CN115047062B - Ultrasonic screening machine silk screen damage detection method - Google Patents
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- CN115047062B CN115047062B CN202210963628.6A CN202210963628A CN115047062B CN 115047062 B CN115047062 B CN 115047062B CN 202210963628 A CN202210963628 A CN 202210963628A CN 115047062 B CN115047062 B CN 115047062B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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Abstract
The invention relates to a method for detecting damage of a silk screen of an ultrasonic screening machine, which is characterized in that a detection ring assembly is arranged on a discharge pipe of the ultrasonic screening machine, an inductance coil is wound on a support cylinder of the assembly, a blocking silk screen is arranged in the support cylinder, a vertical magnetic field is formed at the position of the blocking silk screen after the inductance coil is electrified, target balls with higher magnetic permeability are doped in materials to be screened, the diameter of the target balls is larger than the aperture of meshes of the blocking silk screen and the screening silk screen in the ultrasonic screening machine, the aperture of the meshes of the blocking silk screen is larger than the aperture of the meshes of the screening silk screen, if the screening silk screen is damaged, the target balls can leak out from the screening silk screen and are blocked at the position of the blocking silk screen, the materials can smoothly pass through the blocking silk screen, the round target balls can bounce on the blocking silk screen, the target balls can cause the change of the magnetic field in the coil and generate electromotive force, an electromagnetic detection circuit of the detection ring assembly detects the signal and gives an alarm to prompt that the silk screen is damaged; the method has the advantages of high detection speed, high accuracy, simplicity, low detection cost and the like.
Description
Technical Field
The invention relates to the technical field of screening silk screen detection, in particular to a method for detecting damage of a silk screen of an ultrasonic screening machine.
Background
The ultrasonic screening machine is widely applied to the fields of energy storage materials such as lithium batteries, carbon powder graphite, zinc-manganese batteries and the like and micro powder materials such as medicines, foods, coatings and the like. The powder screen mesh adopted by the common ultrasonic screening machine is between 100 and 800 meshes (0.018 to 0.15 mm), and the materials and the mesh can generate severe friction in the screening process, so that the mesh breakage is a common phenomenon of the ultrasonic screening machine. If the silk screen is not found to be broken in time in the production process, coarse particles can be leaked from the broken part, and the quality of the screening material is reduced. Especially for screening of expensive materials, such as lithium metal powder materials, if the breakage of the wire mesh is not found in time, the direct application of the screening material of coarse particles which do not reach the standard will bring huge economic loss to the battery enterprises.
Ultrasonic wire mesh breakage detection is a technical problem in the fine screening production industry of micro powder materials in China. To date, the micropowder screening industry has no scientifically effective solution. The commonly used silk screen breakage detection methods include the following:
firstly, the manual sampling secondary screening method comprises the following operation processes: the screening in-process needs the staff regularly to get a small amount of finished product materials and carries out secondary screening selective examination, utilizes the visual inspection particulate matter screening condition, if the discovery has coarse grain to deposit on the silk screen, can judge that the silk screen is damaged. The method has high recognition rate and accuracy, but needs a specially-assigned person to take charge, and can not find that the materials after the last sampling inspection need to be sieved again when the silk screen is damaged, so that the sieving yield is influenced.
Secondly, a positive pressure blowing or negative pressure air suction method is based on the following principle: open a round hole on the sieve machine metal wall below the silk screen and intervene the breather pipe, when detecting the silk screen damage, at first pause the sieve machine, compressed air pours into, and electronic system detects air pressure, if detect atmospheric pressure and original damage before have obvious reduction, judge for the silk screen is damaged. The method has a certain success rate of breakage detection, but the method can fail when the breakage area of the silk screen is small or the aperture of the meshes of the silk screen is large. Meanwhile, screening production needs to be suspended during detection, and screening efficiency is affected.
