, the detection stability and the detection precision can be improved.

Description

Technical Field

[0002] This invention relates to the field of cotton fiber testing technology, and in particular to a device and method for detecting the micronaire value of cotton fibers based on a mass pressure difference compensation model. Background Technology

[0003] Micronaire value of cotton fibers is a key parameter for measuring their quality, directly affecting the spinning performance, dyeing and finishing effects, and final product quality of textiles. Near-infrared spectroscopy predicts micronaire value by analyzing the reflectance, absorptivity, and transmittance of cotton fibers at different wavelengths. However, this method relies on high-precision light source systems, sample testing platforms, data acquisition cards, and dedicated spectral analysis software, making it not only costly and complex to operate but also time-consuming, failing to meet the urgent need for rapid and stable testing in current cotton purchasing, processing, and inspection processes. Airflow analysis, with its simplicity, speed, and good repeatability, has become the mainstream technique for detecting micronaire value in cotton fibers. However, existing airflow analysis methods often suffer from poor stability and accuracy due to fluctuations in cotton sample quality. Summary of the Invention

[0004] The purpose of this invention is to provide a cotton fiber micronaire value detection device and method based on a mass pressure difference compensation model, so as to solve the problems existing in the prior art and improve the detection stability and detection accuracy.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a cotton fiber micronaire value detection device based on a mass pressure difference compensation model, comprising a cotton sample compression module, an air source module, an air bridge circuit module, a pressure difference detection element, and a control component. The cotton sample compression module is used to compress the cotton sample. The air source module is used to provide pressurized airflow. The air bridge circuit module includes a detection air path and a control air path connected in parallel. The inlet ends of both the detection air path and the control air path are connected to the air source module to allow pressurized airflow to enter. Furthermore, the inlet of the cotton sample compression module is connected to the detection air path. The cotton sample compression module has an outlet that is open to the atmosphere; the differential pressure detection element is connected to both the outlet of the detection air path and the outlet of the control air path, and is used to detect the differential pressure information between the outlets of the detection air path and the control air path; the control component is communicatively connected to the differential pressure detection element and can acquire the differential pressure information; the control component can also acquire the weight information of the cotton sample compressed by the cotton sample compression module, and correct the differential pressure information according to the mass differential pressure compensation model to obtain the micronaire value of the cotton fiber.

[0006] Preferably, the air bridge circuit module further includes a first air resistance component, a second air resistance component, and an adjusting component; the first air resistance component is disposed on the detection air path, the second air resistance component is disposed on the control air path, and the resistance value of the first air resistance component is greater than the resistance value of the second air resistance component; the adjusting component connects the detection air path and the control air path, and the adjusting component is used to adjust the initial air pressure of the detection air path and the control air path to reach a preset mechanical zero point.

[0007] Preferably, the air bridge circuit module further includes a reversing valve, which is configured to connect the detection air path and the control air path. The reversing valve can control the detection air path and the control air path to be connected to the differential pressure detection element, or control the detection air path and the control air path to be disconnected from the differential pressure detection element and connected to the atmosphere.

[0008] Preferably, the cotton sample compression module includes a compression cylinder, a cylinder cover assembly, and a compression mechanism; the compression cylinder is used to hold the cotton sample, the compression mechanism is movably connected to one axial side of the compression cylinder and can compress the cotton sample inside the compression cylinder, the cylinder cover assembly is located on the other side of the compression cylinder opposite to the compression mechanism and can close or open the compression cylinder, and after the cylinder cover assembly closes the compression cylinder, the compression cylinder can communicate with the outside through the cylinder cover assembly; the compression mechanism can connect the detection air path and the compression cylinder, and the pressurized airflow can enter the compression cylinder through the compression mechanism, flow through the cotton sample, and be discharged through the air outlet; both the cylinder cover assembly and the compression mechanism are communicatively connected to the control component so that their operation can be controlled.

[0009] Preferably, the assembly further includes a housing, inside which a support frame is provided. The cotton sample compression module, the air bridge circuit module, and the differential pressure detection element are all mounted on the support frame, and the air source module is located inside the housing. A through hole is provided on the housing opposite to the compression cylinder. The cylinder cover assembly includes a drive assembly, a cover body, and a detection component. The cover body is located at the through hole and is movably connected to the support frame. The drive assembly is drively connected to the cover body and communicatively connected to the control component. The drive assembly can drive the cover body to rotate relative to the compression cylinder at the through hole to close or open the compression cylinder. After the cover body closes the compression cylinder, the compression cylinder can communicate with the outside through the cover body. The detection component is located on the cover body and communicatively connected to the control component. The detection component is used to detect the opening and closing state of the cylinder cover assembly relative to the compression cylinder and can send the information to the control component.

[0010] Preferably, the cover has at least one vent hole, and a dustproof plate is detachably provided on the side of the cover away from the compression cylinder.

[0011] Preferably, the system further includes a display component and a weighing component, both of which are mounted on the housing and are communicatively connected to the control component. The weighing component is used to pre-weigh the cotton sample placed in the cotton sample compression module to obtain weight information and send it to the control component. The display component is used to display the control information of the control component and to input manipulation commands.

[0012] Preferably, the air source module includes an air compressor and a plurality of pressure regulating valves connected in sequence along the airflow direction. The air compressor and the pressure regulating valves are both communicatively connected to the control component. The air compressor is used to provide high-pressure airflow, and the plurality of pressure regulating valves are used to reduce and stabilize the high-pressure airflow.

[0013] This invention also provides a method for detecting the micronaire value of cotton fibers based on a mass pressure difference compensation model. This method is applied to the aforementioned cotton fiber micronaire value detection device based on a mass pressure difference compensation model. The method includes: The air pressure difference at the midpoint of the bridge path is acquired; the air pressure difference at the midpoint of the bridge path is collected by a differential pressure transmitter. Based on the air pressure difference at the midpoint of the bridge, it is converted into the actual air pressure difference of the cotton sample through a mathematical conversion model; Based on the actual air pressure difference of the cotton sample, the compensated air pressure difference of the cotton sample is obtained using the mass pressure difference compensation model. The micronaire value of the cotton fibers in the cotton sample is determined based on the compensated air pressure difference of the cotton sample.

