Double-path VOCs (Volatile Organic Compounds) sampler

Abstract

The utility model belongs to the technical field of gas sampling equipment, particularly relates to a two-way VOCs (volatile organic compounds) sampler, and provides the following scheme aiming at the problems that an existing two-way VOCs sampler is poor in compatibility with a gas collecting bottle and a rubber tube is easy to fall off when being used: the two-way VOCs sampler comprises an analyzer, the gas collecting bottle, a screwing type clamping structure and a locking structure; when the gas collection bottle is used, only the gas collection bottle needs to be placed in the inner clamping pipe, then the inner tooth sleeve is rotated clockwise, under the meshing action of the inner meshing teeth and the driven gears, the driven gears on the same horizontal plane can drive the clamping half-moon plates to rotate clockwise at the same time, and the inner clamping half-moon plates can be gradually close to the gas collection bottle and clamp the gas collection bottle in the rotating process; and the binding band is used for winding and binding the joint of the gas outlet end of the gas collecting bottle and the rubber pipe, so that the gas tightness of the rubber pipe and the gas outlet end of the gas collecting bottle is improved, and meanwhile, the rubber pipe is prevented from falling off from the gas outlet end of the gas collecting bottle.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas sampling equipment, and in particular relates to a dual-path VOCs sampler. Background Art

[0002] A dual-path VOCs (volatile organic compound) sampler is a device used to collect VOCs components in gas samples for environmental monitoring and scientific research analysis. It separates target VOCs from the gas phase through physical adsorption, chemical absorption, or condensation enrichment techniques and collects them into a gas collection bottle. The dual-path VOCs sampler then absorbs and analyzes the VOCs in the gas collection bottle. However, existing dual-path VOCs samplers typically use an integrated design for the trough used to secure the gas collection bottle. This not only has poor compatibility, but its size can only accommodate gas collection bottles of specific specifications. This means that if a gas collection bottle is damaged, the user must purchase the same model. Otherwise, using a gas collection bottle of an incompatible size will prevent it from being effectively retained by the trough. During the sampling process, equipment vibration or airflow impact can easily cause the gas collection bottle to tilt or even fall over, and the shaking of the bottle can also loosen the gas line connection. Existing designs typically use rubber tubes as the connecting components between the gas collection bottle and the sampler gas line. However, the lack of a fixing method at the interface between the rubber tube, the bottle body, and the equipment makes the rubber tube easily fall off during use, leading to sampling failure. Utility Model Content

[0003] (1) Technical problems solved

[0004] The utility model provides a dual-path VOCs sampler to solve the problems that the existing dual-path VOCs sampler has poor compatibility with gas collecting bottles of different models and the rubber tube is easy to fall off during use.

[0005] (2) Technical content

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A dual-path VOCs sampler includes an analyzer and a gas collecting bottle. A mounting platform is provided on one side of the analyzer. Two bottle body embedding grooves are provided in the mounting platform. Both bottle body embedding grooves are provided with a screw-type clamping structure.

[0008] The screw-type clamping structure includes an inner clamping tube, an inner tooth sleeve and multiple sets of clamping components. The inner clamping tube is fixedly connected to the bottle body embedded groove, the inner tooth sleeve is rotatably connected to the bottle body embedded groove, and the inner tooth sleeve is rotatably sleeved on the outside of the inner clamping tube;

[0009] The clamping assembly includes a plurality of clamping menisci, each of which is rotatably connected to the inner clamping tube, and each of the clamping menisci is fixedly connected to a driven gear, and each of the driven gears is meshed with the inner gear sleeve;

[0010] The gas collecting bottle is placed in the inner card tube. An air inlet interface is provided on one side of the analyzer. Two drying bottles are installed on the mounting platform. The air inlet and air outlet ends of the drying bottles are fixedly connected with rubber tubes.

[0011] A locking structure is provided on the top of the driven gear.

[0012] Furthermore, the centers of the inner clamping tube and the inner gear sleeve are on the same axis, and a plurality of connecting shafts are fixedly plugged into the inner clamping tube in a circumferential manner. The inner clamping tube is provided with hollow grooves corresponding to the plurality of clamping assemblies, and part of the shaft body of the connecting shaft is connected to the hollow groove. The clamping meniscus and the driven gear fixed to the clamping meniscus are rotatably sleeved on the corresponding connecting shaft.

