A bag detection device based on dust concentration of dust collector and a detection method thereof

Abstract

The application relates to the technical field of atmospheric pollution prevention and treatment, and discloses a cloth bag detection device based on dust concentration of a dust remover and a detection method thereof. In order to solve the problem that external personnel cannot detect filter bag damage, a large-dust-concentration airflow in a dust removal box is sequentially purified and filtered through a cloth bag body and a first filter plate. After the large-dust-concentration airflow is filtered through the cloth bag body, the dust concentration is reduced, and the airflow can directly pass through the first filter plate and be outwardly conveyed. If the cloth bag body leaks, the large-dust-concentration airflow that has not been filtered passes through the cloth bag body and is filtered by the first filter plate. When the first filter plate is blocked due to long-time filtering, the airflow pressure in the inner cavity of the dust removal box is increased, the first filter plate is forced to move upwards and contact a first alarm switch, the first alarm switch is started, a bell is sounded, external personnel are warned that the cloth bag is damaged and needs to be repaired, and finally, the cloth bag leakage detection and alarm effect are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air pollution prevention and control, and particularly relates to a bag detection device based on dust concentration of a dust collector and a detection method thereof. BACKGROUND

[0002] As a kind of efficient gas-solid separation equipment, the core working principle of bag filter is to implement fine filtration on dust-containing gas by means of filter bag. The specific working process is as follows: under the driving of the fan, the dust-containing gas flow is continuously transported to the inside of the dust collector. In this process, the large particle dust in the gas flow will directly separate from the gas flow trajectory due to its large inertia or gravity, and fall into the ash hopper below, realizing preliminary gas-solid separation. The fine dust continues to move with the gas flow, and when they pass through the filter bag, the fiber fabric on the surface of the filter bag will play an interception role, adsorbing and adhering these fine dust on the surface of the filter bag. With the passage of time, a dust layer is gradually formed on the surface of the filter bag. With the continuous operation of the dust removal work, the dust layer on the surface of the filter bag is continuously thickened, and when it accumulates to a certain extent, the ash removal operation is needed. At this time, the pulse blowing device is used to spray high-pressure gas into the filter bag to generate a reverse airflow, which can effectively strip the dust layer on the surface of the filter bag, and the stripped dust falls into the ash hopper, thereby completing the ash removal process and ensuring the continuous and stable operation of the bag filter.

[0003] In the prior art, a patent with publication number CN212701035U proposes a pressure relief type dust collector. The dust collector mainly includes a dust collector body, an air inlet pipe, an air outlet pipe, a filter cartridge, a pressure sensor, a single-chip microcomputer, an air guide pipe, an electromagnetic valve, and an emergency filter bag. In actual use, dust-containing air enters the inside of the dust collector body through the air inlet pipe, and after being filtered by the filter cartridge, clean air is discharged from the air outlet pipe. At the same time, the pressure sensor will monitor the air pressure in the dust collector body in real time. When the detected air pressure approaches the set safety threshold, the single-chip microcomputer will quickly respond to control the electromagnetic valve on the air guide pipe to open. At this time, part of the air in the dust collector body will be introduced into the emergency filter bag and discharged after being filtered again by the emergency filter bag. The design of this emergency mechanism can timely prevent explosion and relieve pressure when the pressure in the filter cartridge dust collector is too high, effectively improving the use safety of the filter cartridge dust collector.

