Metal wire cleanliness evaluation device

Abstract

The utility model relates to the technical field of metal wire cleanliness evaluation, in particular to a metal wire cleanliness evaluation device. The utility model discloses a device for evaluating the cleanliness of a metal wire. The device comprises a charge unit and an electrostatic deflection unit which are arranged in sequence, the charge unit comprises a corona wire and a tubular cathode plate, and the corona wire is located at the axial center position of the tubular cathode plate; the electrostatic deflection unit comprises an anode plate and a cathode plate, and the anode plate and the cathode plate are oppositely arranged in parallel and are perpendicular to the ground. According to the device for evaluating the cleanliness of the metal wire, particles adsorbed on the surface of the metal wire are charged through the charging unit, and the metal wire containing the charged particles enters the electrostatic deflection unit and deflects under the action of electric field force; the quantitative relation between the cleanliness and the charge capacity and the silk thread quality, the deflection angle and the electric field intensity is established based on the electrostatic principle, the cleanliness index is defined, and quantitative evaluation of the surface cleanliness of the metal silk thread is achieved.

Description

Technical Field

[0001] This utility model relates to the field of metal wire cleanliness evaluation technology, and more specifically, to a metal wire cleanliness evaluation device. Background Technology

[0002] Metal wire is a thin, elongated metallic material that can be made from a single metal or an alloy. During the production process, the surface of metal wire easily attracts micro-dust particles, which can become embedded within the wire or remain on its surface, thus degrading its performance. The cleanliness of the metal wire surface directly affects the quality and reliability of the final product.

[0003] Currently, the main method for evaluating the surface cleanliness of metal wires is macroscopic visual inspection using a stereomicroscope. This method requires highly experienced personnel, allows only qualitative evaluation, and can only visually inspect the outermost layer of metal wires on the spool. This limits the number of samples that can be tested, making it difficult to comprehensively assess the overall cleanliness of the metal wires. Furthermore, because the test results rely on the operator's experience and judgment, there may be significant subjective errors, affecting the accuracy and consistency of the results.

[0004] In view of the above, this utility model is hereby proposed. Utility Model Content

[0005] The purpose of this invention is to provide a metal wire cleanliness evaluation device that can achieve continuous quantitative evaluation of the surface cleanliness of metal wires.

[0006] In order to achieve the above-mentioned objectives of this utility model, the following technical solution is adopted:

[0007] This utility model provides a device for evaluating the cleanliness of metal wires, including a charging unit and an electrostatic deflection unit arranged in sequence.

[0008] The charged unit includes a corona wire and a tubular cathode plate, wherein the corona wire is located at the axial center of the tubular cathode plate;

[0009] The electrostatic deflection unit includes an anode plate and a cathode plate, which are arranged parallel to each other and perpendicular to the ground.

[0010] Furthermore, the radius of the corona wire is 0.1–0.15 cm;

[0011] And / or, the length of the corona wire is greater than or equal to the length of the tubular cathode plate.

[0012] Furthermore, the inner radius of the tubular cathode plate is 1 to 2 cm;

[0013] And / or, the length of the tubular cathode plate is 100-200 mm.

[0014] Furthermore, in the charged unit, the center distance between the metal wire and the corona wire is 0.35 to 0.45 cm.

[0015] Furthermore, the metal wire cleanliness evaluation device also includes a first power supply, which is used to apply a voltage of 14 to 31 kV to the charging unit.

[0016] Furthermore, it includes at least one of the following features (1) to (3);

[0017] (1) The width of the anode plate and the cathode plate is 10-30 cm;

[0018] (2) The height of the anode plate and the cathode plate is 10-50cm;

[0019] (3) The vertical distance between the anode plate and the cathode plate is 2 to 3 cm.

[0020] Furthermore, the metal wire cleanliness evaluation device also includes a second power supply, which is used to apply a voltage of 20 to 100 kV to the electrostatic deflection unit.

[0021] Furthermore, the corona wire of the charged unit is connected to the positive terminal of the first power supply, and the tubular cathode plate of the charged unit is connected to the negative terminal of the first power supply.

[0022] And / or, the anode plate of the electrostatic deflection unit is connected to the positive terminal of the second power supply, and the cathode plate of the electrostatic deflection unit is connected to the negative terminal of the second power supply.