[0013] The inner wall of the internal gear sleeve is circumferentially provided with internal meshing teeth, and the driven gear is meshed with the internal meshing teeth.

[0014] Furthermore, an inner docking ear is fixedly connected to the inner wall of the bottle body embedding groove in a circumferential manner, and the free end of the inner docking ear is in sliding contact with the outer wall of the inner tooth sleeve; an outer docking ear is fixedly connected to the outer wall of the inner tooth sleeve in a circumferential manner, and the free end of the outer docking ear is in sliding contact with the inner wall of the inner tooth sleeve;

[0015] A plurality of groups of limiting rings are fixedly embedded on the plurality of inner docking ears, and a plurality of first springs are sleeved on each group of limiting rings. The first springs are located between adjacent inner docking ears and outer docking ears, and the two ends of the first springs are respectively in contact with the corresponding inner docking ears and outer docking ears.

[0016] Furthermore, an inner groove is provided on the top of the inner tooth sleeve;

[0017] A plurality of limiting grooves are circumferentially arranged on the top of the edge of the mounting platform close to the bottle body embedding groove, one side of the limiting groove is provided with a first vertical surface, and the side of the limiting groove opposite to the first vertical surface is provided with a first inclined surface.

[0018] Furthermore, an inner cavity is formed at the top of the internal gear sleeve, and the top of the inner cavity is open. The locking structure includes a sliding block slidably connected to the inner cavity, one end of the sliding block passes through the internal gear sleeve and extends into one of the limiting grooves, and the sliding block passing through the internal gear sleeve is provided with a second vertical surface on a side close to the first vertical surface, and a second inclined surface on a side close to the first inclined surface;

[0019] The first vertical surface and the second vertical surface are adapted to each other;

[0020] The first inclined surface is adapted to the second inclined surface;

[0021] A shift rod is arranged on the top of the sliding block, and the shift rod passes through the top of the inner cavity and extends outside.

[0022] Furthermore, an isolation plate is provided in the inner cavity, which divides the inner cavity into an avoidance cavity and a spring receiving cavity by the isolation plate. The sliding block is slidably connected in the spring receiving cavity. The sliding block is symmetrically fixed with a sliding rod on one side close to the isolation plate. The free end of the sliding rod passes through the isolation plate and extends into the avoidance cavity. A second spring is sleeved on the sliding rod, and one end of the second spring abuts against the isolation plate and the other end abuts against the sliding block.

[0023] Furthermore, a pointing portion is provided on the top of the internal tooth sleeve.

[0024] Furthermore, a rubber sleeve is provided on the outer wall of the clamping meniscus.

[0025] Furthermore, the analyzer is symmetrically fixedly connected to two sides with shafts, which are rotatably connected to the same cover. The bottom of the cover is fixedly connected to a plurality of straps, one side of the straps is provided with a furry surface and the other side is provided with a hook surface.

[0026] Furthermore, the shaft rod and the blocking cover are interference fit.

[0027] (3) Beneficial effects

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. In the present invention, when clamping gas collecting bottles of different models, it is only necessary to place the gas collecting bottle in the inner clamping tube, and then rotate the inner gear sleeve clockwise. Through the meshing action of the internal meshing teeth and the driven gear, multiple driven gears on the same horizontal plane will drive the clamping meniscus to rotate clockwise at the same time. During the rotation process, the inner clamping meniscus will gradually approach the gas collecting bottle and clamp it, thereby improving the adaptability to gas collecting bottles of different models.

[0030] 2. In the present invention, the locking structure can prevent the internal gear sleeve from rotating and causing the internal clamping meniscus to automatically reset due to the action of the second spring.

[0031] Third, in the present invention, a binding band is used to wrap and tighten the connection between the gas outlet end of the gas collecting bottle and the rubber tube, thereby further improving the airtightness between the rubber tube and the gas outlet end of the gas collecting bottle and preventing the rubber tube from falling off from the gas outlet end of the gas collecting bottle during operation.

