Conveyor belt type automatic film changing and sampling system

Abstract

The invention relates to environment monitoring equipment, in particular to a conveyor belt type automatic membrane changing and sampling system which comprises a support, a new membrane winding drum, an air inlet unit, an old membrane winding drum, a driving assembly and a filter membrane belt, the new membrane winding drum and the old membrane winding drum are suitable for rotating relative to the support, and the air inlet unit comprises an upper membrane cover, a lower membrane column and a lower membrane column pushing assembly. During sample injection, the lower membrane column pushing assembly drives the lower membrane column to move upwards or downwards, the driving assembly is suitable for driving the old membrane winding drum to rotate, one end of the filter membrane belt is wound on the new membrane winding drum, the other end of the filter membrane belt is wound on the old membrane winding drum, and during sample injection, the lower membrane column pushing assembly drives the lower membrane column to move upwards; the filter membrane belt is clamped between the lower membrane column and the upper membrane cover, when the membrane is replaced, the lower membrane column is separated from the upper membrane cover, and the driving assembly drives the old membrane winding drum to rotate. The conveyor belt type automatic film changing sampling system is high in sampling efficiency, simple in structure, small in size and low in cost.

Description

Technical Field

[0001] The present invention relates to an environmental monitoring device, in particular to a conveyor belt type automatic membrane changing sampling system. Background Art

[0002] During the process of introducing air into the monitoring device through a sampling tube by the environmental monitoring device, it is necessary to block large particles such as dust in the air through a filter membrane to prevent the large particles from entering the monitoring device and damaging the monitoring device. When the filter membrane is used for a certain period of time, the filter membrane will be blocked due to the accumulation of dust, so the filter membrane needs to be replaced regularly.

[0003] In the existing sampling devices, most of them first transport the membrane tow to a designated position, and then transport the membrane tow at the designated position to the air inlet and outlet position through a conveying device. After that, the air intake work starts. After the air intake work is completed, the used membrane tow is transported back to a large sliding table through a conveying device (conveyor belt or sliding table). After being transported back, the large sliding table is lifted upward by one position for the next sampling operation. The existing sampling devices are not only bulky and have complex mechanisms, but also can only operate one filter membrane at a time, resulting in low efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a conveyor belt type automatic membrane changing sampling system with high sampling efficiency, simple structure, small volume and low cost.

[0005] To achieve the above purpose, a conveyor belt type automatic membrane changing sampling system of the present invention includes a bracket, a new membrane reel connected to the bracket, at least one air intake unit, an old membrane reel, a driving component, and a filter membrane belt. The new membrane reel, the air intake unit, and the old membrane reel are arranged in sequence from upstream to downstream.

[0006] The new membrane reel is adapted to rotate relative to the bracket.

[0007] The air intake unit includes an upper membrane cover, a lower membrane column, and a lower membrane column pushing component. An air intake port is provided on the upper membrane cover, and an air outlet is provided on the lower membrane column. The upper membrane cover is adapted to cover or leave the lower membrane column. The lower membrane column is located below the upper membrane cover and is vertically arranged. The filter membrane belt is clamped between the lower membrane column and the upper membrane cover. The lower membrane column pushing component is connected to the lower membrane column, and the lower membrane column pushing component drives the lower membrane column to move upward or downward.

[0008] The old membrane reel is rotatably connected to the bracket, and the driving component is connected to the old membrane reel. The driving component is adapted to drive the old membrane reel to rotate.

[0009] One end of the filter membrane belt is wound around the new membrane reel and the other end is wound around the old membrane reel.

[0010] During sample injection, the lower membrane column pushing assembly of each intake unit drives the lower membrane column to move upward. The upper membrane cover covers the lower membrane column, clamping the filter membrane belt between the lower membrane column and the upper membrane cover. When changing the membrane, the upper membrane cover of each intake unit opens, the lower membrane column pushing assembly drives the lower membrane column to move downward, the lower membrane column separates from the upper membrane cover, the driving assembly drives the old membrane reel to rotate, drives the filter membrane belt to move, and the filter membrane clamped between the lower membrane column and the upper membrane cover moves downstream and winds around the old membrane reel. The filter membrane wound around the new membrane reel enters between the lower membrane column and the upper membrane cover.

[0011] Further, it further includes a first roller and a second roller. The first roller and the second roller are both rotatably connected to the bracket. The first roller is arranged between the new membrane reel and the intake unit at the most upstream. The second roller is arranged between the intake unit at the most downstream and the old membrane reel. The filter membrane belt bypasses the first roller and the second roller.

