JPS6039081Y2 - Grinding equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a crushing device, and specifically aims to improve the performance of the device and expand its range of application.

For example, in conventional methods, the pulverization process and the classification process are connected, so that pulverization and classification can be performed simultaneously and continuously, and the coarse particles selected in the classification process are transferred to the pulverization process again. There is a crushing device shown in Japanese Patent No. 816767 (Japanese Patent Publication No. 50-21695).

The above-mentioned crushing equipment is capable of extremely efficient crushing and classification in an ideal connection state of the crushing process and the classification process, has excellent processing capacity, and can obtain products with uniform particle size, as well as reduce the temperature rise in the crushing section. It has many advantages, such as being able to crush resins, foods, medicines, and other mildly heat-sensitive substances.

Moreover, in this device, pulverization and classification are repeatedly performed, and only particles that have been pulverized to a desired particle size or less are discharged.
Particles larger than this are sent to the pulverization step again.

By the way, in the crushing process of the device, the atomic particles crushed by the impact force applied by the crushing rotor are strongly collided with the inner wall surface of the casing, but at this time, depending on the raw material, a fixed layer may be formed on the wall surface. And it was meant to grow.

In addition, once this fixed layer of powder and granules takes hold and grows, it blocks the rotation of the grinding rotor, making grinding itself impossible, or even if it is not impossible to grind, it extremely reduces the grinding ability. Met.

In addition, these fixed and grown powders fall off irregularly and instantaneously, and if the next process includes a classification process, the classification process itself may be interrupted due to a rapid increase in the powder concentration in the classification chamber. This was a major cause of instability and reduced classification accuracy.

As described above, the adhesion of powder and granules inside the crusher not only deteriorates both the crushing and classification performance, but also poses a serious problem regarding the operation of the apparatus itself.

On the other hand, methods have been used to prevent powder from adhering to the inner wall surface by pasting a material on the inner wall surface to which powder does not adhere or coating the inner wall surface with a homogeneous material.

For example, it has already been implemented to prevent adhesion and shelf hanging by pasting a material such as rubber or resin as a lining on the inner wall surface of a storage tank silo or hopper.

Further, there is Japanese Utility Model Application No. 51-63277 as an example in which the same kind of material is similarly applied to a crusher as a lining.

This device uses a hard elastic material such as rubber or sponge attached to the inner surface of a casing as an earth crushing device, and uses rotating blades installed inside the casing to collide the lumps with the surface of the elastic material to crush the soil. Even in the event of a block-like collision, the elastic material will not stick to the inner wall surface of the casing because it is attached to the inner wall surface of the casing.

However, when the present invention is to be applied, it is not always sufficient to simply attach an elastic material to the inner wall surface of the casing as a lining material.

In other words, in the above device, the inner wall surface is only configured as a collision surface for crushing, and after colliding with the inner wall surface, the crushed soil is given a turning force necessary for classification in the next process, etc., and is made to rotate. is not necessary at all, and it is sufficient if the crushed soil is repelled by the elastic force of the elastic material itself after colliding with the inner wall surface, or is peeled off and prevented from adhering to the inner wall surface.

On the other hand, a general pulverizer for powder and granules has a grinding blade that rotates at high speed in the grinding chamber, and the powder and granules are rotated at high speed within the grinding chamber, and the powder and granule particles themselves are also finely pulverized. Furthermore, the particles are thrown off at high speed in the outer circumferential direction by the impact force and centrifugal force applied by the crushing blades, and are strongly pressed against the inner wall surface.

In this way, unlike the former, which performs a sufficient function by simply preventing sticking during collision and crushing, the crushing blades and swirling airflow work together to create a strong pressing force against the inner wall surface. In the latter case, in which powder particles are strongly adhered to the inner wall surface, it is extremely difficult to completely prevent such adhesion.

In view of these points, the present invention has been developed by using a material that can alleviate the collision of powder particles against the inner wall surface to which powder particles tend to stick, i.e., rubber or resin, or a similar material with appropriate elasticity. The purpose of this invention is to attach a liner made of an elastic material having the following properties to prevent the powder from sticking to and growing on the inner wall surface.

