Audio and video image acquisition and early warning camera applied to rail transit

Abstract

The application relates to the technical field of train video monitoring, in particular to an audio and video image collection and early warning camera applied to rail transit, which comprises a camera body, an audio and video processor and a mounting frame, the audio and video processor is fixedly installed in the mounting frame, and the camera body is fixedly connected to the side wall of the mounting frame; inherent airflow characteristics generated when the train passes through are utilized, an air duct and an air outlet are arranged on the camera body, a second cavity for compressing high-speed airflow is arranged in the mounting frame, high-speed airflow brought by the train is compressed in the second cavity and sprayed downward from the air outlet to form an air curtain barrier, the air curtain barrier effectively blocks stones, dust and rainwater rolled up during train running from directly impacting the lens, the airflow scouring effect can continuously remove pollutants attached to the lens surface, lens surface abrasion caused by physical contact is avoided, and therefore the all-weather and high-reliability operation and maintenance requirements of rail transit are met.

Description

Technical Field

[0001] This invention relates to the field of train video surveillance technology, specifically to an audio and video image acquisition and early warning camera applied to rail transit. Background Technology

[0002] Audio and video image acquisition and early warning cameras are widely used in railway crossings, platforms, along railway lines, and on track maintenance locomotives. These cameras typically face the direction of oncoming trains to capture real-time train operation and the surrounding environment, and are combined with audio and video processors for analysis such as foreign object intrusion and collision warnings. In open-air environments, lens protection for early warning cameras is a key factor affecting system stability. Existing technologies mainly employ the following solutions for lens protection: For example, adding a spherical transparent protective cover to the outside of the camera and installing a wiper mechanism or scraper to clean the cover periodically. While this solution can alleviate dust adhesion, it is insufficient for protecting against stone particles carried by strong winds when trains pass at high speeds. Stone particles hitting the protective cover can easily scratch it, and the wiper may accelerate wear and loss of penetration in dusty environments. Another example is installing a water tank and atomizing nozzle on the early warning camera to rinse the lens during cleaning. This solution relies on a portable water source, cannot provide continuous and immediate protection, and poses a risk of pipe freezing in low-temperature environments. For example, installing a rain guard or front panel above the warning camera can only block rainwater falling vertically, and is basically ineffective against stones and raindrops that come with the high-speed horizontal airflow.

[0003] Therefore, existing protective technologies mainly focus on remedial cleaning or static shielding after pollution occurs; none of these solutions effectively utilize or avoid the high-speed airflow generated when a train passes by. On the one hand, the high-speed airflow carried by the train, including stones, dust, and rainwater, directly impacts the lens, causing physical wear or optical obstruction of the warning camera's lens. On the other hand, existing cleaning mechanisms are also prone to damage or becoming new sources of pollution under the impact of high-speed airflow and sand. This results in cameras losing their warning function within a very short time due to lens distortion in sections with frequent train passage, failing to meet the all-weather, high-reliability operation and maintenance requirements of rail transit.

[0004] Therefore, how to achieve efficient, non-destructive, and continuous cleaning and protection of lenses by utilizing the inherent airflow characteristics of passing trains without requiring an external power source or complex motion mechanisms is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an audio and video image acquisition and early warning camera for rail transit, in order to solve the problem that in the prior art, when an early warning camera is in an open environment, the strong following wind generated by a train passing at high speed will carry stone particles, dust and rainwater, and the stone particles, dust and rainwater carried by the train will damage or contaminate the lens.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A camera for audio and video image acquisition and early warning in rail transit includes a camera body, an audio and video processor, and a mounting frame. The audio and video processor is fixedly installed inside the mounting frame, and the camera body is fixedly connected to the side wall of the mounting frame. A first guide plate is vertically arranged inside the mounting frame, dividing the mounting frame into a first cavity and a second cavity. The audio and video processor is fixedly installed in the first cavity, which is closed at both ends. The second cavity is shaped like a horn, wider at the front and narrower at the rear. An air duct is provided on the upper side of the camera body, running through both the front and rear sides. An air outlet is provided at the front end of the air duct, facing downwards and located on the front side of the camera body. The width of the air outlet is greater than the width of the camera element inside the camera body. A duct is provided at the rear end of the air duct, with the end of the duct away from the camera body extending into the second cavity and located on the rear side of the second cavity.

