JPS58214355A - Electromagnetic type crushing processing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic pulverization apparatus suitable for pulverizing grains having a small bulk density, such as rice husks.

Large amounts of rice husks are generated at rice centers, etc.

In recent years, attention has been focused on ways to utilize it, such as pulverizing it to about 74 μm and using it as a filler for resin materials, or as a humidity control material for compost, and some have specialized machines for this purpose. has also been put into practical use.

The conventional machine used for this rice husk crushing process is a mechanical impact crusher as shown in FIG.
Frozen rice husks are sent in from a pulverizing material inlet 3 and are finely pulverized by a runner 2 in the case song, and taken out as pulverized material through an outlet 4 and collected. However, rice husks have a hard surface and are made of fibers, making them very flexible and difficult to crush.In the crusher shown in Figure 1, the crushing blades wear out quickly. The problem is that it is not possible to stably obtain a crushed product with a fine particle size over a long period of time. For this purpose, moisture is added to the rice hulls in the first stage of processing, which is called swelling and softening processing.

Another method is to feed the powder into a pulverizer in a heated and compressed state, but although this method improves pulverization performance, it requires a drying operation to remove moisture after pulverization, making the process complicated. For this reason, there is a desire for a rice husk crusher with good crushing performance and efficiency to replace the mechanical crusher mentioned above.

On the other hand, recently, a new electromagnetic crusher has been developed that uses a moving magnetic field to apply electromagnetic force to a working piece to process crushed materials. Next, the structure and principle of this crusher will be described with reference to FIGS. 2 and 3. In the figure, reference numeral 5 denotes a processing container that houses a large number of working pieces 7 made of ferromagnetic or non-magnetic conductive material along with crushed material 6 as the object to be processed. The moving magnetic field generators 8 and 9, which are well known as so-called linear motors, are arranged opposite each other, and the moving magnetic field φ8
．． φ, are defined in opposite directions.

With this configuration, υ, moving magnetic field φ1. The working piece 7 placed in the magnetic field affected by φ is magnetized.

Eddy currents are generated and electromagnetic forces act due to interaction with the moving magnetic field. As a result, the working piece 7 is subjected to a translational force in the direction of the moving magnetic field, a rotating magnetic torque around the floating blade, and the center of gravity, and furthermore, collisions between the working pieces and collisions between the working pieces and the container wall are added, and the container 5, causing complex and intense random motion. This random movement causes the crushed material 6 to be crushed by impact and friction.

This electromagnetic pulverizer differs from the conventional mechanical pulverizer shown in Figure 1 in that it pulverizes by random movement of the working pieces, which eliminates problems such as wear of the pulverizing blades and provides stable pulverization over a long period of time. Performance can be obtained and the pulverization processing time can be shortened. According to experiments conducted by the inventor, when rice husks were crushed using this electromagnetic crusher, the first
Compared to the crusher shown in the figure, the crushing time is shorter.

It has also been confirmed that fine pulverization is also possible.

However, even when pulverizing rice hulls using an electromagnetic pulverizer with good pulverizing performance, the batch method in which the pulverized material 6 is continuously pulverized from coarse to fine pulverization in the same chamber is not suitable for operation. There is an S point in terms of efficiency and other aspects.

The bulk density of the rice husks is extremely small at 0.12 t/-, and if the rice husks are stored together with the working piece 7 in the processing container 5 at an appropriate filling rate at the beginning of the operation, it will take only a short time. Since the bulk of the coarsely crushed rice husks is reduced to 1/2 to 1/4 of the initial filling amount, the subsequent operation up to fine pulverization requires only 6 crushed grains compared to the volume of the processing container 5.
This means that they will be forced to operate at a low filling rate. Moreover, during this period, it is necessary to supply power to the electromagnetic crusher in order to drive the working pieces, which results in lower utilization efficiency in terms of the crusher's processing capacity and operating efficiency in terms of power consumption. Become. Furthermore, if the crushed material is continuously crushed in the same room until it reaches the desired fine particle size, a portion of the crushed material will be over-pulverized, and the resulting ultra-fine powder will act as an obstacle to the continuation of the crushing. The subsequent grinding efficiency is rapidly reduced, leading to increased loss of grinding energy.

This invention has been made in consideration of the above points, and its purpose is to solve the problems encountered during the pulverization process using the electromagnetic pulverizer, and to provide an electromagnetic pulverization device that improves operating efficiency and pulverization efficiency. It is about providing.

