Chemical dangerous gas detection device and detection method

Abstract

This invention relates to the field of gas detection technology, and in particular to a chemical hazardous gas detection device and method. The detection device includes a collection cylinder, an outer cylinder, a drive mechanism, a detector, and a gas circulation mechanism. The outer cylinder is slidably disposed within the collection cylinder, and the lower chamber of the top plate of the outer cylinder is configured as an openable and closable detection chamber. The drive mechanism is disposed within the collection cylinder and is used to drive the movement of the outer cylinder within the collection cylinder. The detector is installed within the outer cylinder and is used to detect the gas concentration within the detection chamber. The gas circulation mechanism is disposed within the collection cylinder and is configured to maintain gas flow within the detection chamber when the detector detects the gas. The chemical hazardous gas detection device provided by this invention can reduce the influence of gas residue on the detection results and reduce the possibility of data distortion.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, specifically to a chemical hazardous gas detection device and detection method. Background Technology

[0002] Accurate detection of toxic and harmful gas concentrations is crucial in many fields, including industrial production, environmental protection, and daily life. The presence of toxic and harmful gases not only pollutes the environment but also poses a serious threat to human health. Therefore, reliable toxic and harmful gas concentration detection and alarm devices are among the key pieces of equipment for ensuring safety.

[0003] In existing toxic and harmful gas detection devices, the gas to be detected is usually first introduced into the detection chamber, and then the detection unit inside the detection chamber performs the gas detection.

[0004] However, when existing detection devices detect different gases in succession, the gas detected earlier may remain in the detection chamber, which in turn affects the gas detected later, causing the detection data to be distorted. Summary of the Invention

[0005] This invention provides a chemical hazardous gas detection device and detection method. The chemical hazardous gas detection device can reduce the impact of gas residue on the detection results and reduce the possibility of data distortion.

[0006] The chemical hazardous gas detection device and detection method of the present invention adopts the following technical solution:

[0007] A chemical hazardous gas detection device includes a collection cylinder, an outer cylinder, a drive mechanism, a detector, a gas circulation mechanism, and an exhaust plate. The outer cylinder is slidably disposed within the collection cylinder, and the lower chamber of the top plate of the outer cylinder is configured as an openable and closable detection chamber. The drive mechanism is disposed within the collection cylinder and is used to drive the movement of the outer cylinder within the collection cylinder. The detector is installed within the outer cylinder and is used to detect the gas concentration within the detection chamber. The gas circulation mechanism is disposed within the collection cylinder and is configured to maintain gas flow within the detection chamber when the detector detects the gas. The gas circulation mechanism includes a gas pump and a circulation channel. On the cylinder, a circulation channel is opened inside the collection cylinder. One end of the circulation channel is connected to the detection chamber through a pipe, and the other end is connected to the air inlet of the air pump. A control valve is installed inside the circulation channel. There are multiple venting plates, which are evenly arranged along the axial direction of the inner cavity of the collection cylinder. The outer cylinder slides between the venting plates and the collection cylinder. The venting plates are provided with through holes with opening and closing functions. The outer cylinder is provided with a push block for controlling the opening and closing of the through holes. The push block is configured such that when the push block rises and passes two adjacent venting plates, the through hole on the lower venting plate changes from closed to open, and the through hole on the upper venting plate changes from open to closed.

[0008] The bottom of the collection tube has a gas collection chamber located on one side of the detection chamber. The collection tube has an outlet air passage, the two ends of which are connected to the gas collection chamber and the outlet of the air pump, respectively. A control valve is installed in the outlet air passage. A dustproof net that can be covered at the opening of the tube is installed at the bottom of the collection tube.

[0009] The collection tube has an air venting channel. One end of the air venting channel is connected to the air inlet of the air pump, and the other end is connected to the cavity between the adjacent air venting plates through a pipe.

[0010] Furthermore, the venting plate includes a fixed venting plate and a movable venting plate, with the fixed venting plate fixed inside the collection tube;

[0011] Multiple movable venting plates are provided. The movable venting plates are slidably set in the inner cavity of the collection tube and are connected to the inner cavity of the collection tube by a snap-fit ​​assembly. In the axial direction of the inner cavity of the collection tube, the multiple movable venting plates are arranged at equal intervals from top to bottom below the fixed venting plate through the snap-fit ​​assembly.

[0012] Furthermore, the snap-fit ​​assembly includes a slot and an elastic snap-fit ​​member. The slot is formed in the collection tube, and the elastic snap-fit ​​member is disposed on the movable venting plate for snapping the movable venting plate into the slot.

[0013] Furthermore, the bottom end of the outer cylinder is provided with a lifting rod, which is used to release the restriction of the position of the movable venting plate in the collection cylinder by the locking assembly, and can cooperate with the elastic locking member to drive the movable venting plate to rise.

[0014] Furthermore, a diffusion unit is provided at the bottom of the collection tube. The diffusion unit includes a diffusion fan and a belt drive assembly. The diffusion fan is installed at the bottom opening of the collection tube to diffuse external air into the collection tube, and the belt drive assembly drives the diffusion fan to rotate.

[0015] A method for detecting hazardous gases in the chemical industry, using the aforementioned hazardous gas detection device.

[0016] The beneficial effects of this invention are:

[0017] The present invention discloses a chemical hazardous gas detection device. Before the detector detects the gas in the detection area, the detection chamber is opened and the gas circulation mechanism is run. When the gas fills the detection chamber, the detector detects the gas in the detection chamber. Before gas detection, the gas circulation mechanism can continuously draw gas from the detection area into the detection chamber, and can also continuously discharge residual gas and newly drawn gas from the detection chamber, thereby reducing the proportion of residual gas in the gas in the detection chamber, and thus making the detection results of the present invention more accurate.

