EP4000837A1 - Machine for construction site with offset vibration source - Google Patents

Abstract

Construction machine configured for pumping and/or mixing pasty and/or viscous products such as mortars, concretes, fluid screeds, and more generally all fluid products used in the field of building and construction, comprising a chassis (10), a receptacle (11), mounted on the frame (10), defining a reception volume and an introduction opening opening into the reception volume, a screen (40), mounted in a removable or retractable manner with respect to to the frame (10), having a working position in which the screen (40) extends over the introduction opening, and a vibration source (51), in which the vibration source (51) is integral with the frame ( 10), remote from the screen (40), and in which the vibratory source (51) is configured to transmit to the screen (40) a vibratory movement via a disengageable connector (60) when the screen (40) is in its working position. The disengageable connector (60) is configured to maintain the connection between the vibration source (51) and the screen (40) under the sole effect of the weight of the screen (40).

Description

Technical area

This presentation relates to a construction machine configured for pumping and/or mixing pasty and viscous products such as mortars, concretes, fluid screeds, and more generally all fluid products used in the field of building and construction.

Prior technique

In the field of construction, on a construction site, construction machines are conventionally used for pumping and/or mixing fluid, pasty and/or viscous products, such as mortars, screeds, cements or even concretes, in order to supply the site's needs for such products.

An example of such a construction machine according to the state of the art is shown in the Fig. 1 and 2 . Such a construction machine 81 takes the form of a trailer fitted with wheels 82 and a coupling system 83. It comprises a frame 84, a pumping device 85 and a distribution module 86. It also comprises a hopper 87, mounted on the frame 84, closed by a hinged cover 88 in which an opening 89 is formed. This hopper 87 is intended to receive a fluid product to be distributed on a construction site, for example a screed. A mixer truck thus feeds this hopper 87 with product through the opening 89. A sieve 90 is provided at the top of the hopper 87 in order to retain any undesirable particles of large dimensions such as pebbles.

Such a construction machine 81 also comprises a drive device 91 mounted in the frame 84, combining a heat engine, for example of the diesel type, with a hydraulic machine. The output shaft 92 of this drive device is coupled to a transmission shaft 93 using a first coupling part 94. The transmission shaft 93 carries transmission means 93a intended to facilitate the transport of the fluid product to the outlet orifice of the hopper 87. Here, these transmission means take the shape of an Archimedes screw 93a but it could also be pallets, to name but a few examples.

Conventionally, in such a machine of the state of the art, a vibrator 94 is mounted on one of the sides of the frame 90a carrying the grid 90. Such a vibrator 94 makes it possible to animate the grid 90 with a vibratory movement allowing to facilitate the flow of the fluid product.

However, such a vibrator has a large mass, which leads to mechanical strength problems. In particular, since the vibrator is mounted directly on the member receiving the vibrations, there is generally a progressive loosening of the fixing elements of the vibrator under the effect of the vibrations.

In addition, because of its position along the grid, the vibrator is exposed to possible projections of the fluid product, or of solid elements present in the latter, which can damage the vibrator or even an element providing the energy necessary for the operation of the vibrator, an electric cable for example.

There is therefore a real need for a construction machine configured for pumping and/or mixing fluid, pasty and/or viscous products such as mortars, concretes and fluid screeds, and which is devoid, at least in part, of disadvantages inherent in the aforementioned known configuration.

Disclosure of Invention

This presentation relates to a construction machine, configured for pumping and/or mixing fluid, pasty and/or viscous products such as mortars, concretes and fluid screeds, comprising a frame, a receptacle, mounted on the frame, defining a reception volume and an introduction opening opening into the reception volume, a screen, mounted in a removable or retractable manner relative to the frame, having a working position in which the screen extends over the introduction opening , and a vibration source, wherein the vibration source is mounted on the frame, remote from the screen, and wherein the vibration source is configured to transmit to the screen, when the screen is in its working position, a vibratory movement by means of a vibratory transmission comprising a disengageable connector.

Thus, thanks to such a configuration, it is possible to animate the screen with a vibratory movement while deporting the vibratory source at a distance from the screen. In this way, it is possible to protect the vibration source from the environment of the screen, and therefore to prevent premature degradation of the vibration source.

In addition, since the vibration source is now mounted on the frame, and no longer on the screen, the mechanical strength of the assembly is reinforced. In particular, this makes it possible to transfer the mass of the vibrator to the frame of the machine and therefore to lighten the screen.

