A system for detecting and automatically alarming hydrogen sulfide gas concentration in urban pipelines

Abstract

The present invention discloses a system for detecting and automatically alarming hydrogen sulfide gas concentration in urban pipelines, comprising a shell fixedly embedded in a manhole cover or an urban pipeline, a storage chamber being arranged in the shell, a countersunk hole opening upward being arranged at the upper end of the storage chamber, a large-diameter connecting groove being arranged at the inner walls on the left and rear sides of the storage chamber, a replacement shell being slidably arranged in the storage chamber, a test paper chamber being arranged in the replacement shell, a sleeve column being fixedly arranged on the lower inner wall of the test paper chamber, a test paper assembly being sleeved on the sleeve column, a pull-out hanging block being connected to the outermost end of the test paper assembly, and the present example aims to design a system for detecting and automatically alarming hydrogen sulfide gas concentration in urban pipelines which can automatically detect the hydrogen sulfide gas content contained in the gas in an urban pipeline within a certain period of time by means of a test paper.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen sulfide concentration detection, in particular to an urban pipeline hydrogen sulfide gas concentration detection and automatic alarm system. Background Art

[0002] In urban pipelines, there are a lot of food residues and feces discharged by urban residents. These pipelines are in a relatively closed state for a long time, which creates a good reaction condition for the fermentation of food residues and feces. During the reaction, a large amount of hydrogen sulfide and other gases harmful to the human body will be produced, which will cause respiratory irritation or even poisoning of pipeline inspectors. Hydrogen sulfide gas is also flammable. When the accumulated hydrogen sulfide comes into contact with open flames, it will deflagrate and explode. Therefore, in urban pipelines, real-time detection of hydrogen sulfide concentration is of far-reaching significance.

[0003] There are three main ways to detect hydrogen sulfide. The first is through a hydrogen sulfide gas detector. This method is more professional and safer, but it has the highest cost. The second is a gas detection tube, which has a slightly lower cost per test than the first detection method. The third is chemical analysis. Commonly used methods include lead acetate detection tube method and lead acetate indicator paper method. It mainly observes the color after the reaction through chemical reagents. The cost of a single test is the lowest but the detection speed is slow. When it is necessary to conduct regular inspections on a certain section of the pipeline, the third method is undoubtedly the lowest cost. However, it needs to be done manually during the inspection, which is extremely inconvenient. Therefore, this example aims to design an urban pipeline hydrogen sulfide gas concentration detection and automatic alarm system that can automatically detect the hydrogen sulfide gas content contained in the gas in the urban pipeline within a certain period of time through a test paper. Summary of the invention

[0004] In order to solve the above problems, this example designs a system for detecting and automatically alarming hydrogen sulfide gas concentration in urban pipelines, the gas concentration detection system comprises a shell fixedly embedded in a manhole cover or an urban pipeline, a storage chamber is arranged in the shell, a countersunk hole opening upward is arranged in communication with the upper end of the storage chamber, a large-diameter connecting groove is arranged in communication with the inner wall of the left side and the rear side of the storage chamber, a replacement shell is slidably arranged in the storage chamber, a test paper chamber is arranged in the replacement shell, a sleeve column is fixedly arranged on the lower inner wall of the test paper chamber, a test paper assembly is sleeved on the sleeve column, a pull-out hanging block is connected to the outermost end of the test paper assembly, a push plate which can slide in the test paper chamber is sleeved on the lower end of the test paper assembly and on the sleeve column, a push spring which can be used to push the test paper assembly upward is fixedly connected between the lower end surface of the push plate and the lower inner wall of the test paper chamber;

[0005] A notch is provided on the inner wall of the rear side of the test paper chamber, and one end of the test paper assembly is stretched out of the notch and fixedly connected to a pull-out hanging block;

