EP3613983A1 - Pompe à piston pour matières épaisses pourvue de boîte à eau - Google Patents

Pompe à piston pour matières épaisses pourvue de boîte à eau Download PDF

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Publication number
EP3613983A1
EP3613983A1 EP19192650.0A EP19192650A EP3613983A1 EP 3613983 A1 EP3613983 A1 EP 3613983A1 EP 19192650 A EP19192650 A EP 19192650A EP 3613983 A1 EP3613983 A1 EP 3613983A1
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EP
European Patent Office
Prior art keywords
water tank
liquid
sensor
sensor device
piston pump
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
EP19192650.0A
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German (de)
English (en)
Other versions
EP3613983B1 (fr
Inventor
Jörg-Peter KARRIE
Artem BESPALOV
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
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Friedrich Wilhelm Schwing GmbH
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Application filed by Friedrich Wilhelm Schwing GmbH filed Critical Friedrich Wilhelm Schwing GmbH
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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
    • 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

Definitions

  • the invention relates to a piston pump for thick matter, with at least one feed cylinder, a feed piston which is axially movable in the feed cylinder and which is connected to a drive via a piston rod, and at least one water tank connected to the feed cylinder and penetrated by the piston rod between the feed cylinder and the Drive is arranged, and a method for determining and monitoring the piston wear in such a piston pump.
  • Such piston pumps are out DE 10 2005 039 238 B4 and also from DE 10 2007 050 279 B3 known.
  • Piston pumps for pumping thick materials, such as concrete have long been used on construction sites. As a rule, they are designed as hydraulically operated piston pumps, usually two-cylinder, with the concrete being conveyed through hoses or pipes.
  • the delivery pistons are in direct contact with the concrete to be delivered.
  • the pistons especially the piston seals, have to withstand high stresses in concrete pumps and are subject to wear.
  • water lubrication of the delivery cylinders behind the pistons is known in concrete pumps.
  • a water box which is penetrated by the piston rods and is connected to the two delivery cylinders, is arranged between the delivery cylinders and their hydraulic drive cylinders.
  • the pump When the pump is operating, the water in the water tank oscillates between the two delivery cylinders. The water rinses the delivery pistons on the back. The water lubricates the delivery pistons and cools the delivery cylinders.
  • the water flushing that takes place above the water tank has the additional function of loosening and rinsing off the concrete that may have been conveyed through if the sealing lips are damaged.
  • the concrete that has passed due to the inevitable leakage of the delivery pistons can settle in the water tank and is removed from it regularly, for example when changing water.
  • the operator of the machine uses the turbidity of the water to determine whether the delivery pistons are still tight or need to be replaced soon. If, for example, the delivery piston wears out heavily during a longer pumping activity without pauses or water changes, this damage may initially go unnoticed. In extreme cases, this can lead to pump failure, because if the pumping process is interrupted when the concrete can no longer be pressed out of the delivery line due to leaking delivery pistons, the concrete in the delivery line hardens, so that it has to be replaced.
  • At least one sensor device is provided for detecting a change in the composition of the liquid in the water tank, the wear on the delivery pistons or delivery cylinders, in particular on the seals arranged between them, of the piston pump can be easily and early detected, so that preventive maintenance measures can be initiated in good time can.
  • a sensor device that is suitable for detecting a change in the composition of the liquid in the water tank, it can be easily determined whether thick material conveyed by the piston pump has entered the water tank. From this, there are indications of wear derive the delivery piston or the delivery cylinder of the piston pump and the seal arranged between the delivery cylinder and the delivery piston.
  • the water in the water box is only slightly contaminated by the pumped thick matter through the pumping process when the delivery pistons are intact.
  • the liquid contaminated by this should therefore be drained and replaced regularly, for example at the end of a working day. If there is an increased change in the composition, this is detected by the sensor device, as a result of which a measured value that is easy to detect and is directly dependent on wear is given.
  • the pistons and cylinders of the piston pump can be replaced in a maintenance measure in good time before the piston pump fails due to wear.
  • the sensor device is designed to determine the proportion of the thick matter that has entered the water tank from the feed cylinder on the basis of the composition of the liquid in the water tank.
  • the proportion of the thick material from the feed cylinder into the water tank is a good indicator of the wear of the feed piston or the feed cylinder, since the composition of the liquid in the water tank is changed by the thick material that has entered the water tank due to wear. This enables permanent monitoring of wear on the delivery piston and delivery cylinder.
