CN202507513U

CN202507513U - Plastic extruder with intermediate filter

Info

Publication number: CN202507513U
Application number: CN2012200962879U
Authority: CN
Inventors: 陈崇锡; 黄美昌; 周传对
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-03-05
Filing date: 2012-03-05
Publication date: 2012-10-31
Anticipated expiration: 2022-03-05

Abstract

The utility model discloses a plastic extruder with an intermediate filter. The extruder comprises a hollow material barrel. A screw rod matched with the material barrel and being rotatable relative to the material barrel is arranged in the material barrel, one end of the screw rod is connected with a driving device, the material barrel is respectively provided with a feeding hopper and a mould head used for forming a discharged material, the material barrel is provided with an extruding cavity and a filtering cavity, the feeding hopper is communicated with the extruding cavity, the mould head is communicated with the filtering cavity, filtering devices with the number of N are arranged on the outer side of the material barrel, N is an integer equal and larger than 1, the extruding cavity and the filtering cavity are communicated through the filtering device, and when N is equal and larger than 2, the filtering devices with the number of N are connected in parallel. The plastic extruder with the intermediate filter has the advantages that due to the fact that more than two filtering devices are arranged for filtering in alternating mode, the plastic extruder can continuously work, thus, large amount of raw material waste caused by frequent starting of the driving device and frequent adjusting of the plastic extruder can be avoided. Cost is saved, energy consumption is reduced, labor productivity is improved, and service life of equipment is prolonged.

Description

The plastic extruder that has intermediate filter

Technical field

The utility model relates to a kind of plastics machinery, relates in particular to a kind of plastic extruder that has intermediate filter that can the long-time continuous operation.

Background technology

At present, plastic products manufacturing enterprise owing to can be mixed with small amount of impurities inevitably in the raw material, usually can need frequent shutdown to come cleaning filter net because these impurity stop up the screen pack of plastic extruder when producing plastic products.In this shutdown, cooling, dismounting, cleaning, install, heat, in a series of processes such as die trial; Not only waste a large amount of activity durations and passed through the raw material of heating, pushing; Reduce labor productivity, improved energy consumption, significantly increased the manufacturing cost of plastic products; And bring the hard work amount to the operating personnel, increase operating personnel's labour intensity.When particularly utilizing the waste or used plastics that reclaims to repeat to utilize, the blocked phenomenon of screen pack is even more serious again.

For overcoming above-mentioned defective, Patent Office of the People's Republic of China discloses a CN101786321A patent application on July 28th, 2010, and this name of patent application is " die head of plastic extruding machine "; The described a kind of die head of plastic extruding machine of patent; Include a plurality of filter cores, in each filter core, be inserted with bolt, the chassis; Bolt comprises that hollow structure and bottom are provided with the spiral shell rod of opening; One end of spiral shell rod is provided with nut, and this nut is set up at said filter core top end, on spiral shell rod surface, is laid with a plurality of through holes that communicate with spiral shell rod inside; Filter core comprises inner filter screen and outer filter at least, respectively along vertical edge of said inner filter screen and outer filter successively both forward and reverse directions be folded to form the cylinder leaching net structure of accordion; Said outer filter is coated on the surface of said inner filter screen; The lower edge is shunk and to be connected and to form the upper and lower opening end on the level of said inner filter screen and outer filter; Said chassis is provided with and the identical installing hole of said filter core quantity, and the openend of said spiral shell rod is connected with said installing hole.This patent of invention is utilized in 19 filters is set on the die head, and each filter surrounds with 3 layers of screen pack socket, utilizes filter to filter in turn, thereby prolongs the time interval that filter is unpicked and washed.Because this patent adopts 3 layers of screen pack stack to process filter, has increased filtration resistance, consumed energy meaninglessly; Because the intermediate filtered net is blocked by inside and outside screen pack, be difficult to cleaning, when middle screen pack is blocked again; Filter can only be done discarded the processing, causes waste.And this invention just prolongs the time interval of cleaning and filtering through the quantity that increases filter, can not fundamentally solve plastic extruder and shut down the defective of unpicking and washing screen pack.

