CN113619063A

CN113619063A - Three-layer co-extrusion feeding system for producing geomembrane

Info

Publication number: CN113619063A
Application number: CN202110769460.0A
Authority: CN
Inventors: 华登岷; 孙泮虎
Original assignee: Shandong Jiantong Geotechnical Materials Co ltd
Current assignee: Shandong Jiantong Geotechnical Materials Co ltd
Priority date: 2021-07-07
Filing date: 2021-07-07
Publication date: 2021-11-09

Abstract

The application discloses a three-layer co-extrusion feeding system for producing geomembranes, which comprises a raw material storage unit, a feeding unit and a feeding unit, wherein the raw material storage unit is used for storing different materials; the pneumatic conveying unit is used for conveying the materials in the raw material storage unit in a classified manner; the material mixing unit is connected with a hopper of the screw extruder, and is used for receiving and mixing different types of materials conveyed by the pneumatic conveying unit, and the mixed materials are conveyed to the hopper by the material mixing unit; and the quantitative part is respectively connected with the pneumatic conveying unit and the mixing unit and is used for quantitatively controlling the amount of different types of materials conveyed to the mixing unit by the pneumatic conveying assembly. Compared with the existing feeding mode of front-end mixing, the proportion of each component in the mixed material is prevented from changing in the pneumatic conveying process, so that the mixing effect of the material is favorably ensured, and the quality of the finally produced geomembrane product is favorably ensured.

Description

Three-layer co-extrusion feeding system for producing geomembrane

Technical Field

The invention belongs to the technical field of geomembrane production, and particularly relates to a three-layer co-extrusion feeding system for producing a geomembrane.

Background

The geomembrane is a geotechnical anti-seepage material which is compounded by taking a plastic film as an anti-seepage base material and non-woven fabrics. According to different base materials, the geomembrane can be widely applied to construction sites of various industries, such as refuse landfills and sewage treatment plants; seepage prevention, leakage stoppage, reinforcement and seepage prevention of rivers, lakes, reservoirs and dams; seepage prevention of subways, underground engineering of buildings, planted roofs, roof gardens and sewage pipes; chemical plants, oil refineries, oil storage tank seepage prevention, chemical reaction tanks, liners of sedimentation tanks, secondary linings and the like.

The production of geomembranes with different base materials requires reasonable matching of raw material components for producing the base materials and accurate blending of the proportions of the different components. Traditional batching and compounding adopt manual operation's mode, this just needs to consume a large amount of physical power and mental power of producers, and intensity of labour is very big. A large amount of manpower and production cost are wasted, and production personnel are easy to make mistakes due to long-time high-intensity labor, so that the production efficiency is extremely low finally.

Therefore, there is a feeding mode of feeding the raw materials by pneumatic conveying after the raw materials are mixed in the prior art, but because of the difference of the types of the raw materials, the density of various raw material particles is also different, so that the conveying speed of the raw material particles with low density in the pneumatic conveying process is faster than that of the raw material particles with high density, and further when the mixed materials enter the feed hopper of the screw extruder, the proportion among the different types of the materials is changed, the mixing effect of the materials is deteriorated, and the quality of the geomembrane product is finally influenced.

It will thus be seen that the prior art is susceptible to further improvements and enhancements.

Disclosure of Invention

The invention provides a three-layer co-extrusion feeding system for producing geomembranes, which aims to solve at least one technical problem of the technical problems.

The technical scheme adopted by the invention is as follows:

the invention provides a three-layer co-extrusion feeding system for producing geomembranes, which comprises a raw material storage unit, a feeding unit and a feeding unit, wherein the raw material storage unit is used for storing different materials; the pneumatic conveying unit is used for conveying the materials in the raw material storage unit in a classified manner; the material mixing unit is connected with a hopper of the screw extruder, and is used for receiving and mixing different types of materials conveyed by the pneumatic conveying unit, and the mixed materials are conveyed to the hopper by the material mixing unit; and the quantitative piece is respectively connected with the pneumatic conveying unit and the mixing unit and is used for quantitatively controlling the amount of different types of materials conveyed to the mixing unit by the pneumatic conveying assembly.

