A sealing sleeve for an extensional rheological extruder

Abstract

The invention discloses a sealing sleeve of a stretching rheological extruder. The sealing sleeve comprises a main sleeve body, the main sleeve body is provided with a through hole, and the through hole is eccentrically arranged; the main sleeve body is provided with a first spiral push groove, and the rotation direction of the first spiral push groove is opposite to the rotation direction; the through hole is provided with a second spiral push groove, and the rotation direction of the second spiral push groove is the same as the rotation direction; a connecting part, the connecting part is fixed to the main sleeve body, the connecting part is connected to the driving structure, the main sleeve body is arranged in the installation cavity, and the sealing sleeve rotates with the stator; a rotor, the rotor is provided with a connecting column, and the rotor is connected to the driving structure. It can avoid the long-term accumulation of raw materials, thereby preventing the accumulated materials from being pushed out after turning black and yellow to reduce the quality of the product, and can avoid the raw materials from flowing back to the gear box, which can effectively protect the gear box.

Description

Technical Field

[0001] The invention relates to the technical field of extruders, in particular to a sealing sleeve of an extensional rheological extruder. Background Art

[0002] The extruder includes a cylindrical stator and a screw-type rotor. The rotor is mounted inside the stator. Driven by a driving device, the rotor is rotatably arranged inside the stator. A feed port and a discharge port are arranged on the stator. Through the cooperation of the rotor and the stator, the material can be pushed and extruded from the feed port to the discharge port.

[0003] The sealing of the rotor and stator of an existing single-screw extruder is usually achieved by a step, that is, the rear end of the rotor has a step-like structure, and the stator is provided with a chamber for the step-like structure to rotate, and the front end face of the chamber abuts against the front end face of the step-like structure of the rotor to achieve the sealing of the rotor and the stator.

[0004] However, the sealing effect of this method is poor and cannot meet the sealing requirements of the rotor in the working state of combining self-rotation and swing. Due to the design tolerance of the step-shaped structure of the rotor and the chamber of the stator, the powdered raw materials or molten raw materials can easily pass through the gap between the rotor and the stator, causing the raw materials to flow back. After the raw materials flow back, they will stick to a certain place, causing the raw materials to accumulate. Since the accumulation place has a small space and the heat cannot be dissipated, the accumulated materials are easy to become burnt and black. After a long period of accumulation, they are easy to be pushed out, causing the parts produced to turn black and yellow locally, affecting the production yield, or the raw materials may flow back to the gearbox after a long period of accumulation, reducing the transmission accuracy of the gearbox or even damaging the gearbox. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a sealing sleeve for an extensional rheological extruder to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0006] The solution of the present invention to solve its technical problem is:

[0007] A sealing sleeve of an extensional rheological extruder is provided with a rotation direction and a rotation axis, and the sealing sleeve comprises:

[0008] A main sleeve body, wherein the main sleeve body is provided with a through hole, the through hole is a circular hole, the through hole penetrates the main sleeve body in the front and back direction, and the through hole is eccentrically arranged at the rotation axis; a first spiral push groove is provided on the outer wall surface of the main sleeve body, and the rotation direction of the first spiral push groove is opposite to the rotation direction; a second spiral push groove is provided on the wall surface of the through hole, and the rotation direction of the second spiral push groove is the same as the rotation direction;

[0009] A connecting portion is fixedly connected to the rear end of the main sleeve.

[0010] Through the above technical solution, the connecting part is connected to the driving assembly in the gearbox of the extruder, so that the sealing sleeve rotates together with the extruder rotor, and the sealing sleeve rotates in the opposite direction to the extruder rotor. The rotation direction of the first spiral pusher groove is opposite to the rotation direction, so that when the main sleeve rotates, the raw material that flows back to the stator and the main sleeve will be pushed forward due to the action of the first spiral pusher groove; when in use, since the main sleeve and the extruder rotor rotate in the opposite direction, the inner wall of the through hole and the extruder rotor have relative motion, so that the material in the second spiral pusher groove can be smoothly pushed out due to the friction, and the second spiral pusher groove can make the raw material that flows back to the rotor and the sealing sleeve be pushed forward, and the raw material pushed forward can re-enter the extrusion flow channel and be pushed forward by the rotor to avoid long-term accumulation of raw materials, thereby avoiding the accumulated materials from turning black and yellow and being pushed out to reduce the quality of the product, and avoiding the raw materials from flowing back to the gearbox, which can effectively protect the gearbox.

[0011] As a further improvement of the above technical solution, the front end of the main sleeve body is provided with an inclined portion, and the diameter of the outer wall surface of the inclined portion gradually decreases from the back to the front.

[0012] Through the above technical solution, the setting of the inclined portion makes it easier for the raw material to be pushed forward, so that the raw material can more easily re-enter the extrusion flow channel of the extruder, which can reduce the accumulation of backflow raw material in the installation cavity to a certain extent.

[0013] As a further improvement of the above technical solution, a notch is provided at the front end of the main sleeve.

