CN107872906B - Power adjusting method for microwave drying equipment for sand cores of different specifications - Google Patents
Power adjusting method for microwave drying equipment for sand cores of different specifications Download PDFInfo
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- CN107872906B CN107872906B CN201711042536.XA CN201711042536A CN107872906B CN 107872906 B CN107872906 B CN 107872906B CN 201711042536 A CN201711042536 A CN 201711042536A CN 107872906 B CN107872906 B CN 107872906B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/66—Circuits
- H05B6/68—Circuits for monitoring or control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
Abstract
The invention relates to a power adjusting method of microwave drying equipment for sand cores with different specifications in the technical field of microwave drying, which comprises the steps of determining the total power required by drying and the number of microwave magnetrons required to be started according to the maximum three-dimensional size of each concrete sand core to be dried, determining the position and the power of each microwave magnetron required to be started according to the concrete size and shape of the sand core, further controlling the power output power of each magnetron to specifically control the power of each microwave magnetron, realizing uniform distribution of microwaves in a drying chamber, having high drying efficiency and preventing overhigh local temperature, thereby realizing uniform and rapid drying of the sand cores, and being applicable to drying of sand cores with different sizes by adopting the automatic microwave power adjusting process.
Description
Technical Field
The invention relates to the technical field of microwave drying, in particular to a power adjusting method of microwave drying equipment for sand cores of different specifications.
Background
Microwave drying and heating are an industrial-grade high-efficiency heating technology. The sand core for casting and molding needs to be subjected to flow coating, and then the sand core needs to be quickly dried by a quick and efficient heating device to reach the storage and shipping state. The traditional method applies an electric meter dry kiln, has high energy consumption, uneven drying degree of the surface of the sand core, and the sand core is cracked due to overhigh temperature of the surface of the sand core after the sand core is discharged, thereby possibly forming hidden dangers to the life safety of personnel.
The microwave drying equipment mainly depends on a magnetron attached to a high-power microwave heating cavity for heating and depends on a high-power axial flow fan for moisture discharge. Compared with a common electric meter dry kiln, the drying efficiency is higher, the speed is higher, the surface of the dried sand core is uniform and bubble-free, the surface temperature returns quickly after the sand core is taken out of the kiln, microwaves heat the material inside and outside simultaneously in the heating process, and the microwaves directly act on the material, so the microwave heating efficiency is higher than that of conventional heating equipment.
In the prior art, the patent specification with the patent number 201320650139.1, which is applied to the research center of advanced manufacturing technology of mechanical science research institute, discloses a microwave drying device suitable for drying large-size sand molds, and the large-size sand molds are dried by adopting a rotary microwave heating mode. According to the analysis of the control mode, a single high-power magnetron is used for drying, the cavity microwave distribution is uneven, the cavity microwave distribution is not suitable for drying large-variety and multi-specification sand cores, and the sand cores are easily dried unevenly or are locally overheated and fractured. Ningxia shared mold limited company in patent application number 201710378446.1 patent application the specification discloses "a through type microwave drying device for sand mold", carries out power control through the break-make of control magnetron upper, middle and lower three district, nevertheless to the selection of different power, can only rely on the size of vision judgement psammitolite manually, goes to adjust magnetron break-make quantity again and reaches the purpose of control power, and is inefficient, and the cost of labor is high, can't realize intelligent monitoring.
Disclosure of Invention
The invention provides a power adjusting method for microwave drying equipment for sand cores of different specifications, aiming at the problems that the microwave function of a magnetron of the microwave drying equipment is not adjustable and the heating in a microwave drying chamber is not uniform in the prior art, so that the microwave magnetron is selectively started according to the size of the sand core, and the starting power of each magnetron is determined according to the thickness of the sand core.
