Cylinder structure of low-bulk-density double-screw extruder and extruder

Abstract

The utility model discloses a low bulk density twin-screw extruder cylinder structure and an extruder, and relates to the technical field of extruder structures, the low bulk density twin-screw extruder cylinder structure comprises a cylinder body, the cylinder body is provided with a feed port and a discharge port, the cylinder body is composed of a plurality of sections of cylinders, the cylinders comprise a cylinder I and a cylinder II, and the diameter of the cylinder I is larger than that of the cylinder II; a plurality of sections of machine barrels II are arranged between the two sections of machine barrels I; and feeding holes are formed in the machine barrel I and the machine barrel II. The structure of the barrel body enables materials to undergo different processing processes in the barrels with different lengths, and the stepped barrel structure is adopted, so that the stacking density of the materials can be effectively reduced, the fluidity of the materials can be improved, fine treatment of the materials can be realized, and the quality of the processed materials can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to extruder structure technical field, concretely relates to a low bulk density double screw extruder barrel structure and extruder. BACKGROUND

[0002] In recent years, with the rapid development of economy, the plastic machinery industry is booming, and the demand for polymer modified materials is increasing, and the requirement for double screw extruders is also increasing, and as an important type, the co-rotating parallel double screw extruder is widely concerned.

[0003] The co-rotating parallel double screw extruder is a commonly used equipment in the plastic processing industry, and the barrel is an important part of material plasticizing, conveying and mixing. The existing co-rotating parallel double screw extruder barrel structure has some deficiencies. For example, the barrel of the traditional double screw extruder has poor heat dissipation effect, which can easily lead to high internal temperature and affect the extrusion quality of the material; the sealing structure of the barrel is not perfect, which can cause material leakage or external impurities to enter the barrel; and the material flow channel in the barrel is not conducive to uniform mixing and stable conveying in some cases.

[0004] In addition, the current double screw extruder barrel adopts a single function segment continuous arrangement mode, and the material is prone to uneven bulk density due to insufficient compression ratio during conveying, especially when processing low flowability plastics, which can cause insufficient melting and poor exhaust. INVENTION CONTENTS

[0005] The technical problem to be solved by the utility model is that the current double screw extruder barrel adopts a single function segment continuous arrangement mode, and the material is prone to uneven bulk density due to insufficient compression ratio during conveying, especially when processing low flowability plastics, which can cause insufficient melting and poor exhaust. Based on this, the utility model provides a low bulk density double screw extruder barrel structure and an extruder, which optimizes the structure of the extruder barrel, effectively reduces the bulk density of the material, improves the flowability of the material, and solves the problem of uneven bulk density of the material due to insufficient compression ratio during conveying.

[0006] The utility model realizes the following technical scheme:

[0007] In the first aspect, the application provides a low bulk density double screw extruder barrel structure, which comprises a barrel body, a feeding port and a discharging port are arranged on the barrel body, the barrel body is composed of multiple barrel sections, the barrel section comprises a barrel section one and a barrel section two, the diameter of the barrel section one is greater than the diameter of the barrel section two, and the feeding port is arranged on the barrel section one and the barrel section two.

[0008] The structure of the barrel body can make the material experience different processing processes in different length barrels, adopt a stepped barrel structure, effectively reduce the bulk density of the material, improve the flowability of the material, realize fine processing of the material, and improve the quality of the processed material.

[0009] Further, the diameter of the first barrel is 1.5-2 times the diameter of the second barrel.

[0010] Further, the length of the second barrel is 3-5 times the length of the first barrel.

[0011] Further, the length of the second barrel is 3-5 times the length of the first barrel.

[0012] Further, the second barrel is connected by a plurality of barrel segments through detachable connecting pieces.

[0013] The second barrel adopts a segmented structure design and is spliced by a plurality of barrel segments. According to actual needs, the length of each barrel segment can be controlled. This barrel body structure is convenient to disassemble and install, and when cleaning or maintenance is needed, the barrel segments can be easily disassembled for thorough cleaning of the inside, and damaged parts can also be easily replaced, reducing the difficulty and time cost of cleaning and maintenance.

