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
  • B05B7/1404—Arrangements for supplying particulate material
  • B05B7/1431—Arrangements for supplying particulate material comprising means for supplying an additional liquid
• • 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
  • B28B1/30—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon
  • B28B1/32—Producing shaped prefabricated articles from the material by applying the material on to a core or other moulding surface to form a layer thereon by projecting, e.g. spraying
• • 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
  • B28B19/00—Machines or methods for applying the material to surfaces to form a permanent layer thereon
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
  • E04F21/00—Implements for finishing work on buildings
  • E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
  • E04F21/06—Implements for applying plaster, insulating material, or the like
  • E04F21/08—Mechanical implements
  • E04F21/12—Mechanical implements acting by gas pressure, e.g. steam pressure

Definitions

• the invention relates to a method for applying a mortar mixture which, after being produced in a compulsory mixer, is applied via a spray nozzle to an application surface to be coated.
• the dry starting mixture is fed from the compulsory mixer via a wet spraying machine to the connected spray nozzle and sprayed onto the application area with the addition of propellant air.
• the wet mixture is transported from the wet spraying machine to the spray nozzle as a compact mortar column. This mortar column is torn in the spray nozzle by compressed air. This creates the actual spray material, which is applied to the application area with a material-dependent air pressure and a correspondingly dependent air volume.
• a disadvantage of this wet spray process is that longer spray interruptions of more than approximately 30 minutes are not possible.
• the delivery range is limited to 50 m, which results in a small operating radius, and the delivery height is limited to approx. 30 m.
• Hoses and machines must be stopped after more than approx. 30 minutes of spraying as well as after completion of the work, e.g. to be cleaned in the evening. This leads to a relatively high cleaning effort.
• mortar remaining in the hose results in a noticeable loss of material.
• the dry starting mixture is transported in an air stream through a delivery line to the spray nozzle.
• the wetting and mixing process takes place with the addition of water (thin-stream conveyance).
• Dry conveyance is easier to handle.
• the mixing process takes place in the spray nozzle.
• large delivery lengths and delivery heights between 40 to 150 m can be achieved.
• the cleaning effort is comparatively less, since only loan nozzle mixer need to be cleaned. Longer spray interruptions are also possible.
• a disadvantage of the dry spray technology is the fact that a greater rebound of 10 to 20% must be accepted due to the poorer moisture penetration. As a result, there is also a relatively high level of dust.
• the invention is based on the object of further developing the method mentioned at the outset in such a way that the advantages of the wet spraying method can be combined in a simple manner with those of the dry spraying method without having to accept the disadvantages of both methods mentioned.
• the technical solution is essentially characterized in that the dry mortar starting mixture is conveyed in a mixer arranged immediately in front of the spray nozzle, mixed in it with water, moved in a dense stream to the spray nozzle and under the pressure of compressed air introduced at it the application area is applied.
• the promotion in dense current leads to sufficient moisture penetration of the material.
• 1 denotes a silo for the starting material in the form of a dry mortar mixture, which is fed to a dry spraying machine 2 used.
• propellant air also reaches the spraying machine 2 at a pressure of 1.5 to 3 bar, from which the mortar mixture carried with the propellant air passes through a transport hose 4, which can be more than 100 meters long, to a mixer in a steady thin stream 5 is passed, which is connected upstream of a spray nozzle 6.
• the latter is in the drawing with the mixer 5 shown schematically as a unit, which in practice is about 60 to 70 cm long.
• the mortar starting mixture is mixed with water supplied via a feed line 7 and arrives in the form of a mortar column, ie in a dense stream, at the outlet of the spray nozzle 6, in the area of which the material under the The pressure of the driving air introduced into it via a feed line 8 is separated from the dense stream, divided and sprayed in particulate form onto the application surface 9 to which the nozzle 6 is directed.
• mixing and conveying elements e.g. a mixing and conveying shaft are exposed to the abrasive effect of the dry mortar that occurs over the conveying hose 4 at a speed of approx. 90 km / h.
• This effect can be largely reduced by regulating the amount of the mixture fed to the mixer 5 as a function of the amount of mortar that is miscible with water in its area and can be moved further in the dense stream, so that the inlet side of the mixer 5 becomes a few centimeters thick due to a accumulation process
• Mortar layer 10 forms in which the mixture particles supplied with the subsequent thin stream are intercepted before they reach the mixing or conveying elements of the mixer 5 and can develop their destructive effect.
• a probe 11 which measures the thickness of the respective mortar layer 10 on the input side of the mixer 5, is used to regulate the speed of the mixer 5.
• the likewise resulting air backflow is derived from the end of the transport hose and is fed to the spray nozzle 6 in a controllable manner via an air hose 8 guided parallel to the dense flow.
• Excess air is preferably discharged via a three-way valve 12 on the spray nozzle 6.
• propellant air or an electric motor is used for driving the mixing and conveying process of the mixer 5.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Ceramic Engineering (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Structural Engineering (AREA)
• Civil Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Nozzles (AREA)
• On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
• Furnace Housings, Linings, Walls, And Ceilings (AREA)
• Aftertreatments Of Artificial And Natural Stones (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=7678404

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (4)

Family Cites Families (23)

• 2001
  • 2001-03-21 DE DE10113785A patent/DE10113785C1/de not_active Expired - Fee Related
• 2002
  • 2002-03-20 EP EP02727254A patent/EP1370402B1/fr not_active Expired - Lifetime
  • 2002-03-20 DE DE50200758T patent/DE50200758D1/de not_active Expired - Lifetime
  • 2002-03-20 DK DK02727254T patent/DK1370402T3/da active
  • 2002-03-20 AT AT02727254T patent/ATE272475T1/de active
  • 2002-03-20 WO PCT/DE2002/000997 patent/WO2002076698A2/fr active Application Filing
  • 2002-03-20 US US10/471,821 patent/US20050226092A1/en not_active Abandoned

Non-Patent Citations (1)

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