A detection system for filter bag damage using the absolute flow rate method

Abstract

An absolute flow rate method for detecting filter bag damage includes: a bag cage, a blower plate, a lifting mechanism, a turntable, and two detection devices. The blower plate is horizontally positioned inside the bag cage, and multiple blow pipes are evenly arranged inside the blower plate. The air outlets of the blow pipes are all positioned directly opposite the inner wall of the bag cage, and the air inlets of the blow pipes are connected to an air supply device. The blower plate is fixedly connected to the telescopic end of the lifting mechanism. The turntable is positioned directly above the bag cage, and two arc-shaped slides are provided on the turntable. Each arc-shaped slide contains a detection device, and the tops of the two detection devices slide in cooperation with their corresponding arc-shaped slides. An air flow meter is installed on each detection device. This design can not only detect the difference in airflow at different positions on the filter bag using the air flow meter to quickly locate the size of the damage at different positions on the same ring of the filter bag, but also determine whether the filter bag is damaged by detecting the difference in airflow between different height positions on the filter bag.

Description

Technical Field

[0001] This invention relates to a detection system, belonging to the technical field of baghouse dust collectors, and particularly to a detection system for detecting filter bag damage using the absolute flow method. Background Technology

[0002] With the rapid advancement of industrialization, air pollution has intensified. Industrial smoke and dust from industries such as coal-fired power plants and waste incineration are significant contributors to the formation of particulate matter and smog. Therefore, controlling industrial smoke and dust emissions is a primary means of addressing smog and improving air quality. In practical engineering applications, baghouse dust collectors can filter exhaust gases, offering high dust removal efficiency and effective dust cleaning, making them one of the main methods for effectively controlling industrial smoke and dust emissions.

[0003] As the core component of a baghouse dust collector, the filter bag's condition directly affects the dust collection efficiency and service life of the dust collector. Currently, the filter material used in filter bags is mainly made of synthetic fibers, primarily aramid needle-punched felt filter bags. Aramid needle-punched felt filter bags have advantages such as ultra-high strength, high temperature resistance, acid and alkali resistance, and long service life. However, in actual use, the filter bags can still experience fatigue or even damage due to the high temperature of the filtered air and acid and alkali corrosion. When the damage is severe, the filtration performance of the filter bag will decrease. Therefore, it is necessary to regularly inspect the condition of the filter bags.

[0004] Currently, the method for detecting filter bag damage is usually through manual visual inspection, which is inefficient and increases the workload of staff.

[0005] Utility model patent application No. 202120045102.0, filed on January 8, 2021, discloses a bag filter condition detection device, including a base frame. A support plate is symmetrically fixedly connected to the top of the base frame. A top frame, symmetrical to the base frame, is fixedly fixedly connected to the top of the support plate. Several partitions are evenly fixedly connected along the long side between the base frame and the top frame. A connecting groove is formed inside the base frame between two adjacent partitions, and a connecting cavity is fixedly connected inside the connecting groove. Connecting rods are fixedly connected to the four outer corners of the base frame. While this method allows workers to easily identify the location of damage by detecting changes in the color of the wet cloth, this design still has the following drawbacks:

[0006] It still requires manual visual inspection by staff, which results in low inspection efficiency.

[0007] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the application, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of existing technologies that require manual visual inspection and have low detection efficiency, and to provide a detection system that can automatically monitor and detect filter bag damage by airflow and uses the absolute flow method to detect filter bag damage with high detection efficiency.

[0009] To achieve the above objectives, the technical solution of the present invention is:

[0010] A detection system for detecting filter bag damage using the absolute flow method is disclosed. The system includes a bag cage, a blow-through plate, a lifting mechanism, a turntable, and two detection devices. The bag cage is vertically mounted on the floor. The blow-through plate is horizontally positioned inside the bag cage. Multiple blow-through pipes are evenly arranged inside the blow-through plate. The outlets of the blow-through pipes pass through the side wall of the blow-through plate and are connected to the atmosphere. The outlets of the blow-through pipes are all positioned facing the inner wall of the bag cage. The inlets of the blow-through pipes are connected to an air supply device via flexible inlet hoses. The bottom of the blow-through plate is fixed to the telescopic end of the lifting mechanism. The connection point between the lifting mechanism and the blowing plate is located at the rotation center of the blowing plate. The base of the lifting mechanism is fixedly installed on the floor in a vertical direction. The turntable is located directly above the bag cage. Two arc-shaped slides are provided on the turntable. The centers of the two arc-shaped slides are both located on the extension line of the central axis of the bag cage. Each of the two arc-shaped slides is equipped with a detection device. The top of the two detection devices slides in cooperation with their corresponding arc-shaped slides. An air flow meter is fixedly installed on the detection device. The detection port of the air flow meter is set directly opposite the air outlet.

