RU2261137C1 - Device for cleaning filtering cloth from contaminants - Google Patents

Abstract

FIELD: cleaning waste water; units and mechanisms for cleaning filtering cloth from contaminants.

SUBSTANCE: proposed device includes filtering rods and strips supporting them which consist of several bars with combs. Combs have teeth of different height; combs are mounted on bars in alternating position relative to height of teeth. Each comb is provided with elastic flow reflector made in form of strip secured on lateral side of comb at similar distance from cutting edges of teeth.

EFFECT: enhanced efficiency and reliability of cleaning filtering cloth; reduced wear of comb teeth.

8 cl, 6 dwg

Description

The invention relates to the field of wastewater and sludge treatment, in particular to devices and mechanisms for cleaning the filter cloth from contaminants (litter, debris, garbage, etc.) of mechanized screens for wastewater and sludge treatment.

Known rake (price list of NPF "Ecoton", Russia, Belgorod) for cleaning the filter cloth from pollution, made in the form of combs fixed to two traction chains with teeth that clean the gaps between the rods of the filter cloth and transporting the pollution to the discharge area of the mechanized grate .

The disadvantages of the known rake are the unreliability and inefficiency of cleaning it with a filter cloth from contamination due to its low stiffness in the direction of movement and intensive wear of the teeth of the comb, due to wear and exhaust traction chains

In addition, due to the low stiffness in the direction of movement, the rake has a limited scope - only for mechanized grids with a small width of the filter cloth (up to ~ 1000 mm).

Known rake (utility model, application No. 2003112302, positive decision dated 05/28/03) for cleaning the filter cloth from contamination, made in the form of a beam from a rectangular pipe, at both ends of which fists are fixed with grooves in contact with the rectangular guides of the filter cloth. The rectangular tube of the beam is parallel to the filter web with long sides, on which stiffeners are rigidly fixed. By means of fists and brackets, the rake is mounted on two traction chains. The beam is equipped with a comb with teeth that clean the gaps between the rods of the filter cloth and transporting contaminants to the unloading area of the mechanized grill. The comb is mounted on the beam with the possibility of adjustment movement in the direction of the filter cloth.

The efficiency and reliability of cleaning the filter cloth with this rake in comparison with the above is significantly higher due to the rake in the form of a beam from a rectangular pipe with stiffeners, which significantly increased its stiffness in the direction of movement and expanded the scope, as well as due to the presence of adjustment movement combs, compensating for wear of its teeth and wear and exhaust chains.

In addition, the additional orientation of the rake relative to the clearance of the filter cloth with the help of fists and rectangular guides reduced the wear of the teeth of the comb.

The disadvantages of this rake are the lack of reliability and efficiency of cleaning it with a filter cloth in the presence of large-sized objects (canisters, polyethylene cylinders, beer cans, etc.) in the waste fluid or sludge that the rake does not remove from the waste fluid, and fibrous inclusions of textile origin ( thread, pile, rags, etc.), which, wrapping and weaving around the rake, prevent the teeth of the comb from entering the gaps of the filter cloth and clean them, as well as due to wear (rounding uschih edges) of the comb teeth, caused by the lack of them cutting corners.

In addition, due to the lack of compensation for fluctuations in the ejection of the rods over the supporting jumpers that occurs during the manufacture of the filter cloth due to the leash caused by the fastening of the rods in the jumpers, plexings of fibrous inclusions are formed on them, which leads to clogging of the filter cloth.

The purpose of the invention is to increase the reliability and efficiency of cleaning the filter cloth from litter, debris, bulky objects and fibrous inclusions and reduce wear of the teeth of the comb.

This goal is achieved by the fact that each comb is equipped with an elastic flow reflector made in the form of a strip, which is mounted on the side of the comb equidistant from the cutting edges of the teeth and assembled with a comb is a scraper for removing large-sized objects from the waste fluid, and the combs are made with different the height of the teeth and mounted on the rake separately with alternating relative to each other.

The combs used to clean the filter rods have a height of the teeth of the comb N = h-0.5 ... 1.0 mm, and the combs used to clean the lintels have a tooth height of H ₁ = h + 2.5 ... 5 , 0 mm, where

H and H ₁ - the height of the teeth of the combs;

h - the departure of the rods above the jumpers of the filter cloth.