[0004] From the working principle of the above-mentioned pressure relief type dust collector, it can be seen that the air pressure in the filter cylinder is detected in real time, and the pressure data is used as an important basis for judging whether the filter bag is blocked. When it is detected that the filter bag is seriously blocked, the system can automatically switch to the emergency filter bag for filtering, thereby ensuring the continuity of the dust removal work. However, in actual application, this design has certain limitations. When the filter bag is damaged, the airflow input into the filter bag will directly leak out from the damaged part, causing the pressure in the filter cylinder to always fail to rise. Since the pressure sensor is based on the pressure change in the filter cylinder for monitoring, in this case, the external personnel cannot timely detect the damage of the filter bag through the change of the pressure data. This means that the smoke dust will be directly discharged without effective filtering, causing serious pollution to the atmospheric environment and posing potential threats to the ecological environment and human health. SUMMARY

[0005] The present application provides a dust collector dust concentration-based bag detection device and a detection method thereof, which has the functions of bag leakage detection and alarm, to solve the problem that external personnel cannot detect filter bag damage in the background art.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a dust collector dust concentration-based bag detection device, comprising: a dust removal box, a dust-containing airflow is input from the air inlet of the dust removal box, and a purified airflow is output from the air outlet; a partition plate is fixed in the middle of the dust removal box, and a support skeleton for supporting and limiting the bag body is installed at the bottom of the partition plate; a guide rod is fixedly installed at the top of the partition plate, and a filter plate assembly capable of detecting the dust concentration of the airflow in the bag body is sleeved on the guide rod; a detection spring is fixedly connected between the filter plate assembly and the partition plate; when the bag body is damaged, the dust-containing airflow passes through the broken part and is purified and filtered by the filter plate assembly; when the filter plate assembly is blocked, the alarm assembly is squeezed, and the alarm assembly can make the bell fixed on the top of the outside of the dust removal box sound.

[0007] Further, the first filter plate assembly comprises: a first filter plate, which is equal to the filter diameter of the bag body, and the outer side thereof is movably sleeved with the inner side of the dust removal box; the first alarm assembly comprises: a first alarm switch, which is fixed on the inner side of the dust removal box and located above the first filter plate, and the first alarm switch is pressed to realize the connection of the bell.

[0008] Further, the second filter plate assembly comprises: a synchronous pressing plate movably sleeved on the outer side of the guide rod, a limiting nut being threadedly connected to the top of the guide rod and located above the synchronous pressing plate; a connecting seat being fastened to the top of the synchronous pressing plate and located above the opening of the support framework, a connecting ring frame being movably sleeved on the inner side of the connecting seat, a locking rod being installed on the inner side of the connecting ring frame and being pulled outward by a locking tension spring, and an arc-shaped ring groove being formed in the inner side of the connecting seat, so that the upstroke resistance of the locking rod is increased when the locking rod abuts against the arc-shaped ring groove; and a second filter plate being movably sleeved on the inner top of the support framework, and the surface of the second filter plate being connected to the connecting ring frame through a connecting rod.

[0009] Further, the connecting seat is in a cylindrical shape with a through hole in the middle, and a concave tapered inclined surface is arranged on the inner top of the connecting seat.

[0010] Further, the dust removal tank is fixedly installed with a gas storage tank on the outer side, the gas storage tank is communicated with a gas injection pipe through an electromagnetic valve, and the gas injection pipe is coaxially arranged with the bag body.

[0011] Further, a step block is arranged on the outer side of the gas injection pipe and located above the connecting seat, a stop cylinder is movably and sealingly sleeved on the outer side of the step block, a stop tension spring is arranged between the step surface of the gas injection pipe and the stop cylinder, and a damping hole is formed in the outer step surface of the gas injection pipe; and a gas discharge hole is formed in the bottom end of the gas injection pipe, and a check valve is arranged in the gas discharge hole and the inner cavity of the gas injection pipe.

[0012] A detection method of a bag detection device based on dust concentration of a dust remover, comprising the following steps:

[0013] S1, the dust-containing airflow is transported to the air inlet by the fan, and the dust-containing airflow enters the dust removal tank for purification;

[0014] S2, after the high-concentration dust-containing airflow is purified by the bag body, the output pure air passes through the filter plate assembly and is finally discharged from the air outlet;

[0015] S3, if the bag body is damaged, the high-concentration dust-containing airflow will only be filtered by the filter plate assembly; when the filter plate assembly is blocked, it is affected by the air pressure in the dust removal tank, so that it extrudes the alarm assembly; after the alarm assembly is pressed, the electric bell connected thereto will sound, thereby warning the external personnel that the bag body is damaged and needs to be replaced.

