Anti-static down feather sorting system and method
By employing antistatic treatment and gradient airflow sorting methods, the problems of mechanical damage and static electricity accumulation in existing down sorting processes have been solved, achieving efficient and stable separation of down from impurities and adapting to the sorting needs of different batches of down.
Patent Information
- Application Number
- CN202511897272.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-16
- Publication Date
- 2026-03-03
AI Technical Summary
Among the existing down sorting methods, mechanical sieving is prone to damaging down fibers, airflow sorting is difficult to adapt to the density differences of different batches of down and static electricity accumulation affects the sorting effect, and manual sorting is inefficient and cannot meet the needs of large-scale production.
Down raw materials are modified using an antistatic treatment process, a gradient airflow sorting space is constructed, environmental parameters are monitored in real time and the airflow speed is dynamically adjusted, and the physical property differences between down and impurities are combined for separation, and residual static electricity is eliminated through static neutralization treatment.
It improves the accuracy and efficiency of down sorting, reduces electrostatic interference, ensures the stability and precision of the sorting process, adapts to the density differences of different batches of down, and guarantees the quality of down.
Smart Images
Figure CN121589031A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of down sorting technology, specifically to an antistatic down sorting system and method. Background Technology
[0002] In the down processing industry, down sorting is a core step that determines the quality of down products. By separating down from impurities such as feather shafts and dust, pure down with high loft and low impurity content is obtained, ensuring the warmth and comfort of end products such as down jackets and down comforters. Currently, the mainstream down sorting methods mainly include mechanical sieving, airflow sorting, and manual sorting.
[0003] Among the commonly used down sorting methods, mechanical sieving relies on mechanical structures such as screens to separate down from impurities. However, mechanical contact can easily damage down fibers, and screens are prone to clogging due to electrostatic adsorption of down, reducing sorting efficiency. Airflow sorting utilizes the density difference between down and impurities, using airflow to suspend and separate down. However, in actual production, the density of down from different batches naturally varies. Factors such as down variety, loft, and moisture content can affect the density, making it difficult to adapt fixed airflow parameters to these differences, easily leading to fluctuations in sorting accuracy. At the same time, down is light, fine, and easily generates static electricity. Static electricity accumulation during sorting can cause down to clump together and adsorb impurities, further interfering with the airflow sorting effect and reducing sorting efficiency and down purity. Although manual sorting can ensure sorting accuracy, its efficiency is extremely low and cannot meet the needs of large-scale production. Summary of the Invention
[0004] The purpose of this invention is to provide an antistatic down sorting system and method to solve the problems mentioned in the background art.
[0005] The present invention achieves the above objectives through the following technical solutions: A method for sorting antistatic down feathers, comprising: S1: Obtain the down raw materials to be sorted, and modify the surface of the down raw materials using an antistatic treatment process; S2: Set up the initial sorting space and monitor the environmental parameters within the initial sorting space in real time. The environmental parameters include temperature, humidity and electrostatic voltage. Adjust the environmental parameters according to the monitoring results to form an optimized sorting space. S3: The modified down raw material is sent into the optimized sorting space. A gradient airflow from bottom to top is constructed in the optimized sorting space. The speed of the gradient airflow is dynamically adjusted according to the ratio of down settling and the ratio of impurities rising in the optimized sorting space. The down and impurities are separated by the difference in physical properties of down and impurities, and the down after preliminary sorting is collected. S4: Perform electrostatic neutralization treatment on the pre-sorted down to eliminate residual static electricity and obtain the final sorted product.
[0006] Optionally, the antistatic treatment process in step S1 is as follows: spraying or soaking the down with a bio-based antistatic agent, wherein the bio-based antistatic agent is selected from at least one of modified chitosan solution and plant-derived polysaccharide solution.
[0007] Bio-based antistatic agents have good compatibility with down fibers and can form a conductive microfilm on the down surface, reducing the coefficient of frictional charging from the source. They also leave no chemical residue or odor and do not damage the natural fluffy structure of down.
