US3616097A - Apparatus for the manufacture of sheets of asbestos cement or the like at a high hourly production rate - Google Patents

Apparatus for the manufacture of sheets of asbestos cement or the like at a high hourly production rate Download PDF

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Publication number
US3616097A
US3616097A US790549A US3616097DA US3616097A US 3616097 A US3616097 A US 3616097A US 790549 A US790549 A US 790549A US 3616097D A US3616097D A US 3616097DA US 3616097 A US3616097 A US 3616097A
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United States
Prior art keywords
sheets
suction
suction units
asbestos cement
guides
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Expired - Lifetime
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US790549A
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English (en)
Inventor
Dante Colliva
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Riva Calzoni SpA
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Riva Calzoni SpA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • B28B1/528—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement for producing corrugated sheets

Definitions

  • This invention relates to an apparatus for the manufacture of sheets of asbestos cement or the like at a high hourly production rate.
  • a moulding machine also has productivity limits which it is not possible to exceed and yet obtain a product which conforms with the standard and test requirements. For a given width of the asbestos cement sheet there is hence a productivity limit.
  • the main object of this invention is that of obviating the disadvantages mentioned above relative to conventional systems for the manufacture of asbestos cement sheets, by providing an apparatus for the manufacture of asbestos cement sheets and the like, either in the form of corrugated or flat sheets, which has a production capacity approximately double that of conventional apparatus, with an appreciable reduction in the installation and operation cost with respect to that obtained by simply doubling a conventional apparatus.
  • Another object of the invention is that of providing a large scale apparatus which permits an appreciable reduction of waste scrap and at the same time ensures a high quality production.
  • an apparatus for the manufacture of asbestos cement sheets which comprises a forming unit for forming sheets of asbestos cement, conveyor means arranged at the outlet of said forming unit for conveying the asbestos cement sheets produced by said forming unit, cutter means arranged adjacent said conveyor means for cutting each of said asbestos cement sheets into a plurality of subsheets, said cutter means being arranged to cut said sheets in the direction of advancement of said conveyor means, first and second trolley guide tracks arranged on one side of said conveyor means and arranged to extend parallel to the direction of advancement of said conveyor means, first trolley means displaceably mounted on said first trolley guide tracks, second trolley means displaceably mounted on said second trolley guide tracks, a fixed bridge structure arranged transversely above said conveyor means and said first and second trolley guide tracks, a truck slidably mounted on said fixed bridge structure, a plurality of suction boxes mounted on said truck, a plurality of suction units mounted on said track, said truck being cyclically arranged to slide on said fixed bridge structure between
  • FIGS. 4 and 5 show in detail, to an enllarged scale, suction mechanisms for the production of corrugated asbestos cement sheets, in an arrangement for picking up the sheets and for corrugating and depositing them respectively;
  • FIGS. 6 and 7 show, in detail, to an enlarged scale, flat sheet suction boxes, arranged for picking up and depositing flat asbestos cement sheets respectively.
  • the apparatus comprises an asbestos cement sheet forming unit it of the conventional type which has, however, a width about double that of a normal forming unit so that a sheet of normal length having a width double that of a normal sheet may be obtained.
  • a conveyor belt 2 Downstream of the forming unit 1 there is arranged a conveyor belt 2 which is followed by a lifting and cutting belt 3 defining a first station.
  • a central cutter 4 which is arranged to execute a middle cut so as to divide the moulded asbestos cement sheet into two sheets and two lateral cutters 5 which trim the two lateral edges of the formed sheet.
  • the cutters 4 and 5 operate during the transfer of the sheet from the belt 2 to the belt 3.
  • a transverse bridge structure 11 which carries a sliding truck 12.
  • Said truck 12 supports a pair of suction boxes 14 which are intended to lift and deposit the patterns, and a pair of suction units I5 which are intended to lift and deposit the asbestos cement sheets, by means of hydraulic jacks l3 and lateral guides 130.
  • said suction units 15 are provided with a device for forming the corrugations of the sheets, for example of the type described in the Italian Pat. No. 785,640 of the same applicant.
  • the truck 12 carries a cutting unit 16 which may comprise a central cutter 17 and two lateral cutters 18, or a greater number of cutters arranged as described in the Italian Pat. No. 784,764 of the same applicant.
  • the suction units 15 for lifting and depositing the corrugated type asbestos cement sheets comprise transoms 19 attached to the guides 130.
  • a number of parallel sucker element 20 are provided in each suction unit 15 and are secured to sleeves 21 which slide on horizontal guides 22 secured parallel to said transoms 19.