[0014] Preferably, the mass pressure difference compensation model is as follows: ΔP 补偿 =ΔP1+k·(m-m0); Where, ΔP 补偿 The compensated air pressure difference of the cotton sample; ΔP1 is the actual air pressure difference of the cotton sample; m is the current mass of the cotton sample being tested; m0 is the set standard mass; k is the mass-pressure difference linearity coefficient.

[0015] The present invention achieves the following technical effects compared to the prior art: The present invention provides a cotton fiber micronaire value detection device and method based on a mass pressure difference compensation model. The cotton sample is compressed by a cotton sample compression module to form a breathable plug. An air source module provides pressurized airflow. Airflow is introduced into the detection air path and control air path of the air bridge circuit module. Because the detection air path is connected to the cotton sample compression module, the airflow on the detection air path generates a pressure drop under the action of the breathable plug. A pressure difference detection component acquires the pressure difference information between the detection air path and the control air path. A control component acquires the pressure difference information and the cotton sample weight information. Based on the mass pressure difference compensation model, the control component corrects the original pressure difference information in real time to obtain the micronaire value of the cotton fiber. This avoids systematic errors caused by the sample mass deviating from the standard mass, ensures the consistency and comparability of the detection data, and solves the problem of large detection errors for non-standard mass samples. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the external structure of the cotton fiber micronaire value detection device based on the mass pressure difference compensation model provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the internal structure of the cotton fiber micronaire value detection device based on the mass pressure difference compensation model provided in Embodiment 1 of the present invention. Figure 3 This is a schematic diagram showing the cooperation between the cotton sample compression module, the differential pressure detection element, and the support frame provided in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the outer side of the adjusting component provided in Embodiment 1 of the present invention; Figure 5 for Figure 4 Cross-sectional view of the central adjustment components; Figure 6 This is a schematic diagram of the outer side of the reversing valve provided in Embodiment 1 of the present invention; Figure 7 for Figure 6 Cross-sectional schematic diagram of the reversing valve; Figure 8 This is a schematic diagram of the vent holes on the cover provided in Embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the driving component provided in Embodiment 1 of the present invention; Figure 10 This is a schematic diagram of the airflow path provided in Embodiment 1 of the present invention; Figure 11 This is a flowchart of the cotton fiber micronaire value detection method based on the mass pressure difference compensation model provided in Embodiment 1 of the present invention.

[0018] In the diagram: 1-Cotton sample compression module; 11-Compression cylinder; 12-Cylinder cover assembly; 121-Drive assembly; 1211-Drive cylinder; 1212-Upper buckle; 1213-Middle connecting rod; 122-Cover body; 123-Detection component; 124-Ventilation hole; 125-Dustproof plate; 13-Compression mechanism; 2-Air source module; 21-Air compressor; 22-Pressure regulating valve; 3-Air bridge circuit module; 31-Detection air path; 32-Control. Air path; 33-First air resistance component; 34-Second air resistance component; 35-Adjusting component; 351-Detection air path inlet; 352-Comparison air path inlet; 353-Comparison air path atmospheric connection; 354-Rotating bolt; 36-Reversing valve; 361-Air path interface; 362-Reversing valve body; 363-Reversing valve push rod; 4-Differential pressure detection component; 5-Housing shell; 6-Support frame; 7-Display component; 8-Weighing component; 9-Control component. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a cotton fiber micronaire value detection device and method based on a mass pressure difference compensation model, so as to solve the problems existing in the prior art and improve the detection stability and detection accuracy.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 This embodiment provides a cotton fiber micronaire value detection device based on a mass pressure difference compensation model. Please refer to [link to relevant documentation]. Figures 1-3The system includes a cotton sample compression module 1, an air source module 2, an air bridge circuit module 3, a differential pressure detection element 4, and a control component 9. The cotton sample compression module 1 is used to compress the cotton sample. The air source module 2 is used to provide pressurized airflow. The air bridge circuit module 3 includes a detection air path 31 and a control air path 32 connected in parallel. The inlet ends of both the detection air path 31 and the control air path 32 are connected to the air source module 2 to allow pressurized airflow to enter. The inlet of the cotton sample compression module 1 is connected to the detection air path 31. The outlet of component 1 is connected to the atmosphere; the differential pressure detection component 4 is connected to both the outlet of the detection gas path 31 and the outlet of the control gas path 32, and is used to detect the differential pressure information between the outlets of the detection gas path 31 and the control gas path 32; the control component 9 is communicatively connected to the differential pressure detection component 4 and can acquire differential pressure information; the control component 9 can also acquire the weight information of the cotton sample compressed by the cotton sample compression module 1, and correct the differential pressure information according to the mass differential pressure compensation model, so as to acquire the micronaire value of cotton fibers.

[0023] In this process, the cotton sample is compressed by the cotton sample compression module 1 to form a breathable plug. The air source module 2 provides pressurized airflow. Airflow is introduced into the detection air path 31 and the control air path 32 of the air bridge circuit module 3. Since the detection air path 31 is connected to the cotton sample compression module 1, the airflow in the detection air path 31 generates a pressure drop under the action of the breathable plug. The differential pressure detection component 4 obtains the differential pressure information between the detection air path 31 and the control air path 32. The control component 9 obtains the differential pressure information and the cotton sample weight information. According to the mass differential pressure compensation model, the control component 9 corrects the original differential pressure information in real time and obtains the micronaire value of the cotton fiber in the cotton sample. This avoids systematic errors caused by the deviation of the sample mass from the standard mass, ensures the consistency and comparability of the test data, and solves the problem of large detection errors for non-standard mass samples.