[0014] Through the above technical scheme, the raw materials pushed forward by the backflow can be accumulated at the notch, and the raw materials accumulated at the notch can more easily re-enter the extrusion flow channel of the extruder, and the raw materials accumulated at the notch will move with the notch, which can avoid the raw materials from sticking to a certain position for a long time and causing them to become charred and black, thereby ensuring the quality of the final extruded product. At the same time, the notch also provides a larger space for the raw materials to move, so that the backflowing raw materials can more easily re-enter the extrusion flow channel of the extruder.

[0015] As a further improvement of the above technical solution, there are multiple notches, and the multiple notches are arranged circumferentially around the rotation axis.

[0016] Through the above technical solution, multiple gaps can improve the efficiency of re-introducing countercurrent raw materials.

[0017] As a further improvement of the above technical solution, the width of the notch gradually increases from back to front.

[0018] Through the above technical solution, the raw material at the bottom of the gap can be pushed forward more easily.

[0019] As a further improvement of the above technical solution, the notch penetrates the main sleeve body along the radial direction of the main sleeve body.

[0020] Through the above technical solution, the raw material between the rotor and the main sleeve body and the raw material between the main sleeve body and the stator can enter the gap.

[0021] The beneficial effects of the present invention are: it can prevent the raw materials from piling up for a long time, thereby preventing the accumulated materials from turning black and yellow and being pushed out to reduce the quality of the product, and it can prevent the raw materials from flowing back to the gear box, thereby effectively protecting the gear box.

[0022] The invention is used in the technical field of extruders. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0024] Figure 1 is a schematic cross-sectional structural diagram of an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of an exploded structure of an embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of the overall structure of a sealing sleeve according to an embodiment of the present invention;

[0027] Figure 4 It is a schematic cross-sectional structural diagram of a sealing sleeve according to an embodiment of the present invention.

[0028] In the figure, 100, gear box; 200, stator; 210, mounting cavity; 220, extrusion channel; 230, feed hole; 300, rotor; 310, connecting column; 320, extrusion screw; 400, sealing sleeve; 410, main sleeve; 411, through hole; 412, inclined portion; 413, notch; 414, first spiral push trough; 415, second spiral push trough; 420, connecting portion. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other.

[0030] Reference Figures 1 to 4 , an extensional rheology extruder, includes a gear box 100, a stator 200, a rotor 300 and a sealing sleeve 400.

[0031] A driving assembly is installed in the gear box 100 .

[0032] The stator 200 is fixedly connected to the gearbox 100, and a mounting cavity 210 is provided at the rear end of the stator 200. The mounting cavity 210 is a cylindrical cavity structure, and a bevel is provided at the front end of the mounting cavity 210. The stator 200 is also provided with an extrusion channel 220, which is a spiral extension and communicates with the front end of the mounting cavity 210.

[0033] The stator 200 is also provided with a feed hole 230 , which is connected to the extrusion flow channel 220 and the mounting cavity 210 . The feed hole 230 is used to dock with the feed mechanism so that the raw material can enter the stator 200 and be pushed forward.

[0034] The rotor 300 is drivingly connected to the driving assembly, and a connecting column 310 is provided at the rear end of the rotor 300 . The connecting column 310 is a circular columnar structure. The rotor 300 is also provided with an extrusion screw 320 , which is arranged at the front side of the connecting column 310 .

[0035] The driving assembly drives the rotor 300 and the sealing sleeve 400 to rotate. Specifically, the driving assembly is a driving structure that can be formed by combining multiple gears and power sources according to actual needs by those skilled in the art, and will not be described in detail here.

[0036] The driving assembly drives the rotor 300 to rotate around two rotation axes at the same time, wherein one rotation axis is set as a first axis and the other rotation axis is set as a second axis, the first axis is fixed relative to the gear box 100, and the second axis can make a circular motion around the first axis relative to the gear box 100, that is, the rotor 300 rotates around the second axis while making a circular motion around the first axis.

[0037] The sealing sleeve 400 is driven by the driving assembly to rotate around a rotation axis, and has a rotation direction. The rotation axis is arranged to coincide with the first axis.

[0038] The sealing sleeve 400 and the stator 200 and the rotor 300 can rotate relative to each other. The sealing sleeve 400 includes a main sleeve body 410 and a connecting portion 420, the main sleeve body 410 is arranged at the front side of the connecting portion 420, the main sleeve body 410 and the connecting portion 420 are fixedly connected, and specifically, the main sleeve body 410 and the connecting portion 420 are integrally formed.

[0039] The connecting portion 420 is used to be connected to the driving assembly via screws, so that the main sleeve body 410 can be driven by the driving assembly.

[0040] The main sleeve 410 is a cylindrical structure, and is provided with a through hole 411, which penetrates the main sleeve 410 in the front-to-back direction, and is a circular hole structure, and the central axis of the through hole 411 coincides with the second axis, that is, the through hole 411 is eccentrically arranged with the main sleeve 410. The connecting column 310 of the rotor 300 passes through the through hole 411 of the main sleeve 410, and the connecting column 310 and the through hole 411 match, and the two can rotate relatively, and the main sleeve 410 rotates in the opposite direction to the rotor 300.

