FR2791389A1 - Control gate or valve for mixer for liquid concrete, has semicircular disc on central pivot, movable in front of D-shaped aperture - Google Patents

Abstract

The disc (1) has a circular outer edge and may be a segment of a circle slightly less than a full semicircle. Its curved edge seals against the curved edge of a D-shaped opening (10) with a flat floor (12). Two actuator cylinders (20,30) pull on chains (5) which may turn the valve from a closed to an open position.

Description

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  The present invention relates to a device for maneuvering the kneader door of a concrete batching plant, said door consisting of a plate in the form of a half-disc capable of pivoting and sliding by its curved peripheral edge in a groove practiced in a door body bordering a

  opening made in the bottom of said mixer.

  A concrete batching plant includes a mixer topped by a feed hopper or a silo. The mixer consists of a cylindrical tank of vertical axis inside which is animated in axial rotation a shaft provided with one or more blades which makes it possible to mix the various components necessary for the manufacture of concrete namely cement, sand, gravel

and water.

  When the concrete is ready, it is extracted through an opening in the bottom of the mixer, on the outskirts of

  it, and closed by a door as defined above.

  Given the effort to be made to pivot the door, the maneuvering thereof is carried out hydraulically by means of a rotary actuator of the pallet type, which has many drawbacks. Indeed, a rotary actuator, in addition to being bulky, heavy and expensive, has a very relative reliability, so that it is frequent not to be able to close or open the door, which is detrimental to the production of concrete . The object of the present invention is to remedy this drawback by proposing a door operating device for a mixer of a central unit of simple and inexpensive design.

  expensive, and very reliable.

  The device for operating a kneader door for a concrete plant object of the present invention o said door consists of a plate in the form of a half-disc capable of pivoting and sliding by its curved peripheral edge in a groove made in a door body bordering an opening made in the bottom of said mixer, is essentially characterized in that said door comprises a shaft coaxial with its pivot axis and projecting externally to said mixer, to which are secured by one of their ends

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  two elements capable of being wound on said shaft, over part of its circumference, one in one direction and the other in the other direction, while their other ends are

  secured to at least one linear traction means.

  According to a first embodiment of the device according to the invention, it comprises two hydraulic cylinders arranged facing each other on the door shaft along two parallel axes, substantially tangent to said shaft and passing from on either side of it, and at the end of the rod of each of which is secured the end of an element capable of

wrap around said tree.

  The opening or closing of the door is carried out by acting on one or the other of the jacks. In the closed door position, one of the elements capable of being wound around the door shaft is partially wound on said shaft and the jack rod to which it is secured is extended, while the other element n 'is not or practically not wound on said shaft and the cylinder rod to which it is secured is retracted. The retraction of the rod of the deployed jack causes the pivoting of the shaft and the winding around the latter of the other element as well as the exit of the rod to which it is secured so as to allow, afterwards, the pivoting of the shaft in

  the other direction for closing the door.

  According to a second embodiment of the device according to the invention, it comprises a double-acting hydraulic cylinder and double rod, arranged transversely with respect to the shaft of the door and next to it, and whose rods are secured by their ends to the body of said door so that the hydraulic flow causes the barrel of said cylinder to move in front of said shaft, while the ends of the elements able to wrap around said shaft are each secured to said barrel. According to a feature of the second embodiment of the device according to the invention, the power supplies to the actuator are produced by the rods which each have an axial channel opening into the barrel on each side of the piston to which are

joined said rods.

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  This embodiment is reserved for small-scale mixers, where it is not possible to accommodate two jacks facing each other. Its operation is identical to that of the first embodiment, one of the ends of each of the elements able to wrap around the door shaft is fixed near one end of the cylinder barrel, say on both sides of said shaft, and the unwinding of one of said elements by the displacement of said barrel causes the winding of the other. According to another feature of the second embodiment of the device according to the invention, the attachment to the barrel of the elements capable of being wound on the door shaft, is achieved by means of an adjustment system applying to at least one of the elements and ensuring the mounting of the latter, in an adjustable manner and with the possibility of blocking, on the barrel in order to allow an adjustment of the tension of said elements. According to an advantageous embodiment of the device according to the invention, the elements capable of being wound around

  the door shaft consist of chains.