[0006] A driving groove is provided in the right inner wall of the storage chamber, and a turntable is rotatably provided in the driving groove, and the left side of the turntable abuts against the outer edge of the replacement shell. A through hole is provided in the turntable so as to penetrate the upper and lower parts. A driving motor is fixedly provided in the lower inner wall of the driving groove. The upper end of the driving motor is connected to a driving gear which can rotate in the through hole and mesh with the inner wall of the through hole. A ring array is provided on the circumferential arc surface of the turntable and the opening is outward, which can engage with the The card slot to which the pull-out hanging block is connected is provided with a communicating air nozzle on the inner wall at the lower side of the card slot, an air inlet which can be communicated with the communicating air nozzle is provided on the inner wall at the lower side of the driving slot, an air blower is connected to the lower end of the air inlet, an air outlet is provided on the inner wall at the front side of the driving slot, a chromatograph is fixedly provided on the inner wall of the driving slot on the right side of the air outlet, and the chromatograph can detect the color of the test strip passing through the rear side of the chromatograph and upload it to the PC;

[0007] When in use, the turntable rotates to drive the pull-out hanging block inserted into the card slot to rotate, thereby pulling out the test strip, and then the reaction of the gas in the air flow channel formed by the air inlet, the card slot and the air outlet causes the chemical components on the test strip to undergo chemical changes and change color, and then the chromatograph compares the colors on the test strip to determine the concentration of hydrogen sulfide contained in the air flow through the air inlet, the card slot and the air outlet channel, and uploads the data through the chromatograph.

[0008] Preferably: the test paper assembly comprises a sleeve which can be sleeved on the sleeve column and can slide on the sleeve column, the sleeve is provided with a notch through groove which runs through from top to bottom and opens outward, the test paper strip for detecting the concentration of hydrogen sulfide is wound on the sleeve, the outer end of the test paper strip is fixedly connected to the pull-out hanging block, and the inner end of the test paper strip is fixedly connected to the end hanging block placed in the notch through groove;

[0009] A rotating block having the same diameter as that of the sleeve column is rotatably connected to the upper end of the sleeve column, and a limiting top block which can slide in the notch slot is fixedly arranged on the rear end surface of the rotating block;

[0010] An opening is provided on the inner wall of the upper side of the test paper chamber and is opened outward, the rotating block is rotatably arranged in the opening and the upper end surface of the rotating block is flush with the upper end surface of the replacement shell;

[0011] The upper end surface of the sleeve is arranged to be inclined, and the lowest point of the inclined portion is the end where the notch through groove is opened;

[0012] When in use, the limit top block is engaged in the notch slot and abuts against the end hanging block in the notch slot, thereby limiting the rise of the sleeve. The pull-out hanging block is engaged with the slot and when the test strip wrapped around the section of the sleeve is completely pulled out, the end hanging block connected to the end of the test strip is pulled out of the notch slot. At this time, the lower end of the limit top block loses its abutment, and the sleeve that has been consumed at the top can be pushed out of the opening at the upper end of the opening under the squeezing and pushing of the sleeve on the lower side.

[0013] Preferably: in order to facilitate the user to replace the consumed test strip, a rotatable sleeve at the upper end of the replacement shell is provided with a limiting fixing ring, and the limiting fixing ring can be threadedly connected to the countersunk hole. The position of the replacement shell can be limited by the threaded connection between the limiting fixing ring and the countersunk hole.

[0014] Preferably: in order to ensure that the turntable drags the test strip to move when rotating, the radius of the driving groove is equal to the sum of the radius of the turntable and the thickness of the test strip;

[0015] A rotating disc is rotatably provided at the lower side of the replacement shell and in the storage chamber, a torsion spring is provided between the rotating disc and the inner wall of the storage chamber, a slide groove opening upward is provided in the rotating disc, a slider is slidably provided in the slide groove, a tightening spring is fixedly provided between the slider and the inner wall of the slide groove, a card slot opening upward is provided in the slider, and a card block that can be engaged with the card slot is fixedly provided on the lower end surface of the replacement shell;

[0016] The inner diameter of the limiting fixed ring is slightly larger than the outer diameter of the replacement shell, and an annular groove is provided in the inner ring of the limiting fixed ring, a rotating ring is rotatably provided in the annular groove, a fixed rotating block extending into the annular groove and rotatable in the annular groove is fixedly provided on the circumferential arc end surface of the replacement shell, and a limiting spring is fixedly provided between the outer ring of the fixed rotating block and the inner ring of the rotating ring;

[0017] When in use, the limiting spring and the tightening spring can push the replacement shell to move right as a whole, so that when a roll of the test strip is consumed, the outer wall of the replacement shell can directly abut against the outer wall of the turntable, and when the turntable rotates, the replacement shell can be driven to rotate, thereby facilitating the pull-out hanging block card to be connected to the card slot.

