EP3300836B1 - Apparatus for spraying an abrasive mixture towards a delicate surface for removing writings, drawings or graffiti therefrom - Google Patents
Apparatus for spraying an abrasive mixture towards a delicate surface for removing writings, drawings or graffiti therefrom Download PDFInfo
- Publication number
- EP3300836B1 EP3300836B1 EP17193107.4A EP17193107A EP3300836B1 EP 3300836 B1 EP3300836 B1 EP 3300836B1 EP 17193107 A EP17193107 A EP 17193107A EP 3300836 B1 EP3300836 B1 EP 3300836B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- duct
- mixing chamber
- inlet
- air
- abrasive
- 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
- 239000000203 mixture Substances 0.000 title claims description 41
- 238000005507 spraying Methods 0.000 title claims description 19
- 239000000843 powder Substances 0.000 claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 239000007921 spray Substances 0.000 claims description 30
- 238000012856 packing Methods 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 2
- 239000004576 sand Substances 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000030279 gene silencing Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1481—Spray pistols or apparatus for discharging particulate material
- B05B7/149—Spray pistols or apparatus for discharging particulate material with separate inlets for a particulate material and a liquid to be sprayed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1404—Arrangements for supplying particulate material
- B05B7/144—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means
- B05B7/1445—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means involving vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1404—Arrangements for supplying particulate material
- B05B7/1463—Arrangements for supplying particulate material the means for supplying particulate material comprising a gas inlet for pressurising or avoiding depressurisation of a powder container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
- B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
- B24C5/04—Nozzles therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
Definitions
- the present invention is generally applicable in the field of apparatus for removing writings, drawings or graffiti from a surface and it particularly regards an apparatus for removing writings, drawings or graffiti from a delicate surface, such as for example the surface of a monument, an artwork or a historical building.
- the invention also regards a system comprising such apparatus.
- known apparatus generally comprise a tank with a mixing chamber inside which the water and sand are mixed, a compressor for pressurising the mixture, and a spray device connected to the tank operable by the user to suitably direct the outflowing jet.
- Such apparatus generally operate with high pressures and use a high grain size abrasive. Thus, the use thereof could damage the delicate surface to be cleaned, thus making the known apparatus particularly unsuitable for cleaning monuments, artworks or delicate surfaces.
- the water and sand mixture tend to deposit inside the mixing chamber and more generally along the line for supplying the water and abrasive mixture, with the risk of damaging the apparatus and/or jeopardising the efficiency thereof.
- An object of the present invention is to at least partly overcome the drawbacks illustrated above, by providing a transportable apparatus for spraying an abrasive mixture towards a delicate surface that is highly efficient and relatively inexpensive.
- Another object of the invention is to provide an apparatus transportable by an operator for spraying an abrasive mixture towards a delicate surface.
- Another object of the invention is to provide a transportable apparatus for spraying an abrasive mixture towards a delicate surface, capable of maintaining the surface in question intact.
- Another object of the invention is to provide a transportable apparatus for spraying an abrasive mixture containing an abrasive with particularly small grain size towards a delicate surface.
- Another object of the invention is to provide a transportable apparatus for spraying an abrasive mixture towards a delicate surface, that does not clog.
- Another object of the invention is to provide a transportable apparatus for spraying an abrasive mixture towards a delicate surface, having high volume capacity and small overall dimensions.
- Another object of the invention is to provide a transportable apparatus for spraying an abrasive mixture towards a delicate surface, that is particularly silent.
- a further object of the invention is to provide a system for spraying an abrasive mixture towards a delicate surface, for removing writings or graffiti therefrom.
- a system 1 for removing writings, drawings or graffiti from a delicate surface S by spraying an abrasive mixture M towards the surface S is a system 1 for removing writings, drawings or graffiti from a delicate surface S by spraying an abrasive mixture M towards the surface S .
- the latter may for example consist in a surface of a wall, a partition, a historical building, a monument, an artwork, an archaeological site or the like.
- the system 1 thus comprises at least one apparatus 10 for spraying such abrasive mixture M .
- the abrasive mixture M comprises a gas, for example air G , an abrasive powder A , for example sand, and a liquid, for example water H .
- the air G , the abrasive powder A and water H are suitably mixed to each other to form the abrasive mixture M as better explained hereinafter.
- the apparatus 10 may exploit the synergistic action of air G , abrasive powder A and water H so as to obtain a high writings removal efficiency.
- the system 1 comprises respective means 5 for supplying air G , means for supplying abrasive powder A and means 7 for supplying water H .
- the supply means 5 , 7 may comprise one or more ducts, tanks, compressors and/or pumps operatively connected to each other in a per se known manner.
- the means 7 for supplying water H may comprise a tank while the means 5 for supplying air G may comprise one or more ducts and a compressor for pressurising the air G .
- the means 7 for supplying water H may comprise one or more ducts configured to be connected to a normal water supply system.
- the apparatus 10 may be configured in a manner such that the abrasive mixture M sprayed towards the delicate surface S has low pressure, for example a pressure below 3 bars, preferably below 2.5 bars.
- this may enable maintaining the delicate surface S intact during writings, drawings or graffiti removal operations.
- the means 5 for supplying air G may be configured to provide a flow rate of about 450 l/min of air G at a pressure comprised between 3 and 8 bars, while the means 7 for supplying water H may be configured to provide a flow rate of about 5 l/hr of water H at a pressure comprised between 2 and 4 bars.