[0011] The blowing disc includes multiple blowing pipes and a disc body. The disc body is a circular structure and is horizontally arranged inside the bag cage. The side wall of the disc body is clearance-fitted with the inner wall of the bag cage. The bottom of the disc body is fixedly connected to the piston rod of the lifting mechanism. The connection point between the disc body and the lifting mechanism is located at the rotation center of the blowing disc. Multiple blowing pipes are evenly arranged in the disc body along the circumferential direction. The air inlets of the multiple blowing pipes pass through the side wall of the disc body and are connected to the atmosphere.

[0012] The two arc-shaped slides are through grooves running vertically through each other, and the radius of the arc-shaped slides is larger than the radius of the bag cage.

[0013] The detection device includes an air flow meter, a limiting plate, and a connecting rod. The limiting plate is positioned directly above the arc-shaped slide, and its diameter is greater than the width of the arc-shaped slide. A threaded hole is formed on the limiting plate along the vertical direction. The connecting rod is a threaded rod, and its top passes through the threaded hole and is threadedly connected to the limiting plate. The top of the air flow meter is fixedly connected to the bottom of the connecting rod.

[0014] The spray plate has a cavity in the middle. The bottom of the cavity is connected to the air supply device through an air inlet hose. Multiple spray pipes are evenly arranged along the circumference on the side wall of the cavity. The air inlet of the spray pipe is located on the side wall of the cavity. The air outlet of the spray pipe passes through the side wall of the spray plate and is connected to the atmosphere. The spray pipe has a conical tube structure. The diameter of the air inlet of the spray pipe is larger than the diameter of the air outlet.

[0015] The cage is a cylindrical cage made of a set of steel bars. The cage includes multiple longitudinal bars and multiple ring bars. The multiple longitudinal bars are fixedly set on the ground in the vertical direction. The multiple longitudinal bars are evenly set in the circumference of the lifting mechanism. The distance between the multiple longitudinal bars and the lifting mechanism is equal to the radius of the ring bars. The multiple ring bars are evenly set in the horizontal direction from top to bottom between the multiple longitudinal bars. The outer circumference of the multiple ring bars is fixedly connected to each of the longitudinal bars.

[0016] The air outlet of the blowpipe is positioned directly opposite the gap between each longitudinal rib.

[0017] The lifting mechanism is a telescopic hydraulic cylinder. The piston rod of the lifting mechanism is fixedly connected to the bottom of the spray plate, and the piston seat of the lifting mechanism is fixedly installed on the floor in the vertical direction.

[0018] The detection system also includes a pressure plate, which is disposed between the turntable and the bag cage.

[0019] The detection system also includes a pressure ring, which is sleeved on the bag cage. The inner wall of the pressure ring is clearance-fitted with the outer wall of the bag cage, and the height of the bag cage is less than or equal to the length of the filter bag.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. In the absolute flow rate method for detecting filter bag damage, the present invention discloses a filter bag cage vertically mounted on the floor. A blower plate is installed inside the filter bag cage, and multiple blower pipes are installed inside the blower plate. The air outlets of the multiple blower pipes are all positioned directly opposite the inner wall of the filter bag cage. The air inlets of the multiple blower pipes are connected to an air supply device via air inlet hoses 26. During use, the filter bag to be tested is placed on the filter bag cage. When the air supply device is activated, the compressed air generated by the air supply device can be blown onto the filter bag through the blower pipes. Simultaneously, a turntable is installed directly above the filter bag cage. A detection device is installed in a slide rail on the turntable. The detection device is equipped with an air flow meter, and the detection port of the air flow meter is positioned directly opposite the air outlet of the blower pipes. When compressed air passes through the filter bag, the air flow meter can detect the air flow rate through the filter bag. The detection device can slide within the turntable, allowing the air flow meter to detect the difference in air flow rate at different locations on the same segment of the filter bag. If the air flow rate at a certain location on the filter bag is too high, it indicates that the damage at that location is greater than at other locations. Therefore, this design can detect the difference in airflow at different locations on the filter bag using an air flow meter, quickly locate the size of damage at different locations on the same segment of the filter bag, and effectively improve the damage detection efficiency.

