Automatic membrane changing device for particulate matter sampling and membrane changing method

Abstract

The invention relates to an automatic film changing device for particulate matter sampling and a film changing method, belongs to the technical field of particulate matter sampling and testing, and solves the problems that an existing particulate matter sampling film changing device is large in size and complex in mechanism. The particulate matter sampling and automatic membrane changing device comprises a filter membrane transmission mechanism and a pressing and sampling mechanism; the filter membrane transmission mechanism is provided with a membrane carrying tray and a rotation driving assembly, and a plurality of filter membrane assemblies are detachably mounted on the membrane carrying tray; the compression sample introduction mechanism is provided with a membrane drag upper pressing block, a membrane drag lower pressing block and a lifting driving assembly, and the filter membrane assembly at the sampling position is located between the membrane drag upper pressing block and the membrane drag lower pressing block; the lifting driving assembly is configured to drive the film drag pressing block to ascend and descend; the lifting driving assembly is provided with a built-in air channel I, the film support lower pressing block is provided with an air channel II, and the film support upper pressing block is provided with an air channel III; the air passage I, the air passage II and the air passage III can be communicated to form a sealed sampling air passage when the lifting driving assembly drives the membrane drag pressing block to ascend. The automatic film changing device is simple in structure and small in size, and automatic film changing is achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of particle sampling and testing, and specifically relates to an automatic membrane changer and a membrane change method for particle sampling. Background Art

[0002] Most of the existing particulate matter sampling membrane changers have a bulky chassis, in which a large automatic slide and other moving parts are installed. When changing the membrane, the membrane is dragged to the designated position by the large slide, and then the membrane at the designated position is transported to the air inlet and outlet by a conveying device such as a conveyor belt or a slide, and then the air intake work begins; when the air intake work is completed, the used membrane is transported back to the large slide by the conveying device, and after the membrane is transported back to the large slide, the large slide is lifted up one point to perform the next sampling action. However, this type of particulate matter sampling membrane changer in the prior art is bulky and complex in structure, and is greatly affected by environmental factors in outdoor environments. For example, it is easily affected by high temperature environments or dust, etc., causing various mechanical problems. Summary of the invention

[0003] In view of the above analysis, an embodiment of the present invention aims to provide an automatic membrane changer for particle sampling and a membrane change method, so as to solve the problem that the particle sampling membrane changer in the prior art is large in size and complex in structure and is greatly affected by environmental factors in outdoor environments.

[0004] The object of the present invention is achieved in that: On the one hand, a particle sampling automatic membrane changer is provided, comprising: The filter membrane transmission mechanism comprises a membrane tray and a rotation drive assembly, wherein the membrane tray is detachably mounted with a plurality of filter membrane assemblies; the rotation drive assembly is configured to drive the membrane tray to rotate so that the plurality of filter membrane assemblies rotate to the sampling position in sequence; The compression injection mechanism comprises a membrane drag upper pressing block, a membrane drag lower pressing block and a lifting drive assembly, wherein the membrane drag upper pressing block is fixedly arranged directly above the membrane drag lower pressing block, and the filter membrane assembly at the sampling position is located between the membrane drag upper pressing block and the membrane drag lower pressing block; the lifting drive assembly is configured to drive the membrane drag lower pressing block to rise and fall; Among them, the lifting drive component is provided with a built-in air channel 1, the membrane drag lower pressure block is provided with an air channel 2, and the membrane drag upper pressure block is provided with an air channel 3; air channel 1, air channel 2 and air channel 3 can be connected to form a sealed sampling air path when the lifting drive component drives the membrane drag lower pressure block to rise.

[0005] Furthermore, airway one, airway two and airway three are coaxially arranged vertically.

[0006] Furthermore, the sampling gas circuit has a sampling gas inlet and a sampling gas outlet, the top port of the gas channel three is the sampling gas inlet, and the bottom port of the gas channel one is the sampling gas outlet.

