CN221678002U - An extrusion processing device and its melt index control system - Google Patents

Abstract

The utility model discloses an extrusion processing device and a melt index control system thereof, and belongs to the technical field of plastic processing devices. The melt index control system comprises a drainage device, a conveying device, a detection device and a control device; the drainage device is connected to the drainage hole of the extruder body and is used for receiving the molten material flowing out along the drainage hole of the extruder; the conveying device is connected to the outlet side of the drainage device and conveys the molten material to the side of the detection device, and the detection device is used for detecting the melt index of the molten material; the control device is connected with the detection device and controls the feeding amount of the extruder according to the melt index of the detection device. The utility model solves the problem that the melt index adjustment in the existing plastic extrusion processing process consumes long time.

Description

An extrusion processing device and its melt index control system

Technical Field

The utility model relates to the technical field of extrusion processing of modified plastics, in particular to a system for online controlling the melting index during the extrusion processing.

Background Art

Using a loss-in-weight scale and a twin-screw extruder for blending and modification is one of the most commonly used processing methods in the plastics industry. However, it often takes 30 to 45 minutes to test the melt index during the blending and modification process. Once the melt index is unqualified, it takes another 20 to 30 minutes to adjust it. When the melt index is unqualified, it is necessary to adjust the feed ratio to adjust the melt index, which still depends to a large extent on the experience of relevant personnel. The unqualified products produced in the middle generally need to be re-melted and granulated or blended in batches, which consumes a lot of energy, takes a long time, and is wasteful.

At present, the methods for online control or prediction of melt index are mostly concentrated in the field of polymerization, and are rarely reported in the field of extrusion processing. Therefore, a control system for online adjustment of the melt index of modified plastics during extrusion processing is provided.

Utility Model Content

The technical problem to be solved by the utility model is that it takes a long time to adjust the melting index in the existing plastic extrusion process.

In view of the above technical problems, the utility model provides the following technical solutions:

A melt index control system for an extrusion processing device comprises: a drainage device, a conveying device, a detection device and a control device; the drainage device is connected to the drainage hole of the extruder body and is used to receive the molten material flowing out along the drainage hole of the extruder; the conveying device is connected to the outlet side of the drainage device and conveys the molten material to the detection device side, and the detection device is used to detect the melt index of the molten material; the control device is connected to the detection device and controls the feed amount of the extruder according to the melt index of the detection device.

In some implementation modes of the present invention, the conveying device includes a casing and a spiral conveying rod located in the casing.

Some embodiments of the present invention further include a temperature control unit, which includes a heating module and a cooling module. The heating module is used to heat the molten material in the casing, and the cooling module is used to cool the molten material in the casing.

Some embodiments of the present invention further include a pressurizing device, which is used to pressurize the material in the casing along its conveying direction.

In some implementation modes of the present invention, the temperature control unit and the pressurizing device are located at the rear side of the conveying device.

In some embodiments of the utility model, the drainage device includes a drainage tube detachably connected to the drainage hole, and the drainage tube is provided with a control valve for controlling the on-off of the drainage tube.

In some implementation modes of the utility model, the control device is also used to control the control valve on the drainage tube according to the melting index of the detection device.

Some implementations of the present invention further include a material recovery device, which is located at the lower side of the housing and at the rear end of the detection device and is used to receive the molten material after detection.

The utility model also provides an extrusion processing device, comprising an extruder body and the melt index control system.

In some implementation modes of the present invention, at least one drainage hole is provided on the side wall of the extruder body close to its discharge head.

The technical solution of the utility model has the following technical effects compared with the prior art:

In the melt index control system of the extrusion processing device provided by the utility model, the melted material is led out from the extruder body to realize online monitoring of the melted material, and the control device controls the feeding amount of the extruder according to the melt index detected by the detection device. The control system can realize real-time monitoring of the melt index of the molten material in the extruder, and at the same time can realize the control of the feeding amount of the extruder, and the whole control system responds quickly and has high detection efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of the present invention, wherein:

FIG1 is a schematic structural diagram of a specific embodiment of an extrusion processing device provided by the utility model;

FIG. 2 is a schematic structural diagram of a specific implementation of a conveying device in an extrusion processing device provided by the utility model.

DETAILED DESCRIPTION

The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

As shown in Figure 1, a specific embodiment of the extrusion processing device provided by the utility model is shown. The device includes an extruder body 10 for user blending and modification and a melt index control system for monitoring the melt index of the melt in the extruder body 10. The melt index control system is used to control the feed amount of the extruder according to the melt index of the melt.

As shown in FIG1 , a specific implementation of the above-mentioned melt index control system is shown, which includes: a drainage device 100, a conveying device 200, a detection device 300 and a control device 400; the drainage device 100 is connected to the drainage hole of the extruder body 10, and is used to receive the molten material flowing out along the drainage hole of the extruder; the conveying device 200 is connected to the outlet side of the drainage device 100 and conveys the molten material to the detection device 300 side, and the detection device 300 is used to detect the melt index of the molten material; the control device 400 is connected to the detection device 300 and controls the feed rate of the extruder according to the melt index of the detection device 300.

The above-mentioned melt index control system realizes online monitoring of the molten material by leading the molten material from the extruder body 10, wherein the conveying device 200 is used to receive the molten material led out of the extruder body 10 and convey it to the detection device 300 side, and the control device 400 controls the feed amount of the extruder according to the melt index detected by the detection device 300. When the detected melt index exceeds the set threshold, the control signal is fed back to the loss-in-weight scale controller where the material raw material supply device is located, and the feed amount of the loss-in-weight scale is adjusted to realize the control of the feed amount of the extruder until the melt index reaches the set range. The control system can realize real-time monitoring of the melt index of the molten material in the extruder, and at the same time can realize the control of the feed amount of the extruder. The whole control system responds quickly and has high detection efficiency.

