CN222959152U

CN222959152U - Extruder screws and twin-screw mixing extruders

Info

Publication number: CN222959152U
Application number: CN202422063742.0U
Authority: CN
Inventors: 李嵘嵘; 潘万贵
Original assignee: Ningbo Saikang Technology Development Co ltd
Current assignee: Ningbo Saikang Technology Development Co ltd
Priority date: 2024-08-23
Filing date: 2024-08-23
Publication date: 2025-06-10
Anticipated expiration: 2034-08-23

Abstract

The utility model discloses a screw rod for an extruder and a double-screw rod mixed extruder, which relate to the technical field of reaction reinforcement and comprise a driving device, a mixing cavity and two screw rod bodies, wherein the first screw thread section, the second screw thread section and the third screw thread section are sequentially distributed on the screw rod bodies in the axial direction, grooves are formed in the screw threads of the second screw thread section, the depth of the grooves extends from the top to the bottom of the screw threads, the grooves penetrate through the screw threads in the thickness direction of the screw threads to divide the screw threads of the second screw thread section into a plurality of sections, the two screw rods can be rotatably arranged in the mixing cavity, and the driving device is connected with the screw rod bodies and is used for driving the screw rod bodies to rotate. The double-screw mixing extruder provided by the utility model can improve the mixing capability of the extruder and ensure that materials are mixed more uniformly.

Description

Screw for extruder and double-screw mixing extruder

Technical Field

The utility model relates to the technical field of reaction reinforcement, in particular to a screw for an extruder and a double-screw mixing extruder.

Background

The double screw extruder is a high-efficiency extrusion device, can fully plasticize and mix materials and is formed by a die, and plays an important role in the raw material processing industries such as plastics, rubber, chemical fibers and the like. However, the shape and parameters of the screw threads in the screw elements in the twin-screw extruder are critical to the mixing and plasticizing of the materials, the screw not only provides physical space for the mixing of the materials, but also can realize the shearing, extrusion and redistribution of the materials by the rotation of the screw, thereby achieving the purpose of mixing the materials.

Patent application (CN 104411473A) discloses a double-screw extruder, the screw threads on the screw are the same screw threads, and the distribution of shearing force field and speed field received by the screw with single screw threads in the material mixing process is more regular, so that the material mixing effect of two screws in the device in the material mixing process is poor.

Disclosure of utility model

The utility model aims to provide a screw for an extruder and a double-screw mixing extruder, which are used for solving the problems in the prior art, improving the mixing capability of the extruder and strengthening the mixing effect.

In order to achieve the above object, the present utility model provides the following solutions:

The utility model provides a screw for an extruder, which comprises a screw body, wherein the screw body comprises a first thread section, a second thread section and a third thread section which are sequentially distributed in the axial direction, a groove is formed in the thread of the second thread section, the depth of the groove extends from the top to the bottom of the thread, and the groove penetrates through the thread in the thickness direction of the thread so as to divide the thread of the second thread section into a plurality of sections.

Preferably, the lengths of the first thread segments and the third thread segments of the two screw bodies are smaller than the length of the second thread segments.

Preferably, the screw body is a conical screw, and the large end of the screw body is used for being close to the feed inlet.

Preferably, the driving device, the mixing cavity and two screws for the extruder are arranged in the mixing cavity in a rotatable manner, the driving device is connected with the screw body and used for driving the screw body to rotate, and a feed inlet and a discharge outlet are arranged on the mixing cavity.

Preferably, two of said screw bodies are engaged.

Preferably, the feeding port is arranged at the top of the mixing cavity and above the first thread section, and the discharging port is arranged at the end face of the mixing cavity.

Preferably, the device further comprises a heating device, a temperature sensor and a pressure sensor, wherein the heating device is arranged outside the mixing cavity and used for heating the mixing cavity, the temperature sensor is arranged inside the mixing cavity and used for measuring the temperature in the mixing cavity, and the pressure sensor is arranged inside the mixing cavity and used for measuring the pressure in the mixing cavity.

Preferably, the heating device comprises a heating medium channel spirally wound outside the mixing cavity, and the heating medium channel is used for introducing heat conduction oil.

Preferably, the driving device comprises a motor and a transmission device, an output part of the motor is fixedly connected with an input part of the transmission device, and an output part of the transmission device is connected with two screw bodies and can drive the two screw bodies to synchronously and reversely rotate.

Preferably, the device further comprises a controller, and the driving device, the heating device, the temperature sensor and the pressure sensor are all electrically connected with the controller.

