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EP0046902A2 - Pompe à béton - Google Patents

Pompe à béton Download PDF

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Publication number
EP0046902A2
EP0046902A2 EP81106280A EP81106280A EP0046902A2 EP 0046902 A2 EP0046902 A2 EP 0046902A2 EP 81106280 A EP81106280 A EP 81106280A EP 81106280 A EP81106280 A EP 81106280A EP 0046902 A2 EP0046902 A2 EP 0046902A2
Authority
EP
European Patent Office
Prior art keywords
valve
tank
pumping device
pumping
cylinders
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.)
Withdrawn
Application number
EP81106280A
Other languages
German (de)
English (en)
Other versions
EP0046902A3 (fr
Inventor
Alfredo Brandi
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.)
Libra SA
Original Assignee
Libra SA
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 Libra SA filed Critical Libra SA
Publication of EP0046902A2 publication Critical patent/EP0046902A2/fr
Publication of EP0046902A3 publication Critical patent/EP0046902A3/fr
Withdrawn legal-status Critical Current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

Definitions

  • the present invention relates to an improved device for the pumping of pasty material, particularly concrete.
  • a type of deviating valve is the S-shaped valve which rotates about the axis of the delivery pipe, supported by two end supports, one on the side of the pumping cylinders and the other on the side of said delivery pipe, and controlled by a hydraulic jack system in order to alternatively connect either one of a pair of pumping cylinders with the delivery pipe.
  • the present invention aims at improving the deviating valves of this type with particularly brilliant results, in that it supplies a concrete pumping device which guarantees an improvement of the suction conditions and of the volumetric efficiency, a reduced requirement for preventive maintenance, a higher working reliability and a very fast adjustment of the ,-ear parts, with obvious advantages from the point of view of the use.
  • a whole series of S-shaped deviating valves comprises, between the valve and the bottom of the hopper, devices for scraping the material of the most varied shapes; the bottom parts are mostly flat, whereby the material pieces of larger dimensions wedge in between the valve and the bottom, producing high stresses and preventing at times the rotary movement, or even causing breakages.
  • Still further solutions provide for a direct contact between the valve and the bottom of the hopper, causing the profiles of the opposed surfaces to mate.
  • the compensation for front wear of the S-shaped valve is obtained automatically by an axial displacement, operated by hydraulic means, in the directioh of the sliding surfaces.
  • the operation of the deviating valve takes place sidewards in respect of the delivery pipe; in this way, the hydraulic device for rotating the valve is within easy reach, but there is less accessibility to the hopper on the part of the truck mixers or other charging means; it is moreover necessary to provide for an expensive system of protection from possible mechanical collisions and from accidental concrete pourings.
  • a characteristic common to all known solutions is to arrange the axis of the pumping cylinders beneath the delivery pipe, thereby forming a trap which makes the cleaning difficult creating problems of material stagnation.
  • the housing (or tank) of the deviating valve is formed by two flat, parallel headwalls, holding the supports, and by two inclined sidewalls radiused with the bottom.
  • This latter is formed by a cylindrical surface, the axis of which coincides with the rotation axis of the valve.
  • the top part of said walls ends with a lip or flange, being preferably bent on the walls parallel to the rotation axis, and flat on the remaining walls.
  • This shape mates well with that of the hopper, if this is provided with a mixer.
  • the walls of the valve housing to have a completely flat lip in case of using a hopper of frustoconical shape, which generally requires no mixer.
  • valve and its housing can be associated to different types of concrete feeding hoppers.
  • the cylindrical bottom of the valve housing is constructed like an articulated reversible cover, the sealing of which is guaranteed by an elastic gasket.
  • the cover has high rigidity. Its articulation point may be on any side, but it will preferably be a hinge on the most accessible side; the hinges and the closing hook are adjustable, so as to make up in the long run for the permanent deformations of the gasket. It is moreover possible to operate the bottom cover with a hydraulically controlled kinematic motion.
  • the wall of the tank, on the side of the pumping cylinders, is provided with four ribbed ears.
  • the tank can be rotated around these ears (according to vertical axes), thereby facilitating the access to the various members of the pump for making inspections.
  • the tilting of the tank and overlying hopper may be operated manually or by hydraulic means.
  • the "S" valve is constructed in one piece, as a bent pipe of circular section and varying thickness; it bears on two end supports in correspondence of the tank headwalls.
  • the axial stresses being imparted on the valve, due to the pumping action, are born by a pair of bearings housed into the external support.
