EP2790880B1 - Equipment for removing vehicles glasses - Google Patents
Equipment for removing vehicles glasses Download PDFInfo
- Publication number
- EP2790880B1 EP2790880B1 EP12826575.8A EP12826575A EP2790880B1 EP 2790880 B1 EP2790880 B1 EP 2790880B1 EP 12826575 A EP12826575 A EP 12826575A EP 2790880 B1 EP2790880 B1 EP 2790880B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool
- equipment
- power
- load
- metal sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000011521 glass Substances 0.000 title claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 18
- 230000005291 magnetic effect Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims 4
- 230000003213 activating effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 description 47
- 239000002184 metal Substances 0.000 description 47
- 238000009826 distribution Methods 0.000 description 16
- 238000004088 simulation Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000009529 body temperature measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000005094 computer simulation Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000004807 localization Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011545 laboratory measurement Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F3/00—Severing by means other than cutting; Apparatus therefor
- B26F3/06—Severing by using heat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F3/00—Severing by means other than cutting; Apparatus therefor
- B26F3/06—Severing by using heat
- B26F3/16—Severing by using heat by radiation
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/14—Tools, e.g. nozzles, rollers, calenders
Definitions
- the present invention relates generally to an apparatus for removing the glasses of a vehicle.
- the invention relates to an improved apparatus suitable to provide an induction heating in areas of the windscreen and of other glasses of a vehicle, in order to remove said glasses during the vehicle's repair in a bodywork, (see for example DE-A-19511657 ).
- the induction heating is already used in a bodywork to remove the windscreen, the rear window and the side windows that are glued to the metal sheet of the vehicles; said known technique consists in heating, by means of an inductor (the tool), the edge of the metal sheet where the glue is located for fixing the glass.
- the adhesive material is heated by conduction until it is detached from the metal sheet, thus also removing the glass (the enclosed figures 1, 2, 3 and 4 show a typical application of said prior art method, according to which an inductor or tool 10 is used for heating the edge of the metal sheet 11 in the area of the adhesive material 12 that is able to fix the glass 13 of the vehicle 14).
- an aim of the present invention is to obviate the above technical problems and, in particular, to make an equipment for removing vehicles glasses, which allows to use the known induction technique, by performing the removal of the glass without causing damage to the painted parts of the vehicle body that are located near the glass (i.e. the roof and the side uprights of the vehicle).
- Another purpose of the invention is to provide an apparatus for removing glazing of vehicles, which, compared to the prior art, would result in reduced time and costs of execution.
- a specific "bound field” inductor for removing glasses, also by actuating a suitable control of the power that is transferred to the metal sheet of the vehicle, thanks to the use of a special generator powering the inductor.
- the operating principle is based on making an alternate magnetic field, which is concentrated by the inductor toward the metal portion to be heated; thus, “eddy” currents are generated and said currents are able to heat very quickly said metal portion.
- the inductor in fact, generates eddy currents inside non-magnetic materials, such as aluminum, copper, silver, etc. but, due to their low electrical resistivity, said materials are slightly heated.
- said inductor generates strong eddy currents in all ferromagnetic materials, such as iron, steel, cast iron, etc.; said materials, due to their high electrical resistivity, are very quickly heated.
- the flow that is generated is able to heat metals that are far no more than a few centimeters from the tool and the heating power is greater the closer distance is provided between the inductor and the metal portion.
- the tool is improved as a result of the following phases:
- the equipment according to the invention is made firstly by reconstructing a known tool or inductor through a PC ( figure 5 ); the tool or inductor has a U-shaped ferrite core 15, with the windings 16 that are wounded around each leg 17 of the core 15 and that are series-connected so that the generated magnetic flux are both concordant; the eddy heating current that are generated on the metal sheet are added together between the two windings 16.
- the enclosed figure 6 shows the results of the simulation on a flat metal sheet; the greatest power distribution is achieved at the center of the tool and the heated region 18, in which the eddy currents are added together, has a substantially square shape and symmetrical with respect to the axis of the tool.
- the enclosed figure 7 shows the results of the simulation on a metal sheet with edge and step (in order to simulate the real shape of the metal sheet on which the vehicles glasses are usually glued); as shown, the greatest power distribution is always achieved at the center of the tool, but the heated region 19 has a shape that partially affects also the step of the metal sheet and, therefore, the visible portions of the vehicle body.
