FI58963C - FOERFARANDE OCH ANORDNING FOER SAOLLNING AV FAST MATERIAL - Google Patents

Description

R25CT ΓΒΐ NOTICE OF PUBLICATION CQO, T

lBJ (11) UTLÄGGNINGSSKRIFT 5 8963 • # ^ 5 C Patent granted on 11 05 1981

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Patent · och regi «t« r »tyret — n 'AnsMun uttagd och uti.ikrifMo pubUcmd 30. oi. oi (32) (33) (31) Fyydttty MU0lk * it —togtrd prlorltut (71) (72) Heimo J. Leinonen, 821 ^ 0 Kiihtelysvaara, Finland-Finland (FI) (7 * 0 Papula Rein Lahtela Oy (5U) Method and apparatus for screening solids - Förfarande och anordning för sällning av fast material

The invention relates to a method for screening a solid material, mainly gravel, in which the material to be screened is taken by injecting it into a screened bucket connected to a working machine and the bucket is moved to screen the material. The invention further relates to an apparatus for carrying out the method according to the invention, comprising a plug-in bucket with a screen to be connected to a working machine, comprising side edges and a base.

In the past, gravel screening has been performed manually or on screening machines. When using screening machines, the screening takes place in such a way that the gravel to be screened is transferred from the gravel pick-up site to the screening machine by conveyors or earthmoving machines. The gravel is then mechanically screened by means of said screening machine. Screened gravel is usually transported to a warehouse or storage heap, from where the gravel is loaded for transport to the site of use.

58963 2

Further, from U.S. Pat. No. 3,461,968 discloses a screening method in which screening is performed by means of an excavating bucket connected to a screen loader. In this case, the gravel injected into the digging bucket is screened through a screen lid to be placed on top of the bucket, the coarse fraction remaining inside the screen and the smaller materials screening out of the bucket through the screen lid.

There are several disadvantages to manual and screening. The gravel has to be processed several times, which makes processing slow and expensive. Furthermore, the gravel easily mixes with the snow during processing, which means that the gravel has to be heated. Furthermore, the gravel screening location is limited depending on the location of the machine, or only the movement of the machine allows the screening site to be moved. In addition, gravel screening machines are technically quite demanding and therefore also prone to operational disturbances and expensive to purchase. Gravel screening machines usually cannot be connected to the most common work machines, even in connection with a screening site, in which case they require their own separate drive and power machines.

Using the screening method disclosed in the above-mentioned U.S. Patent Publication, the screening can be performed anywhere regardless of locally, e.g., the location of the screening station. Furthermore, this American screen bucket can be connected relatively easily to ordinary work machines, e.g. a tractor or a bucket-load spreader. Despite its advantages, this screening method and apparatus also has drawbacks. Screening is far from fast enough; the screening movements of the bucket have to be performed at the same time as the loading, because the coarse fraction remains in the bucket as the finer materials are screened through the screen lid. Still the device is relatively complex with its screen covers placed on top of the bucket and its drive mechanisms, as well as power units. In this case, the price of the device is forcibly relatively high and does not correspond to the screening results achieved with the device.

It is an object of the present invention to obviate the above drawbacks and to provide a new, developed method and apparatus for performing screening 3,5963 in which the above drawbacks do not occur. The features of the method and device according to the invention are set out in the claims.

When using the method according to the invention, screening can be carried out, i. the movements of the sieve bucket can be performed during transport when moving from the gravel pick-up site to the car or warehouse pile to be loaded. This is based on the fact that in the method according to the invention the screened, finer fraction always passes through the sieve inside the bucket with the coarse fraction remaining on the sieve. When the implement moves to the loading target, the fraction pre-screened during the transfer is ready to be removed from inside the bucket, e.g. through the discharge opening, and the screening movements are thus unnecessary when performing loading or stacking. In this way, the screening takes place flexibly and conveniently during the movement of the working machine, while the waiting times of the transport equipment, e.g. the truck, are reduced to a minimum.

