EP0389785B1 - Zweizylinder-Dickstoffpumpe mit Kolbenspeicher - Google Patents

Zweizylinder-Dickstoffpumpe mit Kolbenspeicher Download PDF

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Publication number
EP0389785B1
EP0389785B1 EP90103245A EP90103245A EP0389785B1 EP 0389785 B1 EP0389785 B1 EP 0389785B1 EP 90103245 A EP90103245 A EP 90103245A EP 90103245 A EP90103245 A EP 90103245A EP 0389785 B1 EP0389785 B1 EP 0389785B1
Authority
EP
European Patent Office
Prior art keywords
accumulator
piston
cylinder
delivery
drive piston
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
EP90103245A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0389785A3 (de
EP0389785A2 (de
Inventor
Friedrich Dipl.-Ing. Schwing
Wolfgang Merten
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.)
Friedrich Wilhelm Schwing GmbH
Original Assignee
Friedrich Wilhelm 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 Friedrich Wilhelm Schwing GmbH filed Critical Friedrich Wilhelm Schwing GmbH
Publication of EP0389785A2 publication Critical patent/EP0389785A2/de
Publication of EP0389785A3 publication Critical patent/EP0389785A3/de
Application granted granted Critical
Publication of EP0389785B1 publication Critical patent/EP0389785B1/de
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
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/103—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber
    • F04B9/105—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting liquid motor

