Dust collection system and notification system

Abstract

To provide a technique that can output volume of dust removed from a filter.SOLUTION: A dust collection system comprises: a first air chamber having an intake port into which ambient air is introduced; a filter which is located in the first air chamber, separates dusts from air in the first air chamber, and permits air to pass therethrough; a second air chamber having an introduction part into which air passed the filter is introduced, and an exhaust port which communicates with the outside of a device; an air blower which is located in the second air chamber, generates an air flow to the exhaust port, and feeds ambient air into the first air chamber from the intake port; a removal device which is located in the second air chamber, and removes dusts adhered to the filter; a box which is located in the first air chamber, and accommodates dusts removed from the filter; a sensor which detects a differential pressure between the first air chamber and the second air chamber; and a control part which inputs a detection result of the sensor. The control part outputs information concerning volume of dusts removed from the filter on the basis of change in the differential pressure before and after such operation that the removal device removes dusts adhered to the filter.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a dust collection system and an alarm system. [Background technology]

[0002] Patent Document 1 discloses a dust collector. The dust collector is equipped with a filter disposed in a dust collection chamber for capturing dust in the air, an air injection mechanism for blowing off the dust captured by the filter with air, a dust box for receiving the dust that is blown off into a bucket chamber, and a lift mechanism disposed at the bottom of the bucket chamber for pushing up the dust box and pressing it against the underside of the dust collection chamber. The lift mechanism has an airbag that is inflated by air. When a pressure detector for detecting internal pressure fluctuations in the airbag detects a predetermined level of internal pressure fluctuation, a dust removal command is issued from the dust collector to remove the dust box. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-51527 Summary of the Invention [Problem to be solved by the invention]

[0004] In the device described in Patent Document 1, there is a risk that the dust removal command may not be issued at the appropriate time. For example, in the case of a small-sized dust collector, the capacity of the dust box is small, so there is a risk that the pressure fluctuations inside the airbag may not be accurately obtained. This disclosure provides a technology that can appropriately output the volume of dust removed from the filter. [Means for solving the problem]

[0005] A dust collection system according to one aspect of the present disclosure comprises a first air chamber having an intake port through which outside air is introduced, a filter disposed in the first air chamber that separates dust from the air in the first air chamber and allows the air to pass, a second air chamber having an intake port through which air that has passed through the filter is introduced and an exhaust port that communicates with the outside of the device, a blower disposed in the second air chamber that generates an airflow to the exhaust port and sends outside air from the intake port to the first air chamber, a dust removal device disposed in the second air chamber that removes dust adhering to the filter, a box disposed in the first air chamber that collects the dust removed from the filter, a sensor that detects the differential pressure between the first air chamber and the second air chamber, and a control unit that inputs the detection results of the sensor, and the control unit outputs information regarding the volume of dust removed from the filter based on the change in the differential pressure before and after the dust removal device operates to remove dust adhering to the filter.

[0006] Another aspect of the present disclosure provides an alarm system connected to a dust collector that passes air through a first air chamber, a filter, and a second air chamber in that order to separate dust particles in the air into the filter, and includes a sensor that detects the differential pressure between the first air chamber and the second air chamber, and a control unit that inputs the detection results of the sensor.The control unit obtains the change in differential pressure before and after the dust collector operates to brush off dust particles adhering to the filter, and outputs information regarding the volume of dust brushed off the filter based on the change in differential pressure. [Effects of the Invention]

[0007] According to the present disclosure, the volume of dust removed from the filter can be appropriately output. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing an outline of a dust collection system according to one embodiment. [Figure 2] FIG. 2 is a block diagram showing an outline of the dust collection system shown in FIG. [Figure 3] FIG. 3 is a flowchart illustrating the operation of the dust collection system. [Figure 4]FIG. 4 is a flowchart illustrating the operation of the dust collection system. [Figure 5] FIG. 5 is a flowchart illustrating the operation of the dust collection system. [Figure 6] FIG. 6 is a block diagram showing an outline of a dust collection system according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the description of the drawings, the same elements are given the same reference numerals, and duplicate descriptions will be omitted. The dimensional ratios of the drawings do not necessarily match those in the description. The terms "upper," "lower," "left," and "right" are based on the illustrated state and are for convenience only.