  Advantages and characteristics of the device

  according to the invention will emerge more clearly from the description

  which follows and which relates to the attached drawing, which in

  represents several nonlimiting embodiments.

  In the appended drawing: FIG. 1 represents a plan view of a mixer door for a concrete plant equipped with a first mode of

  realization of the operating device according to the invention.

  - Figure 2 shows an elevational view of the same

device.

  - Figure 3 shows a partial schematic view

  of a second embodiment of the device according to the invention.

  With reference to FIGS. 1 and 2, one can see the door 1 of a mixer, pivotally mounted in a body 10 which extends and externally borders the opening of the mixer, not shown, and which has a semicircular wall 11 and a wall, straight 12. Door 1 consists of a shaped plate

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  substantially of a half-disc, pivotally mounted by means of a shaft 13 pivotally mounted in the body 10, and capable of being able to slide by its curved peripheral edge 14 in

  a groove 15 formed in the body 10.

  In these figures, the door 1 is shown in the closed position, it will be understood that its pivoting on 180 along the axis of the shaft 13 makes it possible to extract it from the body 10 and thus to release

opening of the mixer.

  Externally to the rectilinear wall 12 of the body 10, a housing 16 into which the end of the shaft 13 opens, is intended to house the device for operating the door 1

according to the present invention.

  This device comprises two jacks 2 and 3 placed on either side of the shaft 13, the axes of which are arranged in the same vertical plane tangent to the shaft 13, but slightly offset relative to each other in the vertical direction, and whose barrels,

  respectively 20 and 30 are secured to the body 10.

  At the end of the rod 21 of the jack 2 is secured the end 40 of a chain 4, the other end 41, not visible in Figure 2, is fixedly secured to the shaft 13 at the periphery thereof- ci at a point A. Likewise, at the end of the rod 31 of the jack 3 is joined the end 50 of a chain 5, the other end 51 of which, not visible in FIG. 2, is fixedly attached to the shaft 13 on the periphery thereof at the same point A but offset in the direction of the height, in this case the end 51 of the chain 5 is secured to the shaft 13 in

  below the end 41 of the chain 4.

  In the configuration shown, namely door 1 closed, the rod 31 of the jack 3 is returned to the barrel 30, while the rod 21 of the jack 2 is taken out, so that the chain 4 is wound around the shaft 13 and that chain 5 is

practically not.

  It will be understood that the retraction of the rod 21 has the effect of pulling on the chain 4 which causes on the one hand the pivoting of the shaft 13 and consequently that of the door 1, and on the other hand, the jack 3 being left without pressure, the winding of the

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  chain 5 around the tree. The door 1 is closed in reverse by bringing the rod 31 into the barrel 30 which has the effect of pulling on the chain, making

  pivot the shaft 13 and wind the chain 4 on it.

  This device for operating the door 1 of a mixer is of a simple design since it employs jacks

  inexpensive and very reliable linear displays.

  If we now refer to Figure 3, we can see a second embodiment of the operating device

according to the invention.

  The door 1 and the body 10 are not shown but they remain of identical design, and the operating device also takes place in the housing 16. Likewise, chains 4 and 5 are wound at least partially on the shaft 13, their ends 41 and 51 also being secured to the shaft 13 at point A offset in the

vertical direction.

  The device according to this second embodiment is particularly intended for small-scale mixers whose body is not large enough to accommodate two jacks

aligned opposite.