[0012] Further, the new membrane reel and the old membrane reel have the same structure. Among them, the new membrane reel includes a reel, a reel pressing piece, a damping ring, a film winding cylinder, and a fixing nut. The filter membrane belt is wound around the outside of the film winding cylinder. The reel is rotatably connected to the bracket. The reel pressing piece is sleeved on the reel. The damping ring is sleeved outside the reel, and the damping ring is squeezed between the reel pressing piece and the reel. The film winding cylinder is sleeved outside the damping ring. The fixing nut is sleeved outside the reel, and the fixing nut is located outside the reel pressing piece. The fixing nut is used to lock the reel pressing piece.

[0013] Further, the outer wall of the reel is provided with a first boss, a second boss, and a third boss. The outer wall of the reel pressing piece is provided with a fourth boss, a fifth boss, and a sixth boss. The sixth boss is conical. The damping ring is sleeved on the third boss and the sixth boss. Both ends of the damping ring are clamped between the second boss and the fifth boss. The film winding cylinder is sleeved outside the second boss and the fifth boss. Both ends of the film winding cylinder are clamped between the first boss and the fourth boss.

[0014] Further, the old membrane reel further includes a rotation stopping nail. The rotation stopping nail is an elongated rod member connected to the old membrane reel. The rotation stopping nail extends along the axial direction of the old membrane reel. A gap is left between the rotation stopping nail and the outer wall of the old membrane reel. One end of the filter membrane belt wound around the old membrane reel first winds around the rotation stopping nail at least one turn.

[0015] Further, the first drum and the second drum have the same structure. Among them, third baffles and fourth baffles are arranged on the surface of the second drum. The third baffle and the fourth baffle are respectively located at both ends of the second drum along the length direction. The third baffle and the fourth baffle protrude radially from the surface of the second drum. It further includes a photoelectric sensor and a control unit. The photoelectric sensor is connected to the control unit, and the control unit is connected to the drive assembly. The photoelectric sensor is arranged close to the third baffle of the second drum. The third baffle completely blocks the photosensitive element of the photoelectric sensor. A notch is arranged on the third baffle. When the notch corresponds to the photoelectric sensor, the blocking signal disappears. The photoelectric sensor sends a signal to the control unit. The control unit determines the number of turns of the second drum according to the number of times the signal disappears, and controls the drive assembly to start or stop according to the number of turns.

[0016] Further, the drive assembly includes a motor, a driving pulley, a tensioning pulley, a driven pulley, and a timing belt. The driving pulley is connected to the output shaft of the motor. The driven pulley is connected to the old film reel to drive the old film reel to rotate synchronously. The tensioning pulley is connected to the bracket. The timing belt is wound around the driving pulley, the tensioning pulley, and the driven pulley.

[0017] Further, the air inlet unit further includes a film cover connecting plate. The upper film cover is connected to the film cover connecting plate. One end of the film cover connecting plate is hinged to the bracket. The film cover connecting plate is adapted to drive the upper film cover to rotate.

[0018] Further, the lower film column pushing assembly includes a push rod, a fork, and a fork mounting block. The fork mounting block is located on one side of the lower film column and is connected to the bracket. A through hole is arranged at the bottom of the lower film column. The through hole is arranged radially along the lower film column. The push rod is vertically arranged. One end of the fork is hinged to the top of the push rod and the other end extends into the through hole. The middle of the fork is rotatably connected to the fork mounting block. When the push rod moves upward, the fork drives the lower film column to move downward. When the push rod moves downward, the fork drives the lower film column to move upward.

[0019] Further, the air inlet unit further includes a pressure spring and a lower film guide cylinder. The outer wall of the lower film column is stepped. Part of the lower film column is arranged in the lower film guide cylinder. The bottom of the lower film column passes through the lower film guide cylinder and extends outside the lower film guide cylinder. The lower film column is adapted to move up and down relative to the lower film guide cylinder. The pressure spring is sleeved on the small-diameter part of the lower film column. The upper end of the pressure spring abuts against the outer wall boss of the lower film column, and the lower end abuts against the bottom of the lower film guide cylinder.

[0020] The conveyor - belt type automatic membrane - changing sampling system of the present invention has at least the following beneficial effects:

[0021] A conveyor - belt type automatic membrane - changing sampling system of the present invention includes a new membrane reel, an air inlet unit, an old membrane reel, a driving assembly, and a filter membrane belt. One end of the filter membrane belt is wound around the new membrane reel and the other end is wound around the old membrane reel. By driving the old membrane reel to rotate through the driving assembly, the filter membrane belt moves in the form of a conveyor belt to complete the filter membrane replacement. Compared with other circular filter membranes, the mechanical structure of the sampling system of the present invention is simpler. Only one driving assembly can drive the whole device to perform the membrane - changing operation, reducing the probability of mechanical failures caused by mechanical movement. At the same time, the volume of the device is also reduced, and it does not require a dedicated space. It only needs to be placed beside the backend device and connect the air outlet of the sampling tube and the air inlet of the device to achieve sample injection. Moreover, compared with the single - piece filter membranes of other devices, the filter membrane belt in the system of the present invention has a longer service life, reducing the number of maintenance operations of maintenance personnel and effectively reducing the maintenance cost. Furthermore, since the filter membrane belt moves in the form of a conveyor belt, multiple air inlet units can be set, improving the sampling efficiency.