Summary of the invention

For overcoming plastic extruder in the defective described in the background technology, the utility model provides a kind of can not shut down the plastic extruder that has intermediate filter that carries out the filtering net cleaning operation.

The utility model solves the in-problem technical scheme of prior art: a kind of plastic extruder that has intermediate filter, comprise the barrel of hollow, and be provided with screw rod rotatable and that match with barrel in the barrel with respect to barrel; One end and the drive unit of screw rod link, and are respectively equipped with feed hopper on the barrel and the die head of the discharging that is used to be shaped, and said barrel is provided with extrusion chamber and filter back cavity; Feed hopper communicates with extrusion chamber, and die head communicates with the filter back cavity, and the barrel outside is provided with N filter; N is >=1 integer; Extrusion chamber is connected through filter between the back cavity with filter, when N >=2, and N filter parallel connection.Barrel is divided into the method that middle part that the scheme of extrusion chamber and filter back cavity both can be employed in barrel and screw rod is provided with sealing ring; Also can adopt the method for double cartridge, twin-screw; As preferably, at the middle part of screw rod inferior screw thread opposite with the screw rod main thread hand of spiral is set, the barrel of hollow is divided into extrusion chamber and filters back cavity; Make that the extrusion chamber of plastic extruder can a shared screw rod with the filter back cavity; So only need a drive unit of configuration and a barrel to satisfy the demand, the non-expection of raw materials for plastics production that can stop again simultaneously in the extrusion chamber gets into the filter back cavity, thereby guarantees the quality of plastic products; In the barrel arranged outside N filter arranged, when N is 2 or 2 above integers, N filter parallel connection; On the connecting pipe between filter and the extrusion chamber, stop valve is set so in case of necessity, just can be so that N filter can take turns the plastics of filtering molten state, when a filter job; Other filter can quit work through cutting out stop valve, and carries out the cleaning of screen pack, thereby guarantees that plastic extruder can continuous firing; To raise labour productivity; Reduce the waste of raw materials for plastics production, cut down the consumption of energy, practice thrift cost; Because filter is arranged on the barrel outside, the workload that when cleaning filter net, can remove operating personnel's dismounting plastic extruder from, thus reduce operating personnel's labour intensity; Because plastic extruder configuration two sets filtering device is worked by turns and can be satisfied the not needs of downtime screen pack, so the best value of N is 2; In addition, filter and filter can be adopted closed communication between the back cavity, and on the pipeline of closed communication, add vacuum-pumping tube and be connected with vaccum-pumping equipment, be used for plastics heat, steam that extrusion process produces and the discharge of air; Filter also can adopt open type to be communicated with filter between the back cavity; Barrel is provided with receiving hopper above the filter back cavity; The discharging mouth of pipe of filter is positioned at the top of receiving hopper, and steam that plastics produce in heating, extrusion process and air overflow in atmosphere when getting into receiving hopper; Steam and air that plastics produce in heating, extrusion process are separated out smoothly, can improve the quality of plastic products.

As the optimal selection scheme, said filter comprises the filter of hollow, is provided with first filtering bodies in the cavity in the filter, and first filtering bodies is divided into chamber one and chamber disome with cavity, and the chamber one communicates with extrusion chamber, and the chamber disome communicates with the filter back cavity.Adopt the raw materials for plastics production of this scheme filtering molten state, not only simple in structure, easily manufactured, with low cost; And dismounting, cleaning filter net are also very quick and easy.The technical scheme that realizes the filter of this filtered version has a variety of, describes with regard to preferred several kinds of technical schemes below.