Compared with the prior art, the utility model has the following technical effects:

The utility model provides a screw for an extruder and a double-screw mixing extruder, wherein the second section of screw threads on the screw are provided with grooves by changing the shape of part of screw threads of the screw, compared with the screw with only screw threads, the grooves can form extra pressure on materials when the screw rotates, so that the pressure distribution of the materials is changed in the mixing process, the material flow is changed, the exchange among the materials is enhanced, the mixing of the materials is facilitated, the high shearing force in the mixing process can be reduced by changing the shape of the screw threads, the shearing rate distribution is more uniform, the mixing capacity of the extruder is improved, and the mixing efficiency is enhanced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a twin screw mixing extruder in accordance with one embodiment of the present utility model;

FIG. 2 is a schematic view showing the structure of a screw for an extruder according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram showing a groove structure of a screw for an extruder according to an embodiment of the present utility model;

Wherein, the device comprises a 1-pressure sensor, a 2-temperature sensor, a 3-stirring barrel, a 4-transmission device, a 5-driving device, a 6-controller, a 7-screw body, 8-threads and 9-grooves;

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

In a preferred embodiment of the present utility model, the screw for an extruder comprises a screw body 7, as shown in fig. 2, the screw body 7 comprises a first thread section, a second thread section and a third thread section which are sequentially distributed in the axial direction, the threads 8 of the second thread section are provided with grooves 9, as shown in fig. 3, the depth of the grooves 9 extends from the top to the bottom of the threads 8, and the grooves 9 penetrate the threads 8 in the direction of the thickness direction a of the threads 8 to divide the threads 8 of the second thread section into a plurality of segments. Through changing the shape and the parameter of partial threads 8 of the screw, the second section of threads 8 on the screw body 7 are provided with grooves 9, so that extra pressure can be formed when the screw body 7 rotates, the pressure distribution of materials in the mixing process is changed, the material flow is changed, the exchange between the materials is enhanced, the material mixing is facilitated, the high shearing force in the mixing process can be reduced by changing the shape of the threads 8, the shearing rate distribution is more uniform, the mixing capacity of the extruder is improved, and the mixing efficiency is enhanced.

In a preferred embodiment of the utility model, the length of the first and third flight sections of the two screw bodies 7 is smaller than the length of the second flight section. The first screw thread section and the third screw thread section are mainly used for carrying the material, and the second screw thread section is mainly used for strengthening the mixing of material, and the length of second screw thread section is longer relatively, makes the mixing area of material bigger, more is favorable to the mixing of material, strengthens the material mixing effect.

In a preferred embodiment of the present utility model, the screw body 7 is a conical screw, and the large end of the screw body 7 is used to approach the feed inlet. The screw body 7 is the toper, and the toper screw rod can make the material become "8" font extrusion in the mixing chamber when rotatory, has increased the plasticizing time, and reduces the friction between material and the screw body 7 to improve the plasticizing quality of material.

In another preferred embodiment of the present utility model, the twin-screw mixing extruder comprises a driving device 5, a mixing cavity and two screws for the extruder, wherein two screw bodies 7 can be rotatably arranged in the mixing cavity 3, the driving device 5 is connected with the screw bodies 7 and is used for driving the screw bodies 7 to rotate, and a feed inlet and a discharge outlet are arranged on the mixing cavity 3. Through changing the partial thread 8 shape and the parameter of screw rod, make the second section screw thread 8 on the screw rod body 7 be provided with recess 9, can compare in the screw rod that only is provided with the screw thread when the screw rod body 7 rotates, the recess can form extra pressure to the material when the screw rod rotates, make the material change at the pressure distribution of mixing process, thereby make the material flow change, strengthen the exchange between the material, be favorable to the material to mix, change the high shearing force of screw thread 8 shape in the mixing process can be reduced simultaneously, make shear rate distribution more even, thereby improve the mixing ability of extruder, reinforce mixing efficiency.

In a preferred embodiment of the utility model, the two screw bodies 7 are engaged. The meshing of the two screw bodies 7 can improve the mixing uniformity of materials, enhance the conveying capacity of the materials and improve the production efficiency.

In a preferred embodiment of the utility model, the feed inlet is arranged at the top of the mixing chamber 3 and above the first thread section, and the discharge outlet is arranged at the end face of the mixing chamber 3. The feed inlet is arranged to convey the materials into the mixing chamber 3, and the discharge outlet is arranged to output the mixed materials.

