DE2741942A1 - Gravel screening system - using combined loading and screening using bucket fitted with screens - Google Patents

Abstract

In a sizing system for granular material such as gravel by screning, the screening operation can be combine with the loading operation by using a bucket, fitted with screens. The screen underflow drops to the bucket bottom, and can be emptied by opening a flap. The oversize is retained on the screen and is dumped by tipping the bucket. This saves time and equipment compared with the conventional loading by power shovel and dumping into a separate screening station.

Description

Method and device for screen classification.

The invention relates to a method and a device for screen classification (Seven). The procedure is such that the material to be screened is passed through a machine with a machine Ingested a shovel equipped with a sieve and the shovel to the Sieving of the goods is moved. The device used to carry out this process consists of a machine to be combined with a sieve Bucket, which has side walls and a bottom.

The sieving of gravel has so far been carried out by hand or with sieving machines. When working with screening machines, the gravel to be screened is transported with conveyors or earthmoving machines transported from the excavation site to the screening machine and sifted in this. The sifted gravel is usually brought into storage or on a stockpile, from where it is then loaded to the deployment site.

Sieving by hand or with a sieving machine has several shortcomings afflicted: The gravel has to be turned over several times, which is time-consuming and costly is.

This continues with such a "multi-stage" treatment of the gravel easy to mix with snow so the gravel needs to be warmed. Also is that Gravel screening point is determined by the location of the screening machine, or is a relocation the sieve point only possible by moving the machine. Next are gravel screening machines technically quite complex and therefore prone to failure and costly in the acquisition. Gravel screening machines cannot generally be used in the screening area once combined with the ordinary working machines, that is, they require usually its own separate drive system.

From US Pat. No. 3,461,968 there is already a sieve classifying process confesses, in which sifting with a digging shovel combined with a sieve loader (Grave spoon) takes place. The gravel picked up with the digging shovel is by means of a sieved into these inserted sieve insert, whereby the coarse grain remains on the sieve, while the finer material flows out of the scoop through the sieve.

If Ion makes use of this sieving class procedure, sieving can be done at any point, e.g. independent of the location of the slebstation. Furthermore, this American screen display can be distributed in a simple manner with conventional machines, for example with tractors and shovel loaders, combine. In spite of this, this screening method and this screening device are also included Flawed The sieving is far from being carried out with sufficient Speed, and the sieve movements of the shovel must be parallel to the Loading process as the coarse grain is retained in the shovel while the finer material falls through the sieve insert. This device is also designed with its sieve insert to be inserted into the shovel and its drive mechanism relatively complicated. The price of such a device inevitably comes up quite a bit to be high and is in no appropriate relation to the achievable classification result.

The invention is based on the object of a new method and indicate the associated device which is free from said defects. The characteristic features of the method according to the invention and the method according to the invention Apparatus are laid down in the claims.

When working according to the method according to the invention, sieving, that is, the movements of the screen shovel during the transport of the Gravel mining site to the truck to be loaded or to the dump. This possibility is given because the sieve passage, ie the finer material, leg according to the invention The process always falls through the sieve into the shovel while the coarse grain falls is retained on the sieve. If the machine now reaches the gravel loading point, so the can be finished during the transport from the dismantling point to the loading point sieved fraction immediately - e.g. via an ejection opening - from the shovel and sieve movements during loading or dumping are unnecessary. In this way, sieving takes place flexibly and practically during the movement of the working machine from the gravel mining site to the transport device, see above that waiting times, e.g. for trucks carrying gravel, are reduced to a minimum will.

Furthermore, the screen classifying method according to the invention is cost-effective cheaper than the above-mentioned American method, since the device corresponds to it has a simpler construction and is therefore cheaper to buy stand comes. The shovel equipped with a sieve according to the invention is easy to move combine with common working machines, e.g. tractors; usually it is even sufficient to attach a simple sieve to the loading shovel. Thanks to its simplicity are the method according to the invention and the device according to the invention for everyone usable.

