Filter membrane clamp for particulate matter sampling

Abstract

The utility model provides a filter membrane clamp for sampling particulate matters, which relates to the field of atmosphere detection and comprises an upper clamping ring and a lower clamping ring, an annular top plate is arranged at the top of the upper clamping ring; an annular bottom plate is arranged at the bottom of the lower clamping ring; an annular gasket is arranged between the upper clamping ring and the lower clamping ring; lifting assemblies are arranged on the left and right sides of the annular gasket; the lifting assembly comprises a rotating rod, a first sliding rod, a second sliding rod, a first sliding rail and a second sliding rail. The rotating rod is fixed on the annular gasket; the first sliding rail is arranged on the annular top plate; the second sliding rail is arranged on the annular bottom plate; one end of the first sliding rod is rotatably fixed on the rotating rod, and the other end of the first sliding rod can slide in the first sliding rail; one end of the second sliding rod is rotatably fixed to the rotating rod, and the other end of the second sliding rod can slide in the second sliding rail. The device can solve the problem that in the prior art, the operation is tedious when a filter membrane is placed and taken, the time cost of atmospheric particulate detection is reduced, and dust on the surface of the filter membrane is prevented from falling off due to rotating operation.

Description

Technical Field

[0001] The utility model relates to the field of atmosphere detection, in particular to a filter membrane clip for particulate matter sampling. Background Art

[0002] Particle sampling usually uses a filter membrane to collect particulate matter samples in the air; in order to enable the filter membrane to effectively obtain particulate matter, a suction fan is usually used to draw air, and the filter membrane is placed in an air circulation area. When the air passes through the filter membrane, the particulate matter in the air is collected on the filter membrane.

[0003] More specifically, particulate matter is collected by a sampling device equipped with a filter membrane clamp; Chinese patent application No. 201410004552.X discloses a membrane sampling device that can be raised and lowered, which consists of a frame and a cutter interface, a sealing ring, a filter membrane clamp, a filter membrane clamp fixing plate, a lifting air chamber and a lifting locking mechanism, and an air nozzle arranged in the frame; a lifting locking mechanism is arranged at the lower part of the lifting air chamber.

[0004] The Chinese patent application number 201720378486.1 discloses a filter membrane clamp, which includes an upper clamping ring and a lower clamping ring. The lower clamping ring includes an annular bottom plate and an internally threaded tube connected to the outer edge of the annular bottom plate and extending upward. The upper clamping ring includes an annular top plate and an externally threaded tube connected to the inner edge of the annular top plate and extending downward. The upper surface of the annular bottom plate is also provided with an annular groove, a coil spring is provided in the annular groove, and an annular gasket coaxial with the annular bottom plate is provided at the upper end of the coil spring. The outer diameter of the annular gasket is between the inner diameter of the internally threaded tube and the inner diameter of the externally threaded tube. When the upper clamping ring is tightened, the coil spring is in a compressed state. When the upper clamping ring and the lower clamping ring are separated, the upper end face of the annular gasket extends out of the upper end of the internally threaded tube, thereby directly sending the filter membrane located on the annular gasket to the outside of the internally threaded tube.

[0005] The filter membrane clamp provided by the above patent can be used in the sampling device provided by Chinese patent application number 201410004552.X. The filter membrane clamp is placed in a preset groove of the filter membrane clamp fixing plate, and a sealing ring is arranged between the upper end of the filter membrane clamp and the lower end of the cutter interface; during sampling, under the action of the vacuum pump, the air passes through the cutter interface, the filter membrane clamp, the lifting air chamber, and the air nozzle and enters the subsequent air path. The particulate matter sample in the air is blocked on the filter membrane when passing through the filter membrane in the filter membrane clamp; when the sampling is completed, the filter membrane clamp in the groove of the filter membrane clamp fixing plate is taken out, and the upper clamping ring of the filter membrane clamp is slowly unscrewed so that the coil spring lifts the annular gasket. When the upper clamping ring is separated from the lower clamping ring, the annular gasket and the filter membrane are pushed out of the internal threaded tube, so that when the filter membrane is taken out, the filter membrane is kept in a horizontal state when it is taken out, preventing dust on the upper surface of the filter membrane from falling off and avoiding affecting the final test results.