[0008] Optionally, in step S2, temperature, humidity and electrostatic voltage are monitored by a temperature sensor, a humidity sensor and an electrostatic voltage monitor, respectively. The adjustment range of environmental parameters is as follows: temperature is within the preset temperature range, humidity is within the preset humidity range, and electrostatic voltage does not exceed the preset electrostatic voltage threshold. When the electrostatic voltage exceeds the preset electrostatic voltage threshold, a micro-mist or neutral ion flow is introduced into the initial sorting space until the electrostatic voltage drops back to or below the preset electrostatic voltage threshold.
[0009] By monitoring temperature, humidity, and electrostatic voltage using dedicated sensors, the environmental conditions of the initial sorting space can be controlled. Adjusting the environmental parameters to the preset range can reduce static electricity accumulation. When the electrostatic voltage exceeds the standard, introducing micro-mist or neutral ion flow can quickly neutralize the charge, avoiding electrostatic interference with the subsequent sorting process and providing a suitable environmental basis for stable sorting.
[0010] Optionally, the sorting space can be optimized by dividing it into a bottom region, a middle region, and an upper region according to height, with the airflow velocity in the bottom region, the airflow velocity in the middle region, and the airflow velocity in the upper region increasing sequentially.
[0011] The optimized sorting space is divided into bottom, middle and upper regions according to height, and the airflow speed in each region increases sequentially from bottom to top. This gradient airflow design conforms to the physical characteristics of down and impurities, and can lay the airflow foundation for subsequent separation by utilizing the differences between the two, ensuring that down can be suspended with the airflow and impurities can settle smoothly.
[0012] Optionally, the dynamic adjustment of the gradient airflow in step S3 includes the following steps: Down settling monitoring points are set up in the optimized sorting space. When the down settling ratio is detected to exceed the preset settling ratio threshold per unit time, the airflow velocity in the bottom, middle and upper regions of the optimized sorting space will be increased. Impurity uplift monitoring points are set up in the optimized sorting space. When the proportion of impurities uplifted exceeds the preset uplift ratio threshold within a unit of time, the airflow velocity in the bottom, middle and upper regions of the optimized sorting space is reduced.
[0013] By setting up monitoring points for down settling and impurity rising, the abnormal movement ratio of the two types of materials is monitored in real time. When the ratio exceeds the threshold, the airflow speed in each area is adjusted synchronously to correct the airflow parameters in a timely manner, so as to avoid excessive settling of down or excessive rising of impurities due to improper airflow, thus ensuring the sorting accuracy and stability.
[0014] Optionally, the adjustment formula for the gradient airflow is as follows: v new =v init +Δv×k adjust； In the above formula, v init The initial airflow velocity is given by k (m / s), Δv is the preset adjustment step size (m / s), and k is the initial airflow velocity. adjust This is for adjusting the coefficient.
[0015] The explicit gradient airflow adjustment formula links the initial airflow velocity, the preset adjustment step size, and the adjustment coefficient, providing a quantitative and operable calculation basis for the dynamic adjustment of airflow velocity.
[0016] Optionally, the difference in physical properties in step S3 is a difference in density; The process of separating down from impurities by utilizing the differences in their physical properties is as follows: Down feathers, due to their low density, are suspended by gradient airflow to the middle and upper parts of the optimized sorting space, where they are collected by a negative pressure collection device. Impurities, due to their high density, settle to the bottom of the optimized sorting space and are collected through the collection trough.
[0017] Using density differences as the basis for separating down from impurities, combined with gradient airflow design, the low-density down is suspended in the upper middle part by the airflow and collected by the negative pressure collection device, while the high-density impurities settle to the bottom and are collected by the collection trough, thus achieving the separation of down from impurities.
[0018] Optionally, the electrostatic neutralization process in step S4 is as follows: the pre-sorted down is sent into an ultrasonic field, and positive and negative ion flows are simultaneously introduced into the ultrasonic field.