[0018] Preferably: in order to strengthen the air tightness between the air inlet, the card slot and the air outlet, and thereby increase the gas passage rate of the air flow in the air inlet, the card slot and the air outlet through the test strip at this stage, a plastic ring is provided on the peripheral side surface of the turntable, and the plastic ring can be used to increase the air tightness and increase the friction between the outer side surface of the turntable and the test strip, thereby facilitating the rotation of the turntable to drive the test strip to feed.

[0019] Preferably: in order to prevent the end hanging block from being dragged out of the notch slot before the test strip wrapped around the sleeve is completely consumed, a connector is provided between the notch slot and the end hanging block, and the connector may be glue.

[0020] Preferably: a discarding port connected to the outside is provided on the right inner wall of the driving groove, and a magnet is fixedly provided on the right inner wall of the discarding port. There is a magnetic mutual attraction between the magnet and the pull-out hanging block. When the turntable drives the pull-out hanging block to the discarding port position, the attraction of the magnet to the pull-out hanging block causes the pull-out hanging block to move to the right and fall into the discarding port, thereby maintaining the continuity of the detection of the rotating turntable.

[0021] Preferably: in order to reduce the friction between the test strip and the wall of the notch groove when the test strip is pulled out, a rotating wheel is rotatably provided on the right inner wall of the notch groove. When the test strip is pulled out, the rotating wheel can reduce the friction between the test strip and the inner wall of the notch groove to prevent the test strip from being broken by friction.

[0022] Beneficial effects: When in use, the user can place the device in the pipeline area or in the sewer manhole cover. During use, the device can automatically detect and identify the hydrogen sulfide content contained in the gas in the space during a time period through the test paper, and upload the data to achieve the purpose of real-time detection of the hydrogen sulfide concentration in the area. The cost of use is the lowest compared to hydrogen sulfide gas detectors and gas rapid measurement tubes. No personnel are required to enter when in use, which reduces the risk of poisoning. It is convenient and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] For ease of explanation, the present invention is described in detail with reference to the following specific embodiments and accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the overall structure of a system for detecting and automatically alarming hydrogen sulfide gas concentration in urban pipelines according to the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the gas concentration detection system in the top view direction;

[0026] Figure 3It is a schematic diagram of the structure of the gas concentration detection system in the top view direction;

[0027] Figure 4 for Figure 1 An enlarged schematic diagram of part "A" in FIG.

[0028] Figure 5 is a schematic diagram of the structure of the turntable;

[0029] Figure 6 It is a schematic diagram of the structure of the test strip and the sleeve;

[0030] Figure 7 It is a schematic diagram of the structure of the sleeve and the end hanging block;

[0031] Figure 8 It is a schematic diagram of the structure of the sleeve and the rotating block. DETAILED DESCRIPTION

[0032] Combine the following Figures 1 to 8 The present invention is described in detail. For the convenience of description, the directions mentioned below are defined as follows: the up, down, left, right, front and back directions mentioned below are Figure 1 The up-down, left-right, front-back directions of the projection relationship itself are consistent.

[0033] The present invention relates to a system for detecting the concentration of hydrogen sulfide gas in urban pipelines and for automatically alarming the same. The present invention will be further described below in conjunction with the accompanying drawings of the present invention:

[0034] The present invention discloses a system for detecting and automatically alarming hydrogen sulfide gas concentration in urban pipelines, as shown in the attached Figure 1 -Attached Figure 8 The gas concentration detection system shown in the figure comprises a shell 101 fixedly embedded in a manhole cover or an urban pipeline, a storage chamber 122 is arranged in the shell 101, a countersunk hole 136 opening upward is arranged at the upper end of the storage chamber 122, a large-diameter connecting groove 121 is arranged in the inner wall of the left side and the rear side of the storage chamber 122, a replacement shell 137 is slidably arranged in the storage chamber 122, and a test paper chamber 116 is arranged in the replacement shell 137, A sleeve column 126 is fixedly provided on the lower inner wall of the test paper cavity 116, and a test paper assembly is sleeved on the sleeve column 126. The outermost end of the test paper assembly is connected to a pull-out hanging block 114. A push plate 166 that can slide in the test paper cavity 116 is sleeved on the lower end of the test paper assembly and on the sleeve column 126. A push spring 167 that can be used to push the test paper assembly upward is fixedly connected between the lower end surface of the push plate 166 and the lower inner wall of the test paper cavity 116.