[0024] In an optional embodiment, more preferably, the air bridge circuit module 3 further includes a first air resistance component 33, a second air resistance component 34, and an adjusting component 35; the first air resistance component 33 is disposed on the detection air path 31, the second air resistance component 34 is disposed on the reference air path 32, and the resistance value of the first air resistance component 33 is greater than the resistance value of the second air resistance component 34; the adjusting component 35 connects the detection air path 31 and the reference air path 32, and the adjusting component 35 is used to adjust the initial air pressure of the detection air path 31 and the reference air path 32 to reach a preset mechanical zero point.

[0025] The air source module 2 is connected to the detection air path 31 and the control air path 32 via a three-way interface. The first air resistance component 33 and the second air resistance component 34 are set as capillary air resistance components and are respectively set in the detection air path 31 and the control air path 32 to balance the air resistance of the two air paths of the air bridge. The resistance value of the first air resistance component 33 is greater than the resistance value of the second air resistance component 34 to achieve dynamic balance of pressure difference under the bridge air path structure. The specific air resistance values ​​of the first air resistance component 33 and the second air resistance component 34 are determined as needed by adjusting the accuracy of the capillary diameter and length to output a stable impedance under working flow and pressure conditions, which is adapted to the airflow characteristics required by the detection device. The setting of the first air resistance component 33 and the second air resistance component 34 utilizes the principle of pressure drop generated by airflow passing through air resistance to convert the small absolute pressure change that is difficult to measure directly into a relative pressure difference signal that is easy to measure accurately, thus realizing high sensitivity, high speed and anti-interference detection.

[0026] Among them, adjusting component 35 is set as a zero-adjustment valve, please refer to [link / reference]. Figure 4 and Figure 5 The zero-adjustment valve is connected to the detection gas path 31 between the first air resistance component 33 and the cotton sample compression module 1, and the zero-adjustment valve is connected to the control gas path 32 after the second air resistance component 34. The zero-adjustment valve finely adjusts the differential pressure signal to enable the system to achieve and stabilize at the mechanical zero point of the air bridge in the no-load state without cotton sample, ensuring the stability of the differential pressure reference and the detection accuracy of the system. Before the formal test, the detection gas path 31 and the control gas path 32 are calibrated with air pressure and stabilized to the preset mechanical zero point. Specifically, the zero-adjustment valve is a mechanical plunger structure, which includes a valve body with a detection gas path inlet 351, a control gas path inlet 352, a control gas path atmospheric inlet 353, and internal connections to the detection gas path. The gas path channels of path 31 and reference gas path 32 are connected. Linear fine adjustment is achieved inside the valve body through rotating bolt 354. Dual adjustment channels are set on both sides of the valve body. The left side adjusts the airflow orifice diameter of the detection gas path 31, and the right side adjusts the airflow orifice diameter of the reference gas path 32. When it is necessary to adjust the mechanical zero point of the gas path, the rotating bolt 354 is operated to gradually open or close the valve. When the opening degree increases, the airflow channel in the gas path widens, the airflow resistance decreases, and the airflow rate increases accordingly. Conversely, when the closing degree increases, the airflow channel narrows, the airflow resistance increases, and the airflow rate decreases. The zero adjustment valve can be selected as needed, with an adjustment accuracy of ±0.1%FS, which is suitable for a differential pressure range of 1500Pa at full scale, corresponding to an adjustment resolution of ±1.5Pa.

[0027] In the optional embodiment, more preferably, the air bridge circuit module 3 further includes a reversing valve 36, which connects the detection air path 31 and the control air path 32. The reversing valve 36 can control the detection air path 31 and the control air path 32 to be connected to the differential pressure detection element 4, or control the detection air path 31 and the control air path 32 to be disconnected from the differential pressure detection element 4 and connected to the atmosphere.

[0028] Please see below. Figure 6 and Figure 7 The reversing valve 36 connects to the detection gas path 31 after the cotton sample compression module 1, and connects to the control gas path 32 after the second air resistance component 34. The reversing valve 36 is used to switch the conduction state of the air bridge channel between the detection state and the non-detection state. In the detection state, the reversing valve 36 controls the detection gas path 31 and the control gas path 32 to connect with the differential pressure detection element 4. In the non-detection state, the reversing valve 36 controls the detection gas path 31 and the control gas path 32 to connect with the atmosphere. In the detection state, the detection gas path 31 and the control gas path 32 are connected to the low end and the high end of the differential pressure detection element 4 respectively through the reversing valve 36. In this way, the reversing valve 36 can accurately control the airflow path, effectively avoid the detection gas flow direction from being disordered or the differential pressure detection element 4 from being overloaded in the non-detection state, and improve the differential pressure acquisition accuracy and device reliability.

[0029] Specifically, the reversing valve 36 can adopt a conventional structure, such as including a valve body with four pagoda-shaped airflow ports 361, forming a "two-in, two-out" port arrangement, which respectively connect to the detection airway 31, the reference airway 32, and the high and low ends of the differential pressure detection element 4. Figure 7 The two gas inlets 361 on the left side are respectively connected to the detection gas inlet 31 and the lower end of the differential pressure detection element 4. Figure 7 The two air passage interfaces 361 on the right side are respectively connected to the reference air passage 32 and the high end of the differential pressure detection element 4; the reversing valve body 362 has an air passage, and the outer wall of the reversing valve push rod 363 is provided with a conduction channel. The reversing valve push rod 363 is driven to move axially by a cylinder that is connected to the control component 9 to switch the conduction state of different channels. In the detection state, the detection air passage 31 is connected to the low end of the differential pressure detection element 4 through the conduction channel, and the reference air passage 32 is connected to the high end of the differential pressure detection element 4 through the conduction channel; in the non-detection state, the detection air passage 31 and the reference air passage 32 are connected to the air passage through the conduction channel to disconnect from the differential pressure detection element 4 and connect to the atmosphere; it should be noted that the specific structure of the reversing valve 36 is not limited to the above method, as long as it can realize the corresponding airflow direction switching.

