FR2720297A1 - Blown air loading machine for preparing solids mixtures. - Google Patents

Abstract

a) Blown air loading machine for preparing mixtures of solids b) machine characterized in that the valves are valves with two plates provided with a guide rod (12), central bearing distant one of the further the valve plates (13, 14) so that for an axial sliding movement of the guide rod (12), a valve plate (13) periodically opens and closes the forced air line (15) from from the outside and the other valve plate (14) periodically opens and closes the forced air line (15) from the inside.

Description

"Air-blown charging machine for preparing machines

swaddles of solids ".

  The present invention relates to a machine for

  pulsed air charging to prepare material mixtures

  solid materials, in particular of coal and other minerals, comprising one or more loading chambers filled with a separating liquid, and in which a loading bed formed of the solids to be prepared is laminated,

  by the movement of pulsed lifting of the separating liquid

  to stratify according to the density of the solid

  and in which, to lift the loading bed, there is at least one air chamber open downward below the loading bed and whose lines

  pulsed air supply are open and closed periodically

  by the valves The control of the pulsating uplift movement

  separation liquid is used in

  known by the control of the pulsed air by means of the valves in that alternating compressed air arrives in the air chamber through a valve (inlet valve) and this air escapes from this air chamber to the atmosphere through another valve (exhaust valve).

  Thus, document DE 23 52 789 describes a machine

  China of loading whose inner tubes receive

  compressed air (forced air) through a

  electronic pulse control valve; the openings

  compressed air lines are closed and open

by plate valves.

  As large quantities of air

  In a short space of time, the openings of the compressed air lines, these openings and

  Associated valve plates are of appro-

  asked; as a result, it is necessary to exert

  bearing to operate the valves (these efforts

  correspond to the pressure difference between the air

  award-winning and atmospheric air, multiplied by the surface of the valve trays); this is opposed to regulation or

  a finesse control of the valves and requires

  complicated positives to operate the valves.

  The present invention aims to create a loading machine overcoming such drawbacks and to ensure with simple means a regulation

finesse of the valves.

  To this end, the invention relates to a loading device of the type defined above, characterized in that the valves are two-plate valves provided with a guide rod (12), central carrying remote one of the other the valve plates (13, 14) so that

  for an axial sliding movement of the guiding rod

  (12), a valve plate (13) opens and closes

  the forced air line (15) from the outside and the other valve plate (14) periodically opens and closes the pulsed air line (15) from the inside. The embodiment according to the invention of the valves in the form of two-tray valves, offers the advantage

  that each valve closes or simultaneously opens two openings

  pulsed air ducts so that, for example

  for the same air flow we can give smaller

  at each opening in the forced air line,

  and use valve trays of smaller dimensions

  tites, corresponding. But it is also possible to keep the dimensions of the openings which allows the simultaneous opening or closing of two openings, to provide or to let out quantities of air

  more important directly after the actuation of the

  popes, in the inner tube which gives an operation

with a steeper rise.

  Another essential advantage of the invention is

  side in the arrangement of the valve trays. Because the two valve plates are connected to each other remotely, via a central guide bar, and a valve plate opens from the inside an opening of the forced air line or the

  close and at the same time the second valve plate or-

  close or close from the outside the second opening of the

  forced air line, the pressures exerted on the

  They compensate each other so that a weak force is sufficient to actuate the valves. This force can thus be applied from the outside by a jack connected to the guide rod, hydraulically or pneumatically controlled; it is particularly advantageous to use a pneumatic cylinder since this makes it possible to use compressed air, available (air

  pulsed) supplied by the working fan.

  Since only weak forces for action-

  the guide rod of the valve, it is advantageous

  it is possible, according to the invention, to connect the rod of

  guidance to an electromagnetic drive means or

  core that it constitutes a part of an electromagnetic drive means which allows to actuate the valve with

  a particularly low inertia, electrically

  than. It is further possible according to the invention to associate with the guide rod, at one of its ends or at both ends, a hydraulic or pneumatic membrane drive means; in the case of operation

  the pneumatic membrane, the membrane can be urged

already existing.

  Depending on the choice of the driving device of the guide rod, it may be necessary or advantageous that the forces ensuring the opening or closing of the valves are of different importance. According to the invention this is achieved simply by giving different dimensions to the openings of the air duct

  pulsed and associated valve plates.

  The present invention will be described below in more detail with the aid of embodiments shown in the drawings in which: - Figure 1 is a section of an intake valve driven by a jack, - the figure 2 is a section of a valve

  intake with a diaphragm drive.

  Figure 1 shows an air supply tank 11

  compressed air by a blowing machine 10. A forced air line 15 opens into the air tank 11; this pipe is connected to an inner tube of a

  loading machine (not shown in the drawings).

