A longitudinal movement type partitioned filter bag detection system

Abstract

A longitudinal movement type partitioned filter bag detection system, comprising a bottom plate, a cage and an annular detection device. The bottom of the cage is fixedly connected to the top of the bottom plate. An annular detection device is sleeved outside the cage. The annular detection device is in sliding fit with the cage up and down. A gap for installing a filter bag is provided between the annular detection device and the cage. The filter bag is sleeved outside the cage. The annular detection device includes a plurality of flow detection units with the same structure. The plurality of flow detection units are arranged along the circumference. The sides of two adjacent flow detection units are fixedly connected. An air vent is provided on the bottom plate, and the air vent is communicated with the inside of the cage. This design can not only quickly detect the damage of the filter bag, but also accurately locate the damaged position of the filter bag.

Description

Technical Field

[0001] The present invention relates to a detection device, in particular to a longitudinally moving partitioned filter bag detection system, which is specifically applicable to the detection of damaged filter bags in bag filters. Background Art

[0002] At present, during the production and use process of thermal power plants, waste gas containing a large amount of chemical substances and particulate matter needs to be discharged, and filter bags are required to filter the waste gas. Currently, due to the excellent properties of aramid fibers such as ultra-high strength, high temperature resistance, acid and alkali resistance, and a long service life, aramid needle felt filter bags are mainly used for actual industrial waste gas filtration. However, the filter bags need to work continuously under high temperature conditions for a long time. During this process, the high temperature in the flue gas will cause a certain degree of oxidation of the filter bags, which will further age and fatigue the materials and affect the filtration performance; the filter bags are continuously in contact with the chemical substances in the flue gas, and the acid-base substances in the flue gas will cause a certain degree of corrosion to the filter bags; at the moment of flue gas discharge, high-temperature water vapor contacts the surface of the filter bags to produce a condensation phenomenon, and at the same time, the condensation on the filter bags combines with the dust in the flue gas to produce hard-to-remove clots, affecting the dust cleaning efficiency; moreover, during the process of cleaning the filter bags with a spray gun, the high-speed compressed gas contacts the filter bag body, which will also accelerate the wear of the filter bag fabric fibers, resulting in deformation of the filter bags and causing a certain degree of physical fatigue of the filter bags. Since the filter bags will be damaged to varying degrees under the influence of various factors, a device that can detect the loss condition of the filter bags, detect the damaged position and degree of the filter bags, and then repair the filter bags that meet the repair standards, improve the utilization rate of the filter bags, and save factory costs is needed.

[0003] The invention patent application with the application number 202011491697.9 and the application date of December 26, 2020 discloses a system and a detection method for detecting filter bag damage based on the charge method. By placing metal detectors on the outlet side of each filter bag, detecting the induced charge and converting it into a digital signal through signal acquisition and processing, the purpose of real-time monitoring of filter bag damage is achieved. However, it still has the following defects: this design depends on the charge magnitude carried by the dust after collision, and the detection accuracy is low; this device cannot accurately locate the damaged position of the filter bag. Summary of the Invention

[0004] The purpose of the present invention is to overcome the problem in the prior art that it is difficult to accurately detect the damage condition of the filter bags and locate the damaged position of the filter bags, and provide a longitudinally moving partitioned filter bag detection system that can quickly and accurately detect the damage condition of the filter bags and locate the damaged position of the filter bags.

[0005] To achieve the above purpose, the technical solution of the present invention is:

[0006] A longitudinal movement type partitioned filter bag detection system, the filter bag detection system comprising: a bottom plate, a cage and an annular detection device. The bottom of the cage is fixedly connected to the top of the bottom plate. An annular detection device is sleeved outside the cage. The annular detection device is in vertical sliding fit with the cage. A gap for installing a filter bag is provided between the annular detection device and the cage. The filter bag is sleeved outside the cage.

[0007] The annular detection device includes a plurality of flow detection units with the same structure. The plurality of flow detection units are arranged in a circle, and the sides of two adjacent flow detection units are fixedly connected.