[0022] 2. In the absolute flow rate method for detecting filter bag damage according to the present invention, the bottom of the blowing disc is fixedly connected to the telescopic end of the lifting mechanism. When the lifting mechanism is working, the blowing disc can move up and down inside the bag cage. The detection device includes an air flow meter, a limiting plate, and a connecting rod. The limiting plate has a threaded hole, and the connecting rod is a threaded rod. The top of the connecting rod passes through the threaded hole and is threadedly connected to the limiting plate. When the connecting rod or the limiting plate rotates, the connecting rod can move up and down relative to the limiting plate. At this time, the air flow meter fixed at the bottom of the connecting rod moves up and down synchronously, so that the air flow meter can adjust its height according to the position of the blowing disc, thereby monitoring the damage at different heights on the filter bag to be tested. When the distance between each detection position is consistent, and the detected filter bag is not damaged, the difference in air flow at adjacent positions should be consistent. When the difference in air flow at adjacent positions is inconsistent, it can be determined that the filter bag is damaged. Therefore, this design can determine whether the filter bag is damaged by detecting the difference in air flow between different height positions on the filter bag, avoiding damage or blockage at various positions within the same segment of the filter bag, which would lead to detection errors.

[0023] 3. In the absolute flow rate method for detecting filter bag damage according to the present invention, a cavity is formed in the middle of the blowing disc. Multiple blowing pipes are evenly arranged along the circumferential direction on the sidewall of the cavity. The blowing pipes have a tapered tube structure, and the diameter of the air inlet of the blowing pipe is larger than the diameter of the air outlet. This allows the blowing pipes to increase the flow rate of compressed air supplied by the air supply device, further improving the detection effect on the damaged parts of the filter bag. Therefore, this design can effectively improve the detection effect on the damaged parts of the filter bag by increasing the flow rate of compressed air through the blowing pipes.

[0024] 4. In the absolute flow rate method for detecting filter bag damage according to the present invention, a pressure plate is provided between the turntable and the bag cage. After the filter bag is placed on the bag cage, the pressure plate can press the filter bag tightly against the top of the bag cage, preventing the filter bag from being blown away by compressed air. The height of the bag cage is less than or equal to the length of the filter bag, so that the bottom of the filter bag can contact the ground after it is placed on the bag cage. At this time, the pressure ring is placed outside the bag cage, and the pressure ring can press the open side of the filter bag tightly, sealing the filter bag with the floor and preventing high-pressure air from the blowpipe from leaking out, which would result in insufficient airflow through the filter bag. Therefore, this design can press the filter bag tightly by the pressure plate and pressure ring, preventing the filter bag from being blown away by compressed air while also preventing high-pressure air leakage. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] Figure 2 This is a perspective view of the present invention.

[0027] Figure 3 yes Figure 1 A schematic diagram of the structure of the central jet blowing plate.

[0028] Figure 4 yes Figure 1 A cross-sectional view of the central jetting disc from the front view.

[0029] Figure 5 yes Figure 1 A top-view cross-sectional view of the central jet nozzle.

[0030] Figure 6 yes Figure 1 A schematic diagram of the transfer tray.

[0031] Figure 7 yes Figure 2 A schematic diagram of the structure of the medium-sized bag cage.

[0032] Figure 8 yes Figure 1 A schematic diagram of the middle limit plate.

[0033] Figure 9 This is a cross-sectional view of the spray plate in Example 4.