Furthermore, thanks to this disengageable connector, it is possible to deport the vibration source while preserving the removability or the retractable nature of the screen in order, in particular, to be able to easily access the interior of the reception volume without it being necessary to dismantle the screen or another element transmitting the vibratory movement.

In certain embodiments, the vibration transmission, and in particular the disengageable connector, is configured to maintain the connection between the vibration source and the screen under the sole effect of the weight of the screen. In other words, no tool or manipulation of the disengageable connector is necessary to establish and maintain the connection once the screen is installed in the working position. Thus, it greatly facilitates the implementation of the machine, especially when it is desired to remove or retract the screen.

In other embodiments, the vibration transmission, and in particular the disengageable connector, comprises a quick fastening device making it possible to maintain the connection between the vibration source and the screen. This quick fastening device may in particular comprise a latch, a pin or even an eccentric handle. In such a case, the establishment and breaking of the connection can be done in a simple and easy manner, by a simple manipulation of the quick fastening device, without having to resort to any tool.

In other embodiments, the vibration transmission, and in particular the disengageable connector, comprises a bolted attachment.

In certain embodiments, the disengageable connector comprises a female part, fixed to one element from among the vibration source and the screen, and a male part, fixed to the other element from among the vibration source and the screen, configured to engage in the female part. Thus, the establishment of the connection can be done simply and quickly by simple engagement of the male part in the female part.

In some embodiments, the female part is secured to the vibration source and the male part is secured to the screen. In this way, it is easier to establish the connection of the disengageable connector when placing the screen in its working position.

In certain embodiments, the female part and the male part of the disengageable connector each have a tapered portion. Such a tapered shape facilitates the engagement of the male part in the female part and guarantees at least one point of contact between the female part and the male part.

In some embodiments, said frustoconical portions are frustoconical of revolution; in other words, they are truncated cones of revolution.

In certain embodiments, said frustoconical portions are truncated pyramids, for example with 3 or 4 faces.

In certain embodiments, the taper of the female part is substantially equal to the taper of the male part.

In certain embodiments, the cone angle formed by the male part is between 3 and 50°, preferably between 15 and 35°, more preferably between 20 and 30°. These angle ranges make it possible to reduce, or even completely eliminate, the appearance of parasitic vertical movements of the screen. Indeed, the inventors have observed that the frustoconical shape of the disengageable connector could cause, under the effect of vibrations, a vortex movement of the male part of the connector within the female part: the male part then tends to go up the along the female part before descending, which generates a significant noise and high energy loss reducing the efficiency of the vibration source.

In certain embodiments, the cone angle formed by the female part is between 3 and 50°, preferably between 15 and 35°, more preferably between 20 and 30°.

In certain embodiments, the contact material of at least one element among the female part and the male part of the disengageable connector is softer than the contact material of the other element among the female part and the male part. In this respect, the Vickers hardness can for example be used. This makes it possible to reduce the wear of the disengageable connector or, at the very least, to favor the wear of one of the parts of the connector relative to the other. In particular, the softer material may be that of the female part. For example, one can be a polymeric material, of the plastic type for example, that is to say non-elastomeric, while the other can be a metal, stainless steel for example.

In certain embodiments, the female part of the disengageable connector comprises a contact lining made of polymeric material, of the plastic type for example, that is to say non-elastomeric. In addition to the advantages described above, such a fitting makes it possible to attenuate the noise generated by any parasitic movements of the connector. Such a lining can also be removable, which facilitates its replacement in the event of wear.

In certain embodiments, at least one of the parts of the disengageable connector is provided on one of the side walls of the screen, preferably its rear surface. In particular, this part can be carried by a bracket projecting from the surface of the screen.

In certain embodiments, the part of the disengageable connector integral with the screen is laterally centered with respect to the center of gravity of the screen. In this way, the transmission of the vibratory movement to the screen is facilitated. In particular, the appearance of parasitic moments which can generate parasitic movements and therefore additional noise and a loss of energy reducing the efficiency of the vibration source is reduced.

In certain embodiments, the part of the disengageable connector integral with the screen is centered in elevation with respect to the center of gravity of the screen. In this way, the transmission of the vibratory movement to the screen is facilitated. In particular, the appearance of spurious moments which can generate spurious movements and therefore additional noise is reduced.

In some embodiments, the vibration source is mounted floating relative to the chassis, preferably via dampers. In this way, the vibrations generated by the vibration source do not propagate to the chassis and, in particular, to the receiving volume. These shock absorbers can in particular be of the silent block, spring or even rubber cylinder type.

