CN206066912U - Conical double screw extruder with dynamic continuous mixing function - Google Patents

Abstract

This utility model discloses the conical double screw extruder with dynamic continuous mixing function.Cone-type spiral rotor section with respective eccentric axis is set on the screw rod of incorgruous conical double screw extruder, during engagement rotation incorgruous using two helical rotors, rotor is changed from small to big with screw rod rotational periodicity from large to small again with the gap in material tube inner wall face, the radial direction back lash of two rotors and axial back lash, make material in cone-type spiral rotor section axial circulation continuous mixing, strengthen the plasticizing mixing of material.During two cone rotor engagement rotation of this utility model, include material to be conveyed by dynamic plasticizing extruding with the gap in stator inner wall face, the radial direction back lash of two rotors and axial back lash cyclically-varying with rotor, the characteristics of with melting effect and product quality, expansion material application scope etc. is improved.

Description

Conical twin-screw extruder with dynamic continuous mixing function

technical field

The utility model relates to a screw extruder, in particular to a conical twin-screw extruder with the function of dynamic continuous banburying, belonging to the field of polymer material mixing and processing, and the screw extruder can be applied to petroleum, chemical industry , rubber, plastic, food, pharmaceutical and other industries.

Background technique

The conical twin-screw extruder has unique advantages in processing temperature and shear-sensitive polymer materials. It has the advantages of forced conveying of materials, narrow distribution of material residence time, good self-cleaning performance, and is suitable for powder processing. The traditional conical twin-screw extruder mainly uses the gap and relative movement between the screw and the barrel to apply shear to the material, melt and plasticize it at a certain temperature, and then stir and push the mixture through the screw. forward movement. The structure of the screw in the conical twin-screw extruder widely used at present is generally provided with multi-section flights on the screw body, which respectively realize the functions of feeding, splitting, compressing, exhausting and homogenizing. The conical twin-screw extruder using the above-mentioned screw is suitable for processing heat-sensitive plastics such as polyvinyl chloride (PVC for short) materials, while for other polymer materials such as polyolefin materials, the above-mentioned screw often leads to poor processing of materials. Plasticizing and kneading. In order to improve the plasticizing and mixing ability of the conical twin-screw, it is generally added to the conical screw to achieve high-strength shearing mixing elements to enhance its plasticizing and mixing effect, but it is easy to cause some shear-sensitive materials The degradation of the molecular chain reduces the performance of the material itself.

Therefore, if the plasticizing and mixing ability of the conical twin-screw extruder can be greatly improved while avoiding material degradation caused by high-strength shearing, and the material adaptability of the conical twin-screw extruder can be broadened, then for twin-screw extrusion It is of great significance to the machine industry and even the entire polymer material processing field.

Utility model content

The purpose of this utility model is to overcome the problems existing in the prior art, and provide a conical twin-screw extruder with dynamic continuous banburying function to solve the problem of weak mixing ability and material application range of traditional conical twin-screw extruders. Narrow issues.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: a conical twin-screw extruder with dynamic continuous mixing function. Conical helical rotor section, when the two helical rotors rotate in different directions, the gap between the rotor and the inner wall of the barrel, the radial meshing gap and the axial meshing gap between the two rotors periodically change from large to small and then small to small as the screw rotates. Large, so that the material is continuously mixed in the axial circulation of the conical spiral rotor section, and the plasticizing and mixing of the material is strengthened.

Conical twin-screw extruder with dynamic continuous mixing function, the device is mainly composed of a barrel, a first conical screw and a second conical screw placed in the barrel; the first conical screw and the second conical screw The screws rotate in different directions and mesh; the middle positions of the plasticizing sections of the first conical screw and the second conical screw are respectively provided with a first conical helical rotor segment and a second conical helical rotor segment eccentric to their respective rotation axes. The second helical rotor section is connected with the front and rear helical plasticizing sections of the first and second conical screws through a transition cone; the outer surfaces of the first and second conical rotors are conical eccentric meshing ribs that are concentric with the conical rotor axis structure, and the outer cone angle of the convex structure on the surface of the conical rotor is equal to the outer cone angle of the conical screw; the rotation axes of the first and second conical helical rotor segments are fixed and coaxial with the conical screw. , The center line of the second conical helical rotor is parallel to their respective rotation axes and there is a certain amount of eccentricity, the eccentricity is greater than 0 but less than the difference between the radius of the inner cavity of the barrel and the radius of the rib structure surface of the conical helical rotor, the first The conical helical rotor and the second conical helical rotor are arranged in the same horizontal eccentric direction.