[0034] In the diagram: 1. Bag cage, 11. Longitudinal rib, 12. Ring rib, 2. Blowing disc, 21. Blowing pipe, 22. Air outlet, 23. Air inlet, 24. Disc body, 25. Cavity, 26. Air inlet hose, 3. Lifting mechanism, 4. Turntable, 41. Arc-shaped slide, 5. Detection device, 51. Air flow meter, 52. Limiting disc, 53. Connecting rod, 54. Threaded hole, 6. Floor, 7. Pressure plate, 8. Pressure ring, 9. Filter bag, 10. Air supply device. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] See Figures 1 to 9 An absolute flow rate method for detecting filter bag damage is disclosed. The system includes a bag cage 1, a blow-dip disc 2, a lifting mechanism 3, a turntable 4, and two detection devices 5. The bag cage 1 is vertically mounted on a floor 6. The blow-dip disc 2 is horizontally positioned inside the bag cage 1. Multiple blow-dip pipes 21 are evenly arranged inside the blow-dip disc 2. The air outlets 22 of the blow-dip pipes 2 pass through the side wall of the blow-dip disc 2 and are connected to the atmosphere. The air outlets 22 of the blow-dip pipes 2 are all positioned facing the inner wall of the bag cage 1. The air inlets 23 of the blow-dip pipes 21 are connected to an air supply device 10 via air inlet hoses 26. The bottom of the blow-dip disc 2 is connected to the extension / retraction mechanism 3. The lifting mechanism 3 and the spray plate 2 are fixedly connected at the end. The connection point between the lifting mechanism 3 and the spray plate 2 is located at the rotation center of the spray plate 2. The base of the lifting mechanism 3 is fixedly installed on the floor 6 in the vertical direction. The turntable 4 is located directly above the bag cage 1. Two arc-shaped slides 41 are opened on the turntable 4. The center of the two arc-shaped slides 41 is located on the extension line of the central axis of the bag cage 1. Each of the two arc-shaped slides 41 is equipped with a detection device 5. The top of the two detection devices 5 slides in cooperation with their corresponding arc-shaped slides 41. An air flow meter 51 is fixedly installed on the detection device 5. The detection port of the air flow meter 51 is set directly opposite the air outlet 22.

[0037] The blowing disc 2 includes multiple blowing pipes 21 and a disc body 24. The disc body 24 is a circular disc structure. The disc body 24 is arranged horizontally inside the bag cage 1. The side wall of the disc body 24 is clearance-fitted with the inner wall of the bag cage 1. The bottom of the disc body 24 is fixedly connected to the piston rod of the lifting mechanism 3. The connection point between the disc body 24 and the lifting mechanism 3 is located at the rotation center of the blowing disc 2. Multiple blowing pipes 21 are evenly arranged in the disc body 24 along the circumferential direction. The air inlets 23 of the multiple blowing pipes 21 pass through the side wall of the disc body 24 and are connected to the atmosphere.

[0038] The two arc-shaped slides 41 are through grooves that run vertically through each other, and the radius of the arc-shaped slides 41 is larger than the radius of the bag cage 1.

[0039] The detection device 5 includes an air flow meter 51, a limiting plate 52, and a connecting rod 53. The limiting plate 52 is located directly above the arc-shaped slide 41. The diameter of the limiting plate 52 is larger than the width of the arc-shaped slide 41. A threaded hole 54 is provided on the limiting plate 52 along the vertical direction. The connecting rod 53 is a threaded rod. The top of the connecting rod 53 passes through the threaded hole 54 and is threadedly connected to the limiting plate 52. The top of the air flow meter 51 is fixedly connected to the bottom of the connecting rod 53.

[0040] The spray plate 2 has a cavity 25 in the middle. The bottom of the cavity 25 is connected to the air supply device 10 through an air inlet hose 26. Multiple spray pipes 21 are evenly arranged along the circumferential direction on the side wall of the cavity 25. The air inlet 23 of the spray pipe 21 is located on the side wall of the cavity 25. The air outlet 22 of the spray pipe 21 passes through the side wall of the spray plate 2 and is connected to the atmosphere. The spray pipe 21 has a tapered tube structure. The diameter of the air inlet 23 of the spray pipe 21 is larger than the diameter of the air outlet 22.

[0041] The cage 1 is a cylindrical cage made of a set of steel bars. The cage 1 includes multiple longitudinal bars 11 and multiple ring bars 12. The multiple longitudinal bars 11 are all fixedly set on the ground 6 in the vertical direction. The multiple longitudinal bars 11 are evenly arranged in the circumferential direction of the lifting mechanism 3. The distance between the multiple longitudinal bars 11 and the lifting mechanism 3 is equal to the radius of the ring bars 12. The multiple ring bars 12 are evenly arranged in the horizontal direction from top to bottom between the multiple longitudinal bars 11. The outer circumference of the multiple ring bars 12 is fixedly connected to each of the longitudinal bars 11.

