CN215703948U

CN215703948U - Exhaust type gradual change double-screw device for starch resin synthesis

Info

Publication number: CN215703948U
Application number: CN202121270734.3U
Authority: CN
Inventors: 缪铭; 叶蕾; 支朝晖; 张涛; 金征宇
Original assignee: Jiangnan University
Current assignee: Jiangnan University
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2022-02-01
Anticipated expiration: 2031-06-07

Abstract

The utility model discloses an exhaust type gradual-change double-screw device for starch resin synthesis, and belongs to the technical field of starch resin synthesis. The exhaust type gradual-change double-screw device for starch resin synthesis comprises a motor, a reduction gearbox and a charging barrel, wherein two screws are arranged in the charging barrel, the motor is connected with the reduction gearbox, an output shaft of the reduction gearbox is respectively connected with the two screws, the two screws are mutually meshed, and the rotating directions of the two screws are opposite; the charging barrel is provided with two feeding holes, and a hopper is arranged above the feeding holes; the screw rod is equipped with first helical blade, stirring vane, second helical blade and third helical blade from a left side to a right side in proper order. According to the utility model, the two screws are used for simultaneously realizing mixing and conveying, kneading and plasticizing, exhaust adjusting and conveying molding of the materials, so that the mixing effect of the materials is effectively increased, the effect of multi-component blending is achieved, the refining efficiency of the materials is improved, and the energy consumption is reduced.

Description

Exhaust type gradual change double-screw device for starch resin synthesis

Technical Field

The utility model relates to an exhaust type gradual-change double-screw device for starch resin synthesis, and belongs to the technical field of starch resin synthesis.

Background

Degradable materials produced by conversion of natural renewable starches as raw materials are receiving more and more attention and show a rapidly growing trend. The development and utilization of starch-based materials in China are still in the beginning stage, and compared with the international advanced level, the differences exist in the aspects of product performance, manufacturing cost, key technology, industrialization scale and the like. The extrusion reaction in the synthesis of the starch resin is used as a processing method with the comprehensive effects of temperature, pressure and shearing, and is an important processing means for the synthesis, modification and toughening of the starch resin at present. The existing extruder for starch resin synthesis is generally a single feed opening, two or three groups or even more materials are mixed and fed together, so that various materials cannot be refined separately, the feeding of the materials is complicated, the refining time is long, and the productivity is low.

SUMMERY OF THE UTILITY MODEL

[ problem ] to

The utility model aims to solve the problems that: the existing extruder for starch resin synthesis can not realize separate refining of various materials, and has the disadvantages of complicated material feeding, long refining time and low productivity.

[ solution ]

The utility model provides an exhaust type gradual-change double-screw device for starch resin synthesis, which is suitable for starch resin synthesis, can be used for separately refining various materials and preparing the materials in one step, and has high refining efficiency and high productivity.

The exhaust type gradual-change double-screw device for starch resin synthesis comprises a motor, a reduction gearbox and a charging barrel, wherein two screws are arranged in the charging barrel, the motor is connected with the reduction gearbox, an output shaft of the reduction gearbox is respectively connected with the two screws, the two screws are mutually meshed, and the rotating directions of the two screws are opposite; the charging barrel is provided with two feeding holes, and a hopper is arranged above the feeding holes; the screw is provided with a first helical blade, a stirring blade, a second helical blade and a third helical blade.

In one embodiment of the utility model, a screw is provided with at least two stirring blades, which are perpendicular to the axis of the screw.

In one embodiment of the present invention, the two adjacent stirring blades are fixed on the screw in a staggered manner.

In one embodiment of the utility model, the cartridge is further provided with a vacuum vent, which is located above the second helical blade.

In one embodiment of the utility model, the second helical blade rotates in a direction opposite to the direction of rotation of the first helical blade.

In one embodiment of the utility model, the third helical blade has a rotational direction that is the same as the rotational direction of the first helical blade.

In one embodiment of the utility model, the pitch of the third helical blade is smaller than the pitch of the first helical blade.

