A hydrogen sulfide digital fluorescence rapid detection device

Abstract

The application relates to the field of fluorescence detection technology and discloses a hydrogen sulfide digital fluorescence rapid detection device, which comprises a main body and fluorescent test paper; an ultraviolet LED is fixedly connected to the top of the main body; and a silicon light detector is fixedly connected to the top of the main body. When the gas flows from the edge to the center of the fluorescent test paper and interacts, the diffused gas flows into the recess space formed by the sliding plate on the bottom of the fixed cylinder, is temporarily buffered, the influence of the gas on the remaining gas after the interaction in the middle of the test paper is reduced, the airflow passing through the center of the fluorescent test paper is smoother, the uneven contact between the fluorescent probe on the test paper and the hydrogen sulfide substance is reduced, the difference in local fluorescence reaction intensity is avoided, the stable display of the fluorescence signal is ensured, and the detection accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of fluorescence detection technology, specifically to a digital fluorescence rapid detection device for hydrogen sulfide. Background Technology

[0002] The rapid digital fluorescence detection of hydrogen sulfide is a technology that enables rapid, high-precision, and traceable digital quantification of H2S in gases and water bodies by combining the principle of specific recognition of fluorescent molecules with micro-optical paths, digital signal processing and Internet of Things technology. When rapidly detecting hydrogen sulfide gas using fluorescence, a test strip with a fluorescent probe is typically placed at the gas inlet of the detector. The detector's built-in suction pump draws in external gas, mixing the hydrogen sulfide with the fluorescent probe. After the test strip is irradiated with ultraviolet LEDs, a silicon photodetector continuously collects the fluorescence intensity and converts it into a digital signal, achieving rapid detection of hydrogen sulfide. To minimize interference from external light, the gas inlet is usually positioned in the center of the test strip. When the suction pump draws in gas, it preferentially passes through the center of the test strip and washes towards the edges. This can easily cause uneven contact between the fluorescent probe and hydrogen sulfide on the test strip, resulting in differences in local fluorescence intensity and fluctuations in the digital fluorescence signal, affecting the accuracy of the detection. Summary of the Invention

[0003] The purpose of this invention is to provide a rapid digital fluorescence detection device for hydrogen sulfide to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a digital fluorescence rapid detection device for hydrogen sulfide, comprising a main body and a fluorescent test strip. An ultraviolet LED is fixedly connected to the top of the main body, and a silicon photodetector is also fixedly connected to the top of the main body. The device further includes: The guiding mechanism is installed on the top of the main body to ensure the stability of the contact between the gas and the fluorescent test paper when the gas is drawn in. The guiding mechanism includes a fixed cylinder located at the top of the main body, and the outer surface of the fixed cylinder has several rectangular grooves. Several rectangular grooves are arranged in a circular array with the center of the fixed cylinder as the center; The active mechanism is installed inside the fixed tube to prevent the fluorescent test strip from shaking when the gas passes through the fixed tube and folds back. The moving mechanism includes a rotating plate rotatably connected inside a rectangular groove, and a long rod rotatably connected to the side wall of the rotating plate.

[0005] Furthermore, the main body includes: A storage component is installed on top of the main body to prevent light penetration during the detection process.

[0006] Furthermore, the guiding bodies also include: A fixing component is installed inside the storage component to ensure that the gas passes through the fluorescent test paper uniformly and stably; The deformation component is installed inside the fixed component to ensure the permeability of gas through the fluorescent test paper.

[0007] Furthermore, the organizations involved in the activities also include: A connecting component is installed on the side wall of the long rod; An auxiliary component is installed on the side wall of the connecting component to prevent the fluorescent test strip from shaking.

[0008] Furthermore, the storage component includes a mounting cavity fixedly connected to the top of the main body, and a sealing cap is threaded onto the outer surface of the mounting cavity; An arc-shaped ring is fixedly connected to the inner wall of the sealing cap.