  • a flange of connection to the delivery pipe To the same is anchored a flange of connection to the delivery pipe; the connection with the delivery pipe is carried out through a lever joint, this pipe being also bent and forming an angle of 180 0 in the case of apparatuses mounted on lorries, or a right angle in the case of apparatuses mounted on a dolly or on a fixed base.
  • the section line of the material vein is formed by two opposed planes: one belonging to the ring keyed onto the valve mouth, the other to an eye-shaped wear plate forming part of the tank.
  • the wear ring is designed to have a particular shape, that is, a rake of ⁇ 30" with scraping function, as well as possessing special wear-resisting requirements.
  • the eye-shaped plate is placed in contact with the flat wall, on the side of the pumping cylinders, its fixing screws are embedded and far from the wear area, and it is made in such a way as to allow both planes to be used as counter- faces to the ring.
  • a space is provided between the lower edge of the "S" valve and the bottom cover, in accordance with the invention, said space being dimensioned according to the largest granulometry of the material to be pumped, and housing a rib fixedly connected to the valve itself and acting as support for blades scraping the bottom.
  • the material interposing in this space cannot stagnate, due to the self-cleaning action operated by the blades.
  • Such blades are made so as to have a rake of ⁇ 30° and they are fixed to the rib of the valve in such a way as to allow taking up the wear clearance. Since in this function the counterface is constituted by the bottom cover, this latter is provided to be lined with a wear plate fixed with screws. In this way the cover will no longer undergo wear.
  • the valve is operated by two opposed hydraulic cylinders which are coupled on one side with a crank and on the other side with ears obtained directly on the tank.
  • the device consists of two pumping cylinders 1 with push-pull operating pistons 2.
  • the two pistons sucks the material from the hopper 3
  • the other piston pumps the material into the delivery pipe 4 through the valve 5, which is in the appropriate position.
  • the suction mouth 6 of the cylinders communicates with an open area inside the tank 7, such as not to limit the flow of the material being sucked.
  • an open area inside the tank 7 such as not to limit the flow of the material being sucked.
  • no resistance should be opposed, as this would have a negative effect on the volumetric efficiency of the pump.
  • the position of the suction mouth which is just below the bottom of the hopper, favours the suction process, increasing the filling level of the cylinders.
  • the tank 7, into which flows the material from the hopper 3 and which houses the valve 5, is formed by two flat, parallel headwalls 8 and by two partially inclined sidewalls 9, which form a rest surface for the cylindrical bottom cover 10.
  • the cylinder ends 11 in the form of telescopes connected, through joints, with the cylinder liners.
  • the device comprises moreover appropriately ribbed ears 12, around which the whole assembly can be rotated, thereby creating a passageway for operations of maintenance.
  • the valve support 13 through which is operated the "S" valve.
  • the eye-shaped wear plate 14 On the inside of the wall and parallel thereto bears the eye-shaped wear plate 14, which is fixed by screws and nuts 15-16 and positioned with adjusting screws 17.
  • Said wear plate will preferably have, in correspondence of its fixing holes, recesses on both its surfaces, so that it can be mounted first with one surface and then, after wear of this latter, with the other surface, after rotation by 180°.
  • the recesses for the fixing screws are far from the areas subjected to wear, so as not to create any areas of absorption of abrasive bodies.
  • the external valve support 18 On the flat wall 8, opposite to that described, is mounted the external valve support 18 on the side of the delivery pipe.
  • Said support houses the ball (or roller) bearings 19, apt to bear the axial stresses deriving from the pumping pressure and the radial stresses deriving from the "S" shape of the valve.
  • On this same support is anchored the flange 20 of connection to the delivery pipe 4; all this is connected to the tank 7 by means of screws 21-22.
  • the support 18 also houses two wear bushings 23-24 and two sealing rings 25 which slide on said bushings, thereby preventing the outlet of fluid from the tank and from the delivery pipe.
  • the purpose of said bushings is to fully preserve the valve from normal wear which may occur in the long run between the reciprocating parts, considering that the valve 5 - in the context of the apparatus - is a relatively costly element.
  • the deviating valve 5 is formed by a circular tube with an evenly decreasing diameter - from the side of the cylinders towards the side of the delivery pipe - and with a suitable "S" shape so that, by alternatively oscillating about the axis Y, it connects the delivery pipe 4 with the pumping cylinders 1 through the telescopic ends 11.
  • the axis of the mouth of the valve 5, which extends towards the telescopic ends 11 of the cylinders, is positioned higher than the axis of the mouth which extends towards the delivery pipe 4.