[0018] After the gas detection is completed, the detection chamber is closed, and the outer cylinder is raised inside the collection cylinder by the drive mechanism, which makes the detection chamber larger. This can dilute the gas in the detection chamber and prevent the detector from detecting data that would trigger an alarm.

[0019] In addition, during the dilution process, the gas circulation mechanism can be activated to discharge as much gas as possible from the detection chamber into the collection tube, reducing the amount of gas remaining in the detection chamber. This makes the invention less affected by residual gas when detecting gas in a new area, resulting in more accurate data.

[0020] Furthermore, as the outer cylinder rises within the collection cylinder, the pusher block gradually closes multiple venting plates from bottom to top, thereby dividing the detection chamber into cavities between multiple adjacent venting plates, and a cavity between the top plate of the outer cylinder and the top venting plate. During the outer cylinder's ascent, the position of the detection chamber changes, and the cavities between the multiple adjacent venting plates from bottom to top detach from the detection chamber. This reduces the total amount of gas within the detection chamber, diluting the gas and decreasing the residual proportion of gas. Consequently, when detecting gas in new areas, this invention is less affected by residual gas, resulting in more accurate detection results.

[0021] Furthermore, when the outer cylinder rises, it can drive the lifting rod to rise, and when the lifting rod rises, it can push the movable venting plate to rise. When the movable venting plate rises, it can squeeze the gas in the non-detection chamber above the movable venting plate out of the through hole. Finally, multiple movable venting plates are stacked under the fixed venting plate, which greatly reduces the gas remaining between adjacent movable venting plates and further reduces the impact of residual gas on the detection results.

[0022] A method for detecting hazardous gases in the chemical industry is provided, which utilizes the aforementioned hazardous gas detection device. The operation steps are simple and clear. By using the aforementioned hazardous gas detection device, it is possible to detect the concentration of hazardous gases in different detection areas. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a chemical hazardous gas detection device provided in an embodiment of the present invention;

[0025] Figure 2 This is a partial explosion structure diagram of a chemical hazardous gas detection device provided in an embodiment of the present invention;

[0026] Figure 3 This is a partial explosion structure diagram of the collection cylinder and outer cylinder of a chemical hazardous gas detection device provided in an embodiment of the present invention;

[0027] Figure 4 This is a partial exploded structural diagram of the outer cylinder and internal structure of a chemical hazardous gas detection device provided in an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the explosion structure of the vent plate of a chemical hazardous gas detection device provided in an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of the explosive cross-sectional structure of the collection cylinder and inner cylinder of a chemical hazardous gas detection device provided in an embodiment of the present invention;

[0030] Figure 7 This is a top view of the collection tube of a chemical hazardous gas detection device provided in an embodiment of the present invention;

[0031] Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure along the AA direction;

[0032] Figure 9 for Figure 7 A schematic diagram of the cross-sectional structure along the BB direction;

[0033] Figure 10 for Figure 9 A magnified structural diagram of section D;

[0034] Figure 11 for Figure 8 A schematic diagram of the cross-sectional structure along the CC direction.

[0035] In the diagram: 10, guide rail; 11, alarm; 100, collection tube; 110, gas collection chamber; 120, air outlet channel; 130, exhaust channel; 140, limiting groove; 150, inner tube; 151, second limiting hole; 152, through slot; 200, outer tube; 210, push block; 220, first limiting hole; 230, lifting rod; 300, drive mechanism; 400, detector; 510, air pump; 52 0. Circulating flow channel; 530. Control valve; 600. Diffusion unit; 610. Diffusion fan; 620. Belt drive assembly; 700. Dustproof net; 800. Exhaust plate; 801. Fixed exhaust plate; 802. Movable exhaust plate; 810. Corrugated cylinder; 811. Annular groove; 820. Through hole; 821. Slide groove; 830. Magnetic plate; 900. Snap-fit ​​assembly; 910. Snap-fit ​​slot; 920. Flexible snap-fit ​​component. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0038] like Figures 1 to 11 As shown, a chemical hazardous gas detection device includes a collection cylinder 100, an outer cylinder 200, a drive mechanism 300, a detector 400, and a gas circulation mechanism. A guide rail 10 is provided within the detection area, and an alarm 11 can be mounted on the guide rail 10. The alarm 11 is an intelligent alarm capable of processing gas concentration data and providing feedback, and it contains a data processing unit. The alarm 11 can slide on the guide rail 10, and the collection cylinder 100 can be mounted on the alarm 11. By changing the position of the alarm 11 on the guide rail 10, the collection cylinder 100 can be positioned at different heights within the detection area.

[0039] In this invention, the outer cylinder 200 is slidably disposed within the inner cavity of the collection cylinder 100, and the lower chamber of the top plate of the outer cylinder 200 is configured as a detection chamber that can be opened and closed. A detector 400 is disposed within the outer cylinder 200 and mounted on its top plate. The detector 400 is used to detect the concentration of harmful gases within the detection chamber. The processing unit of the alarm 11 can receive the detection data emitted by the detector 400 and determine whether to issue an alarm based on a comparison of the detection data with a safety threshold. Because the alarm 11 is movable on the guide rail 10, this invention can detect gases at different heights within the detection area, making the alarm information more accurate.

[0040] The drive mechanism 300 is disposed inside the collection cylinder 100 and is used to drive the outer cylinder 200 to move within the collection cylinder 100. The drive mechanism 300 can be an axial drive structure consisting of a motor and a lead screw. The motor of the drive mechanism 300 can be mounted on the top wall of the inner cavity of the collection cylinder 100. One end of the lead screw of the drive mechanism 300 is fixed to the output shaft of the motor, and the other end passes through the top plate of the outer cylinder 200 and extends into the detection cavity.

[0041] A gas circulation mechanism is installed on the collection tube 100. When the detector 400 detects the gas in the detection chamber, the gas circulation mechanism can maintain the flow of gas in the detection chamber.