In addition, the strip has a thickness of 10 ... 20 mm, a length equal to the length of the comb, and a width of 90 ... 120 mm, and the stripe over the end of the comb, located opposite the teeth, is 70 ... 100 mm .

The flow deflector is made of rubber or polymer.

The teeth of the comb are provided with front and rear angles equal to 7 ° ... 15 °, and a dividing groove 2 ... 4 mm wide and 4 ... 6 mm deep, and the bottom of the tooth cavities is backed at an angle of 3 ° ... 5 ° .

A chamfer 1 ... 3 mm wide is made on the posterior faces of the teeth of the comb, and transitional cutting edges 3 ... 6 mm long at an angle of 30 ° ... 45 ° are made on the lateral faces of the teeth.

Using the proposed device allowed to increase the reliability and efficiency of cleaning the filter cloth from contaminants and fibrous inclusions by supplying the combs with a flow reflector in the form of a rubber strip and making combs with different tooth heights for separate cleaning of the rods and jumpers of the filter cloth with different combs, which excluded the wrapping and weaving of fibrous inclusions of textile origin around the rake and leremochki and provided unhindered entry of the teeth of the combs into the clearances of the filter cloth and the reliable cleaning of its rods and jumpers.

The presence of a scraper formed by a flow reflector and a comb allowed removing large-sized objects from the waste fluid.

In addition, the implementation of the front and rear corners and transition cutting edges on the teeth of the comb on the lateral edges of the teeth, as well as the backing of the bottom of the tooth cavities, reduced tooth wear and increased comb life.

The presence of a chamfer on the posterior faces of the teeth of the comb provided multiple tooth regrinding, i.e. increased comb service life.

Separate cleaning of contaminants of the heads of the rods with combs with a tooth height shorter than the rods above the lintels of the filter cloth and lintels with combs with a tooth height greater than the specified offset, as well as the installation of combs on tines with alternation relative to each other, increased the reliability and efficiency of cleaning the filter cloth.

The invention is illustrated by drawings, where in Fig.1 shows a General view of the device; figure 2 is a section aa in figure 1; figure 3 is a view of B in figure 2; figure 4 is a section bb in figure 3; figure 5 is a view of I (an embodiment of a flow reflector) in figure 2; in Fig.6 is a view II in Fig.1.

The device comprises a rake 1 (Fig. 1), a beam 2 (Fig. 2), two fists 3 (Fig. 1), a comb 4 and an elastic flow reflector 5.

The beam 2 (figure 2) is made in the form of a rectangular pipe 6 with stiffeners 7.

Fists 3 (Fig. 1) are provided with a rectangular groove 8 and are welded to the ends of the beam 2.

The comb 4 has teeth 9 and is mounted on the beam 2 with the possibility of adjustment movement in the direction of the filter cloth 10.

The teeth 9 (figure 4) have a cutting edge 11 and are equipped with front γ and rear α angles equal to 7 ° ... 15 °. The bottom 12 of the tooth cavities is backed up at an angle β equal to 3 ° ... 5 °, and has a radius cutting edge 13.

On the rear faces 14 of each tooth 9, a chamfer 15 is made with a width of 1 ... 3 mm, and on the side faces 16 (Fig. 3), transition cutting edges 17 are 3 ... 6 mm long at an angle φ equal to 30 ° ... 45 °.

On each tooth 9 symmetrically to its lateral faces 16, a dividing groove 18 is made with a width of 2 ... 4 mm and a depth of 4 ... 6 mm.

The height of the tooth 9 comb 4 has two versions. In one design (Fig. 3), the height of all the teeth 9 of the comb 4 is made equal to the value expressed by the dependence: H = h-0.5 ... 1.0 mm, and in another design (Fig. 6) - H ₁ = h +2.5 ... 5.0 mm, where

H and H ₁ - the height of the teeth of the combs;

h - the departure of the rods 19 over the jumpers 20 of the filter cloth 10.

Combs 4 of different designs along the height of the teeth 9 are mounted on different tines 1 separately with alternating relative to each other.

The flow reflector 5 is made in the form of a strip, which has a thickness equal to 10 ... 20 mm, a length equal to the length of the comb 4, and a width equal to 90 ... 120 mm. The departure of the strip above the end face 21 (Fig. 2) of the comb 4 is 70 ... 100 mm.