In certain embodiments, the vibration source is mounted on the frame via a bracket mounted on the frame in a floating manner, preferably via shock absorbers. These shock absorbers can in particular be of the silent block, spring or even rubber cylinder type. In this way, it is avoided that the vibrations generated by the vibration source are propagated to the frame. The vibration source can for its part be rigidly mounted on the console.

In certain embodiments, the part of the disengageable connector secured to the vibration source is provided on the console. This part can for example be located at the end of an arm extending towards the front of the machine.

In some embodiments, the console is a substantially planar part extending in a horizontal plane.

In some embodiments, the bracket has at least three, and preferably exactly three, non-aligned attachment points with the frame.

In some embodiments, at least one console attachment point secures the console from below and at least one console attachment point secures the console from above. In this way, the shock absorbers of all the fixing points act in compression, which tends to perpetuate them.

In certain embodiments, the center of gravity of the screen is positioned substantially in the horizontal plane of the console when the screen is in its working position. In this way, the transmission of vibratory motion at the screen is facilitated. In particular, the appearance of spurious moments which can generate spurious movements and therefore additional noise is reduced.

In some embodiments, the vibration source is configured to generate vibrations in a horizontal plane.

In some embodiments, the vibration source is a pneumatic or electric vibrator.

In certain embodiments, the center of gravity of the vibration source is positioned substantially in the horizontal plane of the console. In this way, the transmission of the vibratory movement to the screen is facilitated. In particular, the appearance of spurious moments which can generate spurious movements and therefore additional noise is reduced.

In some embodiments, the screen is pivotable relative to the frame. This allows easy access to the interior of the receiving volume.

In some embodiments, the screen is configured to pivot around a horizontal axis, preferably around the right-left direction of the machine. In particular, the screen may comprise bearings arranged at its side opposite the disengageable connector, preferably at its front side. Preferably, each bearing comprises a damper: each bearing can also be carried by a support mounted on a damper.

In some embodiments, the screen is removable and interchangeable. Beyond being able to provide access to the interior of the reception volume, this makes it possible to easily change the screen depending on the product used, for example.

In some embodiments, the screen is mounted floating relative to the frame, preferably via shock absorbers. In this way, the vibrations generated by the vibration source do not propagate to the chassis and, in particular, to the receiving volume. These shock absorbers can in particular be of the silent block, spring or even rubber cylinder type.

In some embodiments, the screen is carried by the frame in its working position via at least three support points, and preferably exactly three support points.

In some embodiments, two support points of the screen are formed by bearings.

In some embodiments, a fulcrum of the screen is formed by the disengageable connector.

In some embodiments, the screen rests on the disengageable connector when it is in its working position. The mass of the screen thus makes it possible to maintain the connection of the disengageable connector.

In certain embodiments, the receptacle is a hopper allowing the flow of the product towards a discharge line.

In certain embodiments, the discharge line includes at least one spiral transmission shaft.

In some embodiments, the discharge line includes at least one progressive cavity pump.

The aforementioned characteristics and advantages, as well as others, will become apparent on reading the following detailed description of an embodiment of the construction machine proposed. This detailed description refers to the accompanying drawings.

Brief description of the drawings

The appended drawings are schematic and are primarily intended to illustrate the principles of the disclosure.

• [Fig. 1] La figure 1 est une machine de chantier selon l'état de la technique.
• [Fig. 2] La figure 2 est une autre vue de la machine de chantier de la figure 1.
• [Fig. 3] La figure 3 est une vue en perspective d'une machine de chantier selon l'exposé.
• [Fig. 4] La figure 4 est une vue centrée sur le crible de la machine de la figure 3.
• [Fig. 5] La figure 5 est une vue éclatée du système vibratoire de la machine de la figure 3.
• [Fig. 6] La figure 6 est une vue en coupe du système vibratoire, crible relevé.
• [Fig. 7] La figure 7 est une vue en coupe du système vibratoire, crible dans sa position de travail.

In these drawings, from one figure to another, identical elements (or parts of elements) are identified by the same reference signs.

• [ Fig. 1 ] The figure 1 is a state-of-the-art construction machine.
• [ Fig. 2 ] The figure 2 is another view of the construction machine from the figure 1 .
• [ Fig. 3 ] The picture 3 is a perspective view of a construction machine as described.
• [ Fig. 4 ] The figure 4 is a view centered on the machine screen of the picture 3 .
• [ Fig. 5 ] The figure 5 is an exploded view of the vibration system of the machine from the picture 3 .
• [ Fig. 6 ] The figure 6 is a cross-sectional view of the vibratory system, screen raised.
• [ Fig. 7 ] The figure 7 is a sectional view of the vibratory system, screen in its working position.