[0016] The present application has the following advantages:

[0017] The bag detection device based on dust concentration of a dust remover and the detection method thereof provided by the present application aim to realize detection and timely alarm of the leakage of the bag body through a reasonable filtering process and a pressure monitoring mechanism.

[0018] In actual operation, the airflow containing high concentration of dust is introduced into the dust removal box. These airflow with high dust concentration is sequentially purified and filtered through the bag body and the first filter plate, and the filter diameters of the bag body and the first filter plate are consistent. When the airflow normally passes through the bag body, the bag body can effectively intercept most of the dust particles in the airflow, thereby reducing the dust concentration in the airflow. After the preliminary filtration of the bag body, the dust content of the airflow is greatly reduced, and at this time the airflow can directly pass through the first filter plate more smoothly and be further transported outward to the subsequent processing link.

[0019] When the bag body leaks, the airflow with high concentration of dust that has not been effectively filtered by the bag body will directly pass through the leakage site, and then these airflows containing a large amount of dust will reach the first filter plate. The first filter plate needs to undertake part of the filtering task that should be completed by the bag body, resulting in a sharp increase in its filtering load. With the passage of time, the dust particles will continuously accumulate on the surface and in the pores of the first filter plate in the process of filtering the airflow with high concentration of dust for a long time, eventually causing the clogging phenomenon.

[0020] When the first filter plate is clogged, the airflow input in the inner cavity of the dust removal box is hindered, and the airflow pressure increases accordingly. This pressure change will generate an upward force on the first filter plate, forcing the first filter plate to overcome its own gravity or other constraint forces to move upward. When the first filter plate moves upward to a specific position, it will contact the pre-set first alarm switch. Once the first alarm switch is triggered and started, the internal circuit will be connected, thereby causing the electric bell connected thereto to emit a loud sound. This sound can quickly attract the attention of external personnel, play a warning role, and prompt the operator that the bag body may have been damaged and needs to be repaired and maintained in time to avoid problems such as reduced dust removal efficiency and excessive dust emission due to bag leakage. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which constitute a part of this specification, illustrate embodiments of the present disclosure and serve to explain the principles of the present disclosure.

[0022] The present disclosure can be understood more readily by reference to the following detailed description, taken in connection with the accompanying drawings, and wherein:

[0023] Figure 1 is a schematic view of the overall external three-dimensional structure of the present application;

[0024] Figure 2 is a schematic view of the internal planar cross-sectional view of the first embodiment of the present application;

[0025] Figure 3 is a schematic view of the internal planar cross-sectional view of the first embodiment of the present application; Figure 2 is an enlarged structural schematic view of the F site in the middle;

[0026] Figure 4It is the internal three-dimensional structure schematic view of the second embodiment of the present application;

[0027] Figure 5 It is the position and three-dimensional structure schematic view of each part on the partition plate in the second embodiment of the present application;

[0028] Figure 6 It is the external plane and internal sectional view contrast structure schematic view of the cloth bag body in the second embodiment of the present application;

[0029] Figure 7 It is Figure 6 It is the enlarged structure schematic view of the part at E in the middle;

[0030] Figure 8 It is the internal three-dimensional structure schematic view of the connecting seat in the second embodiment of the present application;

[0031] Figure 9 It is the position and connection schematic view between the partition plate and the synchronous pressing plate in the second embodiment of the present application.

