A high-temperature resistant filter paper air permeability detection device and its detection method

Abstract

The present invention relates to the field of detecting the air permeability of filter paper, and discloses a high-temperature resistant filter paper air permeability detecting device and a detecting method thereof. The key points of the technical solution are as follows: A high-temperature resistant filter paper air permeability detecting device includes an upper box body and a lower box body, with a spacing between the upper box body and the lower box body; a plurality of adjusting blocks are arranged in the upper box body, and a plurality of electric heating wires are arranged on the adjusting blocks. The plurality of adjusting blocks enclose an air inlet passage. A support platform is arranged in the lower box body, and the support platform is slidably arranged in the lower box body for supporting the filter paper. The design of the present application solves the problems caused by unstable wind speed adjustment in the traditional method by precisely controlling the changes in air flow and wind speed, and combining with the real-time monitoring after the filter paper breaks, and provides a more accurate and reliable evaluation of the air permeability and durability of the filter paper.

Description

Technical Field

[0001] The present invention relates to the technical field of air permeability detection of filter paper, and particularly relates to a high-temperature resistant filter paper air permeability detection device and a detection method thereof. Background Art

[0002] As a material widely used in air and liquid filtration, the air permeability and durability of filter paper are key indicators to measure its performance. Air permeability testing is usually used to evaluate the filtration effect of filter paper under different air flow conditions, and the common method is to simulate the actual working environment by adjusting the wind speed or pressure.

[0003] First of all, in the prior art, the wind speed is usually changed by adjusting the rotation speed of the motor. In the fan system, the adjustment of the motor rotation speed usually brings an instantaneous jump in the wind speed rather than a smooth change. Even when the motor rotation speed is controlled by frequency conversion, the adjustment of the wind speed is still relatively fast, and it is difficult to achieve a slow and linearly increasing wind speed change.

[0004] In the environments where filter paper is applied, such as the automotive intake system, air conditioner filter, industrial dust removal equipment, etc., the change of air flow is usually not sudden, but gradually adjusted with the change of factors such as equipment working conditions and environmental conditions. Therefore, if the wind speed changes too fast during the test, it is impossible to truly simulate the air permeability performance of the filter paper during long-term operation.

[0005] Secondly, due to the relatively fast change of the wind speed caused by the motor speed regulation, the filter paper may reach the limit instantly rather than gradually approaching the rupture point. In this case, the rupture of the filter paper may occur within a short time window that is not recorded, resulting in the inability to accurately measure its ultimate air permeability. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a high-temperature resistant filter paper air permeability detection device and a detection method thereof, aiming to alleviate the above problems to at least a certain extent.

[0007] The above technical object of the present invention is achieved by the following technical solutions:

[0008] A high-temperature resistant filter paper air permeability detection device, comprising:

[0009] An upper box body and a lower box body, with a spacing between the upper box body and the lower box body;

[0010] A plurality of adjusting blocks arranged in the upper box body, with a plurality of heating wires provided on the adjusting blocks, and the plurality of adjusting blocks enclose an air inlet channel. A support platform is arranged in the lower box body, and the support platform is slidably arranged in the lower box body for supporting the filter paper;

[0011] The wind blade a disposed in the lower box body is rotatably disposed in the lower box body. The upper box body is provided with a wind blade b, and a rotational speed sensor is provided on the wind blade b;

[0012] The sealing channel disposed in the upper box body cooperates with the support platform;

[0013] The driving component disposed in the lower box body is used to drive the wind blade a to rotate so as to generate negative pressure in the lower box body;

[0014] The locking component disposed between the upper box body and the lower box body is used to lock the positions of the sealing channel and the support platform when there is a distance between the upper box body and the lower box body. The locking component can unlock the sealing channel and the support platform when the upper box body moves downward to the lower box body;

[0015] The adjusting component disposed between the lower box body and the adjusting block is used to move the adjusting block to reduce the diameter of the air inlet channel;

[0016] The moving component disposed between the wind blade a and the upper box body is used to drive the upper box body to move in the vertical direction.

[0017] Preferably, the locking component includes an air inlet cylinder and an air outlet cylinder connected to the upper box body. The adjusting block is disposed between the air inlet cylinder and the air outlet cylinder. A bracket is connected to the air outlet cylinder. The wind blade b is disposed on the bracket through a bearing. The rotational speed sensor is fixed on the bracket, and the sensing end of the rotational speed sensor faces the wind blade b. A chute a is jointly opened on the upper box body and the air outlet cylinder. A push rod a is slidably connected in the chute a, and a stop rod is slidably connected in the chute a. A stop groove slidably connected with the stop rod is opened on the inner side wall of the sealing channel. Spring a is provided between the push rod a and the chute a, and between the stop rod and the chute a.

[0018] Preferably, the locking component further includes a chute b opened on the lower box body. A push rod b is slidably connected in the chute b. A locking port corresponding to the chute b is opened on the side wall of the support platform. A locking rod slidably connected with the chute b is slidably connected in the locking port. Spring b is provided between the locking rod and the chute b, and between the push rod b and the chute b. A connecting rod is rotatably connected between the locking rod and the push rod b.

[0019] Preferably, the driving component includes a driving motor connected in the lower box body. A rotating shaft is connected to the driving shaft of the driving motor, and the wind blade a is disposed on the rotating shaft.

[0020] Preferably, the moving component includes a spring telescopic rod connected between the upper box body and the lower box body. A traction shaft is provided on the rotating shaft, and a traction rope is connected to the traction shaft. One end of the traction rope passes through the lower box body and is connected to the upper box body;

[0021] Wherein, the moving component moves the upper box body vertically to a predetermined position and stops after reaching the predetermined position;

[0022] The moving component further includes a turntable connected to the rotating shaft. A connecting ring is connected to the bottom of the turntable. The traction shaft is rotatably connected to the bottom of the turntable. A wedge-shaped groove is formed in the bottom of the connecting ring. A wedge-shaped strip cooperating with the wedge-shaped groove is slidably connected to the top of the traction shaft. A spring c is connected between the wedge-shaped strip and the traction shaft, and the elastic potential energy of the spring c is greater than that of the spring telescopic rod.

[0023] Preferably, before driving the blade a to rotate, the driving component first controls the moving component to move the upper box body vertically;

[0024] The driving component further includes a rotating cylinder provided on the rotating shaft. The blade a is fixed to the rotating cylinder. The rotating cylinder is connected to the rotating shaft through a bearing. A guiding groove is formed in the outer wall of the rotating cylinder, and a guiding rod cooperating with the guiding groove is connected to the rotating shaft.

[0025] Preferably, the adjusting component includes a fixing ring fixed to the bottom of the air inlet cylinder. A guide rail is formed in the bottom of the fixing ring. A guide bar slidably cooperating with the guide rail is connected to the top of the adjusting block. A guiding ring is rotatably connected to the top of the air inlet cylinder. An arc-shaped guiding opening is formed in the guiding ring. A guiding rod slidably cooperating with the arc-shaped guiding opening is connected to the bottom of the adjusting block;

[0026] Wherein, the adjusting component can adjust the position of the adjusting block when the driving component drives the blade a to rotate;

[0027] The adjusting component further includes a gear a provided on the turntable. A connecting shaft is rotatably connected to the lower box body. A gear b adapted to the gear a is connected to the bottom of the connecting shaft. A gear c is connected to the top of the connecting shaft. A gear d adapted to the gear c is connected to the outer wall of the guiding ring.

