CN217319233U

CN217319233U - Double-screw extruder

Info

Publication number: CN217319233U
Application number: CN202123077248.2U
Authority: CN
Inventors: 熊陶; 张万涛; 曾美昌; 李水平; 眭志华
Original assignee: Shenzhen Diyuan New Materials Technology Co ltd
Current assignee: Shenzhen Diyuan New Materials Technology Co ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-08-30
Anticipated expiration: 2031-12-08

Abstract

The application provides a double screw extruder, including drive arrangement, mixing device, sealing device and temperature control device, mixing device includes that two screw rods that link to each other and parallel arrangement locate two outside barrels of screw rod with the cover with drive arrangement, the length direction along the screw rod is formed with the runner in each screw rod, the both ends of runner all are located the one end that the screw rod is close to drive arrangement, sealing device is close to drive arrangement's one end sealing connection with the screw rod, temperature control device is used for carrying the conduction oil to sealing device, in order to supply the conduction oil to the runner, and receive the conduction oil of runner backward flow. The application provides a double screw extruder is through forming the runner in two screws to arrange the both ends of runner in the one end that the screw rod is close to drive arrangement, with sealing device with the screw rod be close to drive arrangement's one end sealing connection, let in the conduction oil by temperature control device in to sealing device, thereby reduce the temperature of screw rod, the cooling effect is simple high-efficient.

Description

Double-screw extruder

Technical Field

The application belongs to the technical field of extruders, and particularly relates to a double-screw extruder.

Background

The double screw extruder relies on the double screw to mix the compounding material of production plastic granules, because the barrel space of holding screw is airtight, and mixing process need arrange in high temperature environment, including the double screw shearing force for screw rod temperature itself lasts and rises, leads to the material to cross the plastify, and in addition, the too high material that can cause of screw rod temperature decomposes with higher speed, releases more gas, leads to finished product plastic granules gas pocket and adhesion to appear, influences plastic granules's quality and productivity.

SUMMERY OF THE UTILITY MODEL

An object of this application embodiment is to provide a twin-screw extruder with temperature control device to solve the twin-screw extruder that exists among the prior art in the course of the work, the too high problem of screw temperature.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions: providing a twin screw extruder comprising:

a drive device;

the mixing device comprises two screws which are connected with the driving device and are arranged in parallel and a machine barrel sleeved outside the two screws, a flow channel is formed in each screw along the length direction of the screw, and two ends of each flow channel are positioned at one end of the screw close to the driving device;

the sealing device is used for sealing and connecting one end of the screw rod close to the driving device;

and the temperature control device is used for conveying heat conduction oil to the sealing device so as to supply the heat conduction oil to the flow channel and receive the heat conduction oil returned by the flow channel.

In one embodiment, the temperature control device comprises an oil tank for storing heat conduction oil, an oil pump for conveying the heat conduction oil, a cooling mechanism for reducing the temperature of the heat conduction oil, and a temperature controller for monitoring the temperature of the heat conduction oil entering the flow passage to control the operation of the oil pump, wherein an outlet of the sealing device is connected with the oil tank, an inlet of the oil pump is connected with an outlet of the cooling mechanism, an outlet of the oil pump is connected with an inlet of the sealing device, an inlet of the cooling mechanism is connected with the oil tank, and the temperature controller is arranged at an outlet of the oil pump.

In one embodiment, the cooling mechanism is a heat exchanger; or the cooling mechanism is a radiator.

In one embodiment, the flow channel is U-shaped or V-shaped.

In one embodiment, a plurality of flow passages are provided in each screw.

In one embodiment, the temperature controller comprises a temperature sensor arranged at the outlet of the oil pump and a controller electrically connected with the temperature sensor, and the oil pump is electrically connected with the controller.

In one embodiment, the sealing device is a sealing box, a groove is formed in one end, close to the driving device, of each screw, and the sealing box is clamped in the groove.

In one embodiment, the mixing device comprises a feeding device, wherein the feeding device comprises a hopper arranged at the top of one end of the machine barrel close to the driving device, a stirring motor arranged on the periphery of the hopper and a stirring piece arranged in the hopper and connected with the stirring motor.