The invention aims to realize the power regulation method of the microwave drying equipment for sand cores with different specifications, wherein a plurality of microwave magnetrons are uniformly distributed on the side wall in the drying chamber of the microwave drying equipment, and the output power of each microwave magnetron is regulated by a microwave controller according to the following method:
the method comprises the following steps that firstly, a microwave controller obtains the three-dimensional size of a sand core to be dried, and the total microwave power required by drying is calculated according to the maximum three-dimensional projection size of the sand core;
secondly, the microwave controller calculates the number of microwave magnetrons to be started, the position of each started microwave magnetron and the output power according to the total microwave power and the drying time;
thirdly, the microwave controller sends the output power of each magnetron to be started to a microwave power supply through an RS485 signal, and the microwave power supply outputs corresponding power to drive the magnetron to work;
fourthly, feeding back the parameters acquired in real time to the microwave controller by the temperature and humidity sensor;
and fifthly, after the microwave magnetron is started, performing pulse type drying according to the size of the sand core until the drying time is reached, and during the pulse type stop period of the microwave magnetron, starting an air circulation system of the drying equipment to perform uniform temperature circulation in the drying chamber.
The power adjusting method of the microwave drying equipment determines the total power required by drying and the number of the microwave magnetrons required to be started according to the maximum three-dimensional size of each concrete sand core to be dried, then determines the position and the power of each microwave magnetron required to be started according to the concrete size and shape of the sand core, further controls the power output power of each magnetron to specifically control the power of each microwave magnetron, realizes uniform distribution of microwaves in a drying chamber, has high drying efficiency, prevents overhigh local temperature, thereby realizing uniform and rapid drying of the sand core, and is suitable for drying of sand cores with different specifications by the automatic microwave power adjusting process.
In order to further achieve the purpose of the invention, in the first step, the microwave controller obtains the three-dimensional size of the sand core by one of the following methods:
s1.1: manually inputting the three-dimensional size of the sand core through an input end of a microwave controller;
or S1.2: the microwave controller automatically obtains the sand core number in an internal network through a network system;
or S1.3: a plurality of sensors are arranged at different positions in a drying chamber of the drying equipment to automatically detect the three-dimensional size of the sand core, and the corresponding size is transmitted to a microwave controller.
Further, in the first step, the total power of the microwaves is calculated by the following formula:
the total microwave power = (the volume of the sand core to be dried ×) sand core water content)/(microwave equipment dewatering capacity × drying time), wherein the sand core density and the sand core water content are known parameters, the microwave equipment dewatering capacity is 0.5-0.8kg/h.kw, and the drying time is determined to be 5-30min according to the process requirements.
In order to facilitate automatic adjustment of the output power of each microwave magnetron, in the second step, the working process of the microwave controller is as follows:
the number of magnetrons turned on is calculated as follows:
the number of magnetrons = total microwave function/rated power of the individual magnetron;
determining the positions of the started magnetrons according to the microwave magnetron distribution area covered by the sand core in the projection of the drying cavity;
according to the thickness of the sand core part opposite to each magnetron, determining the output power of the actual microwave power supply of the magnetron according to the following formula:
the output power of the microwave power supply = (actual thickness of the sand core/maximum thickness of the sand core) × power of a single magnetron, wherein the actual thickness of the sand core is the actual thickness of the part of the sand core opposite to the microwave magnetron, and the maximum thickness of the sand core refers to the maximum thickness of the sand core in the direction opposite to the magnetron.
In order to further ensure the drying quality, in the fifth step, when the drying time is reached, and the humidity fed back by the temperature and humidity sensor is higher than a set value, the drying time needs to be delayed according to the humidity higher condition.
Drawings
Fig. 1 is a control flowchart of a microwave controller according to the present invention.