[0042] The air outlet 22 of the blowpipe 21 is positioned directly opposite the gap between each longitudinal rib 11.

[0043] The lifting mechanism 3 is a telescopic hydraulic cylinder. The piston rod of the lifting mechanism 3 is fixedly connected to the bottom of the spray plate 2, and the piston seat of the lifting mechanism 3 is fixedly installed on the floor 6 in the vertical direction.

[0044] The detection system also includes a pressure plate 7, which is disposed between the turntable 4 and the bag cage 1.

[0045] The detection system also includes a pressure ring 8, which is sleeved on the bag cage 1. The inner wall of the pressure ring 8 is clearance-fitted with the outer wall of the bag cage 1, and the height of the bag cage 1 is less than or equal to the length of the filter bag 9.

[0046] The principle of this invention is explained as follows:

[0047] In actual use, filter bags work by separating airflow through gaps between the fibers of the bag body, while dust and other particles carried in the airflow cannot pass through. This separation achieves the filtration effect. Due to the filtration principle, a large amount of dust accumulates on the filter bag body. Regular cleaning with a spray gun is necessary to prevent dust from clogging the gaps between the fibers and reducing the filter bag's filtration performance. However, this cleaning method can lead to excessive contact between high-speed compressed air and the filter bag body, accelerating the wear and tear on the filter bag fabric fibers. Deformation can occur, leading to a certain degree of physical fatigue in the filter bag. At the same time, the high temperature of the flue gas that the filter bag comes into contact with during normal use may also contain high-temperature water vapor, which not only exceeds the temperature limit that the filter bag itself can withstand, causing fatigue and affecting filtration performance, but also the acidic and alkaline substances in the emitted flue gas can cause a certain degree of corrosion to the filter bag. At the moment the flue gas is emitted, the high-temperature water vapor comes into contact with the surface of the filter bag and causes condensation, which corrodes the filter bag. At the same time, the dust in the flue gas combines with the water on the filter bag to form clumps that cannot be removed, which will also accelerate the damage of the filter bag.

[0048] Example 1:

[0049] A detection system for detecting filter bag damage using the absolute flow method is disclosed. The system includes a bag cage 1, a blow-through plate 2, a lifting mechanism 3, a turntable 4, and two detection devices 5. The bag cage 1 is vertically mounted on a floor 6. The blow-through plate 2 is horizontally positioned inside the bag cage 1. Multiple blow-through pipes 21 are evenly arranged inside the blow-through plate 2. The air outlets 22 of the multiple blow-through pipes 2 pass through the side wall of the blow-through plate 2 and are connected to the atmosphere. The air outlets 22 of the multiple blow-through pipes 2 are all positioned facing the inner wall of the bag cage 1. The air inlets 23 of the multiple blow-through pipes 21 are connected to an air supply device 10 via air inlet hoses 26. The bottom of the blow-through plate 2 is connected to the telescopic end of the lifting mechanism 3. The lifting mechanism 3 and the spray plate 2 are fixedly connected, with the connection point between the lifting mechanism 3 and the spray plate 2 located at the rotation center of the spray plate 2. The base of the lifting mechanism 3 is fixedly installed on the floor 6 in the vertical direction. The turntable 4 is located directly above the bag cage 1. Two arc-shaped slides 41 are provided on the turntable 4. The centers of the two arc-shaped slides 41 are both located on the extension line of the central axis of the bag cage 1. Each of the two arc-shaped slides 41 is provided with a detection device 5. The tops of the two detection devices 5 are slidably engaged with their corresponding arc-shaped slides 41. An air flow meter 51 is fixedly installed on the detection device 5. The detection port of the air flow meter 51 is set directly opposite the air outlet 22.