Furthermore, the screening method according to the invention is cheaper than the disclosed American method due to the simpler structure of the corresponding device and the consequent lower purchase price. A bucket with a screen according to the invention can be easily connected to ordinary work machines, e.g. a tractor, it is usually sufficient to attach a simple screen to the finished bucket. In this case, the screening method and device according to the invention form a so-called the screening method and apparatus for each man.

When using the method according to the invention, the gravel has to be treated in connection with screening and loading only once, in which case unnecessary treatment times are eliminated. In this case, the gravel cannot easily mix with the snow either, which in many cases saves on the purchase of heating and smelting equipment. Furthermore, the gravel can be screened by the method according to the invention anywhere, regardless of the fixed screening sites. Still the method and the corresponding device are technically very simple and thus reliable and inexpensive to maintain.

The invention will now be described in detail by means of an exemplary embodiment with reference to the accompanying drawing, in which Figure 4 58963 shows a side view of a device according to the invention for performing screening.

In the method according to the invention, the gravel is taken from the gravel pick-up point to a bucket 3 with a screen 2 connected to the working machine 1. The gravel is then transported in a bucket 3 on a transport pallet for screening and loading. .Screening and loading take place simultaneously with 3 bucket movements to oblique positions and with additional movements when additional power is required. During the screening, the gravel descends through the screens 2 along the inclined surfaces of the bucket 3 from the opening 6 of the base 5 to the transport platform. The coarser fraction generated in the screening, the rock waste, remains on the screens 2, from where it can be conveniently transferred to the waste heap and dropped off by turning the bucket 3 to the emptying position. The implement 1 with its buckets 3 is then ready for use for the next screening. Screening can be done with 3 bucket movements and / or sieve movements.

The bucket 3 connected to the working machine 1 shown in Fig. 1 comprises sliding edges 4 and a base 5. The bucket is further provided with a screen 2 connected to the cup-like inner part of the bucket 3 so that the screened fraction passing through the screen enters the bucket with the coarser fraction remaining on the screen. The screen 2 is articulated at its upper edge to the upper edge of the bucket 3 and at the lower edge by means of a separate, openable locking device 8. There are two screens 2 in this application. The screens 2 are arranged partly inside the bucket 3 so that the edges 4 of the bucket and the cover side of the screen form a bucket-like space in which the coarse fraction remains during screening and from which it can be poured out after screening.

The bucket shown further comprises a filling opening 6, from which the screened fraction is emptied from the bucket 3. The filling opening 6 is provided with a hatch 7 for closing the outlet between the screening times.

The screening method according to the invention and the corresponding screening device equipped with a vibrator were tested in practice for gravel screening in an extensive research program. According to the research results, the method according to the invention has several significant advantages, especially in the screening of sanding sand, for plant screening, i. compared to screening performed on a screening machine.

Claims (4)

5 -¾¾ 5 8963 A method for screening a solid material, mainly gravel, in which the material to be screened is taken by inserting a bucket (3) with a screen (2) connected to the machine (1) and the bucket is moved to screen the material, characterized in that the screening is performed at a distance from the bottom (3). 5) by means of a sieve (2) placed on the inside of the bucket so that the fine fraction passes through the sieve into the bucket while the coarse fraction remains on the sieve to be poured out into the bucket-like space formed by the bucket edges (4) and the top of the sieve; through the outlet (6). Apparatus for carrying out the method according to claim 1, comprising a stitching bucket (3) with a screen (2) to be connected to the working machine (1), comprising side edges (4) and a base (5), characterized in that the screen (2) is attached to the bucket ( 3) and placed inside the bucket at a distance from the bottom (5) of the bucket on top of the bucket interior (9) so that the bucket edges (4) and the top of the screen form a bucket-like space and the bucket includes an outlet (6); like gravel, the fine fraction passes through a sieve entering the bucket and can be removed through the outlet and the coarse fraction remains in the bucket-like space formed on top of the bucket and can be removed by pouring. club. Device according to Claim 2, characterized in that the bucket (3) has two or more screens (2) arranged one on top of the other at a distance from one another. Device according to Claims 2 or 3, characterized in that the bucket (3) comprises a locking device (8) for locking the screen (2) to the bucket.