Smoke absorption device for detecting air filter

Abstract

The utility model relates to the technical field of detection equipment, and discloses a smoke absorbing device for air filter detection, which comprises a bearing platform and a smoke absorbing cover fixedly connected above the bearing platform, the shielding unit is used for defining a sealing channel for smoke to circulate between the smoke suction cover and the bearing table. According to the utility model, through the arrangement of the shielding unit, the shielding unit can be utilized to assist the detected smog airflow to be quickly sucked during detection, so that the next detection can be quickly carried out, and the problems of poor detection accuracy and low detection efficiency in the automatic detection process of the leakage point of the air filter in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to a smoke absorption device for air filter detection. Background Art

[0002] Air filter refers to air filtering device, which is a device that captures dust from gas-solid two-phase flow and purifies gas through the action of porous filter material. Leakage detection of air filter is one of the key criteria for judging whether the air filter can become a qualified product. In order to detect whether the air filter has leakage, the air filter to be tested is generally installed on the wall or plate in the normal installation method, and then the air containing smoke is passed through the air filter through a pipe. The laser generated by the laser light source covers the surface of the air filter, and the amount of smoke and the trajectory of the smoke flowing out of the air filter are observed to determine whether there is a leakage on the air filter to be tested.

[0003] Since laser is a kind of light that is very harmful to the human eye, and the current leak detection of air filters is almost always carried out with human eyes, this is very harmful to the workers. In addition, the current method of human eye observation cannot accurately judge the smoke passing through the air filter to be tested. It can only roughly distinguish which air filters have leaks and which do not, but cannot accurately judge the location and size of the leak. For this reason, the inventor applied for an invention patent named Air Filter Detection Method, System and Equipment Based on Machine Vision, with publication number CN113533162A. By setting a smoke generating device and an image recognition device on the carrier to automatically detect the filtering effect of the air filter, the efficiency and accuracy of the detection are effectively improved, and the detection results can be rendered and displayed, making the detection results more intuitive.

[0004] Although the solution designed by the inventor can automatically detect and display the leakage points of the air filter, in the actual detection process, when the smoke airflow filtered by the air filter flows upward to the smoke hood, there is an open space between the support platform and the smoke hood above the support platform, so that the light in the surrounding space may interfere with the laser irradiation effect, affecting the accuracy of the image captured by the image recognition device, thereby affecting the accuracy of the detection result; in addition, the airflow in the surrounding environment may also disturb the smoke airflow filtered by the air filter, resulting in the captured image being inconsistent with the actual filtering situation of the air filter, thereby resulting in poor accuracy of the detection result; at the same time, after each detection, it is necessary to use the smoke hood to suck out the smoke airflow filtered by the previous air filter before the next air filter can be detected, but the existing equipment cannot quickly suck out the smoke airflow, resulting in low detection efficiency. Utility Model Content

[0005] The utility model aims to provide a smoke absorption device for air filter detection, so as to solve the problems of poor detection accuracy and low detection efficiency in the process of automatic detection of air filter leakage in the prior art.

[0006] To solve the above problems, the utility model adopts the following technical solution: a smoke absorption device for air filter detection, including a supporting platform and a smoking hood fixedly connected to the top of the supporting platform, and the smoking hood is vertically slidably connected on all four sides with a shielding unit, which is used to form a sealed channel between the smoking hood and the supporting platform for smoke to flow.

[0007] The principle and beneficial effects of this solution are as follows: in this application, the smoke generating device, laser and air filter in the prior art are installed on a supporting platform, the image recognition device is fixedly connected to the bottom of the smoking hood, the smoke generated by the smoke generating device passes through the air filter, the air filter filters the smoke, the smoke airflow generated by the filtration flows upward, and the laser irradiates the smoke airflow so that the image recognition device uses machine vision to automatically detect the leakage point and the location of the leakage point.

