Constant-pressure screw press dehydrator

Abstract

The invention discloses a constant-pressure screw press dehydrator, comprising a screw supported by a rear axle seat and a front on a pedestal, and a filter cylinder which is axially sleeved on the screw, wherein a drive mechanism drives the screw to rotate; the right end of the filter cylinder is upward provided with an open mouth which is communicate with a feed hopper, and the left end of the filter cylinder is downward provided with an open mouth and a discharge port; the feed hopper is provided with an electric feeding mechanism, which is suitable for injecting various kinds of sludge; and sludge is injected uniformly, thus the consistency of the pressing effect is good, and the production efficiency is high; a sliding sleeve assembly is arranged between the rear axle seat cooperated with the screw and the left end plate of the filter cylinder, the sliding sleeve assembly and a stand which backs to the pedestal and is connected with the pedestal form a structure which can rotate with the screw and can conduct axial displacement; the axial thrust generated by the axial displacement structure has an opposite direction with the axial thrust generated by the screw, thus the screw axial thrust can be balanced, the support operation conditions are directly improved, the failure rate is reduced, and the operation cost is saved.

Description

Technical field [0001] The present invention relates to a sludge dewatering machine, in particular, the present invention relates to a screw press dewatering machine. Background technique [0002] The by-product of sewage treatment is wet sludge, and the mainstream equipment for sludge dewatering today is a horizontal screw press. Commercial screw press dehydrators are usually equipped with variable-pitch screws, that is, the screw at the feed port has a large screw pitch, and the screw at the discharge port has a small screw pitch. When the wet sludge is put into the filter cylinder, it is engulfed by the rotating screw. The internal volume of the screw pitch decreases, so that the loaded wet sludge is squeezed and dehydrated. However, the prior art has two major structural defects. First, the double-supported screw inevitably generates an axial thrust when sludge squeezing is performed. The axial thrust is proportional to the sludge squeezing load and consistent with the sludg...

AI Technical Summary

Problems solved by technology

However, there are two major structural defects in the prior art. Firstly, the screw with double support structure will inevitably generate axial thrust when the sludge is squeezed.

Under the action of axial thrust, the screw will inevitably have an axial movement trend, which will form an eccentric load on the supports located at both ends of the screw. Excessive eccentric loads and long-term eccentric loads will inevitably deteriorate the rotation conditions of the support and easily cause damage to the support structure.

Secondly, the gravity feeding is easy to get stuck, especially the wet sludge with a lot of fiber is not fed smoothly, resulting in unstable internal pressure, which leads to the problem of inconsistent pressing effect.

The screw press dehydrator is a kind of large-scale machinery. Due to the above-mentioned structural defects and poor operating environment, it is prone to failure. Frequent maintenance will not only reduce the sludge treatment capacity, but also increase the operating cost.

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