[0008] An air vent is provided on the bottom plate, and the air vent is communicated with the inside of the cage.

[0009] Each flow detection unit is internally provided with an air flow channel. A flow meter is provided at the air outlet of the air flow channel. The air outlet of the air flow channel is communicated with the outside of the flow detection unit. The air inlet of the air flow channel is communicated with the inside of the detection groove. The detection groove is provided on the inner surface of the flow detection unit.

[0010] The inner surface of the flow detection unit is attached to the outer surface of the filter bag, and the inner surfaces of all flow detection units are located on the same cylindrical surface.

[0011] The opening of the detection groove faces the cage, and the depth of the detection groove is not less than 5 mm.

[0012] The inner surfaces of two adjacent flow detection units are connected, and the connection between the inner surfaces of two adjacent flow detection units is in smooth transition.

[0013] The detection groove is a square groove, and the ratio of the cross-sectional area of the opening of the detection groove to the area of the inner surface of the flow detection unit is not less than 2.

[0014] The air flow channel is an L-shaped channel, and the air outlet of the air flow channel is located at the top of the flow detection unit.

[0015] The number of the flow detection units is 3 - 20.

[0016] The cage includes a support ring and a plurality of vertically arranged support bars. The plurality of support bars are evenly arranged in a circle. The top of the support bar is perpendicularly connected to the bottom of the support ring, and the bottom of the support bar is perpendicularly connected to the top of the bottom plate. The outer diameter of the support ring is less than or equal to the inner diameter of the filter bag.

[0017] An upper support is fixedly provided above the cage. A first guiding hole is provided on the upper support. A first sliding rod is arranged in the first guiding hole. The first sliding rod can slide up and down along the first guiding hole. The bottom of the first sliding rod is fixedly connected to the annular detection device.

[0018] The first sliding rod includes a left sliding rod and a right sliding rod that are parallel to each other. The first guiding hole includes a left guiding hole and a right guiding hole. The left sliding rod is located within the left guiding hole and can slide up and down along the left guiding hole. The right sliding rod is located within the right guiding hole and can slide up and down along the right guiding hole. The left sliding rod and the right sliding rod are respectively arranged on both sides of the annular detection device. The bottom of the left sliding rod and the bottom of the right sliding rod are each fixedly connected to the outer surface of a flow detection unit.

[0019] The upper support is further provided with a second guiding hole. A second sliding rod is arranged within the second guiding hole. The second sliding rod can slide up and down along the second guiding hole. The bottom of the second sliding rod is fixedly connected to the top of the pressing plate. The pressing plate is located between the upper support and the filter cage.

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

[0021] 1. In the longitudinal movement type partition filter bag detection system of the present invention, the annular detection device is sleeved outside the filter cage and can slide up and down relative to the filter cage. At the same time, the annular detection device includes a plurality of flow detection units with the same structure. The plurality of flow detection units are arranged in a circular arrangement, and the side portions of two adjacent flow detection units are fixedly connected. When it is necessary to detect the filter bag, the filter bag is sleeved outside the filter cage, so that the filter bag is located in the filter bag installation gap between the annular detection device and the filter cage, and air is introduced into the filter bag through the air vent opened on the bottom plate. At this time, the filter bag bulges, and the outer surface of the filter bag fits against the inner surface of the flow detection unit. The inner surface of each flow detection unit forms a detection surface to detect the airflow flow filtered through the filter bag body per unit area. Subsequently, the annular detection device moves in the vertical direction to perform partition detection on the entire filter bag. If there is a damaged area on the filter bag, when the flow detection unit passes through the damaged area, the monitored flow rate will fluctuate. Through this design, the damage condition of the filter bag can be detected, and the damaged position of the filter bag can be located, which is convenient for screening out the locally damaged filter bags and repairing them. Therefore, through the vertically movable annular detection device, the damage condition of the filter bag is detected, the damaged position of the filter bag is located, the locally damaged filter bags can be screened out and repaired, the utilization rate of the filter bag is improved, and the factory cost is saved.