[0007] Furthermore, the driving assembly includes a second reduction motor, a push rod gear and a push rod rack. The push rod rack is arranged vertically and can be raised and lowered. The push rod rack is a hollow structure, and the hollow channel of the push rod rack is airway one. The top of the push rod rack is sealed and connected to the membrane dragging block. A push rod gear is provided on the output shaft of the second reduction motor, and the push rod gear is meshed with the teeth on the outer wall of the push rod rack. The second reduction motor drives the push rod gear to rotate to realize the lifting and lowering of the push rod rack.

[0008] Furthermore, the driving assembly also includes a clamping portion carrier block and a linear bearing, and the push rod rack is arranged on the clamping portion carrier block through the linear bearing; and the second reduction motor is fixedly arranged on the clamping portion carrier block.

[0009] Furthermore, the number of the linear bearings is two, and the two linear bearings are arranged at the upper and lower parts of the push rod rack and are located at the upper and lower sides of the push rod gear.

[0010] Furthermore, the filter membrane assembly includes a membrane drag and a filter membrane arranged on the membrane drag, and a plurality of holes for placing the membrane drag are arranged on the membrane carrier tray.

[0011] Furthermore, the filter membrane transmission mechanism also has a membrane-carrying top plate and a membrane-carrying bottom plate, which are fixedly connected, and the membrane-carrying bottom plate is fixedly arranged on the carrier block of the clamping part through a connecting seat; the membrane dragging pressure block is fixed on the membrane-carrying top plate, and the membrane-carrying tray is rotatably arranged in the space between the membrane-carrying top plate and the membrane-carrying bottom plate.

[0012] Furthermore, the rotation drive assembly includes a reduction motor 1, which is installed on the film carrier bottom plate. The reduction motor 1 is connected to the tray shaft through a coupling, and the upper part of the tray shaft is fixedly connected to the center of the film carrier tray.

[0013] Furthermore, guide rollers are provided between the film carrying tray and the film carrying bottom plate, and between the film carrying tray and the film carrying top plate, and the guide rollers are configured to limit the up and down floating of the film carrying tray.

[0014] Furthermore, a photoelectric sensor is provided on the film carrier top plate, and a plurality of shading plates are provided at positions corresponding to the filter membrane assemblies on the film carrier tray, and the shading plates can rotate with the film carrier tray; when the shading plates rotate to the blocking position of the photoelectric sensor, the filter membrane assembly at the corresponding position rotates into place, and the film carrier tray stops rotating.

[0015] Furthermore, a first sealing ring is provided between the bottom end surface of the upper pressure block of the membrane drag and the upper surface of the membrane drag, a second sealing ring is provided between the top end surface of the lower pressure block of the membrane drag and the lower surface of the membrane drag, and the top end of the push rod rack and the lower pressure block of the membrane drag are sealed and connected by a third sealing ring.

[0016] Furthermore, the first sealing ring, the second sealing ring and the third sealing ring are all O-rings; the bottom end surface of the membrane drag upper pressure block is provided with a first annular groove, the first sealing ring is installed in the first annular groove and protrudes from the bottom end surface of the membrane drag upper pressure block; the top end surface of the membrane drag lower pressure block is provided with a second annular groove, the second sealing ring is installed in the second annular groove and protrudes from the top end surface of the membrane drag lower pressure block.

[0017] On the other hand, a particle sampling membrane changing method is provided, which uses the above-mentioned particle sampling automatic membrane changing device to automatically change the membrane.

[0018] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: a) The automatic membrane changer for particulate matter sampling provided by the present invention realizes automatic membrane change by pressing the sample feeding mechanism and the filter membrane transmission mechanism, replacing manual membrane change, greatly extending the operation and maintenance cycle of the equipment. Each time, the operation and maintenance personnel only need to remove the old membrane in the equipment and replace it with a new membrane to achieve continuous operation of the equipment and reduce the operation and maintenance costs.

