Automatic air sampling and detecting device

Abstract

The utility model relates to air sampling detection technical field, concretely relates to an automatic air sampling detection device, it includes the gas cylinder, the gas cylinder axial outer wall fixedly connected with fixed cylinder, automatic sampling subassembly, automatic sampling subassembly includes sealed sliding connection in the control piston of gas cylinder inner wall, the gas cylinder axial outer wall rotationally connected with long strip screw, the fixed cylinder inner wall fixedly installed with small -size motor, the end of long strip screw away from the gas cylinder with the output of small -size motor passes through the shaft coupling fixed connection, the utility model can realize automatic air sampling, can more accurately control sampling time and sampling amount, ensure air sampling data accuracy, and can seal the gas cylinder in time after sampling is completed, avoid air sampling amount to appear error, further ensure sampling air's data accuracy and subsequent detection authenticity.

Description

Technical Field

[0001] This utility model relates to the field of air sampling and detection technology, specifically to an automatic air sampling and detection device. Background Technology

[0002] Air sampling and testing involves collecting a certain volume of air sample using specific equipment and then using laboratory analysis or on-site monitoring techniques to qualitatively or quantitatively detect pollutants such as particulate matter, harmful gases, and microorganisms in the sample. This allows for the determination of whether air quality meets standards, identification of pollution sources, and assessment of their impact on the environment or human health. It is widely used in environmental monitoring, indoor air quality assessment, and industrial waste gas detection.

[0003] Existing technologies often have the following problems when used: Currently used air sampling and detection devices are usually quite simple and rely heavily on manual operation. During the air sampling process, the sampling time and air volume need to be manually controlled, which can easily lead to large errors compared to the designed sampling volume, resulting in inaccurate air sampling data. Furthermore, after sampling, the sampling container usually needs to be manually sealed, and it is difficult to seal the air inlet of the sampling container in time, which can also cause deviations in the air sampling volume and affect the authenticity of subsequent air composition detection. Utility Model Content

[0004] To address the aforementioned shortcomings of existing technologies, this utility model provides an automatic air sampling and detection device that effectively solves the problems of large errors in sampling time and sampling volume control, and difficulty in timely sealing of sampling containers leading to sampling volume deviations, thus affecting the accuracy and authenticity of detection data.

[0005] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides an automatic air sampling and detection device, comprising: A gas storage cylinder, wherein a fixed cylinder is fixedly connected to the outer wall of the gas storage cylinder along its axial direction; An automatic sampling assembly includes a control piston that is sealed and slidably connected to the inner wall of a gas storage cylinder. A long lead screw is rotatably connected to the outer wall of the gas storage cylinder. A small motor is fixedly installed on the inner wall of a fixed cylinder. The end of the long lead screw away from the gas storage cylinder is fixedly connected to the output end of the small motor via a coupling. A slider is threaded onto the outer peripheral wall of the long lead screw. Two guide rods are fixedly connected to the outer wall of the slider. The two guide rods penetrate the axial side wall of the gas storage cylinder and are fixedly connected to the control piston. The outer circumferential wall of the gas storage tank is fixedly connected with a sealing and protective component.

[0006] Furthermore, the sealing and protection assembly includes two slide rails fixedly connected to the outer circumferential wall of the gas storage cylinder. Pins are slidably connected to the inner sides of the two slide rails. Concave brackets are fixedly connected to the ends of the two pins located outside the slide rails. Sealing plugs are fixedly connected to the inner sides of the concave brackets. An air extraction nozzle is fixedly connected to the axial side wall of the gas storage cylinder. The sealing plugs are selectively interference-fitted with the air extraction nozzle.

[0007] Furthermore, the sealing and protection assembly also includes an electric push rod fixedly installed on the circumferential outer wall of the gas storage cylinder. The telescopic end of the electric push rod is fixedly connected to the concave bracket. A PLC controller is fixedly installed on the outer wall of the fixed cylinder. The PLC controller, the electric push rod, the small motor, and the external power supply are electrically connected.

[0008] Furthermore, two through holes are provided on the axial sidewall of the gas storage cylinder, and the two guide rods slide in contact with the axial sidewall of the gas storage cylinder through the through holes, and silicone rubber sealing rings are fixedly connected to both through holes.