And thirdly, an ultrasonic output current detection method, wherein relative to an ultrasonic power supply, a transducer, a silk screen, a net rack mechanical structure and a material with a screen form a composite load, when the silk screen is damaged, the mechanical stress of the silk screen rack can be changed, the resonance frequency of the composite load can be influenced and fed back to an ultrasonic power supply circuit, and the ultrasonic current or voltage output by the power supply can be changed. By utilizing the phenomenon, the electronic system can be utilized to carry out real-time detection on the load of the transducer, and when the silk screen is damaged, the resonant frequency of the composite load changes, so that the electronic system is triggered to alarm and a silk screen damage prompt signal is sent out. The method has certain recognition rate and accuracy on large-area damage behaviors such as glue opening and tearing of the silk screen, but can not recognize or give a false alarm when the abrasion and perforation of the central area of the silk screen are caused and the adhered matters of the micro powder of the silk screen increase due to long-time working, and the screen machine is required to be shut down during detection, so that the technical maturity of the method is low.
Other methods such as a visual observation method, a secondary ultrasonic resonance method, a photoelectric detection or image recognition method and the like can not effectively solve the problem of detection of the damage of the screen of the screening machine due to the fact that the micro-powder material is screened and produced to be in a dusty, high-temperature and high-noise environment.
Disclosure of Invention
In order to solve the problems, the invention provides a method for detecting the damage of a silk screen of an ultrasonic screening machine.
The technical scheme of the invention is as follows: a method for detecting damage of silk screen of ultrasonic screening machine comprises adopting a detection ring assembly, an ultrasonic screening machine and a round target ball; a detection ring assembly, an ultrasonic screening machine and a round target ball are adopted; the diameter of the round target ball is larger than the mesh aperture of the blocking screen and the screening screen arranged in the ultrasonic screening machine, and the mesh aperture of the blocking screen is larger than that of the screening screen; the ultrasonic screening machine is provided with a discharge pipe and a screening wire mesh; the method comprises the following steps:
(1) a detection ring component is arranged on a discharge pipe of the ultrasonic wave screen machine,
the upper end of the supporting cylinder is fixedly sleeved at the lower port of the discharge pipe, the blocking silk screen is horizontally connected to the middle of the supporting cylinder, an inductance coil of the electromagnetic detection system is wound on the outer side surface of the supporting cylinder and forms a vertical magnetic field, and the position of the inductance coil corresponds to the position of the blocking silk screen;
(2) a plurality of round target balls with high magnetic permeability are mixed in the material to be screened to form a mixed material,
(3) starting the ultrasonic screening machine, pouring the mixed material into the ultrasonic screening machine from the feeding hole, screening the mixed material on a screening wire mesh, and simultaneously synchronously vibrating the lower blocking wire mesh along with the ultrasonic screening machine;
(4) if the circular target ball leaks due to the fact that a damaged hole exists in the screening wire mesh, the circular target ball and the material can fall into a blocking wire mesh in a supporting cylinder below the discharging pipe together, the material can smoothly pass through the blocking wire mesh under the vibration of the ultrasonic screening machine, the circular target ball can be blocked by the blocking wire mesh and can jump on the blocking wire mesh, at the moment, the circular target ball can cause the magnetic field in the coil to change and generate electromotive force, and therefore the voltage at the two ends of the coil changes, the electromagnetic detection system sends out an alarm prompt to prompt that the screening wire mesh is damaged, and screening is stopped;
(5) if the screening silk screen does not have the damaged normal screening time, circular target ball is blockked on the screening silk screen, and the material can pass through the screening silk screen smoothly and block the silk screen, and electromagnetic detection system does not send the suggestion of reporting to the police, normally sieves.
Preferably, the circular target ball is coated with a high polymer acid and alkali resistant wear-resistant material for reducing the impact destructive power of the circular target ball to the barrier wire mesh, the screening wire mesh and the material.
Preferably, the round target ball is made of steel or ferrite.
Preferably, an inductance coil in the electromagnetic detection system is connected with an electromagnetic detection circuit, the circuit comprises a power supply, a detector, a low-noise low-frequency amplification circuit and a signal processing circuit, the power supply, the detector, the low-noise low-frequency amplification circuit and the signal processing circuit are connected with the inductance coil through wires, the signal processing circuit is composed of a single chip microcomputer, and the output end of the single chip microcomputer is connected with a display and an audible and visual alarm.
Preferably, the electromagnetic detection circuit is powered by a self-generating assembly, the self-generating assembly comprises a permanent magnet and a generating coil, the permanent magnet is fixed on the ultrasonic screening machine and moves up and down along with the ultrasonic screening machine, and the generating coil generates induced electromotive force and supplies power to the electromagnetic detection circuit through a rectifying and filtering circuit.
