JP3335813B2 - Pre-dust box for dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preduster box capable of preventing a dust collector from fire.

[0002]

2. Description of the Related Art A buffing machine, a PVA magnet, a polishing cloth,
In the polishing and grinding operations performed using abrasive paper or the like, a binder, a base cloth, a base cloth, and the like are scattered as flammable fine particles at the time of work, and a spark is generated.

When the fine dust is directly collected at a source using a dry (bug filter) dust collector, the above-mentioned sparks are also sucked together, so that the dust collector often ignites and causes a fire. There was a problem that occurred, and the loss due to burnout of the dust collector was large and very dangerous.

FIG. 4 shows an example of a conventional apparatus for explaining the process of igniting a dust collector by the above-mentioned spark and leading to a fire. In the figure, reference numeral 11 denotes a buffing or grinding wheel, and 12 denotes this grinding wheel. A dust collecting hood 13 covers the dust collecting hood 12 and a pipe connecting the dust collecting hood 12 and the dust collector 14.
Reference numeral 4 includes a baffle plate 14a, a filter 14b, a dust suction fan, and a motor 14c.

[0005] When the work 15 is pressed against the grindstone 11 serving as a dust generation source of the apparatus constructed as described above, a spark 11a is generated together with the fine dust.
No matter how much the amount a is, it disappears on the way if the pipe 13 is 1 to 2 m, and does not directly reach the dust collector 14 and cause ignition.

However, as shown in the drawing, if fine dust 16 generated by the work accumulates in the dust collecting hood 12 or the curved portion and the connection portion of the pipe 13, it is ignited by the spark 11a and causes a fire.

Since air flows in the pipe 13 at a speed of 10 m / sec or more, the ignited dust 16 burns violently, becomes a large spark, enters the dust collector 14, ignites the accumulated dust 17, and then flows the air. The dust 17 ignited together with the dust forms a spark and soars, spreads over time and burns to the filter 14b.
4 will cause a fire.

Accordingly, the present applicant has proposed Japanese Utility Model Publication No. 60-20417 and Japanese Utility Model Publication No. 60-27 as a fire prevention measure.
Nos. 449, 60-39050, 60-3
A pre-dust box for a dust collector having various structures as disclosed in JP-A-9053 and JP-A-60-39055 has been developed.

[0009]

However, in any of the above-mentioned pre-dust boxes for dust collectors, a non-combustible filter is mounted inside a pre-tank body, and sparks, sparks, or high-heat dusts sent together with the dusts. Is trapped when passing through this non-combustible filter to prevent the occurrence of fire.As a result, pressure loss occurs, and if the filter is continued to be used, the filter is clogged and the resistance further increases. There was a problem that increased.

In addition, the above-described non-combustible filter has a structure in which a large number of non-combustible small particles such as gravel are filled in a punched wire mesh or a filter frame on which a punch plate is stretched. There is also a problem that the dust accumulated on the conductive filter burns, and a problem that the filter itself is expensive and increases the overall cost of the dust collector.

Therefore, the technical problem of the present invention is to provide a pre-tank body having a relatively simple structure without using a high-cost incombustible filter, so that sparks, sparks, Another object of the present invention is to provide a pre-dust box for a dust collector which is designed to catch high-heat dust, extinguish the fire reliably, and protect the dust collector from fire.

[0012]

Means taken by the present invention to solve the above-mentioned technical problems are as follows.

(1) A pre-tank body which is formed in a substantially cylindrical cross-section and has a dust suction port communicating with a dust generating source and a suction port communicating with a dust collector in a tangential direction of each of the lower and upper peripheral surfaces. On the inner wall of the door with a large ventilation hole
Spaces up and down between multiple baffle plates formed in a donut shape
, And adjust the inside diameter of the ventilation holes of each of these baffle plates.
Make the lower one larger and the upper one smaller
As well as the uppermost one of the above baffle plates.
As the full board goes down, its inner diameter gradually narrows
It should be formed in a tapered cylindrical shape that is inclined at an angle . (Contract
Claim 1)

(2) A discharge hole for dropping dust is provided in the bottom plate of the pre-tank body, and a dust collection bucket is attached to the lower side of the discharge hole so as to be able to be pulled out. (Claim 2)