[0022] 2. An annular detection device is sleeved outside the cage of a longitudinal movement type partitioned filter bag detection system of the present invention, and the annular detection device can slide up and down relative to the cage. When it is necessary to detect the filter bag, control the annular detection device to rise and disengage from the cage, and then sleeve the filter bag onto the outside of the cage from the top to complete the installation of the filter bag; when the detection is completed, pull the filter bag from the top to remove the filter bag from the cage. The installation and disassembly of the filter bag are convenient; during the detection of the filter bag, only one up or down operation needs to be performed on the annular detection device, and the detection is fast and efficient, realizing the rapid installation, detection, and disassembly of the filter bag, and is suitable for occasions such as thermal power plants that require regular large-scale detection and replacement of filter bags. Therefore, in this design, the installation, disassembly, and detection of the filter bag are convenient and fast, the detection efficiency is high, and it is suitable for large-scale detection of filter bags.

[0023] 3. Detection grooves are provided on the inner surface of the flow detection unit of a longitudinal movement type partitioned filter bag detection system of the present invention. After gas is introduced into the filter bag, the filter bag expands and the outer surface of the filter bag closely adheres to the inner surface of the flow detection unit. The flow detection unit detects the gas flow filtered by the part of the filter bag facing its detection groove. When the annular detection device moves up and down, the flow detection unit sequentially detects each part of the filter bag in the vertical direction. When the flow rate monitored by a certain flow detection unit fluctuates, the position facing the detection groove on this flow detection unit is the position where the filter bag is damaged. By setting multiple flow monitoring units and providing detection grooves on the inner surface of the flow detection unit, partitioned detection can be realized, and the damage position on the filter bag can be accurately and intuitively located. Therefore, in this design, by setting multiple flow monitoring units and providing detection grooves on the inner surface of the flow detection unit, partitioned detection is realized, and the damage position on the filter bag can be accurately and intuitively located.

[0024] 4. A pressing plate is provided between the upper bracket and the cage of a longitudinal movement type partitioned filter bag detection system of the present invention. The pressing plate is used to fix the filter bag. After the gas enters the filter bag from the air inlet, the pressing plate presses the top of the filter bag tightly on the cage to prevent the upward air flow from lifting the filter bag and causing the filter bag to fall off the cage; at the same time, the top of the pressing plate is connected to the bottom of the second sliding rod, and the second sliding rod can slide up and down along the second guiding hole. Therefore, after the gas is introduced into the filter bag, the pressing plate will not shift to the side under the action of the air flow, ensuring the stability of the detection; at the same time, pulling up the second sliding rod to make the pressing plate away from the cage, there is a large space between the pressing plate and the cage at this time, which is convenient for the installation and disassembly of the filter bag. Therefore, in this design, the pressing plate can fix the filter bag well during the detection process, ensuring the stability of the detection, and at the same time, the pressing plate does not affect the installation and disassembly of the filter bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the structural schematic diagram of the present invention.

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

[0027] Figure 3 It is a schematic diagram of the annular detection device sliding up and down along the filter cage.

[0028] Figure 4 It is a schematic structural diagram of the filter cage.

[0029] Figure 5 It is a schematic structural diagram of the annular detection device.

[0030] Figure 6 It is a schematic structural diagram of the flow detection unit.

[0031] Figure 7 It is a sectional view of the flow detection unit.

[0032] Figure 8 It is a schematic structural diagram of the spring clip in the present invention.

[0033] In the figure: bottom plate 1, ventilation port 11, filter cage 2, support ring 21, support strip 22, annular detection device 3, filter bag 4 installed, flow detection unit 5, air flow channel 51, air inlet 511, air outlet 512, detection groove 52, upper support 6, first guiding hole 61, left guiding hole 611, right guiding hole 612, first sliding rod 62, left sliding rod 621, right sliding rod 622, second guiding hole 63, second sliding rod 64, pressing plate 7, spring clip 8, clamping arm 81, support 82, rotating pin shaft 83. Specific Embodiments

[0034] The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.

