Automatic ash removal device and automatic ash removal control method

Abstract

The invention discloses an automatic ash removal device and an automatic ash removal control method. The automatic ash removal device comprises an external structure and an internal structure. The external structure comprises a dust removal box body, an upper box body, a dust hopper, a dust discharging valve, a bracket, a dust inlet and a purified gas outlet; the internal structure comprises a filter bag assembly, a box body partition plate, a lifting mechanism, a scraper mechanism and a pressure difference transmitter; the invention provides a novel ash removal mode, the damage to the filter bag is small, a back-blowing fan and a compressed air source are not needed, and the equipment investment is saved. During gas dust removal, dust removal operation can be synchronously carried out, and the operation efficiency of dust removal equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bag filters, and particularly to an automatic dust cleaning device and an automatic dust cleaning control method. Background Art

[0002] A bag filter is a dry dust filtering device. Due to its high dust removal efficiency and stable operation, it has become a key technical equipment for solving industrial dust emissions at present.

[0003] After a bag filter is used for a period of time, a layer of dust will accumulate on the surface of the filter bag, resulting in a reduction in dust removal efficiency and the need for timely dust cleaning. At present, there are mainly two dust cleaning methods for bag filters: vibration type and reverse blowing type. Vibration dust cleaning is to make the filter bag vibrate through a vibration device to achieve the purpose of dust cleaning. However, this method has poor dust cleaning effect and certain mechanical damage to the filter bag. Reverse blowing dust cleaning is to blow the filter bag in the reverse direction through external air flow or compressed gas, so that the dust on the surface of the filter bag falls off. However, this method requires the configuration of a reverse blower, a pulse valve, compressed gas, etc., increasing additional investment costs. At the same time, the gas dust removal needs to be stopped during the dust cleaning process, affecting the operation efficiency of the dust removal equipment. Summary of the Invention

[0004] The present invention provides an automatic dust cleaning device and an automatic dust cleaning control method. In the dust cleaning device, the rubber strip in the dust cleaning plate moves up and down on the surface of the filter bag, so that the dust on the surface of the filter bag falls off to achieve the purpose of dust cleaning. This method is different from the vibration type dust cleaning device and the reverse blowing type dust cleaning device. It is a brand-new dust cleaning method with high dust cleaning efficiency, little damage to the filter bag, no need for devices such as a reverse blower, and can perform dust cleaning and gas dust removal simultaneously, improving the operation efficiency of the dust removal equipment. To achieve the above purpose, the technical solution of the present invention is as follows.

[0005] An automatic dust cleaning device includes an external structure and an internal structure; wherein, the external structure includes a dust removal box body, an upper box body, a dust hopper, a dust discharge valve, a bracket, a dust inlet and a clean gas outlet; the internal structure includes a filter bag assembly, a box body partition, a lifting mechanism, a scraping mechanism and a differential pressure transmitter; the filter bag assembly is fixed on the box body partition; the lifting mechanism is fixed on the inner side of the upper box body and is fixedly connected with the scraping mechanism for driving the scraping mechanism to move up and down; the scraping mechanism is slidably sleeved on the filter bag assembly for scraping the dust accumulated on the surface of the filter bag in the filter bag assembly.

[0006] As a further technical solution of the present invention, the upper box body and the dust hopper are respectively located on the upper and lower sides of the dust removal box body, the bracket is fixedly connected with the dust removal box body, the dust inlet is arranged on one side of the dust hopper, and the clean gas outlet is arranged on one side of the upper box body.

[0007] As a further technical solution of the present invention, the filter bag assembly is composed of a framework and a filter bag, and the filter bag is wrapped outside the framework.

[0008] As a further technical solution of the present invention, the scraper mechanism is composed of a scraper and a rubber strip. A lot of dust removal holes are distributed on the scraper. On the one hand, gas can pass through, and on the other hand, the scraped dust can pass through and fall into the ash hopper; the rubber strip is embedded in the annular groove of the scraper. The rear end of the rubber strip has a lead angle, which is convenient for loading into and taking out of the annular groove. The front end of the rubber strip is conical to improve the ash removal efficiency.

[0009] As a further technical solution of the present invention, the lifting mechanism is composed of a motor, a coupling, a lead screw, a lead screw nut, a guide shaft, a connecting seat, a ball bearing and a fixed seat; the rotation of the motor drives the lead screw to rotate through the coupling, and then is converted into the up and down movement of the connecting seat through the lead screw nut; the connecting seat is fixedly connected with the scraper mechanism.

[0010] As a further technical solution of the present invention, the motor of the lifting mechanism is connected to the PLC controller, and the differential pressure transmitter is connected to the PLC controller. The PLC controller monitors the differential pressure between the dust inlet and the clean gas outlet of the dust cleaning device in real time.