As the optimal selection scheme, said filter comprises that filtering jar decides body and filtering jar kinetoplast, and filtering jar is decided the outer circumferential side that body is socketed in the filtering jar kinetoplast; The filtering jar kinetoplast is decided body with respect to filtering jar and can be moved around, and the filtering jar kinetoplast is provided with through hole, and filtering jar is decided body can all cover through hole; Said first filtering bodies is located on the through hole; Filtering jar is decided body and is provided with through hole in the position of the first filtering bodies work, and said cavity is made up of through hole and through hole respectively jointly, and filtering jar kinetoplast and displacement generation equipment link.Like this after filter stops up; Move the filtering jar kinetoplast, make first filtering bodies move to the outside that filtering jar decide body, the filtering jar kinetoplast of appropriate length just can seal filtering jar and decides the through hole on the body at this moment; Make filter stop filtration work; Clean the tamper on first filtering bodies then, make first filtering bodies recover filter capacity, and wait for when filtration work next time begins the filtering jar kinetoplast is moved back into the operating position; Because filtering jar kinetoplast and displacement generation equipment link, make moving of filtering jar kinetoplast can realize the electric automatization operation, like this work of cleaning filter net seem very easily and convenient, also ten minutes fast; When filter quantity was two or more, filter can take turns to operate, thereby realized the plastic extruder continuous firing, and number of filters is preferably two; Two filters can be splits, also can be disjunctors, and the shared filtering jar of the filter of two disjunctors is decided body, and the filtering jar kinetoplast can be split, also can be disjunctor; As preferably; Two shared filtering jars of filter are decided body and a filtering jar kinetoplast; Distance is set on the filtering jar kinetoplast decides two through holes that the body width matches with filtering jar; In two through holes, first filtering bodies is set respectively, so only needs on the filtering jar kinetoplast, to dispose a cover displacement generation equipment and get final product, practice thrift cost; After one first filtering bodies is stopped up; Displacement produces the equipment quick acting; First filtering bodies of stopping up is moved to filtering jar decides the outside of body and cleans; Another one first filtering bodies that be connected as a single entity this moment just is in strain position and then carries out filtration work, and therewith in like manner, two first filtering bodies are worked by turns and guaranteed the plastic extruder continuous firing.

As preferable selection scheme, said first filtering bodies is located at an end of through hole, and through hole is provided with the groove that matches with first filtering bodies in the position of pressing close to first filtering bodies.The position of pressing close to first filtering bodies at through hole is provided with the groove that matches with first filtering bodies, makes the filtering bodies of winning can be arranged on the end position of through hole like this; Groove can be a square groove, also can be circular groove, and as preferably, this groove adopts spherical groove, the resistance of the raw materials for plastics production that spherical groove can reduce molten condition during through groove; First filtering bodies is located on the end of through hole, cleaning first filtering bodies like this can be very quick and convenient, the workload when alleviating cleaning first filtering bodies.

As preferable selection scheme, said filter comprises that filtering jar decides body and filtering jar kinetoplast, and filtering jar is decided the outer circumferential side that body is socketed in the filtering jar kinetoplast; The filtering jar kinetoplast is decided body with respect to filtering jar and can be moved around; End at the filtering jar kinetoplast is provided with blind hole, and the blind hole inwall is provided with the material hole that runs through, and filtering jar is decided body can all cover material hole; Said first filtering bodies is located on the material hole; Filtering jar is decided body and is provided with material path in the position of the first filtering bodies work, and said cavity is made up of blind hole, material hole, material path respectively jointly, and filtering jar kinetoplast and displacement generation equipment link.This filter preferred amount also is two, and two filters can be splits, also can be disjunctor, and the shared filtering jar of the filter of two disjunctors is decided body, and the filtering jar kinetoplast can be split, also can be disjunctor; As preferably, two filters decide body by a shared filtering jar and two filtering jar kinetoplasts constitute, and two filtering jar kinetoplasts are arranged in parallel; Filtering jar is decided the outer circumferential side that body is actively socketed on two filtering jar kinetoplasts respectively, on the connecting pipe of two filters and extrusion chamber, stop valve is set respectively, opens a stop valve so earlier and makes a filter job; The another one stop valve is closed, and the filter that stop valve is communicated with is for use with closing, after the filter of work stops up; Displacement generation equipment moves to the operating position with filter for use, opens the stop valve of filter for use, makes filter for use begin filtration work; Close another stop valve simultaneously; The filter of original work is quit work, and displacement produces first filtering bodies that equipment will take place to stop up and moves to filtering jar and decide the outside of body and carry out cleaning, and the filter that completion is cleaned is for use; Therewith in like manner, two filters are worked by turns and are guaranteed the plastic extruder continuous firing.

