CN112885559B - Magnetic force forming equipment for preparing electromagnetic shielding sealing strip - Google Patents
Magnetic force forming equipment for preparing electromagnetic shielding sealing strip Download PDFInfo
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- CN112885559B CN112885559B CN202110338815.0A CN202110338815A CN112885559B CN 112885559 B CN112885559 B CN 112885559B CN 202110338815 A CN202110338815 A CN 202110338815A CN 112885559 B CN112885559 B CN 112885559B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/20—Electromagnets; Actuators including electromagnets without armatures
- H01F7/202—Electromagnets for high magnetic field strength
- H01F7/204—Circuits for energising or de-energising
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC
- H02M5/04—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters
- H02M5/22—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/25—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M5/257—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Coating With Molten Metal (AREA)
- Regulation Of General Use Transformers (AREA)
Abstract
The invention discloses magnetic force forming equipment for preparing electromagnetic shielding sealing strips, which comprises an electric control cabinet, a machine case, a semi-closed magnetic yoke, a conductive coil and a height adjusting component, wherein a bridge rectifier, a transformer, a touch screen, an ammeter, a silicon controller and a PLC (programmable logic controller) are arranged in the electric control cabinet, the machine case is semi-coated with the semi-closed magnetic yoke, the semi-closed magnetic yoke is in a nearly C shape and comprises an upper magnetic yoke, a lower magnetic yoke and a connecting magnetic yoke which are horizontally arranged, the height adjusting component comprises a positioning frame, a guide rod guide sleeve component, a screw rod screw sleeve component and a distance adjusting plate movably connected with the lower end of a screw rod.
Description
Technical Field
The invention relates to the technical field of electromagnetic shielding sealing strip production, in particular to magnetic force forming equipment for preparing an electromagnetic shielding sealing strip.
Background
The electromagnetic shielding sealing strip or the electromagnetic shielding gasket is used as an electronic product sealing material and an electromagnetic shielding material, is widely accepted in the market, is mainly applied to the fields of automotive machines, radars, power amplifiers, military industry, communication base stations, high-frequency signal shielding and the like, is made of more silica gel materials, is doped with tiny particles or flaky ferromagnetic conductive particles, and is magnetized by utilizing the magnetization effect of a magnetic field, so that the ferromagnetic conductive particles obtain magnetizing effect, all the ferromagnetic conductive particles generate weak magnetic poles, then adjacent two ferromagnetic conductive particles attract each other in opposite poles, all the ferromagnetic conductive particles are positioned according to the direction of magnetic induction lines and are solidified and shaped, and after the electromagnetic shielding sealing strip is applied to electronic products, electromagnetic signals transmitted by the electromagnetic sealing strip in the traditional use through gaps can be completely shielded after the directional shaping. The electromagnetic shielding sealing strip or the electromagnetic shielding gasket is rarely seen in the market at present, and the special production and preparation equipment is also absent, so that the application prospect is wide.
Therefore, as the production of the novel electromagnetic shielding sealing strip, ferromagnetic conductive particles are required to be uniformly oriented through magnetization in a magnetic field before forming, and the electromagnetic shielding sealing strip is immediately shaped after being magnetized, so that the unshaped sealing strip material is required to be subjected to preliminary shaping through a magnetization process, and therefore, an adsorption device capable of assisting the electromagnetic shielding sealing strip in preliminary shaping is required to be designed.
Disclosure of Invention
The invention aims to provide adsorption equipment capable of assisting an electromagnetic shielding sealing strip in preliminary shaping, so that ferromagnetic conductive particles in an electromagnetic shielding strip formed by dispensing can be uniformly oriented after magnetization, electromagnetic signals transmitted through gaps are fully shielded, and the electromagnetic interference problem of the existing electromagnetic shielding strip is solved.
The technical scheme adopted for solving the problems is as follows:
A magnetic force forming device for preparing electromagnetic shielding sealing strips comprises an electric control cabinet, a machine case, a semi-closed magnetic yoke, a conductive coil and a height adjusting component.
