EP0662875B1 - Melangeur-convoyeur - Google Patents

Melangeur-convoyeur Download PDF

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Publication number
EP0662875B1
EP0662875B1 EP93921847A EP93921847A EP0662875B1 EP 0662875 B1 EP0662875 B1 EP 0662875B1 EP 93921847 A EP93921847 A EP 93921847A EP 93921847 A EP93921847 A EP 93921847A EP 0662875 B1 EP0662875 B1 EP 0662875B1
Authority
EP
European Patent Office
Prior art keywords
duct
conveying
mixing tank
pressure
air
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 - Lifetime
Application number
EP93921847A
Other languages
German (de)
English (en)
Other versions
EP0662875A1 (fr
Inventor
Karl Schlecht
Manfred Kempf
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.)
Putzmeister Moertelmaschinen GmbH
Original Assignee
Putzmeister 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25919119&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0662875(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE4301474A external-priority patent/DE4301474A1/de
Application filed by Putzmeister AG filed Critical Putzmeister AG
Publication of EP0662875A1 publication Critical patent/EP0662875A1/fr
Application granted granted Critical
Publication of EP0662875B1 publication Critical patent/EP0662875B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B28C5/08—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
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/1223—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers discontinuously operating mixing devices, e.g. with consecutive containers
    • B28C5/123—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers discontinuously operating mixing devices, e.g. with consecutive containers with pressure or suction means for discharging

