EP0245778B1 - Doppeltangentialdüse - Google Patents

Doppeltangentialdüse Download PDF

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Publication number
EP0245778B1
EP0245778B1 EP87106620A EP87106620A EP0245778B1 EP 0245778 B1 EP0245778 B1 EP 0245778B1 EP 87106620 A EP87106620 A EP 87106620A EP 87106620 A EP87106620 A EP 87106620A EP 0245778 B1 EP0245778 B1 EP 0245778B1
Authority
EP
European Patent Office
Prior art keywords
bores
tube
water
dampening
nozzle
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.)
Expired
Application number
EP87106620A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0245778A1 (de
Inventor
Fred Homberg
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.)
Saarbergwerke AG
Original Assignee
Saarbergwerke AG
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 Saarbergwerke AG filed Critical Saarbergwerke AG
Priority to AT87106620T priority Critical patent/ATE45205T1/de
Publication of EP0245778A1 publication Critical patent/EP0245778A1/de
Application granted granted Critical
Publication of EP0245778B1 publication Critical patent/EP0245778B1/de
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
    • E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
    • 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
    • B28C5/02—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions without using driven mechanical means effecting the mixing
    • B28C5/026—Mixing guns or nozzles; Injector mixers

Definitions

  • the invention relates to a wetting nozzle for dams used in underground mining and tunneling, which is installed in the dam building material supply line and is provided with a water connection, with flanges on both sides and tangentially arranged nozzle-shaped bores for the spraying water pipe.
  • Wetting nozzles of this type are used in particular in underground mining and tunnel construction in order to wet the dry, pneumatically brought material to the place of use before it is introduced into the dam and to mix it sufficiently with water in order to solidify the dam building material in this way .
  • Wetting nozzles of this type should supply so much water to the dam building material that as little as possible is released during discharge. Even in the case of granular dam building materials such as anhydrite, sufficiently intensive wetting with water is required to reduce the dust load.
  • Wetting nozzles are known in which nozzle inserts extend into the tube, so that wetting water is usually discharged through the nozzles in the conveying direction. The disadvantages here are the wear occurring on the nozzles and the nozzle holders and the insufficient wetting of the dam construction material.
  • So-called tangential wetting nozzles are used to reduce wear and improve the wetting of the dam building material with water.
  • the water is introduced from two tangentially arranged bores.
  • a flat jet nozzle in the upper pipe cross-section.
  • the disadvantage here is that a separate water connection is necessary for each of the nozzles and that, despite the tangential arrangement of the nozzles, a sufficient mixing effect with the wetting water is not always guaranteed.
  • the costs for the special nozzles, in particular the flat jet nozzle are disadvantageous.
  • the invention has for its object to further improve the wetting of the dam building material in the wetting nozzle and above all to make it even.
  • the tube is designed to form an annular space and the bores connecting the annular space to the delivery space and are arranged one behind the other in several planes.
  • Such a wetting nozzle is surprisingly short and results in a significantly reduced dust load. Due to the small size, easy handling and easy handling are possible. In particular, even if there are several nozzles or bores, the entire wetting nozzle requires only one water connection in each case, because all are supplied with the necessary water uniformly via the annular space. It is also advantageous that there are no internals in the cross-section, so that the abrasive material to be conveyed can also be properly guided through this area without any plug formation. It is also advantageous that special nozzles can be dispensed with entirely and that the reduced wear results in long service lives with little maintenance.
  • the nozzles are arranged facing each other on each level, the outgoing water jets meet and divide up so evenly that an intensive mixing of the material to be conveyed is achieved. This achieves the aforementioned reduction in dust pollution.
  • the water jacket formed on the pipe wall has a positive effect.
  • the tube is designed as a double tube having an outer and inner tube. In this way, the necessary annulus can be achieved easily and without great design effort, even in the dimensions required.
  • the bores are expediently formed and arranged at half the height in the wall of the inner tube in order to ensure that the water jets emanating from the bores set against one another meet in the nozzle highest or lowest, from where the individual water droplets are catapulted into the material to be conveyed .
  • the bores are designed to emit the water jet at an angle, preferably 6 ° .
  • the tangentially positioned bores send out the water jet about a quarter of the circumference of the pipe before the two opposing water jets meet exactly in the middle, ie at the nozzle's highest or lowest.
  • Adequate mixing and wetting success is achieved when four holes are arranged in two planes one behind the other. In the event that the wetting achieved in this way is insufficient, it is either possible to use wetting nozzles with further bores arranged in further planes or to connect another wetting nozzle designed in this way to the first.
  • the second wetting nozzle is expediently arranged offset from the first so that the corresponding bores of the second nozzle also emit their water jet offset from the first nozzle or the bores there.
  • the four bores assigned to a wetting nozzle are each arranged in the opposite direction to discharge each level.
  • the first nozzle combination arranged in the conveying direction discharges in such a way that the two water jets meet in the nozzle top, while the second group of holes is arranged in such a way that the water jets meet in the nozzle deepest and from there their water droplets in the direction of the conveyed material and in catapult this into it.
  • the bores at a distance preferably having a quarter of the total length of the nozzle assign. With such a spacing of the bores there is a uniform and intensive distribution of the water jets and the water droplets that meet. In the case of a conventional nozzle, this means that the bores of the two planes are approximately 3 to 4 cm apart.
  • An expedient embodiment of the invention provides that the tube has two water connections in the form of Stecko DN-20 connections, which are offset from the holes in the annular space.
  • the staggered arrangement of the water connections to the holes ensures an even supply of water to the holes, whereby two water connections optimize this supply.
  • the second being usually closed.
  • the invention provides that the lower water connection can be closed by a plug. The lower water connection serves to flush and empty the entire nozzle after the blowing process. This ensures a long service life for such wetting nozzles.
  • a practical and simple design of the double tube is that in which the outer tube is placed on the inner tube having the flanges.
  • the annular space between the two tubes is formed exclusively in the width that is necessary for the bores to be arranged at a distance.
  • Either the ends of the outer tube are chamfered or the necessary annular space is excluded from the wall of the outer tube, so that the necessary seal at the end of the outer tube can be easily produced from the inner tube.
  • the invention is characterized in particular by the fact that a wetting nozzle having numerous advantages is created, which in particular leads to a significantly reduced dust load, because the dam building material is mixed thoroughly and flies through several such mixing zones, preferably two, before it leaves the wetting nozzle again.
  • the water enters the wetting nozzle at high speed, initially covers about a quarter of the circumference after leaving the bore and hits the jet of water of the assigned bore at the highest or lowest point of the nozzle.
  • the water sprays in a nozzle shape into the center of the delivery chamber, causing intensive mixing.
  • the small dimensions of such wetting nozzles and the possibility of cleaning them quickly and intensively when the respective conveying process is completed are also advantageous. Since a uniform supply of water to the holes is achieved through the annular space, it is also ensured that the two opposing water jets meet at the intended point and with the same intensity, so that the uniform distribution of the two water jets can ensure intensive wetting.
  • the nozzle (I) shown in Fig. I consists of a tube (2), which has flanges (3, 4) at both ends, via which a connection to the dam building material supply line can be produced quickly and without great effort. Via a water connection (5) which opens into the outer tube (6), the nozzles or bores, which are not visible here in detail, are evenly supplied with water.
  • the nozzle-shaped end of the bores (9, lo) is indicated in Fig. 2, with Figs. 3 and 4 showing the entire nozzle-shaped course of the bores (9, lo and 15, 16).
  • the bores (9, 15 and 10, 16) forming a group are each assigned spaced planes, which ensures a correspondingly intensive wetting of the conveyed material which flows through the conveying space (12) in the conveying direction (13).
  • a further water connection (14) is provided on the lower circumference of the outer tube (6), but is generally not required for supplying the water, but rather is provided for rinsing and cleaning processes and is usually closed by a stopper.
  • the water jets leaving the nozzles (9, 15) in the direction of the water connection (5) meet approximately at the level of the water connection but offset in the conveying direction (13), the water spraying apart in a nozzle shape due to the collision.
  • Both water jets form an overall effective water film on the pipe wall, which also has a positive effect. The water film wraps itself around the material to be conveyed, thus further reducing dust pollution.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Nozzles (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Cyclones (AREA)
EP87106620A 1986-05-13 1987-05-07 Doppeltangentialdüse Expired EP0245778B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87106620T ATE45205T1 (de) 1986-05-13 1987-05-07 Doppeltangentialduese.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3616082 1986-05-13
DE19863616082 DE3616082A1 (de) 1986-05-13 1986-05-13 Doppeltangentialduese