[0030] In this embodiment, the air bridge circuit module 3, where multiple connections are required, can be connected using multi-port interfaces; such as... Figure 10 As shown, the air bridge circuit module 3 adopts a symmetrical air bridge design. By optimizing the mechanical zero point parameters through the zero adjustment valve, and combining the first air resistance component 33 and the second air resistance component 34, the impedance of the detection air circuit can be effectively matched, so that the midpoint of the bridge circuit can maintain static balance when unloaded. This effectively shields the interference of factors such as air source fluctuations and external disturbances on the differential pressure signal, and keeps the differential pressure fluctuation at the midpoint of the air bridge within 0.5%, thus having good field adaptability.

[0031] In the optional embodiment, more preferably, the cotton sample compression module 1 includes a compression cylinder 11, a cylinder cover assembly 12, and a compression mechanism 13; the compression cylinder 11 is used to hold cotton samples, the compression mechanism 13 is movably connected to one side of the compression cylinder 11 along its axial direction, and can compress the cotton samples inside the compression cylinder 11; the cylinder cover assembly 12 is located on the other side of the compression cylinder 11 away from the compression mechanism 13, and can close or open the compression cylinder 11; after the cylinder cover assembly 12 closes the compression cylinder 11, the compression cylinder 11 can communicate with the outside world through the cylinder cover assembly 12; the compression mechanism 13 can connect the detection air passage 31 and the compression cylinder 11, and the pressurized airflow can enter the compression cylinder 11 through the compression mechanism 13; both the cylinder cover assembly 12 and the compression mechanism 13 are communicatively connected to the control component 9 so that their operation can be controlled.

[0032] The cotton sample compression module 1 can compress the cotton sample into a dense and breathable plug, controlling the volume of the compressed cotton sample to about 50 cm³, forming a standard cotton sample plug with a specific volume of 0.16 g / cm³. It has a stable structure and good air permeability, meeting the requirements of airflow detection. Specifically, the inner diameter of the compression cylinder 11 can be 40 mm, the height of the cotton fiber plug after compression is 40 mm, and the corresponding compression volume is about 50 cm³. The specific size information can be determined according to actual needs. The compression cylinder 11 is connected to the upper cylinder cover assembly 12, and the lower end is pressed to form a cotton plug by the compression mechanism 13. This ensures accurate compression of the cotton sample volume and stable airflow, making it suitable for micronaire value detection based on airflow pressure difference.

[0033] In a preferred embodiment, the present embodiment further includes a housing 5, inside which a support frame 6 is provided. The cotton sample compression module 1, the air bridge circuit module 3, and the differential pressure detection element 4 are all mounted on the support frame 6, and the air source module 2 is located inside the housing 5. A through hole is provided on the housing 5 at a position opposite to the compression cylinder 11. The cylinder cover assembly 12 includes a drive assembly 121, a cover 122, and a detection element 123. The cover 122 is located at the through hole and is movably connected to the support frame 6. The drive assembly 121 and the cover 122 are connected to the support frame 6. 22. The drive assembly 121 is communicatively connected to the control component 9. The drive assembly 121 can drive the cover 122 to flip relative to the compression cylinder 11 at the through hole so as to close or open the compression cylinder 11. After the cover 122 closes the compression cylinder 11, the compression cylinder 11 can communicate with the outside through the cover 122. The detection component 123 is disposed on the cover 122 and is communicatively connected to the control component 9. The detection component 123 is used to detect the opening and closing state of the cylinder cover assembly 12 relative to the compression cylinder 11 and can send the information to the control component 9.

[0034] The design incorporates a housing 5, with the cotton sample compression module 1, air bridge circuit module 3, and differential pressure detection element 4 secured by an internal support frame 6, facilitating modular assembly. The connection method can be bolted, simplifying assembly and disassembly. The through-hole on the housing 5 allows the cover 122 to open and close, enabling the loading and unloading of cotton samples from the compression cylinder 11. Furthermore, the cover 122 is driven by a drive assembly 121, and its opening / closing status is detected by a detection component 123, facilitating further automation under the central control of the control component 9.

[0035] Specifically, the compression mechanism 13 is configured as a compression cylinder, which is fixedly mounted on the support frame 6. A piston is provided at the front end of the compression cylinder and is circumferentially sealed inside the compression cylinder 11. Under the control of the control component 9, the cotton sample inside the compression cylinder 11 is compressed. The cover 122 cooperates with the piston to limit the compression of the cotton sample and form a cotton sample plug. In addition, several vent holes are provided inside the piston at a position that does not interfere with the compression cylinder. The vent holes are connected to the detection air passage 31 through a hose. The airflow on the detection air passage 31 enters the compression cylinder 11 through the vent holes inside the piston.

[0036] Specifically, the drive assembly 121 includes a drive cylinder 1211, an upper latch 1212, and a middle connecting rod 1213. The upper latch 1212 and the middle connecting rod 1213 are connected by a high-pair line contact. The middle connecting rod 1213 rotates relative to the support frame 6 around an axis. To balance the rotational inertia of the hinge with the drive cylinder 1211, a rotatable connecting rod bushing is installed between the middle connecting rod 1211 and the drive cylinder 1211. This ensures that the drive cylinder 1211 does not become dislodged from the middle connecting rod 1213 after frequent reset actions. The upper latch 1212 engages with a slot at one end of the cover 122. The cylinder push rod pushes the middle connecting rod 1213 to rotate, ultimately causing the upper latch 1212 to rotate and open the cover 122. The drive assembly 121, in conjunction with the control component 9, drives the cover 122 to automatically open after the testing process, facilitating sample replacement and the next round of testing.

[0037] Specifically, the detection component 123 is set as a Hall sensor to detect the closed state of the cover 122 in real time.

[0038] In the optional solutions of this embodiment, a more preferred option is described in the following description: Figure 8 The cover 122 has a vent hole 124, and a dustproof plate 125 is detachably provided on the side of the cover 122 away from the compression cylinder 11.