- the enclosed figure 8 shows a tool prototype 20, on which measures have been carried out to verify the above mentioned results of the computer simulations, using FEM.
- figure 9 shows a temperature measurement that is made with a thermo-camera during the heating of a flat metal sheet; it is clear that said measurement confirms the heat distribution simulated with the PC (see the enclosed figure 6 ).
- figure 10 shows the temperature measurement performed with a thermo-camera during the heating of a metal sheet with edge and step; the right portion constitutes the glass, while the cusp-shaped portion 21 shows that the heat tends to affect mostly the portion opposite to the edge of the metal sheet where the exposed part of the vehicle body is placed. Furthermore, the measurement confirms the heat distribution simulated with the PC (see figure 7 ).
- the enclosed figure 11 shows a tool (inductor) 25 which is made according to the present invention; it is able to remove the vehicle's glasses and, at the same time, with respect to the known tools, it allows to screen off the painted metal sheet 11 from the magnetic field closing on it, thus protecting the metal sheet 11 from over-heating, as well as allows to produce the heat with an elongated distribution on the metal sheet 11, so as to better follow the shape of the insulating seal that has to be unglued.
- Figure 11 also shows the heat map of the metal sheet 11; in this case, it is clear that the heat distribution is asymmetrical and uniform throughout the tool (inductor) 25 and the heating zone generated on the metal sheet 11 follows the straight distribution of the insulator (glue) which is able to fix the glass.
- an inductor 25 having a structure such as that shown in detail in the enclosed figures 12 , 15 , 18 and 19 is provided; in particular, the inductor 25 essentially consists of a C-shaped ferrite core 28 and of a coil 29 that is wrapped essentially around one leg of the C.
- the coil 29 may be provided of a spool 30 and the core 28 can be constituted by a sintered magnetic core operating at frequencies ranging from 1 kHz to 1000 kHz; the shape of the core 28 can be obtained by injection molding or by combinations of one or more U, UR, I commercial cores, so as to obtain a structure similar to the structure shown in the enclosed figures 12 , 15 , 18 and 19 , in which the length L may vary from 20 mm to 300 mm and the height H may vary from 30 mm to 400 mm.
- the result is a finished structure or a containment casing, such as the structure indicated with 31 in the enclosed figures 11 , 20, 21, 22 and 23 , which contains, within the body 33, the inductor 25 (with the highlighted lateral portion 26) and which also includes a power cable 32 and a control button 34, which makes the apparatus easy to handle and practical (unlike other known apparatus comprising footswitches or similar devices).
- the enclosed figure 12 shows a PC construction of the tool (inductor) 25, with the ferrite core 28 and the coil 29; as shown, the loops of the coil 29 are provided on a single leg of the core 28, while the free leg is used to shield the magnetic fields towards the visible portions of the vehicle's bodywork.
- the distribution of the eddy currents on the metal sheet 11 is concentrated below the coil 29, due to a "mirror" effect of the currents which are able to generate a counter-flow to counteract the magnetic flux generating said currents.
- the enclosed figure 13 shows the results of a simulation provided on a flat metal sheet; the greater heat distribution (area indicated with 35) is obtained between the two legs of the core 28 and the heated zone 36, in which the eddy currents are concentrated, has a narrow and elongated shape with a well-defined geometric shape.
- the enclosed figure 14 shows the results of a simulation provided on a metal sheet with edge and step, to simulate the real shape of the metal sheet 11 where the vehicles glasses are glued; the greater distribution of heat (area indicated with 37) is very similar to the distribution which has been previously obtained ( figure 13 ) and does not affect the step of the metal sheet and therefore the visible portions of the vehicle bodywork.
- the enclosed figure 15 shows an inductor or tool prototype 25, on which measures have been carried out to verify the above PC simulation results obtained using FEM.
- the enclosed figure 16 shows the temperature measurements that have been made with a thermo-camera during the heating of a flat metal sheet; the measure fully confirms the heat distribution simulated with the PC.