[0032] In the figure: 1, dust removal box; 1001, air inlet; 1002, air outlet; 2, air storage tank; 3, air injection pipe; 300, exhaust hole; 301, check valve; 302, damping hole; 4, electric bell; 5, partition plate; 6, support framework; 7, cloth bag body; 8, guide rod; 800, detection spring; 801, limiting nut; 9, first filter plate; 10, first alarm switch; 11, synchronous pressing plate; 12, connecting seat; 13, second filter plate; 14, connecting ring frame; 15, locking rod; 150, locking tension spring; 16, second alarm switch; 17, stop cylinder; 170, stop tension spring. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0034] Embodiment one, please refer to Figure 1 As can be seen, the dust removal box 1 can be placed at the required position by the four legs, the air inlet 1001 for conveying the dust-containing air flow into the cavity of the dust removal box 1 is fixedly installed at the bottom of the left side of the dust removal box 1, and the purified air is discharged downward to the next process or outward according to the air outlet 1002 fixedly installed at the top of the right side of the dust removal box 1 after the dust-containing air flow is purified in the interior of the dust removal box 1.

[0035] According to Figure 4It can be seen that the middle part of the inside of the dust removal box 1 is fixedly connected with a partition plate 5, and the bottom of the partition plate 5 is provided with a support framework 6 which is fastened by bolts. The support framework 6 is in the shape of a cylindrical cage, and the number of the support framework 6 is generally multiple, and the multiple support frameworks 6 are arranged at equal intervals. The outer side of the support framework 6 is provided with a cloth bag body 7 which is fastened and installed by a clamp. When the air inlet nozzle 1001 delivers the dust-containing airflow into the dust removal box 1 and below the partition plate 5, the dust-containing airflow in the inner cavity of the dust removal box 1 is filtered by the cloth bag body 7, and the purified air is finally discharged outward from the air outlet nozzle 1002.

[0036] But in the actual application process, due to the long-term use of the cloth bag body 7, the local fiber of the cloth bag is damaged and the strength is reduced, which finally leads to tearing. This will make the airflow not filtered and directly pass through the rupture. In order to prevent such problems, with reference to Figure 2 and Figure 3 It can be seen that the top of the partition plate 5 is fixedly installed with a guide rod 8, and the shape of the guide rod 8 is a cylindrical rod. Generally, the number of the guide rod 8 is four, which are respectively located near the four corners of the partition plate 5. The outer side of the guide rod 8 is movably sleeved with a first filter plate 9, and the first filter plate 9 is guided by the guide rod 8 and reciprocates up and down. The filter diameter of the first filter plate 9 is equal to that of the cloth bag body 7. Under normal conditions, the airflow filtered by the cloth bag body 7 can directly pass through the first filter plate 9. The first filter plate 9 and the partition plate 5 are fixedly connected with a detection spring 800 which is located outside the guide rod 8. The inside of the dust removal box 1 is fixedly installed with a first alarm switch 10 which is located above the first filter plate 9. Under normal conditions, the first filter plate 9 is below the first alarm switch 10 under the free length of the detection spring 800. In this process, the airflow passing through the cloth bag body 7 can directly pass through the first filter plate 9, so it will not push the first filter plate 9 to move upward.

[0037] But the cloth bag body 7 will be broken after a long time of work, which leads to the dust-containing airflow not filtered and directly passing through the cloth bag body 7. But since the filter diameter of the first filter plate 9 is consistent with that of the cloth bag body 7, the dust-containing airflow passing through the cloth bag body 7 is filtered by the first filter plate 9, which can still guarantee the purification of the dust-containing airflow. But with the passage of time, the first filter plate 9 will also be blocked due to long-term filtering, which leads to the pressure below the first filter plate 9 starting to increase.

[0038] With the increase of the airflow pressure, the first filter plate 9 tends to move upward, until the first filter plate 9 contacts the first alarm switch 10. The first alarm switch 10 is pressed to be turned on, which makes the connected bell 4 start to work. As shown in Figure 1 The bell 4 is fixedly installed on the outside top of the dust removal box 1. When the bell 4 starts to work, it will emit continuous sound to alert external personnel that the cloth bag body 7 in the dust removal box 1 is broken and needs to be repaired and replaced.