The invention has the beneficial technical effects that:
(1) The detection method is characterized in that a detection ring assembly is installed on a discharge pipe of an ultrasonic screening machine, an inductance coil is wound on a support cylinder of the assembly, a blocking screen is arranged in the support cylinder, a vertical magnetic field is formed at the position of the blocking screen after the inductance coil is electrified, a plurality of circular target balls with high magnetic permeability are doped in a material to be screened, the diameter D of each circular target ball is larger than the mesh aperture of the blocking screen and the mesh aperture of the screening screen in the ultrasonic screening machine, the mesh aperture of the blocking screen is larger than the mesh aperture of the screening screen, if the screening screen is damaged, the circular target balls can leak from the screening screen and are blocked at the position of the blocking screen, the material can smoothly pass through the blocking screen, the circular target balls jump on the blocking screen, the circular target balls can cause the magnetic field in the coil to change and generate electromotive force, an electromagnetic detection circuit of the detection ring assembly detects the signal and sends an alarm signal to prompt that the screen is damaged; the detection method can detect the minimum damaged aperture of the silk screen as the diameter of the target ball, and has the advantages of high speed, high accuracy, simple method, low cost of detection equipment and the like.
(2) Practices and applications show that the minimum diameter of a damaged hole of the silk screen detected by the method is as low as 1mm, the detection process does not need to be stopped, the detection time is less than 1 minute, the detection accuracy is 100 percent, and the phenomena of detection omission and report omission do not exist; the technical problems of the ultrasonic screening machine manufacturing industry and the micro powder fine screening production industry are thoroughly solved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention (the arrows in the figure indicate the flow direction of the material);
FIG. 2 isbase:Sub>A sectional view taken along line A-A of FIG. 1;
FIG. 3 is a sectional view taken along line B-B of FIG. 1;
FIG. 4 is a functional block diagram of an electromagnetic detection system.
In the figure, 11 is an ultrasonic screening machine, 111 is a discharge pipe, 12 is a screening screen, 121 is a damaged hole, 13 is a supporting cylinder, 14 is a blocking screen, 15 is an electromagnetic detection system, 16 is an inductance coil, and 17 is a circular target ball.
Detailed Description
In the first embodiment, referring to the attached figures 1-4 of the specification, a method for detecting the damage of a silk screen of an ultrasonic screening machine adopts a detection ring assembly, the ultrasonic screening machine and a round target ball; the detection ring assembly comprises a supporting cylinder, a blocking silk screen and an electromagnetic detection system; an inductance coil is arranged in the electromagnetic detection system; the diameter of the round target ball is larger than the mesh aperture of the screening wire mesh in the blocking wire mesh and the ultrasonic screening machine, and the mesh aperture of the blocking wire mesh is larger than the mesh aperture of the screening wire mesh. The diameter of the round target ball is the diameter of the smallest damaged hole of the screening wire mesh which can be detected; the ultrasonic screening machine is provided with a discharge pipe and a screening wire mesh; the method comprises the following steps:
(1) a detection ring component is arranged on a discharge pipe of the ultrasonic wave screen machine,
the upper end of the supporting cylinder is fixedly sleeved at the lower port of the discharge pipe, the blocking silk screen is horizontally connected to the middle of the supporting cylinder, an inductance coil of the electromagnetic detection system is wound on the outer side surface of the supporting cylinder and forms a vertical magnetic field, and the position of the inductance coil corresponds to the position of the blocking silk screen;
(2) a plurality of round target balls with high magnetic permeability are mixed in the material to be screened to form a mixed material,
the mesh aperture of the screen mesh in the common ultrasonic screening machine is between 0.018 and 0.18mm (80 to 800 meshes), the mesh aperture is far smaller than 1mm, and if the smallest damaged aperture of the screen mesh of the detection screening machine is 2 to 3mm, the diameter of the round target ball is 2 mm.