- the enclosed figure 17 shows the temperature measurements that have been made with a thermo-camera during the heating of a metal sheet with edge and step; the portion 38 at the bottom constitutes the glass, while the uppermost portion 39 shows that the heat is abruptly limited in correspondence of the side opposite to the edge of the metal sheet where the visible portion of the vehicle bodywork is located. In any case, the measurement fully confirms the heat distribution simulated with the PC.
- the induction heating equipment which is used for removing the glazing of vehicles may be schematically shown as in the enclosed figure 24 and substantially comprises an AC supply 40, which is series-connected with a bridge rectifier 49, a power generator 41 and the inductor or tool 25 that is applied to a load 42.
- the basic circuit 47 of the power generator 41 which is series-connected with a HF transformer 48, is a series or parallel resonant circuit, in which the inductance of the tool 25 resonates with the capacity of the generator 41 at a given resonance frequency "f".
- the resonance current I circulating in the inductor or tool 25 is adjusted, through a microcontroller 44 and a driver 45, by varying the frequency of the inverter 43; at equal distance between the inductor 25 and the metal sheet (the load 42), the heating power increases with the increase of the current flowing in the inductor 25 and, also, at the same current circulating inside the inductor 25, the power transferred to the metal sheet (the load 42) is greater as the inductor 25 is closer to the load 42 (the metal sheet) to heat.
- the known power generators allows to set the current of the inductor 25, but, during the removal of the glass, the tool 25 may contact directly the vehicle bodywork, thus transferring in a short time a very high power to the metal sheet (the load 42) and causing damages to the bodywork paint.
- the power generator 41 of the present invention is designed so that the inductor 25 operates with a constant power (and not with a constant current); consequently, the tool 25 always transfers the same power (that is previously set), regardless of the distance between the inductor 25 and the metal sheet (the load 42).
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- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Optics & Photonics (AREA)
- Toxicology (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
- Cleaning In General (AREA)
Description
- The present invention relates generally to an apparatus for removing the glasses of a vehicle.
- More particularly, the invention relates to an improved apparatus suitable to provide an induction heating in areas of the windscreen and of other glasses of a vehicle, in order to remove said glasses during the vehicle's repair in a bodywork, (see for example
DE-A-19511657 ). - The induction heating is already used in a bodywork to remove the windscreen, the rear window and the side windows that are glued to the metal sheet of the vehicles; said known technique consists in heating, by means of an inductor (the tool), the edge of the metal sheet where the glue is located for fixing the glass.
- Therefore, the adhesive material is heated by conduction until it is detached from the metal sheet, thus also removing the glass (the enclosed
figures 1, 2, 3 and 4 show a typical application of said prior art method, according to which an inductor ortool 10 is used for heating the edge of themetal sheet 11 in the area of theadhesive material 12 that is able to fix theglass 13 of the vehicle 14). - However, as seen in the heat map of the
inductor 10 that is shown in the enclosedfigure 4 , using said known equipment causes the fact that the greater concentration of heat that is produced on themetal sheet 11 is obtained at the center of thetool 10. - It follows that the use of said equipments causes a high risk of burning the paintwork of the vehicle near the glass to remove.
- As part of the above requirements, therefore, an aim of the present invention is to obviate the above technical problems and, in particular, to make an equipment for removing vehicles glasses, which allows to use the known induction technique, by performing the removal of the glass without causing damage to the painted parts of the vehicle body that are located near the glass (i.e. the roof and the side uprights of the vehicle).
- Another purpose of the invention is to provide an apparatus for removing glazing of vehicles, which, compared to the prior art, would result in reduced time and costs of execution.
- These and other purposes are achieved providing an apparatus for removing glazing of vehicles according to the enclosed claim 1; other technical and/or construction details of the above-mentioned equipment can also be found in the further dependent claims.
- Advantageously, according to the present invention, a specific "bound field" inductor (or tool) is provided for removing glasses, also by actuating a suitable control of the power that is transferred to the metal sheet of the vehicle, thanks to the use of a special generator powering the inductor. The operating principle is based on making an alternate magnetic field, which is concentrated by the inductor toward the metal portion to be heated; thus, "eddy" currents are generated and said currents are able to heat very quickly said metal portion.
- The inductor, in fact, generates eddy currents inside non-magnetic materials, such as aluminum, copper, silver, etc. but, due to their low electrical resistivity, said materials are slightly heated.
