阅读说明：本技术 空气滤清器用滤芯检测装置及方法 (Filter element detection device and method for air filter ) 是由 余振威 余青青 吕心钏 黄文俊 田忠强 于 2020-07-29 设计创作，主要内容包括：空气滤清器用滤芯检测装置及方法,包括筒体,所述筒体的内部中线处插入有滤芯,所述筒体与滤芯之间留有通风间隙；所述筒体的内部底部连接有同轴的风机盒,所述风机盒的顶面出风口处安装有同轴的下定位架,所述下定位架贴合置于滤芯的底面,所述筒体的顶部套装有同轴的盖罩,所述盖罩的中心处开设有第一通风孔,所述盖罩的底面设有同轴的上定位架,所述上定位架贴合置于滤芯的顶面；方法为：S1、滤芯制备：S2、滤芯与检测装置装配：S3、滤芯外观检测：S4、滤芯粘接强度检测：S5、取下检测合格的滤芯；本发明通过通风检测可实现滤芯外观检测、滤芯固化以及滤芯粘接强度检测。(The filter element detection device and method for the air filter comprise a cylinder body, wherein a filter element is inserted into the center line of the interior of the cylinder body, and a ventilation gap is reserved between the cylinder body and the filter element; the coaxial fan box is connected to the bottom inside the barrel, a coaxial lower positioning frame is mounted at an air outlet on the top surface of the fan box, the lower positioning frame is attached to the bottom surface of the filter element, a coaxial cover is sleeved on the top of the barrel, a first ventilation hole is formed in the center of the cover, a coaxial upper positioning frame is arranged on the bottom surface of the cover, and the upper positioning frame is attached to the top surface of the filter element; the method comprises the following steps: s1, preparing a filter element: s2, assembling the filter element and the detection device: s3, detecting the appearance of the filter element: s4, detecting the bonding strength of the filter element: s5, taking down the qualified filter element; according to the invention, the appearance detection, filter element solidification and filter element bonding strength detection of the filter element can be realized through ventilation detection.)

1. Filter core detection device for air cleaner, its characterized in that: the filter element is inserted into the center line of the interior of the cylinder, and a ventilation gap is reserved between the cylinder and the filter element;

the coaxial fan box is connected to the bottom inside the barrel, a coaxial lower positioning frame is mounted at an air outlet on the top surface of the fan box, the lower positioning frame is attached to the bottom surface of the filter element, a coaxial cover is sleeved on the top of the barrel, a first ventilation hole is formed in the center of the cover, a coaxial upper positioning frame is arranged on the bottom surface of the cover, and the upper positioning frame is attached to the top surface of the filter element; the upper positioning frame and the lower positioning frame are used for clamping and fixing the filter element up and down;

the lower locating rack and the upper locating rack are of hollow frame structures, a continuous air channel is formed among the lower locating rack, the ventilation gap, the upper locating rack and the first ventilation hole, and a gas flow detection component is installed in the hollow area of the upper locating rack.

2. The filter cartridge testing device for an air cleaner according to claim 1, wherein: the top surface of the fan box is provided with a connecting ring, the connecting ring is spirally arranged at the bottom of the inner part of the cylinder body, and the lower positioning frame is fixedly embedded in the connecting ring.

3. The filter cartridge testing device for an air cleaner according to claim 1, wherein: the structure of the upper positioning frame is the same as that of the lower positioning frame, the upper positioning frame comprises an outer ring body, an inner ring body and reinforcing strips, the inner ring body is concentric with the outer ring body, the outer ring body is arranged on the inner wall of the cover, the reinforcing strips are distributed in an annular array mode, one end of each reinforcing strip is fixedly connected with the inner ring body, the other end of each reinforcing strip is fixedly connected with the outer ring body, and the area between every two adjacent reinforcing strips is a second ventilation hole.

4. The filter cartridge testing device for an air cleaner according to claim 3, wherein: the gas flow detection part comprises a first gas flowmeter and a second gas flowmeter, each of the first gas flowmeter distributed in an annular array is installed on the outer ring inside the second ventilation hole, the second gas flowmeter distributed in an annular array is installed on the inner ring inside the second ventilation hole, the first gas flowmeter is arranged opposite to the ventilation gap, and the second gas flowmeter is arranged opposite to the top surface of the filter element.

