Crawler blotter press

Abstract

The present invention discloses one kind of crawler type pressure filter for pressure filtering industrial effluent, paper pulp, domestic sludge, oil bearing sludge and other suspension or solid-liquid mixture. The crawler type pressure filter consists of one frame, one driving mechanism, one feeding mechanism, one squeezing area and one auxiliary device mainly. The squeezing area on the frame includes one squeezing roll, one pressurizing belt and one filtering belt. Structurally, the crawler type pressure filter features that the squeezing area includes also one crawler type tension belt winding outside the squeezing roll parallelly via superposing with the pressurizing belt and the filtering belt. The present invention is superior to available technology, can realize 3D shearing and squeezing dewatering of the filter cake, and possesses the advantages of high dewatering effect, long service life of the filtering belt, etc.

Description

technical field [0001] The invention relates to a belt-type filter press, especially a crawler-type filter press specially used for solid-liquid separation of various organic and inorganic microparticle suspensions or solid-liquid mixtures such as industrial waste water, pulp, domestic sludge, oily sludge, etc. filter press. Background technique [0002] Water treatment plants, paper mills, food processing plants, chemical plants and farms all produce a large amount of materials that need to be dehydrated. These materials are dehydrated, concentrated and then landfilled, which can save a lot of land and reduce sewage infiltration; at the same time, when many of these materials are concentrated to a certain solid content, they can be directly used for comprehensive utilization, thereby saving drying. energy. [0003] As a solid-liquid separation equipment in the dehydration treatment of materials to be dehydrated, the belt filter press is very mature. The belt filter press ...

AI Technical Summary

Problems solved by technology

[0004] The belt filter presses of the above-mentioned prior art have one thing in common, that is, the filter cake, the filter screen or the filter belt and the pressurized belt make a serpentine movement along the outer diameter arc of the press roller as a whole, and the filter cake moves along the traveling direction due to the angular velocity Shearing is caused by poor flow, but there is not enough shearing in the direction perpendicular to the direction of travel; at the same time, the sudden change in pressure in the vertical direction will cause obstacles to the operation of the filter cake, such as sludge retreat, mud leakage at both ends, etc., so now The common design principle of all equipment is to ensure smooth and gradual pressurization to ensure smooth operation of the filter cake, and to achieve longitudinal filter cake shear through angular velocity difference to achieve press dehydration

This structure has the following limitations: 1. When the filter cake moves around a certain press roll, the filter cake is only subject to longitudinal shear caused by the difference between the inner and outer diameters of the rotation during the circular arc snake movement, and there is no transverse and vertical shear. Cutting, and the inside of the filter cake is subjected to balanced pressure and balanced longitudinal shear force. There is no local force difference. Under the condition of high solid content filter cake, sufficient extrusion cannot be produced, which is not conducive to dehydration, and is easy to clogging the filter

2. In the thickness direction of the filter cake, the position of the particles inside the filter cake is relatively unchanged. For example, the filter cake particles in the middle layer are always in the middle, and there is no chance to move to the vicinity of the filter screen. The adsorbed liquid must rely on The pressure can only be removed after overcoming the resistance of the filter cake between its position and the filter screen, which requires a large power consumption and a long time, that is, it needs to increase the pressure and reduce the speed of the vehicle

3. Under high tension conditions, such as 100 kg / cm, a large longitudinal shear will cause the wear of the filter belt to accelerate. When the solid content of the filter cake is high, such as the solid content of paper deinking sludge exceeds 25%, the filter belt The wear is more serious, and the life span is only 15-30 days, so the traditional belt filter press is not suitable for operation under the conditions of high tension and high solid content of filter cake

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