JPS6039055Y2 - 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 that can protect a dust collector from fire by capturing sparks, sparks, or high-temperature dust that are sent together with dust when it passes through a filter.

Polishing and grinding operations performed using a buffing machine, PVA grindstone, abrasive cloth, or abrasive paper may cause the binding material base fabric or base paper to scatter as combustible fine dust during the work. sparks are also generated.

If this fine dust is collected directly at the source using a dry dust collector, the above-mentioned sparks will also be sucked in together with the fine dust, so the fine dust ignited by the sparks will turn into sparks. It may be sucked into the dust collector and burn to the bag filter, causing a fire in the dust collector.

Pre-dust boxes are generally used to prevent the above-mentioned fires, but the conventionally used baffle plate type or cyclone type pre-dust boxes do not allow a large amount of sparks generated during work to enter the box. When this occurs, the sparks may ignite the combustible fine dust that has accumulated or adhered to the inside of the box, causing the fire to spread, causing sparks to be sent to the dust collector. Therefore, with conventional pre-dust boxes, the dust collector It was extremely difficult to completely prevent fires.

Therefore, the applicant has developed a pre-dust box that prevents the above-mentioned sparks from being sucked directly into the dust collector by installing a non-flammable filter filled with a large number of non-flammable small particle filter media on the internal dust passage of the pre-tank. , has already filed an application for Utility Application No. 55-45323 dated April 3, 1975, but when using the pre-dust box using the above-mentioned non-flammable filter, dust adheres to the area around the non-flammable small particle filter medium. To avoid clogging, it is necessary to pull out the non-flammable filter from the inside of the pre-tank and clean it at regular intervals.This work is surprisingly troublesome, and the dust thrown up during the operation can damage clothing, surrounding floors, etc. There was also the problem of getting it dirty.

Therefore, in view of the above-mentioned points, the present invention aims to provide a pre-dust box for a dust collector configured so that cleaning of the non-combustible filter filled with the above-mentioned non-flammable small particle filter medium is extremely easy. Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the figure, 1 indicates a pre-tank which is the main body of the pre-dust box, and one side of this pre-tank 1 (back side in Fig. 1)
A dust suction port 1a to which a dust suction pipe 2 is connected is opened,
Further, on the other side (the left side in FIG. 1), a dust inlet 1b to which a pipe 3 on a dust collector (not shown) is connected is opened.

A dust collecting hood (not shown) is attached to the tip side of the dust suction pipe 2, and a baffle plate 4 is attached inside the dust suction port 1a as shown in FIG. 2.

5 is a dust collection packet stored in the bottom of the pre-tank 1 so as to be freely drawn out, and 6 represents the dust collected in this packet 5.

Further, the reference numeral 7 indicates a non-flammable filter, and this filter 7 is rotatably housed inside the pre-tank 1.

As shown in the figure, the non-combustible filter 7 has an internal ventilation cylinder 7a made of a punched wire mesh or punched plate inside an external ventilation cylinder 7a made of a cylindrical wire mesh or punched plate made by punching out a thin metal plate. 7b concentrically, one end surface of the circumferential cylindrical bodies 7a and 7b is closed with one side plate 7c, and the other side is closed with the other side plate 7d which has a dust feed hole 7d' opened in the center, and the above-mentioned Circumferential cylinder? It has a structure in which a large number of non-flammable small particle filter media 8 are housed in the interval 7 of at7b in an amount slightly smaller than the total volume of the internal space of the interval 7' so as to always maintain a constant space 8' on the upper side. As the nonflammable small particle filter medium 8, for example, gravel having a diameter of about 2 to 107 m is used.

Reference numeral 9 denotes a rotating shaft inserted longitudinally through the center of the nonflammable filter 7, and one end 9a of this rotating shaft 9 is connected to a bearing 1 provided in the pre-tank 1 through the center of the one side plate 7c.
0 protrudes from the outer surface of the pre-tank 1, and the other end 9b side is supported by a bearing 11 provided inside the dust collector side piping 3 through the dust sending hole 7d', and the other end 9b side is supported by a bearing 11 provided inside the dust collector side piping 3, and
is fixed to this rotating shaft 9.

Furthermore, the tip lower d'' of the dust feeding hole 7d' opened in the other side plate 7d is tightly and rotatably fitted into the dust feeding port 1b, and therefore the entire nonflammable filter 7 is is designed to rotate within the pre-tank 1 when the rotating shaft 9 is rotated.

Note that 12 indicates a gasket attached to the inner circumferential surface of the dust inlet 1b.

Reference numeral 13 indicates a cover plate provided along the upper surface of the nonflammable filter 7.

This cover plate 13 is installed between the upper inner wall surfaces of the pre-tank 1 so as to be close to the upper outer peripheral surface of the nonflammable filter 7, and the inner surfaces of the upper and lower ends are covered with seals, asbestos, ceramic fibers, felt, etc. The packings 13a and 13b made of
3a and 13b are in contact with the outer peripheral surface of the nonflammable filter 7, respectively.

The amount of nonflammable small particle filter medium 8 accommodated within the interval 7' of the nonflammable filter 7 is set to be slightly smaller than the total internal space capacity of the interval 7' as described above. When the non-flammable filter 7 is rotated, for example, in the direction of arrow X in FIG.
As a result, the dust-containing air sucked into the pre-tank 1 from the dust suction port 1a passes through this space 8'.

The cover plate 13 described above is for preventing the dust-containing air from passing through, and the dust-containing air reliably passes through the layer of the nonflammable small particle filter medium 8 without passing through the space.