[0010] [Dust collection system configuration] A dust collection system according to one embodiment is installed in, for example, a factory to collect dust in the air. Dust is a powder that is fine enough to float in the air, and includes fumes generated during laser processing, plasma processing, welding, and the like.

[0011] FIG. 1 is a cross-sectional view showing an overview of a dust collection system according to one embodiment. In the figure, the X and Y directions are horizontal directions, and the Z direction is vertical. Hereinafter, the Z direction will also be referred to as the up-down direction. As shown in FIG. 1, the dust collection system 2 includes a dust collector 1. The dust collector 1 includes a housing 10. The housing 10 introduces outside air into the interior through an intake port 10a. An intake duct 11 is provided at the intake port 10a. The housing 10 exhausts the air from which dust has been removed to the outside of the device through an exhaust port 10b. An exhaust duct 12 is provided at the exhaust port 10b.

[0012] The internal space of the housing 10 is divided by the first partition plate 15 into a dust chamber S1 (an example of a first air chamber) which is the space below the first partition plate 15, and a clean air chamber S2 (an example of a second air chamber) which is the space above the first partition plate 15. The periphery of the first partition plate 15 is connected to the inner wall surface of the housing 10 in an airtight manner.

[0013] The dust chamber S1 is a chamber into which air to be collected is supplied. The dust chamber S1 is in communication with the outside of the device via an air intake 10a. A filter 20 is housed in the dust chamber S1. The filter 20 separates dust from the air in the dust chamber S1 and allows the air to pass through. The filter 20 has a cylindrical body made of a material such as paper or cloth. The upper end of the filter 20 is airtightly connected to an inlet 15a formed in the first partition plate 15. As a result, the filter 20 is disposed in the dust chamber S1 so as to hang down from the first partition plate 15. The outer peripheral surface of the filter 20 body faces the dust chamber S1, and the internal space of the body is in communication with the clean air chamber S2.

[0014] The clean air chamber S2 is a chamber to which dust-free air is supplied. The clean air chamber S2 houses a blower 30. The blower 30 is, for example, a blower and includes an impeller blade 30a and a motor 30b. The blower 30 generates an airflow in the clean air chamber S2 toward the exhaust port 10b. This creates a negative pressure in the dust chamber S1, and outside air is sent into the dust chamber S1 through the intake port 10a of the dust chamber S1.

[0015] That is, when the impeller blades 30a are rotated by the motor 30b, outside air containing dust is introduced into the dust chamber S1 via the intake duct 11 and the intake port 10a. The dust-containing air passes from the outer peripheral surface of the filter 20 to the inner peripheral surface of the filter 20, where it is separated into air and dust. The air from which the dust has been removed (clean air) passes from the internal space of the filter 20 through the blower 30, and is discharged outside the dust collector 1 through the exhaust port 10b and the exhaust duct 12. In this way, the dust collector 1 separates the dust in the air into the filter 20 by passing the air through the dust chamber S1, the filter 20, and the clean air chamber S2 in that order.

[0016] The clean air chamber S2 may be further divided by a second partition plate 16 into a decompression chamber S21, which is the space below the second partition plate 16, and an exhaust chamber S22, which is the space above the second partition plate 16. The periphery of the second partition plate 16 is airtightly connected to the inner wall surface of the housing 10. The second partition plate 16 is provided with an opening 16a for airtight connection to the blower 30. The decompression chamber S21 communicates with the dust chamber S1 via an inlet 15a. The exhaust chamber S22 communicates with the decompression chamber S21 via the blower 30 and has an exhaust port 10b. The blower 30 is airtightly provided in the opening 16a. The blower 30 creates a negative pressure in the decompression chamber S21 by blowing air from the decompression chamber S21 to the exhaust chamber S22. As a result, the dust chamber S1 communicating with the decompression chamber S21 also becomes negative pressure, and outside air is sent into the dust chamber S1 through the intake port 10a.

[0017] A dust removal device 31 is disposed in the clean air chamber S2. The dust removal device 31 is disposed in the decompression chamber S21, for example. The dust removal device 31 removes dust adhering mainly to the outer peripheral surface of the filter 20 by blowing compressed air into the filter 20 in pulses. This restores the filtering function of the filter 20.

[0018] In the dust chamber S1, a dust box 21 (an example of a box) is arranged below the filter 20. The dust box 21 is a box body with an open top, and stores dust D that falls from the filter 20. A plurality of dust boxes 21 may be arranged as shown in FIG. 1, or only one dust box 21 may be arranged.