In one embodiment, the threads of the two screws are arranged in the same direction, or; the screw threads of the two screws are arranged in different directions.

In one embodiment, the drive means comprises a motor and a reducer connected to the motor, the reducer being connected to the two screws.

The double-screw extruder that this application embodiment provided has: compared with the prior art, the double screw extruder of this application, through forming the runner along screw rod length direction in two screws, and arrange the both ends of runner in the one end that the screw rod is close to drive arrangement, the one end that is close to drive arrangement at the screw rod sets up sealing device, sealing device is close to drive arrangement's one end sealing connection with the screw rod, make the position department that is close to drive arrangement's one end on two screws form a confined space, link to each other sealing device and temperature control device, temperature control device lets in the conduction oil to sealing device, the conduction oil gets into in the screw rod through the one end of runner, the heat of conduction oil absorption screw rod, then flow out from the other end of runner, flow back to temperature control device through sealing device again. The temperature of the heat conducting oil entering the sealing device can be controlled by the temperature control device, the heat of the screw rod can be taken away when the heat conducting oil enters the flow channel, the temperature of the screw rod is reduced, the temperature in the machine barrel is reduced simultaneously, the cooling effect is simple and efficient, the phenomenon that the temperature of the screw rod is too high is avoided, the processed material is over-plasticized, the material decomposition is accelerated due to the fact that the temperature is too high, gas is released, and the finished plastic particles are air holes and adhered.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or exemplary technical descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of a twin-screw extruder provided in an embodiment of the present application;

FIG. 2 is a cross-sectional view of a screw provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a sealing device according to an embodiment of the present disclosure;

wherein, in the drawings, the reference numerals are mainly as follows:

100-twin screw extruder; 10-a drive device; 11-a motor; 12-a reducer; 20-a mixing device; 21-screw rod; 211-a flow channel; 212-a groove; 22-a cylinder; 23-a feeding device; 231-a hopper; 232-stirring motor; 30-a sealing device; 31-a seal box; 311-a separator; 40-a temperature control device; 41-oil tank; 42-an oil pump; 43-a cooling mechanism; 44-a temperature controller; 50-supporting seat.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be 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 be indirectly connected to the other element.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present application, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Reference throughout this specification to "one embodiment," "some embodiments," or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Referring to fig. 1 and 2, a twin screw extruder 100 provided herein will now be described. The twin-screw extruder 100 includes a driving device 10, a kneading device 20, a sealing device 30, and a temperature control device 40. The mixing device 20 comprises a machine barrel 22 and two screws 21 arranged in parallel, the machine barrel 22 is sleeved outside the two screws 21, a closed space is formed inside the machine barrel 22, the two screws 21 are connected with a driving device 10, and the driving device 10 can drive the two screws 21 to rotate so as to provide driving force for kneading and mixing the extruded mixed material by the two screws 21 to form the processed material in a molten state. Each screw 21 has a flow channel 211 formed therein, the flow channel 211 is disposed along the length direction of the screw 21, and both ends of the flow channel 211 are located at one end of the screw 21 close to the driving device 10, that is, both ends of the flow channel 211 inside the screw 21 are formed at one end of the screw 21 close to the driving device 10.

The sealing device 30 is disposed at one end of the screw 21 close to the driving device 10, the sealing device 30 hermetically connects one end of the screw 21 close to the driving device 10, two ends of the flow channel 211 of the screw 21 are disposed inside the sealing device 30, that is, a sealed space is formed at one end of the screw 21 close to the driving device 10 due to the sealing device 30, two ends of the flow channel 211 in the screw 21 are also disposed in the sealed space to prevent the heat transfer oil from leaking, and at the same time, the heat transfer oil can be supplied to the flow channel 211 through the sealing device 30, and the heat transfer oil flowing out from the flow channel 211 is recovered.