[0035] A notch 115 is formed on the inner wall of the rear side of the test paper cavity 116, and one end of the test paper assembly is stretched out of the notch 115 and fixedly connected to a pull-out hanging block 114;

[0036] A driving groove 102 is provided in the inner wall on the right side of the storage chamber 122, and a turntable 105 is rotatably provided in the driving groove 102, and the turntable 105 is rotatably provided with a left side abutting against the outer edge of the replacement shell 137. A through hole 111 is provided in the turntable 105, and a driving motor 133 is fixedly provided in the inner wall on the lower side of the driving groove 102. The upper end of the driving motor 133 is connected to a driving gear 112 that can rotate in the through hole 111 and mesh with the inner wall of the through hole 111. A ring array and an opening outward are provided on the arc surface of the peripheral side of the turntable 105, which can be connected with the pull-out hanging block. A card slot 103 connected with 114, a communicating air nozzle 104 is provided in the inner wall of the lower side of the card slot 103, an air inlet 134 which can be communicated with the communicating air nozzle 104 is provided in the inner wall of the lower side of the driving slot 102, a blower 165 is connected to the lower end of the air inlet 134, an air outlet 109 is provided in the inner wall of the front side of the driving slot 102, a chromatograph 108 is fixedly provided on the inner wall of the driving slot 102 on the right side of the air outlet 109, and the chromatograph 108 can detect the color of the test strip 117 passing through the rear side of the chromatograph 108 and upload it to the PC;

[0037] When in use, the turntable 105 rotates and drives the pull-out hanging block 114 inserted into the card slot 103 to rotate, thereby pulling out the test strip 117, and then the reaction of the gas in the air flow channel formed by the air inlet 134, the card slot 103 and the air outlet 109 causes the chemical components on the test strip 117 to undergo chemical changes and change color, and then the chromatograph 108 compares the colors on the test strip 117 to determine the concentration of hydrogen sulfide contained in the air flow through the air inlet 134, the card slot 103 and the air outlet 109, and uploads the data through the chromatograph 108.

[0038] Beneficial, such as Figure 1 -Attached Figure 8 The test strip assembly shown in the figure comprises a sleeve 123 which can be sleeved on the sleeve column 126 and can slide on the sleeve column 126, a notch through groove 125 which passes through the sleeve 123 from top to bottom and opens outward, a test strip 117 for detecting the concentration of hydrogen sulfide is wound on the sleeve 123, the outer end of the test strip 117 is fixedly connected to the pull-out hanging block 114, and the inner end of the test strip 117 is fixedly connected to the end hanging block 124 placed in the notch through groove 125;

[0039] A rotating block 141 having the same diameter as the sleeve 126 is rotatably connected to the upper end of the sleeve 126, and a limiting top block 142 that can slide in the notch slot 125 is fixedly arranged on the rear end surface of the rotating block 141;

[0040] An opening 143 is provided on the inner wall of the upper side of the test paper chamber 116 and is opened outward. The rotating block 141 is rotatably disposed in the opening 143 and the upper end surface of the rotating block 141 is flush with the upper end surface of the replacement housing 137.

[0041] The upper end surface of the sleeve 123 is arranged to be inclined, and the lowest point of the inclined portion is the end where the notch through groove 125 is opened;

[0042] When in use, the limiting top block 142 is engaged in the notch groove 125 and abuts against the end hanging block 124 in the notch groove 125, thereby limiting the rise of the sleeve 123. The pull-out hanging block 114 is engaged with the slot 103 and when the test strip 117 wrapped around the section of the sleeve 123 is completely pulled out, the end hanging block 124 connected to the end of the test strip 117 is pulled out of the notch groove 125. At this time, the lower end of the limiting top block 142 loses its abutment, and the sleeve 123 that has been consumed at the top can be pushed out of the upper opening of the opening 143 under the squeezing and pushing of the sleeve 123 on the lower side.