[0008] At the same time, in the present application, since there are shielding units vertically slidably connected around the smoking hood, when the air filter is installed on the supporting platform, the shielding units can be slid to make all the shielding units slide to form a sealed channel. At this time, the space between the supporting platform and the smoking hood is separated by the shielding units, thereby preventing the light and airflow of the external environment from affecting the smoke airflow after filtering the air filter, making the detection in the present application more accurate. Of course, it should be noted that, combined with the actual application process, for example, the invention patent scheme with publication number CN113533162A applied by the inventor, since it is necessary to set a laser emitter and a laser marker and other equipment on one side of the carrier platform, in the actual application process, the laser emitter and the laser marker can be set in the sealed channel, and the shielding unit will not block the normal operation of the laser emitter and the laser marker; the laser emitter and the laser marker and other components can also be located outside the sealed channel. At this time, when performing the inspection, it is only necessary to slide the shielding unit on the side where the laser emitter and the laser marker are set upward to ensure that the bottom side of the shielding unit is located above the laser emitter or the laser marker to avoid the shielding unit from interfering with the laser emitter and the laser marker. For the shielding unit corresponding to the side of the carrier platform where the laser emitter and the laser marker are not set, it can be slid down to contact with the top surface of the carrier platform. The shielding unit can still play a certain role in shielding light, which still has a positive effect on improving the detection accuracy.

[0009] At the same time, since all the shielding units form a sealed channel, when cleaning the smoke that has been generated after completing an air filter inspection, due to the sealing effect of the sealed channel, the smoke between the smoke extraction hood and the carrier platform can be sucked away more quickly and thoroughly when the smoke is extracted using the smoke extraction hood, which can not only effectively reduce the interference of the smoke on the next air filter inspection, but also effectively improve the smoke removal efficiency, thereby effectively improving the inspection efficiency of the air filter.

[0010] Preferably, as an improvement, the shielding unit includes a counterweight cross bar, a shielding curtain and a winding roller, the winding roller is rotatably connected to the smoking hood, the shielding curtain is wound on the winding roller, and the free end of the shielding curtain is fixedly connected to the counterweight cross bar.

[0011] In this solution, the winding roller is rotatably connected to the smoking hood. When the blackout curtain needs to be released, the winding roller only needs to be rotated to release the blackout curtain. At this time, under the action of the gravity of the counterweight cross bar, the free end of the blackout curtain automatically moves downward following the counterweight cross bar, so that the blackout curtain forms a sealed channel. The structure is simple and the winding is very convenient.

[0012] Preferably, as an improvement, a support seat is fixedly connected between the bearing platform and the smoking hood, and the counterweight cross bar is slidably connected to the support seat.

[0013] In this solution, a support seat is set between the supporting platform and the smoke hood, and the support seat can be used to support and fix the smoke hood, thereby making the connection between the smoke hood and the supporting platform more stable; in addition, the counterweight cross bar is slidably connected to the support seat in this solution, so that the counterweight cross bar is more stable and precise during the vertical movement, so that the blackout curtain can better enclose a sealed channel, and the enclosed sealed channel structure is more stable and plays a role in guiding the smoke airflow.

[0014] Preferably, as an improvement, the smoking hood is connected to a driving mechanism, and the winding roller is connected to the driving mechanism.

[0015] In this solution, a driving mechanism is used to drive the winding roller to rotate, thereby automatically controlling the winding or releasing of the blackout curtain, without the need to manually rotate the winding roller, so that the degree of automation of the entire device detection is higher.

[0016] Preferably, as an improvement, the driving mechanism includes a driving motor, which is fixedly connected to one of the four winding rollers, and a driving gear is fixedly connected to the winding roller fixedly connected to the driving motor, and the other three winding rollers are fixedly connected to driven gears, and the driven gears are meshed with the driving gear or adjacent driven gears.

[0017] In this solution, a driving motor is used to drive the winding roller fixedly connected to it to rotate. When the winding roller rotates, it will drive the driving gear to rotate. Relying on the engagement of the driving gear and the driven gear or the engagement between adjacent driven gears, the remaining three winding rollers can synchronously follow the winding roller with the driving gear to rotate. Finally, all the winding rollers can be driven to rotate synchronously by using one driving motor, so that all the blackout curtains can be rolled up or released synchronously, with simple control and synchronous retraction and release.

[0018] Preferably, as an improvement, the cross-section of the support seat includes an L-shaped first limiting portion and a second limiting portion, an intermediate dividing portion is provided between the first limiting portion and the second limiting portion, the first limiting portion and the intermediate dividing portion form a first sliding groove, and the second limiting portion and the intermediate dividing portion form a second sliding groove; among two adjacent counterweight cross bars, the end of one counterweight cross bar is slidably matched with the first sliding groove, and the end of the other counterweight cross bar is slidably matched with the second sliding groove.