  Two openings 23, 24 are provided face to face in the forced air pipe 13 inside the air tank 11; these openings are closed (in the position shown) by two valve plates 13, 14. The two

  valve plates 13, 14 are connected to a guide rod

  step 12 leaving the air tank 11; this stem is

  linked to a cylinder 17 mounted in a gastight manner by

  seals 21 on the air tank 11.

  The jack 17 with pneumatic operation in the example shown is connected by lines 20 to a

  blower 19 and a control unit 18

  médiaire. It is also possible to remove the blower 19 and connect the cylinder 17 by a pipe 22

to the blower 10.

  When the loading machine is running, the

  blower 10 provides compressed air to the reservoir.

  see air 11 and maintains a useful pressure P. This

  pressure P acts from bottom to top, according to the drawing on the

  valve body 14 which closes inwards; in the case of the valve plate 13 closing from the outside according to the drawing, this pressure acts from top to bottom; since the two valve plates are connected to one and the same guide rod 12, the pressures acting on the plates of the valves compensate each other, which makes it possible to apply only

  very low step forces; the trays of sou-

  pope 13, 14 can lift their seat under the effect of a weak force by the axial displacement of the guide rod 12 to thereby release the openings 23, 24. The compressed air is pulsed by the prevailing pressure P in the air tank 11 towards the forced air line 15; this air travels this pipe like pulsed air 16 in the direction

of the inner tube.

  The valve plates 13, 14 are lowered by

  again with the aid of the guide rod 12 against the openings

  23, 24 to close them with a reduced force, cor-

  sponding. The pulsed air returning from the tubes due to the lifting movement of the separating fluid is evacuated by other valves, that is to say the exhaust valves to the atmospheric air. These exhaust valves are made as the valves

  admission, for example as in the example shown.

  The benefits and features described apply

  in the same way to these valves.

  In the embodiment of an intake valve shown in FIG. 2, the guide rod 12 is provided at its upper end with a membrane 30

  and at its lower end, a membrane 25. The members

  branes 30, 25 are hinged integrally on the side of the housing 28, 29; in the middle the membranes are connected to the

guide rod 12.

  The pulsed injection of a fluid into the housing 28, 29 (controlled by a control unit 18) raises and lowers the membranes 30, 25; this movement is transmitted to the guide rod. By an adjustable unit 26 provided in the upper housing 28 of the membrane, the top dead center of the opening movement of the diaphragm is simply adjusted.

guide rod 12.

  In the exemplary embodiment shown, the

  fluid which is air, is pushed by a machine that suffers

  19 by the lines 27 in the membrane housings 28, 29. It is also possible to provide a variant according to

  the air is taken from the blower 10,

  aunt; it is also possible to use a liquid as a fluid.

  In the embodiment of Figure 2, the openings 23, 24 of the forced air pipe 15 and

  that the valve plates 13, 14 associated with these openings

  res 23, 24 are dimensioned differently (in the embodiment shown, the upper opening 24 is

  lower than the lower opening 23). This allows

  to obtain a resulting pressure in a di-

  predetermined correction; in the example shown, the presetting is in the direction of the opening. We have

  a positive influence on the control of the valve.

Claims (3)

R E V E N D I C A T IO NS   1) Forced air charging machine for pre-   mixtures of solids, especially   and other minerals, having one or more loading chambers filled with a separating liquid, and in which a loading bed formed of   solids to be prepared by the lifting movement   pulsating liquid separator, for stratifying according to the density of solids and in which, to lift the loading bed, there is at least one air chamber open down below the loading bed   and whose supply lines for forced air are   green and periodically closed by means of valves, characterized in that the valves are two-plate valves provided with a guide rod (12), with the central core carrying the valve plates (13, 14) at a distance from one another ) so that for axial sliding movement of the guide rod (12), a valve plate (13) periodically opens and closes the forced air pipe (15) from the outside and the other plate valve (14) periodically opens and closes the forced air line (15) from the inside.   2) A forced air charging machine according to claim 1, characterized in that the guide rod (12) is connected to a jack (17) for axial sliding,   this jack operating hydraulically or pneumatically   than. 3) Forced air charging machine according to the   claim 2, characterized in that the pneumatic cylinder   that is connected by a pipe (22) to the blower (10). 4) Pulsed air loading machine according to claim 1, characterized in that the guide rod   (12) is part of an electromagnetic drive means than.   Pulsed air loading machine according to claim 1, characterized in that the guide rod   (12) is connected by one or both ends   to a membrane drive means (25, 30)   hydraulically or pneumatically.   6) A forced-air charging machine according to claim 1, characterized in that the corresponding openings (23, 24) and valve plates (14, 13) have different dimensions.