[0007] The camera body has an air duct on its upper side and an air outlet at the front end of the air duct. A second cavity with a forward-facing opening is set in the mounting frame. When a train passes by at high speed, the high-speed airflow brought by the train first enters the second cavity, which is a horn-shaped structure that is wider at the front and narrower at the back. The high-speed airflow brought by the train is compressed and accelerated again in the second cavity, forming a high-speed airflow jet. Then, the high-speed airflow jet enters the air duct through the air guide pipe. The airflow flows along a preset path in the air duct and finally sprays downward from the air outlet. Furthermore, the width of the air outlet is greater than the width of the camera element, allowing the ejected airflow to fully cover the front of the lens, forming an air curtain barrier. Although the high-speed airflow from the train will carry stones, dust, and rainwater directly towards the lens of the camera body, the air curtain barrier ejected from the air outlet is compressed and accelerated again in the first chamber. The wind speed of the air curtain barrier ejected from the air outlet is greater than that of the high-speed airflow from the train, thus effectively preventing stones, dust, and rainwater stirred up by the train from directly impacting the lens. It can also use the airflow scouring effect to continuously remove contaminants attached to the lens surface. By using dynamic airflow protection instead of static shielding, it avoids the lens wear that may be caused by physical contact and does not require external water sources or cleaning mechanisms, thus achieving lens protection for the camera body.

[0008] Preferably, the second cavity is provided with a second guide plate. The two sides of the second guide plate are respectively attached to the side wall of the first guide plate and the inner side wall of the mounting frame. The cross-section of the second guide plate is V-shaped, and the opening of the second guide plate faces the rear. The second guide plate divides the second cavity into a first compression chamber and a second compression chamber. The first compression chamber is located above the second compression chamber. The first and second compression chambers have the same volume. Both the upper and lower inclined surfaces of the second guide plate are provided with through holes. The rear end of the second guide plate is provided with a sealing plate, which seals the inside of the second guide plate into an air inlet chamber. The air guide pipe extends into the air inlet chamber.

[0009] By installing a V-shaped baffle plate inside the No. 2 cavity, the No. 2 cavity is further divided into two compression cavities of equal volume, the No. 1 and the No. 2 compression cavities. When a train passes through at high speed, the high-speed airflow entering the No. 2 cavity is first diverted by the No. 2 baffle plate and enters the No. 1 and No. 2 compression cavities respectively. Under the guidance of the V-shaped structure, the airflow is further compressed and accelerated in the No. 1 and No. 2 compression cavities. Then, it enters the air intake cavity through the through holes on the upper and lower inclined surfaces of the No. 2 baffle plate. The through holes not only ensure the smooth passage of airflow, but also perform preliminary filtration of larger particles in the airflow, reducing the risk of blockage to the subsequent air duct and air outlet. The high-speed airflow entering the air intake cavity then enters the air duct through the air guide pipe and finally sprays out from the air outlet to form an air curtain barrier, effectively preventing stone particles, dust and rainwater stirred up by the train from directly impacting the lens, thus protecting the lens of the camera body.

[0010] Furthermore, the high-speed airflow brought by the train acts on the No. 1 guide plate, and the thrust generated by the high-speed airflow is directed towards the right side of the mounting frame. The thrust of the high-speed airflow acting on the No. 1 guide plate acts on the mounting frame, enhancing the structural stability of the mounting frame in a high-speed airflow environment and preventing the mounting frame from shaking or shifting due to airflow impact, thereby ensuring the stability of the camera body during operation. At the same time, a No. 2 guide plate is set in the No. 2 cavity. The No. 2 guide plate not only plays the role of diverting and accelerating the airflow, but its V-shaped structure can also effectively disperse the direct impact force of the airflow on the mounting frame, further improving the wind pressure resistance of the overall structure.