[0028] Preferably, a connecting strip is connected to the side wall of the lower box body. The connecting shaft is rotatably connected to the connecting strip. A ratchet mechanism is provided between the connecting strip and the connecting shaft. The gear a is an incomplete gear, and a spring d is provided between the guiding ring and the air outlet cylinder.

[0029] Preferably, the support platform can move towards the direction of the fan a under the negative pressure of the lower box body and the positive pressure of the upper box body;

[0030] A connecting groove is provided on the inner side wall of the lower box body, the support platform is slidably connected in the connecting groove, a spring e is connected between the connecting groove and the support platform, a positioning claw a is connected to the bottom of the support platform, a transverse groove is provided on the sealing channel, a positioning claw b is slidably connected in the transverse groove, and a spring f is connected between the positioning claw b and the transverse groove;

[0031] When the support platform moves downward to a preset position, the adjusting member synchronously adjusts the positions of a plurality of adjusting blocks in an intermittent manner, and the diameter of the air inlet channel gradually decreases according to a preset time interval a, and the distance of each decrease is a1;

[0032] A connecting frame is slidably connected to the turntable, the gear a is connected to the connecting frame, a spring g is connected between the connecting frame and the turntable, a connecting rod a is connected to the bottom of the support platform, a connecting rod b that cooperates with the connecting rod a is slidably connected to the side wall of the lower box body, a spring h is connected between the connecting rod b and the side wall of the lower box body, the connecting rod b abuts against the connecting frame, and the spring g is in a stretched state and has potential energy.

[0033] A method for detecting the air permeability of a high-temperature resistant filter paper, which is applicable to the high-temperature resistant filter paper air permeability detection device described in any one of the above, and the specific steps are as follows:

[0034] Step 1: The operator places the filter paper to be detected on the support platform, ensures that the filter paper is laid flat and has no wrinkles. After starting the equipment, the driving member drives the moving member to move the upper box body downward in the vertical direction so that it is in full contact with the lower box body. At this time, the locking member locks the sealing channel and the support platform to ensure that the filter paper is fixed and seals its periphery to prevent air leakage;

[0035] Step 2: After the upper box body reaches the lower box body, the locking member unlocks the support platform and the sealing channel. Subsequently, the driving member drives the fan a to rotate, forming a negative pressure in the lower box body. The negative pressure causes the air flow to pass through the air inlet channel, the fan b, the sealing channel, and penetrate through the filter paper into the lower box body and be discharged from the lower box body;

[0036] Step 3: As the test progresses, the adjusting member starts to drive the adjusting blocks to move inward, gradually reducing the diameter of the air inlet channel in an intermittent manner. The interval of each reduction is a, and the reduction amount is a1, so that the air flow velocity entering the upper box body gradually increases, thereby increasing the wind speed passing through the filter paper and simulating the working state of the filter paper under different conditions;

[0037] Step 4: As the air inlet channel gradually narrows, the airflow velocity through the filter paper continuously increases, and the rotational speed of impeller b correspondingly rises. The rotational speed sensor monitors the rotational speed change of impeller b in real time. When the filter paper approaches its air permeability limit, the increase in the rotational speed of impeller b gradually decreases until the filter paper ruptures, and the rotational speed of impeller b shows irregular fluctuations. The wind speed threshold can be recorded.

[0038] Step 5: When the filter paper ruptures, the support platform loses negative pressure support due to the sudden increase in air permeability and automatically resets to its initial position. At the same time, the adjustment component stops adjusting the adjustment block, maintaining the state of the air inlet channel at the moment of rupture. At this time, the test data before and after the air permeability limit of the filter paper can be saved.

[0039] Step 6: The operator can analyze the air permeability and durability data of the filter paper through the rotational speed change curve of impeller b recorded by the rotational speed sensor. After the detection is completed, the upper box body resets. The operator removes the ruptured filter paper and can replace it with a new one for the next detection.

[0040] In summary, the present invention mainly has the following beneficial effects:

[0041] This application designs a support platform and a sealing channel locking mechanism to ensure the stable fixation of the filter paper during the test, avoid air leakage, and thus improve the accuracy of the test. The negative pressure is driven by impeller a, and by gradually reducing the diameter of the air inlet channel, the air velocity is steadily increased to ensure the controllability of the wind speed change during the test. The adjustment component synchronously drives multiple adjustment blocks to precisely adjust the diameter of the air inlet channel, simulating the working state of the filter paper under different air permeability conditions. Compared with the prior art, it avoids the problem of sudden wind speed changes caused by motor speed regulation and improves the test accuracy.

[0042] During the test, when the air permeability of the filter paper approaches the limit or ruptures, the performance change is timely reflected through the change in the rotational speed of impeller b to ensure real-time monitoring and accurate evaluation of the data. In particular, after the filter paper ruptures, the support platform resets and stops adjusting the diameter of the air inlet channel, making the test data consistent and reliable. In addition, this application can record the whole process of the air permeability of the filter paper from the initial stage to rupture, avoiding data loss caused by too rapid wind speed changes, and significantly improving the reliability and repeatability of the test results.

[0043] The design of this application solves the problems caused by unstable wind speed regulation in traditional methods by precisely controlling the air flow and wind speed changes, combined with real-time monitoring after the filter paper ruptures, and provides a more accurate and reliable evaluation of the air permeability and durability of the filter paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is the overall structural schematic diagram of the present invention;

[0045] Figure 2is a top view schematic diagram of the overall structure of the present invention;

[0046] Figure 3 is Figure 2 a cross-sectional schematic diagram taken along the A-A direction in;

[0047] Figure 4 is Figure 2 a cross-sectional schematic diagram taken along the B-B direction in;

[0048] Figure 5 is Figure 3 a magnified schematic diagram of the local structure at a in;

[0049] Figure 6 is Figure 4 a magnified schematic diagram of the local structure at b in;

[0050] Figure 7 is a cross-sectional schematic diagram of the lower box body structure of the present invention;

[0051] Figure 8 is a schematic diagram of the rotating cylinder structure of the present invention;

[0052] Figure 9 is a partial cross-sectional schematic diagram of the traction shaft structure of the present invention;

[0053] Figure 10 is a schematic diagram of the adjusting block structure of the present invention;

[0054] Figure 11 is a schematic diagram of the fixed ring structure of the present invention;

[0055] Figure 12 is a schematic diagram before the reduction of the air inlet channel structure of the present invention;

[0056] Figure 13 is a schematic diagram after the reduction of the air inlet channel structure of the present invention;

[0057] Figure 14 is a schematic diagram of the blade a structure of the present invention;

[0058] Figure 15 is a schematic diagram of the ratchet mechanism structure of the present invention.

