KR20020069707A - Dry dust processing system in postprocess of casting factory - Google Patents

Abstract

PURPOSE: A dry dust collection system in the postprocess of a foundry or steel casting factory is provided to obtain more than 95% of instant discharging effect of dust generated by adopting a downward exhaustion method. CONSTITUTION: The dry dust collection system in the postprocess of a foundry or steel casting factory comprises a diffuser(2) for delivering the external air toward the bottom surface of a workplace; several perforated plates(3) which are installed on the bottom surface of the workplace(1) so that various dusts are smoothly dropped into a dust collection chamber(4) formed on the bottom surface of the workplace(1); a filter and vibrating unit(5) which is installed on the upper part of one side of the dust collection chamber(4) to filter dust with large particles contained in the air inside the dust collection chamber(4); a dust collector(7) for collecting the dust with fine particles passing through the filter and vibrating unit(5); a screw transfer unit(8) which is installed at the lower part of the dust collection chamber(4) to transfer sand dust with relatively large particles dropped onto the bottom surface of the collection chamber(4) toward the bucket elevator(9); a bucket elevator(9) which is vertically installed between an outlet of the screw transfer unit(8) and the ground to transfer the sand dust transferred through the screw transfer unit(8) toward the disposing and retreating facility(10) on the ground in the state that the sand dust is sealed so that it is not scattered; a disposing and retreating facility(10) which is installed on the ground to dispose or retreat the collected dust by collecting dust transferred through the bucket elevator(9); and a vibrating motor which is installed on the inclined surface part of one side of the dust collection chamber(4) so that various dusts easily slide down along the inclined surface part of the dust collection chamber(4).

Description

Dry dust processing system in casting and casting steel plant

The present invention relates to a dry dust treatment system in a post-treatment process of a casting and casting steel plant, and more particularly, a metal and mineral dust, which is generated in the post-treatment work process of a casting and casting steel plant, is very harmful to workers. Air is collected from the dust collector through the filter and the vibrator, and the fine dust contained in the air is dropped into the space below through the perforated plates installed at the floor of the workplace through the air supply. By transporting the equipment and bucket elevator to the disposal and reprocessing facilities on the ground, these dusts spread to the workplace, causing deterioration and poor quality of the product, and heavy metal dust accumulated in the human body through the respiratory system. It is invented to prevent the occurrence of occupational diseases in advance.

In general, the dust generated from the repair and post-treatment work (welding, melting, grinding, etc.) of castings, castings, and steel mills includes mineral dusts, metal dusts, and harmful gases and fumes. Because it is deposited on the floor and scattered again, it spreads back to the workplace, contaminating the mechanical equipment, shortening the lifespan such as deterioration of precision, and causing the working environment to be poor.

Currently, there are about 500 castings and cast steel factories in Korea, and about 3000 workers working in the post-treatment process, and large companies have local exhaust or dust collection facilities with sufficient capacity but do not take into account the characteristics of dust. As a result, its performance is not exhibited.

In addition, most small and medium foundries do not have dust collection facilities. In large corporations, subcontracts are provided to subcontractors, or illegal workers working in this process, and the average age of existing workers is 45-55 years old. After their retirement, there is no one to continue to work in this field, which is a serious condition for the national economy.

On the other hand, the generated dust is heavy and is deposited on the floor and scattered again, and only a small part of fine dust or welding fumes are discharged through the exhaust system. Since there is no door blocking the work place and the outside and it is a factor that scatters the dust inside when a gust flows from the outside, most of the use is discontinued because it does not show its effect.

In addition, as a result of grasping the dust measurement status of the post-treatment process in the present industrial park, there are some workplaces measuring up to 9.82-24.835 mg / ㎥ (2 mg dust allowable concentration of 5 mg / ㎥). The concentration of metal chromium exceeds the allowable concentration (0.5 mg / ㎥ of metal chromium), and many workplaces exceed the dust exposure standard under the Industrial Safety and Health Act.