[0041] The front end of the main sleeve 410 is provided with an inclined portion 412, the diameter of which gradually decreases from the back to the front, and the outer wall surface of the inclined portion 412 matches the inclined surface of the installation cavity 210. The setting of the inclined portion 412 makes it easier for the raw material to be pushed forward, so that the raw material can more easily re-enter the extrusion flow channel 220, and can reduce the accumulation of the reversed raw material in the installation cavity 210 to a certain extent.

[0042] The outer wall surface of the main sleeve 410 is provided with a first spiral push groove 414 (the first spiral push groove 414 in the claims may also refer to an irregular groove body extending forward around the outer wall surface of the main sleeve 410, and the same applies to the second spiral push groove 415 below), and the front end of the first push groove 414 is connected to the outer wall surface of the main sleeve 410, and the rotation direction of the first spiral push groove 414 is opposite to the rotation direction, so that when the main sleeve 410 rotates, the main sleeve 410 and the inner wall of the mounting cavity 210 rotate relative to each other, and the raw material that flows back to between the stator 200 and the main sleeve 410 will be pushed forward due to the action of the first spiral push groove 414. The raw material pushed forward can re-enter the extrusion channel 220 and be pushed forward by the rotor 300 to avoid long-term accumulation of raw materials.

[0043] The wall surface of the through hole 411 of the main sleeve 410 is provided with a second spiral push groove 415, the front end of the second push groove 415 is connected to the outer wall surface of the main sleeve 410, and the rotation direction of the second spiral push groove 415 is opposite to that of the first spiral push groove 414. When the extruder is working, the raw materials accumulated in the first spiral push groove 414 and the second spiral push groove 415 are pushed forward. And because the main sleeve 410 and the rotor 300 rotate in the opposite direction, the inner wall of the through hole 411 and the connecting column 310 have relative movement, so that the material in the second spiral push groove 415 can be smoothly pushed out due to the effect of friction, and the second spiral push groove 415 can make the raw materials that flow back to between the rotor 300 and the sealing sleeve 400 be pushed forward to avoid long-term accumulation of raw materials.

[0044] The front end of the main sleeve 410 is also provided with a notch 413, and the number of the notches 413 is set to be multiple, and the multiple notches 413 are arranged around the rotation axis. By providing the notch 413 at the front end of the main sleeve 410, the raw materials pushed forward due to the backflow can be accumulated at the notch 413, and the raw materials accumulated at the notch 413 are easier to re-enter the extrusion flow channel 220, and the raw materials accumulated at the notch 413 will move with the notch 413, which can avoid the raw materials from sticking to a certain position for a long time and causing them to become burnt and black. When the notch 413 rotates to communicate with the feed hole 230, part of the raw materials in the notch 413 will enter the extrusion flow channel 220 together with the raw materials flowing into the feed hole 230, which can further make it easier for the raw materials to re-enter the extrusion flow channel 220, thereby further avoiding the long-term accumulation of raw materials. The width of the notch 413 gradually increases from the back to the front, so that the raw materials at the bottom of the notch 413 can be more easily pushed forward. The notch 413 penetrates the main sleeve 410 in the radial direction of the main sleeve 410 , so that the raw material between the rotor 300 and the main sleeve 410 and the raw material between the main sleeve 410 and the stator 200 can enter the notch 413 .

[0045] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A sealing sleeve for an extensional rheological extruder, characterized in that: A rotation direction and a rotation axis are provided, and the sealing sleeve comprises: A main sleeve body, wherein the main sleeve body is provided with a through hole, the through hole is a circular hole, the through hole penetrates the main sleeve body in the front and rear direction, and the through hole is eccentrically arranged at the rotation axis; a first spiral push groove is provided on the outer wall surface of the main sleeve body, the rotation direction of the first spiral push groove is opposite to the rotation direction, and a second spiral push groove is provided on the wall surface of the through hole, the rotation direction of the second spiral push groove is the same as the rotation direction; A connecting portion is fixedly connected to the rear end of the main sleeve.

2. The sealing sleeve of an extensional rheological extruder according to claim 1, characterized in that: The front end of the main sleeve body is provided with an inclined portion, and the diameter of the outer wall surface of the inclined portion gradually decreases from the back to the front.

3. The sealing sleeve of the extensional rheological extruder according to claim 1, characterized in that: A notch is arranged at the front end of the main sleeve.

4. The sealing sleeve of the extensional rheological extruder according to claim 3, characterized in that: There are a plurality of the notches, and the plurality of the notches are arranged circumferentially around the rotation axis.

5. The sealing sleeve of the extensional rheological extruder according to claim 3, characterized in that: The width of the notch increases gradually from back to front.

6. The sealing sleeve of an extensional rheological extruder according to claim 3, characterized in that: The notch penetrates the main sleeve body along the radial direction of the main sleeve body.

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