[0032] 4. In the present invention, a fleece surface is provided on one side of the strap and a hook surface is provided on the other side. During the winding process, the strap can be quickly fixed by simply pressing the hook surface on the fleece surface. When removing it later, it can be quickly and conveniently removed by simply pulling the fleece surface and the hook surface apart. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A three-dimensional schematic diagram of the entire utility model;

[0034] Figure 2 A schematic diagram of another perspective of the present invention;

[0035] Figure 3 This is a schematic diagram of the bottle body embedding groove in the utility model;

[0036] Figure 4 This is a schematic diagram of the inner clamping tube, clamping meniscus and driven gear in the present invention;

[0037] Figure 5 This is a schematic diagram of the internal tooth sleeve in the present utility model;

[0038] Figure 6 for Figure 5 A partial enlarged schematic diagram of point A in the middle;

[0039] Figure 7 It is a partial cross-sectional view of the internal tooth sleeve in the utility model;

[0040] Figure 8 for Figure 7 A partial enlarged schematic diagram of point B in the middle;

[0041] Figure 9 Schematic diagram of the isolation plate, avoidance cavity and spring storage cavity in the present invention;

[0042] Figure 10 It is a schematic diagram of the second vertical plane in the present utility model;

[0043] Figure 11 Schematic diagram of the inner docking lug, the first spring and the outer docking lug in the present invention;

[0044] Figure 12 for Figure 11 A partial enlarged schematic diagram of point C in the middle;

[0045] Figure 13 This is a schematic diagram of the cover and strap in the utility model.

[0046] Figure: 1, analyzer; 101, air inlet interface; 11, shaft; 2, gas collecting bottle; 3, mounting platform; 301, bottle body embedded groove; 3011, inner docking ear; 302, limit groove; 3021, first vertical surface; 3022, first inclined surface; 4, inner clamping tube; 401, hollow groove; 41, clamping meniscus; 42, driven gear; 43, connecting shaft; 44, limit ring; 45, first spring; 4 6. Rubber sleeve; 5. Internal tooth sleeve; 501. Inner groove; 502. Avoidance cavity; 503. Spring storage cavity; 504. Pointing part; 51. Internal meshing teeth; 52. External docking ear; 53. Sliding block; 5301. Second vertical surface; 5302. Second inclined surface; 54. Push rod; 55. Isolation plate; 56. Sliding rod; 57. Second spring; 6. Cover; 7. Strap; 8. Drying bottle; 9. Rubber tube. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] Example 1

[0049] like Figures 1-13 As shown, a dual-path VOCs sampler includes an analyzer 1 and a gas collecting bottle 2. A mounting platform 3 is provided on one side of the analyzer 1. Figure 3 As shown, the mounting platform 3 is provided with two bottle body embedding grooves 301, and both bottle body embedding grooves 301 are provided with a screw-type clamping structure;

[0050] like Figure 2-Figure 12 As shown, the screw-type clamping structure includes an inner clamping tube 4, an inner tooth sleeve 5 and multiple sets of clamping components. The inner clamping tube 4 is fixedly connected to the bottle body embedding groove 301.

[0051] The inner tooth sleeve 5 is rotatably connected to the bottle body embedding groove 301 and is rotatably sleeved on the outside of the inner clamping tube 4, wherein the centers of the inner clamping tube 4 and the inner tooth sleeve 5 are on the same axis;

[0052] like Figure 3As shown, the clamping assembly includes a plurality of clamping menisci 41, each of which is rotatably connected to the inner clamping tube 4. A plurality of clamping menisci 41 are fixedly connected to a driven gear 42, and the driven gears 42 are meshed with the inner gear sleeve 5. Specifically, a plurality of connecting shafts 43 are fixedly plugged into the inner clamping tube 4 in a circumferential manner. The inner clamping tube 4 is provided with hollow grooves 401 corresponding to the plurality of clamping assemblies. Part of the shaft body of the connecting shaft 43 is connected to the hollow groove 401. The clamping menisci 41 and the driven gears 42 fixed to the clamping menisci 41 are rotatably sleeved on the corresponding connecting shafts 43.

