A dangerous gas detector

Abstract

The present invention provides a hazardous gas detector, comprising a base plate, a sensitive element compartment, an airtight shading member, an element sensor assembly, and a transmission mechanism, a shifting mechanism, an air pump, and a main control board fixed to the base plate. The airtight shading member is plugged into the end of the sensitive element compartment and is connected to the sensitive element in the sensitive element compartment. The element sensor assembly is plugged into the top of the sensitive element compartment. The operation of the transmission mechanism enables the assembly and disassembly of the airtight shading member, the element sensor assembly, and the sensitive element compartment; the operation of the shifting mechanism enables the sensitive element compartment to move a predetermined distance in a predetermined direction. The present invention utilizes a transmission mechanism to achieve assembly and disassembly of the sensitive element and utilizes a shifting mechanism to achieve displacement and replacement of the sensitive element. The combination of the two completes the automatic replacement of the sensitive element, greatly reducing the frequency of disassembly and improving the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of dangerous substance detection, and in particular to a dangerous gas detector. Background Art

[0002] In existing technology, explosives, toxic gases and other dangerous gas detection instruments all use a quartz glass tube coated with oil-fluorescent sensitive material (referred to as the sensitive element). Due to its short service life, it often needs to be replaced every few days. For users, frequent replacement of sensitive elements leads to a poor user experience of the instrument, which is extremely inconvenient. In addition, the removal of sensitive elements from equipment currently on the market often requires the entire machine to be disassembled, and then the sensitive elements are removed. Frequent replacement of sensitive elements causes frequent disassembly and assembly of the entire machine, which will cause deviations in the installation accuracy of the equipment and affect the reliability of the equipment's detection results. Summary of the Invention

[0003] The present invention aims to solve the above-described problems. One object of the present invention is to provide a dangerous gas detector that solves the above-described problems. Specifically, the present invention provides a dangerous gas detector that can automatically and accurately replace sensitive components.

[0004] In order to solve the above technical problems, the present invention provides a hazardous gas detector, which includes a base plate, a sensitive element warehouse, an airtight shading member, an element sensor assembly, and a transmission mechanism, a shifting mechanism, an air pump and a main control board fixed on the base plate, wherein the airtight shading member is plugged into the end of the sensitive element warehouse and is connected to the sensitive element in the sensitive element warehouse, the element sensor assembly is plugged into the top of the sensitive element warehouse, the airtight shading member and the element sensor assembly are both fixedly connected to the transmission mechanism, and the operation of the transmission mechanism realizes the disassembly and assembly of the airtight shading member, the element sensor assembly and the sensitive element warehouse; the sensitive element warehouse is connected to the shifting mechanism, and the operation of the shifting mechanism realizes the movement of the sensitive element warehouse along a predetermined direction and a predetermined stroke; the airtight shading member is connected to the air pump, and the air pump and the element sensor assembly are evenly electrically connected to the main control board.

[0005] The sensitive element compartment includes N unit compartments arranged side by side and at equal intervals, and one sensitive element is arranged in each unit compartment, wherein N is an integer greater than or equal to 2.

[0006] Wherein, the hazardous gas detector further includes a driving plate, and the transmission mechanism and the shifting mechanism are both electrically connected to the driving plate.

[0007] In which, the transmission mechanism includes a transmission motor, a lead screw, a first slide rail, a connecting plate, a transmission rod and a curved transmission member, wherein the transmission motor is connected to the lead screw transmission, the connecting plate is connected to the lead screw transmission and is slidingly connected to the first slide rail, the transmission rod is fixedly connected to the connecting plate and is slidingly connected to the curved surface of the curved transmission member; the connecting plate is fixedly connected to the airtight shading member, and the curved transmission member is fixedly connected to the element sensor assembly.

[0008] Wherein, the transmission mechanism further includes a first position sensor and a second position sensor which are arranged at intervals along the extending direction of the lead screw.

[0009] Wherein, the transmission mechanism further includes a nut and a first slider, the nut is transmission-connected to the lead screw, the first slider is slidingly connected to the first slide rail, and the connecting plate is fixedly connected to the nut and the first slider.

[0010] The shift mechanism includes a shift motor, a base and a second slide rail, wherein the shift motor is transmission-connected to the base, the base is slidingly connected to the second slide rail, and the sensitive element is connected to the base.

[0011] The shifting mechanism further includes a rack and a driving wheel. The driving wheel is fixedly connected to the output end of the shifting motor and meshes with the rack for transmission. The rack is fixedly connected to the base.

[0012] Wherein, the shift mechanism further includes a third position sensor and a fourth position sensor which are arranged at intervals along the extension direction of the second slide rail.