[0039] The vent holes 124 can be multiple to meet the communication requirements between the compression cylinder 11 and the atmosphere. In addition, a dustproof plate 125 is provided on the other side of the cover 122 to cover the vent holes 124 and prevent dust from clogging them. Specifically, the cover 122 is connected to the dustproof plate 125 by bolts, and there is a gap between the dustproof plate 125 and the cover 122 to avoid affecting the communication between the vent holes 124 and the atmosphere.

[0040] In the optional scheme of this embodiment, more preferably, the cotton fiber micronaire value detection device based on the mass pressure difference compensation model provided in this embodiment further includes a display component 7 and a weighing component 8. The display component 7 and the weighing component 8 are both disposed on the housing 5 and are both communicatively connected to the control component 9. The weighing component 8 is used to pre-weigh the cotton sample placed in the cotton sample compression module 1 to obtain weight information and send it to the control component 9. The display component 7 is used to display the control information of the control component 9 and can input operation commands.

[0041] The display component 7 is a control screen, which can be configured with a gas source setting interface, a calibration interface, a detection interface, and a text display interface as needed. The gas source setting interface is used to input the target pressure value and display the current gas source pressure in real time. The calibration interface has input terminals for high and low standard cotton samples, supports manual calibration data entry, and provides function keys to control the opening and closing of the cover 122. The detection interface automatically collects differential pressure signals, displays calculation results and micronaire value levels, and supports result storage and retrospective viewing. The text display interface supports human-computer interaction, process navigation, and multi-functional information feedback, improving user operation efficiency and system intelligence.

[0042] The weighing component 8 is an electronic balance located on the top of the housing 5, which can weigh the compressed cotton sample in advance to obtain the weight information of the cotton sample.

[0043] In the optional scheme of this embodiment, more preferably, the air source module 2 includes an air compressor 21 and a plurality of pressure regulating valves 22 connected in sequence along the airflow direction. The air compressor 21 and the pressure regulating valves 22 are both communicatively connected to the control component 9. The air compressor 21 is used to provide high-pressure airflow, and the plurality of pressure regulating valves 22 are used to reduce and stabilize the high-pressure airflow.

[0044] The air compressor 21 provides high-pressure gas; the pressure regulating valve 22 consists of a general pressure regulating valve and a proportional pressure regulating valve connected in series to form a two-stage pressure stabilization system. Through staged regulation, the high-pressure airflow is reduced to low-pressure airflow; the general pressure regulating valve is used to initially reduce the pressure of the high-pressure gas to no more than 0.1MPa, and the proportional pressure regulating valve performs secondary pressure reduction, so that the air pressure delivered to the air bridge air path reaches a suitable range. It receives a 0~10V analog control signal to further reduce the airflow pressure, thereby realizing the pressure stabilization function.

[0045] In the optional scheme of this embodiment, more preferably, the differential pressure detection element 4 is set as a differential pressure transmitter and connected to the air bridge circuit; the temperature sensor is located inside the differential pressure transmitter, so that the differential pressure transmitter has the functions of pressure calibration and elimination of temperature influence.

[0046] In a preferred embodiment, the control unit 9 is used to automatically control and process data during the detection process. It includes a programmable logic controller (PLC) and a host computer system. The PLC receives sensor input signals and outputs control signals to the actions of each actuator. The host computer system sets operating parameters, receives data from each sensor, and performs mass compensation calculations, temperature compensation, and micronaire value output. A communication interface module is used for data exchange between the PLC and the host computer, ensuring closed-loop execution of detection commands and feedback. This achieves fully automated control of the entire process from sampling, compression, detection, calculation, and reset, improving system efficiency and detection accuracy.

[0047] The specific operation method of the cotton fiber micronaire value detection device based on the mass pressure difference compensation model provided in this embodiment is as follows: Step 1: The operator puts a certain amount of cotton sample into the compression cylinder 11.

[0048] Step 2: Control component 9 controls compression mechanism 13 to compress the cotton sample to form a breathable plug.

[0049] Step 3: The reversing valve 36 is in the open detection state, and the airflow flows through the detection air path 31, the reference air path 32, and the differential pressure detection element 4.

[0050] Step 4: Differential pressure detection device 4 collects the differential pressure signal at both ends of the bridge circuit and transmits it to the PLC.

[0051] Step 5: The host computer reads the raw data and calls the mass compensation and temperature correction algorithm.

[0052] Step 6: Calculate and output the Micron value and its corresponding grade, record and display the results.

[0053] Step 7: Control component 9 executes the reset command, cover 122 opens, and one test is completed.

[0054] Specifically, the operator weighs 8.00g of cotton sample and places it into the compression cylinder 11. The cotton-pushing piston, driven by the compression cylinder, compresses the cotton sample along the axial direction of the compression cylinder 11 to a volume range of 50cm³, forming a standard fiber plug with a specific volume of 0.16g / cm³. After compression, the cover 122 closes and seals under the action of the drive assembly 121, ensuring the stability of the airflow path. To ensure detection efficiency, the cover 122 is provided with an array of small holes to facilitate uniform airflow discharge. After compression, the upper buckle 1212 automatically pops up the cover under the action of the drive cylinder 1211, completing one detection cycle.

[0055] The control process includes five steps: cotton sample filling, compression, reversal, detection, and reset. The entire process is coordinated and executed by the PLC, and the operation status and detection results are fed back in real time through the display component 7.

[0056] This device converts the bridge output pressure difference ΔP0 into the actual cotton sample pressure difference ΔP1 using a mathematical model, and combines this with the user-input cotton sample mass m to perform pressure difference compensation based on a mass pressure difference compensation model. The compensated air pressure difference is used to determine the micronaire value of the cotton fibers, with the system error controlled within ±0.1.

[0057] This testing method is fully automated, balancing accuracy and repeatability, and is suitable for rapid, large-scale on-site testing.

[0058] Example 2 like Figure 11 As shown, this embodiment provides a method for detecting the micronaire value of cotton fibers based on a mass pressure difference compensation model. This method is applied to the cotton fiber micronaire value detection device based on a mass pressure difference compensation model in Embodiment 1. The method includes: S1: Obtain the air pressure difference at the midpoint of the bridge; the air pressure difference at the midpoint of the bridge is acquired by a differential pressure transmitter.