[0042] The operating principle of this invention is as follows:

[0043] First, the present invention is placed in the detection area, then the detection cavity is opened, and then the outer cylinder 200 is driven to descend inside the collection cylinder 100 by the drive mechanism 300, so that the detection cavity shrinks. When the detection cavity shrinks to a suitable size, the operation of the drive mechanism 300 is stopped.

[0044] Then, the gas circulation mechanism is activated, which maintains the flow of gas within the detection chamber. Afterward, the system waits for the gas in the detection area to fill the detection chamber. While maintaining the flow of gas within the detection chamber, the gas circulation structure can simultaneously transport the gas originally remaining in the detection chamber along with the newly entering gas to the outside of the invention. This not only reduces the amount of residual gas remaining in the detection chamber but also accelerates the speed at which the gas in the new area fills the detection chamber.

[0045] Once the detection chamber is filled with gas from the new area, detector 400 detects the concentration of harmful gases in the gas and transmits the detection data to the data processing unit in alarm 11 via data transmission structures such as data cables. The data processing unit in alarm 11 analyzes the received data and compares it with a safety threshold to determine whether the concentration of harmful gases in the detection chamber exceeds the limit. When the detected concentration of harmful gases exceeds the safety threshold, alarm 11 sounds an alarm; when the detected concentration of harmful gases does not exceed the safety threshold, alarm 11 does not respond.

[0046] After the concentration of harmful gases is detected, the detection chamber is closed, and then the outer cylinder 200 is driven to rise within the collection cylinder 100 via the drive mechanism 300. During this period, the operation of the gas circulation mechanism is stopped. As the outer cylinder 200 rises within the collection cylinder 100, it increases the volume of the detection chamber, thereby diluting the gas within the detection chamber and reducing the proportion of residual gas in the detection chamber.

[0047] When the outer cylinder 200 rises to the initial height inside the collection cylinder 100, the operation of the drive mechanism 300 is stopped, and the positions of the collection cylinder 100 and the alarm 11 on the guide rail 10 are changed, so that the collection cylinder 100 enters different height positions within the detection area. Then the above detection process is repeated to achieve gas detection at multiple height positions within the detection area.

[0048] In this invention, when the gas remaining in the detection chamber enters the new detection area, it is immediately transported out of the collection tube 100 by the gas circulation mechanism, which reduces the residual gas in the detection chamber and thus reduces the impact of the residual gas on the current detection, making the gas detection results more accurate.

[0049] Of course, during the above detection process, while the outer cylinder 200 is driven to rise inside the collection cylinder 100 by the drive mechanism 300, the gas circulation mechanism can also continue to operate. At this time, the gas circulation mechanism can only play a certain suction role in the detection chamber, which can further reduce the residual gas in the detection chamber and further reduce the impact of residual gas on the gas concentration detection in the new detection area.

[0050] In some embodiments, the gas circulation mechanism includes an air pump 510 and a circulation channel 520. A fixing groove is provided at the top of the collection cylinder 100, and the air pump 510 is installed in the fixing groove. The circulation channel 520 is formed inside the collection cylinder 100. One end of the circulation channel 520 is connected to a flexible pipe (not shown in the figure). The end of the flexible pipe away from the circulation channel 520 is connected to the top plate of the outer cylinder 200 and communicates with the detection chamber. The other end leads to the fixing groove and communicates with the air inlet of the air pump 510. The air outlet of the air pump 510 leads to the outside of the collection cylinder 100.

[0051] A control valve 530 is installed within the circulation channel 520. By controlling the opening and closing of the control valve 530, the flow of gas within the detection chamber can be achieved. Residual gas within the detection chamber can flow along with the gas in the detection area within the circulation channel 520, and then be discharged from the outlet of the air pump 510 into the collection tube 100, thereby reducing gas residue. Reduced residual gas minimizes the impact of this invention on gas detection in new detection areas, resulting in more accurate gas detection data in those new areas.

[0052] Furthermore, a diffusion unit 600 is provided at the bottom of the collection cylinder 100. The diffusion unit 600 includes a diffusion fan 610 and a belt drive assembly 620. The diffusion fan 610 is installed at the bottom opening of the collection cylinder 100 and is used to diffuse outside air into the collection cylinder 100. The belt drive assembly 620 is a conventional belt and motor combination structure. The belt drive assembly 620 is located at the bottom of the collection cylinder 100 and is used to drive the diffusion fan 610 to rotate.

[0053] When the diffusion fan 610 rotates, the fan can push the gas outside the collection tube 100 into the inner cavity of the collection tube 100, thereby improving the detection efficiency of the present invention.

[0054] Furthermore, a gas collecting chamber 110 is provided at the bottom of the collecting cylinder 100, and a dustproof net 700 is provided thereon. The gas collecting chamber 110 is located on one side of the inner cavity of the collecting cylinder 100. An air outlet channel 120 is provided on the collecting cylinder 100. The two ends of the air outlet channel 120 are respectively connected to the gas collecting chamber 110 and the air outlet of the air pump 510. A control valve 530 is provided inside the air outlet channel 120.

[0055] When the collection tube 100 is provided with an air outlet channel 120, the air outlet of the air pump 510 is directly connected to the outside of the collection tube 100 and a control valve 530 is also provided in the channel.

[0056] The invention is placed in a new detection area. During the process before the detector 400 completes the gas detection in the detection chamber, the control valve 530 and the air pump 510 in the circulation channel 520 are kept open. The process includes two stages: a preparation stage and a detection stage.

[0057] During the preparation phase, which is before the detector 400 begins detecting the gas in the detection chamber, the control valve 530 in the flow channel directly leading to the outside of the collection tube 100 is open, while the control valve 530 in the outlet flow channel 120 is closed. The gas in the detection area is filling the detection chamber. During this phase, the air pump 510 can transport the residual gas in the detection chamber, along with some newly entering gas, to the outside of the collection tube 100, thereby reducing the impact of residual gas on the detection of the new area's gas.