[0013] Wherein, the hazardous gas detector further includes a shell, the shell is fixedly connected to the base plate, and the shell is provided with a channel above the second slide rail.

[0014] The hazardous gas detector provided by the present invention adopts a sensitive element compartment in which multiple sensitive elements are installed at equal intervals. The transmission mechanism is used to realize the disassembly and assembly of the sensitive elements, and the shift mechanism is used to realize the shift and replacement of the sensitive elements. The combination of the two completes the automatic replacement of the sensitive elements, greatly reduces the frequency of disassembly, ensures the installation accuracy and air tightness of the whole machine, ensures the reliability of the detection results, and improves the user experience.

[0015] Other characteristic features and advantages of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In the drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all. It is clear that those skilled in the art can derive other drawings from these drawings without inventive effort.

[0017] Figure 1 The structural diagram of the dangerous gas detector of the present invention is exemplarily shown;

[0018] Figure 2 The exploded structural diagram of the hazardous gas detector of the present invention is exemplarily shown;

[0019] Figure 3 The schematic diagram of the gas flow in the hazardous gas detector of the present invention is shown as an example;

[0020] Figure 4 The structural diagram of the curved transmission member is shown as an example;

[0021] Figure 5 A structural diagram of a dangerous gas detector of the present invention is exemplarily shown;

[0022] Figure 6 The structural diagram of a shell of the hazardous gas detector of the present invention is exemplarily shown. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other in any way.

[0024] The hazardous gas detector of the present invention utilizes a sensitive element bin that can simultaneously mount multiple sensitive elements spaced at equal intervals, utilizes a transmission mechanism to achieve assembly and disassembly of the sensitive elements, utilizes a shift mechanism to achieve displacement and replacement of the sensitive elements, and utilizes a drive plate to control the automatic operation of the transmission mechanism and the shift mechanism, thereby achieving automatic replacement of the sensitive elements. Specifically, a transmission motor drives the connecting plate and a transmission rod fixed to the connecting plate to move via a lead screw and a first slider, thereby driving the removal or installation of the airtight light shielding member via the connecting plate, and simultaneously driving the removal or installation of the element sensor assembly via the transmission between the transmission rod and the curved transmission member. The shift motor then drives the base to shift the sensitive element bin, thereby achieving replacement of the sensitive element.

[0025] The hazardous gas detector provided according to the present invention is described in detail below with reference to the accompanying drawings.

[0026] Figure 1 A schematic diagram of the internal structure of a specific embodiment of the hazardous gas detector of the present invention is shown. Figure 2 This is a schematic diagram of the decomposition of the hazardous gas detector. Figure 3 Shows a gas flow diagram in the hazardous gas detector, with comprehensive reference to Figures 1 to 3 As shown, the hazardous gas detector includes a base plate 10, a sensitive element compartment 2, an airtight shading member 3, an element sensor assembly 4, and a transmission mechanism 5, a shifting mechanism 6, an air pump 7, and a main control board 11 fixed to the base plate 10. A sensitive element 20 used for detecting the gas path is installed in the sensitive element compartment 2. The detector is also equipped with an air inlet 71 and an air outlet 72. Under the operation of the air pump 7, the gas to be tested enters the sensitive element 20 through the air inlet 71, and the gas after the test is completed is discharged through the air pump 7 and the air outlet 72. Among them, the outlet and inlet of the sensitive element 20 are both connected to the airtight shading member 3, and the airtight shading member 3 ensures that external light will not enter the sensitive element 20 to affect the detection, and ensures the airtightness of the connection of the sensitive element 20. Specifically, the airtight light shielding member 3 is connected to the air pump 7. A first air path connector 73 is provided between the airtight light shielding member 3 located at the inlet end of the sensitive element 20 and the air inlet 71. A second air path connector 74 is provided between the airtight light shielding member 3 located at the outlet end of the sensitive element 20 and the air inlet end of the air pump 7. The air outlet end of the air pump 7 is connected to the air outlet 72. When the air pump 7 is started to pump gas, the gas to be tested enters the hazardous gas detector through the air inlet 71, then passes through the first air path connector 73, the sensitive element 20, the second air path connector 74, the air pump 7, and the air outlet 72 in sequence before being discharged.

[0027] The element sensor assembly 4 and the main control board 11 are used as the main detection components and result analysis components to detect, identify and analyze the gas to be tested in the sensitive element 20. A specific light source assembly (not shown in the figure) is installed below the sensitive element 20 to provide a specific light beam for detecting the substance to be tested in the sensitive element 20. During operation, after the air pump 7 is started, the specific light source assembly is turned on. The specific light beam provided by the specific light source assembly passes through the light beam processing system or filter below the sensitive element 20 and irradiates the inside of the sensitive element 20. After exciting and irradiating the gas to be tested, it sequentially passes through the sensitive element 20 and the light or signal processing components such as the filter above the sensitive element 20, and is then received by the element sensor assembly 4, and then identified and analyzed. The main control board 11 processes the results.