Definitions

  • the invention relates to a two-cylinder thick matter pump with a piston accumulator according to the preamble of patent claim 1.
  • the two-cylinder thick matter pump compensates for pressure and volume fluctuations in the delivery line which arise between the delivery strokes of the interacting delivery cylinders.
  • These fluctuations disturbing the degree of uniformity of the delivery are larger for mechanically controlled delivery cylinders, e.g. delivery cylinders whose pistons are driven by a crankshaft, than for hydraulically driven delivery pistons, which allow the piston strokes to be covered, but also pressure and volume fluctuations in the delivery line cannot prevent it if the piston of the conveying cylinder is switched to the suction stroke and the piston of the delivery cylinder sucking from the priming tank of the pump is switched to the pressure stroke.
  • the piston accumulator presses nitrogen into the delivery line and thereby at least partially compensates for the pressure and volume loss in the switchover phase.
  • the two-cylinder thick matter pumps according to the invention differ from piston pumps which try to improve the degree of uniformity of the thick matter conveyance with at least three or even more delivery cylinders, because in such pump constructions thick matter has to be sucked out of the prefilling container with the second or the additional delivery cylinders, whereas with piston accumulators the additional delivery volume from the delivery line into the storage and from this back into the delivery line reaches during the switching phase of the delivery cylinder.
  • Thick matter pumps with more than two delivery cylinders to compensate for volume and pressure fluctuations in the interest of increasing the degree of uniformity in the delivery line can alleviate the pressure fluctuations at the expense of a simple mechanical construction and simple control in favor of a considerable additional technical effort, but they can avoid degrees of non-uniformity in the delivery Not.
  • the invention relates in particular to thick matter pumps which convey sludge.
  • Thick liquid coal sludges are suitable for loading furnaces with fossil fuels, sewage sludge, mortar and plastering compounds or the like, but above all media which, in the resting phase of their conveyance, become solid and thus bake on the The walls of the conveying paths are inclined, which temporarily do not carry a flow.
  • This includes, above all, hydraulically setting media and sludges with pozzolana-like properties.
  • conveyance with a high degree of uniformity is often important because pressure and volume fluctuations in downstream devices, for example in burners of furnaces, cause difficulties or lead to considerable dynamic stresses, which is particularly the case with large delivery heights.
  • Piston accumulators generally use a cylinder, which is built on the delivery line, into which it opens with one side, while its other end is closed by a movable piston.
  • Such piston accumulators differ from bladder accumulators by their pistons and from wind boilers by the closing of the medium in the accumulator with a fixed but movable wall. Piston accumulators allow practically any delivery pressure and can therefore be used together with pumps that reach a dangerous delivery head.
  • the invention is based on a known thick matter pump, which works with a piston accumulator.
  • the storage piston works with its side facing away from the pumped medium on a pressure cushion made of a high-tension gas.
  • the storage cylinder fills with the delivery medium from the delivery line, the storage piston compressing the gas cushion.
  • the high-tension gas cushion presses the piston in the opposite direction and presses the medium from the storage cylinder into the delivery line.
  • a generic two-cylinder slurry pump is known for example from GB-A-2 119 865.
  • the pump has a storage piston which is driven by a piston of a hydraulically actuated working cylinder coupled to it for pumping into the delivery line during the changeover phase in which the delivery of the regular pump cylinders is interrupted.
  • the front end position of the storage piston is dependent on the one hand on the pressure in the delivery line and on the other hand on the predetermined pressure with which the working cylinder is constantly acted upon in the direction of the delivery line.
  • a line to the delivery line is provided in connection to the storage cylinder, in which the medium can bake.
  • Another thick material pump of the same type is known from DE-A-2 611 944. Even with this thick matter pump, complete emptying of the storage cylinder is not guaranteed. On the contrary, an auxiliary line is provided in this pump between the valve and the storage cylinder, in which there is a dead space for the medium. In this dead space, concrete can easily deposit and cake.
  • a concrete pump is known from "Patent Abstracts of Japan, Kokai No. 55-87867", which is provided with a pressure reducing device.
  • the pressure reducing device has a piston which can be acted upon hydraulically on both sides and which serves to suck in thick matter in the changeover phase, so that the pressure in the delivery line drops and the changeover valves can thus be brought into position more easily.
  • the object of the invention is to achieve an improvement in the degree of uniformity of the conveyance in a two-cylinder thick matter pump of the general construction described at the outset, which works perfectly even with a conveying medium which tends to harden or bake prematurely on parts of the conveying line.
  • the accumulator piston is driven by a hydraulic working cylinder, there is no gas cushion which loads the accumulator piston in favor of the directly connected accumulator drive piston, the positive control of which with the delivery cylinders of the thick matter pump ensures that the accumulator piston in the pumping phase for filling the accumulator in Storage cylinder is returned and in the switching phase presses the storage filling in the delivery line in the opposite direction.
  • the end positions of the accumulator drive piston are determined hydraulically and therefore also determine the end positions of the accumulator piston, of which the extreme external position of the accumulator piston in the accumulator cylinder is selected such that the accumulator is completely emptied. Since these end positions are forced in each switching phase, the pumped medium contained in the memory cannot Freeze and block the memory.
