CN102343658A - Melt filter for online circulating screen cleaning of recycled plastics, with large filter screen area and implemented without material interruption - Google Patents

Abstract

The invention relates is a melt filter for the online circulating screen cleaning of recycled plastics, with a large filter screen area and implemented without material interruption. The melt filter comprises a hydraulic oil cylinder, large plungers, a filter body, a filter screen, an annular column-shaped flow channel, an internal flow channel, small plungers and a limit plate frame. The filter provided by the invention has the advantages that: the filtering area in a same unit space can be increased by 4-20 times, and the productivity of a single machine can reach more than 1.5 tons/hour; the filter screen is of a spiral slit, trapezoidal sectional filtration slit and polygonal cylinder structure, and can perform online cleaning and be recycled repeatedly, thereby greatly reducing corresponding consumptions; the filter is provided with pre-filling and discharge channels, a material is not interrupted in a screen cleaning process, the production process is performed uninterruptedly, thereby avoiding the loss of materials; each filter-screen plunger body is driven by only a hydraulic oil cylinder so as to realize the linkage of the large and small plungers, therefore, the structure of the filter is greatly simplified, and numerous functional processes are completed smoothly; and by adopting the parallel arrangement of two (or more than two) plunger bodies, the long-term continuous stable operation of the filtration and production processes can be realized.

Description

Reclaim the clear net of the online circulation of plastics, fracture super large screen area fondant filter not

Technical field

What the present invention relates to is a kind of be used to the reclaim clear net of long-term online circulation of plastics, fondant filter of fracture, super large screen area not.Belong to plastic melt filter technical field.

Background technology

Reclaim plastics or contain the plastics of a large amount of impurity, in plastication and extrusion process, need to realize separating of impurity and plastic melt through the melt filtration device.When higher or output is big at impurity content; Traditional filter is difficult to even can't uses; Its subject matter has: 1) the filter screen work area of conventional filter is little; In the high impurity content operating mode will be blocked very soon; Frequent draping; To influence production efficiency and production capacity greatly, even cause production process to carry out continuously.Along with production capacity increases progressively, this contradiction is more outstanding, so plastics recovery work production efficient and ability scale are difficult to promote; 2) traditional filtering device filter screen is disposable use, and together discarded with the impurity material when after obstruction, changing, the filter screen consuming cost is a not little spending; 3) conventional filter generally adopts multi-layer braided filter screen, and impurity is embedded in the mesh easily, even adopt high binder flushing also to be difficult to remove, is on the increase with inlaying impurity, and effective filtration area constantly descends, and can only short-term recycle back discarded; 4) in the draping operation process; Usually the discharging meeting of die head is interrupted pausing in short-term; Especially after adopting online flushing principle; To form big cavity in the draping body; Die head fracture phenomenon will be more outstanding; Need rebulid line balancing when causing each filter screen washing and cleaning operation, produce a large amount of leftover bits losses.Simultaneously, extruding the fracture phenomenon can cause technological process such as granulation underwater to be difficult to realize.

Summary of the invention

The present invention proposes is a kind of be used to the reclaim clear net of long-term online circulation of plastics, fondant filter of fracture, super large screen area not; Its purpose is intended to overcome the above-mentioned defective of existing in prior technology; Have that high-yield and high-efficiency, filter screen can prolonged and repeatedly recycle, net back production process is not interrupted, only realized characteristics such as numerous process functions with a Driven by Hydraulic Cylinder clearly, thereby realization significantly improves the purpose of plastics recovery efficiency of operation and ability scale.

Technical solution of the present invention: it is characterized in that being provided with in the filter body two or more circular hole and input and output material runners that hold big plunger; Two or more big plungers are and are arranged in parallel; Be installed in the filter body with mode movingly, realize axially toward polyslip but the nationality hydraulic jack drives; Polygon cylinder or face of cylinder body filter screen suit are fixed on huge pillar beyond the Great Wall, and polygon cylinder or face of cylinder screen area are 4-20 times of big plunger sectional area; When filter screen impurity gather make feed pressure be elevated to setting value gradually after, can wash the operation of net decontamination to one of them plunger; Only axially outwards move fast along it, big plunger filter screen part is broken away from filter body with a big plunger of Driven by Hydraulic Cylinder; Meanwhile; Relative motion also takes place between static small plunger and the big plunger that moves; Melt material in the big plunger inner flow passage is gone out to outer extrusion in filter screen fast, and the impurity that accumulates in screen surface is rinsed the disengaging filter screen, realizes online impurity cleaning removal; Described polygon cylinder or cylinder filter screen adopt trapezoid cross section, spiral slit formula structure; The filter screen column diameter is slightly less than the filter body aperture, forms the central column runner; Big plunger offers many group radial flow path hole in the interval corresponding with filter screen, and intersects perforation with the inner flow passage hole of big plunger; Small plunger is installed among the big plunger inner flow passage with mode movingly; When filtering duty, small plunger one end touches with the limiting plate bridge joint that is fixed on filter body; Filter body runner inlet and the outer annulated column runner communications and liaison of filter screen, the filter body runner exit communicates with two big plunger inner flow passages; In the filter body porch, offered small bore pre-filled runner, on the filter body of pre-filled runner diagonal angle far-end, offer the exhaust passage.In big plunger reseting procedure, utilize a small amount of melt material that the cavity that cleans inside and outside the filter screen of back is carried out slow filling and displacement exhaust, accomplish after by the melt material full-filling and reset until reaching all cavitys, avoided the fracture phenomenon.