When working according to the method according to the invention, degradation takes place, Sieving and loading in a single operation, i.e. all unnecessary intermediate treatments omitted. This also means that there is a much lower risk of the gravel getting with it Snow mixed up, so that in many cases the purchase of heating and thawing equipment can be dispensed with. In addition, sieving according to the method according to the invention can be used at any point, i.e. independent of stationary sieving stations. In addition, the method according to the invention and the device according to the invention technically absolutely uncomplicated and therefore highly reliable and reliable are easy to maintain.

In the following, the invention is illustrated by means of an exemplary embodiment with reference to the accompanying drawing, which shows a sieve classifying device according to the invention in the Seitenancht shows, described in more detail.

In the method according to the invention, the gravel is attached to a working machine 1 attached shovel 3 provided with a sieve 2 picked up from the excavation site. Then the gravel is in the shovel 3 for the purpose of loading and sieving on a transport base brought. Sieving and loading are done simultaneously by moving the bucket 3 in Inconsistencies and if necessary by additional movements. During the sieving, the gravel passes the sieves 2 and gets along the inclined ones Areas of the shovel 3 through the opening 6 in the bottom 5 on the transport base. The coarse grain - stones - that arise during the sieving process is retained on the sieve 2 and by tilting the shovel 3 in the emptying position, it can easily be put on the waste heap be thrown off.

The working machine 1 with its shovel 3 is then ready to be picked up of the following items to be screened. Sieving can be done by moving the shovel 3 and / or the sieve.

The blade 3 combined with the working machine 1 consists of side walls 4 and the bottom 5. The shovel 3 is also provided with sieves 2, which are placed on the Bucket-like inner part 9 of the shovel 3 are placed, that the sieve passage into Inside of the shovel arrives while the coarse grain is retained. The one shown The embodiment has two screens 2. These sieves 2 are partially inside the blade 3 arranged that the blade edges 4 and the top of the screen are trough-like Form a recess in which the coarse grain remains and from where it is afterwards Seven can be tipped away. The sieves 2 are articulated with at their upper edge the upper edge of the blade 3 and at its lower edge over a separate detachable The locking device 8 is connected to the shovel 3.

The shovel shown also has an emptying opening 6, through which the sieve passage is removed from the shovel 3. The emptying opening 6 is provided with a hatch 7 for closing the opening for the duration of the sieving.

The screen sizing method according to the invention and the corresponding, Sieve classifying device provided with a vibrating device have been used in practice in Tried sieving gravel as part of an extensive research program.

As the present test results show, the inventive Procedure, especially when screening grit, compared to working remarkable advantages with screening machines.

Claims (8)

Claims 1. A method for sieving classifying (sieving), in which the material to be sieved through a combined with a working machine, equipped with a sieve Shovel added and the shovel is moved for the purpose of sieving the material, thereby characterized in that the sieving with the help of an inner placed on the shovel Sieve takes place in such a way that the sieve passage falls into the interior of the shovel, while the coarse grain (sieve residue) is retained on the sieve and tipped from there will. 2. The method according to claim 1, characterized in that the sieve passage is discharged from the inside of the bucket through an emptying opening. 3. Apparatus for performing the method according to claim 1, consisting from one to be combined with a working machine, equipped with a sieve A shovel which has side walls and a bottom, characterized in that the sieve (2) is placed on the inner part (9) of the shovel (3) and fastened in it is that the sieve passage falls into the inside of the shovel, while the coarse grain (sieve residue) is retained on the sieve. 4. Apparatus according to claim 1, characterized in that the sieve (2) is inserted into the interior of the blade (3) that the blade walls (4) and Form the top of the sieve a trough Raui for the coarse grain (sieve residue). 5. Apparatus according to claim 3 or 4, characterized in that the shovel (3) has an Entloorungs opening (6) for emptying the sieve passage the blade has. 6..Vorrichtung according to claim 5, characterized in that the emptying opening (6) is provided with a hatch (7) for closing the emptying opening. 7. Device according to one of claims 3 to 6, characterized in that that the shovel (3) has two or more screens (2). 8. Device according to one of claims 3 to 7, characterized in that that the shovel (3) has a locking device (8) for locking the sieve (2) has in the shovel.