In other words, at present, most of the castings and cast steel plants are equipped with exhaust facilities (dust collectors) to deal with the generated dust, but the emissions are less than 10% and most of them are spread within the workplaces, making the surrounding work environment worse. The situation is also damaging to other workers.

The present invention has been devised to solve such problems in the related art, and escapes the upper or side exhaust method, which has been less than 10% of the previous discharge efficiency, and adopts the downward exhaust method for the first time to generate more than 95% of the generated dust immediately. The purpose is to provide a dry dust treatment system in the post-treatment process of foundry and cast steel plant, which can contribute to the improvement of working environment and the quality of casting products as well as to prevent occupational diseases of workers.

An object of the present invention is a diffuser which is installed on the upper surface of the closed workplace having a predetermined space area to supply the fresh air to the floor surface side; A plurality of perforated plates installed in the upper opening of the collection chamber so as to coincide with the bottom surface of the workshop so that various dusts fall smoothly into a dust collection chamber formed by digging a part of the bottom surface of the workshop deeply; A filter and a vibration device installed at one upper surface of the dust collection chamber to filter the large particles contained in the air in the dust collection chamber; A dust collecting facility for collecting fine particle dust that is sucked through the duct through the filter and the vibration device; A screw feeder installed at the bottom of the dust collecting chamber and transferring the relatively large sand dust falling to the bottom surface side of the collecting chamber to the bucket elevator side; A bucket elevator installed vertically between the discharge port of the screw feeder and the ground to transport the sand dust conveyed through the screw feeder to the waste disposal and reprocessing facility on the ground in a sealed state so as not to be scattered; A disposal and reprocessing facility installed on the ground for collecting and discarding or reprocessing dust transferred through the bucket elevator; It can be achieved by providing a vibration motor which is provided on one side of the inclined surface portion of the dust collection chamber so that various dusts slide easily.

Therefore, metal and mineral dusts, which are various harmful substances generated during the post-treatment work process of castings and castings, are collected through the dust collection chamber at the bottom of the work site by suctioning from the lower part of the work place. And the dust is sucked into the dust collection facility and the larger and heavier sand dust can be transferred to the disposal and reprocessing facility prepared on the ground through the screw type transfer device and the bucket elevator. Or, more than 95% of the dust emission effect can be obtained compared to the side exhaust method, which can contribute to the improvement of the working environment and the quality of casting products, as well as to prevent occupational diseases of workers.

1 is a block diagram of a system of the present invention.

2 is a partially enlarged cross-sectional view of a porous plate used in the system of the present invention.

Explanation of symbols on the main parts of the drawings

1: workshop 2: diffuser

3: perforated plate 4: dust collection chamber

5: filter and vibrator 6: duct

7: dust collector 8: screw feeder

9: bucket elevator 10: disposal and reprocessing facility

11: vibration motor

Hereinafter, preferred embodiments of the present invention will be described in detail by the accompanying drawings.

1 shows a schematic diagram of a system of the present invention, and FIG. 2 shows a partially enlarged cross-sectional view of a porous plate used in the system of the present invention.

According to this, the diffuser (2) which is installed toward the floor from the upper surface portion of the closed workshop (1) having a predetermined space area to supply the fresh air to the workplace when the suction operation of the dust collecting equipment (7) and ;

Several perforated plates installed in the upper opening of the collection chamber 4 so as to coincide with the bottom surface of the workshop so that various dusts fall smoothly into the dust collection chamber 4 formed by digging a part of the bottom surface of the workshop 1 deeply ( 3) and;

A filter and a vibration device (5) installed at one upper surface of the dust collecting chamber (4) to filter out the large particles contained in the air in the dust collecting chamber (5);

A dust collecting facility (7) for collecting and collecting the fine particle dust passing through the filter and the vibration device (5) through a strong suction operation through the duct (6);

A screw feeder (8) installed at the bottom of the dust collecting chamber (4) for transferring sand particles having a large particle falling to the bottom surface side of the collecting chamber to the bucket elevator (9);

It is installed vertically between the discharge port of the screw transfer device 8 and the ground and transported to the land disposal and reprocessing facility 10 side of the ground in a sealed state so as not to scatter the sand dust transferred through the screw transfer device. A giving bucket elevator 9;

A disposal and reprocessing facility (10) installed on the ground to collect and discard or reprocess dust collected through the bucket elevator (9);

It is characterized in that the vibration motor 11 is installed on one side of the inclined surface portion of the dust collecting chamber 4 to allow various dusts to slide down easily.