- On the contrary, said inductor generates strong eddy currents in all ferromagnetic materials, such as iron, steel, cast iron, etc.; said materials, due to their high electrical resistivity, are very quickly heated.
- Furthermore, the flow that is generated is able to heat metals that are far no more than a few centimeters from the tool and the heating power is greater the closer distance is provided between the inductor and the metal portion.
- Moreover, according to the present invention, the tool is improved as a result of the following phases:
- estimating the distribution of the power transmitted to the plate (that is proportional to the generated heat), through a finite element method (FEM), by using a known inductor;
- checking the goodness of the results that are obtained with said computation method, by means of laboratory measurements;
- computer simulation of fictitious inductors with different geometries and construction;
- analysis of results and choice of the optimal configuration for the work;
- making a prototype tool as shown in the simulations;
- checking the obtained results, through suitable measures;
- final implementation of the tool by means of practical tests.
- The above mentioned purposes and advantages, as well as others which will be mentioned hereinafter, become more readily clear from the description which follows, relating to a preferred embodiment of the invention, and from the enclosed drawings, in which:
-
figure 1 shows a partial and schematic section view of a tool for removing the glazing of vehicles, according to the prior art; -
figure 2 shows an example of two tools used for removing the glazing of vehicles, according to the prior art; -
figure 3 shows a schematic side view of the tool for removing the glazing of vehicles, according to the prior art; -
figure 4 shows a diagram representing the localization of heat on the plate, in correspondence of the tool that is used according to the known technique, as shown in the enclosedfigures 1-3 ; -
figures 5, 6 and 7 show respective computer simulations of the tool or inductor ofFigures 1-4 , according to the prior art, and the relative power distributions on a flat metal sheet and on a metal sheet with edge and step; -
figure 8 shows a perspective view of a tool prototype (figures 1-4 ), that is made according to the prior art; -
figures 9 and 10 show two diagrams reporting measures of the temperature detected below the tool offigure 8 , according to the prior art, during the heating, respectively, of a flat metal sheet and of a metal sheet with edge and step; -
figure 11 shows a schematic and partial view of the tool or inductor used in the apparatus for removing glazing of vehicles, according to the present invention, together with a diagram showing the localization of heat on the metal sheet; -
figures 12, 13 and 14 show relative computer simulations of an improved tool or inductor that is used in the equipment for removing glazing of vehicles, according to the present invention, as well as the related power distributions on a flat metal sheet and on a metal sheet with edge and step; -
figure 15 shows a perspective view of the tool shown infigures 12, 13 and 14 , according to the present invention; -
figures 16 and 17 show diagrams relative to temperature measurements that are detected below the tool offigure 15 , according to the invention, during heating, respectively, of the flat metal sheet and of the metal sheet with edge and step; -
figures 18 and 19 show two perspective views of the inductor or tool offigure 15 , that is used in the equipment for removing glazing of vehicles, according to the present invention; -
figures 20 and 21 show two side views of the equipment for removing glazing of vehicles, according to the present invention; -
figure 22 shows a partial top plan view of the equipment for removing the glazing of vehicles, according to the present invention; -
figure 23 shows a partial perspective view of the equipment for removing the glazing of vehicles, according to the present invention; -
figure 24 shows a block diagram of the equipment for removing the glazing of vehicles, according to the present invention. - With particular reference to the above mentioned
figures 5, 6 and 7 , the equipment according to the invention is made firstly by reconstructing a known tool or inductor through a PC (figure 5 ); the tool or inductor has aU-shaped ferrite core 15, with thewindings 16 that are wounded around eachleg 17 of thecore 15 and that are series-connected so that the generated magnetic flux are both concordant; the eddy heating current that are generated on the metal sheet are added together between the twowindings 16. - The enclosed
figure 6 shows the results of the simulation on a flat metal sheet; the greatest power distribution is achieved at the center of the tool and theheated region 18, in which the eddy currents are added together, has a substantially square shape and symmetrical with respect to the axis of the tool. - The enclosed
figure 7 shows the results of the simulation on a metal sheet with edge and step (in order to simulate the real shape of the metal sheet on which the vehicles glasses are usually glued); as shown, the greatest power distribution is always achieved at the center of the tool, but theheated region 19 has a shape that partially affects also the step of the metal sheet and, therefore, the visible portions of the vehicle body. - The enclosed
figure 8 shows atool prototype 20, on which measures have been carried out to verify the above mentioned results of the computer simulations, using FEM. - In particular,
figure 9 shows a temperature measurement that is made with a thermo-camera during the heating of a flat metal sheet; it is clear that said measurement confirms the heat distribution simulated with the PC (see the enclosedfigure 6 ). - Furthermore,
figure 10 shows the temperature measurement performed with a thermo-camera during the heating of a metal sheet with edge and step; the right portion constitutes the glass, while the cusp-shaped portion 21 shows that the heat tends to affect mostly the portion opposite to the edge of the metal sheet where the exposed part of the vehicle body is placed. Furthermore, the measurement confirms the heat distribution simulated with the PC (seefigure 7 ). - The above research about a known tool (inductor) able to remove the glasses of a vehicle shows the use limitations of said tool; in fact, it is possible to damage the visible parts of the vehicle's bodywork and the PC simulations have also pointed out that said known tool would be perhaps more suitable to perform other operations on a flat metal sheet (such as, for example, removing plastics or rubbers glued to the metal sheet of the bodywork that is not in view).