[0019] After initial sorting, the down is sent into an ultrasonic field and a flow of positive and negative ions is introduced. The ultrasonic waves can break up the clumps of down through vibration, allowing the ion flow to fully contact the surface of the down, thereby neutralizing residual static electricity and preventing the down from adsorbing impurities during subsequent storage or processing, thus ensuring the quality of the final down product.
[0020] Optionally, in steps S1-S4, the electrostatic voltage data of the down surface is collected in real time. When the electrostatic voltage exceeds the preset electrostatic voltage threshold in any step and continues for a preset duration, the sorting process is paused. The sorting process is restarted after the environmental parameters are adjusted to ensure that the electrostatic voltage does not exceed the preset electrostatic voltage threshold.
[0021] The system collects static voltage data on the surface of down feathers in real time. When the static voltage exceeds the standard, the process is paused and restarted after the parameters are adjusted to meet the standard. This enables static control of the entire sorting process, preventing the sorting effect or down quality from being affected by excessive static voltage at any stage, and ensuring that the sorting process is stable and controllable.
[0022] An antistatic down sorting system includes: Pre-processing module: used to obtain the down raw materials to be sorted and to modify the surface of the down raw materials using an anti-static treatment process; Sorting Space Construction Module: Used to build the initial sorting space, monitor environmental parameters within the initial sorting space in real time, including temperature, humidity and electrostatic voltage, and adjust the environmental parameters according to the monitoring results to form an optimized sorting space; Down sorting module: It is used to send the modified down raw materials into the optimized sorting space, construct a gradient airflow from bottom to top in the optimized sorting space, and dynamically adjust the speed of the gradient airflow according to the ratio of down settling and impurities rising in the optimized sorting space. It separates down and impurities by utilizing the difference in physical properties, and collects the down after preliminary sorting. Post-processing module: Used to neutralize static electricity in the initially sorted down feathers, eliminate residual static electricity, and obtain the final sorted product.
[0023] The beneficial effects of this invention are as follows: By constructing a bottom-up gradient airflow and dynamically adjusting the airflow speed based on the down settling ratio and the impurity rising ratio, separation is achieved by utilizing the density difference between down and impurities: down, due to its low density, is suspended by the gradient airflow and collected in the upper part of the optimized sorting space, while impurities, due to their high density, settle to the bottom and are collected. Dynamically adjusting the airflow speed can adapt to the density differences of different batches of down, avoiding fluctuations in sorting accuracy caused by fixed airflow parameters, thus improving the accuracy and efficiency of sorting. When excessive down settling and excessive impurities floating occur, the "environmental parameter retest command" is triggered to re-monitor and specifically adjust and optimize the environmental parameters in the sorting space. This process enhances the adaptability of the entire sorting system to complex situations and ensures the sorting effect. In steps S1-S4, electrostatic voltage data of the down surface is collected in real time. This allows for real-time capture of changes in electrostatic intensity at each step, preventing undetected excessive electrostatic discharge at a particular step from affecting subsequent sorting processes and ensuring stable sorting accuracy throughout the entire process. Attached Figure Description
[0024] Figure 1 A flowchart provided for Embodiment 1 of the present invention; Figure 2 The flowchart provided is for Embodiment 2 of the present invention. Detailed Implementation
[0025] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.
[0026] Example 1 Refer to the instruction manual appendix Figure 1 This embodiment discloses an antistatic down sorting method, including: S1: Obtain the down raw materials to be sorted, and use an antistatic treatment process to modify the surface of the down raw materials to suppress static electricity generated by friction during the subsequent sorting process.
[0027] As a preferred embodiment, the antistatic treatment process in step S1 involves spraying or soaking the down with a bio-based antistatic agent. The bio-based antistatic agent is selected from at least one of modified chitosan solution and plant-derived polysaccharide solution. The bio-based antistatic agent has good compatibility with down fibers, can form a conductive microfilm on the down surface, reducing the triboelectric coefficient from the source, and leaves no chemical residue or odor, without damaging the natural fluffy structure of the down.