[0022] The following specifically describes the conveyor - belt type automatic membrane - changing sampling system of the present invention with reference to the accompanying drawings. Description of the Drawings

[0023] Figure 1 is the overall structural schematic diagram of the conveyor - belt type automatic membrane - changing sampling system of the present invention;

[0024] Figure 2 is the overall structural schematic diagram of the conveyor - belt type automatic membrane - changing sampling system of the present invention in another direction;

[0025] Figure 3 is the sectional view of the air inlet unit in the conveyor - belt type automatic membrane - changing sampling system of the present invention;

[0026] Figure 4 is the installation structural diagram of the air inlet unit in the conveyor - belt type automatic membrane - changing sampling system of the present invention;

[0027] Figure 5 is the structural diagram of the lower - membrane column propulsion assembly in the conveyor - belt type automatic membrane - changing sampling system of the present invention;

[0028] Figure 6 is the schematic diagram of the open state of the upper membrane cover of the air inlet unit in the conveyor - belt type automatic membrane - changing sampling system of the present invention;

[0029] Figure 7 is the schematic diagram of the state where the lower membrane column of the air inlet unit is separated from the upper membrane cover and the filter membrane belt can move forward for membrane replacement in the conveyor - belt type automatic membrane - changing sampling system of the present invention;

[0030] Figure 8Schematic diagram of the state where the lower membrane column and the upper membrane cover of the air intake unit in the belt - type automatic membrane - changing sampling system of the present invention compress the filter membrane belt;

[0031] Figure 9 Structural diagram of the new membrane reel in the belt - type automatic membrane - changing sampling system of the present invention;

[0032] Figure 10 Cross - sectional view of the new membrane reel in the belt - type automatic membrane - changing sampling system of the present invention;

[0033] Figure 11 Structural diagram of the used membrane reel in the belt - type automatic membrane - changing sampling system of the present invention;

[0034] Figure 12 Schematic diagram of the installation structure of the first roller in the belt - type automatic membrane - changing sampling system of the present invention;

[0035] Figure 13 Cross - sectional view of the first roller in the belt - type automatic membrane - changing sampling system of the present invention;

[0036] Figure 14 Schematic diagram of the installation structure of the second roller in the belt - type automatic membrane - changing sampling system of the present invention. Detailed implementation manners

[0037] As Figure 1 、 Figure 2 、 Figure 3 shown, a belt - type automatic membrane - changing sampling system of the present invention includes a bracket 01, a new membrane reel 02 connected to the bracket 01, one or more air intake units 03, a used membrane reel 04, a driving assembly 05, and a filter membrane belt 06. The new membrane reel 02, the air intake units 03, and the used membrane reel 04 are arranged in sequence from upstream to downstream. Specifically, the bracket 01 includes a rear column 12, a front column 11, a walking template 13, and a bottom plate 14. In this embodiment, four air intake units 03 are provided.

[0038] The new membrane reel 02 is adapted to rotate relative to the bracket 01.

[0039] The air intake unit 03 includes an upper membrane cover 32, a lower membrane column 33, and a lower membrane column pushing assembly. An air inlet 321 is provided on the upper membrane cover 32, and an air outlet 331 is provided on the lower membrane column 33. The upper membrane cover 32 is adapted to cover or leave the lower membrane column 33. The lower membrane column 33 is located below the upper membrane cover 32 and is vertically arranged. The filter membrane belt 06 is clamped between the lower membrane column 33 and the upper membrane cover 32. The lower membrane column pushing assembly is connected to the lower membrane column 33 and drives the lower membrane column 33 to move upward or downward.

[0040] The old film reel 04 is rotatably connected to the bracket 01, and the driving assembly 05 is connected to the old film reel 04. The driving assembly 05 is adapted to drive the old film reel 04 to rotate.

[0041] One end of the filter film belt 06 is wound around the new film reel 02 and the other end is wound around the old film reel 04.