[0028] The air pump 7 and the element sensor assembly 4 are both electrically connected to the main control board 11, which controls the start and stop of the air pump 7, thereby controlling whether the hazardous gas detector operates. The specific light source assembly is also electrically connected to the main control board 11, which controls its on and off. The transmission mechanism 5 and shifting mechanism 6 are used to remove, relocate, and install the sensitive element 20, thereby enabling automatic replacement of the sensitive element 20.

[0029] In the hazardous gas detector of the present invention, to facilitate automatic removal and installation of the sensitive element 20, the airtight light shielding member 3 is plugged into the end of the sensitive element compartment 2 and communicates with the sensitive element 20 within the compartment. The element sensor assembly 4 is plugged into the top of the compartment 2. Furthermore, the airtight light shielding member 3 and the element sensor assembly 4 are fixedly connected to a transmission mechanism 5. The operation of the transmission mechanism 5 allows the airtight light shielding member 3 and the element sensor assembly 4 to be removed from or inserted into the sensitive element compartment 2.

[0030] The sensitive element compartment 2 moves with the shift mechanism 6. Therefore, the sensitive element compartment 2 is connected to the shift mechanism 6. This connection can be fixed or elastically snapped together for easy assembly and disassembly. The operation of the shift mechanism 6 allows the sensitive element compartment 2 to move in a predetermined direction and along a predetermined distance, thereby enabling the displacement and replacement of the sensitive element 20. This effectively reduces the number of times the device needs to be disassembled simply to replace the sensitive element 20, improving the user experience while ensuring the installation accuracy of the detector.

[0031] In order to further reduce the number of times the detector is disassembled and assembled, in a typical embodiment of the present invention, the sensitive element compartment 2 includes N unit compartments 21 arranged side by side and at equal intervals, and a sensitive element 20 is arranged in each unit compartment 21, where N is an integer greater than or equal to 2. At this time, compared with the existing detector, each time the sensitive element is replaced, the dangerous gas detector disclosed in the present invention can be disassembled and replaced at least once after using N sensitive elements. Compared with the detector under the prior art, when the same N sensitive elements are used, N-1 fewer disassembly times can be performed, which greatly reduces the frequency of manual disassembly and assembly, improves user experience, and ensures the installation accuracy of the instrument and its components. In the embodiment shown in the figure, N is 5, that is, each time the device is disassembled and assembled, 5 sensitive elements 20 can be replaced at the same time, and the usage time or number of detections after each disassembly and assembly is at least 5 times the usage time or number of detections of the existing device.

[0032] To improve the automation level of sensitive element replacement in the hazardous gas detector, the device also includes a drive board 8. Both the transmission mechanism 5 and the shift mechanism 6 are electrically connected to the drive board 8. The drive board 8 controls the orderly operation of the transmission mechanism 5 and the shift mechanism 6 according to preset programs and parameters, enabling automatic replacement of the sensitive element 20 while ensuring the accuracy and airtightness of replacement and installation, thereby guaranteeing the reliability of the test results. Specifically, the drive board 8 can control the start and stop of the transmission mechanism 5 and the shift mechanism 6, as well as their operating direction, operating speed, and the duration or stroke of each operation.

[0033] In the illustrated embodiment, the transmission mechanism 5 includes a transmission motor 51, a lead screw 52, a first slide rail 53, a connecting plate 54, a transmission rod 55 and a curved transmission member 56, wherein the transmission motor 51 is transmission-connected to the lead screw 52, the first slide rail 53 is arranged parallel to the lead screw 52, the connecting plate 54 is transmission-connected to the lead screw 52 and is slidingly connected to the first slide rail 53, the transmission rod 55 is fixedly connected to the connecting plate 54 and is slidingly connected to the curved surface 560 of the curved transmission member 56; the connecting plate 54 is fixedly connected to the airtight shading member 3, and the curved transmission member 56 is fixedly connected to the element sensor assembly 4.