5. The filter cartridge testing device for an air cleaner according to claim 4, wherein: the gas flow detection part also comprises a membrane, wherein the inner wall of the first ventilation hole is provided with the membranes distributed in an annular array, and the membranes are of a light plastic structure.

6. The filter cartridge testing device for an air cleaner according to claim 4, wherein: the outer wall of the barrel is provided with mounting holes distributed in an annular array mode, a UV lamp is embedded into each mounting hole, and the UV lamps extend along the axis direction of the barrel.

7. The filter cartridge testing device for an air cleaner according to claim 4, wherein: and a separation cover is arranged between the second gas flowmeter and the first gas flowmeter, and the diameter of the separation cover is the same as the standard diameter of the filter element.

8. The filter element detection method for the air filter is characterized by comprising the following steps: the detection method comprises the following steps:

s1, preparing a filter element:

winding the air filter paper on the outer wall of the mandrel, and pouring adhesive glue on the filter paper in the winding process to ensure that the filter paper is fixedly bonded with the mandrel and each layer of filter paper is fixedly bonded;

after the required number of turns of rolling, stopping the rotation of the mandrel, and cutting off redundant filter paper to obtain the filter element;

s2, assembling the filter element and the detection device:

inserting the filter element into the cylinder until the bottom end of the filter element is inserted and positioned with the lower positioning frame at the bottom;

screwing the cover on the top of the cylinder body, so that the top end of the filter element is inserted and positioned with the upper positioning frame positioned on the top of the filter element; at the moment, the filter element is stably and coaxially arranged in the cylinder body, and a ventilation gap is reserved between the filter element and the cylinder body;

s3, detecting the appearance of the filter element:

s3.1, starting a fan box at the bottom of the filter element, wherein the wind speed generated by the fan box is V₁The air flow generated by the fan box moves from bottom to top, and after passing through the lower positioning frame, the air flow is blocked by the bottom surface of the filter element, so that the air flow can only flow upwards through the ventilation gap, then the air flow passes through the upper positioning frame and finally is discharged through the first ventilation hole in the center of the cover;

s3.2, after the airflow channel in the barrel is constructed stably, starting n first gas flowmeters arranged at the outer ring of the ventilation opening of the upper positioning frame, and recording the flow of gas passing through the position in unit time by each first gas flowmeter; after the numerical value is stable, closing each first gas flowmeter and each fan box; in the process of S3.1-S3.2, the glue in the filter element is dried by air flow, so that the filter element is cured;

s3.3, comparing the difference value of each gas flow value detected in the S3.2 with the preset gas flow in the standard unit time, and judging whether the gas flow value is not in the range of the gas flow in the standard unit time;

if so, indicating that the appearance of the filter element is unqualified, and alarming to improve the condition that workers transfer the filter element to a finishing process;

if not, the filter element is qualified in appearance, and the process enters S4;

s4, detecting the bonding strength of the filter element:

s4.1, starting a fan box at the bottom of the filter element, wherein the wind speed generated by the fan box is V₂，V₂Is a V₁2-3 times of the total weight of the composition;

s4.2, after the airflow channel in the barrel is constructed stably, starting n second gas flowmeters distributed in the inner ring of the ventilation opening of the upper positioning frame, and recording the flow of gas passing through the position in unit time by each second gas flowmeter; after the numerical value is stable, closing each second gas flowmeter and each fan box;

s4.3, comparing each gas flow value detected in the S4.2 with the preset standard ventilation of the filter element in unit time, and judging whether the gas flow value is out of the standard ventilation range;

if so, indicating that the bonding strength of the filter element is unqualified, and alarming to improve the condition that workers transfer the filter element to a finishing process;

if not, the bonding strength of the filter element is qualified, and the process enters S5;

and S5, removing the qualified filter element.

9. The method for inspecting a filter element for an air cleaner according to claim 8, wherein: the inner wall of the cylinder body is embedded with a UV lamp, and in the S3.1-S3.2 process, the UV lamp can work synchronously to carry out curing treatment on the filter element.

10. The method for inspecting a filter element for an air cleaner according to claim 8, wherein: and a separation cover is arranged between the first gas flowmeter and the second gas flowmeter, and the exhaust gas flow of the ventilation gap and the exhaust gas flow of the filter element body are separated by the separation cover.