(3) Starting the ultrasonic screening machine, pouring the mixed material into the ultrasonic screening machine from the feeding hole, screening the material on the vibrating screening wire mesh, and simultaneously vibrating the blocking wire mesh in the lower supporting cylinder together with the ultrasonic screening machine;
(4) if the screening silk screen has broken holes to cause the leakage of the round target ball, the round target ball and the material fall into the blocking silk screen in the supporting cylinder together from the discharge pipe, under the strong vibration of the ultrasonic screening machine, the mixed material can smoothly pass through the blocking silk screen, the round target ball is blocked by the blocking silk screen and jumps on the blocking silk screen, at the moment, the round target ball can cause the magnetic field in the coil to change and generate electromotive force, so that the voltage at the two ends of the coil changes, the electromagnetic detection system sends out an alarm prompt to prompt that the screening silk screen is broken, and the screening is stopped;
(5) if the screening silk screen does not have the damaged normal screening time, circular target ball is blockked on the screening silk screen, and blocks that the mesh aperture of silk screen is greater than the mesh aperture of screening silk screen, therefore the material can be smoothly through the screening silk screen and block the silk screen, and electromagnetic detection system does not send the suggestion of reporting to the police, normally sieves.
The circular target ball is coated with a high polymer acid-base-resistant wear-resistant material for reducing the impact destructive power of the circular target ball on a barrier wire mesh, a screening wire mesh and materials; the round target ball is made of steel or ferrite.
An inductance coil in the electromagnetic detection system is connected with an electromagnetic detection circuit which comprises a power supply, a wave detector, a low-noise low-frequency amplification circuit and a signal processing circuit, wherein the power supply, the wave detector, the low-noise low-frequency amplification circuit and the signal processing circuit are connected with the inductance coil through wires, the signal processing circuit is composed of a single chip microcomputer, and the output end of the single chip microcomputer is connected with a display and an audible and visual alarm.
The specific circuit schematic block diagram is shown in fig. 4, in which a resistor R provides an excitation current for a detection coil, and a capacitor C couples to output an induced voltage u i (ii) a One end of the capacitor C is connected with the inductance coil, and the other end of the capacitor C is connected with one input end of the low-noise low-frequency amplifying circuit; the other end of the inductance coil is grounded with the low-noise low-frequency amplifying circuit; the output end of the low-noise low-frequency amplifying circuit is connected with the input signal end of the detector; the output end of the detector is connected with an A-D interface in the singlechip; the singlechip is respectively connected with the display and the audible and visual alarm through signals; the power supply part supplies a direct current to the coil through a resistor R and also supplies power to the wave detector, the singlechip, the display and the audible and visual alarm. The power supply part comprises a vibration self-generating component and a lithium battery, alternating current generated by the self-generating component in the working process of the ultrasonic screening machine is rectified, filtered and stabilized to charge the lithium battery, and meanwhile, a direct current power supply is provided for circuits of all parts. Because the power supply current provided by the self-generating circuit is small, the audible and visual alarm needs to be driven by large power supply current when alarming, and the driving capability of the power supply can be improved by adopting a lithium battery;
the change of magnetic field in the detecting coil will generate induced electromotive force, which is coupled via capacitor C to output u i The voltage signal is amplified and detected at low noise and low frequency to obtain DC voltage u 0 And sent to a singlechip for processing. The MCU is a singlechip with A-D inside, such as STC15F series. Setting a DC voltage u 0 The corresponding average voltage data after A-D conversion is dat; there are two situations to detect the magnetic field change in the coil; firstly, the circular target balls are prevented from jumping on the silk screen, and the change of the magnetic field in the coil is small; another one isThe circular target balls are arranged on the blocking silk screen and vibrate along with the screening machine, so that a large magnetic field change in the coil is caused. When the screening silk screen is not damaged, the magnetic field in the coil has no handle ball, and the voltage signal u is output by electromagnetic induction i Small, after detection, the DC voltage u is obtained 0 The average value is recorded as data, and the data obtained by A-D conversion and the like are small; when the screen mesh is damaged, the target ball jumps inside the detection coil u i The output amplitude is increased, so that dat data is increased, and when dat is greater than a preset value datb, a silk screen damage audible and visual alarm is triggered. datb is threshold data, in order to prevent false alarm of system, datb =2 data can be taken, data is u when the silk screen is intact i Average value after a-D conversion.
u 0 The output amplitude is generally 0-5V, the internal A-D of the singlechip is 10 bits, and then u i The data dat value range obtained after A-D conversion is 0 to (2) 10 -1). When the screen mesh is not damaged, u is measured 0 About 0.5V, and after 10-bit A-D conversion in the singlechip, the data value of about 100 is obtained, and the value of datb is about 200. When the sieving screen is broken, u 0 The voltage can reach more than 3V, the data value is more than 600 after 10-bit A-D conversion in the single chip microcomputer, and the sound-light alarm of silk screen damage can be triggered immediately after data comparison of the single chip microcomputer.