[0035] Refer to Figures 1 to 8 , a longitudinally moving type partitioned filter bag detection system, the filter bag detection system includes: a bottom plate 1, a filter cage 2 and an annular detection device 3, the bottom of the filter cage 2 is fixedly connected to the top of the bottom plate 1, an annular detection device 3 is sleeved outside the filter cage 2, the annular detection device 3 is slidably matched with the filter cage 2 up and down, a gap for installing the filter bag 4 is provided between the annular detection device 3 and the filter cage 2, the filter bag 4 is sleeved outside the filter cage 2, and the bottom edge of the filter bag 4 is attached to the top of the bottom plate 1;

[0036] The annular detection device 3 includes a plurality of flow detection units 5 with the same structure, the plurality of flow detection units 5 are arranged in a circle, and the sides of two adjacent flow detection units 5 are fixedly connected;

[0037] A ventilation port 11 is opened on the bottom plate 1, and the ventilation port 11 is communicated with the inside of the filter cage 2.

[0038] An air flow channel 51 is provided inside each of the flow detection units 5. A flow meter is disposed at the air outlet 512 of the air flow channel 51. The air outlet 512 of the air flow channel 51 communicates with the outside of the flow detection unit 5, and the air inlet 511 of the air flow channel 51 communicates with the inside of the detection groove 52. The detection groove 52 is formed on the inner surface of the flow detection unit 5.

[0039] The inner surface of the flow detection unit 5 is attached to the outer surface of the filter bag 4, and the inner surfaces of all the flow detection units 5 are located on the same cylindrical surface.

[0040] The opening of the detection groove 52 faces the cage 2 directly. The depth of the detection groove 52 is not less than 5 mm. The detection groove 52 needs to have a certain depth to prevent the filter bag 4 from bulging and blocking the air flow channel 51 after gas is introduced into the filter bag 4.

[0041] As Figure 5 shown, the inner surfaces of two adjacent flow detection units 5 are connected, and the connection between the inner surfaces of two adjacent flow detection units 5 has a smooth transition. The inner surface of the entire annular detection device 3 is a smooth curved surface, and the inner surface of the annular detection device 3 can better fit the outer surface of the filter bag.

[0042] As Figure 6 shown, the detection groove 52 is a square groove, and the detection groove 52 is located in the middle of the inner surface of the flow detection unit 5 to prevent gas from leaking from the side of the detection groove 52 and not entering the air flow channel 51 when the filter bag 4 bulges.

[0043] The ratio of the cross-sectional area of the opening of the detection groove 52 to the area of the inner surface of the flow detection unit 5 is not less than 2. The ratio of the cross-sectional area of the opening of the detection groove 52 to the area of the inner surface of the flow detection unit 5 should be designed as large as possible to increase the area of the filter bag 4 to be detected.

[0044] As Figure 7 shown, the air flow channel 51 is an L-shaped channel, and the air outlet 512 of the air flow channel 51 is located at the top of the flow detection unit 5.

[0045] The number of the flow detection units 5 is 3 - 20. The more the number of the flow detection units 5, the more accurate the positioning of the damaged or blocked part on the filter bag 4.

[0046] As Figure 4 shown, the cage 2 includes a support ring 21 and a plurality of vertically arranged support bars 22. The plurality of support bars 22 are arranged uniformly along the circumference. The top of the support bar 22 is vertically connected to the bottom of the support ring 21, and the bottom of the support bar 22 is vertically connected to the top of the bottom plate 1. The outer diameter of the support ring 21 is less than or equal to the inner diameter of the filter bag 4.