[0009] Furthermore, the top of the fixed cylinder is fixedly connected to the inner wall of the top of the sealing cap; The fixing component includes a spiral groove formed on the outer surface of the fixing cylinder, and a circular ring is slidably connected to the outer surface of the fixing cylinder; The fixing cylinder is arranged in an arc shape on the side closest to the main body; The disc ring is slidably disposed between the fixed cylinder and the sealing cap, and there is a flow channel between the inner walls of the fixed cylinder and the sealing cap, which is used to guide the gas in a spiral form on the surface of the fixed cylinder towards the fluorescent test paper when the gas enters.

[0010] Furthermore, the deformation assembly includes a limiting spring fixedly connected to the inner wall of the top of the fixed cylinder, and a sliding plate fixedly connected to the bottom of the limiting spring; A rubber layer is fixedly connected to the outer surface of the sliding plate, and the outer surface of the rubber layer is fixedly connected to the inside of the fixed cylinder; The rubber layer is inclined between the inner wall of the fixed cylinder and the sliding plate. As the sliding plate slides upward, it drives the rubber layer to adhere to the arc-shaped side wall of the fixed cylinder. At this time, the rubber layer will form an arc-shaped guiding state towards the fluorescent test paper.

[0011] Furthermore, the connecting assembly includes a movable rod rotatably connected to the outer surface of the long rod; The auxiliary component includes a fixed ring rotatably connected between several long rods, and a movable ring is slidably connected inside the fixed ring.

[0012] Furthermore, a recessed ring is fixedly connected to the bottom of the movable ring; The end of the movable rod furthest from the long rod is rotatably connected to the side wall of the sliding plate.

[0013] The present invention has the following beneficial effects: 1. In this invention, when gas flows from the edge of the fluorescent test paper towards the center and undergoes interactive diffusion, the diffused gas flows into the recessed space formed by the upward movement of the sliding plate at the bottom of the fixed cylinder, providing temporary buffering. This reduces the impact of gas interaction in the center of the test paper on the entry of other gases, making the airflow through the center of the fluorescent test paper smoother. This reduces uneven contact between the fluorescent probe and hydrogen sulfide on the test paper, which can lead to differences in local fluorescence intensity. This ensures stable display of the fluorescence signal while improving the accuracy of detection.

[0014] 2. In this invention, when the gas continuously diffuses in the central region of the fluorescent test paper, the diffused gas will flow downwards under the guidance of the sidewall of the rubber layer in the arc-shaped region. By causing the gas to flow downwards, the flow rate of the gas through the fluorescent test paper can be kept stable, the fluorescence intensity can be kept stable when the fluorescent test paper is mixed with hydrogen sulfide, and the detection efficiency of fluorescence detection can be improved.

[0015] 3. In this invention, when the fluorescent test paper bulges in the gas flow, it pushes the movable ring and the concave ring to slide upward. At this time, the concave ring will slow down the bulging amplitude of the fluorescent test paper under the push of the returning gas. This can reduce the situation where the fluorescent test paper bulges up and down due to airflow disturbance during the gas passage and return flow, ensuring the stability of the optical path focusing when the silicon photodetector detects the fluorescence brightness on the surface of the fluorescent test paper, and further improving the detection efficiency.

[0016] 4. In the process of resetting the sliding plate, the rubber layer is pulled to restore it to its tilted state. During the resetting process of the sliding plate and the rubber layer, the gas remaining in the recessed area at the bottom of the fixed cylinder is discharged outward during the rotation of the rotating plate. At the same time, it can also prevent the presence of gas residue inside the mounting cavity and the sealing cover when switching to clean air for external purging. This reduces the interference of gas residue with subsequent detection, while improving the continuity of detection and the accuracy of detection concentration.

[0017] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments 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.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall partial cross-sectional structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 This is an exploded view of the storage component of the present invention; Figure 5 This is a partially exploded cross-sectional view of the storage component of the present invention; Figure 6 This is a partially exploded cross-sectional view of the fixing component of the present invention; Figure 7 This is a partial exploded cross-sectional view of the active mechanism of the present invention; Figure 8 This is a schematic half-sectional view of the entire invention.