[0023] Furthermore, the metal wire cleanliness evaluation device also includes a moving unit; the moving unit includes a pay-off shaft, a tension wheel, a first guide wheel, a drive wheel, a second guide wheel, and a take-up shaft arranged in sequence; the charging unit is disposed between the first guide wheel and the drive wheel, and the electrostatic deflection unit is disposed between the drive wheel and the second guide wheel.

[0024] Furthermore, the cleanliness evaluation device for metal wires includes a quantitative evaluation unit, which includes a camera and a computer.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0026] The metal wire cleanliness evaluation device provided by this utility model uses a charging unit designed based on the corona effect to saturate the particles on the surface of the metal wire with charge, and an electrostatic deflection unit that can flexibly adjust the deflection angle of the charged wire. Based on the electrostatic principle, a quantitative relationship is established between cleanliness, charge, wire mass, deflection angle, and electric field strength, and a cleanliness index is defined to achieve comparison and quantitative evaluation of the surface cleanliness of wires of different materials and diameters. The designed charging unit and electrostatic deflection unit are compact and small, making it easy to integrate and install at the rear end of annealing and wire drawing equipment. With the wire take-up and unwinding mechanism, continuous quantitative evaluation of the surface cleanliness of the metal wire can be achieved. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the metal wire cleanliness evaluation device of this utility model.

[0029] Figure 2 This is a schematic diagram of the charged unit of this utility model.

[0030] Figure 3 This is a schematic diagram of the deflection of the metal wire in the electrostatic deflection unit of this utility model, and a force analysis diagram of the metal wire in the electrostatic deflection unit.

[0031] Figure label:

[0032] 11-Corona wire; 12-Tube cathode plate

[0033] 21-Anode plate; 22-Cathode plate;

[0034] 3-First power supply; 4-Second power supply;

[0035] 51-Payout spool; 52-Tension wheel;

[0036] 53-First guide wheel; 54-Drive wheel;

[0037] 55 - Second guide roller; 56 - Take-up spool;

[0038] 61-Camera; 62-Computer;

[0039] 7-Metal wire. Detailed Implementation

[0040] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are only some embodiments of this utility model, not all embodiments, and are only used to illustrate this utility model, and should not be regarded as limiting the scope of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] Reference Figure 1 This utility model provides a metal wire cleanliness evaluation device, including a charging unit and an electrostatic deflection unit arranged in sequence;

[0043] The charged unit includes a corona wire 11 and a tubular cathode plate 12, with the corona wire 11 located at the axial center of the tubular cathode plate 12;

[0044] The electrostatic deflection unit includes an anode plate 21 and a cathode plate 22, which are arranged in parallel relative to each other and perpendicular to the ground.

[0045] The cleanliness evaluation device for metal wires of this invention utilizes the corona effect to ionize local air in the charging unit, causing the particles adsorbed on the surface of the metal wire to become charged. When the metal wire containing charged particles enters the electrostatic deflection unit and passes through a uniform electric field, the metal wire will deflect under the action of the electric field force. The deflection angle is related to the charge of the particles on the surface of the metal wire, the electric field strength, and the mass of the metal wire in the uniform electric field region. Therefore, the cleanliness of the surface of the metal wire can be quantitatively evaluated through the relevant indicators of the deflection angle of the metal wire.

[0046] The charging unit, designed based on the corona effect, saturates the particles on the surface of the metal wire with charge, while the electrostatic deflection unit can flexibly adjust the deflection angle of the charged wire. Based on the electrostatic principle, a quantitative relationship is established between cleanliness, charge, wire mass, deflection angle, and electric field strength, defining cleanliness indicators and enabling comparison and quantitative evaluation of the surface cleanliness of wires of different materials and diameters. The designed charging unit and electrostatic deflection unit are compact and small, allowing the device to be integrated into the back end of wire drawing or annealing equipment, enabling continuous quantitative evaluation of the surface cleanliness of the metal wire.

[0047] In some embodiments, the corona wire 11 of the charged unit and the tubular cathode plate 12 are coaxial.

[0048] In some embodiments, the radius (a) of the corona wire 11 is 0.1 to 0.15 cm; for example, the radius of the corona wire 11 can be 0.1 cm, 0.125 cm, 0.15 cm, etc.

[0049] In some embodiments, the length of the corona wire 11 is greater than or equal to the length of the tubular cathode plate 12.

[0050] In some implementations, the corona wire 11 is made of stainless steel.