The electric control cabinet is internally provided with a bridge rectifier, a transformer, a touch screen, an ammeter, a silicon controlled rectifier and a PLC controller which are used for conducting direct current to the conductive coil and controlling the power supply current of the conductive coil and the fault alarm reminding,
The chassis is partly covered by a semi-closed magnetic yoke, the semi-closed magnetic yoke is of a nearly C shape, the semi-closed magnetic yoke comprises an upper magnetic yoke, a lower magnetic yoke and a connecting magnetic yoke which is vertically arranged at the rear end, the rear end of the upper magnetic yoke surrounds the upper half section of the conductive coil, the rear end of the lower magnetic yoke surrounds the lower half section of the conductive coil, the middle section of the connecting magnetic yoke surrounds the middle section of the conductive coil, so that the conductive coil after being electrified generates a magnetic field in the nearly C shape, the direction of magnetic induction is conducted to the S pole of the upper magnetic yoke by the N pole of the lower magnetic yoke in a uniform vertical direction, the electromagnetic shielding strips before solidification on a feeding conveying belt between the upper magnetic yoke and the lower magnetic yoke are magnetized, irregular ferromagnetic conductive particles in the electromagnetic shielding strips are attracted to form N poles and S pole back heteropoles for orientation, the back end face of the upper magnetic yoke is tightly attached to the front end face of the connecting magnetic yoke, the upper magnetic yoke and the lower magnetic yoke is controlled by a height adjusting assembly to be lifted for adjusting the distance between the upper magnetic yoke and the lower magnetic yoke according to the requirements of uniform orientation and shaping of the electromagnetic shielding strips with different specifications and sizes,
The upper end and the lower end of the conductive coil are connected with the bridge rectifier in parallel and then connected with the ammeter in series, the input end of the bridge rectifier is electrically connected with the transformer, a resistor and a capacitor are connected in series between the transformer and the main loop for filtering and straightening, a control switch of a controllable silicon is connected in parallel outside the resistor and the capacitor for regulating voltage and limiting current so that the conductive coil obtains a required current value,
The height adjusting assembly is arranged above the upper magnetic yoke and comprises a positioning frame, guide rod guide sleeve assemblies, a screw rod threaded sleeve assembly and a distance adjusting plate movably connected with the lower end of the screw rod, wherein the guide rod guide sleeve assemblies are arranged on two sides of the positioning frame, the threaded sleeve is fixed in the middle of the positioning frame, the screw rod is vertically arranged after being in threaded fit with the threaded sleeve, the lower end of the screw rod is movably connected with the distance adjusting plate, the distance adjusting plate is fixedly connected with the upper end face of the upper magnetic yoke, the distance adjusting plate and the upper magnetic yoke are driven to lift and adjust the distance up and down under the rotating fit of the screw rod threaded sleeve, and a locking frame, a U-shaped hole bracket and a locking bolt are arranged between the rear end of the upper magnetic yoke and the supporting frame and used for guaranteeing the tight fit of the upper magnetic yoke and the connecting magnetic yoke and ensuring the stable magnetic flux conduction.
Further, the electromagnetic shielding sealing strip is magnetized by a magnetic field generated by the semi-closed magnetic yoke, and the section of the electromagnetic shielding sealing strip is approximately delta-shaped or approximately inverted U-shaped.
Further, a dust cover is arranged above the positioning frame and used for isolating dust.
Further, the rear ends of the upper magnet yoke and the lower magnet yoke are also overlapped and provided with dust-proof plates.
Further, the lower end of the lower magnetic yoke is also provided with a foot pad for supporting and positioning the magnetic force forming equipment.
Further, an exhaust fan is arranged at one side in the case, air is introduced from an air inlet at the other side of the case, and the heating value of the conductive coil in the case is extracted along with the wind, so that the conductive coil is cooled.
The beneficial effects of the invention are as follows:
1. The magnetic force forming equipment for preparing the electromagnetic shielding sealing strip can control the magnetic flux intensity of a magnetic field to pull ferromagnetic conductive particles by means of the magnitude of current;
2. After the current parameters and the magnetic yoke spacing parameters are regulated and controlled, a plurality of groups of sampling training is carried out, and mathematical modeling fitting is carried out by using a linear regression model, so that the electric control parameters of the electromagnetic shielding strips corresponding to the size parameters to be magnetized and uniformly oriented can be rapidly obtained;
3. the electromagnetic shielding sealing strip with the cross section of nearly delta or nearly U-shaped orientation is obtained according to the magnetic force intensity generated by the current intensity, so that the applicability is wide;
4. The electromagnetic shielding strip can be shaped on line and rapidly, so that the electromagnetic shielding strip formed by dispensing is supplied continuously to the conveyor belt for magnetization orientation, and the production efficiency is high;
5. The electromagnetic shielding strip formed by dispensing has extremely small initial shape and size limitation and extremely good universality.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below.