[0020] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Main body; 101. Ultraviolet LED; 102. Silicon photodetector; 11. Storage component; 111. Mounting cavity; 112. Sealing cover; 113. Arc ring; 2. Guiding mechanism; 21. Fixing component; 211. Fixing cylinder; 212. Rectangular groove; 213. Circular ring; 22. Deformation component; 221. Limiting spring; 222. Sliding plate; 223. Rubber layer; 3. Movable mechanism; 301. Rotating plate; 31. Connecting component; 311. Long rod; 312. Movable rod; 32. Auxiliary component; 321. Fixing ring; 322. Movable ring; 323. Recessed ring; 4. Fluorescent test paper. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1-8 As shown, this invention is a digital fluorescence rapid detection device for hydrogen sulfide, comprising a main body 1 and a fluorescent test strip 4. An ultraviolet LED 101 is fixedly connected to the top of the main body 1, and a silicon photodetector 102 is also fixedly connected to the top of the main body 1. The device further includes: The guide mechanism 2 is installed on the top of the main body 1 to ensure the stability of the contact between the gas and the fluorescent test paper 4 when the gas is drawn. The guiding mechanism 2 includes a fixed cylinder 211 disposed on the top of the main body 1, and the outer surface of the fixed cylinder 211 is provided with a plurality of rectangular grooves 212; Several rectangular slots 212 are arranged in a circular array with the center of the fixed cylinder 211 as the center; The active mechanism 3 is installed inside the fixed cylinder 211 to prevent the fluorescent test paper 4 from shaking when the gas passes through the fixed cylinder 211 and folds back. The movable mechanism 3 includes a rotating plate 301 rotatably connected inside the rectangular groove 212, and a long rod 311 is rotatably connected to the side wall of the rotating plate 301.

[0023] Entity 1 includes: Storage component 11 is installed on the top of the main body 1 to prevent light penetration during the detection process.

[0024] Guiding mechanism 2 also includes: Fixing component 21 is installed inside storage component 11 to ensure that gas passes through fluorescent test paper 4 uniformly and stably; Deformation component 22 is installed inside the fixing component 21 to ensure the permeability of gas through the fluorescent test paper 4.

[0025] Organization 3 also includes: Connection component 31 is installed on the side wall of long rod 311; Auxiliary component 32 is installed on the side wall of connecting component 31 to prevent the fluorescent test strip 4 from shaking.

[0026] Storage component 11 includes a mounting cavity 111 fixedly connected to the top of the main body 1, and a sealing cap 112 is threadedly connected to the outer surface of the mounting cavity 111; An arc-shaped ring 113 is fixedly connected to the inner wall of the sealing cover 112; When the built-in suction pump of the main body 1 is working, it will draw in the external gas, so that the gas enters the mounting cavity 111 through the sealing cover 112 and passes through the fluorescent test paper 4. At this time, the hydrogen sulfide in the gas will mix with the fluorescent probe on the fluorescent test paper 4, causing the fluorescent test paper 4 to release fluorescent particles, thereby lighting up the fluorescence.

[0027] The top of the fixed cylinder 211 is fixedly connected to the inner wall of the top of the sealing cover 112; The center of the fixed cylinder 211 is fixedly connected to the center of the inner wall of the top of the sealing cover 112, and a flow channel is left between the fixed cylinder 211 and the sealing cover 112 to ensure normal gas flow. The fixing component 21 includes a spiral groove formed on the outer surface of the fixing cylinder 211, and a circular ring 213 is slidably connected to the outer surface of the fixing cylinder 211; Among them, the fixed cylinder 211 is arranged in an arc shape on the side close to the main body 1; The circular ring 213 is slidably disposed between the fixed cylinder 211 and the sealing cover 112, and there is a flow channel between the inner walls of the fixed cylinder 211 and the sealing cover 112, which is used to guide the gas in a spiral form on the surface of the fixed cylinder 211 towards the fluorescent test paper 4 when the gas enters.