As preferable selection scheme, said filter comprises that filtering jar decides body and filtering jar kinetoplast, and filtering jar is decided body and is provided with the blind hole that matches with the filtering jar kinetoplast; The filtering jar kinetoplast is provided with an end opening one end sealed hollow, and the openend of cavity is decided body towards filtering jar, and the madial wall of cavity is provided with material hole; Said first filtering bodies is located at the openend position of cavity; When first filtering bodies was in the operating position, the openend of cavity stretches into filtering jar to be decided in the blind hole of body, and filtering jar decides also to be respectively equipped with on the body material path and the material hole that is connected with blind hole; Material hole and material path branch are listed in the both sides of first filtering bodies; Material hole is communicated with material hole, and said cavity is made up of blind hole and cavity respectively jointly, and filtering jar kinetoplast and displacement generation equipment link.This filter preferred amount also is two, and two filters can be splits, also can be disjunctor; As preferably, two filters adopt Contiuum types, and the filter of two disjunctors decides body by a shared filtering jar and two filtering jar kinetoplasts constitute; Filtering jar is decided the end face of body at its two ends and is respectively equipped with the blind hole that matches with the filtering jar kinetoplast; Two filtering jar kinetoplast branches are listed in the outside that filtering jar is decided the body two ends, on the connecting pipe of two filters and extrusion chamber, stop valve are set respectively, decide the processing technology of body in order to simplify filtering jar; Reduce manufacturing cost, stop valve preferably is arranged on filtering jar to be decided in two material paths of body.Open a stop valve so earlier and make a filter job, the another one stop valve is closed, and the filter that stop valve is communicated with is for use with closing; After the filter of work stopped up, displacement generation equipment moved to the operating position with filter for use, opens the stop valve of filter for use; Make filter for use begin filtration work, close another stop valve simultaneously, the filter of original work is quit work; Displacement produces obstruction will take place equipment first filtering bodies and moves to filtering jar and decide the outside of body and carry out cleaning; The filter of accomplishing cleaning is for use, and therewith in like manner, two filters are worked by turns and guaranteed the plastic extruder continuous firing.

As preferable selection scheme; Said filter comprises that the filtering jar of hollow decides body; The two ends of said first filtering bodies are passed filtering jar respectively and are decided body and extend to the outside that filtering jar is decided body, and first filtering bodies can move around with respect to filter, and first filtering bodies and displacement generation equipment link.When first filtering bodies that has reasonable length like this takes place to stop up in filter work; Displacement generation equipment moves first filtering bodies; Make the blocked part of first filtering bodies shift out the outside that filtering jar is decided body; The first filtering bodies cleaning part gets into filtering jar and decides body running, thereby guarantees the plastic extruder continuous firing.

Mode of communicating between filter and the filter back cavity can be enclosed, also can be open type.As preferable selection scheme, said barrel is provided with the uncovered receiving hopper of hollow in the position of filter back cavity, and the receiving hopper inner chamber is communicated with the filter back cavity, and the discharge nozzle of said filter is positioned at the upside of receiving hopper.The liquefaction in the heating of plastic extruder and extrusion process of the raw materials for plastics production of solid state is the melt of molten condition; The moisture and the air that originally were blended in the solid state raw materials for plastics production can be separated out in the heating of plastic extruder and extrusion process; Steam that these are separated out and air need in time to discharge, otherwise can influence the quality of plastic products; If adopt closed communication between filter and the filter back cavity, then need in the closed communication process, add vaccum-pumping equipment and remove steam and the air that produces, this can increase the manufacturing cost of plastic extruder; Because steam has certain lift with air itself in the high temperature, thus filter with filter between the back cavity employing open type and be communicated with comparatively suitablely, can practice thrift cost.