[0019] b) The automatic membrane changer for particulate matter sampling provided by the present invention optimizes the running route of the membrane drag by compressing the sample feeding mechanism and the filter membrane transmission mechanism, shortens the running track, and minimizes the overall volume of the membrane changer to the greatest extent without affecting the operation. It is convenient to carry and can be placed arbitrarily next to the equipment in need. It only needs to be connected to the gas path of other equipment in need and replaced with a filter membrane suitable for other equipment. It is compatible with various types of equipment in need. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the structure of the automatic membrane changer for particle sampling provided by the present invention from a first angle; Figure 2 A second angle structural schematic diagram of the automatic membrane changer for particle sampling provided by the present invention; Figure 3 A front view of the automatic membrane changer for particle sampling provided by the present invention; Figure 4 A cross-sectional view of the automatic membrane changer for particle sampling provided by the present invention; Figure 5 A schematic diagram of the partial structure of the automatic film changer for particles provided by the present invention; Figure 6This is a schematic cross-sectional view of the local structure of the automatic particle film changer provided by the present invention.

[0022] Reference numerals: 1. Membrane drag upper pressure block; 2. Film carrier top plate; 3. Guide roller; 4. Membrane drag; 5. Turntable bearing; 6. Photoelectric sensor; 7. Shading plate; 8. Film carrier tray; 9. Reducer motor one; 10. Reducer motor two; 11. Film carrier bottom plate; 12. Push rod gear; 13. Push rod rack; 14. Membrane drag lower pressure block; 15. Tray shaft; 16. Coupling; 17. Clamping block; 18. Linear bearing; 19. Sampling gas inlet; 20. Sampling gas outlet; 21. Airway one; 22. Airway two; 23. Airway three; 24. First sealing ring; 25. Second sealing ring; 26. Third sealing ring; 27. Connecting seat. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. It should be noted that, in the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be combined, separated, interchanged and / or rearranged with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0024] In the accompanying drawings, the size and relative size of components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments may be implemented differently, a specific process sequence may be performed in a different order than described. For example, two successively described processes may be performed substantially simultaneously or in an order opposite to the order described. In addition, the same reference numerals represent the same components.

[0025] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, assemblies and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups. It should also be noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values ​​and / or the values ​​provided that will be recognized by those of ordinary skill in the art.

[0026] Example 1 A specific embodiment of the present invention, as Figures 1 to 6 As shown, a particle sampling automatic membrane changer is disclosed, comprising: The compression sampling mechanism comprises a membrane dragging upper pressing block 1, a membrane dragging lower pressing block 14 and a lifting and lowering driving assembly. The membrane dragging upper pressing block 1 is fixedly arranged directly above the membrane dragging lower pressing block 14. The lifting and lowering driving assembly is configured to drive the membrane dragging lower pressing block 14 to rise when sampling, and seal and squeeze with the membrane dragging upper pressing block 1 to achieve the connection of the sampling gas path, and drive the membrane dragging lower pressing block 14 to descend after the sampling is completed, and separate from the membrane dragging upper pressing block 1 to achieve the disconnection of the sampling gas path; The filter membrane transmission mechanism comprises a membrane tray 8 and a rotation drive assembly, on which a plurality of filter membrane assemblies are detachably mounted; the rotation drive assembly is configured to drive the membrane tray 8 to rotate, so that the plurality of filter membrane assemblies are rotated to the sampling position in sequence; the filter membrane assembly at the sampling position is located between the membrane drag upper pressing block 1 and the membrane drag lower pressing block 14, and during the sampling process, the plurality of filter membrane assemblies are rotated in sequence to the space between the membrane drag upper pressing block 1 and the membrane drag lower pressing block 14 for sampling; Among them, the lifting drive component is provided with an air channel 1 21, the membrane drag lower pressure block 14 is provided with an air channel 2 22, and the membrane drag upper pressure block 1 is provided with an air channel 3 23; the air channel 1 21, the air channel 2 22 and the air channel 3 23 are coaxially arranged vertically; wherein, when the membrane drag lower pressure block 14 rises and is squeezed into contact with the membrane drag upper pressure block 1, each time sampling is performed, the filter membrane component at the sampling position is sealed and connected between the air channel 2 22 and the air channel 3 23, and can be connected with the air channel 1 21, the air channel 22 and the air channel 3 23 under the drive of the lifting drive component to form a sealed sampling air path, and then, air is taken in from the sampling gas inlet 19 of the membrane drag upper pressure block 1 to filter the gas to be tested.