Advantage of the present invention: 1) adopt polygon cylinder (or face of cylinder) screen pack, at roughly the same sky

Between down; Screen area can reach 4-20 doubly (traditional filter structure only is 0.5-1.3 times) with the ratio of plunger sectional area, that is, the filter area in same unit space can strengthen more than ten times; Mean under the similarity condition that the time interval of clear net operation can corresponding prolongation more than ten times.Make high efficiency plastics recovery operation become possibility, even the high impurity content plastics, the unit production capacity also possibly reach more than the 1.5t/h; 2) through the online mode of washing net of pressurized melt, a large amount of impurity flushings that accumulate in screen surface are removed, after resetting, restart filtration operation, filter screen recycles prolonged and repeated, significantly reduces corresponding consumption; 3) adopt cross section, trapezoidal filter crack, one-piece auger slit filter structure, when filtration operation, plastic melt flows to wide mouthful of direction from trapezoidal slot.Compare with traditional mesh grid, impurity is difficult for being stuck in wherein, has promoted the filter screen cleaning efficiency greatly, and simultaneously tradition braiding net height is about 30% for spiral slit formula filter screen percent opening, means to have bigger effective filtration area; 4) offer small bore pre-filled runner at filter body charging aperture place; Be provided with the exhaust passage at its diagonal angle far-end; Utilize a small amount of pressurized melt material to carry out slow filling and displacement exhaust, accomplish after by the melt material full-filling and reset until reaching all cavitys to cleaning the cavity of back inside and outside the filter screen; This function is cleaned in the reseting procedure at filter screen, and production process can not interrupted fully continuously, has avoided material loss; Make it can be used for hot cut pellet under water etc. simultaneously, expanded range of application the responsive pelletizing mode of pressure flow fluctuation; 5) hydraulic system adopts and to go out the design of replying the position with two-step method slowly soon, that is: when releasing big plunger filter screen, hydraulic cylinder is continuous fast driving, to realize high pressure washing filter screen impurity; When resetting operation, control big plunger and reset to the pre-filled position in advance, after device internal cavities to be filtered is filled, air drained by displacement, continue to reset to the filtration duty again.Steam vent can be provided with hand-operated valve or internally piloted valve; 6) each filter screen plunger body only drives with a hydraulic jack and realizes big small plunger interlock; Collaborative dependency structure and automatic control design; Can take into account simultaneously and realize big plunger and filter screen shifts out, fracture numerous operation process such as reset not after switching, high pressure washing filter screen and the pre-filled exhaust of the relative motion of small plunger, input and output material passage; With respect to other schemes such as the two cylinder systems of each plunger, structure is greatly simplified.Numerous function course are accomplished without any letup, and except that labor cleaning's impurity material, can realize the automation program control operation; 7) adopt two (or more than two) plunger body parallel connection settings, a plunger filter screen is when carrying out the impurity cleaning, and another plunger filter screen is still carrying out filtration operation, the filter screen washing and cleaning operation that can hocket, thus realize that the continous-stable that filters with production process moves.

Description of drawings

Accompanying drawing 1 is a structural representation of the present invention.

Among the figure 1 is hydraulic jack, the 2nd, big plunger, the 3rd, filter body, the 4th, filter screen, the 5th, central column runner, the 6th, inner flow passage, the 7th, small plunger, the 8th, spacing grillage.