[0042] During sample injection, the lower membrane column pushing assembly of each gas inlet unit 03 drives the lower membrane column 33 to move upward. The upper membrane cover 32 covers the lower membrane column 33 and clamps the filter film belt 06 between the lower membrane column 33 and the upper membrane cover 32. During membrane replacement, the upper membrane cover 32 of each gas inlet unit 03 is opened, the lower membrane column pushing assembly drives the lower membrane column 33 to move downward, the lower membrane column 33 is separated from the upper membrane cover 32, the driving assembly 05 drives the old film reel 04 to rotate, drives the filter film belt 06 to move, and the filter film clamped between the lower membrane column 33 and the upper membrane cover 32 moves downstream and is wound around the old film reel 04, and the new filter film wound around the new film reel 02 enters between the lower membrane column 33 and the upper membrane cover 32.

[0043] A conveyor belt type automatic membrane replacement sampling system of the present invention has the following working process:

[0044] Start the lower membrane column pushing assembly to drive the lower membrane column 33 to move upward. The lower membrane column 33 and the upper membrane cover 32 press the filter film belt 06, and the conveyor belt type automatic membrane replacement sampling system is in a closed state and starts sample injection. When a lot of dust accumulates on the filter film belt 06 and needs to be replaced after running for a period of time, start the lower membrane column pushing assembly to drive the lower membrane column 33 to move downward, loosen the filter film belt 06 and the upper membrane cover 32, start the driving assembly 05 to drive the old film reel 04 to rotate, drive the filter film belt 06 to move a certain distance, so that the new filter film belt reaches the sample injection place, start the lower membrane column pushing assembly again to press the lower membrane column 33 and the upper membrane cover 32 tightly, and start sample injection. Repeat the above steps whenever the filter film needs to be replaced. When the filter film belt 06 is about to run out and needs to be replaced, lower the lower membrane column 33, pull out the remaining filter film belt 06, remove the old filter film on the old film reel 04, and replace it with a new filter film.

[0045] The present invention relates to a conveyor belt type automatic film changing sampling system, which includes a new film reel 02, an air inlet unit 03, an old film reel 04, a driving assembly 05, and a filter film belt 06. One end of the filter film belt 06 is wound around the new film reel 02 and the other end is wound around the old film reel 04. By driving the old film reel 04 to rotate through the driving assembly 05, the filter film belt 06 moves in the form of a conveyor belt to complete the filter film replacement. Compared with other circular filter films, the sampling system of the present invention has a simpler mechanical structure. Only one driving assembly is needed to drive the entire device to perform the film changing operation, reducing the probability of mechanical failures caused by mechanical movements. At the same time, the volume of the device is also reduced, and no special space is required. It only needs to be placed beside the backend device and connected to the air outlet of the sampling tube and the air inlet of the device to achieve sample introduction. Moreover, compared with the single-piece filter film of other devices, the filter film belt in the system of the present invention has a longer service life, reducing the number of maintenance operations for maintenance personnel and effectively reducing the maintenance cost. Furthermore, since the filter film belt 06 moves in the form of a conveyor belt, multiple air inlet units 03 can be provided to improve the sampling efficiency.

[0046] Optionally, it further includes a first roller 07 and a second roller 08. The first roller 07 and the second roller 08 are both rotatably connected to the bracket 01. The first roller 07 is arranged between the new film reel 02 and the air inlet unit 03 located at the most upstream, and the second roller 08 is arranged between the air inlet unit 03 located at the most downstream and the old film reel 04. The filter film belt 06 bypasses the first roller 07 and the second roller 08. Specifically, the first roller 07 and the second roller 08 are both rotatably connected to the walking template 13 of the bracket 01. By the first roller 07 and the second roller 08, the moving direction of the filter film belt 06 is changed, the resistance during the movement of the filter film belt 06 is reduced, and the filter film belt 06 is limited, avoiding the deviation of the filter film belt 06 during the movement.

[0047] Optionally, as Figure 9 , Figure 10 , Figure 11 shown, the new film reel 02 and the old film reel 04 have the same structure. Among them, the new film reel 02 includes a reel 21, a reel pressing piece 22, a damping ring 23, a film winding cylinder 24, and a fixing nut 25. The filter film belt 06 is wound around the outside of the film winding cylinder 24. The reel 21 is rotatably connected to the bracket 01. The reel pressing piece 22 is sleeved on the reel 21. The damping ring 23 is sleeved outside the reel 21, and the damping ring 23 is pressed between the reel pressing piece 22 and the reel 21. The film winding cylinder 24 is sleeved outside the damping ring 23. The fixing nut 25 is sleeved outside the reel 21, and the fixing nut 25 is located outside the reel pressing piece 22. The fixing nut 25 is used to lock the reel pressing piece 22. Specifically, the reel 21 is rotatably connected to the rear column 12 of the bracket 01. Since the new film reel 02 includes a reel 21, a reel pressing piece 22, a damping ring 23, a film winding cylinder 24, and a fixing nut 25, and the film winding cylinder 24 is sleeved outside the damping ring 23, the film winding cylinder 24 is convenient to disassemble, which is convenient for replacement when the filter film belt 06 is used up.