Technical Field

The invention belongs to the technical field of filter processing, and particularly relates to a filter element detection device and method for an air filter.

Background

The automobile air filter is an article for removing particle impurities in air in an automobile, and the automobile air conditioner filter can effectively reduce pollutants entering the automobile through a heating ventilation and air conditioning system and prevent the pollutants harmful to the body from being sucked; the main body part of the air filter is just a filter element, the cylindrical air filter element is assembled by a mandrel and filter paper wound on the outer wall of the mandrel, and the filter paper and the mandrel are bonded and fixed by glue;

after the filter element is bonded and rolled, appearance detection needs to be carried out on the filter element, the conventional detection method is that a worker holds the roll core by hand, the diameter of the roll core is up to the standard by hand feeling, then the filter element is inserted into a standard sleeve, the inner diameter of the sleeve is the same as the standard diameter of the filter element, and the diameter of the filter element is secondarily detected by sensing the smoothness degree during insertion to be up to the standard;

the above detection method has the following problems: 1. the detection process is completely based on hand feeling and can be completed by skilled workers, and the training difficulty of the workers is high; 2. the detection error exists due to the fact that subjective consciousness is too large by hand feeling.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a filter element detection device for an air filter, and the specific technical scheme is as follows:

the filter element detection device for the air filter comprises a cylinder body, wherein a filter element is inserted into the center line of the interior of the cylinder body, and a ventilation gap is reserved between the cylinder body and the filter element;

the coaxial fan box is connected to the bottom inside the barrel, a coaxial lower positioning frame is mounted at an air outlet on the top surface of the fan box, the lower positioning frame is attached to the bottom surface of the filter element, a coaxial cover is sleeved on the top of the barrel, a first ventilation hole is formed in the center of the cover, a coaxial upper positioning frame is arranged on the bottom surface of the cover, and the upper positioning frame is attached to the top surface of the filter element; the upper positioning frame and the lower positioning frame are used for clamping and fixing the filter element up and down;

the lower locating rack and the upper locating rack are of hollow frame structures, a continuous air channel is formed among the lower locating rack, the ventilation gap, the upper locating rack and the first ventilation hole, and a gas flow detection component is installed in the hollow area of the upper locating rack.

Furthermore, a connecting ring is arranged on the top surface of the fan box, the connecting ring is spirally arranged at the bottom of the inner part of the cylinder body, and the lower positioning frame is fixedly embedded in the connecting ring.

Furthermore, the upper positioning frame and the lower positioning frame are identical in structure, the upper positioning frame comprises an outer ring body, an inner ring body and reinforcing strips, the inner portion of the outer ring body is provided with the concentric inner ring body, the outer ring body is arranged on the inner wall of the cover, the reinforcing strips are distributed in an annular array mode, one end of each reinforcing strip is fixedly connected with the inner ring body, the other end of each reinforcing strip is fixedly connected with the outer ring body, and the area between every two adjacent reinforcing strips is a second ventilation hole.

Further, the gas flow detection part comprises a first gas flowmeter and a second gas flowmeter, each of the first gas flowmeter distributed in an annular array is installed on the outer ring of the inner part of the second ventilation hole, the second gas flowmeter distributed in an annular array is installed on the inner ring of the inner part of the second ventilation hole, the first gas flowmeter is arranged opposite to the ventilation gap, and the second gas flowmeter is arranged opposite to the top surface of the filter element.

Furthermore, the gas flow detection part also comprises a membrane, wherein the inner wall of the first vent hole is provided with membranes distributed in an annular array, and the membranes are of a light plastic structure.

Furthermore, the outer wall of the barrel is provided with mounting holes distributed in an annular array, a UV lamp is embedded into each mounting hole, and the UV lamps extend along the axis direction of the barrel.

Furthermore, a separation cover is arranged between the second gas flowmeter and the first gas flowmeter, and the diameter of the separation cover is the same as the standard diameter of the filter element.