[0027] The present application integrates the air channel into the lifting drive assembly, making the sampling gas circuit structure simpler and eliminating the need to set up more additional gas pipelines for connection, thereby simplifying the structure of the sampling gas circuit, making the structure of the device more compact and achieving a miniaturized design.

[0028] In this embodiment, the sampling gas circuit has a sampling gas inlet 19 and a sampling gas outlet 20. The sampling gas inlet 19 is arranged on the membrane drag upper pressure block 1. The top port of airway three 23 is the sampling gas inlet 19, and the bottom port of airway one 21 is the sampling gas outlet 20. The sampling gas outlet 20 is connected to the detection equipment through a pipeline.

[0029] In one of the optional embodiments, the driving assembly includes a reduction motor 10, a push rod gear 12 and a push rod rack 13. The push rod rack 13 is arranged vertically and can be raised and lowered. The push rod rack 13 is a hollow structure. The hollow channel of the push rod rack 13 is an airway 21. The sampling gas outlet 20 is arranged on the push rod rack 13, which is the port of the push rod rack 13; the top of the push rod rack 13 is sealed with the membrane drag lower pressure block 14; the output shaft of the reduction motor 10 is provided with a push rod gear 12, and the push rod gear 12 is engaged with the teeth on the outer wall of the push rod rack 13. The reduction motor 10 drives the push rod gear 12 to rotate to realize the lifting and lowering of the push rod rack 13. For example, when the reduction motor 10 drives the push rod rack 13 to move upward through the push rod gear 12, it will drive the membrane drag lower pressure block 14 to push the membrane drag 4 upward to support the membrane drag upper pressure block 1, ensuring that the membrane drag is pressed tightly at both ends to achieve the sealing of the overall air path.

[0030] Furthermore, the driving assembly also includes a clamping portion carrier block 17 and a linear bearing 18, and the push rod rack 13 is arranged on the clamping portion carrier block 17 through the linear bearing 18; the reduction motor 10 is fixedly arranged on the clamping portion carrier block 17. Exemplarily, the number of linear bearings 18 is two, and the two linear bearings 18 are arranged on the upper and lower parts of the push rod rack 13 and are located on the upper and lower sides of the push rod gear 12, so as to realize a more flexible up and down movement of the rack, and the distance between the two linear bearings 18 can meet the required lifting distance of the push rod rack 13, and will not interfere with the push rod gear 12 during the working process.

[0031] In this embodiment, the filter membrane transmission mechanism also has a membrane-carrying top plate 2 and a membrane-carrying bottom plate 11. The membrane-carrying top plate 2 is fixedly connected to the membrane-carrying bottom plate 11 by screws, and the membrane-carrying bottom plate 11 is fixedly arranged on the clamping portion carrier block 17 by a connecting seat; the membrane dragging pressure block 1 is fixed on the membrane-carrying top plate 2, and the membrane-carrying tray 8 is rotatably arranged in the space between the membrane-carrying top plate 2 and the membrane-carrying bottom plate 11.

[0032] In this embodiment, the rotation drive assembly includes a reduction motor 9, which is installed on the film carrier base plate 11. The reduction motor 9 drives the film carrier tray 8 to rotate through a coupling 16 and a tray shaft 15. Specifically, the reduction motor 9 is connected to the tray shaft 15 through a coupling 16, and the upper part of the tray shaft 15 is fixedly connected to the center of the film carrier tray 8.

[0033] In one of the optional embodiments, guide rollers 3 are provided between the film carrier tray 8 and the film carrier bottom plate 11, and between the film carrier tray 8 and the film carrier top plate 2, and the guide rollers 3 are configured to limit the up and down floating of the film carrier tray 8. Exemplarily, three guide rollers 3 are respectively installed on the film carrier bottom plate 11 and the film carrier top plate 2, which are used to limit the up and down floating of the film carrier tray 8 and ensure the rotation stability of the film carrier tray 8. Furthermore, annular grooves are provided on the upper and lower surfaces of the film carrier tray 8, and the positions of the grooves correspond to the guide rollers 3. The guide rollers 3 on the film carrier bottom plate 11 and the film carrier top plate 2 are embedded in the grooves and can roll in the grooves, thereby limiting the up and down floating of the film carrier tray 8.