[0006] However, when using the filter membrane clamp provided by the above patent, every time the filter membrane is placed or taken out, the upper clamping ring needs to be rotated. This rotation operation is cumbersome and increases the time cost required for atmospheric particulate matter detection. Moreover, during the process of rotating the upper clamping ring of the filter membrane clamp to take out the filter membrane, due to the reason of the force application point, the filter membrane clamp is likely to tilt to varying degrees, causing the dust on the upper surface of the filter membrane to fall off and affecting the final detection result. Summary of the Invention

[0007] In view of the above problems, a filter membrane clamp for particulate matter sampling provided by the present invention can solve the problem of cumbersome operation when placing and taking out the filter membrane in the prior art, reduce the time cost required for atmospheric particulate matter detection, prevent the filter membrane clamp from tilting due to rotation operation, and avoid the dust on the upper surface of the filter membrane from falling off.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A filter membrane clamp for particulate matter sampling provided by the present invention includes an upper clamping ring and a lower clamping ring; a circular top plate is arranged at the top of the upper clamping ring; the inner ring wall of the circular top plate is fixed to the outer ring wall of the upper clamping ring; a circular bottom plate is arranged at the bottom of the lower clamping ring; the inner ring wall of the circular bottom plate is fixed to the outer ring wall of the lower clamping ring; a circular washer is arranged between the upper clamping ring and the lower clamping ring; the inner diameter of the inner circle of the circular washer is larger than the inner diameter of the bottom of the upper clamping ring and smaller than the outer diameter of the bottom of the upper clamping ring; the inner diameter of the inner circle of the circular washer is larger than the inner diameter of the top of the lower clamping ring and smaller than the outer diameter of the top of the lower clamping ring; the upper clamping ring, the lower clamping ring and the circular washer are concentric; the cross-section of the circular washer is smaller than the cross-sections of the upper clamping ring and the lower clamping ring;

[0010] Lifting components are arranged on both the left and right sides of the circular washer; each lifting component includes a rotating rod, a first sliding rod, a second sliding rod, a first sliding rail and a second sliding rail; one end of the rotating rod is fixed to the outer ring wall of the circular washer; the rotating rod is horizontally arranged; the first sliding rail is arranged on the circular top plate; the second sliding rail is arranged on the circular bottom plate; one end of the first sliding rod is rotatably fixed to the rotating rod, and the other end is slidable in the first sliding rail; one end of the second sliding rod is rotatably fixed to the rotating rod, and the other end is slidable in the second sliding rail; the starting point of the first sliding rail and the starting point of the second sliding rail are arranged in opposite directions; the end point of the first sliding rail and the end point of the second sliding rail are adjacent in the horizontal position; there is a gap between the end point of the first sliding rail and the end point of the second sliding rail in the horizontal position;

[0011] When the lower end surface of the upper clamping ring and the upper end surface of the lower clamping ring both press the annular gasket, the first sliding rod retreats to the starting point of the first slide rail, the first sliding rod can partially retract into the first slide rail, the second sliding rod retreats to the starting point of the second slide rail, and the second sliding rod can partially retract into the second slide rail; when the lower end surface of the upper clamping ring and the upper end surface of the lower clamping ring both leave the annular gasket, the first sliding rod is at the end point of the first slide rail, the second sliding rod is at the end point of the second slide rail, and the first sliding rod and the second sliding rod form a straight line.

[0012] For the filter membrane clamp for particulate matter sampling provided by the present utility model, preferably, first electromagnets are arranged at both the starting point and the end point of the first slide rail; second electromagnets are arranged at both the starting point and the end point of the second slide rail; a first iron block is arranged on one side of the first sliding rod sliding in the first slide rail; a second iron block is arranged on one side of the second sliding rod sliding in the second slide rail.