[0058] During the detection phase, when the detector 400 is detecting the gas in the detection chamber, the control valve 530 in the outlet gas flow channel 120 is open, while the control valve 530 in the flow channel leading to the outside of the collection cylinder 100 is closed. The gas in the detection area has filled the detection chamber, and the air pump 510 in this phase can deliver the gas from the detection chamber to the gas collection chamber 110. Because the gas collection chamber 110 is close to the inner cavity of the collection cylinder 100, some of the gas flowing out of the gas collection chamber 110 may re-enter the inner cavity of the collection cylinder 100, replenishing the gas in the detection area. Furthermore, the gas flowing out of the gas collection chamber 110 can flush the dustproof net 700 at the bottom of the collection cylinder 100, thus enabling the invention to be applied in dusty environments, broadening its application range.

[0059] In some embodiments, the chemical hazardous gas detection device further includes multiple venting plates 800. The multiple venting plates 800 are all installed in the inner cavity of the collection cylinder 100 and are evenly distributed along the axial direction of the inner cavity of the collection cylinder 100.

[0060] In this embodiment, multiple venting plates 800 are fixed in the inner cavity of the collection tube 100, and adjacent venting plates 800 are connected by corrugated tubes 810 that can elastically expand and contract. Specifically, annular grooves 811 are provided on the opposite side of adjacent venting plates 800, and the two ends of the corrugated tubes 810 are respectively inserted into and fixed to the bottom of the annular grooves 811.

[0061] Multiple drainage plates 800 are provided with through holes 820, and the through holes 820 of the multiple drainage plates 800 are axially connected. A sliding groove 821 is provided on the side wall of the through hole 820, and the sliding groove 821 is composed of two symmetrical grooves connected together. Two magnetic plates 830 are slidably disposed within the sliding groove 821, respectively slidably disposed in the two grooves of the sliding groove 821, and the two magnetic plates 830 are symmetrical about the central axis of the through hole 820 within the sliding groove 821. The two magnetic plates 830 are arranged opposite each other within the sliding groove 821, with their opposing ends magnetically repelling each other, and their opposite ends penetrating through the groove wall of the sliding groove 821.

[0062] The outer cylinder 200 is inserted between the collection cylinder 100 and the drain plate 800, and can slide under the action of the drive mechanism 300. One end of the magnetic plate 830, passing through the corresponding groove 821, abuts against the inner wall of the outer cylinder 200. Two push blocks 210 are fixed on the inner wall of the outer cylinder 200, each corresponding to one of the two magnetic plates 830. The push blocks 210 are configured to push the two magnetic plates 830 closer together as the outer cylinder 200 moves, thereby overcoming the repulsive force between the magnetic plates 830 and closing the through hole 820. During the upward movement of the push blocks 210, as they pass the magnetic plates 830 on adjacent drain plates 800, the through hole 820 on the lower drain plate 800 changes from closed to open, and the through hole 820 on the upper drain plate 800 changes from open to closed.

[0063] More specifically, one end of the magnetic plate 830 extending out of the groove 821 can be a wedge-shaped head, and the upper and lower end faces of the push block 210 can be inclined surfaces adapted to the wedge-shaped head. When the push block 210 moves with the outer cylinder 200, when the push block 210 passes the magnetic plate 830, the inclined surface on the push block 210 can push the wedge-shaped head on the magnetic plate 830, so that the two magnetic plates 830 can move towards each other, thereby closing the through hole 820; when the push block 210 disengages from the contact with the corresponding magnetic plate 830, the magnetic plates 830 move away from each other under the action of magnetic repulsion, thereby opening the through hole 820.

[0064] In this embodiment, when all the through holes 820 on the vent plate 800 are open, the detection cavity is the cavity between the top plate of the outer cylinder 200 and the vent plate 800 that is furthest away from it; when the through holes 820 in the vent plate 800 are closed, the detection cavity is the cavity between the top plate of the outer cylinder 200 and the vent plate 800 that is closest to it and has the through hole 820 closed.

[0065] In addition, an emptying channel 130 is provided inside the collection tube 100. One end of the emptying channel 130 is connected to the circulation channel 520. The connection position between the emptying channel 130 and the circulation channel 520 is close to the fixed groove. The other end of the emptying channel 130 leads to the inner cavity of the collection tube 100 and is connected to the corrugated cylinder 810 between any set of adjacent emptying plates 800 through an emptying pipe. A control valve 530 is installed in the emptying pipe.

[0066] It should be noted that the axial length of the pusher 210 is the sum of the distance between adjacent venting plates 800 and the thickness of the venting plate 800. When the pusher 210 on the outer cylinder 200 abuts against the magnetic plate 830 on the top venting plate 800 and is about to detach from the magnetic plate 830, the gas in the detection chamber is diluted most thoroughly.

[0067] The operating principle of this embodiment is as follows:

[0068] In this embodiment, five venting plates 800 are provided, which are fixed in the inner cavity of the collection tube 100 from top to bottom. The five venting plates 800 are defined as the first venting plate 800, the second venting plate 800, the third venting plate 800, the fourth venting plate 800, and the fifth venting plate 800, and the spacing between two adjacent venting plates 800 is equal.

[0069] It should be clarified that before the gas in the new detection area is detected, the push block 210 on the outer cylinder 200 is abutting against the magnetic plate 830 on the first empty plate 800. The through hole 820 on the first empty plate 800 is closed, while the other empty plates 800 are all open. At this time, the detection cavity is the cavity between the top plate of the outer cylinder 200 and the first empty plate 800.