The temperature control device 40 is connected to the sealing device 30, and the temperature control device 40 is configured to supply heat transfer oil to the sealing device 30 to supply the heat transfer oil to the flow channel 211 and receive the heat transfer oil returned from the flow channel 211. That is, the temperature control device 40 conveys heat conduction oil into the sealing device 30, the heat conduction oil then enters the screw 21 through one end of the flow passage 211, the heat of the screw 21 is transferred to the heat conduction oil, the heat conduction oil absorbing the heat of the screw 21 flows out from the other end of the flow passage 211 and then flows back to the temperature control device 40, the temperature of the screw 21 is reduced by the heat conduction oil, and the temperature of the returned heat conduction oil, namely the temperature of the heat conduction oil entering the sealing device 30, can be adjusted by the temperature control device 40 in the machine barrel 22, so that the temperature of the screw 21 can be adjusted better and more efficiently.

Compared with the prior art, the twin-screw extruder 100 provided by the embodiment of the present application forms the flow channel 211 in the two screws 21 along the length direction of the screws 21, and places both ends of the flow channel 211 at one end of the screw 21 close to the driving device 10, a sealing device 30 is arranged at one end of the screw 21 close to the driving device 10, the sealing device 30 connects one end of the screw 21 close to the driving device 10 in a sealing way, so that a sealed space is formed at a position on the two screws 21 near one end of the driving device 10, the sealing device 30 is connected with the temperature control device 40, the temperature control device 40 feeds heat conduction oil into the sealing device 30, the heat conduction oil enters the screws 21 through one end of the flow channel 211, the heat conduction oil absorbs heat of the screws 21, then flows out of the other end of the flow path 211 and then flows back to the temperature control device 40 through the sealing device 30. The temperature of the heat conducting oil entering the sealing device 30 can be controlled by the temperature control device 40, the heat of the screw 21 can be taken away when the heat conducting oil enters the flow channel, the temperature of the screw 21 is reduced, the temperature in the machine barrel 22 is reduced simultaneously, the cooling effect is simpler and more efficient, the phenomenon that the temperature of the screw 21 is too high is avoided, the processed material is over-plasticized, the material decomposition is accelerated due to the fact that the temperature is too high, gas is released, and the finished plastic particles are air holes and adhered.

In one embodiment, referring to fig. 1 and 2, the temperature control device 40 includes an oil tank 41, an oil pump 42, a temperature reduction mechanism 43, and a temperature controller 44. The oil tank 41 is used for storing returned heat conduction oil, the oil pump 42 is used for conveying the heat conduction oil to the sealing device 30, the temperature reducing mechanism 43 is used for reducing the temperature of the heat conduction oil, and the temperature controller 44 is used for monitoring the temperature of the heat conduction oil entering the flow channel 211 so as to control the operation of the oil pump 42, so that the temperature of the heat conduction oil entering the sealing device 30 is adjusted, and the temperature reducing effect of the screw 21 is ensured.

Specifically, the oil tank 41, the oil pump 42, the cooling mechanism 43 and the sealing device 30 are provided with an outlet and an inlet, the outlet of the sealing device 30 is connected with the inlet of the oil tank 41, the heat transfer oil which flows out from the flow channel 211 and absorbs the heat of the screw 21 flows out from the outlet of the sealing device 30 and is stored in the oil tank 41, the inlet of the cooling mechanism 43 is connected with the outlet of the oil tank 41, the heat transfer oil which absorbs the heat of the screw 21 flows out from the outlet of the oil tank 41 and then enters the cooling mechanism 43, the outlet of the cooling mechanism 43 is connected with the inlet of the oil pump 42, the heat transfer oil is discharged from the cooling mechanism 43 after being cooled and flows into the oil pump 42, the outlet of the oil pump 42 is provided with a temperature controller 44, the temperature controller 44 can monitor the temperature of the heat transfer oil which enters the sealing device 30 and then adjust the temperature of the heat transfer oil which enters the sealing device 30, the outlet of the oil pump 42 is connected with the inlet of the sealing device 30, the conduction oil is pressurized by the oil pump 42 to be delivered into the inlet of the sealing means 30 and then enters the flow passage 211 from one end of the flow passage 211, so that the conduction oil can be cyclically delivered to the sealing means 30 and returned to the temperature control means 40, ensuring that the temperature of the screw 21 can be stably adjusted.

In one embodiment, referring to fig. 1, the cooling mechanism 43 may be a heat exchanger, the heat exchanger exchanges heat with water and heat transfer oil, and the heat transfer oil transfers heat to water after the heat transfer oil flows into the heat exchanger, so as to reduce the temperature of the heat transfer oil. The heat exchanger is used as the cooling mechanism 43, which is simple, convenient and easy to operate.

