阅读说明：本技术 一种消失模模样微波烘干房及微波烘干方法 (Lost foam pattern microwave drying room and microwave drying method ) 是由 鲍志敏 张谦 张堃 于 2019-12-04 设计创作，主要内容包括：本发明提供一种消失模模样微波烘干房及微波烘干方法,包括：烘干房本体、设于所述烘干房本体顶部的若干个排湿孔、设于所述烘干房本体底部的若干个送风口、设于所述烘干房本体内部两侧的磁控管及设于所述烘干房本体内部的温度传感器；其中,所述烘干房本体两端分别设有进料口及出料口,所述进料口及所述出料口通过传送带进行连接。本发明的有益效果在于烘干周期缩短,烘干时长由原7日缩短为10分钟～20分钟,模型干燥总时长大大缩短；使用微波进行白模烘干,进行低温及合理的空气流速进行干燥；不会因温度过高造成模型软化变形；采用微波烘干后,烘干设备可实现连续化、全自动运行,生产效率及自动化程度大幅提高。(The invention provides a lost foam pattern microwave drying room and a microwave drying method, wherein the method comprises the following steps: the drying room comprises a drying room body, a plurality of moisture exhaust holes arranged at the top of the drying room body, a plurality of air supply outlets arranged at the bottom of the drying room body, magnetrons arranged at two sides in the drying room body and a temperature sensor arranged in the drying room body; wherein, stoving room body both ends are equipped with feed inlet and discharge gate respectively, the feed inlet reaches the discharge gate passes through the conveyer belt and connects. The invention has the advantages that the drying period is shortened, the drying time is shortened from the original 7 days to 10-20 minutes, and the total drying time of the model is greatly shortened; drying the white mold by using microwaves at a low temperature and a reasonable air flow rate; the model can not be softened and deformed due to overhigh temperature; after the microwave drying is adopted, the drying equipment can realize continuous and full-automatic operation, and the production efficiency and the automation degree are greatly improved.)

1. The utility model provides a disappearance mould pattern microwave stoving room, its characterized in that, microwave stoving room includes: the drying room comprises a drying room body (1), a plurality of moisture exhaust holes (101) arranged at the top of the drying room body (1), a plurality of air supply outlets (102) arranged at the bottom of the drying room body (1), magnetrons (2) arranged at two sides in the drying room body (1) and a temperature sensor (3) arranged in the drying room body (1);

the drying room comprises a drying room body (1), and is characterized in that a feeding hole (103) and a discharging hole (104) are formed in two ends of the drying room body (1) respectively, the feeding hole (103) and the discharging hole (104) are connected through a conveying belt (4), a diffuser (1021) is installed at an air supply opening (102), and the diffuser (1021) keeps air flow inside the drying room body (1) to be vertical or horizontal air flow.

2. The microwave drying room for the lost foam pattern according to claim 1, wherein the magnetrons (2) are divided into three groups, and are sequentially distributed along the channels of the feeding port (103) and the discharging port (104).

3. The microwave oven-drying room of the lost foam pattern is characterized in that the emission power of each magnetron (2) is 0.8-1.2 kilowatts, 12-15 magnetrons are installed, and the microwave frequency is 2450 +/-50 MHz.

4. The microwave drying room for the lost foam pattern is characterized in that an induced draft fan (1011) and an adjustable air door (1012) are installed on the moisture exhaust hole (101).

5. A microwave drying room for lost foam patterns according to claim 1, characterized in that said air supply outlet is installed below said conveyor belt (4).

6. The microwave drying room for the lost foam pattern according to claim 1, further comprising an equipment console (105), wherein the equipment console (105) comprises a liquid crystal touch screen and a camera connected with the liquid crystal touch screen, and the camera is installed inside the microwave drying room body for the lost foam pattern.

7. The microwave drying room for the lost foam pattern as claimed in claim 4, wherein the induced draft fan (1011) has an air volume of 3000 cubic meters per hour to 6500 cubic meters per hour and a power of 0.55 kilowatt to 0.75 kilowatt.

8. The microwave drying method for drying the lost foam pattern in the microwave drying room according to claims 1 to 7 is characterized in that the lost foam pattern is conveyed into the drying room body by a conveyor belt arranged at the feed inlet, the minimum drying temperature is 30-34 ℃, the maximum drying temperature is 35-42 ℃, the air flow velocity in the drying room body is 0.3-0.7 m/s, the weight of the lost foam pattern per drying is 4.8-6.5 kg, and each drying period is 10-20 mm; when the temperature of the drying room is lower than the highest drying temperature, heating; and when the temperature of the drying room reaches the maximum drying temperature, stopping heating.

9. The microwave drying method for the lost foam pattern according to claim 8, wherein the temperature control method comprises the following steps:

step S1, when the temperature monitored by the temperature sensor is 30-35 ℃, the power of the magnetron is reduced to 50%;

step S2, when the temperature monitored by the temperature sensor is between 32 ℃ and 42 ℃, the power of the magnetron is reduced to 30 percent until the temperature is raised to the highest drying temperature;

step S3, when the temperature monitored by the temperature sensor is higher than the highest temperature, the magnetron stops running;

when the temperature drops below the minimum temperature for drying again, the magnetron resumes operation, and steps S1 to S3 are repeated.

10. The microwave drying method of the lost foam pattern according to claim 8, wherein the flow velocity of the air flow inside the drying room body is 0.3 m/s to 0.65 m/s.

Technical Field

The invention relates to the field of drying of lost foam patterns, in particular to a lost foam pattern microwave drying room and a microwave drying method.