[0039] From the above, it can be seen that the first filter plate 9 is replaced by the synchronous pressing plate 11, and the guide rod 8 is threadedly connected with the limiting nut 801 above the synchronous pressing plate 11. Unlike the first embodiment, in the normal state, the synchronous pressing plate 11 is pushed by the detection spring 800 and abuts against the limiting nut 801. The first alarm switch 10 is replaced by the second alarm switch 16, which is fixed to the top of the partition plate 5 and located below the synchronous pressing plate 11. Only when the synchronous pressing plate 11 is lowered and presses the second alarm switch 16, the second alarm switch 16 is connected and the electric bell 4 connected thereto emits a sound.

[0040] The second embodiment is another detection scheme in the first embodiment. Although the first filter plate 9 in the first embodiment can perform secondary purification after the bag body 7 is damaged to ensure that the output air is relatively pure, when only one bag body 7 is damaged, the dust-containing airflow will enter the area between the partition plate 5 and the first filter plate 9 from the damaged part, causing the first filter plate 9 to eventually be blocked and contact the first alarm switch 10, and the electric bell 4 to alarm. In actual application, there are multiple bag bodies 7, and when one is damaged, the other bag bodies 7 can still perform normal filtering work, which causes the first filter plate 9 to be forced to quickly contact the first alarm switch 10 when one bag body 7 is damaged. When the electric bell 4 alarms, maintenance is needed, which will cause the air purification process to be interrupted, greatly reducing the work efficiency. The second embodiment aims to solve such problems. In order to achieve replacement when the number of damaged bag bodies 7 reaches the necessary replacement threshold, the device is stopped for replacement, thereby reducing the downtime frequency when the device is working.

[0041] From Figure 5 and Figure 9 It can be seen that the first filter plate 9 movably mounted on the guide rod 8 is replaced by the synchronous pressing plate 11, and the guide rod 8 is threadedly connected with the limiting nut 801 above the synchronous pressing plate 11. Unlike the first embodiment, in the normal state, the synchronous pressing plate 11 is pushed by the detection spring 800 and abuts against the limiting nut 801. The first alarm switch 10 is replaced by the second alarm switch 16, which is fixed to the top of the partition plate 5 and located below the synchronous pressing plate 11. Only when the synchronous pressing plate 11 is lowered and presses the second alarm switch 16, the second alarm switch 16 is connected and the electric bell 4 connected thereto emits a sound.

[0042] From Figure 5 and Figure 6 It can be seen that the synchronous pressing plate 11 has a connecting seat 12 fastened by bolts and located above the opening of the support framework 6, and the number of connecting seats 12 corresponds to the number of support frameworks 6. From Figure 6 and Figure 8As can be seen, the connecting seat 12 is a cylindrical shape through the middle, and the inner side top of the connecting seat 12 is provided with an inner concave tapered slope. The inner side top of the support framework 6 movably fits the second filter plate 13, which is the same as the first filter plate 9 in the first embodiment, and has the same filter diameter as the cloth bag body 7 to detect whether the cloth bag body 7 is damaged. Since each support framework 6 top is provided with a corresponding second filter plate 13, each second filter plate 13 will also detect the cloth bag body 7 below it. The surface side of the second filter plate 13 has a connecting ring frame 14 connected by a connecting rod, the connecting ring frame 14 is annular and located above the support framework 6, and the outer side of the connecting ring frame 14 is in a fitted relationship with the inner side of the connecting seat 12. The inner side of the connecting ring frame 14 movably installs a locking rod 15 in the radial direction thereof, and a locking tension spring 150 is connected between the locking rod 15 and the inner side of the connecting ring frame 14, which is pulled by the locking tension spring 150, forcing the locking rod 15 to always have a tendency to move away from the middle. Figure 6 and Figure 8 As shown, the inner side of the connecting seat 12 is provided with an arc-shaped ring groove at the bottom of the slope, and under normal circumstances, the locking rod 15 is located in the arc-shaped ring groove, and the ring groove is used to limit the initial upward movement of the connecting ring frame 14, and the resistance of the locking rod 15 from the ring groove needs to be overcome.