[0011] Preferably, the lower side of the sealing plate is provided with a sand discharge port that extends through both the front and rear sides. A baffle is rotatably installed on the side of the sealing plate facing the air inlet cavity. The baffle includes a first plate and a second plate. The first plate is located above the second plate. The first plate and the second plate are fixedly connected, and the position where the first plate and the second plate meet is rotatably installed with the sealing plate. The length of the first plate is greater than the length of the second plate, and the length of the second plate is greater than the height of the sand discharge port. A torsion spring is provided at the hinge position between the baffle and the sealing plate. In the absence of wind, the baffle forms an acute angle with the sealing plate under the action of the torsion spring, and the lower end of the second plate extends to the rear side of the sealing plate.

[0012] By setting a sand discharge port on the lower side of the sealing plate, when the train passes through at high speed and generates a high-speed airflow, the high-speed airflow enters the No. 2 chamber and is accelerated by the No. 2 guide plate before entering the air intake chamber. At this time, some sand particles and other impurities in the airflow will be deposited downwards due to gravity. In a windless state, the baffle forms an acute angle with the sealing plate under the action of the torsion spring, and the lower end of the second plate extends to the rear side of the sealing plate. Sand and other impurities can be discharged through the sand discharge port, preventing them from accumulating in the air inlet cavity and affecting airflow and normal equipment operation. When a train passes by and generates high-speed airflow, the high-speed airflow acts on the front side of the baffle. Since the length of the first plate is greater than that of the second plate, the thrust of the high-speed airflow on the first plate is greater than that on the second plate. The baffle rotates along the hinge point with the sealing plate until the rear side of the first plate is in contact with the front side of the sealing plate. At this time, the second plate closes the sand discharge port, thereby preventing the high-speed airflow from being discharged from the sand discharge port. This ensures that all the high-speed airflow entering the air inlet cavity can enter the air duct through the air guide pipe and then be sprayed out from the air outlet to form an effective air curtain barrier, blocking the stone particles, dust and rainwater stirred up by the train from directly impacting the lens. Moreover, the baffle can automatically adjust its position according to the presence or absence of airflow, realizing the dual functions of sand discharge and wind protection, improving the adaptability and reliability of the equipment.

[0013] Preferably, the camera body is provided with a buckle plate, the buckle plate has a U-shaped cross-section with the opening facing downwards, the inner sidewall of the buckle plate and the upper end face of the camera body form an air duct, the upper inner sidewall of the buckle plate is provided with a baffle strip, the baffle strip is provided on the front side of the buckle plate, the lower end of the baffle strip extends to the lower side of the upper end face of the camera body by 2-5mm, the vertical projection of the baffle strip is an arc shape with the opening facing the rear side, and the lower end of the rear side of the baffle strip is provided with a chamfer, the bevel of the chamfer is at an angle of 3° to 10° with the front end face of the camera body.

[0014] By setting a baffle strip on the upper inner wall of the buckle plate, when the high-speed airflow flows from the rear to the front of the air duct, the high-speed airflow impacts the arc-shaped surface of the baffle strip. Due to the special shape design of the baffle strip, the airflow will smoothly split to both sides along the arc-shaped surface after impact, avoiding direct impact on the front face of the camera body. At the same time, the lower end of the baffle strip extends 2-5mm below the upper surface of the camera body, and the chamfered bevel is at 3°-10° with the front face of the camera body. This allows the high-speed airflow to fit more closely to the surface of the camera body during the splitting process, reducing airflow turbulence and eddy current generation, and further reducing the impact of airflow on the lens. Moreover, when a small amount of sand or impurities move with the airflow, the chamfer on the baffle strip can play a certain guiding role, preventing the sand or impurities from directly hitting the lens, ensuring that the camera body can work continuously and stably in complex environments where trains frequently pass by.

