EP0712694A1 - Automatische Vorrichtung zur Behandlung von Produktoberflächen - Google Patents

Automatische Vorrichtung zur Behandlung von Produktoberflächen Download PDF

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Publication number
EP0712694A1
EP0712694A1 EP95115872A EP95115872A EP0712694A1 EP 0712694 A1 EP0712694 A1 EP 0712694A1 EP 95115872 A EP95115872 A EP 95115872A EP 95115872 A EP95115872 A EP 95115872A EP 0712694 A1 EP0712694 A1 EP 0712694A1
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EP
European Patent Office
Prior art keywords
products
plant according
treatment
guiding
carts
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.)
Withdrawn
Application number
EP95115872A
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English (en)
French (fr)
Inventor
Mario Damo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gmp Poliuretani Srl
Original Assignee
Gmp Poliuretani Srl
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Filing date
Publication date
Application filed by Gmp Poliuretani Srl filed Critical Gmp Poliuretani Srl
Publication of EP0712694A1 publication Critical patent/EP0712694A1/de
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
    • B24C3/04—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other stationary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/08—Abrasive blasting machines or devices; Plants essentially adapted for abrasive blasting of travelling stock or travelling workpieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/08—Abrasive blasting machines or devices; Plants essentially adapted for abrasive blasting of travelling stock or travelling workpieces
    • B24C3/083—Transfer or feeding devices; Accessories therefor

Definitions

  • the present invention refers to an automatic plant for treating the surface of products, adapted to clean and degrease the surface of such products before they are subsequently painted or similarly finished by some other surface finishing method.
  • Such a surface pre-treatment of the products is usually carried out in special degreasing plants using chemical solvents based on vapours of trichloroethane, trichloroethylene or some other aggressive compound, wherein such products are placed on conveyor belts that transport them, in succession, first through a zone in which they stay submerged in the vapours of said chemical solvents, for a length of time which is sufficient to bring about an effective surface pre-treatment and degreasing action of the above mentioned kind, and then through a so-called rinsing zone where the products are rinsed with liquids such as water for cleaning and removing residual solvents from the surfaces of the products. Finally they are carried through a drying zone, in which the products are dried up and made ready to accept the subsequent painting or similar final surface finishing treatment, which is usually carried out in special separate painting plants.
  • a first such method consisted in trying to use aqueous solutions of detergents or hydrocarbons (eg. of the Actrel or Itb type), which however failed to ensure any satisfactory result and, furthermore, would anyway have required complex and costly processing phases and plants.
  • aqueous solutions of detergents or hydrocarbons eg. of the Actrel or Itb type
  • a second such method consisted in performing some manual processing on the products, involving mainly sanding operations on the outer surfaces of the products to be painted.
  • This manual processing has unfailingly proven very time-consuming and labour-intensive, thus adding considerably to the overall manufacturing costs, without on the other hand being able to ensure in all cases satisfactory, constant and uniform polishing effects, with resulting risks of separation of the paint subsequently applied thereupon and a reduced reliablity of the painting process itself.
  • a further method has consisted in trying to use paint materials with an enhanced capacity of adherence and anchorage on the outer surfaces of pre-treated products, by mixing to such a purpose normal finishing paints with aggressive chemical compounds, such as for instance dimethylpyrolidone, to variable percentage ratios in accordance with the material of each type of product.
  • results have been quite unsatisfactory and erratic, mainly due to the widely varying materials used to manufacture the products, to the extent that they have made this technology impracticable and unreliable in connection with an efficient, cost-effective pre-treatment of the various types of materials used in product manufacturing.
  • the purpose of the present invention is therefore to provide a new type of automatic plant for treating the surfaces of products made of different materials, which is capable of eliminating all of the afore cited drawbacks and overcoming all of the afore indicated limitations, while enabling the related processes to be take place to a high degree of reliability and productivity, under elimination of the use of any chemical substance, with resulting environmental advantages in terms of absence of such noxious chemicals and elimination of all problems created by such aggressive substances in connection with their handling, disposal and emission into the environment.