[0014] If the first barrel used is also long, the first barrel can also consider adopting a segmented structure, and the connection between the first barrel and the second barrel can be an integral structure or a structure connected by detachable connecting pieces.

[0015] Further, the detachable connecting piece includes a connecting block connected to the barrel segment, and a bolt hole is arranged on the connecting block. The adjacent barrel segments are connected and fixed by connecting locking bolts in the bolt holes.

[0016] Further, one end of the barrel segment is provided with an annular clamping block, and the other end is provided with an annular clamping groove clamped with the annular clamping block.

[0017] Further, the detachable connecting piece includes an annular threaded groove arranged at one end of the barrel segment, and the other end of the barrel segment is provided with an annular threaded mounting block threadedly connected with the annular threaded groove.

[0018] Further, a spiral groove is arranged on the outer wall of the barrel body, and a medium pipeline is installed in the spiral groove.

[0019] The medium pipeline is spirally wound outside the barrel body structure of the extruder barrel, and cold medium or hot medium is passed into the medium pipeline to cool or heat the material in the barrel body, thereby improving the temperature control efficiency, avoiding uneven plasticization of the material, and further improving the quality of the product.

[0020] In addition, by arranging the spiral groove on the outer wall of the barrel body to install the medium pipeline, not only the contact area between the medium pipeline and the barrel body can be increased, thereby improving the heating or cooling rate, but also the installation of the medium pipeline in the spiral groove makes the installation of the medium pipeline more firm, and the space occupied by the barrel body is reduced.

[0021] Further, the sealing end cover is spirally connected to the opening at each end of the barrel body, a through hole for installing the screw rod is arranged on the sealing end cover, and a sealing ring is arranged on the inner wall of the through hole.

[0022] The sealing end cover and the barrel body can be sealed by a labyrinth seal structure, which comprises an annular groove arranged on the barrel body and an annular protrusion arranged on the sealing end cover and connected with the annular groove.

[0023] The labyrinth seal structure used between the sealing end cover and the barrel body can effectively block the leakage path of the material, and the labyrinth seal structure and the sealing ring form a double sealing structure, thereby ensuring the sealing performance of the barrel and further preventing the material from leaking from both ends of the barrel.

[0024] In addition, a pressure sensor and / or a temperature sensor can also be arranged in the barrel body. The pressure sensor and the temperature sensor arranged in the barrel body can monitor the pressure value and the temperature value in the barrel body at any time, thereby ensuring the safe operation of the equipment.

[0025] The pressure sensor can monitor the pressure change in the barrel in real time and transmit the signal to the control system. When the pressure in the barrel body exceeds the set pressure value, the control system can take timely measures, such as adjusting the rotation speed of the screw rod or passing cooling liquid or heating liquid into the medium pipeline, to ensure the safe operation of the equipment.

[0026] The temperature sensor can monitor the temperature change in the barrel in real time and transmit the signal to the control system. When the temperature in the barrel body exceeds the set temperature value, the control system can take timely measures, such as passing cooling liquid or heating liquid into the medium pipeline, to ensure the safe operation of the equipment.

[0027] In the second aspect, the application provides an extruder comprising the barrel structure.

[0028] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0029] (1) the structure of the barrel body of the application can make the material experience different processing processes in different length barrels, adopt the stepped barrel structure, can effectively reduce the bulk density of the material, improve the fluidity of the material, realize the fine treatment of the material, and improve the quality of the material after processing.

[0030] (2) the barrel two of the application adopts a sectional structure design and is spliced by multiple barrel segments, the length of each barrel segment can be controlled according to actual requirements, the structure of the barrel body is convenient to disassemble and install, and when cleaning or maintenance is required, the barrel segments can be disassembled more conveniently, the interior is cleaned thoroughly, and meanwhile, damaged parts can be replaced conveniently, so that the difficulty and time cost of cleaning and maintenance are reduced.

[0031] (3) the application realizes cooling and heating of the material in the barrel body by spirally winding the medium pipeline outside the barrel body of the extruder barrel structure and passing cold medium or hot medium in the medium pipeline, improves the temperature control efficiency, avoids uneven plasticization of the material, and further improves the quality of the product, and meanwhile, the sealing end cover spirally installed improves the sealing performance of the barrel interior, preventing the material from leaking from both ends of the barrel.

