WO2007085436A1 - Dispositif de melange ou de transport d'une pate abrasive - Google Patents

Dispositif de melange ou de transport d'une pate abrasive Download PDF

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Publication number
WO2007085436A1
WO2007085436A1 PCT/EP2007/000601 EP2007000601W WO2007085436A1 WO 2007085436 A1 WO2007085436 A1 WO 2007085436A1 EP 2007000601 W EP2007000601 W EP 2007000601W WO 2007085436 A1 WO2007085436 A1 WO 2007085436A1
Authority
WO
WIPO (PCT)
Prior art keywords
helical segments
segments
helix
lap joint
mixing
Prior art date
Application number
PCT/EP2007/000601
Other languages
German (de)
English (en)
Inventor
Reinold Erner
Original Assignee
Schwing Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schwing Gmbh filed Critical Schwing Gmbh
Publication of WO2007085436A1 publication Critical patent/WO2007085436A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
    • B28C5/4203—Details; Accessories
    • B28C5/4268—Drums, e.g. provided with non-rotary mixing blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/40—Parts or components, e.g. receptacles, feeding or discharging means
    • B01F29/403—Disposition of the rotor axis
    • B01F29/4033—Disposition of the rotor axis inclined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F29/00—Mixers with rotating receptacles
    • B01F29/60—Mixers with rotating receptacles rotating about a horizontal or inclined axis, e.g. drum mixers
    • B01F29/63—Mixers with rotating receptacles rotating about a horizontal or inclined axis, e.g. drum mixers with fixed bars, i.e. stationary, or fixed on the receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/18—Mixing in containers to which motion is imparted to effect the mixing
    • B28C5/1825—Mixers of the tilted-drum type, e.g. mixers pivotable about an axis perpendicular to the axis of rotation for emptying
    • B28C5/1856—Details or parts, e.g. drums
    • B28C5/1862—Construction of drum, e.g. provided with mixing blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G33/00—Screw or rotary spiral conveyors
    • B65G33/24—Details
    • B65G33/26—Screws
    • B65G33/265—Screws with a continuous helical surface