[0059] Reference numerals:

[0060] 100, upper box body; 101, lower box body; 102, adjusting block; 103, heating wire; 104, air inlet channel; 105, support platform; 106, blade a; 107, blade b; 108, rotational speed sensor; 109, sealing channel;

[0061] 200, air inlet duct; 201, air outlet duct; 202, support; 203, chute a; 204, ejector rod a; 205, retaining rod; 206, retaining groove; 207, spring a; 208, chute b; 209, ejector rod b; 210, locking port; 211, locking rod; 212, spring b; 213, connecting rod;

[0062] 300, drive motor; 301, rotating shaft; 302, rotating cylinder; 303, guiding groove; 304, guiding rod;

[0063] 400, spring telescopic rod; 401, traction shaft; 402, traction rope; 403, turntable; 404, connecting ring; 405, wedge-shaped groove; 406, wedge-shaped strip; 407, spring c;

[0064] 500, fixing ring; 501, guide rail; 502, guide bar; 503, guiding ring; 504, arc-shaped guiding port; 505, guiding rod; 506, gear a; 507, connecting shaft; 508, gear b; 509, gear c; 510, gear d; 511, connecting strip; 512, ratchet mechanism; 513, spring d;

[0065] 600, connecting groove; 601, spring e; 602, positioning claw a; 603, transverse groove; 604, positioning claw b; 605, spring f; 606, connecting frame; 607, spring g; 608, connecting rod a; 609, connecting rod b; 610, spring h. Detailed implementation mode

[0066] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0067] Refer to Figures 1-15 , a high-temperature resistant filter paper air permeability detection device, including:

[0068] The upper box body 100 and the lower box body 101, and there is a distance between the upper box body 100 and the lower box body 101;

[0069] A plurality of adjusting blocks 102 arranged in the upper box body 100, a plurality of electric heating wires 103 are arranged on the adjusting blocks 102, and the plurality of adjusting blocks 102 enclose an air inlet passage 104. A support platform 105 is arranged in the lower box body 101, and the support platform 105 is slidably arranged in the lower box body 101 for supporting the filter paper;

[0070] The wind blade a 106 disposed inside the lower box body 101 is rotatably disposed inside the lower box body 101. A wind blade b 107 is disposed inside the upper box body 100, and a rotational speed sensor 108 is disposed on the wind blade b 107;

[0071] The sealing channel 109 disposed inside the upper box body 100 is matched with the support platform 105;

[0072] The driving component disposed inside the lower box body 101 is used to drive the wind blade a 106 to rotate so as to generate negative pressure inside the lower box body 101;

[0073] The locking component disposed between the upper box body 100 and the lower box body 101 is used to lock the positions of the sealing channel 109 and the support platform 105 when there is a distance between the upper box body 100 and the lower box body 101. The locking component can unlock the sealing channel 109 and the support platform 105 when the upper box body 100 moves downward to the lower box body 101;

[0074] The adjusting component disposed between the lower box body 101 and the adjusting block 102 is used to move the adjusting block 102 to reduce the diameter of the air inlet channel 104;

[0075] The moving component disposed between the wind blade a 106 and the upper box body 100 is used to drive the upper box body 100 to move in the vertical direction;

[0076] Wherein, before driving the wind blade a 106 to rotate, the driving component first controls the moving component to move the upper box body 100 in the vertical direction to a predetermined position and stops after reaching the predetermined position;

[0077] Wherein, the support platform 105 can move towards the wind blade a 106 under the action of the negative pressure of the lower box body 101 and the positive pressure of the upper box body 100. When the support platform 105 moves downward to a preset position, the adjusting component synchronously adjusts the positions of a plurality of adjusting blocks 102 in an intermittent manner;

[0078] Wherein, the adjusting component can adjust the position of the adjusting block 102 when the driving component drives the wind blade a 106 to rotate;

[0079] By setting up the support platform 105, during detection, the operator can place the filter paper to be detected on the support platform 105. The operator can start the driving component. Before driving the wind blade a106 to rotate, the driving component can first control the moving component to move the upper box body 100 vertically to the position of the lower box body 101, and stop after the upper box body 100 moves to the position of the lower box body 101 and makes full contact with the lower box body 101. During this process, since the positions of the support platform 105 and the sealing channel 109 are locked by the set locking component, when the upper box body 100 moves downward, the sealing channel 109 on it can contact the filter paper on the support platform 105 and be inserted into the support platform 105, so as to fix the filter paper and seal between the support platform 105 and the sealing channel 109, allowing the air flow to enter the lower box body 101 only through the filter paper, thereby ensuring that the air flow will not leak from other gaps during the test and improving the accuracy of the test.

[0080] After the upper box body 100 reaches the position of the lower box body 101, the locking component unlocks the support platform 105 and the sealing channel 109, and the driving component starts to drive the wind blade a106 to rotate, creating a negative pressure in the lower box body 101. The negative pressure can suck the air in the upper box body 100 through the air inlet channel 104, the wind blade b107 and the sealing channel 109 and through the filter paper. The wind blade b107 will rotate under the action of the air flow. As the wind blade a106 rotates at a constant speed, a certain negative pressure is continuously maintained inside the lower box body 101, prompting the air flow to enter the lower box body 101 through the filter paper. At this time, the initial diameter of the air inlet channel 104 is relatively large, the air flow speed through the filter paper is relatively low, and the rotation speed of the wind blade b107 is also relatively low. Since the support platform 105 has the filter paper on it, the passing rate of the air flow is relatively low. The support platform 105 will drive the filter paper and the sealing channel 109 inserted on it to move closer to the wind blade a106 under the action of the negative pressure. The adjusting component starts to act on the adjusting block 102 to synchronously move multiple adjusting blocks 102 inward, gradually reducing the diameter of the air inlet channel 104. The reduction of the air inlet channel 104 increases the air flow speed entering the upper box body 100, resulting in a gradual increase in the wind speed through the filter paper, and the rotation speed of the wind blade b107 increases accordingly. Since the rotation speed of the wind blade a106 is constant and the negative pressure of the whole system remains stable, the increase in the wind speed is mainly caused by the change in the diameter of the air inlet channel 104. This change method can more accurately simulate the working state of the filter paper under different air permeability conditions.

[0081] Moreover, as the wind blade a106 rotates, the adjustment component synchronously drives the movement of multiple adjustment blocks 102 in an intermittent manner, causing the diameter of the air inlet channel 104 to gradually decrease according to a preset time interval a, with the distance of each decrease being a1. This way of gradually reducing the air inlet channel 104 enables the air flow velocity entering the upper box body 100 to gradually increase, ensuring the smoothness and controllability of the wind speed change. Compared with the prior art, without the need to adjust the rotation speed of the wind blade a106, by adjusting the air inlet channel 104 and monitoring the rotation speed of the wind blade b107, accurate testing of the air permeability and durability of the filter paper can be achieved. This design solves the problem of sudden wind speed changes caused by motor speed regulation in the prior art, enabling the test wind speed to be adjusted smoothly and progressively, which is more in line with the working state of the filter paper in the actual application environment.

[0082] As the test progresses, as the air inlet channel 104 gradually shrinks, the wind speed of the air flow passing through the filter paper gradually increases, and the rotation speed of the wind blade b107 changes accordingly, thereby providing real-time air permeability data. When the air permeability limit of the filter paper is gradually approached, the increase rate of the rotation speed of the wind blade b107 will gradually decrease until the air permeability limit point of the filter paper. When the filter paper reaches the air permeability limit or breaks, the rotation speed of the wind blade b107 will show irregular fluctuations, indicating that the performance of the filter paper has approached the limit or broken. Operators can judge the performance limit of the filter paper through this signal. This comprehensive test method based on the gradual reduction of the air inlet channel 104, stable negative pressure control, and rotation speed monitoring of the wind blade b107 avoids the problem of data distortion caused by sudden wind speed changes in the prior art, thereby providing a more accurate assessment of the air permeability and durability of the filter paper.