[0013] For the filter membrane clamp for particulate matter sampling provided by the present utility model, preferably, a first ring body is arranged on the upper surface of the annular bottom plate; the outer ring wall of the first ring body is flush with the outer ring wall of the annular bottom plate; a second ring body is further arranged on the upper surface of the annular bottom plate; the outer ring wall of the second ring body is fixed to the inner ring wall of the first ring body; the vertical height of the second ring body is lower than the vertical height of the first ring body; the second slide rail is located inside the ring of the second ring body;

[0014] A third ring body is arranged on the lower surface of the annular top plate; the first slide rail is located inside the ring of the third ring body; there is a spacing between the outer ring wall of the third ring body and the outer ring wall of the annular top plate;

[0015] When the lower end surface of the upper clamping ring and the upper end surface of the lower clamping ring both press the annular gasket, the upper surface of the first ring body can closely fit the lower surface of the annular top plate, and the upper surface of the second ring body can closely fit the lower surface of the third ring body.

[0016] For the filter membrane clamp for particulate matter sampling provided by the present utility model, preferably, the annular gasket includes a filter membrane supporting net for supporting the filter membrane; the filter membrane supporting net is arranged inside the ring of the annular gasket and is fixed to the inner ring wall of the annular gasket; the filter membrane supporting net is provided with a plurality of vertically penetrating ventilation holes; the upper surface of the filter membrane supporting net is flush with the upper surface of the annular gasket.

[0017] The above technical solution has the following advantages or beneficial effects:

[0018] The filter membrane clamp for particulate matter sampling provided by the present utility model includes an upper clamping ring, a lower clamping ring and an annular gasket. When the upper clamping ring and the lower clamping ring clamp the annular gasket, since the inner diameter of the annular gasket is larger than the inner diameter of the bottom of the upper clamping ring, the annular gasket can completely contact the air inhaled from the upper clamping ring, completely collect the particulate matter in the inhaled air, and since the annular gasket is smaller than the outer diameter of the bottom of the upper clamping ring, the annular gasket can stably contact the lower end surface of the upper clamping ring, which is conducive to forming a sealed space and preventing the inhaled air from escaping; similarly, the inner diameter of the annular gasket is larger than the inner diameter of the top of the lower clamping ring, which can ensure that all the air passing through the annular gasket is inhaled into the lower clamping ring, and being smaller than the outer diameter of the top of the lower clamping ring can ensure that a sealed ring is maintained during the process of air suction sampling, preventing the inhaled air from escaping, thus making the suction air pressure unstable and affecting the sampling effect of particulate matter in the air; the upper clamping ring, the lower clamping ring and the annular gasket are concentric, ensuring that the annular gasket always maintains a vertical movement state during the lifting movement process; making the cross-section of the annular gasket smaller than the cross-sections of the upper clamping ring and the lower clamping ring can better install the rotating rod fixed to the annular gasket and save the space between the upper clamping ring and the lower clamping ring.

[0019] The filter membrane clamp for particulate matter sampling provided by the present utility model further has lifting components arranged on both the left and right sides of the annular gasket. The two lifting components can act together to support the annular gasket to rise vertically when the upper clamping ring is lifted, and when the upper clamping ring stops moving, the annular gasket can stably maintain a horizontally suspended state by means of the two lifting components.

[0020] Among them, the lifting component includes a rotating rod, a first sliding rod, a second sliding rod, a first slide rail and a second slide rail; when the lower end surface of the upper clamping ring and the upper end surface of the lower clamping ring both press the annular gasket, the first sliding rod retreats to the starting point of the first slide rail. Here, the first sliding rod retreating to the starting point of the first slide rail refers to the movement state of the slidable end of the first sliding rod. When the first sliding rod slides to the starting point of the first slide rail, since the other end of the first sliding rod is rotatably fixed to the rotating rod, the included angle between the first sliding rod and the vertical line becomes larger. At this time, compared with the state where the first sliding rod and the second sliding rod form a straight line, the slope of the first sliding rod is larger, and the first sliding rod can be partially hidden into the first slide rail; similarly, when the second sliding rod retreats to the starting point of the second slide rail, the second sliding rod can also be partially retracted into the second slide rail.

[0021] When the lower end surface of the upper clamping ring and the upper end surface of the lower clamping ring both leave the annular gasket, and when the upper clamping ring cannot be lifted further, the first sliding rod is at the end point of the first slide rail, the second sliding rod is at the end point of the second slide rail, the first sliding rod and the second sliding rod form a straight line, and the annular gasket stably maintains a horizontally suspended state, facilitating the user to pick up the filter membrane from the annular gasket, avoiding the situation that the filter membrane clamp tilts when the filter membrane clamp is opened, and preventing the particulate matter collected on the filter membrane from being affected by the tilt and resulting in inaccurate particulate matter detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the following detailed description of the non-limiting embodiments with reference to the accompanying drawings, the present invention, its features, appearance and advantages will become more obvious. The same reference numerals indicate the same parts in all the drawings. The drawings are not deliberately drawn to scale, and the focus is on showing the gist of the present invention.

