Firmly-sealed extruder screw

Abstract

The utility model relates to the technical field of extruder screws, in particular to a firmly-sealed extruder screw which comprises a screw body and an extruder, the screw body is mounted in the extruder, a power connecting end is arranged at one end of the screw body, and a sealing mounting section, a feeding section, a compression section and a metering section are sequentially arranged at the power connecting end towards the other end. A sealing mechanism is arranged on the sealing mounting section and is used for preventing high-temperature gas from leaking through a gap between the side wall of the sealing mounting section of the screw main body and the side wall of an extruder; the rotating airflow is formed in the sealing cavity through the driven ring under rotation of the screw main body, the airflow is thrown out of the sealing mechanism through the through hole in the inner wall of the sealing cavity, and due to the fact that the gas one-way valve is coaxially arranged on the inner wall of the through hole, high-temperature gas in an extruder cannot enter the sealing cavity through the through hole; high-temperature gas in the extruder is prevented from leaking through a gap between the extruder shell and the sealing mounting section of the screw main body, and the safety of the device is ensured.

Description

Technical Field

[0001] The present application relates to the field of extruder screws, and in particular to an extruder screw with a strong seal. Background Art

[0002] The screw, as the heart of the extruder, has a very important impact on the quality and output of the extruder products. The main functions of a screw are to convey materials, transfer heat to plasticize materials, and mix and homogenize materials. Usually, a conventional full-thread screw is designed into three sections, the first section is the feeding section, the second section is the compression section, and the third section is the homogenization section, also known as the metering section. When installing the extruder screw in the extruder, it is necessary to ensure the sealing between the end of the screw and the side wall of the extruder.

[0003] Referring to the Chinese patent application with publication number CN217752656U, a screw of an extruder with high sealing performance is disclosed. A filling valve is installed on the upper part of the barrel in the middle of the sealing section. When working, a certain amount of lubricating oil or an additive with certain lubricating performance is added to the filling valve. When granulating, the screw rotates, and the sealing ring remains basically stationary. The left and right sides of the sealing ring rub against the side of the ring groove to play a sealing role. The device changes the sealing principle by machining a ring groove in the sealing section to install the sealing ring. The sealing is achieved by relative movement between planes, so that the distance of the sealing section becomes shorter and the sealing effect is better.

[0004] However, in the prior art, a ring groove is machined in the sealing section to install a sealing ring. Due to the different thermal expansion coefficients of various materials, the volume changes caused by temperature changes of different materials are different, which leads to unavoidable gaps in the sealing ring. This method cannot achieve a good sealing effect, especially in the case of high-temperature gas. For this reason, we designed an extruder screw with a strong seal. Utility Model Content

[0005] An extruder screw with a strong seal provided in an embodiment of the present application solves the technical problem by adopting the method.

[0006] The embodiment of the present application provides a firmly sealed extruder screw comprising a screw body and an extruder, wherein the screw body is installed in the extruder, a power connection end is provided at one end of the screw body, and a sealing installation section, a feeding section, a compression section and a metering section are sequentially provided at the power connection end toward the other end, and a sealing mechanism is provided on the sealing installation section, and the sealing mechanism is used to prevent high-temperature gas from leaking through a gap between a side wall of the sealing installation section of the screw body and a side wall of the extruder;

[0007] When there is high-temperature gas in the extruder and the high-temperature gas enters the sealing mechanism through the inner sealing gasket, the driven ring forms a rotating airflow in the sealing cavity under the rotation of the screw body, and the airflow is thrown out of the sealing mechanism through the through hole tangent to the inner wall of the sealing cavity. Since a gas one-way valve is coaxially provided on the inner wall of the through hole, the high-temperature gas in the extruder cannot enter the sealing cavity through the through hole, thereby preventing the high-temperature gas in the extruder from leaking through the gap between the extruder housing and the sealing installation section of the screw body.