[0048] Optionally, the outer wall of the reel 21 is provided with a first boss 211, a second boss 212, and a third boss 213, the outer wall of the reel pressing plate 22 is provided with a fourth boss 221, a fifth boss 222, and a sixth boss 223, the sixth boss 223 forms a cone along the axial direction, the damping ring 23 is sleeved on the third boss 213 and the sixth boss 223, and the two ends of the damping ring 23 are clamped between the second boss 212 and the fifth boss 222, the film collecting tube 24 is sleeved outside the second boss 212 and the fifth boss 222, and the two ends of the film collecting tube 24 are clamped between the first boss 211 and the fourth boss 221. Since the damping ring 23 is sleeved on the third boss 213 and the sixth boss 223, and the sixth boss 223 is conical, during the axial movement of the reel pressure plate 22 by rotating the fixing nut 25, the sixth boss 223 opens the damping ring 23, so that the damping ring 23 squeezes the film collecting barrel 24, ensuring that the film collecting barrel 24 and the reel 21 keep rotating synchronously, avoiding the situation where the driving component 05 is started but the filter membrane belt 06 does not move.

[0049] Specifically, the fixing nut 25 is a hand-tightened nut, one end of the reel 21 extends out of the rear column 12, the reel 21 is connected to the rear column 12 through a bearing 26, and the part of the reel 21 extending out of the rear column is also equipped with a synchronous pulley 27, which is fixed by a nut 271. During installation, install the reel 21 on the rear column 12, and insert the bearings 26 on both sides of the reel 21. The reel 21 plays a role of fixing and driving the rotation. Insert the synchronous pulley 27 on the back of the reel 21 and tighten the nut 271. The synchronous pulley 27 is used to fix the axial position of the reel 21 and plays a spare role. Install the new filter membrane belt 06 on the film collecting barrel 24, and install the damping ring 23, the film collecting barrel 24, and the reel pressing piece 22 on the reel 21 from the front in turn, and then tighten the fixing nut 25. After tightening, the reel pressing piece 22 and the reel 21 press the damping ring 23. The damping ring 23 expands outward to tighten the film collecting barrel 24, so that the film collecting barrel 24 and the reel 21 rotate synchronously.

[0050] Optionally, the old membrane roll 04 also includes a stop pin 41, which is a slender rod connected to the old membrane roll 41, and the stop pin 41 extends along the axial direction of the old membrane roll 04, with a gap between the stop pin 41 and the outer wall of the old membrane roll 04. One end of the filter membrane belt 06 wrapped around the old membrane roll 04 is first wrapped around the stop pin 41 for at least one circle to fix the filter membrane belt 06, so as to prevent the filter membrane belt 06 from sliding on the old membrane roll 04, so as to prevent the filter membrane belt 06 from being unable to roll up at the same time when the old membrane roll 04 rotates, thereby causing the membrane replacement to fail.

[0051] Alternatively, if Figure 12 , Figure 13 , Figure 14As shown, the first roller 07 and the second roller 08 have the same structure. Among them, the first roller 07 is provided with a first retaining piece 71 and a second retaining piece 72 on its surface. The first retaining piece 71 and the second retaining piece 72 are respectively located at both ends of the first roller 07 along the length direction. It also includes a rubber-coated cylinder 73, a front support block 74, and a rotating shaft 75. The rubber-coated cylinder 73 is installed on the rotating shaft 72 through a bearing. The first retaining piece 71 and the second retaining piece 72 are sleeved on the rotating shaft 75. The first retaining piece 71 and the second retaining piece 72 are respectively located on both sides of the rubber-coated cylinder 73. The first retaining piece 71 and the second retaining piece 72 protrude radially outside the rubber-coated cylinder 73. One end of the rotating shaft 75 is connected to the rear column 12 of the bracket 01, and the other end of the rotating shaft 75 passes through the front support block 74. The front support block 74 is connected to the moving template 13 through a nut. The first retaining piece 71 and the second retaining piece 72 limit the left and right sliding of the filter membrane belt 06. The second roller 08 is provided with a third retaining piece 81 and a fourth retaining piece 82 on its surface. The third retaining piece 81 and the fourth retaining piece 82 are respectively located at both ends of the second roller 08 along the length direction. The third retaining piece 81 and the fourth retaining piece 82 protrude radially from the surface of the second roller 08. Specifically, the second roller 08 further includes a rubber-coated cylinder 83, a front support block 84, and a rotating shaft 85. It also includes a photoelectric sensor 09 and a control unit. The photoelectric sensor 09 is connected to the control unit, and the control unit is connected to the driving assembly 05. The photoelectric sensor 09 is arranged close to the third retaining piece 81 of the second roller 08. The third retaining piece 81 completely blocks the photosensitive element of the photoelectric sensor 09. A notch 811 is provided on the third retaining piece 81. When the notch 811 corresponds to the photoelectric sensor 09, the blocking signal disappears. The photoelectric sensor 09 sends a signal to the control unit. The control unit determines the number of turns of the second roller 08 based on the number of times the signal disappears. The moving length of the filter membrane belt 06 can be obtained by multiplying the number of turns of the second roller 08 by the circumference of the rubber-coated cylinder. The driving assembly 05 is started or stopped according to the number of turns of the second roller 08. Specifically, the photoelectric sensor 09 is connected to the moving template 13 of the bracket 01 through a sensor bracket 91. The third retaining piece 81 and the third retaining piece 82 limit the left and right sliding of the filter membrane belt 06. Automatic film replacement is realized through the photoelectric sensor 09 and the control unit, reducing the number of operations and maintenance by operation and maintenance personnel, reducing the operation and maintenance cost, improving the operation and maintenance efficiency, and accurately controlling the film walking length of the filter membrane belt 06 to avoid waste of the filter membrane belt.