[0047] After the filter bag 4 is sleeved on the cage 2, in order to make the bottom of the filter bag 4 fit with the top of the bottom plate 1 and prevent gas from leaking from the opening at the bottom of the filter bag 4, a plurality of spring clips 8 are arranged on the bottom plate 1, as Figure 8 shown. The plurality of spring clips 8 are arranged along the outer circumference of the cage 2. The spring clip 8 includes a clamping arm 81 and a support 82. The end of the clamping arm 81 is hinged to the support 82 through a rotating pin shaft 83. The bottom of the support 82 is fixedly connected to the top of the bottom plate 1. A torsion spring is sleeved outside the rotating pin shaft 83, and the two free ends of the torsion spring are respectively connected to the clamping arm 81 and the support 82. The spring clip 8 is used to press the bottom of the filter bag 4 against the bottom plate 1.

[0048] An upper support 6 is fixedly arranged above the cage 2. The upper support 6 and the bottom plate 1 are relatively fixed in position. A first guiding hole 61 is formed in the upper support 6. A first sliding rod 62 is arranged in the first guiding hole 61. The first sliding rod 62 can slide up and down along the first guiding hole 61. The bottom of the first sliding rod 62 is fixedly connected to the annular detection device 3.

[0049] The first sliding rod 62 includes a left sliding rod 621 and a right sliding rod 622 which are parallel to each other. The first guiding hole 61 includes a left guiding hole 611 and a right guiding hole 612. The left sliding rod 621 is located in the left guiding hole 611 and can slide up and down along the left guiding hole 611. The right sliding rod 622 is located in the right guiding hole 612 and can slide up and down along the right guiding hole 612. The left sliding rod 621 and the right sliding rod 622 are respectively arranged on both sides of the annular detection device 3. The bottom of the left sliding rod 621 and the bottom of the right sliding rod 622 are respectively fixedly connected to the outer surface of a flow detection unit 5.

[0050] As Figure 1 shown, a second guiding hole 63 is further arranged on the upper support 6. A second sliding rod 64 is arranged in the second guiding hole 63. The second sliding rod 64 can slide up and down along the second guiding hole 63. The bottom of the second sliding rod 64 is fixedly connected to the top of the pressing plate 7. The pressing plate 7 is located between the upper support 6 and the cage 2. The pressing plate 7 can be a lead plate or other thick metal blocks with a certain mass.

[0051] The principle of the present invention is described as follows:

[0052] Using the longitudinal movement type partition filter bag detection system to detect the filter bag 4 includes the following steps:

[0053] Installing the filter bag: controlling the first sliding rod 62 and the second sliding rod 64 to rise, so that the annular detection device 3 and the pressing plate 7 are far away from the cage 2. Then, the filter bag 4 is sleeved on the cage 2. Then, controlling the second sliding rod 64 to descend, so that the pressing plate 7 fixed to the bottom of the second sliding rod 64 presses the top of the filter bag 4;

[0054] Detection: Control the first slide bar 62 to descend, so that the annular detection device 3 is sleeved on the outside of the filter bag 4 and the bag cage 2, and then the gas is introduced into the inside of the filter bag 4 through the vent 11, and the annular detection device 3 is controlled to move in the vertical direction, and the flow of the flow meter in each flow detection unit 5 is observed at the same time;

[0055] Disassembling the filter bag: After the detection is completed, stop supplying gas to the inside of the filter bag 4, and control the first slide bar 62 and the second slide bar 64 to rise, so that the annular detection device 3 and the pressure plate 7 are away from the bag cage 2, and then pull the filter bag 4 upward to separate it from the bag cage 2.

[0056] The longitudinal motion partition filter bag detection system is easy to use, has fast detection and high efficiency, and is suitable for occasions where a large number of filter bags need to be detected, such as the inspection of boiler bag dust collectors in thermal power plants. In this design, multiple flow detection units 5 detect the filter bags at the same time, which can accurately locate the damaged position of the filter bags; at the same time, the annular detection device 3 is set outside the filter bag, and the detection results are intuitively visible.

[0057] When using the detection system for detection, the standard filter bag can be detected first, the flow rate passing through each flow detection unit 5 under normal circumstances can be measured, and the detection data can be recorded.