[0028] The antistatic treatment process involves controlling the processing temperature at 10-20℃ and the processing time at 15-30 minutes. After treatment, the down is drained until the moisture content is ≤15%. This antistatic treatment process pre-treats the down raw materials, which can suppress the static electricity generated by friction during subsequent sorting.
[0029] S2: Set up the initial sorting space and monitor the environmental parameters within the initial sorting space in real time. The environmental parameters include temperature, humidity and electrostatic voltage. Adjust the environmental parameters according to the monitoring results to form an optimized sorting space.
[0030] It should be noted that in step S2, temperature, humidity and electrostatic voltage are monitored using a temperature sensor, a humidity sensor and an electrostatic voltage monitor, respectively.
[0031] The environmental parameters can be adjusted as follows: temperature within a preset temperature range, humidity within a preset humidity range, and electrostatic voltage not exceeding a preset electrostatic voltage threshold. As a preferred option, the preset temperature range is 15-25℃, the preset humidity range is 45-60%, and the preset electrostatic voltage threshold is 300V. Setting the temperature within the 15-25℃ range and the humidity within the 45-60% range reduces air resistance and minimizes static electricity buildup. It should be noted that the preset temperature range, preset humidity range, and preset electrostatic voltage threshold are all set based on historical experience or industry standards.
[0032] When the electrostatic voltage exceeds the preset electrostatic voltage threshold (i.e., when the electrostatic voltage exceeds 300V), a micro-mist or neutral ion stream is introduced into the initial sorting space, with droplet size ≤10μm, until the electrostatic voltage drops back to or below the preset electrostatic voltage threshold. The micro-mist and neutral ion stream can quickly neutralize the free charge in the space, avoiding electrostatic interference with the sorting process.
[0033] As a preferred option, the inner wall of the sorting space is coated with a conductive ceramic material. The conductive ceramic coating material can conduct away the static electricity generated in the space in real time, helping to maintain a low static electricity environment in the space.
[0034] S3: The modified down raw material is fed into the optimized sorting space, where a gradient airflow is constructed from bottom to top, and the down settling ratio P within the optimized sorting space is determined. down The ratio of impurities to float P up The speed of the gradient airflow is dynamically adjusted, and the down and impurities are separated by the difference in physical properties. The down after preliminary sorting is then collected.
[0035] The optimized sorting space is divided into a bottom region, a middle region, and an upper region according to height, with the airflow velocity in the bottom region, the middle region, and the upper region increasing sequentially.
[0036] As a preferred embodiment, the velocity range of the gradient airflow in step S3 is 0.5-1.2 m / s, wherein the airflow velocity at the bottom of the optimized sorting space (0-1 / 4 height) is 0.5-0.7 m / s, the airflow velocity in the middle of the optimized sorting space (1 / 4-2 / 3 height) is 0.7-1.0 m / s, and the airflow velocity in the upper part of the optimized sorting space (2 / 3-top) is 1.0-1.2 m / s.
[0037] The modified down raw material is introduced from the lower middle part of the optimized sorting space, specifically between 1 / 4 and 2 / 3 of the height from the bottom of the optimized sorting space.
[0038] Dynamically adjusting gradient airflow includes the following steps: Down settling monitoring points were set up within the optimized sorting space. When the proportion of down settling P was detected within a unit time (within 1 minute), the monitoring was conducted. down When the preset settling ratio threshold is exceeded, the airflow velocity in the bottom, middle and upper regions of the sorting space will be increased. The preset settling ratio threshold is set to 5%, the preset adjustment step size is 0.1 m / s, and the adjusted airflow velocity will be maintained in the range of 0.5-0.7 m / s, 0.7-1.0 m / s in the middle region, and 1.0-1.2 m / s in the upper region. Within the optimized sorting space, impurity floating monitoring points are set up. When the proportion P of impurities floating within a unit time (1 minute) is detected, the monitoring points are set accordingly. up When the airflow velocity exceeds the preset upward floating ratio threshold, the airflow velocity in the bottom, middle and upper regions of the sorting space will be reduced. The preset upward floating ratio threshold is set to 3%, the preset adjustment step is 0.1m / s, and the adjusted airflow velocity will be maintained in the range of 0.5-0.7m / s, 0.7-1.0m / s in the middle region, and 1.0-1.2m / s in the upper region.