[0083] In addition, after the filter paper breaks, when the air flow passing rate of the support platform 105 increases, resulting in insufficient negative pressure generated in the lower box body 101 to continue attracting the support platform 105, the support platform 105 will reset to its initial position and stop adjusting the diameter of the air inlet channel 104. At this time, the adjustment component stops adjusting the adjustment block 102, maintaining the state of the air inlet channel 104 when the filter paper breaks, ensuring that the data during the test can be used for subsequent analysis. In addition, after the filter paper breaks, the air flow passing rate of the support platform 105 increases, so that when the negative pressure generated in the lower box body 101 is insufficient to continue attracting the support platform 105, the support platform 105 can reset and return to the initial test position. After the support platform 105 resets, the test system can judge the wind speed threshold at the time of breakage through the change in the rotation speed of the wind blade b107, and calculate the air permeability limit parameters of the filter paper in combination with the final diameter of the air inlet channel 104. This method can accurately record the air permeability change curve of the filter paper, from the initial low wind speed state to the limit air permeability, and then to the entire process of final breakage.

[0084] Meanwhile, since the diameter of the air inlet channel 104 remains unchanged after the filter paper breaks, the system can continuously monitor the rotation speed of the fan blade b107, verify the airflow characteristics after the filter paper breaks, and avoid data loss caused by too rapid changes in wind speed. This design effectively solves the problem that it is difficult for traditional methods to accurately capture the air permeability limit and the breakage timing of the filter paper, and improves the reliability and repeatability of the test results.

[0085] Furthermore, in this application, before the fan blade a106 rotates, the upper box body 100 is moved downward so that the sealing channel 109 is inserted into the support platform 105 to fix the filter paper. The main purpose is to ensure that the filter paper has been firmly fixed on the support platform 105 before negative pressure is generated in the lower box body 101, and to avoid displacement or loosening of the filter paper caused by the airflow when it is not fixed. In this way, it can be ensured that the filter paper always remains in the predetermined position, thereby avoiding inaccurate test results caused by filter paper displacement. Only after the filter paper is completely fixed, the fan blade a106 is started to rotate to generate negative pressure, ensuring that the airflow can pass through the filter paper stably and accurately, so as to perform a reliable air permeability test. This design effectively avoids the unstable factors generated when the filter paper is not fixed, ensuring the accuracy and consistency of the data during the test process.

[0086] Furthermore, after the support platform 105 is displaced downward, the adjusting component is allowed to adjust the position of the adjusting block 102 following the rotation of the fan blade a106, in order to ensure that the adjustment of the diameter of the air inlet channel 104 starts only after the filter paper is fixed. After the support platform 105 is displaced downward, the filter paper has been firmly fixed on the support platform 105, and the sealing effect between the sealing channel 109 and the filter paper has been confirmed. In this state, then start to adjust the diameter of the air inlet channel 104, which can avoid the displacement of the filter paper caused by the interference of the airflow before it is fixed, thereby ensuring the accuracy of the test data. In this way, it can be avoided that the filter paper is misoperated or affected in an unstable state, ensuring the stability and reliability of the test process.

[0087] Further, the heating wire 103 is arranged on the surface of the adjusting block 102. When the air flow passes through the heating wire 103, the heating wire 103 will convert electrical energy into heat energy, thereby increasing the temperature of the air flow. In the initial state, most of the adjusting block 102 is received in the internal space of the upper box body 100 and does not contact the air flow. As the adjusting block 102 moves, the diameter of the air intake channel gradually decreases, and the flow rate of the air flow increases. This change not only enhances the power of the air flow but also improves the heating effect of the heating wire 103 on the air flow. Although the increase in the air flow rate shortens the contact time between the air flow and the heating wire 103, due to the movement of the adjusting block 102, the exposed area of the heating wire 103 gradually increases, and the contact area between the air flow and the heating wire 103 increases accordingly. In this way, the increased contact area compensates for the influence of the shortened contact time, thereby ensuring that the heating wire 103 can effectively convert electrical energy into heat energy and significantly increase the temperature of the air flow. As the temperature of the air flow increases, the air flow can conduct a more stringent high-temperature resistance test on the filter paper when passing through the filter paper. This increase in temperature enables the air flow to simulate the actual performance of the filter paper in a high-temperature working environment when passing through the filter paper, and further examines its air permeability and high-temperature resistance characteristics. In this way, the working state of the filter paper under different air flow rates and high-temperature conditions can be accurately simulated, the change in air permeability and stability of the filter paper can be tested, and thus the evaluation accuracy of the air permeability and durability of the filter paper can be improved.

[0088] As a further solution of the present invention, the locking component includes an air inlet cylinder 200 and an air outlet cylinder 201 connected to the upper box body 100. The adjusting block 102 is arranged between the air inlet cylinder 200 and the air outlet cylinder 201. A bracket 202 is connected to the air outlet cylinder 201. The fan blade b107 is arranged on the bracket 202 through a bearing. The rotation speed sensor 108 is fixed on the bracket 202, and the sensing end of the rotation speed sensor 108 faces the fan blade b107. A sliding groove a203 is jointly opened on the upper box body 100 and the air outlet cylinder 201. A push rod a204 is slidably connected in the sliding groove a203, and a blocking rod 205 is slidably connected in the sliding groove a203. A blocking groove 206 slidably connected to the blocking rod 205 is opened on the inner side wall of the sealing channel 109. A spring a207 is provided between the push rod a204 and the sliding groove a203 and between the blocking rod 205 and the sliding groove a203;

[0089] By setting the shift lever 205, the cooperation between the shift lever 205 and the shift groove 206 can limit the sealing channel 109 to support the position of the sealing channel 109, and the purpose of locking the sealing channel 109 can be achieved. When the upper box body 100 moves downward, the ejector rod a204 can contact the lower box body 101 prior to the upper box body 100. The ejector rod a204 can move relative to the upper box body 100, and then can push against the position of the shift lever 205, causing the shift lever 205 to displace and disengage from the shift groove 206, achieving the purpose of unlocking the sealing channel 109. Specifically, when the upper box body 100 moves downward, it will drive the sealing channel 109 to move downward through the shift lever 205 and the shift groove 206. After the sealing channel 109 contacts the filter paper, it will slide along the air outlet cylinder 201. After the sealing channel 109 moves to the limit position, as the upper box body 100 continues to move, it can squeeze the filter paper and insert the filter paper onto the support platform 105, thereby sealing the air outlet cylinder 201 and the support platform 105. In this way, even when the support platform 105 moves downward under negative pressure, it will also drive the sealing channel 109 to move downward, ensuring that the air flow only reaches the lower box body 101 through the filter paper. After the filter paper ruptures and the detection work is completed, the support platform 105 drives the sealing channel 109 to reset upward, enabling the shift groove 206 on the sealing channel 109 to reach the position of the shift lever 205 again. During the upward reset movement of the upper box body 100, since the movement of the ejector rod a204 and the shift lever 205 before will cause the spring a207 to generate potential energy, the upper box body 100 first leaves the lower box body 101, and the ejector rod a204 moves relative to the upper box body 100 under the potential energy of the spring a207, releasing the restriction on the shift lever 205. The shift lever 205 can cooperate with the shift groove 206 again, and then lock the position of the sealing channel 109 again to drive the sealing channel 109 to move together when the upper box body 100 resets upward, disengaging from the support platform 105, facilitating the staff to take out the ruptured filter paper and prepare for the next detection.