[0053] like Figure 5 As shown, the inner wall of the internal gear sleeve 5 is provided with internal meshing teeth 51 in a circumferential manner. Figure 4-Figure 7 and combined Figure 11 and Figure 12 , the driven gear 42 is meshed with the internal meshing teeth 51;

[0054] The gas collecting bottle 2 is placed in the inner card tube 4, and an air inlet interface 101 is provided on one side of the analyzer 1. Two drying bottles 8 for drying gas are installed on the mounting platform 3. The air inlet and air outlet ends of the drying bottles 8 are fixedly connected with rubber tubes 9. During installation, the gas collecting bottle 2 is placed in the inner card tube 4, and then the rubber tube 9 fixedly connected to the air inlet end of the drying bottle 8 is sleeved on the air outlet end of the gas collecting bottle 2, and then the rubber tube 9 fixedly connected to the air outlet end of the drying bottle 8 is sleeved on the air inlet interface 101;

[0055] When clamping gas collecting bottles 2 of different models, it is only necessary to place the gas collecting bottle 2 in the inner clamping tube 4, and then rotate the inner gear sleeve 5 clockwise. Through the meshing action of the internal meshing teeth 51 and the driven gear 42, multiple driven gears 42 on the same horizontal plane will drive the clamping meniscus 41 to rotate clockwise at the same time. During the rotation process, the inner clamping meniscus 41 will gradually approach the gas collecting bottle 2 and clamp it.

[0056] Further, such as Figure 4 As shown, a rubber sleeve 46 is provided on the outer wall of the clamping meniscus 41. The rubber sleeve 46 can prevent the outer wall of the clamping meniscus 41 from directly contacting the gas collecting bottle 2, thereby preventing the outer wall of the gas collecting bottle 2 from being scratched by the clamping meniscus 41 and causing wear of the gas collecting bottle 2.

[0057] Further, combined Figure 3 、 Figure 5 and Figure 11 The inner wall of the bottle body embedding groove 301 is fixedly connected with an inner docking ear 3011 in a circumferential manner, and the free end of the inner docking ear 3011 is in sliding contact with the outer wall of the inner tooth sleeve 5; the outer wall of the inner tooth sleeve 5 is fixedly connected with an outer docking ear 52 in a circumferential manner, and the free end of the outer docking ear 52 is in sliding contact with the inner wall of the inner tooth sleeve 5;

[0058] A plurality of groups of limiting rings 44 are fixedly embedded on the plurality of inner docking ears 3011, and a plurality of first springs 45 are sleeved on each group of limiting rings 44. The first springs 45 are located between adjacent inner docking ears 3011 and outer docking ears 52, and the two ends of the first springs 45 are respectively in contact with the corresponding inner docking ears 3011 and outer docking ears 52. The first springs 45 can be limited by the provided limiting rings 44.

[0059] Specifically, when the internal gear sleeve 5 rotates clockwise, it drives the external docking lug 52 to rotate in the same direction. During the rotation, the external docking lug 52 gradually approaches the corresponding internal docking lug 3011, and at the same time, the first spring 45 between the external docking lug 52 and the corresponding internal docking lug 3011 is also compressed.

[0060] A locking structure is provided on the top of the driven gear 42. Specifically, an inner groove 501 is provided on the top of the inner gear sleeve 5.

[0061] like Figure 7 and Figure 8 As shown, the mounting platform 3 is provided with a plurality of limiting grooves 302 in a circumferential manner at the top of the edge near the bottle body embedding groove 301, a first vertical surface 3021 is provided on one side of the limiting groove 302, and a first inclined surface 3022 is provided on the side of the limiting groove 302 opposite to the first vertical surface 3021.

[0062] Further, such as Figure 7-10 As shown, an inner cavity is formed at the top of the internal gear sleeve 5, and the top of the inner cavity is open. The locking structure includes a sliding block 53 slidably connected to the inner cavity. One end of the sliding block 53 passes through the internal gear sleeve 5 and extends into one of the limiting grooves 302. The sliding block 53 passing through the internal gear sleeve 5 is provided with a second vertical surface 5301 on the side close to the first vertical surface 3021, and a second inclined surface 5302 on the side close to the first inclined surface 3022.

[0063] The first vertical surface 3021 and the second vertical surface 5301 are adapted to each other;

[0064] The first inclined surface 3022 is adapted to the second inclined surface 5302;

[0065] A shift rod 54 is provided on the top of the sliding block 53 , and the shift rod 54 passes through the top of the inner cavity and extends outward.