  • An embodiment is particularly preferred which provides that the proportion of the thick matter that has entered the water tank is determined on the basis of an indicator substance, which the thick matter before entering the feed cylinder by means of an indicator substance Mixing device of the piston pump is buried. If the proportion of the thick matter in the water tank cannot be determined directly, since contamination of the water in the water tank by the medium or the thick matter does not lead to a (practicable) measurable change in the liquid, the medium can be exposed to a substance, e.g. table salt, by means of a Mixing device can be added in order to achieve the desired measurable change in the water through the medium when the delivery piston leaks. Even a small addition of table salt is a sufficient indicator that gives indications of the wear that is present.
  • the indicator substance added is preferably inert, that is to say it does not change or influence the chemical or physical properties of the thick matter or the conveying medium, if possible.
  • a particularly advantageous embodiment of the invention relates to the fact that it is designed as a two-cylinder piston pump with two push-pull and separately driven feed cylinders, the two feed cylinders being connected to one another via the water tank.
  • the piston pump can advantageously be designed as a tandem pump, the water oscillating between the delivery cylinders during operation of the piston pump and thus ensuring the lubrication and flushing of the piston guide surface.
  • two hydraulic drive cylinders connected to the piston rods are expediently used to drive the piston pump, which are designed as double-acting differential cylinders and, in push-pull mode, drive the pistons for alternating execution of filling and delivery strokes.
  • a particularly advantageous embodiment of the invention provides that the sensor device or a sensor encompassed by the sensor device is attached to a location on the water tank which is washed by the liquid which is moved through the water tank by the counter-clockwise delivery cylinders. At a location of the water tank that is washed around in this way, the sensor device or a sensor encompassed by the sensor device can be kept free of deposits of the thick matter located in the water tank, so that a change in composition in the Liquid in the water tank can be reliably detected.
  • the piston pump is usually installed with an incline in the vehicle frame.
  • the sensor device or a sensor included in the sensor device must be installed at a point where the sludge does not collect, for example close to the drives.
  • the sensor or the sensor device should not be in the way during maintenance work in the water tank, for example when replacing the delivery pistons.
  • An advantageous embodiment of the invention provides that the sensor device or a sensor included in the sensor device is attached to a cover of the water tank. Attaching the sensor device or a sensor comprised by the sensor device to the lid of the water tank has the advantage that the sensor device or the sensor can be retrofitted by replacing a conventional lid with a lid with sensor device or sensor.
  • the sensor device or the sensor can, for example, also be screwed into the cover from the outside through a threaded opening, so that the sensor device or the sensor can be removed before the cover is removed.
  • the sensor device comprises a sensor for determining the pH value of the liquid in the water tank, the sensor device detecting the change in composition of the liquid in the water tank on the basis of the pH value of the liquid determined by the sensor. If there is a change in the pH value of the liquid due to the contamination of the water in the water tank with the thick matter, this can easily be detected using a sensor which is designed to determine the pH value.
  • Fresh concrete is strongly alkaline, which is why the pH measurement is a suitable indicator of the disproportionate penetration of the thick material via the delivery pistons or delivery cylinders that are leaking due to wear and tear early on.
  • the sensor device comprises a sensor for determining the redox voltage of the liquid in the water tank, the sensor device detecting the change in composition of the liquid in the water box on the basis of the redox voltage of the liquid determined by the sensor. If there is a change in the redox potential of the liquid due to the contamination of the water in the water tank with the thick matter, this can be easily detected using a sensor which is designed to determine the redox voltage.
  • the redox voltage of the liquid is a suitable indicator for early detection of the disproportionate penetration of the thick matter through the delivery pistons or delivery cylinders which are leaky due to wear.
  • the sensor device comprises a sensor for determining the turbidity of the liquid in the water tank, the sensor device detecting the change in composition of the liquid in the water tank on the basis of the turbidity of the liquid determined by the sensor. If the liquid contaminates the water in the water tank with the thick matter, this can be easily detected using a sensor which is designed to determine the turbidity. The turbidity of the liquid can then be a suitable indicator for early detection of the disproportionate penetration of a turbid thick material due to the wear of the delivery pistons or delivery cylinders.
  • the sensor device comprises a sensor for determining the conductivity of the liquid in the water tank, the sensor device detecting the change in composition of the liquid in the water tank on the basis of the conductivity of the liquid determined by the sensor.