Said first filtering bodies is the combination of screen pack or filter or screen pack and filter.

As preferable selection scheme, said filter back cavity is being provided with second filtering bodies with the die head connection place, and second filtering bodies is the combination of screen pack or filter or screen pack and filter.Be provided with the shortcut connecting pipeline between extrusion chamber and the filter back cavity, and the shortcut connecting pipeline is provided with stop valve.Second filtering bodies is set, and effect has two aspects, and one of which makes plastic melt can pass through secondary filter, helps improving the quality of plastic products; They are two years old; In order to reduce the manufacturing cost of plastic extruder; Be located at the outer filter for installation of barrel and be preferably one or two; If when filter for installation that barrel is outer and displacement produce device fails, can open the stop valve on the shortcut connecting pipeline, make the outer filter of barrel under the prerequisite of guaranteeing the plastic extruder operate as normal, obtain the repairing time.

The beneficial effect of the utility model is:

1, because one or more filter is set outside the plastic extruder barrel; Make the plastic extruder continuous operation effectively to be ensured; The a large amount of waste of raw materials that can avoid the frequent debugging of drive unit frequent starting and plastic extruder to cause are like this practiced thrift cost, reduce energy consumption; Raise labour productivity, prolong the service life of equipment;

2, because filter adopts simple structure cleverly, make that the cleaning of filtering bodies is convenient, fast, reduce operating personnel's workload, reduce operating personnel's labour intensity, practice thrift the maintenance cost of plastic extruder;

3, because the cleaning of filtering bodies is simplified, and making the filtering bodies cleaning suitably increase frequency becomes possibility, guarantees that the filter capacity of filtering bodies remains on preferable states, the quality that helps plastic products improves.

Description of drawings

Fig. 1 is a kind of structural representation of the utility model open type exhaust;

Fig. 2 is the sketch map of the utility model barrel when cutting open;

Fig. 3 is a kind of structural representation of the closed exhaust of the utility model;

Fig. 4 is first kind of structure of filter sketch map of the utility model;

Fig. 5 is second kind of structure of filter sketch map of the utility model;

Fig. 6 is the third structure of filter sketch map of the utility model;

Fig. 7 is the 4th kind of structure of filter sketch map of the utility model.

The specific embodiment

Pass through preferred embodiment below, and combine Figure of description that the technical scheme of the utility model is further specified:

Embodiment: a kind of plastic extruder that has intermediate filter, like Fig. 1, shown in Figure 2, among the figure: 1: drive unit; 2: feed hopper; 3: barrel; 4: the shortcut pipe; 5: the first stop valves; 6: receiving hopper; 7: die head; 8: discharge nozzle; 9: filter; 10: feed pipe; 11: screw rod; 12: main thread; 13: inferior screw thread; 14: filter; 15: the filter back cavity; 16: extrusion chamber.The barrel 3 that comprises hollow; Be provided with the screw rod 11 rotatable and that match with barrel 3 with respect to barrel 3 in the barrel 3, an end of screw rod 11 is connected with drive unit 1, and the centre of screw rod 11 is provided with and the opposite inferior screw thread 13 of screw rod 11 main threads 12 hands of spiral; Inferior screw thread 13 is divided into extrusion chamber 16 and filter back cavity 15 with the two ends of barrel 3; One end upside of barrel 3 is connected with feed hopper 2 in the fixed-site near drive unit 1, and barrel 3 is fixedly connected the die head 7 that is useful on the shaping discharging at the downside of the other end, and feed hopper 2 communicates with extrusion chamber 16; Die head 7 communicates with filter back cavity 15; The outside of barrel 3 is fixedly connected with filter 9 (concrete structure of filter 9 is explained in the back) in inferior screw thread 13 positions, and filter 9 is connected with extrusion chamber 16 through feed pipe 10, and filter 9 also is fixedly connected with discharge nozzle 8; The upside of barrel 3 is connected with receiving hopper 6 uncovered and that be connected with filter back cavity 15 at filter back cavity 15 near the fixed-site of filter 9; Discharge nozzle 8 is positioned at the top of receiving hopper 6, and the outside of barrel 3 is provided with shortcut pipe 4 between extrusion chamber 16 and filter back cavity 15, and shortcut pipe 4 is connected with extrusion chamber 16, filter back cavity 15 respectively; And shortcut pipe 4 is provided with first stop valve 5, and filter back cavity 15 is being provided with filter 14 with die head 7 junctions.