[0059] S2: Based on the air pressure difference at the midpoint of the bridge, convert it into the actual air pressure difference of the cotton sample through a mathematical conversion model.

[0060] S3: Based on the actual air pressure difference of the cotton sample, the compensated air pressure difference of the cotton sample is obtained using the mass pressure difference compensation model.

[0061] S4: Determine the micronaire value of the cotton fiber in the cotton sample based on the compensated air pressure difference of the cotton sample.

[0062] In this embodiment, the formula is used Determine the micronaire value of the cotton fibers in the cotton sample. Where K1 is a constant and Mic is the micronaire value of the cotton fibers.

[0063] In the optional embodiments of this example, the preferred embodiment is the mass pressure difference compensation model as follows: ΔP 补偿 =ΔP1+k·(m-m0).

[0064] Where, ΔP 补偿 The compensated air pressure difference of the cotton sample; ΔP1 is the actual air pressure difference of the cotton sample; m is the current mass of the cotton sample being tested; m0 is the set standard mass; k is the mass-pressure difference linearity coefficient.

[0065] To achieve high-precision indirect detection of cotton fiber micronaire value, this embodiment establishes a calculation method based on bridge-type airflow pressure difference measurement and fluid-structure physical model derivation, taking into account cotton sample mass, density, porosity, and fiber morphological characteristics, thereby indirectly obtaining the product of cotton fiber fineness and maturity. The air pressure difference collected at the midpoint of the bridge path in this embodiment will serve as a key input variable reflecting the air resistance characteristics of the cotton fiber micronaire value. This value will be corrected using a subsequent compensation model, thereby achieving accurate indirect measurement of cotton fiber fineness and maturity.

[0066] It mainly includes the following two calculation stages: 1. Differential pressure measurement and correction calculation.

[0067] In the bridge structure, the pressure difference between the air paths at both ends of the cotton storage cylinder is ΔP1. The detection air path and the control air path form a symmetrical air bridge through the zero adjustment valve, air resistance, etc. The air pressure difference ΔP0 at the midpoint of the bridge path is obtained by actual measurement through the differential pressure transmitter.

[0068] Let the pressure differences of the four arms of the air bridge be P1, P2, P3, and P4, respectively, and the pressure difference at the midpoint of the bridge be ΔP0. The formula for calculating the pressure difference at the midpoint of the bridge is: .

[0069] When a certain interfering factor ΔP exists n Pressure difference at the midpoint of the air bridge path during air bridge path testing at each bridge arm: .

[0070] Let the pressure difference at the moment of entry into the air bridge be... When the pressure difference between the two bridge arms is unequal, the relationship between the pressure difference ΔP1 of the cotton storage cylinder and the output pressure difference ΔP0 at the midpoint of the air bridge can be expressed as: .

[0071] By designing the air resistance of the air bridge arm, the air bridge error can be made much smaller than ΔP. n Ideally, the pressure difference at the midpoint of the bridge circuit is unaffected by uniform external interference, and the air bridge circuit (bridge circuit) has good anti-interference capabilities and higher detection accuracy.

[0072] 2. Model for calculating the micronaire value of cotton fiber.

[0073] Based on the airflow permeation characteristics through the cotton sample compression layer, and according to the modified Kerner-Kaman permeation theory and pore structure formula, the process of collecting high and low pressure differences from the sensor and converting them into the actual pressure difference ΔP1 of the cotton sample passing through the cotton storage cylinder has been realized. By selecting the determined cotton sample mass, porosity, and volume, the relationship between the actual pressure difference of the cotton sample and the specific surface area of ​​the cotton fibers has been determined.

[0074] The formula for calculating porosity is: .

[0075] In the formula: L represents the mass of the cotton sample; L represents the fiber length; A represents the area of ​​the fiber plug. The density of the porous medium.

[0076] The specific surface area S of cotton fibers can be obtained by measuring the airflow rate Q. Since cotton fibers have an internal cavity, the modified Korenna-Karman formula can be derived as follows: .

[0077] In the formula: Q is the airflow rate; Dynamic viscosity; Porosity of the permeable medium; For cotton fibers, take the fiber constant. =1.391.

[0078] The overall volumetric density of cotton fibers (including the lumen) When the reciprocal of (the product of the two terms) is 0.75, we have: .

[0079] In the formula: H is the fineness of cotton fibers; M is the maturity ratio of cotton fibers; a, b, c, and d are constants.

[0080] An empirical formula relating cotton fiber micronaire value (Mic) to fiber fineness (H) and maturity ratio (M) is as follows: .

[0081] Given the cotton sample mass, compression volume, and a determined air flow rate, the micronaire value of the cotton fibers inside the storage cylinder is obtained using a pressure difference-micronaire value detection model: .

[0082] To address the detection error caused by sample mass fluctuations in cotton fiber micronaire value testing, this embodiment establishes a mass pressure difference compensation model based on linear regression. The model uses a standard cotton sample mass (8.00g) as a reference and sets the allowable mass fluctuation range to 7.5g~8.5g. Within this range, the system fits the linear relationship between mass change and pressure difference offset using experimental data, establishing the following compensation formula: ΔP 补偿 =ΔP1+k·(m-m0).

[0083] Among them, the mass-pressure difference linearity coefficient k is obtained by fitting multiple sets of measured pressure difference data of standard cotton samples, reflecting the degree of influence of unit mass change on pressure difference.

[0084] The sample differential pressure compensation value obtained from the mass differential pressure compensation model is the model predicted value. The differential pressure value corresponding to the cotton sample at 8.00g is the true differential pressure value of the micronaire value of the cotton sample under this condition. The absolute value of the difference between the model predicted value and the true differential pressure value reflects the accuracy of the mass differential pressure compensation model. According to the actual detection conditions, under the current gas path zero-point parameters of the instrument studied in this embodiment, the average value of the model compensation differential pressure error should not exceed 3.00Pa.