[0051] In some embodiments, the corona wire 11 has a circular cross-sectional shape.

[0052] In some embodiments, the inner radius (b) of the tubular cathode plate 12 is 1 to 2 cm; for example, the inner radius of the tubular cathode plate 12 can be 1 cm, 1.5 cm, 2 cm, etc.

[0053] In some embodiments, the length (l) of the tubular cathode plate 12 c The length of the tubular cathode plate 12 can be 100mm, 120mm, 140mm, 160mm, 180mm, 200mm, etc.

[0054] In some embodiments, the thickness of the tubular cathode plate 12 is 1 to 3 mm; for example, the thickness of the tubular cathode plate 12 can be 1 mm, 2 mm, 3 mm, etc.

[0055] In some embodiments, the tubular cathode plate 12 is made of stainless steel or aluminum alloy.

[0056] In some implementations, the tubular cathode plate 12 is grounded.

[0057] See Figure 2In some embodiments, the center distance (x) between the metal wire 7 and the corona wire 11 in the charged unit is 0.35 to 0.45 cm; for example, the center distance between the metal wire 7 and the corona wire 11 in the charged unit can be 0.35 cm, 0.4 cm, 0.45 cm, etc.

[0058] In some embodiments, the metal wire cleanliness evaluation device further includes a first power supply 3, which is used to apply a voltage of 14 to 31 kV to the charging unit; for example, the voltage applied to the charging unit can be 14 kV, 20 kV, 25 kV, 31 kV, etc.

[0059] See Figure 2 In the charged cell, the local air near the corona wire 11 is ionized, resulting in corona discharge and generating a large number of electrons and positive ions. Free electrons are immediately attracted to the corona wire 11 (positive electrode) and lose their charge, while positive ions move towards the tubular cathode plate 12 under the influence of the electric field, filling the space between the two electrodes. When the metal wire 7 adsorbing the particles enters the charged cell at a certain speed, the positive ions encounter the particles and attach to them, making the particles positively charged.

[0060] In some implementations, in the charged cell:

[0061] The length of the tubular cathode plate 12 is l c ; In the formula, v is the moving speed of the metal wire, in m / s; τ is the charging time constant, in s.

[0062] The voltage applied to the charged cell is U c ; In the formula, M is the surface roughness coefficient of the corona wire 11; δ is the relative density of the gas; a is the radius of the corona wire 11 in cm; b is the inner radius of the tubular cathode plate 12 in cm.

[0063] In the formula, A is the Hamaker constant between the metal wire and the particle; d p λ is the equivalent diameter of the particle, in meters (m); x is the center distance between the metal wire and the corona wire, in centimeters (cm); Z is the distance between the particle and the surface of the metal wire, in nanometers (nm); q s This represents the saturated charge of the particle, expressed in C.

[0064] DC voltage U applied to the charged cell c The design of the inner radius b of the tubular cathode plate 12 and the radius a of the corona wire 11 should ensure that the electric field strength E generated on the surface of the corona wire is sufficient. a Greater than the corona electric field strength E c This causes air ionization near corona line 11, i.e., U c>30Maδ(1+0..3aδlnb / a,kV;where M is the surface roughness coefficient of the corona wire 11, and M=1 for a smooth corona wire (conductor); δ is the relative density of the gas.

[0065] For example, for a = 0.1 cm, b = 1 cm, M = 1, δ = 1, U c A voltage greater than 13.4kV is sufficient to meet the corona discharge requirements.

[0066] Charge of a single particle in the electric field of a charged unit Where, ε r ε is the relative permittivity of the particles, typically taken as 2 to 8, where ε r The value is 5; ε0 is the vacuum permittivity, which is 8.85 × 10⁻⁶. -12 C 2 / N·m;d p U is the equivalent diameter of the particle, in meters. c τ is the DC voltage applied by the first power source 3 between the corona wire 11 and the tubular cathode plate 12, in kV; b is the inner radius of the tubular cathode plate 12, in cm; a is the radius of the corona wire 11, in cm; x is the center distance between the metal wire and the corona wire 11, in cm; τ is the charging time constant, in s. Where N0 is the ion density, ions / m³ 3 e represents the electron charge, 1.6 × 10⁻⁶. -19 C; K represents ion mobility, m 2 / s·V; Under atmospheric temperature conditions, the typical distribution of N0 and K is taken as N0 = 5 × 10 14 pcs / m 3 K = 2.2 × 10 -4 m 2 If the charge-time constant is τ = 0.002 s, then the particle is saturated with charge when t ≥ 10τ, i.e., q p ≈q s ;q s For particles to be saturated with charge, Design the length l of the tubular cathode plate of the charged unit. c The moving speed v of the metal wire satisfies the saturation charge requirement of the particles, that is... At the same time, the voltage U is regulated c The electric field force F on the particle e Not greater than the van der Waals gravitational force F. v ,in, Where A is the Hamaker constant between the metal wire and the particle; Z is the distance between the particle and the surface of the metal wire, typically effective between 0.4 and 10 nm, usually Z is taken as 0.4 nm; that is, it is required that...