[0023] Figure 1 FIG. 1 is a schematic perspective view of a filter membrane clamp for particulate matter sampling provided in Embodiment 1 of the present invention.

[0024] Figure 2 FIG. 2 is a schematic top view of an annular gasket in a filter membrane clamp for particulate matter sampling provided in Embodiment 1 of the present invention.

[0025] Figure 3 FIG. 3 is a schematic structural view of a lower clamping ring part in a filter membrane clamp for particulate matter sampling provided in Embodiment 1 of the present invention.

[0026] Figure 4 FIG. Figure 3 is an enlarged schematic view of a part of FIG.

[0027] Figure 5 FIG. 4 is a schematic bottom view of an upper clamping ring part in a filter membrane clamp for particulate matter sampling provided in Embodiment 1 of the present invention.

[0028] Figure 6 FIG. Figure 5 is an enlarged schematic view of a part of FIG. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following is a further description of the present invention in conjunction with the accompanying drawings and specific embodiments, but it is not a limitation of the present invention.

[0030] Embodiment 1:

[0031] As shown in Figures 1 to 6As shown in the figure, a filter membrane clamp for particulate matter sampling provided in Embodiment 1 of the present utility model includes an upper clamping ring 1 and a lower clamping ring 2; a circular top plate 3 is provided at the top of the upper clamping ring 1; the inner ring wall of the circular top plate 3 is fixed to the outer ring wall of the upper clamping ring 1; a circular bottom plate 4 is provided at the bottom of the lower clamping ring 2; the inner ring wall of the circular bottom plate 4 is fixed to the outer ring wall of the lower clamping ring 2; a circular washer 5 is provided between the upper clamping ring 1 and the lower clamping ring 2; the inner diameter of the circular washer 5 is greater than the inner diameter of the bottom of the upper clamping ring 1 and less than the outer diameter of the bottom of the upper clamping ring 1; the inner diameter of the circular washer 5 is greater than the inner diameter of the top of the lower clamping ring 2 and less than the outer diameter of the top of the lower clamping ring 2; the upper clamping ring 1, the lower clamping ring 2 and the circular washer 5 are concentric; the cross-section of the circular washer 5 is smaller than the cross-sections of the upper clamping ring 1 and the lower clamping ring 2.

[0032] Lifting components 6 are provided on both the left and right sides of the circular washer 5; the lifting component 6 includes a rotating rod 61, a first sliding rod 62, a second sliding rod 63, a first slide rail 64 and a second slide rail 65; one end of the rotating rod 61 is fixed to the outer ring wall of the circular washer 5; the rotating rod 61 is horizontally arranged; the first slide rail 64 is provided on the circular top plate 3; the second slide rail 65 is provided on the circular bottom plate 4; one end of the first sliding rod 62 is rotatably fixed to the rotating rod 61, and the other end is slidable in the first slide rail 64; one end of the second sliding rod 63 is rotatably fixed to the rotating rod 61, and the other end is slidable in the second slide rail 65; the starting point of the first slide rail 64 is arranged in the opposite direction to the starting point of the second slide rail 65; the end point of the first slide rail 64 is adjacent to the end point of the second slide rail 65 in the horizontal position; there is a gap between the end point of the first slide rail 64 and the end point of the second slide rail 65 in the horizontal position.

[0033] When the lower end face of the upper clamping ring 1 and the upper end face of the lower clamping ring 2 both press the circular washer 5, the first sliding rod 62 retracts to the starting point of the first slide rail 64, and the first sliding rod 62 can partially retract into the first slide rail 64, the second sliding rod 63 retracts to the starting point of the second slide rail 65, and the second sliding rod 63 can partially retract into the second slide rail 65; when the lower end face of the upper clamping ring 1 and the upper end face of the lower clamping ring 2 both leave the circular washer 5, the first sliding rod 62 is at the end point of the first slide rail 64, the second sliding rod 63 is at the end point of the second slide rail 65, and the first sliding rod 62 and the second sliding rod 63 form a straight line.