[0008] The above technical solutions in the embodiments of the present application have at least the following technical effects:

[0009] 1. In the present application, the driven ring forms a rotating airflow in the sealing chamber under the rotation of the screw body, and the airflow is thrown out of the sealing mechanism through the through hole on the inner wall of the sealing chamber. Since a gas one-way valve is coaxially arranged on the inner wall of the through hole, the high-temperature gas in the extruder cannot enter the sealing chamber through the through hole, thereby preventing the high-temperature gas in the extruder from leaking through the gap between the extruder housing and the sealing installation section of the screw body, thereby ensuring the safety of the device.

[0010] 2. The present application uses a dispersion section to facilitate sufficient dispersion and uniform mixing of the materials entering the metering section trough, thereby ensuring the quality of the materials after melt extrusion molding. The depth of the trough is gradually shallower. At this time, the gap between the trough with a gradually shallower depth and the wall of the extruder barrel gives the material a gradually increasing high shear force. After the solid bed of the material is broken, the remaining material solids or material polymers are elongated, increasing the surface area exposed to the adjacent melt, ensuring that the plastic particles in the melt are fully heated and melted. The excellent dispersibility and high quality have obvious advantages in low viscosity applications.

[0011] In some embodiments, a dispersion section is provided between the compression section and the metering section, a mixing head is provided at one end of the metering section away from the dispersion section, and the power connection end penetrates the side wall of the extruder.

[0012] In some embodiments, the sealing mechanism comprises:

[0013] An outer sealing sleeve shell, the outer sealing sleeve shell is coaxially sleeved on the power connection end, and the outer sealing sleeve shell is fixedly connected to the outer side wall of the extruder;

[0014] An inner sealing sleeve, wherein the inner sealing sleeve is coaxially sleeved on the sealing installation section, the inner sealing sleeve is fixedly connected to the inner side wall of the extruder, and an installation cavity is provided at one end of the outer sealing sleeve and the inner sealing sleeve close to each other, and a clamping groove is provided in the installation cavity;

[0015] A group of fixed collars, each of which is disposed in the mounting cavities of the outer sealing sleeve and the inner sealing sleeve, two groups of clamping blocks are symmetrically disposed at both ends of the fixed collars, the clamping blocks are disposed in the clamping grooves, and a rotation groove is disposed at one end of each of the fixed collars close to each other;

[0016] A driven ring, the driven ring is coaxially arranged in a set of fixed collars, and two ends of the driven ring are respectively rotatably connected to the rotating grooves of the set of fixed collars;

[0017] An inner sealing gasket is coaxially arranged on a surface of the inner sealing sleeve away from the fixed collar, and the inner sealing gasket is in contact with a side wall of the fixed collar.

[0018] In some embodiments, a through hole is obliquely provided on the inner wall of the installation cavity of the inner sealing sleeve, and a gas one-way valve is coaxially provided on the inner wall of the through hole.

[0019] In some embodiments, a group of the clamping blocks are each provided with a second bolt mounting hole, a second mounting bolt is disposed in the second bolt mounting hole, and a side wall of a group of the clamping blocks is in contact with an inner wall of the clamping groove.

[0020] In some embodiments, a sealing ring is provided between the gap between the driven ring and a set of fixed rings.

[0021] In some embodiments, a mounting socket is provided on the power connection end, and a first bolt mounting hole is provided on both the outer sealing sleeve and the inner sealing sleeve, and a first mounting bolt is provided in the first bolt mounting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 A schematic diagram of the structure of a firmly sealed extruder screw provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of an exploded structure of a sealing mechanism of an extruder screw with a strong seal provided in an embodiment of the present application;

[0025] Figure 3 The internal structure of the sealing mechanism of the extruder screw with a strong seal provided in the embodiment of the present application Figure 1 ;

[0026] Figure 4The internal structure of the sealing mechanism of the extruder screw with a strong seal provided in the embodiment of the present application Figure 2 ;

[0027] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of part A in the middle.