[0039] Specifically, the down settling monitoring point is set at a height of 1 / 3 from the top of the optimized sorting space. Monitoring employs a combination of dual-sided through-beam sensors and a smart counter. Specifically, the transmitting end uses a Banner S186E infrared through-beam sensor, installed on the left wall of the monitoring point, and the receiving end uses a Banner S186R infrared through-beam sensor, correspondingly installed on the right wall. The two are perfectly aligned to form a horizontal monitoring plane covering the entire cross-section of the sorting space. The sensors are arranged in a 10-channel array with 5cm spacing along the vertical direction (the specific spacing is determined by the actual height of the optimized sorting space and can be adjusted to ensure that all 10 sensors fall completely within the vertical range of the monitoring point area). A Delta DTC1000C smart counter is used, with a built-in direction discrimination algorithm that only identifies downward-moving obstruction signals. The downward-moving obstruction signal is determined by the sensor triggering sequence being "from top to bottom." When the upper sensor is triggered first, followed by the lower sensor, it is determined to be down settling. The total duration of obstruction by down settling within 1 minute is recorded as T. 沉 (S), through formula P down =T 沉 Calculate the settlement ratio by dividing by 60 and multiplying by 100%. For example, if the cumulative shading time is 3 seconds within 1 minute, then P... down =5%; The impurity uplift monitoring point is set at a height of 1 / 4 of the bottom of the optimized sorting space. Monitoring uses the same dual-sided through-beam sensor and intelligent counter combination as the down settling monitoring. The transmitter is installed on the front sidewall of the monitoring point, and the receiver is installed on the rear sidewall. A 10-channel array is distributed vertically at 5cm intervals (the specific interval is determined by the actual height of the optimized sorting space and can be adjusted to ensure that all 10 sensors fall completely within the vertical range of the monitoring point area). The Delta DTC1000C intelligent counter has a built-in direction discrimination algorithm that only identifies upward-moving obstruction signals. These upward-moving obstruction signals are determined by the sensor triggering sequence being "from bottom to top." When the lower sensor is triggered first, followed by the upper sensor, it is determined to be an uplifted impurity. The total duration of obstruction by uplifted impurities within 1 minute is recorded as T. 浮 (S), through formula P up =T 浮Calculate the upward adjustment ratio by dividing by 60 and multiplying by 100%. For example, if the cumulative occlusion is 1.8 seconds within 1 minute, then P... up =3%.
[0040] As a preferred embodiment, the physical property difference in step S3 is a density difference, wherein the density of down is 0.2-0.4 g / cm³. 3 The density of the impurities is 1.0-2.0 g / cm³. 3 Specifically, the density of feather stalks in the impurities is 1.0-1.3 g / cm³. 3 The dust density in the impurities is 1.5-2.0 g / cm³. 3 The process of separating down and impurities by utilizing the differences in their physical properties is as follows: Down, due to its low density, is suspended in the upper part of the optimized sorting space by a gradient airflow and collected by a negative pressure collection device; impurities, due to their high density, settle to the bottom of the optimized sorting space and are collected by a collection trough. Dynamically adjusting the airflow speed can accommodate the density differences of different batches of down, avoiding fluctuations in sorting accuracy caused by fixed airflow parameters. It should be noted that during down sorting, the optimized sorting space, negative pressure collection device, and collection trough must be kept as a completely sealed environment.