[0043] In actual work of the second embodiment, under normal circumstances, the synchronous pressing plate 11 is pushed upward by the detection spring 800, and the synchronous pressing plate 11 is located on the limiting nut 801, and at the same time, the locking rod 15 on the connecting ring frame 14 is located in the arc-shaped ring groove of the connecting seat 12.

[0044] When the dust-containing gas flow enters the dust removal box 1, the gas flow is preferentially purified by the cloth bag body 7; the gas flow passing through the cloth bag body 7 directly passes through the second filter plate 13, and finally is discharged from the gas outlet 1002.

[0045] When the cloth bag body 7 is damaged, the dust-containing gas flow will directly pass through the damaged position, and then the corresponding second filter plate 13 is used to filter the dust-containing gas flow, and when the second filter plate 13 is blocked after a long time of filtering, the upward pressure of the second filter plate 13 will increase, and when the upward force of the second filter plate 13 can make the locking rod 15 separate from the ring groove, the locking rod 15 will move to the inner side of the tapered slope of the connecting seat 12. Figure 6 As can be seen, the inner side top and the middle of the support framework 6 are designed to have a stepped surface, and as the second filter plate 13 continuously moves upward, it will be located on the stepped surface, thereby limiting its continuous upward movement.

[0046] After that, the locking rod 15 of the part will be resisted to the inside tapered slope of the connecting seat 12, and since the included angle between the slope and the top of the connecting seat 12 is 45°, when the locking rod 15 is resisted to the slope, it is pulled by the elastic force of the locking tension spring 150, so that the connecting seat 12 has a downward movement tendency under the influence of the slope, but since the elastic force of the detection spring 800 is relatively larger than the elastic force of a single locking tension spring 150. Therefore, when only one cloth bag body 7 is blocked, one locking rod 15 is not enough to move the synchronous pressing plate 11 downward.

[0047] When working for a long time, the cloth bag body 7 will also be damaged in succession, which will cause more second filter plates 13 to push the locking rod 15 out of the arc-shaped ring groove, and at the same time, more locking rods 15 are resisted to the slope of the connecting seat 12, forcing the connecting seat 12 to move downward with increased strength, until the synchronous pressing plate 11 moves downward and compresses the detection spring 800, and the bottom of the synchronous pressing plate 11 contacts the second alarm switch 16. When the second alarm switch 16 is turned on, the electric bell 4 connected thereto will sound, thereby warning external personnel to repair and replace the cloth bag body 7.

[0048] Finally, when the repair personnel replaces it, only needs to find the connecting ring frame 14 that is separated from the ring groove, so as to quickly judge the position of the damaged cloth bag body 7.

[0049] On the basis of the above content, combined with Figure 1 、 Figures 4-8 It can be seen that the dust removal box 1 is fixedly installed outside the gas storage tank 2, the gas storage tank 2 mainly uses air compressor and the like to store pressure, the gas storage tank 2 is communicated with the air injection pipe 3 outside through the electromagnetic valve, and the plurality of air injection pipes 3 are correspondingly installed with the plurality of cloth bag bodies 7. Generally, the cloth bag body 7 and the air injection pipe 3 are relatively coaxial. When the electromagnetic valve is turned on, the compressed air in the gas storage tank 2 can be injected from the air injection pipe 3 into the inner cavity of the cloth bag body 7, so as to realize the backflushing of the cloth bag body 7.