According to the means of the first aspect described in the above (1), the dust sucked into the pre-tank body from the dust suction port on the lower side is transferred along the inner wall of the pre-tank body having a substantially cylindrical cross section. Since it is configured as an inverted cyclone that gradually rises while turning and sucks the dust from the suction port on the upper side toward the dust collector, a longer fire extinguishing time can be taken compared to the size of the pre-tank body . Dust that rises while turning along the inner wall of the pre-tank body should be provided on the way.
It hits the inner wall of the pre-tank body violently and repeatedly, hitting the baffle plate in the shape of a donut disk with a large vent hole opened in the center, so it exhibited an excellent fire-extinguishing function and was sucked into the pre-tank together with dust. It is possible to surely extinguish a spark of fire and prevent a fire from occurring.

Furthermore, according to the means described in (1), a plurality of donut-shaped baffle plate attached to the inside of a substantially cylindrical Puretanku body, and the distance that sucked dust is pivoted, the inner wall surface The number of collisions with the baffle plate can be increased proportionally, and the inside diameter of the ventilation hole provided in the baffle plate is made larger on the lower side and smaller on the upper side, so that when the airflow rises, the upper baffle plate In order to suppress the rise of the sparks, it is possible to effectively extinguish the sparks and protect the dust collector from fire.

According further to the means described in (1), in relationship to form a top of the baffle plate to the tapered cylindrical air flow rising along the inner wall surface of the Puretanku body hit the baffle plate As it turns downward, the rise of sparks is reliably suppressed, enabling effective fire extinguishing,
In the uppermost part, the wind speed of the air flow decreases and dust tends to accumulate, but the slope of the tapered baffle plate prevents the accumulation of dust, and the dust naturally slides below the pre-tank body. Make it possible to drop.

According to the means according to the second aspect described in the above (2) , the dust falling on the baffle plate is collected in the bucket through the discharge hole opened in the bottom plate, so that the re-scattering of the dust and the fire Generation can be prevented as much as possible, and the processing of the collected dust can be performed easily.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a pre-dust box for a dust collector according to the present invention.

FIG. 1 is a perspective view showing the appearance of a pre-dust box for a dust collector according to the present invention, FIG. 2 is a plan view thereof, and FIG.
2 is a cross-sectional view taken along the line XX of FIG. 2. In these figures, the reference numeral 1 generally designates a pre-tank having a generally cylindrical cross section. Body, 1
S is an upper lid, 1T is a support base, and the pre-tank body 1 has a smooth inner peripheral surface using a relatively thick metal plate.

Reference numeral 2 denotes a base serving as a base of the pre-tank body 1, 2 T denotes a dust collecting bucket which is housed in the inside 2 a of the base 2 so as to be freely drawn out, and 3 denotes a bottom plate of the pre-tank body 1. In the center of the bottom plate 3 is a drop hole 3 for dropping dust falling into the bucket 2T.
H is drilled, and the dust dropped into the bucket 2T from the drop hole 3H is lifted up by the swirling flow in the bucket 2T, and only heavy dust is deposited in the bucket 2T. It is structured to be done.

Reference numerals 4 and 5 denote a dust suction port and a suction port protruding tangentially to the peripheral surface of the lower and upper portions of the pre-tank body 1. The dust suction port 4 is shown in FIG. The suction port 5 is also connected to a dust collector 14 as shown in FIG.
Is applied to the dust generation source through the pre-tank body 1 so that the dust generated in the dust generation source passes through the pre-tank body 1, is then sucked into the dust collector 14, and is filtered by the filter 14b. I have.

Reference numerals 6, 7, and 8 denote first, second, and third baffle plates which are attached to the inner wall surface of the pre-tank body 1 at intervals from above and below from below, and are interrupted at the lowermost stage. Each of the attached first and second baffle plates 6 and 7 is formed in a substantially donut disk shape having large vent holes 6H and 7H in the center, respectively. It is formed in a tapered cylindrical shape in which the inside diameter of the ventilation hole 8H is gradually narrowed toward the side.

In FIG. 3, S and L indicate the width of each of the first baffle plate 6 and the second baffle plate 7 formed in a substantially donut shape. The relationship is S <
L and therefore the ventilation holes 6 in each of the baffle plates 6 and 7
H, 7H has an inner diameter of 6H> 7H, and the air current rising through the ventilation hole 6H of the first baffle plate 6 hits the second baffle plate 7 protruding upward to effectively disperse sparks. It is designed to extinguish fires.