[0032] (4) the application installs the medium pipeline on the spiral groove on the outer wall of the barrel body, which not only can improve the contact area between the medium pipeline and the barrel body, and further improve the heating or cooling rate, but also makes the installation of the medium pipeline more firm, and can also reduce the space occupied by the barrel body. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings described herein are used to provide further understanding of the embodiments of the utility model and form part of the application, and do not constitute limitation to the embodiments of the utility model. In the drawings:

[0034] Figure 1 It is the external structure schematic view of a low bulk density double screw extruder barrel structure in the utility model embodiment 1;

[0035] Figure 2 It is the internal structure schematic view of a low bulk density double screw extruder barrel structure in the utility model embodiment 1;

[0036] Figure 3 It is Figure 2 The enlarged view of A in the middle;

[0037] Figure 4 It is the internal structure schematic view of a low bulk density double screw extruder barrel structure in the utility model embodiment 2;

[0038] Figure 5 is Figure 4 enlarged view of B;

[0039] Figure 6 is an external structure schematic view of a low bulk density double screw extruder barrel structure in the embodiment 2 of the utility model;

[0040] Figure 7 is an external structure schematic view of a low bulk density double screw extruder barrel structure in the embodiment 3 of the utility model;

[0041] Figure 8 is an internal structure schematic view of a low bulk density double screw extruder barrel structure in the embodiment 3 of the utility model;

[0042] Figure 9 is Figure 8 enlarged view of C;

[0043] Figure 10 is an internal structure schematic view of a low bulk density double screw extruder barrel structure in the embodiment 4 of the utility model;

[0044] Figure 11 is Figure 10 enlarged view of D;

[0045] Figure 12 is an internal structure schematic view of a low bulk density double screw extruder barrel structure in the embodiment 5 of the utility model;

[0046] Figure 13 is Figure 12 enlarged view of E.

[0047] Markings in the drawings and corresponding component names:

[0048] 01-sealing end cover, 02-feed inlet, 03-barrel one, 04-barrel two, 05-discharge port, 06-through hole, 07-annular groove, 08-annular protrusion, 09-medium pipeline, 10-spiral groove, 11-barrel section, 12-connection block, 13-locking bolt, 14-annular clamping groove, 15-annular clamping block, 16-annular threaded groove, 17-annular threaded mounting block, 18-vacuum exhaust hole. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0051] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0052] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, a joint, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0053] Example 1

[0054] like Figures 1 to 3 As shown, this embodiment provides a low bulk density twin-screw extruder barrel structure, including a barrel body with a feed inlet 02 and a discharge outlet 05. The barrel is composed of multiple barrel sections, including a first barrel 03 and a second barrel 04. The diameter of the first barrel 03 is larger than the diameter of the second barrel 04. Multiple second barrel sections 04 are arranged between the two first barrel sections 03. Both the first barrel 03 and the second barrel 04 are provided with feed inlets 02.

[0055] Specifically, the barrel body in this embodiment is divided into two groups of functional units, each group containing a 6D ("D" represents the diameter of the barrel) conveying section (barrel one 03) and four 4D mixing sections (barrel two 04) connected in series, and the two groups of units are arranged side by side along the axial direction to form an alternating compression-relaxation path. A stepped feeding port 02 is arranged at the end of the first 6D barrel and the starting end of the second group of 4*4D, realizing the step-by-step feeding of main and auxiliary materials. Through this specific barrel arrangement and the arrangement of the feeding port 02, the bulk density of the material can be effectively reduced, and the flowability of the material in the barrel can be improved. Vacuum exhaust holes 18 are arranged between each group of 4*4D mixing sections, which cooperate with the design of gradually changing screw lead to reduce the residence time of the material.