- the apparatus 10 may comprise at least one support structure 11, for example a sheet and/or tubular metal structure.
- the support structure 11 may be transportable. To this end, the latter may comprise means 12 for the transportation thereof by an operator, for example wheels and/or handles.
- the support structure 11 may suitably have small overall dimensions.
- the same could have weight and dimensions such to enable the transportation thereof.
- it may have a weight less than 25 kg, a height less than 1 m, a width less than 0.3 m and a depth less than 0.4 m.
- the apparatus 10 comprises at least one spray lance 51 for spraying the abrasive mixture M towards the surface S which may be operatively coupled with the support structure 11 .
- the spray lance 51 may be fluidically connected with one or more means for supplying the abrasive powder A , air G and water H .
- the apparatus 10 comprises an inlet port 15 fluidically connectable to the means 5 for supplying air G and may comprise a single inlet port 16 fluidically connectable to the means 7 for supplying water H .
- the spray lance 51 may have a zone 52 graspable by the user to allow the latter to operate the former, preferably with only one hand.
- Such characteristic may be particularly useful in case there arises the need to remove writings, drawings or graffiti from surfaces of environments that are narrow and/or difficult to access.
- the support structure 11 may comprise at least one tank 21 which may be of the per se known type suitable to contain such type of abrasive powder A .
- the latter may have a particularly small grain size, i.e. a grain size smaller than 1.5 mm, preferably smaller than 1 mm and even more preferably smaller than 0.5 mm.
- the tank 21 thus comprises a duct 22 for loading the abrasive powder A which may be fluidically connected with the means for supplying the same and at least one opening 23 for the exit of the abrasive powder A .
- the tank 21 may have an elongated shape, preferably substantially cylindrical, and it may have dimensions such to be arranged substantially vertically inside the support structure 11.
- the tank 21 may have an internal volume of about 10 I.
- the tank 21 may comprise a lower discharge portion 23' which includes the opening 23 and comprises an upper portion 22' which includes the duct 22 for loading the abrasive powder A.
- the duct 22 for loading the abrasive powder A may be arranged in a manner such to remain at the upper zone of the support structure 11 in a manner such to be easily accessible by the operator to load the abrasive powder A thereinto.
- the loading duct 22 comprises a closing element 29 configured to allow the loading of the abrasive powder A into the tank 21 and prevent it from exiting therefrom.
- a closing element 29 may be a trapdoor or a check valve.
- the apparatus 10 comprises a chamber 31 for mixing the air G and the abrasive powder A .
- the mixing chamber 31 comprises at least one inlet 32 for the abrasive powder A and at least one inlet 33 fluidically connected with the inlet port 15 , and an outlet 34 for the air G and abrasive powder A mixture.
- the opening 23 of the tank 21 may be fluidically connected with the inlet 32 of the mixing chamber 31 , for example by means of a duct.
- the lower discharge portion 23' of the tank 21 may be configured in a manner such to define a hopper which includes the opening 23 .
- the mixing chamber 31 may be arranged in proximity of the opening 23 .
- the mixing chamber 31 may be configured in a manner such that the opening 23 and the inlet 32 may substantially coincide.
- the flow of air G in the mixing chamber 31 may promote the suctioning of the abrasive powder A from the tank 21 inside the same.
- the mixing chamber 31 may be configured in a manner such to mix the abrasive powder A and air G by means of the known "Venturi effect".
- the tank 21 is pressurised in a manner such to facilitate the outflow of the abrasive powder A therefrom and prevent the entry of foreign material.
- the apparatus 10 comprises pneumatic means for pressurising the tank 21 which include a duct 24 for the fluidic connection of the upper portion 22' of the tank 21 and of the inlet port 15 .
- the inflowing air G feeds both the spray lance 51 and such pneumatic pressurisation means.
- the latter in particular, pneumatically forces the closing element 29 of the loading duct 22 to close so as to prevent the exit of the abrasive powder A and the entry of foreign bodies through the loading duct 22 .
- Anti-packing means are provided, i.e. means for preventing the packing of the abrasive powder A acting on the tank 21 and/or on the abrasive powder A to facilitate the outflow thereof towards the inlet 32 of the mixing chamber 31 .
- Such anti-packing means are of the pneumatic type and may comprise a duct 35 fluidically connected with the inlet port 15 which may have an outlet 36 arranged on the discharge portion 23 ' in proximity of the opening 23 .
- the inflow of air G into such discharge portion 23 ' may possibly break the packing of the abrasive powder A and avoid the clogging of the inlet 32 thus facilitating the inflow of abrasive powder A into the mixing chamber 31 .
- the apparatus 10 may further comprise valve means 37 acting on the duct 35 , to control the selective inflow of air G into the duct 35 .
- valve means 37 may be controllable by the operator.
- a lever or knob 37 ' acting on such valve means 37 that can be gripped by the operator and arranged on the upper zone of the support structure 11 so as to be easily accessible to the operator.
- valve means 37 may be configured in a manner such to allow the selective inflow of air G into the duct 35 even during the operation of the apparatus 10 .
- the pneumatic anti-packing means may further comprise vibrating means 25 acting on the tank 21 to move the latter so as to shake the abrasive powder A so as to avoid the packing thereof in the tank 21 and promote the outflow towards the opening 23 of the tank 21 .
- Such vibrating means 25 may be of the pneumatic type.
- they may comprise one or more pneumatic pistons operatively connected with the tank 21 .