Fig. 1 is a schematic structural view of a magnetic force molding apparatus for manufacturing an electromagnetic shielding sealing strip according to the present embodiment;
FIG. 2 is an exploded view of the magnetic force molding apparatus according to the present embodiment;
FIG. 3 is a perspective view of the magnetic force molding apparatus according to the present embodiment;
FIG. 4 is a rear side view of the magnetic force molding apparatus according to the present embodiment;
FIG. 5 is a left side view of the magnetic force molding apparatus according to the present embodiment;
FIG. 6 is a schematic view showing the electromagnetic shielding sealing strip in the initial state, in the approximately delta-shaped posture and in the approximately inverted U-shaped posture according to the embodiment;
Fig. 7 is a schematic diagram of a master control circuit of the electric control cabinet according to the embodiment;
FIG. 8 is an electrical schematic diagram of the exhaust fan control circuit and the PLC controller according to the embodiment;
FIG. 9 is an electrical schematic diagram of the touch screen, the transformer and the A/D converter according to the embodiment;
fig. 10 is a photograph showing an initial state of the electromagnetic shielding sealing strip according to the present embodiment;
FIG. 11 is a photograph showing the electromagnetic shielding sealing strip in the nearly U-shaped posture according to the present embodiment;
fig. 12 is a photograph of the electromagnetic shielding sealing strip of the present embodiment in a nearly delta-shaped posture;
FIG. 13 is a graph of a fitted curve of data for magnetic force current and distance variation;
FIG. 14 is a graph of residual analysis of a magnetic force based regression type fitting process;
FIG. 15 is a plot of data scatter plot of magnetic force current and distance variation;
FIG. 16 is a graph of a fit of current I to aspect ratio η under conditions of an upper magnetic field spacing of 90 mm;
FIG. 17 is a graph of a fit of current I to aspect ratio η under conditions of an upper magnetic field spacing of 120 mm;
FIG. 18 is a graph of a fit of current I to aspect ratio η under conditions of an upper magnetic field spacing of 150 mm;
The electromagnetic shielding sealing device comprises a 1-electric control cabinet, a 2-alarm indicator lamp, a 3-case, a 4-dust cover, a 5-air inlet, a 6-front foot pad, a 7-lower magnetic yoke, an 8-upper magnetic yoke, a 9-locating frame, a 10-guide rod guide sleeve assembly, an 11-screw rod screw sleeve assembly, a lower half section of a 12-conductive coil, an upper half section of a 13-conductive coil, a 14-exhaust fan, a 15-conductive coil middle section, a 16-adjusting plate, a 17-supporting frame, a 18-rear foot pad, a 19-dust-proof plate, a 20-locking support, a 21-connecting magnetic yoke, a 22-locking bolt, a 23-locking frame, an electromagnetic shielding sealing strip in a 24-initial state, an electromagnetic shielding sealing strip in a nearly-U-shaped posture, an electromagnetic shielding sealing strip in a nearly-delta-shaped posture and 27-ferromagnetic conductive particles.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Examples:
referring to fig. 1-9, the present embodiment provides a magnetic force forming apparatus for preparing an electromagnetic shielding sealing strip, which includes an electric control cabinet 1, a chassis 3, a semi-closed magnetic yoke, a conductive coil and a height adjusting component.
