CN114670365A

CN114670365A - Microwave material drying device and intelligent microwave material drying system

Info

Publication number: CN114670365A
Application number: CN202011545424.8A
Authority: CN
Inventors: 周明庆; 颜荣俊
Original assignee: Precision Machinery Research and Development Center
Current assignee: Precision Machinery Research and Development Center
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2022-06-28

Abstract

The invention discloses a microwave material drying device which comprises a plastic conveying unit and at least one microwave module. The plastic conveying unit comprises a collecting barrel, a feeding pipeline, a feeding screw and a feeding motor, wherein the collecting barrel is communicated with the inside of the feeding pipeline, and the feeding pipeline is provided with a discharge hole. The feeding screw is rotatably arranged in the feeding pipeline and pushes the plastic to move towards the discharge hole, and the feeding motor drives the feeding screw to rotate. The microwave module is erected on the plastic conveying unit and comprises a microwave outer cover and a magnetron, the magnetron is arranged in the microwave outer cover, and the magnetron is driven to generate microwaves to heat the plastic. Through above-mentioned microwave material drying device, can heat plastics effectively and fast, reduce plastics drying time and energy consumption effectively.

Description

Microwave material drying device and intelligent microwave material drying system

Technical Field

The invention relates to a material drying device, in particular to a microwave material drying device and an intelligent microwave material drying system, which can rapidly dry plastics.

Background

Before plastic forming (such as injection molding) is performed, the plastic absorbs moisture, so that a material drying device must be used to dry the plastic to reduce the moisture content of the plastic for different plastics. Traditionally, the material drying machine used is to bring the transport plastics and adopt hot-blast come to carry out drying and heating to plastics with the conveyer, adopts hot-blast drying's mode, owing to belong to indirect heating, its drying time is longer, and the energy consumption is also than higher.

Disclosure of Invention

One of the objectives of the present invention is to improve the existing drying device, and further to provide a microwave drying device, which can rapidly dry the plastic, and further shorten the plastic drying time.

The invention provides a microwave material drying device which comprises a plastic conveying unit and at least one microwave module. The plastic conveying unit comprises a collecting barrel, a feeding pipeline, a feeding screw and a feeding motor, wherein the collecting barrel is arranged above the feeding pipeline and communicated with the inside of the feeding pipeline, and the feeding pipeline is provided with a discharge hole. The feeding screw is rotatably arranged in the feeding pipeline and pushes the plastic to move towards the discharge hole, and the feeding motor is connected with the feeding screw and drives the feeding screw to rotate. The microwave module is erected on the plastic conveying unit and comprises a microwave outer cover and a magnetron, the magnetron is arranged in the microwave outer cover, and the magnetron can be driven to generate microwaves to heat the plastic in the plastic conveying unit.

Through above-mentioned microwave material drying device, because adopt the microwave module to come the plastics of direct inside to plastics conveying unit to carry out microwave heating, microwave heating belongs to direct heating, can heat plastics effectively and fast, can reduce plastics drying time and energy consumption effectively.

In one aspect, in order to regulate and control the water content of the plastic, a plurality of groups of microwave modules can be adopted and are erected at different positions of the plastic conveying unit, for example, one of the microwave modules can be erected on a feeding channel of the plastic conveying unit, and the other microwave module is erected on a connecting pipeline which is connected with a discharge port of the feeding channel and the infrared drying device.

In another aspect, in order to perform intelligent feedback control on the plastic drying operation, the microwave material drying device can further comprise a controller and a temperature sensor. The controller is electrically connected with the temperature sensor, the feeding motor and the microwave module, the temperature sensor senses the temperature of the plastic in the feeding pipeline, and the controller controls the rotating speed of the feeding motor and the microwave output power of the microwave module in a feedback control mode according to the temperature of the plastic.

In order to more effectively control the water content of the plastic, the microwave material drying device can be additionally provided with a water content meter for detecting the water content of the plastic in the feeding pipeline, and the controller can control the rotating speed of the feeding motor and the output power of the microwave module in a feedback control mode according to the temperature and the water content of the plastic.

The invention also provides an intelligent microwave material drying system which comprises the microwave material drying device and a database. The database is provided with a plurality of groups of plastic information and a plurality of groups of process parameters corresponding to the plurality of groups of plastic information, and the controller is electrically connected with the database and controls the rotating speed of the feeding motor and the output power of the microwave module according to the plurality of groups of process parameters of the database.