[0019] In this solution, by arranging a first sliding groove and a second sliding groove independently of each other on the support seat, the first sliding groove and the second sliding groove are used to provide limiting guides for the ends of adjacent counterweight cross bars respectively, so that the vertical sliding process of the counterweight cross bar is smoother, and when the counterweight cross bar slides downward to the lower limit position, the position of the counterweight cross bar is stabilized by relying on the limiting effect of the first sliding groove and the second sliding groove on the end of the counterweight cross bar, so that the blackout curtain can stably form a sealing channel, and the sealing channel can have a better sealing and blocking effect.

[0020] Preferably, as an improvement, a limiting portion is fixedly connected to the middle dividing portion, the limiting portion and the first sliding groove form a first limiting groove, and the limiting portion and the second sliding groove form a second limiting groove; among the two adjacent counterweight cross bars, the end of one counterweight cross bar is slidably matched with the first limiting groove, and the end of the other counterweight cross bar is slidably matched with the second limiting groove.

[0021] In this solution, the first limit groove and the second limit groove are used to guide the sliding of the counterweight cross bar, while also preventing the counterweight cross bar from sliding out of the first limit groove and the second limit groove during the sliding process, so that the counterweight cross bar can only slide vertically but not laterally, making the movement of the counterweight cross bar more precise, stable and smooth.

[0022] Preferably, as an improvement, a receiving groove cooperating with the counterweight cross bar is provided on the bearing platform.

[0023] In this solution, a receiving groove is provided on the supporting platform. When the counterweight cross bar moves downward to the supporting platform, it can fall into the receiving groove. The receiving groove is used to limit and stabilize the counterweight cross bar, thereby preventing the counterweight cross bar from moving randomly during the detection process and causing the shielding curtain to move. The movement of the shielding curtain may also interfere with the smoke airflow filtered by the air filter, thereby effectively improving the stability and accuracy of the detection.

[0024] Preferably, as an improvement, an auxiliary fixing unit is provided between the counterweight cross bar and the bearing platform.

[0025] In this solution, further, after the counterweight cross bar moves downward into the receiving groove, the counterweight cross bar is auxiliary fixed by using an auxiliary fixing unit, so that the counterweight cross bar can be more firmly connected to the supporting platform, so that the blackout curtain can form a sealed channel more firmly during the detection process.

[0026] Preferably, as an improvement, the auxiliary fixing unit comprises a first magnet block and a second magnet block which attract each other, the first magnet block is fixedly connected to the bottom of the counterweight cross bar, and the second magnet block is fixedly connected to the accommodating groove.

[0027] In the present solution, the first magnet block and the second magnet block that attract each other are used as auxiliary fixing units. When the first magnet block and the second magnet block are close to and in contact with each other, they can play an auxiliary fixing role for the counterweight cross bar. When a detection is completed and the blackout curtain needs to be rolled up, the blackout curtain is rolled up as the rolling roller rotates. When the force of the blackout curtain acting on the counterweight cross bar overcomes the attraction of the first magnet block and the second magnet block, the first magnet block and the second magnet block can be automatically separated without the need for switch control, etc. The structure is simple and can effectively play an auxiliary fixing role for the counterweight cross bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the first embodiment of the present utility model (the shielding curtain is not lowered).

[0029] Figure 2 This is a schematic diagram of the first embodiment of the present invention (the shielding curtain is lowered).

[0030] Figure 3 This is a schematic diagram of the connection between the driving motor and four winding rollers in the first embodiment of the utility model.

[0031] Figure 4 It is a schematic diagram of the connection between the support seat and the counterweight cross bar in the first embodiment of the utility model.

[0032] Figure 5 This is a cross-sectional view of the counterweight cross bar in the first embodiment of the utility model when it is located in the receiving groove.

[0033] Figure 6It is a schematic diagram of the connection between the support seat and the counterweight cross bar in the second embodiment of the utility model.

[0034] Figure 7 This is a cross-sectional view of the counterweight cross bar in the third embodiment of the present utility model when it is located in the accommodating groove. DETAILED DESCRIPTION

[0035] The following is further described in detail through specific implementation methods:

[0036] The figure marks in the drawings of the specification include: a supporting platform 1, a containing groove 101, a smoking hood 2, a supporting seat 3, a first limiting portion 301, a second limiting portion 302, a middle partition 303, a limiting portion 304, a counterweight cross bar 4, a shielding curtain 5, a winding roller 6, an active winding roller 601, a passive winding roller 602, a driving motor 7, a driving gear 8, a driven gear 9, a first magnet block 10, a second magnet block 11, a laser emitter 100, a laser marking machine 200, and an image recognition device 300.