Definitions

  • the invention relates to a device for mixing or conveying an abrasive mass with a driven coil, which comprises at least two flat, helical segments adjoining each other in the helical course and has a means for connecting the helical segments, wherein the helical segments form a lap joint, which extends over the Area of the overlapping pads of the helical segments extends.
  • a device of the generic type can be found for example in stationary or mobile mixing drums for mixing mortar or concrete. It is well known that concrete is prefabricated by the manufacturer and transported in special truck mixers, on the frame of a rotatably mounted mixing drum rests to the destination, while the concrete in the mixing drum by means of one or more contained coils is constantly mixed to maintain its fürressbare consistency to keep.
  • the mixing drum is composed of several conical and cylindrical shell rings.
  • the coil made of strip-shaped steel sheet is usually first manually fastened and completed in the composite mixing drum, by sections being formed with its radial outer contour on the inside wall of the mixing drum. is welded.
  • the finished coil then passes in a spiral shape with variable radii along the inner wall of the various shell rings of the mixing drum.
  • a generic device is also found in larger agitators for mix or long augers for bulk material. All devices is common that the coil for manufacturing reasons, such as because of their overall length, due to variable radii of curvature or lack of accessibility during assembly, can not be made in one piece, but is composed of individual helix segments. These spiral segments of sheet steel sections are welded together to form the coil. In this case, a butt joint welding in which the helical segments butt against each other, usually not possible because the required for this tight tolerances in the position of the abutting edges of the helical segments to each other at the weld can not be guaranteed.
  • the helical segments themselves are slightly curved, which may already result in deviations in the connection contour.
  • the helical segments are also to be fastened with the inner or outer contour on curved surfaces, such as cylinder or hollow cylinder jacket surfaces, such as during assembly of the helix on the inner wall of a mixing drum. Therefore, in such applications, the helix is mainly made a so-called lap joint welding of the helical segments, in which the steel plate bands are arranged overlapping and thus no great accuracy of the helical segments connection accuracy is required.
  • the two-sided abutting edges of the helical segments which rest on the surface of the other helical segment during the lap joint welding, are welded to the other helical segment by means of a standard fillet weld.
  • the fillet welds of the helical segments constitute a weak point. They form, over the entire length of the abutting edge of the helix segments, an immediate direct contact surface for the moving mixture, which impinges against the direction of rotation of the helix on the abutment edge or fillet weld surface. This can weaken the cross section of the weld and prematurely release the weld joint of the abutting edge with the surface of the other helical segment, so that finally the connection of the helical segments can completely fail.
  • weld is only partially worn, because then mix can be pressed between the abutting edge and the surface of the other spiral segment and a region of the overlap can be widened.
  • the weld is additionally subjected to tensile stress, which causes further damage.
  • a device and for mixing or conveying concrete mortar as well as a method for reducing the wear of a working edge or working surface of a mortar mixer or conveyor is known.
  • a device for holding mortar is provided on the working edge or a working surface to build up by the hardened mortar on the working edge or the working surface a protective mortar layer.
  • the working edge or working surface refers to the radially inner edge - A -
  • the helix or on the surfaces of the spiral sheet For this purpose, a gauzy reinforcement made of flexible expanded metal strips is placed on the area to be protected and held by spot welding.
  • the mortar fills the openings of the sieve-like expanded metal construction, at the same time the mortar is held during a drum wash in the openings. Once the retained mortar has set, it forms a thin layer of reinforced concrete with the expanded metal screen which protects the helix and helix edge from wear.
  • the document also discloses an application of the solution for other wear-prone inner working surfaces of a mortar mixer, for example, areas of the drum wall.
  • the disadvantage is that on the one hand, the solution is limited only to a setting mix, such as concrete and mortar.
  • the procedure would be very expensive to perform by each of the fillets over their entire length additionally covered manually with an expanded metal strip and attached by spot welding. This requires a lot of production time and thus causes high costs, which calls into question the economy of this design.
  • the invention therefore aims to develop the generic device for mixing or conveying an abrasive mass, such that the service life of the coil is increased by efficient means.
  • the means for connecting the helical segments is arranged integrated in the lap joint.
  • This advantageous arrangement of the connection The helical segments provide a simple, effective and durable bond between the overlapping surfaces of the helical segments without exposing the components of the compound to excessive wear from the abrasive mass.
  • the connection is protected in the lap joint integrated, so that specially takes the material of the helical segments the function of protecting the connection. In this way, only the abutting edges of the lap joint, which are directly exposed to the abrasive mass during rotation of the coil, are subject to wear rather than the concealed connection.
  • the abrasion of the abutting edges is largely irrelevant to the durability of the compound. Over time, the abutting edges are ground so that an oblique face is created, which then dissipates the abrasive mass well and reduces the further wear of the abutting edges.
  • the pointing in the direction of rotation of the helix abutting edge of the lap joint is already chamfered with a corresponding phase, so that the abrasive mass can slide well on the lap joint and the wear of the abutting edge, is kept low from the outset.
  • Both abutting edges of the lap joint designed in such a way.
  • a device can be realized with an even more durable and secure connection of the helical segments.
  • a material connection of the spiral segments provides an insoluble, very strong connection of the materials to be joined together, for example sheet steel, in which the joining surfaces of the materials, mainly by the action of heat and / or pressure, materially unite. These cohesive connections withstand especially the effect of dynamic loads, as they occur at the helix stood.