Detailed Description
In the power adjusting method of the microwave drying equipment for sand cores with different specifications, the microwave controller controls the flow, a plurality of microwave magnetrons are uniformly distributed on the side wall in the drying chamber of the used microwave drying equipment, and the output power of each microwave magnetron is automatically adjusted through the microwave controller according to the flow shown in figure 1. The method specifically comprises the following steps:
the method comprises the following steps that firstly, a microwave controller obtains the three-dimensional size of a sand core to be dried, and the total microwave power required by drying is calculated according to the maximum three-dimensional projection size of the sand core; in this step, the microwave controller may obtain the three-dimensional size of the sand core by one of the following three ways:
the first approach: manually inputting the three-dimensional size of the sand core through an input end of a microwave controller; in the second approach, the microwave controller automatically obtains the core number in the internal network through a network system, and for enterprises with sound internal coding systems, corresponding sizes can be automatically obtained in the network through the approach;
the third approach: a plurality of sensors are arranged at different positions in a drying chamber of the drying equipment to automatically detect the three-dimensional size of the sand core, and the corresponding size is transmitted to a microwave controller.
Secondly, the microwave controller calculates the number of microwave magnetrons to be started, the position of each started microwave magnetron and the output power according to the total microwave power and the drying time; the output power of each microwave magnetron is convenient to be automatically adjusted; the specific working process of the microwave controller is as follows:
the number of magnetrons turned on is calculated as follows:
the number of magnetrons = total microwave function/rated power of the individual magnetron;
determining the positions of the started magnetrons according to the microwave magnetron distribution area covered by the sand core in the projection of the drying cavity;
according to the thickness of the sand core part opposite to each magnetron, determining the output power of the actual microwave power supply of the magnetron according to the following formula:
the output power of the microwave power supply = (actual thickness of the sand core/maximum thickness of the sand core) × power of a single magnetron, wherein the actual thickness of the sand core is the actual thickness of the part of the sand core opposite to the microwave magnetron, and the maximum thickness of the sand core refers to the maximum thickness of the sand core in the direction opposite to the magnetron.
And thirdly, the microwave controller sends the output power of each magnetron to be started to a microwave power supply through an RS485 signal, and the microwave power supply outputs corresponding power to drive the magnetron to work.
And fourthly, feeding back the parameters acquired in real time to the microwave controller by the temperature and humidity sensor so as to realize temperature and humidity closed-loop control of the microwave equipment.
And fifthly, after the microwave magnetron is started, pulse type drying is carried out according to the size of the sand core until the drying time is reached, and the time interval between the general microwave drying and the stopping is 4: 1, but not limited to the proportional gap, for example, the microwave is started for 4min and stopped for 1min, and during the pulse stop of the microwave magnetron, the air circulation system of the drying equipment is started to perform uniform temperature circulation in the drying chamber. When the drying time is up, when the humidity fed back by the temperature and humidity sensor is higher than a set value, the microwave controller needs to delay the proper drying time according to the condition that the humidity is higher than the set value, so that the dried sand core meets the requirements.
The power adjusting method of the microwave drying equipment determines the total power required by drying and the number of the microwave magnetrons required to be started according to the maximum three-dimensional size of each concrete sand core to be dried, then determines the position and the power of each microwave magnetron required to be started according to the concrete size and shape of the sand core, further controls the power output power of each magnetron to specifically control the power of each microwave magnetron, realizes uniform distribution of microwaves in a drying chamber, has high drying efficiency, prevents overhigh local temperature, thereby realizing uniform and rapid drying of the sand core, and is suitable for drying of sand cores with different specifications by the automatic microwave power adjusting process.
The present invention is not limited to the above embodiments, and those skilled in the art can make various alterations and modifications to the technical features of the invention without creative efforts based on the technical solutions disclosed in the present invention, and these alterations and modifications are all within the scope of the present invention.