Definitions

  • the invention relates to a device for mixing and conveying mortar, concrete and similar thick matter with a mixing vessel, a delivery line connected to the mixing vessel near the ground and an upper air line and lower air line which can be pressurized with compressed air via a compressor, the upper air line leading into the air space of the upper boiler area and the under-air line opens into the delivery line at a connection point near the boiler.
  • the invention further relates to a method for conveying thick matter from the mixing vessel into the delivery line.
  • a throttle designed as a valve is arranged for the purpose of correct distribution the compressed air can be adjusted by hand.
  • the compressor which is designed as a screw compressor, is switched on and off via a shut-off valve arranged in the suction line. Since the device is often operated by untrained personnel, the throttles arranged in the upper air line and in the lower air line are once placed in a predetermined position and left in this position when the system is started up.
  • the mixing tank filled with the material to be mixed and conveyed is closed pressure-tight and the compressor is opened by opening of the shut-off valve in the suction line switched on.
  • the engine speed is increased at the same time.
  • the delivery pressure of about 4 to 5 bar gradually builds up in the boiler, especially via the upper air line.
  • this pressure build-up is delayed by the fact that the compressed air supplied via the sub-air line can initially escape via the delivery line without conveying mixed material until it is pressed into the delivery line via the boiler pressure material and the injection air supplied via the sub-air line is used to convey the plugs.
  • One consequence of this is a not inconsiderable lengthening of the conveying process and thus increased boiler wear and fuel consumption.
  • the compressed air supply is switched off again when a boiler filling is discharged and the conveyance is ended. As soon as the boiler pressure falls below 1 bar, the boiler can be relieved by opening a vent valve and opened for refilling.
  • the agitator which is driven by the compressor motor, continues to run when the compressed air supply is switched off and ensures rapid mixing of the material to be mixed and conveyed during the mixing phase.
  • the object of the invention is to develop a simplified device and a method for conveying thick matter which does not require trained personnel through self-regulation.
  • the solution according to the invention is based on the idea of controlling the compressed air supply to the lower air line and to the upper air line in such a way that the pressure build-up and the material transport in the delivery line are optimized during the entire delivery phase.
  • a shut-off or directional valve designed as an opener is arranged in the sub-air line, which is connected on the pilot side to the connection point of the delivery line or to the air space of the upper boiler area and is responsive when a predetermined control pressure is exceeded.
  • the connection to the air space of the upper boiler area can be made via the overhead air line.
  • a bypass line connected in parallel with the shut-off or directional valve in which a throttle element is arranged. Measured air passes from the compressor to the delivery line via the throttle element.
  • the measuring air is preferred branched off on the delivery line side of the throttle element for pilot control of the opener, so that it is ensured that the break contact is only turned on when material from the mixing vessel is pressed into the delivery line and the pressure required for the discharge is built up in the lower air line (injection line).
  • the break contact is advantageously controlled when a control pressure of 1.5 to 2.5 bar is exceeded and is blocked when the pressure falls below 1.4 to 0.5 bar.
  • a preferred or alternative embodiment of the invention provides that a shut-off or directional valve designed as a closer is arranged in the upper air line connected on the pilot side to the lower air line or the air space of the upper boiler area, which responds at a predetermined control pressure.
  • a bypass line connected in parallel to the shut-off or directional valve is also expediently provided in the upper air line, in which a throttle element is arranged.
  • the main task of the throttle element here is to keep the boiler-side part of the overhead air line free of impurities or to blow it free.
  • the pressure tap for controlling the upper air valve is conveniently located on the compressor side of the throttle element and therefore communicates directly with the lower air line.
  • the lowest response pressure of the closer in the upper air line is therefore chosen to be higher than the highest response pressure of the opener in the lower air line. It has proven to be particularly advantageous if the closer is blocked when a control pressure of 4 to 5 bar is exceeded and is controlled again when the pressure falls below 3.9 to 3 bar.
  • the mixing and conveying devices shown in the drawing in the form of circuit diagrams essentially consist of a mixing vessel 1 which can be pressurized with compressed air via a compressor 8, 11 and which has an agitator driven by a shaft 2.
  • the compressor 8 and the agitator 2 are driven by a common motor 7, which can be designed as a diesel motor or as an electric motor.
  • the agitator shaft 2 is driven via the output shaft 21 of the motor 7, a V-belt drive 22, a cardan shaft 23 and a reduction gear 6.
  • the compressor 8 receives its air through a suction line 18, in which a shut-off valve 19 and an air filter 29 are arranged.
  • Oil is injected on the suction side into the compressor 8, which is designed as a screw compressor, and enters the housing of the compressor 8 via an oil circuit, not shown in the drawing, from the oil separator 11 or from an oil cooler connected downstream thereof.
  • the oil-air mixture passes through a check valve 10 arranged in line 9 into oil separator 11, from whose filter cartridge 12 largely oil-free compressed air flows into pressure line 13.
  • An under-air line 14 branches off from the pressure line 13 and opens into the delivery line 24 communicating with the mixing vessel 1 near the bottom.
  • An upper air line 15 branches off from the pressure line 13 and opens into the air space of the mixing vessel 1 in the upper region at point 25.
  • a directional valve 26 designed as a minimum pressure valve 26 in the lower air line 14, the control input of which communicates with the air space of the mixing boiler 1 via the upper air line and which controls when a predetermined minimum pressure in the mixing tank is reached.
  • a throttle 16 is also arranged in the upper air line and is adjusted by hand for the purpose of correct air distribution when the device is adjusted and remains in this position.
  • the check valves 27 ', 27'' ensure that no air and thus no impurities 13 can get into the pressure lines 14, 15 from the mixing vessel 1.
  • a spring-centered directional control valve 26 which is designed as an opener, is arranged in the lower air line and can be acted upon on the pilot side by the pressure prevailing at the connection point of the delivery line 24 and that the compressed air supply to the delivery line 24 when a predetermined pressure is exceeded at the connection point switches on and blocks when the pressure falls below a specified value.
  • a bypass line 29 with a measuring throttle 28 ' is connected in parallel to the directional control valve 26.
  • a spring-centered directional valve 30 designed as a closer, the pilot control input of which is connected via the lower air line 14 to the injection point of the delivery line 24 and to which a bypass line with throttle element 28 ′′ is connected in parallel.
  • the lid 4 and the vent valve 5 are closed and then the shut-off valve 19 is preferably opened by hand.
  • the pressure then increases slowly as a result of the pre-compression in the dead space and in the oil separator 11, which has the advantage that the agitator 2 is not overstressed or blocked by a sudden compression of the mixed material and an associated stiffening of the consistency.
  • the opener 26 in the lower air line 14 is initially closed, so that the pressure build-up in the mixing vessel 1 takes place only via the upper air line 15 and the open closer 30.
  • the compressor is switched off manually or automatically by closing the shut-off valve 19. Due to the decreasing pressure of the boiler, the opener 26 then returns to its closed position. As soon as the boiler pressure falls below a value of 1 bar, the vent valve 5 is opened either manually or automatically, so that the remaining air can quickly escape and the lid 4 can be opened for a new charge.
  • the invention relates to a compressed air conveying device for thick materials, such as mortar or concrete.
  • the compressed air conveyor comprises a mixing kettle 1 having a motor-driven mixing unit 2, a delivery line 24 connected to the mixing kettle 1 near the ground, and in each case an under air line 14 and an upper air line 15 which can be pressurized with compressed air via a compressor 8, 11, 12. while the sub-air line 14 opens into the delivery line 24 at an injection point.
  • the injection air supplied via the under-air line 14 is only switched on at a predetermined minimum resistance in the delivery line while the compressed air supply in the boiler 1 is blocked when a preset maximum resistance in the delivery line 24 is reached.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Accessories For Mixers (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Claims (14)