[0034] When using the filter membrane clip for particulate matter sampling provided in Embodiment 1 of the present utility model, first place the filter membrane on the annular gasket 5, and clamp the annular gasket 5 through the upper clamping ring 1 and the lower clamping ring 2; after particulate matter sampling, remove the filter membrane clip from the sampling device and place it on a horizontal plane. Slowly lift the upper clamping ring 1 upward. At this time, the two sets of lifting components 6 located on the left and right sides of the annular gasket 5 move. The first sliding rod 62 moves from the starting point of the first sliding rail 64 on the annular top plate 3, and the second sliding rod 63 moves from the starting point of the second sliding rail 65 on the annular bottom plate 4. Both the first sliding rod 62 and the second sliding rod 63 stop at the end point of the sliding rail. During this period, since one end of each of the first sliding rod 62 and the second sliding rod 63 is rotatably fixed to the rotating rod 61, the included angles between the first sliding rod 62 and the second sliding rod 63 and the vertical line decrease, and the annular gasket 5 always moves upward slowly while maintaining a horizontal state; when both the first sliding rod 62 and the second sliding rod 63 stop at the end point of the sliding rail, the first sliding rod 62 and the second sliding rod 63 form a straight line, and the annular gasket 5 fixed to the rotating rod 61 is lifted from the upper end surface of the lower clamping ring 2 and maintains a horizontally suspended state. At this time, the user can gently use tweezers to take the filter membrane clip from the annular gasket 5 onto a clean piece of paper for subsequent operations.

[0035] The filter membrane clip for particulate matter sampling provided in Embodiment 1 of the present utility model includes an upper clamping ring 1, a lower clamping ring 2, and an annular gasket 5. When the upper clamping ring 1 and the lower clamping ring 2 clamp the annular gasket 5, since the inner diameter of the annular gasket 5 is larger than the inner diameter of the bottom of the upper clamping ring 1, the annular gasket 5 can completely contact the air inhaled from the upper clamping ring, and completely collect the particulate matter in the inhaled air. And since the annular gasket 5 is smaller than the outer diameter of the bottom of the upper clamping ring 1, the annular gasket 5 can stably contact the lower end surface of the upper clamping ring 1, which is conducive to forming a closed space and preventing the inhaled air from escaping; similarly, the inner diameter of the annular gasket 5 is larger than the inner diameter of the top of the lower clamping ring 2, which can ensure that all the air passing through the annular gasket 5 is inhaled into the lower clamping ring 2. Being smaller than the outer diameter of the top of the lower clamping ring 2 can ensure that a closed ring is maintained during the air suction sampling process, preventing the inhaled air from escaping, thereby making the suction air pressure unstable and affecting the sampling effect of particulate matter in the air; the upper clamping ring 1, the lower clamping ring 2, and the annular gasket 5 are concentric, ensuring that the annular gasket 5 always maintains a vertical movement state during the lifting movement process; making the cross-section of the annular gasket 5 smaller than the cross-sections of the upper clamping ring 1 and the lower clamping ring 2 can better install the rotating rod 61 fixed to the annular gasket 5 and save the space between the upper clamping ring 1 and the lower clamping ring 2.

[0036] As Figure 1 、 Figure 3 、 Figure 5As shown in the figure, for the filter membrane clip for particulate matter sampling provided in Embodiment 1 of the present utility model, lifting components 6 are further provided on both the left and right sides of the annular washer 5. The two lifting components 6 can act together to support the annular washer 5 to rise in the vertical direction when the upper clamping ring 1 is lifted. When the upper clamping ring 1 stops moving, the annular washer 5 can be stably maintained in a horizontally suspended state by means of the two lifting components 6;

