JPS5842047Y2 - Artificial mineral fiber spraying equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an apparatus for spraying artificial mineral fibers.

In this type of spraying equipment, the mixed material obtained by pre-mixing the fiber raw material and a powdery binder such as cement is defibrated and dispersed using members such as clothing and blower blades. A model has been proposed in which this is air-transported into a hose, mixed with water at a nozzle, and sprayed.

However, when using the above-mentioned spraying equipment, the fibers may be cut into short pieces due to the shearing force caused by the impact of the mixed powder during the process of dissolving and dispersing the mixed material of the fiber raw material and the binder. It has the disadvantage of causing fiber granulation.

In particular, for artificial mineral fibers made by melting mineral raw materials such as silica and alumina at high temperatures and scattering them by flowing them down onto a rotating disk, or by blowing off the molten raw materials with high-speed air, Since it is easily plastically deformed, when external force is applied, several fibers tend to become entangled and become granular, and the fibers themselves are also brittle and break easily.

The above-mentioned artificial mineral fibers made from silica, alumina, etc. have much higher heat resistance than mineral fibers such as rock wool, slag wool, and glass fibers, making them extremely suitable as fireproof and insulating wall materials for furnaces. However, with the above-mentioned spraying, the fibers after being defibrated and dispersed by the equipment are often cut into short pieces or granulated, so the sprayed walls are not sufficiently defibrated. Compared to walls containing long fibers, the fibers are less intertwined and have lower strength, resulting in cracks, peeling, and falling off, which can lead to furnace accidents.

This idea is based on the above-mentioned defibrating action of artificial mineral fibers, which hardly causes the fibers to be cut or granulated, and the artificial mineral fibers are defibrated and sprayed in a state close to a single fiber. is intended to provide equipment.

Hereinafter, this invention will be explained in detail based on the drawings showing the embodiments thereof.

In the drawing, 1 is a housing that partitions and forms a defibration chamber, the upper half of which is formed by a semicircular surrounding wall 1a, and the lower half of which is formed by a hopper-shaped surrounding wall 1b. , a rotary body 3 having a large number of blade-shaped protrusions 2 around the semicircular scale wall 1a is rotatable, leaving an arc-shaped gap 4 between it and the surrounding wall 1a. It is located.

An opening is formed in the housing 1 at a portion corresponding to the base end of the arc-shaped gap 4, and a pair of feed rollers 5 are disposed therein so as to face the circumferential surface of the rotating body 3.

On the outside of the housing 1, near the roller 5,
A device is provided for feeding the fibers by means of a conveyor belt.

In other words, 6 is an outer endless running belt, 7 is an inner endless running belt), 8, 9, 10, and 11 are belt guide rollers, and the outer belt 6 has a plurality of width belts arranged in parallel with a required gap. A large number of nails 12 are implanted on the surface of the inner belt 7 so as to protrude outward through the gaps between the belt parts of the outer belt 7 on the running path overlapping with the outer belt 6. The mineral fibers fed into the hopper 13 are scraped up by the nails 12 of the belt 7 when the belts 6 and 7 run, and after passing through the baffle plate 14, the excess is scraped off. It is sandwiched between rollers 5 and supplied into the housing 1 from there.

A blower 1 is installed at the bottom of the housing 1 on its side surface.
A transport hose 16 is connected to the transport hose 16 through a fiber injection nozzle 16a at the tip thereof, and a sprayer 17 for spraying an aqueous solution of a binder is installed on the outer circumference of the fiber injection nozzle 16a.

In other words, 18 is an annularly formed container body, 19 is a plurality of annular channels formed concentrically inside the container, 20 is a passage connecting the annular channels, and 21 is a front surface of the container that communicates with the passages. The spray holes 22 are open to the plurality of annular passages 19.
a liquid supply valve attached to the vessel so as to communicate with one of the
is a hose connected thereto, and 24 is a pump device for pumping the binder aqueous solution, and the fiber material sprayed from the nozzle 16a comes into contact with the binder aqueous solution sprayed from the spray hole 21 immediately after the spraying. It is mixed and sprayed onto the construction surface.

As the binder, an aqueous solution of lithium silicate or a water-dispersible material such as colloidal silica, colloidal alumina, or cement is suitable.

In the above-described spraying device, the artificial mineral fiber material introduced into the hopper 13 is carried by a belt member consisting of an outer belt 6 and an inner belt 7, and a feed roller 5,
5 into the housing 1, is combed out by a large number of rectangular protrusions 2 on the circumferential surface of the body 3 rotating at high speed, passes through the arcuate gap 4 between it and the semicircular surrounding wall 1a, and passes through the hopper-shaped surrounding wall 1b. The released fibers are transported by the blower 15 to the nozzle 16a of the hose 16 and sprayed from there, and the sprayed fibers contain the bond sprayed from the spray hole 21 of the sprayer 17. The aqueous solution of the agent is contacted, mixed, and sprayed onto the construction surface.