[0009] Furthermore, the sealing plug is configured in a conical shape, the suction nozzle is configured in a funnel shape, and the maximum outer diameter of the sealing plug is larger than the inner diameter of the suction nozzle inlet.

[0010] Furthermore, a gripping ring is fixedly connected to the outer circumferential wall of the gas storage cylinder, and the outer circumferential wall of the gripping ring is provided with several anti-slip grooves.

[0011] The technical solution provided by this utility model has the following advantages compared with the known prior art: This invention incorporates an automatic sampling component. By driving and controlling the piston to slide and seal within the air storage cylinder and gradually move away from the suction nozzle, the pressure inside the air storage cylinder gradually decreases. External air pressure then pushes the air to be sampled into the air storage cylinder, thereby enabling automatic air sampling. This allows for more precise control of sampling time and volume, ensuring the accuracy of air sampling data.

[0012] This invention incorporates a sealing and protective component. When the air sampling volume is about to reach the predetermined target volume, the PLC controller can control the operation of the electric push rod. This allows the telescopic end of the electric push rod to move the concave bracket and the sealing plug, causing the sealing plug to gradually approach the air inlet of the suction nozzle. After air sampling is completed, the control piston stops moving, and at the same time, the telescopic end of the electric push rod accelerates its retraction speed, allowing the sealing plug to quickly connect to the air inlet of the suction nozzle. This ensures timely sealing of the air storage cylinder, preventing errors in the air sampling volume and further ensuring the accuracy of the sampled air data and the authenticity of subsequent testing. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a three-dimensional structural schematic diagram from one perspective of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another perspective; Figure 3 This is a cross-sectional view of the structure of the gas storage cylinder and the fixed cylinder in this utility model; Reference numerals in the attached diagram: 1. Air reservoir; 2. Control piston; 3. Long lead screw; 4. Fixed cylinder; 5. Small motor; 6. Slider; 7. Guide rod; 8. Slide rail; 9. Pin; 10. Concave bracket; 11. Sealing plug; 12. Air extraction nozzle; 13. Electric push rod; 14. PLC controller; 15. Holding ring. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0016] The present invention will be further described below with reference to the embodiments.

[0017] Example: Refer to Figures 1 to 3 An automatic air sampling and detection device includes: an air storage cylinder 1 and an automatic sampling component. A fixed cylinder 4 is fixedly connected to the outer wall of the air storage cylinder 1 along its axial direction, and a gripping ring 15 is fixedly connected to the outer wall of the air storage cylinder 1 along its circumferential direction. Several anti-slip grooves are provided on the outer circumferential wall of the gripping ring 15. Specifically, the provision of several anti-slip grooves can increase the anti-slip grip performance of the grip ring 15, so as to facilitate handheld use of the air cylinder 1; The automatic sampling assembly includes a control piston 2 that is slidably connected to the inner wall of the gas storage cylinder 1, a long lead screw 3 that is rotatably connected to the outer wall of the gas storage cylinder 1, a small motor 5 that is fixedly installed on the inner wall of the fixed cylinder 4, the end of the long lead screw 3 away from the gas storage cylinder 1 that is fixedly connected to the output end of the small motor 5 through a coupling, a slider 6 that is threadedly fitted to the outer peripheral wall of the long lead screw 3, two guide rods 7 that are fixedly connected to the outer wall of the slider 6, the two guide rods 7 that pass through the axial side wall of the gas storage cylinder 1 and are fixedly connected to the control piston 2, two through holes that are opened in the axial side wall of the gas storage cylinder 1, the two guide rods 7 that slide in cooperation with the axial side wall of the gas storage cylinder 1 through the through holes, and silicone rubber sealing rings that are fixedly connected to both through holes; Specifically, the small motor 5 is a small brushless DC motor of model KBL2838 with a rated speed of 3000r / min. It achieves stepless speed regulation from 0 to 3000r / min through PLC controller 14, and the corresponding sampling rate range is 0.5-2L / min. The sampling amount of the gas storage tank 1 can be precisely controlled by setting the running time of the small motor 5: sampling amount = sampling rate × running time; Specifically, when the slider 6 moves the two guide rods 7, the two guide rods 7 can slide and engage with the axial side wall of the air storage cylinder 1 through the through hole to limit the movement of the slider 6, ensuring the linearity of the movement of the slider 6. In addition, the silicone rubber sealing ring at the through hole can fully seal the guide rods 7 and the through hole to prevent the sampling air from leaking. A small motor 5 drives the long lead screw 3 to rotate, causing the slider 6 on the long lead screw 3 to move the two guide rods 7. This allows the two guide rods 7 to drive the control piston 2 to slide in the air storage cylinder 1 and gradually move away from the air extraction nozzle 12. The pressure inside the air storage cylinder 1 gradually decreases, and the external air pressure pushes the air to be sampled into the air storage cylinder 1, thereby realizing automatic air sampling. This allows for more precise control of sampling time and sampling volume, ensuring the accuracy of air sampling data.