[0090] As a further solution of the present invention, the locking component further includes a chute b208 opened on the lower box body 101. A ejector rod b209 is slidably connected in the chute b208. A locking port 210 corresponding to the chute b208 is opened on the side wall of the support platform 105. A locking rod 211 slidably connected to the chute b208 is slidably connected in the locking port 210. Springs b212 are provided between the locking rod 211 and the chute b208, and between the ejector rod b209 and the chute b208. A connecting rod 213 is rotatably connected between the locking rod 211 and the ejector rod b209;

[0091] By setting the ejector rod b209, when the upper box body 100 moves downward and contacts the lower box body 101, the ejector rod a204 moves to unlock the sealing channel 109. At this time, the upper box body 100 can also press the ejector rod b209, causing the ejector rod b209 to displace downward and pressing the locking rod 211 through the connecting rod 213, so that the locking rod 211 displaces and disengages from the locking port 210, and then the support platform 105 can be unlocked, enabling the subsequent operations to be carried out smoothly.

[0092] As a further solution of the present invention, the driving component includes a driving motor 300 connected inside the lower box body 101. A rotating shaft 301 is connected to the driving shaft of the driving motor 300, and the air blade a106 is arranged on the rotating shaft 301;

[0093] By setting the driving motor 300 and the rotating shaft 301 connected to its driving shaft, the air blade a106 can be driven by the rotation of the rotating shaft 301. When the driving motor 300 works, the driving shaft drives the rotating shaft 301 to rotate, thereby driving the rotation of the air blade a106, generating an air flow and forming a negative pressure inside the lower box body 101. It provides reliable support for the air permeability and durability tests of the filter paper.

[0094] As a further solution of the present invention, the moving component includes a spring telescopic rod 400 connected between the upper box body 100 and the lower box body 101. A traction shaft 401 is arranged on the rotating shaft 301, and a traction rope 402 is connected to the traction shaft 401. One end of the traction rope 402 passes through the lower box body 101 and is connected to the upper box body 100;

[0095] By setting the spring telescopic rod 400, the spring telescopic rod 400 can support the position of the upper box body 100, and using its own potential energy, a stable distance can be formed between the upper box body 100 and the lower box body 101. This distance is convenient for the operator to place and remove the filter paper on the support platform 105. When the driving motor 300 works, the rotation of the rotating shaft 301 can drive the traction shaft 401 to rotate to wind up the traction rope 402. When the traction rope 402 is wound up, it can traction the position of the upper box body 100, causing the upper box body 100 to displace downward and fully contact the lower box body 101. When the upper box body 100 is released subsequently, the driving motor 300 can be used to reverse the rotation of the rotating shaft 301, allowing the traction shaft 401 to release the traction rope 402, and the spring telescopic rod 400 to release its potential energy, enabling the upper box body 100 to reset to the origin, and thus the purpose of driving the upper box body 100 to move linearly up and down can be achieved.

[0096] As a further solution of the present invention, the moving part further includes a turntable 403 connected to the rotating shaft 301. A connecting ring 404 is connected to the bottom of the turntable 403. The traction shaft 401 is rotatably connected to the bottom of the turntable 403. A wedge-shaped groove 405 is formed at the bottom of the connecting ring 404. A wedge-shaped strip 406 cooperating with the wedge-shaped groove 405 is slidably connected to the top of the traction shaft 401. A spring c407 is connected between the wedge-shaped strip 406 and the traction shaft 401. The elastic potential energy of the spring c407 is greater than that of the spring telescopic rod 400;

[0097] By arranging the spring c407, the spring c407 can apply a force to the wedge-shaped strip 406 to squeeze the wedge-shaped groove 405, so that the wedge-shaped strip 406 and the wedge-shaped groove 405 cooperate to form a frictional force, and this friction can overcome the elastic potential energy of the spring telescopic rod 400. That is, when the rotating shaft 301 rotates, the connecting ring 404 can be rotated through the turntable 403. The rotation of the connecting ring 404 can make the traction shaft 401 rotate through the frictional force, and then the traction rope 402 is wound up to make the upper box body 100 move downward. After the position of the upper box body 100 moves downward to fully contact the lower box body 101, the continued rotation of the rotating shaft 301 can overcome the elastic potential energy of the spring c407, so that the wedge-shaped strip 406 is compressed and contracted into the traction shaft 401 by the wedge-shaped groove 405, and the follow-up movement of the connecting ring 404 and the traction shaft 401 is released, so as to achieve the purpose of moving the upper box body 100 vertically to a predetermined position and stopping after reaching the predetermined position. The purpose of this setting is to ensure that the upper box body 100 can reach the predetermined position smoothly and accurately during the movement, and can stop stably after reaching, and will not affect the subsequent rotation of the rotating shaft 301 to drive the rotation of the wind blade a106. During the test, there is no need for the staff to control the movement of the upper box body 100 and the rotation of the wind blade a106 separately. The test will be automatically carried out, thereby improving the automation degree and efficiency of the entire system. Reducing human error and operation time ensures the stability and consistency of the test process.

[0098] As a further solution of the present invention, the driving part further includes a drum 302 arranged on the rotating shaft 301. The wind blade a106 is fixed to the drum 302. The drum 302 and the rotating shaft 301 are connected by a bearing. A guiding groove 303 is formed on the outer wall of the drum 302. A guiding rod 304 cooperating with the guiding groove 303 is connected to the rotating shaft 301;

[0099] By setting the guide rod 304, in the initial state, the guide rod 304 is located at the leftmost end of the guide groove 303. When the driving motor 300 drives the rotating shaft 301 to rotate counterclockwise, the traction shaft 401 and the guide rod 304 can rotate. The guide rod 304 will slide within the guide groove 303, that is, the traction shaft 401 will rotate prior to the rotating cylinder 302 and the air blade a106. Before the guide rod 304 slides to the rightmost end of the guide groove 303, the upper box body 100 has moved downward to the position of the lower box body 101. Subsequently, the rotation of the rotating shaft 301 will cause the rotating cylinder 302 and the air blade a106 to rotate. Thus, it can be realized that before the air blade a106 rotates, the upper box body 100 moves downward to the position of the lower box body 101 to fix the filter paper in advance, avoiding the problem that the negative pressure generated by the rotation of the air blade a106 causes the unfixed filter paper to displace, and ensuring the effectiveness of fixation and sealing.

[0100] As a further solution of the present invention, the adjusting component includes a fixing ring 500 fixed to the bottom of the air inlet cylinder 200. A guide rail 501 is provided at the bottom of the fixing ring 500. A guide bar 502 slidably engaged with the guide rail 501 is connected to the top of the adjusting block 102. A guide ring 503 is rotatably connected to the top of the air inlet cylinder 200. An arc-shaped guide opening 504 is provided on the guide ring 503. A guide rod 505 slidably engaged with the arc-shaped guide opening 504 is connected to the bottom of the adjusting block 102.

[0101] By setting the guide ring 503, when adjusting the diameter of the air inlet passage 104, the guide ring 503 can be rotated. When the guide ring 503 rotates, the guide rod 505 slides along the arc-shaped guide opening 504, pushing the adjusting block 102 to move on the guide rail 501. Due to the sliding fit between the guide bar 502 and the guide rail 501, the adjusting block 102 can accurately move along a predetermined path within the air inlet cylinder 200, gradually reducing the diameter of the air inlet passage 104. Thus, the purpose of adjusting the diameter of the air inlet passage 104 by controlling the rotation angle of the guide ring 503 is achieved. In addition, during the movement of the adjusting block 102, the heating wire 103 on its surface will gradually be exposed, and the number in the air inlet cylinder 200 will gradually increase, thereby gradually increasing the heating area of the heating wire 103. This design can effectively compensate for the influence of the air flow on the heating effect of the heating wire 103 during the increase in wind speed, ensuring that the air flow can obtain uniform and stable heating when passing through the air inlet passage 104.