[0019] The bottom surface of each dust box 21 is supported by a lift-up mechanism. The lift-up mechanism pushes the dust box 21 upward. The upper end of the dust box 21 is pressed against and fixed to the bottom 22 of the dust chamber S1. This airtightly connects the bottom 22 of the dust chamber S1 and the dust box 21. The lift-up mechanism is, for example, an air cylinder 23 or a jack 24. The lift-up mechanism may also be an air bag.

[0020] The dust collector 1 is provided with a sensor 32 that detects the differential pressure between the dust chamber S1 and the clean air chamber S2. The sensor 32 is a pressure sensor that outputs a detection signal according to the differential pressure. The sensor 32 has detection terminals located in both the dust chamber S1 and the clean air chamber S2, and detects the differential pressure between the dust chamber S1 and the clean air chamber S2.

[0021] A controller 36 (an example of a control unit) is provided in the clean air chamber S2. The controller 36 is a control unit that performs overall control of the dust collector 1. The controller 36 is configured as, for example, a programmable logic controller (PLC). The controller 36 may be configured as a computer system including a processor such as a central processing unit (CPU), memories such as random access memory (RAM) and read only memory (ROM), input / output devices such as a touch panel, mouse, keyboard, and display, and a communication device such as a network card. The controller 36 operates each component of the dust collector 1 under the control of the processor based on a computer program stored in the memory.

[0022] Fig. 2 is a block diagram showing an overview of the dust collection system shown in Fig. 1. As shown in Fig. 2, a controller 36 is connected to the blower 30 and the dust-scrubbing device 31 and controls the operations of the blower 30 and the dust-scrubbing device 31. The controller 36 outputs a signal to the motor 30b of the blower 30 to control the rotation of the impeller blades 30a. The controller 36 outputs a signal to the dust-scrubbing device 31 to cause the dust-scrubbing device 31 to blow compressed air into the inside of the filter 20 in pulses.

[0023] The controller 36 activates the dust removal device 31 when a predetermined dust removal condition is met. For example, the predetermined dust removal condition is met when a predetermined time has elapsed since the previous activation. In this case, the dust removal device 31 operates at predetermined time intervals to periodically remove dust adhering to the filter 20. Note that the initial activation may be performed when the dust collector 1 is started. The predetermined dust removal condition may be related to the detection result of the sensor 32. The controller 36 is connected to the sensor 32 and inputs the detection result of the sensor 32. If the differential pressure detected by the sensor 32 is equal to or greater than a predetermined value, the controller 36 determines that the filter 20 is clogged and activates the dust removal device 31. The predetermined value is set in advance depending on the type of dust, the environment surrounding the dust collector 1, and the like. By monitoring the clogged filter 20 based on the differential pressure, the controller 36 can restore the function of the filter 20 more quickly than when the dust removal device 31 is activated periodically. Furthermore, the controller 36 can contribute to CO2 reduction by using compressed air more efficiently.

[0024] The controller 36 can output the detection result of the sensor 32 to a display device 37 and an audio device 38. The display device 37 is a device capable of displaying information, such as a display. The display device 37 is disposed on the outer surface of the housing 10 of the dust collector 1, for example, as shown in FIG. 1. The audio device 38 is a device capable of outputting audio. The display device 37 and the audio device 38 allow an operator to recognize the detection result of the sensor 32.

[0025] The controller 36 can output the detection results of the sensor 32 to a memory inside the controller 36 or a separately provided storage device 39. The storage device 39 is a memory, a hard disk drive (HHD), or the like. By storing the detection results of the sensor 32, information on the differential pressure over time can be obtained.

[0026] The controller 36 can output the detection result of the sensor 32 to the communication device 40. The communication device 40 is a device that establishes short-range communication, wireless communication, and / or wired communication. As a result, the detection result of the sensor 32 is output to an external server or a cloud computing system. The controller 36 may output the detection result of the sensor 32 to the outside via an external interface (not shown).

[0027] The controller 36 outputs information about the volume of dust brushed off the filter 20, based on a change in the pressure difference before and after the operation of the brushing device 31 to brush off the dust adhering to the filter 20. The controller 36 can determine the timing (operation timing) of the operation of the brushing device 31 to brush off the dust adhering to the filter 20, based on a control signal for the brushing device 31 output by the controller 36 itself. The controller 36 may receive an operation signal for the brushing device 31, and determine the operation timing of the brushing device 31 based on the operation signal.