[0015] Preferably, the upper inner wall of the buckle plate is provided with a guide block, the lower end face of the guide block is in contact with the upper end face of the camera body, the rear side of the guide block is V-shaped and the front end is arc-shaped, the rear side wall of the barrier strip and the front side wall of the guide block form an air outlet, the arc-shaped surface at the front end of the guide block is equidistant from the arc-shaped surface at the rear end of the barrier strip, and both the left and right ends of the arc-shaped surface at the front end of the guide block are flush with the front end face of the camera body.

[0016] By setting a guide block on the upper inner wall of the buckle plate, when the high-speed airflow flows to the air outlet in the air duct, the V-shaped structure on the rear side of the guide block can converge and guide the airflow, making the airflow more concentrated and flowing towards the air outlet. The arc-shaped surface at the front end of the guide block is equidistant from the arc-shaped surface at the rear end of the barrier strip, and the left and right ends are flush with the front end of the camera body. This ensures that the airflow flows out evenly at the air outlet, forming a stable and wide-coverage air curtain barrier. This allows the air curtain barrier to more effectively block the stone particles, dust and rainwater kicked up by the train from directly impacting the lens, providing protection for the lens of the camera body. This ensures that the camera can work continuously and stably in the complex rail transit environment, meeting the operation and maintenance requirements of rail transit.

[0017] Preferably, an isolation mesh is provided in the passage holes on both the upper and lower sides. The upper surface of the isolation mesh on the upper side is flush with the upper side of the second guide plate, and the lower surface of the isolation mesh on the lower side is flush with the lower side of the second guide plate.

[0018] By installing isolation nets on the passage holes, when a train passes at high speed, generating a high-speed airflow, the airflow enters the second chamber and is diverted by the second guide plate before entering the air intake chamber through the passage holes on both the upper and lower sides. At this time, the isolation nets effectively intercept larger particles in the airflow, such as sand and pebbles, preventing these particles from entering the air intake chamber and clogging the air duct or damaging subsequent air ducts and outlets. The upper surface of the upper isolation net is flush with the upper side of the second guide plate, and the lower surface of the lower isolation net is flush with the lower side of the second guide plate, ensuring that the high-speed airflow can smoothly enter the passage holes while maximizing the filtering effect of the isolation nets. This improves the stability and reliability of the equipment and further ensures the normal operation of the camera body in complex environments.

[0019] Preferably, a filter screen is provided at one end of the air duct that extends into the air inlet cavity, and the filter screen is fixedly connected to the inlet of the air duct.

[0020] By installing a filter screen at one end of the air duct extending into the air inlet cavity, when the high-speed airflow generated by the train passing through at high speed carries sand, dust and other impurities into the No. 2 cavity, and after being diverted and accelerated by the No. 2 guide plate before entering the air inlet cavity, the filter screen can further intercept and filter the tiny particles in the airflow. If the tiny particles enter the air duct directly without being filtered, they may cause wear to the inner wall of the air duct over a long period of time, or adhere to the lens surface after being sprayed out from the air outlet with the airflow, affecting the imaging quality of the camera. The filter screen can ensure that the airflow entering the air duct is cleaner.

[0021] Preferably, a magnetic block is provided on the front side of the air inlet cavity, the magnetic block is fixedly connected to the second guide plate, and the front and rear projections of the magnetic block and the two through holes do not overlap.