Both the first conical helical rotor and the second conical helical rotor are provided with three conical prisms in the same arrangement, and the first helical rotor is respectively provided with a first conical helical prism, a first triangular conical prism a prism and a second triangular conical prism; the second helical rotor is respectively provided with a second helical conical prism, a third triangular conical prism and a fourth triangular conical prism; the second A conical spiral prism and the second conical spiral prism are axial helical bodies around the tapered outer surface of the rotor; the first triangular conical prism and the second triangular conical prism and the third The triangular conical protruding body and the fourth triangular conical protruding body are respectively arranged at both ends of the conical rotor, and the apexes are relatively staggered; the first conical conical protruding body on the first conical spiral rotor The conical spiral prism, the first triangular conical prism and the second triangular conical prism are respectively connected with the second spiral conical prism on the second conical spiral rotor, the third triangular cone The gap formed by the triangular prism and the fourth triangular conical prism engages.

A conical twin-screw extruder with dynamic continuous internal mixing function. The conical screw rotor section can be set in one, two or more stages in the conical screw plasticizing and mixing section according to processing requirements.

The middle position of the plasticizing section of the conical screw in the utility model is provided with a conical helical rotor section eccentric to the screw rotation axis. In the helical rotor section, when the conical twin-screws rotate in different directions, the gap between the rotor and the inner wall of the barrel, the radial meshing gap and the axial meshing gap between the two rotors periodically change from large to small and then from small to large, so that the material The volume of the place also follows the periodic change from large to small and then from small to large, and the material is repeatedly subjected to the action of the shear force field and the tensile force field to be plasticized and homogenized, so that the plasticized and mixed continuous mixing process of the material is obtained. strengthen.

The utility model adopts a conical twin-screw extruder with the function of dynamic continuous banburying, which solves the problems of the traditional conical twin-screw extruder such as weak mixing ability and narrow application range of materials, and is different from the traditional conical twin-screw extruder. Compared with the screw extruder, it has the following advantages:

1) The material adaptability is greatly improved, and various polymer materials including heat-sensitive materials can be processed.

2) The material mixing process is continuous, the processing process is steadily improved, and the energy consumption is reduced;

3) While avoiding material degradation, the material dispersion and mixing effect is greatly improved, and the product performance is improved.

Description of drawings

Fig. 1 is the structural representation of the conical twin-screw extruder with dynamic continuous banburying function;

Fig. 2 is A--A to sectional view of Fig. 1;

Fig. 3 is a partial view of the eccentric conical helical rotor structure of Fig. 1;

Fig. 4 is the structural schematic diagram of the conical twin-screw extruder of two sections of conical screw plasticizing mixing section;

Fig. 5 is a structural schematic diagram of a conical twin-screw extruder in a three-stage conical screw plasticizing and mixing section.

The figure shows: first conical screw I, second conical screw II, barrel III, second conical helical rotor segment IV, first conical helical rotor segment V, fourth conical helical rotor segment VI, The third conical helical rotor segment VII, the sixth conical helical rotor segment VIII, the fifth conical helical rotor segment IX, the third transition cone surface 1, the third triangular conical convex body 2, the meshing gap 3, the Second gap 4, center line of the second conical spiral rotor section 5, second conical screw II rotation axis 6, fourth triangular conical convex prism 7, second conical spiral convex prism 8, fourth transition cone Surface 9, second transition cone surface 10, second triangular conical prism 11, first conical helical rotor section centerline 12, first helical conical prism 13, first gap 14, first triangular Conical convex prism body 15, first conical screw rotation axis 16, first transitional conical surface 17, meshing gap 18.

detailed description

In order to better understand the utility model, the utility model will be further described below in conjunction with the accompanying drawings and the examples, but the protection scope of the utility model is not limited to the range described in the examples.