[0070] In the implementation of this embodiment, firstly, the present invention is placed in a new detection environment, the control valve 530 in the circulation channel 520 is closed, and the air pump 510 and the control valve 530 in the exhaust pipe are turned on. The air pump 510 can extract the gas remaining between the adjacent exhaust plates 800 during the previous detection through the exhaust pipe from the collection cylinder 100. After the air pump 510 has been running for a period of time, the air pump 510 and the control valve 530 in the exhaust pipe are turned off.

[0071] Then, the outer cylinder 200 is controlled by the drive mechanism 300 to descend within the collection cylinder 100. During the descent of the outer cylinder 200, the push block 210 moves accordingly. When the push block 210 moves to the second row of empty plates 800 and abuts against the magnetic plate 830 inside the second row of empty plates 800, the push block 210 disengages from the first row of empty plates 800. At this time, the through hole 820 on the second row of empty plates 800 closes, and the through hole 820 on the first row of empty plates 800 opens. The detection cavity changes to the cavity between the second row of empty plates 800 and the top plate of the outer cylinder 200. Afterward, the push block 210 continues to descend with the outer cylinder 200. When the push block 210 moves to the third row of empty plates 800 and abuts against the magnetic plate 830 inside the third row of empty plates 800, the push block 210 disengages from the second row of empty plates 800. This process continues until the push block 210 moves below the fifth row of empty plates 800.

[0072] When the pusher 210 moves to below the fifth empty plate 800, the through holes 820 on the first to fifth empty plates 800 are all opened. At this time, the detection chamber is the cavity between the top plate of the outer cylinder 200 and the fifth empty plate 800. Then, the control valve 530 in the air pump 510 and the circulation channel 520 is opened. The gas in the detection area can enter the detection chamber in large quantities under the suction action of the air pump 510. Keep the air pump 510 running for a period of time. After the gas in the detection area fills the detection chamber, the concentration of the gas in the detection chamber is detected by the detector 400.

[0073] When the air pump 510 is running, it can transport the original residual gas in the detection chamber and the new gas entering the detection chamber to the outside of the collection tube 100, thereby reducing the residual gas in the detection chamber.

[0074] After the detection is completed, the outer cylinder 200 is driven to rise inside the collection cylinder 100 by the drive mechanism 300. When the outer cylinder 200 rises, it can drive the push block 210 to rise synchronously. When the push block 210 passes the fifth row of empty plates 800, the push block 210 can push the two magnetic plates 830 in the fifth row of empty plates 800 to close, at which time the detection cavity is closed.

[0075] Then, the outer cylinder 200 continues to rise under the action of the drive mechanism 300. When the push block 210 rises to the fourth row of empty plates 800, the push block 210 pushes the corresponding magnetic plate 830 to close. At this time, the detection cavity is changed to the cavity between the top plate of the outer cylinder 200 and the fourth row of empty plates 800.

[0076] Similarly, when the pusher block 210 on the outer cylinder 200 rises to the first empty plate 800, the pusher block 210 pushes the two magnetic plates 830 on the first empty plate 800 to close. At this time, the detection chamber is the cavity between the top plate of the outer cylinder 200 and the first empty plate 800, and the residual gas between the top plate of the outer cylinder 200 and the first empty plate 800 is diluted to the maximum extent.

[0077] In this embodiment, each time the detection cavity changes, the chamber at the bottom of the original detection cavity is replaced by a new chamber added above the first empty plate 800 when the outer cylinder 200 is raised.

[0078] Although the volume of the detection chamber ultimately remains unchanged, most of the gas inside the detection chamber is expelled.

[0079] For example, the gas in the detection chamber includes the gas in the cavity between the top plate of the outer cylinder 200 and the first vent plate 800, and the gas in the cavity between adjacent vent plates 800. After the detection is completed, the outer cylinder 200 is raised. During the raising process, the through holes 820 on multiple vent plates 800 are closed sequentially from bottom to top. When the fourth vent plate 800 is closed, part of the gas in the original detection chamber below the fourth vent plate 800 can be discharged to the new detection chamber. When the through hole 820 on the third vent plate 800 is closed, part of the gas in the original detection chamber below the third vent plate 800 is discharged to the new detection chamber, and so on. This results in the residual gas (gas in the original detection chamber) in the new detection chamber being significantly less than the gas in the original detection chamber.

[0080] Of course, since there is a gap between adjacent venting plates 800, when the detection chamber changes, some gas from the original detection chamber will inevitably enter the new detection chamber. However, compared with the gas from the original detection chamber that is discharged by the new detection chamber, the amount of gas from the original detection chamber entering the new detection chamber is small, which is within the allowable error range of the present invention and has little impact on the gas concentration detected by the present invention.

[0081] In other embodiments, the drain plate 800 includes a fixed drain plate 801 and a movable drain plate 802. The fixed drain plate 801 is provided as one piece, and the movable drain plate 802 is provided as multiple pieces. Both the fixed drain plate 801 and the movable drain plate 802 are located in the inner cavity of the collection tube 100.

[0082] The movable venting plate 802 is slidably disposed in the inner cavity of the collection cylinder 100, and a snap-fit ​​assembly 900 is provided between it and the inner cavity of the collection cylinder 100. In the axial direction of the inner cavity of the collection cylinder 100, multiple movable venting plates 802 are arranged at equal intervals from top to bottom below the fixed venting plate 801 through the snap-fit ​​assembly 900.

[0083] In this embodiment, elastically expandable corrugated cylinders 810 are connected between the fixed vent plate 801 and its adjacent movable vent plate 802, and between adjacent movable vent plates 802. Annular grooves 811 are formed on the opposite sides of the fixed vent plate 801 and its adjacent movable vent plate 802, and on the opposite sides of adjacent movable vent plates 802. The two ends of the corrugated cylinder 810 are respectively fixed to the bottom of the annular grooves 811 on both sides. When adjacent vent plates contact each other, the corrugated cylinder 810 can be compressed into the annular grooves 811.

