EP1306550B1 - Improved concrete pump with means to automatically adjust the working of the S-valve according to the type of concrete - Google Patents

Improved concrete pump with means to automatically adjust the working of the S-valve according to the type of concrete Download PDF

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Publication number
EP1306550B1
EP1306550B1 EP02102476A EP02102476A EP1306550B1 EP 1306550 B1 EP1306550 B1 EP 1306550B1 EP 02102476 A EP02102476 A EP 02102476A EP 02102476 A EP02102476 A EP 02102476A EP 1306550 B1 EP1306550 B1 EP 1306550B1
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EP
European Patent Office
Prior art keywords
concrete
pressure
valve
actuator
working
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
EP02102476A
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German (de)
French (fr)
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EP1306550A1 (en
Inventor
Maurizio Baldinucci
Davide Cipolla
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CIFA SpA
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CIFA SpA
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Publication date
Application filed by CIFA SpA filed Critical CIFA SpA
Priority to SI200230278T priority Critical patent/SI1306550T1/en
Publication of EP1306550A1 publication Critical patent/EP1306550A1/en
Application granted granted Critical
Publication of EP1306550B1 publication Critical patent/EP1306550B1/en
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
    • 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
    • F04B7/0026—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 oscillating movement

Definitions

  • the present invention concerns improvements in concrete pumps to automatically adjust the working thereof and provide the best performances on changing of the working conditions.
  • the invention concerns an improvement in the working system of the S-valve of the pumping unit.
  • the so-called concrete pumps comprise a pumping unit fed by a hopper and a duct to convey and deliver the concrete on the working site.
  • the pumping unit comprises a pair of cylinders apt to pump the concrete, alternately moved by a pair of hydraulic cylinders, and a special valve (S-valve) which alternately connects the concrete conveying and delivery duct with one of the two pumping cylinders, while the other draws the concrete from the hopper, and viceversa.
  • S-valve special valve
  • Such a pump is known, for example, from Italian Patents No. 1.301.562 and No. 1.301.563, in the name of the same Applicant, which are here taken as reference.
  • the alternate oscillating movement of the S-valve is obtained by means of one or more actuators which impart a pressure on the valve such as to guarantee the accelerations and speeds required to obtain the proper synchronism between the pump and the delivery duct, as well as a most regular pumping flow.
  • the pressure imparted by the actuators is preset by being planned according to the specifications of the thickest concrete presumably meant to be pumped, that is, on the basis of the supposedly hardest working conditions.
  • JP-A 1-02 061372 An example of such prior art is disclosed in JP-A 1-02 061372 in which it is provided a control system to adjust the hydraulic pressure in a working oil accumulator feeding the cylinders which drive the concrete valve.
  • the user has the possibility to manually preset this parameter, on the basis of the average effort presumably made by the pump in its activity.
  • the object of the present invention is to satisfy these requirements and to solve the problems of known technique, by supplying a pumping unit in which the actuators of the S-valve may impart a pressure according to the specific momentary conditions of the concrete being pumped, so as to avoid any useless losses of energy and the consequent malfunctions pointed out above.
  • Fig. 1 is a general diagram of a concrete pump to which the present invention is applied.
  • Fig. 2 diagrammatically illustrates how the invention is applied to a concrete pump as shown in fig. 1.
  • a concrete pumping plant essentially comprises a pumping unit 1, fed by a hopper 2, and a duct (not shown) to convey and deliver the concrete on the working site.
  • the pumping unit 1 consists of a pair of cylinders 3 apt to pump the concrete, alternately moved by a pair of hydraulic cylinders 4 controlled in the two directions by a backflow pump 5 operated by a motor 6, and of a special S-valve 7 which connects the conveying and delivery duct with one of the two pumping cylinders 3, while the other cylinder 3 draws the concrete from the hopper 2.
  • the S-valve 7 is alternately moved by an actuator 8, for example a second pair of hydraulic cylinders fed by a hydraulic circuit with accumulator 9 and controlled by a group of solenoid valves 10.
  • An electronic control box 11 controls the working of the different devices according to desired laws.
  • control circuit of the actuator 8 also comprises an electroproportional pressure reducing valve 16 and a sensor 15 of the working pressure.
  • working pressure is meant a pressure which is somehow correlated with the work required to pump the specific concrete, which is in turn function of the thickness of the actual concrete.
  • the working pressure can be considered to be the hydraulic pressure acting inside the pair of pumping cylinders 3.
  • the signal issued by the pressure sensor 15 is used as a parameter to adjust the working of the electroproportional pressure reducing valve 16, and thus the charging pressure of the accumulator 9. This allows to adjust the pressure force of the actuator 8 according to the working pressure detected by the pressure sensor 15.
  • the working pressure can be detected in a different way from that described heretofore, for instance also in a different position.
  • a technician of the field will moreover be able to apply the teachings provided herein to a different type of actuator for the movement of the S-valve - for example a compressed air actuator or an electrically controlled actuator - by suitably modifying the control system in order to adapt the invention to the specific application.
  • a different type of actuator for the movement of the S-valve - for example a compressed air actuator or an electrically controlled actuator - by suitably modifying the control system in order to adapt the invention to the specific application.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Check Valves (AREA)

