Automatic film changing device

Abstract

The utility model discloses an automatic film changing device, which relates to the technical field of automation and comprises a film storage unit and a transmission channel. The membrane storage unit comprises a plurality of membrane boxes which are arranged along the circumferential direction, and the plurality of membrane boxes rotate along the circumferential direction; a filtering membrane is placed in the membrane box; openings are formed in the upper and lower parts of the diaphragm capsule for realizing gas transmission; the transmission channel comprises an upper-layer channel, a lower-layer channel and a mechanical arm; the mechanical arm is used for controlling movement of the upper-layer channel and the lower-layer channel; the upper-layer channel and the lower-layer channel are used for clamping a diaphragm capsule, so that a sealed transmission channel is formed; and a filtering membrane in the membrane box realizes a filtering effect in the sealed transmission channel. The membrane storage unit is provided with the membrane boxes which are arranged circumferentially, a plurality of filtering membranes can be stored, the old membrane can be automatically moved away, the new membrane can be accurately rotated to a target position by rotating the membrane storage unit, manual intervention is not needed, the membrane replacement efficiency is greatly improved, and the membrane replacement device is suitable for long-term continuous sampling scenes.

Description

Technical Field

[0001] This utility model relates to the field of automation technology, and in particular to an automatic film changing device. Background Technology

[0002] In the field of atmospheric monitoring, filter membranes, as the core protective component of gas detection systems, bear a dual mission: on the one hand, they protect downstream precision analytical instruments by intercepting particulate matter; on the other hand, they provide particulate matter sample carriers for offline analytical devices. Due to the limited lifespan of the membranes, the system needs to periodically replace them to maintain measurement accuracy and data continuity. Automated replacement of filter membranes is crucial for ensuring the cleanliness of the sampling system, the accuracy of parameter measurements, and the long-term stable operation of the equipment. Traditional sampling equipment largely relies on manual replacement of filter membranes, requiring frequent start-ups and shutdowns, removal of filter membrane clamps, and manual installation of new membranes. This method has the following significant drawbacks:

[0003] 1. Low efficiency: Manual membrane replacement takes about 5-10 minutes per instance, which is difficult to meet the needs of high-frequency sampling (such as the need for hourly replacement for super-station grid monitoring);

[0004] 2. Reliability risk: Manual membrane replacement may introduce external contamination or membrane damage, leading to sample loss or error (studies show that the error rate of manual operation can reach 3%-8%).

[0005] 3. Limitations in high-risk scenarios: High-temperature, highly corrosive, or radioactive environments (such as flue gas monitoring in waste incineration plants pose personal safety hazards), making manual membrane replacement impossible; Utility Model Content

[0006] In order to overcome the defects in the prior art, this utility model provides an automatic membrane replacement device, which aims to solve the problems of low efficiency, high operational risk and insufficient reliability caused by existing gas sampling equipment relying on manual or low-reliability automated solutions to replace filter membranes.

[0007] To achieve the above objectives, the present invention adopts the following technical solution, including:

[0008] An automatic membrane changing device includes: a membrane storage unit and a transmission channel;

[0009] The membrane storage unit includes several membrane boxes arranged in a circumferential direction, which rotate in the circumferential direction; a filter membrane is placed in each membrane box; and each membrane box has openings at the top and bottom for gas transmission.

[0010] The transmission channel includes an upper channel, a lower channel, and a robotic arm; the robotic arm is used to control the movement of the upper and lower channels; the upper and lower channels are used to clamp the membrane cartridge, thereby forming a sealed transmission channel; the filter membrane in the membrane cartridge performs filtration in the sealed transmission channel.

[0011] Preferably, the membrane storage unit includes: a wheel, a membrane box, a cover plate, a positioning plate, and a drive mechanism;

[0012] The wheel is located above the positioning disk and the two are coaxially and fixedly connected; the wheel has a plurality of first through holes along the circumferential direction; the positioning disk has a plurality of grooves along the circumferential direction corresponding to the first through holes; the cavity formed by the first through holes and the corresponding grooves constitutes the membrane box; a second through hole coaxially aligned with the first through hole is opened in the groove; the first through hole and the second through hole constitute the upper and lower openings of the membrane box.

[0013] The cover plate is located above the wheel and is used to seal the upper opening of the diaphragm box; the cover plate has an opening.