Example 1

As shown in Figure 1, Figure 2, and Figure 3, the conical twin-screw extruder with dynamic continuous mixing function is mainly composed of barrel III, the first conical screw I and the second conical screw placed in barrel III Composed of conical screw II; the first conical screw I and the second conical screw II rotate in different directions; the feeding helical sections of the first conical screw I and the second conical screw II are respectively set with the first conical screw The screw rotation axis 16 and the second conical screw II rotation axis 6 are eccentric to the first conical helical rotor segment V and the second conical helical rotor segment IV; the first conical helical rotor segment V passes through the first transition cone surface 17 and The feed screw section of the first conical screw I is connected to the discharge screw section of the first conical screw I through the second transition cone 10; the second conical screw rotor section IV is connected to the third transition cone 1 through the second transition cone 10. The feed screw section of the second conical screw II is connected to the discharge screw section of the second conical screw II through the fourth transition cone 9; the first conical helical rotor section V and the second conical helical rotor section The outer surface of IV is a conical meshing rib structure that is eccentric to the rotation axis 16 of the first conical screw and the rotation axis 6 of the second conical screw II, and the first conical helical rotor segment V and the second conical helical rotor The outer cone angle of the rib structure on the rotor surface of section IV is equal to the outer cone angle of the first conical screw I and the second conical screw II; the rotation of the first conical helical rotor section V and the second conical helical rotor section IV The axis is fixed and coaxial with the rotation axis 16 of the first conical screw and the rotation axis 6 of the second conical screw II; the centerline 12 of the first conical helical rotor segment V and the centerline 5 of the second conical helical rotor segment IV They are respectively parallel to the rotation axis 16 of the first conical screw I and the rotation axis 6 of the second conical screw II, and there is an eccentricity e, and the eccentricity e is greater than 0 but smaller than the radius of the inner cavity of the barrel III and the first conical screw rotor section V Or the difference between the surface radii of the rib structure of the second conical helical rotor segment IV, and the horizontal eccentric directions of the first conical helical rotor segment V and the second conical helical rotor segment IV are the same.

The first conical helical rotor section V and the second conical helical rotor section IV are all provided with three conical convex prisms arranged in the same way; The prism 13, the first triangular conical prism 15 and the second triangular conical prism 11; the second conical spiral rotor segment IV is respectively provided with the second conical spiral prism 8, the third triangular Conical convex prism 2 and the fourth triangular conical convex prism 7; The outer surface of the second helical rotor section IV is spirally arranged in the axial direction; the first triangular conical prism 15 and the second triangular conical prism 11 are respectively arranged at both ends of the first conical helical rotor section V, and the second The three triangular conical convex prisms 2 and the fourth triangular conical convex prisms 7 are respectively arranged at the two ends of the second conical spiral rotor segment IV, the first triangular conical convex prisms, the second triangular conical convex prisms Shaped prism, the third triangular conical prism and the fourth triangular conical prism are triangular conical prisms whose vertices are relatively staggered; The space between the third triangular conical convex prism 2 and the fourth triangular conical convex prism 7 on the second conical spiral rotor segment 13 and the second conical spiral convex prism 13 forms gap engagement; Between the second conical helical prism 8 on the conical helical rotor section IV and the first triangular conical prism 15 and the second triangular conical prism 11 on the first conical helical rotor section V The space between them forms gap meshing; when the first conical screw I and the second conical screw II are meshed and rotated in different directions, the first conical helical rotor segment V and the second conical helical rotor segment are engaged and rotated, resulting in a change in the relative position in the eccentric direction Changes, so that the first gap 14 and the second gap 4 formed between the first conical helical rotor segment V and the second conical helical rotor segment IV and the inner wall of the barrel III periodically change from large to small and then from small to small. Great change, simultaneously the first conical helical prism 13 on the first conical helical rotor section V and the third triangular conical prism 2 and the fourth triangular conical prism on the second conical helical rotor section IV The meshing gap 18 formed by the space between the shaped prisms 7, and the second conical helical prism 8 on the second conical helical rotor segment IV and the first triangular shape on the first conical helical rotor segment V The meshing gap 3 formed by the space between the tapered prism body 15 and the second triangular-shaped prism body 11 also periodically changes from large to small and then from small to large. Due to the space between the first conical helical rotor segment V, the second conical helical rotor segment IV and the inner wall of the barrel III, and the space when the first conical helical rotor segment V and the second conical helical rotor segment IV are engaged in clearance, both In the periodic change from large to small and from small to large, the material in it also changes periodically from small to large and then from large to small during the flow and deformation process, so the velocity gradient of the material is consistent with its flow and deformation direction , this kind of flow and deformation is mainly dominated by the tensile force field, which makes the material exhibit tensile rheological behavior, which can greatly improve the plasticizing effect of the material in banburying.