[0018] A sealing and protective assembly is fixedly connected to the outer wall of the gas storage cylinder 1. The sealing and protective assembly includes two slide rails 8 fixedly connected to the outer wall of the gas storage cylinder 1. Pins 9 are slidably connected to the inner side of each of the two slide rails 8. A concave bracket 10 is fixedly connected to the end of each of the two pins 9 outside the slide rails 8. A sealing plug 11 is fixedly connected to the inner side of the concave bracket 10. An air extraction nozzle 12 is fixedly connected to the axial side wall of the gas storage cylinder 1. The sealing plug 11 is selectively interference-fitted with the air extraction nozzle 12. The sealing plug 11 has a conical structure, and the air extraction nozzle 12 has a funnel-shaped structure. The maximum outer diameter of the sealing plug 11 is larger than the inner diameter of the air inlet of the air extraction nozzle 12. The sealing and protective assembly also includes an electric push rod 13 fixedly installed on the outer wall of the gas storage cylinder 1. The telescopic end of the electric push rod 13 is fixedly connected to the concave bracket 10. A PLC controller 14 is fixedly installed on the outer wall of the fixed cylinder 4. The PLC controller 14, the electric push rod 13, and the small motor 5 are electrically connected to an external power supply. Specifically, the electric actuator 13 is a small electric actuator of model DATIEE-IMD3 with a rated thrust of 50N. The extension and retraction speeds of the telescopic end can be switched by the PLC controller 14: low speed mode (5mm / s) in the later stage of sampling and high speed mode (20mm / s) in the sealing stage, ensuring that the sealing response time is ≤0.5s. Specifically, the PLC controller 14 adopts model S7-200SMART, with a built-in sampling control program. The sampling amount (0-5L) can be preset. When the sampling amount reaches the preset value, the small motor 5 is automatically triggered to stop and the electric push rod 13 is triggered to seal at high speed. The parameters can be modified through external buttons. Specifically, when the air sampling amount does not reach the predetermined target amount, the electric push rod 13 slowly drives the concave bracket 10 and the sealing plug 11 to move. At this time, the sealing plug 11 has a short distance from the air inlet of the suction nozzle 12, that is, the sealing plug 11 does not contact the suction nozzle 12, so as to avoid affecting the air sampling rate of the suction nozzle 12. Specifically, the maximum outer diameter of the sealing plug 11 is 0.5-1mm larger than the inner diameter of the air inlet of the suction nozzle 12, the interference is 0.5-1mm, and the inclination angle of the conical surface is 30° to ensure that the sealing surface is completely in contact when the interference fit is made. When the air sampling volume is about to reach the predetermined target volume, the PLC controller 14 can control the electric push rod 13 to operate, so that the extension end of the electric push rod 13 can drive the concave bracket 10 and the sealing plug 11 to move, so that the sealing plug 11 gradually approaches the air inlet of the suction nozzle 12. After the air sampling is completed, the PLC controller 14 controls the small motor 5 to stop running and accelerates the retraction speed of the extension end of the electric push rod 13, so that the sealing plug 11 can quickly connect to the air inlet of the suction nozzle 12, so as to seal the air storage cylinder 1 in time, avoid errors in the air sampling volume, and further ensure the accuracy of the sampled air data and the authenticity of subsequent tests.