As a preferred embodiment of the present invention, the pneumatic conveying unit includes a conveying pipeline, a pneumatic material collecting bin, and an exhaust fan; one end of the material conveying pipeline is communicated with the raw material storage unit, and the other end of the material conveying pipeline is communicated with the pneumatic aggregate bin; the air exhauster is the conveying pipeline with the pneumatic aggregate bin is inside to provide the negative pressure environment.

In a preferred embodiment of the present invention, a material suction head is disposed at one end of the material delivery pipeline close to the material storage unit, and a cut-off valve and a check valve are further disposed on the material delivery pipeline.

As a preferred embodiment of the present invention, the pneumatic material collecting bin sucks a material with a required weight from the raw material storage unit in a material sucking manner through a negative pressure environment generated by the exhaust fan, and then the material in the pneumatic material collecting bin enters the material mixing unit to be mixed and stirred, so as to ensure that the requirements of the production process are met.

As a preferred embodiment of the present invention, the quantitative member includes a split bin, the split bin is respectively communicated with the pneumatic material collecting bin and the material mixing unit, a material level meter is disposed on a side portion of the split bin, and a blanking switch and a weighing member are disposed on a lower portion of the split bin.

As a preferred embodiment of the present invention, the quantitative member further comprises a transition hopper, the transition hopper is arranged below the split bin and is used for receiving the materials from the split bin; the transition hopper is communicated with the mixing unit, and a blanking switch and a weighing piece are arranged at the lower part of the transition hopper.

As a preferred embodiment of the present invention, the mixing unit includes a mixing bin and a driving member; the mixing bunker is internally provided with a stirring device, the driving piece is connected with the stirring device, or the driving piece is directly connected with the mixing bunker, and the driving piece drives the mixing bunker to move to mix materials.

In a preferred embodiment of the present invention, a level indicator is disposed below the interior of the mixing bin.

As a preferred embodiment of the present invention, the apparatus further comprises a control unit, wherein the control unit is respectively connected to the raw material storage unit, the pneumatic conveying unit, the mixing unit and the quantitative member, and the raw material storage unit, the pneumatic conveying unit, the mixing unit and the quantitative member are controlled by the control unit in a linkage manner.

In a preferred embodiment of the present invention, the raw material storage unit, the pneumatic conveying unit, the mixing unit, and the dosing member are provided in plural sets, and the raw material can be fed and mixed in plural lines at the same time.

Due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the three-layer co-extrusion feeding system disclosed by the invention adopts a feeding and mixing mode of front-end feeding and rear-end mixing, namely, materials are firstly conveyed to the mixing bin through a conveying pipeline, a pneumatic collecting part and the like, and are directly fed to the feeding hopper of the screw extruder after the materials are mixed in the mixing bin.

2. The three-layer co-extrusion feeding system disclosed by the invention realizes automation of the batching, feeding and mixing processes, greatly reduces the labor intensity, is favorable for saving manpower, saves the labor cost and is also favorable for reducing the probability of errors caused by manual operation; automatic batching, feed and compounding still are favorable to improving production efficiency.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of a three-layer co-extrusion feeding system;

FIG. 2 is a schematic view of a part of a three-layer co-extrusion feeding system;

FIG. 3 is a schematic structural diagram of a mixing unit according to an embodiment;

fig. 4 is a schematic structural view of a mixing unit in the second embodiment.

Wherein,

1 a raw material storage unit 1;

21 a material conveying pipeline, 211 a raw material suction head, 212 a cut-off valve, 22 a pneumatic material collecting bin, 221 an air suction opening, 23 an exhaust fan, 231 an air suction opening and 24 an air flow pipeline;

3, a mixing unit, 31 a mixing bin, 311 a stirring device, 312 a stirring shaft, 313 stirring blades, 314 gear teeth, 315 convex ribs, 32 driving pieces and 321 driving gears;

41 split bins, 42 transition hoppers, 43 charge level meters, 44 blanking switches, 441 connecting rods and 442 hydraulic devices;

5 a control unit;

6 screw extruder, 61 hopper.