[0052] Optionally, as Figure 2As shown, the driving assembly 05 includes a motor 51, a driving pulley 52, a tension pulley 53, a driven pulley 54, and a synchronous belt 55. The driving pulley 52 is connected to the output shaft of the motor 51. The driven pulley 54 is connected to the old film reel 04 to drive the old film reel 04 to rotate synchronously. The tension pulley 53 is connected to the bracket 01. The synchronous belt 55 is wound around the driving pulley 52, the tension pulley 53, and the driven pulley 54. Specifically, the motor 51 is a reduction motor. The motor 51 is installed on the bottom plate 14. The tension pulley 53 is installed on the rear column 13. The hole on the rear pillar 13 for installing the tension pulley 53 is a straight slot. When the synchronous belt 55 becomes loose due to long-term operation, the tension pulley 53 can be adjusted to make it re-tightened.

[0053] Optionally, as Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 shown, the air intake unit 03 further includes a film cover connecting plate 31. The upper film cover 32 is connected to the film cover connecting plate 31. One end of the film cover connecting plate 31 is hinged to the bracket 01. The film cover connecting plate 31 is adapted to drive the upper film cover 32 to rotate to open or close the upper film cover 32. Specifically, the film cover connecting plate 31 is hinged to the template 13 of the bracket 01. The upper film cover 32 is connected to the template 13 through the upper cover fixing screw 323. When changing the film, the upper cover fixing screw 323 can be removed.

[0054] Optionally, the lower film column pushing assembly includes a push rod 341, a fork 342, and a fork mounting block 343. The fork mounting block 343 is located on one side of the lower film column 33. The fork mounting block 343 is connected to the bracket 01. A through hole 334 is provided at the bottom of the lower film column 33. The through hole 334 is arranged along the radial direction of the lower film column 33. The push rod 341 is vertically arranged. One end of the fork 342 is hinged to the top of the push rod 341 and the other end extends into the through hole 334. The middle of the fork 342 is rotatably connected to the fork mounting block 343. When the push rod 341 moves upward, the fork 342 drives the lower film column 33 to move downward. When the push rod 341 moves downward, the fork 342 drives the lower film column 33 to move upward. Specifically, the bottom of the push rod 341 is connected to the push rod support 345. The middle of the fork 342 is connected to the fork mounting block 343 through a bearing. As Figure 7 shown, when film changing is required, the push rod 341 is moved upward to press down the lower film column 33 through the fork 342, and the upper film cover 32 is rotated. The motor 51 is started to drive the filter film belt 06 to move forward. When the old filter film leaves the sampling position and the new filter film moves into place, the push rod 341 is moved downward to drive the lower film column 33 to move upward, and the lower film column 33 and the upper film cover 32 re-press the filter film, as Figure 8 shown. The push rod 341 and the fork 342 are used to drive the lower film column 33 to move up and down, with a simple structure and convenient operation.

[0055] Optionally, as Figure 3As shown, the intake unit 03 further includes a pressure spring 35 and a lower membrane guide cylinder 36. The outer wall of the lower membrane column 33 is stepped. A part of the lower membrane column 33 is disposed inside the lower membrane guide cylinder 36. The bottom of the lower membrane column 33 passes through the lower membrane guide cylinder 36 and extends outside the lower membrane guide cylinder 36. The lower membrane column 33 is adapted to move up and down relative to the lower membrane guide cylinder 36. The pressure spring 35 is sleeved on the small-diameter part of the lower membrane column 33. The upper end of the pressure spring 35 abuts against the outer wall boss of the lower membrane column 33, and the lower end abuts against the bottom of the lower membrane guide cylinder 36. When the lower membrane column 33 moves upward for sampling, the elastic force of the pressure spring 35 acts on the lower membrane column 33, further pressing the filter membrane strip 06 tightly by the lower membrane column 33 and the upper membrane cover 32, enhancing the sealing performance of the entire sampling system.