[0014] The lower surface of the positioning disc, located below the groove, i.e. the bottom of the membrane box, is provided with a puncturable sealing membrane for sealing the lower opening of the membrane box; a corresponding needle for puncturing the sealing membrane is provided in the lower channel.

[0015] The driving mechanism is used to drive the positioning disk and the wheel to rotate synchronously, thereby realizing the rotation of the membrane box while the cover plate does not rotate.

[0016] Preferably, the wall of the first through hole extends downward toward the wheel to form a convex ring, and the convex rings below each first through hole are correspondingly engaged in each groove, thereby achieving a fixed engagement between the positioning plate and the wheel.

[0017] Preferably, magnets are evenly distributed in the groove of the positioning disk along the circumferential direction of the second through hole, and the magnets are used for magnetic positioning with the lower channel.

[0018] Preferably, the drive mechanism includes a stepper motor and a harmonic reducer.

[0019] Preferably, each membrane box is equipped with an RFID chip to store relevant information about the filter membrane, including the filter membrane material, initial resistance, and expiration date.

[0020] Preferably, each membrane box is also equipped with a temperature control unit for controlling the temperature inside the membrane box.

[0021] Preferably, the upper channel is conical with the constricted end facing upward and the flared end facing downward; the lower channel is conical with the flared end facing upward and the constricted end facing downward; the constricted end of the upper channel serves as the air inlet; the constricted end of the lower channel serves as the air outlet and is connected to the sampling chamber of the sampling device.

[0022] Preferably, pressure sensors are provided in the upper and lower channels to monitor the pressure in the channels in real time; flow sensors and solenoid valves are provided in both the inlet and outlet ends to monitor and control the gas flow rate in real time.

[0023] The advantages of this utility model are:

[0024] (1) The membrane storage unit is equipped with membrane boxes arranged in a circle, which can store multiple filter membranes. By rotating the membrane storage unit, the old membrane can be automatically moved away and the new membrane can be accurately rotated to the target position without manual intervention, which greatly improves the membrane replacement efficiency and is suitable for long-term continuous sampling scenarios.

[0025] (2) The top and bottom openings of the membrane box are sealed by a cover plate and a sealing membrane to ensure the storage environment of the filter membrane in the membrane box.

[0026] (3) During the membrane replacement process, the upper and lower channels are sealed by mechanical clamping and needles to avoid manual contact with the filter membrane and prevent membrane material contamination or damage. It is especially suitable for sterile and high-cleanliness environments.

[0027] (4) The conical design of the upper channel (constriction facing upward) and the lower channel (constriction facing downward) can guide the gas to pass through the filter membrane evenly, reduce flow resistance, and, together with the pressure sensor and solenoid valve, adjust the flow rate in real time to ensure the pressure of the sampling chamber is stable and meet the requirements of high-precision sampling.

[0028] (5) Each membrane box is equipped with an RFID chip to store filter membrane information (material, initial resistance, expiration date). Combined with the temperature control unit, it realizes digital management of membrane material information and optimization of environmental adaptability, avoiding performance degradation caused by membrane aging or abnormal ambient temperature.

[0029] (6) The membrane box, transmission channel, and storage unit are independent, which facilitates later maintenance and replacement; the robotic arm drives the transmission channel to move, which can flexibly adapt to membrane boxes or sampling equipment of different sizes, improving the versatility of the device.

[0030] (7) The pressure sensor monitors the pressure in the channel in real time to avoid gas leakage caused by seal failure or membrane damage; the solenoid valve and flow sensor control the air intake flow to prevent overpressure damage to the sampling equipment and improve system safety. Attached Figure Description

[0031] Figure 1This is a front view of an automatic film changing device according to the present invention.

[0032] Figure 2 This is a cross-sectional view of an automatic film changing device according to the present invention.

[0033] Figure 3 This is a top view of an automatic film changing device according to the present invention.

[0034] Figure 4 This is a perspective view of an automatic film changing device according to the present invention.

[0035] Figure 5 This is a three-dimensional sectional view of an automatic film changing device according to the present invention.

[0036] Figure 6 This is a schematic diagram of the structure of an automatic film changing device according to the present invention.

[0037] Figure 7 This is a schematic diagram of the positioning disc of this utility model.

[0038] Figure 8 This is a schematic diagram of the bottom surface of the positioning plate of this utility model.