Publications (2)

Publication Number Publication Date
EP0245778A1 EP0245778A1 (de) 1987-11-19
EP0245778B1 true EP0245778B1 (de) 1989-08-02

Family

ID=6300725

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87106620A Expired EP0245778B1 (de) 1986-05-13 1987-05-07 Doppeltangentialdüse

Country Status (4)

Country Link
EP (1) EP0245778B1 (enExample)
AT (1) ATE45205T1 (enExample)
DE (2) DE3616082A1 (enExample)
ES (1) ES2010688B3 (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3815425A1 (de) * 1988-05-06 1989-11-16 Deutsche Forsch Luft Raumfahrt Verfahren zur ermittlung der zugfestigkeit von duennen einzelfasern
CN103963162B (zh) * 2014-05-23 2016-06-29 山东华联矿业股份有限公司 立式砂仓造浆装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE460796C (de) * 1928-06-05 Adolf Wolfsholz Verfahren zum Aufspritzen von Moertel o. dgl.
FR2302789A1 (fr) * 1975-03-06 1976-10-01 Campenon Bernard Sa Perfectionnement aux lances a beton
CH583838A5 (en) * 1975-04-07 1977-01-14 Heller Walter J Ag Bauunterneh Concrete spraying gun with supply connection - has wear resistant plastics nozzle connected to water and cement supply
US4095748A (en) * 1975-07-04 1978-06-20 Kanebo, Ltd. Apparatus for mixing a cement slurry with a glass fiber
US4415275A (en) * 1981-12-21 1983-11-15 Dietrich David E Swirl mixing device
DE3100571A1 (de) * 1981-01-10 1982-08-12 Bayer Ag, 5090 Leverkusen Verfahren zur herstellung von elastischem beton oder moertel
DE8315702U1 (de) * 1983-05-28 1984-01-19 Sterzel, Erich, 4270 Dorsten Abflusskanal

Also Published As

Publication number Publication date
EP0245778A1 (de) 1987-11-19
DE3616082C2 (enExample) 1988-03-10
DE3760395D1 (en) 1989-09-07
DE3616082A1 (de) 1987-11-19
ATE45205T1 (de) 1989-08-15
ES2010688B3 (es) 1989-12-01

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