[0056] Optionally, the intake unit 03 further includes a sealing ring 37. The sealing ring 37 is disposed between the upper membrane cover 32 and the lower membrane column 33. The sealing ring 37 is an O-ring.

[0057] Optionally, the intake unit 03 further includes an intake nozzle 322 and an outlet nozzle 332. The intake nozzle 322 is disposed on the intake port 321, and the outlet nozzle 332 is disposed on the outlet port 331. During sampling, the sampled gas enters the filter membrane unit through the intake nozzle 322, and after being filtered by the filter membrane, it enters the monitoring device through the outlet nozzle 332.

[0058] The embodiments described above are merely descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A conveyor belt type automatic membrane replacement sampling system, characterized in that: The invention comprises a support (01), a new film reel (02) connected to the support (01), at least one air inlet unit (03), an old film reel (04), a drive assembly (05), and a filter membrane belt (06), wherein the new film reel (02), the air inlet unit (03), and the old film reel (04) are arranged in sequence from upstream to downstream. The new film roll (02) is suitable for rotating relative to the support (01). The air inlet unit (03) comprises an upper membrane cover (32), a lower membrane column (33), and a lower membrane column pushing assembly. The upper membrane cover (32) is provided with an air inlet (321), and the lower membrane column (33) is provided with an air outlet (331). The upper membrane cover (32) is suitable for covering the lower membrane column (33) or leaving the lower membrane column (33). The lower membrane column (33) is located below the upper membrane cover (32). The lower membrane column (33) is vertically arranged. The filter membrane belt (06) is clamped between the lower membrane column (33) and the upper membrane cover (32). The lower membrane column pushing assembly is connected to the lower membrane column (33). The lower membrane column pushing assembly drives the lower membrane column (33) to move upward or downward. The old film reel (04) is rotatably connected to the bracket (01), the driving assembly (05) is connected to the old film reel (04), and the driving assembly (05) is suitable for driving the old film reel (04) to rotate. One end of the filter membrane tape (06) is wound around the new membrane drum (02) and the other end is wound around the old membrane drum (04). When injecting samples, the lower membrane column pushing assembly of each of the air inlet units (03) drives the lower membrane column (33) to move upward, and the upper membrane cover (32) is covered on the lower membrane column (33) to clamp the filter membrane belt (06) between the lower membrane column (33) and the upper membrane cover (32). When changing the membrane, the upper membrane cover (32) of each of the air inlet units (03) is opened, and the lower membrane column (33) is driven by the lower membrane column pushing assembly to move downward, and the lower membrane column (33) is separated from the upper membrane cover (32). The driving assembly (05) drives the old membrane reel (04) to rotate, and drives the filter membrane belt (06) to move. The filter membrane clamped between the lower membrane column (33) and the upper membrane cover (32) moves downstream and is wound around the old membrane reel (04). The filter membrane wound on the new membrane reel (04) enters between the lower membrane column (33) and the upper membrane cover (32).

2. The conveyor belt type automatic membrane replacement sampling system according to claim 1 is characterized in that: It also includes a first roller (07) and a second roller (08), wherein the first roller (07) and the second roller (08) are both rotatably connected to the bracket (01), the first roller (07) is arranged between the new film roll (02) and the air intake unit (03) located at the most upstream, and the second roller (08) is arranged between the air intake unit (03) located at the most downstream and the old film roll (04), and the filter membrane belt (06) bypasses the first roller (07) and the second roller (08).

3. The conveyor belt type automatic membrane replacement sampling system according to claim 1 is characterized in that: The new film reel (02) and the old film reel (04) have the same structure, wherein the new film reel (02) comprises a reel (21), a reel pressing plate (22), a damping ring (23), a film collecting cylinder (24), and a fixing nut (25); the filter membrane belt (06) is wound around the film collecting cylinder (24); the reel (21) is rotatably connected to the bracket (01); the reel pressing plate (22) is sleeved on the reel (21); The damping ring (23) is sleeved outside the reel (21), and the damping ring (23) is squeezed between the reel pressure plate (22) and the reel (21), the film winding tube (24) is sleeved outside the damping ring (23), the fixing nut (25) is sleeved outside the reel (21), the fixing nut (25) is located outside the reel pressure plate (22), and the fixing nut (25) is used to lock the reel pressure plate (22).