[0039] Figure 9 This is a schematic diagram of the structure of the wheel of this utility model.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1-Wheel, 2-Diaphragm, 3-Cover plate, 4-Positioning plate, 5-Drive mechanism, 101-First through hole, 102-Protruding ring, 401-Groove, 402-Second through hole, 403-Third through hole, 201-Heating resistance wire, 202-Sealing membrane, 203-Sealing ring, 301-Opening, 6-Upper channel, 7-Lower channel, 8-Robotic arm, 601-Air inlet, 701-Air outlet, 702-Needle, 9-Permanent magnet, 10-Hall sensor. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] This invention systematically solves the key deficiencies of existing membrane replacement devices in terms of efficiency, reliability, compatibility, and intelligence by integrating stepper motor wheel operation, dynamic sealing control, and intelligent sensing system. In particular, it provides an innovative solution for high-frequency sampling of fragile nanofiber membranes and unmanned monitoring in high-risk environments, promoting the upgrading of environmental monitoring equipment towards high precision, full automation, and Internet of Things.

[0044] Depend on Figure 1-9 As shown, the present invention provides an automatic membrane changing device that adopts an integrated design of rotating membrane storage and vertical membrane changing, specifically including: a membrane storage unit and a transmission channel.

[0045] The membrane storage unit includes a wheel 1, a membrane box 2, a cover plate 3, a positioning plate 4, and a drive mechanism 5.

[0046] The wheel 1 has a plurality of first through holes 101 evenly distributed along its circumference. In this embodiment, the wheel 1 is a titanium alloy disc with a diameter of 300 mm, and the wheel 1 has 8 first through holes 101 with a diameter of 35 mm.

[0047] The wall of each first through hole 101 extends downward toward the lower surface of the wheel 1 to form a convex ring 102.

[0048] The positioning disk 4 is located below the wheel disk 1. The positioning disk 4 has several grooves 401 evenly distributed along the circumference, corresponding to the convex rings 102. Each convex ring 102 on the lower surface of the wheel disk 1 is engaged in the corresponding groove 401, thereby achieving a fixed engagement between the positioning disk 4 and the wheel disk 1. The inner diameter of the groove 401 is slightly larger than the outer diameter of the convex ring 102.

[0049] The positioning disk 4 has a groove 401 with a second through hole 402 coaxially aligned with the first through hole 101, and the diameter of the second through hole 402 is smaller than the diameter of the first through hole 101. Magnets are also evenly distributed along the circumference of the second through hole 402 in the groove 401 of the positioning disk 4, and these magnets are used for magnetic positioning. In this embodiment, several third through holes 403 are evenly distributed along the circumference of the second through hole 402 in the groove 401 of the positioning disk 4, and magnets are placed in the third through holes 403. In this embodiment, the axial positioning accuracy can reach ±0.02mm.

[0050] The cavity formed by the first through hole 101 and the groove 401 serves as the membrane box 2, which is used to place the filter membrane (membrane sheet).

[0051] Each membrane cartridge 2 is equipped with an RFID chip to store information such as the filter membrane's material, initial resistance, and expiration date. Initial resistance refers to the air pressure (resistance) required for a set flow rate of gas to initially pass through a clean filter membrane. Once the filter membrane becomes contaminated, the air pressure required for the set flow rate of gas to pass through the contaminated filter membrane increases. The pressure increase can be used to determine whether the filter membrane needs to be replaced. In this embodiment, the RFID chip for each membrane cartridge 2 is located on the upper surface of the wheel 1, close to the membrane cartridge 2.

[0052] Each membrane box 2 is equipped with a temperature control unit to control the temperature inside the membrane box 2. In this embodiment, a heating resistance wire 201 is provided on the inner wall of the membrane box 2 (i.e., the inner wall of the first through hole 101) to ensure that the membrane box 2 reaches the specified temperature, so as to prevent the temperature from being too low and causing the filter membrane inside to become brittle.

[0053] The bottom of the film box 2 is sealed with a puncturable sealing film 202 (e.g., PET / Al composite layer). Specifically, the sealing film 202 is set on the lower surface of the positioning plate 4 and located below the groove 401.

[0054] The cover plate 3 is located above the wheel 1. An opening 301 is provided on the cover plate 3. The size of the opening 301 is larger than the size of the diaphragm box 2, so that the diaphragm box 2 can be opened through the opening 301.