[0050] In actual application, in order to prevent the second filter plate 13 from being upwardly moved by mistake due to the too large backflushing pressure in the inner cavity of the cloth bag body 7, causing the locking rod 15 to be separated from the ring groove, combined with Figures 6-8As can be seen, a step block is arranged outside the jet pipe 3 and above the connecting seat 12, and a stop cylinder 17 is sealingly arranged outside the step block, when the compressed air flow in the inner cavity of the jet pipe 3 is output, the compressed air flow will flow into the sealing area between the outside of the jet pipe 3 and the inside of the stop cylinder 17, and force the stop cylinder 17 to have a downward movement tendency. Normally, a stop tension spring 170 is arranged between the step surface of the jet pipe 3 and the stop cylinder 17, and under the elastic pulling of the stop tension spring 170, the stop cylinder 17 always has an upward movement tendency, and in addition, a check valve 301 is arranged in the inner cavity of the jet pipe 3, the check valve 301 has a one-way check function, and a damping hole 302 is arranged on the outside step surface of the jet pipe 3. When the stop cylinder 17 moves upward, the air flow in the inner cavity of the stop cylinder 17 will slowly flow out of the damping hole 302, so that the upward speed of the stop cylinder 17 is reduced.

[0051] When the air flow input into the jet pipe 3 enters the stop cylinder 17, the stop cylinder 17 will move downward, and in this process, the outside of the stop cylinder 17 will be arranged on one side of the end of the locking rod 15, and the two are relatively close. At this time, since the locking rod 15 moves radially and approaches the middle of the connecting seat 12, the end thereof will be blocked by the stop cylinder 17, thereby limiting the locking rod 15 from being separated from the ring groove. As the stop cylinder 17 continuously moves downward, it will be in communication with the exhaust hole 300 arranged at the bottom end of the jet pipe 3, and the compressed air flow in the inner cavity of the stop cylinder 17 will be rapidly output into the inner cavity of the cloth bag body 7 through the exhaust hole 300. Figure 6 As can be seen, the exhaust hole 300 is also provided with a check valve 301, and the check valve 301 is used to realize the one-way flow of air in the exhaust hole 300 into the inner cavity of the cloth bag body 7, so as to avoid the unfiltered air flowing upward from the exhaust hole 300.

[0052] In actual application, when it is necessary to backflush the cloth bag body 7, the electromagnetic valve connected with the jet pipe 3 is connected, and the compressed air in the inner cavity of the jet pipe 3 flows into the stop cylinder 17, the inner cavity of the stop cylinder 17 is rapidly moved downward under pressure, and the stop tension spring 170 is stretched. In the process of the downward movement of the stop cylinder 17, after passing through the locking rod 15, the inner cavity of the stop cylinder 17 will be in communication with the exhaust hole 300, the compressed air flow in the inner cavity of the stop cylinder 17 will be rapidly output into the cloth bag body 7 through the exhaust hole 300, and the backflushing of the cloth bag body 7 is realized by using the high-pressure air flow.

[0053] At the same time, the high-pressure gas flow in the exhaust hole 300 sprays into the inner cavity of the cloth bag body 7, even if the pressure in the inner cavity of the cloth bag body 7 increases instantaneously, causing the second filter plate 13 to have a tendency to move upward under pressure, when the second filter plate 13 goes up, it will drive the locking rod 15 to move upward synchronously, and make the locking rod 15 need to separate from the ring groove. During the process of the locking rod 15 separating from the ring groove, the locking rod 15 needs to move radially along the connecting seat 12, but the end of the locking rod 15 is limited by the stop cylinder 17 and cannot move, therefore, during the cleaning stage, the stop cylinder 17 always limits the locking rod 15 from moving radially inward. During this process, the stop cylinder 17 is driven upward by the stop tension spring 170, but the air in the inner cavity of the stop cylinder 17 can only flow slowly from the damping hole 302, therefore, during the process of cleaning the cloth bag body 7, the stop cylinder 17 will always move to the side of the end of the locking rod 15, avoiding the problem that the locking rod 15 is mistakenly separated from the ring groove due to the abnormal excessive pressure caused by cleaning the cloth bag body 7 and the stop cylinder 17 moving upward too fast.