[0041] The adjustment formula for gradient airflow is as follows: v new =v init +Δv×k adjust； In the above formula, v init The initial airflow velocity is Δv (m / s), Δv is the preset adjustment step size (0.1m / s), and k is the initial airflow velocity. adjust For adjustment coefficients; If P down >5% indicates excessive down settling, at which point k adjust =1, to increase the gradient airflow velocity; If P up >3% indicates that too many impurities have floated to the surface; at this point, k adjust =-1, to reduce gradient airflow velocity; If P down >5% and P up If the value is greater than 3%, then kadjust = 0, triggering the "environmental parameter retest command". Using the temperature sensor, humidity sensor, and electrostatic voltage monitor installed in step S2, the environmental parameters in the optimized sorting space are re-monitored. Based on the re-monitoring results, the environmental parameters in the optimized sorting space are adjusted accordingly. After the environmental parameters in the optimized sorting space are adjusted, the system is allowed to stabilize for 10 minutes before recalculating P. down and P up .
[0042] Specifically, adjusting and optimizing the environmental parameters in the sorting space based on the results of the re-monitoring includes the following steps: If the temperature is >25℃ or <15℃, adjust the temperature to 15-25℃; if the humidity is >60% or <45%, adjust the humidity to 45-60%; if the static voltage is >300V, adjust the static voltage to ≤300V.
[0043] Furthermore, a filter screen with a pore size of 0.1-0.3mm is installed at the air inlet of the negative pressure collection device to intercept tiny feather fragments that enter with the airflow.
[0044] S4: Perform electrostatic neutralization treatment on the pre-sorted down to eliminate residual static electricity and obtain the final sorted product.
[0045] As a preferred method, the electrostatic neutralization treatment is as follows: the pre-sorted down is sent into an ultrasonic field. The ultrasonic field is a low-frequency ultrasonic field with a frequency of 20-40kHz. The low-frequency ultrasound breaks up the down clumps by vibration, allowing the ion flow to fully contact the down surface, neutralizing residual static electricity, and preventing the down from adsorbing impurities during subsequent storage or processing. At the same time, positive and negative ion flows are introduced into the ultrasonic field. The treatment time is 5-10 minutes, and the specific time is adjusted according to the clumping rate. When the clumping rate is <2%, 5 minutes is used, and when the clumping rate is >2%, 10 minutes is used.
[0046] The formulas for calculating the intensity of positive and negative ion currents are as follows: ; In the above formula, I0 is the basic ion current intensity, which is taken as 0.5 mA, and U res U is the residual static voltage (V) of down feathers. limit The target electrostatic voltage is 300V.
[0047] Furthermore, in steps S1-S4, the electrostatic voltage data of the down surface is collected in real time. When the electrostatic voltage continues for a preset duration exceeding the preset electrostatic voltage threshold (300V) in any step, the sorting process is paused. The sorting process is restarted after the environmental parameters are adjusted to ensure that the electrostatic voltage does not exceed the preset electrostatic voltage threshold (≤300V), so as to ensure that the electrostatic voltage is within a controllable range throughout the process. The preset duration here is 5 seconds.
[0048] Example 2 Refer to the instruction manual appendix Figure 2 This embodiment discloses an antistatic down sorting system, comprising: Pre-processing module: used to obtain the down raw materials to be sorted and to modify the surface of the down raw materials using an anti-static treatment process; Sorting Space Construction Module: Used to build the initial sorting space, monitor environmental parameters within the initial sorting space in real time, including temperature, humidity and electrostatic voltage, and adjust the environmental parameters according to the monitoring results to form an optimized sorting space; Down sorting module: It is used to send the modified down raw materials into the optimized sorting space, construct a gradient airflow from bottom to top in the optimized sorting space, and dynamically adjust the speed of the gradient airflow according to the ratio of down settling and impurities rising in the optimized sorting space. It separates down and impurities by utilizing the difference in physical properties, and collects the down after preliminary sorting. Post-processing module: Used to neutralize static electricity in the initially sorted down feathers, eliminate residual static electricity, and obtain the final sorted product.
[0049] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.