  • the means for connecting the helical segments of a welded joint, a solder joint or an adhesive bond are inexpensive to produce with little effort and therefore especially for small series assembly by hand, such as in the assembly of the coil in a mixing drum, suitable. These types of connections also offer good repair or repair options.
  • the resistance spot welding has proven to be particularly advantageous.
  • This type of welded joint is limited to the selective welding of the overlapping connecting surfaces, which can be produced by means of a handy spot welding device.
  • This compound requires no welding additives, requires no special preparation of the welds and is done in extremely short welding time.
  • spot welding saves a considerable amount of time compared to other welded joints, which reduces production costs and, not least, the duration of the relatively uncomfortable and unhealthy working hours. situation of the manufacturing personnel during the welding work in the mixing drum.
  • the helical segments in the lap joint corresponding recesses, wherein in the recesses a welded joint can be realized by a Greetsch spall.
  • a molten metallic filler material (solder) is usually introduced with the aid of a flux which not only selectively connects the helix segments after hardening.
  • the solder fills in the liquid state, both the cavities of the recesses and creeps, due to the capillary action, also in the not directly accessible joints between the pads of the helical segments.
  • the melting temperature of the solder is below the melting temperature of the filament segments to be joined, so that this compound allows low operating temperatures and short production times during connection work.
  • the coil is connected to a mixing drum of a truck mixer or a stationary mixer or to a shaft of a stirrer or a screw conveyor.
  • the aforementioned advantages of the invention are particularly significant.
  • FIG Fig. 1 is a perspective view of a truck mixer with a
  • FIG. 2 is a partial view of the mixing drum of the truck mixer with transparent view of two included coils according to the invention
  • FIG. 3 is a sectional view of a lap joint of the helical segments with a welded joint according to the prior art
  • Fig. 4 is a sectional view of a lap joint of the helical segments with a compound according to the invention.
  • a truck mixer 1 with a mixing drum 2 can be seen.
  • a truck mixer 1 is a commercial vehicle on the frame 3, a mixing drum 2 is rotatably mounted for the transport of mortar, concrete or the like.
  • the factory finished concrete is filled by means of a funnel 4 at the loading opening 5 of the mixing drum 2 in this and mixed during transport to the construction site consistency preserving in the rotating mixing drum 2.
  • the discharge of the concrete at the destination can according to the local requirements, for example by means of a conveyor system with swiveling concrete distributor masts 6, as shown in Fig. 1, take place, with which the concrete is pumped from the mixing drum 2 and conveyed via a entrained at the concrete distributor masts on site.
  • the discharge of the concrete by means of a bulk material ramp 7, as shown in Fig. 2, take place.
  • the mixing drum 2 is tilted, so that the concrete on the discharge opening 8 of the mixing drum meets the bulk material ramp 7 and can be unloaded on site.
  • the mixing drum 2 itself consists of several abutting conical and cylindrical shell rings 9 and has one end over a closed bottom 10, which faces the loading or unloading 5.8.
  • Fig. 2 provides a transparent view into the interior of the mixing drum 2 of the truck mixer 1 on two included coils 1 according to the invention. Both coils 11 begin offset position on the bottom 10 of the mixing drum 2 and extend spirally along the inner wall 12 of the mixing drum 2 to the loading or unloading 5.8.
  • the coils 1 1 are driven by the rotatable mixing drum 2, with which they are connected.
  • Each of the helices 1 1 is composed of a plurality of mutually joined helical segments 13, 14, which are made of strip-shaped steel sheet. Width, length and thickness of the structural steel sheet can be approximately 250 mm x 1500 mm x 10 mm by way of example.
  • stepwise attachment of the helices 11 in the mixing drum 2 is an elongated curved edge 15 of the respective helical segment 13,14, which results in the radially outer contour of the helix 11, welded to the inner wall 12 of the mixing drum 2, wherein the adjoining helix segments 13,14 ü overlap over their entire width and form a lap joint 16.
  • FIGS. 3 and 4 such a lap joint 16 of the spiral segments 13, 14 can be seen in detail.
  • 3 shows a sectional view of a welded connection of the spiral segments 13, 14 according to the prior art, namely by means of fillet weld welding.
  • a first fillet weld 17 welds a butt edge 18 of the first filament segment 13 to the surface 19 of the adjoining second filament segment 14 and further a second fillet weld 20 forms a collision edge 21 of the second filament segment 14 with the surface 22 of the first filament segment 13.
  • the fillet welds 17, 20 run along the abutting edges 18,21 over the entire width of the helical segments 13,14.
  • both coil segments 13, 14 overlap.
  • FIG. 4 illustrates in cross-section a connection according to the invention of the helical segments 13, 14 in the lap joint 16. All components of the compound are arranged integrated in the lap joint 16.
  • a welded connection 25 connects by resistance spot welding at a plurality of welding points 26, the connection surfaces 23,24 of the first and second coil segment 13,14 directly to each other. In the sectional For example, only one welding point 26 of the welding points 26 distributed over the connecting surfaces 23, 24 is visible.
  • arrows shown in Fig. 3 and 4 illustrate according to the two possible directions of rotation 27 of the helix 1 1, the corresponding relative directions of movement 27 of the helical segments 13, 14 by the mixing or conveying concrete mass.
  • connection surfaces 23, 24 in a simple and efficient manner, without components of the welded connection 25 projecting beyond the lap joint 16.
  • the necessary connection forces are realized without problems.
  • the welding points 26 are fully integrated in the lap joint 16 and are thus protected from abrasion by the mortar or concrete.
  • the invention is not limited to use in a mixing drum 2 of a truck mixer 1. Rather, it can also be used in other devices for mixing or conveying abrasive materials, such as, for example, for stationary concrete silos, for agitators in concrete works or for overburden conveyors.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