This purpose is achieved by the present invention, which provides a multi-stage coarse pulverizer having an inlet and an outlet, respectively, in a processing container placed in a magnetic field between a pair of moving magnetic field generators arranged oppositely with the directions of the moving magnetic fields set to be mutually directed. Separate the grinding chamber for grinding and fine grinding.
And if the grinding chambers of each stage are connected in the order from the coarse grinding chamber to the fine grinding chamber and connected with an air flow conveying type powder conveying duct, the result is 4.
In addition, a screen is installed on the entrance side of each stage of the grinding chamber to prevent the working pieces stored in each chamber from flying out.
The exit side is equipped with a classification sieve that corresponds to the crushing chamber.
This is achieved by constructing a structure in which the crushed material is continuously fed through the conveying duct by means of a conveying air stream, and a crushed product is obtained through coarse crushing and fine crushing steps.

The present invention will be explained below based on illustrated embodiments.

In FIGS. 4 and 5, a processing container 5 placed between a pair of moving magnetic field generators 8 and 9 facing each other on the left and right and placed in the magnetic field is provided with an internal partition plate. Move to the upper stage and move to the coarse grinding chamber 51. Medium crushing chamber 5■, differential crushing chamber 5III
A plurality of stages of crushing chambers are partitioned in this order. In addition, the grinding chambers 51 to 5nI of each stage have their front and back surfaces opened to form the inlet and outlet of the crushed material, and the spaces between these chambers are connected from the coarse grinding chamber 5 of the first stage to the medium and fine grinding chambers 5n. , 5111, an airflow conveying type crushed material conveying duct 12 is piped between the crushed material input hopper 0 and the crushed material recovery container 11.

As shown in the figure, this conveyance duct 12 has an entrance duct for 12 people,
Outlet duct 12B, and relay ducts 12C, 12D
It is made up of. In this case, the directions of the inlets and outlets of the crushing chambers 51 to 5■ are alternately set in opposite directions from the first stage chamber 5■, and between the adjacent crushing chambers, the outlet of the front stage chamber and the outlet of the rear stage chamber are set in opposite directions. (U-shaped relay duct between the entrance and the entrance) 12C
, 12D. Returning to the processing container 5, the working pieces 71, 7TJ accommodated in each chamber are placed at the entrance of each stage of the crushing chambers 51, 511, 5I [1].
.

There is a screen 13 that prevents 7m from flying out, and a classification sieve 141.1 with a different mesh size for each chamber 51, 5, 5111 for coarse, medium, and fine pulverization at the blade outlet.
411.14m each. This sieve has the coarsest mesh of the first sieve 141, and the mesh becomes finer in the order of 141.14111. Furthermore, each stage of grinding chamber is 51.5m long.

The volume of the interior space of the 5 rivers is also based on the 2nd tier, based on the 1st tier.

The cross-sectional area is gradually narrowed so that it becomes smaller in the order of the third stage. In addition, the relay duct 12C112D has an opening/closing door 151.15 on its end surface for taking out intermediate crushed products.
is the provision. Note that 16 is placed side by side with hopper 10)
12A entrance side and each relay duct) 12C, 12D
By operating these fans, the crushed material is transported through the crushing chambers 5 to 5 of each stage to the transport duct 12 as indicated by the dotted line arrows. An air current is generated.

Next, the crushed material and the crushing operation in the crushing apparatus having the above configuration will be described. First, each stage of crushing chamber 51.511.
5111 has coarse grinding and medium grinding, respectively.

Working piece 71.7 with dimensions and shape suitable for fine grinding
11,7111 are accommodated. Next, when the moving magnetic field generator 8.9 and each fan 6 are in operation, if crushed material 6 such as rice husks is put into the hopper 10, the unpulverized crushed material 6 will be transported to the first stage by the conveying airflow. It is fed into the coarse grinding chamber 5I, where it is coarsely ground by random movement of the working piece 7I. The coarse powder coarsely ground to a predetermined particle size in the chamber 5I is passed through the classification sieve 14I by the conveying air current, and then sent to the second stage medium grinding chamber 5■ via the relay duct) 12C, where it is It is further finely ground. Next, the crushed material that has passed through the classification sieve 1411 is introduced into the final stage pulverization chamber 5■, where it is pulverized. Finally, the fine powder that has passed through the finest mesh classification sieve 1411 is discharged into the recovery container 11 as a crushed product 17. Note that the above-mentioned crushing operation is performed continuously during operation. Furthermore, if necessary, by opening the opening/closing J% 151 or 1511 during operation, it is possible to extract crushed products with a particle size smaller than the particle size that has been pulverized to the coarse or medium pulverization stage through this door opening. . Although the illustrated example shows an example in which the processing container 5 is divided into three chambers, it can also be divided into two or four or more stages.