- Therefore, other various geometrical structures of the tool (inductor) have been planned, in order to achieve a complete optimization of the same.
- The enclosed
figure 11 shows a tool (inductor) 25 which is made according to the present invention; it is able to remove the vehicle's glasses and, at the same time, with respect to the known tools, it allows to screen off the paintedmetal sheet 11 from the magnetic field closing on it, thus protecting themetal sheet 11 from over-heating, as well as allows to produce the heat with an elongated distribution on themetal sheet 11, so as to better follow the shape of the insulating seal that has to be unglued.Figure 11 also shows the heat map of themetal sheet 11; in this case, it is clear that the heat distribution is asymmetrical and uniform throughout the tool (inductor) 25 and the heating zone generated on themetal sheet 11 follows the straight distribution of the insulator (glue) which is able to fix the glass. - According to the invention, therefore, it is possible to identify a
lateral portion 26 of the tool 25 (where the word "GLASS" can be written, for example, so as to easily find the portion), which will be facing the center of the glass to be removed; with reference to the heat map showed in the enclosedfigure 11 , the glue will be below thezone 27 in which the maximum heat is developed, while the visible portions of the bodywork are positioned to the right of saidzone 27 and the center of the glass is placed to the left. - In order to obtain the above heat map, according to the invention, an
inductor 25 having a structure such as that shown in detail in the enclosedfigures 12 ,15 ,18 and 19 is provided; in particular, theinductor 25 essentially consists of a C-shaped ferrite core 28 and of acoil 29 that is wrapped essentially around one leg of the C. - The
coil 29 may be provided of aspool 30 and thecore 28 can be constituted by a sintered magnetic core operating at frequencies ranging from 1 kHz to 1000 kHz; the shape of thecore 28 can be obtained by injection molding or by combinations of one or more U, UR, I commercial cores, so as to obtain a structure similar to the structure shown in the enclosedfigures 12 ,15 ,18 and 19 , in which the length L may vary from 20 mm to 300 mm and the height H may vary from 30 mm to 400 mm. - The result is a finished structure or a containment casing, such as the structure indicated with 31 in the enclosed
figures 11 ,20, 21, 22 and 23 , which contains, within thebody 33, the inductor 25 (with the highlighted lateral portion 26) and which also includes apower cable 32 and acontrol button 34, which makes the apparatus easy to handle and practical (unlike other known apparatus comprising footswitches or similar devices). - The enclosed
figure 12 shows a PC construction of the tool (inductor) 25, with theferrite core 28 and thecoil 29; as shown, the loops of thecoil 29 are provided on a single leg of thecore 28, while the free leg is used to shield the magnetic fields towards the visible portions of the vehicle's bodywork. - The distribution of the eddy currents on the
metal sheet 11 is concentrated below thecoil 29, due to a "mirror" effect of the currents which are able to generate a counter-flow to counteract the magnetic flux generating said currents. - The enclosed
figure 13 shows the results of a simulation provided on a flat metal sheet; the greater heat distribution (area indicated with 35) is obtained between the two legs of thecore 28 and theheated zone 36, in which the eddy currents are concentrated, has a narrow and elongated shape with a well-defined geometric shape. - The enclosed
figure 14 shows the results of a simulation provided on a metal sheet with edge and step, to simulate the real shape of themetal sheet 11 where the vehicles glasses are glued; the greater distribution of heat (area indicated with 37) is very similar to the distribution which has been previously obtained (figure 13 ) and does not affect the step of the metal sheet and therefore the visible portions of the vehicle bodywork. The enclosedfigure 15 shows an inductor ortool prototype 25, on which measures have been carried out to verify the above PC simulation results obtained using FEM. - In particular, the enclosed
figure 16 shows the temperature measurements that have been made with a thermo-camera during the heating of a flat metal sheet; the measure fully confirms the heat distribution simulated with the PC. - Finally, the enclosed