According to the spraying device configured as described above, the fibers fed into the housing are combed out by the rectangular protrusion 2 on the circumferential surface of the rotary drum while being held between the pair of rollers 5, 5. Most of the fibers are definitely defibrated.

When mineral raw materials such as silica and alumina are made into fibers by the method described above, a large amount of shot (which remains in the form of fine particles without being made into fibers, accounts for 50 to 55% of the total weight).
However, most of this shot is separated from the fiber part and dropped downward during the combing action by the protrusion 2, and the fibers that have been combed and have less shot are thrown into the semicircular enclosure wall. Arc-shaped gap 4 between 1a and the fuselage 3
At this time, the fibers are defibrated by contact with the square projections 2 and the inner surface of the surrounding wall 1a while being carried by the air flow generated by the rotation of the body.

After passing through the arcuate gap 4, the fibers defibrated in this way are discharged to the lower part of the body 3, and the hopper-shaped surrounding wall 1
Blower 1 falls to the bottom of b and with a shot above its bottom
5 and transported toward the nozzle 16a,
If the blower 15 is disposed close to the bottom of the hopper-shaped enclosure wall 1b where shot accumulates, the shot, which is heavier than the fibers, can be drawn out smoothly. There is no danger that the transport hose will become clogged, and the pneumatic transport of the fibers can be carried out without any hindrance.

As described above, according to this invention, the fiber defibrating section is constituted by a rotating body having a large number of disassembling protrusions on the circumferential surface and a housing that houses the rotary body, and the housing is the upper half of the rotating body. The lower half is formed by a hopper-shaped surrounding wall, and the lower half is formed by a hopper-shaped surrounding wall that surrounds a part of the circumferential surface of the rotating body in a substantially concentric manner with a required gap. A pair of roller members are disposed at the bottom of the hopper weighing wall for pinching the fiber raw material conveyed from the fiber supply device disposed outside the housing and sending it into the housing. An air transport hose is connected through a blower, and a nozzle is formed at the end of the hose to spray the aqueous binder solution mixed with the fibers, so there is almost no cutting or granulation of the fibers. Since it is defibrated and sprayed in a state close to that of a single fiber, a heat insulating wall can be obtained by spraying with high strength.

In particular, its true value is demonstrated when spraying fibers that are easily cut and granulated, such as artificial mineral fibers made from mineral raw materials such as silica and alumina.

In other words, the spraying according to this invention uses a machine that allows the artificial mineral fibers of the sprayed insulation wall to remain intertwined with each other, and to create a structure with high strength that can withstand long-term use even at high temperatures of over 1000 degrees Celsius. A fireproof and insulated wall is obtained.

In addition, since defibration is performed reliably in the defibration section, the pressure resistance of pneumatic transportation is kept low, making long-distance transportation possible.
It also has excellent advantages, such as uniform mixing with the binder.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of an apparatus for spraying artificial mineral fibers showing an embodiment of this invention, Fig. 2 is a partially cutaway perspective view of the fiber supply mechanism, and Fig. 3 is a longitudinal side view of the nozzle part. FIG. 4 is an end view. In the drawing, 1 is a housing, 2 is a combing projection, 3 is a rotating body, 4 is a gap, 5 is a fiber feed roller, 6 is an outer belt, 7 is an inner bell l-, 8, 9, 10, 11 are Belt guide roller, 12 is a nail, 13 is a hopper, 14 is a baffle plate, 15 is a blower, 16 is a transportation hose, 17 is a sprayer,
21 is a spray hole, 22 is a liquid supply valve, 23 is a binder transport hose, and 24 is a pump device.

Claims (1)

[Scope of utility model registration request] A fiber defibration section is constituted by a rotating body having a large number of combing protrusions on its surface and a housing that accommodates the same, and the upper half of the housing covers a part of the circumferential surface of the rotating body with a required gap. It is formed by an enclosing wall that surrounds it almost concentrically,
The lower half is formed of a hopper-like enclosure wall, and the housing has a portion facing the circumferential surface of the body that holds the fiber raw material conveyed from a fiber supply device disposed outside the housing and feeds it into the housing. A pair of roller members are disposed for feeding the hopper, an air transport hose is connected to the bottom of the hopper-shaped wall via a blower, and a nozzle is provided at the tip of the hose for spraying an aqueous binder solution mixed with the fibers. An apparatus for spraying artificial mineral fibers.