After circular target ball entered into and blocks silk screen department, inductance coils's output voltage can appear unusually, and the singlechip can judge voltage abnormity, and audible-visual annunciator sends the warning, and the damage suggestion appears in the display, and the singlechip can also take notes the normal operating time of screening silk screen simultaneously.
The electromagnetic detection circuit is powered by a self-generating assembly, the self-generating assembly comprises a permanent magnet and a generating coil, the permanent magnet is fixed on the ultrasonic screening machine and moves up and down along with the ultrasonic screening machine, and the generating coil generates induced electromotive force and supplies power to the electromagnetic detection circuit through a rectifying and filtering circuit.
The basic detection principle of the circular target ball in the step (4) is as follows:
for a horizontally placed air-core coil L, the number of turns is n, the radius is d, when the magnetic field inside the coil changes, the electromotive force epsilon is induced at the two ends of the coil, epsilon = -nd phi/dt, phi is the coil magnetic flux, phi = BS, and S is the coil area, epsilon = -nSdB/dt.
If the magnetic field of the magnetic conductive material contained in the coil is zero, a stable current I can be applied to the coil to generate a magnetic field H, so that the magnetic material is magnetized, and the magnetic induction intensity is B. When the magnetized material is at rest, dB =0, epsilon =0. When the magnetized material moves up and down, dB >0, then | ε | 0.
According to the principle, when no circular target ball exists in the inductance coil or materials with high magnetic permeability continuously and smoothly pass through the blocking silk screen (most of the materials have low magnetic permeability and cannot cause the voltage change of the inductance coil), the voltage at two ends of the inductance coil is basically constant; when the circular target balls appear on the blocking silk screen, the magnetic field in the inductance coil can change to generate electromotive force due to the vertical jumping of the circular target balls, so that the voltage at two ends of the inductance coil is changed.
Example two, an experiment was conducted using a commercially available ultrasonic sieving machine having a diameter of 1.2m, a mesh aperture of an inner sieving mesh being set to 0.048mm (300 mesh), the sieving material being a manganese dioxide battery positive electrode material, the material to be sieved containing coarse particles larger than 0.2mm, round target balls having a diameter of 2mm incorporated therein, the round target balls having a weight of 2 g and a number of about 500, and a check ring assembly to which the discharge pipe is attached having a mesh aperture of a barrier mesh of about 0.83mm (20 mesh).
During the experiment, open the material loading observation hole on ultrasonic wave sieve machine upper portion, the ultrasonic wave sieve machine starts to sieve, and electromagnetic detection circuit does not send the warning when inside screening silk screen is intact. Under the condition of not stopping the machine, in order to save the experimental time, a sharp object with the size larger than or equal to 2mm is used for puncturing a screening wire net in the ultrasonic screening machine, and after 18 seconds, an electromagnetic detection circuit sends out an alarm sound to prompt that the screening wire net is damaged and automatically sends out a signal for closing the ultrasonic screening machine. After the test is repeated for 3 times, the electromagnetic detection circuit can give out alarm sound within 30 seconds, and the detection method has the advantages of high speed, high accuracy and the like for detecting the damage of the silk screen.