Detailed Description

In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In addition, in the description of the present invention, it is to be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

As shown in fig. 1 to 4, the present invention provides a three-layer co-extrusion feeding system for producing geomembranes, which comprises a raw material storage unit 1 for storing different kinds of materials; the pneumatic conveying unit is used for conveying the materials in the raw material storage unit 1 in a classified manner; the material mixing unit 3 is connected with a hopper of the screw extruder 6, the material mixing unit 3 is used for receiving and mixing different types of materials conveyed by the pneumatic conveying unit, and the mixed materials are directly conveyed to the hopper by the material mixing unit 3; and the quantitative part is respectively connected with the pneumatic conveying unit and the mixing unit 3 and is used for quantitatively controlling the amount of different types of materials conveyed into the mixing unit 3 by the pneumatic conveying assembly.

Compared with the mode of manual material mixing, material mixing and material feeding in the prior art, the three-layer co-extrusion material feeding system disclosed by the invention realizes automation of the material mixing, material mixing and material feeding processes, greatly saves manpower, is favorable for avoiding the probability of errors caused by manual operation, and is favorable for improving the production efficiency; in addition, compared with the mode of mixing materials at the front end of the existing pneumatic conveying and feeding system, the three-layer co-extrusion feeding system adopts the mode of feeding materials at the front end and mixing materials at the rear end, so that the phenomenon that the proportions of components in the mixed materials are changed due to different densities of different material particles and different conveying speeds in the pneumatic conveying process is avoided, the mixing effect of the materials is further favorably ensured, and the product quality of the produced geomembrane is finally favorably ensured.

In addition, the quantitative part is favorable for further accurately controlling the ratio among different materials, and is also favorable for controlling the conveying capacity and the conveying speed of the materials, so that the capacity can be rapidly allocated while the material mixing effect is ensured, the waste of the capacity is avoided, and the production efficiency is improved.

Further, as shown in fig. 1, the pneumatic conveying unit includes a conveying pipeline 21, a pneumatic collecting bin 22 and an exhaust fan 23; one end of the material conveying pipeline 21 is communicated with the raw material storage unit 1, and the other end is communicated with the pneumatic aggregate bin 22; the suction fan 23 provides a negative pressure environment inside the delivery duct 21 and the pneumatic collection bin 22. In a specific example, as shown in fig. 2, the air suction port 231 of the air suction fan 23 is communicated with the air suction port 211 of the pneumatic aggregate bin 22 through the air flow pipeline 24, and the air suction port 211 of the pneumatic aggregate bin 22 is further provided with a cut-off valve 212.

In a preferred embodiment of the present application, with continued reference to fig. 1, a material suction head 211 is provided at one end of the delivery conduit 21 near the material storage unit 1, and a shut-off valve 212 and a check valve are further provided on the delivery conduit 21. The arrangement of the raw material suction head 211 facilitates the feeding of the material conveying pipeline 21, and is favorable for improving the conveying efficiency; the arrangement of the cut-off valve 212 is convenient for controlling the material conveying process and is also convenient for overhauling and replacing the material conveying pipeline 21; the check valve arranged on the delivery pipeline 21 can prevent the material from flowing backwards and/or losing delivery power to stay in the pipeline to cause the blockage of the delivery pipeline 21 when the pressure in the pipeline is suddenly increased, and can also prevent the influence on the normal work of the raw material suction head 211 and the raw material storage unit 1.

Further, as shown in fig. 1, the pneumatic material collecting bin 22 sucks the material with the required weight from the raw material storage unit 1 in a material sucking manner through a negative pressure environment generated by the exhaust fan 23, and then the material in the pneumatic material collecting bin 22 enters the material mixing unit 3 to be mixed and stirred so as to meet the requirements of the production process.

