JPS6027449Y2 - Pre-dust box for dust collector - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a pre-dust box for preventing fires in a dust collector.

Polishing and abrasive work performed using a puff sander, PVA grindstone, abrasive cloth, or abrasive paper may cause the binding material, base fabric, or paper to become flammable fine dust and scatter during the work. Sparks are also generated, so if this fine dust is collected directly at the source using a dry dust collector, the above sparks will also be sucked in along with the fine dust, so the bag filter of the dust collector should not be used. A spark could ignite and cause a fire, and the loss due to burnout of the dust collector was very large, and it was also dangerous.

The process by which the dust collector ignites due to the above spark and leads to a fire will be explained with reference to the conventional device shown in Figure 1.
is a puff or grinding wheel rotated by a motor, and when the workpiece material A is pressed against this grinding wheel 1,
Sparks 1a... are generated together with fine dust.

If the length of the piping 3 leading to the hood 2 and the piping 3' of the dust collector 4 connected to this piping 3 is at least 1 to 2 m, the generated sparks 1a will disappear midway and be directly transmitted to the dust collector. 4
Although it does not reach the inside of the dust collection hood 2, as shown in the figure,
If dust 5 accumulates at the curved part of the pipe 3 or at the joint between the pipes 3 and 3', it will be ignited by the spark 1a, causing a fire.

Since air is flowing inside the pipe 3 at a rate of 10 skins/sec or more, the ignited dust 5 turns into sparks while burning and is collected by the dust collector 4.
The dust 6 enters the interior and ignites the accumulated dust 6, and the ignited dust 6 turns into sparks and flies up as the air flows. Over time, the flame spreads and burns to the filter 7, causing the entire dust collector 4 to catch fire. I'm disappointed.

Pre-dust boxes are generally widely used as a fire prevention measure as described above.

2 and 3 show examples of conventionally used pre-dust boxes, and the pre-dust box 8 shown in FIG. 2 has a structure in which a baffle plate 8a is provided inside. The pre-dust box 9 shown in FIG. 3 has a simple cyclone inside.

When the conventional pre-dust boxes 8 and 9 configured in this way are installed in the middle of the pipes 3 and 3', the pre-dust box 8 shown in FIG. 2 has the same effect as the device shown in FIG. However, if a large amount of sparks 1a... enter, the accumulated dust 8b will be ignited, causing the problem that the sparks will be sent to the dust collector 4. In this case, the fine dust 5 often adheres to the inner wall surface of the tank, and the spark 1a ignites the adhered fine dust 5, causing further accumulated dust 9a to ignite.
In many cases, the dust ignites and the sparks are sent into the dust collector 4 side, so neither of the pre-dust boxes 8 and 9 could completely prevent a fire in the dust collector 4.

In view of the above-mentioned points, the present invention prevents sparks from entering the dust collector and protects the dust collector from fire by fitting a non-flammable filter unit filled with non-flammable small particles onto the internal dust suction passage of the pre-tank. The purpose of the present invention is to provide a pre-dust box for a dust collector that is devised so that the above-mentioned non-flammable filter unit can be easily cleaned and the decrease in air volume due to clogging can be easily resolved. Embodiments of the present invention will be described in detail with reference to FIGS. 4 to 7.

4 and 5 are sectional views showing the internal structure of the pre-dust box according to the present invention, and in the figures, 10 indicates a pre-tank which is the main body of the pre-dust box.

One side of this pre-tank 10 is provided with a dust inlet 11 to which the pipe 3 on the dust collection hood 2 side shown in FIG. 1 is connected, and the other side is connected with the pipe 3' on the dust collector 4 side. A suction port 12 is provided.

Next, 13 is a dust collection packet stored in the bottom of the pre-tank 10 so as to be freely drawn out, and 14 is this dust collection packet 13.
Shows dust trapped inside.

Further, generally indicated by the reference numeral 15 is an independent compartment provided inside the pre-tank 10, and the interior 15' of the compartment 15 is directly connected to the suction port 12.