  In this embodiment, a cylinder 6 of special design is used, which however is also very reliable. The jack 6 is double-acting and has a double rod, it thus comprises a barrel 60 and a piston 61 to which two rods 62 and 63 are joined which pass through the flanges 64 and 65 of the barrel 60. The ends 66 and 67 of the rods, respectively 62 and 63, are secured to the body 10 so that they are immobilized and that the hydraulic supply causes the displacement of the barrel

on rods 62 and 63.

  It will be noted that due to the mobility of the barrel 60, its supply of oil cannot be carried out directly as this traditionally does, also it is carried out by means of axial channels 68 and 69 drilled in the rods respectively 62 and 63 , and which lead into the barrel 60 each

on one side of the piston 61.

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  The barrel 60 can therefore move in front of the shaft 13, tangent to it, so the end 40 of the chain 4 is secured to the barrel 60 near the flange 64, while the end 50 of the chain 5 is secured to the barrel 60 near the flange 65. The displacement of the barrel 60 allows either to pull on the chain 4 and to wind the chain 5, or to pull on the chain 5

and wind the chain 4.

  It will be noted that the connection of the chains 4 and / or 5 to the barrel 60 is carried out by means of an adjustment system 7, making it possible to adjust the tension of the chains 4 and 5 as a function

cylinder stroke 6.

  Such an adjustment system 7 applies to at least one of the chains 4 and 5 and is defined by at least one adjustable chain clevis 71, 72 made integral with the end 40, 50 of this or these chains 4, 5. Such a chain clevis yoke 71, 72 is mounted, in an adjustable manner and with the possibility of blocking.

  on a support made integral with said barrel 60 of the jack 6.

  Although the invention has been described with reference to a particular embodiment, it is understood that it is in no way limited thereto and that it is possible to make various modifications to the forms, materials and combinations of these. various elements, without departing from the framework and

the spirit of the invention.

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Claims (6)

  1. Device for operating the kneader door of a concrete batching plant, o said door (1) consists of a plate in the shape of a semi-disc capable of pivoting and sliding by its curved peripheral edge (14) in a groove (15) made in a door body (10) bordering an opening made in the bottom of said mixer, characterized in that said door (1) comprises a shaft (13) coaxial with its pivot axis and projecting outside said mixer, to which are joined by one of their ends (41, 51) two elements (4, 5) capable of being wound on said shaft (13), over part of its circumference, one in one direction and the other in the other direction, while their other ends (40, 50) are secured to at least one linear traction means (2, 3; 6). 2. Device according to claim 1, characterized in that it comprises two hydraulic cylinders (2, 3) arranged vis-à-vis on either side of the shaft (13) of the door (1) according two parallel axes, substantially tangent to said shaft (13) and passing on either side thereof, and at the end of the rod (21, 31) of each of which is secured the end (40, 50) an element (4, 5) capable of wrapping around of said tree (13).   3. Device according to claim 1, characterized in that it comprises a double-acting hydraulic cylinder and double rod (6), arranged transversely relative to the shaft (13) of the door (1) and next to it- ci, and whose rods (62, 63) are secured by their ends (66, 67) to the body (10) of said door (1) so that the hydraulic flow causes the barrel (60) to move from said cylinder (6 ) in front of said shaft (13), while the ends (40, 50) of the elements (4, 5) capable of being wound around said shaft (13) are each secured audit barrel (60).   4. Device according to claim 3, characterized in that the power supplies to the jack (6) are produced by the rods (62, 63) which each comprise an axial channel (68, 69) 8 2791389   opening into the barrel (60), on each side of its piston (61)   to which said rods (62, 63) are secured.   5. Device according to claim 3 or claim 4, characterized in that the attachment to the barrel (60) of the elements (4, 5) capable of being wound on the shaft (13) of the door is produced by the through an adjustment system (7) applying to at least one of the elements (4, 5) and ensuring the mounting of the latter, in an adjustable manner and with the possibility of blocking on the barrel (60) in view allow adjustment of the tension of said elements (4, 5).   6. Device according to any one of claims   previous, characterized in that the elements (4, 5) able to wrap around the door shaft consist of chains.