In a preferred embodiment of the utility model, the device further comprises a heating device, a temperature sensor 2 and a pressure sensor 1, wherein the heating device is arranged outside the mixing cavity 3 and used for heating the mixing cavity 3, the temperature sensor 2 is arranged inside the mixing cavity 3 and used for measuring the temperature in the mixing cavity 3, and the pressure sensor 1 is arranged inside the mixing cavity 3 and used for measuring the pressure in the mixing cavity 3. The heating device, the temperature sensor 2 and the pressure sensor 1 are arranged, so that the temperature and the pressure in the mixing cavity 3 are always in a set range, thereby ensuring the quality of products and improving the production efficiency.

In a preferred embodiment of the utility model, the heating device comprises a heating medium channel spirally wound outside the mixing cavity, and the heating medium channel is used for introducing heat conduction oil. The heat medium channel is used for heating heat-conducting oil to enable the temperature in the mixing cavity 3 to be increased, and when the materials need to be cooled after reacting, the heat-conducting oil is led out and the glycol is led in, so that the temperature in the mixing cavity 3 can be reduced.

In a preferred embodiment of the present utility model, the driving device 4 includes a motor and a transmission device 4, an output member of the motor is fixedly connected with an input member of the transmission device 4, and an output member of the transmission device 4 is connected with the two screw bodies 7 and can drive the two screw bodies 7 to synchronously and reversely rotate. The motor drives the screw body 7 to rotate through the transmission device 4, and supplies torque and rotation speed required by the screw body 7 in the rotation process, so that extrusion of materials is completed, and the transmission device is preferably a gear box.

In a preferred embodiment of the present utility model, the device further comprises a controller 6, and the driving device, the heating device, the temperature sensor 2 and the pressure sensor 1 are all electrically connected with the controller 6. The controller 6 in the extruder can operate efficiently and stably by precisely controlling the pressure and temperature in the mixing chamber 3 and controlling the driving of the motor, thereby meeting the requirements of the extruder process.

The principles and embodiments of the present utility model have been described in detail with reference to specific examples, which are provided herein to facilitate understanding of the principles and embodiments of the present utility model and to provide further advantages and practical applications for those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the utility model.

Claims

1. The screw for the extruder is characterized by comprising a screw body, wherein the screw body comprises a first thread section, a second thread section and a third thread section which are sequentially distributed in the axial direction, a groove is formed in the thread of the second thread section, the depth of the groove extends from the top to the bottom of the thread, and the groove penetrates through the thread in the thickness direction of the thread so as to divide the thread of the second thread section into multiple sections.

2. The extruder screw according to claim 1, wherein the length of each of the first flight section and the third flight section of the two screw bodies is smaller than the length of the second flight section.

3. The screw for an extruder of claim 1 wherein said screw body is a tapered screw and said large end of said screw body is adapted to be adjacent to a feed port.

4. A double-screw mixing extruder is characterized by comprising a driving device, a mixing cavity and two screws for the extruder, wherein the screws are arranged in the mixing cavity in a rotatable manner, the driving device is connected with the screw body and used for driving the screw body to rotate, and a feed inlet and a discharge outlet are arranged on the mixing cavity.

5. A twin-screw mixing extruder as defined in claim 4, wherein two of said screw bodies are meshed.

6. The twin-screw mixing extruder of claim 5, wherein the feed inlet is disposed at the top of the mixing chamber and above the first flight section, and the discharge outlet is disposed at the end face of the mixing chamber.

7. The twin-screw mixing extruder of claim 4, further comprising a heating device disposed outside the mixing chamber for heating the mixing chamber, a temperature sensor disposed inside the mixing chamber for measuring a temperature in the mixing chamber, and a pressure sensor disposed inside the mixing chamber for measuring a pressure in the mixing chamber.

8. The twin-screw mixing extruder of claim 7, wherein the heating means comprises a heat medium passage spirally wound outside the mixing chamber, and the heat medium passage is internally used for introducing heat transfer oil.

9. The twin-screw mixing extruder of claim 8, wherein the driving device comprises a motor and a transmission device, an output part of the motor is fixedly connected with an input part of the transmission device, and an output part of the transmission device is connected with two screw bodies and can drive the two screw bodies to synchronously and reversely rotate.

10. The twin screw mixing extruder of claim 9, further comprising a controller, wherein the drive means, the heating means, the temperature sensor, and the pressure sensor are electrically connected to the controller.