Claims

1. A bag detection device based on dust concentration of a dust collector, characterized by, Include: Dust removal tank (1), dust-containing airflow is input from the air inlet nozzle (1001) of the dust removal tank (1), and the purified airflow is output from the air outlet nozzle (1002); The partition (5) is fixed in the middle of the dust removal tank (1), and the bottom is provided with a support skeleton (6) for supporting and limiting the bag body (7); The top of the partition (5) is fixedly provided with a guide rod (8), the guide rod (8) is sleeved with a filter plate assembly capable of detecting the dust concentration of the airflow in the bag body (7), and the filter plate assembly and the partition (5) are fixedly connected with a detection spring (800); when the bag body (7) is damaged, the dust-containing airflow passes through the broken part and is purified and filtered by the filter plate assembly, and after the filter plate assembly is blocked, it will extrude the alarm assembly, and the alarm assembly can make the electric bell (4) fixed on the top of the outside of the dust removal tank (1) sound; The filter plate assembly comprises: The synchronous pressing plate (11) is movably sleeved on the outside of the guide rod (8), and the top of the guide rod (8) is threadedly connected with a limiting nut (801) located above the synchronous pressing plate (11); The connecting seat (12) is fastened on the top of the synchronous pressing plate (11) and located above the opening of the support skeleton (6), and the inside is sleeved with a connecting ring frame (14), the inside of the connecting ring frame (14) is provided with a locking rod (15) pulled outward by a locking tension spring (150), and the inside of the connecting seat (12) is provided with an arc-shaped ring groove, when the locking rod (15) reaches the arc-shaped ring groove, the upward resistance of the locking rod (15) can be increased; The second filter plate (13) is sleeved on the inside top of the support skeleton (6), and the surface of the second filter plate (13) is connected with the connecting ring frame (14) through a connecting rod; The alarm assembly comprises: The second alarm switch (16) is fixed on the top of the partition (5) and located below the synchronous pressing plate (11); The outside of the dust removal tank (1) is fixedly provided with a gas storage tank (2), the outside of the gas storage tank (2) is communicated with a gas injection pipe (3) through an electromagnetic valve, and the gas injection pipe (3) is coaxially arranged with the bag body (7); A step block is arranged on the outside of the gas injection pipe (3) and above the connecting seat (12), a stop cylinder (17) is sealingly movably sleeved on the outside of the step block, a stop tension spring (170) is arranged between the step surface of the gas injection pipe (3) and the stop cylinder (17), and a damping hole (302) is formed in the outside step surface of the gas injection pipe (3); An exhaust hole (300) is formed in the bottom end of the gas injection pipe (3), and a check valve (301) is arranged in the exhaust hole (300) and the inner cavity of the gas injection pipe (3).

2. The dust concentration based bag detection device of claim 1, wherein, The connecting seat (12) is a cylindrical shape with a through hole in the middle, and the inside top of the connecting seat (12) is provided with an inner concave conical slope.

3. A method of detecting a dust concentration based on a bag filter of a dust collector according to claim 1, characterized by, The steps include: S1, the dust-containing airflow is sent to the air inlet nozzle (1001) by the fan, and the dust-containing airflow enters the dust removal tank (1) for purification; S2, after the high-concentration dust-containing airflow is purified by the bag body (7), the pure air output passes through the filter plate assembly and is finally discharged from the air outlet nozzle (1002); S3, if the bag body (7) is damaged, it will cause the dust-containing airflow with high concentration to be filtered only by the filter plate assembly; when the filter plate assembly is blocked, it is affected by the air pressure in the dust removal box (1), so that it extrudes the alarm assembly, and after the alarm assembly is pressed, it will make the bell (4) connected therewith sound, so as to alert the external personnel that the bag body (7) is damaged and needs to be replaced.

Images