JPS6140360Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is used for a dust collector for collecting fumes generated during arc welding, etc., and is particularly applicable to combustible fumes generated during welding using a carbon dioxide welding machine. The present invention relates to a cleaning device for a dust collection electrode that is designed to reliably clean the dust collection electrode in order to prevent the ignition of dust fumes.

Huyum is a metal oxide fine powder that is formed by evaporating metal at high temperatures and turning it into gas, which after cooling condenses into fine particles of about 0.1 μm. Since it is harmful to the human body, it is collected to improve the working environment. Various collection methods have been developed, but as mentioned above, the particles of fume are too fine, and at the same time, the amount of fume generated is particularly large during cutting operations, so collection and separation, that is, dust collection, is extremely difficult. It's troublesome dust.

Generally, dust is collected using baggage filters, but if the above-mentioned fumes are collected only with baggage filters, the filtration speed must be designed to be extremely slow, and therefore, it is necessary to design the filtration speed to be extremely slow compared to the air volume. Therefore, there is a problem in that the dust collector must be made larger than necessary. Furthermore, the current practice is to attach powder as a filter aid to the bag filter mentioned above and allow the filter aid to collect the fume, but while this method has an excellent collection effect, it , the amount of filter aid used is large, and its handling is very troublesome.

Therefore, as a dust collector exclusively for the above-mentioned fumes, we have developed an electrostatic coagulation type dust collector that charges fine fumes with static electricity and aggregates them, and collects them with a bag filter, and a dust collector that attaches and collects fine fumes to a dust collection electrode. Electrostatic dust collectors have been developed that periodically brush off the fumes and collect them in a bag filter, but these dust collectors regularly and reliably remove the fumes attached to the electrodes. need to be cleaned.

In other words, in the case of the above-mentioned electrostatic precipitator, most of the suctioned fume is collected on the electrode part and is agglomerated before being sucked into the bag filter. In this case, the amount of fume attached to the electrode is smaller than that of the electrostatic precipitator, but in both types of dust collectors, fume adheres and accumulates on the discharge electrode and the dust collector. When a large amount of fume accumulates on each electrode, a spark discharge is generated to ignite the easily flammable metal fume, and if this is sucked into the bag filter, there is a risk that the bag filter will burn. Therefore, in the case of the above-mentioned dust collector, it is necessary to stop dust collection once every few hours and clean the fume deposited on the electrodes to eliminate the risk of combustion. However, cleaning the electrodes is cumbersome and easy to neglect, with people often forgetting to clean them due to busy schedules, or not cleaning them thoroughly even after stopping the dust collection operation.There was a need for a solution to this problem. .

Therefore, in view of the above-mentioned points, the present invention has been developed to make it possible to clean the electrodes with an extremely simple operation, and to oblige workers to clean the electrodes once every few hours by running the suction operation of the dust collector. We provide a cleaning device for dust collecting electrodes that is devised so that once the dust collector has stopped, the dust collector cannot be restarted unless the operator activates a dust remover consisting of a brush or the like to thoroughly clean the electrodes. An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In explaining the embodiments of the present invention, it is important to note that the electrostatic coagulation type and electrostatic precipitator type dust collectors have the same structure in principle, and the present invention can be implemented with exactly the same configuration. The following explanation will be made only regarding the electrostatic precipitator type dust collector, and the explanation of the electrostatic coagulation type dust collector will be omitted.

1 and 2 are a front view and a side view of an electrostatic precipitator according to the present invention, in which the reference numeral 1 in the figures indicates an electrode part 2 inside, and The primary dust collection chamber (electrostatic precipitator) with a suction port 1a opened on the upper side is also designated by the symbol 3.
The interior is divided into two upper and lower chambers, a clean side and a dust side, and the clean side is equipped with a motor 5 equipped with a suction fan 4, and the dust side is equipped with a secondary dust collection chamber (with multiple bag filters 6...). The electrostatic dust collector described above is constructed by connecting the primary dust collection chamber 1 to the front stage of the secondary dust collection chamber 3 so that the suction action of the suction fan 4 can be applied. Ru. In addition, although the primary dust collection chamber 1 is directly fixed to the side surface of the secondary dust collection chamber 3 in the drawing, the two may be separated and connected by a duct or the like.