In one embodiment, the cooling mechanism 43 may be a heat sink or other device capable of reducing the temperature, and may also function to reduce the temperature of the thermal oil.

In one embodiment, referring to fig. 1 and 2, the flow channel 211 in the screw 21 is U-shaped, that is, a U-shaped flow channel 211 is formed inside the screw 21 and can allow heat conduction oil to pass through, two ends of the U-shaped flow channel 211 are both located at one end of the screw 21 close to the driving device 10, one end of the flow channel 211 is used for guiding the heat conduction oil in the sealing device 30 into the flow channel 211, and the other end of the flow channel 211 is used for discharging the heat conduction oil flowing into the flow channel 211 into the sealing device 30. The U-shaped flow channel 211 is convenient for heat conduction oil to flow into and out of the screw rod 21, and a better cooling effect can be achieved.

In one embodiment, the flow channel 211 in the screw 21 is V-shaped, that is, a V-shaped flow channel 211 is formed inside the screw 21, and the heat transfer oil can pass through the V-shaped flow channel 211, two ends of the V-shaped flow channel 211 are both located at one end of the screw 21 close to the driving device 10, and the V-shaped flow channel 211 can facilitate the heat transfer oil to flow into and out of the screw 21, so as to achieve a better cooling effect.

In one embodiment, a plurality of flow channels 211 may be formed in each screw 21, that is, heat transfer oil may flow into the plurality of flow channels 211 at the same time, so that the cooling efficiency of the screw 21 may be improved.

In one embodiment, the flow channel 211 in the screw 21 extends from one end of the screw 21 close to the driving device 10 to the other end of the screw 21 along the length direction of the screw 21, and at this time, the moving path of the heat transfer oil inside the screw 21 is almost the length of the whole screw 21, so that the cooling effect of the screw 21 is better, and the problem of over-plasticizing of the processing material due to over-high temperature of the screw 21 is better avoided.

In one embodiment, referring to fig. 2 and 3, the sealing device 30 includes a sealing box 31, a groove 212 is formed at an end of each screw 21 close to the driving device 10, and the sealing box 31 is engaged in the groove 212, so that the sealing box 31 can be better fixed on the screw 21, and a sealing space can be formed in the sealing device 30.

In one embodiment, the sealing device 30 includes a sealing ring, and when the sealing box 31 is clamped in the groove 212, the sealing ring is disposed between the groove 212 and the sealing box 31, so that a better clamping effect can be achieved between the sealing box 31 and the screw 21, and the sealing device 30 has a better sealing effect.

In one embodiment, referring to fig. 3, a partition 311 is disposed in the seal box 31, the partition 311 divides the space in the seal box 31 into two sub-chambers, one sub-chamber communicates the inlet of the flow passage 211 with the outlet of the oil pump 42, and the other sub-chamber communicates the outlet of the flow passage 211 with the inlet of the oil tank 41, that is, the inlet and the outlet of the sealing device 30 are disposed on the two sub-chambers, that is, the partition 311 separates the inlet and the outlet of the sealing device 30.

In one embodiment, the temperature controller 44 of the temperature control device 40 includes a temperature sensor provided at an outlet of the oil pump 42 for monitoring the temperature of the thermal oil flowing out from the oil pump 42, and a controller electrically connected to the controller for adjusting the temperature of the thermal oil transferred into the sealing device 30, and the controller electrically connected to the oil pump 42.

In one embodiment, referring to fig. 1, the driving device 10 includes a motor 11 and a reducer 12 connected to the motor 11, wherein the reducer 12 is connected to two screws 21. The motor 11 is a power source of the twin-screw extruder 100, the motor 11 is connected with the speed reducer 12, and the speed reducer 12 is connected with the two screws 21 of the mixing and extruding device, so that power is transmitted to the two screws 21 to drive the two screws 21 to rotate.

In one embodiment, the twin-screw extruder 100 includes a support base 50, and the driving device 10 and the mixing device 20 are disposed on the support base 50, so that the driving device 10 and the mixing device 20 can be disposed more stably.