The specific embodiment

Contrast accompanying drawing 1, its structure are to comprise hydraulic jack 1, big plunger 2, filter body 3, filter screen 4, central column runner 5, inner flow passage 6, small plunger 7, spacing grillage 8; Wherein be provided with two or more circular hole and input and output material runners that hold big plunger 2 in the filter body 3; Two or more big plungers are and are arranged in parallel; Be installed in the filter body with mode movingly, realize axially toward polyslip but nationality hydraulic jack 1 drives; Polygon cylinder body or face of cylinder body filter screen 4 suits are fixed on the big plunger 2; Polygon cylinder or face of cylinder screen area are 4-20 times of big plunger sectional area; Big plunger offers many group radial flow path hole in the interval corresponding with filter screen, and intersects perforation with the coaxial inner flow passage of big plunger; Small plunger 7 is installed among the big plunger inner flow passage 6 with mode movingly; When filtering duty, small plunger exposes the end and contacts with the spacing grillage 8 that is fixed on filter body; Filter body runner inlet communicates with big plunger inner flow passage with the outer annulated column runner communications and liaison of filter screen, filter body runner exit; In the filter body porch, offered small bore pre-filled runner, on the filter body of pre-filled runner diagonal angle far-end, offer the exhaust passage.

Described polygon cylinder body filter screen adopts trapezoid cross section, spiral slit formula structure, and the filter screen diameter is slightly less than the filter body aperture, forms central column runner 5.

When normal filtration was worked, plastic melt inherent filtration device body inlet got into filter outer shroud column runner, and the clean materials behind strainer filtering gets into big plunger inner flow passage, again by discharging opening outflow filter body; Impurity is filtered off and accumulates in screen surface.

The online flushing of filter screen:, after feed pressure reaches setting value, can utilize pressurized melt to wash the net operation to one of them plunger when filter screen impurity accumulates to critical value; Big plunger of Driven by Hydraulic Cylinder axially outwards moves along it fast, and big plunger filter screen part is broken away from filter body; Meanwhile; Between static small plunger and the big plunger that moves relative motion also takes place, the melt material in the big plunger inner flow passage is gone out to outer extrusion in filter screen fast, the impurity that accumulates in screen surface is rinsed the disengaging filter screen; Realize online impurity cleaning removal, reach the purpose that filter screen upgrades; The impurity material is removed by the labor cleaning.

Big plunger will at first be closed the turnover material channel when mobile, form the cleaning material space of relative closure; Big plunger continues to move, and small plunger will be oppressed inner flow passage material realization high pressure and got the filter screen operation express developed.

Not fracture operation: in the filter body porch, offered small bore pre-filled runner, on the filter body of pre-filled runner diagonal angle far-end, offered the exhaust passage.When resetting, big plunger at first arrives the pre-filled position, and filter import and export this moment sprue still is in closed condition, and only a small amount of material of import department is slowly filled the screen pack external cavity through filling runner in advance, and intracavity gas is overflowed through exhaust outlet simultaneously; After the filter screen external cavity fills up material, continue to fill inner flow passage, and small plunger is pushed to the terminal point operating position; Then, big plunger starts and finally resets, thus the time all flow channel spaces be full of by material, extrusion will can not produce cutout, fracture, significantly improve overall efficiency and yield rate, reduce loss consumption.

Claims (1)

1. be used to reclaim the clear net of long-term online circulation of plastics, the fondant filter of fracture, super large screen area not; It is characterized in that being provided with in the filter body two or more circular hole and input and output material runners that hold big plunger; Two or more big plungers are and are arranged in parallel; Be installed in the filter body with mode movingly, realize axially toward polyslip but the nationality hydraulic jack drives; Polygon cylinder or face of cylinder body filter screen suit are fixed on huge pillar beyond the Great Wall, and polygon cylinder or face of cylinder screen area are 4-20 times of big plunger sectional area; When filter screen impurity gathers, after feed pressure is elevated to higher limit gradually, can utilize pressurized melt to carry out the operation of on-line cleaning decontamination to one of them filter screen, after resetting, filter screen recycles; Only realize the compound interlock of big small plunger with a hydraulic cylinder, that is: the big plunger of hydraulic-driven axially outwards moves along it fast, and big plunger filter screen part is broken away from filter body; Meanwhile, between static small plunger and the big plunger that moves relative motion also takes place, the material in the big plunger inner flow passage is gone out to outer extrusion in filter screen fast, the impurity that accumulates in the filter screen outer surface is rinsed the disengaging filter screen, realizes online Impurity removal; Described polygon cylinder body or cylinder filter screen adopt trapezoid cross section, spiral slit formula structure, and filter screen cylinder diameter is slightly less than the filter body aperture, form the central column runner; Big plunger offers many group radial flow path hole in the interval corresponding with filter screen, and intersects perforation with the inner flow passage hole of big plunger; Small plunger is installed among the big plunger inner flow passage with mode movingly; When filtering duty, small plunger one end touches with the limiting plate bridge joint that is fixed on filter body; Filter body runner inlet communicates with the outer annulated column runner of filter screen, and the filter body runner exit communicates with big plunger inner flow passage; In the filter body porch, offered small bore pre-filled runner, on the filter body of pre-filled runner diagonal angle far-end, offer the exhaust passage.

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