  • the chemical constituents of the thick matter especially the hydroxides contained in fresh concrete, have a significant effect on leaky delivery pistons Change in the conductivity of the liquid in the water tank.
  • the change in conductivity related to the contamination of the water with thick matter is linear over a large range, so that the conductivity is a very good indicator of a leaking delivery piston.
  • the conductivity of the liquid in the water tank thus represents a suitable indicator for early detection of the disproportionate penetration of this thick matter via the delivery pistons or delivery cylinders which are leaky due to wear. Sensors for measuring the conductivity are very robust against environmental influences.
  • a particularly advantageous embodiment of the invention provides that the sensor for determining the conductivity works inductively or conductively.
  • conductivity sensors a distinction must be made between conductive and inductive sensors.
  • Inductive sensors which work with an excitation and a receiver coil, each housed in a plastic housing, are particularly resistant to environmental influences and almost maintenance-free. Deposits and grease or oil on the sensor surface have practically no influence on the measuring accuracy.
  • the inductive conductivity sensor preferably consists of a hermetically sealed body made of polypropylene (PP) or polyvinylidene fluoride (PVDF), in the interior of which the two measuring coils are arranged.
  • PP polypropylene
  • PVDF polyvinylidene fluoride
  • conductive sensors represent the simplest design of a conductivity sensor.
  • the sensor consists of two electrodes and a shaft that fixes the two electrodes. A constant voltage is present between the electrodes. The current flowing through the liquid in the water tank provides the measurement signal. Furthermore, conductive four-electrode sensors are particularly suitable. Such a sensor contains two pairs of electrodes, one of which impresses a measuring current that flows over the liquid in the water tank, the other pair measures the voltage drop across the measuring section in the water tank. It is particularly advantageous that conductive sensors are insensitive to interfering resistances that are caused, for example, by long connecting lines, by dirt or by polarization.
  • the most suitable sensor system For other media to be pumped, especially in the area of industrial piston pumps, which are used in sewage treatment plants, in the waste industry, in the chemical industry, food industry, etc., the most suitable sensor system must be determined. When selecting the sensor system, a sensor that is particularly robust against the conditions in the water tank is preferable.
  • the wear on the delivery pistons or delivery cylinders, in particular on the seals arranged in between can be derived and detected early, so that preventive maintenance measures can be initiated in good time can.
  • the evaluation of the detected change in composition includes a qualitative and / or quantitative determination of the passage of thick matter from the at least one delivery cylinder into the water tank.
  • the wear can be evaluated via the change in composition, so that conclusions about the wear can be made at an early stage and necessary maintenance measures can be initiated.
  • An advantageous embodiment of the method provides that an indicator substance is added to the thick matter, which is detected to determine the transition.
  • the excess thick matter in the liquid in the water tank can also be determined if the contamination of the water in the water tank by the conveying medium or the thick matter does not lead to any measurable change in the liquid.
  • a piston wear warning is generated when a threshold value for the derived wear is reached.
  • a threshold value can be selected which triggers an automatic piston wear warning which enables preventive maintenance measures before the piston pump fails. If the water in the water tank is not exchanged for a longer period of time when using the piston pump, this can result in the measurement signal exceeding a threshold value, even though the delivery pistons are still intact because the pumping process also causes some contamination of the water with new pistons. For this reason, it is advantageous to take a temporal component into account. Only a disproportionately quick change in composition can indicate a worn delivery piston. As an alternative to the time, the number of pump strokes or the amount of thick matter pumped or the pump pressure can also be taken into account.
  • FIG. 1 A truck-mounted concrete pump is shown at 102.
  • the truck-mounted concrete pump 102 shown has a large manipulator with a foldable articulated mast 103, which comprises a turntable 105 rotatable about a vertical axis 104 and a plurality of mast segments 106.
  • the mast segments 106 are pivotally connected to the adjacent mast segment 106 or the turntable 105 via articulated joints 107.
  • the articulated mast 103 preferably has drive units in the form of hydraulic cylinders.
  • the turntable 105 of the articulated mast 103 is rotatably connected to the chassis 108 of the truck-mounted concrete pump 102.
  • the tilting moment generated by the unfolding and the movement of the articulated mast 103 is supported by the chassis 108 on a standing area on the ground 110 which is enlarged by means of support arms 109.
  • the chassis 108 has a plurality of support arms 109 which, from a driving position in which the support arms 109 do not protrude beyond the external dimensions of the chassis, can be fully or partially folded out or extended into a support position.