In FIG. 3, R is the inclination angle (for example, 45 °) of the third baffle plate 8, and P is the third baffle plate 8
The dimension P is the same as the width L of the second baffle plate 7, or P
> L.

In the illustrated embodiment, the number of steps of the baffle plate formed in a substantially donut shape is two. However, the number of steps may be appropriately increased or decreased according to the length of the pre-tank body 1. Therefore, it is needless to say that the present invention is not limited to the two-stage structure shown in the drawings.

As shown in FIG. 3, the first baffle plate 6 is mounted immediately above the dust suction port 4 with no space therebetween, and the third baffle plate 8 is similarly attached to the suction port 5 as shown in FIG. It is installed just below the space.

Since the pre-dust box for a dust collector according to the present invention is configured as described above, the dust sucked into the pre-tank body 1 from the dust suction port 4 by the suction operation of the dust collector is sucked through the dust suction port 4 and the dust collector. Since the mouth 5 protrudes in the tangential direction of the peripheral surface of the pre-tank body 1 having a cylindrical cross-section, it flows into the pre-tank body 1 from the tangential direction and turns along the inner wall surface of the pre-tank body 1. Since it gradually rises, a longer fire extinguishing time can be taken compared to the size of the pre-tank body 1.

The dust swirling in the pre-tank body 1 successively hits the first baffle plate 6 and the second baffle plate 7 during the ascent and repeatedly violently collides against the inner wall surface. Combined with the ability to take out the fire extinguishing time, it is possible to extinguish the sparks rising with the dust.

Further , the inside diameter of the ventilation hole 7H of the second baffle plate 7 is made smaller than the inside diameter of the ventilation hole 6H of the first baffle plate 6, so that when the airflow rises, the sparks strike the second baffle plate 7 in the upper stage. With such a configuration, the fire can be effectively extinguished to prevent the rise of sparks, and since the third baffle plate 8 is formed in a tapered cylindrical shape, the wind speed decreases and dust is easily deposited. Dust can be slid down from the upper surface of the third baffle plate 8 to prevent its accumulation.

[0031]

As described above, according to the pre-dust box for a dust collector according to the present invention, even if a non-combustible filter is not provided inside the pre-tank body, the same fire extinguishing as in the case of using the non-combustible filter is performed. The pre-tank body that can be manufactured at a low cost with a relatively simple structure that does not use a nonflammable filter because it can effectively eliminate the sparks that are drawn into the dust collector by riding the dust flow. Can be used to protect the dust collector from fire.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a pre-tank body constituting a pre-dust box for a dust collector according to the present invention.

FIG. 2 is a plan view of the pre-tank body shown in FIG.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a partial cross-sectional side view illustrating the configuration of a conventional device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pre-tank body 2T Dust collection bucket 3 Bottom plate 3H Discharge hole 4 Suction port 5 Suction port 6,7 Baffle plate formed substantially in the shape of a donut 6H, 7H Vent hole 8 Cylindrical baffle plate inclined in a tapered shape 8H ventilation hole

Continuation of the front page (72) Inventor Yuji Makishima 1-6-2 Shintoda, Hamamatsu-shi, Shizuoka Prefecture Amano Inside the Tsuda Techno Works (56) References JP-A-57-78919 (JP, A) 12211 (JP, U) Japanese Utility Model Showa 54-71261 (JP, U) Japanese Utility Model Utility Model Showa 51-131779 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 45/00-45 / 54

Claims (2)

(57) [Claims] 1. A pre-tank body which is formed in a substantially cylindrical cross section and has a dust suction port communicating with a dust source and a suction port communicating with a dust collector in a tangential direction of each peripheral surface of a lower portion and an upper portion, respectively. Substantially donut with a large ventilation hole in the center on the inner wall
Space multiple baffle plates in the shape of a board up and down
The inner diameter of the vent hole of each baffle plate on the lower side.
Make things bigger, make the upper ones smaller
And the uppermost baffle plate among the above baffle plates
As it goes down, its inner diameter is gradually tapered.
A pre-dust box for a dust collector, which is formed in a tapered cylindrical shape . 2. A dust collecting hole is provided in a bottom plate of the pre-tank body to drop dust, and a dust collecting bucket is attached to a lower side of the discharging hole so as to be able to be pulled out.
The predust box for a dust collector according to 2 or 3.