  • FIG. 1 all illustrate schematically the automatic surface treatment plant according to the invention, which is particularly adapted to treat the surface of products made of plastic materials of different kind, such as for instance moulded parts of rigid polyurethane or some other plastic material of a traditional type, having most widely differing shapes and sizes and intended for the most different uses and applications, said plant being further adapted to prepare said products for the subsequent final surface finishing treatment through the application of paint or any other similar coating which may be carried out, as usual, in special painting plants of a traditional type (not shown).
  • plastic materials of different kind such as for instance moulded parts of rigid polyurethane or some other plastic material of a traditional type, having most widely differing shapes and sizes and intended for the most different uses and applications
  • said plant being further adapted to prepare said products for the subsequent final surface finishing treatment through the application of paint or any other similar coating which may be carried out, as usual, in special painting plants of a traditional type (not shown).
  • the plant according to the present invention comprises substantially conveyor means 7 for transporting the products to be submitted to surface treatment in the manner that will be described farther on, said conveyor means being of the closed-loop type comprising guiding rails 8, 9 and 10 that run parallel to each other, are equally spaced from each other and extend along a horizontal plane, so as to form two rectilinear sections 11 and 12 that run parallel to and spaced from each other, and two curved sections 13 and 14 that mutually join the corresponding ends of said rectilinear sections 11 and 12, and further comprising at least an enclosed booth 15 provided along one of said rectilinear rail sections, eg. in the center line of the rectilinear section 11 as shown in the example being considered here, for carrying out the surface treatment of the products carried therethrough by means of jets of sand or some other appropriate hard abrasive material according to the criteria and principles described below.
  • said conveyor means being of the closed-loop type comprising guiding rails 8, 9 and 10 that run parallel to each other, are equally spaced from each
  • the plant according to the present invention further comprises a plurality of carts 16 for carrying the products to be sand-blasted, which are made preferably in the form of rectangular metal frames 17, or in some other suitable form, with a flat top surface, so as to enable one or more products undergoing surface treatment to be arranged and possibly fixed thereupon, and are provided with lower swivelling wheels 18, 19 and 20 that are fixed thereto along at least two horizontally extending rectilinear axes 21, 22 that are similar to each other, in correspondence of the respective guiding rails 8, 9 and 10, on which said wheels are therefore respectively capable of sliding, said axes being hinged with their lower portion in the corresponding frame 17 so that the latter is capable of rotating limitedly about its respective axis, along the whole extension of the rails of the plant, thereby enabling each frame to correctly keep aligned with the rails along its whole travel path on the same rails.
  • carts 16 for carrying the products to be sand-blasted, which are made preferably in the form of rectangular metal frames 17, or
  • the forward motion of the transport carts 16 along the rails is brought about by means of at least a driving chain (generally referred to as 23 in Figure 2), which is provided along the whole closed-loop extension of the middle rail 9 and interconnects all axes 21 and 22 of the carts, and therefore also all carts, which are preferably kepts at equally spaced positions, said driving chain being driven by at least an electric motor 24 in a single direction of movement A at a given rate, so that all carts 16 will be capable of being moved forward or brought to a standstill simultaneously, depending on said motor being switched in or off, respectively.
  • the forward movement of the carts can be carried out also by means of other driving mechanisms of some traditional type, which are different from the one being described here by mere way of example, without departing from the scope of the present invention.
  • the plant according to the present invention further comprises a control board 25, through which the operator can from time to time pre-set and adjust the performance of the various operational phases of the same plant, as well as an oleodynamic control unit 26 governing the treatment booth 15, one or more containers 27 provided to hold the sand or such other abrasive material as possibly used instead of the sand, said container or containers having anyway a capacity which is adequate to hold the necessary amount of sand or other abrasive material, and at least a vertically extending cyclone means which is interconnected with the booth 15 and the container 27 in the manner and to the purposes as explained hereinafter.