[0055] The drive mechanism 5 includes a stepper motor and a harmonic reducer. The stepper motor and harmonic reducer drive the positioning disk 4 to rotate, which in turn drives the wheel 1 to rotate synchronously, thus achieving the rotation of the membrane box 2. The angular resolution is 0.1°, it supports bidirectional indexing, and can achieve a membrane switching speed of up to 0.5 seconds per piece. During membrane replacement, the drive mechanism 5 drives the membrane box 2 to rotate while the cover plate 3 remains stationary, ensuring that any membrane box 2 aligns with the opening 301 on the cover plate 3.

[0056] The transmission channels include an upper channel 6 and a lower channel 7, located above and below the membrane storage unit, respectively. The upper channel 6 is conical with its constricted end facing upwards and its flared end facing downwards; the lower channel 7 is also conical with its flared end facing upwards and its constricted end facing downwards. The constricted end of the upper channel 6 serves as the air inlet 601; the constricted end of the lower channel 7 serves as the air outlet 701, connected to the sampling chamber of the sampling device. The upper channel 6 and lower channel 7 move vertically via a robotic arm 8; in this embodiment, the upper channel 6 and lower channel 7 move synchronously up and down. During membrane replacement, the robotic arm 8 controls the upper channel 6 to move downwards. The tapered flared end of the upper channel 6 passes through the opening 301 of the cover plate 3 and abuts against the upper surface of the wheel 1, aligning with the membrane box 2 (aligning with the first through hole 101 of the wheel 1). Simultaneously, the robotic arm 8 controls the lower channel 7 to move upwards. The tapered flared end of the lower channel 7 abuts against the lower surface of the positioning plate 4 and aligns with the membrane box 2 (aligning with the groove 401 of the positioning plate 4). In this embodiment, the diameter of the tapered flared ends of both the upper channel 6 and the lower channel 7 is 40mm.

[0057] In this embodiment, the upper end face of the membrane box 2 is provided with an O-ring silicone seal 203 (temperature resistant -40℃~250℃), that is, the upper surface of the wheel 1 is provided with an O-ring silicone seal 203 at the outer edge of the first through hole 101, which is used to ensure the sealing between the upper channel 6 and the membrane box 2, and the leakage rate is <0.1mL / min when closed.

[0058] In this embodiment, when the lower channel 7 moves upward, the magnet in the groove 401 of the positioning disk 4 has a magnetic attraction with the end face of the tapered flared end of the lower channel 7, which helps to position the membrane box 2 between the upper channel 6 and the lower channel 7.

[0059] The tapered inner wall of the lower channel 7 is provided with vertically upward (perpendicular to the lower surface of the wheel) needles 702. When the membrane is replaced, that is, when the lower channel 7 moves upward, the needles 702 are used to puncture the sealing membrane 202 located on the lower surface of the positioning disk 4, and the needles 702 will not puncture the membrane box 2 and will not puncture the filter membrane.

[0060] In this embodiment, a solenoid valve and a flow sensor are installed at the air inlet 601 of the upper channel 6, and a solenoid valve and a flow sensor are installed at the air outlet 701 of the lower channel 7. The solenoid valve can precisely adjust the valve opening, thereby accurately controlling the gas flow rate.

[0061] In this embodiment, pressure sensors are respectively installed in the upper channel 6 and the lower channel 7. Specifically, micro pressure sensors with a range of ±5kPa are used to monitor the pressure in the upper channel 6 and the lower channel 7 in real time. The pressure in the lower channel 7 is the sampling chamber pressure of the sampling device. The sampling chamber is located downstream of the lower channel 7 and is connected to the air outlet 701 of the lower channel 7.

[0062] In this embodiment, the negative pressure generator (vacuum degree -80kPa) of the sampling device is located downstream of the lower channel 7. After the negative pressure generator is started, the filter membrane in the membrane box 2 is adsorbed towards the lower channel 7 and adheres to the upper surface of the groove 401.

[0063] The automatic film changing device of this utility model is also equipped with a positioning unit and an intelligent control module.

[0064] The positioning unit uses a Hall sensor 10 to locate the position of the membrane box 2 in order to determine whether the new membrane box 2 has been rotated to the target position.