[0034] Figure 4 A schematic structural diagram of a specific embodiment of the curved transmission member 56 is shown. Figure 3A back structure of the curved surface structural member 56 in the embodiment. When the transmission motor 51 drives the lead screw 52 to rotate, the connecting plate 54 moves along the first slide rail 53 as the lead screw 52 rotates, driving the airtight light shielding member 3 to be separated from or plugged into the sensitive element 20 for installation. At the same time, the transmission rod 55 slides along the curved surface 560 of the curved transmission member 56 as the connecting plate 54 moves, and the position of the curved transmission member 56 changes as the curved surface 560 changes, thereby driving the position of the element sensor assembly 4 to change. Specifically, the two ends of the curved surface 560 of the curved transmission member 56 have a preset height difference, and this height difference is greater than the installation depth between the element sensor assembly 4 and the sensitive element 20, that is, the shape and middle change of the curved surface 560 can be any structure or change trend. It is only necessary to ensure that the height difference between the two extreme positions where the transmission rod 55 contacts the curved surface 560 meets the installation and disassembly requirements of the element sensor group 4.

[0035] The transmission motor 51 is electrically connected to the drive plate 8, and the drive plate 8 controls the operation of the transmission mechanism 6 by controlling the start and stop, running direction, speed, and stroke of the transmission motor 51. When removing or installing the sensitive element 20, the drive plate 8 drives the transmission motor 51 to start, and then the transmission motor 51 drives the lead screw 52 to rotate, thereby driving the connecting plate 54 to slide along the first slide rail 53. Driven by the connecting plate 54, the airtight light shielding member 3 is separated from the sensitive element 20 to be replaced or plugged into the replaced sensitive element 20. At the same time, the transmission rod 55 moves with the movement of the connecting plate 54, and driven by the curved surface 560 of the curved transmission member 56, it drives the curved transmission member 56 to rise or fall, and then drives the element sensor assembly 4 to separate from the sensitive element 20 to be replaced or connect with the replaced sensitive element 20, thereby realizing the automation of the removal or installation of the sensitive element 20 and avoiding damage to the device or installation errors caused by manual operation.

[0036] Furthermore, the transmission mechanism 5 also includes a first position sensor 501 and a second position sensor 502 spaced apart along the extension direction of the lead screw 52, for detecting the position of the connecting plate 54 to monitor whether the airtight light shielding member 3, the element sensor assembly 4, and the sensitive element 20 are completely removed or installed. The first position sensor 501 is used to detect the position of the connecting plate 54 when the sensitive element 20, the airtight light shielding member 3, and the element sensor assembly 4 are completely installed, while the second position sensor 502 is used to detect the position of the connecting plate 54 when the sensitive element 20, the airtight light shielding member 3, and the element sensor assembly 4 are completely disconnected.

[0037] In this embodiment, the transmission mechanism 5 further includes a nut 57 and a first slider 58. The nut 57 is in transmission connection with the lead screw 52, the first slider 58 is in sliding connection with the first slide rail 53, and the connecting plate 54 is fixedly connected to both the nut 57 and the first slider 58 to enable the connecting plate 54 to slide along the first slide rail 53 under the drive of the lead screw 52.

[0038] like Figures 1 to 3 As shown, in this embodiment, the inlet and outlet ends of the sensitive element 20 are not on the same side. Therefore, airtight shielding members 3 are provided at both ends of the sensitive element 20, one of which is an airtight shielding member at the air inlet end, and the other is an airtight shielding member at the air outlet end. Accordingly, the transmission mechanism 5 is provided with two connecting plates 54, each connected to the two airtight shielding members 3. Two first sliders 58 are provided on the first slide rail 53, and a nut 57 is provided at each end of the lead screw 52. Because the two connecting plates 54 drive the two airtight shielding members 3 to move the same distance, and both move synchronously and in opposite directions under the rotation of the lead screw 52, the lead screw 52 in this embodiment is a bidirectional lead screw, and it is sufficient to monitor the position of only one of the sliders 58, the nut 57, or the connecting plate 54. In this embodiment, the first position sensor 501 is located at a position corresponding to the first end of the nut 57 when the sensitive element 20 and the airtight light shielding member 3 are fully installed. The second position sensor 502 is located at a position corresponding to the first end of the nut 57 when the sensitive element 20 and the airtight light shielding member 3 are fully disengaged. During disassembly, the drive board 8 controls the transmission motor 51 to start forward or reverse rotation, driving the lead screw 52. When the second position sensor 502 detects an edge signal from the first end of the nut 57, indicating that both the airtight light shielding member 3 and the element sensor assembly 4 are fully disengaged from the sensitive element 20, the second position sensor 502 sends a confirmation signal to the drive board 8. Upon receiving this confirmation signal, the drive board 8 controls the transmission motor 51 to stop. During installation, the drive board 8 controls the transmission motor 51 to start in reverse or forward rotation and drives the lead screw 52 to rotate in the opposite direction relative to the disassembly process. When the first position sensor 501 detects the first end edge signal of the nut 57, the airtight shading member 3 and the element sensor assembly 4 are completely installed with the sensitive element 20. The first position sensor 501 sends a stop signal to the drive board 8. After receiving the stop signal, the drive board 8 controls the transmission motor 51 to stop running.

