Spiral squeezing type sludge dewatering equipment

Abstract

The invention discloses a screw extrusion type sludge dewatering machine, comprising a machine base (1), a water inlet part, a sludge exit part (41), a water outlet part, a screw shaft (2) with a spiral blade (21), as well as a filter disc assembly composed of a plurality of annular static filter discs (5) and annular dynamic filter discs (6) in a cross-interval arrangement; wherein, each static filter disc (5) is fixed relatively to the machine base (1); the internal diameter of each dynamic filter disc (6) coincides with the external diameter of the blade (21) and has line contact with the blade (21); moreover, the space between two adjacent static filter discs (5) is slightly greater than the thickness of the dynamic filter disc (6) between the two adjacent static filter discs (5) so as to form a gap (7) between the static filter discs (5) and the dynamic filter disc (5); water can flow through the gap (7). Compared with the prior art, the invention enables water to directly flow out through the gaps of the filter disc assembly so as to avoid the abrasion to the static filter discs and the dynamic filter discs caused by sludge; the device has a longer service lifer and adopts only one power source to realize solid-liquid separation, so that the energy consumption is lower; besides, the components of the device are easy to install and simple in structure to facilitate actual implementation.

Description

technical field [0001] The invention relates to a device for solid-liquid separation of sewage and sludge, in particular to a screw extrusion sludge dehydrator. Background technique [0002] Existing devices for solid-liquid separation include vacuum filters, pressurized filters, centrifugal dehydrators, belt filter presses, plate-and-frame filter presses, etc. Due to the use of filter screens, sludge It is easy to stay in the mesh of the filter screen to block the filter screen, reduce the efficiency of solid-liquid separation, and the service life is short, which also brings a lot of trouble to the maintenance work of the device. Therefore, a new screw extrusion sludge dewatering machine is invented, such as the Chinese invention patent "Laminated Screw Dewatering Machine" whose patent number is ZL98124476. . The laminated screw dehydrator includes a shell, a screw shaft inside the shell, blades driven by the screw shaft and a sliding filter group arranged in the center ...

AI Technical Summary

Problems solved by technology

[0003] This technical solution has the following defects: First, in the technical solution disclosed by this patent, the sludge passes through the gap between the static filter and the dynamic filter in the sliding filter group, which will easily block the static filter and the dynamic filter. The gap between the sheets, and the sludge itself is some particles and impurities, which will constantly rub against the surfaces of the static filter and the moving filter in reverse, causing serious wear and directly reducing the service life of the device. Therefore, this This dehydration method, in which the sludge is discharged from the periphery and the water is discharged from the center, is not scientific and reasonable enough and needs to be improved; secondly, the blades in the spiral discharge mechanism are driven to rotate by the screw frame fixed together with it, and the static in the sliding filter group The filter is fixed on the spiral frame and rotates with it, while the moving filter in the sliding filter group is moved relatively by the driving arm welded with the central shaft, at the same time, the rotation of the static filter and the moving filter The direction is opposite, that is, the screw rack and the central axis in the screw discharge mechanism must rotate in the opposite direction, which means that the device needs two power sources with opposite rotation directions, and the sludge between the static filter and the dynamic filter gap It will increase the friction between the two. To make the rotation direction of the static filter and the moving filter opposite, the energy consumption required is very large, and it is necessary to drive two concentric devices to rotate in reverse, and the structure of the device becomes very It is complicated and not conducive to implementation; thirdly, the distance between two adjacent static filters is very particular. If it is too small, the sludge will not pass through smoothly, which will affect the concentration of the sludge. If it is too large, the water will flow to the outlet together with the sludge , reduce the overall dehydration effect, and in this patented technology, the size of the gap between the static filter and the static filter and the dynamic filter is adjusted by adjusting the tightness of the pressure plates at both ends of the sliding filter group. However, the static filter is fixed on the spiral frame, and the entire sliding filter group needs to go through the central axis to be several meters long. This simple method relies on the extrusion of both ends to adjust the distance between the static filter and the dynamic filter. It is very difficult to adjust the gap between them. The adjustment effect is negligible, and it is easy to cause some gaps to be wide and some gaps to be narrow, or even no gaps, which will affect the passage of sludge, which will cause low work efficiency and greatly increase energy consumption. ; Fourth, in this device, the water inlet is set on the lower part of the shell, and the mud outlet is set on the upper part of the shell. The sewage with sludge needs to be pumped into the shell, and the sludge with a certain amount It is also difficult to discharge from the upward mud outlet, and the design is not reasonable enough

Images