[0066] Furthermore, an isolation plate 55 is provided in the inner cavity, which divides the inner cavity into an avoidance cavity 502 and a spring receiving cavity 503 through the isolation plate 55. The sliding block 53 is slidably connected in the spring receiving cavity 503. The sliding block 53 is symmetrically fixedly connected with a sliding rod 56 on one side close to the isolation plate 55. The free end of the sliding rod 56 passes through the isolation plate 55 and extends into the avoidance cavity 502. A second spring 57 is sleeved on the sliding rod 56. One end of the second spring 57 abuts against the isolation plate 55, and the other end abuts against the sliding block 53.

[0067] When the second spring 57 is in a compressed state, it stretches and resets, pushing the end of the sliding block 53 with the second inclined surface 5302 into the corresponding limiting groove 302;

[0068] When the sliding block 53 moves to the corresponding limiting groove 302, the first vertical surface 3021 set by the limiting groove 302 can limit the side of the sliding block 53 with the second vertical surface 5301, and then limit the adjusted internal gear sleeve 5, to prevent the rotating internal gear sleeve 5 from driving the internal clamping meniscus 41 to automatically reset due to the action of the second spring 57.

[0069] Further, such as Figure 5 As shown, a pointing portion 504 is provided on the top of the internal gear sleeve 5 for prompting the staff to drive the internal gear sleeve 5 in a rotation direction.

[0070] When the work is finished and the gas collecting bottle 2 needs to be taken out, the lever 54 is pushed to drive the sliding block 53 to slide in the direction close to the avoidance cavity 502, and then the end of the sliding block 53 with the second inclined surface 5302 is separated from the corresponding limit groove 302. At this time, the first spring 45 in the compressed state will stretch and reset, and reset the internal gear sleeve 5 by pushing the corresponding external docking ear 52, and then drive the internal clamping meniscus 41 to reset through the internal gear sleeve 5, thereby canceling the clamping of the gas collecting bottle 2.

[0071] Example 2

[0072] like Figures 1-13 As shown, this embodiment makes the following improvements on the basis of the first embodiment: further, as Figure 2 As shown, the two sides of the analyzer 1 are symmetrically fixedly connected with shafts 11, and the two shafts 11 are rotatably connected to the same blocking cover 6. When working, the blocking cover 6 is rotated to the top of the gas collecting bottle 2. The gas collecting bottle 2 can be protected by the provided blocking cover 6, wherein the shaft 11 and the blocking cover 6 have an interference fit, thereby increasing the friction between the shaft 11 and the blocking cover 6 and preventing the blocking cover 6 from falling off.

[0073] like Figure 2 As shown, a plurality of straps 7 are fixedly connected to the bottom of the blocking cover 6 .

[0074] Specifically, the rubber tube 9 fixedly connected to the air inlet end of the drying bottle 8 is sleeved onto the air outlet end of the gas collecting bottle 2, and then the rubber tube 9 fixedly connected to the air outlet end of the drying bottle 8 is sleeved onto the air inlet interface 101. After the sleeves are completed, the connection between the air outlet end of the gas collecting bottle 2 and the rubber tube 9 is wound and tied with a band 7. This further improves the airtightness between the rubber tube 9 and the air outlet end of the gas collecting bottle 2 and prevents the rubber tube 9 from falling off from the air outlet end of the gas collecting bottle 2 during operation. The method of using the band 7 to wrap and tie the air inlet interface 101 with the corresponding rubber tube 9 is the same as described above and will not be repeated here.

[0075] like Figure 2 As shown, one side of the strap 7 is provided with a furry surface, as shown in FIG. Figure 13 As shown, a hook surface is provided on the other side of the strap 7. During the winding process, the hook surface of the strap 7 can be quickly fixed by pressing it against the fleece surface. When removing it later, it is only necessary to gently pull the fleece surface and the hook surface apart, which is convenient and quick.