[0037] Embodiment 1

[0038] This embodiment is as shown in the attached Figure 1 and Figure 2 As shown: a smoke absorption device for air filter detection, comprising a horizontally arranged supporting platform 1, a smoking hood 2 located directly above the supporting platform 1 is fixedly connected to the supporting platform 1, a smoking device in the prior art is installed in the smoking hood 2, and the smoking device can be used to suck away the smoke under the smoking hood 2. Specifically, the four corners of the top of the supporting platform 1 are fixedly connected with a vertically arranged support seat 3 by screws, and the smoking hood 2 is fixedly connected to the top of the support seat 3 by screws.

[0039] The four sides of the smoking hood 2 are vertically slidably connected with shielding units, and the four shielding units are used to form a vertical sealed channel between the smoking hood 2 and the supporting platform 1. Figure 2 and Figure 3 In this embodiment, the shielding unit includes a counterweight cross bar 4, a shielding curtain 5 and a winding roller 6, wherein the winding roller 6 is rotatably connected to the smoking hood 2 through a bearing, one end of the shielding curtain 5 is fixedly connected to the winding roller 6, and after the shielding curtain 5 is wound on the winding roller 6, its free end is fixedly connected to the counterweight cross bar 4, and the counterweight cross bar 4 slides vertically along the support seat 3. In this embodiment, in order to make the counterweight cross bar 4 slide vertically more smoothly, as shown in FIG. Figure 4As shown, the cross section of the support seat 3 includes an L-shaped first limiting portion 301 and a second limiting portion 302, and an intermediate partition portion 303 is provided between the first limiting portion 301 and the second limiting portion 302. The first limiting portion 301 and the intermediate partition portion 303 form a first sliding groove, and the second limiting portion 302 and the intermediate partition portion 303 form a second sliding groove; among two adjacent counterweight cross bars 4, the end of one counterweight cross bar 4 is slidably matched with the first sliding groove, and the end of the other counterweight cross bar 4 is slidably matched with the second sliding groove. Under the limiting and guiding action of the first sliding groove and the second sliding groove, the counterweight cross bar 4 can slide vertically more stably.

[0040] Combination Figure 2 and Figure 3 , the inhalation hood 2 is connected with a driving mechanism, and the winding roller 6 is connected with the driving mechanism. In this embodiment, the driving mechanism includes a driving motor 7 fixedly connected to the inhalation hood 2 by screws, and the output shaft of the driving motor 7 is fixedly connected to one of the four winding rollers 6. For the convenience of distinction, the winding roller 6 is referred to as the active winding roller 601 below, and the other three winding rollers 6 are passive winding rollers 602. The active winding roller 601 is fixedly connected with two active gears 8 by keys, and each passive winding roller 602 is fixedly connected with two driven gears 9. The two passive winding rollers adjacent to the active winding roller 601 are fixedly connected with two driven gears 9. One of the driven gears 9 on the roller 602 is meshed with the driving gear 8, and the other driven gear 9 is meshed with the driven gear 9 of the passive winding roller 602 facing the active winding roller 601. When the driving motor 7 drives the active winding roller 601 to rotate, relying on the meshing transmission action between the driving gear 8 and the driven gear 9 and between the driven gears 9 and the driven gears 9, the three passive winding rollers 602 can follow the active winding roller 601 to rotate synchronously, so that the blackout curtains 5 on the four winding rollers 6 can be synchronously wound or released.

[0041] In addition, if Figure 5 As shown, in this embodiment, a receiving groove 101 cooperating with the counterweight cross bar 4 is opened on the top surface of the supporting platform 1. When the counterweight cross bar 4 moves downward to the supporting platform 1, it can fall into the receiving groove 101. The receiving groove 101 can limit the counterweight cross bar 4, thereby stabilizing the positions of the four counterweight cross bars 4 so that the blackout curtain 5 can stably form a sealed channel.