Claims (5)
1. A method for detecting damage of a silk screen of an ultrasonic screening machine is characterized by comprising the following steps: a detection ring assembly, an ultrasonic screening machine and a round target ball are adopted; the detection ring assembly comprises a supporting cylinder, a blocking silk screen and an electromagnetic detection system; an inductance coil is arranged in the electromagnetic detection system; the diameter of the round target ball is larger than the mesh aperture of the blocking screen and the mesh aperture of the screening screen arranged in the ultrasonic screening machine, and the mesh aperture of the blocking screen is larger than the mesh aperture of the screening screen; the ultrasonic screening machine is provided with a discharge pipe and a screening wire mesh; the method comprises the following steps:
(1) a detection ring component is arranged on a discharge pipe of the ultrasonic wave screen machine,
the upper end of the supporting cylinder is fixedly sleeved at the lower port of the discharge pipe, the blocking silk screen is horizontally connected to the middle of the supporting cylinder, an inductance coil of the electromagnetic detection system is wound on the outer side surface of the supporting cylinder and forms a vertical magnetic field, and the position of the inductance coil corresponds to the position of the blocking silk screen;
(2) mixing a plurality of round target balls with high magnetic permeability into a material to be screened to form a mixed material;
(3) starting the ultrasonic screening machine, pouring the mixed material into the ultrasonic screening machine from the feeding hole, screening the mixed material on a screening wire mesh, and simultaneously synchronously vibrating the lower blocking wire mesh along with the ultrasonic screening machine;
(4) if the screening wire mesh is damaged, so that the circular target ball leaks, the circular target ball and the material fall into a blocking wire mesh in a lower supporting cylinder from a discharge pipe, the material can smoothly pass through the blocking wire mesh under the vibration of the ultrasonic screening machine, the circular target ball is blocked by the blocking wire mesh and jumps on the blocking wire mesh, and at the moment, the circular target ball can cause the change of an internal magnetic field of a coil and generate electromotive force, so that the voltage at two ends of the coil is changed, an electromagnetic detection system sends out an alarm prompt to prompt that the screening wire mesh is damaged, and screening is stopped;
(5) if the screening silk screen does not have the damaged normal screening time, circular target ball is blockked on the screening silk screen, and the material can be smoothly through the screening silk screen and block the silk screen, and electromagnetic detection system does not send the suggestion of reporting to the police, normally sieves.
2. The method for detecting the breakage of the silk screen of the ultrasonic screening machine according to claim 1, wherein the method comprises the following steps: the circular target ball is coated with a high polymer acid-base-resistant wear-resistant material for reducing the impact destructive power of the circular target ball on a barrier wire mesh, a screening wire mesh and materials.
3. The method for detecting the breakage of the silk screen of the ultrasonic screening machine according to claim 1, wherein the method comprises the following steps: the round target ball is made of steel or ferrite.
4. The method for detecting the breakage of the silk screen of the ultrasonic screening machine according to claim 1, wherein the method comprises the following steps: an inductance coil in the electromagnetic detection system is connected with an electromagnetic detection circuit which comprises a power supply, a wave detector, a low-noise low-frequency amplification circuit and a signal processing circuit, wherein the power supply, the wave detector, the low-noise low-frequency amplification circuit and the signal processing circuit are connected with the inductance coil through wires, the signal processing circuit is composed of a single chip microcomputer, and the output end of the single chip microcomputer is connected with a display and an audible and visual alarm.
5. The method for detecting the damage of the silk screen of the ultrasonic screening machine according to claim 4, which is characterized in that: the electromagnetic detection circuit is powered by a self-generating assembly, the self-generating assembly comprises a permanent magnet and a generating coil, the permanent magnet is fixed on the ultrasonic screening machine and moves up and down along with the ultrasonic screening machine, and the generating coil generates induced electromotive force and supplies power to the electromagnetic detection circuit through the rectifying and filtering circuit.
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| JP2012037459A (en) * | 2010-08-10 | 2012-02-23 | Sumitomo Chemical Co Ltd | Damage inspection method of screen and screen damage inspection device |
| US11448023B2 (en) * | 2019-06-23 | 2022-09-20 | Schlumberger Technology Corporation | Screen break detector |
| CN110449250A (en) * | 2019-07-23 | 2019-11-15 | 华中农业大学 | A kind of disintegrator sieving net failure evaluation device |
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| CN109975301A (en) * | 2017-12-27 | 2019-07-05 | 宝山钢铁股份有限公司 | A kind of sieve breakage detection method and detection device for blast furnace |
| CN114429544A (en) * | 2022-01-05 | 2022-05-03 | 山东工大中能科技有限公司 | Method, system and device for detecting damage of screen of vibrating screen based on computer vision |
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