Under the negative pressure effect, the material is inhaled very easily, consequently adopts the mode of negative pressure transport to make the overall structure of pneumatic conveying unit simple in this application, is favorable to practicing thrift installation space and equipment cost. And adopt the negative pressure to carry and make raw materials storage unit 1 can adopt open structure, also made things convenient for the material loading of raw materials storage unit 1, and then can feed and carry continuously. In addition, the materials are conveyed under negative pressure, and moisture is easy to evaporate, so that the influence of the damp of the mixed materials on the product quality is avoided.

It should be noted that the device for providing negative pressure environment inside the material conveying pipeline 21 and the pneumatic material collecting bin 22 in the present application is not limited to the exhaust fan 23 in the foregoing example, and other devices or apparatuses such as a roots vacuum pump may be used, and the present invention is not limited to this.

Further, as shown in fig. 2, the quantitative member includes a split bin 31, the split bin 31 is respectively communicated with the pneumatic material collecting member and the material mixing unit 3, a material level meter 43 is disposed at a side portion of the split bin 31, and a material discharging switch 44 and a weighing member (not shown in the figure) are disposed at a lower portion of the split bin 31.

In a specific example, as shown in fig. 1, a plurality of split bins 31 and a plurality of pneumatic aggregate bins 22 are provided, and the split bins 31 are correspondingly communicated with the pneumatic aggregate bins 22, so that different types of materials can be fed simultaneously; meanwhile, the material level meter 43 and the weighing piece which are arranged on the split bin 31 are matched, so that the accurate control of the feeding amount of different types of materials is facilitated, and the follow-up mixing effect among different types of materials is further ensured.

Furthermore, as shown in fig. 3 and 4, the quantitative member further includes a transition hopper 42, the transition hopper 42 is disposed below the split bin 31 and is used for receiving the materials from the split bin 31; the transition hopper 42 is communicated with the mixing unit 3, and the lower part of the transition hopper 42 is provided with a blanking switch 44 and a weighing piece. Continuing to refer to fig. 3 and 4, the transition hopper 42 can receive the materials in each split bin 31, in the actual working process, the blanking switches 44 at the bottom of each split bin 31 can be opened in sequence according to the conveying speeds of different materials to feed the materials to the transition hopper 42, and the weighing pieces arranged at the bottom of the transition hopper 42 can accurately control the amount of the materials conveyed to the transition hopper 42 by each split bin 31, so that the proportion of each component in the mixed materials can be further ensured to meet the process requirements, the mixing effect of the rear-end materials during mixing can be further improved, and the product quality can be finally improved.

It should be noted that the composition and the specific structure of the mixing unit 3 are not specifically limited in the present application, and any one of the following embodiments may be adopted:

the first implementation mode comprises the following steps: as shown in fig. 3, the mixing unit 3 comprises a mixing bin 31 and a driving member 32; a stirring device 311 is arranged in the mixing bin 31, and the driving member 32 is connected with the stirring device 311.

In a specific example, as shown in fig. 3, the stirring device 311 includes a stirring shaft 312 disposed in the mixing bin 31 and a stirring blade 313 connected to the stirring shaft 312; the driving member 32 is connected to the stirring shaft 312, so as to drive the stirring shaft 312 to rotate, and further drive the stirring blades 313 to stir the material in the mixing bin 31.

As a preferred implementation of the embodiment of the present application, with continued reference to fig. 3, the stirring shaft 312 is horizontally disposed in the mixing bin 31, and the plurality of stirring blades 313 are uniformly arranged along the stirring shaft 312. Of course, the stirring shaft 312 may also be arranged in the mixing silo 31 in a vertical direction. The mode that sets up (mixing) shaft 312 and stirring leaf 313 is adopted, can be so that the material obtains abundant stirring in blending bunker 31 and mixes, is favorable to promoting the compounding effect.