The detection method of the filter element for the air filter comprises the following steps:

s1, preparing a filter element:

winding the air filter paper on the outer wall of the mandrel, and pouring adhesive glue on the filter paper in the winding process to ensure that the filter paper is fixedly bonded with the mandrel and each layer of filter paper is fixedly bonded;

after the required number of turns of rolling, stopping the rotation of the mandrel, and cutting off redundant filter paper to obtain the filter element;

s2, assembling the filter element and the detection device:

inserting the filter element into the cylinder until the bottom end of the filter element is inserted and positioned with the lower positioning frame at the bottom;

screwing the cover on the top of the cylinder body, so that the top end of the filter element is inserted and positioned with the upper positioning frame positioned on the top of the filter element; at the moment, the filter element is stably and coaxially arranged in the cylinder body, and a ventilation gap is reserved between the filter element and the cylinder body;

s3, detecting the appearance of the filter element:

s3.1, starting a fan box at the bottom of the filter element, wherein the wind speed generated by the fan box is V₁The air flow generated by the fan box moves from bottom to top, and after passing through the lower positioning frame, the air flow is blocked by the bottom surface of the filter element, so that the air flow can only flow upwards through the ventilation gap, then the air flow passes through the upper positioning frame and finally is discharged through the first ventilation hole in the center of the cover;

s3.2, after the airflow channel in the barrel is constructed stably, starting n first gas flowmeters arranged at the outer ring of the ventilation opening of the upper positioning frame, and recording the flow of gas passing through the position in unit time by each first gas flowmeter; after the numerical value is stable, closing each first gas flowmeter and each fan box; in the process of S3.1-S3.2, the glue in the filter element is dried by air flow, so that the filter element is cured;

s3.3, comparing the difference value of each gas flow value detected in the S3.2 with the preset gas flow in the standard unit time, and judging whether the gas flow value is not in the range of the gas flow in the standard unit time;

if so, indicating that the appearance of the filter element is unqualified, and alarming to improve the condition that workers transfer the filter element to a finishing process;

if not, the filter element is qualified in appearance, and the process enters S4;

s4, detecting the bonding strength of the filter element:

s4.1, starting a fan box at the bottom of the filter element, wherein the wind speed generated by the fan box is V₂，V₂Is a V₁2-3 times of the total weight of the composition;

s4.2, after the airflow channel in the barrel is constructed stably, starting n second gas flowmeters distributed in the inner ring of the ventilation opening of the upper positioning frame, and recording the flow of gas passing through the position in unit time by each second gas flowmeter; after the numerical value is stable, closing each second gas flowmeter and each fan box;

s4.3, comparing each gas flow value detected in the S4.2 with the preset standard ventilation of the filter element in unit time, and judging whether the gas flow value is out of the standard ventilation range;

if so, indicating that the bonding strength of the filter element is unqualified, and alarming to improve the condition that workers transfer the filter element to a finishing process;

if not, the bonding strength of the filter element is qualified, and the process enters S5;

and S5, removing the qualified filter element.

Furthermore, a UV lamp is embedded in the inner wall of the cylinder body, and in the S3.1-S3.2 process, the UV lamp can work synchronously to perform curing treatment on the filter element.

Furthermore, a separation cover is arranged between the first gas flowmeter and the second gas flowmeter, and the exhaust gas flow of the ventilation gap and the exhaust gas flow of the filter element body are separated by the separation cover.

The invention has the beneficial effects that:

1. a ventilation gap is reserved between the cylinder body and the filter element, and if the diameter of the filter element is too large, the ventilation gap is reduced, and the ventilation quantity is reduced; if the diameter of the filter element is too small, the ventilation quantity is increased; if the filter element is irregular in shape, the ventilation quantity at each position is not uniform, and the local part is too large or too small; by the principle, the appearance detection of the filter element can be realized;

2. the ventilation quantity of the filter element body can be detected by increasing the wind speed so as to judge whether the bonding part is loosened; during appearance detection, the blown air can also blow the glue solution in the filter element to realize filter element solidification, and a solidification process is not required to be independently arranged, so that the adhesion strength detection can be continuously carried out;

3. go up locating rack, lower locating rack and can compress tightly location filter core, below from upper portion and support the location filter core for the barrel body can be stably arranged in to the filter core, avoids the skew that the filter core was blown by wind, guarantees to detect the precision.