[0028] Among them, the reference numerals in the figure are:

[0029] 1. Screw body; 2. Outer sealing sleeve; 3. Inner sealing sleeve; 4. Inner sealing gasket; 5. First bolt mounting hole; 6. First mounting bolt; 7. Clamping groove; 8. Fixed collar; 9. Clamping block; 10. Second bolt mounting hole; 11. Driven ring; 12. Sealing ring; 13. Through hole; 14. Power connection end; 15. Dispersing section; 16. Metering section; 17. Mixing head. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In this application, "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] It should be noted that, in the present application, words such as "in the present embodiment", "exemplarily", "for example", etc. are used to indicate examples, illustrations or explanations. Any embodiment or design described in the present application as "in the present embodiment", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in the present embodiment", "exemplarily", "for example", etc. is intended to present related concepts in a concrete way, meaning that specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the above words in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] As the heart of the extruder, the screw has a very important influence on the quality and output of the extruder products. The main functions of a screw are to convey materials, transfer heat to plasticize materials, and mix and homogenize materials. Usually, a conventional full-thread screw is designed into three sections. The first section is the feeding section, the second section is the compression section, and the third section is the homogenization section, also called the metering section. When the extruder screw is installed in the extruder, it is necessary to ensure the sealing between the screw end and the side wall of the extruder.

[0038] An extruder screw with high sealing performance in the related technology has a filling valve installed on the upper part of the barrel in the middle of the sealing section. During operation, a certain amount of lubricating oil or an additive with certain lubricating performance is added to the filling valve. During granulation, the screw rotates and the sealing ring basically remains stationary. The left and right sides of the sealing ring rub against the side of the ring groove to play a sealing role. The device changes the sealing principle by machining a ring groove in the sealing section to install the sealing ring. The sealing is achieved through relative movement between planes, which shortens the distance of the sealing section and improves the sealing effect.

[0039] Based on this, in order to improve the problem that in the related technology of machining a ring groove in the sealing section to install a sealing ring, due to the different thermal expansion coefficients of various materials, the volume changes caused by different materials due to temperature changes are different, resulting in gaps that are difficult to avoid at the sealing ring. This method cannot achieve a good sealing effect, especially in the case of high-temperature gas. The embodiment of the present application provides the following solution.

[0040] See also Figures 1 to 5 A firmly sealed extruder screw comprises a screw body 1 and an extruder, wherein the screw body 1 is installed in the extruder, a power connection end 14 is provided at one end of the screw body 1, and a sealing installation section, a feeding section, a compression section and a metering section 16 are sequentially provided at the power connection end 14 toward the other end, and a sealing mechanism is provided on the sealing installation section, and the sealing mechanism is used to prevent high-temperature gas from leaking through a gap between a side wall of the sealing installation section of the screw body 1 and a side wall of the extruder;

[0041] The sealing mechanism comprises an outer sealing sleeve 2, which is coaxially sleeved on the power connection end 14, and the outer sealing sleeve 2 is fixedly connected to the outer side wall of the extruder;

[0042] The sealing mechanism also includes an inner sealing sleeve 3, which is coaxially sleeved on the sealing installation section, and the inner sealing sleeve 3 is fixedly connected to the inner side wall of the extruder, and an installation cavity is opened at one end of the outer sealing sleeve 2 and the inner sealing sleeve 3 close to each other, and a clamping groove 7 is provided in the installation cavity;

[0043] The sealing mechanism further comprises a set of fixed collars 8, which are respectively arranged in the mounting cavities of the outer sealing sleeve 2 and the inner sealing sleeve 3, two sets of clamping blocks 9 are symmetrically arranged at both ends of the fixed collars 8, and the clamping blocks 9 are arranged in the clamping grooves 7, and the ends of the fixed collars 8 close to each other are all provided with rotation grooves;

[0044] The sealing mechanism further includes a driven ring 11, which is coaxially arranged in a set of fixed collars 8, and the two ends of the driven ring 11 are respectively rotatably connected to the rotating grooves of the set of fixed collars 8;