Specifically, in an optional embodiment, as shown in FIG2 , the conveying device 200 includes a housing 201 and a screw conveying rod 202 located in the housing 201, and the screw conveying rod 202 has a spiral groove, which is suitable for continuing to convey the molten material with higher viscosity to the subsequent detection device 300. The screw conveying rod 202 can adopt a screw conveying mode such as single screw conveying, double screw conveying, and multi-screw conveying.

Specifically, in order to make the state of the molten material drawn out from the extruder body 10 consistent with the state in the extruder body 10; the melt index control system also includes a temperature control unit, the temperature control unit includes a heating module 500 and a refrigeration module 600, the heating module 500 is used to heat the molten material in the housing 201, and the heating method of the heating module 500 includes but is not limited to electric heating and oil heating, for example, winding an electric heating wire on the housing 201 to achieve electric heating, or through a heating chamber surrounding the outside of the housing 201 and filled with a liquid heating medium (such as oil, etc.) to achieve oil heating; the refrigeration module 600 is used to cool the molten material in the housing 201, and the cooling method of the refrigeration module 600 includes but is not limited to water cooling and air cooling, for example, through a cooling chamber surrounding the outside of the housing 201 and filled with a cooling medium to achieve water cooling; or through an air cooling pipe connected to the housing 201 to achieve air cooling. By adjusting the temperature of the molten material in the housing 201 to be substantially consistent with the molten material in the extruder body 10, the detection accuracy of the detection device 300 is higher.

Specifically, in an optional embodiment, the melt index control system further includes a pressurizing device 700, which is used to pressurize the material in the housing 201 along its conveying direction to achieve the flow of the molten material at a certain flow rate. It can make the flow state of the molten material in the housing 201 consistent with the flow state of the fluid in the extruder body 10, so as to improve the detection accuracy of the detection device 300. Specifically, the pressurizing device 700 can adopt a pressurizing method such as pneumatic pressurization and electric pressurization.

Specifically, in an optional embodiment, the temperature control unit and the pressurizing device 700 are located on the rear side of the conveying device 200. The molten material is conveyed backward by the conveying device 200 to the rear side of the casing 201 and passes through the temperature control unit and the pressurizing device 700. The molten material entering the front side of the detection device 300 can be consistent with the material state in the extruder body 10, so that the detection accuracy of the detection device 300 is guaranteed.

Specifically, in an optional embodiment, the drainage device 100 includes a drainage tube 101 detachably connected to the drainage hole, and the drainage tube 101 is provided with a control valve 102 for controlling its on and off. The start or stop of the melt index control system can be controlled by opening and closing the control valve 102.

Specifically, the control device 400 is also used to control the control valve 102 on the drainage tube 101 according to the melt index of the detection device 300. When the detection device 300 detects that the change in the melt index of the material within the set time is less than the preset value, at this time, the material in the extruder is in a stable state, and the control valve 102 can be controlled to be closed; after a set interval, for example 1-2 hours, the control valve 102 is opened to detect the melt index of the material again.

Specifically, in an optional embodiment, the control system further includes a material recovery device 800, which is connected to the rear end of the detection device 300 and is used to receive the detected molten material for subsequent use. The material recovery device 800 includes a recovery box located at the lower end of the discharge port of the housing 201.

Specifically, in an optional embodiment, at least one drainage hole is provided on the side wall of the extruder body 10 close to its discharge head 11. By providing the drainage hole close to the discharge head 11, the state of the detected material can be consistent with the material state on the discharge side of the extruder, which can significantly reduce the range and variance of the melt index during plastic production.

Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present utility model.

Claims (10)

1. A melt index control system for an extrusion processing device, characterized in that it comprises: a drainage device, a conveying device, a detection device and a control device; The drainage device is connected to the drainage hole of the extruder body and is used to receive the molten material flowing out along the drainage hole of the extruder; The conveying device is connected to the outlet side of the drainage device and conveys the molten material to the detection device side, and the detection device is used to detect the melting index of the molten material; The control device is connected to the detection device and controls the feeding amount of the extruder according to the melt index of the detection device. 2. The melt index control system of the extrusion processing device according to claim 1, characterized in that the conveying device includes a casing and a spiral conveying rod located in the casing. 3. The melt index control system of the extrusion processing device according to claim 2 is characterized in that it also includes a temperature control unit, the temperature control unit includes a heating module and a refrigeration module, the heating module is used to heat the molten material in the casing, and the refrigeration module is used to cool the molten material in the casing. 4. The melt index control system of the extrusion processing device according to claim 3 is characterized in that it also includes a pressurizing device, which is used to pressurize the material in the casing along its conveying direction. 5. The melt index control system of the extrusion processing device according to claim 4, characterized in that the temperature control unit and the pressurizing device are located at the rear side of the conveying device. 6. The melt index control system of the extrusion processing device according to claim 1 is characterized in that the drainage device includes a drainage tube detachably connected to the drainage hole, and the drainage tube is provided with a control valve for controlling the on-off of the drainage tube. 7. The melt index control system of the extrusion processing device according to claim 6, characterized in that the control device is also used to control the control valve on the drainage pipe according to the melt index of the detection device. 8. The melt index control system of the extrusion processing device according to claim 2 is characterized in that it also includes a material recovery device, which is located at the lower side of the casing and the rear end of the detection device, and is used to receive the molten material after detection. 9. An extrusion processing device, characterized in that it comprises an extruder body and a melt index control system according to any one of claims 1 to 8. 10 . An extrusion processing device according to claim 9 , characterized in that at least one drainage hole is provided on the side wall of the extruder body close to its discharge head.