JPH023791Y2 - - Google Patents

Description

[Detailed description of the invention] This invention crushes the granular material supplied to a rotating round table using rollers or balls, carries out the fine powder out of the system using hot air, and actively removes relatively coarse particles from the round table. In a closed-type crusher, the raw material granules are allowed to overflow into the crusher and then fed back onto a round table using an appropriate transporter, which prevents the introduction of air into the crusher due to leakage without using a special air seal mechanism. Related to material supply device.

Conventionally, in this type of equipment, the connection between the raw material granule supply conveyor and the supply chute is open to the atmosphere, but due to the negative pressure in the grinding chamber, a large amount of material flows from this connection through the supply chute. Air leaks into the grinding chamber, forcing an increase in the power consumption of the exhaust fan that carries out the ground fine powder. To prevent this, an air sealing mechanism such as a rotary valve or multistage flap damper is installed in the supply chute. . In this case, the agglomerates are intermittently fed onto the round table, and the layer thickness of the agglomerates on the round table is not uniform, which may cause vibrations in the rollers or balls, resulting in unstable operation. is inhibited.

The present invention installs a storage bin for granular material in the front stage of the above-mentioned crushing device, connects the crushing device and the above-mentioned bin airtightly with a sealed transporter and a sealed chute without a special air seal mechanism, and furthermore, By airtightly connecting a second chute to the supply chute for supplying the relatively coarse particles that have fallen further onto the round table, the granular agglomerates can be continuously and uniformly supplied onto the round table. The present invention provides a device that blocks air leakage from a chute to either no or a very small amount.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram showing an embodiment of the present invention.
In FIG. 1, reference numeral 2 denotes a storage bin for raw material granules, and a level meter 1 is installed in this bin as required. The agglomerates are fed from the storage bin 2 via a transporter 3 and a feed chute 4 onto a round table 11 of a grinding device 6 .

Storage bin 2, transporter 3, and supply chute 4
are airtightly connected and are closed-off from outside air.

Hot gas is led from the lower part of the crushing device 6 through a duct 10 for drying and transporting the granular material, passes through a gap 12 around the round table 11, and is passed through the crushing device 6.
Among them, separator 13 and cyclone dust collector 8
The air is then exhausted by a fan 9.

On the other hand, the granular material supplied onto the round table 11 is crushed and crushed by rollers or balls.
The coarser particles that have fallen further are returned to the round table 11 via the second chute 5 by a suitable transporter 7. The transport aircraft 7 and the second chute 5 are connected and are of a closed type that is cut off from the outside air. Note that no special air seal mechanism such as a damper or rotary valve is installed in the two chutes 4 and 5.

In the present invention, the transporter 3 and the chute 4 are hermetically connected, the level of the agglomerates in the storage bin 2 is maintained constant by installing a level meter 1, and the second chute 5 is connected to the chute 4. 4, air leakage from the supply chute 4 caused by the negative pressure within the crushing device 6 can be eliminated to a very small amount.

The connection position between the second chute 5 and the supply chute 4 is not limited as long as it is in the middle of the supply chute 4.

The effects of airtightly connecting the second chute 5 are as follows.

When the hot gas introduced into the crushing device 6 blows through the gap 12 around the round table 11 to the upper part of the round table 11, a large pressure loss is involved. There is a difference, and from below the round table 11, the transport aircraft 7 and the chute 5, 4
Since the route passing through is made into a closed route, a part of the hot gas passes through this closed route to the outside of the crushing device. By designing the ventilation resistance of this sealed path to an appropriate value, it is possible to appropriately adjust the amount of hot gas passing through the chute, alleviate the negative pressure inside the chute 4, and reduce the amount of air leaking from the chute 4. It is possible to reduce the amount to none or to a very small amount.

As described above, the present invention can ensure the continuous and uniform supply of granules without providing a special air seal mechanism in the granules supply chute 4, and can also ensure the continuous and uniform supply of granules into the storage bin 2 of the granules. By maintaining the level of the agglomerates at a level that allows air sealing with the agglomerates, and by tightly connecting the two chute 4 and 5, the amount of air leaking from the chute 4 can be eliminated or extremely small. It can be done.

The present invention is constructed as described in detail above, and is capable of improving grinding efficiency, reducing power consumption, and eliminating troubles caused by vibrations, etc., in a closed-type grinding device having a round table.
Stable operation of the crushing equipment has become possible.

In addition, the present invention is suitable for cases in which air, low-temperature gas, etc. are used for conveying the pulverized powder without the need to dry the granular material, or when air for conveyance is transferred from the fan 9 to the duct 10.
It can also be applied to cases where it is used for circulation. That is, in these cases as well, it is desirable to block air leaking from the chute 4, and the present invention can be effectively applied.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of the present invention. 1... Level meter, 2... Raw material granule/agglomerate storage bin, 3... Transport machine, 4... Supply chute, 5...
Second chute, 6...Crushing device, 7...Transporter, 8...Cyclone dust collection air, 9...Fan, 1
0...Duct, 11...Round table, 12...Gap around the round table, 13...Separator.

Claims (1)

[Scope of utility model registration request] A closed type that crushes and crushes the raw material granules supplied to a rotating round table using a plurality of rollers or balls, and then circulates the relatively coarse particles that have fallen from the round table again to the round table to crush and crush them. In the crushing device, a storage bin for the raw material granules is provided, and the bin and the crushing device are airtightly connected to each other by a closed type transporter and a closed chute, and during the chute, a comparatively large amount of material that has fallen from the round table top is removed. A granular material feeding device characterized in that a second chute for returning coarse particles back onto a round table is airtightly connected.