RU2253718C2 - Apparatus for mechanical sewage treatment - Google Patents

Abstract

FIELD: water treatment equipment, particularly for separating mechanical impurities from domestic and industrial sewage.

SUBSTANCE: apparatus comprises body rested upon support, grid adapted to perform continuous movement and formed as closed continuous chain with trapping hooks. Hooks are secured on rods forming grid web located on upper driving drum shaft and lower support drum shaft. Apparatus also has electric drive with rotary drive unit, grid cleaning device made as a bush of flexible bars and connected with above unit, as well as conveyer or special pack. Trapping hooks formed of sheet steel are secured to rods with two plastic bushes. Hook and bushes are connected one to another by pouring plastic material over hook along with bushes forming or hook is mechanically connected to bush so that hook and bushes are restrained from mutual rotation. Grid web and upper drum shaft are attached through star members installed on upper drum shaft and uniformly distributed through grid width. Body is provided with support plates located parallel to grid movement path and adapted for grid supporting. Apparatus also has drive for grid web movement speed regulation. Drive is made as electric drive having electric current frequency converter and level sensor to determine water level upstream and downstream the grid.

EFFECT: increased reliability, efficiency and service life.

3 cl, 4 dwg

Description

The invention relates to the field of wastewater treatment, and in particular to devices for the detention and removal of mechanical impurities from the waters entering the sewage treatment plant.

Known devices for the retention and removal of mechanical impurities from wastewater, containing a housing, a grate made of rods and installed in the wastewater channel, a grate cleaning device in the form of a rake connected to a drive by articulated plate chains (S.V. Yakovlev, Y. A. Karelin et al. Sewerage. M., Stroyizdat, 1975, p. 632).

A unit for mechanical wastewater treatment is also known, comprising a housing located on supports, installed in it with the possibility of continuous movement of the grate, made in the form of a closed continuous chain with catch hooks fixed to the rods, of which a grating web mounted on upper driving and lower supporting shafts-drums, an electric motor with a rotation drive assembly, a grill cleaning device made in the form of a brush of flexible rods connected to the designated unit, and the conveyor or special packaging (RF PM No. 15110, E 03 F 5/14, 09/20/2000). This technical solution is the closest technical solution to the proposed, however, it has several disadvantages.

The traction chains carrying the grate are supported by guides placed on both sides of the grate and representing a bent metal profile that limits the grate from lateral displacement and fixes the necessary trajectory of the grating. When the lattice moves between the elements of the traction chain and the guides, significant friction forces arise, especially in places of significant kink of the branches of the lattice, in particular when the direction of movement is reversed in the lower branch.

This is compounded by the fact that the presence of abrasive in the form of suspended sand in the purified water causes the traction chain rollers to jam, which changes the rolling friction of the roller on the axis to the sliding friction of non-rotating rollers along the guides, which under these conditions sharply increases the forces acting in the traction chains . The presence of abrasive in the wastewater also causes intense wear of these guides and elements of the traction chain.

All this leads to a significant increase in the loads acting in the mechanism, and accordingly the energy costs for the drive of the grate, increased wear, reduced reliability and durability of the unit.

In addition, in the known aggregate, the lattice rods with the catch hooks placed on them are loaded during operation by forces acting both from the mass of the catch hooks with impurities detained on them, and from the flow of purified water running onto the grid. The combined effect of these forces leads to significant deformation of the rods and, as a consequence, to a disruption in the normal operation of the rods and elements of the traction chain, their accelerated wear and subsequent failure.

The manufacture of plastic hooks due to the presence of abrasive particles leads to fragility and, accordingly, to the wear of the rod itself.

The drive, providing continuous movement of the grill, also leads to premature wear of the units.

An object of the invention is to increase the efficiency, reliability and durability of the unit.