The upper surface of the partitioned chamber 15 constructed as an independent structure as described above has a large opening so as to communicate with the inside of the pre-tank 10, and the storage chamber 16 formed in this opening has an internal diameter of 2 to 10 mm. A nonflammable filter unit 17 filled with a large number of nonflammable small particles 18 of about mm size is fitted.

Gravel is usually used as the non-flammable small particles 18, and
Nonflammable filter unit 1 shown in Figures 4 and 5
7 fills the inside of a filter frame 17a made of a thin steel plate into a substantially box shape with an open top surface, and fills the above-mentioned small nonflammable particles 18 with a large number of punches on the bottom surface of the filter frame 17a. 17b..., but this is an example of implementation.

6 and 7 show a second embodiment of the above-mentioned non-flammable filter unit, and the non-flammable filter unit 17' of this embodiment has a front and rear opening surface of a filter frame 17c made of a thin steel plate. The part is covered with wire meshes 17d and 17d' made of punched plates or steel plates, and both wire meshes 17d,
If necessary, the surface of 17d' is covered with multiple steel rods 17e...
・It has a structure in which the inside is filled with a large number of the non-flammable small particles 18, and a drawer handle 1 is provided on one side.
7f is installation.

In addition, in Figures 4 and 5, 19 is the pre-tank 1.
19' indicates a handle attached to the cover plate 19.

Reference numeral 20 denotes a bottom plate of the compartment 15, which has a mechanism that allows the bottom of the compartment 15 to be freely opened by sliding in the direction of the arrow in FIG. The front wall of the chamber 15 has an inclined surface 15'' that is slightly inclined downward as shown in the figure.

Moreover, the nonflammable filter unit 17 shown in FIGS. 4 and 5 can be installed in the storage chamber by removing the lid 19.
6 and 7.
In the case of the nonflammable filter unit 17' shown in the figure,
Fitting and removal are performed from the side of the pre-tank 10, as shown by the imaginary lines in FIG.

Since the pre-dust box according to the present invention has the above-described configuration, when using it, first connect the pipe 3 on the dust collection hood 2 side shown in FIG. Connect the pipe 3' on the dust collector 4 side.

Next, when the dust collector 4 is operated to collect dust and the work is carried out by pressing the workpiece material A against the rotating grindstone 1, the dust generated by the work is absorbed by the dust collector 4 and collected into the dust collection hood 2.
The dust enters the pre-tank 10 through the piping 3, and among the sucked dust, relatively large dust enters the slope 1 of the compartment 15.
5'' and is dropped into the dust collecting packet 13 as shown by the arrow in FIG.

The dust-containing air from which relatively large dust particles have been separated by the inclined surface 15'' is further subjected to the suction action of the dust collector 4 and rises as shown by the arrow in FIG.
and piping 3' from the suction port 12 through the interior of the compartment 15.
The dust is then sucked into the dust collector 4 side.

During the above dust collection operation, the sparks 1a generated from the grinding wheel 1 ignite the combustible fine dust 6 accumulated in the dust collection hood 2 and piping 3, and the sparks enter the pre-tank 10 and accumulate collected dust 14. If the dust collector 4 catches fire, the nonflammable filter unit 17 or 17' can prevent the dust collector 4 from catching fire.

That is, even if sparks start scattering due to the ignition of the collected dust 14, the non-flammable filter unit 17 or 17' can block this and prevent the sparks from entering the dust collector 4, and the temperature will rise due to the ignition. Since the nonflammable filter 17 or 17' absorbs the temperature of the dust-containing air, it is also possible to prevent high-temperature air from entering the dust collector 4.

If the collected dust 14 begins to burn violently over time, the dust collector 4 cannot be used with only the nonflammable filter 17 or 17'.
However, this problem can be solved by providing a damper (not shown) in the suction port 12 that closes when the temperature inside the pre-tank 10 reaches the set temperature, or
This can be easily solved by providing a water sprinkler pipe (not shown) inside.