[0043] Advantageously, in order to facilitate the user to replace the consumed test strip 117, a rotatable sleeve at the upper end of the replacement shell 137 is provided with a limiting fixing ring 144, and the limiting fixing ring 144 can be threadedly connected to the countersunk hole 136. The position of the replacement shell 137 can be limited by the threaded connection between the limiting fixing ring 144 and the countersunk hole 136.

[0044] Advantageously, in order to ensure that the turntable 105 drags the test strip 117 to move when rotating, the radius of the driving slot 102 is equal to the sum of the radius length of the turntable 105 and the thickness of the test strip 117;

[0045] A rotating disc 127 is rotatably provided at the lower side of the replacement shell 137 and in the storage chamber 122, a torsion spring 151 is provided between the rotating disc 127 and the inner wall of the storage chamber 122, a slide groove 131 opening upward is provided in the rotating disc 127, a slider 128 is slidably provided in the slide groove 131, a tightening spring 132 is fixedly provided between the slider 128 and the inner wall of the slide groove 131, a card slot 129 opening upward is provided in the slider 128, and a card block 152 that can be engaged with the card slot 129 is fixedly provided on the lower end surface of the replacement shell 137;

[0046] The inner diameter of the limiting fixed ring 144 is slightly larger than the outer diameter of the replacement shell 137, and an annular groove 146 is provided in the inner circle of the limiting fixed ring 144, and a rotating ring 145 is rotatably provided in the annular groove 146. A fixed rotating block 148 extending into the annular groove 146 and rotatable in the annular groove 146 is fixedly provided on the circumferential arc end surface of the replacement shell 137, and a limiting spring 147 is fixedly provided between the outer circle of the fixed rotating block 148 and the inner circle of the rotating ring 145;

[0047] When in use, the limiting spring 147 and the tightening spring 132 can push the replacement shell 137 to move right as a whole, so that when a roll of the test strip 117 is consumed, the outer wall of the replacement shell 137 can directly abut against the outer wall of the turntable 105, and when the turntable 105 rotates, the replacement shell 137 can be driven to rotate, thereby facilitating the pull-out hanging block 114 to be inserted into the card slot 103.

[0048] Beneficially, in order to enhance the air tightness between the air inlet 134, the card slot 103 and the air outlet 109, and thereby increase the gas flow rate of the air inlet 134, the card slot 103 and the air outlet 109 through the test strip 117 at this stage, a plastic ring 154 is provided on the peripheral side surface of the turntable 105. The plastic ring 154 can be used to increase the air tightness and increase the friction between the outer side surface of the turntable 105 and the test strip 117, thereby facilitating the rotation of the turntable 105 to drive the test strip 117 to feed.

[0049] Advantageously, in order to prevent the end hanging block 124 from being dragged out of the notch slot 125 before the test strip 117 wrapped around the sleeve 123 is completely consumed, a connector is provided between the notch slot 125 and the end hanging block 124, and the connector may be glue.

[0050] Beneficial, such as Figure 1 To Attachment Figure 3As shown, a discarding port 106 connected to the outside is provided in the right inner wall of the driving slot 102, and a magnet 107 is fixedly provided on the right inner wall of the discarding port 106. There is a magnetic mutual attraction between the magnet 107 and the pull-out hanging block 114. When the turntable 105 drives the pull-out hanging block 114 to the position of the discarding port 106, the attraction of the magnet 107 to the pull-out hanging block 114 causes the pull-out hanging block 114 to move to the right and fall into the discarding port 106, thereby maintaining the continuity of the detection of the rotating turntable 105.

[0051] Advantageously, in order to reduce the friction between the test strip 117 and the wall of the notch groove 115 when the test strip 117 is pulled out, a rotating wheel 113 is rotatably provided on the right inner wall of the notch groove 115. When the test strip 117 is pulled out, the rotating wheel 113 can reduce the friction between the test strip 117 and the inner wall of the notch groove 115 to prevent the test strip 117 from being pulled apart due to friction.