The electric control cabinet 1 is internally provided with a bridge rectifier, a transformer, a Weilon touch screen, a ZW1619-S ammeter, a silicon controlled rectifier AP01, an A/D converter and a PLC controller based on the model of the ohm dragon CP1H-XA40DR-A, which is used for conducting direct current to the conductive coil, controlling the power supply current of the conductive coil and alarming and reminding faults,
An exhaust fan 14 is arranged at one side in the case 3, air is introduced from an air inlet 5 at the other side of the case 3, the heat of a conductive coil in the case 3 is extracted along with the wind, the conductive coil is cooled, the case 3 is half-covered by a half-closed magnetic yoke which is in a nearly C shape as a whole and comprises an upper magnetic yoke 8, a lower magnetic yoke 7 and a connecting magnetic yoke 21 which is vertically arranged at the rear end, wherein the rear end of the upper magnetic yoke 8 surrounds a half section 13 of the conductive coil, the rear end of the lower magnetic yoke 7 surrounds a lower half section 12 of the conductive coil, the middle section of the connecting magnetic yoke 21 surrounds a middle section 15 of the conductive coil, the conductive coil which is electrified generates a magnetic field in a nearly C shape, the direction of a magnetic induction wire is conducted to the S pole of the upper magnetic yoke 8 from the N pole of the lower magnetic yoke 7 in a uniform vertical direction, the electromagnetic shielding strip before curing on a feeding conveying belt between the upper magnetic yoke 8 and the lower magnetic yoke 7 is magnetized, the irregular ferromagnetic conductive particles 27 in the electromagnetic shielding strips form N pole and S pole which are attracted to orient, even the adjacent two magnetized ferromagnetic conductive particles 27 are attracted to each other end to end, so as to form a totally-enclosed shielding structure with mutually connected inside, the rear end surface of the upper magnetic yoke 8 is tightly attached to the front end surface of the connecting magnetic yoke 21, and is controlled by a height adjusting component to lift up and down, so as to adjust the interval between the upper magnetic yoke 8 and the lower magnetic yoke 7 according to the requirement that the electromagnetic shielding strips with different specification sizes are subjected to uniform orientation and sizing, the rear ends of the upper magnetic yoke 8 and the lower magnetic yoke 7 are also overlapped and provided with dust-proof plates 19, the lower magnetic yoke 7 is integrally fixedly connected with the connecting magnetic yoke 21, the lower end of the lower magnetic yoke 7 is also provided with foot pads, including a front foot pad 6 and a rear foot pad 18, thereby supporting and positioning the magnetic force forming equipment.
Referring to fig. 7, the upper end and the lower end of the conductive coil are connected in parallel with a bridge rectifier, and then connected in series with a ZW1619-S ammeter, the input end of the bridge rectifier is electrically connected with a transformer, a resistor R01 and a capacitor C01 are connected in series between the transformer and the main loop for filtering and straightening, and control switches V01 and V02 of a thyristor AP01 are also connected in parallel outside the resistor R01 and the capacitor C01 for voltage regulation, so that the conductive coil obtains a required current value.
The height adjusting assembly is arranged above the upper magnetic yoke 8 and comprises a positioning frame 9, a guide rod guide sleeve assembly 10, a screw rod threaded sleeve assembly 11 and a distance adjusting plate movably connected with the lower end of the screw rod, a dust cover 4 is further arranged above the positioning frame 9 and used for isolating dust, the guide rod guide sleeve assembly 10 is arranged on two sides of the positioning frame 9, the threaded sleeve is fixed in the middle of the positioning frame 9, the screw rod is vertically arranged after being in threaded fit with the threaded sleeve, the lower end of the screw rod is movably connected with the distance adjusting plate, the distance adjusting plate is fixedly connected with the upper end face of the upper magnetic yoke 8, the screw rod threaded sleeve is rotatably matched with the screw rod threaded sleeve to drive the distance adjusting plate and the upper magnetic yoke 8 to ascend and descend, and a locking frame 23, a U-shaped hole bracket and a locking bolt 22 are arranged between the rear end of the upper magnetic yoke 8 and a supporting frame 17 and used for guaranteeing that the upper magnetic yoke 8 is tightly attached to the connecting magnetic yoke 21 and guaranteeing stable magnetic flux conduction.
Specifically, referring to fig. 7, the working principle of the main circuit in the electric control cabinet is as follows, in the figure, the primary side of the main transformer T1 forms an alternating current voltage regulating circuit of the main circuit by a breaker QF01 and controllable silicon control switches V01 and V02, and the secondary side of the main transformer T1 forms a full-wave bridge rectifier main circuit by a bridge rectifier circuit, a shunt RS01, three sections of a load conducting coil and a freewheel tube V03.