[0058] After testing with a standard filter bag, test the used filter bag 4, analyze the test results and determine the damage of the used filter bag 4:

[0059] If during the detection process, when the annular detection device 3 passes a certain position of the filter bag, the flow rate of some flow detection units 5 decreases significantly, then the position directly facing the detection slot 52 of the flow detection unit 5 that shows the flow rate decrease is partially blocked;

[0060] If during the detection process, when the annular detection device 3 passes a certain position of the filter bag, the flow rate of some flow detection units 5 increases significantly, then the part directly facing the detection slot 52 of the flow detection unit 5 that shows the increase in flow rate is partially damaged;

[0061] If during the test, the flow rate of each flow detection unit 5 does not fluctuate significantly, but the flow rate measured by the flow detection unit 5 is significantly smaller than the test data of the standard filter bag, the filter bag as a whole is clogged and needs to be cleaned;

[0062] If during the detection process, the flow rate of each flow detection unit 5 does not fluctuate greatly, but the flow rate measured by the flow detection unit 5 is significantly larger than the detection data of the standard filter bag, it indicates that the filter bag has overall damage, such as reduced thickness, overall fiber loss, etc., and it can no longer be repaired. At this time, a new filter bag needs to be replaced.

[0063] The flow rate measured by the flow rate detection unit 5 is significantly larger than the detection data of the standard filter bag, which means that the flow rate measured by the flow rate detection unit 5 is more than 10% larger than the detection data of the standard filter bag; the flow rate measured by the flow rate detection unit 5 is significantly smaller than the detection data of the standard filter bag, which means that the flow rate measured by the flow rate detection unit 5 is more than 10% smaller than the detection data of the standard filter bag.

[0064] When detecting the used filter bag 4, first consider whether there is local damage to the used filter bag 4. If there is no local damage, then judge whether there is overall damage.

[0065] By detecting the used filter bag 4 and analyzing the detection results, comparing the trends of the flow rate distribution of each part of the filter bag 4, the damage degree of the filter bag can be distinguished and evaluated, the repairable filter bags can be screened out, the utilization rate of the filter bags can be improved, and the factory cost can be saved.

[0066] Example 1:

[0067] The filter bag detection system includes: a bottom plate 1, a cage 2, and an annular detection device 3. The bottom of the cage 2 is fixedly connected to the top of the bottom plate 1. An annular detection device 3 is sleeved outside the cage 2. The annular detection device 3 is in vertical sliding fit with the cage 2. A gap for installing a filter bag 4 is provided between the annular detection device 3 and the cage 2. The filter bag 4 is sleeved outside the cage 2, and the bottom of the filter bag 4 is in sealed fit with the top of the bottom plate 1. The annular detection device 3 includes a plurality of flow detection units 5 with the same structure. The plurality of flow detection units 5 are arranged in a circle, and the sides of adjacent two flow detection units 5 are fixedly connected. An air vent 11 is formed on the bottom plate 1, and the air vent 11 is communicated with the inside of the cage 2. A gas flow channel 51 is formed inside each flow detection unit 5. A flow meter is arranged at the air outlet 512 of the gas flow channel 51. The air outlet 512 of the gas flow channel 51 is communicated with the outside of the flow detection unit 5. The air inlet 511 of the gas flow channel 51 is communicated with the inside of a detection groove 52. The detection groove 52 is formed on the inner surface of the flow detection unit 5. The inner surface of the flow detection unit 5 is in contact with the outer surface of the filter bag 4. An upper support 6 is fixedly arranged above the cage 2. A first guiding hole 61 is formed on the upper support 6. A first sliding rod 62 is arranged in the first guiding hole 61. The first sliding rod 62 can slide up and down along the first guiding hole 61. The bottom of the first sliding rod 62 is fixedly connected to the annular detection device 3. The first sliding rod 62 includes a left sliding rod 621 and a right sliding rod 622 which are parallel to each other. The first guiding hole 61 includes a left guiding hole 611 and a right guiding hole 612. The left sliding rod 621 is located in the left guiding hole 611 and can slide up and down along the left guiding hole 611. The right sliding rod 622 is located in the right guiding hole 612 and can slide up and down along the right guiding hole 612. The left sliding rod 621 and the right sliding rod 622 are respectively arranged on both sides of the annular detection device 3. The bottom of the left sliding rod 621 and the bottom of the right sliding rod 622 are respectively fixedly connected to the outer surface of a flow detection unit 5. A second guiding hole 63 is further arranged on the upper support 6. A second sliding rod 64 is arranged in the second guiding hole 63. The second sliding rod 64 can slide up and down along the second guiding hole 63. The bottom of the second sliding rod 64 is fixedly connected to the top of a pressing plate 7. The pressing plate 7 is located between the upper support 6 and the cage 2.