The flow reflector 5 can be made prefabricated from two identical strips (Fig. 5), depending on the medium being filtered — sediment or liquid and their properties.

The flow reflector 5 with a strap 22 (FIG. 2) and screws 23 is fixed on the side 24 of the comb 4 equidistant from the cutting edges 11 of the teeth 9.

The elastic reflector of the stream 5 is made, for example, of rubber or elastic polymer.

The flow reflector 5 assembly with comb 4 is a scraper 25 to remove large items from the waste fluid.

Grablin 1 (figure 1) through fists 3 and brackets 26 mounted on traction chains 27.

The device operates as follows.

Moving along the idle section (not shown) of the mechanized lattice, traction 27 transfer the rake 1 to the stream of wastewater or sludge.

With further movement of the traction chains 27, the rake 1 is transferred to the area of the filter cloth 10, where the fists 3, in contact with the rectangular grooves 8 with the guides 28 (Fig. 1), orient the teeth 9 of the combs 4 relative to the openings 29 (Fig. 1) between the rods 19 of the filter cloth 10.

Moving further, the rake 1 with the teeth 9 of the comb 4 cleans the spaces 29 between the rods 19 of the filter cloth 10 from litter, debris and fiber inclusions and transports them along the tray (not shown) to the unloading area of the mechanized grill.

At the same time, rake 1 from the area of the filter cloth 10 with a scraper 25 removes bulky items from the waste fluid and transports them to the unloading area of the mechanized grate.

In the process of cleaning the openings, 29 teeth 9 with cutting edges 11, 13 and 17 and a dividing groove 18 cut or tear fibrous inclusions, and the elastic reflector of the flow 5, oscillating (vibrating), prevents the formation of wraps and weaves around the rake 1 and facilitates their descent from the rake 1.

When cleaning the filter cloth 10 of the comb 4, having a tooth height 9 less than the protrusion of the rods 19 above the jumpers 20, the radial cutting edges 13 rests on the heads of the rods 19 and cleans them and the gaps 29 with teeth 9 from dirt, and the comb 4 having the height of the teeth 9 is greater than the specified the departure of the rods 19, the cutting edges 11 with a dividing groove 18 cleans the jumpers 20 and the gaps 29 with the teeth 9.

Then the rake 1 is again transferred to the blank area, and the cycle of work is repeated.

Claims (8)

1. A device for cleaning from contamination of the filter cloth with filter rods and supporting jumpers, containing several tines, each of which is equipped with a comb with teeth, characterized in that each comb is equipped with an elastic flow reflector made in the form of a strip, which is fixed on the side the combs equidistant from the cutting edges of the teeth and assembled with a comb is a scraper for removing large objects from the waste fluid, and the combs are made with different the height of the teeth and mounted on the rake separately with alternation relative to each other. 2. The device according to claim 1, characterized in that the combs used to clean the filter rods have a tooth height H = h-0.5 ... 1.0 mm, and the combs used to clean the jumpers have a tooth height H ₁ = h + 2.5 ... 5.0 mm, where H and H ₁ - the height of the teeth of the combs; h - the departure of the rods above the jumpers of the filter cloth. 3. The device according to claim 1, characterized in that the strip has a thickness of 10 ... 20 mm, a length equal to the length of the comb, and a width of 90 ... 120 mm, and the stripe over the end of the comb, located opposite the teeth, is 70 ... 100 mm. 4. The device according to claims 1 and 3, characterized in that the flow reflector is made, for example, of rubber or elastic polymer. 5. The device according to claims 1 and 2, characterized in that the teeth of each comb have front and rear angles equal to 7 ... 15 °, and the bottom of the tooth cavities is occluded at an angle of 3 ... 5 °. 6. The device according to claims 1 and 2, characterized in that on the posterior faces of each tooth of the comb a chamfer is made with a width of 1 ... 3 mm. 7. The device according to claims 1 and 2, characterized in that on the lateral faces of the teeth there are transition cutting edges 3 ... 6 mm long at an angle of 30 ... 45 °. 8. The device according to claims 1 and 2, characterized in that on each tooth of the comb, a dividing groove 2 ... 4 mm wide and 4 ... 6 mm deep is made symmetrically to its lateral faces.

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