[0052] When in use, the user slowly places the replacement shell 137 into the storage chamber 122, and makes the clamping block 152 engage in the clamping slot 129, and then rotates the limiting fixing ring 144 so that the limiting fixing ring 144 engages in the countersunk hole 136, thereby limiting the position of the replacement shell 137. At this time, the pull-out hanging block 114 is engaged in the notched groove 115. At this time, the pull-out hanging block 114 abuts against the notched through groove 125 on the uppermost sleeve 123, and abuts against the upper end of the end hanging block 124 in the sleeve 123. At this time, the test paper strip 117 has not been pulled out and under the elastic force of the limiting spring 147 and the tensioning spring 132, the right end of the replacement shell 137 abuts against the left end of the turntable 105;

[0053] The driving motor 133 is started to drive the driving gear 112 to rotate, and drives the rotating disk 105 to rotate. The rotating disk 105 drives the replacement shell 137 to rotate through friction, and then drives the pull-out hanging block 114 to gradually turn to the right and finally get into the card slot 103. The rotating rotating disk 105 is connected with the pull-out hanging block 114 through the card slot 103 and is squeezed by the inner wall of the driving slot 102. The pull-out hanging block 114 rotates with the rotating disk 105, and drives the test strip 117 to be gradually pulled out. According to the timing, the rotating disk 105 rotates intermittently;

[0054] When the test strip 117 passes through the air inlet 134 and the air outlet 109, the blower 165 draws out the gas in the pipeline through the air inlet 134, the corresponding card slot 103 and the air outlet 109, and during the drawing process, the airflow crosses the test strip 117 of this section and reacts with the test strip 117 to change the color of the test strip 117. When the test strip 117 of this section passes through the chromatograph 108, the chromatograph 108 identifies and compares the color of this section and uploads it, and then the average concentration of hydrogen sulfide in this time period can be calculated by time, flow rate and color depth;

[0055] When a roll of the test strip 117 is consumed, the end hanging block 124 is pulled out of the notch slot 125 along with the end of the test strip 117 and is brought to the discard port 106 through the card slot 103 for discard. After the end hanging block 124 is pulled out, the sleeve 123 of this section loses the constraint of the limiting top block 142. At this time, the sleeve 123 is pushed out of the opening 143 under the push of the pushing plate 166 on the lower side, and the sleeve 123 of the next section moves up, and under the guidance of the inclined surface of the upper end surface of the sleeve 123, the limiting top block 142 is inserted into the notch slot 125 of the sleeve 123 of this section for continued use.

[0056] The beneficial effects of the present invention are as follows: when in use, the user can place the device in a pipeline area or in a sewer manhole cover. During use, the device can automatically detect and identify the hydrogen sulfide content contained in the gas in the space during a time period through a test paper, and upload the data to achieve the purpose of real-time detection of the hydrogen sulfide concentration in the area. The cost of use is the lowest compared to hydrogen sulfide gas detectors and gas rapid measurement tubes. No personnel are required to enter during use, thereby reducing the risk of poisoning. It is convenient and effective.

[0057] Through the above methods, those skilled in the art can make various changes according to the working mode within the scope of the present invention.