[0011] Another object of the present invention is to provide an automatic dust cleaning control method, which is implemented based on the above automatic dust cleaning device. The method includes the following steps:

[0012] Detect the differential pressure value ΔP between the dust inlet and the clean gas outlet;

[0013] Determine whether ΔP is greater than the differential pressure threshold;

[0014] If ΔP is greater than the differential pressure threshold, the PLC controller drives the motor, and the scraper mechanism moves up and down to complete an action cycle;

[0015] Detect the differential pressure value ΔP between the dust inlet and the clean gas outlet;

[0016] Determine whether ΔP is greater than the differential pressure threshold;

[0017] If ΔP is not greater than the differential pressure threshold, the scraper mechanism returns to the initial position and the motor stops; if ΔP is greater than the differential pressure threshold, the dust cleaning action will continue until the dust cleaning process is completed.

[0018] The beneficial effects achieved by the present invention:

[0019] The present invention provides a new dust cleaning method, which has little damage to the filter bag, does not require a reverse blower and a compressed air source, and saves equipment investment. In gas dust removal, the dust cleaning operation can be carried out synchronously, improving the operation efficiency of the dust removal equipment. Description of the Drawings

[0020] Figure 1 It is the front view of the automatic dust cleaning device.

[0021] Figure 2 It is the sectional view of the automatic dust cleaning device.

[0022] Figure 3 It is the structural schematic diagram of the lifting mechanism in the automatic dust cleaning device.

[0023] Figure 4 It is the structural schematic diagram of the filter bag assembly in the automatic dust cleaning device.

[0024] Figure 5 It is the top view of the scraper mechanism in the automatic dust cleaning device.

[0025] Figure 6 It is the sectional view of the scraper mechanism in the automatic dust cleaning device.

[0026] Figure 7 It is the sectional view of the rubber strip in the automatic dust cleaning device.

[0027] Figure 8 It is the connection schematic diagram of the differential pressure transmitter and the PLC controller in the automatic dust cleaning device.

[0028] Figure 9 It is the flow chart of the automatic dust cleaning control method.

[0029] Annotation of reference numerals: 1-dust removal box body, 2-upper box body, 3-ash hopper, 4-ash discharge valve, 5-bracket, 6-dust inlet, 7-clean gas outlet, 8-filter bag assembly, 8a-skeleton, 8b-filter bag, 9-box body partition, 10-lifting mechanism, 10a-motor, 10b-coupling, 10c-screw rod, 10d-screw rod nut, 10e-guide shaft, 10f-connecting seat, 10g-ball bearing, 10h-fixed seat, 11-scraper mechanism, 11a-scraper, 11b-rubber strip, 11c-dust removal hole, 11d-annular groove, 12-differential pressure transmitter, 13-PLC controller. Detailed implementation manners

[0030] The technical solutions of the present invention will be described in detail below with reference to the specific drawings.

[0031] Please refer to Figures 1 to 8, embodiments of the present invention provide an automatic dust cleaning device, including an external structure and an internal structure; wherein, the external structure includes a dust removal box body 1, an upper box body 2, a dust hopper 3, a dust discharge valve 4, a bracket 5, a dust inlet 6 and a clean gas outlet 7; dust gas enters from the dust inlet 6, and after internal filtration, the purified gas is discharged from the clean gas outlet 7 of the upper box body 2, and the filtered dust is collected in the dust hopper 3, and the dust is discharged by opening the dust discharge valve 4; the internal structure includes a filter bag assembly 8, a box body partition 9, a lifting mechanism 10, a scraping mechanism 11 and a differential pressure transmitter 12; the filter bag assembly 8 is fixed on the box body partition 9; the lifting mechanism 10 is fixed inside the upper box body 2 and is fixedly connected to the scraping mechanism 11 for driving the scraping mechanism 11 to move up and down; the scraping mechanism 11 is slidably sleeved on the filter bag assembly 8 for scraping the dust accumulated on the surface of the filter bag 8b in the filter bag assembly 8.

[0032] In this embodiment, the upper box body 2 and the dust hopper 3 are respectively located on the upper and lower sides of the dust removal box body 1, the bracket 5 is fixedly connected to the dust removal box body 1, the dust inlet 6 is arranged on one side of the dust hopper 3, and the clean gas outlet 7 is arranged on one side of the upper box body 2.

[0033] In this embodiment, the filter bag assembly 8 is composed of a skeleton 8a and a filter bag 8b, and the filter bag 8b is wrapped outside the skeleton 8a.

[0034] In this embodiment, the scraping mechanism 11 is composed of a scraper 11a and a rubber strip 11b. A lot of dust removal holes 11c are distributed on the scraper 11a. On the one hand, gas can pass through, and on the other hand, the scraped dust can pass through and fall into the dust hopper; the rubber strip 11b is embedded in the annular groove 11d of the scraper 11a. The rear end of the rubber strip 11b has a lead angle, which is convenient for loading into and taking out of the annular groove 11d. The front end of the rubber strip 11b is conical to improve the dust removal efficiency.

[0035] In this embodiment, the lifting mechanism 1 is composed of a motor 10a, a coupling 10b, a lead screw 10c, a lead screw nut 10d, a guide shaft 10e, a connecting seat 10f, a ball bearing 10g and a fixed seat 10h; the rotation of the motor 10a drives the lead screw 10c to rotate through the coupling 10b, and then is converted into the up and down movement of the connecting seat 10f through the lead screw nut 10d; the connecting seat 10f is fixedly connected to the scraping mechanism 11.

