DE4418469C2 - Air-pulsed setting machine for the preparation of solid mixtures - Google Patents

Description

The invention relates to an air-pulsed setting machine for the preparation of Solid mixtures, especially coal or other minerals, with a or several setting chambers filled with separating liquid, in which a setting bed from the solids to be processed by pulsating stroke movements of the Separation liquid is layered according to the density of the solids and in which to Raising the bed at least one air chamber open below and below Set bed is arranged, the pulse air supply lines through valves periodically ge opens and closes.

The pulsating stroke movement of the separating liquid is controlled at known typesetting machines by controlling the pulse air with the help of these venti le, by alternately supplying compressed air to the air chamber via a valve (intake valve) flows in and then comes out of the air via another valve (exhaust valve) always flows into the atmosphere.

DE 23 52 798 C3 describes a setting machine in which the air chambers Compressed air (pulsed air) supplied via an electronic valve pulse control is, the openings of the compressed air lines ge through poppet valves closed and opened.

Since large amounts of air flow through the openings of the Compressed air lines must flow, these openings and the assigned to them Neten valve plate designed accordingly large, which has the consequence that for loading operate the valves correspondingly large forces (the pressure difference between the Compressed air and atmospheric air multiplied by the valve disc size)  must be wound, which is a sensitive regulation or control of the Valves opposes and complex devices for actuating the valves requires.

It is an object of the invention to provide a setting machine in which this ge mentioned disadvantages are eliminated and with simple means a sensitive Regulation of the valves is possible.

The task is solved with the features of the labeling part of the Claim 1. Advantageous embodiments of the invention are in the Unteran sayings.

Due to the inventive design of the valves as double-plate valves two openings of the pulse air supply lines are advantageous for each valve closed or opened so that, for example, with the same air flow the individual openings in the pulse air supply line can be made smaller with correspondingly smaller valve plates. But it is also possible with Beibehal the size of the openings, now that two openings are open or be closed, with advantage immediately after actuation of the valves to press larger amounts of air into the air chamber or to let it flow out sen, whereby a "steeper" stroke is achieved.

Another important advantage of the invention is the arrangement of the Given valve plate. The fact that the two valve plates with a distance central guide rod are interconnected, and a valve plate one Opening the pulse air supply from the inside opens or closes and at the same time the second valve plate opens the second opening of the pulse air supply line from the outside or closes, the pressures acting on the valves lift each other so that only a small amount of force is required to actuate the valves becomes. This force can now be transmitted from the outside via a piston-cylinder unit the guide rod is connected, hydraulically or pneumatically be applied, it being particularly advantageous in the pneumatic Piston cylinder unit the compressed air (pulse air) already available Use the blower.  

Since only slight forces are required to actuate the valve guide rod, it is also advantageously possible according to the invention that the guide rod with is connected to an electromagnetic drive or part of an electro is magnetic actuator, which means a particularly delay-free valve actuation is done by electrical means.

Furthermore, it is also possible according to the invention, the guide rod on her Allocate a diaphragm drive at the end or at both ends, the hydrau lisch or pneumatically works and the same with pneumatic operation can be supplied with the existing pulse air.

Depending on the choice of the drive device for the guide rod, it may be necessary or be advantageous in that the forces for opening or closing the valves are different sizes. According to the invention, this can be done in a simple manner by achieving that the openings in the pulse air supply line and the them ordered valve plates are of different sizes.

Further advantages, features and details of the invention result from the the following explanations for shown in schematic drawing figures Embodiments of an intake valve.

Show it

Fig. 1 shows a section through an inlet valve with a piston cylinder unit for its drive,

Fig. 2 shows a section through an inlet valve with a diaphragm actuator.

The drawing figure 1 shows a wind boiler ( 11 ), in which a working fan ( 10 ) feeds compressed air. In the air chamber ( 11 ) opens a pulse air supply line ( 15 ), which - not shown in the drawing - is connected to an air chamber of a setting machine.

Opposite each other there are two openings ( 23 , 24 ) in the air chamber ( 11 ) in the pulse air supply ( 15 ), which are closed by the valve disks ( 13 , 14 ) [in the state shown]. The two valve disks ( 13 , 14 ) are connected to a guide rod ( 12 ) which leads out of the wind chamber ( 11 ) and is connected to a piston-cylinder unit ( 17 ) arranged gas-tight on the wind chamber ( 11 ) by means of seals ( 21 ).

The pneumatically operating piston-cylinder unit ( 17 ) in the example shown is connected via lines ( 20 ) to a blower ( 19 ) and to an intermediate control unit ( 18 ). But it is also possible to connect the piston-cylinder unit ( 17 ) via a line ( 22 ) with the Ar beitsgebläse ( 10 ) while eliminating the blower ( 19 ).