[0042] In this embodiment, when testing the filtering effect of the air filter, first, the counterweight cross bar 4 is located at the upper limit position close to the smoking hood 2. At this time, the air filter in the prior art can be installed and placed on the supporting platform 1, the laser transmitter 100 and the laser marking machine 200 are located at the rear side of the supporting platform 1, and the image recognition device 300 is located above the supporting platform 1. At this time, the air filter can be started for testing, and the detection is completed using the image recognition device 300.

[0043] When the air filter inspection is completed, the driving motor 7 is used to drive the active winding roller 601 to rotate. When the active winding roller 601 rotates, the meshing transmission of the driving gear 8 and the driven gear 9 causes the three passive winding rollers 602 to rotate simultaneously, so that the shielding curtains 5 on all the winding rollers 6 are released. Under the action of the gravity of the counterweight cross bar 4, the free end of the shielding curtain 5 moves downward with the counterweight cross bar 4, so that the surrounding areas below the smoking hood 2 are blocked by the shielding curtains 5, and the four shielding curtains 5 form a sealed channel.

[0044] When the shielding curtain 5 forms a sealed passage, the smoking hood 2 is used to suck the smoke airflow generated by the air filter. Under the shielding and partitioning effect of the shielding curtain 5, the airflow of the surrounding environment cannot interfere with the smoke airflow filtered by the air filter, so that the smoke airflow generated by the air filter can be quickly sucked away by the smoking equipment installed in the smoking hood 2, thereby quickly completing a detection and effectively improving the detection efficiency of the air filter.

[0045] Embodiment 2

[0046] The difference between the second embodiment and the first embodiment is that: Figure 6 As shown, in this embodiment, a limiting portion 304 is integrally formed on the middle dividing portion 303, the limiting portion 304 and the first sliding groove form a vertically arranged first limiting groove, the limiting portion 304 and the second sliding groove form a vertically arranged second limiting groove, and among the two adjacent counterweight cross bars 4, the end of one of the counterweight cross bars 4 is slidably matched with the first limiting groove, and the end of the other counterweight cross bar 4 is slidably matched with the second limiting groove.

[0047] In this embodiment, the first limit groove and the second limit groove further limit and guide the end of the counterweight cross bar 4, so that the counterweight cross bar 4 is more stable and smooth when sliding vertically, and the counterweight cross bar 4 can only slide vertically but cannot swing horizontally, thereby preventing the counterweight cross bar 4 from moving toward the center direction above the supporting platform 1 during use, causing gaps between adjacent blackout curtains 5 and failing to form a good blocking effect.

[0048] Embodiment 3

[0049] The difference between the third embodiment and the second embodiment is that: Figure 7 As shown, in this embodiment, an auxiliary fixing unit is provided between the counterweight cross bar 4 and the supporting platform 1. The auxiliary fixing unit can be used to auxiliary fix the counterweight cross bar 4 after the counterweight cross bar 4 moves downward into the receiving groove 101, so as to avoid the counterweight cross bar 4 moving during the detection process and affecting the protection effect of the detection.

[0050] Specifically, the auxiliary fixing unit includes a first magnet block 10 and a second magnet block 11 that attract each other. The first magnet block 10 is fixedly connected to the bottom of the counterweight cross bar 4 by screws, and the second magnet block 11 is fixedly connected to the receiving groove 101 by screws. When the counterweight cross bar 4 moves downward to the receiving groove 101, the attraction between the first magnet block 10 and the second magnet block 11 can effectively ensure the stability of the position of the counterweight cross bar 4 and the shielding curtain 5 during the detection process. When the detection is completed and the generated smoke flow is sucked away, the winding roller 6 rotates to roll up the shielding curtain 5, and the shielding curtain 5 applies a pulling force to the counterweight cross bar 4 to overcome the attraction between the first magnet block 10 and the second magnet block 11, so that the first magnet block 10 and the second magnet block 11 automatically disengage and the shielding curtain 5 can be smoothly rolled up, with a simple structure and convenient operation. Of course, in this embodiment, in order to further enhance the stabilizing effect on the counterweight cross bar 4, the first magnet block 10 and the second magnet block 11 can be set as multiple pairs, and multiple first magnet blocks 10 can be arranged along the length direction of the counterweight cross bar 4.