  • a piston pump 1 according to the invention serving as a concrete pump is arranged in the rear area of the truck-mounted concrete pump designed as a vehicle. Using this piston pump 1, which has already been described above and below, concrete can be conveyed along the unfolded articulated mast 103 through conveyor lines (not shown) and distributed at the mast end by means of mast movements of the articulated mast 103.
  • Reference number 1 denotes a piston pump according to the invention Figure 1 shown in a top view.
  • the piston pump 1 is designed as a tandem pump. This means that the delivery cylinders 2, 3 arranged side by side work in push-pull.
  • the two delivery cylinders 2, 3 via separate drives 8, 9 are used alternately driven by filling and conveying strokes.
  • the drives 8, 9 are preferably designed as hydraulic cylinders.
  • Axially movable delivery pistons 4, 5 are arranged in the delivery cylinders 2, 3 and are each connected to the associated drives 8, 9 via piston rods 6, 7. It can also be seen that the two delivery cylinders 2, 3 are connected to one another via a water tank 10.
  • This water box 10 is penetrated by the piston rods 6, 7 and is arranged between the feed cylinders 2, 3 and the drives 8, 9.
  • a thick material feed container 13 from which the thick material 100 is taken into the pump chambers of the delivery cylinders 2, 3 and is conveyed from these into a single delivery line 14.
  • the delivery line 14 is connected via a pipe switch 15 to the pump chambers of the delivery cylinders 2, 3, the pipe switch 15 alternately connecting the delivery line 14 to the two delivery cylinders 2, 3 in time with the delivery strokes.
  • a sensor device 11 for detecting a change in the composition of the liquid 101 located in the water tank 10.
  • This sensor device 11 is designed to determine the proportion of the thick material 100 that has entered the water tank 10 from the delivery cylinders 2, 3 based on the composition of the water tank 10 and to determine the delivery cylinders 2, 3, located on the piston rear, liquid 101.
  • the proportion of the thick material 100 that has entered the water tank 10 can also be determined on the basis of an indicator substance, which is preferably added to the thick material 100 before it enters the feed cylinders 2, 3 by means of an admixing device (not shown), which is assigned to the thick material feed hopper 13, for example and admixes the indicator substance with the thick substance 100 given here.
  • the sensor device 11 can comprise a sensor 11 for determining the pH value and / or the redox voltage and / or the turbidity and / or the conductivity of the liquid 101 in the water tank 10.
  • Figure 3 is the piston pump according to Figure 2 Shown in an embodiment, which provides for the arrangement of the sensor device 11 or a sensor 11 comprised by the sensor device at a location in the water tank 10 which is washed by the liquid 101 moving through the water tank 10 by the delivery cylinders 2, 3 working in push-pull mode.
  • the sensor device 11 or a Sensor 11 encompassed by the sensor device is kept substantially free of deposits of the thick material 100 present in the water tank 10, so that a change in the composition of the liquid 101 in the water box 10 can be reliably detected via the sensor device 11.
  • the piston pump 1, as in Figure 1 can be seen, mounted with an inclination in the vehicle frame 108.
  • mud 16 can be seen on the sloping bottom of the water tank 10. If sludge forms in the water tank 10, the sensor device 11 or a sensor 11 encompassed by the sensor device must be installed at the point shown, since the sludge 16 does not collect near the drives 8, 9 here. At this point, the sensor 11 or the sensor device 11 is not in the way even during maintenance work in the water tank 10, for example when replacing the delivery pistons 4, 5.
  • the senor 11 can protrude through an opening or bore into the water tank 10 or can also be mounted at a suitable position in the water tank 10, the sensor cable then being e.g. is led out of the water box 10 to an evaluation electronics via an opening in or on the cover 12.
  • This makes it possible, for example, to arrange the sensor 10 between the piston rods 6, 7 on the side of the delivery cylinders 2, 3. This is an area in which the water is particularly strongly moved by the piston movements.
  • FIG 4 is the piston pump 1 according to Figure 2 Shown in an embodiment, which provides for the arrangement of the sensor device 11 or a sensor 11 comprised by the sensor device on a cover 12 of the water tank 10.
  • the sensor device 11 or the sensor 11 shown here is attached to the cover 12 and projects into the liquid 101 in the water tank 10 from above. It should be noted here that the sensor device 11 dips deep enough into the liquid 101, even if the liquid level in the water tank 10 should be low.
  • the attachment of the sensor device 11 in the lid 12 of the water box 10 has the advantage that the sensor device 11 can be retrofitted by replacing a conventional lid with a lid 12 with the sensor device 11.
  • the Figure 5 shows a diagram of a series of measurements in which the conductivity of the liquid 101 in the water tank 10 was recorded conductively and the total proportion of cement dissolved in water was determined. This makes it very easy to draw conclusions about the proportion of the thick material 100 that has passed from the delivery cylinder 2, 3 into the water tank 10 on the basis of the conductivity of the liquid 101 in the water tank 10.
  • H2O in g Cement in g conductivity 100 0.20 487 100 0.40 806 100 0.60 1194 100 0.80 1360 100 1.00 1460 100 1.20 1687 100 1.40 1788 100 1.60 1979 100 1.80 2070 100 2.00 2190 100 2.20 2280 100 2.40 2380 100 2.60 2510 100 2.80 2560 100 3.00 2690