Trigger signals of the thyristor trigger circuit are respectively generated by the AP01, a 37-wire (15 pins of the AP 01) is connected to an analog output port, and analog potential is provided by the analog output port to adjust the phase shift angle of output pulses (the higher the potential of the 15 pins is, the smaller the current is). To realize the voltage regulation of the primary side of the transformer.
In particular, the power supply of AP01 is provided by power transformer T2.
Referring to fig. 7, 8 and 9, after a preselected value is input by a touch screen, a corresponding potential is given to a 15 pin of an AP01 by a PLC channel, after a start button is pressed, a signal is extracted to a PA01 digital ammeter by a shunt (30:75 mv), a digital ammeter is provided with 0-5V analog output, current is measured by a corresponding channel of an a/D conversion module of the PLC and is sent to the touch screen for display, the measured value is compared with the preselected value, and when the displayed value is higher or lower than the preselected value, corresponding adjustment is carried out again by a PLC automatic tracking program until the two values are equal or close, so that the current value of a wire coil is stabilized.
Because the three groups of coils of the magnetic force forming device are connected in series, the magnetic field generated by the coils connected in series is influenced by the shape of the magnetic yoke, and most of the magnetic field is guided by the magnetic yoke to form a loop upwards or downwards through the opening of the C-shaped magnetic yoke. The intensity of magnetization changes with the distance of the C-shaped opening, and the larger the distance, the smaller the magnetic field under the same current parameter, and the larger the current, the larger the magnetic field under the same distance parameter. Therefore, for the present embodiment, a fitting curve based on a linear regression model of the Minitab data analysis tool is drawn by using data parameters such as multi-point sampling, current variable, distance variable, etc. (see fig. 13-15).
Because the C-shaped magnetic yoke structure adopted by the device is not integrally fixedly connected, uncertainty is unavoidably generated in the electromagnetic generation process, partial sampling is needed for distance parameters, the partial sampling comprises distance sample points of 90mm, 100mm, 110mm, 120mm, 130mm, 140mm and 150mm, under the condition that only current variables are changed, curve parameters are obtained based on a linear regression model of a Minitab data analysis tool to judge whether the relationship between magnetic force (unit: gaussian, gs) and current (unit: ampere, A) has a linear relationship, reference is made to figures 14 and 15, standard deviation analysis is carried out on sampling data based on the Minitab data analysis tool, and then the sampling data and an average value are compared and summarized to obtain a standard residual curve graph of the sampling data, whether the standard residual curve has a circulating linear relationship is obtained, then a proper polynomial model is selected for fitting the sampling data, finally, the distance parameters are unchanged, a current-magnetic force fitting curve graph obtained by changing the current variables is obtained, reference is made to figure 15, the curve error of the visible current and the magnetic force has an extremely small linear relationship completely.
It is worth mentioning that, because this magnetic force former operating mode is stable, the distance parameter that usually adopts selects 90mm, 120mm and 150mm alright satisfy the magnetization demand of the electromagnetic shield sealing strip of feeding on the conveyer belt, so this empirical formula can refine to three kinds of distance again, remains three empirical formulas of single variable (electric current I):
η(%)=0.6621+0.1118*I-0.005828*I^2+0.000103*I^3; (i)
η(%)=0.7261+0.07943*I-0.003151*I^2+0.000045*I^3; (ii)
η(%)=0.7085+0.07765*I-0.003013*I^2+0.000045*I^3; (iii)
wherein, eta (%) -the height-width ratio of the electromagnetic shielding sealing strip after magnetization molding;
I-current in ampere A;
Equation I-the aspect ratio eta (%) obtained by changing the current I parameter under the working condition that the distance between the upper magnetic yoke and the lower magnetic yoke of the magnetic force forming device is 90mm, see figure 16;
equation ii-the aspect ratio η (%) obtained by changing the current I parameter under the working condition that the distance between the upper yoke and the lower yoke of the magnetic force forming device is 120mm, see fig. 17;
Equation iii-the aspect ratio η (%) obtained by changing the current I parameter under the working condition that the distance between the upper yoke and the lower yoke of the magnetic force forming device is 150mm, see fig. 18.
