EP0315750A1 - Pompe pour matière épaisse - Google Patents

Pompe pour matière épaisse Download PDF

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Publication number
EP0315750A1
EP0315750A1 EP88114734A EP88114734A EP0315750A1 EP 0315750 A1 EP0315750 A1 EP 0315750A1 EP 88114734 A EP88114734 A EP 88114734A EP 88114734 A EP88114734 A EP 88114734A EP 0315750 A1 EP0315750 A1 EP 0315750A1
Authority
EP
European Patent Office
Prior art keywords
pump according
shut
opening
wall
housing
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.)
Granted
Application number
EP88114734A
Other languages
German (de)
English (en)
Other versions
EP0315750B1 (fr
Inventor
Hartmut Dr.-Ing. Benckert
Hellmut Hurr
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 Concrete Pumps GmbH
Original Assignee
Putzmeister Werk Maschinenfabrik 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 Putzmeister Werk Maschinenfabrik GmbH filed Critical Putzmeister Werk Maschinenfabrik GmbH
Publication of EP0315750A1 publication Critical patent/EP0315750A1/fr
Application granted granted Critical
Publication of EP0315750B1 publication Critical patent/EP0315750B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • F04B15/023—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous supply of fluid to the pump by gravity through a hopper, e.g. without intake valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0019—Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers
    • F04B7/0034—Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers and having an orbital movement, e.g. elbow-pipe type members