In one embodiment of the utility model, the length-diameter ratio of the screw is 50-60: 1.

In one embodiment of the utility model, the screw surface is provided with a high performance ceramic coating.

In one embodiment of the utility model, the number of the first helical blade, the second helical blade and the third helical blade is at least two.

[ advantageous effects ]

1. The screw provided by the utility model is provided with the first helical blade, the stirring blade, the second helical blade and the third helical blade, and the two screws are used for simultaneously realizing the mixing conveying, kneading plasticizing, exhaust adjusting and conveying forming of materials, so that the mixing effect of the materials is effectively increased, the effect of multi-component blending is achieved, and the refining efficiency of the materials is improved.

2. The vacuum vent holes arranged in the utility model realize that the starch resin synthesis process is degassing refining, on one hand, residual moisture in starch is removed, the mechanical property of the starch-based material is improved, on the other hand, the residual chemical modifier in the reactive extrusion process is removed, and the safety quality and the quality of the product are improved.

3. The utility model adopts the exhaust type gradual change double-screw device, which not only can improve the processing adaptability of the extruder, but also can be applied to various processing modes of industrial production of thermoplastic starch, starch-based composite materials, esterified starch, etherified starch and the like.

4. The front end of the screw is provided with the hopper, so that the front end materials are independently mixed, and when the materials enter the next hopper, the third material is added to be mixed with the first two materials, so that the effect of multi-component mixing is achieved; on the other hand, the materials can be fed according to the time, so that the blend can be prepared more efficiently; the method has the advantages that two-step or even multi-step mixing is integrated into a one-step method, so that the problems of energy consumption and repeated mixing of materials are reduced, the complexity of repeated feeding of the materials is reduced, the time can be effectively controlled, the time for discharging and receiving materials is reduced, and the productivity is greatly improved.

5. The surface of the screw is provided with the high-performance ceramic coating, so that the wear resistance and fatigue resistance of metal are greatly improved, the difficult problems of hardening deformation and easy corrosion of the metal are solved, and the service life of the screw is prolonged by more than 1 time.

Drawings

FIG. 1 is a front view of a vented twin-screw gradual change apparatus for starch resin synthesis according to the present invention.

FIG. 2 is a top view of the vented twin-screw gradual change apparatus for starch resin synthesis of the present invention.

In the figure, 1, a motor; 2. a reduction gearbox; 3. a screw; 4. a feed inlet; 5. a first helical blade; 6. a stirring blade; 7. a second helical blade; 8. a third helical blade; 9. a hopper; 10. a vacuum vent; 11. a barrel.

Detailed Description

In order to achieve the above objects, features and advantages and to make the utility model more comprehensible, the present invention is described in detail with reference to the following embodiments.

Example 1

An exhaust type gradual-change double-screw device for starch resin synthesis is shown in figure 1 or 2 and comprises a motor 1, a reduction gearbox 2 and a charging barrel 11, wherein two screws 3 are arranged in the charging barrel 11, the motor 1 is connected with the reduction gearbox 2, an output shaft of the reduction gearbox 2 is respectively connected with the two screws 3, the two screws 3 are mutually meshed, and the rotating directions of the two screws 3 are opposite. Two feed inlets 4 have been seted up to feed cylinder 11, feed inlet 4 top is equipped with hopper 9.

The screw rod 3 is provided with a first helical blade 5, a stirring blade 6, a first helical blade 5, a second helical blade 7, a third helical blade 8, a second helical blade 7 and a third helical blade 8 from left to right in sequence. The first helical blade 5 is used for mixing and conveying materials; one screw rod 3 is provided with at least two stirring blades (6), the stirring blades (6) are perpendicular to the axis of the screw rod (3), two adjacent stirring blades 6 are fixed on the screw rod 3 in a staggered mode, and the stirring blades 6 on the two screw rods 3 are meshed with each other, so that kneading and plasticizing of materials are realized. The charging barrel 11 is further provided with a vacuum exhaust hole 10, the vacuum exhaust hole 10 is located above the second spiral blade 7, the rotating direction of the second spiral blade 7 is opposite to that of the first spiral blade 5, the second spiral blade 7 is used for adjusting material conveying, and the second spiral blade 7 is matched with the vacuum exhaust hole 10 to enable the material in the charging barrel 11 to be exhausted and adjusted. The rotating direction of the third helical blade 8 is the same as that of the first helical blade 5, the pitch of the third helical blade 8 is smaller than that of the first helical blade 5, and the third helical blade 8 is used for realizing the conveying and forming of materials.