  • a control board 25 through which the operator can from time to time pre-set and adjust the performance of the various operational phases of the same plant, as well as an oleodynamic control unit 26 governing the treatment booth 15, one or more containers 27 provided to hold the sand or such other abrasive material as possibly used instead of the sand, said container or containers having anyway a capacity which is adequate to hold the
  • said treatment booth 15 is illustrated schematically, it can be noticed that such a booth is substantially formed by pairs of respectively lateral and longitudinal peripheral walls 29 and 30 of a box-like shape delimiting an outwardly enclosed inner treatment chamber 31, in which the products carried by the carts 16 rolling along the rails 8, 9 and 10 running at a vertical distance fron the bottom wall 32 of said chamber are submitted to pressurized jets of sand, or other hard abrasive material, in view of achieving the desired surface treatment effect, said lateral walls 30 being provided with at least a respective central through-aperture 33 and 34 which is adequately sized to enable the carts and the products arranged thereupon to move therethrough and is associated with at least a respective sliding door 35 and 36 adapted to be actuatable from an opening position to a closing position of the respective aperture, eg. from a vertically lifted position to a vertically lowered position, respectively, as considered in the particular example being described here, thereby enabling the carts with the products thereupon to move through
  • the bottom wall 32 is shaped in the form of half-walls that are sloping in opposite directions and converging so as to meet with each other at the longitudinal median zone 37 of the same wall, thereby defining a recessed zone adapted to collect the sand or the other hard abrasive material as possibly used during the phases of treatment of each single product carried by the cart 16 and introduced in the inner chamber 31 of the booth 15 through appropriate conduits (not to be seen in Figures 2 and 5) connected with the container 27 and communicating with appropriate supplies of compressed air.
  • the sand or the other possibly used abrasive material collected onto the bottom of the inner chamber 31 is extracted by suction and caused to flow through conduits (not shown) that are connected with the upper portion of the cyclone 28, where such sand, or other abrasive material, is appropriately separated in a per sè known manner from both the residual dust from the previous surface treatment of the products and any other possible foreign matter contained therein. From this cyclone, said sand, or other abrasive material, is delivered again into the container 27 through other conduits communicating with these component parts.
  • the abrasive material used for blasting is in this manner therefore fully and continuously recovered and recycled, so that it can be used in an almost unlimited manner for the herein described purposes, without any need practically arising for continuously replacing the abrasive material in each process phase or cycle.
  • the sand, or the other hard abrasive material possibly used are materials that are readily available on the market and do not involve any presence of aggressive or noxious chemical agents or compounds in them, as it was previously the case, so that they do not require the provision of any particular system for filtering them and retaining them before exhausting the air outside the plant.
  • the treatment booth 15 is further provided with at least two side rectilinear guiding rails 38 and 39 applied internally against the corresponding longitudinal peripheral walls 29 of the same booth, in a position which is adequately spaced above the rails 8, 9 and 10 on which the carts 16 are rolling, said guiding rails being formed by elongated profile sections with a quadrangular cross-section shape that are attached to the respective walls in such a manner that one of their corners is arranged in a raised position with respect to the other edges of the profile sections, thereby forming the resting and rolling plane of corresponding wheels 40 and 41 that are fixed laterally to a structure 42 supporting the spraying tool 43 for blasting the sand or other abrasive material against the outer surfaces of the products carried by the carts 16.
  • Such a support structure 42 is formed in an advantageous manner by two profiled bars 44 and 45 which are similar to each other and are parallelly spaced from each other transversally with respect to the booth 15, said bars being likewise shaped lengthwise with a quadrangular cross-section (see also Figures 3 and 6) and one of their corners arranged in a raised position with respect to the other edges so as to enable corresponding wheels 46 and 47, which are fixed laterally to a moving parallelepiped-shaped cart 48 carrying the spraying tool 43, to rest and roll on them along the entire longitudinal extension of said bars.
  • said spraying tool 43 is capable of moving on two displacement planes which are in an orthogonal configuration with respect to each product to be treated placed on a cart 16 (that is kept at a standstill in the central position of the booth 15 during all treatment phases), ie. on a first plane extending longitudinally with respect to the booth, in either one of the two mutually opposite moving directions B and C, through the displacement of the support structure 42, and therefore of the moving cart 48 that carries said tool, on the guiding rails 38 and 39, and on a second plane extending transversally with respect to the booth, in either one of the two mutually opposite directions D and E, through the displacement of the moving cart 48 and said tool along the profiled bars 44 and 45.