[0028] The controller 36 acquires the differential pressure before and after the activation of the scrubbing device 31 from the storage device 39 or the like. For example, the controller 36 acquires a first differential pressure acquired during a predetermined period before the activation of the scrubbing device 31 and a second differential pressure acquired during a predetermined period after the activation of the scrubbing device 31. The predetermined period can be set as appropriate, for example, to about several seconds. The controller 36 then subtracts the second differential pressure from the first differential pressure to calculate the change in the differential pressure before and after the activation of the scrubbing device 31.

[0029] The change in the differential pressure before and after the operation of the dust-removal device 31 is caused by a change in the degree of clogging of the filter 20. In other words, the change in the differential pressure correlates with the weight of the dust removed by the dust-removal device 31. The weight of the dust correlates with the volume (capacity) of the dust. Therefore, the controller 36 can output information about the volume of dust removed by the dust-removal device 31 based on the change in the differential pressure. The information about the dust volume may be the dust volume value itself, or may be a representation of the dust volume in text or graphics (including graphs). "Output" includes displaying the information as an image on the display device 37, outputting it as sound from the audio device 38, and transferring it as data to the storage device 39 or the communication device 40.

[0030] The controller 36 may calculate the volume (capacity) of the dust by dividing the weight of the dust by the apparent specific gravity of the dust. The controller 36 outputs information about the volume of dust brushed off by the brushing device 31 based on the change in differential pressure and the apparent specific gravity of the dust. The apparent specific gravity of dust varies depending on the environment. The dust collector 1 may be configured to accept an input operation of the apparent specific gravity of dust by an operator, for example, via a touch panel.

[0031] The controller 36 may adjust the calculated dust volume (capacity). For example, the controller 36 may compare a calculated value obtained by dividing the change in differential pressure by the apparent specific gravity of the dust with a reference value obtained by simulation or actual measurement, and use a coefficient that makes the calculated value the reference value. In this case, the controller 36 can output a more accurate dust volume (capacity).

[0032] The controller 36 outputs information regarding the amount of dust stored in the dust box 21 based on information regarding the volume of dust brushed off the filter 20 and the capacity of the dust box 21. The controller 36 calculates and accumulates the volume of dust brushed off the filter 20 each time the dust brushing device 31 is activated. The controller 36 outputs information regarding the amount of dust stored in the dust box 21 based on the accumulated value of the dust volume and the capacity of the dust box 21. The information regarding the amount of dust stored in the dust box 21 may be the amount of dust stored in the dust box 21 itself, the percentage of the amount of dust stored in the dust box 21 relative to the entire amount of dust stored in the dust box 21, or the amount of dust that can be stored in the dust box 21. The information regarding the amount of dust stored in the dust box 21 may be expressed as numbers, letters, or graphics (including graphs). For example, the information regarding the amount of dust stored in the dust box 21 may be displayed using a meter with an upper limit of 100% of the storage capacity.

[0033] The information regarding the amount of dust stored in the dust box 21 may be a notification urging the worker to remove the dust box 21 from the dust collector 1 and discharge the dust from the dust box 21. When the amount of dust stored in the dust box 21 is equal to or greater than a predetermined value, the controller 36 outputs a notification urging the worker to discharge the dust. Such a notification may be realized, for example, by text, graphics, images, video, or audio. By receiving the notification, the worker can remove the dust box 21 from the dust collector 1 at the appropriate time and discharge the dust.

[0034] The output of information regarding the volume of dust brushed off the filter 20 and information regarding the amount of dust stored in the dust box 21 can be achieved with the sensor 32 and some functions of the controller 36. The part of the function of the controller 36 is a function that inputs the detection result of the sensor 32 and outputs information regarding the volume of dust brushed off the filter 20 based on a change in the differential pressure before and after the operation of the brushing device 31 to brush off the dust adhering to the filter 20. Therefore, the part of the function of the sensor 32 and the controller 36 constitutes the alarm system 3. The alarm system 3 may be provided in a form that is incorporated into the dust collector 1, or may be provided as a system that is added to an existing dust collector 1.