Claims
1. A method for sorting antistatic down feathers, characterized in that, include: S1: Obtain the down raw materials to be sorted, and modify the surface of the down raw materials using an antistatic treatment process; S2: Set up an initial sorting space and monitor the environmental parameters within the initial sorting space in real time. The environmental parameters include temperature, humidity, and electrostatic voltage. Adjust the environmental parameters according to the monitoring results to form an optimized sorting space. S3: The modified down raw material is fed into the optimized sorting space. A gradient airflow from bottom to top is constructed in the optimized sorting space. The speed of the gradient airflow is dynamically adjusted according to the ratio of down settling and the ratio of impurities rising in the optimized sorting space. Down and impurities are separated by the difference in physical properties. The down after preliminary sorting is collected. S4: Perform electrostatic neutralization treatment on the pre-sorted down to eliminate residual static electricity and obtain the final sorted product.
2. The antistatic down sorting method according to claim 1, characterized in that, The antistatic treatment process in step S1 is as follows: spraying or soaking the down with a bio-based antistatic agent, wherein the bio-based antistatic agent is selected from at least one of modified chitosan solution and plant-derived polysaccharide solution.
3. The antistatic down sorting method according to claim 1, characterized in that, The optimized sorting space is divided into a bottom region, a middle region, and an upper region according to height, and the airflow velocity in the bottom region, the middle region, and the upper region increases sequentially.
4. The antistatic down sorting method according to claim 3, characterized in that, Step S3, which involves dynamically adjusting the gradient airflow, includes the following steps: Down settling monitoring points are set up in the optimized sorting space. When the down settling ratio is detected to exceed the preset settling ratio threshold per unit time, the airflow velocity in the bottom, middle and upper regions of the optimized sorting space is increased. Impurity uplift monitoring points are set up in the optimized sorting space. When the proportion of impurities uplifted exceeds the preset uplift ratio threshold within a unit time, the airflow velocity in the bottom, middle and upper regions of the optimized sorting space is reduced.
5. The antistatic down sorting method according to claim 4, characterized in that, The adjustment formula for the gradient airflow is as follows: v new =v init +Δv×k adjust； In the above formula, v init The initial airflow velocity is given by k (m / s), Δv is the preset adjustment step size (m / s), and k is the initial airflow velocity. adjust This is for adjusting the coefficient.
6. The antistatic down sorting method according to claim 3, characterized in that, The difference in physical properties mentioned in step S3 is a difference in density; The process of separating down from impurities by utilizing the differences in their physical properties is as follows: Down feathers, due to their low density, are suspended by gradient airflow to the middle and upper parts of the optimized sorting space, where they are collected by a negative pressure collection device. Impurities, due to their high density, settle to the bottom of the optimized sorting space and are collected through the collection trough.
7. The antistatic down sorting method according to claim 1, characterized in that, The electrostatic neutralization process described in step S4 is as follows: the pre-sorted down feathers are sent into an ultrasonic field, and positive and negative ion flows are simultaneously introduced into the ultrasonic field.
8. The antistatic down sorting method according to claim 1, characterized in that, In steps S1-S4, electrostatic voltage data of the down surface is collected in real time. When the electrostatic voltage exceeds the preset electrostatic voltage threshold in any step and continues for a preset duration, the sorting process is paused. The sorting process is restarted after the environmental parameters are adjusted to ensure that the electrostatic voltage does not exceed the preset electrostatic voltage threshold.
9. An antistatic down sorting system, characterized in that, include: Pre-processing module: used to obtain the down raw materials to be sorted and to modify the surface of the down raw materials using an anti-static treatment process; Sorting Space Construction Module: Used to build the initial sorting space, monitor the environmental parameters within the initial sorting space in real time, including temperature, humidity and electrostatic voltage, and adjust the environmental parameters according to the monitoring results to form an optimized sorting space; Down sorting module: It is used to send the modified down raw materials into the optimized sorting space, construct a gradient airflow from bottom to top in the optimized sorting space, and dynamically adjust the speed of the gradient airflow according to the down settling ratio and the impurity floating ratio in the optimized sorting space. It separates down and impurities by utilizing the difference in physical properties, and collects the down after preliminary sorting. Post-processing module: Used to neutralize static electricity in the initially sorted down feathers, eliminate residual static electricity, and obtain the final sorted product.