[0028] The deformation assembly 22 includes a limiting spring 221 fixedly connected to the inner wall of the top of the fixed cylinder 211, and a sliding plate 222 fixedly connected to the bottom of the limiting spring 221; A rubber layer 223 is fixedly connected to the outer surface of the sliding plate 222, and the outer surface of the rubber layer 223 is fixedly connected to the inside of the fixed cylinder 211; The rubber layer 223 is inclined between the inner wall of the fixed cylinder 211 and the sliding plate 222. As the sliding plate 222 slides upward, it drives the rubber layer 223, causing the rubber layer 223 to adhere to the arc-shaped side wall of the fixed cylinder 211. At this time, the rubber layer 223 will form an arc-shaped guiding state towards the fluorescent test paper 4.

[0029] The connecting assembly 31 includes a movable rod 312 that is rotatably connected to the outer surface of the long rod 311; The auxiliary component 32 includes a fixed ring 321 rotatably connected between several long rods 311, and a movable ring 322 is slidably connected inside the fixed ring 321; The approach of multiple long rods 311 will push the fixed ring 321 together with the movable ring 322 toward the fluorescent test paper 4 and maintain micro-contact with the fluorescent test paper 4. At the same time, the gas refracted through the rubber layer 223 will first impact the concave surface of the recessed ring 323.

[0030] A recessed ring 323 is fixedly connected to the bottom of the movable ring 322; Among them, the end of the movable rod 312 away from the long rod 311 is rotatably connected to the side wall of the sliding plate 222; The concave ring 323 absorbs the impact force of the airflow, so that the movable ring 322 maintains stable support for the fluorescent test paper 4. When the fluorescent test paper 4 bulges in the gas flow, it will push the movable ring 322 and the concave ring 323 to slide upward.

[0031] In use, the operator first installs the fluorescent test paper 4 with the fluorescent probe into the mounting cavity 111, placing the fluorescent test paper 4 between the mounting cavity 111 and the sealing cover 112. Then, the main body 1 is activated, causing the built-in suction pump inside the main body 1 to operate. At the same time, the sealing cover 112 is aligned with or placed in the area to be detected through a pipe. When the built-in suction pump of the main body 1 is working, it will draw in external gas, allowing the gas to enter the mounting cavity 111 through the sealing cover 112 and pass through the fluorescent test paper 4. At this time, the hydrogen sulfide in the gas will mix with the fluorescent probe on the fluorescent test paper 4, causing the fluorescent test paper 4 to release fluorescent clusters, thereby illuminating the fluorescence. Then, the surface of the fluorescent test paper 4 is irradiated by the ultraviolet LED 101, and the fluorescence intensity is continuously collected by the silicon photodetector 102 and converted into a digital signal, which is displayed digitally on the surface of the main body 1, thus completing the purpose of rapid detection of hydrogen sulfide in the gas.

[0032] When the suction pump operates and creates a negative pressure suction inside the mounting cavity 111 and the sealing cover 112, the disc ring 213 slides downward under the negative pressure, connecting the channel between the fixing cylinder 211 and the inner wall of the sealing cover 112. When gas enters the sealing cover 112 and the mounting cavity 111, the gas first contacts the top of the fixing cylinder 211, and then flows spirally along the channel between the spiral groove on the outer surface of the fixing cylinder 211 and the sealing cover 112 towards the fluorescent test paper 4. When the gas reaches the top area of ​​the fluorescent test paper 4, it is affected by the fluorescent... The arc-shaped ring 113 at the edge of the fluorescent test paper 4 guides the flow of gas, creating an annular airflow. Then, as the pump inside the main body 1 continues to operate, the negative pressure creates a uniform pressure difference on the lower surface of the fluorescent test paper 4, causing the gas to flow uniformly from the edge to the center and penetrate the fluorescent test paper 4. Simultaneously, since the rotating plate 301 is initially tilted outwards inside the rectangular groove 212, as the circular ring 213 slides downwards, it presses against the inclined surfaces of multiple rotating plates 301 during its descent, causing the rotating plates 301 to wrap around the rectangular groove. The junction point inside 212 rotates, and simultaneously, the rotating plate 301 rotates to an approximately horizontal state under the push of the circular ring 213. At this time, multiple rotating plates 301 will rotate synchronously and relatively close to each other within the rectangular groove 212. When multiple rotating plates 301 approach each other, they will drive the long rod 311 to approach synchronously. At this time, the long rod 311 moves and pushes the sliding plate 222 through the movable rod 312, causing the sliding plate 222 to compress the limiting spring 221 and slide upward along the inner wall of the fixed cylinder 211. At this time, the bottom of the fixed cylinder 211... This creates a recessed space. When gas flows from the edge of the fluorescent test paper 4 towards the center and undergoes cross-diffusion, the diffused gas flows into the recessed space formed by the upward movement of the sliding plate 222 at the bottom of the fixed cylinder 211, providing temporary buffering. This reduces the impact of gas cross-diffusion in the middle of the test paper on the entry of other gases, making the airflow through the center of the fluorescent test paper 4 smoother. This reduces uneven contact between the fluorescent probe and hydrogen sulfide on the test paper, which can lead to differences in local fluorescence intensity. This ensures stable display of the fluorescence signal while improving the accuracy of detection.