Non-flammable filter unit (1) due to long-term dust collection operation
If dust accumulates on the surface and inside of the filter unit 7.17', so-called clogging occurs and the air volume decreases, so it is necessary to clean the non-flammable filter unit 17.17' to eliminate clogging.

Nonflammable filter unit 1 shown in Figures 4 and 5
When cleaning the cover plate 7, clean the cover plate 1 while operating the dust collector 4.
9 is opened and the nonflammable small particles 18 in the nonflammable filter unit 17 are stirred using a rod or rake, etc., the dust adhering to the nonflammable small particles 18 is separated and sucked into the dust collector 4 side. It can be collected to eliminate clogging.

In addition, when cleaning the nonflammable filter unit 17' having the unit structure shown in FIGS. 6 and 7, the handle 17
Pull the entire nonflammable filter unit 17' out of the pre-tank 10 by holding a When the filter unit 17' is turned upside down and inserted into the storage chamber 16 of the pre-tank 10 again, the separated dust is sucked into the dust collector 4 side and becomes non-flammable small particles 18.
... is cleaned, thereby eliminating clogging.

In addition, both the above-mentioned flammable filter units 17 and 17
Another method for cleaning the filter unit 17' is, for example, a method of automatically cleaning the non-combustible filter unit 17, 17' by vibrating it using a vibrator. nonflammable filter unit)
If some kind of shock is given to 17, 17', the dust attached to the non-flammable small particles 18 can be separated and the clogging can be eliminated.

The dust that has passed through or been brushed off by the non-flammable filter unit 17, 17' by the suction action of the dust collector 4 is transferred to the compartment 1.
The dust is sucked into the dust collector 4 side through the interior 15' of the dust collector 5, the suction port 12, and the piping 3', and during this suction, the compartment chamber 15
A part of the dust accumulated on the inner bottom of the dust collection packet 13 can be dropped into the dust collection packet 13 by pulling out the bottom plate 20 in the direction of the arrow in FIG.

As described above, according to the pre-dust box of the present invention, the compartment in the pre-tank and the non-flammable filter unit fitted into the top opening of this compartment block sparks generated during a fire, and the sparks are sent to the dust collector. Since the scattering of dust can be prevented, expensive dust collectors can be protected from fire and various operations such as polishing and grinding can be carried out safely.

In addition, in the present invention, the front wall of the compartment facing the dust suction port is a sloped surface that is slightly tilted downward, so this slope performs the same function as a baffle plate, allowing the dust to be sucked from the dust suction port. Dust Comparatively larger dust particles than those in the air can be separated and dropped directly into the dust collection packet, and therefore,
Since there is no need to install a baffle plate inside the pre-tank, the configuration can be simplified accordingly, and since the above-mentioned non-flammable filter unit is installed at the top opening of the compartment, there is no need to install a baffle plate inside the pre-tank. It is extremely easy to remove clogged filters from the outside of the pre-tank to remove adhering dust. For example, a local dust collection type that sucks up dust generated by polishing, grinding, etc. directly at the source. Suitable for use in dust collectors.

[Brief explanation of drawings]

1, 2, and 3 are cross-sectional views of the conventional example, FIG. 4 is a cross-sectional view showing an embodiment of the present invention, and FIG. 5 is a cross-sectional view of the conventional example.
6 is a perspective view showing an embodiment of the nonflammable filter, and FIG. 7 is a sectional view taken along line Y--Y in FIG. 6. 4... Dust collector, 10... Pre-tank,
11... Dust suction port, 12... Suction port, 1
5... Compartment, 15z... Inclined surface, 17
．． 17'...Nonflammable filter unit, 18
......Nonflammable small particles.

Claims (1)

[Scope of utility model registration request] An independent compartment that communicates with the suction port is installed inside a pre-tank that has a dust suction port open on one side and a suction port leading to a dust collector on the other side. A non-flammable filter unit filled with a large number of small non-flammable particles is fitted into the opening, and the front wall of the compartment facing the dust suction port is slightly turned downward. A pre-dust box for a dust collector characterized by being tilted.