figure 17 shows the temperature measurements that have been made with a thermo-camera during the heating of a metal sheet with edge and step; theportion 38 at the bottom constitutes the glass, while theuppermost portion 39 shows that the heat is abruptly limited in correspondence of the side opposite to the edge of the metal sheet where the visible portion of the vehicle bodywork is located. In any case, the measurement fully confirms the heat distribution simulated with the PC. - Therefore, the induction heating equipment which is used for removing the glazing of vehicles, according to the present invention, may be schematically shown as in the enclosed
figure 24 and substantially comprises anAC supply 40, which is series-connected with abridge rectifier 49, apower generator 41 and the inductor ortool 25 that is applied to aload 42. - The
basic circuit 47 of thepower generator 41, which is series-connected with aHF transformer 48, is a series or parallel resonant circuit, in which the inductance of thetool 25 resonates with the capacity of thegenerator 41 at a given resonance frequency "f". - Normally, the resonance current I circulating in the inductor or
tool 25 is adjusted, through amicrocontroller 44 and adriver 45, by varying the frequency of theinverter 43; at equal distance between theinductor 25 and the metal sheet (the load 42), the heating power increases with the increase of the current flowing in theinductor 25 and, also, at the same current circulating inside theinductor 25, the power transferred to the metal sheet (the load 42) is greater as theinductor 25 is closer to the load 42 (the metal sheet) to heat. - The known power generators allows to set the current of the
inductor 25, but, during the removal of the glass, thetool 25 may contact directly the vehicle bodywork, thus transferring in a short time a very high power to the metal sheet (the load 42) and causing damages to the bodywork paint. Thepower generator 41 of the present invention is designed so that theinductor 25 operates with a constant power (and not with a constant current); consequently, thetool 25 always transfers the same power (that is previously set), regardless of the distance between theinductor 25 and the metal sheet (the load 42). - This is obtained thanks to a feedback control, carried out by the
microcontroller 44, which reads, through theblock 46, the active power that thepower generator 41 requests to thepower supply 40; said active power is proportional to the heating power which is transferred to theload 42 and, therefore, if the value of the input power increases, then the control acts on theinverter 45 to increase the frequency and decrease the current I of theinductor 25 up to always obtain the same power. - From the above description the technical features, as well as the advantages, of the equipment for removing the vehicles glasses, which is the object of the present invention, are clear.
- It is also clear, finally, that other variations may be made to said equipment, just as it is clear that, in the practical embodiment of the invention, the materials, shapes and dimensions of the illustrated details can be any, depending on requirements, and may furthermore be replaced with others that are technically equivalent, without departing from the scope of the invention as defined by the appended claims.
Claims (8)
- Equipment for removing vehicles glasses including a power source (40), to which an electricity generator (41), which controls at least one tool (10, 25), is connected, said tool (10, 25) being able to heat by induction at least one load (42), which consists of at least one lateral portion of a plate (11) inside of which bonding material is placed in order to attach one or more glasses (13) to the vehicle body (14), wherein said tool (10, 25) is essentially made by a C-shaped ferrite core (28) and by at least one coil (29) which is wound in a leg of the C of said core (28), characterized in that said electricity generator (41) is series-connected with a HF transformer (48) and is based on a series or parallel resonant circuit (47), wherein the inductance of said tool (25) resonates with the capacitance of said electricity generator (41) to a prefixed resonance frequency, said tool (25) being crossed by a resonant current (I) which is regulated by varying the frequency of an inverter (43), so that, at equal distance between said tool (25) and the load (42), the heating power increases with the current flowing inside the tool (25) and, for the same current flowing inside the tool (25), the power transferred to said load (42) is much higher as close as said tool (25) is placed with respect to said load (42).