Further, the length-diameter ratio of the screw 3 is 50-60: 1.

Furthermore, the surface of the screw rod 3 is provided with a high-performance ceramic coating, so that the wear resistance and fatigue resistance of metal are greatly improved, the difficult problems of hardening deformation and easy corrosion of metal are solved, and the service life of the screw rod 3 is prolonged by more than 1 time.

The utility model effectively increases the mixing effect of the materials, the hopper 9 is arranged at the front end of the screw 3, the purpose is to mix the materials at the front end separately, when the materials enter the next hopper 9, the third material is added to be mixed with the first two materials, and the effect of multi-component mixing is achieved. On the other hand, the materials can be fed according to the time, so that the mixture can be prepared more efficiently. The method has the advantages that two-step or even multi-step mixing is integrated into a one-step method, so that the problems of energy consumption and repeated mixing of materials are reduced, the complexity of repeated feeding of the materials is reduced, the time can be effectively controlled, the time for discharging and receiving materials is reduced, and the productivity is greatly improved.

The scope of the present invention is not limited to the above embodiments, and any modifications, equivalent substitutions, improvements, etc. that can be made by those skilled in the art within the spirit and principle of the inventive concept should be included in the scope of the present invention.

Claims

1. The exhaust type gradual-change double-screw device for starch resin synthesis is characterized by comprising a motor (1), a reduction gearbox (2) and a charging barrel (11), wherein two screws (3) are arranged in the charging barrel (11), the motor (1) is connected with the reduction gearbox (2), an output shaft of the reduction gearbox (2) is respectively connected with the two screws (3), the two screws (3) are mutually meshed, and the rotating directions of the two screws (3) are opposite; the charging barrel (11) is provided with two feeding holes (4), and a hopper (9) is arranged above the feeding holes (4); the screw rod (3) is provided with a first helical blade (5), a stirring blade (6), a second helical blade (7) and a third helical blade (8).

2. The vented progressive twin-screw device for starch resin synthesis according to claim 1, wherein one screw (3) is provided with at least two stirring blades (6), and the stirring blades (6) are perpendicular to the axis of the screw (3).

3. The vented progressive twin-screw device for starch resin synthesis according to claim 2, wherein the two adjacent stirring blades (6) are fixed on the screw (3) in a staggered manner.

4. The vented progressive twin-screw device for starch resin synthesis according to claim 3, wherein the barrel (11) is further provided with a vacuum vent (10), and the vacuum vent (10) is positioned above the second helical blade (7).

5. The vented progressive twin-screw apparatus for starch resin synthesis according to claim 4, wherein the second helical blade (7) rotates in the opposite direction to the first helical blade (5).

6. The vented progressive twin-screw apparatus for starch resin synthesis according to claim 5, wherein the third helical blade (8) rotates in the same direction as the first helical blade (5).

7. The vented progressive twin-screw apparatus for starch resin synthesis according to claim 6, wherein the pitch of the third helical blade (8) is smaller than the pitch of the first helical blade (5).

8. The exhaust-type gradual-change double-screw device for starch resin synthesis as claimed in claim 7, wherein the length-diameter ratio of the screw (3) is 50-60: 1.

9. The vented gradient twin-screw device for starch resin synthesis as claimed in claim 8, wherein the surface of the screw (3) is provided with a high-performance ceramic coating.

10. The vented progressive twin-screw apparatus for starch resin synthesis according to any one of claims 1 to 9, wherein the number of the first helical blade (5), the second helical blade (7) and the third helical blade (8) is at least two.