When the setting machine is in operation, compressed air is pressed into the air chamber ( 11 ) by the working fan ( 10 ) and the working pressure P is maintained therein. The water pressure P now acts on the inside closing valve plate ( 14 ) in the drawing from bottom to top, and on the outside closing valve plate ( 13 ) in the drawing from top to bottom, ie, since both valve plates with the common guide rod ( 12 ) are connected, compensate for the pressure acting on the valve plate with the result that the tear-off forces are very small and the valve plate ( 13 , 14 ) with little effort by axial displacement of the guide rod Ver ( 12 ) from its seat have it lifted, thereby opening the openings ( 23 , 24 ). The compressed air is pressed into the pulsed air supply line ( 15 ) by the working pressure P prevailing in the wind boiler ( 11 ) and flows through it as pulsed air ( 16 ) towards the air chamber.

With the same little effort, the valve plates ( 13 , 14 ) can also be lowered onto the openings ( 23 , 24 ) with the help of the guide rod ( 12 ) and closed. The pulsed air flowing back through the stroke movement of the separating liquid from the air chambers is now released into the atmospheric air via other valves, the outlet valves. These exhaust valves are designed in the same manner as the intake valves, for example in the same way as in the illustrated embodiment, so that the advantages and features described also apply to these valves in the same way.

In the embodiment of an inlet valve shown in the drawing figure 2, the guide rod ( 12 ) is connected at its upper end to a membrane ( 30 ) and at its lower end to a membrane ( 25 ). The membranes ( 30 , 25 ) are laterally firmly anchored in the housing ( 28 , 29 ) and connected centrally with the guide rod ( 12 ).

By pulsing a fluid into the housings ( 28 , 29 ) - controlled by a control unit ( 18 ) - the membranes ( 30 , 25 ) are moved up and down and this movement is transmitted to the guide rod. The top dead center of the opening movement of the guide rod ( 12 ) can be adjusted in a simple manner by means of an adjustable stop ( 26 ) arranged in the upper diaphragm housing ( 28 ).

In the example shown, air is pressed as a fluid by a fan ( 19 ) via the lines ( 27 ) into the membrane housing ( 28 , 29 ). However, in this embodiment it is also possible to remove the air from the existing working fan ( 10 ) or to use a liquid as the fluid.

In the exemplary embodiment in FIG. 2, the openings ( 23 , 24 ) of the pulse air supply device ( 15 ) and the valve plates ( 13 , 14 ) assigned to the openings ( 23 , 24 ) are of different sizes [in the example shown, the upper opening ( 24 ) smaller than the lower opening ( 23 )]. In this way, a resultant pressure can advantageously be set in a predetermined direction, in the example shown in the "open" direction, and thus the valve control and a positive influence can be taken.

Claims (6)

1.Air-pulsed setting machine for the preparation of solid mixtures, in particular coal or other minerals, with one or more setting chambers filled with separating liquid, in which a setting bed is layered from the solids to be processed by pulsating lifting movements of the separating liquid according to the density of the solids and in which To raise the setting bed, at least one air chamber open at the bottom is arranged below the setting bed, the pulse air supply lines of which are periodically opened and closed by valves, characterized in that the valves are designed as double-plate valves with a central guide rod ( 12 ) on which the valve plate ( 13 , 14 ) are arranged at a distance so that when the guide rod ( 12 ) is axially displaced, a valve plate ( 13 ) periodically opens and closes the pulse air supply line ( 15 ) from the outside and the other valve plate ( 14 ) the pulse air supply line ( 15 ) from the inside. 2. Air-pulsed setting machine according to claim 1, characterized in that the guide rod ( 12 ) for axial displacement with a Kolbenzylin dereinheit ( 17 ) is connected, which works hydraulically or pneumatically. 3. Air-pulsed setting machine according to claim 2, characterized in that the pneumatically operating piston-cylinder unit is connected via a line ( 22 ) to the working fan ( 10 ). 4. Air-pulsed setting machine according to claim 1, characterized in that the guide rod ( 12 ) is part of an electromagnetic drive. 5. Air-pulsed setting machine according to claim 1, characterized in that the guide rod ( 12 ) is connected at one end or at both ends with a diaphragm drive ( 25 , 30 ) which works hydraulically or pneumatically. 6. Air-pulsed setting machine according to claim 1, characterized in that the openings ( 23 , 24 ) and the associated valve plate ( 14 , 13 ) differ in size.