At this time, the partition wall 32 formed between the holes 31 of the porous plate 3 has a rhombus shape with respect to the vertical direction as shown in FIG. 3 so that the surface area of the upper surface of the porous plate 3 is as small as possible. Therefore, various harmful dusts falling to the upper surface of the porous plate 3 do not accumulate in the plane 34 above the partition 32 of the porous plate 3, but mostly through the holes 31 (that is, with the relatively wide inlet 33). Through the narrow hole 35) immediately into the dust collection chamber 4;

Therefore, it is possible to improve the fluidity of the air by minimizing the opening area, and to increase the flow velocity by preventing the formation of turbulence.

On the other hand, a dry dust treatment system such as the device of the present invention is preferably adopted to facilitate the regeneration of sand in the workplace where degassing is not completely or waste water treatment is difficult, and dust on the entire floor surface to have a sufficient space below the floor surface in general It is more effective to form the collecting chamber 4 and to install the porous plate 3 over the entire opening (that is, the entire bottom surface).

The operational effects of the system of the present invention configured as described above are as follows.

First, since the diffuser 2 is installed on the upper surface of the closed workshop 1 having a predetermined space area toward the bottom surface, when the dust collecting facility 7 is operated to perform forced suction, external fresh air is always supplied to the diffuser. Because of the forced suction into the workplace (that is, because the flow layer of air from the top to the bottom is formed), various dusts generated in the workplace and free-falling by gravity are accelerated by the external air supplied through the diffuser (2). In the state that is attached to the perforated plate (3) which is installed on the bottom surface all fall.

At this time, the opening of the dust collecting chamber 4 formed by digging a part of the bottom surface of the workshop 1 deep, that is, the several porous plates 3 installed on the bottom surface of the workshop, have respective holes 31, that is, upwards. The partition wall 32 formed between the holes 31 having a wide inlet 33 and a middle hole 35 having a narrow shape has a cross-sectional area having a rhombus shape with respect to the vertical direction (that is, the upper plane 34 Has a very narrow rhombus-shaped partition wall 32). The inlet 33 of the holes 31 is maximized and the plane 34 of the partition wall 32 is minimized to create turbulence in the flow of air. Air flow velocity can be increased by reducing the size of the passage hole 35, and the various harmful dusts falling to the upper surface of the porous plate 3 by free fall and forced suction of the dust collecting equipment 7 are Most of the holes 31 are immediately opened without accumulating on the upper surface of the trial plate 3. It is falling into the dust collecting chamber (4).

That is, the porous plate 3 has a cross section having a rhombus shape in the vertical direction between the partition walls 32 formed between the holes 31, so that the air flows well and the formation of turbulence does not occur. Since the flow velocity is increased, various harmful dusts do not accumulate on the upper surface of the porous plate 3, and most of them immediately fall to the dust collection chamber 4, and also serve to prevent work pieces or relatively large pieces from falling to the floor.

Of course, the impact force applied when the worker walks also acts in part, even though some dust is accumulated in the upper surface 34 of the partition plate 32 of the porous plate 3. It is slid sideways to be sucked into the dust collection chamber 4, which is a space formed below the inlet 33 and the hole 35 (i.e., through the hole 31).

At this time, the dust collection chamber 4 is preferably formed in the form of a hopper to collect all the dust fall to one side to the outside, the vibration motor 11 is installed on one side of the dust collection chamber (4). Therefore, it is good to prevent dusts from accumulating on the slope and not falling well.