  • the support structure 42 is equipped with an oleodynamic driving motor 49 adapted to invert its direction of rotation and supported by said structure in proximity to one of its slide rails, eg. the rail 38 as this is shown to be the case in the example described here, said motor being coupled by means of proper gears with a driving gearwheel 50 which in turn engages a rectilinear, elongated rack 51 coupled to a U-shaped profile section 52 attached laterally in a corresponding position against an edge of the rail 38 along the entire extension thereof.
  • a driving gearwheel 50 which in turn engages a rectilinear, elongated rack 51 coupled to a U-shaped profile section 52 attached laterally in a corresponding position against an edge of the rail 38 along the entire extension thereof.
  • the support structure 42 is further provided with a further gearwheel 53 which is fixed idling laterally to the bar 45 and is engaging the rack 51 as well.
  • the transmission of the displacement motion from the motor 49 to the support structure 42 can of course take place also by some other type of basically per sè known driving means, without departing from the scope of the present invention.
  • the adjustment of the amplitude of the displacement of the support structure 42 with respect to the products arranged on the cart 16 is performed through a volumetric adjustment oleodynamic system, not shown in the Figures, comprising substantially at least an oil circulating pump incorporated in the control unit 26, communicating with an oil flow-rate regulator and an idler circulation pump which is in turn communicating through selective-control adjustment elements, such as electromagnetic valves and the like, with the oleodynamic motor 49 and with similar associated driving motors, as it will be better explained farther on, of the moving cart 48 and the remaining mechanisms provided to transmit the necessary motions to the spraying tool 43.
  • a volumetric adjustment oleodynamic system not shown in the Figures, comprising substantially at least an oil circulating pump incorporated in the control unit 26, communicating with an oil flow-rate regulator and an idler circulation pump which is in turn communicating through
  • Such an idler circulation pump is used to distribute toward each driving mechanism, through each electromagnetic valve being from time to time controlled to open, a certain volume of the oil pumped by the oil circulating pump, said volume being from time to time adjusted through an electromechanical transducer of a per sè known type which is associated with said idler pump and is controlled electrically by or from the control board 25 of the plant in accordance with the amplitude of the excursions that the spraying tool 43 is required to make and the position of the same tool with respect to the products to be treated.
  • said transducer is from time to time supplied by or from the control board with coded information concerning the amplitudes of the various excursions of the spraying tool and, through the idler pump, determines in response corresponding variations of the oil volume pumped in a respective oleodynamic motor, which therefore causes the driving motor associated therewith to be displaced accordingly.
  • the flow-rate regulator is in turn adjusted so as to regulate the flow rate of the oil according to two different values, respectively a first value in the initial phase of each movement of the respective driving mechanisms, with a resulting high-speed rotation of the corresponding oleodynamic motor, and therefore a rapid movement of the mechanism itself, and a second value, lower than the first one, in the terminal phase of such a movement, with a resulting slower rotation of said oleodynamic motor and slower and "damped" movement of said driving mechanism, such a circumstance generating the advantage of a considerable reduction in the time requirements of the spraying tool for its displacement and, therefore, also in the duration of the overall process, while on the other hand preventing said mechanisms and said tool from possibly suffering mechanical damages at the end of each travel or displacement of the tool.
  • the moving cart 48 is equipped with an oleodynamic motor 54 adapted to invert its direction of rotation and supported by the same cart in proximity to one of its displacement bars, eg. the bar 44 as this is shown to be the case in the example described here, said motor being coupled by means of proper gears with a driving gearwheel 55 which in turn engages a rectilinear, elongated rack 56 coupled to a U-shaped profile section 57 attached in a corresponding position against the lower portion of the edge of the bar 44 which is opposite to the one on which the wheel 46 is resting, along the entire extension of the same bar.
  • the displacement of the moving cart 48 transversally through the booth 15, in either direction D or E is determined by letting said motor 54 operate in the corresponding direction of rotation, thanks to the mutual engagement of the gearwheel 55 and the rack 56.