[0039] In other embodiments, if the inlet and outlet ends of the sensitive element 20 are on the same side, that is, the same airtight light-shielding member 3 simultaneously performs airtight light-shielding sealing on the inlet and outlet ends of the sensitive element 20, only one connecting plate 54, a first slider 58 and a nut 57 are required. At this time, the screw 52 can still be a bidirectional screw as shown in the figure, or a unidirectional screw can be used.

[0040] It should be noted that the transmission motor 51 can drive the lead screw 52 (one-way lead screw or two-way lead screw) to operate by any feasible method such as gear meshing transmission, chain transmission, or belt transmission. In the illustrated embodiment, a belt transmission method is adopted. Specifically, the output end of the transmission motor 51 is provided with a driving wheel 511, and a driven wheel 512 is provided at one end of the lead screw 52. The driving wheel 511 and the driven wheel 512 are connected to each other by a belt 513.

[0041] The shift mechanism 6 is primarily used to move the sensor compartment 2 in a predetermined direction and a predetermined distance under specific circumstances, under the control of the drive plate 8, according to a preset program. After the transmission mechanism 5 removes the used sensor 20 to be replaced, the shift mechanism 5 moves the sensor compartment 2 to remove the sensor 20 to be replaced from the installation position and moves the target sensor 20 to the installation position.

[0042] As shown in the figure, the shift mechanism 6 includes a shift motor 61, a base 62, and a second slide rail 63. The shift motor 61 is in transmission connection with the base 62, the base 62 is in sliding connection with the second slide rail 63, and the sensitive element 20 is connected to the base 62. The shift motor 61 is electrically connected to the drive plate 8, and the drive plate 8 controls the shift mechanism 6 by controlling the start and stop, running direction, running speed, duration or stroke of the shift motor 61. When the shift motor 61 is started, it drives the base 62 to move along the second slide rail 63, and then drives the sensitive element compartment 2 to move along the second slide rail 63, thereby shifting and replacing the sensitive element 20. The extension direction of the second slide rail 63 is perpendicular to the extension direction of the first slide rail 53.

[0043] There are various ways for the shift motor 61 to drive the base 62 to move along the second slide rail 63. In this embodiment, a gear and rack meshing method is used. As shown in the figure, the shift mechanism 6 also includes a rack 64 and a drive wheel 65. The drive wheel 65 is fixedly connected to the output end of the shift motor 61 and meshes with the rack 64 for transmission. The rack 64 is fixedly connected to the base 62. When the shift motor 61 is started, the drive wheel 65 rotates with the forward or reverse rotation of the shift motor 61, driving the rack 64 to move. The rack 64 drives the base 62 to move along the second slide rail 33, thereby achieving the movement of the sensitive element compartment 2 along the second slide rail 63, that is, achieving the displacement of the sensitive element 20.

[0044] In the illustrated embodiment, five sensitive elements 20 are evenly spaced within the sensitive element compartment 2, which is connected to a base 62. During component replacement, each time the drive plate 8 activates the shift motor 61, the base 62 drives the sensitive element compartment 2 to move a distance equal to the centerline spacing between adjacent sensitive elements 20, enabling precise displacement and replacement of the sensitive elements 20.

[0045] The process of automatically replacing the sensitive element 20 of the dangerous gas detector in this scheme is as follows: the transmission motor 51 is started by the driving plate 8, and the connecting plate 54 is driven to move along the first slide rail 53 by the lead screw 52, and then the airtight light shielding member 3 is driven by the connecting plate 54 to separate from the sensitive element 20, and at the same time, the curved transmission member 56 is driven by the transmission rod 55 to drive the element sensor assembly 4 to separate from the sensitive element 20. After the driving plate 8 receives the signal from the second position sensor 502, the transmission motor 51 is controlled to stop, and the sensitive element 20 is disassembled; then the driving plate 8 starts the shift motor 61, drives the rack 34 to drive the base 62 to move along the second slide rail 63, and stops after running for a predetermined time or stroke, and the original The original sensitive element 20 is moved out of the installation position, and the newly replaced sensitive element 20 is moved to the installation position; then the driving board 8 controls the transmission motor 51 to start again (running in the opposite direction to that during disassembly), and drives the connecting plate 54 along the first slide rail 53 to restore to its original position through the screw 52, and then the connecting plate 54 drives the airtight shading member 3 to be plugged into the sensitive element 20, and the transmission rod 55 drives the curved transmission member 56 to drive the element sensor assembly 4 to restore to the installation position. When the driving board 8 receives the signal from the first position sensor 501, it indicates that the installation is complete, and the driving board 8 controls the transmission motor 51 to stop. At this point, the fully automatic replacement of the sensitive element 20 is completed, and there is no need for manual disassembly and assembly of the detector.

