A Push-Pull Hanging Folding Sieve

Abstract

The invention discloses a push-pull hanging and folding screen which is used for dewatering or wet-type screening of ore pulp. The push-pull hanging and folding screen comprises a rack, a plurality of strings of screening units, a push-pull mechanism, a transmission system, a bottom chute and intra-string bottom supporting grooves, the screening units hung on the rack are hollow cavities which are communicated, a movable screening cavity set is arranged vertically in a sectionalized manner, screening nets are arranged on two side faces of screening cavities of the movable screening cavity set, the screening cavities of the movable screening cavity set when being pushed and pulled can be folded in an angle-variable manner, and the transmission system is used to drive each push-pull rod of the push-pull mechanism to be in reciprocating push-pull action to drag the screening cavities positioned at equal-altitude positions of all screening units of a same push-pull rod to be combined together for shaking so as to enable screening faces of the screening cavities to alternate downwards and upwards. Through spatial architecture designing, ore pulp is divided into multiple branches which are parallelly connected to be spread to form ore pulp faces respectively, ore pulp on the screen is continuously connected serially to increase screen permeating times, and an ore pulp layer is turned to improve screen permeating efficiency.

Description

technical field [0001] The invention relates to a screening device, in particular to a push-pull hanging folding screen, which is used for dehydration or wet screening of ore pulp, and belongs to the technical field of mining machinery equipment. Background technique [0002] In the existing screening technology, the fine screen used for pulp dehydration or wet screening is still dominated by vibrating fine screen; in addition, if it is used for desliming or deintermediation of ore pulp, its process requirements are the same as wet screening , are to remove fine particles from the pulp. [0003] When the vibrating fine sieve is used for pulp dehydration, if too thin pulp is fed, water will run out of the screen surface, and most of the water will not get through the screen, so the pulp must be concentrated before feeding; even Feeding the concentrated slurry with a suitable concentration will also cause channel flow on the screen surface due to partial blockage of the scree...

AI Technical Summary

Problems solved by technology

[0003] When the vibrating fine sieve is used for pulp dehydration, if too thin pulp is fed, water will run out of the screen surface, and most of the water will not get through the screen, so the pulp must be concentrated before feeding; even Feeding the concentrated ore pulp with a suitable concentration will also cause channel flow on the screen surface due to partial blockage of the screen and material deposition on the screen surface, resulting in the slurry flowing along the channel and difficult for water to penetrate the screen

[0004] Because of the above-mentioned disadvantages of using vibrating fine screen for dehydration, the dehydration method of concentration and fine screen is only used for the treatment of a small number of iron tailings before dry stacking, and the method of concentration and filtration is still required for dehydration in most occasions

The thickener used for thickening is designed based on the way that the underflow is formed and discharged downwards, and the overflow is basically clear water. Therefore, the soil construction cost of the thickener is relatively high, and it cannot be moved after completion. Even if it is replaced by a small and exquisite rotary The overflow of the cyclone is not thin enough and still needs to be concentrated in the thickener, and because the cyclone needs a higher pressure for the ore nozzle, the energy consumption is relatively high

[0005] For the above-mentioned sieve surface running water and ditching phenomenon, the inventor thinks that this is because it is difficult to control the flow of the pulp on the screen, which is easy to cause "pulp short circuit"; this is like a flotation circuit, in order to avoid "pulp short circuit" ", will not choose a single large-sized flotation machine, but choose several smaller-sized flotation machines to be used in series; and for the vibrating fine screen, if the existing screen machine is just like a flotation circuit Connected in series, not only the flow of the slurry on the screen needs to be adjusted by pumps many times, which increases energy consumption, but also the number of equipment is large, and the site occupied is bound to be large

[0006] When the vibrating fine screen is used for desliming, de-intermediation or wet screening, it is used in the way of thinning the pulp layer and spraying water on the screen. Due to the thin pulp layer, the movement of the pulp on the screen can be reduced, but Limited by the single-direction setting of the screen, it occupies a large area, but the working area is small; even if the added vibration allows the slurry layer to be properly thickened, it is not convenient to make corresponding adjustments due to the movement of the slurry on the screen. Therefore, it is difficult to improve the processing capacity of a single machine; it is not advisable to increase the screen length and screen width for a single-layer vibrating fine screen, because the stress of the vibration-bearing components increases greatly, and the amount of materials increases. Power consumption also increases

[0007] In order to increase the processing capacity of the screen machine and improve the dehydration or screening efficiency of the screen machine, the existing screening technology is realized by forming the screen machine into a space structure. There are two setting methods for this, one is by stacking The other is to set according to the spatial movement to change the movement direction of the slurry on the screen to extend its movement stroke, such as conical screen surface fine screen, spiral screen surface fine screen, spiral Tube screening machine, spiral drum water screen, etc.; the former realizes the parallel connection of the pulp, and the latter realizes the serial connection of the pulp on the screen; among them, limited by the structure, it is difficult for the former to be used in parallel to be connected in series like the latter. In the latter, only some of the spiral fine screens can be laminated to form two-way or three-way parallel feeding; from this point of view, it is difficult for the existing screening technology to have the advantages of the above two.

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