L'invention concerne un dispositif de mélange ou de transport d'une pâte abrasive par une volute motrice qui comprend au moins deux segments de volute plats mutuellement adjacents suivant l'extension de la volute et qui comprend un moyen de liaison des segments de volute. Les segments de volute forment une jonction par superposition qui s'étend sur la région des surfaces de raccordement se superposant des segments de volute. Le problème à la base de l'invention est de transformer le dispositif de type générique de telle sorte que la durée de vie de la volute soit augmentée par des moyens efficaces. Ce problème est résolu en ce que le moyen de liaison des segments de volute (13, 14) est intégré dans la jonction par superposition (16).
PCT/EP2007/000601 2006-01-24 2007-01-24 Dispositif de melange ou de transport d'une pate abrasive WO2007085436A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006003417.1 2006-01-24
DE102006003417A DE102006003417A1 (de) 2006-01-24 2006-01-24 Vorrichtung zum Mischen und Fördern einer abrasiven Masse

Publications (1)

Publication Number Publication Date
WO2007085436A1 true WO2007085436A1 (fr) 2007-08-02

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ID=37989154

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Application Number Title Priority Date Filing Date
PCT/EP2007/000601 WO2007085436A1 (fr) 2006-01-24 2007-01-24 Dispositif de melange ou de transport d'une pate abrasive

Country Status (2)

Country Link
DE (1) DE102006003417A1 (fr)
WO (1) WO2007085436A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103878880A (zh) * 2014-02-21 2014-06-25 中国十七冶集团有限公司 混凝土罐车搅拌方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022125209A1 (de) 2022-09-29 2024-04-04 Schwing Gmbh Großmanipulator
DE102022125201A1 (de) 2022-09-29 2024-04-04 Schwing Gmbh Mobile Baumaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485116A (en) * 1967-04-24 1969-12-23 Tracy T Fender Method and apparatus for forming sectional spiral flights
JPS58179520A (ja) * 1982-04-12 1983-10-20 Mitsubishi Heavy Ind Ltd フイン付伝熱管の製造方法
EP0438852A1 (fr) * 1990-01-26 1991-07-31 McNeilus Truck and Manufacturing, Inc. Système pour mélanger et distribuer du béton
EP0520948A1 (fr) * 1991-06-24 1992-12-30 Peter Wenger Vis transporteuse modulaire, procédé pour sa fabrication et moule de fonderie pour la coulée d'un module
US5378061A (en) * 1991-11-05 1995-01-03 Mcneilus Truck And Manufacturing, Inc. Concrete mixing drum fin structure

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2490215A (en) * 1946-01-10 1949-12-06 Chain Belt Co Mounting for spiral blading within frustoconical mixing chambers
DE2220213A1 (de) * 1972-04-25 1973-11-15 Elba Werk Maschinen Gmbh & Co Mischwerk fuer betonmischer
DE2642801B2 (de) * 1976-09-23 1980-05-29 Hans-Hermann Brandt & Gebr. Buescher Ohg, 5042 Erftstadt VerschleiBschutzbauteile für Verschleiß unterworfene Flächen von Schnekkengängen bei Förderschnecken
IT1110938B (it) * 1979-01-17 1986-01-13 Italiana Forme Acciaio Tamburo per autobetoniera specialmente adatto al confezionamento e al trasporto di calcestruzzi pastosi
DE8004382U1 (de) * 1980-02-19 1980-05-29 Metallgesellschaft Ag, 6000 Frankfurt Werkstuecke mit gepanzerten kanten und/oder flaechen
DE3303971A1 (de) * 1982-02-19 1983-09-08 Fowlerex Pty. Ltd., Artarmon, New South Wales Vorrichtung zum mischen oder foerdern von beton-moertel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485116A (en) * 1967-04-24 1969-12-23 Tracy T Fender Method and apparatus for forming sectional spiral flights
JPS58179520A (ja) * 1982-04-12 1983-10-20 Mitsubishi Heavy Ind Ltd フイン付伝熱管の製造方法
EP0438852A1 (fr) * 1990-01-26 1991-07-31 McNeilus Truck and Manufacturing, Inc. Système pour mélanger et distribuer du béton
EP0520948A1 (fr) * 1991-06-24 1992-12-30 Peter Wenger Vis transporteuse modulaire, procédé pour sa fabrication et moule de fonderie pour la coulée d'un module
US5378061A (en) * 1991-11-05 1995-01-03 Mcneilus Truck And Manufacturing, Inc. Concrete mixing drum fin structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103878880A (zh) * 2014-02-21 2014-06-25 中国十七冶集团有限公司 混凝土罐车搅拌方法

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