Next, the structure of the present invention will be explained with reference to the embodiment shown in FIG.
The outer peripheral space formed by these is a crushing chamber 5, and the other is a classifying chamber 6, and the crushing chamber 5 and the classifying chamber 6 are equipped with a crushing rotor 12 radially equipped with a plurality of crushing impactors 13 and classifying blades 15, Classifying rotors 14 are arranged respectively, and the crushing rotor 12 and the classifying rotor 14 are coaxially fitted and fixed to separate rotating shafts 3 and 4, respectively, and are rotated.

Here, regarding the arrangement of the guide member 16, a sufficient gap is provided between both ends of the guide member 16 and the inner wall surface 11 to allow airflow to flow, and a circulation path is provided that communicates the crushing chamber 5 and the classification chamber 6 with each other. 7, and in accordance with this, the inner wall surface 11 corresponding to the circulation path 7 is formed into a smooth curved surface to smooth the flow of air.

Reference numeral 9 is a fine powder discharge port that communicates with the inside of the classification rotor 14, and is connected to a collector and a windmill (not shown).

Reference numeral 8 denotes a supply port, which is arranged facing the grinding chamber 5;
A feeder 2 is connected to the .

Although the feeder 2 is a set of screws in this embodiment, other devices may be used in the present invention as long as they can maintain airtightness.

Reference numeral 10 denotes a gas introduction port for introducing gas into the aircraft, and the gas introduction port 10 is connected to an inflow path 17 and an inflow port 19.
It communicates with the inside of the crushing chamber 5 via.

Here, the inflow passage 17 is configured to allow the gas to flow along the inner wall surface 11 as much as possible when flowing into the grinding chamber 5 from the inlet port 19, and is formed by the inner wall surface 11 and the grinding rotor 12. It is configured with a gap t formed.

Therefore, regarding the configuration of the inflow path 17, the gap t
It is necessary to give sufficient consideration not only to the set value of , but also to the surface form of both the inner wall surface 11 and the crushing rotor 12 so that the shape has a smooth curved surface with little pressure loss.

As a result, the inflow path 17 and the inner wall surface 11 are normally connected by a smooth continuous surface.

Next, a liner 18 having a width sufficient to accommodate the crushing rotor 12 is stretched over the inner wall surface 11 at least near the outer periphery of the crushing rotor 12 .

The liner 18 is made of rubber or resin with appropriate elasticity.
Alternatively, it is formed of an elastic material similar to these materials, and is used to cushion the impact when the powder or granular material collides with the inner wall surface 11.

In addition, most of the crushing effect in the crushing device is obtained only by the crushing impactor 13, and the crushing effect is obtained only by the crushing impactor 13.
Unlike a type of crushing device in which powder particles are crushed by collision with the inner wall surface 11, the rate at which powder particles are crushed by collision with the inner wall surface 11 is extremely low.
Even if a liner 18 made of an elastic material such as rubber or resin is provided over the pulverizer, the pulverizing performance of the pulverizer itself will not be reduced.

In this way, the gist of the present invention is that the crushing rotor 12
A liner 18 made of rubber, resin, or a similar elastic material is disposed on the inner wall surface 11 near the outer periphery of the crushing chamber 12 at a position where the incoming airflow from the inflow passage 17 communicating with the crushing chamber 12 reaches. In addition, for example, the shapes of the constituent members shown in this embodiment are not particularly limited, and may be changed in design depending on various conditions.

Incidentally, if I were to specify a condition, it is desirable that the elastic material has sufficient abrasion resistance and durability even with respect to powder and granules.

In the above configuration, after setting the crushing rotor 12 and the classification rotor 14 to arbitrary rotational speeds, the windmill (not shown) is operated, gas is sucked through the gas inlet 10, and a swirling airflow r is generated in the main body 1. After the formation, a gas flow is formed that passes between the classification blades 15 and exits to the fine powder outlet 9.

The airflows generated inside the machine at this time include swirling airflows r generated in the grinding chamber 5 and classification chamber 6 by the rotation of the grinding rotor 12 and classification rotor 14, and a part of these swirling airflows r flowing into the fine powder outlet 9. A circulating airflow C that flows between the grinding chamber 5 and the classification chamber 6 along the moving exhaust airflow e and the guide member 16, and an inflow airflow i that flows into the grinding chamber 5 from the gas inlet 10 via the inflow path 17. There is.