- the vibrating means 25 may thus comprise a duct 26 which may be fluidically connected with the inlet port 15 in a manner such that the air G promotes the action of the latter.
- the vibrating means 25 may be arranged in proximity of the tank 21 in the support structure 11 so that the overall dimensions of the apparatus 10 are particularly small.
- a silencing element for reducing the noise of such vibrating means 25 .
- the vibrating means 25 may be particularly silent.
- the means 5 for supplying air G may thus be fluidically connected with the spray lance 51 , with the tank 21 , with the duct 35 , with the inlet 32 of the mixing chamber 31 and with the vibrating means 25.
- the air G flowing into the apparatus 10 may feed one or more of the latter.
- all the latter may be fluidically connected to the port 15 for the inflow of air G .
- the energy consumption and the overall dimensions of the apparatus 10 may be particularly small.
- ducts 38 for fluidically connecting the inlet 15 with the mixing chamber 31 , in particular with the inlet 32 of the latter.
- the spray lance 51 may be fluidically connected with the inlet 34 of the mixing chamber 31 , for example by means of a duct 34' , so as to spray an air G and abrasive powder A mixture.
- such duct 34' may be flexible, for example it may consist in one or more flexible pipes, in a manner such to facilitate the operation of transporting the spray lance 51 and/or the support structure by the operator.
- the spray lance 51 comprises at least one spray nozzle 59 and is configured to spray an abrasive mixture M formed by air G , abrasive powder A and water H , towards the surface S .
- the spray lance 51 comprises a mixing chamber 55 substantially similar to the mixing chamber 31 .
- the mixing chamber 55 has an inlet 56 fluidically connected with the outlet 34 of the mixing chamber 31 , an inlet 57 fluidically connected with the inlet port 16 and an outlet 58 for the abrasive mixture M fluidically connected with the nozzle 59 .
- the water H and the abrasive powder A may solely come into contact in the mixing chamber 55 which may exploit the known "Venturi effect" in a manner similar to the mixing chamber 31 .
- the water H with the abrasive powder A forms sludge which may then deposit in the apparatus 10 with the risk of at least partly clogging it thus preventing the proper spraying of the mixture M towards the surface S .
- the mixing chamber 55 is arranged in proximity of the nozzle 59 in a manner such that the formed abrasive mixture M passes through the spray lance 51 for a brief section.
- the inlet 57 of the mixing chamber 55 may be arranged in proximity of the outlet 58 thereof which may be proximal to the nozzle 59 .
- the abrasive mixture M may pass through only for a brief section in the spray lance 51.
- the apparatus 10 may comprise an inlet 16 for the water H connectable to the supply means 7 thereof, which may be positioned on the support structure 11 in proximity of the inlet 15 for air G .
- the apparatus 10 may be particularly compact and comfortable to use.
- a duct 42 fluidically connected with the inlet 16 and the mixing chamber 55 which may be at least partly arranged in proximity of the duct 34' so as to facilitate the transportation operations.
- the ducts 42 , 34' may be flexible pipes at least partly inserted into a protection piping 45 , flexible too.
- the duct 42 may be fluidically connected with the inlet 57 of the mixing chamber 55 .
- the apparatus 10 may suitably comprise valve means 49 acting on the duct 42 so as to allow the selective inflow of water H and valve means 48 acting on the duct 42 for the fine regulation of the inflow of water H to the mixing chamber 55 acting on such duct 42 .
- valve means 49 may be arranged upstream of the valve means 48 and both may be upstream of the inlet 57 of the mixing chamber 55 .
- the spray lance 51 may comprise knobs or levers 48' , 49' , that can be operated by the operator and which may act on the respective valve means 48 , 49 .
- valve means 39 for regulating the selective inflow of air G , the valve means which may preferably act on the duct 38 upstream of the mixing chamber 31.
- the spray lance 51 may comprise a lever 39' acting on the regulation means 39 which may be operated by the operator in use.
- the levers 39' , 49' may be positioned at the handle 52 in a manner such that the operator can selectively actuate one or both without interrupting the operation of the apparatus 10 and/or without releasing the handle 52 .
- the valve means 39 , 49 , 37 may be of the pneumatic type, for example pneumatic valves such as a slide valve, and they may be operatively connected to the supply means 5 in a per se known manner, preferably to the port 15 for the inflow of air G , so that the latter promotes the actuation of the valve means 39 , 49 , 37 .
- valve means 39 there may be provided suitable ducts passing through the protection piping 45 in a manner such to operatively connect the lever 39 ' and the regulation means 39 so that, by acting on the former, the user may promote the actuation of the latter.
- the operator may spray a mixture formed by air G and abrasive powder A , an abrasive mixture M formed by air G , abrasive powder A and water H , or just water H , for rinsing for example, towards the surface S .
- spraying the water H alone enables cleaning the mixing chamber 55 and the nozzle 59 thus preventing the abrasive powder A from depositing therein.
- the duct 42 may have one end 42 ' removably coupled with the inlet 57 of the mixing chamber 55 in a manner such that the duct 42 can be removed from the latter.
- the duct 42 may be irremovably fixed to the mixing chamber 55 .
- the spray lance 51 may comprise a support portion 53 , for example substantially tubular, to removably receive the mixing chamber 55 .
- the latter may be removably inserted into such support portion 53 to allow the operator to remove the mixing chamber 55 from the tubular portion 53 so as to facilitate maintenance and/or cleaning thereof.