  • the two suction units 15 are arranged side by side on the truck 12 and comprise, at the adjacent sections, terminal sleeves 21a, which carry sucker elements 20a for the terminal portions of the asbestos cement sheets and are upwardly provided with projections 23.
  • Said projections 23 are connected to means for the displacement of the sleeves for the corrugation of the sheets. More precisely, in each suction unit 15 there is provided at least one hydraulic jack 24 whose rod is connected to said projection 23 and whose body is attached to another projection 25 fast with the support structure of the guides 22 on the side opposite to that on which the projections 23 are arranged.
  • the sleeves 21 are spaced apart (FIG. 4) so that the sucker elements 20 are in a position for lifting a sheet from the belt 3.
  • the rods of the jacks 24 are caused to retract into the respective jack cylinders (see FIG. the sucker elements 20 are close to each other so as to be able to form the corrugations of the previously lifted asbestos cement sheet.
  • the two suction units are arranged symmetrically so that as the edges of the two sheets which were in contact have only been cut, they move away from each other in the corrugation phase by a distance equal to double the difference between the width of the sheet when it is flat and the width of the sheet when it is corrugated. This is designed to ensure a distance between the axes of the sheets such as to allow said sheets to be deposited onto the trollies 7 carried on the tracks 6.
  • the outer sleeves 21b of the suction units 15 can be locked or unlocked on the guides 22, means being provided for sliding linkage 2l between the sleeves 21b and the lateral support structures of the guides 22.
  • An arrangement is thus obtained by means of which it is possible to move the asbestos cement sheets still further outwards, during the corrugation phase, by a length 26 (FIG. 4), by unlocking the sleeves 21b. (The locking means for the sleeves 21b are not shown).
  • the arrangement is designed to ensure that the center of the corrugated sheets shall be disposed along the fixed center line of the trollies 7, irrespective of the type of corrugation effected.
  • the distance 26 can hence be adjusted according to the type of corrugation.
  • suction units 15 When it is required to form and stack flat sheets, it is possible to replace the suction units 15 with other suction units 15a which comprise flat suction boxes 27 (FIGS. 6 and 7). The replacement is effected by unlocking the suction units 15 at the guides 13a and successively locking in the same place the transoms 19a of the suction units 15a. This replacement can be carried out rapidly since the fixing is effected by means of bolts or the like.
  • each suction unit 15a the relative suction box 27 is mounted so that it moves horizontally, the suction boxes 27 being supported by sleeves 28 which slide on the guides 22a fast with said transoms 19a.
  • the displacement of said suction boxes 27 is inversely proportional to the width of the flat asbestos cement sheets. Consequently a series of stroke end stops designed to limit the stroke 30, or, alternatively, other adjustment means are provided on the rods of the hydraulic jacks 29 to correspond to the series of widths on the flat sheets which it is required to form.
  • the transoms 19a and 19, respectively can move independently upwards or downwards so that the suction units 15 and 15a, respectively, can adapt themselves to the pile of the various trollies and therefore the heights of the piles may be different from one another.
  • the movement away from each other of the two sheets simultaneously produced is effected by movement of only the lower parts of the suction units, relative to the transoms Band 190.
  • the suction boxes 14 also move independently upwards and downwards in order to adapt themselves to the different heights of the piles of patterns.
  • the asbestos cement sheet produced by the forming mechanism 1 After the asbestos cement sheet produced by the forming mechanism 1 has been divided into two pieces by the action of the central cutter 4 and simultaneous finishing of the edges by means of the cutters 5, the said two pieces arrive on the belt 3 where the truck 12, which is arranged transversely of the belt 3, trims the front edges of the sheets, by means of the lateral cutters l8, and if necessary executes a middle cut by means of the cutter 17.
  • the two suction units 15 reach the end of their stroke, they descend onto the sheets in the arrangement shown in FIG. 4, where the sucker elements are spaced apart, while the suction boxes 14 descend onto the trollies of mixed packs 7 in order to deposit a pattern onto each pack.
  • suction units 15 and the suction boxes 14 are then raised while the truck 12 travels towards the left of FIG. 3, until it reaches the position shown in the same figure.
  • the corrugation of the two sheets is effected by means of bringing the sucker elements close together so as to assume the arrangement shown in FIG. 5.
  • the sheets are corrugated and consequently move away from each other to a maximum distance which also include the distance 26 (FIG. 4) due to the movement of the unlocked sleeves 21b along the guides 22.
  • a distance between the centerlines of the two sheets produced must be obtained which is equal to the distance between the centerlines of the tracks 6 (the distance between the centerlines of the boxes 14 is fixes and is equal to the distance between the centerlines of the tracks 8 and the tracks 6).