  • the hydraulic medium required for the energy supply to the storage drive cylinder can come from the pressure generator of the thick matter pump, the delivery cylinder of which is directly driven by hydraulic working cylinders. This results in a significant simplification of the storage operation, which does not require an external compressed gas source.
  • the positive control of the accumulator drive piston also eliminates the irregularities in the position of the accumulator piston, which occur in particular when the stroke times of the delivery cylinders are variable, which is the case with many thick matter pumps for regulating the delivery quantities.
  • the patent claim 2 proposes an embodiment of the invention, which ensures a short-term emptying of the storage cylinder adapted to the duration of the switching phase by hydraulic means and also allows the storage cylinder to be filled in the pumping phase following the switching phase in such a way that by the in the storage cylinder penetrating medium does not result in a pressure drop in the delivery line, which is achieved by expanding the storage capacity up to a maximum time, which can correspond to the pumping phase, but can be selected in individual cases. In this way, an almost complete uniformity of the flow is achieved.
  • the storage tank is briefly emptied with the aid of the high tension hydraulic working medium of the storage drive, while the longer duration of the storage filling takes place by regulating the current in the storage drive piston annulus, in which the hydraulic pressure acts in the same direction as the pressure of the delivery medium on the storage piston and returns the storage drive piston.
  • the storage piston return time can be regulated.
  • the embodiment of the invention according to claim 4 allows control of the hydraulic pressure on the piston side in the storage drive cylinder and thus a determination of the emptying time of the storage cylinder.
  • the hydraulic accumulator provided for this purpose also makes it possible to compensate for shortfalls in the hydraulic working medium for the accumulator drive.
  • the above-described regulation of the filling time of the storage cylinder is made possible hydraulically in a simple manner with the features of claim 5.
  • the setting is carried out by hand, which offers the advantage of being able to be adapted at any time to the conditions of a specific application of the thick matter pump, in particular also to changing conditions that can be created by the respective pumped medium.
  • the claim 6, offers the advantage of automatically filling the flow valve to fill the memory to adapt to changing emptying times of the delivery cylinders, which are particularly given when the thick matter pump is set to different delivery rates.
  • Switching signals are at (2) which represent the end positions of the pistons in the feed cylinders or in hydraulic drive cylinders of the thick matter pump.
  • the feed cylinders of the thick matter pump work alternately on a feed line (3), one of the feed cylinders sucking the thick matter out of a prefill container of the pump, while the other feed cylinder presses its previously sucked filling into the feed line (3).
  • a storage cylinder (4) at (5) is flanged.
  • the opposite end of the storage cylinder (4) is flanged to a working cylinder (7), the working piston (8) of which drives a storage piston (10) attached to its piston rod (9), which seals the storage cylinder (4) against the flange (6).
  • Two seat valves (12) and (14) control the hydraulic accumulator drive cylinder (7) and are indicated in the dash-dotted line at (11).
  • the seat valves (12) and (14) are pilot operated via a 4/2 way valve.
  • the piston chamber (11 ') of the storage drive cylinder which is closed off from the full piston surface (7) is bypassing the 4/2 way valve (15) with a line (16) directly connected to a hydraulic accumulator (17).
  • the 2/2 way valve is acted on from line (16) via a branch (18).
  • the line (19) to the hydraulic accumulator (17) opens into the line (16) in front of the directional control valve (15). In front of the line (19) is the connection (20) to the line coming from the pressure generator.
  • the 2/2 way valve is switched using a hydraulic control line (22).
  • the reversal takes place against the pressure from a line (24) which is relieved to the tank via a throttle (23).
  • the 4/2 way valve is changed over line (22) so that hydraulic line passes through the line (18) to the poppet valve (12) in order to connect the pressure oil to that of the annular surface of the accumulator drive piston (8) closed piston ring space (11 ') of the storage drive cylinder (7) to lock.
  • the seat valve (14) is relieved on its rear side via the lines (30, 31) to the tank, as a result of which it clears the way via the line (27) to the tank (28).
  • the end position of the storage drive piston (8) in the cylinder (7) is controlled via a switching valve (32) in the storage drive cylinder (7), which is hydraulically controlled by the piston (8).
  • the switching point is selected so that the entire volume of the storage cylinder (4) is pressed into the delivery line (3).
  • the piston ring side of the storage drive cylinder (7) is depressurized via line (24). This makes it possible to transfer the storage contents into the delivery line (3) while overcoming the delivery line pressure.
  • the accumulator drive piston (8) is moved in the opposite direction and presses hydraulic working fluid via line (16) bypassing the 4/2 way valve (15) into the hydraulic accumulator (17), which is acted upon by the hydraulic pressure generator (1).
  • the storage cylinder (4) can be filled with medium from the pressure line (3) for compensation in the subsequent switchover phase.
  • the flow control valve (25) sets the return time of the storage piston (10) so that it corresponds to the duration of the delivery stroke of the thick matter pump in order to prevent a change in the delivery rate due to the filling of the accumulator.
  • the return time of the working piston (8) for filling the accumulator (4) can be adjusted manually by adjusting the flow control valve (25).
  • the reversal can also be carried out electrically using limit switches.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Refuse Collection And Transfer (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Display Devices Of Pinball Game Machines (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Dram (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
EP90103245A 1989-03-29 1990-02-20 Zweizylinder-Dickstoffpumpe mit Kolbenspeicher Expired - Lifetime EP0389785B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3910189 1989-03-29
DE3910189A DE3910189A1 (de) 1989-03-29 1989-03-29 Zweizylinder-dickstoffpumpe mit kolbenspeicher