It should also be noted that, in the present embodiment, the arrangement of the stirring shaft 312 and the stirring blade 313 is not particularly limited, and the above scheme may be adopted, or a plurality of stirring shafts 312 may be arranged, or a scheme that a plurality of stirring shafts 312 are arranged in parallel or the above two examples are combined may be adopted, or other structures or devices that can better achieve the effect of stirring and mixing materials may also be adopted.

The second embodiment: as shown in fig. 4, the present embodiment is different from the first embodiment in that the driving member 32 is directly connected to the mixing bin 31, and the driving member 32 drives the mixing bin 31 to mix the materials.

In another specific example, as shown in fig. 4, the driving member 32 has a first mating portion, the mixing bin 31 has a second mating portion corresponding to the first mating portion, and the first mating portion and the second mating portion are mated, and the driving member 32 can drive the mixing bin 31 to rotate.

As a preferred embodiment of the present application, with continued reference to fig. 4, the first mating portion is a driving gear 321, and the second mating portion is gear teeth 314 circumferentially disposed on an outer wall of the mixing bowl 31, the gear teeth 314 being capable of meshing with the driving gear 321. The driving member 32 is a servo motor, and the servo motor drives the driving gear 321 to rotate, so as to drive the material mixing bin 31 to rotate, and further to rotate and mix the materials in the material mixing bin 31.

With continued reference to FIG. 4, ribs 315 may also be disposed on the inner wall of the mixing silo 31. The setting of protruding muscle 315 can increase the collision reflection route of material in blending bunker 31 to make the mixture of material in blending bunker 31 even more abundant, be favorable to promoting compounding effect and compounding efficiency, practice thrift the compounding time, improve production efficiency.

Compare in embodiment one, driving piece 32 direct drive blending bunker 31 in this embodiment carries out the compounding, is favorable to practicing thrift the space in the blending bunker 31, improves the compounding volume of unit interval, and then is favorable to practicing thrift the compounding time, improves production efficiency.

Of course, the compounding unit 3 may also be of a composition and structure other than the above-described embodiments.

Further, a level meter 43 may be further disposed below the interior of the mixing bin 31. The charge level indicator 43 is arranged to facilitate the real-time monitoring of the feeding condition of the feed hopper 61 of the mixing bin 31 to the screw extruder 6, and is favorable for ensuring the continuous and stable operation of the whole feeding and mixing process.

It should be noted that the type of the level gauge 43 is not particularly limited in the present application, and may be a magnetic flip-chip type level gauge 43, an ultrasonic type level gauge 43, or other more types of level gauges 43, and may be flexibly selected according to production needs.

It should also be noted that, the present application does not specifically limit the specific structure of the blanking switch 44, and as a preferred embodiment of the present application, as shown in fig. 3 and 4, the blanking switch 44 is connected to the hydraulic device 442 through the connecting rod 441, the hydraulic device 442 can bear a large load, and the hydraulic device 442 is used to control the opening and closing of the blanking switch 44, so that the operation is accurate, the blanking speed is conveniently adjusted, the production state of the equipment is conveniently adjusted, and the waste of productivity is avoided. Of course, the blanking switch 44 may be replaced by other devices or structures such as an electromagnetic valve.

Further, as shown in FIG. 1, the three-layer co-extrusion feed system disclosed in the present application further comprises a control unit 5. The control unit 5 is respectively connected with the raw material storage unit 1, the pneumatic conveying unit, the mixing unit 3 and the quantifying piece, and the raw material storage unit 1, the pneumatic conveying unit, the mixing unit 3 and the quantifying piece are controlled in a linkage mode through the control unit 5.

The setting of the control unit 5 has further promoted the degree of automation of the three-layer co-extrusion feeding system disclosed in this application, and then has reduced manual work volume, is favorable to reducing intensity of labour, saves the cost of labor, and the material loading compounding error that manual operation that also can significantly reduce simultaneously probably brought further promotes the degree of accuracy of material loading compounding, promotes the quality of final product.