[0033] When multiple long rods 311 approach each other, they push the sliding plate 222 upward through the movable rod 312. The sliding plate 222 will drive the middle part of the rubber layer 223 to slide synchronously, so that the rubber layer 223 is in the arc-shaped guide area at the bottom of the fixed cylinder 211. When the gas flows from the edge of the fluorescent test paper 4 to its center and generates interactive diffusion, when the diffused gas flows to the concave area at the bottom of the fixed cylinder 211, the gas will push the rubber layer 223, so that the rubber layer 223 adheres to the arc-shaped area of ​​the fixed cylinder 211. When the gas continues to diffuse interactively in the middle area of ​​the fluorescent test paper 4, the diffused gas will be guided downward by the side wall of the rubber layer 223 adhering to the arc-shaped area. By the downward reverse flow of the gas, the flow rate of the gas penetrating the fluorescent test paper 4 can be kept stable, the fluorescence intensity of the fluorescent test paper 4 mixed with hydrogen sulfide can be kept stable, and the detection efficiency of fluorescence detection can be improved.

[0034] When multiple rotating plates 301 drive the long rods 311 to approach each other, the approach of the long rods 311 will push the fixed ring 321 and the movable ring 322 towards the fluorescent test paper 4 and maintain micro-contact with the fluorescent test paper 4. At the same time, the gas folded back by the rubber layer 223 first impacts the concave surface of the recessed ring 323. The recessed ring 323 absorbs the impact force of the airflow, so that the movable ring 322 maintains stable support for the fluorescent test paper 4. When the fluorescent test paper 4 bulges in the gas flow, it will push the movable ring 322 and the recessed ring 323 to slide upward. At this time, the recessed ring 323 will slow down the bulging amplitude of the fluorescent test paper 4 under the push of the folded gas, thereby reducing the situation where the fluorescent test paper 4 bulges up and down due to airflow disturbance during the gas passage and folding flow. This ensures the stability of the optical path focusing when the silicon photodetector 102 detects the fluorescence brightness on the surface of the fluorescent test paper 4, and further improves the detection efficiency.

[0035] When the test is completed and the built-in suction pump inside the main body 1 stops working, the disc ring 213 is no longer subject to the suction force of continuous negative pressure. At this time, the sliding plate 222 will reset under the elastic release force of the limiting spring 221. During the reset process, the sliding plate 222 will push the rotating plate 301 to reset through the movable rod 312 and the long rod 311. At the same time, during the reset process of the sliding plate 222, it will pull the rubber layer 223 to restore it to its tilted state. During the reset process of the sliding plate 222 and the rubber layer 223, the gas remaining in the recessed area at the bottom of the fixed cylinder 211 will be discharged outward during the rotation of the rotating plate 301. At the same time, it can also prevent the presence of gas residue inside the mounting cavity 111 and the sealing cover 112 when switching to clean air for external purging. This reduces the interference of gas residue with subsequent tests and improves the continuity of testing and the accuracy of the detection concentration.