[0050] During the use of this design:

[0051] The filter bag 9 is placed on the bag cage 1, and the bottom of the filter bag 9 is sealed to the ground 6. The lifting mechanism 3 is turned on until the blowing plate 2 moves to the bottom of the bag cage 1. When the blowing plate 2 moves to the bottom of the bag cage 1, the lifting mechanism 3 stops working. At the same time, the air supply device 10 is turned on. The air supply device 10 supplies air to each blowing pipe 21 in the blowing plate 2 through the air inlet hose 26. The air outlet 22 of the blowing pipe 21 is set directly facing the inner wall of the bag cage 1. At this time, the compressed gas is sprayed out from the air outlet 22 of the blowing pipe 21 and passes through the filter bag 9 into the detection port of the air flow meter 51. The air flow meter 51 can detect the air flow through the filter bag 9. At this time, the detection device 5 is moved so that the detection device 5 rotates around the outer circumference of the bag cage 1. During the movement of the detection device 5, the air flow meter 51 detects the air flow data at each position on the filter bag 9 ring. When the air flow data at each position on the filter bag 9 ring is detected, the air flow data detection step is completed.

[0052] After the air flow data at each position on the filter bag 9 ring section is detected, the lifting mechanism 3 starts to work, raising the height of the spray plate 2 by one stage, so that the spray plate 2 is facing another ring section on the filter bag 9, and at the same time moving the air flow meter 51 upward until the detection port of the air flow meter 51 set on the connecting rod 53 is facing the air outlet 22. At this time, the height adjustment step is completed.

[0053] After the detection port of the air flow meter 51 is aligned with the air outlet 22, the air flow data detection step and the height adjustment step are repeated until the air flow data detection is completed for all rings on the filter bag 9.

[0054] By comparing the airflow at various locations within a single ring segment on filter bag 9, if the airflow at a certain location is significantly higher than that at other locations, it can be determined that the location is damaged; if the airflow at a certain location is significantly lower than that at other locations, it can be determined that the location is blocked.

[0055] Take the average airflow rate at each position within a single ring section on filter bag 9, and compare the differences between the average airflow rates of each ring section on filter bag 9. The difference in airflow rate between adjacent ring sections on filter bag 9 should be the same. When the average airflow rate of a certain ring section on filter bag 9 deviates, it can be determined that the ring section is damaged or blocked.

[0056] Example 2:

[0057] Example 2 is basically the same as Example 1, except that:

[0058] The spray plate 2 includes multiple spray pipes 21 and a plate body 24. The plate body 24 is a circular structure and is horizontally positioned inside the bag cage 1. The side wall of the plate body 24 is clearance-fitted with the inner wall of the bag cage 1. The bottom of the plate body 24 is fixedly connected to the piston rod of the lifting mechanism 3. The connection point between the plate body 24 and the lifting mechanism 3 is located at the rotation center of the spray plate 2. Multiple spray pipes 21 are evenly arranged circumferentially inside the plate body 24. The air inlets 23 of the multiple spray pipes 21 pass through the side wall of the plate body 24 and are connected to the atmosphere. The two arc-shaped slides 41 are vertically connected through grooves. The radius of the arc-shaped slide 41 is larger than the radius of the bag cage 1; the detection device 5 includes an air flow meter 51, a limiting plate 52, and a connecting rod 53. The limiting plate 52 is located directly above the arc-shaped slide 41, and the diameter of the limiting plate 52 is larger than the width of the arc-shaped slide 41. A threaded hole 54 is formed on the limiting plate 52 in the vertical direction. The connecting rod 53 is a threaded rod, and the top of the connecting rod 53 passes through the threaded hole 54 and is threadedly connected to the limiting plate 52. The top of the air flow meter 51 is fixedly connected to the bottom of the connecting rod 53. A cavity 25 is formed in the middle of the spray plate 2. The bottom is connected to the air supply device 10 via an air inlet hose 26. Multiple blowpipes 21 are evenly arranged circumferentially on the side wall of the cavity 25. The air inlet 23 of each blowpipe 21 is located on the side wall of the cavity 25, and the air outlet 22 of each blowpipe 21 passes through the side wall of the blowpipe disc 2 and connects to the atmosphere. Each blowpipe 21 has a tapered tube structure, and the diameter of the air inlet 23 is larger than the diameter of the air outlet 22. The bag cage 1 is a cylindrical cage woven from a set of steel bars. The bag cage 1 includes multiple longitudinal ribs 11 and multiple ring ribs 12, with the longitudinal ribs 11 fixed vertically. The lifting mechanism 3 is set on the ground 6. Multiple longitudinal ribs 11 are evenly arranged in the circumferential direction of the lifting mechanism 3. The distance between the multiple longitudinal ribs 11 and the lifting mechanism 3 is equal to the radius of the ring ribs 12. Multiple ring ribs 12 are evenly arranged in the horizontal direction from top to bottom between the multiple longitudinal ribs 11. The outer circumference of the multiple ring ribs 12 is fixedly connected to each of the longitudinal ribs 11. The air outlet 22 of the blow pipe 21 is set directly opposite the gap between the longitudinal ribs 11. The lifting mechanism 3 is a telescopic hydraulic cylinder. The piston rod of the lifting mechanism 3 is fixedly connected to the bottom of the blow plate 2. The piston seat of the lifting mechanism 3 is fixedly set on the floor 6 in the vertical direction.