[0035] [Dust collection system operation] Fig. 3 is a flowchart illustrating the operation of the dust collection system. The flowchart shown in Fig. 3 is repeatedly executed from the timing when the dust collector 1 is powered on. As shown in Fig. 3, the controller 36 of the dust collection system 2 determines whether or not the shake-off condition is satisfied as a determination process (step S10). The controller 36 determines that the shake-off condition is satisfied, for example, when a predetermined time has elapsed since the previous operation.

[0036] If it is determined that the dust-removal condition is met (step S10: YES), the controller 36 performs a dust-removal process (step S12) by activating the dust-removal device 31. As a result, compressed air is blown into the filter 20, and the dust is removed.

[0037] Next, the controller 36 outputs the dust volume as a volume output process (step S14). The controller 36 calculates the change in the differential pressure between the dust chamber S1 and the clean air chamber S2 before and after the operation timing of the brushing device 31. The controller 36 then divides the change in differential pressure by the apparent specific gravity of the dust, multiplies it by an adjustment coefficient, and outputs the dust volume.

[0038] Next, the controller 36 outputs an accumulated value obtained by accumulating the dust volumes output in step S14 as an accumulated value output process (step S16).

[0039] Next, in a storage amount output process (step S18), the controller 36 outputs the storage amount in the dust box 21. The controller 36 outputs the storage amount in the dust box 21 based on the cumulative value obtained in step S16.

[0040] When the storage amount output process (step S18) is completed, or when it is determined that the shake-off condition is not satisfied (step S10: NO), the flowchart shown in Fig. 3 ends. When the flowchart ends, the process continues from the start of the flowchart until a predetermined termination condition is satisfied. The predetermined termination condition is, for example, turning off the power of the dust collector 1.

[0041] 3 is executed, the volume of dust shaken off from the filter 20 is appropriately output. The shake-off process may also be performed after the blower 30 has stopped when the dust collector 1 is powered off. Below, an overview will be given of the shake-off process performed after the blower 30 has stopped and the appropriate output of the volume of dust shaken off.

[0042] Figures 4 and 5 are flowcharts illustrating the operation of the dust collection system. The flowchart shown in Figure 4 shows the operation when the power of the dust collector 1 is OFF, and the flowchart shown in Figure 5 shows the operation when the power of the dust collector 1 is ON. As shown in Figure 4, first, the controller 36 of the dust collection system 2 determines whether or not a stop instruction from an operator has been received as a stop determination process (step S20).

[0043] If it is determined that the stop instruction has been received (step S20: YES), the controller 36 stores the differential pressure, which is the detection result of the sensor 32, in the storage device 39 or the like as a storage process (step S22).

[0044] Next, the controller 36 performs an air blowing stop process (step S24) to stop the air blower 30. The air blower 30 stops blowing air.

[0045] Next, the controller 36 operates the dust removal device 31 as a dust removal process (step S26), whereby compressed air is blown into the filter 20, and the dust is removed.

[0046] Next, the controller 36 turns off the power to the dust collector 1 as a dust collector stop process (step: S28). When the dust collector stop process (step: S28) is completed, or when it is determined that a stop instruction has not been received (step S20: NO), the flowchart shown in Fig. 4 ends. When the flowchart ends, the process continues from the start of the flowchart.

[0047] The flowchart shown in Fig. 5 is executed after the flowchart shown in Fig. 4 is completed. As shown in Fig. 5, first, the controller 36 of the dust collection system 2 determines whether or not a startup instruction (i.e., restart) from an operator has been received as a startup determination process (step S30).

[0048] If it is determined that the start-up instruction has been received (step S30: YES), the controller 36 turns on the power of the dust collector 1 as a start-up process (step S32).

[0049] Next, the controller 36 determines whether or not the reset button has been pressed as a reset determination process (step S34). The reset button is displayed on the display device 37, which is configured as a touch panel, for example. The reset button is an operation unit for resetting the storage amount (accumulated volume value) of the dust box 21 stored in the storage device 39 to zero. For example, the reset button is pressed when an operator discharges dust from the dust box 21 of the dust collector 1 to the outside of the dust collector when the dust collector 1 is stopped. When the reset button is pressed, the fact that the reset button has been pressed is recorded in the storage device 39. The controller 36 determines whether or not the reset button has been pressed by referring to the storage device 39. When it is determined that the reset button has been pressed (step S34: YES), the controller 36 sets the storage amount of the dust box 21 to zero as a reset process (step S36).