Definitions

  • the invention relates to a thick matter pump with at least two alternately operating delivery cylinders opening into front end openings in a material feed container, with a delivery cylinder arranged within the material feed container, alternately connectable on the inlet side to the openings of the feed cylinder and opening the other opening and connecting the outlet side to a delivery line , and with a shut-off device arranged behind the pipe switch in the conveying direction.
  • Pumps of this type serve to convey concrete and other pulpy masses, such as, for example, overburden with water in tunnel constructions or coal dust with water or heating oil in coal-fired systems.
  • the shut-off device in the pressure pipe enables working against high pressure without the risk of material backflow during the switching of the pipe switch as well as performing a compression stroke before the actual delivery stroke.
  • the S-shaped swivel tube comes into consideration as the pipe switch. Basically, however, the use of U-shaped swivel tubes (trunk turnouts), rock turnouts and downpipes is within the scope of the invention.
  • shut-off elements in the region of the delivery line, which can be designed, for example, as a seat valve, flat slide valve, flapper valve or check valve.
  • the first three Shut-off devices are positively controlled, while the check valve responds passively to the pressure in the delivery line when the pressure in the pipe switch drops. All these known shut-off devices have in common that they are arranged outside the material feed container. In the event of wear, these shut-off elements cause a leakage of the conveyed material, which leads to contamination of the surroundings of the shut-off element and the pump.
  • the invention has for its object to develop a slurry pump with shut-off device, which ensures a reliable shut-off of the flow without the risk of pollution of the environment.
  • the invention is based on the knowledge that the occurrence of leaks cannot be avoided on shut-off elements for conveyed goods made of abrasive thick matter with solid and liquid components, even with a large encapsulation effort, because of the inevitable signs of wear. Accordingly, it is proposed according to the invention to arrange the shut-off device in a housing which is connected or can be connected to the material feed container for the purpose of returning the material.
  • the housing is separated from the material feed container by a partition having a passage opening in its lower region and has an incline to the through opening on the bottom of the housing.
  • a positive conveyor preferably a screw conveyor
  • the housing designed as a retrofit unit has a connection stub that can be connected to the outlet side stub of the pipe switch on the inlet side of the shut-off member and a material return stub that can preferably be connected to the bottom region of the material feed container via a connection duct. Due to the leakage, only fine parts emerge from the shut-off device into the housing, while there are also large parts in the material feed container. In order to prevent coarse parts from getting into the housing, it has proven expedient to automatically block the flow of material from the material feed container towards the housing, for example by means of a non-return valve.
  • the pipe switch which is preferably in the form of an S-shaped swivel tube, is pivotally mounted on the outlet side in the area of a wall duct on the partition, while the feed line is connected to a further wall duct located in an outer wall opposite the partition.
  • a tube piece forming the shut-off element connectable to the two wall bushings and displaceable or pivotable with respect to at least one of the wall bushings, is also arranged in the housing.
  • the pipe section can be designed as a preferably S-shaped swivel pipe, the outlet-side end of which is pivotally mounted in the region of the wall duct of the outer wall and the inlet-side end of which has a closure plate which is arranged next to its inlet opening and which alternates with the inlet opening when the swivel pipe is pivoted back and forth the outlet opening of the pipe switch in the area of the wall duct reaches the partition.
  • the S-shaped pipe section can additionally be mounted with a shaft aligned axially to its outlet end in a swivel bearing arranged on the partition.
  • the pipe section can be pivoted by means of a hydraulically actuated drive mechanism that engages at its outlet-side end, preferably arranged on the outside of the housing.
  • the pipe piece is formed by an opening in a pivoting slide which is arranged in the housing so as to be pivotable about an axis parallel to the passage axes of the wall bushings, such that when pivoting back and forth the opening and a closure part of the pivoting slide alternately in front the openings on the housing side of the wall bushings.
  • the wall bushings arranged in the partition and the outer wall of the housing are expediently axially aligned with one another.
  • a wear plate provided with a passage opening and a closure surface is detachably arranged, which with its free The outer surface rests against a wear ring arranged interchangeably in the area of the adjacent wall bushing.
  • a wear plate provided with a passage opening and a closure surface can also be detachably arranged on at least one inside wall surface in the area of the wall bushing, against the free outer surface of which there is a wear ring which is exchangeably arranged in the area of the inlet and outlet opening of the pivoting slide opening.
  • the wear ring In order to ensure an automatic sealing of the wear parts abutting against each other during each pressure stroke, the wear ring lies against an annular shoulder that limits the opening or the wall lead-through with an elastically flexible sealing ring with a larger inner diameter. Since the wear ring protrudes beyond the wall surface in question, an undesirable material leakage can occur when the swivel plate is switched between its two end positions via the gap next to the wear ring.