[0037] Among them, the lifting component 6 includes a rotating rod 61, a first sliding rod 62, a second sliding rod 63, a first slide rail 64 and a second slide rail 65; when the lower end surface of the upper clamping ring 1 and the upper end surface of the lower clamping ring 2 both press the annular washer 5, the first sliding rod 62 retracts to the starting point of the first slide rail 64. Here, the first sliding rod 62 retracting to the starting point of the first slide rail 64 refers to the movement state of the slidable end of the first sliding rod 62. When the first sliding rod 62 slides to the starting point of the first slide rail 64, since the other end of the first sliding rod 62 is rotatably fixed to the rotating rod 61, the angle between the first sliding rod 62 and the vertical line becomes larger. At this time, compared with the state where the first sliding rod 62 and the second sliding rod 63 form a straight line, the slope of the first sliding rod 62 is larger, and the first sliding rod 62 can be partially hidden in the first slide rail 64; similarly, when the second sliding rod 63 retracts to the starting point of the second slide rail 65, the second sliding rod 63 can also be partially retracted into the second slide rail 65;

[0038] When the lower end surface of the upper clamping ring 1 and the upper end surface of the lower clamping ring 2 both leave the annular washer 5, and the upper clamping ring 1 cannot be lifted further, the first sliding rod 62 is at the end point of the first slide rail 64, the second sliding rod 63 is at the end point of the second slide rail 65, the first sliding rod 62 and the second sliding rod 63 form a straight line, and the annular washer 5 is stably maintained in a horizontally suspended state, which is convenient for the user to pick up the filter membrane from the annular washer 5, avoiding the situation that the filter membrane clip tilts when the filter membrane clip is opened, and preventing the particulate matter collected on the filter membrane from being affected by the tilt and resulting in inaccurate particulate matter detection.

[0039] As Figure 4 、 Figure 6 shown in the figure, for the filter membrane clip for particulate matter sampling provided in Embodiment 1 of the present utility model, preferably, first electromagnets 641 are provided at both the starting point and the end point of the first slide rail 64; second electromagnets 651 are provided at both the starting point and the end point of the second slide rail 65; a first iron block 621 is provided on one side of the first sliding rod 62 sliding in the first slide rail 64; a second iron block 631 is provided on one side of the second sliding rod 63 sliding in the second slide rail 65; here, the first iron block 621 and the second iron block 631 both refer to iron sliding blocks. The first sliding rod 62 is rotatably fixed to the first iron block 621 on one side of the first slide rail 64, the second sliding rod 63 is rotatably fixed to the second iron block 631 on one side of the second slide rail 65, the first iron block 621 can slide in the first slide rail 64, and the second iron block 631 can slide in the second slide rail 65;

[0040] First electromagnets 641 are arranged at both the starting point and the ending point of the first slide rail 64. And a first iron block 621 is arranged on one side of the first sliding rod 62 that slides on the first slide rail 64. The movement state of the first sliding rod 62 on the first slide rail 64 can be controlled by controlling the energization and de-energization of the first electromagnets 641 at the starting point and the ending point on the first slide rail 64. When it is necessary to move the first sliding rod 62 to the ending point of the first slide rail 64, the first electromagnet 641 at the ending point of the first slide rail 64 is energized, and the first electromagnet 641 at the starting point of the first slide rail 64 is de-energized. At this time, one end of the first sliding rod 62 fixed to the first iron block 631 is affected by the first iron block 621 and moves towards the energized first electromagnet 641. Since the first sliding rod 62 and the first iron block 631 are rotatably fixed, during the movement, the first sliding rod 62 will automatically adjust the inclination slope under the force condition, so that the first sliding rod 62 moves to the ending point of the first slide rail 64. Similarly, the movement of the second sliding rod 63 on the second slide rail 65 also follows the above operation. By adopting the method of electromagnets and iron blocks, the pressing operation and the opening operation of the upper clamping ring 1 and the lower clamping ring 2 can be conveniently controlled, the step process of manually opening the filter membrane clamp is simplified, the human influence when the filter membrane clamp is opened is reduced, and the accuracy of the particulate matter detection result on the filter membrane is improved.

[0041] As Figure 3 、 Figure 5 shown, the filter membrane clamp for particulate matter sampling provided in Embodiment 1 of the present invention. Preferably, in order to make the filter membrane clamp have better airtightness, a first ring body 41 is arranged on the upper surface of the annular bottom plate 4. The outer ring wall of the first ring body 41 is flush with the outer ring wall of the annular bottom plate 4. A second ring body 42 is also arranged on the upper surface of the annular bottom plate 4. The outer ring wall of the second ring body 42 is fixed to the inner ring wall of the first ring body 41. The vertical height of the second ring body 42 is lower than the vertical height of the first ring body 41. The first ring body 41 and the second ring body 42 form a downward stepped shape.