  1. Appareil pour mélanger et transporter du mortier, du béton ou des liquides épais analogues, comprenant une cuvemélangeuse (1), une conduite de refoulement (24) raccordée à la cuve-mélangeuse (1) à proximité du fond, et respectivement une conduite d'air supérieure (15) et une conduite d'air inférieure (14) pouvant être alimentées en air comprimé par l'intermédiaire d'un compresseur (8, 11), la conduite d'air supérieure débouchant dans l'espace d'air de la partie supérieure de la cuve et la conduite d'air inférieure débouchant dans la conduite de refoulement (24) à un point de raccordement a proximité de la cuve, caractérisé en ce que dans la conduite d'air inférieure (14) est disposé une soupape d'arrêt ou un distributeur (26) conformé en élément d'ouverture qui est raccordé du côté commande pilote au point de raccordement de la conduite de refoulement (24) ou de l'espace d'air de la partie supérieure de la cuve, et qui répond lors du dépassement d'une pression de commande prédéterminée.
  2. Appareil selon la revendication 1, caractérisé en ce que l'élément d'ouverture (26) est relié à la conduite d'air supérieure (15) du côté commande pilote.
  3. Appareil selon la revendication 1, caractérisé en ce qu'il comprend une conduite de dérivation (29) montée en parallèle avec la soupape d'arrêt ou le distributeur (26), dans laquelle est inséré un élément d' étranglement (28').
  4. Appareil selon l'une des revendications 1 à 3, caractérisé en ce que l'élément d'ouverture est ouvert lors du dépassement d'une pression de commande de 1,5 à 2,5 bars et bloqué lorsque la pression de commande descend en dessous de 1,4 à 0,5 bar.
  5. Appareil selon l'une des revendications 1 à 4, caractérisé en ce que dans la conduite d'air supérieure (15) est disposé une soupape d'arrêt ou un distributeur (30) conformé en élément de fermeture qui est raccordé du côté commande pilote à la conduite d'air inférieure (14) ou à l'espace d'air de la partie supérieure de la cuve-mélangeuse (1), et qui répond à une pression de commande prédéterminée.
  6. Appareil pour mélanger et transporter du mortier, du béton ou des liquides épais analogues, comprenant une cuve-mélangeuse (1), une conduite de refoulement (24) raccordée à la cuve-mélangeuse (1) à proximité du fond, et respectivement une conduite d'air supérieure (15) et une conduite d'air inférieure (14) pouvant être alimentées en air comprimé par l'intermédiaire d'un compresseur (8, 11), la conduite d'air supérieure débouchant dans l'espace d'air de la partie supérieure de la cuve et la conduite d'air inférieure débouchant dans la conduite de refoulement (24) à un point de raccordement à proximité de la cuve, caractérisé en ce que dans la conduite d'air supérieure (15) est disposé une soupape d'arrêt ou un distributeur (30) conformé en élément de fermeture qui est raccordé du côté commande pilote à la conduite de commande inférieure (14) ou à l'espace d'air de la partie supérieure de la cuve (1), et qui répond à une pression de commande prédéterminée.
  7. Appareil selon la revendication 5 ou 6, caractérisé en ce qu'il comprend une conduite de dérivation montée en parallèle avec la soupape d'arrêt ou le distributeur (30), dans laquelle est inséré un élément d' étranglement (28'').
  8. Appareil selon l'une des revendications 5 à 7, caractérisé en ce que la pression de réponse maximale de l'élément d'ouverture (26) dans la conduite d'air inférieure (14) est inférieure à la pression de réponse minimale de l'élément de fermeture (30) dans la conduite d'air supérieure (15).
  9. Appareil selon l'une des revendications 5 à 8, caractérisé en ce que l'élément de fermeture (30) est bloqué lors du dépassement d'une pression de commande de 4 à 5 bars et qu'il s'ouvre à nouveau lorsque ladite pression de commande descend en dessous de 3,9 à 3 bars.
  10. Procédé pour amener des liquides épais tels que du mortier ou du béton, de la cuve mélangeuse (1) dans une conduite de refoulement (24) raccordée dans la partie inférieure de la cuve-mélangeuse (1), dans lequel un espace d'air supérieur de la cuve-mélangeuse (1) et un point d'injection de la conduite de refoulement (24) sont alimentés en air comprimé à partir d'un compresseur commun (8, 11), caractérisé en ce que l'amenée de l'air comprimé à la conduite de refoulement est déclenchée automatiquement lors du dépassement d'une pression prédéterminée au point d'injection de la conduite de refoulement (24) ou dans l'espace d'air supérieur de la cuve-mélangeuse (1), et bloquée en cas de dépassement vers le bas d'une pression prédéterminée.
  11. Procédé selon la revendication 10, caractérisé en ce que l'amenée de l'air comprimé dans l'espace d'air supérieur de la cuve-mélangeuse (1) est bloquée automatiquement lors du dépassement d'une pression prédéterminée au point d'injection de la conduite de refoulement (24) ou dans l'espace d'air supérieur de la cuve-mélangeuse (1), et déclenchée à nouveau en cas de dépassement vers le bas d'une pression prédéterminée.
  12. Procédé pour amener des liquides épais tels que du mortier ou du béton, d'une cuve-mélangeuse (1) dans une conduite de refoulement (24) raccordée à la partie inférieure de la cuve-mélangeuse (1), dans lequel un espace d'air supérieur de la cuve-mélangeuse (1) et un point d'injection de la conduite de refoulement (24) sont alimentés en air comprimé à partir d'un compresseur commun (8, 11), caractérisé en ce que l'amenée de l'air comprimé dans l'espace d'air supérieur de la cuve-mélangeuse (1) est bloquée automatiquement lors du dépassement d'une pression prédéterminée au point d'injection de la conduite de refoulement (24) ou dans l'espace d'air supérieur de la cuve-mélangeuse (1) et déclenchée à nouveau en cas de dépassement vers le bas d'une pression prédéterminée.
  13. Procédé selon la revendication 10 ou 11, caractérisé en ce que l'amenée de l'air comprimé à la conduite de refoulement (24) est déclenchée lors du dépassement d'une pression de 1,5 à 2,5 bars au point d'injection de la conduite de refoulement (24) et bloquée lorsque cette pression descend en dessous de 1,4 à 0,5 bar.
  14. Procédé selon l'une des revendications 11 à 13, caractérisé en ce que l'amenée de l'air comprimé à l'espace d'air supérieur de la cuve-mélangeuse (1) est bloquée lors du dépassement d'une pression de 4 à 5 bars au point d'injection de la conduite de refoulement (24) et déclenchée à nouveau lorsque ladite pression descend en dessous de 3,9 à 3 bars.
EP93921847A 1992-10-02 1993-09-24 Melangeur-convoyeur Expired - Lifetime EP0662875B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4233160 1992-10-02
DE4233160 1992-10-02
DE4301474A DE4301474A1 (de) 1992-10-02 1993-01-21 Misch- und Fördergerät
DE4301474 1993-01-21
PCT/EP1993/002593 WO1994007667A1 (fr) 1992-10-02 1993-09-24 Melangeur-convoyeur