  • the "S" valve finds itself in optimal conditions for the cleaning operations, since the risks of material stagnation - present in the known solutions - are thereby eliminated.
  • the actual valve body acts as rotation pin, while on the side of the cylinders the rotation pin 26 is inserted in the valve body and fixedly connected thereto by known methods. On said pin 26 is rigidly keyed a crank 27, onto which hinge the ends of the actuating cylinders 28.
  • the support 13 will house a sealing element and a bearing for rotation, as in the case of the support 18.
  • a wear ring 29 is keyed on the valve mouth, on the side of the cylinders, the surface of said ring sliding onto the face of the eye-shaped plate 14; such ring protects the valve body and will preferably be made of a particularly abrasion-proof material, it being possible to improve this characteristic by an appropriate previous heat-treatment.
  • the outer shape of said ring will have a rake of ⁇ 30°, so as to obtain an improved scraping action in respect of the plate and consequently a self-cleaning effect.
  • the wear clearance can be compensated in two ways, as can be argued from figures 5 and 6: that is, either by moving the ring 29 towards the plate 14 - by acting on the screws 30 contained in the two ears 31 obtained on the valve body - or by moving the plate 14 towards the ring 29 - by acting on the adjusting screws 17 and on the corresponding fixing screws 15-16.
  • Figure 7 shows a vertical section of the tank and of the valve, close to the external support 18, in which can be noted the structural detail of the valve and of the bottom cover.
  • the valve has a stout and strongly projecting rib 32, acting as support for the scraping blades 33 which are apt to slide onto the bottom cover 10; the geometrical shape is designed with a rake of ⁇ 30°, to obtain an improved scraping and self-cleaning action.
  • the bottom cover joins with the tank in correspondence of the flat edge, which is provided to house a seal 36; the anchorage can be obtained through the pins 37 and by a rotation on all the sides.
  • adjustable locking hook 38 is shown in figure 2. Different solutions can however be adopted, for instance by using a hydraulic cylinder, apt to keep the cover in a closing position, and others still.
  • this plate 35 Onto the bottom there is also a wear plate 35, which is anchored to the cover 10 by means of oval-headed socket screws and self-locking nuts 39-40. Also this plate, like the heretofore described wear parts, can be easily replaced without the basic structure suffering from any damages due to wear.
  • the slack between the blades 33 and the plate 35 can be taken up by moving the blades towards the plate, thanks to the slots provided in the anchorage rib 32 in correspondence of the securing through screws 34.
  • the operation of adjustment or of replacement of the above elements can easily be carried out with open cover.
  • the wear elements 33 and 35 have high wear-resisting characteristics.
  • a rim 41 is obtained on the upper part of the tank 7, said rim having a rectilinear shape in correspondence of the walls 8 and a concave curved shape on the sides 9.
  • Said concave shape is designed to coincide with the convex shape of the bottom of the hopper 3, shown in figure 1, into which rotates a shaft with blades, or screw, having the function of mixing the material and sending it towards the tank 7.
  • a set of holes 42 is furthermore provided to obtain the connection between the tank and the hopper.
  • the hopper 3, visible in figures 1 and 2 represents a solution which has been found to be the best, especially for pumps mounted on lorries.
  • bracket 43 for anchoring the cylinder 28 which operates the valve; it is advisable for this bracket to be obtained in one piece (by casting) with the tank into which should preferably discharge the stresses due to the thrust of the cylinders. Also different solutions are however possible.
  • Figure 8 shows, in accordance with the invention, a side view of the pumping device, mounted on a chassis.
  • the bulk determined by the differential gear 44 has been placed in evidence, said bulk being common to all the types and makes of current lorries, which are mostly preferred for the combination in question.
  • the "X" axis of the pumping cylinders is inclined, in respect of the horizontal line, by an angle of ⁇ ⁇ 8°;
  • the "Y” axis is the rotation centre of the valve and of the delivery pipe, and is positioned beneath the "X” axis;
  • the "Z” axis tangent to the wheel of the lorry 46 and passing through the lowest point of the pump, determines with the ground level a profile angle of ⁇ ⁇ 12°; the dimension "A” results ⁇ 1350, and the dimension "B” results ⁇ 2500.
  • the delivery pipe 4 which in the embodiment of figures 3 and 8 is bent by 180° and has a uniformly decreasing diameter, will be preferably straight so as to be connected to a stationary network.
  • Figure 8 also illustrates the articulation point 45 between the structure of the pump 7 and the base frame.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP81106280A 1980-09-03 1981-08-12 Pompe à béton Withdrawn EP0046902A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT24428/80A IT1132633B (it) 1980-09-03 1980-09-03 Dispositivo per il pompaggio di materiale pastoso,specialmente di calcestruzzo
IT2442880 1980-09-03