[0076] In summary, the workflow of this utility model is as follows:

[0077] Before use, the gas collecting bottle 2 is placed in the corresponding inner clamping tube 4, and then the staff puts the index finger into the inner pull groove 501 and pulls the inner pull groove 501 clockwise, thereby driving the internal gear sleeve 5 to rotate clockwise. When the internal gear sleeve 5 rotates clockwise, through the meshing action of the internal meshing teeth 51 and the driven gear 42, the multiple driven gears 42 on the same horizontal plane will drive the clamping meniscus 41 to rotate clockwise at the same time. During the rotation process, the inner clamping meniscus 41 will gradually approach the gas collecting bottle 2 and clamp it.

[0078] During the rotation process, the second inclined surface 5302 on the sliding block 53 comes into contact with the first inclined surface 3022, and as the first inclined surface 3022 rotates, it presses the second inclined surface 5302. At this time, the sliding block 53 slides in the direction of the avoidance cavity 502, and part of the rod body of the sliding rod 56 slides into the avoidance cavity 502. At the same time, the second spring 57 is compressed. When the sliding block 53 moves clockwise to the next limiting groove 302, the first inclined surface 3022 on the previous limiting groove 302 stops pressing the second inclined surface 5302. At this time, the compressed second spring 57 stretches and resets, pushing the end of the sliding block 53 with the second inclined surface 5302 into the corresponding limiting groove 302.

[0079] Then the rubber tube 9 fixedly connected to the air inlet end of the drying bottle 8 is sleeved on the air outlet end of the gas collecting bottle 2, and then the rubber tube 9 fixedly connected to the air outlet end of the drying bottle 8 is sleeved on the air inlet interface 101. After the sleeve is completed, the connection between the air outlet end of the gas collecting bottle 2 and the rubber tube 9 is wound and tied with the binding tape 7 to further improve the air tightness between the rubber tube 9 and the air outlet end of the gas collecting bottle 2, and at the same time prevent the rubber tube 9 from falling off from the air outlet end of the gas collecting bottle 2 during operation. The method of using the binding tape 7 to wind and tie the air inlet interface 101 and the corresponding rubber tube 9 is the same as described above and will not be repeated here.

[0080] After tightening, turn on the analyzer 1, and the analyzer 1 generates negative pressure at the air inlet interface 101. At this time, the gas in the gas collecting bottle 2 flows into the drying bottle 8 through the rubber tube 9, and then flows from the drying bottle 8 to the air inlet interface 101 for sampling and analysis by the analyzer 1.

[0081] However, as is well known to those skilled in the art, the working principles and wiring methods of the analyzer 1, gas collecting bottle 2 and drying bottle 8 are commonplace and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0082] The above different embodiments can be combined, replaced and used in conjunction with each other.

[0083] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0084] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dual-path VOCs sampler, comprising an analyzer (1) and a gas collecting bottle (2), characterized in that: A mounting platform (3) is provided on one side of the analyzer (1), two bottle body embedding grooves (301) are provided in the mounting platform (3), and a screw-type clamping structure is provided in both of the two bottle body embedding grooves (301); The screw-type clamping structure comprises an inner clamping tube (4), an inner tooth sleeve (5) and a plurality of clamping components, wherein the inner clamping tube (4) is fixedly connected to the bottle body embedded groove (301), the inner tooth sleeve (5) is rotatably connected to the bottle body embedded groove (301), and the inner tooth sleeve (5) is rotatably sleeved on the outside of the inner clamping tube (4); The clamping assembly comprises a plurality of clamping menisci (41), each of the clamping menisci (41) being rotatably connected to the inner clamping tube (4), and each of the plurality of clamping menisci (41) being fixedly connected to a driven gear (42), and each of the driven gears (42) being meshed with the inner gear sleeve (5); The gas collecting bottle (2) is placed in the inner clamping tube (4), an air inlet interface (101) is provided on one side of the analyzer (1), two drying bottles (8) are installed on the mounting platform (3), and rubber tubes (9) are fixedly connected to the air inlet end and the air outlet end of the drying bottle (8); A locking structure is provided on the top of the driven gear (42).