[0036] In this embodiment, the motor 10a of the lifting mechanism 10 is connected to the PLC controller 13, and the differential pressure transmitter 12 is connected to the PLC controller 13. The PLC controller 13 monitors in real time the differential pressure between the dust inlet 6 and the clean gas outlet 7 of the dust cleaning device. The differential pressure value ΔP = inlet pressure - outlet pressure. A differential pressure threshold is preset in the PLC controller 13. If ΔP is greater than the preset differential pressure threshold, it indicates that the filter bag is blocked by dust. At this time, after being detected by the PLC controller 13, an instruction is issued to drive the motor 10a to complete one dust cleaning cycle. If it is still blocked, the dust cleaning action will continue until the dust cleaning process is completed.

[0037] Please refer to Figure 9 , another object of the present invention is to provide an automatic dust cleaning control method. The dust cleaning control method is implemented based on the above automatic dust cleaning device, and the method includes the following steps:

[0038] Detect the differential pressure value ΔP between the dust inlet 6 and the clean gas outlet 7;

[0039] Determine whether ΔP is greater than the differential pressure threshold;

[0040] If ΔP is greater than the differential pressure threshold, the PLC controller 13 drives the motor 10a, and the scraper mechanism 11 moves up and down to complete one action cycle;

[0041] Detect the differential pressure value ΔP between the dust inlet 6 and the clean gas outlet 7;

[0042] Determine whether ΔP is greater than the differential pressure threshold;

[0043] If ΔP is not greater than the differential pressure threshold, the scraper mechanism 11 is returned to the initial position and the motor 10a stops operating. If ΔP is greater than the differential pressure threshold, the dust cleaning action will continue until the dust cleaning process is completed.

[0044] The interval of dust cleaning can be set through the program in the control system. For example, dust cleaning is performed every few hours, or dust cleaning is performed in real time when it is detected that the system differential pressure exceeds the specified value.

[0045] It should be noted that in this article, the term "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or elements inherent to such a process, article, or device. Without further limitations, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, article, or device including that element.

[0046] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. Automatic dust cleaning device, characterized in that: It includes an external structure and an internal structure; wherein the external structure includes a dust removal box, an upper box, an ash hopper, an ash discharge valve, a bracket, a dust inlet and a clean air outlet; the internal structure includes a filter bag assembly, a box partition, a lifting mechanism, a scraper mechanism and a pressure differential transmitter; the filter bag assembly is fixed on the box partition; the lifting mechanism is fixed on the inner side of the upper box and is fixedly connected to the scraper mechanism to drive the scraper mechanism to move up and down; the scraper mechanism is slidably mounted on the filter bag assembly to scrape off dust accumulated on the surface of the filter bag in the filter bag assembly.

2. The automatic dust cleaning device according to claim 1, characterized in that: The upper box body and the ash hopper are respectively located at the upper and lower sides of the dust removal box body, the bracket is fixedly connected to the dust removal box body, the dust inlet is arranged on one side of the ash hopper, and the clean air outlet is arranged on one side of the upper box body.

3. The automatic dust cleaning device according to claim 1, characterized in that: The filter bag assembly consists of a frame and a filter bag, and the filter bag is wrapped around the outside of the frame.

4. The automatic dust cleaning device according to claim 1, characterized in that: The scraper mechanism consists of a scraper and a rubber strip, and the scraper is provided with many dust removal holes; the rubber strip is embedded in the annular groove of the scraper, and the rear end of the rubber strip has a lead angle for easy insertion into the annular groove and removal, and the front end of the rubber strip is tapered.

5. The automatic dust cleaning device according to claim 1, characterized in that: The lifting mechanism is composed of a motor, a coupling, a screw, a screw nut, a guide shaft, a connecting seat, a ball bearing and a fixed seat; the rotation of the motor drives the screw to rotate through the coupling, and then converts it into up and down movement of the connecting seat through the screw nut; the connecting seat is fixedly connected to the scraper mechanism.

6. The automatic dust cleaning device according to claim 1, characterized in that: The motor of the lifting mechanism is connected to the PLC controller, the differential pressure transmitter is connected to the PLC controller, and the PLC controller monitors the differential pressure value between the dust inlet and the clean air outlet of the dust cleaning device in real time.

7. Automatic dust cleaning control method, characterized in that: The dust cleaning control method is implemented based on the automatic dust cleaning device according to any one of claim 6, and the method comprises the following steps: Detect the pressure difference ΔP between the dust inlet and the clean air outlet; Determine whether ΔP is greater than a pressure difference threshold; If ΔP is greater than the pressure difference threshold, the PLC controller drives the motor and the scraper mechanism moves up and down to complete an action cycle; Detect the pressure difference ΔP between the dust inlet and the clean air outlet; Determine whether ΔP is greater than a pressure difference threshold; If ΔP is not greater than the pressure difference threshold, the scraper mechanism returns to the initial position and the motor stops moving; If ΔP is greater than the pressure difference threshold, the cleaning action will continue until the cleaning process is completed.

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