4. The conveyor belt type automatic membrane replacement sampling system according to claim 3 is characterized in that: The outer wall of the winding shaft (21) is provided with a first boss (211), a second boss (212), and a third boss (213); the outer wall of the winding shaft pressing plate (22) is provided with a fourth boss (221), a fifth boss (222), and a sixth boss (223); the sixth boss (223) is conical; the damping ring (23) is sleeved on the third boss (213) and the sixth boss (223); two ends of the damping ring (23) are clamped between the second boss (212) and the fifth boss (222); the film collecting tube (24) is sleeved outside the second boss (212) and the fifth boss (222); two ends of the film collecting tube (24) are clamped between the first boss (211) and the fourth boss (221).

5. The conveyor belt type automatic membrane replacement sampling system according to claim 4 is characterized in that: The old membrane reel (04) further comprises a stop pin (41), which is a slender rod connected to the old membrane reel (41). The stop pin (41) extends along the axial direction of the old membrane reel (04), and a gap is left between the stop pin (41) and the outer wall of the old membrane reel (04). One end of the filter membrane belt (06) wound around the old membrane reel (04) first wraps around the stop pin (41) at least once.

6. The conveyor belt type automatic membrane replacement sampling system according to claim 2 is characterized in that: The first roller (07) and the second roller (08) have the same structure, wherein a third baffle (81) and a fourth baffle (82) are arranged on the surface of the second roller (08), the third baffle (81) and the fourth baffle (82) are respectively located at two ends of the second roller (08) along the length direction, the third baffle (81) and the fourth baffle (82) radially protrude from the surface of the second roller (08), and further comprise a photoelectric sensor (09) and a control unit, wherein the photoelectric sensor (09) is connected to the control unit, and the control unit is connected to the driving component (05). The photoelectric sensor (09) is arranged close to the third baffle (81) of the second roller (08), the third baffle (81) completely blocks the photosensitive element of the photoelectric sensor (09), the third baffle (81) is provided with a notch (811), when the notch (811) corresponds to the photoelectric sensor (09), the blocking signal disappears, the photoelectric sensor (09) sends a signal to the control unit, the control unit determines the number of revolutions of the second roller (08) according to the number of times the signal disappears, and controls the driving component (05) to start or stop according to the number of revolutions.

7. The conveyor belt type automatic membrane replacement sampling system according to claim 1 is characterized in that: The driving assembly (05) comprises a motor (51), a driving pulley (52), a tensioning pulley (53), a driven pulley (54), and a synchronous belt (55); the driving pulley (52) is connected to the output shaft of the motor (51); the driven pulley (54) is connected to the old film reel (04) to drive the old film reel (04) to rotate synchronously; the tensioning pulley (53) is connected to the bracket (01); and the synchronous belt (55) is wound around the driving pulley (52), the tensioning pulley (53), and the driven pulley (54).

8. The conveyor belt type automatic membrane replacement sampling system according to claim 1 is characterized in that: The air intake unit (03) further comprises a membrane cover connecting plate (31), the upper membrane cover (32) is connected to the membrane cover connecting plate (31), one end of the membrane cover connecting plate (31) is hinged to the bracket (01), and the membrane cover connecting plate (31) is suitable for driving the upper membrane cover (32) to rotate.

9. The conveyor belt type automatic membrane replacement sampling system according to claim 8, characterized in that: The lower membrane column pushing assembly comprises a push rod (341), a shift fork (342), and a shift fork mounting block (343); the shift fork mounting block (343) is located on one side of the lower membrane column (33); the shift fork mounting block (343) is connected to the bracket (01); a through hole (334) is provided at the bottom of the lower membrane column (33); the through hole (334) is provided along the radial direction of the lower membrane column (33); the push rod (341) is vertically arranged; One end of the shift fork (342) is hinged to the top of the push rod (341), and the other end extends into the through hole (334). The middle part of the shift fork (342) is rotatably connected to the shift fork mounting block (343). When the push rod (341) moves upward, the shift fork (342) drives the lower membrane column (33) to move downward. When the push rod (341) moves downward, the shift fork (342) drives the lower membrane column (33) to move upward.

10. The conveyor belt type automatic membrane replacement sampling system according to claim 9, characterized in that: The air intake unit (03) also includes a pressure spring (35) and a lower membrane guide tube (36). The outer wall of the lower membrane column (33) is stepped. Part of the lower membrane column (33) is arranged in the lower membrane guide tube (36). The bottom of the lower membrane column (33) passes through the lower membrane guide tube (36) and extends out of the lower membrane guide tube (36). The lower membrane column (33) is suitable for moving up and down relative to the lower membrane guide tube (36). The pressure spring (35) is sleeved on the small diameter part of the lower membrane column (33). The upper end of the pressure spring (35) abuts against the outer wall boss of the lower membrane column (33) and the lower end abuts against the bottom of the lower membrane guide tube (36).

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