Example 2

As shown in Figure 4, similar to Example 1, a conical twin-screw extruder with dynamic continuous mixing function was formed. The difference is that: on the first conical screw I, a third conical screw rotor segment VII is added after the first conical screw rotor segment V along the extrusion direction; on the second conical screw II, along the extrusion direction, the second After the conical helical rotor section IV, the fourth conical helical rotor section VI is added; the third conical helical rotor section VII and the fourth conical helical rotor section VI are connected with the first conical helical rotor section V and the second conical helical rotor section The structure and working process of the rotor section IV are the same. Setting two sections of conical helical rotor section on the conical screw can strengthen the material distribution and mixing, and improve the plasticizing efficiency.

Example 3

As shown in Figure 5, similar to Example 1 and Example 2, a conical twin-screw extruder with dynamic continuous mixing function was formed. The difference is that the fifth conical screw rotor segment IX is added after the first conical screw rotor segment V and the third conical screw rotor segment VII along the extrusion direction on the first conical screw I; the second conical screw On II, the sixth conical helical rotor segment VIII is added after the second conical helical rotor segment IV and the fourth conical helical rotor segment VI along the extrusion direction; the fifth conical helical rotor segment IX and the sixth conical helical rotor segment The structure and working process of the rotor section VIII are the same as those of the first conical helical rotor section V, the third conical helical rotor section VII, the second conical helical rotor section IV and the fourth conical helical rotor section VI respectively. Setting three or more conical helical rotor segments on the conical screw can be more conducive to material distribution and mixing, plasticization and homogenization.

Claims (5)

1. there is the conical double screw extruder of dynamic continuous mixing function, it is characterised in that：Extrude in incorgruous conical double-screw Cone-type spiral rotor section with respective eccentric axis is set on the screw rod of machine, during engagement rotation incorgruous using two helical rotors, is turned Son is with the gap in material tube inner wall face, the radial direction back lash of two rotors and axial direction back lash with screw rod rotational periodicity by becoming greatly It is little to change from small to big again, make material in cone-type spiral rotor section axial circulation continuous mixing, strengthen the plasticizing mixing of material.

2. the conical double screw extruder of dynamic continuous mixing function according to claim 1, it is characterised in that：The cone Shape double screw extruder is mainly made up of machine barrel, the first conical screw being placed in machine barrel and the second conical screw；First taper Screw rod and the engagement of the second conical screw counter rotating；At least divide after the feed auger section of the first conical screw and the second conical screw She Zhi not be with the first cone-type spiral rotor section of II rotation axis off-center of the first conical screw rotation axiss and the second conical screw With the second cone-type spiral rotor；First cone-type spiral rotor section passes through the feed auger of the First Transition conical surface and the first conical screw Section connection, is coupled with the discharging spiral section of the first conical screw by the second transition conical surface；Second cone-type spiral rotor section passes through The 3rd transition conical surface is coupled with the feed auger section of the second conical screw, by going out for the 4th transition conical surface and the second conical screw Material spiral section connection；First cone-type spiral rotor section V and the second cone-type spiral rotor outer surface are and are revolved with the first conical screw The taper engagement type fin structure of shaft axis and the second conical screw rotation axis off-center, and the first cone-type spiral rotor section and The outside cone angle of the rotor surface fin structure outside cone angle and the first conical screw and the second conical screw of two taper helical rotor sections It is equal；The rotation axiss of the first cone-type spiral rotor section and the second cone-type spiral rotor section fix and with residing first conical screw Rotation axiss and the second conical screw rotation axiss are coaxial；First cone-type spiral rotor section centrage and the second cone-type spiral rotor Section centrage is parallel with the first conical screw rotation axiss and II rotation axiss of the second conical screw respectively and there is offset, partially Heart amount is more than 0 and is less than the fin knot of III inner chamber radius of machine barrel and the first cone-type spiral rotor section or the second cone-type spiral rotor section The difference of structure surface radius, and the horizontal eccentric direction of the first cone-type spiral rotor section and the second cone-type spiral rotor section is identical；