- the operator may access the operating chamber 55 to inspect the latter and/or clean it from potential residual abrasive powder A in a simple or quick manner.
- most of the mixture M may consist in air G which may come from the operating environment.
- the flow rate of the water H may be particularly lower than the flow rate of the air G .
- the system 1 may comprise the tank 21 for the additive A and possibly a tank for the water H fluidically connected to the inlet port 16 .
- such tank for the water H may be small in size without jeopardising the high volume spraying capacity of the apparatus 10 .
- a trolley or a vehicle V on which the tank for the water H and the compressor for the air G can be mounted.
- the system 1 and in particular the apparatus 10 may be even easier to operate so as to allow use in particularly narrow environments such as a museum, an artwork, a historical centre or archaeological site.
- the user may operatively initially position the system 1 in proximity of the area where the surface S to be cleaned is located, subsequently move within the area with the apparatus 10 and lastly grasp the spray lance 51 to spray the abrasive mixture M towards the surface S.
Description
- The present invention is generally applicable in the field of apparatus for removing writings, drawings or graffiti from a surface and it particularly regards an apparatus for removing writings, drawings or graffiti from a delicate surface, such as for example the surface of a monument, an artwork or a historical building.
- The invention also regards a system comprising such apparatus.
- There are known apparatus for removing writings, drawings or graffiti from a delicate surface such as for example the surfaces of a historical building, an artwork, a monument or the like, the apparatus operating by spraying a liquid, generally water, and an abrasive, generally sand, towards the delicate surface.
- In particular, known apparatus generally comprise a tank with a mixing chamber inside which the water and sand are mixed, a compressor for pressurising the mixture, and a spray device connected to the tank operable by the user to suitably direct the outflowing jet.
- Such apparatus generally operate with high pressures and use a high grain size abrasive. Thus, the use thereof could damage the delicate surface to be cleaned, thus making the known apparatus particularly unsuitable for cleaning monuments, artworks or delicate surfaces.
- Furthermore, in such known apparatus, the water and sand mixture tend to deposit inside the mixing chamber and more generally along the line for supplying the water and abrasive mixture, with the risk of damaging the apparatus and/or jeopardising the efficiency thereof.
-
- An object of the present invention is to at least partly overcome the drawbacks illustrated above, by providing a transportable apparatus for spraying an abrasive mixture towards a delicate surface that is highly efficient and relatively inexpensive.
- Another object of the invention is to provide an apparatus transportable by an operator for spraying an abrasive mixture towards a delicate surface.
- Another object of the invention is to provide a transportable apparatus for spraying an abrasive mixture towards a delicate surface, capable of maintaining the surface in question intact.
- Another object of the invention is to provide a transportable apparatus for spraying an abrasive mixture containing an abrasive with particularly small grain size towards a delicate surface.
- Another object of the invention is to provide a transportable apparatus for spraying an abrasive mixture towards a delicate surface, that does not clog.
- Another object of the invention is to provide a transportable apparatus for spraying an abrasive mixture towards a delicate surface, having high volume capacity and small overall dimensions.
- Another object of the invention is to provide a transportable apparatus for spraying an abrasive mixture towards a delicate surface, that is particularly silent.
- A further object of the invention is to provide a system for spraying an abrasive mixture towards a delicate surface, for removing writings or graffiti therefrom.
- These and other objects to be further clarified hereinafter, are attained by an apparatus according to
claim 1. - The dependent claims describe advantageous embodiments of the invention.
- Further characteristics and advantages of the invention will be more apparent in light of the detailed description of a preferred but non-exclusive embodiment of the invention, illustrated by way of non-limiting example with reference to the attached drawings, wherein:
-
FIG. 1 is a schematic view of asystem 1; -
FIGS. 2 and 3 are axonometric views of anapparatus 10; -
FIGS. 4 and5 are enlarged schematic views of some details of theapparatus 10; -
FIG. 6 is an enlarged schematic view of thespray lance 51 wherein themixing chamber 55 is separated from thesupport portion 53 for cleaning and/or maintenance. - With reference to the attached drawings, herein described is a
system 1 for removing writings, drawings or graffiti from a delicate surface S by spraying an abrasive mixture M towards the surface S. The latter may for example consist in a surface of a wall, a partition, a historical building, a monument, an artwork, an archaeological site or the like. - The
system 1 thus comprises at least oneapparatus 10 for spraying such abrasive mixture M. More in particular, the abrasive mixture M comprises a gas, for example air G, an abrasive powder A, for example sand, and a liquid, for example water H. In particular, the air G, the abrasive powder A and water H are suitably mixed to each other to form the abrasive mixture M as better explained hereinafter. - Thus, the
apparatus 10 may exploit the synergistic action of air G, abrasive powder A and water H so as to obtain a high writings removal efficiency. - Suitably, the
system 1 comprises respective means 5 for supplying air G, means for supplying abrasive powder A and means 7 for supplying water H. - In particular, the supply means 5, 7 may comprise one or more ducts, tanks, compressors and/or pumps operatively connected to each other in a per se known manner.
- For example, as schematically illustrated in
fig. 1 , themeans 7 for supplying water H may comprise a tank while themeans 5 for supplying air G may comprise one or more ducts and a compressor for pressurising the air G. - Possibly, even though not shown in the attached figures, the
means 7 for supplying water H may comprise one or more ducts configured to be connected to a normal water supply system. - Thus, the
apparatus 10 may be configured in a manner such that the abrasive mixture M sprayed towards the delicate surface S has low pressure, for example a pressure below 3 bars, preferably below 2.5 bars. - Thus, this may enable maintaining the delicate surface S intact during writings, drawings or graffiti removal operations.