Publications (2)

Publication Number Publication Date
EP0046902A2 true EP0046902A2 (fr) 1982-03-10
EP0046902A3 EP0046902A3 (fr) 1982-03-17

Family

ID=11213487

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81106280A Withdrawn EP0046902A3 (fr) 1980-09-03 1981-08-12 Pompe à béton

Country Status (2)

Country Link
EP (1) EP0046902A3 (fr)
IT (1) IT1132633B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4569642A (en) * 1982-01-22 1986-02-11 Dwyer Anthony F Slurry pump
GB2325026A (en) * 1997-05-07 1998-11-11 Yu Lin Huang Slurry pump
CN115324061A (zh) * 2022-08-26 2022-11-11 中建桥梁有限公司 一种建筑基坑浇筑用混凝土输送装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3298322A (en) * 1966-04-20 1967-01-17 Robert T Sherrod Pump for semi-fluid materials
DE1285319B (de) * 1960-08-08 1968-12-12 Schwing Friedrich Wilh Zuteilvorrichtung im Masseaufgabebehaelter einer hydraulisch betriebenen Kolbenpumpefuer dickfluessige Massen
US3663129A (en) * 1970-09-18 1972-05-16 Leon A Antosh Concrete pump
FR2158963A5 (fr) * 1971-10-26 1973-06-15 Stetter Georg
FR2247628A1 (en) * 1973-10-12 1975-05-09 Italiana Forme Acciaio Compagn Three-way distributor for twin-cylinder concrete pump - has rotatable S-shaped pipe section connecting with one or other cylinder
US3989420A (en) * 1974-05-15 1976-11-02 J. I. Case Company Concrete pumping apparatus
FR2359290A1 (fr) * 1976-07-21 1978-02-17 Schwing Gmbh F Pompe a deux cylindres, en particulier pour le transfert de beton
DE2814845A1 (de) * 1978-04-06 1979-10-11 Stetter Gmbh Vorrichtung zum lagern, dosieren und foerdern von breiigen massen, insbesondere beton

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1285319B (de) * 1960-08-08 1968-12-12 Schwing Friedrich Wilh Zuteilvorrichtung im Masseaufgabebehaelter einer hydraulisch betriebenen Kolbenpumpefuer dickfluessige Massen
US3298322A (en) * 1966-04-20 1967-01-17 Robert T Sherrod Pump for semi-fluid materials
US3663129A (en) * 1970-09-18 1972-05-16 Leon A Antosh Concrete pump
FR2158963A5 (fr) * 1971-10-26 1973-06-15 Stetter Georg
FR2247628A1 (en) * 1973-10-12 1975-05-09 Italiana Forme Acciaio Compagn Three-way distributor for twin-cylinder concrete pump - has rotatable S-shaped pipe section connecting with one or other cylinder
US3989420A (en) * 1974-05-15 1976-11-02 J. I. Case Company Concrete pumping apparatus
FR2359290A1 (fr) * 1976-07-21 1978-02-17 Schwing Gmbh F Pompe a deux cylindres, en particulier pour le transfert de beton
DE2814845A1 (de) * 1978-04-06 1979-10-11 Stetter Gmbh Vorrichtung zum lagern, dosieren und foerdern von breiigen massen, insbesondere beton

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4569642A (en) * 1982-01-22 1986-02-11 Dwyer Anthony F Slurry pump
GB2325026A (en) * 1997-05-07 1998-11-11 Yu Lin Huang Slurry pump
GB2325026B (en) * 1997-05-07 1999-03-10 Yu Lin Huang A slurry supplying mechanism
CN115324061A (zh) * 2022-08-26 2022-11-11 中建桥梁有限公司 一种建筑基坑浇筑用混凝土输送装置

Also Published As

Publication number Publication date
IT1132633B (it) 1986-07-02
EP0046902A3 (fr) 1982-03-17
IT8024428A0 (it) 1980-09-03

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Inventor name: BRANDI, ALFREDO