Drawings

FIG. 1 is a schematic view showing the construction of a cartridge testing device for an air cleaner according to the present invention;

FIG. 2 is a schematic diagram showing a separation structure of the filter cartridge testing device of the present invention;

FIG. 3 is a schematic top cross-sectional view of the upper spacer of the present invention;

FIG. 4 shows a schematic view of the connection structure of the cartridge and the UV lamp of the present invention;

shown in the figure: 1. a barrel; 11. mounting holes; 12. a ventilation gap; 2. a UV lamp; 3. a cover; 31. a first vent hole; 32. a membrane; 4. an upper positioning frame; 41. an outer ring body; 42. an inner ring body; 43. a reinforcing strip; 44. a second vent hole; 5. a fan box; 51. a connecting ring; 6. a lower positioning frame; 7. a first gas flow meter; 8. a second gas flow meter.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The filter element detection device for the air filter comprises a cylinder body 1, wherein a filter element is inserted into the center line of the interior of the cylinder body 1, and a ventilation gap 12 is reserved between the cylinder body and the filter element; the inner diameter of the barrel is 2-5mm larger than the diameter of the filter element, a ventilation gap 12 is reserved for facilitating subsequent ventilation detection, if the diameter of the filter element is too large, the ventilation gap is reduced, the ventilation is reduced, if the diameter of the filter element is too small, the ventilation is increased, if the shape of the filter element is irregular, the ventilation at each position is uneven, and the local part is too large or too small, and the appearance detection of the filter element can be realized through the principle;

the coaxial fan box 5 is connected to the bottom inside the barrel 1 and is used for generating airflow from bottom to top so as to realize ventilation detection, the generated airflow can realize appearance detection, the popularity can be increased so as to realize bonding strength detection, glue in the filter element can be dried while the appearance detection is carried out, and the filter element solidification is realized, so that three actions are completed in one step, the production cost is effectively reduced, and the production efficiency is improved;

a coaxial lower positioning frame 6 is mounted at an air outlet on the top surface of the fan box 5, the lower positioning frame 6 is attached to the bottom surface of the filter element, a coaxial cover 3 is sleeved on the top of the barrel 1, a first vent hole 31 is formed in the center of the cover 3, a coaxial upper positioning frame 4 is arranged on the bottom surface of the cover 3, and the upper positioning frame 4 is attached to the top surface of the filter element; the upper positioning frame 4 and the lower positioning frame 6 are used for clamping and fixing the filter element up and down; the upper positioning frame 4 can compress and position the filter element from the upper part, and the lower positioning frame 6 can support and position the filter element from the lower part, so that the filter element can be stably arranged in the cylinder body, and the influence on the detection precision caused by the deflection of the filter element blown by wind is avoided;

the lower positioning frame 6 and the upper positioning frame 4 are both hollow frame structures, continuous air channels are formed among the lower positioning frame 6, the ventilation gap 12, the upper positioning frame 4 and the first ventilation holes 31, the hollow frame structures are used for ensuring that air flow can normally circulate when the two positioning frames support and position the filter element, and the formed air channels can realize normal discharge of the air flow and avoid blockage;

a gas flow detection component is arranged in the hollow area of the upper positioning frame 6; the gas flow detection part can detect the gas amount discharged above the filter element, so that the detected ventilation quantity is compared with the standard ventilation quantity conveniently to judge whether the filter element is qualified.

As shown in fig. 2, the top surface of the fan box 5 is provided with a connecting ring 51, the connecting ring 51 is screwed into the inner bottom of the barrel 1, and the lower positioning frame 6 is fixedly embedded in the connecting ring 51; the mode of utilizing spiral assembly can realize the fast assembly of fan box and barrel, and the air outlet department at fan box is fixed to the locating rack down simultaneously, also can accomplish fixing of back lower locating rack simultaneously.

As shown in fig. 3, the upper locating frame 4 and the lower locating frame 6 have the same structure, the upper locating frame 4 includes an outer ring body 41, an inner ring body 42 and reinforcing bars 43, the inner part of the outer ring body 41 is provided with the concentric inner ring body 42, the outer ring body 41 is provided on the inner wall of the cover 3, the reinforcing bars 43 are distributed in a ring array, one end of each reinforcing bar 43 is fixedly connected with the inner ring body 42, the other end is fixedly connected with the outer ring body 41, and the area between the adjacent reinforcing bars 43 is a second ventilation hole 44; can carry out stable support location to the filter core terminal surface through interior ring body, outer ring body and enhancement strip, structural strength is high, and the second venthole of large tracts of land is the gas flow region, can make the gas flow speed faster.