[0059] During the use of this design:

[0060] A turntable 4 is set directly above the bag cage 1. Two arc-shaped slides are opened on the turntable 4. A detection device 5 is set in each of the two arc-shaped slides. In the air flow data detection step, when the detection device 5 slides in the arc-shaped slide, the air flow meter 51 set on the detection device 5 rotates along the outer circumference of the bag cage 1.

[0061] The limiting plate 52 in the detection device 5 is threadedly engaged with the connecting rod 53. During the height adjustment step, when the connecting rod 53 is rotated, the connecting rod 53 drives the air flow meter 51 to move up and down relative to the limiting plate 52.

[0062] Example 3:

[0063] Example 3 is basically the same as Example 2, except that:

[0064] The detection system also includes a pressure plate 7, which is disposed between the turntable 4 and the bag cage 1; the detection system also includes a pressure ring 8, which is sleeved on the bag cage 1, and the inner wall of the pressure ring 8 is clearance-fitted with the outer wall of the bag cage 1, and the height of the bag cage 1 is less than or equal to the length of the filter bag 9.

[0065] During the use of this design:

[0066] After the filter bag 9 is fitted onto the bag cage 1, the pressure plate 7 is placed on top of the filter bag 9 and the bag cage 1. At this time, the pressure plate 7 is pressed tightly against the top of the filter bag 9 and the bag cage 1. After the pressure plate 7 presses the filter bag 9 tightly onto the top of the bag cage 1, the pressure ring 8 is fitted onto the bag cage 1 and moved to the bottom of the bag cage 1. At this time, the pressure ring 8 presses the open side of the filter bag 9 tightly, so that the filter bag 9 is sealed with the floor 6, preventing the high-pressure air ejected from the blow pipe 21 from leaking and causing insufficient airflow through the filter bag 9.

[0067] Example 4:

[0068] Example 4 is basically the same as Example 3, except that:

[0069] The lifting mechanism 3 is a hollow tube structure. The top of the lifting mechanism 3 is connected to the cavity 25 in the spray plate 2, and the bottom of the lifting mechanism 3 is connected to an external air source. The gas flowing out of the air source enters the cavity 25 after passing through the lifting mechanism 3, and is blown out from the air outlet 22 after passing through the spray pipe 21 on the side of the cavity 25.