  • the moving cart 48 is provided in its central zone with at least a through-opening 58 which penetrates through it orthogonally in the vertical direction, said opening being shaped with a quadrangular cross-section and communicating with a further orthogonal through-hole 59, which is provided laterally and parallelly with respect thereto, has similarly a quadrangular cross-section shape, but has smaller dimensions than said first through-opening, so as to thereby enable a profiled bar 60 and a rack 61, both rectilinear and coupled with each other, to be respectively accomodated there in a slidable manner, said bar and said rack having both the same extension in the vertical direction, as well as similar cross-sections, and being further sized to slightly smaller dimensions than the corresponding through-openings 58 and 59.
  • the purpose of the profiled bar 60 is to support, at its lower end, the afore cited spraying tool 43 and, at its upper end, a driving mechanism 62 adapted to determine the rotary movement of said spraying tool 43 according to the criteria and principles as described below.
  • Said moving cart 48 furthermore, supports an oleodynamic motor 63 adapted to invert its direction of rotation, fixed to the same cart and coupled by means of proper gears with a driving gearwheel 64 which in turn engages the rack 61.
  • the profiled bar 60 is enabled to slidably move vertically in the through-hole 58 of the moving cart 48, along with the spraying tool 43, in the respective raising or lowering directions F or G, by letting said oleodynamic motor 63 rotate in the corresponding direction, thanks to the mutual engagement of the gearwheel 64 and the rack 61, which is coupled with the same bar, while the sildable movement of said bar in said through-hole 58 is further facilitated by the presence of a set of guiding wheels 65, 66 and 67 supported by the moving cart 48 along the travel path of said bar and acting against corresponding edges thereof.
  • the profiled bar 60 is entirely hollow along its whole length and that, along the whole length of said resulting inner cavity, there is accomodated an elongated conduit 68 having smaller dimensions than the ones of said barin order to be able to properly fit in the same bar, said conduit being hollow internally along its whole length and having a circular or other appropriate shape, so as to enable the sand or the other possibly used abrasive material to flow therethrough, from the upper portion toward the lower portion of the same conduit, in view of supplying with these materials the spraying tool 43 arranged thereunder during the surface treatment phases of the products.
  • the upper portion of the elongated conduit 68 can be noticed to be attached to its terminal end with a flat circular disk 69, which is joined through a box-like structure 70 with a similar flat circular disk 71 arranged under said first disk and appropriately spaced therefrom, thereby defining an inner chamber 72 which houses a gearwheel 73 that is coaxial with the conduit 68 and both disks 69 and 71 and is properly spaced from said disks, all these component parts, in connection with those which will be described below, forming the afore mentioned driving mechanism 62.
  • Said gearwheel 73 which has a smaller diameter than the one of said inner chamber 72 so as to be able to freely rotate therewithin, engages the driving gearwheel 74 of a further oleodynamic motor 75 adapted to invert its direction of rotation and provided with cogged gears, said motor being supported by said box-like structure 70.
  • the gearwheel 73 is fixed externally to a cylindrical bush 76 extending axially and coaxially with respect to the conduit 68 for a certain length thereof, said cylindrical bush being sized so as to be capable of being inserted and fitted on the conduit 68, with a slight clearance so as to be able to freely rotate on it, and being further housed with its upper end within a corresponding through-opening 77 of a support sleeve 78, which is coaxial to and integral with both the bush and the gearwheel 73, against which it is applied for being centered into position.
  • the lower end of the cylindrical bush 76 can be noticed to be fitted by force into the corresponding upper end of a further elongated conduit 79, which is in turn inserted and fitted coaxially around the previously described conduit 68 with a slight clearance so as to be able to freely rotate about it, and which extends along the whole free length thereof so as to slightly protrude beyond the same and to show a radiused, inclined terminal portion 80 tapering toward its outlet zone so as to thereby form a spray nozzle 81 for the passage of the sand, or any possible other abrasive material, which is directed and sprayed against the outer surfaces of the products to be treated.
