CN201233165Y - Vertical positive-pressure/negative-pressure microwave energy cereal drying and disinsection machine - Google Patents

Abstract

The utility model relates to a vertical positive pressure/negative pressure microwave energy grain drying insecticide. It solves the problem of lack of efficient, fast, convenient and energy-saving grain drying and insecticidal equipment in the grain storage industry. The machine consists of a barn, a microwave cavity, a post-processing cavity, and a discharge bin, which are connected sequentially from top to bottom; the outlet of the barn is connected to the inlet of the microwave cavity; the cross-section of the microwave cavity is rectangular, and the bottom surface of the microwave cavity is arranged There are air holes, and the middle part of the bottom surface is provided with a discharge port. A plurality of microwave feeding ports are evenly distributed on the opposite side walls of the microwave cavity. The microwave feeding ports are connected to an external microwave source through a microwave transmission line. Air extraction port; one side of the rear processing chamber is provided with an air inlet pipe, and the middle of the bottom surface of the rear processing chamber is provided with a gate of the rear processing chamber. The utility model uses microwave energy technology to realize fast and efficient drying of grains; the utility model has compact structure, small volume, low operating temperature, low operating cost and high efficiency, and can effectively kill grain pests while drying grains.

Description

Vertical positive pressure \ negative pressure microwave energy grain drying insecticide machine

technical field

The utility model relates to a grain drying insecticide, in particular to a microwave energy grain drying insecticide.

Background technique

In order to ensure the quality of grain storage, there is a strict upper limit requirement on the moisture content of the grains ready for storage. If the moisture content of the grain exceeds this limit, the grain will not be allowed into the warehouse. When the pests in the grain reach a certain density, the stored grain will face a great risk of qualitative change and mildew, which will have a great impact on the quality of grain storage. How to kill grain pests is also an important problem faced by the grain storage industry.

The currently used grain drying method is generally to dry the grain with dry hot air (temperature above 120° C.), or to dry the grain with high-temperature air plus infrared radiation, except for sun exposure. All kinds of grain dryers currently on the market generally fall into this category. The disadvantage of this method is that it consumes a lot of energy, and at the same time, this type of drying equipment needs to process the grain with high-temperature hot air above 120 ° C. This high temperature will have a considerable negative impact on the activity of the grain. As for the problem of insecticide for grain, except that large-scale warehouses adopt the method of fumigation with drugs in the warehouse (this method pollutes the air to a certain extent), small-scale grain warehouses and farmers do not take any insecticide measures at all. This situation needs to be changed urgently.

Contents of the invention

In order to solve the urgent need of an efficient, fast, convenient and energy-saving grain drying and grain insecticide equipment in the grain storage industry, the utility model provides a vertical positive pressure/negative pressure microwave energy grain drying and insecticide machine.

The design scheme of the present utility model is as follows:

The vertical positive pressure/negative pressure microwave energy grain drying insecticide uses microwaves to have a strong heating effect on grain materials, and can quickly dehydrate grains and efficiently kill insects at a lower processing temperature. The whole equipment includes the barn, microwave chamber, post-processing chamber and discharge bin connected sequentially from top to bottom, as well as external microwave source system, fan, negative pressure aspirator, operation console and other parts;

The barn is funnel-shaped, and the outlet of the barn is connected to the inlet of the microwave cavity;

The microwave cavity is made of welded metal plates, and the entrance is equipped with an inlet gate. The cross section of the microwave cavity is rectangular, and the bottom surface of the microwave cavity is uniformly equipped with air holes. The gate and the opposite side walls of the microwave cavity are respectively equipped with microwave feed ports, and the microwave feed ports are connected to an external microwave source through a microwave transmission line, and the other two walls of the microwave cavity are respectively provided with air extraction ports;

One side of the post-processing chamber is provided with an air inlet pipe, the bottom of the post-processing chamber is bucket-shaped, and the middle part of the bottom is provided with a post-processing chamber gate.