[0056] Specifically, the openings at both ends of the barrel body are spirally connected with sealing end covers 01, the sealing end covers 01 are provided with through holes 06 for mounting the screw, and sealing rings are mounted on the inner walls of the through holes 06. The sealing end covers 01 and the barrel body can be sealed by a labyrinth seal structure, which includes an annular groove 07 arranged on the barrel body and an annular protrusion 08 arranged on the sealing end cover 01 and connected with the annular groove 07. The labyrinth seal structure used between the sealing end cover 01 and the barrel body can effectively block the leakage path of the material, and the combination of the sealing ring forms a double sealing structure, which ensures the sealing performance of the barrel and further prevents the material from leaking from both ends of the barrel.

[0057] The structure of the barrel body can make the material experience different processing processes in barrels of different lengths, and the use of a stepped barrel structure can effectively reduce the bulk density of the material, improve the flowability of the material, realize the fine processing of the material, and improve the quality of the processed material.

[0058] Embodiment 2

[0059] As shown in Figures 4 to 6 Based on embodiment 1, this embodiment provides a low-bulk-density double-screw extruder barrel structure, which is different from embodiment 1 in that the outer wall of the barrel body in this embodiment is provided with a spiral groove 10, and a medium pipeline 09 is mounted in the spiral groove 10. Other structural features are the same as those of embodiment 1.

[0060] The medium in the medium pipeline 09 can be hot oil, water, etc. For example, when heating is needed, hot oil is introduced into the medium pipeline 09, and when cooling is needed, cold water is introduced into the medium pipeline 09. The liquid inlet end of the medium pipeline 09 is connected with a joint, and the joint is connected with a pipeline for supplying medium. Two branch pipes can be arranged on the joint, and the two branch pipes are connected with control valves, one of the branch pipes is connected with a hot medium process equipment, and the other branch pipe is connected with a cold medium supply equipment (i.e. an equipment for providing hot medium (hot oil) and cold medium (cold water)). When heating is needed, the control valve on the branch pipe connected with the hot medium supply equipment is opened, and the control valve on the branch pipe connected with the cold medium supply equipment is closed. When cooling is needed, the control valve on the branch pipe connected with the cold medium supply equipment is opened, and the control valve on the branch pipe connected with the hot medium supply equipment is closed. In addition, the outlet end of the medium pipeline 09 is communicated with a medium receiving bucket.

[0061] Compared with example 1, the advantages of this example are that the cold medium or hot medium is introduced into the medium pipeline 09 to cool and heat the material in the barrel body by spirally winding the medium pipeline 09 outside the barrel body of the extruder barrel structure, which improves the temperature control efficiency, avoids uneven plasticization of the material, and thus improves the quality of the product. Meanwhile, the sealing end cover 01 improves the sealing performance of the barrel interior to prevent the material from leaking from both ends of the barrel. Furthermore, the medium pipeline 09 is installed on the outer wall of the barrel body by the spiral groove 10, which not only increases the contact area between the medium pipeline 09 and the barrel body to improve the heating or cooling rate, but also makes the installation of the medium pipeline 09 more stable and reduces the space occupied by the barrel body.

[0062] Example 3

[0063] As shown in Figures 7 to 9 based on example 1, this example provides a low bulk density twin-screw extruder barrel structure, which is different from example 1 in that the barrel 104 in this example is connected by detachable connecting pieces. Other structural features are the same as those of example 1.

[0064] Specifically, the detachable connecting piece includes a connecting block 12 connected to the barrel segment 11, and the connecting block 12 is provided with a bolt hole. The adjacent barrel segments 11 are connected and fixed by connecting a locking bolt 13 in the bolt hole.

[0065] Compared with example 1, the advantages of this example are that the barrel two 04 adopts a segmented structure design, which is spliced by multiple barrel segments 11, and the length of each barrel segment 11 can be controlled according to actual needs. This barrel body structure is convenient to disassemble and install, and when cleaning or maintenance is needed, the barrel segments 11 can be disassembled more conveniently for thorough cleaning of the inside, and it is also convenient to replace damaged parts, reducing the difficulty and time cost of cleaning and maintenance. In addition, if the barrel one 03 used is also relatively long, the barrel one 03 can also consider adopting a segmented structure, and the connection mode between the barrel one 03 and the barrel two 04 can be an integral structure or a structure connected by detachable connectors.