- The
means 5 for supplying air G may be configured to provide a flow rate of about 450 l/min of air G at a pressure comprised between 3 and 8 bars, while themeans 7 for supplying water H may be configured to provide a flow rate of about 5 l/hr of water H at a pressure comprised between 2 and 4 bars. - The
apparatus 10 may comprise at least onesupport structure 11, for example a sheet and/or tubular metal structure. - The
support structure 11 may be transportable. To this end, the latter may comprise means 12 for the transportation thereof by an operator, for example wheels and/or handles. - The
support structure 11 may suitably have small overall dimensions. In particular, the same could have weight and dimensions such to enable the transportation thereof. For example, it may have a weight less than 25 kg, a height less than 1 m, a width less than 0.3 m and a depth less than 0.4 m. - The
apparatus 10 comprises at least onespray lance 51 for spraying the abrasive mixture M towards the surface S which may be operatively coupled with thesupport structure 11. Suitably, as better explained hereafter, thespray lance 51 may be fluidically connected with one or more means for supplying the abrasive powder A, air G and water H. - According to a particular aspect of the invention, better described hereinafter, the
apparatus 10 comprises aninlet port 15 fluidically connectable to themeans 5 for supplying air G and may comprise asingle inlet port 16 fluidically connectable to themeans 7 for supplying water H. - Furthermore, for example as shown in
figures 2 and 3 , thespray lance 51 may have azone 52 graspable by the user to allow the latter to operate the former, preferably with only one hand. - Such characteristic may be particularly useful in case there arises the need to remove writings, drawings or graffiti from surfaces of environments that are narrow and/or difficult to access.
- The
support structure 11 may comprise at least onetank 21 which may be of the per se known type suitable to contain such type of abrasive powder A. - In particular, the latter may have a particularly small grain size, i.e. a grain size smaller than 1.5 mm, preferably smaller than 1 mm and even more preferably smaller than 0.5 mm.
- The
tank 21 thus comprises aduct 22 for loading the abrasive powder A which may be fluidically connected with the means for supplying the same and at least one opening 23 for the exit of the abrasive powder A. - As schematically illustrated in
fig. 4 , thetank 21 may have an elongated shape, preferably substantially cylindrical, and it may have dimensions such to be arranged substantially vertically inside thesupport structure 11. For example, thetank 21 may have an internal volume of about 10 I. - Suitably, the
tank 21 may comprise a lower discharge portion 23' which includes the opening 23 and comprises an upper portion 22' which includes theduct 22 for loading the abrasive powder A. - In particular, the
duct 22 for loading the abrasive powder A may be arranged in a manner such to remain at the upper zone of thesupport structure 11 in a manner such to be easily accessible by the operator to load the abrasive powder A thereinto. - The
loading duct 22 comprises aclosing element 29 configured to allow the loading of the abrasive powder A into thetank 21 and prevent it from exiting therefrom. For example,such closing element 29 may be a trapdoor or a check valve. - In order to form an air G and abrasive powder A mixture, the
apparatus 10 comprises achamber 31 for mixing the air G and the abrasive powder A. In particular, themixing chamber 31 comprises at least oneinlet 32 for the abrasive powder A and at least oneinlet 33 fluidically connected with theinlet port 15, and anoutlet 34 for the air G and abrasive powder A mixture. - It is thus clear that the opening 23 of the
tank 21 may be fluidically connected with theinlet 32 of themixing chamber 31, for example by means of a duct. Preferably, the lower discharge portion 23' of thetank 21 may be configured in a manner such to define a hopper which includes theopening 23. - As shown in
FIG. 4 , themixing chamber 31 may be arranged in proximity of the opening 23. Preferably, themixing chamber 31 may be configured in a manner such that the opening 23 and theinlet 32 may substantially coincide. - In particular, the flow of air G in the mixing
chamber 31 may promote the suctioning of the abrasive powder A from thetank 21 inside the same. In other words, the mixingchamber 31 may be configured in a manner such to mix the abrasive powder A and air G by means of the known "Venturi effect". - Furthermore, the
tank 21 is pressurised in a manner such to facilitate the outflow of the abrasive powder A therefrom and prevent the entry of foreign material. In particular, theapparatus 10 comprises pneumatic means for pressurising thetank 21 which include aduct 24 for the fluidic connection of the upper portion 22' of thetank 21 and of theinlet port 15. Thus, during use, the inflowing air G feeds both thespray lance 51 and such pneumatic pressurisation means. The latter, in particular, pneumatically forces the closingelement 29 of theloading duct 22 to close so as to prevent the exit of the abrasive powder A and the entry of foreign bodies through theloading duct 22. - Anti-packing means are provided, i.e. means for preventing the packing of the abrasive powder A acting on the
tank 21 and/or on the abrasive powder A to facilitate the outflow thereof towards theinlet 32 of the mixingchamber 31. - Such anti-packing means are of the pneumatic type and may comprise a
duct 35 fluidically connected with theinlet port 15 which may have anoutlet 36 arranged on the discharge portion 23' in proximity of theopening 23. - Thus, the inflow of air G into such discharge portion 23' may possibly break the packing of the abrasive powder A and avoid the clogging of the
inlet 32 thus facilitating the inflow of abrasive powder A into the mixingchamber 31. - The
apparatus 10 may further comprise valve means 37 acting on theduct 35, to control the selective inflow of air G into theduct 35. - Such valve means 37 may be controllable by the operator. For example, there may be provided for a lever or knob 37' acting on such valve means 37 that can be gripped by the operator and arranged on the upper zone of the
support structure 11 so as to be easily accessible to the operator. - Suitably, the valve means 37 may be configured in a manner such to allow the selective inflow of air G into the