[0067] In some embodiments, the anode plate 21 and cathode plate 22 of the electrostatic deflection unit are arranged vertically.

[0068] In some embodiments, the width of the anode plate 21 and the cathode plate 22 is 10 to 30 cm; for example, the width of the anode plate 21 and the cathode plate 22 can be 10 cm, 15 cm, 20 cm, 25 cm, 30 cm, etc.; the width of the anode plate 21 and the cathode plate 22 is the same.

[0069] In some embodiments, the height of the anode plate 21 and the cathode plate 22 is 10 to 50 cm; for example, the height of the anode plate 21 and the cathode plate 22 can be 10 cm, 20 cm, 30 cm, 40 cm, 50 cm, etc.; the height of the anode plate 21 and the cathode plate 22 is the same.

[0070] In some embodiments, the vertical distance between the anode plate 21 and the cathode plate 22 is 2 to 3 cm; for example, the vertical distance between the anode plate 21 and the cathode plate 22 can be 2 cm, 2.5 cm, 3 cm, etc.

[0071] In some embodiments, the thickness of the anode plate 21 and the cathode plate 22 of the electrostatic deflection unit is 1 to 3 mm, respectively; for example, the thickness of the anode plate 21 and the cathode plate 22 can be 1 mm, 2 mm, 3 mm, etc., respectively; the thickness of the anode plate 21 and the cathode plate 22 is the same.

[0072] In some embodiments, the anode plate 21 and cathode plate 22 of the electrostatic deflection unit are made of stainless steel.

[0073] In some embodiments, the metal wire cleanliness evaluation device further includes a second power supply 4, which is used to apply a voltage of 20 to 100 kV to the electrostatic deflection unit; for example, the voltage applied to the electrostatic deflection unit can be 20 kV, 40 kV, 60 kV, 80 kV, 100 kV, etc.

[0074] In some implementations, the voltage applied to the electrostatic deflection unit is U. e ;

[0075] In the formula, D is the vertical distance between the anode plate 21 and the cathode plate 22 of the electrostatic deflection unit, in cm.

[0076] Applying voltage U e It is affected by the structural parameters of the charged unit and the distance D between the plates of the deflection unit.

[0077] The electrostatic deflection unit includes two vertically arranged, parallel electrode plates. One end is connected to the positive terminal of the power supply, serving as the anode plate 21, and the other end is connected to the negative terminal of the power supply and grounded, serving as the cathode plate 22. The distance between the anode and cathode plates is D, and the DC voltage applied between the anode and cathode plates by the second power supply 4 is U. e This results in a uniform electric field being generated between the anode and cathode plates. To prevent particles from escaping the metal wire's adsorption, the uniform electric field should not exceed the electric field strength at the location of the metal wire within the charged unit, i.e.

[0078] See Figure 3 The metal wire 7, which adsorbs particles, enters the electrostatic deflection unit after passing through the charging unit, causing the metal wire 7 to hang down naturally in a U-shape. Then, the second power supply 4 supplies a high DC voltage to the electrostatic deflection unit, and the hanging metal wire 7 is simultaneously subjected to an electric field force F. e Gravity and supporting force cause the object to deflect and maintain a certain deflection angle α.

[0079] In some embodiments, the corona wire 11 of the charged unit is connected to the positive terminal of the first power supply 3, and the tubular cathode plate 12 of the charged unit is connected to the negative terminal of the first power supply 3.

[0080] In some embodiments, the anode plate 21 of the electrostatic deflection unit is connected to the positive terminal of the second power supply 4, and the cathode plate 22 of the electrostatic deflection unit is connected to the negative terminal of the second power supply 4.