[0051] Embodiment 4

[0052] The difference between the fourth embodiment and the first embodiment is that in the first embodiment, one driving motor 7 can be used to drive the four winding rollers 6 to rotate synchronously, so that all the shielding curtains 5 can be rolled up or released at the same time, and the consistency is good. In this embodiment, the four winding rollers 6 are divided into two groups, the two winding rollers 6 located on the left side and the rear side above the support platform 1 form a sealing group, and the two winding rollers 6 located on the front side and the right side above the support platform 1 form a shielding group, and the sealing group and the shielding group are respectively provided with a driving motor 7.

[0053] In actual application, after the air filter is installed on the supporting platform 1, the driving motor 7 corresponding to the shielding group is started first, so that the two winding rollers 6 in the shielding group rotate at the same time and the shielding curtains 5 on the right and front sides of the supporting platform 1 are lowered, and then the air filter is turned on for filtering detection. At this time, the two shielding curtains 5 are used to shield the front and right sides of the air filter. On the one hand, the influence of ambient light on the detection imaging is reduced, and on the other hand, the interference of ambient air flow on the smoke airflow generated by the air filter can be reduced, thereby improving the accuracy of the detection; when the air filter detection is completed, another driving motor 7 is used to drive the two winding rollers 6 of the sealing group to rotate, so that the shielding curtains 5 corresponding to the sealing group are lowered. At this time, the four shielding curtains 5 form a sealed channel, thereby assisting the smoking hood 2 to quickly absorb the smoke airflow generated by the air filter, effectively improving the detection efficiency.

[0054] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A smoke absorption device for air filter detection, comprising a support platform and a smoke hood fixedly connected to the support platform, characterized in that: The four sides of the smoking hood are vertically slidably connected with shielding units, and the shielding units are used to form a sealed channel for smoke to flow between the smoking hood and the supporting platform.

2. The smoke absorption device for air filter detection according to claim 1, characterized in that: The shielding unit comprises a counterweight crossbar, a shielding curtain and a winding roller. The winding roller is rotatably connected to the smoking hood, the shielding curtain is wound on the winding roller, and the free end of the shielding curtain is fixedly connected to the counterweight crossbar.

3. The smoke absorption device for air filter detection according to claim 2, characterized in that: A support seat is fixedly connected between the bearing platform and the smoking hood, and a counterweight cross bar is slidably connected to the support seat.

4. The smoke absorption device for air filter detection according to claim 3, characterized in that: The smoking hood is connected with a driving mechanism, and the winding roller is connected with the driving mechanism.

5. The smoke absorption device for air filter detection according to claim 4, characterized in that: The driving mechanism includes a driving motor, which is fixedly connected to one of the four winding rollers, and a driving gear is fixedly connected to the winding roller fixedly connected to the driving motor, and the other three winding rollers are fixedly connected to driven gears, which are meshed with the driving gear or adjacent driven gears.

6. The smoke absorption device for air filter detection according to claim 3, characterized in that: The cross-section of the support seat includes a first L-shaped limiting portion and a second limiting portion, an intermediate partition portion is provided between the first limiting portion and the second limiting portion, the first limiting portion and the intermediate partition portion form a first sliding groove, and the second limiting portion and the intermediate partition portion form a second sliding groove; among two adjacent counterweight cross bars, the end of one counterweight cross bar is slidably matched with the first sliding groove, and the end of the other counterweight cross bar is slidably matched with the second sliding groove.

7. The smoke absorption device for air filter detection according to claim 6, characterized in that: A limiting portion is fixedly connected to the middle dividing portion, the limiting portion and the first sliding groove form a first limiting groove, and the limiting portion and the second sliding groove form a second limiting groove; among the two adjacent counterweight cross bars, the end of one counterweight cross bar is slidably matched with the first limiting groove, and the end of the other counterweight cross bar is slidably matched with the second limiting groove.

8. A smoke absorption device for air filter detection according to any one of claims 2 to 7, characterized in that: The bearing platform is provided with a receiving groove matched with the counterweight cross bar.

9. The smoke absorption device for air filter detection according to claim 8, characterized in that: An auxiliary fixing unit is provided between the counterweight cross bar and the bearing platform.

10. The smoke absorption device for air filter detection according to claim 9, characterized in that: The auxiliary fixing unit includes a first magnet block and a second magnet block that attract each other, the first magnet block is fixedly connected to the bottom of the counterweight cross bar, and the second magnet block is fixedly connected to the accommodating groove.

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