  • a locking plate opposite the wear plate, at least in the pivoting area of the opening can preferably be detachably arranged laterally next to the wear ring protruding beyond the wall surface in question, the wall thickness of which, if appropriate with a small undersize, essentially corresponds to the protruding height of the wear ring.
  • the wear plate and / or the locking plate expediently have a kidney-shaped outline.
  • the pivoting slide is advantageously connected in a rotationally fixed manner to a drive shaft forming the pivot axis, which in turn is preferably connected to the drive shaft Is arranged outside the housing, hydraulically actuated drive mechanism is pivotable.
  • the reversing of the shut-off element from the closed position into the open position can be carried out in accordance with an adjustable pre-compression pressure in the pipe switch, in particular in accordance with a differential pressure between the delivery line and the pipe switch.
  • the shut-off device is expediently reversed in the pipe switch when a pre-compression pressure corresponding to the pressure in the delivery line is reached.
  • this can be achieved in a particularly simple manner in that the shut-off element can be displaced to a limited extent in the direction of its pivot axis in the closed position under the action of the differential pressure between the pipe switch and the delivery line, and in that a sensor which responds to the displacement position is provided for reversing the shut-off element.
  • the delivery gap can be filled in that an auxiliary cylinder with its pressure connection directly into the delivery line is arranged behind the shut-off device in the conveying direction, the volume of which is a fraction of the volume of the two delivery cylinders and that during the locked state of the Shut-off device for executing a conveying stroke is controllable and can be acted upon by the conveyed material from the conveying line following the conveying stroke by executing an aspirating stroke.
  • the auxiliary cylinder expediently opens at an angle into the conveying line with a component in the conveying direction.
  • the delivery stroke of the auxiliary cylinder is preferably dimensioned such that the delivery gap occurring between the delivery strokes of the two delivery cylinders during the shut-off time is compensated for according to the delivery quantity and time.
  • the delivery stroke of the auxiliary cylinder is expediently triggered before the shut-off element is completely blocked, while the suction stroke of the auxiliary cylinder can be triggered after the shut-off element has been opened, preferably after it has been completely emptied. This avoids fluctuations in the delivery rate and the formation of a gradually hardening plug in the auxiliary cylinder.
  • the suction stroke can either be controlled externally or under the influence of the pressure prevailing in the delivery line.
  • a pipe switch 12 designed as an S-shaped curved swivel tube, which is pivotably mounted about a horizontal axis 18 extending between the outer wall 14 and the partition wall 16.
  • openings 20 ', 20' behind which delivery cylinders 22 ', 22' are flanged which can be controlled in opposite directions in the delivery direction or suction direction via hydraulic cylinders 24, 24 '(Fig. 5).
  • the swivel tube 12 is pivoted with its inlet opening 26 alternately in the pump cycle in front of the opening 20 ', 20' of the delivery cylinder performing the delivery stroke, while the opening of the delivery cylinder performing the intake stroke is free to take up material from the material feed container.
  • the swivel tube 12 is connected to a delivery line 40 via a wall duct 30 in the partition 16, a shut-off element 32 arranged in the housing 34 and a wall duct 36 in the outer wall 38 of the housing 34.
  • the shut-off element 32 is designed as an S-shaped pivoted swivel tube 42, which extends around a horizontal axis 44 extending between the partition 16 and the outer wall 38 by means of a hydraulically actuated swivel mechanism 46 ', 46 ⁇ is pivotable back and forth.
  • the swivel mechanism 46 ' is arranged in a protective box 48 within the material feed container, while in the case of the exemplary embodiment according to FIG. 1a, a swivel mechanism 46' arranged outside the material feed container 10 and the housing 34 is provided.
  • the housing 34 is accessible from above via a removable cover 50 for maintenance and repair purposes.
  • the swivel tube 42 has on its side facing the partition 16 a laterally projecting closure plate 52 which is braced by a rod 54 with the swivel tube.
  • the closure plate 52 In the locked position of the swivel tube 52, the closure plate 52 reaches the housing side in front of the opening 30 'in the partition 16 and thereby closes the pressure outlet of the pipe switch 12. This, on the one hand, prevents backflow of conveyed material from the conveying line 40.
  • the pressurized feed cylinder can carry out a compression stroke which leads to a pre-compression before the shut-off device 32 is switched through to the feed line 40.
  • the swivel tube 42 is sealed off from the swivel tube 12 in the area of the wall duct 30 via automatically sealing wear parts 56, 58, the position of the automatically sealing ring 56 with respect to the stationary wear part 58 also being able to be exchanged.
  • the housing 34 is connected to the material feed container 10 via an inclined bottom 62 and a passage opening 60 in the partition wall 16 for the purpose of material return.
  • the returned material is then pumped into the delivery line 40 together with the material filled in via the feed shaft 64.
  • a non-return valve 61 is arranged in the area of the passage opening 60.