Claims

1. A system for detecting and automatically alarming hydrogen sulfide gas concentration in urban pipelines, comprising a shell fixedly embedded in a manhole cover or an urban pipeline, wherein a storage chamber is arranged in the shell, a countersunk hole opening upward is arranged at the upper end of the storage chamber, a large-diameter connecting groove is arranged in the left and rear inner walls of the storage chamber, a replacement shell is slidably arranged in the storage chamber, a test paper chamber is arranged in the replacement shell, a sleeve column is fixedly arranged on the lower inner wall of the test paper chamber, a test paper assembly is sleeved on the sleeve column, a pull-out hanging block is connected to the outermost end of the test paper assembly, a push plate which can slide in the test paper chamber is sleeved on the lower end of the test paper assembly and on the sleeve column, a push spring which can be used to push the test paper assembly upward is fixedly connected between the lower end surface of the push plate and the lower inner wall of the test paper chamber; A notch is provided on the inner wall of the rear side of the test paper chamber, and one end of the test paper assembly is stretched out of the notch and fixedly connected to a pull-out hanging block; The test strip assembly comprises a sleeve that can be sleeved on the sleeve column and can slide on the sleeve column, a notch through-groove that runs through the sleeve from top to bottom and opens outward, a test strip for detecting the concentration of hydrogen sulfide is wound on the sleeve, the outer end of the test strip is fixedly connected to the pull-out hanging block, and the inner end of the test strip is fixedly connected to an end hanging block placed in the notch through-groove; A rotating block having the same diameter as that of the sleeve column is rotatably connected to the upper end of the sleeve column, and a limiting top block which can slide in the notch slot is fixedly arranged on the rear end surface of the rotating block; An opening is provided on the inner wall of the upper side of the test paper chamber and is opened outward, the rotating block is rotatably arranged in the opening and the upper end surface of the rotating block is flush with the upper end surface of the replacement shell; The upper end surface of the sleeve is arranged to be inclined, and the lowest point of the inclined portion is the end where the notch through groove is opened; A driving groove is provided in the right inner wall of the storage chamber, and a turntable is rotatably provided in the driving groove, and the left side of the turntable abuts against the outer edge of the replacement shell. A through hole is provided in the turntable so as to penetrate the upper and lower parts. A driving motor is fixedly provided in the lower inner wall of the driving groove. The upper end of the driving motor is connected to a driving gear which can rotate in the through hole and mesh with the inner wall of the through hole. A ring array is provided on the circumferential arc surface of the turntable and the opening is outward, which can engage with the The card slot to which the pull-out hanging block is connected is provided with a communicating air nozzle on the inner wall at the lower side of the card slot, an air inlet which can be communicated with the communicating air nozzle is provided on the inner wall at the lower side of the driving slot, an air blower is connected to the lower end of the air inlet, an air outlet is provided on the inner wall at the front side of the driving slot, a chromatograph is fixedly provided on the inner wall of the driving slot on the right side of the air outlet, and the chromatograph can detect the color of the test strip passing through the rear side of the chromatograph and upload it to the PC; A rotatable sleeve at the upper end of the replacement shell is provided with a limiting fixing ring, and the limiting fixing ring can be threadedly connected with the countersunk hole, and the position of the replacement shell can be limited by the threaded connection between the limiting fixing ring and the countersunk hole; The radius of the driving groove is equal to the sum of the radius of the turntable and the thickness of the test strip; A rotating disc is rotatably provided at the lower side of the replacement shell and in the storage chamber, a torsion spring is provided between the rotating disc and the inner wall of the storage chamber, a slide groove opening upward is provided in the rotating disc, a slider is slidably provided in the slide groove, a tightening spring is fixedly provided between the slider and the inner wall of the slide groove, a card slot opening upward is provided in the slider, and a card block that can be engaged with the card slot is fixedly provided on the lower end surface of the replacement shell; The inner diameter of the limiting fixed ring is larger than the outer diameter of the replacement shell, and an annular groove is provided in the inner circle of the limiting fixed ring, a swivel ring is rotatably provided in the annular groove, a fixed rotating block extending into the annular groove and rotatable in the annular groove is fixedly provided on the circumferential arc end face of the replacement shell, and a limiting spring is fixedly provided between the outer circle of the fixed rotating block and the inner circle of the swivel ring.

2. A system for detecting and automatically alarming hydrogen sulfide gas concentration in urban pipelines as claimed in claim 1, characterized in that: A plastic ring is arranged on the peripheral side of the turntable, and the plastic ring can be used to increase the air tightness and increase the friction between the outer side of the turntable and the test strip, thereby facilitating the rotation of the turntable to drive the test strip to feed.

3. A system for detecting and automatically alarming hydrogen sulfide gas concentration in urban pipelines as claimed in claim 2, characterized in that: A connector is provided between the notch through groove and the end hanging block, and the connector is glue.

4. A system for detecting and automatically alarming hydrogen sulfide gas concentration in urban pipelines as claimed in claim 3, characterized in that: A discarding port connected to the outside is arranged in the right inner wall of the driving groove, and a magnet is fixedly arranged on the right inner wall of the discarding port. There is a magnetic mutual attraction between the magnet and the pull-out hanging block.

5. The urban pipeline hydrogen sulfide gas concentration detection and automatic alarm system as claimed in claim 1, characterized in that: A rotating wheel is rotatably arranged in the right inner wall of the notch groove.

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