[0068] A filter bag detection method specifically includes:

[0069] Step 1: Install the filter bag:

[0070] Control the first sliding rod 62 and the second sliding rod 64 to rise, so that the annular detection device 3 and the pressing plate 7 move away from the cage 2. Then, put the filter bag 4 on the cage 2, and make the bottom of the filter bag 4 fit and seal with the top of the bottom plate 1.

[0071] The second slide bar 64 is controlled to be pushed downward, so that the pressing plate 7 fixed at the bottom of the second slide bar 64 presses the top of the filter bag 4;

[0072] Step 2: Testing:

[0073] After the filter bag is installed, gas is introduced into the interior of the filter bag 4 through the vent 11;

[0074] Control the first slide bar 62 to descend, so that the annular detection device 3 descends, and during the descending process of the annular detection device 3, the flow rate detected by the flow meter in each flow detection unit 5 is recorded;

[0075] Step 3: Remove the filter bag:

[0076] After the detection is completed, stop passing gas into the filter bag 4;

[0077] Control the first slide bar 62 and the second slide bar 64 to rise, so that the annular detection device 3 and the pressing plate 7 are away from the bag cage 2;

[0078] Pull the filter bag 4 upward to separate it from the bag cage 2, and the removal of the filter bag is completed.

[0079] Embodiment 2:

[0080] Embodiment 2 is substantially the same as Embodiment 1, except that:

[0081] The opening of the detection groove 52 faces the bag cage 2, and the depth of the detection groove 52 is not less than 5 mm.

[0082] The inner surfaces of all flow detection units 5 are located on the same cylindrical surface, and the inner surfaces of two adjacent flow detection units 5 are connected; the detection groove 52 is a square groove, and the ratio of the cross-sectional area of ​​the opening of the detection groove 52 to the area of ​​the inner surface of the flow detection unit 5 is not less than 2; the air flow channel 51 is an L-shaped channel, and the air outlet 512 of the air flow channel 51 is located at the top of the flow detection unit 5; the number of the flow detection units 5 is 3-20.

[0083] Embodiment 3:

[0084] Embodiment 3 is substantially the same as Embodiment 2, except that:

[0085] The cage 2 includes a support ring 21 and a plurality of vertically arranged support bars 22. The plurality of support bars 22 are evenly arranged in a circumference. The top of the support bar 22 is vertically connected to the bottom of the support ring 21, and the bottom of the support bar 22 is vertically connected to the top of the bottom plate 1. The outer diameter of the support ring 21 is less than or equal to the inner diameter of the filter bag 4. A plurality of spring clips 8 are further arranged on the bottom plate 1. The plurality of spring clips 8 are arranged along the outer circumference of the cage 2. The spring clip 8 includes a clamping arm 81 and a support 82. The end of the clamping arm 81 is hinged to the support 82 through a rotating pin shaft 83. The bottom of the support 82 is fixedly connected to the top of the bottom plate 1. A torsion spring is sleeved outside the rotating pin shaft 83, and the two free ends of the torsion spring are respectively connected to the clamping arm 81 and the support 82. The spring clip 8 is used to press the bottom of the filter bag 4 against the bottom plate 1.

[0086] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modification or change made by those of ordinary skill in the art according to the disclosure of the present invention shall be included in the protection scope recorded in the claims.