Abstract

The invention concerns a concrete pump, of the type comprising a pair of pumping cylinders (3) acting, alternately, to draw the concrete from a hopper (2) and introduce it, by means of an oscillating valve (S-valve 7), into a duct conveying and delivering the material, the movement of said S-valve (7) being controlled by an actuator (8) operated by a control unit. Said pump also comprises a sensor (15) of the working pressure which causes, by means of said control unit, the working of means (16, 9) to adjust the working pressure of said actuator (8) according to the type of concrete being pumped. <IMAGE>

Description

The present invention concerns improvements in concrete pumps to automatically adjust the working thereof and provide the best performances on changing of the working conditions. In particular, the invention concerns an improvement in the working system of the S-valve of the pumping unit.
As known, the so-called concrete pumps comprise a pumping unit fed by a hopper and a duct to convey and deliver the concrete on the working site. Generally, the pumping unit comprises a pair of cylinders apt to pump the concrete, alternately moved by a pair of hydraulic cylinders, and a special valve (S-valve) which alternately connects the concrete conveying and delivery duct with one of the two pumping cylinders, while the other draws the concrete from the hopper, and viceversa.
Such a pump is known, for example, from Italian Patents No. 1.301.562 and No. 1.301.563, in the name of the same Applicant, which are here taken as reference.
By combining the movement of the S-valve with the movement of the pumping cylinders, a more or less constant flow of concrete is fed along the conveying and delivery duct of the material. Said flow is apt to cross the duct in the two directions; the actual pumping action takes place when the flow is fed from the pumping unit towards the outlet end of the delivery duct, while the drawing action takes place when the flow is fed in the opposite sense.
Generally, the alternate oscillating movement of the S-valve is obtained by means of one or more actuators which impart a pressure on the valve such as to guarantee the accelerations and speeds required to obtain the proper synchronism between the pump and the delivery duct, as well as a most regular pumping flow.
In known technique, the pressure imparted by the actuators is preset by being planned according to the specifications of the thickest concrete presumably meant to be pumped, that is, on the basis of the supposedly hardest working conditions.
An example of such prior art is disclosed in JP-A 1-02 061372 in which it is provided a control system to adjust the hydraulic pressure in a working oil accumulator feeding the cylinders which drive the concrete valve.
For this reason, when having to pump concretes with different characteristics, for instance less thick than foreseen, the excessive pressure imparted by the actuators on the S-valve creates rattlings and excessive noise, as well as determining inertial forces and oscillations which affect the whole structure and involve useless losses of energy.
In some cases, the user has the possibility to manually preset this parameter, on the basis of the average effort presumably made by the pump in its activity. The requirement however exists to be able to adjust the working of the S-valve with continuity, in an automatic manner and also while pumping the same concrete lot, the conditions of which may vary during the operation.
The object of the present invention is to satisfy these requirements and to solve the problems of known technique, by supplying a pumping unit in which the actuators of the S-valve may impart a pressure according to the specific momentary conditions of the concrete being pumped, so as to avoid any useless losses of energy and the consequent malfunctions pointed out above.
This is obtained by means of a concrete pump as briefly and basically described in the accompanying main claim.