[0084] Specifically, multiple limiting grooves 140 are formed on the inner wall of the collection cylinder 100. These multiple limiting grooves 140 are divided into two groups, and the two groups of limiting grooves 140 are symmetrically arranged about the central axis of the collection cylinder 100. The limiting grooves 140 have upper limit positions and lower limit positions. The upper limit positions of the multiple limiting grooves 140 are at the same height inside the collection cylinder 100, that is, they are on the same horizontal plane. The lower limit positions of the multiple limiting grooves 140 are arranged in a staggered manner, and the distance between any two adjacent lower limit positions of the same group is equal.

[0085] In the two sets of limiting slides 140, there are multiple pairs of mutually symmetrical limiting slides 140. Multiple movable venting plates 802 correspond to multiple pairs of limiting slides 140 respectively, and can slide along the corresponding pair of limiting slides 140 in the collection cylinder 100. A locking assembly 900 is provided between the corresponding movable venting plates 802 and the limiting slides 140. The locking position of the movable venting plate 802 on the limiting slide 140 is close to the lower limit position of the limiting slide 140.

[0086] To ensure that the movable venting plate 802 can slide along the corresponding pair of limiting slide grooves 140 in the collection cylinder 100, and can be snapped onto the corresponding limiting slide grooves 140 by the snap-fit ​​assembly 900, the outer cylinder 200 has a first limiting slide hole 220 on its side wall. Multiple first limiting slide holes 220 are provided, and the multiple first limiting slide holes 220 correspond to multiple limiting slide grooves 140 respectively. The corresponding first limiting slide holes 220 and limiting slide grooves 140 are interconnected.

[0087] Specifically, the snap-fit ​​assembly 900 includes a snap-fit ​​groove 910 and an elastic snap-fit ​​member 920. The snap-fit ​​groove 910 is located at the bottom of the limiting slide groove 140, near its lower limit position, and is wedge-shaped. The elastic snap-fit ​​member 920 includes a spring and a snap-fit ​​connector. An installation groove is provided on the side wall of the movable vent plate 802. The spring is fixed to the bottom of the installation groove. One end of the snap-fit ​​connector is inserted into the installation groove and fixedly connected to the end of the spring away from the bottom of the installation groove. The end of the snap-fit ​​connector away from the spring is a wedge-shaped head adapted to the snap-fit ​​groove 910. The snap-fit ​​connector extends out of the installation groove and passes through the first limiting slide hole 220, ultimately snapping into the snap-fit ​​groove 910.

[0088] The outer cylinder 200 is equipped with a release assembly 900 that limits the position of the movable venting plate 802 within the collection cylinder 100 and releases the locking relationship between the movable venting plate 802 and the limiting slide groove 140. The release assembly 900 is located below the push block 210 on the outer cylinder 200. When the outer cylinder 200 rises within the collection cylinder 100, the release assembly 230 can drive the movable venting plate 802 to slide along the corresponding limiting slide groove 140. Specifically, the release assembly 230 is a short rod fixed to the two side walls of the first limiting slide hole 220. The short rod is located not only below the push block 210 on the first limiting slide hole 220 but also at the bottom end of the first limiting slide hole 220.

[0089] When the outer cylinder 200 rises, when the lifting rod 230 moves to the locking connector on the movable vent plate 802, the lifting rod 230 can apply an upward force to the locking connector, thereby driving the locking connector to rise. When the locking connector rises, one end of its wedge head will be subjected to a force moving towards the mounting groove, causing the locking connector to compress the spring, thereby causing the locking connector to disengage from the locking groove 910 and releasing the position restriction of the limiting slide groove 140 on the movable vent plate 802. After the lifting rod 230 releases the position restriction of the limiting slide groove 140 on the movable vent plate 802, the locking connector abuts against the bottom of the limiting slide groove 140 under the elastic force of the spring. When the lifting rod 230 rises, the lifting rod 230 can push the locking connector to slide along the limiting slide groove 140, ultimately causing multiple movable vent plates 802 to overlap under the fixed vent plate 801.

[0090] In this embodiment, the collection tube 100 is provided with an emptying channel 130, and a control valve 530 is installed in the emptying channel 130. One end of the emptying channel 130 is connected to the fixed groove, and the other end is connected to the inner cavity of the collection tube 100. The point connected to the inner cavity of the collection tube 100 is located below the multiple movable emptying plates 802 and fixed emptying plates 801 that are stacked together.

[0091] The push block 210 is positioned above the lifting rod 230 on the inner wall of the outer cylinder 200, and the axial distance between them is equal to the sum of the thicknesses of the multiple movable venting plates 802. The length of the push block 210 is greater than or equal to the distance between the lower limit positions of two adjacent limiting slide grooves 140. Furthermore, when the multiple movable venting plates 802 are respectively located at the slots 910 within the corresponding limiting slide grooves 140, the push block 210 is located below the bottommost movable venting plate 802.

[0092] Furthermore, in this invention, the detector 400 requires a certain detection space to detect gas concentration, and the volume of the detection space occupies a suitable proportion within the collection cylinder 100. In this embodiment, when multiple movable venting plates 802 are respectively limited in their corresponding limiting grooves 140, when the detector 400 detects gas, the cavity between the bottommost movable venting plate 802 and the top plate of the outer cylinder 200 serves as the detection cavity. At this time, the through holes 820 on the fixed venting plate 801 and the multiple movable venting plates 802 are all open. After the detector 400 completes the gas detection, the position of the detection cavity can change as the outer cylinder 200 rises.