[0102] As a further solution of the present invention, the adjusting component further includes a gear a506 provided on the turntable 403. A connecting shaft 507 is rotatably connected to the lower box body 101. A gear b508 adapted to the gear a506 is connected to the bottom of the connecting shaft 507. A gear c509 is connected to the top of the connecting shaft 507. A gear d510 adapted to the gear c509 is connected to the outer wall of the guide ring 503.

[0103] By setting the gear a506, when the rotating shaft 301 rotates to drive the turntable 403 to rotate, the gear a506 thereon can be driven to rotate. When the upper box body 100 moves downward, the positions of the connecting shaft 507 and the gear c509 remain unchanged. The guide ring 503 moves with the upper box body 100, which can make the gear d510 approach the gear c509 until the upper box body 100 contacts the lower box body 101, and then the gear c509 can mesh with the gear d510. When the impeller starts to rotate as the rotating shaft 301 rotates, the turntable 403 and the gear a506 can also rotate. After the gear a506 meshes with the gear b508, the rotation of the gear a506 can make the connecting shaft 507 rotate. Furthermore, through the transmission of the connecting shaft 507, the guide ring 503 can also rotate through the gear meshing method, thereby adjusting the position of the guide ring 503 and pushing the adjusting block 102 to move along the guide rail 501. Through this mechanism, the adjusting component can accurately adjust the position of the adjusting block 102 when the driving component drives the wind blade a106 to rotate, so as to control the diameter of the air inlet channel 104. The core purpose of this setting is to ensure the coordination and consistency of each part, avoid mismatches or functional conflicts when each component operates independently, and improve the overall performance and stability. The linkage design enables the adjustment of the air inlet channel 104 and the rotation of the wind blade without separate control, and the operation of each component automatically responds to the overall needs of the system. This reduces the burden of manual intervention.

[0104] As a further solution of the present invention, a connecting strip 511 is connected to the side wall of the lower box body 101, the connecting shaft 507 is rotatably connected to the connecting strip 511, a ratchet mechanism 512 is provided between the connecting strip 511 and the connecting shaft 507, the gear a506 is an incomplete gear, and a spring d513 is provided between the guide ring 503 and the air outlet cylinder 201;

[0105] By setting the ratchet mechanism 512, when the rotating shaft 301 rotates to drive the turntable 403 and the gear a 506 to rotate, when the gear a 506 rotates one week, the gear b 508 and the connecting shaft 507 can be rotated by a preset angle, and then the guide ring 503 can be rotated by a preset angle. At this time, the spring d 513 twists to generate potential energy. Due to the limitation of the ratchet mechanism 512, the connecting shaft 507 will only rotate in one direction. That is, when the gear c 509 and the gear d 510 are in the meshing state, even if the spring d 513 twists to generate potential energy, the potential energy will not be released, resulting in the restoration of the position after adjusting the position of the adjusting block 102 and reducing the diameter of the air inlet channel 104. When the connecting shaft 507 rotates again later, the diameter of the air inlet channel 104 will be reduced by a distance a1 again, so as to further adjust the size of the air inlet channel 104. At this time, the ratchet mechanism 512 still maintains the one-way restriction on the connecting shaft 507, ensuring that each time the gear a 506 rotates, the connecting shaft 507 can only rotate in the preset direction, avoiding any reverse operation from causing unnecessary influence on the adjustment system. The setting of this ratchet mechanism 512 enables the system to have a self-locking function, avoiding the phenomenon of restoring to the original position at inappropriate times, so as to ensure that each adjustment is carried out towards the preset goal and there will be no backward movement during the adjustment process. Through this precise control, the movement of the adjusting block 102 and the reduction of the diameter of the air inlet channel 104 can continuously maintain the required heating effect and wind speed, and ensure its stability in each operation. In addition, setting the gear a 506 as an incomplete gear is actually to achieve an intermittent reduction in the diameter of the air inlet channel 104 rather than a continuous change. In this way, the amplitude of each adjustment can be precisely controlled, avoiding excessive reduction of the diameter of the air inlet channel 104 at one time, resulting in too fast or too strong air flow, and ensuring that each adjustment can be completed smoothly and gradually. The intermittent reduction method of the air inlet channel 104 can more finely adjust the air flow speed. Moreover, a key advantage of this design is that the wind speed can be kept stable after each adjustment and can pass through the filter paper smoothly for a period of time. When the air flow is stable and continuously passes through the filter paper, the detection system can capture the air permeability characteristics of the filter paper in a controllable manner. Each time the wind speed is adjusted, the stable air flow can give a consistent air permeability measurement, making the data between each detection cycle more comparable, thereby optimizing the overall detection process and facilitating the tracking and comparison of the change in the air permeability of the filter paper. If the wind speed changes too much during the air permeability detection process, it will affect the adaptability evaluation and adjustment of the filter paper. By allowing a certain rate of air flow to pass through the filter paper steadily for a predetermined time, the air permeability characteristics of the filter paper at different wind speeds can be accurately detected. As the wind speed changes, the air permeability of the filter paper may exhibit different behavior patterns. For example, at a lower wind speed, the pore structure of the filter paper may be able to effectively maintain air circulation, while at a higher wind speed, the microstructure of the filter paper may change due to compression or other factors, resulting in different performances of the air permeability.Through this step - by - step adjustment and monitoring, the air permeability of the filter paper at different wind speeds can be accurately obtained, and it can help optimize its air - permeability performance when designing and manufacturing the filter paper.

[0106] As a further solution of the present invention, a connecting groove 600 is provided on the inner side wall of the lower box body 101. The support platform 105 is slidably connected in the connecting groove 600. A spring e601 is connected between the connecting groove 600 and the support platform 105. A positioning claw a602 is connected to the bottom of the support platform 105. A transverse groove 603 is provided on the sealing channel 109. A positioning claw b604 is slidably connected in the transverse groove 603. A spring f605 is connected between the positioning claw b604 and the transverse groove 603.

[0107] By setting the spring e601, after unlocking the support platform 105, when the rotation of the wind blade a106 generates negative pressure in the lower box body 101, the negative pressure can overcome the force of the spring e601, causing the support platform 105 to move downward, so that the spring e601 is compressed to generate potential energy. During the detection process, when the air permeability of the filter paper reaches the critical point and breaks, and the negative pressure state in the lower box body 101 cannot overcome the potential energy of the spring e601, the support platform 105 can move upward to reset. At this time, the support platform 105 quickly returns to its position under the potential energy of the spring e601 and will collide with the connecting groove 600 to make a sound. This sound can prompt the detection staff to avoid delay and ensure the timely processing of test data. In addition, the purpose of setting the positioning claw a602 on the support platform 105 is that when the sealing channel 109 moves downward to reach the opening on the support platform 105, it will contact and squeeze the filter paper on it, fixing the filter paper on the support platform 105. At this time, the positioning claw a602 can squeeze the positioning claw b604, causing the positioning claw b604 to displace and squeeze the filter paper more forcefully, which can improve the fixing effect on the filter paper.