Other aspects of the present invention are described in the subordinate claims.
Further characteristics and advantages of the concrete pump according to the present invention will anyhow be more evident from the following detailed description of a preferred embodiment thereof, given with reference to the accompanying drawings, in which:
Fig. 1 is a general diagram of a concrete pump to which the present invention is applied; and
Fig. 2 diagrammatically illustrates how the invention is applied to a concrete pump as shown in fig. 1.
With reference to the drawings, a concrete pumping plant essentially comprises a pumping unit 1, fed by a hopper 2, and a duct (not shown) to convey and deliver the concrete on the working site. The pumping unit 1 consists of a pair of cylinders 3 apt to pump the concrete, alternately moved by a pair of hydraulic cylinders 4 controlled in the two directions by a backflow pump 5 operated by a motor 6, and of a special S-valve 7 which connects the conveying and delivery duct with one of the two pumping cylinders 3, while the other cylinder 3 draws the concrete from the hopper 2. The S-valve 7 is alternately moved by an actuator 8, for example a second pair of hydraulic cylinders fed by a hydraulic circuit with accumulator 9 and controlled by a group of solenoid valves 10.
The movement of the S-valve 7 in combination with the movement of the pumping cylinders 3 produces a flow of concrete (being either pumped or drawn) which flows through the conveying and delivery duct in a practically continuous manner.
An electronic control box 11 controls the working of the different devices according to desired laws.
According to a preferred embodiment of the invention, the control circuit of the actuator 8 also comprises an electroproportional pressure reducing valve 16 and a sensor 15 of the working pressure.
By the term "working pressure " is meant a pressure which is somehow correlated with the work required to pump the specific concrete, which is in turn function of the thickness of the actual concrete. For example, as illustrated in fig. 2, the working pressure can be considered to be the hydraulic pressure acting inside the pair of pumping cylinders 3.
In the electronic control box 11 the signal issued by the pressure sensor 15 is used as a parameter to adjust the working of the electroproportional pressure reducing valve 16, and thus the charging pressure of the accumulator 9. This allows to adjust the pressure force of the actuator 8 according to the working pressure detected by the pressure sensor 15.
In practice, the more the concrete is thick and resistant, the higher is the pumping pressure detected by the sensor 15 and the more does the pressure force of the actuator 8, acting on the S-valve 7, have to be adjusted; viceversa, the more the concrete is diluted, the lower will have to be the pressure force of the actuator 8 acting on the S-valve 7.
Thanks to the use of a sensor 15 of the working pressure and to a device allowing to adjust the pressure force of the actuator 8, it is possible to instantly and automatically control the movement of the S-valve 7, so as to reach the best working conditions according to the type of concrete being pumped, and thereby avoid losses of energy, noise and rattlings.
It is anyhow understood that there can be other embodiments of the invention, without thereby departing from the protection scope thereof.
In particular, the working pressure can be detected in a different way from that described heretofore, for instance also in a different position.
A technician of the field will moreover be able to apply the teachings provided herein to a different type of actuator for the movement of the S-valve - for example a compressed air actuator or an electrically controlled actuator - by suitably modifying the control system in order to adapt the invention to the specific application.

Claims (5)