[0085] This embodiment obtains the k-value distribution by fitting the pressure difference data of standard cotton samples with different micronaire values ​​in the range of 7.5g to 8.5g. A corresponding calculation program is preset in the host computer control system, allowing the compensation model to be automatically invoked for pressure difference correction after the cotton sample mass is input during each test. Using this mass pressure difference compensation model, the detection error of non-standard quality cotton samples is reduced to ±0.1. By introducing the mass pressure difference compensation model, this embodiment significantly improves the accuracy, robustness, and ease of use of the testing device in actual acquisition and grading scenarios, solving the limitation caused by the reliance on standard quality samples in traditional testing systems.

[0086] To automate, improve efficiency, and enhance the intelligence of the cotton fiber micronaire value detection process, Example 1 provides a control module integrating a PLC, host computer, sensors, and actuators. This module coordinates the actions of each component throughout the process, acquires differential pressure signals, performs quality compensation, and outputs results, achieving closed-loop intelligent control of the detection system. The control module includes: The programmable logic controller (PLC) serves as the control core, receiving feedback signals from sensors. Pre-set instructions in the programming language control the actions of each cylinder and mechanical structure. After the device starts, the host computer outputs control commands to the PLC to each actuator cylinder, reversing valve 36, cylinder cover assembly 12, and proportional pressure regulating valve, delivering airflow with a specified differential pressure value. The cover 122 closes, and after the Hall sensor detects this, the PLC initiates the detection process. The compression mechanism 13 starts, compressing the cotton sample to a specified density of cotton fiber breathable plug. The PLC controls the reversing valve 36 to switch the cylinder, and then the differential pressure transmitter collects the air pressure difference and sends it to the PLC for processing. After a delay, the drive assembly 121 causes the cover 122 to pop up. The reversing valve 35 and the compression mechanism 13 are reset to realize the timing control of mechanical action and air circuit state switching; the host computer control system includes a human-machine interface and detection algorithm program, which is used to set operating parameters, monitor the operating status, calculate the differential pressure-mass compensation correction value and output the micronaire value of cotton fibers. By setting the grading program of the micronaire value, the level to which the detection result belongs is output; the sensor system includes differential pressure sensor, temperature sensor and Hall sensor, etc., which are used to monitor differential pressure signal, ambient temperature and cover 122 status in real time; the text display interface has three preset operation modules: proportional valve control, calibration function and cotton sample detection, which supports manual input of standard cotton sample information and display of program execution status.

[0087] Working principle: After the testing process is initiated, the user manually places the cotton sample according to the set mass range. After the cover 122 closes, the Hall sensor sends a feedback signal to the PLC. Following a preset program, the PLC receives the Hall sensor feedback signal and initiates the testing process, triggering the cylinder of the compression mechanism 13 to move forward, compressing the cotton sample to a fixed volume. The PLC then follows the next instruction, driving the reversing valve 36 via the cylinder to open the air bridge passage. Airflow smoothly passes through the reversing valve 36, the differential pressure transmitter collects data, and the PLC acquires the differential pressure signal and delays the data locking. The host computer reads the original differential pressure value, applies the differential pressure-Marklone value detection model, performs compensation model correction, outputs the test results, and displays them in stages on the display module. After the test is completed, the control module controls the compression mechanism 13 to retract, the cover 122 to open, and the reversing valve 36 to return to the closed state at both ends of the air path. The device returns to its initial state, ready for the next round of testing.

[0088] The control module of this invention realizes a closed-loop operation from cotton sample loading, compression, conduction, sampling, compensation, grading to reset through programmed management and real-time signal response of the entire detection process. This greatly improves detection efficiency, reduces human error, and enhances the adaptability and maintainability of the system.

[0089] The cotton fiber micronaire value detection device and method based on a mass pressure difference compensation model provided by this invention have the following significant technical effects: Significantly improved detection accuracy: By constructing a mass pressure difference compensation model and combining it with dynamic pressure regulation control, the problem of large detection errors for non-standard mass samples was solved. Experimental results show that the micronaire value detection error was reduced to ±0.1 after compensation, meeting the actual detection requirements for cotton purchasing and grading.

[0090] Strong anti-interference capability: The present invention adopts a symmetrical air bridge design. By optimizing the mechanical zero point parameters, it effectively shields the interference of factors such as air source fluctuations and external disturbances on the differential pressure signal, so that the differential pressure fluctuation at the midpoint of the air bridge is controlled within 0.5%, which has good field adaptability.

[0091] Automated control process: The device integrates a PLC and a host computer system, covering the entire process control of compression, conduction, detection, and flip-top reset. Combined with a human-machine interface, it realizes fully automated detection of standard cotton sample calibration, differential pressure compensation, and graded display, improving detection efficiency and reducing human error.

[0092] Compact structure and wide adaptability: The modular design of the device's mechanical structure makes it small in size and easy to integrate, suitable for on-site conditions in cotton purchasing and processing. The text-based interface is easy to use, with comprehensive functions, supporting standardized batch testing and traceability management.

[0093] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A device for detecting the micronaire value of cotton fibers based on a mass pressure difference compensation model, characterized in that: include: The cotton sample compression module (1) is used to compress the cotton sample; The air source module (2) is used to provide pressurized airflow; The air bridge circuit module (3) includes a detection air path (31) and a control air path (32) arranged in parallel. The air inlet of the detection air path (31) and the air inlet of the control air path (32) are both connected to the air source module (2) so that a pressurized airflow can be introduced. The air inlet of the cotton sample compression module (1) is connected to the detection air path (31), and the air outlet of the cotton sample compression module (1) can be connected to the atmosphere. The differential pressure detection element (4) is connected to both the outlet of the detection gas path (31) and the outlet of the control gas path (32), and is used to detect the differential pressure information between the outlet of the detection gas path (31) and the outlet of the control gas path (32). The control component (9) is communicatively connected to the differential pressure detection component (4) and can acquire the differential pressure information; the control component (9) can also acquire the weight information of the cotton sample compressed by the cotton sample compression module (1) and correct the differential pressure information according to the mass differential pressure compensation model so as to acquire the micronaire value of cotton fiber.