As shown in Figure 3, all right closed communication between the filter of plastic extruder and the filter back cavity is among the figure: 3: barrel; 17: logical hopper; 18: vacuum-pumping tube; 8: discharge nozzle; 9: filter.The upside of barrel 3 is connected with the logical hopper 17 that seals and be connected with the filter back cavity at the filter back cavity near the fixed-site of filter 9; The discharge nozzle 8 of filter 9 directly is communicated with logical hopper 17; Logical hopper 17 is fixedly connected with and leads to the vacuum-pumping tube 18 that hopper 17 is communicated with in a side of discharge nozzle 8; One end of vacuum-pumping tube 18 is fixedly connected with logical hopper 17, and the other end of vacuum-pumping tube 18 is connected with the vaccum-pumping equipment (not shown).

Filter 9 comprises filter, and this filtration device structure form has multiple, explains with regard to four kinds of preferred filtration device structures below.

First kind of filter: as shown in Figure 4, among the figure: 10: feed pipe; 19: filtering jar is decided body; 20: the filtering jar kinetoplast; 21: connecting portion; 22: through hole; 23: screen pack; 24: through hole; 25: groove.Said filter comprises that cube-shaped filtering jar decides body 19 and rectangular-shaped filtering jar kinetoplast 20; Filtering jar is decided the outer circumferential side that body 19 is socketed in filtering jar kinetoplast 20, and filtering jar kinetoplast 20 is decided body 19 with respect to filtering jar and can be moved around, and is respectively arranged with two square through holes 22 on the filtering jar kinetoplast 20; Arbitrary through hole 22 in two through holes 22 can be decided body 19 by filtering jar and cover; One end of two through holes 22 is fixedly connected with the same side that 23, two screen packs 23 of screen pack are positioned at filtering jar kinetoplast 20 respectively, and filtering jar is decided body 19 and is provided with circular through hole 24 at the center of square sides; The diameter of through hole 24 is less than the length of side of square screen pack 23; Through hole 24 is divided into two sections by filtering jar kinetoplast 20, and through hole 24 end faces of wherein pressing close to screen pack 23 are provided with spherical crown shape groove 25, and the openend of groove 25 and screen pack 23 match; The one section through hole 24 that is provided with groove 25 forms the chamber disome with groove 25, screen pack 23; Another section and through hole 22, the screen pack 23 of through hole 24 form the chamber one together, and the chamber one is connected with extrusion chamber through feed pipe 10, and the chamber disome is connected with the filter back cavity through discharge nozzle (not shown among Fig. 4); One end face of filtering jar kinetoplast 20 is provided with connecting portion 21, and connecting portion 21 is fixedly connected with the hydraulic cylinder (not shown).

Second kind of filter: as shown in Figure 5, among the figure: 10: feed pipe; 26: filtering jar is decided body; 27: the filtering jar kinetoplast; 28: blind hole; 29: annular groove; 30: filtering holes.Said filter comprises that the filtering jar of cubic decides the filtering jar kinetoplast 27 of body 26 and pole shape, and an end of filtering jar kinetoplast 27 is provided with blind hole 28, and the outer peripheral face of filtering jar kinetoplast 27 is provided with annular groove 29; The bottom surface of annular groove 29 is provided with several filtering holes 30 that communicates with blind hole 28; The quantity of said filtering jar kinetoplast 27 is two, and two filtering jar kinetoplasts 27 are arranged in parallel, and filtering jar is decided the outer circumferential side that body 26 is socketed in two filtering jar kinetoplasts 27 simultaneously; Filtering jar kinetoplast 27 is decided body 26 with respect to filtering jar and can be moved around; Filtering jar is decided all cover ring connected in stars 29 of body 26, and filtering jar is decided body 26 and is provided with two material path (not shown)s, and one of them material path can be connected with an annular groove 29; Another material path can be connected with another annular groove 29; Material path forms the chamber one with annular groove 29, blind hole 28 formation chamber disomes, and the chamber one is connected with extrusion chamber through feed pipe 10; The chamber disome is connected with the filter back cavity through discharge nozzle (not shown among Fig. 5), and the other end of filtering jar kinetoplast 27 is fixedly connected with the hydraulic cylinder (not shown).