  1. Concrete pump, of the type comprising a pair of pumping cylinders (3) acting, alternately, to draw the concrete from a hopper (2) and introduce it, by means of an oscillating S-valve (7), into a duct conveying and delivering the material, the movement of said S-valve (7) being controlled by an actuator (8) operated by a control unit, characterized in that it also comprises a sensor (15) of the pump working pressure and means to adjust the pressure force of said actuator (8), said control unit causing the operation of said adjustment means on the basis of a signal issued by the pressure sensor (15), which signal depends on the type of concrete being pumped.
  2. Concrete pump as in claim 1), wherein said sensor (15) of the working pressure senses the pressure of a circuit controlling said pumping cylinders (3).
  3. Concrete pump as in claim 1) or 2), wherein said actuator (8) is of the hydraulic or pneumatic type and said adjustment means consist of a pressure reducing valve (16) apt to adjust the charging pressure of a pressure accumulator (9) of said actuator (8).
  4. Concrete pump working method, wherein an alternate pumping system is alternately connected with a concrete conveying and delivery duct by way of an oscillating valve (S-valve 7), the movement of said S-valve (7) being controlled by an actuator (8), characterized in that the pressure with which said actuator (8) acts on said valve (7) is adjusted on the basis of a signal issued by a sensor (15) of the working pressure.
  5. Concrete pump working method as in claim 4), wherein said working pressure is the pressure of a circuit controlling the pumping system.
EP02102476A 2001-10-25 2002-10-23 Improved concrete pump with means to automatically adjust the working of the S-valve according to the type of concrete Expired - Lifetime EP1306550B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200230278T SI1306550T1 (en) 2001-10-25 2002-10-23 Improved concrete pump with means to automatically adjust the working of the S-valve according to the type of concrete

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20012246 2001-10-25
IT2001MI002246A ITMI20012246A1 (en) 2001-10-25 2001-10-25 PUMP FOR CONCRETE PERFECTED WITH MEANS OF AUTOMATIC ADJUSTMENT OF THE OPERATION OF THE S-VALVE ACCORDING TO THE TYPE OF CONCRETE

Publications (2)

Publication Number Publication Date
EP1306550A1 EP1306550A1 (en) 2003-05-02
EP1306550B1 true EP1306550B1 (en) 2005-11-30

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ID=11448548

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02102476A Expired - Lifetime EP1306550B1 (en) 2001-10-25 2002-10-23 Improved concrete pump with means to automatically adjust the working of the S-valve according to the type of concrete

Country Status (8)

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EP (1) EP1306550B1 (en)
AT (1) ATE311535T1 (en)
CY (1) CY1104976T1 (en)
DE (1) DE60207670T2 (en)
DK (1) DK1306550T3 (en)
ES (1) ES2254607T3 (en)
IT (1) ITMI20012246A1 (en)
SI (1) SI1306550T1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102094779B (en) * 2010-12-28 2012-01-04 长沙中联重工科技发展股份有限公司 Concrete pump and method for adjusting driving pressure value for swinging actuator in concrete pump
DE102011012590B4 (en) * 2011-02-28 2018-05-30 Liebherr-Werk Nenzing Gmbh Method for determining the delivery rate of a liquid conveying device
CN103032421B (en) * 2012-12-26 2015-04-22 中联重科股份有限公司 Reversing hydraulic system, control method thereof and concrete pumping equipment

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3380388A (en) * 1966-02-03 1968-04-30 Robert T Sherrod Automatic control system for concrete pump
FR1532981A (en) * 1967-07-28 1968-07-12 Danken Concrete pumping device
DE3242600A1 (en) * 1981-06-09 1984-05-24 Maschinenfabrik Walter Scheele GmbH & Co KG, 4750 Unna-Massen Yoke-shaped abutment for the tube switch of a concrete pump
JPH0261372A (en) * 1988-08-24 1990-03-01 Kyokuto Kaihatsu Kogyo Co Ltd Sequence driving device for concrete pump vehicle
DE4035518C2 (en) * 1990-11-08 1994-06-09 Putzmeister Maschf Method and arrangement for determining the volume flow of conveyed material transported by means of a piston-type nitrogen pump
JP2943022B2 (en) * 1991-04-12 1999-08-30 石川島建機株式会社 Pressure control method for pumping high viscosity fluid pump

Also Published As

Publication number Publication date
ES2254607T3 (en) 2006-06-16
DE60207670T2 (en) 2006-09-07
ITMI20012246A1 (en) 2003-04-25
SI1306550T1 (en) 2006-06-30
EP1306550A1 (en) 2003-05-02
DE60207670D1 (en) 2006-01-05
CY1104976T1 (en) 2010-03-03
ATE311535T1 (en) 2005-12-15
DK1306550T3 (en) 2006-04-10

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