The gas flow detection component comprises a first gas flowmeter 7 and a second gas flowmeter 8, the outer ring of the inner part of each second vent hole 44 is provided with the first gas flowmeters 7 distributed in an annular array, the inner ring of the inner part of each second vent hole 44 is provided with the second gas flowmeters 8 distributed in an annular array, the first gas flowmeters 7 are arranged opposite to the vent gaps 12, and the second gas flowmeters 8 are arranged opposite to the top surface of the filter element; the first gas flow meters 7 distributed annularly can collect the gas volume discharged from the ventilation gap at multiple points, so that whether the appearance of the filter element reaches the standard or not can be judged conveniently according to the ventilation volume; the second gas flowmeter 8 can detect the ventilation quantity of the filter element body so as to judge the bonding strength of the filter element, if the bonding strength is not high, the filter element can be blown away, the air exhaust quantity at the top of the filter element is increased, if the bonding strength reaches the standard, the filter element cannot be blown away, and the gas quantity detected by the second gas flowmeter is normal; all detected data can be transmitted to the control host, and after the internal software of the host is calculated, the result is displayed on a display screen and can be visually seen by workers;

as shown in fig. 2, the gas flow detecting component further includes a membrane 32, the inner wall of the first vent hole 31 is provided with membranes 32 distributed in an annular array, and the membranes 32 are of a light plastic structure; when the gas flows outwards, each plastic membrane can be blown up, workers can visually see the air volume according to the upward inclination angle of the membrane, and the detection efficiency can be assisted and accelerated; the diaphragm sets up in the top of last locating rack, then can not influence gas flowmeter's detection precision, and diaphragm and gas flowmeter mutual noninterference.

As shown in fig. 4, the outer wall of the cylinder 1 is provided with mounting holes 11 distributed in an annular array, a UV lamp 2 is embedded in each mounting hole 11, and the UV lamp 2 extends along the axial direction of the cylinder 1; the annularly distributed UV lamps can assist in curing glue solution from the outside, so that the prepared filter element can be fully cured in the cylinder without other curing procedures.

The detection method of the filter element for the air filter comprises the following steps:

s1, preparing a filter element:

winding the air filter paper on the outer wall of the mandrel, and pouring adhesive glue on the filter paper in the winding process to ensure that the filter paper is fixedly bonded with the mandrel and each layer of filter paper is fixedly bonded;

after the required number of turns of rolling, stopping the rotation of the mandrel, and cutting off redundant filter paper to obtain the filter element;

s2, assembling the filter element and the detection device:

inserting the filter element into the cylinder body 1 until the bottom end of the filter element is inserted and positioned with the lower positioning frame 6 at the bottom; before the filter element is inserted, the barrel is assembled with the fan box, the lower positioning frame is arranged at the bottom of the barrel, when the filter element is inserted, the bottom end extension part of the mandrel can be inserted into the inner ring body at the center of the lower positioning frame, and the winding surface of the bottom surface of the filter paper is abutted against the surface of the lower positioning frame, so that the lower part pre-positioning of the filter element can be realized;

screwing the cover 3 on the top of the cylinder 1, so that the top end of the filter element is inserted and positioned with the upper positioning frame 4 on the top of the filter element; at the moment, the filter element is stably and coaxially arranged in the cylinder body 1, and a ventilation gap 12 is reserved between the filter element and the cylinder body 1; after the filter element is inserted, the barrel needs to be sealed, the cover is spirally sleeved on the top of the barrel, the upper positioning frame can enter the barrel, the extending part of the top end of the mandrel can be inserted into the inner ring body of the upper positioning frame, and the top winding surface of the filter paper is abutted with the bottom surface of the upper positioning frame in an attaching mode, so that the filter element can be stably placed at the center line of the barrel and cannot be deviated, and the detection precision is guaranteed;

s3, detecting the appearance of the filter element:

s3.1, starting a fan box 5 at the bottom of the filter element, wherein the wind speed generated by the fan box 5 is V₁The air flow generated by the fan box 5 moves from bottom to top, and after passing through the lower positioning frame 4, the air flow is blocked by the bottom surface of the filter element, so that the air flow can only flow upwards through the ventilation gap 12, then the air flow passes through the upper positioning frame 6 and finally is discharged through the first ventilation hole 31 in the center of the cover 3; the step is used for forming a stable air duct before detection, so that the ventilation quantity of each detection point in unit time is constant; in addition, because the step is appearance detection and the filter element is just bonded, a larger wind speed is not needed, and the filter element which is just bonded is prevented from being blown away;

s3.2, after the airflow channel in the barrel is constructed stably, starting 4 first gas flowmeters 7 arranged at the outer ring of the vent of the upper positioning frame 4, and recording the flow of gas passing through the position in unit time by each first gas flowmeter 7; after the numerical value is stable, closing each first gas flowmeter 7 and each fan box 5; in the process of S3.1-S3.2, the glue in the filter element is dried by air flow, so that the filter element is cured; after the airflow is stable, the ventilation quantity of each position can be detected through the step so as to facilitate subsequent comparison and judgment, and the air blowing process can accelerate the volatilization of water in the glue solution and the solidification speed of the glue solution, so that the filter element can be solidified in the step so as to facilitate the continuous operation of a subsequent bonding strength test;

s3.3, comparing the difference value of each gas flow value detected in the S3.2 with the preset gas flow in the standard unit time, and judging whether the gas flow value is not in the range of the gas flow in the standard unit time;

if so, indicating that the appearance of the filter element is unqualified, and alarming to improve the condition that workers transfer the filter element to a finishing process;

if not, the filter element is qualified in appearance, and the process enters S4;

comparing each detection value with a standard value, if the value is not in the standard range, indicating that the gap at the detection point of the first gas flowmeter corresponding to the value is not in compliance, and if the gap is too large or too small, indicating that the appearance size of the whole filter element is unqualified; on the contrary, if all the components are in the qualified range, the size is qualified; the source of the standard numerical value is a pre-test, a worker puts a standard part into the cylinder body, and the same wind speed test is adopted for multiple times to obtain the standard ventilation volume in unit time;

s4, detecting the bonding strength of the filter element:

s4.1, starting a fan box at the bottom of the filter element, wherein the wind speed generated by the fan box is V₂，V₂Is a V₁2-3 times of the total weight of the composition; because the filter element is cured in S3, the bonding strength can be directly detected in the step, and the filter element is prevented from being blown away in actual use; in order to detect the bonding strength, the wind speed needs to be adjusted to the limit wind speed in the application environment so as to simulate the actual environment;

s4.2, after the airflow channel in the barrel is constructed stably, starting n second gas flowmeters 7 arranged at the inner ring of the ventilation opening of the upper positioning frame 4, and recording the flow of gas passing through the position in unit time by each second gas flowmeter 7; after the numerical value is stable, closing each second gas flowmeter and each fan box; the second gas flowmeter can measure the gas quantity discharged from the bottom to the top of the filter element body, so as to judge whether the filter element is loosened or not;

s4.3, comparing each gas flow value detected in the S4.2 with the preset standard ventilation of the filter element in unit time, and judging whether the gas flow value is out of the standard ventilation range;

if so, indicating that the bonding strength of the filter element is unqualified, and alarming to improve the condition that workers transfer the filter element to a finishing process;

if not, the bonding strength of the filter element is qualified, and the process enters S5;

comparing the data measured by the second gas flow instrument with a standard value, if the second gas flow instrument is loosened, the gap between the filter paper is increased, the exhaust air volume is increased, and part of the numerical values are not in the standard range; if no change exists, the bonding strength of the filter element reaches the standard, and all data are in the standard range; similarly, the standard ventilation of the filter element is obtained by multiple tests of the standard component under the same test environment;

in order to avoid the wind that the ventilation clearance was discharged to disturb filter core top, be equipped with between second gas flowmeter and the second gas flowmeter and separate the cover, the diameter that separates the cover is the same with the standard diameter of filter core, separates the cover like this and alright avoid two air currents to cross at last locating rack, improves and detects the precision.

And S5, removing the qualified filter element.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.