[0045] The effect of such arrangement is that the sealing installation section of the screw body 1 is arranged in the installation hole of the extruder housing, and the inner sealing sleeve 3 and the outer sealing sleeve 2 are respectively arranged on the inner side and the outer side of the extruder housing, and the inner sealing sleeve 3 and the outer sealing sleeve 2 are installed through the first bolt installation hole 5 and the first installation bolt 6, and the inner sealing sleeve 3 and the outer sealing sleeve 2 are provided with an installation cavity at one end close to each other, and the fixing collar 8 is fixed in the installation cavity by the clamping groove 7 and the clamping block 9, and a driven ring 11 is tightly coaxially installed between a group of fixing collars 8, and the driven ring 11 is coaxially fixedly connected with the sealing installation section of the screw body 1, and the driven ring 11 is coaxially rotatably connected with a group of fixing collars 8, and when the screw body 1 rotates, the driven ring 11 is driven to rotate in the sealing cavity between a group of fixing collars 8;

[0046] The sealing mechanism further comprises an inner sealing gasket 4, which is coaxially arranged on a surface of the inner sealing sleeve 3 away from the fixed collar 8, and the inner sealing gasket 4 is in contact with the side wall of the fixed collar 8;

[0047] The effect of such a setting is that when there is high-temperature gas in the extruder and the high-temperature gas enters the sealing mechanism through the inner sealing gasket 4, due to the rotation of the driven ring 11 under the screw body 1, a rotating airflow is formed in the sealing cavity, and the airflow is thrown out of the sealing mechanism through the through hole 13 tangential to the inner wall of the sealing cavity. Since a gas one-way valve is coaxially provided on the inner wall of the through hole 13, the high-temperature gas in the extruder cannot enter the sealing cavity through the through hole 13, thereby preventing the high-temperature gas in the extruder from leaking through the gap between the extruder housing and the sealing installation section of the screw body 1.

[0048] See also Figure 1 A dispersion section 15 is provided between the compression section and the metering section 16, a mixing head 17 is provided at one end of the metering section 16 away from the dispersion section 15, and a power connection end 14 penetrates the side wall of the extruder;

[0049] The effect of such arrangement is to facilitate the sealing installation of the extruder and the screw body 1, and at the same time the mixing head 17 plays a role in mixing and homogenizing the raw materials.

[0050] See also Figure 2 and Figure 4 The inner wall of the installation cavity of the inner sealing sleeve 3 is obliquely provided with a through hole 13, and the inner wall of the through hole 13 is coaxially provided with a gas one-way valve;

[0051] The effect of this arrangement is that as the driven ring 11 rotates with the screw body 1, a rotating airflow is formed in the sealing chamber, and the airflow is thrown out of the sealing mechanism through the through hole 13 which is arranged obliquely to the inner wall of the sealing chamber. Since a gas one-way valve is coaxially arranged on the inner wall of the through hole 13, the high-temperature gas in the extruder cannot enter the sealing chamber through the through hole 13.

[0052] See also Figure 1 and Figure 2 A group of clamping blocks 9 are each provided with a second bolt mounting hole 10 , in which a second mounting bolt is arranged, and a side wall of a group of clamping blocks 9 is in contact with an inner wall of the clamping groove 7 .

[0053] See also Figure 1 and Figure 2 A sealing ring 12 is provided between the gap between the driven ring 11 and a set of fixed rings 8, a mounting hole is provided on the power connection end 14, and a first bolt mounting hole 5 is provided on both the outer sealing sleeve 2 and the inner sealing sleeve 3, and a first mounting bolt 6 is provided in the first bolt mounting hole 5.

[0054] From the above, we can see that the working principle of this application is as follows:

[0055] The sealing installation section of the screw body 1 is arranged in the installation hole of the extruder housing, and the inner sealing sleeve 3 and the outer sealing sleeve 2 are respectively arranged on the inner side and the outer side of the extruder housing, and the inner sealing sleeve 3 and the outer sealing sleeve 2 are installed through the first bolt installation hole 5 and the first installation bolt 6. The inner sealing sleeve 3 and the outer sealing sleeve 2 are both provided with an installation cavity at one end close to each other, and the fixing collar 8 is fixed in the installation cavity by the clamping groove 7 and the clamping block 9. The driven ring 11 is coaxially fixedly connected with the sealing installation section of the screw body 1, and the driven ring 11 is coaxially rotatably connected with a group of fixing collars 8. When the screw body 1 rotates, the driven ring 11 is driven to rotate in the sealing cavity between the group of fixing collars 8;

