Abstract:
A test bed for distributing arms for distributing concrete of the type comprises a plurality of portions (14-18) serially connected to one another in a jointed manner with an end portion of the arm connected in a jointed manner to a turret (13) of the arm, the test bed (11) comprising a supporting structure (24, 40) to which the turret of the arm and active forcing means (25) are fixed that are suitable for applying a transverse force (F 1 -F 5 ) with respect to the arm to generate a preset bending moment (M 1 -M 5 ) in at least one reference section (14a-18a) of the arm.
Abstract:
Method to make an arm for the distribution of concrete (10), or other material similar to concrete, used on heavy work vehicles (11), wherein the arm (10) comprises a plurality of segments (21-25) selectively folding and extendible one with respect to the other. Each segment (21-25) comprises a main girder and auxiliary elements for connection to adjacent segments or for attachment of movement and/or supporting devices for the pipe that carries the concrete. The method comprises a first step in which each main girder (20) is formed, with a predefined length, by depositing a plurality of layers of pre-impregnated composite material in a female type mold. The method comprises a second step in which the composite material, deposited in layers in the mold in a variable number of layers, is subjected to polymerization. The method comprises a third step in which each main girder (20) is removed from the mold and a fourth step in which the auxiliary elements are associated with each girder (20) so as to form a relative segment (21-25). The method comprises a fifth step in which the extendible arm (10) is assembled, connecting the various segments (21-25) at the respective ends. The cross section of each of the main girders (20) of the segments (21-25) is substantially constant over its whole length. The female mold consists of one or more elementary molds of equal section, connected in sequence with each other according to the overall length of the main girder (20) to be made.
Abstract:
A test bed for distributing arms for distributing concrete of the type comprises a plurality of portions (14-18) serially connected to one another in a jointed manner with an end portion of the arm connected in a jointed manner to a turret (13) of the arm, the test bed (11) comprising a supporting structure (24, 40) to which the turret of the arm and active forcing means (25) are fixed that are suitable for applying a transverse force (F 1 -F 5 ) with respect to the arm to generate a preset bending moment (M 1 -M 5 ) in at least one reference section (14a-18a) of the arm.
Abstract:
A test bed for distributing arms for distributing concrete of the type comprises a plurality of portions (14-18) serially connected to one another in a jointed manner with an end portion of the arm connected in a jointed manner to a turret (13) of the arm, the test bed (11) comprising a supporting structure (24, 40) to which the turret of the arm and active forcing means (25) are fixed that are suitable for applying a transverse force (F 1 -F 5 ) with respect to the arm to generate a preset bending moment (M 1 -M 5 ) in at least one reference section (14a-18a) of the arm.
Abstract:
A driving system of the opening/closing sequence of telescopic stabiliser beams comprising multiple mobile members in a self-propelled machine, and in particular in a concrete pump. During the extension movement of the telescopic beam, the different members (A,B,C) of the same are caused to become temporarily mutually fixed, except one only thereof at a time, sequentially starting from the largest intermediate member (B) down to the terminal resting member (C) and viceversa during the retraction mevement, thanks to a mechanical structure comprising a double cam hook (3) idly pivoted about a vertical wall of each intermediate member (B) and projecting from the two sides of said wall; and a guide and/or grip elements (1,2,7) projecting from the neighbouring corresponding walls of the other members, on which said hooks (3), are apt to slide and/or engage to cause said members to become mutually fixed. Actuation of the telescopic beam can therefore be performed also with a single cylinder/piston assembly, in any case keeping the desired extraction/retraction sequence of the beam members.
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.
Abstract:
A movable pump for concrete comprises a vehicle provided with a frame (16) to which a fifth wheel (15) is fixed that is suitable for supporting a distributing arm (40) for distributing concrete, mounted rotatably thereupon, there being present a pair of front legs (17, 18) and a pair of rear legs (19, 20) for stabilising the pump that are movable between an operative position extending from the vehicle and a retracted non-operative position, the front legs being telescopic and diagonally extendible forward on opposite sides of the vehicle and each having a fixed part that is integral with said frame (16), the rear supporting legs being rotatable hinged on said frame (16) on opposite sides of the vehicle. The fixed parts of the telescopic legs are arranged near the fifth wheel (15) and the rear legs (19, 20) are hinged on the frame with hinge (21, 22) near said fifth wheel (15).
Abstract:
A system for the control and optimisation of the fuel consumption of a self-propelled machine for concrete pumping comprises a central processing unit which coordinates and controls peripheral electronic control units of the main internal combustion engine and of the pumping assembly of said machine. The peripheral units and the central processing unit are interconnected for data exchange through a CAN Bus data transmission system; said central unit processes the data received from said peripheral units and issues control signals to the same to keep the fuel consumption of the main engine down to a minimum at a desired constant flow rate, set by the user, of the concrete delivered by the pumping assembly.
Abstract:
Method to make an arm for the distribution of concrete (10), or other material similar to concrete, used on heavy work vehicles (11), wherein the arm (10) comprises a plurality of segments (21-25) selectively folding and extendible one with respect to the other. Each segment (21-25) comprises a main girder and auxiliary elements for connection to adjacent segments or for attachment of movement and/or supporting devices for the pipe that carries the concrete. The method comprises a first step in which each main girder (20) is formed, with a predefined length, by depositing a plurality of layers of pre-impregnated composite material in a female type mold. The method comprises a second step in which the composite material, deposited in layers in the mold in a variable number of layers, is subjected to polymerization. The method comprises a third step in which each main girder (20) is removed from the mold and a fourth step in which the auxiliary elements are associated with each girder (20) so as to form a relative segment (21-25). The method comprises a fifth step in which the extendible arm (10) is assembled, connecting the various segments (21-25) at the respective ends. The cross section of each of the main girders (20) of the segments (21-25) is substantially constant over its whole length. The female mold consists of one or more elementary molds of equal section, connected in sequence with each other according to the overall length of the main girder (20) to be made.
Abstract:
A movable pump for concrete comprises a vehicle provided with a frame (16) to which a fifth wheel (15) is fixed that is suitable for supporting a distributing arm (40) for distributing concrete, mounted rotatably thereupon, there being present a pair of front legs (17, 18) and a pair of rear legs (19, 20) for stabilising the pump that are movable between an operative position extending from the vehicle and a retracted non-operative position, the front legs being telescopic and diagonally extendible forward on opposite sides of the vehicle and each having a fixed part that is integral with said frame (16), the rear supporting legs being rotatable hinged on said frame (16) on opposite sides of the vehicle. The fixed parts of the telescopic legs are arranged near the fifth wheel (15) and the rear legs (19, 20) are hinged on the frame with hinge (21, 22) near said fifth wheel (15).