duct 35 even during the operation of theapparatus 10. - The pneumatic anti-packing means may further comprise vibrating means 25 acting on the
tank 21 to move the latter so as to shake the abrasive powder A so as to avoid the packing thereof in thetank 21 and promote the outflow towards the opening 23 of thetank 21. - Such vibrating means 25 may be of the pneumatic type. For example, they may comprise one or more pneumatic pistons operatively connected with the
tank 21. Suitably, the vibrating means 25 may thus comprise aduct 26 which may be fluidically connected with theinlet port 15 in a manner such that the air G promotes the action of the latter. - Furthermore, as shown in
fig. 4 , the vibrating means 25 may be arranged in proximity of thetank 21 in thesupport structure 11 so that the overall dimensions of theapparatus 10 are particularly small. - Possibly, there may be provided a silencing element for reducing the noise of such vibrating
means 25. - Thanks to such characteristics, the vibrating means 25, and the
apparatus 10 more in general, may be particularly silent. - In light of the above, the
means 5 for supplying air G may thus be fluidically connected with thespray lance 51, with thetank 21, with theduct 35, with theinlet 32 of the mixingchamber 31 and with the vibratingmeans 25. In other words, in use, the air G flowing into theapparatus 10 may feed one or more of the latter. - Preferably, all the latter may be fluidically connected to the
port 15 for the inflow of air G. Thus, the energy consumption and the overall dimensions of theapparatus 10 may be particularly small. - In particular, there may be provided a plurality of
ducts 38 for fluidically connecting theinlet 15 with the mixingchamber 31, in particular with theinlet 32 of the latter. - The
spray lance 51 may be fluidically connected with theinlet 34 of the mixingchamber 31, for example by means of a duct 34', so as to spray an air G and abrasive powder A mixture. - Preferably, as illustrated in
figs. 2 and 3 , such duct 34' may be flexible, for example it may consist in one or more flexible pipes, in a manner such to facilitate the operation of transporting thespray lance 51 and/or the support structure by the operator. - Furthermore, the
spray lance 51 comprises at least onespray nozzle 59 and is configured to spray an abrasive mixture M formed by air G, abrasive powder A and water H, towards the surface S. - In particular, the
spray lance 51 comprises a mixingchamber 55 substantially similar to the mixingchamber 31. - As particularly illustrated in
fig. 5 , the mixingchamber 55 has aninlet 56 fluidically connected with theoutlet 34 of the mixingchamber 31, aninlet 57 fluidically connected with theinlet port 16 and anoutlet 58 for the abrasive mixture M fluidically connected with thenozzle 59. - In other words, as schematically shown in the attached figures, the water H and the abrasive powder A may solely come into contact in the mixing
chamber 55 which may exploit the known "Venturi effect" in a manner similar to the mixingchamber 31. - As known, the water H with the abrasive powder A forms sludge which may then deposit in the
apparatus 10 with the risk of at least partly clogging it thus preventing the proper spraying of the mixture M towards the surface S. - This may enable avoiding the deposit of abrasive powder A upstream of the mixing
chamber 55 . - Furthermore, the mixing
chamber 55 is arranged in proximity of thenozzle 59 in a manner such that the formed abrasive mixture M passes through thespray lance 51 for a brief section. Preferably, theinlet 57 of the mixingchamber 55 may be arranged in proximity of theoutlet 58 thereof which may be proximal to thenozzle 59. - Thus, the abrasive mixture M may pass through only for a brief section in the
spray lance 51. - Thus, the
apparatus 10 may comprise aninlet 16 for the water H connectable to the supply means 7 thereof, which may be positioned on thesupport structure 11 in proximity of theinlet 15 for air G. Thus, theapparatus 10 may be particularly compact and comfortable to use. - Possibly, there may be provided a
duct 42, fluidically connected with theinlet 16 and the mixingchamber 55 which may be at least partly arranged in proximity of the duct 34' so as to facilitate the transportation operations. For example, as shown infigs. 2 and 3 , theducts 42, 34' may be flexible pipes at least partly inserted into aprotection piping 45, flexible too. - Furthermore, as schematically illustrated in
FIGS. 5 and 6 , theduct 42 may be fluidically connected with theinlet 57 of the mixingchamber 55. Thus, theapparatus 10 may suitably comprise valve means 49 acting on theduct 42 so as to allow the selective inflow of water H and valve means 48 acting on theduct 42 for the fine regulation of the inflow of water H to the mixingchamber 55 acting onsuch duct 42. - In particular, the valve means 49 may be arranged upstream of the valve means 48 and both may be upstream of the
inlet 57 of the mixingchamber 55. - Suitably, the
spray lance 51 may comprise knobs or levers 48', 49', that can be operated by the operator and which may act on the respective valve means 48, 49. - Suitably, there may also be provided valve means 39 for regulating the selective inflow of air G, the valve means which may preferably act on the
duct 38 upstream of the mixingchamber 31. - To this end, the
spray lance 51 may comprise a lever 39' acting on the regulation means 39 which may be operated by the operator in use. - In particular, the
levers 39', 49' may be positioned at thehandle 52 in a manner such that the operator can selectively actuate one or both without interrupting the operation of theapparatus 10 and/or without releasing thehandle 52. - The valve means 39, 49, 37, may be of the pneumatic type, for example pneumatic valves such as a slide valve, and they may be operatively connected to the supply means 5 in a per se known manner, preferably to the
port 15 for the inflow of air G, so that the latter promotes the actuation of the valve means 39, 49, 37. - To control the valve means 39, there may be provided suitable ducts passing through the protection piping 45 in a manner such to operatively connect the lever 39' and the regulation means 39 so that, by acting on the former, the user may promote the actuation of the latter.