Claims

1. A longitudinal movement type partitioned filter bag detection system, characterized in that: The filter bag detection system includes: a bottom plate (1), a cage (2), and an annular detection device (3). The bottom of the cage (2) is fixedly connected to the top of the bottom plate (1). An annular detection device (3) is sleeved outside the cage (2). The annular detection device (3) is slidably matched with the cage (2) up and down. A gap for installing a filter bag (4) is provided between the annular detection device (3) and the cage (2). The filter bag (4) is sleeved outside the cage (2); The annular detection device (3) includes a plurality of flow detection units (5) with the same structure. The plurality of flow detection units (5) are arranged in a circle, and the sides of two adjacent flow detection units (5) are fixedly connected; An air vent (11) is opened on the bottom plate (1), and the air vent (11) is communicated with the inside of the cage (2); An air flow channel (51) is opened inside each flow detection unit (5). A flow meter is provided at the air outlet (512) of the air flow channel (51). The air outlet (512) of the air flow channel (51) is communicated with the outside of the flow detection unit (5). The air inlet (511) of the air flow channel (51) is communicated with the inside of a detection groove (52). The detection groove (52) is opened on the inner surface of the flow detection unit (5); The inner surface of the flow detection unit (5) is attached to the outer surface of the filter bag (4); The opening of the detection groove (52) faces the cage (2), and the depth of the detection groove (52) is not less than 5 mm; The inner surfaces of all the flow detection units (5) are located on the same cylindrical surface, and the inner surfaces of two adjacent flow detection units (5) are connected; The detection groove (52) is a square groove, and the ratio of the cross-sectional area of the opening of the detection groove (52) to the area of the inner surface of the flow detection unit (5) is not less than 2; The air flow channel (51) is an L-shaped channel, and the air outlet (512) of the air flow channel (51) is located at the top of the flow detection unit (5).

2. The longitudinal movement type partitioned filter bag detection system according to claim 1, characterized in that: The number of the flow detection units (5) is 3 - 20.

3. The longitudinal movement type partitioned filter bag detection system according to claim 1, characterized in that: The cage (2) includes a support ring (21) and a plurality of vertically arranged support bars (22). The plurality of support bars (22) are evenly arranged in a circle. The top of the support bar (22) is perpendicularly connected to the bottom of the support ring (21), and the bottom of the support bar (22) is perpendicularly connected to the top of the bottom plate (1). The outer diameter of the support ring (21) is less than or equal to the inner diameter of the filter bag (4).

4. The longitudinal movement type partitioned filter bag detection system according to claim 1, characterized in that: Above the said cage (2), an upper bracket (6) is fixedly arranged. A first guiding hole (61) is formed on the upper bracket (6). A first sliding rod (62) is arranged in the first guiding hole (61). The first sliding rod (62) can slide up and down along the first guiding hole (61). The bottom of the first sliding rod (62) is fixedly connected with the annular detection device (3).

5. The longitudinal movement type partitioned filter bag detection system according to claim 4, wherein: The first sliding rod (62) comprises a left sliding rod (621) and a right sliding rod (622) which are parallel to each other. The first guiding hole (61) comprises a left guiding hole (611) and a right guiding hole (612). The left sliding rod (621) is located in the left guiding hole (611) and can slide up and down along the left guiding hole (611). The right sliding rod (622) is located in the right guiding hole (612) and can slide up and down along the right guiding hole (612). The left sliding rod (621) and the right sliding rod (622) are respectively arranged on two sides of the annular detection device (3). The bottom of the left sliding rod (621) and the bottom of the right sliding rod (622) are respectively fixedly connected with the outer surface of a flow detection unit (5).

6. The longitudinal movement type partitioned filter bag detection system according to claim 4, wherein: A second guiding hole (63) is further arranged on the upper bracket (6). A second sliding rod (64) is arranged in the second guiding hole (63). The second sliding rod (64) can slide up and down along the second guiding hole (63). The bottom of the second sliding rod (64) is fixedly connected with the top of a pressing plate (7). The pressing plate (7) is located between the upper bracket (6) and the cage (2).

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