Eight microwave feeding ports are evenly distributed on opposite side walls of the microwave cavity.

The feeder is a standard rectangular single-mode interface or a multi-mode interface.

In the device, a grain processing cavity and a microwave resonant cavity for drying and killing insects are combined into one. The movement of the processed grain in the machine is completely dependent on the gravity of the grain itself, without any external power.

Microwaves can be effectively absorbed by grains, and the grains are evenly heated inside and outside. During microwave heating, water and objects with high water content (such as various grain insects) absorb microwaves particularly intensely. Their temperature will be significantly higher than the macroscopic background temperature of the grain. This is the reason why microwave treatment of grains will produce a strong dehydration effect and insecticidal effect at normal temperature.

Compared with the existing various types of grain dryers, the utility model has the following advantages:

1. This equipment can not only quickly dry grains and reduce the moisture content of grains, but also kill grain pests quite thoroughly, achieving the effect of one machine with two uses.

2. The operating temperature of this equipment is low (the effective drying temperature is 35-45°C under negative pressure operating state, 40-50°C effective drying temperature under positive pressure operating state, and 55-70°C effective insecticidal temperature). The activity of the grain will not be harmed in any way by the temperature. (The operating temperature of the traditional dryer needs to be higher than 120°C, which will damage the activity of the grain.)

3. Short processing time, only 10-20 minutes for one processing process. It is an efficient and energy-saving device. (The processing time of traditional dryer is dozens of hours)

4. The utility model is small in size, light in weight, easy to move and easy to install, and is suitable for all kinds of grain warehouses and large and medium-sized farmers. (Traditional grain dryers are particularly bulky)

5. The equipment has good operability, controllability and high degree of automation. It is an environment-friendly equipment that uses ordinary commercial power as power. (A considerable part of traditional dryers use coal or fuel oil, which has high energy consumption, low thermal efficiency, and air pollution.)

6. The operation cost of the equipment is low, and the cost of reducing the moisture content of one kilogram of grain by 1 percentage point does not exceed 1.5 cents (the electricity fee is calculated at 0.8 yuan/kWh).

7. The cost of this equipment is moderate: the cost of equipment with a daily processing capacity of 10-20 tons is about 100,000-140,000 yuan. The cost is about the same as that of traditional dryers with the same processing capacity.

8. In addition to processing various grains (rice, wheat, corn, etc.), the equipment can also process various oil seeds (soybeans, rapeseeds, sunflower seeds, etc.), and various dried fruits that need to be dried; the equipment structure is slightly modified It can also handle all kinds of light items (tea, tobacco, medicinal materials, etc.) that need to be dried or dehydrated.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described by embodiment.

Example:

The vertical positive pressure/negative pressure microwave energy grain drying insecticide includes a barn 10, a microwave cavity 1, a post-processing cavity 6 and a discharge bin 11 connected in sequence from top to bottom;

The barn 10 is funnel-shaped, and the outlet of the barn 10 is connected to the inlet of the microwave cavity 1;

An inlet gate 7 is installed at the entrance of the microwave cavity 1, the cross section of the microwave cavity 1 is rectangular, the bottom surface of the microwave cavity 1 is uniformly provided with air holes, the middle part of the bottom surface has a discharge port, and a discharge gate 8 is installed at the discharge port. The opposite side walls of the microwave cavity 1 are respectively equipped with 8 microwave feed ports 2, and each microwave feed port is connected to the microwave emission port corresponding to the external microwave source through a microwave transmission line. The microwave feed port 2 is a standard rectangular single-mode interface or Multi-mode interface, the other side walls of the microwave cavity 1 are respectively provided with a left air outlet 4 and a right air outlet 5;

An air inlet duct 3 is installed on one side of the rear processing chamber 6, the bottom surface of the rear processing chamber 6 is bucket-shaped, and a rear processing chamber gate 9 is arranged in the middle of the bottom surface.

The processor also includes parts such as temperature measurement system and operation control system.