Publications (2)

Publication Number Publication Date
EP0662875A1 EP0662875A1 (fr) 1995-07-19
EP0662875B1 true EP0662875B1 (fr) 1997-12-10

Family

ID=25919119

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93921847A Expired - Lifetime EP0662875B1 (fr) 1992-10-02 1993-09-24 Melangeur-convoyeur

Country Status (8)

Country Link
EP (1) EP0662875B1 (fr)
AT (1) ATE160967T1 (fr)
AU (1) AU5122293A (fr)
CZ (1) CZ287601B6 (fr)
ES (1) ES2111182T3 (fr)
PL (1) PL172465B1 (fr)
SK (1) SK279890B6 (fr)
WO (1) WO1994007667A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103878881A (zh) * 2014-03-05 2014-06-25 盘锦兴海宏大发光科技有限公司 双发泡泡沫混凝土设备

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110201580A (zh) * 2019-06-27 2019-09-06 佛山市南海东方澳龙制药有限公司 膏剂的混合配制设备及方法
CN111941638B (zh) * 2020-09-10 2021-09-07 广东洁冠科技有限公司 一种冶炼废弃物制砖方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB831658A (en) * 1956-01-12 1960-03-30 Max Marion True Mobile mixers of the type carrying spray or other delivery means for concrete or the like
DE2946813C2 (de) * 1979-11-20 1982-07-08 Karl Dipl.-Ing. 7000 Stuttgart Schlecht Misch- und Fördergerät
DE3013373C2 (de) * 1980-04-05 1986-09-11 Karl Dipl.-Ing. 7000 Stuttgart Schlecht Misch- und Fördergerät
DE3836930A1 (de) * 1988-10-29 1990-05-03 Putzmeister Maschf Misch- und druckluftfoerdergeraet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103878881A (zh) * 2014-03-05 2014-06-25 盘锦兴海宏大发光科技有限公司 双发泡泡沫混凝土设备
CN103878881B (zh) * 2014-03-05 2016-04-13 盘锦兴海宏大发光科技有限公司 双发泡泡沫混凝土设备

Also Published As

Publication number Publication date
PL308210A1 (en) 1995-07-24
WO1994007667A1 (fr) 1994-04-14
EP0662875A1 (fr) 1995-07-19
SK42695A3 (en) 1995-08-09
ATE160967T1 (de) 1997-12-15
ES2111182T3 (es) 1998-03-01
CZ72495A3 (en) 1995-09-13
PL172465B1 (pl) 1997-09-30
SK279890B6 (sk) 1999-05-07
CZ287601B6 (en) 2001-01-17
AU5122293A (en) 1994-04-26

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