As a further embodiment, based on the above data modeling analysis, we provide that the electromagnetic shield seal tape, after being magnetized by the magnetic field generated by the semi-closed yoke, has a cross section of nearly "Δ" or nearly "n", wherein the nearly "Δ" type judgment range is the magnetized electromagnetic shield seal tape having an aspect ratio η (%) of more than 1.25, and the nearly "n" type judgment range is the magnetized electromagnetic shield seal tape having an aspect ratio η (%) of 1 to 1.25.
Based on the above specification of the near delta or near n electromagnetic shielding strips, the empirical formulas i, ii and iii obtained by fitting curves are input into the PLC programming codes, and the near delta or near n electromagnetic shielding strips are independently obtained by adopting proper distances between an upper magnetic yoke and a lower magnetic yoke and current parameters according to the empirical formulas, so that the electromagnetic shielding strips are convenient to calibrate and have wide applicability.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above, and various changes, modifications, substitutions and alterations can be made therein by those having ordinary skill in the art without departing from the spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims (10)
1. A magnetic force forming device for preparing electromagnetic shielding sealing strips is characterized by comprising an electric control cabinet, a machine case, a semi-closed magnetic yoke, a conductive coil and a height adjusting component,
The electric control cabinet is internally provided with a bridge rectifier, a transformer, a touch screen, an ammeter, a silicon controlled rectifier and a PLC controller which are used for conducting direct current to the conductive coil and controlling the power supply current of the conductive coil and the fault alarm reminding,
The chassis is partly covered by a semi-closed magnetic yoke, the whole semi-closed magnetic yoke is nearly C-shaped and comprises an upper magnetic yoke, a lower magnetic yoke and a connecting magnetic yoke which is vertically arranged at the rear end, wherein the rear end of the upper magnetic yoke surrounds the upper half section of the conductive coil, the rear end of the lower magnetic yoke surrounds the lower half section of the conductive coil, the middle section of the connecting magnetic yoke surrounds the middle section of the conductive coil, so that the conductive coil after being electrified generates a magnetic field, the direction of magnetic induction is conducted to the S pole of the upper magnetic yoke by the N pole of the lower magnetic yoke in a uniform vertical direction, the electromagnetic shielding strip before solidification on a feeding conveying belt between the upper magnetic yoke and the lower magnetic yoke is magnetized, disordered ferromagnetic conductive particles in the electromagnetic shielding strip are attracted to form the N pole and the S pole, the rear end surface of the upper magnetic yoke is tightly attached to the front end surface of the connecting magnetic yoke, the lower magnetic yoke is controlled to be lifted up and down by a height adjusting assembly, the lower magnetic yoke is integrally and fixedly connected with the connecting magnetic yoke,
The height adjusting assembly is arranged above the upper magnetic yoke and comprises a locating frame, a guide rod guide sleeve assembly, a screw rod threaded sleeve assembly and a distance adjusting plate movably connected with the lower end of the screw rod.
2. The magnetic force molding equipment for preparing the electromagnetic shielding sealing strip according to claim 1, wherein the upper end and the lower end of the conductive coil are connected with an electric end in parallel with a bridge rectifier and then connected with an ammeter in series, the input end of the bridge rectifier is electrically connected with a transformer, a resistor and a capacitor are connected in series between the transformer and a main loop for filtering and straightening, and a control switch of a silicon controlled rectifier is connected in parallel outside the resistor and the capacitor.
3. The magnetic force molding device for preparing the electromagnetic shielding sealing strip according to claim 1, wherein the guide rod and guide sleeve assemblies are arranged on two sides of the positioning frame, the screw sleeve is fixed in the middle of the positioning frame, the screw rod is vertically arranged after being in threaded connection with the screw sleeve, the lower end of the screw rod is movably connected with the distance adjusting plate, and the distance adjusting plate is fixedly connected with the upper end face of the upper magnetic yoke.
4. The magnetic force molding device for preparing the electromagnetic shielding sealing strip of claim 1, wherein a locking frame, a U-shaped hole bracket and a locking bolt are arranged between the back end of the upper magnetic yoke and the supporting frame, so that the upper magnetic yoke is tightly attached to the connecting magnetic yoke.