[0034] In this embodiment, the automatic membrane changing device for particle sampling also includes a control system, which is configured to control the start and stop of reduction motor 1 9 and reduction motor 2 10 according to a set program to achieve automatic control of the automatic membrane changing process of particle sampling.

[0035] In one of the optional embodiments, a photoelectric sensor 6 is provided on the film carrier top plate 2, and a plurality of shading plates 7 are provided on the film carrier tray 8 at positions corresponding to the filter membrane components, and the shading plates 7 can rotate with the film carrier tray 8; when the shading plates 7 rotate to the blocking position of the photoelectric sensor 6, the filter membrane components at the corresponding positions rotate into place, and the film carrier tray 8 stops rotating. The control system is connected to the photoelectric sensor 6 for signal control, and can receive the filter membrane component rotation into place signal sent by the photoelectric sensor 6, and can control the reduction motor 9 to operate based on the received filter membrane component rotation into place signal. In other words, the shading plates 7 can rotate with the film carrier tray 8, and can cover the photoelectric sensor 6 when rotating into place, and trigger the photoelectric sensor 6 to send the filter membrane component rotation into place signal to the control system, and the control system stops the film carrier tray 8 from rotating by controlling the reduction motor 9.

[0036] In this embodiment, the filter membrane assembly includes a membrane drag 4 and a filter membrane disposed on the membrane drag 4. The membrane drag 4 is used to install and hold the filter membrane. The membrane tray 8 is provided with a plurality of holes for placing the membrane drag 4. For example, the membrane tray 8 has 6 holes. Among the plurality of holes of the membrane tray 8, the hole rotated between the membrane drag upper pressing block 1 and the membrane drag lower pressing block 14 is the sampling hole. Only one filter membrane assembly is sampled at a time. The filter membrane assembly that has completed sampling is rotated away from the sampling hole, and the next filter membrane assembly that has not been sampled is rotated to the sampling hole for sampling, thereby realizing the switching and sampling of a plurality of filter membrane assemblies in sequence.

[0037] In order to improve the sealing of the connected sampling gas path, sealing rings are provided between the membrane drag 4 and the membrane drag upper pressing block 1, between the membrane drag 4 and the membrane drag lower pressing block 14, and between the push rod rack 13 and the membrane drag lower pressing block 14. Specifically, a first sealing ring 24 is provided between the bottom end surface of the membrane drag upper pressing block 1 and the upper surface of the membrane drag 4, a second sealing ring 25 is provided between the top end surface of the membrane drag lower pressing block 14 and the lower surface of the membrane drag 4, and the top end of the push rod rack 13 and the membrane drag lower pressing block 14 are sealed and connected by a third sealing ring 27.

[0038] Furthermore, the first sealing ring 24, the second sealing ring 25, and the third sealing ring 27 are all O-rings; the bottom end surface of the membrane drag upper pressure block 1 is provided with a first annular groove, and the first sealing ring 24 is installed in the first annular groove and protrudes from the bottom end surface of the membrane drag upper pressure block 1; the top end surface of the membrane drag lower pressure block 14 is provided with a second annular groove, and the second sealing ring 25 is installed in the second annular groove and protrudes from the top end surface of the membrane drag lower pressure block 14.

[0039] This embodiment also provides a particle sampling and membrane changing method. During the sampling process, the particle sampling automatic membrane changing device mentioned above in this embodiment is used to change the membrane.