[0093] The operating principle of this embodiment is as follows:

[0094] First, the present invention is placed in a new detection area. It is assumed that there are four movable venting plates 802, eight limiting slides 140 are provided, and the limiting slides 140 are divided into four pairs. The four pairs of limiting slides 140 correspond to the four movable venting plates 802 respectively. In the initial state, the four movable venting plates 802 are stacked on the fixed venting plate 801.

[0095] Then, the air pump 510 is started and the control valve 530 in the venting channel 130 is opened and the control valve 530 in the circulation channel 520 is closed. The air pump 510 exhausts the cavity located below the movable venting plate 802 in the inner cavity of the collection tube 100 through the venting channel 130, thereby reducing the residual gas in the collection tube 100 when the gas was detected by the present invention the previous time.

[0096] Afterwards, the air pump 510 and the control valve 530 in the venting channel 130 are turned off, and the outer cylinder 200 is moved towards the bottom of the collection cylinder 100 through the drive mechanism 300. During the movement of the outer cylinder 200, the lifting rod 230 on the outer cylinder 200 gradually falls, and the four movable venting plates 802 supported by the lifting rod 230 fall in sequence, so that the four movable venting plates 802 are locked in the corresponding pair of limit sliding grooves 140 from top to bottom. During the fall of the outer cylinder 200, the push block 210 falls synchronously. During the fall of the push block 210, the through holes 820 on the four movable venting plates 802 close and open in sequence. When the push block 210 falls to below the lowest movable venting plate 802, the operation of the drive mechanism 300 is stopped. At this time, the through holes 820 on the four movable venting plates 802 and the through holes 820 on the fixed venting plate 801 are coaxially connected.

[0097] Then, start the air pump 510, open the control valve 530 in the circulation channel 520 and close the control valve 530 in the venting channel 130, so that the gas remaining in the collection tube 100 and the gas in the current detection area are extracted from the collection tube 100.

[0098] Afterwards, the present invention is left to stand for an appropriate amount of time to allow the gas in the current detection area to fill the detection chamber. Then, the detector 400 detects the concentration of the gas. During this process, the gas pump 510 is kept running and the control valve 530 in the circulation channel 520 is kept open.

[0099] Then, the air pump 510 and the control valve 530 in the circulation channel 520 are closed, and the drive mechanism 300 is restarted to raise the outer cylinder 200. During the raising of the outer cylinder 200, the push block 210 can pass through the four movable venting plates 802 in sequence. When the push block 210 passes through two adjacent movable venting plates 802 from bottom to top, the push block 210 must pass through the upper movable venting plate 802 at the same time as it passes through the lower movable venting plate 802, so that the through hole 820 on the lower movable venting plate 802 is opened while the through hole 820 on the upper movable venting plate 802 is closed.

[0100] For example: The four movable venting plates 802 are defined from top to bottom as the first movable venting plate 802, the second movable venting plate 802, the third movable venting plate 802, and the fourth movable venting plate 802. The cavity between the first movable venting plate 802 and the fixed venting plate 801, as well as the cavity between the adjacent movable venting plates 802 below it, are defined from top to bottom as the first cavity, the second cavity, the third cavity, and the fourth cavity. The volumes of the first to fourth cavities are equal.

[0101] As the pusher block 210 rises with the outer cylinder 200, when it reaches the fourth movable vent plate 802, it abuts against the magnetic plate 830 on the fourth movable vent plate 802, at which point the through hole 820 on the fourth movable vent plate 802 closes. When the pusher block 210 passes the fourth movable vent plate 802, the through hole 820 on the fourth movable vent plate 802 opens, and the pusher block 210 will inevitably rise to the third movable vent plate 802, at which point the through hole 820 on the third movable vent plate 802 closes. Consequently, when the pusher block 210 passes the fourth movable vent plate 802 and rises to the third movable vent plate 802, the detection chamber changes from the cavity between the outer cylinder 200 and the fourth movable vent plate 802 to the cavity between the outer cylinder 200 and the third movable vent plate 802. During this process, the volume of the detection chamber remains unchanged, but the detection chamber loses the gas in the fourth cavity, thus effectively diluting the gas within the detection chamber.

[0102] When the pusher block 210 on the outer cylinder 200 moves to the fixed venting plate 801, the pusher block 210 passes through all the movable venting plates 802 and can push the magnetic plate 830 on the fixed venting plate 801 to close. At this time, the detection chamber is the cavity between the outer cylinder 200 and the fixed venting plate 801. The detection chamber loses the gas in the first to fourth cavities, so that the gas in the detection chamber is diluted to the maximum. Under the action of the lifting rod 230, the four movable venting plates 802 are stacked again under the fixed venting plate 801.

[0103] During the rising process of the outer cylinder 200, when the movable vent plate 802 presses against the movable vent plate 802 above it, the gas in the cavity between the two movable vent plates 802 is squeezed out, thus avoiding the gas residue between the movable vent plates 802.

[0104] In addition, during the upward movement of the outer cylinder 200, the control valve 530 and the air pump 510 in the circulation channel 520 can remain open. The opening of the air pump 510 can further reduce the residual gas in the detection chamber, making the detection results more accurate when the present invention detects the concentration of gas in the new area, and greatly reducing the impact of residual gas on gas detection.

[0105] Unlike the embodiments described above, in this embodiment, a built-in cylinder 150 is installed inside the collection cylinder 100. The built-in cylinder 150 is coaxially disposed within the inner cavity of the collection cylinder 100, with its bottom end fixed to the bottom side wall of the collection cylinder 100, and its top end located below the fixed drain plate 801. The built-in cylinder 150 and the collection cylinder 100 are spaced apart, and the outer cylinder 200 is inserted into the annular gap between the built-in cylinder 150 and the inner cavity of the collection cylinder 100.