[0081] In some implementations, the first power supply 3 and the second power supply 4 include a DC / DC boost module.

[0082] The DC / DC boost module outputs high-voltage DC power. Specifically, it generates low-voltage pulses through high-frequency oscillation, then boosts the voltage to a predetermined value through a pulse transformer, and finally obtains high-voltage DC power through pulse rectification. The first power supply 3 and the second power supply 4 supply power to the charging unit and the electrostatic deflection unit, respectively, and are independently controlled.

[0083] In some implementations, the input terminals of the first power supply 3 and the second power supply 4 are supplied with a voltage of 12-24V to ensure personnel safety.

[0084] In some embodiments, the metal wire cleanliness evaluation device further includes a moving unit; the moving unit includes a pay-off shaft 51, a tension wheel 52, a first guide wheel 53, a drive wheel 54, a second guide wheel 55 and a take-up shaft 56 arranged in sequence; a charging unit is disposed between the first guide wheel 53 and the drive wheel 54, and an electrostatic deflection unit is disposed between the drive wheel 54 and the second guide wheel 55.

[0085] In some embodiments, the moving unit also includes a servo motor drive, and the pay-off shaft 51, take-up shaft 56 and drive wheel 54 are driven by the servo motor.

[0086] The pay-off spool, take-up spool, and drive wheel are driven by a servo motor, and the tension wheel provides pay-off tension; the parts of the pay-off spool, take-up spool, guide wheel, and drive wheel that contact the surface of the metal wire are provided with an insulating coating.

[0087] In some embodiments, the cleanliness evaluation device for metal wires further includes a quantitative evaluation unit, which includes a camera 61 and a computer 62.

[0088] Camera 61 is used to take pictures of the deflection of the metal wire to obtain an image; computer 62 is used to process the image and calculate the deflection angle of the metal wire to obtain the corresponding cleanliness.

[0089] In some implementations, the metal wire includes bonding wire.

[0090] The metal wire cleanliness evaluation device of this invention can quantitatively evaluate the cleanliness of the bonding wire surface. By integrating the device into the back end of the wire drawing or annealing equipment, continuous quantitative evaluation of the cleanliness of the bonding wire surface can be achieved.

[0091] The cleanliness of metal wires is evaluated using the aforementioned metal wire cleanliness evaluation device, specifically including the following steps:

[0092] The metal wire moves at a certain speed and enters the charging unit sequentially through the wire feeding shaft 51, tension wheel 52 and first guide wheel 53. The metal wire moves in a direction parallel to the corona wire 11 and passes through the charging unit. During the process of passing through the charging unit, the particles on the surface of the metal wire become saturated and charged.

[0093] Then, it enters the electrostatic deflection unit, and the pay-off shaft 51 and the drive wheel 54 are adjusted to rotate synchronously. The take-up shaft 56 is stationary, and the second guide wheel 55 is also stationary. This allows the metal wire in the electrostatic deflection unit to hang down naturally in a U-shape, positioned in the middle of the anode plate 21 and the cathode plate 22. The metal wire is simultaneously subjected to electric field force, gravity, and support force in the uniform electric field of the electrostatic deflection unit, causing it to deflect and keeping the metal wire stable at a certain deflection angle.

[0094] The camera 61 takes pictures of the deflection of the metal wires in the electrostatic deflection unit to obtain images; the computer 62 processes the images to calculate the deflection angle of the metal wires; and the cleanliness of the metal wires is evaluated based on the deflection angle.

[0095] After the evaluation is completed, the second power supply 4 is turned off. The take-up spool 56, the pay-off spool 51, and the drive wheel 54 rotate synchronously, maintaining a consistent linear speed, and the evaluated section of metal wire is wound onto the take-up spool. At this time, the new section of metal wire has been saturated with charge by the charging unit. The pay-off spool 51 and the drive wheel 54 are adjusted to rotate synchronously, while the take-up spool 56 remains stationary. The second guide wheel 55 also remains stationary, allowing the metal wire in the electrostatic deflection unit to hang naturally in a U-shape. The second power supply 4 is turned on, and the section of metal wire is positioned between the anode plate 21 and the cathode plate 22, entering the uniform electric field deflection zone formed by the anode and cathode plates, where it is deflected. The camera 61 and computer 62 continue to perform quantitative evaluation on this section of metal wire. By repeating the above process, continuous overall evaluation of the metal wire can be achieved.