[0065] The Hall sensor 10 operates based on the Hall effect. When a magnetic field approaches the Hall sensor, it generates a voltage signal proportional to the magnetic field strength. It is typically used in conjunction with a permanent magnet. When the permanent magnet moves with the object (diaphragm 2) to the vicinity of the Hall sensor, the Hall sensor can detect the change in the magnetic field and output a corresponding signal. In this embodiment, the Hall sensor 10 is fixedly mounted on the base of the robotic arm 8. Several permanent magnets 9, corresponding one-to-one with the diaphragm 2, are arranged on the edge of the wheel 1. When the diaphragm 2 reaches the target position, the distance between the permanent magnet 9 corresponding to the diaphragm 2 and the Hall sensor 10 is closest. The Hall sensor 10 detects the signal of the change in the magnetic field to accurately determine whether the diaphragm 2 has reached the target position.

[0066] The intelligent control module is communicatively connected to the membrane storage unit, the transmission channel, and the positioning unit. It is used to receive positioning signals from the positioning unit, send control signals to the membrane storage unit and the transmission channel, and control the rotation of the membrane box 2 and the movement of the upper channel 6 and the lower channel 7.

[0067] During membrane replacement, the intelligent control module controls the membrane storage unit to rotate, and at the same time, according to the positioning signal from the positioning unit, rotates the new membrane box 2 to the target position; the intelligent control module controls the upper channel 6 and the lower channel 7 to move above and below the new membrane box 2 respectively, clamping the new membrane box 2, thereby forming a sealed transmission channel; the target position refers to the position where the sealed transmission channel transmits gas.

[0068] The membrane changing method of the automatic membrane changing device of this utility model is as follows:

[0069] S1, start the membrane replacement procedure. The intelligent control module controls the first solenoid valve at the air inlet 601 and the second solenoid valve at the air outlet 701 to close. At the same time, the robotic arm 8 controls the upper channel 6 to move upward and the lower channel 7 to move downward, thereby releasing the old membrane box 2 in the membrane storage unit.

[0070] S2, the intelligent control module controls the drive mechanism 5 of the membrane storage unit to drive the wheel 1 and the positioning disk 4 to rotate synchronously, so as to rotate the new membrane box 2 to the target position; during this process, the intelligent control module can receive the detection signal of the Hall sensor 10 in real time, thereby determining whether the new membrane box 2 has reached the target position.

[0071] The target position refers to the position where the gas is transported in the sealed transmission channel, and the new membrane box 2 is coaxially aligned with the upper channel 6 and the lower channel 7.

[0072] After the new membrane cartridge 2 rotates to the target position, the intelligent control module also performs radio frequency identification on the RFID chip of the new membrane cartridge 2 to obtain information such as the material, initial resistance, and expiration date of the filter membrane in the new membrane cartridge 2. Specific target data can be identified and read / written via radio signals, completing the identification and data reading / writing process without mechanical contact or specific complex environments.

[0073] S3, after the new membrane box 2 reaches the target position, the intelligent control module controls the upper channel 6 to move downward and the lower channel 7 to move upward through the robotic arm 8, thereby clamping and sealing the membrane storage unit. At the same time, the needles 702 on the conical inner wall of the lower channel 7 pierce the sealing membrane at the bottom of the membrane box 2, ultimately forming a sealed transmission channel.

[0074] S4, the intelligent control module controls the opening of the first solenoid valve at the air inlet 601 and the second solenoid valve at the air outlet 701; after the negative pressure generator of the sampling device works, the filter membrane in the membrane box 2 is adsorbed and adheres to the upper surface of the groove 401 in the direction of the lower channel 7. The sampling gas is input through the air inlet 601, passes through the filter membrane in the transmission channel, and is output from the air outlet 701 to the sampling chamber.

[0075] S5, the intelligent control module receives the pressure monitored by the pressure sensor in real time, and dynamically adjusts the first solenoid valve at the air inlet 601 through the PID algorithm, thereby dynamically adjusting the air intake flow and keeping the sampling chamber pressure under the required pressure conditions.

[0076] S6, the intelligent control module judges the usage status of the filter membrane in real time and determines whether a new filter membrane needs to be replaced. If so, it jumps to step S1 and starts the membrane replacement program; if not, it jumps to step S5 and continues to monitor and dynamically adjust in real time.

[0077] The specific method for determining whether a new filter membrane needs to be replaced is as follows:

[0078] Based on the real-time monitoring of the pressure in the upper channel 6 and the lower channel 7, the pressure difference across the filter membrane is calculated to determine whether the pressure difference is greater than α times the initial resistance. If so, it indicates that the filter membrane is severely clogged and needs to be replaced with a new filter membrane; otherwise, it does not need to be replaced with a new filter membrane; where α > 1.