Description of embodiments

In order to make the explanation more concrete, an example of a construction machine is described in detail below, with reference to the appended drawings. It is recalled that the invention is not limited to this example.

The picture 3 illustrates an example of construction machine 1 according to the presentation. This construction machine 1 takes the form of a trailer fitted with wheels 2 and a coupling system 3. It comprises a frame 10, a pumping device 20 and a distribution module 30.

As is best seen on the figure 4 , the construction machine 1 also comprises a hopper 11, mounted in the frame 10 and intended to receive a fluid, viscous and/or pasty product supplied by a mixer truck. A screen 40 is provided at the top of the hopper 11, allowing, in addition to its function of safety and protection against rotating elements, to retain any undesirable particles of large dimensions such as pebbles.

This screen 40 comprises a frame 41, rectangular, formed of four side walls 41a-41d, and a plurality of angle irons 42 extending between the left 41b and right 41d side walls of the frame 41. These angle irons 42 are rectilinear and extend all parallel in the same plane; they have a chevron shape whose edge is directed upwards.

The screen 40 is pivotally mounted on the frame 10 via bearings 43 provided at the front of the frame 41, more precisely at the front end of the left 41b and right 41d side walls. These bearings 43 have the particularity of being floating, that is to say that they have a damping member making it possible to reduce the transmission of parasitic movements such as vibrations between the screen 40 and the frame 10.

Thanks to these bearings 43, the screen 40 can be pivoted between a working position, horizontal, represented on the picture 3 for example, in which it is interposed in front of the insertion opening of the hopper 11, and a raised position, represented on the figure 4 for example, in which it is raised in a vertical position, or beyond the vertical, and thus leaves free access to the interior volume of the hopper 11.

The construction machine 1 also includes a vibration system 50 including a vibrator 51 forming a vibration source. In the present example, the vibrator 51 is an electric vibrator having a vertical axis on which an eccentric flyweight is provided. It therefore produces a vibratory movement propagating essentially in the horizontal plane. This vibratory movement is transmitted to the screen 40 via a vibratory transmission.

The vibratory system 50 also comprises a bracket 52, forming part of this vibratory transmission, allowing the fixing of the vibrator 51 on the frame 10. This bracket 52 takes the form of a flat frame having three uprights, a front upright 53a and two uprights lateral 53b, 53c, organized in an isosceles triangle. The vibrator 51 is fixed rigidly to a fixing portion 54 of the bracket 52 provided at the intersection of the two side uprights 53b, 53c.

The bracket 52 also includes three fixing points 55a, 55b, 55c, located at the three intersections of the three uprights 53a-53c. The two front attachment points 55a and 55b are attached to a beam 12 of the frame 10 extending horizontally in the left-right direction of the machine 1. This attachment is ensured in a floating manner by means of shock absorbers 56 of the type silent block. The rear attachment point 55c is fixed for its part on a structural arm 13 attached rigidly to the frame 10 and extending substantially vertically; more precisely the rear attachment point 55c is fixed under a bracket 13a extending horizontally from the structural arm 13. This attachment is also ensured in a floating manner by means of a shock absorber 56 of the silent block type. Thus, thanks to these floating fixings, the vibrations produced by the vibrator 51 do not propagate, or practically not, to the frame 10.

The vibratory movement of the vibrator 51 is on the other hand transmitted to the screen 40, when it is in its working position, by means of a disengageable connector 60. This disengageable connector 60, forming part of the vibratory transmission, comprises a part male 61, carried by the screen 40, and a female part 66, carried by the console 52 of the vibratory system 50.

More precisely, the male part 61 takes the form of a finger 62 having a tapered profile. This finger 62 extends vertically downwards from a bracket 44 provided in the middle of the rear side wall 41a of the frame 41 of the screen 40. The finger 62 is removable in order to be able to replace it in the event of wear. In the present example, this finger 62 is made of stainless steel; the angle formed by its conicity is equal to 25°.

The female part 66 for its part takes the form of a ring 67 having a frustoconical inner surface. The central axis of this inner surface extends vertically; the angle formed by its taper is equal to that of finger 62, ie 25° in the present example. This ring 67 is a fitting attached to a cavity 57 of the console 52, this cavity 57 being provided at the end of an arm 58 extending forwards from the middle of the front upright 53a of the console 52. In the present example, this ring 67 is made of hard plastic, more precisely of PA6.