2. The cotton fiber micronaire value detection device based on the mass pressure difference compensation model according to claim 1, characterized in that: The air bridge circuit module (3) further includes a first air resistance component (33), a second air resistance component (34), and an adjusting component (35); the first air resistance component (33) is disposed on the detection air path (31), the second air resistance component (34) is disposed on the control air path (32), and the resistance value of the first air resistance component (33) is greater than the resistance value of the second air resistance component (34); the adjusting component (35) connects the detection air path (31) and the control air path (32), and the adjusting component (35) is used to adjust the initial air pressure of the detection air path (31) and the control air path (32) to reach a preset mechanical zero point.

3. The cotton fiber micronaire value detection device based on the mass pressure difference compensation model according to claim 1, characterized in that: The air bridge circuit module (3) also includes a reversing valve (36), which connects the detection air path (31) and the control air path (32). The reversing valve (36) can control the detection air path (31) and the control air path (32) to be connected to the differential pressure detection element (4), or control the detection air path (31) and the control air path (32) to be disconnected from the differential pressure detection element (4) and connected to the atmosphere.

4. The cotton fiber micronaire value detection device based on the mass pressure difference compensation model according to claim 1, characterized in that: The cotton sample compression module (1) includes a compression cylinder (11), a cylinder cover assembly (12), and a compression mechanism (13); the compression cylinder (11) is used to hold cotton samples, the compression mechanism (13) is movably connected to one axial side of the compression cylinder (11) and can compress the cotton samples inside the compression cylinder (11), the cylinder cover assembly (12) is located on the other side of the compression cylinder (11) away from the compression mechanism (13), and can close or open the compression cylinder (11), and the cylinder cover assembly (13) 12) After the compression cylinder (11) is closed, the compression cylinder (11) can communicate with the outside through the cylinder cover assembly (12); the compression mechanism (13) can connect the detection air path (31) and the compression cylinder (11), and the pressurized airflow can enter the compression cylinder (11) through the compression mechanism (13), flow through the cotton sample and be discharged through the air outlet; the cylinder cover assembly (12) and the compression mechanism (13) are both connected to the control component (9) in communication so as to control its operation.

5. The cotton fiber micronaire value detection device based on the mass pressure difference compensation model according to claim 4, characterized in that: It also includes a housing (5), inside which a support frame (6) is provided. The cotton sample compression module (1), the air bridge circuit module (3), and the differential pressure detection component (4) are all mounted on the support frame (6). The air source module (2) is located inside the housing (5). A through hole is provided on the housing (5) at a position opposite to the compression cylinder (11). The cylinder cover assembly (12) includes a drive assembly (121), a cover body (122), and a detection component (123). The cover body (122) is located at the through hole and is movably connected to the support frame (6). The drive assembly (121) is drivenly connected to the cover body (122). (121) is communicatively connected to the control component (9). The drive component (121) can drive the cover (122) to flip relative to the compression cylinder (11) at the through hole so as to close or open the compression cylinder (11). After the cover (122) closes the compression cylinder (11), the compression cylinder (11) can communicate with the outside through the cover (122). The detection component (123) is disposed on the cover (122) and is communicatively connected to the control component (9). The detection component (123) is used to detect the opening and closing state of the cylinder cover assembly (12) relative to the compression cylinder (11) and can send it to the control component (9).

6. The cotton fiber micronaire value detection device based on the mass pressure difference compensation model according to claim 5, characterized in that: The cover (122) has at least one vent hole (124), and a dustproof plate (125) is detachably provided on the side of the cover (122) away from the compression cylinder (11).

7. The cotton fiber micronaire value detection device based on the mass pressure difference compensation model according to claim 5, characterized in that: It also includes a display component (7) and a weighing component (8). The display component (7) and the weighing component (8) are both disposed on the housing (5) and are both connected to the control component (9). The weighing component (8) is used to weigh the cotton sample placed in the cotton sample compression module (1) in advance to obtain weight information and send it to the control component (9). The display component (7) is used to display the control information of the control component (9) and can input operation commands.

8. The cotton fiber micronaire value detection device based on the mass pressure difference compensation model according to claim 1, characterized in that: The air source module (2) includes an air compressor (21) and a plurality of pressure regulating valves (22) connected in sequence along the airflow direction. The air compressor (21) and the pressure regulating valves (22) are both communicatively connected to the control component (9). The air compressor (21) is used to provide high-pressure airflow, and the plurality of pressure regulating valves (22) are used to reduce and stabilize the high-pressure airflow.

9. A method for detecting the micronaire value of cotton fibers based on a mass pressure difference compensation model, characterized in that: The cotton fiber micronaire value detection method based on the mass pressure difference compensation model is applied to the cotton fiber micronaire value detection device based on the mass pressure difference compensation model according to any one of claims 1-8. The cotton fiber micronaire value detection method based on the mass pressure difference compensation model includes: The air pressure difference at the midpoint of the bridge path is acquired; the air pressure difference at the midpoint of the bridge path is collected by a differential pressure transmitter. Based on the air pressure difference at the midpoint of the bridge, it is converted into the actual air pressure difference of the cotton sample through a mathematical conversion model; Based on the actual air pressure difference of the cotton sample, the compensated air pressure difference of the cotton sample is obtained using the mass pressure difference compensation model. The micronaire value of the cotton fibers in the cotton sample is determined based on the compensated air pressure difference of the cotton sample.

10. The method for detecting the micronaire value of cotton fibers based on a mass pressure difference compensation model according to claim 9, characterized in that: The mass pressure difference compensation model is as follows: ΔP 补偿 =ΔP1+k·(m-m0); Where, ΔP 补偿 The compensated air pressure difference of the cotton sample; ΔP1 is the actual air pressure difference of the cotton sample; m is the current mass of the cotton sample being tested; m0 is the set standard mass; k is the mass-pressure difference linearity coefficient.

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