In the dust collector configured as described above, when the motor 5 is started and the fan 4 is rotated, the fume sent from the dust source passes through the suction port 1a and enters the primary dust collection chamber 1.
After being sucked into the dust collector and rectified by the rectifying plate 1b, it is charged by the electrode part 2, aggregated and coarsened, and then sucked into the secondary dust collection chamber 3 and collected by the bag filter 6... It has become. Further, in the drawing, 7 is a handle for removing dust from the bag filter 6, and when this handle 7 is rotated, a dust removing member 8 installed in the secondary dust collection chamber 3 is removed from the bag filter 6.
The fume attached to the surface can be brushed off into the bucket 9.

3 to 5 are enlarged views explaining the primary dust collection chamber 1 in detail, and 10 is a door for inspecting the electrodes attached to the front of the dust collection chamber 1 so as to be openable and closable. The section 2 is provided just inside this door 10. The electrode part 2 is shown in FIGS. 4 and 5.
As shown in the enlarged cross-sectional view shown in the figure, there are a plurality of dust collecting electrodes 2a arranged in parallel at equal intervals, and each of these dust collecting electrodes 2a.
It is composed of a plurality of discharge electrodes (discharge wires) 2b stretched within each interval of... and insulators 2c attached to both ends of each discharge electrode 2b.

The cleaning device of the present invention for cleaning the fume adhering to and accumulating on the electrode section 2 configured as described above has a rotating shaft 1 rotatably installed horizontally on the inner bottom side of the primary dust collection chamber 1.
1a, a scraping tool 11b such as a brush attached to this rotating shaft 11a, and an operation handle 11d with a lever 11c attached to the outer end of the rotating shaft 11a.
A dust remover 11 and a primary dust collection chamber 1 constituted by
It is attached to the front of the above operating handle 1.
It is composed of a first switch 12 and a second switch 13 that are opened and closed by a rotational operation of 1d.

Among the above switches, the first switch 12 is always pressed and closed by the operating handle 11d, which is stopped at the lowered position as shown in FIGS. 2 and 3. The third
This is a limit switch configured to automatically open when rotated in the direction of the imaginary line in the figure.
The second switch 13 is normally open, but when the operating handle 11d is rotated to the upper limit position where each scraping tool 11b has completely cleaned the electrode section 2, the operating handle 11d is pressed. These switches 12 and 13 are limit switches that close when the motor 5 is stopped and the dust collection operation is stopped, and then the first switch 12 is opened by turning the operation handle 11d. 2nd switch 1
After closing step 3, press the operating handle 11d again.
If the second switch 13 is not opened again and the first switch 12 is closed again by re-operating, the secondary dust collection chamber 3 will be closed.
The fan motor 5 is connected in parallel to the power supply circuit of the motor 5 so that the fan motor 5 cannot be restarted even if a start switch 14 provided on the front side of the fan motor 5 is pressed. still,
In FIGS. 2 and 3, 15 and 16 are a cleaning indicator light and a high pressure indicator light provided at the front of the upper part of the primary dust collection chamber 1, and the cleaning indicator light 15 is provided at the front of the secondary dust collection chamber 3. When the off switch 17 for stopping the electric dust collector is pressed down, the light turns on, and when the operating handle 11d is rotated to close the second switch 13, the light is turned off.Furthermore, the high voltage indicator light 16 indicates that the high voltage power supply of the electric dust collector is turned off. It lights up when it is operating normally, but
If there is an abnormality in the high voltage power supply and high voltage is not generated and fume accumulates on the electrodes and spark discharge occurs, the light goes out and indicates a high voltage abnormality. In addition, the above dust remover 1
Cleaning the electrode part 2 in step 1 usually takes 10 hours or more for fume to accumulate in a dangerous state if the electrode part 2 is large enough, so cleaning it once every few hours will eliminate the danger of combustion. There is no gender.

Next, an example of the operation of the power supply circuit for the fan motor 5 incorporating the first and second switches 12 and 13 will be described with reference to FIG.