[0046] In order to clearly know whether the multiple sensitive elements 20 in the sensitive element warehouse 2 have been replaced, the shift mechanism 6 in this scheme also includes a third position sensor 601 and a fourth position sensor 602 arranged at intervals along the extension direction of the second slide rail 63, which are used to directly or indirectly detect the position of the sensitive element warehouse 2 (or sensitive element 20), and the third position sensor 601 and the fourth position sensor 602 are both electrically connected to the drive plate 8, and their detection results are fed back to the drive plate 8 in real time.

[0047] exist Figures 1 to 3 In the illustrated embodiment, both the third position sensor 601 and the fourth position sensor 602 determine the position of the sensitive element compartment 2 or the sensitive element 20 by detecting the position of the base 62. The third position sensor 601 is located at a position corresponding to the position of the first end of the base 62 at one end of the sensitive element compartment 2 (the first sensitive element 20 along the replacement direction) when in use. The fourth position sensor 602 is located at a position corresponding to the position of the first end of the base 62 at the other end of the sensitive element compartment 2 (the last sensitive element 20 along the replacement direction) when in use, or at a position corresponding to the position of the first end of the base 62 at the other end of the sensitive element compartment 2 (the last sensitive element 20) after removal after use and a predetermined displacement along the original replacement direction, or at a position corresponding to the extreme position of the base 62 along the second slide rail 63 within the detector (without impacting or damaging other components).

[0048] One detection process can be as follows: after the sensitive element compartment 2 is replaced and the sensitive element compartment 2 is installed in place (the first sensitive element 20 along the replacement direction is in the installation and use position), the third position sensor 601 is triggered. After the drive board 8 receives the signal from the third position sensor 601, it is considered that the device can be used normally. When the last sensitive element 20 in the replacement direction of the sensitive element compartment 2 is replaced or the last sensitive element 20 is used, removed, and shifted, the fourth position sensor 602 is triggered. After the drive board 8 receives the signal from the fourth position sensor 602, it is considered that the sensitive element compartment 2 or all the sensitive elements 20 in the sensitive element compartment 2 need to be disassembled and replaced, and then the user is notified to perform the corresponding operation.

[0049] In another typical embodiment, the shift motor 61 can be a stepper motor or a servo motor equipped with an encoder. The position of the third position sensor 601 is the initial zero position at which the shift mechanism 6 moves the sensitive element compartment 2 when the first sensitive element 20 in the sensitive element compartment 2 is replaced. The drive board 8 controls the operation of the shift motor 61. After receiving the signal from the third position sensor 601, the drive board 8 begins calculating the travel distance of the base 62 driven by the shift motor 61, using this initial zero position as the initial zero position. For example, if calculation shows that the operating time of the shift motor 61 is 1000 pulses when the shift motor 61 drives the base 62 to travel the distance equal to the center distance between two adjacent sensitive elements 20, the drive board 8 controls the shift motor 61 to stop after calculating 1000 pulses after receiving the signal from the third position sensor 601. At this point, it is assumed that the used sensitive element 20 has been removed and the new sensitive element 20 to be replaced is exactly in the installation position.

[0050] The fourth position sensor 602 can play a protective role and can be set at a position corresponding to the farthest end of the shift mechanism 6 or the position corresponding to the extreme position of the base 62 moving along the second slide rail 63 within the detector (without impacting and damaging other components), for example, the position corresponding to the end of the second slide rail 63. When an error occurs during program operation and the shift motor 61 drives the base 62 to continue moving, to prevent the base 62 from moving out of the second slide rail 63 and impacting other components, causing damage to the detector, when the fourth position sensor 602 detects the edge of the base 62, it sends a reset signal to the drive board 8, and the shift program in the drive board 8 is automatically reset, controlling the shift motor 61 to move in the opposite direction to the initial position.

[0051] Correspondingly, the shifting mechanism 6 may also include an alarm unit (not shown in the figure), which may be an indicator light and / or a buzzer, etc. When the driving board 8 receives the signal from the fourth position sensor 602, the alarm unit is triggered to notify the user to perform the operation of replacing the sensitive element compartment 2.

[0052] Since the gas in the sensitive element 20 is greatly affected by light, in order to prevent external light from entering the sensitive element 20 and affecting the reliability of the detection results, the hazardous gas detector also includes a light-shielding seat 9 fixed on the base plate 10. In the working state, the sensitive element compartment 2 is located in the light-shielding seat 9 or the sensitive elements 20 in use and unused in the sensitive element compartment 2 are all located in the light-shielding seat 9.