The third filter: as shown in Figure 6, among the figure: 8: discharge nozzle; 31: filtering jar is decided body; 32: material hole; 33: blind hole; 34: material hole; 35: cavity; 36: the filtering jar kinetoplast; 37: filter; 38: circular groove; 39: material path; 40: the second stop valves.Said filter comprises that columned filtering jar decides body 31 and columned filtering jar kinetoplast 36, and the two ends that filtering jar is decided body 31 are respectively arranged with the blind hole 33 that matches with filtering jar kinetoplast 36, and the inner bottom surface of blind hole 33 is provided with circular groove 38; The diameter of circular groove 38 is less than the diameter of blind hole 33, and an end of filtering jar kinetoplast 36 is provided with an end opening one end sealed hollow 35, and the openend of cavity 35 is decided body 31 towards filtering jar; The madial wall of cavity 35 is provided with material hole 34, and the openend of cavity 35 is provided with filter 37, and filtering jar decides also to be respectively equipped with on the body 31 material path 39 and material hole 32 that is connected with blind hole 33; When filter 37 is in the operating position; The openend of cavity 35 stretches into filtering jar to be decided in the blind hole 33 of body 31, and at this moment, material hole 34 and material path were listed in the both sides of filter 37 in 39 minutes; Material hole 34 is communicated with material hole 32; Be provided with second stop valve 40 in the material path 39, the quantity of said filtering jar kinetoplast 36 is two, circular groove 38 and filter 37 formation chamber one; Cavity 35 and filter 37 formation chamber disomes; The chamber one is connected with extrusion chamber through feed pipe (not shown among Fig. 6), and the chamber disome is connected with the filter back cavity through discharge nozzle 8, and the other end of filtering jar kinetoplast 36 is fixedly connected with the hydraulic cylinder (not shown).

The 4th kind of filter: as shown in Figure 7, among the figure: 41: filtering jar is decided body; 42: screen pack.Said filter comprises that the filtering jar of hollow decides body 41; Filtering jar is decided to be provided with screen pack 42 in the cavity (not shown) in the body 41; The two ends of screen pack 42 are passed filtering jar respectively and are decided the madial wall of body 41 and extend to the outside that filtering jar is decided body 41, and screen pack 42 is divided into chamber one and chamber disome with cavity, and the chamber one communicates with extrusion chamber through the feed pipe (not shown); The chamber disome communicates with the filter back cavity through the discharge nozzle (not shown), and it is removable that screen pack 42 is decided body 41 with respect to filtering jar.

Above-described embodiment is a kind of preferred version of the utility model, is not the utility model is done any pro forma restriction, under the prerequisite that does not exceed the technical scheme that claim puts down in writing, also has other variant and remodeling.

Make the content of detailed description in this specification, belong to the those skilled in the art known prior art.

Claims

1. the plastic extruder that has intermediate filter comprises the barrel of hollow, is provided with the screw rod rotatable and that match with barrel with respect to barrel in the barrel; One end and the drive unit of screw rod link, and are respectively equipped with feed hopper on the barrel and the die head of the discharging that is used to be shaped, and it is characterized in that: said barrel is provided with extrusion chamber and filter back cavity; Feed hopper communicates with extrusion chamber, and die head communicates with the filter back cavity, and the barrel outside is provided with N filter; N is >=1 integer; Extrusion chamber is connected through filter between the back cavity with filter, when N >=2, and N filter parallel connection.