[0040] The particle sampling and membrane replacement method specifically includes the following steps: Install the filter membrane on the membrane drag 4, put the membrane drag 4 with the filter membrane installed into the hole of the membrane tray 8, start the reduction motor 9, and the reduction motor 9 drives the membrane tray 8 to rotate. When the shading plate 7 rotates to the blocking position of the photoelectric sensor 6, the shading plate 7 triggers the photoelectric sensor 6, and the reduction motor 9 is turned off. The film tray 8 stops rotating, and another membrane drag 4 with the filter membrane installed is placed in the hole upstream of the photoelectric sensor 6. Repeat the above steps until all the holes have the membrane drags placed.

[0041] After all membrane drags 4 are installed, start the reduction motor 10, drive the push rod rack 13 to rise through the push rod gear 12, and drive the membrane drag lower pressing block 14 to rise until the membrane drag lower pressing block 14 presses the membrane drag 4 and the membrane drag lower pressing block 14 from bottom to top, and the membrane drag 4 is clamped between the membrane drag upper pressing block 1 and the membrane drag lower pressing block 14. At this time, the sampling gas path is in a connected state. Start the air sampling, the gas enters from the sampling gas inlet 19 of the sampling gas path, the gas passes through the filter membrane on the membrane drag 4, and the large particles of impurities are filtered out. The remaining gas flows out from the sampling gas outlet 20 through the filter membrane and enters the detection equipment to obtain the detection results. The sampling period is set as needed, for example, it is switched once a week. When the filter membrane needs to be switched, the reduction motor 10 is started, and the reduction motor 10 drives the push rod rack 13 to descend through the push rod gear 12, so that the membrane drag lower pressing block 14 moves downward to release the membrane drag 4, and the sampling gas path changes from the connected state to the disconnected state. At this time, the reduction motor 19 is started, and the reduction motor 19 drives the film carrier tray 8 to rotate until the shading plate 7 of the next hole position rotates to the blocking position of the photoelectric sensor 6, triggering the photoelectric sensor 6, and the reduction motor 19 stops, so that the film carrier tray 8 stops rotating. At this time, the next sampling hole position has been switched, and the reduction motor 10 is started again, so that the membrane drag lower pressing block 14 presses the membrane drag 4 and the membrane drag lower pressing block 14 from bottom to top, and the sampling gas path is in a connected state again, and the air intake sampling starts. Repeat the above steps until the filter membranes on all the hole positions are all used up, then all the membrane drags 4 can be removed and replaced with new filter membranes to achieve automatic membrane replacement.

[0042] Compared with the prior art, the automatic membrane changing device and membrane changing method for particle sampling provided in this embodiment have the following beneficial effects: 1. Automatic membrane replacement is achieved by pressing the sample injection mechanism and the filter membrane transmission mechanism, replacing manual membrane replacement, which greatly extends the operation and maintenance cycle of the equipment. Each time, the operation and maintenance personnel only need to remove the old membrane in the equipment and replace it with a new membrane to achieve continuous operation of the equipment and reduce the operation and maintenance costs.

[0043] 2. Compared with the existing particulate matter sampling membrane changer which has a bulky chassis, the membrane changer of the present application has a simpler and more compact structure. By pressing the sample feeding mechanism and the filter membrane transmission mechanism, the membrane dragging route is optimized, the running track is shortened, and the overall volume of the membrane changer is minimized without affecting the operation. Due to the small size of the device, it is easy to carry and can be placed next to the required equipment at will. It only needs to be connected to the gas path of other required equipment and replaced with a filter membrane suitable for other equipment. It is compatible with various required equipment.

[0044] 3. The structure of the automatic membrane changer for particulate matter sampling is simpler, with fewer moving parts for automatic membrane change. The start and stop of the membrane changer can be accurately controlled by photoelectric sensors, reducing the probability of problems with the membrane changer. At the same time, some mechanical problems can also be solved remotely through software control.

[0045] 4. The film tray is limited by the guide rollers to float up and down, making the film tray rotate more smoothly and reducing mechanical failures.