First cone-type spiral rotor section and the second cone-type spiral rotor section are equipped with arrangement three pieces of taper fin bodies of identical；Its In, the first cone-type spiral rotor section is respectively equipped with the first helicon fin body, the first triangular shape taper fin body and the two or three Horn shape taper fin body；It is convex that second cone-type spiral rotor section is respectively equipped with the second cone-type spiral fin body, the 3rd triangular shape taper Rib body and the 4th triangular shape taper fin body；First cone-type spiral fin body and the second cone-type spiral fin body are rotating around taper First helical rotor section and the second helical rotor section outer surface axial screw arrangement；First triangular shape taper fin body and the two or three Horn shape taper fin body is separately positioned on the two ends of the first cone-type spiral rotor section, the 3rd triangular shape taper fin body and the four or three Horn shape taper fin body is separately positioned on the two ends of the second cone-type spiral rotor section, the first triangular shape taper fin body, the two or three Horn shape taper fin body, the 3rd triangular shape taper fin body and the 4th triangular shape taper fin body are summit staggered relative distribution Triangular shape taper fin body；The first cone-type spiral fin body and the second cone-type spiral on first cone-type spiral rotor section turns Space between the 3rd triangular shape taper fin body and the 4th triangular shape taper fin body in subsegment forms clearance meshing；Second The second cone-type spiral fin body on cone-type spiral rotor section is convex with the first triangular shape taper on the first cone-type spiral rotor section Space between rib body and the second triangular shape taper fin body forms clearance meshing；First conical screw and the second conical screw are different When engagement rotation, the first cone-type spiral rotor section and the second cone-type spiral rotor section engage rotation causes the relative position of eccentric direction The change put so that first formed between the first cone-type spiral rotor section and the second cone-type spiral rotor section and machine tube inner wall face Gap and the second gap are in change of periodically changing from small to big again from large to small, while the first cone on the first cone-type spiral rotor section The 3rd triangular shape taper fin body and the 4th triangular shape taper fin on shape spiral ridge body and the second cone-type spiral rotor section The back lash that space between body is formed, and the second cone-type spiral fin body and first on the second cone-type spiral rotor section What the space between the first triangular shape taper fin body and the second triangular shape taper fin body on cone-type spiral rotor section was formed Back lash is also in change of periodically changing from small to big again from large to small.

3. the conical double screw extruder with dynamic continuous mixing function according to claim 2, it is characterised in that：Institute State the first conical screw and the second conical screw multistage cone-type spiral rotor section is provided with along extrusion direction.

4. the conical double screw extruder with dynamic continuous mixing function according to claim 3, it is characterised in that：Institute State triconic helical rotor section is set up along extrusion direction after the first cone-type spiral rotor section on the first conical screw；Second The 4th cone-type spiral rotor section is additionally arranged along extrusion direction after the second cone-type spiral rotor section on conical screw II；Third hand tap The knot of shape helical rotor section and the 4th cone-type spiral rotor section and the first cone-type spiral rotor section and the second cone-type spiral rotor section Structure is identical.

5. the conical double screw extruder with dynamic continuous mixing function according to claim 4, it is characterised in that：Institute State the 5th cone is set up along extrusion direction after the first cone-type spiral rotor section, triconic helical rotor section on the first conical screw Shape helical rotor section；Along extrusion direction in the second cone-type spiral rotor section, the 4th cone-type spiral rotor section on second conical screw The 6th cone-type spiral rotor section is set up afterwards；5th cone-type spiral rotor section and the 6th cone-type spiral rotor section are bored with first respectively Shape helical rotor section and triconic helical rotor section and the second cone-type spiral rotor section and the 4th cone-type spiral rotor section Structure is identical.