In addition, in the case of a structure in which the nonflammable filter 7 is rotated in a counterclockwise direction opposite to that shown in FIG. 2, the cover plate 13 may be attached to the upper left side portion opposite to that shown in the figure.

In FIG. 1, reference numeral 14 denotes a pulley or sprocket fixed to one end 9a of the rotating shaft 9 protruding from the outer surface of the pre-tank 1, and this pulley or sprocket 14 and the pulley or sprocket 16 on the motor 15 side A belt or chino 17 is stretched between the two, and when the motor 15 is started, the rotating shaft 9 rotates and the non-flammable filter 7 can be rotated.

Since the pre-dust box according to the present invention has the above-described configuration, among the dust sucked into the pre-tank 1 from the dust suction port 1a by the operation of the dust collector, relatively large dust first hits the baffle plate 4 and enters the dust collection packet. Dropped within 5.

The dust-containing air that has been subjected to the primary separation of dust in this way passes through the layer of the non-flammable filter non-flammable small particle filter medium 8, enters the internal ventilation cylinder 7b, and further enters the dust-feeding hole 7d' and the dust-feeding port 1b. The dust passes through the pipe 3 and is sucked into the dust collector side.

Furthermore, during the above dust collection operation, if fine dust is ignited by sparks generated by polishing or grinding work, and the sparks enter the pre-tank 1 and ignite the collected dust 6 that has accumulated,
Since the non-flammable filter 7 prevents the scattering (suction) of sparks into the dust collector, and also prevents the intrusion of high-temperature dust,
It can protect the dust collector from fire.

If the nonflammable filter 7 becomes clogged due to dust adhering and accumulating on the nonflammable small particle filter medium 8 due to long-term dust collection operation, the motor 15 is started and the rotating shaft 9 removes the nonflammable filter 7. All you have to do is rotate.

When the non-flammable filter 7 is rotated as shown in FIG. 2, the non-flammable small particle filter media 8 collapse in the space 8'.
Through this movement and agitation, the dust that has adhered to and accumulated on each of the nonflammable small particle filter media 8 is efficiently separated, and the separated dust is further sieved by the punched wire mesh or punch plate of the internal ventilation cylinder 7b. Since the dust is sucked into the dust collector side, any clogging of the nonflammable filter 7 can be completely eliminated.

Further, the outside of the space 8' is covered with a cover plate 13,
In addition, the distance between the cover plate 13 and the outer peripheral surface of the nonflammable filter 7 is determined by the gaskets 13 attached to the upper and lower ends of the cover plate 13.
Since it is sealed by a and 13b, dust-containing air containing sparks is prevented from passing through the space 8'.

In the illustrated embodiment, the rotating shaft 9 of the nonflammable filter 7 is
Although a structure is shown in which the filter 7 is automatically rotated by the motor 15, it is also possible to attach a crank to one end 9a of the rotating shaft 9 and rotate the nonflammable filter 7 manually.

As mentioned above, the pre-dust box for the dust collector of the present invention is expensive because the non-flammable filter in the pre-tank can capture the sparks of dust generated during polishing and grinding operations and prevent them from scattering to the dust collector. In addition to protecting the dust collector from fire and allowing the above operations to proceed safely, if the non-flammable filter becomes clogged due to dust adhesion or accumulation due to long-term operation, the rotating shaft will remove the non-flammable filter. Just by rotating the whole unit, you can remove the dust that has adhered to or accumulated on the non-flammable small particle filter media and unclog the filter, making it extremely easy and reliable to clean the non-flammable filter. Moreover, since the space for eliminating clogging of the non-flammable small particle filter medium is covered by a cover plate sealed with a packing, dust-laden air containing sparks will be absorbed into this space. There is no problem of the dust passing through the parts and being sucked into the dust collector side. Therefore, it is suitable for use in, for example, a local dust collector type dust collector that collects dust generated by polishing and grinding work directly at the source. be.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line A--A in FIG. 1... Pre-tank, 1a... Dust suction port,
1b... Dust inlet, 2... Dust suction pipe,
3... Dust collector side piping, 7... Nonflammable filter, 7a... External ventilation cylinder, 7b...
...Internal ventilation cylindrical body, 7c...Side plate, 7d
...Side plate, 7d' ...Dust hole, 7d''
...Tip opening, 7'... Spacing, 8...
...Nonflammable small particle filter medium, 8'...Space, 9
...rotating shaft, 9a... one end of the rotating shaft,
13...Cover plate, 13a, 13b...
・Patsukin.

Claims (1)

[Scope of utility model registration request] Inside the pre-tank, which has a dust inlet to which the dust suction piping is connected and a dust inlet to which the dust collector side piping is connected, an internal and external ventilation cylindrical body made of punched wire mesh or punched plates is installed in two concentric layers. Due to the structure, both end faces of this double ventilation cylinder are closed with side plates respectively, a dust hole is opened in the center of one side plate, and a dust hole is opened in the center of one of the side plates. , A non-flammable filter having a structure containing a non-flammable small particle filter medium in an amount slightly smaller than the total volume of the internal space of the space is rotatably housed so as to maintain a constant space above the space, and A cover plate is provided along the upper peripheral surface of the non-flammable filter so as to cover the space where the non-flammable small particle filter medium is not present, which is created when the non-flammable filter is rotated. In addition to attaching a sealing gasket that contacts the outer circumferential surface of the non-flammable filter, the tip of the dust-feeding hole and the dust-feeding port of the pre-tank are tightly and rotatably connected; A pre-dust box for a dust collector, characterized in that one end of a rotating shaft for a non-flammable filter inserted in the longitudinal direction of the center length protrudes from the outer surface of the pre-tank.