It should be noted that the present invention does not specifically limit the type and structure of the control unit 5, and as a preferred embodiment of the present application, the control unit 5 may be a PLC controller, which has a simple overall structure, is sensitive to response, has accurate control action, and is very suitable for large-scale industrial production. Of course, other controllers and control methods may be used.

In addition, as shown in fig. 1, the raw material storage unit 1, the pneumatic conveying unit, the mixing unit 3 and the quantitative member disclosed in the present application have multiple sets, so that feeding and mixing can be performed simultaneously in multiple lines, and the production efficiency is further improved.

The method can be realized by adopting or referring to the prior art in places which are not described in the invention.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A three-layer co-extrusion feeding system for producing geomembranes, comprising:

a raw material storage unit for storing different kinds of materials;

the pneumatic conveying unit is used for conveying the materials in the raw material storage unit in a classified manner;

the material mixing unit is connected with a hopper of the screw extruder, and is used for receiving and mixing different types of materials conveyed by the pneumatic conveying unit, and the mixed materials are conveyed to the hopper by the material mixing unit;

and the quantitative piece is respectively connected with the pneumatic conveying unit and the mixing unit and is used for quantitatively controlling the amount of different types of materials conveyed to the mixing unit by the pneumatic conveying assembly.

2. A three-layer co-extrusion feeding system as set forth in claim 1, wherein the pneumatic conveying unit comprises a conveying pipeline, a pneumatic collecting bin and an exhaust fan; one end of the material conveying pipeline is communicated with the raw material storage unit, and the other end of the material conveying pipeline is communicated with the pneumatic aggregate bin; the air exhauster is the conveying pipeline with the pneumatic aggregate bin is inside to provide the negative pressure environment.

3. A triple co-extrusion feed system as claimed in claim 2 wherein said feed delivery conduit is provided with a material suction head at an end thereof adjacent said material storage unit, said feed delivery conduit being further provided with a shut-off valve and a check valve.

4. A three-layer co-extrusion feeding system as set forth in claim 2, wherein the pneumatic material collecting bin sucks the material with the required weight from the raw material storage unit in a material sucking manner through the negative pressure environment generated by the exhaust fan, and then the material in the pneumatic material collecting bin enters the material mixing unit for mixing and stirring to ensure that the production process requirements are met.

5. A three-layer co-extrusion feeding system as set forth in claim 4, wherein the quantitative member comprises a split bin, the split bin is respectively communicated with the pneumatic material collecting bin and the material mixing unit, a material level meter is arranged on the side of the split bin, and a blanking switch and a weighing member are arranged on the lower portion of the split bin.

6. A three-layer co-extrusion feeding system as set forth in claim 5, wherein the quantitative member further comprises a transition hopper disposed below the split bins for receiving the materials from the split bins; the transition hopper is communicated with the mixing unit, and a blanking switch and a weighing piece are arranged at the lower part of the transition hopper.

7. A three-layer co-extrusion feeding system as set forth in claim 5, wherein the mixing unit comprises a mixing silo and a driving member; a stirring device is arranged in the mixing bin, the driving piece is connected with the stirring device, or,

the driving piece is directly connected with the mixing bin, and the driving piece drives the mixing bin to act to mix materials.

8. A triple co-extrusion feedblock in accordance with claim 7 wherein a level gauge is positioned below the interior of said compounding chamber.

9. A three-layer co-extrusion feeding system as set forth in claim 1, further comprising a control unit, wherein the control unit is respectively connected to the raw material storage unit, the pneumatic conveying unit, the mixing unit and the quantitative member, and the raw material storage unit, the pneumatic conveying unit, the mixing unit and the quantitative member are controlled by the control unit in a linkage manner.

10. A three-layer co-extrusion feeding system as set forth in claim 9, wherein the raw material storage unit, the pneumatic conveying unit, the mixing unit and the dosing member are provided in plural sets, and feeding and mixing are performed simultaneously in plural lines.