When starting the operation of the dust collector, hold the lever 11c and rotate the operating handle 11d in the direction of the arrow in FIGS. 2 and 3 to clean the electrode section 2, and at the same time, turn on the second switch 13 at the upper limit position. If so, relay 1 connected in series to this switch 13
8 is activated and the first relay switch 18-1 is closed, so the relay 18 is self-held, and at the same time, the second relay switch 18-2 connected in series to the cleaning indicator light 15 is opened and the indicator light is turned off. 15 goes out. Next, when the operating handle 11d is returned to its original position (lowered position), the first switch 12 is turned on again, and at the same time, the door 10 is completely closed and the door switch 19 connected in series to this switch 12 is turned on. In this case, the third relay 18 connected in series to this door switch 19
Since the relay switch 18-3 is already turned on when the relay 18 is activated, when the start switch 14 is turned on, the third relay switch 18-3 is turned on.
The self-holding switch 20-1 and the switch 20-2 connected to the fan motor 5 are turned on by the electromagnetic contactor 20 connected to the fan motor 5, so the fan motor 5 starts and starts collecting dust.

After several hours of operation, when the normally closed off switch 17 is pressed to turn off the power, the relay 18 and the electromagnetic contactor 20 are released and at the same time the cleaning indicator light 15 lights up, and the above operation is completely repeated again. If the electrode section 2 is not cleaned, the fan motor 5 will not be restarted even if the start switch 14 is pressed halfway.

Since the present invention has the above-described configuration, the electrode part can be cleaned very easily using a dust remover, and the fume adhering to the electrode part can be removed, thereby preventing combustion accidents caused by the accumulation of fume. This can be prevented in advance, but in this invention, in particular,
For fans that have stopped even after pressing the start switch, you must turn the operating handle to clean the electrode part with a brush, etc., turn on the second switch, return the operating handle and turn on the first switch. Since it is not possible to restart the motor to perform dust collection operation, the electrode section is forced to be cleaned every time dust collection operation is stopped to prevent fume build-up and prevent combustion due to neglect of cleaning. Accidents can be eliminated. Furthermore, in this invention, the first and second switches are installed in the front of the primary dust collection chamber, and these switches can be operated directly with the operating handle of the dust remover.
Since the switch is configured to turn on and off, it has the advantage of being able to perform the above-mentioned functions accurately, and maintenance and inspection of each switch can be performed extremely easily.Although the configuration is simple, , it is very beneficial to implement it in the electrostatic precipitator type dust collector or electrostatic coagulation type dust collector shown in the figure.

[Brief explanation of the drawing]

The drawings are all examples of the present invention, and Fig. 1 is a front view of a dust collector equipped with the present invention, Fig. 2 is a side view thereof, and Fig. 3 is an enlarged front view of the primary dust collection chamber. , FIG. 4 is a sectional view taken along line A-A in FIG. 3, FIG. 5 is a sectional view taken along line B-B in FIG. . DESCRIPTION OF SYMBOLS 1... Primary dust collection chamber, 2... Electrode section, 3... Secondary dust collection chamber, 4... Suction fan, 5... Fan motor, 6... Buzz filter, 11... Dust remover, 11d ...Operation handle, 12...First switch, 13...Second switch, 14...Start switch, 18...Relay, 18-3...Relay switch.

Claims (1)

[Scope of utility model registration request] A secondary dust collection chamber equipped with a suction fan and a filter that collects the agglomerated fume dust is connected to the rear stage of the primary dust collection chamber, which is equipped with an electrode that attaches and electrostatically aggregates the fine fume dust that has been sucked in. In this dust collector, a dust remover is installed inside the primary dust collection chamber to remove fume dust adhering to the electrodes, and this dust remover can be operated freely by an operating handle provided outside the primary dust collection chamber. and a normally open first switch that is pressed by the operating handle to maintain a closed state at all times and is released when the operating handle is activated to remove dust;
A second switch is provided, which is closed by being pushed by the operation handle when dust removal is activated to the upper limit position.
Each of the second switches is connected in parallel to the power supply circuit of the motor that drives the fan, and
A relay that is activated when the second switch is closed is connected in series to the switch, and a relay switch that is activated when the second switch is activated is connected to the first switch, and a starting switch for the fan motor is connected to the first switch. A cleaning device for dust collecting electrodes, characterized in that the electrodes are connected in series.