[0079] Alternatively, depending on the usage time of the filter membrane, if the usage time of the filter membrane exceeds the set time, a new filter membrane needs to be replaced; otherwise, a new filter membrane does not need to be replaced.

[0080] Alternatively, based on the real-time airflow monitored by the flow sensor at the air outlet 701, if the airflow in the lower channel 7 is still less than the set flow rate after adjusting the airflow in the upper channel 6, then a new filter membrane needs to be replaced; otherwise, a new filter membrane does not need to be replaced.

[0081] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic film changing device, characterized in that, include: The membrane storage unit and transmission channel; The membrane storage unit includes several membrane boxes (2) arranged in a circumferential direction, which rotate in a circumferential direction; a filter membrane is placed in the membrane box (2); the membrane box (2) has openings at the top and bottom for gas transmission; The transmission channel includes an upper channel (6), a lower channel (7), and a robotic arm (8); the robotic arm (8) is used to control the movement of the upper channel (6) and the lower channel (7); the upper channel (6) and the lower channel (7) are used to clamp the membrane box (2) to form a sealed transmission channel; the filter membrane in the membrane box (2) performs filtration in the sealed transmission channel.

2. The automatic film changing device according to claim 1, characterized in that, The membrane storage unit includes: a wheel (1), a membrane box (2), a cover plate (3), a positioning plate (4), and a drive mechanism (5); The wheel (1) is located above the positioning plate (4) and the two are coaxially fixedly connected; the wheel (1) has a plurality of first through holes (101) along the circumferential direction; the positioning plate (4) has a plurality of grooves (401) corresponding to the first through holes (101) along the circumferential direction; the cavity formed by the first through holes (101) and the corresponding grooves (401) constitutes the diaphragm box (2); the grooves (401) have second through holes (402) coaxially aligned with the first through holes (101); the first through holes (101) and the second through holes (402) constitute the upper and lower openings of the diaphragm box (2); The cover plate (3) is located above the wheel (1) and is used to seal the upper opening of the diaphragm box (2); an opening (301) is provided on the cover plate (3). The lower surface of the positioning disk (4) and below the groove (401), i.e. the bottom of the membrane box (2), is provided with a puncturable sealing membrane (202) for sealing the lower opening of the membrane box (2); the lower channel (7) is provided with a corresponding needle (702) for puncturing the sealing membrane (202). The drive mechanism (5) is used to drive the positioning disk (4) and the wheel disk (1) to rotate synchronously, thereby realizing the rotation of the diaphragm box (2) and the cover plate (3) does not rotate.

3. The automatic film changing device according to claim 2, characterized in that, The wall of the first through hole (101) extends downward toward the wheel (1) to form a convex ring (102). The convex rings (102) below each first through hole (101) are correspondingly engaged in each groove (401), thereby realizing the fixed engagement of the positioning disk (4) and the wheel (1).

4. An automatic film changing device according to claim 2, characterized in that, Magnets are also evenly distributed in the groove (401) of the positioning disk (4) along the circumferential direction of the second through hole (402), and the magnets are used for magnetic positioning with the lower channel (7).

5. An automatic film changing device according to claim 2, characterized in that, The drive mechanism (5) includes a stepper motor and a harmonic reducer.

6. An automatic film changing device according to claim 1, characterized in that, Each membrane box (2) is equipped with an RFID chip to store relevant information about the filter membrane, including the material, initial resistance and expiration date of the filter membrane.

7. An automatic film changing device according to claim 1, characterized in that, Each membrane box (2) is also equipped with a temperature control unit for controlling the temperature in the membrane box (2).

8. An automatic film changing device according to claim 1, characterized in that, The upper channel (6) is conical with the conical constricted end facing upward and the conical flared end facing downward; the lower channel (7) is conical with the conical flared end facing upward and the conical constricted end facing downward; the conical constricted end of the upper channel (6) serves as the air inlet (601); the conical constricted end of the lower channel (7) serves as the air outlet (701) and is connected to the sampling chamber of the sampling device.

9. An automatic film changing device according to claim 8, characterized in that, Pressure sensors are provided in the upper channel (6) and lower channel (7) for real-time monitoring of the pressure in the channel; flow sensors and solenoid valves are provided in the inlet end (601) and outlet end (701) for real-time monitoring and control of gas flow.

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