- Equipment as claimed in claim 1, characterized in that said coil (29) is built with or without spools (30).
- Equipment as claimed in any one of the preceding claims, characterized in that said core (28) is made by sintered magnetic cores.
- Equipment as claimed in any one of the preceding claims, characterized in that said core (28) is made by a mold or by combinations of one or more U-shaped, UR-shaped and/or I-shaped cores.
- Equipment as claimed in any one of the preceding claims, characterized in that said core (28) has a first dimension varying between 20 and 300 mm and a second dimension varying between 30 and 400 mm.
- Equipment as claimed in any one of the preceding claims, characterized in that said tool (10, 25) is enclosed within a containment structure or enclosure (31), to which a power cable (32) is connected and which has a lateral portion (26) able to be positioned at the glass (13) to remove, and at least one activating push-button (34).
- Equipment as claimed in any one of the preceding claims, characterized in that said tool (25) operates at constant power and transfers on said load (42) always the same prefixed value of power, pre-set, regardless of the distance between said tool (25) and said load (42).
- Equipment as claimed in any one of the preceding claims, characterized in that said electricity generator (41) includes a microcontroller (44), which reads, through a pre-determined block (46), the active power required by the generator (41) to said power source (40), said required active power being proportional to the heating power transferred from said tool (25) to the load (42), so that, if the value of said required active power increases, said microcontroller (44) acts on a inverter (45) to increase the frequency and decrease said current (I) flowing inside the tool (25), in order to obtain always the same value of power.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000319A ITVI20110319A1 (en) | 2011-12-14 | 2011-12-14 | EQUIPMENT FOR REMOVAL OF VEHICLE GLASSES |
PCT/IT2012/000376 WO2013088460A2 (en) | 2011-12-14 | 2012-12-11 | Equipment for removing vehicles glasses |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2790880A2 EP2790880A2 (en) | 2014-10-22 |
EP2790880B1 true EP2790880B1 (en) | 2015-09-09 |
Family
ID=45809512
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12826575.8A Active EP2790880B1 (en) | 2011-12-14 | 2012-12-11 | Equipment for removing vehicles glasses |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2790880B1 (en) |
IT (1) | ITVI20110319A1 (en) |
WO (1) | WO2013088460A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20210307125A1 (en) * | 2016-09-27 | 2021-09-30 | Dai-Ichi High Frequency Co., Ltd. | Heater for coating removal |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58173619A (en) * | 1982-04-07 | 1983-10-12 | Nissan Shatai Co Ltd | Bonding method for joining parts of vehicle |
DE4445095A1 (en) * | 1994-12-16 | 1996-06-20 | Thaelmann Schwermaschbau Veb | Method for non-destructive parting of adhesive joints |
DE19511657A1 (en) * | 1995-03-30 | 1996-10-02 | Thaelmann Schwermaschbau Veb | Induction assembly to separate parts from vehicle chassis for recycling |
JPH11219778A (en) * | 1998-01-30 | 1999-08-10 | Sumitomo Rubber Ind Ltd | Induction heating device |
-
2011
- 2011-12-14 IT IT000319A patent/ITVI20110319A1/en unknown
-
2012
- 2012-12-11 WO PCT/IT2012/000376 patent/WO2013088460A2/en active Application Filing
- 2012-12-11 EP EP12826575.8A patent/EP2790880B1/en active Active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20210307125A1 (en) * | 2016-09-27 | 2021-09-30 | Dai-Ichi High Frequency Co., Ltd. | Heater for coating removal |
US11839009B2 (en) * | 2016-09-27 | 2023-12-05 | Dai-Ichi High Frequency Co., Ltd. | Portable induction heating device for coating removal |
Also Published As
Publication number | Publication date |
---|---|
WO2013088460A2 (en) | 2013-06-20 |
WO2013088460A3 (en) | 2013-08-15 |
EP2790880A2 (en) | 2014-10-22 |
ITVI20110319A1 (en) | 2013-06-15 |
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