[0042] A third ring body 31 is arranged on the lower surface of the annular top plate 3. There is a gap between the outer ring wall of the third ring body 31 and the outer ring wall of the annular top plate 3. This gap can make the upper surface of the first ring body 41 contact the lower surface of the annular top plate 3, and the upper surface of the second ring body 42 contact the lower surface of the third ring body 31. The above-mentioned first ring body 41, second ring body 42, and third ring body 31 all refer to annular objects.

[0043] In order to realize the movement of the lifting assembly 6 in the vertical direction while strengthening the airtightness, the first slide rail 64 is arranged inside the ring of the third ring body 31, and the second slide rail 65 is arranged inside the ring of the second ring body 42. Thus, when the third ring body 31 and the second ring body 42 are in close contact, the use of the lifting assembly 6 will not be hindered.

[0044] When the lower end surface of the upper clamping ring 1 and the upper end surface of the lower clamping ring 2 both press the annular gasket 5, the upper surface of the first ring body 41 can closely fit the lower surface of the annular top plate 3, and the upper surface of the second ring body 42 can closely fit the lower surface of the third ring body 31. Through the cooperation of the first ring body 41 and the annular top plate 3, and the cooperation of the second ring body 42 and the third ring body 31, a stepped splicing method is formed, which can improve the airtightness and prevent the inhaled air from escaping from the gap between the upper clamping ring 1, the annular gasket 5 and the lower clamping ring 2, affecting the collection effect of particulate matter on the filter membrane and avoiding errors in the detection results.

[0045] As Figure 2 shown, for the filter membrane clamp for particulate matter sampling provided in Embodiment 1 of the present invention, preferably, in order to prevent the filter membrane from falling downward from the inside of the ring of the annular gasket 5 when placed on the annular gasket 5, a structure for supporting the filter membrane needs to be provided inside the ring of the annular gasket 5; the annular gasket 5 includes a filter membrane support net 51 for supporting the filter membrane. The filter membrane support net 51 is arranged inside the ring of the annular gasket 5 and is fixed to the inner wall of the ring of the annular gasket 5. In order to keep the filter membrane in an open state when receiving a downward suction force and prevent the filter membrane from falling off the annular gasket 5, a number of vertically penetrating ventilation holes 511 are provided in the filter membrane support net 51. The ventilation holes 511 can not only allow the inhaled air to pass through the ventilation holes 511 so that the filter membrane can collect particulate matter in the air, but also evenly distribute the suction force received by the filter membrane, so that the particulate matter in the air is evenly distributed on the filter membrane, facilitating the detection of particulate matter; at the same time, in order to more conveniently take out the filter membrane on the annular gasket 5, the upper surface of the filter membrane support net 51 is made flush with the upper surface of the annular gasket 5. At this time, the filter membrane is in a completely horizontal state, without protrusions or depressions, which is more conducive to taking out the filter membrane on the annular gasket 5 and avoiding the falling off of the particulate matter collected on the filter membrane, affecting the detection result of the particulate matter.

[0046] In summary, the filter membrane clamp for particulate matter sampling provided by the present invention can solve the problem of cumbersome operation in placing and taking the filter membrane in the prior art, realize reducing the time cost required for detecting atmospheric particulate matter, prevent the filter membrane clamp from tilting due to rotational operation, and avoid the dust on the upper surface of the filter membrane from falling off.

[0047] Those skilled in the art should understand that those skilled in the art can implement the above variations in combination with the prior art and the above embodiments, which will not be elaborated here. Such variations do not affect the essence of the present invention and will not be elaborated here.