On the other hand, one side of the upper surface of the dust collection chamber (4) formed at the bottom of the work floor (1) so as to have a predetermined volume of space is provided with a filter and a vibration device (5) is contained in the air in the dust collection chamber Particles having relatively large particles among various dusts are filtered by the operation of the filter and the vibrator 5, and only the fine particle dust passing through the filter is sucked and collected by the dust collecting facility 7 through the duct 6, and then collected separately. It is discarded through the treatment of.

At this time, the vibrator 5 serves to shake off the dust adsorbed to the filter from time to time to extend the replacement cycle of the filter, and if a lot of dust is caught on the filter itself, the filter itself may be replaced with a new one.

In addition, a screw feeder 8 is installed at one side of the bottom of the dust collecting chamber 4, and a bucket elevator 9 is vertically installed between the outlet of the screw feeder 8 and the ground. Therefore, the relatively large particles of sand dust collected toward the bottom surface side of the dust collection chamber 4 are not scattered through the screw transfer device 8 and the bucket elevator 9 and are disposed of on the ground in a closed state. It is conveyed to the treatment facility 10 for subsequent disposal or reprocessing.

In this way, through the suction operation of the dust collecting facility 7, the fresh air is blown downwards from the upper part of the workplace (Push), so that the dust discharge effect of 90-95% can be obtained only by the existing dust collecting capacity. In particular, this treatment is particularly suitable for post-treatment of products with complex shapes that do not completely degas during the entire process.

As described above, according to the present invention, the dust treatment method up to now has been treated by taking the top discharge or side discharge method as mentioned above, but the effect is very weak, so the present invention discharges to the bottom bottom. By adopting the following effects can be obtained.

First, it is possible to prevent dust spreading to surrounding workplaces at the source to improve product quality, prevent defects, and to extend the life of equipment. Break away from the image of the workplace and create jobs for workers to return to, and free from the heavy armor that workers wear for the third time. It is possible to wear lightweight protective equipment, to prevent occupational diseases of workers (lung cancer), to improve industrial health and hygiene environment of surrounding workers, and to collect waste of metal dust, which can contribute to recycling of resources. It works.

Claims (2)

It is installed from the upper part of the closed work place 1 having a predetermined space toward the floor, and when the dust collecting facility 7 is inhaled, the fresh air is supplied into the work place to accelerate the free fall due to gravity. A diffuser (2) to give; Several perforated plates installed in the upper opening of the collection chamber 4 so as to coincide with the bottom surface of the workshop so that various dusts fall smoothly into the dust collection chamber 4 formed by digging a part of the bottom surface of the workshop 1 deeply ( 3) and; A filter and a vibration device (5) installed at one upper surface of the dust collecting chamber (4) to filter out the large particles contained in the air in the dust collecting chamber (5); A dust collecting facility (7) for collecting and collecting the fine particle dust passing through the filter and the vibration device (5) through a strong suction operation through the duct (6); A screw feeder (8) installed at the bottom of the dust collecting chamber (4) and conveying to the bucket elevator (9) side in a sealed state so as not to scatter relatively large sand dust falling to the bottom surface side of the collecting chamber; ; A bucket elevator 9 installed vertically between the discharge port of the screw feeder 8 and the ground to transfer sand dust, etc. transferred through the screw feeder to the land disposal and reprocessing facility 10 on the ground; ; A disposal and reprocessing facility (10) installed on the ground to collect and discard or reprocess dust collected through the bucket elevator (9); In the post-treatment process of the casting, cast steel factory characterized in that the dust collection chamber (4) is installed on one side of the inclined surface configured to vibrate motor 11 so that various dusts easily slide down from the inclined surface of the dust collection chamber Dry Dust Treatment System. The method according to claim 1, The partition wall 32 of the porous plate 3 has a very narrow lozenge shape in the upper plane 34 portion, and the hole 31 formed between the partition walls 32 has an inlet 33 at the edge of the partition walls 32. Dry dust treatment system in the after-treatment process of castings, castings and steel mills, which is formed to be wider than the holes 35 formed between the parts, so that the flow of air is good, the formation of turbulence can be prevented, and the flow rate is increased. .