Thus, when the screen 40 is in its working position, the finger 62 engages in the ring 67, which connects the screen 40 to the vibratory system 50: the vibratory movement of vibrator 51 can thus propagate to the screen 40 .

In this respect, the position of the finger 62 is provided to be located substantially on the front-rear axis passing through the center of gravity of the screen 40. The ring 67, and more generally the whole of the bracket 52, is provided to be located substantially in the horizontal plane passing through the center of gravity of the vibrator 51. In this way, when the screen 40 is in its working position, the vibratory movement of the vibrator can be propagated to the screen by minimizing the losses of energy and the appearance of parasitic moments.

It can also be noted that the disengageable connector 60 then forms a third point of support for the screen 40 when it is in its resting position. work. In particular, the weight of the screen 40 alone makes it possible to effectively maintain the connection of the disengageable connector.

Conversely, when it is desired to access the interior volume of the hopper 11, it suffices to pivot the screen 40 around the bearings 43 to disengage the disengageable connector 60.

Although the present invention has been described with reference to specific embodiments, it is obvious that modifications and changes can be made to these examples without departing from the general scope of the invention as defined by the claims. In particular, individual features of the different illustrated/mentioned embodiments can be combined in additional embodiments. Accordingly, the description and the drawings should be considered in an illustrative rather than restrictive sense.

In particular, in the examples presented, the site machine takes the form of a trailer mounted on wheels, but it goes without saying that it could also be provided with skids to simply be placed on the site or even that it could be mounted in a vehicle. Similarly, in the examples presented, the machine performs both a mixing function and once a fluid product pumping function, but it goes without saying that it could only perform one of these functions, for example only mixing. .

It is also obvious that all the characteristics described with reference to a method can be transposed, alone or in combination, to a device, and conversely, all the characteristics described with reference to a device can be transposed, alone or in combination, to a method.

Claims (9)

Construction machine, configured for pumping and/or the mixing of fluid, pasty and/or viscous products such as mortars, concretes and fluid screeds, comprising a frame (10), a receptacle (11), mounted on the frame (10), defining a reception volume and an introduction opening opening into the reception volume, a screen (40), mounted in a removable or retractable manner relative to the frame (10), having a working position in which the screen (40) extends over the introduction opening, and a vibration source (51), wherein the vibration source (51) is mounted on the frame (10), remote from the screen (40), and in which the vibratory source (51) is configured to transmit to the screen, when the screen (40) is in its working position, a vibratory movement via a vibratory transmission comprising a disengageable connector (60), wherein the disengageable connector (60) is configured to maintain the connection between the vibration source (51) and the screen (40) under the sole effect of the weight of the screen (40). Machine according to claim 1, in which the disengageable connector comprises a female part (66), secured to one element (51) from among the vibration source and the screen, and a male part (61), secured to the other element (40) from among the vibration source and the screen , configured to engage the female part (66), and wherein the female part (66) and the male part (61) of the disengageable connector each have a tapered portion. Machine according to Claim 2, in which the cone angle formed by the male part (61) and/or by the female part (66) is comprised between 3 and 50°, preferably between 15 and 35°, more preferably between 20 and 30°. Machine according to claim 2 or 3, in which the contact material of at least one element (66) among the female part and the male part of the disengageable connector (60) is softer than the contact material of the other element (61) among the female part and the male part. Machine according to any one of Claims 2 to 4, in which at least one (61) of the parts of the disengageable connector (60) is provided on one of the side walls (41a-41d) of the screen (40), preferably its rear surface (41a). Machine according to any one of Claims 1 to 5, wherein the vibration source (51) is mounted on the frame (10) via a bracket (52) mounted on the frame (10) in a floating manner, preferably via dampers (56) , and wherein the part (66) of the disengageable connector (60) secured to the vibration source (51) is provided on the console (52). Machine according to Claim 6, in which the center of gravity of the screen (40) is positioned substantially in the horizontal plane of the bracket (52) when the screen (40) is in its working position, and in which the center of gravity of the vibration source (51) is positioned substantially in the horizontal plane of the console (52). Machine according to any one of Claims 1 to 7, in which the screen (40) is mounted floating with respect to the frame (10), preferably by means of shock absorbers. Machine according to any one of Claims 1 to 8, in which the screen (40) is carried by the frame (10) in its working position via at least three support points, wherein two support points of the screen (40) are formed by bearings (43), and wherein a screen fulcrum (40) is formed by the disengageable connector (60).

Images