  • these distances can be made to correspond to the distance between the trollies 7 and 9 of the tracks 6 and 8, respectively, this latter distance being determined by the dimension requirements of the patterns and sheets and by the spaces necessary for lifting trollies by means of cranes or the platform cars for carrying mixed packs with their relative hooking devices.
  • the said distance between the centers can thus be fixed as required at the design stage irrespective of the type of corrugated or flat sheet because of the possibility of further movements guaranteed by the stroke length 26 for the corrugated mechanisms, and because of the possibility of sliding the suction boxes 27 for the flat sheets.
  • the central cut executed by the cutter 4 on the sheet coming from the moulding mechanism 1 takes place without the removal of any material and hence without giving rise to any central selvage strip. This allows a considerable reduction in waste.
  • the suction units 15 are replaced with the suction units 150 as previously described, after which the apparatus operates substantially as previously described.
  • the apparatus according to the invention enables the obtainment of a production double that obtainable with an apparatus of conventional type, with considerably reduced installation and operation costs.
  • the various controls can be grouped together, so reducing the number of devices necessary.
  • the apparatus can be provided for the simultaneous production of three sheets, by providing three suction units, three suction boxes, three pairs of tracks 6 and three pairs of tracks 9.
  • central suction unit would be provided at its base with corrugating means which move towards its middle line, while the other two suction units would move laterally.
  • An apparatus for the manufacture of sheets of asbestos cement which includes a first station, a conveyor means for taking up and cooperating in cutting into standard size sheets a large asbestos cement sheet coming from an asbestos cement sheet forming mechanism and reaching said first station, at least two tracks for patterns carrying trollies, at least two tracks for trollies for mixed packs of patterns and asbestos cement sheets, suction boxes for patterns, suction units for taking up in a first station and depositing in a second station said standard size sheets on said trollies for mixed packs, and a fixed bridge structure movably carrying said suction boxes for patterns and said suction units for said standard size sheets, wherein, according to the improvement, the apparatus comprises all said tracks for trollies arranged on one side of said conveyor means, said bridge structure being placed transverse above said tracks and said conveyor means, a sliding truck for carrying at least two of said suction boxes for patterns and at least two of said suction units for said standard size sheets, said sliding truck being mounted on said bridge, cutting means for producing at least one cut over the whole large sheet in its direction of advancement
  • each of said suction units comprises substantially horizontal guides, sleeves arranged to slide on said guides, a plurality of sucker elements fixed to said sleeves, control means for said sleeves to move them towards each other thereby effecting corrugation of said standard size sheets and move them apart reciprocally, said control means being arranged to move said sleeves towards one end of said guides during the corrugation of said sheets, in order to move thereby the simultaneously produced contiguous sheets away from each other.
  • suction units include substitute guides and suction boxes mounted on said substitute guides so that they move in a substantially horizontal direction for the production of flat asbestos cement sheets and hydraulic jack control means attached to said suction boxes.
  • An apparatus as claimed in claim 4 which includes stroke end stop members for varying the stroke limits of said suction boxes in relation to the width of the asbestos cement sheets produced.
  • said power means include control members controlling the movement of said suction units thereby to move in opposite directions apart from each other said suction units prior to depositing said standard size sheets on said trollies for mixed packs, and to maintain said suction units in a closeup position when said suction units reach said first station.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
US790549A 1968-01-22 1969-01-13 Apparatus for the manufacture of sheets of asbestos cement or the like at a high hourly production rate Expired - Lifetime US3616097A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1185568 1968-01-22

Publications (1)

Publication Number Publication Date
US3616097A true US3616097A (en) 1971-10-26

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US790549A Expired - Lifetime US3616097A (en) 1968-01-22 1969-01-13 Apparatus for the manufacture of sheets of asbestos cement or the like at a high hourly production rate

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Country Link
US (1) US3616097A (de)
AT (1) AT297566B (de)
BE (1) BE725702A (de)
DE (1) DE1902442A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3928105A (en) * 1973-05-04 1975-12-23 Fiberglas Canada Ltd Automated apparatus and process for making match molded covering

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3928105A (en) * 1973-05-04 1975-12-23 Fiberglas Canada Ltd Automated apparatus and process for making match molded covering

Also Published As

Publication number Publication date
BE725702A (de) 1969-05-29
AT297566B (de) 1972-03-27
DE1902442A1 (de) 1971-01-21

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