  • an inclined terminal portion 80 of the conduit 79 is in an advantageous manner enclosed by a protective structure 82 which, in the case of accidental contacts thereof against possible obstacles, causes the spraying tools 43 to stop its movements, and therefore the sand-blasting operation to be arrested, in the manner described hereinafter, said protective structure comprising a box with an open bottom, formed by a flat circular wall 83 joining to a circular peripheral vertical wall 84 so sized as to be able to accomodate said inclined terminal portion 80 and to enable it to freely rotate therewithin.
  • said cylindrical bush 76 is arranged so as to be inserted axially through at least a ball or roller bearing 85 or the like, which is installed in the fixed box-like structure 70 to thereby enable the same bush to rotate, together with said further elongated conduit 79, within said box-like structure and about the fixed elongated conduit 68, thanks to the rotary motion transmitted to it by the oleodynamic motor 75 through the gearwheels 73 and 74.
  • the so arranged conduit 79 of the spraying tool 43 is capable of being adequately rotated with respect to the products arranged on the cart 16, in either one of the mutually opposite directions H and I, whereas the amplitude of such a rotation can also in this case be adjusted in the manner and with the functions and advantages as described previously, with the possibility of using also driving or motion-transmission elements that may be of any different type to ensure the transmission of the rotary motion from the oleodynamic motor 75 to the cylindrical bush 76 and the rotary conduit 79.
  • said box-like protective structure 82 is provided with one or more shortly protruding limit switches 86 of the electric type, which are operationally linked with the electric circuitry of the plant and are fixed in corresponding through-openings in the flat circular wall 83 of said protective structure and are arranged so as to face the opposite lower wall 87 of the moving cart 48, said protective structure being fixed at its lower end to the profiled bar 60, so that it is raised or lowered at the same time as said bar during the vertical displacement of the latter, under resulting adjustment of the position of such a protective structure with respect to the position of the products arranged on the carts 16, said limit switches performing the function of protecting the spray nozzle 81 from possible collisions or impacts against foreign bodies, as well as from possible erroneous commands in programming the processing phases, by acting so as to cause the spraying tool 43 to immediately stop all of its movements.
  • box-like protective structure 82 is shown to be resting on a corresponding flat circular disk 88 fixed around the rotary conduit 79 in correspondence of the terminal rectilinear zone thereof to the purpose of being capable of displacing elastically and axially on it in case of accidental impacts against foreign bodies.
  • the upper free end of the latter is connected with the container 27 of the sand, or any other possible abrasive material used, via a flexible conduit (not shown) of an adequate length, the free connection end thereof is supported by a corresponding clamp or other suitable supporting and retaining means 90 attached to the upper surface of the flat circular disk 69, and is furthermore communicating with a source of compressed air (not shown) to production the suction effect required to extract the sand, or any other type of abrasive material used instead, from the container 27, let such sand or abrasive material flow through said conduit 68, and direct such sand or abrasive material in the form of a pressurized jet against the outer surfaces of the products to be treated.
  • the operation of the surface treatment plant according to the present invention calls for one or more products to be submitted to surface treatment in the booth 15 to be arranged on each cart 16, which is interconnected with the other carts and is adapted to be operated at the same time as the other carts. Said loading of the products to be treated is carried out in the so-called loading station referred to here by the letters CA, in the condition in which the electric drive motor 24 controlling the movement of all of said carts is switched off and the same carts are therefore brought to a standstill.
  • the plant operator starts the so loaded cart into motion, by correspondingly acting on the control board 25 through a remote control, up to the position at which, while said cart is moving along the displacement direction A toward said treatment booth 15, an immediately subsequent empty cart arrives at the loading station CA, where its presence is detected by appropriate electric or electronic sensors (not shown in the Figure), which are connected with the general electric circuitry of the plant together with the motor 24, and, as a response to that detection by said sensors, they cause both said immediately subsequent cart and all other remaining carts in the plant to stop for the time needed to complete its loading with the respective products to be treated.
  • the sensors governing the actuation of the doors 35 and 36 detect such a condition and cause the same doors to be lowered back into their closed position.