[0053] In order to further reduce the disassembly operation for replacing the sensitive element, a transmission channel can be opened at the corresponding shell position of the sensitive element compartment 2. Figure 5 A schematic structural diagram of a dangerous gas detector with a housing is shown in the figure. Figure 6 The schematic diagram of the structure of the housing is shown. Figure 5 and Figure 6 As shown, in this embodiment, the hazardous gas detector further includes a housing 12. When installed and in use, the housing 12 covers the sensitive element compartment 2, the airtight light shielding member 3, the element sensor assembly 4, the transmission mechanism 5, the shift mechanism 6, the air pump 7, and other structures, and is fixedly connected to the base plate 10. A channel 121 is provided on the housing 12 at a position corresponding to the position above the second slide rail 63 to ensure the normal sliding of the base 62 on the second slide rail 63. Specifically, the width of the channel 121 is greater than the sum of the width of the base 62 and the width of the rack 64 to ensure that the normal operation of the base 62 is not hindered.

[0054] It should be noted that, if the plane of the housing 12 where the passage 121 is located is defined as the first surface, the height of the first surface is lower than the top surface of the base 62 to prevent collision between the housing 12 and the sensitive element compartment 2. Furthermore, a notch 122 is provided on the second surface of the housing 12, adjacent to and perpendicular to the first surface, to serve as a passage for the sensitive element compartment 2. Therefore, the width of the notch 122 is greater than the width of the sensitive element compartment 2, and the height of the notch 122 is greater than the height of the sensitive element compartment 2, and partially higher than the height of the positioning member of the sensitive element compartment 2.

[0055] As the sensitive elements 20 in the sensitive element compartment 2 are used and replaced one after another, the sensitive element compartment 2 moves along the second slide rail 63 under the transmission of the shift mechanism 6 and passes through the slot 122. After all the sensitive elements 20 in the sensitive element compartment 2 have been used, the sensitive element compartment 2 is completely passed through the slot 122 under the transmission of the shift mechanism 6 and exposed above the first surface of the housing 12. At this point, all the sensitive elements 20 in the sensitive element compartment 2 can be directly replaced, or the sensitive element compartment 2 with the sensitive elements 20 installed can be directly replaced without disassembling the housing 12 or any other structures or components.

[0056] In order to facilitate assembly and replacement, the sensitive element compartment 2 and the base 62 can be connected by elastic snap-fit or fixed connection for easy disassembly. In this embodiment, the sensitive element compartment 2 and the base 62 are elastically snap-fitted. Figure 2 and Figure 5 As shown, a blocking block 621 is provided at the first end of the base 62 (corresponding to the end of the sensitive element compartment 2 on the inner side relative to the shell 12), which is used to limit and support the sensitive element compartment 2; an elastic member 622 and a slide groove 623 are provided at the second end of the base 62, and a card slot is provided on the side of the elastic member 622 facing the blocking block 621. The height of the card slot above the top surface of the base 62 is equal to the height of the sensitive element compartment 2, and is used to be connected with the sensitive element compartment 2 to limit the sensitive element compartment 2 in the longitudinal direction; at the same time, the elastic structure of the elastic member 622 and the sliding in the slide groove 623 are utilized to facilitate the disassembly and assembly of the sensitive element compartment 2.

[0057] Specifically, the elastic member 622 includes a fixing member 622a fixed to the second end of the base, a spring 622b, and a clamping member 622c located within the slide slot 623. A mounting shaft parallel to the second slide rail 63 is provided on the side of the fixing member 622a facing the blocking block 621. The spring 622b is sleeved on the mounting shaft, and the clamping member 622c is also sleeved on one end of the mounting shaft. For example, a mounting hole is provided on the side of the clamping member 622c facing away from the slot. The mounting shaft is located within the mounting hole, and the depth of the mounting hole is greater than the depth of the slot. Then, by moving the clamping member 622c along the slide groove 623, the installation shaft is made to penetrate into the installation hole, compressing the spring 622b, so that the clamping member 622c is separated from the sensitive element chamber 2, and the disassembly of the sensitive element chamber 2 is completed; and the clamping member 622c is released, and under the action of the elastic restoring force of the spring 622b, the clamping member 622c is pushed to slide along the slide groove 623 toward the blocking block 621, and then is clamped and fixed with the sensitive element chamber 2, thereby completing the installation of the sensitive element chamber 2.

[0058] Furthermore, in order to avoid installation errors of the sensitive element bin 2 in the plane perpendicular to the second slide rail 63, limiting grooves adapted to the blocking block 621 and / or the clamping member 622c can be provided at the ends (one end or both ends) of the sensitive element bin 2 for clamping and limiting with the blocking block 621 and / or the clamping member 622c.