The grain is placed in the barn 10 in advance, and the grain can enter the microwave cavity 1 through the inlet gate 7 . The microwave cavity 1 is actually a cavity for the interaction between the microwave and the grain. The grain is heated substantially uniformly by the microwave in the microwave cavity, and the moisture contained in the grain is volatilized concentratedly. In the case of good ventilation or negative air pressure in the cavity, the free moisture is quickly blown or sucked out, and the moisture content of the grain is reduced to achieve the purpose of drying the grain. At the same time, when the macroscopic temperature of the grain reaches above 55°C, the grain pests will be completely killed due to a large amount of microwave absorption. To achieve the purpose of killing grain pests.

Microwave source and microwave feed-in: use a split microwave source with a frequency of 2450MHz and a total power of 12-22KW with multiple magnetrons (a total of 16, with a single tube output power up to 800W or 1500W). The power supply part of the microwave source is composed of two power supply cabinets, each cabinet can provide power for 8 magnetrons. The 16 channels of microwaves are planned to be fed into the cavity through the microwave feeding port opened on the side wall of the microwave processing cavity, evenly distributed and staggered on the E surface/H surface. The microwave feed port 2 adopts a standard rectangular single-mode interface or a multi-mode interface, through which microwaves are fed into the active cavity. A dielectric sealing plate is arranged in the microwave feeding port to isolate the grain from the microwave system. This arrangement makes the grain processing bin a multi-mode microwave resonant cavity, which is conducive to the uniform heating of the grain by microwaves.

The ventilation system of this device: adopt the waist-shaped hole metal plate and the metal pipe that are used for large-scale granary to make air inlet duct 3 and ventilation partition. Experiments have proved that the microwave isolation of this perforated metal plate is also very good. Use the negative pressure suction method to form a negative pressure in the grain bin, or use a strong blower to blow air to form a positive pressure in the cavity. These two operating modes can be selected arbitrarily by the operator.

Measuring the temperature of the grain: Open some 3mm small holes on the wall of the microwave cavity for the use of the temperature sensor. The operator can adjust the microwave operating parameters according to the temperature of the grain.

Subsequent processing of grains: After microwave action, grains still have a relatively high temperature after leaving the microwave action cavity. In order to make full use of the effect of the temperature, a post-treatment chamber 6 for grains is arranged under the microwave cavity, and the grains continue to receive air-cooling or negative pressure treatment in the post-processing chamber 6 . After post-processing, the temperature of the grain drops, and the moisture content will be further reduced.

Grain loading and unloading: the grain in the barn 10 is introduced into the microwave chamber 1 or the grain is released from the post-processing chamber 6 to the Out of the bin 11. The movement of the grain in the machine is completely dependent on the gravity of the grain itself, without any external power.

Claims (3)

1. Vertical positive pressure/negative pressure microwave energy grain drying insecticide machine, which is characterized in that it includes a barn, a microwave cavity, a post-processing cavity and a discharge bin connected in sequence from top to bottom; The barn is funnel-shaped, and the outlet of the barn is connected to the inlet of the microwave cavity; There is an inlet gate at the entrance of the microwave cavity. The cross section of the microwave cavity is rectangular. The bottom surface of the microwave cavity is uniformly equipped with air holes. The microwave feed ports are evenly distributed respectively, and the microwave feed ports are connected to the external microwave source through the microwave transmission line, and the other side walls of the microwave cavity are respectively provided with air extraction ports; One side of the post-processing chamber is provided with an air inlet pipe, the bottom of the post-processing chamber is bucket-shaped, and the middle part of the bottom is provided with a post-processing chamber gate. 2. The vertical positive pressure/negative pressure microwave energy grain drying and insecticide machine according to claim 1, characterized in that 8 microwave feeding ports are evenly distributed on the opposite side walls of the microwave cavity. 3. The vertical positive pressure/negative pressure microwave energy grain drying and insecticide machine according to claim 1, characterized in that: the feed port is a standard rectangular single-mode interface or multi-mode interface.

Images