EP0971127B1 - Piston speed modulation for a concrete pump - Google Patents

Piston speed modulation for a concrete pump Download PDF

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Publication number
EP0971127B1
EP0971127B1 EP99113575A EP99113575A EP0971127B1 EP 0971127 B1 EP0971127 B1 EP 0971127B1 EP 99113575 A EP99113575 A EP 99113575A EP 99113575 A EP99113575 A EP 99113575A EP 0971127 B1 EP0971127 B1 EP 0971127B1
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EP
European Patent Office
Prior art keywords
concrete
pump
cylinders
valve
pumping
Prior art date
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Revoked
Application number
EP99113575A
Other languages
German (de)
French (fr)
Other versions
EP0971127A1 (en
Inventor
Giorgio Moretti
Davide Cipolla
Roberto Arpini
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COMPAGNIA ITALIANA FORME ACCIAIO S P A
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Priority to CY20071100734T priority Critical patent/CY1107646T1/en
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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
    • F04B2201/00—Pump parameters
    • F04B2201/02—Piston parameters
    • F04B2201/0202—Linear speed of the piston

Definitions

  • the present invention concerns a concrete pump - of the type comprising a pair of pumping cylinders alternatively operating under the control of a backflow hydraulic pump, to draw concrete from a hopper and feed it by way of a rocking valve (S-valve) into the transport and delivery duct, and wherein said cylinders are provided with stops to control the starting movement of the S-valve - characterized in that the speed of the piston stroke of said cylinders is modulated by being increased in the initial length of said stroke, and in that electronic means are provided to control said speed according to the maximum concrete capacity allowed by the pump.
  • S-valve rocking valve

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The invention concerns a concrete pump, of the type comprising a pair of pumping cylinders alternatively operating under the control of a backflow hydraulic pump - to draw concrete from a hopper and feed it, by way of a rocking valve (S-valve), into the transport and delivery duct - wherein said cylinders are provided with stops to control the starting movement of the S-valve. According to the invention, the speed of the piston stroke of said cylinders is modulated by being increased in the initial length of said stroke, and electronic means are provided to control said speed according to the maximum concrete capacity allowed by the pump. <IMAGE>

Description

  • The present invention concerns a concrete pump comprising means to modulate the speed of the piston stroke into the pumping cylinders, said means being electronically controlled according to the maximum concrete capacity allowed by the pump.
  • The object of the invention is to improve the characteristic of the concrete capacity fed into the concrete transport and delivery duct, at the different working speeds of the pumping unit.
  • There are known to be concrete pumps which comprise a pumping unit, fed from a hopper, and a transport and delivery duct to distribute the concrete on the working site. Generally, the pumping unit consists of a pair of concrete pumping cylinders, alternatively operated by a pair of hydraulic cylinders, and of a special rocking valve (S-valve) which connects the concrete transport and delivery duct to one of the two pumping cylinders, while the other cylinder draws concrete from the hopper. The rocking S-valve is alternatively moved by a second pair of hydraulic cylinders. By combining the movement of the S-valve with the movement of the pumping cylinders, the concrete flow is generated through the transport and delivery duct. Said concrete flow is apt to move through the duct in the two directions; the concrete is actually pumped when the flow is directed from the pumping unit towards the outlet end of the duct, so as to be delivered, while it is drawn when the flow is directed in the opposite sense. The two types of operations are obtained by suitably combining the movement of the pumping cylinders with the position of the S-valve.
  • From US-A-5 332 366, US-A-5 106 272 it is further known that the speed of the pistons of the concrete-pumping cylinders may be varied and controlled during the cylinder stroke, so as to control the concrete flow rate.
  • This type of known pumps leads to cracks in the material drawn from the hopper, in the filling step of the pumping cylinders, thus involving discontinuities in the capacity of the concrete subsequently pumped into the transport and delivery duct.
  • The present invention proposes to overcome this drawback - highly unpleasant, for obvious reasons - by providing to modulate the speed at which the pistons of the pumping cylinders move into said cylinders by way of electronic control means.
  • More precisely, the present invention concerns a concrete pump - of the type comprising a pair of pumping cylinders alternatively operating under the control of a backflow hydraulic pump, to draw concrete from a hopper and feed it by way of a rocking valve (S-valve) into the transport and delivery duct, and wherein said cylinders are provided with stops to control the starting movement of the S-valve - characterized in that the speed of the piston stroke of said cylinders is modulated by being increased in the initial length of said stroke, and in that electronic means are provided to control said speed according to the maximum concrete capacity allowed by the pump.
  • In this pump, said electronic means preferably comprise a microprocessor unit, which receives the signals issued by said stops, detects and reckons the number of pumping cycles per minute, reckons the pump operating time with maximum capacity, and controls the movement of the S-valve and the reversal of the backflow hydraulic pump.
  • The invention is now described in further detail, with reference to the accompanying drawings, which illustrate a preferred embodiment thereof and in which:
    • Fig. 1 is a general diagram of a concrete pump comprising the means according to the invention; and
    • Fig. 2 diagrammatically illustrates how the means according to the invention are applied onto a pump as shown in fig. 1.
  • As shown on the drawings, a concrete pumping plant essentially comprises a pumping unit 1 fed from a hopper 2, and a transport and delivery duct (not shown) to distribute the concrete on the working site. The pumping unit 1 consists of a pair of concrete pumping cylinders 3 alternatively operated by a pair of hydraulic cylinders 4 controlled in the two directions by a backflow hydraulic pump 5 operated by a prime mover 6, and of a rocking S-valve 7 which connects the concrete transport and delivery duct to one of the two pumping cylinders 3, while the other cylinder draws concrete from the hopper 2. The S-valve 7 is alternatively moved by a second pair of hydraulic cylinders 8, fed by a hydraulic circuit with accumulator 9 and controlled by a set of solenoid valves 10. By combining the movement of the S-valve 7 with the movement of the pumping cylinders 3, a concrete flow is generated (the concrete being either pumped, or drawn) and moves, in a practically continuous but irregular manner, through the concrete transport and delivery duct.
  • According to the invention, the backflow hydraulic pump 5 - which controls the hydraulic cylinders 4 - and the S-valve 7 are operated by a microprocessor unit 11, into which are set the working cycles by a panel 12 and which receives signals issued by stops 13 of the pumping cylinders 3, and by a sensor 14 detecting the number of cycles of the pump 5. The microprocessor unit 11 controls the speed of the piston strokes of the pumping cylinders 3 according to the maximum concrete capacity allowed by the pump 5, increasing said speed in the initial length of the stroke, so as to promptly remove the cracks produced in the concrete drawn from the hopper 2, when filling said cylinders 3, to the full advantage of a homogeneous and continuous concrete delivery from the respective duct.
  • This allows to obtain curves to modulate the speed of the piston strokes, apt to improve the pumping performances according to the operating conditions and to the concrete characteristics, particularly its consistency.
  • The concrete pumping plant is controlled by the microprocessor unit 11 according to the following flow diagram:
    Figure imgb0001
    which perfectly synthesizes the sequence of the operating steps.
  • It is anyhow understood that the invention is not limited to the embodiment described heretofore, but other practical embodiments may fall within the protection scope thereof.