In one embodiment, the screw threads of the two screws 21 can be arranged in the same direction, the two screws 21 with the same screw threads can be meshed with each other in the same direction to mix and knead the materials, and the two screws 21 with the same screw threads are provided with the flow passages 211 which can play a role in adjusting the temperature of the screws 21.

In one embodiment, the screw threads of the two screws 21 can be arranged in different directions, the two screws 21 arranged in different directions can mesh with each other in different directions to mix the materials, and the flow passages 211 are arranged in the two screws 21 arranged in different directions to also adjust the temperature of the screws 21.

In one embodiment, referring to fig. 1, the mixing device 20 includes a feeding device 23, the feeding device 23 includes a hopper 231, a stirring motor 232, and a stirring element, the hopper 231 is disposed on the top of the end of the barrel 22 close to the driving device 10, the stirring motor 232 is mounted on the periphery of the hopper 231, the stirring element is disposed in the hopper 231, the stirring motor 232 is connected to the stirring element, and the stirring motor 232 provides a driving force for the stirring element to drive the stirring element to rotate. The hopper 231 is used for feeding the mixing material for producing plastic granules into the cylinder 22, and is equivalent to the raw material inlet, and the stirring motor 232 and the stirring member are arranged at the hopper 231, so that the mixing material can be prevented from caking before entering the cylinder 22, and the mixing material can be pushed into the cylinder 22.

In one embodiment, the stirring member of the feeding device 23 may be a stirring rod, a stirring blade or other tool that can be used for stirring.

The above description is intended only to serve as an alternative embodiment of the present application, and should not be taken as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A twin-screw extruder, characterized in that: the method comprises the following steps:

a drive device;

the mixing device comprises two screws which are connected with the driving device and are arranged in parallel and a machine barrel which is sleeved outside each screw, a flow channel is formed in each screw along the length direction of the screw, and two ends of each flow channel are located at one end of each screw close to the driving device;

the sealing device is used for hermetically connecting one end of the screw close to the driving device so as to supply heat conduction oil to the flow channel and receive the heat conduction oil returned by the flow channel;

and the temperature control device is used for conveying heat conduction oil to the sealing device.

2. The twin screw extruder of claim 1, wherein: the temperature control device comprises an oil tank for storing heat conduction oil, an oil pump for conveying the heat conduction oil, a cooling mechanism for reducing the temperature of the heat conduction oil and a temperature controller for monitoring and entering the heat conduction oil temperature in the flow channel to control the operation of the oil pump, wherein the outlet of the sealing device is connected with the oil tank, the inlet of the oil pump is connected with the outlet of the cooling mechanism, the outlet of the oil pump is connected with the inlet of the sealing device, the inlet of the cooling mechanism is connected with the oil tank, and the temperature controller is arranged at the outlet of the oil pump.

3. The twin screw extruder of claim 2, wherein: the cooling mechanism is a heat exchanger; or the cooling mechanism is a radiator.

4. The twin screw extruder of claim 1, wherein: the flow channel is U-shaped or V-shaped.

5. The twin screw extruder of claim 1, wherein: a plurality of flow passages are arranged in each screw.

6. The twin screw extruder of claim 2, wherein: the temperature controller is including locating the temperature sensor of oil pump export and with the controller that the temperature sensor electricity is connected, the oil pump with the controller electricity is connected.

7. The twin screw extruder of claim 1, wherein: the sealing device is a sealing box, a groove is formed in one end, close to the driving device, of each screw, and the sealing box is clamped in the groove.

8. The twin-screw extruder of any one of claims 1 to 7, wherein: the mixing device comprises a feeding device, wherein the feeding device comprises a hopper arranged at the top of one end of the machine barrel close to the driving device, a stirring motor arranged on the periphery of the hopper and a stirring piece arranged in the hopper and connected with the stirring motor.

9. The twin screw extruder of claim 8, wherein: the threads of the two screws are arranged in the same direction, or; the threads of the two screws are arranged in different directions.

10. The twin-screw extruder of any one of claims 1 to 7, wherein: the driving device comprises a motor and a speed reducer connected with the motor, and the speed reducer is connected with the two screw rods.