2. the plastic extruder that has intermediate filter according to claim 1; It is characterized in that: said filter comprises the filter of hollow; Be provided with first filtering bodies in the cavity in the filter; First filtering bodies is divided into chamber one and chamber disome with cavity, and the chamber one communicates with extrusion chamber, and the chamber disome communicates with the filter back cavity.

3. the plastic extruder that has intermediate filter according to claim 2; It is characterized in that: said filter comprises that filtering jar decides body and filtering jar kinetoplast, and filtering jar is decided the outer circumferential side that body is socketed in the filtering jar kinetoplast, and the filtering jar kinetoplast is decided body with respect to filtering jar and can be moved around; The filtering jar kinetoplast is provided with through hole; Filtering jar is decided body can all cover through hole, and said first filtering bodies is located on the through hole, and filtering jar is decided body and is provided with through hole in the position of the first filtering bodies work; Said cavity is made up of through hole and through hole respectively jointly, and filtering jar kinetoplast and displacement generation equipment link.

4. the plastic extruder that has intermediate filter according to claim 3 is characterized in that: said first filtering bodies is located at an end of through hole, and through hole is provided with the groove that matches with first filtering bodies in the position of pressing close to first filtering bodies.

5. the plastic extruder that has intermediate filter according to claim 2 is characterized in that: said filter comprises that filtering jar decides body and filtering jar kinetoplast, and filtering jar is decided the outer circumferential side that body is socketed in the filtering jar kinetoplast; The filtering jar kinetoplast is decided body with respect to filtering jar and can be moved around; End at the filtering jar kinetoplast is provided with blind hole, and the blind hole inwall is provided with the material hole that runs through, and filtering jar is decided body can all cover material hole; Said first filtering bodies is located on the material hole; Filtering jar is decided body and is provided with material path in the position of the first filtering bodies work, and said cavity is made up of blind hole, material hole, material path respectively jointly, and filtering jar kinetoplast and displacement generation equipment link.

6. the plastic extruder that has intermediate filter according to claim 2 is characterized in that: said filter comprises that filtering jar decides body and filtering jar kinetoplast, and filtering jar is decided body and is provided with the blind hole that matches with the filtering jar kinetoplast; The filtering jar kinetoplast is provided with an end opening one end sealed hollow, and the openend of cavity is decided body towards filtering jar, and the madial wall of cavity is provided with material hole; Said first filtering bodies is located at the openend position of cavity; When first filtering bodies was in the operating position, the openend of cavity stretches into filtering jar to be decided in the blind hole of body, and filtering jar decides also to be respectively equipped with on the body material path and the material hole that is connected with blind hole; Material hole and material path branch are listed in the both sides of first filtering bodies; Material hole is communicated with material hole, and said cavity is made up of blind hole and cavity respectively jointly, and filtering jar kinetoplast and displacement generation equipment link.

7. the plastic extruder that has intermediate filter according to claim 2; It is characterized in that: said filter comprises that the filtering jar of hollow decides body; The two ends of said first filtering bodies are passed filtering jar respectively and are decided body and extend to the outside that filtering jar is decided body; First filtering bodies can move around with respect to filter, and first filtering bodies and displacement generation equipment link.

8. according to claim 1 or 2 or 3 or 4 or 5 or the 6 or 7 described plastic extruders that have intermediate filter; It is characterized in that: said barrel is provided with the uncovered receiving hopper of hollow in the position of filter back cavity; The receiving hopper inner chamber is communicated with the filter back cavity, and the discharge nozzle of said filter for installation is positioned at the upside of receiving hopper.

9. according to claim 2 or 3 or 4 or 5 or the 6 or 7 described plastic extruders that have intermediate filter, it is characterized in that: said first filtering bodies is the combination of screen pack or filter or screen pack and filter.

10. according to claim 1 or 2 or 3 or 4 or 5 or the 6 or 7 described plastic extruders that have intermediate filter; It is characterized in that: said filter back cavity is being provided with second filtering bodies with the die head connection place, and second filtering bodies is the combination of screen pack or filter or screen pack and filter.