Drawings

The detailed construction, features, assembly or use of the microwave material baking apparatus will be described in the following detailed description, however, it should be understood that the following detailed description and accompanying drawings are only illustrative and should not be used to limit the claims of the present invention, wherein:

FIG. 1 is a schematic view of a microwave material drying apparatus of an embodiment;

FIG. 2 is a block diagram of the components of an embodiment of an intelligent microwave material drying system; and

fig. 3 is a block diagram of a control circuit of the microwave module according to an embodiment.

[ description of main reference symbols in the drawings ]

1 microwave material drying system

10 microwave material drying device

20 Plastic transfer Unit

21 collecting bucket

22 feeding pipeline

221 feed inlet

222 discharge hole

23 feeding screw

24 feeding motor

241 output shaft

242 pulley

243 belt

25 connecting pipeline

26 temperature sensor

27 water content meter

28 controller

30 microwave module

31 microwave outer cover

32 magnetron

33 transistor

34 AC power supply

35 high-voltage converter

36 waveguide tube

40 database

Detailed Description

The technical contents and features of the present invention will be described in detail below with reference to several embodiments, and directional terms such as "upper", "lower", "inner", "outer", "top", "bottom", etc. referred to in this specification are only exemplary terms based on a normal use direction, and are not intended to limit the scope of protection.

For a detailed description of the technical features of the present invention, reference will now be made to the following examples, taken in conjunction with the accompanying drawings, in which:

as shown in fig. 1 and fig. 2, the present embodiment provides an intelligent microwave material drying system 1, which includes a microwave material drying device 10 and a database 40.

The microwave drying device 10 includes a plastic conveying unit 20 and one or more sets of microwave modules 30 (two sets of microwave modules 30 in this embodiment).

The plastic conveying unit 20 includes a collecting barrel 21, a feeding pipeline 22, a feeding screw 23, a feeding motor 24 and a connecting pipeline 25. The collecting barrel 21 is used for storing plastic (i.e. wet plastic) which is not subjected to material drying operation, and the collecting barrel 21 is arranged above the feeding pipeline 22 and communicated with the inside of the feeding pipeline 22. The feeding pipe 22 has a feeding port 221 and a discharging port 222, and the collecting barrel 21 is inserted into the feeding port 221. The feeding pipeline 22 is further provided with a temperature sensor 26 and a water content meter 27 for measuring the temperature and the water content of the plastic inside the feeding pipeline 22, respectively, it should be noted that the temperature of the plastic is usually in a certain relation with the water content of the plastic, and the water content of the plastic can be indirectly known by measuring the temperature of the plastic, so that the temperature sensor 26 or the water content meter 27 can be alternatively arranged. The feeding screw 23 is rotatably disposed inside the feeding pipe 22, and the feeding screw 23 has a plurality of blades, and by rotating the feeding screw 23, the plastic can be uniformly stirred and pushed from the position of the feeding port 221 to the discharging port 222. The feeding motor 24 is disposed below the feeding pipeline 22, the feeding motor 24 has an output shaft 241, and the output shaft 241 is connected to the feeding screw 23 through a set of belt pulleys 242 (including a belt 243), so that the feeding motor 24 can drive the feeding screw 23 to rotate through the set of belt pulleys 242. One end of the connecting pipeline 25 is connected to the discharge port 222, and the other end is connected to an infrared drying device (not shown), and for the technology of the infrared drying device, reference may be made to the new patent No. M587111 of taiwan certificate. It should be noted that the other end of the connecting pipeline 25 may be connected to the hot air dryer instead or directly to the injection molding machine, and the connection object of the connecting pipeline 25 in the present invention is not limited to the embodiment.

The two sets of microwave modules 30 are designed in a modularized manner and are respectively erected on the feeding pipeline 22 and the connecting pipeline 25, each microwave module 30 includes a microwave outer cover 31, a magnetron 32, a waveguide 36 and a microwave driver (not shown), the magnetron 32 is disposed in the microwave outer cover 31, and the microwave driver is configured to drive the magnetron 32, so that the magnetron 32 can generate microwaves, and the generated microwaves are transmitted to the plastic inside the feeding pipeline 22 (or the connecting pipeline 25) through the waveguide 36, thereby performing microwave heating on the plastic. Referring to fig. 3, the control circuit of the microwave module 30 may include a high voltage converter 35 (essentially, a transformer) for boosting an ac signal of an ac power supply 34 and inputting the boosted ac signal to the magnetron 32, so that the magnetron 32 outputs a microwave signal, and a ground terminal of the magnetron 32 is connected to a power transistor 33 for PWM control, and the control of the microwave output power is achieved by adjusting a duty ratio of a waveform of the ac signal. It should be noted that, since the microwave modules are of modular design, in some cases, two sets of microwave modules 30 may be provided, and two sets of microwave modules 30 may be mounted on the feeding line 22 of the plastic conveying unit 20.