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP19192650.0A 2018-08-23 2019-08-20 Pompe à piston pour matières épaisses pourvue de boîte à eau Active EP3613983B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018120582.1A DE102018120582A1 (de) 2018-08-23 2018-08-23 Kolbenpumpe für Dickstoffe mit Wasserkasten

Publications (2)

Publication Number Publication Date
EP3613983A1 true EP3613983A1 (fr) 2020-02-26
EP3613983B1 EP3613983B1 (fr) 2022-10-05

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ID=67659527

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19192650.0A Active EP3613983B1 (fr) 2018-08-23 2019-08-20 Pompe à piston pour matières épaisses pourvue de boîte à eau

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EP (1) EP3613983B1 (fr)
DE (1) DE102018120582A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146721A (en) * 1960-08-08 1964-09-01 Schwing Friedrich Wilhelm Hydraulic piston pump for the pumping of viscous pulpy or plastic substances
DE3834678A1 (de) * 1988-10-12 1990-04-19 Putzmeister Maschf Verfahren und vorrichtung zur korrektur des kolbenhubs in den zylindern einer zweizylinder-dickstoffpumpe
DE102007050279B3 (de) 2007-10-18 2009-02-12 Schwing Gmbh Betonpumpe mit Kolbenschmierung
DE102008007069A1 (de) * 2008-01-31 2009-08-06 Putzmeister Concrete Pumps Gmbh Zylinder-/Kolbeneinheit mit in der Zylinderwandung angeordneter Muffe
DE102010019207A1 (de) * 2009-11-23 2012-01-19 Walter Werne Messkopf
DE102005039238B4 (de) 2005-08-19 2016-05-25 Schwing Gmbh Betonfördervorrichtung mit einem Wasserkasten

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE609281C (de) * 1932-12-24 1935-02-11 Willy Siebert Betonpumpe
DE1780902U (de) * 1958-10-08 1959-01-08 Friedrich Wilh Schwing Hydraulische kolbenpumpe zur foerderung breiiger oder plastischer massen.
DE1296002B (de) * 1962-02-14 1969-05-22 Gartner & Co J Foerdereinrichtung mit Kolbenpumpe zum Foerdern von dickfluessigen Massen, insbesondere Beton
JPH0673651B2 (ja) 1986-10-31 1994-09-21 トリニテイ工業株式会社 塗布剤供給装置
DE8705353U1 (de) 1987-04-10 1987-06-19 Wirth Maschinen- und Bohrgeräte-Fabrik GmbH, 5140 Erkelenz Vorrichtung für Kolbenpumpen, insbesondere für den Feststofftransport
US5332366A (en) * 1993-01-22 1994-07-26 Schwing America, Inc. Concrete pump monitoring system
IT1282148B1 (it) * 1996-04-30 1998-03-12 Cifa Spa Impianto per la erogazione di calcestruzzo additivat0, a flusso costante
US5883299A (en) 1996-06-28 1999-03-16 Texaco Inc System for monitoring diaphragm pump failure
DE102004013142A1 (de) * 2004-03-17 2005-10-06 Sonplas Gmbh Pumpvorrichtung für ein Fluid
DE102017112110A1 (de) * 2017-06-01 2018-12-06 Hammelmann GmbH Plungerpumpe sowie Verwendung einer Plungerpumpe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146721A (en) * 1960-08-08 1964-09-01 Schwing Friedrich Wilhelm Hydraulic piston pump for the pumping of viscous pulpy or plastic substances
DE3834678A1 (de) * 1988-10-12 1990-04-19 Putzmeister Maschf Verfahren und vorrichtung zur korrektur des kolbenhubs in den zylindern einer zweizylinder-dickstoffpumpe
DE102005039238B4 (de) 2005-08-19 2016-05-25 Schwing Gmbh Betonfördervorrichtung mit einem Wasserkasten
DE102007050279B3 (de) 2007-10-18 2009-02-12 Schwing Gmbh Betonpumpe mit Kolbenschmierung
DE102008007069A1 (de) * 2008-01-31 2009-08-06 Putzmeister Concrete Pumps Gmbh Zylinder-/Kolbeneinheit mit in der Zylinderwandung angeordneter Muffe
DE102010019207A1 (de) * 2009-11-23 2012-01-19 Walter Werne Messkopf

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Publication number Publication date
EP3613983B1 (fr) 2022-10-05
DE102018120582A8 (de) 2020-04-09
DE102018120582A1 (de) 2020-02-27

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