The technical result is achieved by the fact that in the unit for mechanical wastewater treatment, containing a housing located on the supports, installed in it with the possibility of continuous movement of the grill, made in the form of a closed continuous circuit with catch hooks fixed to the rods, of which the formation of gaps is made a grill blade mounted on the upper driving and lower supporting rolls-drums, an electric motor with a rotation drive assembly, a grill cleaning device made in the form of a brush made of Low rods connected to the specified node, and the conveyor or special equipment, the hooks are made of sheet steel, are placed on the rods using two plastic bushings, and the hook and bushings are joined by pouring the hook with plastic to form the bushings or mechanically fixing the hook and bushes from relative rotation, the specified canvas and the upper shaft of the drum are connected by sprockets mounted on the upper shaft of the drum and placed evenly across the width of the lattice. The housing is equipped with support plates arranged parallel to the movement of the grating with the possibility of supporting the gratings on them. The unit is equipped with a drive for controlling the speed of movement of the lattice web, made in the form of an electric motor with an electric current frequency converter and water level sensors before and after the lattice.

Thus, the design of the unit ensures uniform movement of the grate over the entire width and, accordingly, the distribution of the total load on both the rods and the catch hooks. The absence of distortions of the catch hooks relative to the rods ensures normal working conditions, reduces wear and increases the reliability of the device.

The execution of the hook combined in the form of sheet steel and plastic bushings ensures its strength and rigidity, and also makes it possible to obtain arbitrarily small clearances. The connection of the hook with plastic sleeves eliminates the wear of this coupling during operation.

The presence of an adjustable drive of the lattice web reduces the energy consumption for the drive of the lattice, reduces the wear of all interfaces of the mechanism, increases reliability and durability.

The invention is illustrated by drawings, where Fig. 1 shows a general view of the device, in Fig. 2 a section along A - A, in Fig. 3 - a section along B - B, in Fig. 4 - a section along B - C.

The unit comprises a housing 1 in the form of a rigid frame welded from long products and having supports 2. In the housing 1, shafts-drums 3 and 4 are installed - a drive and a driven shaft, respectively, the drive shaft-drum 3 is connected to the electric motor 5, and the driven shaft-drum 4 is placed on the axes of the housing 1. On the shafts-drums 3 and 4 there is a lattice web 6, consisting of rods 7 with catch hooks 8 mounted on them and forming lattice clearances. In the upper part of the housing 1 there is a device for cleaning the filter cloth from delayed waste, including a brush 9 of flexible elastic rods connected to the drive 10 by means of a coupling. The device is closed by a hood 11 with an opening in the lower part to discharge the trapped impurities removed by a brush 9.

The device operates as follows.

The housing 1 of the unit is installed using supports 2 on the concrete sides of the wastewater channel, while the lower part of the grate 6 is located in the wastewater stream. Mechanical impurities are delayed by the grating blade and, when moving, they are moved to the upper part of the housing 1 into the cleaning zone, where by means of a rotating brush 9 the trapped impurities are removed from the catch hooks 8 and dumped either into a special container or onto a conveyor (conveyor) for further processing. The speed of the grating is regulated by water level sensors in the channel, with an increase in the level difference, the speed increases, with a decrease - decreases.

Claims (3)

1. The unit for mechanical wastewater treatment, comprising a housing located on the supports, installed in it with the possibility of continuous movement of the grate, made in the form of a closed continuous circuit with catch hooks fixed to the rods, of which a grating web mounted on upper driving and lower supporting shaft-drums, an electric motor with a rotation drive assembly, a grill cleaning device made in the form of a brush of flexible rods connected to the indicated assembly and a conveyor or special product, characterized in that the catch hooks are made of sheet steel, are placed on the rods using two plastic bushings, and the hook and bushings are connected by filling the hook with plastic to form the bushings or mechanically fixing the hook and bushings from relative rotation, the specified canvas and the upper shaft of the drum are connected by asterisks mounted on the upper shaft of the drum and placed evenly across the width of the lattice. 2. The assembly according to claim 1, characterized in that the housing is provided with support plates arranged parallel to the movement of the lattice with the possibility of supporting the lattice against them. 3. The unit according to claim 1 or 2, characterized in that it is equipped with a drive for controlling the speed of movement of the grating web, made in the form of an electric motor with an electric current frequency converter and water level sensors before and after the grate.

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