  • said cart will have entered the monitoring field of further electric or electronic sensors provided there (not shown), and functionally connected with the general electric circuitry of the plant, so that these sensors detect the presence of said cart and, as a response to such a detection, cause the plant drive motor 24 to stop, so that both the considered cart arrived at such a position, where the products carried by it are intended to undergo surface treatment, and the remaining carts of the plant come to a standstill.
  • control of the automatic movements of the cited component parts, and therefore of the displacements of the spraying tool 43 occurs by preliminarily adjusting the amplitude and the position of such displacements on the control board 25 of the plant, which is to this purpose provided with per sè known data-processing devices and systems, so as to from time to time adapt such process parameters to the actual size and position of the products to be treated that will be arranged on the respective transport carts 16, in view of most accurately adjusting the motion parameters of the same component parts of the plant for decisively boosting the reliability and flexibility thereof.
  • this plant can also be provided with different structural configurations, such as for instance by using an open-type conveyor system 7, instead than a closed-loop one as afore described, and varying the number and the arrangement of the loading and unloading stations and/or the carts, or even the treatment booth 15, provided that the products are in any case treated on their surfaces, before being painted or finished similarly, with the treatment materials and process operations specified in connection with the present invention, without departing from the scope of the present invention.
  • the presence of the sand, or such other hard, environmentally sustainable abrasive material as may possibly be used, does not only mean practical advantages owing to the readily availability and the low cost of such materials, but eliminates practically any risk of environmental pollution since the treatment booth of the plant can be adequately enclosed by protective walls and possibly associated with filtering systems of any common type, ie. much simpler than the ones that are currently used in state-of-art pre-treatment plants, to separate and retain the dust produced by the materials during the treatment phases, so as to prevent it from undesirably escape into the atmosphere.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Spray Control Apparatus (AREA)
EP95115872A 1994-10-11 1995-10-09 Automatische Vorrichtung zur Behandlung von Produktoberflächen Withdrawn EP0712694A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN940062 1994-10-11
IT94PN000062A IT1268402B1 (it) 1994-10-11 1994-10-11 Impianto automatico di trattamento superficiale di prodotti

Publications (1)

Publication Number Publication Date
EP0712694A1 true EP0712694A1 (de) 1996-05-22

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EP95115872A Withdrawn EP0712694A1 (de) 1994-10-11 1995-10-09 Automatische Vorrichtung zur Behandlung von Produktoberflächen

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1015092C2 (nl) * 2000-05-02 2001-11-05 Constructiewerkplaats G C Gr N Samenstel en werkwijze voor het stralen van een metaalproduct.
EP1724063A1 (de) * 2005-05-21 2006-11-22 Friedrich Goldmann GmbH & Co Sandstrahlvorrichtung
CN103072087A (zh) * 2012-11-05 2013-05-01 贵州西南工具(集团)有限公司 片状零件表面精整处理的方法及装置
CN105773436A (zh) * 2016-05-09 2016-07-20 西安合力汽车配件有限公司 一种生产线回砂系统
ES2727675A1 (es) * 2018-04-16 2019-10-17 Eseki S A L Sistema automatico para granallado de piezas
EP3632617A4 (de) * 2017-05-26 2021-01-20 MSE Co., Ltd. Mobile sandstrahlvorrichtung
CN117415734A (zh) * 2023-12-06 2024-01-19 佛山市桥鑫重型钢构安装工程有限公司 一种辊道式抛丸机

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CN105773436A (zh) * 2016-05-09 2016-07-20 西安合力汽车配件有限公司 一种生产线回砂系统
CN105773436B (zh) * 2016-05-09 2018-06-29 西安合力汽车配件有限公司 一种生产线回砂系统
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ES2727675A1 (es) * 2018-04-16 2019-10-17 Eseki S A L Sistema automatico para granallado de piezas
WO2019202192A1 (es) * 2018-04-16 2019-10-24 Eseki, S.A.L. Sistema automático para granallado de piezas
CN117415734A (zh) * 2023-12-06 2024-01-19 佛山市桥鑫重型钢构安装工程有限公司 一种辊道式抛丸机
CN117415734B (zh) * 2023-12-06 2024-04-12 佛山市桥鑫重型钢构安装工程有限公司 一种辊道式抛丸机

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