These particles flow through the grinding chamber 5 while repeatedly merging and separating from each other.

In this state, the raw material introduced into the crushing chamber 5 from the supply port 8 is immediately subjected to impact crushing by the crushing impactor 13.

Then, while rotating around the inner wall surface 11 by the swirling airflow r, it is transferred into the classification chamber 6 by the inflowing airflow i.

Here, the raw material particles are separated into coarse particles and fine particles by the difference in acting force between the centrifugal force by the classification rotor 14 and the centripetal force by the discharged airflow e, and the fine particles for which the centripetal force is greater than the centrifugal force are combined with the discharged airflow e. It passes between the classification blades 15 and is discharged from the fine powder outlet 9, and the gas and powder are collected by the collector.
be captured.

On the other hand, coarse particles for which the centrifugal force is greater descend while swirling and are sent into the grinding chamber 5 to be ground again.

The reason why the air flows from the grinding chamber 5 to the classification chamber 6 and from the classification chamber 6 to the grinding chamber 5 is due to the flow circulating along the guide member 16, that is, the formation of the circulating air flow C. As a result, the raw material is repeatedly subjected to both the actions of pulverization and classification, and can be efficiently pulverized and classified.

By the way, raw material particles subjected to centrifugal force due to crushing by the crushing rotor 14 collide with the inner wall surface 11, but due to the tensioning of the liner 18 on the inner wall surface 11, they do not stick at all, and the inflow air flow i and the circulating air flow C into the classification chamber 6.

In other words, the liner 18 is made of rubber, resin, or a similar elastic material with appropriate elasticity, and it cushions the impact when raw material particles collide, and also absorbs both the repulsion and vibration caused by elastic displacement. This action suppresses the adhesion of raw material particles and releases the stuck particles.

Furthermore, the inflow passage 17 is connected to the inner wall surface 1 so that the inflow airflow i acts on the liner 18 to separate the adhered particles.
1, and the fixed particles are transferred to the classification chamber 6 at the same time as they are released from the liner 18, so it is effective not only for materials that easily adhere and stick but also for materials that are easily affected by heat. It is something to do.

As described above, according to the present invention, it is possible to prevent the powder and granular material from adhering to and sticking to the inner wall surface 11, to stabilize the amount of accumulation inside the machine, and to continuously prevent the increase in pressure loss and load power. The ability to promote smooth operation of the crushing equipment and improve processing capacity.

In addition, the ability to reduce the extra residence time inside the machine greatly improves the range of application of the device, such as making it applicable to powder and granular materials that are sensitive to temperature and prone to deterioration and reaction. The effect on ideas is significant.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention, and FIG. 2 is an enlarged view of section A in FIG. In the figure, 1...Casing, 5...
・Crushing chamber, 6...Classification chamber, 7...Circulation path, 11...Inner wall surface, 12...Crushing rotor, 14...・Classifying rotor, 16...
Guide member, 17... Inflow path, 18...
It's Raina.

Claims (1)

[Scope of utility model registration request] A crushing impactor 1 is housed in a casing 1 equipped with a raw material supply port 8 on the side, a fine powder discharge port 9 on the top, and a gas introduction port 10 on the bottom.
3, and a classification rotor 14 located above the grinding rotor 12 and connected to the fine powder discharge port 9.
The outer crushing chamber 5 and the inner classifying chamber 6 are separated by an annular guide member 16 surrounding the classification rotor 14 with a slight gap left between the crushing rotor 12 and the wall surface.
In a grinding apparatus, a grinding rotor 12 is divided into two parts, and a circulation path 7 is formed in which a part of the air flow rising along the wall surface of the grinding chamber 5 and flowing into the classification chamber 6 flows out to the grinding chamber 5 side.
A crushing device characterized in that a liner 18 made of rubber, resin, or a similar elastic material having appropriate elasticity is attached to the inner wall surface 11 of the casing 1 near the outer periphery.