[0036] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A rapid digital fluorescence detection device for hydrogen sulfide, comprising a main body (1) and a fluorescent test strip (4), wherein an ultraviolet LED (101) is fixedly connected to the top of the main body (1), and a silicon photodetector (102) is fixedly connected to the top of the main body (1), characterized in that, Also includes: The guiding mechanism (2) is installed on the top of the main body (1) to ensure the stability of the contact between the gas and the fluorescent test paper (4) when the gas is drawn; The guiding mechanism (2) includes a fixed cylinder (211) disposed on the top of the main body (1), and the outer surface of the fixed cylinder (211) is provided with a plurality of rectangular grooves (212). Several rectangular slots (212) are arranged in a circular array with the center of the fixed cylinder (211) as the center; The active mechanism (3) is installed inside the fixed tube (211) to prevent the fluorescent test paper (4) from shaking when the gas passes through the fixed tube (211); The active mechanism (3) includes a rotating plate (301) rotatably connected inside a rectangular groove (212), and a long rod (311) is rotatably connected to the side wall of the rotating plate (301).

2. The rapid digital fluorescence detection device for hydrogen sulfide according to claim 1, characterized in that: The main body (1) includes: Storage component (11), which is installed on top of the main body (1), is used to prevent light penetration during the detection process.

3. The rapid digital fluorescence detection device for hydrogen sulfide according to claim 2, characterized in that: The guiding mechanism (2) also includes: Fixing component (21), which is installed inside the storage component (11), is used to ensure that the gas passes through the fluorescent test paper (4) uniformly and stably. Deformation component (22), which is installed inside the fixing component (21), ensures the permeability of gas through the fluorescent test paper (4).

4. The rapid digital fluorescence detection device for hydrogen sulfide according to claim 3, characterized in that: The activity mechanism (3) also includes: A connecting component (31) is mounted on the side wall of the long rod (311); An auxiliary component (32) is installed on the side wall of the connecting component (31) to prevent the fluorescent test paper (4) from shaking.

5. The rapid digital fluorescence detection device for hydrogen sulfide according to claim 4, characterized in that: The storage component (11) includes a mounting cavity (111) fixedly connected to the top of the body (1), and a sealing cap (112) is threaded onto the outer surface of the mounting cavity (111). An arc-shaped ring (113) is fixedly connected to the inner wall of the sealing cap (112).

6. The rapid digital fluorescence detection device for hydrogen sulfide according to claim 5, characterized in that: The top of the fixed cylinder (211) is fixedly connected to the top inner wall of the sealing cover (112); The fixing component (21) includes a spiral groove formed on the outer surface of the fixing cylinder (211), and a circular ring (213) is slidably connected to the outer surface of the fixing cylinder (211). The fixed cylinder (211) is arranged in an arc shape on the side near the main body (1).

7. The rapid digital fluorescence detection device for hydrogen sulfide according to claim 6, characterized in that: The deformation component (22) includes a limiting spring (221) fixedly connected to the inner wall of the top of the fixed cylinder (211), and a sliding plate (222) is fixedly connected to the bottom of the limiting spring (221). A rubber layer (223) is fixedly connected to the outer surface of the sliding plate (222), and the outer surface of the rubber layer (223) is fixedly connected to the inside of the fixed cylinder (211).

8. The rapid digital fluorescence detection device for hydrogen sulfide according to claim 6, characterized in that: The connecting assembly (31) includes a movable rod (312) rotatably connected to the outer surface of the long rod (311). The auxiliary component (32) includes a fixed ring (321) rotatably connected between a plurality of long rods (311), and a movable ring (322) is slidably connected inside the fixed ring (321).

9. The rapid digital fluorescence detection device for hydrogen sulfide according to claim 8, characterized in that: A recessed ring (323) is fixedly connected to the bottom of the movable ring (322); The end of the movable rod (312) away from the long rod (311) is rotatably connected to the side wall of the sliding plate (222).

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