[0059] The contents described above can be implemented individually or in combination in various ways, and these variations are all within the protection scope of the present invention.

[0060] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0061] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments, or that some of the technical features may be replaced with equivalents; such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A dangerous gas detector, characterized in that: The hazardous gas detector comprises a base plate (10), a sensitive element chamber (2), an airtight shading member (3), an element sensor assembly (4), a transmission mechanism (5), a shift mechanism (6), an air pump (7), and a main control board (11) fixed on the base plate (10), wherein the airtight shading member (3) is plugged into the end of the sensitive element chamber (2) and is connected to the sensitive element (20) in the sensitive element chamber (2), the element sensor assembly (4) is plugged into the top of the sensitive element chamber (2), the airtight shading member (3) and the element sensor assembly (4) are both fixedly connected to the transmission mechanism (5), and the operation of the transmission mechanism (5) realizes the disassembly and assembly of the airtight shading member (3), the element sensor assembly (4), and the sensitive element chamber (2); The sensitive element bin (2) is connected to the shift mechanism (6), and the shift mechanism (6) operates to enable the sensitive element bin (2) to move along a predetermined direction and a predetermined stroke; The airtight light shielding member (3) is in communication with the air pump (7), and the air pump (7) and the element sensor assembly (4) are electrically connected to the main control board (11); The transmission mechanism (5) comprises: a transmission motor (51), a lead screw (52), a first slide rail (53), a connecting plate (54), a transmission rod (55) and a curved transmission member (56), wherein the transmission motor (51) is transmission-connected to the lead screw (52), the connecting plate (54) is transmission-connected to the lead screw (52) and is slidably connected to the first slide rail (53), and the transmission rod (55) is fixedly connected to the connecting plate (54) and is slidably connected to the curved surface (560) of the curved transmission member (56); When the transmission motor (51) drives the lead screw (52) to rotate, the connecting plate (54) moves along the first slide rail (53) as the lead screw (52) rotates, thereby driving the airtight light shielding member (3) and the sensitive element (20) to be separated or connected for installation; The transmission rod (55) slides along the curved surface (560) of the curved transmission member (56) as the connecting plate (54) moves, thereby driving the curved transmission member (56) to rise, thereby separating the element sensor assembly (4) from the sensitive element (20) to be replaced; or driving the curved transmission member (56) to descend, thereby connecting the element sensor assembly (4) to the replaced sensitive element (20).

2. The dangerous gas detector according to claim 1, characterized in that: The sensitive element compartment (2) comprises N unit compartments (21) arranged side by side and at equal intervals, and one sensitive element (20) is arranged in each unit compartment (21), wherein N is an integer greater than or equal to 2.

3. The dangerous gas detector according to claim 1, characterized in that: The hazardous gas detector further comprises a drive plate (8), and the transmission mechanism (5) and the shift mechanism (6) are both electrically connected to the drive plate (8).

4. The dangerous gas detector according to claim 1, characterized in that: The connecting plate (54) is fixedly connected to the airtight light shielding member (3), and the curved surface transmission member (56) is fixedly connected to the element sensor assembly (4).

5. The dangerous gas detector according to claim 4, characterized in that: The transmission mechanism (5) further comprises a first position sensor (501) and a second position sensor (502) arranged at intervals along the extension direction of the lead screw (52).

6. The dangerous gas detector according to claim 4, characterized in that: The transmission mechanism (5) further comprises a nut (57) and a first slider (58), wherein the nut (57) is transmission-connected to the lead screw (52), the first slider (58) is slidingly connected to the first slide rail (53), and the connecting plate (54) is fixedly connected to the nut (57) and the first slider (58).

7. The dangerous gas detector according to claim 1, characterized in that: The shift mechanism (6) comprises a shift motor (61), a base (62) and a second slide rail (63), wherein the shift motor (61) is transmission-connected to the base (62), the base (62) is slidingly connected to the second slide rail (63), and the sensitive element (20) is connected to the base (62).

8. The dangerous gas detector according to claim 7, characterized in that: The shifting mechanism (6) further comprises a rack (64) and a driving wheel (65), wherein the driving wheel (65) is fixedly connected to the output end of the shifting motor (61) and meshes with the rack (64) for transmission, and the rack (64) is fixedly connected to the base (62).

9. The dangerous gas detector according to claim 7, characterized in that: The shifting mechanism (6) further comprises a third position sensor (601) and a fourth position sensor (602) arranged at intervals along the extension direction of the second slide rail (63).

10. The dangerous gas detector according to claim 7, characterized in that: The hazardous gas detector further comprises a housing (12), wherein the housing (12) is fixedly connected to the base plate (10), and the housing (12) is provided with a channel (121) above the second slide rail (63).

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