5. The magnetic force molding device for preparing the electromagnetic shielding sealing strip of claim 1, wherein the electromagnetic shielding sealing strip is approximately delta-shaped or approximately inverted U-shaped in cross section after being magnetized by a magnetic field generated by a semi-closed magnetic yoke.
6. The magnetic force molding device for preparing the electromagnetic shielding sealing strip of claim 1, wherein a dust cover is further arranged above the positioning frame.
7. The magnetic force molding device for manufacturing the electromagnetic shielding sealing strip of claim 1, wherein the upper magnetic yoke and the lower magnetic yoke are further overlapped with each other in rear ends, and are further provided with dust-proof plates, and foot pads in lower ends.
8. The magnetic force molding device for preparing the electromagnetic shielding sealing strip of claim 1, wherein an exhaust fan is arranged at one side in the case and is used for feeding air from an air inlet at the other side of the case.
9. A magnetizing forming method of an electromagnetic shielding sealing strip, according to the magnetic forming device for preparing an electromagnetic shielding sealing strip of any one of claims 1 to 8, the electromagnetic shielding sealing strip after magnetization with the required aspect ratio η (%) is obtained by adopting a C-shaped magnetic yoke spacing of 90mm, 120mm or 150mm according to the following empirical formula:
η(%)=0.6621+0.1118*I-0.005828*I^2+0.000103*I^3; (i)
η(%)=0.7261+0.07943*I-0.003151*I^2+0.000045*I^3; (ii)
η (%) =0.7085+0.07765×i-0.003013×i 2+0.000045×i 3; (iii) wherein η (%) -the aspect ratio of the electromagnetic shielding seal strip after the magnetization molding;
I-current in ampere A;
formula I-under the working condition that the distance between the upper magnetic yoke and the lower magnetic yoke of the magnetic force forming device is 90mm, changing the height-width ratio eta (%) obtained by the current I parameter;
equation ii-under the working condition that the distance between the upper magnetic yoke and the lower magnetic yoke of the magnetic force forming device is 120mm, changing the aspect ratio eta (%) obtained by the current I parameter;
equation iii-the aspect ratio eta (%) obtained by changing the current I parameter under the working condition that the distance between the upper magnetic yoke and the lower magnetic yoke of the magnetic force forming device is 150 mm.
10. The method of magnetizing an electromagnetic shielding weather strip according to claim 9, wherein the electromagnetic shielding weather strip is magnetized by a magnetic field generated by the semi-closed yoke, and the electromagnetic shielding weather strip after magnetization having an aspect ratio η (%) of greater than 1.25 is determined to have a cross section of approximately "delta" shape, and the electromagnetic shielding weather strip after magnetization having an aspect ratio η (%) of 1 to 1.25 is determined to have a cross section of approximately "n" shape.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110338815.0A CN112885559B (en) | 2021-03-30 | 2021-03-30 | Magnetic force forming equipment for preparing electromagnetic shielding sealing strip |
| MX2023008438A MX2023008438A (en) | 2021-03-30 | 2021-12-10 | MAGNETIC SHAPING DEVICE FOR MANUFACTURING AN ELECTROMAGNETIC SHIELD SEALING STRIP. |
| PCT/CN2021/137190 WO2022206018A1 (en) | 2021-03-30 | 2021-12-10 | Magnetic forming device for preparing electromagnetic shielding sealing strip |
| DE212021000490.3U DE212021000490U1 (en) | 2021-03-30 | 2021-12-10 | Magnetic force forming device for providing electromagnetic shielding sealing strips |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110338815.0A CN112885559B (en) | 2021-03-30 | 2021-03-30 | Magnetic force forming equipment for preparing electromagnetic shielding sealing strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112885559A CN112885559A (en) | 2021-06-01 |