2. The dual-path VOCs sampler according to claim 1, characterized in that: The centers of the inner clamping tube (4) and the inner gear sleeve (5) are on the same axis, and a plurality of connecting shafts (43) are fixedly plugged into the inner clamping tube (4) in a circumferential manner. The inner clamping tube (4) is provided with hollow grooves (401) corresponding to the plurality of clamping components, and a part of the shaft body of the connecting shaft (43) is connected to the hollow groove (401), and the clamping meniscus (41) and the driven gear (42) fixed on the clamping meniscus (41) are rotatably sleeved on the corresponding connecting shaft (43); The inner wall of the internal gear sleeve (5) is circumferentially provided with internal meshing teeth (51), and the driven gear (42) meshes with the internal meshing teeth (51).

3. The dual-path VOCs sampler according to claim 2, characterized in that: An inner docking ear (3011) is fixedly connected to the inner wall of the bottle body embedding groove (301) in a circumferential manner, and the free end of the inner docking ear (3011) is in sliding contact with the outer wall of the inner tooth sleeve (5); an outer docking ear (52) is fixedly connected to the outer wall of the inner tooth sleeve (5) in a circumferential manner, and the free end of the outer docking ear (52) is in sliding contact with the inner wall of the inner tooth sleeve (5); A plurality of groups of limiting rings (44) are fixedly embedded on the plurality of inner butt joint ears (3011), and a plurality of first springs (45) are sleeved on each group of limiting rings (44). The first springs (45) are located between adjacent inner butt joint ears (3011) and outer butt joint ears (52), and two ends of the first springs (45) are respectively in contact with the corresponding inner butt joint ears (3011) and outer butt joint ears (52).

4. The dual-path VOCs sampler according to claim 1, characterized in that: An inner groove (501) is formed on the top of the inner tooth sleeve (5); The mounting platform (3) is provided with a plurality of limiting grooves (302) in a circumferential manner at the top of the edge close to the bottle body embedding groove (301), a first vertical surface (3021) is provided on one side of the limiting groove (302), and a first inclined surface (3022) is provided on the side of the limiting groove (302) opposite to the first vertical surface (3021).

5. The dual-path VOCs sampler according to claim 4, characterized in that: An inner cavity is formed at the top of the inner tooth sleeve (5), and the top of the inner cavity is open. The locking structure includes a sliding block (53) slidably connected in the inner cavity, one end of the sliding block (53) passes through the inner tooth sleeve (5) and extends into one of the limiting grooves (302), and a second vertical surface (5301) is provided on the side of the sliding block (53) passing through the inner tooth sleeve (5) close to the first vertical surface (3021), and a second inclined surface (5302) is provided on the side close to the first inclined surface (3022); The first vertical surface (3021) and the second vertical surface (5301) are adapted to each other; The first inclined surface (3022) and the second inclined surface (5302) are adapted to each other; A shift rod (54) is provided on the top of the sliding block (53), and the shift rod (54) passes through the top of the inner cavity and extends outside.

6. The dual-path VOCs sampler according to claim 5, characterized in that: An isolation plate (55) is provided in the inner cavity, and the inner cavity is divided into an avoidance cavity (502) and a spring receiving cavity (503) by the isolation plate (55). The sliding block (53) is slidably connected in the spring receiving cavity (503). A sliding rod (56) is symmetrically fixedly connected to one side of the sliding block (53) close to the isolation plate (55). The free end of the sliding rod (56) passes through the isolation plate (55) and extends into the avoidance cavity (502). A second spring (57) is sleeved on the sliding rod (56). One end of the second spring (57) abuts against the isolation plate (55), and the other end abuts against the sliding block (53).

7. The dual-path VOCs sampler according to claim 5 or 6, characterized in that: The top of the internal gear sleeve (5) is provided with a pointing portion (504).

8. The dual-path VOCs sampler according to claim 1 or 2, characterized in that: A rubber sleeve (46) is sleeved on the outer wall of the clamping meniscus (41).

9. The dual-path VOCs sampler according to claim 1, characterized in that: The two sides of the analyzer (1) are symmetrically fixedly connected with shafts (11), and the two shafts (11) are rotatably connected to the same blocking cover (6). The bottom of the blocking cover (6) is fixedly connected with a plurality of straps (7), and one side of the straps (7) is provided with a furry surface and the other side is provided with a hook surface.

10. The dual-path VOCs sampler according to claim 9, characterized in that: The shaft (11) and the blocking cover (6) are interference fit.

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