Claims (4)
1. A power regulation method for microwave drying equipment for sand cores of different specifications is characterized in that a plurality of microwave magnetrons are uniformly distributed on the side wall of a drying chamber of the microwave drying equipment, and the output power of each microwave magnetron is regulated by a microwave controller according to the following method:
the method comprises the following steps that firstly, a microwave controller obtains the three-dimensional size of a sand core to be dried, and the total microwave power required by drying is calculated according to the maximum three-dimensional projection size of the sand core;
secondly, the microwave controller calculates the number of microwave magnetrons to be started, the position of each started microwave magnetron and the output power according to the total microwave power and the drying time; the number of magnetrons turned on is calculated as follows:
the number of magnetrons = total microwave function/rated power of the individual magnetron;
determining the positions of the started magnetrons according to the microwave magnetron distribution area covered by the sand core in the projection of the drying cavity;
according to the thickness of the sand core part opposite to each magnetron, determining the output power of the actual microwave power supply of the magnetron according to the following formula:
the output power of the microwave power supply = (actual thickness of the sand core/maximum thickness of the sand core) × power of a single magnetron, wherein the actual thickness of the sand core is the actual thickness of the sand core part opposite to the microwave magnetron, and the maximum thickness of the sand core refers to the maximum thickness of the sand core in the direction opposite to the magnetron;
thirdly, the microwave controller sends the output power of each magnetron to be started to a microwave power supply through an RS485 signal, and the microwave power supply outputs corresponding power to drive the magnetron to work;
fourthly, feeding back the parameters acquired in real time to the microwave controller by the temperature and humidity sensor;
and fifthly, after the microwave magnetron is started, performing pulse type drying according to the size of the sand core until the drying time is reached, and during the pulse type stop period of the microwave magnetron, starting an air circulation system of the drying equipment to perform uniform temperature circulation in the drying chamber.
2. The power regulating method of the microwave drying equipment for sand cores with different specifications as claimed in claim 1, wherein in the first step, the microwave controller obtains the three-dimensional size of the sand core by one of the following methods:
s1.1: manually inputting the three-dimensional size of the sand core through an input end of a microwave controller;
or S1.2: the microwave controller automatically obtains the sand core number in an internal network through a network system;
or S1.3: and a sensor arranged on a roller way in a drying chamber of the drying equipment automatically detects the three-dimensional size of the sand core and transmits the corresponding size to the microwave controller.
3. The method for adjusting the power of microwave drying equipment for sand cores with different specifications as claimed in claim 1, wherein in the first step, the total power of the microwaves is calculated according to the following formula:
the total microwave power = the volume of the sand core to be dried, the sand core density, the sand core water content)/(the microwave equipment dewatering capacity, the drying time), wherein the sand core density and the sand core water content are known parameters, the microwave equipment dewatering capacity is 0.5-0.8kg/h.kW, and the drying time is determined to be 5-30min according to the process requirements.
4. The power regulating method for microwave drying equipment for sand cores of different specifications as claimed in claim 1, wherein in the fifth step, when the drying time is up, and the humidity fed back by the temperature and humidity sensor is higher than the set value, the drying time is delayed according to the humidity higher condition.
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| CN109648755A (en) * | 2018-12-19 | 2019-04-19 | 北京华强诚信电器有限公司 | A kind of mutual inductor baking molding control system and method |
| CN111941702B (en) * | 2020-08-14 | 2022-11-25 | 沈阳理工大学 | Microwave curing device for composite material and curing method thereof |
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| SE457496B (en) * | 1987-05-07 | 1988-12-27 | Alfastar Ab | DEVICE TO REGULATE MAGNETIC RODS WHICH CONSIDER THEIR MICROWAVE EFFECT |
| JPH04332319A (en) * | 1991-05-08 | 1992-11-19 | Sharp Corp | Microwave oven |
| US5883801A (en) * | 1996-05-14 | 1999-03-16 | Microwave Science, Llc | Method and apparatus for managing electromagnetic radiation usage |
| ES2533575T3 (en) * | 2006-07-10 | 2015-04-13 | Goji Limited | Method and system for multifrequency microwave heating |
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Address after: 750000 the Ningxia Hui Autonomous Region Yinchuan economic and Technological Development Zone ningshuo South Street No. 298 Applicant after: KOCEL INTELLIGENT EQUIPMENT Co.,Ltd. Address before: 750000 the Ningxia Hui Autonomous Region Yinchuan economic and Technological Development Zone ningshuo South Street No. 298 Applicant before: NINGXIA KOCEL MOULD Co.,Ltd. |
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