| CN112885559B true CN112885559B (en) | 2025-01-17 |
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| CN (1) | CN112885559B (en) |
| DE (1) | DE212021000490U1 (en) |
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| CN214279724U (en) * | 2021-03-30 | 2021-09-24 | 沃奇汽车技术(苏州)有限公司 | Magnetic forming equipment for preparing electromagnetic shielding sealing strip |
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| EP0525246A1 (en) * | 1991-08-01 | 1993-02-03 | Siemens Aktiengesellschaft | Magnet arrangement with a magnetic stray field generating yoke body |
| CN102065673A (en) * | 2005-01-10 | 2011-05-18 | 弯曲的路径Emi解决方案有限责任公司 | Three-dimensional configuration providing electromagnetic interference shielding for electronics enclosure |
| CN101358330A (en) * | 2008-05-23 | 2009-02-04 | 中国科学院金属研究所 | A compact and multifunctional magnetron ion plating arc source device |
| CN102559091B (en) * | 2011-12-29 | 2013-10-16 | 四川虹欧显示器件有限公司 | Anisotropic conductive adhesive, conductive film and preparation method thereof |
| CN202405034U (en) * | 2011-12-29 | 2012-08-29 | 深圳市欣音达科技有限公司 | Constant-current magnetizing machine |
| JP2014178546A (en) * | 2013-03-15 | 2014-09-25 | Ricoh Co Ltd | Fixing member, fixing device and image forming apparatus |
| CN203159702U (en) * | 2013-04-16 | 2013-08-28 | 温州职业技术学院 | Ion plating device compatible with multi-structure coupled magnetic field |
| CN103390482B (en) * | 2013-06-24 | 2015-11-04 | 中国科学院空间科学与应用研究中心 | A device and method for generating a uniform, adjustable, stable and alternating magnetic field with a large cross-section |
| CN203630088U (en) * | 2013-12-09 | 2014-06-04 | 眉山南车紧固件科技有限公司 | Rivet group magnetization flaw detection device |
| CN103750902A (en) * | 2014-01-17 | 2014-04-30 | 上海华源热疗技术有限公司 | Magnetic induction therapy apparatus |
| CN105281411B (en) * | 2014-07-26 | 2020-07-03 | 王东奎 | Charging device for electric vehicle |
| CN105759885A (en) * | 2016-03-03 | 2016-07-13 | 东莞市纳声电子设备科技有限公司 | An intelligent precision magnetizing machine and its magnetizing method |
| CN207233494U (en) * | 2017-08-08 | 2018-04-13 | 北京交通大学 | Electric control permanent magnet formula field generator for magnetic for magnetorheological plane polishing |
| CN107424720B (en) * | 2017-08-08 | 2023-08-22 | 江西德义半导体科技有限公司 | Electric control permanent magnet type magnetic field generating device for magnetorheological plane polishing |
| CN210378654U (en) * | 2019-09-17 | 2020-04-21 | 太原陆森矿业机械有限公司 | Integral magnetizing tool equipment for magnetic pole of rotary drum magnetic separator |
| CN112885559B (en) * | 2021-03-30 | 2025-01-17 | 沃奇新材料(上海)有限公司 | Magnetic force forming equipment for preparing electromagnetic shielding sealing strip |
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| CN214279724U (en) * | 2021-03-30 | 2021-09-24 | 沃奇汽车技术(苏州)有限公司 | Magnetic forming equipment for preparing electromagnetic shielding sealing strip |
Also Published As
| Publication number | Publication date |
|---|---|
| MX2023008438A (en) | 2023-08-03 |
| WO2022206018A1 (en) | 2022-10-06 |
| DE212021000490U1 (en) | 2023-09-04 |
| CN112885559A (en) | 2021-06-01 |
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Address after: Floor 4, Building 10, No. 58, Wenxiang East Road, Songjiang District, Shanghai, 200000 Applicant after: Woogi Polymer Materials (Shanghai) Co.,Ltd. Address before: 215300 room 3, 138 CHENFENG East Road, Kunshan hi tech Development Zone, Suzhou City, Jiangsu Province Applicant before: Woqi Automotive Technology (Suzhou) Co.,Ltd. Address after: Floor 4, Building 10, No. 58, Wenxiang East Road, Songjiang District, Shanghai, 200000 Applicant after: Woogi New Materials (Shanghai) Co.,Ltd. Address before: Floor 4, Building 10, No. 58, Wenxiang East Road, Songjiang District, Shanghai, 200000 Applicant before: Woogi Polymer Materials (Shanghai) Co.,Ltd. |
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