[0056] When there is high-temperature gas in the extruder and the high-temperature gas enters the sealing mechanism through the inner sealing gasket 4, due to the rotation of the driven ring 11 under the screw body 1, a rotating airflow is formed in the sealing chamber, and the airflow is thrown out of the sealing mechanism through the through hole 13 obliquely arranged with the inner wall of the sealing chamber. Since a gas one-way valve is coaxially arranged on the inner wall of the through hole 13, the high-temperature gas in the extruder cannot enter the sealing chamber through the through hole 13.

[0057] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A firmly sealed extruder screw, characterized in that: include: A screw body (1), an extruder, and a sealing mechanism, wherein the screw body (1) is installed in the extruder, a power connection end (14) is provided at one end of the screw body (1), and a sealing installation section, a feeding section, a compression section, and a metering section (16) are sequentially provided toward the other end of the power connection end (14), and the sealing mechanism is coaxially arranged on the sealing installation section, and the sealing mechanism is used to prevent high-temperature gas from leaking through a gap between a side wall of the sealing installation section of the screw body (1) and a side wall of the extruder; The sealing mechanism comprises an outer sealing sleeve (2), an inner sealing sleeve (3), a group of fixed collars (8) and a driven ring (11), wherein the outer sealing sleeve (2) is coaxially sleeved on the power connection end (14), the outer sealing sleeve (2) is fixedly connected to the outer side wall of the extruder, the inner sealing sleeve (3) is coaxially sleeved on the sealing installation section, the inner sealing sleeve (3) is fixedly connected to the inner side wall of the extruder, and the ends of the outer sealing sleeve (2) and the inner sealing sleeve (3) close to each other are both provided with an installation cavity, and the installation cavity is provided at the inner side wall of the extruder. A clamping groove (7) is provided in the cavity, a group of the fixed collars (8) are respectively arranged in the installation cavities of the outer sealing sleeve (2) and the inner sealing sleeve (3), two groups of clamping blocks (9) are symmetrically provided at both ends of the fixed collars (8), and the clamping blocks (9) are arranged in the clamping groove (7), and a rotation groove is provided at one end of a group of the fixed collars (8) close to each other, and the driven ring (11) is coaxially arranged in the group of fixed collars (8), and the two ends of the driven ring (11) are respectively rotatably connected to the rotation grooves of the fixed collars (8).

2. A firmly sealed extruder screw according to claim 1, characterized in that: A dispersion section (15) is provided between the compression section and the metering section (16); a mixing head (17) is provided at one end of the metering section (16) away from the dispersion section (15); and the power connection end (14) penetrates the side wall of the extruder.

3. A firmly sealed extruder screw according to claim 2, characterized in that: The sealing mechanism further comprises an inner sealing gasket (4), which is coaxially arranged on a surface of the inner sealing sleeve (3) away from the fixed collar (8), and the inner sealing gasket (4) is in contact with a side wall of the fixed collar (8).

4. A firmly sealed extruder screw according to claim 1, characterized in that: A through hole (13) is obliquely provided on the inner wall of the installation cavity of the inner sealing sleeve (3), and a gas one-way valve is coaxially provided on the inner wall of the through hole (13).

5. A firmly sealed extruder screw according to claim 3, characterized in that: A group of the clamping blocks (9) are each provided with a second bolt mounting hole (10), a second mounting bolt is arranged in the second bolt mounting hole (10), and a side wall of the group of the clamping blocks (9) is in contact with an inner wall of the clamping groove (7).

6. A firmly sealed extruder screw according to claim 3, characterized in that: A sealing ring (12) is provided between the gap between the driven ring (11) and a set of fixed collars (8).

7. A firmly sealed extruder screw according to claim 3, characterized in that: The power connection end (14) is provided with a mounting socket, the outer sealing casing (2) and the inner sealing casing (3) are both provided with a first bolt mounting hole (5), and a first mounting bolt (6) is arranged in the first bolt mounting hole (5).

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