  • FIGS. 3 and 4 differs from the exemplary embodiment according to FIGS. 1 and 2 in the more compact design of the shut-off element 32.
  • a pivoting slide 66 is provided there, which is arranged between the partition wall 16 and the outer wall 38 extending horizontal axis 44 'can be pivoted back and forth between two end positions by a hydraulically actuated pivot mechanism 46' arranged outside the housing 34.
  • the Shwenkschieber 66 has by means of a clamping device 68 on the axle shaft 44 'non-rotatably, a circular opening 69 and a closure surface 71 having pivot body 70, on the broad sides of which a kidney-shaped wear plate 72 with passage opening 74 is interchangeably arranged.
  • the plates 72 can against each other in the event of wear be replaced.
  • the swivel body 70 is arranged between two automatically sealing under the action of the delivery pressure wear rings 76, which are supported by elastic sealing rings 78 against the wall bushings 30 and 36 in the region of the openings 30 'and 36'.
  • the automatic sealing function is achieved by the larger inner diameter of the sealing rings 78 compared to the wear rings 76. Since the wear rings 76 protrude somewhat beyond the partition 16 or the outer wall 38 towards the interior of the housing, a gap is formed between the relevant housing wall parts and the wear plates 72, through which material can get into the housing 34 from the tube interior during the switching process.
  • a blocking plate 80 which bridges this gap, is arranged on the inside of the relevant housing walls and fulfills a sealing function during the switching process. This locking plate 80 is also expediently exchangeable because of the wear that occurs there.
  • the shaft 44 ' is limited axially displaceable together with the pivoting slide 66. Accordingly, a certain axial play must be provided in the area of the locking plates 80 and the sealing rings 78. Furthermore, a sensor responsive to the axial displacement position is provided on the outside of the housing. With this arrangement, it is possible that the pivoting slide 66 in its closed position under the action of the differential pressure prevailing between the pipe switch 12 and the delivery line 40 can be displaced to a limited extent in the direction of its pivot axis, and that the sensor 88, which responds to the displaced position, detects the shut-off device from the closed position reversed into the open position when the pre-compression pressure in the pipe switch 12 corresponds to the counter pressure in the delivery line 40.
  • the inclined housing base 62 in turn leads to a passage opening 60 in the partition 16 through which leakage material can be returned to the material feed container and can be conveyed away from there via the pump.
  • the diverter 12 and the shut-off device 32 are switched to free passage.
  • the shut-off element 32 is controlled in the closed position by an electrically or hydraulically emitted signal, while the diverter 12 is switched to the other delivery cylinder when the shut-off element 32 is closed. This ensures that no material to be conveyed can flow back from the conveying line 40 into the material feed container 10 during the switching of the pipe switch 12.
  • the shut-off device 32 is controlled again in its open position. The new delivery stroke is triggered either before or after the shutoff member 32 is opened.
  • the new delivery stroke must first be driven against the closed shut-off device 32. Only when a given pressure, e.g. the pressure in the delivery line 40 is reached, the shut-off device 32 is opened. This prevents backflow. In the shut-off mechanisms described, it is ensured that the material plug remaining in the tubular shut-off elements 42 and 66 during the switching process is completely carried along with the next conveying stroke.
  • a given pressure e.g. the pressure in the delivery line 40
  • a two-cylinder pump opens into the delivery line 40 behind the pressure port of the material feed container 10 equipped with a shut-off element 32, the pressure port of an auxiliary cylinder 84 with a relatively small delivery volume.
  • the delivery volume is designed so that it can completely fill the delivery gap when switching between the two delivery cylinders 22 ', 22 ′.
  • the control of the auxiliary cylinder 84 is carried out by the central control for the feed cylinder 22 ', 22 ⁇ .
  • one of the delivery cylinders 22 ', 22' material can be branched off from the delivery line 40 during the delivery stroke.
  • the piston 86 of the auxiliary cylinder 84 is either pushed back directly via the material pressure in the delivery line 40 or positively controlled.
  • the filling process can be extended over a longer period up to the entire duration of the delivery stroke, so that the disturbance caused thereby is negligible.
  • the start of the delivery stroke of the auxiliary cylinder 84 can be selected so that the interruption in the flow of flow is compensated for. Because of the inertia of the system, this means that the delivery stroke starts already during the closing of the shut-off element 32.
  • care must be taken to ensure that all of the material is expelled from the auxiliary cylinder.
  • FIG. 6 shows the mass flow ⁇ in the delivery line 40 behind the auxiliary cylinder 84 as a function of the time t.
  • the mass flows generated by the two feed cylinders 22 ', 22' result from the curve sections 1 and 2.
  • a delivery gap occurs which is filled by the mass delivery from the auxiliary cylinder 84, as indicated by the curve part 3.
  • a partial flow from the mass flow for filling the auxiliary cylinder branched off.
  • the discontinuities in the material flow resulting from the delivery gap can be completely compensated for by appropriate design and control of the auxiliary cylinder.
EP88114734A 1987-11-12 1988-09-09 Pompe pour matière épaisse Expired - Lifetime EP0315750B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873738359 DE3738359A1 (de) 1987-11-12 1987-11-12 Dickstoff-pumpe
DE3738359 1987-11-12