[0050] If it is determined that the reset button has not been pressed (step S34: NO), the controller 36 performs a differential pressure change output process (step S38) in which the controller 36 acquires the differential pressure, which is the detection result of the sensor 32 and which was stored in the storage process (step S22), and compares it with the current differential pressure. For example, the controller 36 outputs the change in differential pressure by subtracting the current differential pressure from the stored differential pressure.

[0051] Next, the controller 36 outputs the dust volume as a volume output process (step S40). The controller 36 divides the change in differential pressure by the apparent specific gravity of the dust, multiplies it by a coefficient for adjustment, and outputs the dust volume.

[0052] Next, the controller 36 outputs an accumulated value obtained by accumulating the dust volumes output in step S36 as an accumulated value output process (step S42).

[0053] Next, in a storage amount output process (step S44), the controller 36 outputs the storage amount in the dust box 21. The controller 36 outputs the storage amount in the dust box 21 based on the cumulative value obtained in step S38.

[0054] When the storage amount output process (step S44) is completed, when it is determined that there is no start instruction (step S30: NO), or when the reset process (step S36) is completed, the flowchart shown in Fig. 5 is completed. By executing the flowcharts shown in Fig. 4 and Fig. 5, it is possible to obtain the change in differential pressure before and after the operation even in the case of the sweeping process that is executed when the power of the dust collector 1 is turned off.

[0055] [Summary of the embodiment] The dust collector 1 and the dust collection system 2 output information about the volume of dust brushed off the filter 20 based on the change in differential pressure before and after the operation of the brushing device 31 to brush off dust adhering to the filter 20. Because the dust box 21 must be airtightly connected to the dust chamber S1, it is biased toward the bottom 22 of the dust chamber S1. This makes it difficult to directly measure the dust inside the dust box 21. The dust collector 1 and the dust collection system 2 output the volume of the brushed off dust by utilizing the correlation between the change in differential pressure and the weight of the dust brushed off the filter. In this way, the dust collector 1 and the dust collection system 2 can output the volume of the brushed off dust without adding any special sensors or components other than a pressure sensor.

[0056] [Variations] Although various exemplary embodiments have been described above, the present invention is not limited to the above-described exemplary embodiments, and various omissions, substitutions, and modifications may be made. For example, the clean air chamber S2 does not have to be partitioned by the second partition plate 16.

[0057] In the dust collection system 2, the dust collector 1 does not need to include all of the components. FIG. 6 is a block diagram showing an outline of a dust collection system according to a modified example. As shown in FIG. 6, the dust collector 1 is configured to be able to communicate with an external server 4. The controller 36 of the dust collector 1 outputs the detection results of the sensor 32 and operation information of the dust-scrubbing device 31 to the external server 40 via a communication device 40. The second controller 36A of the external server 4 is configured, for example, as a PLC, similar to the controller 36. The second controller 36A may be configured as a computer system including a processor, a memory, an input / output device, and a communication device. The second controller 36A outputs information regarding the volume of dust brushed off from the filter 20 based on the received detection results of the sensor 32 and operation information of the dust-scrubbing device 31. In this way, even when the external server 4 is used, the dust collection system 2 can achieve the same effect. In this case, the notification system 3 is configured by the second controller 36A and the sensor 32.

[0058] [Summary of the embodiments of the present disclosure] The present disclosure includes the following aspects.

[0059] (Clause 1) A dust collection system according to one aspect of the present disclosure comprises: a first air chamber having an intake port through which outside air is introduced; a filter disposed in the first air chamber that separates dust from the air in the first air chamber and allows the air to pass; a second air chamber having an intake port through which air that has passed through the filter is introduced and an exhaust port that communicates with the outside of the device; a blower disposed in the second air chamber that generates an airflow to the exhaust port and sends outside air from the intake port to the first air chamber; a dust removal device disposed in the second air chamber that removes dust adhering to the filter; a box disposed in the first air chamber that collects the dust removed from the filter; a sensor that detects the differential pressure between the first air chamber and the second air chamber; and a control unit that inputs the detection results of the sensor, wherein the control unit outputs information regarding the volume of dust removed from the filter based on the change in the differential pressure before and after the dust removal device operates to remove dust adhering to the filter.

[0060] In this dust collection system, information about the volume of dust brushed off the filter is output based on the change in differential pressure before and after the operation of the brushing device. In this way, the volume of dust brushed off is output by utilizing the correlation between the change in differential pressure and the weight of the dust brushed off the filter. Therefore, the dust collection system can appropriately output the volume of dust brushed off the filter.