[0096] The cleanliness of metal wires is evaluated based on the cleanliness index Cl. The higher the Cl value, the worse the cleanliness of the metal wires.

[0097] in, In the formula, Cl is a cleanliness index, with units of C / m³. 2 ;d w ρ is the diameter of the metal wire, in μm; ρ is the density of the metal wire, in g / cm³. 3 g is the acceleration due to gravity, with units of m / s². 2 D is the vertical distance between the anode plate 21 and the cathode plate 22 of the electrostatic deflection unit, in cm; α is the deflection angle of the metal wire; U e The DC voltage applied between the anode plate 21 and the cathode plate 22 of the electrostatic deflection unit is expressed in kV.

[0098] Based on the corona effect and electrostatic principle, metal wire particles are charged and deflected. By defining a cleanliness index Cl and establishing a quantitative relationship between cleanliness, charge, wire mass, deflection angle, and electric field strength, the surface cleanliness of the wire can be quantitatively evaluated. The formula for the cleanliness index Cl considers the influence of wire material, diameter, and length on cleanliness, enabling the comparison and evaluation of the cleanliness of wires with different materials, diameters, and lengths.

[0099] See Figure 3 After the metal wire surface is saturated with adsorbed microparticles in the charging unit, it enters the electrostatic deflection unit. The pay-off shaft 51 and drive wheel 54 rotate synchronously, while the take-up shaft 56 remains stationary, causing the metal wire 7 within the electrostatic deflection system to hang naturally in a U-shape, positioned between the two parallel electrode plates. A high voltage U is applied to the two electrode plates. e Due to the adsorption of positively charged particles, this section of metal wire 7 is simultaneously subjected to an electric force F in a uniform electric field. e The balance of gravity and supporting force will keep the metal wire 7 stable at a certain deflection angle α.

[0100] According to the force analysis diagram, Fe =Gtanα, then Where G is the weight of the drooping metal wire; l d q is the length of the metal wire in the deflection region; t d represents the total charge of the metal wire; n represents the number of particles, and the charge of the metal wire is proportional to the number of particles; w Let ρ be the diameter of the metal wire; ρ be the density of the metal wire. In the metal wire cleanliness evaluation device, the more particles adsorbed on the surface of the metal wire, and the larger the particle size, the greater the total charge. For metal wires of the same diameter and length, a larger total charge indicates a worse cleanliness. According to the charge formula, the total charge is also related to the length l of the metal wire. d and diameter d w Regarding the evaluation of the cleanliness of metal wires of different diameters and lengths, it can be expressed as the charge per unit surface area of ​​the metal wire. Where A W =πd w l d , where is the surface area of ​​the metal wire in the deflection zone; the larger the charge per unit surface area (Cl), the worse the cleanliness of the metal wire surface. Therefore, a cleanliness index can be defined. Quantitatively evaluate the surface cleanliness of metal wires.

[0101] The deflection region is a uniform electric field region formed by the anode and cathode plates, which deflects the charged metal wire. The length l of the metal wire in the deflection region is... d This refers to the length of the U-shaped metal wire between the parallel anode and cathode plate regions, i.e. Figure 3 The length of the medium metal wire 7.

[0102] In some implementations, in the charged cell:

[0103] The first power source 3 applies a DC voltage U to the charged unit. c The voltage ranges from 14 to 31 kV.

[0104] The radius 'a' of the corona wire 11 is 0.1–0.15 cm;

[0105] The length of the corona wire 11 is 120-240 mm, which is greater than or equal to the length of the tubular cathode plate 12.

[0106] The inner radius b of the tubular cathode plate 12 is 1 to 2 cm;

[0107] The length l of the tubular cathode plate 12 c 100-200mm;

[0108] The center distance x between the metal wire and the corona wire 11 is 0.35 to 0.45 cm.

[0109] In some implementations, the electrostatic deflection unit includes:

[0110] The second power source 4 applies a DC voltage U between the anode plate 21 and the cathode plate 22 of the electrostatic deflection unit. e The voltage range is 20–100 kV.

[0111] The width w of the anode plate 21 and the cathode plate 22 is 10-30 cm; preferably 10-20 cm.

[0112] The height h of the anode plate 21 and the cathode plate 22 is 10-50 cm; preferably 10-30 cm.