Publications (2)

Publication Number Publication Date
EP0315750A1 true EP0315750A1 (fr) 1989-05-17
EP0315750B1 EP0315750B1 (fr) 1991-07-10

Family

ID=6340300

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88114734A Expired - Lifetime EP0315750B1 (fr) 1987-11-12 1988-09-09 Pompe pour matière épaisse

Country Status (3)

Country Link
EP (1) EP0315750B1 (fr)
DE (2) DE3738359A1 (fr)
ES (1) ES2024604B3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0561262A1 (fr) * 1992-03-19 1993-09-22 Schwing GmbH Pompe pour matière épaisse ayant des cylindres, en particulier pompe à béton à deux cylindres
WO2001040649A1 (fr) * 1999-11-29 2001-06-07 Hudelmaier, Jörg Pompe a liquides epais
WO2007147586A1 (fr) * 2006-06-20 2007-12-27 Schwing Gmbh Pompe pour matières épaisses à deux cylindres présentant deux tubes de distribution
CN108825819A (zh) * 2018-05-04 2018-11-16 信易电热机械有限公司 一种自动分配器

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55140892A (en) * 1979-04-19 1980-11-04 Nippon Musical Instruments Mfg Musical tone controller for electronic musical instrument
US5422323A (en) * 1994-04-15 1995-06-06 Magneco/Metrel, Inc. Nonhazardous pumpable refractory insulating composition
DE102005008938B4 (de) * 2005-02-26 2007-01-25 Schwing, Friedrich, Dipl.-Ing. Pumpvorrichtung und Verfahren zur kontinuierlichen Förderung breiiger Massen
DE102010046649A1 (de) 2010-09-27 2012-03-29 Schwing Gmbh Dickstoffpumpe und Verfahren zur kontinuierlichen Förderung von Dickstoff
DE102018132309A1 (de) * 2018-12-14 2020-06-18 Schwing Gmbh Kolbenpumpe und Verfahren zum Betrieb einer Kolbenpumpe
DE102018132270A1 (de) * 2018-12-14 2020-06-18 Schwing Gmbh Kolbenpumpe und Verfahren zum Betrieb einer Kolbenpumpe
US11891987B2 (en) 2018-12-14 2024-02-06 Schwing Gmbh Piston pump and method for operating a piston pump

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448104A (en) * 1945-12-06 1948-08-31 Chain Belt Co Differential concrete pump
DE2729159A1 (de) * 1977-06-28 1979-01-11 Rotacrete Ltd Kolbenpumpe
EP0016410A1 (fr) * 1979-03-14 1980-10-01 Friedrich Wilh. Schwing GmbH Pompe pour matières visqueuses, notamment pompe à béton
EP0197402A2 (fr) * 1985-04-11 1986-10-15 PREUSSAG Aktiengesellschaft Metall Dispositif pour transporter une suspension de liquide épais et procédé opérationnel

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663129A (en) * 1970-09-18 1972-05-16 Leon A Antosh Concrete pump
US3963385A (en) * 1975-05-05 1976-06-15 Caban Angel M Valve assembly for concrete pumps

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448104A (en) * 1945-12-06 1948-08-31 Chain Belt Co Differential concrete pump
DE2729159A1 (de) * 1977-06-28 1979-01-11 Rotacrete Ltd Kolbenpumpe
EP0016410A1 (fr) * 1979-03-14 1980-10-01 Friedrich Wilh. Schwing GmbH Pompe pour matières visqueuses, notamment pompe à béton
EP0197402A2 (fr) * 1985-04-11 1986-10-15 PREUSSAG Aktiengesellschaft Metall Dispositif pour transporter une suspension de liquide épais et procédé opérationnel

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0561262A1 (fr) * 1992-03-19 1993-09-22 Schwing GmbH Pompe pour matière épaisse ayant des cylindres, en particulier pompe à béton à deux cylindres
US5316453A (en) * 1992-03-19 1994-05-31 Friedrich Wilh. Schwing Gmbh Slurry pump with discharge cylinders, especially two-cylinder concrete pump
WO2001040649A1 (fr) * 1999-11-29 2001-06-07 Hudelmaier, Jörg Pompe a liquides epais
US6793467B2 (en) 1999-11-29 2004-09-21 Jorg Hudelmaier Thick matter pump
CN1298996C (zh) * 1999-11-29 2007-02-07 约尔格·于代尔梅尔 厚料泵及其泵送／抽吸方法
WO2007147586A1 (fr) * 2006-06-20 2007-12-27 Schwing Gmbh Pompe pour matières épaisses à deux cylindres présentant deux tubes de distribution
CN108825819A (zh) * 2018-05-04 2018-11-16 信易电热机械有限公司 一种自动分配器

Also Published As

Publication number Publication date
ES2024604B3 (es) 1992-03-01
DE3863624D1 (de) 1991-08-14
DE3738359A1 (de) 1989-05-24
EP0315750B1 (fr) 1991-07-10

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