[0046] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only the specific implementation method of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A particle sampling automatic membrane changer, characterized in that: include: The filter membrane transmission mechanism comprises a membrane tray and a rotation drive assembly, wherein the membrane tray is detachably mounted with a plurality of filter membrane assemblies; the rotation drive assembly is configured to drive the membrane tray to rotate so that the plurality of filter membrane assemblies rotate to the sampling position in sequence; The compression injection mechanism comprises a membrane dragging upper pressing block, a membrane dragging lower pressing block and a lifting drive assembly, wherein the membrane dragging upper pressing block is fixedly arranged directly above the membrane dragging lower pressing block, and the filter membrane assembly at the sampling position is located between the membrane dragging upper pressing block and the membrane dragging lower pressing block; the lifting drive assembly is configured to drive the membrane dragging lower pressing block to rise and fall; Among them, the lifting drive component is provided with a built-in air channel 1, the membrane drag lower pressure block is provided with an air channel 2, and the membrane drag upper pressure block is provided with an air channel 3; the air channel 1, the air channel 2 and the air channel 3 can be connected to form a sealed sampling air path when the lifting drive component drives the membrane drag lower pressure block to rise.

2. The automatic membrane changer for particle sampling according to claim 1, characterized in that: The air duct one, the air duct two and the air duct three are coaxially arranged vertically.

3. The automatic membrane changer for particle sampling according to claim 2, characterized in that: The sampling gas circuit has a sampling gas inlet and a sampling gas outlet, the top port of the gas channel three is the sampling gas inlet, and the bottom port of the gas channel one is the sampling gas outlet.

4. The automatic membrane changer for particle sampling according to claim 2, characterized in that: The driving assembly includes a second reduction motor, a push rod gear and a push rod rack. The push rod rack is arranged vertically and can be raised and lowered. The push rod rack is a hollow structure, and the hollow channel of the push rod rack is the first airway. The top end of the push rod rack is sealed and connected to the membrane drag-down pressure block. A push rod gear is provided on the output shaft of the second reduction motor, and the push rod gear is meshed with teeth on the outer wall of the push rod rack. The second reduction motor drives the push rod gear to rotate to realize the lifting and lowering of the push rod rack.

5. The automatic membrane changer for particle sampling according to claim 4, characterized in that: The driving assembly also includes a clamping portion carrier block and a linear bearing, and the push rod rack is arranged on the clamping portion carrier block through the linear bearing; the second reduction motor is fixedly arranged on the clamping portion carrier block.

6. The automatic membrane changer for particle sampling according to claim 5, characterized in that: The filter membrane assembly comprises a membrane drag and a filter membrane arranged on the membrane drag, and the membrane carrier tray is provided with a plurality of holes for placing the membrane drag.

7. The automatic membrane changer for particle sampling according to claim 6, characterized in that: The membrane transmission mechanism also comprises a membrane carrying top plate and a membrane carrying bottom plate, the membrane carrying top plate and the membrane carrying bottom plate are fixedly connected, and the membrane carrying bottom plate is fixedly arranged on the pressing portion carrier block via a connecting seat; The film dragging pressing block is fixed on the film carrying top plate, and the film carrying tray is rotatably arranged in the space between the film carrying top plate and the film carrying bottom plate.

8. The automatic membrane changer for particle sampling according to claim 7, characterized in that: A photoelectric sensor is provided on the film carrier top plate, and a plurality of shading plates are provided on the film carrier tray at positions corresponding to the filter membrane assembly, and the shading plates can rotate along with the film carrier tray; When the shading plate rotates to the shielding position of the photoelectric sensor, the filter membrane assembly at the corresponding position rotates into place, and the membrane carrier tray stops rotating.

9. The automatic membrane changer for particle sampling according to claim 6, characterized in that: A first sealing ring is provided between the bottom end surface of the upper pressure block of the membrane drag and the upper surface of the membrane drag, a second sealing ring is provided between the top end surface of the lower pressure block of the membrane drag and the lower surface of the membrane drag, and the top end of the push rod rack and the lower pressure block of the membrane drag are sealed and connected by a third sealing ring.

10. A particle sampling and membrane replacement method, characterized in that: Automatic membrane replacement is performed using the automatic membrane replacement device for particle sampling as described in any one of claims 1 to 9.

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