[0070] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A detection system for detecting filter bag damage using the absolute flow rate method, characterized in that: The detection system includes: a bag cage (1), a blowing plate (2), a lifting mechanism (3), a turntable (4), and two detection devices (5); The bag cage (1) is vertically mounted on the floor (6). The spray plate (2) is horizontally mounted inside the bag cage (1). Multiple spray pipes (21) are evenly arranged inside the spray plate (2). The air outlets (22) of the multiple spray pipes (2) pass through the side wall of the spray plate (2) and are connected to the atmosphere. The air outlets (22) of the multiple spray pipes (2) are all positioned facing the inner wall of the bag cage (1). The air inlets (23) of the multiple spray pipes (21) are connected to the air supply device (10) through the air inlet hose (26). The bottom of the spray plate (2) is fixedly connected to the telescopic end of the lifting mechanism (3). The connection point between the lifting mechanism (3) and the spray plate (2) is located at the spray point. At the rotation center of the disc (2), the base of the lifting mechanism (3) is fixedly set on the floor (6) in the vertical direction. The turntable (4) is set directly above the bag cage (1). Two arc-shaped slides (41) are opened on the turntable (4). The center of the two arc-shaped slides (41) is set on the extension line of the central axis of the bag cage (1). A detection device (5) is set in each of the two arc-shaped slides (41). The top of the two detection devices (5) slides in cooperation with the corresponding arc-shaped slide (41). An air flow meter (51) is fixedly set on the detection device (5). The detection port (52) of the air flow meter (51) is set directly opposite the air outlet (22). The spray plate (2) includes multiple spray pipes (21) and a plate body (24). The plate body (24) is a disc structure. The plate body (24) is set in the bag cage (1) in the horizontal direction. The side wall of the plate body (24) is clearance-fitted with the inner wall of the bag cage (1). The bottom of the plate body (24) is fixedly connected to the piston rod of the lifting mechanism (3). The connection point between the plate body (24) and the lifting mechanism (3) is set at the rotation center of the spray plate (2). Multiple spray pipes (21) are evenly arranged in the plate body (24) in the circumferential direction. The air inlets (23) of the multiple spray pipes (21) pass through the side wall of the plate body (24) and are connected to the atmosphere. The two arc-shaped slides (41) are through grooves that run vertically through each other, and the radius of the arc-shaped slides (41) is greater than the radius of the bag cage (1); The detection device (5) includes an air flow meter (51), a limiting plate (52) and a connecting rod (53). The limiting plate (52) is located directly above the arc-shaped slide (41). The diameter of the limiting plate (52) is greater than the width of the arc-shaped slide (41). A threaded hole (54) is provided on the limiting plate (52) along the vertical direction. The connecting rod (53) is a threaded rod. The top of the connecting rod (53) passes through the threaded hole (54) and is threadedly connected to the limiting plate (52). The top of the air flow meter (51) is fixedly connected to the bottom of the connecting rod (53).

2. The detection system for detecting filter bag damage using the absolute flow rate method according to claim 1, characterized in that: The spray plate (2) has a cavity (25) in the middle. The bottom of the cavity (25) is connected to the air supply device through the air inlet hose (26). Multiple spray pipes (21) are evenly arranged on the side wall of the cavity (25) along the circumferential direction. The air inlet (23) of the spray pipe (21) is located on the side wall of the cavity (25). The air outlet (22) of the spray pipe (21) passes through the side wall of the spray plate (2) and is connected to the atmosphere. The spray pipe (21) has a conical tube structure. The diameter of the air inlet (23) of the spray pipe (21) is larger than the diameter of the air outlet (22).

3. The detection system for detecting filter bag damage using the absolute flow rate method according to claim 2, characterized in that: The cage (1) is a cylindrical cage made of a set of steel bars. The cage (1) includes multiple longitudinal bars (11) and multiple ring bars (12). The multiple longitudinal bars (11) are fixedly set on the ground (6) in the vertical direction. The multiple longitudinal bars (11) are evenly set in the circumferential direction of the lifting mechanism (3). The distance between the multiple longitudinal bars (11) and the lifting mechanism (3) is equal to the radius of the ring bars (12). The multiple ring bars (12) are evenly set in the horizontal direction from top to bottom between the multiple longitudinal bars (11). The outer circumference of the multiple ring bars (12) is fixedly connected to each longitudinal bar (11).

4. The detection system for detecting filter bag damage using the absolute flow rate method according to claim 3, characterized in that: The air outlet (22) of the blowpipe (21) is positioned directly opposite the gap between each longitudinal rib (11).

5. The detection system for detecting filter bag damage using the absolute flow rate method according to claim 4, characterized in that: The lifting mechanism (3) is a telescopic oil cylinder. The piston rod of the lifting mechanism (3) is fixedly connected to the bottom of the spray plate (2). The piston seat of the lifting mechanism (3) is fixedly installed on the floor (6) in the vertical direction.

6. The detection system for detecting filter bag damage using the absolute flow rate method according to claim 5, characterized in that: The detection system also includes a pressure plate (7), which is located between the turntable (4) and the bag cage (1).

7. The detection system for detecting filter bag damage using the absolute flow rate method according to claim 6, characterized in that: The detection system also includes a pressure ring (8), which is fitted onto the bag cage (1). The inner wall of the pressure ring (8) is fitted with the outer wall of the bag cage (1) with a clearance. The height of the bag cage (1) is less than or equal to the length of the filter bag (9).

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