[0019] The working principle of this utility model is as follows: In use, first push the control piston 2 close to the suction nozzle 12 to completely expel the original air in the air storage cylinder 1. Then place the device in the area to be sampled, start the small motor 5, and drive the long lead screw 3 to rotate. This causes the slider 6 on the long lead screw 3 to move the two guide rods 7. The two guide rods 7 can then drive the control piston 2 to slide in the air storage cylinder 1 and gradually move away from the suction nozzle 12. The pressure in the air storage cylinder 1 gradually decreases, and the external air pressure pushes the air to be sampled into the air storage cylinder 1 to achieve automatic air sampling. When the air sampling volume is about to reach the predetermined target volume, the PLC controller 14 can control the electric push rod 13 to operate, so that the extension end of the electric push rod 13 can drive the concave bracket 10 and the sealing plug 11 to move, so that the sealing plug 11 gradually approaches the air inlet of the suction nozzle 12. After the air sampling is completed, the PLC controller 14 controls the small motor 5 to stop running and accelerates the retraction speed of the extension end of the electric push rod 13, so that the sealing plug 11 can quickly connect to the air inlet of the suction nozzle 12, so as to seal the air storage cylinder 1 in time.

[0020] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. An automatic air sampling and detection device, characterized in that, include: Gas storage cylinder (1), with a fixed cylinder (4) fixedly connected to the outer wall of the gas storage cylinder (1) along its axial direction; An automatic sampling assembly includes a control piston (2) that is sealed and slidably connected to the inner wall of an air storage cylinder (1). A long lead screw (3) is rotatably connected to the outer wall of the air storage cylinder (1). A small motor (5) is fixedly installed on the inner wall of a fixed cylinder (4). The end of the long lead screw (3) away from the air storage cylinder (1) is fixedly connected to the output end of the small motor (5) through a coupling. A slider (6) is threadedly fitted to the outer peripheral wall of the long lead screw (3). Two guide rods (7) are fixedly connected to the outer wall of the slider (6). The two guide rods (7) penetrate the axial side wall of the air storage cylinder (1) and are fixedly connected to the control piston (2). The gas storage cylinder (1) is fixedly connected to a sealing and protective component on its circumferential outer wall.

2. The automatic air sampling and detection device according to claim 1, characterized in that, The sealing and protective assembly includes two slide rails (8) fixedly connected to the outer circumferential wall of the gas storage cylinder (1). Pins (9) are slidably connected to the inner side of each of the two slide rails (8). A concave bracket (10) is fixedly connected to the end of each of the two pins (9) located outside the slide rails (8). A sealing plug (11) is fixedly connected to the inner side of the concave bracket (10). An air extraction nozzle (12) is fixedly connected to the axial side wall of the gas storage cylinder (1). The sealing plug (11) is selectively interference-fitted with the air extraction nozzle (12).

3. The automatic air sampling and detection device according to claim 2, characterized in that, The sealing and protection assembly also includes an electric push rod (13) fixedly installed on the outer circumferential wall of the gas storage cylinder (1). The telescopic end of the electric push rod (13) is fixedly connected to the concave bracket (10). A PLC controller (14) is fixedly installed on the outer wall of the fixed cylinder (4). The PLC controller (14), the electric push rod (13), the small motor (5) are electrically connected to an external power supply.

4. The automatic air sampling and detection device according to claim 1, characterized in that, The gas storage cylinder (1) has two through holes on its axial sidewall. The two guide rods (7) slide in contact with the axial sidewall of the gas storage cylinder (1) through the through holes, and silicone rubber sealing rings are fixedly connected to both through holes.

5. An automatic air sampling and detection device according to claim 2, characterized in that, The sealing plug (11) is cone-shaped, the suction nozzle (12) is funnel-shaped, and the maximum outer diameter of the sealing plug (11) is greater than the inner diameter of the air inlet of the suction nozzle (12).

6. The automatic air sampling and detection device according to claim 1, characterized in that, The gas storage cylinder (1) is fixedly connected to a gripping ring (15) on its outer circumferential wall, and the outer circumferential wall of the gripping ring (15) is provided with several anti-slip grooves.

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