Publications (3)

Publication Number Publication Date
EP0389785A2 EP0389785A2 (de) 1990-10-03
EP0389785A3 EP0389785A3 (de) 1991-01-16
EP0389785B1 true EP0389785B1 (de) 1994-09-14

Family

ID=6377396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103245A Expired - Lifetime EP0389785B1 (de) 1989-03-29 1990-02-20 Zweizylinder-Dickstoffpumpe mit Kolbenspeicher

Country Status (12)

Country Link
EP (1) EP0389785B1 (ru)
JP (1) JPH02283872A (ru)
KR (1) KR900014753A (ru)
AT (1) ATE111564T1 (ru)
AU (1) AU633550B2 (ru)
CA (1) CA2013356A1 (ru)
DD (1) DD296992A5 (ru)
DE (2) DE3910189A1 (ru)
ES (1) ES2063180T3 (ru)
FI (1) FI901568A0 (ru)
RU (1) RU2045686C1 (ru)
ZA (1) ZA902341B (ru)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1948933A2 (en) * 2005-11-04 2008-07-30 University Of Southern California Material delivery system using decoupling accumulator
US8308470B2 (en) 2005-11-04 2012-11-13 University Of Southern California Extrusion of cementitious material with different curing rates
US8992679B2 (en) 2003-01-21 2015-03-31 University Of Southern California Cementitious material, dry construction pellets comprising uncured cement powder and binder, and method of making thereof

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04134673U (ja) * 1991-06-07 1992-12-15 株式会社フジタ コンクリート圧送圧変動防止装置
DE4224162A1 (de) * 1992-07-22 1994-01-27 Korthaus Ernst Betonverteilersystem
DE4336087A1 (de) * 1993-10-22 1995-04-27 Korthaus Ernst Dickstoffspeicher
CN102094779B (zh) * 2010-12-28 2012-01-04 长沙中联重工科技发展股份有限公司 混凝土泵及调节该泵中对摆动执行器的驱动压力值的方法
US10648462B2 (en) * 2013-10-29 2020-05-12 Thermtech Holdings As System for feeding and pumping of less pumpable material in a conduit line
DE102014212021A1 (de) 2014-06-23 2015-12-24 Putzmeister Solid Pumps Gmbh Vorrichtung und Verfahren zum Dämpfen von Druckschwankungen in der Förderleitung einer Dickstoffpumpe
CN110821775B (zh) * 2019-09-27 2021-10-15 日昌升建筑新材料设计研究院有限公司 一种多缸并联式矿山尾矿浆液压泵送系统

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT234514B (de) * 1961-08-17 1964-07-10 Martin Sebastiani Dickstoff- bzw. Mörtelpumpe
DE2052583A1 (de) * 1970-10-27 1972-05-04 Bors, Heinz J., Campione (Schweiz) Vorrichtung zum Fördern dickflüssiger Stoffe, insbesondere Beton, Mörtel und dgl
US3963385A (en) * 1975-05-05 1976-06-15 Caban Angel M Valve assembly for concrete pumps
GB2119865A (en) * 1982-03-27 1983-11-23 John Harbridge Piston pump or transformer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, unexamined applications, Sektion M, Band 4, Nr. 132, September 17, 1980, The Patent Office Japanese Government, Seite 45 M 32, Kokai-Nr. 55-87867 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8992679B2 (en) 2003-01-21 2015-03-31 University Of Southern California Cementitious material, dry construction pellets comprising uncured cement powder and binder, and method of making thereof
EP1948933A2 (en) * 2005-11-04 2008-07-30 University Of Southern California Material delivery system using decoupling accumulator
EP1948933A4 (en) * 2005-11-04 2012-01-18 Univ Southern California MATERIAL FEEDING SYSTEM IMPLEMENTING A DECOUPLING ACCUMULATOR
US8308470B2 (en) 2005-11-04 2012-11-13 University Of Southern California Extrusion of cementitious material with different curing rates

Also Published As

Publication number Publication date
DE59007097D1 (de) 1994-10-20
DE3910189A1 (de) 1990-10-04
AU633550B2 (en) 1993-02-04
KR900014753A (ko) 1990-10-24
FI901568A0 (fi) 1990-03-29
CA2013356A1 (en) 1990-09-29
EP0389785A3 (de) 1991-01-16
ZA902341B (en) 1990-12-28
ATE111564T1 (de) 1994-09-15
EP0389785A2 (de) 1990-10-03
RU2045686C1 (ru) 1995-10-10
AU5232990A (en) 1990-10-04
JPH02283872A (ja) 1990-11-21
ES2063180T3 (es) 1995-01-01
DD296992A5 (de) 1991-12-19

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