[0061] (Clause 2) In the dust collection system described in Clause 1, the control unit may output information about the volume of dust brushed off from the filter based on the amount of change in differential pressure and the apparent specific gravity of the dust. In this case, the dust collection system can more accurately calculate the volume of dust based on the apparent specific gravity of the dust.

[0062] (Clause 3) In the dust collection system described in Clause 1 or 2, the control unit may output information about the amount of dust stored in the box based on information about the volume of dust removed from the filter and the capacity of the box. In this case, the dust collection system can notify an operator of the appropriate timing to empty the box.

[0063] (Clause 4) In the dust collection system described in any one of clauses 1 to 3, in response to an instruction to stop the dust collection system, the blower stops blowing air, the control unit stores the differential pressure detected before the blower stopped, the dust removal device removes dust adhering to the filter after the blower stopped blowing air, and in response to restarting the dust collection system, the control unit may output information about the volume of dust removed from the filter by the dust removal device after the blower stopped, based on the change in the differential pressure detected before the blower stopped and the differential pressure after the dust collection system restarted. In this case, even in the removal process performed when the dust collection system is powered off, the change in differential pressure before and after operation can be obtained.

[0064] (Clause 5) Another aspect of the present disclosure provides an alarm system connected to a dust collector that passes air through a first air chamber, a filter, and a second air chamber in that order to separate dust particles in the air into the filter, the alarm system including a sensor that detects the differential pressure between the first air chamber and the second air chamber, and a control unit that inputs the detection result of the sensor, the control unit acquiring a change in the differential pressure before and after the dust collector operates to brush off dust adhering to the filter, and outputting information about the volume of dust brushed off from the filter based on the change in differential pressure. The alarm system achieves the same effects as the dust collection system described above. [Explanation of symbols]

[0065] 1...dust collector, 10a...intake port, 10b...exhaust port, 15a...inlet, 20...filter, 21...dust box (an example of a box), 30...blower, 32...sensor, S1...dust chamber (an example of a first air chamber), S2...clean air chamber (an example of a second air chamber).

Claims

1. a first air chamber having an air intake port through which outside air is introduced; a filter disposed in the first air chamber, which separates dust from the air in the first air chamber and allows the air to pass through; a second air chamber having an inlet through which the air that has passed through the filter is introduced and an exhaust port that communicates with the outside of the device; a blower disposed in the second air chamber, generating an airflow toward the exhaust port and sending the outside air from the intake port to the first air chamber; a dust removal device disposed in the second air chamber and configured to remove dust adhering to the filter; a box disposed in the first air chamber for collecting dust removed from the filter; a sensor for detecting a differential pressure between the first air chamber and the second air chamber; a control unit that receives the detection results of the sensor; Equipped with The control unit outputs information regarding the volume of dust brushed off from the filter based on a change in the differential pressure before and after the operation of the brushing device to brush off the dust adhering to the filter. Dust collection system.

2. The dust collection system according to claim 1 , wherein the control unit outputs information relating to the volume of dust brushed off from the filter based on the amount of change in the differential pressure and the apparent specific gravity of the dust.

3. The dust collection system according to claim 1 or 2, wherein the control unit outputs information about the amount of dust stored in the box based on information about the volume of dust brushed off from the filter and a capacity of the box.

4. In response to a command to stop the dust collection system, The blower stops blowing air, The control unit stores the differential pressure detected before the blower is stopped, The dust removal device removes dust adhering to the filter after the blower stops blowing air, In response to the dust collection system being restarted, 3. The dust collection system according to claim 1, wherein the control unit outputs information regarding the volume of dust removed from the filter by the dust removal device after the blower is stopped, based on a change in the differential pressure detected before the blower is stopped and the differential pressure after the dust collection system is restarted.

5. An alarm system connected to a dust collector that passes air through a first air chamber, a filter, and a second air chamber in this order to separate dust particles in the air into the filter, a sensor for detecting a differential pressure between the first air chamber and the second air chamber; a control unit that receives the detection results of the sensor; Equipped with The control unit acquires a change in the differential pressure before and after the dust collector performs an operation to shake off dust adhering to the filter, and outputs information regarding the volume of the dust shaken off from the filter based on the change in the differential pressure. Notification system.

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