[0066] Example 4

[0067] As shown in Figure 10 , 11 , based on example 3, this example provides a low bulk density twin screw extruder barrel structure, which is different from example 3 in that the barrel segment 11 in this example is provided with an annular clamping block 15 at one end and an annular clamping groove 14 clamped with the annular clamping block 15 at the other end. Other structural features are the same as example 3.

[0068] Compared with example 3, the advantages of this example are that by providing an annular clamping block 15 at one end of the barrel segment 11 and an annular clamping groove 14 clamped with the annular clamping block 15 at the other end, the annular clamping block 15 can be clamped into the annular clamping groove 14 of the adjacent barrel segment 11 during installation, which not only makes it more convenient for workers to install the locking bolt 13, but also further improves the sealing between the spliced barrel segments 11, avoiding gaps between the spliced barrel segments 11 and causing material leakage inside the barrel body.

[0069] Example 5

[0070] As shown in Figure 12 , 13 , based on example 3, this example provides a low bulk density twin screw extruder barrel structure, which is different from example 3 in that the detachable connector in this example includes an annular threaded groove 16 provided at one end of the barrel segment 11, and the other end of the barrel segment 11 is provided with an annular threaded mounting block 17 threadedly connected with the annular threaded groove 16.

[0071] Compared with example 3, the advantages of this example are that the barrel two 04 of this example does not need to be installed with a connecting block 12, i.e. does not need to be installed with a flange plate, and the adjacent barrel segments 11 are installed in a threaded connection mode, which not only can improve the connection speed of the barrel segments 11, but also the preparation of this barrel structure is simpler, and the threaded connection structure has better sealing performance.

[0072] The above detailed description of the specific embodiments of the present application has been made for the purpose of further explaining the purpose, technical scheme and beneficial effects of the present application, and it should be understood that the above description is only the specific embodiments of the present application and is not used to limit the protection scope of the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A low bulk density twin screw extruder barrel structure comprising a barrel body, on which a feeding port (02) and a discharging port (05) are arranged, characterized in that, The barrel body is composed of multiple barrel segments, the barrel segments include barrel one (03) and barrel two (04), the diameter of the barrel one (03) is larger than the diameter of the barrel two (04); the barrel one (03) and the barrel two (04) are both provided with a feeding port (02).

2. A low bulk density twin screw extruder barrel structure according to claim 1, characterized in that, The diameter of the barrel one (03) is 1.5-2 times of the diameter of the barrel two (04).

3. A low bulk density twin screw extruder barrel structure according to claim 1, wherein, The length of the barrel two (04) is 3-5 times of the length of the barrel one (03).

4. A low bulk density twin screw extruder barrel construction according to claim 1 wherein, The barrel two (04) is connected by detachable connecting pieces.

5. A low bulk density twin screw extruder barrel construction according to claim 4 wherein, The detachable connecting pieces include connecting blocks (12) connected to the barrel segments (11), the connecting blocks (12) are both provided with bolt holes, adjacent barrel segments (11) are connected and fixed by connecting locking bolts (13) in the bolt holes.

6. A low bulk density twin screw extruder barrel construction according to claim 4 wherein, One end of the barrel segment (11) is provided with an annular clamping block (15), and the other end is provided with an annular clamping groove (14) clamped with the annular clamping block (15).

7. A low bulk density twin screw extruder barrel construction according to claim 4 wherein, The detachable connecting pieces include annular threaded grooves (16) provided at one end of the barrel segment (11), and the other end of the barrel segment (11) is provided with an annular threaded mounting block (17) threadedly connected with the annular threaded groove (16).

8. A low bulk density twin screw extruder barrel construction according to claim 1 wherein, The outer wall of the barrel body is provided with a spiral groove (10), and a medium pipeline (09) is installed in the spiral groove (10).

9. A low bulk density twin screw extruder barrel construction according to claim 1 wherein, The openings at both ends of the barrel body are both spirally connected with sealing end covers (01), the sealing end covers (01) are provided with through holes (06) for installing screw rods, and sealing rings are installed on the inner walls of the through holes (06).

10. An extruder characterized by, The barrel structure includes any one of claims 1-9. The barrel structure includes any one of claims 1-9.

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