[0108] As a further solution of the present invention, a connecting frame 606 is slidably connected to the turntable 403. The gear a506 is connected to the connecting frame 606. A spring g607 is connected between the connecting frame 606 and the turntable 403. A connecting rod a608 is connected to the bottom of the support platform 105. A connecting rod b609 that cooperates with the connecting rod a608 is slidably connected to the side wall of the lower box body 101. A spring h610 is connected between the connecting rod b609 and the side wall of the lower box body 101. The connecting rod b609 abuts against the connecting frame 606, and the spring g607 is in a stretched state and has potential energy.

[0109] By setting the connecting rod a608 and the connecting rod b609, the purpose of making the support platform 105 displace downward under the action of negative pressure is also as follows: The spring g607 is in a stretched state and has potential energy. The connecting rod a608 and the connecting rod b609 are in contact in the initial state, and the connecting rod b609 can support the position of the connecting frame 606, so that the horizontal heights of the gear a506 and the gear b508 are different in the initial state. When the support platform 105 displaces downward, the connecting rod a608 touches the connecting rod b609 and causes the connecting rod b609 to displace. After the connecting rod b609 no longer supports the connecting frame 606, the connecting frame 606 and the gear a506 will displace downward under the action of the spring h610, so that the gear a506 and the gear b508 form a horizontally corresponding state. When the teeth on the gear a506 mesh with the gear b508, the connecting shaft 507 can be rotated. As the detection work progresses, when the filter paper ruptures and the negative pressure in the lower box body 101 is not sufficient to attract the support platform 105, the support platform 105 will be reset upward to the origin by the force of the spring e601, the connecting rod b609 will move back, and the connecting frame 606 will be lifted again, causing the horizontal heights of the gear a506 and the gear b508 to change and no longer driving the displacement of the adjusting block 102. Thus, after the detection work is completed, it can cooperate with the ratchet mechanism 512 to timely and automatically lock the diameter of the current air inlet channel 104, ensuring the accuracy of the test results. It realizes the stable control of the air velocity during the test process of the air permeability of the filter paper, and also has the functions of automatic reset and accurate locking of the diameter of the air inlet channel 104, greatly improving the reliability and automation degree of the test.

[0110] A method for detecting the air permeability of a high-temperature resistant filter paper, applicable to a device for detecting the air permeability of a high-temperature resistant filter paper described in any one of the above, the specific steps are as follows:

[0111] Step 1: The operator places the filter paper to be detected on the support platform 105, ensures that the filter paper is laid flat and has no wrinkles. After starting the device, the driving component drives the moving component to move the upper box body 100 downward in the vertical direction so that it is in full contact with the lower box body 101. At this time, the locking component locks the sealing channel 109 and the support platform 105 to ensure that the filter paper is fixed and seals its surroundings to prevent air leakage.

[0112] Step 2: After the upper box body 100 reaches the lower box body 101, the locking component unlocks the support platform 105 and the sealing channel 109. Subsequently, the driving component drives the wind blade a106 to rotate to form a negative pressure in the lower box body 101. The negative pressure causes the air flow to pass through the air inlet channel 104, the wind blade b107, the sealing channel 109, penetrate the filter paper and enter the lower box body 101, and then be discharged from the lower box body 101.

[0113] Step 3: As the test progresses, the adjusting component starts to drive the adjusting block 102 to move inward, gradually reducing the diameter of the air inlet channel 104 in an intermittent manner. The interval for each reduction is a, and the reduction amount is a1, so that the air flow velocity entering the upper box body 100 gradually increases, thereby increasing the wind speed passing through the filter paper and simulating the working state of the filter paper under different conditions;

[0114] Step 4: As the air inlet channel 104 gradually shrinks, the velocity of the air flow passing through the filter paper continues to increase, and the rotational speed of the wind blade b107 increases accordingly. The rotational speed sensor 108 monitors the change in the rotational speed of the wind blade b107 in real time. When the filter paper is close to the air permeability limit, the increase rate of the rotational speed of the wind blade b107 gradually decreases until the filter paper ruptures, and the rotational speed of the wind blade b107 shows irregular fluctuations. The wind speed threshold can be recorded;

[0115] Step 5: When the filter paper ruptures, the support platform 105 loses the negative pressure support due to the sudden increase in air permeability and automatically resets to the initial position. At the same time, the adjusting component stops adjusting the adjusting block 102 and keeps the air inlet channel 104 in the state at the time of rupture. At this time, the test data before and after the air permeability limit of the filter paper can be saved;

[0116] Step 6: The operator can analyze the air permeability and durability data of the filter paper through the rotational speed change curve of the wind blade b107 recorded by the rotational speed sensor 108. After the detection is completed, the upper box body 100 resets. The operator takes out the ruptured filter paper and can replace it with a new filter paper for the next detection.

[0117] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature resistant filter paper air permeability detection device, characterized in that, Including: An upper box body (100) and a lower box body (101), with a spacing between the upper box body (100) and the lower box body (101); A plurality of adjusting blocks (102) arranged in the upper box body (100), a plurality of heating wires (103) are arranged on the adjusting blocks (102), and the plurality of adjusting blocks (102) enclose an air inlet channel (104). A support platform (105) is arranged in the lower box body (101), and the support platform (105) is slidably arranged in the lower box body (101) for supporting filter paper; A fan blade a (106) arranged in the lower box body (101), rotatably arranged in the lower box body (101), a fan blade b (107) is arranged in the upper box body (100), and a rotational speed sensor (108) is arranged on the fan blade b (107); A sealing channel (109) arranged in the upper box body (100), cooperating with the support platform (105); A driving component arranged in the lower box body (101), used to drive the fan blade a (106) to rotate to generate negative pressure in the lower box body (101); A locking component arranged between the upper box body (100) and the lower box body (101), used to lock the positions of the sealing channel (109) and the support platform (105) when there is a spacing between the upper box body (100) and the lower box body (101), and the locking component can unlock the sealing channel (109) and the support platform (105) when the upper box body (100) moves downward to the lower box body (101); An adjusting component arranged between the lower box body (101) and the adjusting block (102), used to move the adjusting block (102) to reduce the diameter of the air inlet channel (104); A moving component arranged between the fan blade a (106) and the upper box body (100), used to drive the upper box body (100) to move in the vertical direction; The locking component includes an air inlet cylinder (200) and an air outlet cylinder (201) connected to the upper box body (100). The locking component further includes a sliding groove b (208) opened on the lower box body (101), a push rod b (209) is slidably connected in the sliding groove b (208), a locking port (210) corresponding to the sliding groove b (208) is opened on the side wall of the support platform (105), and a locking rod (211) slidably connected to the sliding groove b (208) is slidably connected in the locking port (210). Spring b (212) is arranged between the locking rod (211) and the sliding groove b (208), and between the push rod b (209) and the sliding groove b (208). A connecting rod (213) is rotatably connected between the locking rod (211) and the push rod b (209); The driving component includes a driving motor (300) connected in the lower box body (101), a rotating shaft (301) is connected to the driving shaft of the driving motor (300), and the fan blade a (106) is arranged on the rotating shaft (301); The moving part includes a spring telescopic rod (400) connected between the upper box body (100) and the lower box body (101). A traction shaft (401) is provided on the rotating shaft (301). A traction rope (402) is connected to the traction shaft (401). One end of the traction rope (402) passes through the lower box body (101) and is connected to the upper box body (100). Among them, the moving part moves the upper box body (100) in the vertical direction to a predetermined position and stops after reaching the predetermined position. The moving part further includes a turntable (403) connected to the rotating shaft (301). A connecting ring (404) is connected to the bottom of the turntable (403). The traction shaft (401) is rotatably connected to the bottom of the turntable (403). A wedge-shaped groove (405) is formed at the bottom of the connecting ring (404). A wedge-shaped strip (406) that cooperates with the wedge-shaped groove (405) is slidably connected to the top of the traction shaft (401). A spring c (407) is connected between the wedge-shaped strip (406) and the traction shaft (401). The elastic potential energy of the spring c (407) is greater than that of the spring telescopic rod (400). The adjusting part includes a fixing ring (500) fixed to the bottom of the air inlet cylinder (200). A guide rail (501) is formed at the bottom of the fixing ring (500). A guide bar (502) that slidably cooperates with the guide rail (501) is connected to the top of the adjusting block (102). A guide ring (503) is rotatably connected to the top of the air inlet cylinder (200). An arc-shaped guide opening (504) is formed on the guide ring (503). A guide rod (505) that slidably cooperates with the arc-shaped guide opening (504) is connected to the bottom of the adjusting block (102). Among them, the adjusting part can adjust the position of the adjusting block (102) when the driving part drives the fan blade a (106) to rotate. The adjusting part further includes a gear a (506) provided on the turntable (403). A connecting shaft (507) is rotatably connected to the lower box body (101). A gear b (508) adapted to the gear a (506) is connected to the bottom of the connecting shaft (507). A gear c (509) is connected to the top of the connecting shaft (507). A gear d (510) adapted to the gear c (509) is connected to the outer wall of the guide ring (503).