Background

The drying method of the white mold sample (EPS or STMMA and the like) which is commonly adopted in the lost foam casting industry is natural ventilation drying or heating ventilation drying, the drying period of the drying method is generally longer, and the white mold sample can be dried for 7 to 30 days to reduce the water content in the white mold sample to the minimum level or the water content required by production.

The main causes of the inefficient drying are: the heat transfer efficiency is low. The heat transfer is carried out by adopting air as a heat medium. The heating is performed from the surface of the white mold to the inside gradually, since the heat transfer efficiency is generally low (the material can be used as a heat insulating material) for the model material used in casting of both EPS and STMMA or other lost forms. Tests show that the internal temperature of the furnace is equal to or higher than 10 mm after being heated for 1 hour by using air circulation at the temperature of 45 ℃. The white mould has compact structure and slow speed of water analysis. And in the middle and later stages of drying, the migration distance between the drying interface and the water inside the model is continuously prolonged, and the drying speed is continuously reduced.

Disclosure of Invention

The invention provides a lost foam pattern microwave drying room and a microwave drying method, and aims to solve the technical problem that the drying efficiency of a lost foam pattern in the prior art is low.

The specific technical scheme is as follows:

the utility model provides a disappearance mould mode appearance microwave stoving room, its difference lies in, microwave stoving room includes: the drying room comprises a drying room body, a plurality of moisture exhaust holes arranged at the top of the drying room body, a plurality of air supply outlets arranged at the bottom of the drying room body, magnetrons arranged at two sides in the drying room body and a temperature sensor arranged in the drying room body;

the drying room comprises a drying room body and is characterized in that a feeding hole and a discharging hole are formed in two ends of the drying room body respectively, the feeding hole and the discharging hole are connected through a conveying belt, and an air diffuser is installed at an air supply opening and keeps airflow in the drying room body to be vertical or horizontal airflow.

Furthermore, the magnetrons are divided into three groups and are sequentially distributed on the channels of the feed inlet and the discharge outlet.

Furthermore, the emission power of each magnetron control is 0.8-1.2 kilowatts, 12 to 15 magnetrons are installed, and the microwave frequency is 2450 +/-50 MHz.

Furthermore, a draught fan and an adjustable air door are installed on the moisture exhaust hole.

Further, the air supply outlet is installed below the conveyor belt.

Further, disappearance mould appearance microwave drying room still includes the equipment control platform, the equipment control platform include the liquid crystal touch-sensitive screen and with the camera that the liquid crystal touch-sensitive screen is connected, the camera is installed inside disappearance mould appearance microwave drying room body.

Furthermore, the air volume of the induced draft fan is 3000 cubic meters per hour to 6500 cubic meters per hour, and the power is 0.55 kilowatt to 0.75 kilowatt.

A microwave drying method for drying a lost foam pattern by using the microwave drying room is characterized in that the lost foam pattern is conveyed into a drying room body by a conveyor belt arranged at a feed inlet, when the minimum drying temperature is 30-34 ℃, the maximum drying temperature is 35-42 ℃, the airflow velocity in the drying room body is 0.3-0.7 m/s, the weight of the lost foam pattern dried each time is 4.8-6.5 kg, and the drying period is 10 min-20 mm each time; when the temperature of the drying room is lower than the highest drying temperature, heating; and when the temperature of the drying room reaches the maximum drying temperature, stopping heating.

Further, the temperature control steps are as follows:

step S1, when the temperature monitored by the temperature sensor is 30-35 ℃, the power of the magnetron is reduced to 50%;

step S2, when the temperature monitored by the temperature sensor is between 32 ℃ and 42 ℃, the power of the magnetron is reduced to 30 percent until the temperature is raised to the highest drying temperature;

step S3, when the temperature monitored by the temperature sensor is higher than the highest temperature, the magnetron stops running;

when the temperature drops below the minimum temperature for drying again, the magnetron resumes operation, and steps S1 to S3 are repeated.

Furthermore, the running frequency of the conveyor belt is 22 Hz-32 Hz, and the movement speed is 1.0 m/min-2.0 m/min.

Compared with the prior art, the invention has the beneficial effects that: (1) when the drying room is used for drying, the drying period is shortened, the drying time is shortened from the original 7 days to 10-20 minutes through comparison tests, and the total drying time of the model is greatly shortened; (2) after the microwave drying is adopted, the drying equipment can realize continuous and full-automatic operation, and the production efficiency and the automation degree are greatly improved. During drying, microwaves are used for heating, so that the operation energy consumption required in the heating process is reduced, and the energy-saving operation can be realized; (3) the drying mode can meet the requirements of single product mass production and diversified product small-batch order production, the occupied area of microwave heating drying equipment is smaller, and enterprises can reduce the use planning of workshops required for building drying rooms; (4) the multiple groups of magnetrons are separately controlled, and the temperature control is flexible.

Drawings

FIG. 1 is a top view of a lost foam pattern microwave drying room;

FIG. 2 is a top view of a lost foam pattern microwave drying room;

FIG. 3 is a side view internal structure diagram of the lost foam pattern microwave drying room;

in the drawings, the components represented by the respective reference numerals are listed below:

1-drying room body, 101-moisture removal hole, 102-air supply outlet, 103-material inlet, 104-material outlet, 105-equipment console, 2-magnetron, 3-temperature sensor, 4-conveyor belt, 1011-induced draft fan, 1012-adjustable air door and 1021-air diffuser.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.