According to the above-mentioned apparatus, first, in the process of crushing, as the crushing progresses, the bulk density of the crushed material 6Fi, such as rice husks, with a small bulk density increases, that is, the apparent volume decreases, but as mentioned earlier, Grinding chambers 51, 511, 5]1 in each stage
By predetermining the volume of f so that it decreases in this order, the crushing chambers of each stage are always filled with an appropriate amount of crushed material, with almost no excess or deficiency, in accordance with the apparent volume reduction of the crushed material. Therefore, all the indoor spaces of the processing container 5 are effectively used, thereby improving operational efficiency. Furthermore, the crushed material crushed to a predetermined particle size in each stage of the crushing chamber does not remain in the same chamber at all times, but quickly passes through the classification sieve and is discharged to the subsequent crushing chamber.
The degree of over-grinding is small, so there is no hindrance to the continuation of the crushing operation, and high crushing efficiency can be maintained, and the wastage of crushing energy due to over-grinding is also prevented. Become. In addition, as shown in the illustrated example, by providing opening/closing doors 15i, 1511 in the middle of the crushed material conveying duct at an intermediate position between the front-stage crushing chamber and the rear-stage crushing chamber,
If necessary, crushed products of various diameters of rice can be extracted and taken out.

As described above, according to the present invention, it is possible to provide an electromagnetic pulverization device that can perform continuous pulverization of granules while achieving high operating efficiency and high pulverization efficiency, and has excellent granulation processing capacity and pulverization performance. I can do it.

[Brief explanation of drawings]

Figure 1 is a sectional view of the configuration of a conventional mechanical crusher, Figure 2 is a diagram of the configuration principle of an electromagnetic crusher, and Figure 3 is a view taken in the direction of arrow III in Figure 2.
-III sectional view, FIG. 4 is a schematic configuration diagram of an embodiment of the present invention, and FIG. 5... Processing container, 51~5■... Grinding chamber, 6...
Grinding material, 7.71~'7111...working piece,
8.9... Moving magnetic field generator, 12... Granule transport duct), 13... Screen, 141-1411I...
・Classifying sieve. 151.1511...Opening/closing door, 16...Blower fan, 17...Crushed product. Sai 1 Mouth Sai 2 Bold -73t8 Sai S Mouth

Claims (1)

[Claims] 1) Particles are fed into a processing container containing a large number of working pieces made of magnetic or non-magnetic conductive materials, and a moving magnetic field is applied to the processing container from the outside. In an electromagnetic pulverization device that uses electromagnetic force based on the interaction with a moving magnetic field to generate random motion in a working piece to pulverize crushed materials, two pieces are placed facing each other with the directions of the moving magnetic fields set in opposite directions. A processing container placed in a magnetic field between a pair of moving magnetic field generators is partitioned into multiple stages of grinding chambers for coarse grinding and fine grinding, each having an inlet and an outlet. are connected in series from the coarse grinding chamber to the fine grinding chamber, and are connected to an air flow conveyance type powder conveying duct, and the working pieces stored in each chamber are ejected from the entrance side of each stage of the crushing chamber. Preventing screen f: The exit side is equipped with a classification sieve corresponding to the crushing chamber, and the crushed material is continuously fed through the conveying duct by air flow conveyance, and the crushed material is processed through coarse crushing and fine crushing processes. An electromagnetic crushing device characterized by: 2. The pulverization processing apparatus according to claim 1, characterized in that the pulverization chambers in each stage are defined so that their volumes gradually decrease from the coarse pulverization chamber in the first stage. Type crushing equipment. 3) In the pulverization processing apparatus according to claim 1 or 2, an inlet of each pulverization chamber defined in the processing container;
An electromagnetic crushing process characterized in that the exit directions are alternately set in opposite directions, and the exits of the front chamber and the entrance of the rear chamber which are adjacent to each other are connected to each other by a U-shaped relay duct. Device. 4) An electromagnetic crushing device according to claim 3, characterized in that the relay duct is provided with an opening/closing door for taking out intermediate crushed products.