2. The high-temperature resistant filter paper air permeability detection device according to claim 1, characterized in that, The adjusting block (102) is arranged between the air inlet cylinder (200) and the air outlet cylinder (201). A bracket (202) is connected to the air outlet cylinder (201). The fan blade b (107) is arranged on the bracket (202) through a bearing. The rotational speed sensor (108) is fixed on the bracket (202), and the sensing end of the rotational speed sensor (108) faces the fan blade b (107). A sliding groove a (203) is jointly formed on the upper box body (100) and the air outlet cylinder (201). A push rod a (204) is slidably connected in the sliding groove a (203), and a blocking rod (205) is slidably connected in the sliding groove a (203). A blocking groove (206) slidably connected with the blocking rod (205) is formed on the inner side wall of the sealing channel (109). Spring a (207) is arranged between the push rod a (204) and the sliding groove a (203), and between the blocking rod (205) and the sliding groove a (203).

3. The high-temperature resistant filter paper air permeability detection device according to claim 1, characterized in that, Before driving the fan blade a (106) to rotate, the driving component first controls the moving component to move the upper box body (100) in the vertical direction; The driving component further includes a rotating cylinder (302) arranged on the rotating shaft (301). The fan blade a (106) is fixed on the rotating cylinder (302). The rotating cylinder (302) is connected to the rotating shaft (301) through a bearing. A guiding groove (303) is formed on the outer wall of the rotating cylinder (302), and a guiding rod (304) matched with the guiding groove (303) is connected to the rotating shaft (301).

4. The high-temperature resistant filter paper air permeability detection device according to claim 2, characterized in that, A connecting strip (511) is connected to the side wall of the lower box body (101). The connecting shaft (507) is rotatably connected to the connecting strip (511). A ratchet mechanism (512) is arranged between the connecting strip (511) and the connecting shaft (507). The gear a (506) is an incomplete gear. A spring d (513) is arranged between the guiding ring (503) and the air outlet cylinder (201).

5. The high-temperature resistant filter paper air permeability detection device according to claim 1, wherein, The support platform (105) can move towards the fan blade a (106) under the negative pressure action of the lower box body (101) and the positive pressure action of the upper box body (100); A connecting groove (600) is formed on the inner side wall of the lower box body (101). The support platform (105) is slidably connected in the connecting groove (600). A spring e (601) is connected between the connecting groove (600) and the support platform (105). A positioning claw a (602) is connected to the bottom of the support platform (105). A transverse groove (603) is formed on the sealing channel (109). A positioning claw b (604) is slidably connected in the transverse groove (603). A spring f (605) is connected between the positioning claw b (604) and the transverse groove (603); When the support platform (105) moves downwards to a preset position, the adjusting component synchronously adjusts the positions of a plurality of adjusting blocks (102) in an intermittent manner, and the diameter of the air inlet channel (104) gradually decreases according to a preset time interval a, and the distance of each decrease is a1; A connecting frame (606) is slidably connected to the turntable (403). A gear a (506) is connected to the connecting frame (606). A spring g (607) is connected between the connecting frame (606) and the turntable (403). A connecting rod a (608) is connected to the bottom of the support platform (105). A connecting rod b (609) that cooperates with the connecting rod a (608) is slidably connected to the side wall of the lower box body (101). A spring h (610) is connected between the connecting rod b (609) and the side wall of the lower box body (101). The connecting rod b (609) abuts against the connecting frame (606). The spring g (607) is in a stretched state and has potential energy.

6. A method for detecting the air permeability of a high-temperature resistant filter paper, applicable to the high-temperature resistant filter paper air permeability detection device described in any one of claims 1-5, characterized in that, The specific steps are as follows: Step 1: The operator places the filter paper to be tested on the support platform (105), ensuring that the filter paper is laid flat and has no wrinkles. After starting the equipment, the driving component drives the moving component to move the upper box body (100) downward in the vertical direction so that it is in full contact with the lower box body (101). At this time, the locking component locks the sealing channel (109) and the support platform (105) to ensure that the filter paper is fixed and seals its surroundings to prevent air leakage. Step 2: After the upper box body (100) reaches the lower box body (101), the locking component unlocks the support platform (105) and the sealing channel (109). Subsequently, the driving component drives the wind blade a (106) to rotate, creating a negative pressure in the lower box body (101). The negative pressure causes the air flow to pass through the air inlet channel (104), the wind blade b (107), the sealing channel (109), penetrate the filter paper and enter the lower box body (101), and then be discharged from the lower box body (101). Step 3: As the test progresses, the adjusting component starts to drive the adjusting block (102) to move inward, gradually reducing the diameter of the air inlet channel (104) in an intermittent manner. The interval for each reduction is a, and the reduction amount is a(1), so that the air flow velocity entering the upper box body (100) gradually increases, thereby increasing the wind speed passing through the filter paper and simulating the working state of the filter paper under different conditions. Step 4: As the air inlet channel (104) is gradually reduced, the speed of the air flow penetrating the filter paper continues to increase, and the rotation speed of the wind blade b (107) increases accordingly. The rotation speed sensor (108) monitors the change in the rotation speed of the wind blade b (107) in real time. When the filter paper is close to the air permeability limit, the increase rate of the rotation speed of the wind blade b (107) gradually decreases until the filter paper ruptures, and the rotation speed of the wind blade b (107) shows irregular fluctuations. The wind speed threshold can be recorded. Step 5: When the filter paper ruptures, the support platform (105) loses negative pressure support due to the sudden increase in air permeability and automatically resets to the initial position. At the same time, the adjusting component stops adjusting the adjusting block (102) and keeps the air inlet channel (104) in the state at the time of rupture. At this time, the test data before and after the air permeability limit of the filter paper can be saved. Step 6: The operator can analyze the air permeability and durability data of the filter paper through the rotational speed change curve of the blade b (107) recorded by the rotational speed sensor (108). After the detection is completed, the upper box body (100) is reset. The operator takes out the broken filter paper and can replace it with a new filter paper for the next detection.

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