Claims (2)

  1. Concrete pump (1), of the type comprising a pair of pumping cylinders (3) alternately operating under the control of a backflow hydraulic pump (5) to draw concrete from a hopper (2) and feed it, by way of a rocking S-valve (7), into the transport and delivery duct, wherein said cylinders (3) are provided with stops (13) to control the starting movement of the S-valve, (7), and wherein the speed of the pistons of said cylinders (3) is not constant along their stroke; characterised in that said speed is modulated by being increased in the initial length of each piston stroke and in that electronic means are provided to control said speed according to the maximum concrete capacity allowed by the pump (1).
  2. Concrete pump as in claim 1), wherein said electronic means comprise a microprocessor unit (11), which receives the signals issued by said stops (13), reads the pumping cycles set by the operator, detects and reckons the number of pumping cycles per minute, reckons the pump operating time with maximum capacity, and controls the movement of the S-valve and the reversal of the backflow hydraulic pump.
EP99113575A 1998-07-09 1999-07-08 Piston speed modulation for a concrete pump Revoked EP0971127B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CY20071100734T CY1107646T1 (en) 1998-07-09 2007-06-04 CONSTRUCTION OF POCKET SPEED FOR A CONCRETE PUMP

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI981571 1998-07-09
IT98MI001571A ITMI981571A1 (en) 1998-07-09 1998-07-09 PUMP FOR CACESTRUZZO WITH MEANS FOR MODULATING THE SPEED OF THE PISTONS OF THE CYLINDERS OF THE PUMPING GROUP

Publications (2)

Publication Number Publication Date
EP0971127A1 EP0971127A1 (en) 2000-01-12
EP0971127B1 true EP0971127B1 (en) 2007-03-21

Family

ID=11380403

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99113575A Revoked EP0971127B1 (en) 1998-07-09 1999-07-08 Piston speed modulation for a concrete pump

Country Status (8)

Country Link
EP (1) EP0971127B1 (en)
AT (1) ATE357596T1 (en)
CY (1) CY1107646T1 (en)
DE (1) DE69935551T2 (en)
DK (1) DK0971127T3 (en)
ES (1) ES2284229T3 (en)
IT (1) ITMI981571A1 (en)
PT (1) PT971127E (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2005671C2 (en) * 2010-11-11 2012-05-14 Poppe Beheer B V C METHOD AND APPARATUS FOR PUMPS OF VISCE MASS, IN PARTICULAR MORTAR.
CN103423139B (en) * 2012-05-23 2016-04-27 中联重科股份有限公司 Pumping mechanism, control method thereof and concrete pumping equipment
DE102013104494B4 (en) * 2013-05-02 2023-11-30 MPS-Matter Pumpsysteme GmbH Thick matter pump
CN108626091B (en) * 2018-06-14 2023-04-21 贵州大学 Electromagnetic track driving piston type double-cylinder concrete pump
CN115143072B (en) * 2022-07-07 2023-03-21 中联重科股份有限公司 Control method for pumping system, processor and pumping system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5106272A (en) * 1990-10-10 1992-04-21 Schwing America, Inc. Sludge flow measuring system
DE3243738A1 (en) * 1982-11-26 1984-05-30 Karl Dipl.-Ing. 7000 Stuttgart Schlecht Hydraulic reversal for two-cylinder piston pump
DE9218858U1 (en) * 1991-05-16 1995-12-07 Sandoz-Patent-GmbH, 79539 Lörrach Double piston pump
US5332366A (en) * 1993-01-22 1994-07-26 Schwing America, Inc. Concrete pump monitoring system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
ES2284229T3 (en) 2007-11-01
ITMI981571A1 (en) 2000-01-09
CY1107646T1 (en) 2013-04-18
ATE357596T1 (en) 2007-04-15
DE69935551T2 (en) 2007-11-29
PT971127E (en) 2007-06-26
DK0971127T3 (en) 2007-07-16
EP0971127A1 (en) 2000-01-12
DE69935551D1 (en) 2007-05-03

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