[0106] The inner cylinder 150 has a second limiting hole 151 corresponding to the limiting groove 140 and the first limiting hole 220. The corresponding first limiting hole 220, second limiting hole 151 and limiting groove 140 are interconnected. Multiple movable venting plates 802 are located in the inner cylinder 150, and the outer side wall of the movable venting plate 802 is in contact with the inner side wall of the inner cylinder 150. At the same time, the snap-fit ​​connector that can pass through the first limiting hole 220 and the limiting groove 140 can also pass through the second limiting hole 151.

[0107] The inner cylinder 150 is also provided with a through slot 152 on its side wall, which corresponds to the push block 210 on the outer cylinder 200. The magnetic plate 830 on the movable venting plate 802 can pass through the through slot 152 and abut against the outer cylinder 200 or the push block 210 on the outer cylinder 200.

[0108] In this embodiment, since the sidewall of the movable venting plate 802 is in contact with the sidewall of the inner cylinder 150, the inner cylinder 150 can prevent the movable venting plate 802 from sliding radially within the collection cylinder 100. This allows the movable venting plate 802 to move more smoothly in this invention, enabling the invention to be applied to more diverse environments and expanding its application scope.

[0109] A method for detecting hazardous gases in the chemical industry, using the aforementioned hazardous gas detection device, has the following specific steps:

[0110] Step 1: Close the detection chamber and start the drive mechanism 300 to move the outer cylinder 200 toward the bottom of the collection cylinder 100. As the outer cylinder 200 moves, the detection chamber gradually shrinks.

[0111] Step 2: Open the detection chamber and activate the gas circulation mechanism to allow gas to enter the detection chamber;

[0112] Step 3: Detector 400 detects the gas inside the detection chamber;

[0113] Step 4: After completing the gas detection, close the detection chamber and drive the outer cylinder 200 to rise inside the collection cylinder 100 via the drive mechanism 300. During this period, the gas circulation mechanism can be kept running.

[0114] Step 5: When the outer cylinder 200 rises to the initial height inside the collection cylinder 100, stop the operation of the drive mechanism 300 and the gas circulation mechanism, and change the position of the collection cylinder 100 and the alarm 11 on the guide rail 10 so that the collection cylinder 100 enters different height positions within the detection area.

[0115] Step 6: Repeat steps 1 to 5 to detect gas at multiple height positions within the detection area.

[0116] The chemical hazardous gas detection method provided by this invention applies the above-mentioned chemical hazardous gas detection device, and the operation steps are simple and clear, enabling the detection of hazardous gas concentrations at multiple heights within different detection areas.

[0117] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A chemical hazardous gas detection device, characterized in that, include: Collection tube; The outer cylinder is slidably disposed in the collection cylinder, and the lower chamber of the top plate of the outer cylinder is configured as a detection chamber that can be opened and closed; The drive mechanism, located inside the collection cylinder, is used to drive the movement of the outer cylinder within the collection cylinder; The detector, installed inside the outer cylinder, is used to detect the gas concentration inside the detection chamber; A gas circulation mechanism is installed inside the collection tube and is configured to maintain the flow of gas in the detection chamber when the detector detects the gas. The gas circulation mechanism includes an air pump and a circulation channel. The air pump is installed on the collection tube and the circulation channel is opened inside the collection tube. One end of the circulation channel is connected to the detection chamber through a pipe, and the other end is connected to the air inlet of the air pump. A control valve is installed inside the circulation channel. The system includes multiple venting plates, which are evenly arranged along the axial direction of the inner cavity of the collection cylinder. The outer cylinder slides between the venting plates and the collection cylinder. The venting plates have through holes with opening and closing functions. The outer cylinder has push blocks for controlling the opening and closing of the through holes. The push blocks are configured such that, during the upward movement of the push blocks, when passing two adjacent venting plates, the through holes on the lower venting plate change from closed to open, and the through holes on the upper venting plate change from open to closed. The bottom of the collection tube has a gas collection chamber located on one side of the detection chamber. The collection tube has an outlet air passage, the two ends of which are connected to the gas collection chamber and the outlet of the air pump, respectively. A control valve is installed in the outlet air passage. A dustproof net that can be covered at the opening of the tube is installed at the bottom of the collection tube. The collection tube has an air venting channel. One end of the air venting channel is connected to the air inlet of the air pump, and the other end is connected to the cavity between the adjacent air venting plates through a pipe.

2. The chemical hazardous gas detection device according to claim 1, characterized in that: The venting plate includes a fixed venting plate and a movable venting plate, with the fixed venting plate fixed inside the collection tube; Multiple movable venting plates are provided. The movable venting plates are slidably set in the inner cavity of the collection tube and are connected to the inner cavity of the collection tube by a snap-fit ​​assembly. In the axial direction of the inner cavity of the collection tube, the multiple movable venting plates are arranged at equal intervals from top to bottom below the fixed venting plate through the snap-fit ​​assembly.

3. The chemical hazardous gas detection device according to claim 2, characterized in that: The snap-fit ​​assembly includes a slot and an elastic snap-fit ​​component. The slot is formed in the collection tube, and the elastic snap-fit ​​component is disposed on the movable venting plate to snap the movable venting plate into the slot.

4. A chemical hazardous gas detection device according to claim 3, characterized in that: The bottom end of the outer cylinder is provided with a lifting rod, which is used to release the restriction of the position of the movable venting plate in the collection cylinder by the locking assembly, and can cooperate with the elastic locking member to drive the movable venting plate to rise.

5. A chemical hazardous gas detection device according to claim 1, characterized in that: The bottom of the collection tube is equipped with a diffusion unit, which includes a diffusion fan and a belt drive assembly. The diffusion fan is installed at the bottom opening of the collection tube to diffuse external air into the collection tube, and the belt drive assembly drives the diffusion fan to rotate.

6. A method for detecting hazardous gases in chemical industries, characterized in that: The chemical hazardous gas detection device according to any one of claims 1-5 was used.

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