- More generally, by acting on the
levers 39', 49' the operator may spray a mixture formed by air G and abrasive powder A, an abrasive mixture M formed by air G, abrasive powder A and water H, or just water H, for rinsing for example, towards the surface S. - Furthermore, advantageously, spraying the water H alone enables cleaning the mixing
chamber 55 and thenozzle 59 thus preventing the abrasive powder A from depositing therein. - According to a further aspect of the invention, the
duct 42 may have one end 42' removably coupled with theinlet 57 of the mixingchamber 55 in a manner such that theduct 42 can be removed from the latter. - On the other side, the
duct 42 may be irremovably fixed to the mixingchamber 55. - Furthermore, the
spray lance 51 may comprise asupport portion 53, for example substantially tubular, to removably receive the mixingchamber 55. - In particular, the latter may be removably inserted into
such support portion 53 to allow the operator to remove the mixingchamber 55 from thetubular portion 53 so as to facilitate maintenance and/or cleaning thereof. - Thus, the operator may access the operating
chamber 55 to inspect the latter and/or clean it from potential residual abrasive powder A in a simple or quick manner. - It should be clear that the cleaning and/or maintenance operation may occur with the
duct 42 connected or disconnected from the mixingchamber 55, both theduct 42 and the latter being removably or irremovably fixed with the mixingchamber 55, without departing from the scope of protection of the attached claims. - According to a particular aspect of the invention, most of the mixture M may consist in air G which may come from the operating environment.
- Thus, the flow rate of the water H may be particularly lower than the flow rate of the air G. In other words, the
system 1 may comprise thetank 21 for the additive A and possibly a tank for the water H fluidically connected to theinlet port 16. - Advantageously, such tank for the water H may be small in size without jeopardising the high volume spraying capacity of the
apparatus 10. - For example, as schematically illustrated in
fig. 1 , there may be provided for a trolley or a vehicle V on which the tank for the water H and the compressor for the air G can be mounted. - Furthermore, thanks to such characteristic, the
system 1, and in particular theapparatus 10 may be even easier to operate so as to allow use in particularly narrow environments such as a museum, an artwork, a historical centre or archaeological site. - Thus, the user may operatively initially position the
system 1 in proximity of the area where the surface S to be cleaned is located, subsequently move within the area with theapparatus 10 and lastly grasp thespray lance 51 to spray the abrasive mixture M towards the surface S. - In light of the above, it is clear that the invention attains the pre-set objectives.
- The invention is susceptible to numerous modifications and variants. All details can be replaced by other technically equivalent elements, and the materials can be different depending on the technical needs, without departing from the scope of protection defined by the attached claims.
Claims (9)
- An apparatus manually transportable by an operator for spraying an abrasive mixture (M) towards a delicate surface (S) for the removal of writings, drawings or graffiti therefrom, the apparatus being usable with first means (5) for supplying air (G) at a maximum pressure of 8 bars and with second means (7) for supplying water (H) at a maximum pressure of 4 bars, the apparatus (10) comprising:- an inlet port (15) fluidically connectable with the first means (5) for supplying air;- at least one tank (21) for an abrasive powder (A);- at least one first Venturi effect mixing chamber (31) having a first inlet (33) fluidically connectable with said inlet port (15), a second inlet (32) fluidically connected with said at least one tank (21) and a first outlet (34) for a first air (G) - abrasive powder (A) mixture;- at least one spray lance (51) manually operable by the operator comprising:wherein said at least one second mixing chamber (55) is arranged in the proximity of said at least one outlet nozzle (59) so as to prevent the abrasive mixture (M) from depositing upstream of said second mixing chamber (55);- at least one second mixing chamber (55) having a third inlet (56) fluidically connected with said at least one first outlet (34) for the inflow of said first air (G) - abrasive powder (A) mixture, a fourth inlet (57) fluidically connectable with second means (7) for supplying water (H) and a second outlet (58) for the abrasive mixture (M) formed by water (H) and by the first air (G) - abrasive powder (A) mixture;- at least one outlet nozzle (59) fluidically connected with said at least one second outlet (58) of said at least one second mixing chamber (55) to spray the abrasive mixture (M) towards the delicate surface (S);
wherein said tank (21) contains a predetermined amount of said abrasive powder (A), the apparatus (10) further comprising pneumatic anti-packing means acting on said abrasive powder (A) to facilitate the outflow thereof towards said second inlet (32), said pneumatic anti- packing means being fluidically connected with said inlet port (15) so that, during use, the air (G) flowing into the apparatus feeds both said at least one spray lance (51) and said anti- packing means;
characterized in that said tank (21) includes an upper portion (22') that comprises at least one duct (22) for loading the abrasive powder (A), the latter including a closing element (29), the apparatus further comprising pneumatic means for pressurising said tank (21) that include a third duct (24) for the fluidic connection of the upper portion (22') of the tank (21) and of said inlet port (15), so that, during use, the inflowing air (G), which feeds both said at least one spray lance (51) and said anti-packing means, pneumatically forces the closure of the closing element (29) of said loading duct (22). - Apparatus according to claim 1, wherein said tank (21) comprises a discharge portion (23') which includes an opening (23) operatively connected with said second inlet (32), said pneumatic anti-packing means comprising at least one first duct (35) acting on said discharge portion (23') in the proximity of said opening (23), the apparatus (10) further comprising first valve means (37) acting on said at least one first duct (35) controllable by the operator to control the selective inflow of air (G) into the at least one first duct (35).