[0113] The vertical distance D between the anode plate 21 and the cathode plate 22 is 2-3 cm.

[0114] Voltage U applied to the charged unit c The value of U depends on the values ​​of a, b, and x. When a = 0.1 cm, the value of U is different when b = 1 cm and x = 0.35–0.45 cm. c The value ranges from 14 to 24 kV; for b = 2 cm, U c The voltage range is 19–31 kV; to ensure saturated charging of the particles, the charging time needs to be in the range of 0.02–0.06 s. Considering the ease of equipment integration and installation, the moving speed of the metal wire is controlled between 0.1 and 3 m / s, and the length of the tubular cathode plate is l. c Within the range of 100–200 mm; the aforementioned key structural parameters of the charged unit can guarantee the equivalent diameter d of the particle. p For particles smaller than 10 μm, saturation charging is achieved; in the electrostatic deflection unit, the width of the parallel plates is 10–30 cm, the height is 10–50 cm, the plate spacing is 2–3 cm, and a voltage U is applied. e The voltage ranges from 20 to 100 kV, which is influenced by the structural parameters of the charged unit and the distance D between the plates of the deflection unit. This ensures that the uniform electric field strength between the parallel plates in the deflection region does not exceed the electric field strength at the metal wire of the charged unit.

[0115] In some implementations, the specific parameter settings in the metal wire cleanliness evaluation device are shown in Table 1.

[0116] Table 1

[0117]

[0118]

[0119] Although the present invention has been illustrated and described with specific embodiments, it should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it; those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, without departing from the spirit and scope of the present invention; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention; therefore, this means that all such substitutions and modifications that fall within the scope of the present invention are included in the appended claims.

Claims

1. A wire line cleanliness evaluation device characterized by comprising: The charging unit and the electrostatic deflection unit are arranged in sequence. The charging unit comprises a corona wire and a tubular cathode plate, and the corona wire is located at the axial center of the tubular cathode plate. The electrostatic deflection unit comprises an anode plate and a cathode plate, and the anode plate and the cathode plate are arranged in parallel and perpendicularly to the ground.

2. The wire cleanliness evaluation device according to claim 1, characterized by The radius of the corona wire is 0.1-0.15 cm. And / or, the length of the corona wire is greater than or equal to the length of the tubular cathode plate.

3. The wire cleanliness evaluation apparatus according to claim 1, characterized by The inner radius of the tubular cathode plate is 1-2 cm. And / or, the length of the tubular cathode plate is 100-200 mm.

4. The wire cleanliness evaluation apparatus according to claim 1, characterized by In the charging unit, the center distance between the metal wire and the corona wire is 0.35-0.45 cm.

5. The wire cleanliness evaluation apparatus according to claim 1, characterized by The metal wire cleanliness evaluation device further comprises a first power supply, which is used to apply a voltage of 14-31 kV to the charging unit.

6. The wire cleanliness evaluation apparatus according to claim 1, characterized by The metal wire cleanliness evaluation device comprises at least one of the following features (1)-(3): (1) The width of the anode plate and the cathode plate is 10-30 cm. (2) The height of the anode plate and the cathode plate is 10-50 cm. (3) The vertical distance between the anode plate and the cathode plate is 2-3 cm.

7. The wire cleanliness evaluation apparatus according to claim 5, wherein The metal wire cleanliness evaluation device further comprises a second power supply, which is used to apply a voltage of 20-100 kV to the electrostatic deflection unit.

8. The wire cleanliness evaluation apparatus according to claim 7, characterized by The corona wire of the charging unit is connected to the positive electrode of the first power supply, and the tubular cathode plate of the charging unit is connected to the negative electrode of the first power supply. And / or, the anode plate of the electrostatic deflection unit is connected to the positive electrode of the second power supply, and the cathode plate of the electrostatic deflection unit is connected to the negative electrode of the second power supply.

9. The wire cleanliness evaluation apparatus according to claim 1, characterized by The metal wire cleanliness evaluation device further comprises a moving unit, which comprises a pay-off shaft, a tension wheel, a first guide wheel, a drive wheel, a second guide wheel and a take-up shaft arranged in sequence.

10. The wire cleanliness evaluation device of claim 1, wherein The metal wire cleanliness evaluation device comprises a quantitative evaluation unit, which comprises a camera and a computer.

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