The database 40 is a database 40 capable of performing general calculations and queries, and has a plurality of sets of plastic information and a plurality of sets of process parameters corresponding to the plurality of sets of plastic information built therein.

It should be noted that, in order to intelligently control the material drying operation, the microwave material drying device 10 is further provided with a controller 28, and the controller 28 is electrically connected with the temperature sensor 26, the moisture content meter 27, the feeding motor 24 and the microwave module 30. The controller 28 controls the rotation speed of the feed motor 24 in a feedback control manner according to the sensed temperature and moisture content of the plastic, and the microwave output power of the microwave module 30 will be described in the following paragraphs. In addition, the controller 28 is electrically connected to the database 40 and controls the rotational speed of the feed motor 24 and the output power of the microwave module 30 according to the provided process parameters of the database 40. The controller 28 can control the duty ratio of the waveform of the ac signal, and the controller 28 can also adjust the output power of the microwave module 30 in a gain control manner.

In the material drying operation, when the moist plastic does not enter the infrared material drying device or directly enters the injection molding machine, the microwave material drying device 10 of the embodiment is adopted to perform microwave heating on the plastic, so that the plastic can be heated quickly and efficiently, the material drying time can be effectively saved, the problem of heat dissipation is solved in a microwave heating mode, the energy consumption can be effectively reduced, and the electricity-saving effect is improved.

Finally, it should be noted that the above-mentioned embodiments of the present invention are merely examples, and are not intended to limit the scope of the present invention, and that various modifications and changes in the structure without departing from the spirit of the invention or other equivalents thereof may be made without departing from the spirit of the invention.

Claims

1. A microwave material drying device comprises:

the plastic conveying unit comprises a collecting barrel, a feeding pipeline, a feeding screw and a feeding motor, wherein the collecting barrel is arranged above the feeding pipeline and is communicated with the inside of the feeding pipeline, the feeding pipeline is provided with a discharge hole, the feeding screw is rotatably arranged in the feeding pipeline and pushes plastic to move towards the discharge hole, and the feeding motor is connected with the feeding screw and drives the feeding screw to rotate;

at least one microwave module, which is arranged on the plastic transmission unit and comprises a microwave outer cover and a magnetron, wherein the magnetron is arranged in the microwave outer cover and can be driven to generate microwaves to heat the plastic in the plastic transmission unit.

2. The microwave material drying device according to claim 1, wherein the feeding motor is disposed below the feeding pipeline, and the feeding motor drives the feeding screw to rotate through a set of pulleys.

3. The microwave drying device according to claim 1, wherein the plastic conveying unit further comprises a connecting pipeline, opposite ends of the connecting pipeline are respectively connected to the discharging port and an infrared drying device, the number of the at least one microwave module is two, and the two microwave modules are respectively disposed on the feeding pipeline and the connecting pipeline.

4. The microwave material drying device of claim 1, further comprising a controller and a temperature sensor, wherein the controller is electrically connected to the temperature sensor, the feeding motor and the at least one microwave module, the temperature sensor senses the temperature of the plastic in the feeding pipeline, and the controller controls the rotation speed of the feeding motor and the microwave output power of the at least one microwave module in a feedback control manner according to the temperature of the plastic.

5. The microwave material drying device according to claim 4, further comprising a moisture content meter, the moisture content meter is disposed on the feeding device and detects moisture content of the plastic in the feeding pipeline, the controller is electrically connected to the moisture content meter, and the controller controls the rotation speed of the feeding motor and the microwave output power of the at least one microwave module in a feedback control manner according to the temperature and moisture content of the plastic.

6. The microwave material drying apparatus of claim 4, wherein the controller is configured to increase or decrease the microwave output power of the at least one microwave module in a gain control manner.

7. A microwave drying device as defined in claim 1, wherein the magnetron receives a high voltage ac signal to generate the microwave signal, and a power transistor is connected to a ground terminal of the magnetron, and the microwave output power of the microwave module is controlled by controlling a duty ratio.

8. The microwave drying device according to claim 1, wherein the at least one microwave module is plural in number, and the microwave modules are mounted on the feeding line of the plastic conveying unit.

9. An intelligent microwave material drying system comprises the microwave material drying device according to claim 5 and a database, wherein the database is provided with a plurality of groups of plastic information and a plurality of groups of process parameters corresponding to the plurality of groups of plastic information, and the controller is electrically connected with the database and controls the rotating speed of the feeding motor and the microwave output power of the at least one microwave module according to the plurality of groups of process parameters of the database.