- Apparatus according to the claim 1 or 2, wherein said pneumatic anti-packing means further comprise vibrating means (25) acting on said tank (21) to shake said abrasive powder (A), said pneumatic anti-packing means comprising at least one second duct (26) for the fluidic connection of said vibrating means (25) and said inlet port (15).
- Apparatus according to any one of the preceding claims, wherein said at least one spray lance (51) further comprises a support portion (53), said at least one second mixing chamber (55) being at least partially mutually removably connectable with said support portion (53) to allow the operator to remove the former from the latter so as to facilitate maintenance and/or cleaning of said at least one second mixing chamber (55).
- Apparatus according to any one of the preceding claims, comprising at least one fourth duct (42) fluidically connectable with the second means (7) for supplying water (H) and with said fourth inlet (57) of said at least one second mixing chamber (55), said at least one fourth duct (42) having one end (42') removably coupled with said fourth inlet (57) of said at least one second mixing chamber (55) so that the fourth duct (42) can be removable from the latter.
- Apparatus according to the preceding claim, further comprising second valve means (49) acting on said at least one fourth duct (42) to allow the selective inflow of water (H) into said fourth inlet (57), said second valve means (49) being actuatable by the operator during use so as to allow the selective spraying of the abrasive mixture (M) formed by the first air (G) - abrasive powder (A) mixture or by water (H) and the first air (G) - abrasive powder (A) mixture, towards the delicate surface (S).
- Apparatus according to any one of preceding claims, comprising at least one fifth duct (38) fluidically connectable with said inlet port (15) and with said first inlet (33) of said at least one first mixing chamber (31), the apparatus further comprising third valve means (39) acting on said at least one fifth duct (38) to selectively regulate the inflow of air (G) into said at least one first mixing chamber (31), the apparatus comprising a first lever (39') acting on said third valve means (39), said first lever (39') being actuatable by the operator without releasing said at least one spray lance (51).
- Apparatus according to claim 7, comprising a second lever (49') acting on said second valve means (49), said at least one spray lance (51) comprising a zone (52) graspable by the operator to operate the same (51), said graspable zone (52) comprising said first lever (39'), respectively said first and second lever (39', 49'), the latter (49', 39') being selectively actuatable by the operator with the same hand that grasps said graspable zone (52) of said at least one spray lance (51).
- System for spraying an abrasive mixture (M) towards a delicate surface (S) for removing writings, drawings or graffiti therefrom, comprising:- first means (5) for supplying air (G) at low pressure;- second means (7) for supplying water (H) at low pressure;- a transportable apparatus (10) according to one or more of the preceding claims fluidically connected with said first and second supply means.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102016000097204A IT201600097204A1 (en) | 2016-09-28 | 2016-09-28 | APPARATUS FOR SPRAYING AN ABRASIVE MIX TOWARDS A DELICATE SURFACE FOR THE REMOVAL OF WRITINGS, DRAWINGS OR GRAFFITI FROM THE SAME. |
Publications (2)
Publication Number | Publication Date |
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EP3300836A1 EP3300836A1 (en) | 2018-04-04 |
EP3300836B1 true EP3300836B1 (en) | 2020-06-10 |
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EP17193107.4A Active EP3300836B1 (en) | 2016-09-28 | 2017-09-26 | Apparatus for spraying an abrasive mixture towards a delicate surface for removing writings, drawings or graffiti therefrom |
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EP (1) | EP3300836B1 (en) |
IT (1) | IT201600097204A1 (en) |
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CN112452236B (en) * | 2020-11-25 | 2023-04-07 | 德清县金秋塑粉有限公司 | Stirring device for producing powder coating |
CN112934546A (en) * | 2021-03-25 | 2021-06-11 | 广西建工集团建筑机械制造有限责任公司 | Coating production line and coating process for standard knot of construction elevator |
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DE4440146C2 (en) * | 1994-11-10 | 1999-07-22 | Kaercher Gmbh & Co Alfred | Blasting device for cleaning objects |
ITMI20040421A1 (en) * | 2004-03-04 | 2004-06-04 | Dekos S R L | PROCEDURE FOR CLEANING STONE AND SIMILAR SURFACES WITH REDUCED ENVIRONMENTAL IMPACT |
TW200728243A (en) * | 2005-12-05 | 2007-08-01 | Krosakiharima Corp | Method for spray construction of anticase-hardened fire-resistant subjects and spray material used therein |
EP2376236B1 (en) * | 2008-12-17 | 2016-04-13 | Nordson Corporation | Powder hopper with quiet zone, a combination of a powder hopper and a powder spray gun and a method of operating a powder hopper |
-
2016
- 2016-09-28 IT IT102016000097204A patent/IT201600097204A1/en unknown
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IT201600097204A1 (en) | 2018-03-28 |
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