[0048] The preferred embodiments of the present utility model have been described above. It should be understood that the present utility model is not limited to the above specific embodiments, and the devices and structures not described in detail therein should be understood to be implemented in a common manner in the art; any person skilled in the art can make many possible changes and modifications without departing from the technical solution of the present utility model, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of the present utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A filter membrane clip for particulate matter sampling, comprising an upper clamping ring and a lower clamping ring; a circular top plate is arranged at the top of the upper clamping ring; the inner ring wall of the circular top plate is fixed to the outer ring wall of the upper clamping ring; a circular bottom plate is arranged at the bottom of the lower clamping ring; the inner ring wall of the circular bottom plate is fixed to the outer ring wall of the lower clamping ring; characterized in that, An annular washer is arranged between the upper clamping ring and the lower clamping ring; the inner diameter of the inner circle of the annular washer is larger than the inner diameter of the bottom of the upper clamping ring and smaller than the outer diameter of the bottom of the upper clamping ring; the inner diameter of the inner circle of the annular washer is larger than the inner diameter of the top of the lower clamping ring and smaller than the outer diameter of the top of the lower clamping ring; the upper clamping ring, the lower clamping ring and the annular washer are concentric; the cross-section of the annular washer is smaller than the cross-sections of the upper clamping ring and the lower clamping ring. Lifting components are arranged on both the left and right sides of the annular washer; the lifting components include rotating rods, first sliding rods, second sliding rods, first sliding rails and second sliding rails; one end of the rotating rod is fixed on the outer wall of the ring of the annular washer; the rotating rod is horizontally arranged; the first sliding rail is arranged on the annular top plate; the second sliding rail is arranged on the annular bottom plate; one end of the first sliding rod is rotatably fixed on the rotating rod, and the other end is slidable in the first sliding rail; one end of the second sliding rod is rotatably fixed on the rotating rod, and the other end is slidable in the second sliding rail; the starting point of the first sliding rail and the starting point of the second sliding rail are arranged in the opposite direction; the end point of the first sliding rail and the end point of the second sliding rail are adjacent to each other in the horizontal position; there is a gap between the end point of the first sliding rail and the end point of the second sliding rail in the horizontal position. When the lower end surface of the upper clamping ring and the upper end surface of the lower clamping ring both press the annular washer, the first sliding rod retreats to the starting point of the first sliding rail, the first sliding rod can be partially retracted into the first sliding rail, the second sliding rod retreats to the starting point of the second sliding rail, and the second sliding rod can be partially retracted into the second sliding rail; when the lower end surface of the upper clamping ring and the upper end surface of the lower clamping ring both leave the annular washer, the first sliding rod is at the end point of the first sliding rail, the second sliding rod is at the end point of the second sliding rail, and the first sliding rod and the second sliding rod form a straight line.

2. The filter holder for particulate matter sampling according to claim 1, characterized in that, First electromagnets are arranged at both the starting point and the end point of the first sliding rail; second electromagnets are arranged at both the starting point and the end point of the second sliding rail; a first iron block is arranged on one side where the first sliding rod slides in the first sliding rail; a second iron block is arranged on one side where the second sliding rod slides in the second sliding rail.

3. The filter membrane clamp for particulate matter sampling according to claim 2, wherein A first ring body is arranged on the upper surface of the annular bottom plate; the outer wall of the ring of the first ring body is flush with the outer wall of the ring of the annular bottom plate; a second ring body is also arranged on the upper surface of the annular bottom plate; the outer wall of the ring of the second ring body is fixed to the inner wall of the ring of the first ring body; the vertical height of the second ring body is lower than the vertical height of the first ring body; the second sliding rail is located inside the ring of the second ring body. A third ring body is arranged on the lower surface of the annular top plate; the first sliding rail is located inside the ring of the third ring body; there is a distance between the outer wall of the ring of the third ring body and the outer wall of the ring of the annular top plate. When the lower end surface of the upper clamping ring and the upper end surface of the lower clamping ring both press the annular gasket, the upper surface of the first ring body can be closely attached to the lower surface of the annular top plate, and the upper surface of the second ring body can be closely attached to the lower surface of the third ring body.

4. The filter holder for particulate matter sampling according to claim 1, characterized in that, The annular gasket includes a filter membrane support net for supporting the filter membrane; the filter membrane support net is arranged inside the ring of the annular gasket and is fixed to the inner wall of the ring of the annular gasket; the filter membrane support net is provided with a number of vertically penetrating ventilation holes; the upper surface of the filter membrane support net is flush with the upper surface of the annular gasket.

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