DE924036C - Mixing plant for the production of mix for road construction or the like. - Google Patents

Description

Mixing plant for the production of mix for road construction or the like. The main patent relates to a mixing plant for road building materials, in which the dated Bucket elevator of the mixing plant incoming stone material in uninterrupted run to a Weighing reel arrives and from this periodically in constant succession to the mixing tub is tipped shut, the addition of binding agent with the tilting movement of the weighing reel is coupled, in such a way that the respective discarded, fixed in terms of weight Stone quantity the binding agent is added in precisely dosed quantities.

In order to achieve this in an impeccable manner, according to the main patent the material thrown from the bucket elevator in constant succession via a hopper fed to a main or weighing container, the flaps of the closable Bottom openings of both containers are necessarily coupled to one another in opposite directions, in such a way that when the filling weight set on a balance beam is reached of the main container, the bottom flap of which is opened, is being emptied and at the same time the bottom flap of the pre-container is inevitably closed, by the material weighed in the main container during the emptying of the bucket elevator to temporarily record any material.

Here, the device is made so that it is in the main container Material coming to be weighed acts vertically on the balance beam by means of a rod and by the vertical shift of the main container at; Reach the one--. provided material weight quantity.seine Bodenlz: lapp «is triggered.

When the emptied main container and its pre-container go up As a result of the balance beam weight -will the bottom flap of the main container durch.eiri _ "(; egengewicht closed and locked, at the same time inevitably the bottom flap of the pre-container is opened, the accumulated material in the closed bottom The main container is omitted and this subsequently falls freely through the pre-container through the bucket elevator until the set material weight is reached is charged.

The bottom flap of the main container is in its closed position through a shift linkage. secures the release arm at the appropriate time is actuated by a tear-off cam of a rotating sprocket, which cam at the given time also brings about the opening of the bottom flap.

The bottom flaps are then controlled mechanically by weights, locking and unlocking and is one in the rough operation Subject to constant wear and tear, which can lead to operational disruptions can.

In order to - remove this disadvantage - see the procedure according to the Invention is that "-the control, the opening and closing -the inevitable Flaps of the - lockable - bottom openings, which are coupled to one another in opposite directions - of the - - from the bucket elevator fed the hopper and weighing hopper by means of Compressed air takes place. - It is useful to have two with one controlled by the balance beam Three-way valve alternating with - cylinder pistons charged with the pressure medium provided, which controls the closable bottom openings of the Vorbehälters.und the Bring up the weighing container ..

Through the pneumatic actuation or control of the container bottom flaps a much higher precision is achieved compared to the mechanical control. the The force exerted by the air switch is able to open the flaps suddenly or close. Counterweights and special holding devices are no longer used required, since the respective position is held under pressure: -The pneumatic Control is far superior to mechanical, also economically. is more reliable, cheaper and simpler in maintenance and arrangement: In - the drawing is a device for performing the method, for example - illustrates namely shows- -Fig. i the establishment at the time of filling the main or Weighing hardener, Fig. 2 a detail, the switch tap of the = pressure cylinder in the middle section. = A linkage acts on the balance beam-i with the adjustable sliding weight z from two support rails 3 honor. - The latter are the carriers of the Hätipt - or - weighing container ¢ and the reservoir 5. The latter has the pivotable bottom flap 6, as also the main tank q. equipped with the pivotable bottom flap 8 is. Both bottom flaps 6 and 8 are inevitably counter-rotating due to the linkage i o connected with each other.

That, open and close the bottom flaps 6 and 8 in the appropriate Point in time takes place by means of compressed air. This is why two cylinders 16, 17 are arranged, their piston rods on the double lever connected to the axis of rotation 18 of the bottom flap 8 i9 act and at the same time via the lever arm 2o, the linkage io and the lever 21 influence the open and closed position of the bottom flap 6.

The supply of compressed air to the cylinders 16, 17 takes place through the Main line 22, the distributor tap 23 and its branch lines 2 [, 25.

To control the air distribution valve 23, its = plug 26 is also included equipped with a lever arm 27, which by a driver 28 of the support rails 3 is switched when they rise and fall.

Since the stroke of the support rails 3 and thus the driver 28 is also small; special training is required. of the straw chick 26 with regard to its passages .-- The three-way valve 23 with the access $ 2, the outlets -29 and 3o to cylinder 16 or: - = i7 @ and the exit3i to the open air is owned by the chick 26, which requires a rotation of about 15 ° for switching To enable the outlet 29 or 3o, the plug 26 has two separate T-shaped Passages 32, 33, which are held as elongated slots in the longitudinal direction of the chick are, in order not to slow down the compressed air speed, rather fully on the cylinders 16; 17 to bring into effect. In the position shown, the air supply is from Access 28 is given via 32 to the outlet 29 to the cylinder 16, while the air from Cylinder 17 can escape into the open via Kanal3o, 33 through outlet 31. at the order. Switching the plug 26 by a few degrees of rotation, the cylinder 17 is under Pressure applied while cylinder 16 is unloaded.

The cock plug training shown can be used anywhere with a small angle of rotation of the chick to use equally well. .

The working process is as follows: At the beginning, the weighing beam 1, 2 presses the empty containers ¢, 5 by means of the support rails 3 in the drawn-up position. The bottom flap 8 of the main container is closed by the cylinder piston 1 6 and at the same time the flap 6 of the pre-container is opened by means of the linkage. The material from the bucket elevator 15 arrives in free fall through the intermediate container 5 into the main container 4. As soon as this has reached the desired material weight amount set on the balance beam i; - he knocks out both containers q. and 5 go down; wherein the driver 28 controls the distributor valve ä3, in such a way that the cylinder i 6 is switched off suddenly and the cylinder 17 is switched on, so that the flap 8 opens, the flap 6 of the reservoir 5 closes on the other hand. The in the main tank q. The material is precisely weighed and is not used in the mixing tub, on a conveyor belt or used for other purposes.

This continues while the main container ¢ is being emptied from the bucket elevator Accruing material is temporarily removed from the hopper 5, which is closed at the bottom added until the balance beam i, 2 the emptied main container q. including the holding tank 5 returns to superscript.

Here, the driver 28 reverses the distributor tap 23, the bottom flap 8 is closed suddenly, the flap 6 of the pre-container 5 is opened, whereupon the process is repeated periodically.

Claims (3)

PATENT CLAIMS: i. Mixing plant for the production of mixes for road od. Like. According to Patent 900 580, in open up and closing of the positively counter coupled together flaps (6, 8) of the closable bottom openings of the loaded from the bucket conveyor (1 5) Vorbehälters by a Preßluftsteuerung ( 5) and weighing container (q). 2. Mixing system according to claim i, characterized by two cylinders (1 6, 1 7) charged alternately with compressed air via a balance arm (i) controlled three-way valve (23), the piston rods of which on a double lever (1 9) of the bottom flap axis of rotation (1 8 ) act and in transmission by a lever arm (2o) and a linkage (io) simultaneously control the bottom flap (6) in opposite directions with respect to the flap (8). 3. Mixing system according to claim 2, characterized in that the three-way valve (23) is controlled by the balance beam (i) or its linkage (3) , which the lever arm (27) of the up and down gear by means of a driver (28) Hahnkükens pivoted. ¢. Three-way valve for the mixing plant according to claims 2 and 3, characterized in that its plug (26) has two separate T-shaped passages (32, 33) which are advantageously held as elongated slots in the longitudinal direction of the plug.