[0022] By installing a magnetic block on the front side of the air inlet cavity and ensuring that the magnetic block is fixedly connected to the No. 2 guide plate, and that the front and rear projections of the magnetic block and the two through holes do not overlap, when a train passes through at high speed and generates a high-speed airflow, the metal particles carried by the airflow enter the No. 2 cavity and are diverted and accelerated by the No. 2 guide plate before entering the air inlet cavity. The magnetic block can use its own magnetism to attract the metal particles in the airflow, preventing these metal particles from entering the subsequent air duct and air outlet, avoiding wear on the inner wall of the air duct or blockage of the air outlet, thus ensuring the normal operation of the camera body in the complex rail traffic environment and further improving the stability and reliability of the equipment.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention utilizes the inherent airflow characteristics generated when a train passes by. It sets up an air duct and an air outlet on the camera body, and sets up a second chamber within the mounting frame to compress high-speed airflow. The high-speed airflow brought by the train is compressed and accelerated in the second chamber to form a high-speed airflow jet, which then enters the air duct through the air guide pipe and finally sprays downward from the air outlet to form an air curtain barrier. This effectively prevents stone particles, dust and rainwater stirred up by the train from directly impacting the lens. It can also use the airflow to continuously remove contaminants attached to the lens surface, avoiding lens wear that may be caused by physical contact, thereby meeting the all-weather, high-reliability operation and maintenance requirements of rail transit.

[0024] 2. This invention further compresses and accelerates the airflow by setting a second guide plate in the second cavity, thereby increasing the airflow speed and enhancing the protective effect of the air curtain barrier. The V-shaped structure of the second guide plate can also disperse the impact force of the airflow on the mounting frame, improving the overall structure's wind pressure resistance. At the same time, by setting a sand discharge port and an automatically adjustable baffle, the invention achieves the dual functions of sand discharge and wind protection, preventing the accumulation of sand and other impurities in the air inlet cavity, ensuring smooth airflow and normal operation of the equipment, and further improving the stability and reliability of the equipment.

[0025] 3. By setting barrier strips and guide blocks on the buckle plate, the present invention optimizes the airflow path, so that the airflow can flow out evenly at the air outlet, forming a stable and wide-coverage air curtain barrier, which effectively blocks the impact of various pollutants generated during train operation on the lens, providing reliable protection for the camera body, thereby ensuring that the camera body can work continuously and stably in the rail transit environment, and meeting the operation and maintenance requirements of rail transit. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the audio and video image acquisition and early warning camera of the present invention applied to rail transit. Figure 2 This is a left view of the audio and video image acquisition and early warning camera of the present invention applied to rail transit; Figure 3 for Figure 2 Full sectional view at point AA; Figure 4 for Figure 3 Full sectional view at point BB; Figure 5 for Figure 4 A magnified view of a section at point D; Figure 6 for Figure 4 A magnified view of a section at point E in the middle; Figure 7 for Figure 3 Full sectional view at point CC; Figure 8 A front view of an audio-visual image acquisition and early warning camera used in rail transit; Figure 9 This is a top view of an audio-visual image acquisition and early warning camera used in rail transit.

[0027] In the diagram: 1. Camera body; 101. Air duct; 102. Air outlet; 2. Audio / video processor; 3. Mounting frame; 301. First cavity; 302. Second cavity; 3021. First compression cavity; 3022. Second compression cavity; 4. First guide plate; 5. Air duct; 6. Second guide plate; 601. Through hole; 602. Air inlet cavity; 7. Sealing plate; 701. Sand discharge port; 8. Baffle; 801. First plate; 802. Second plate; 9. Buckle plate; 901. Barrier strip; 902. Guide block; 10. Isolation net; 11. Filter screen; 12. Magnetic block. Detailed Implementation

[0028] Please see Figures 1 to 9 This invention provides an audio and video image acquisition and early warning camera for rail transit, the technical solution of which is as follows: Please refer to the following: An audio and video image acquisition and early warning camera for use in rail transit. Figures 1 to 3 , Figures 7 to 9 The system includes a camera body 1, an audio / video processor 2, and a mounting frame 3. The audio / video processor 2 is fixedly installed inside the mounting frame 3, and the camera body 1 is fixedly connected to the side wall of the mounting frame 3. A first guide plate 4 is vertically installed inside the mounting frame 3, dividing the mounting frame 3 into a first cavity 301 and a second cavity 302. The audio / video processor 2 is fixedly installed inside the first cavity 301, which is closed at both ends. The second cavity 302 is shaped like a horn, wider at the front and narrower at the back. A buckle plate 9 is provided on the camera body 1. The buckle plate 9 has a U-shaped cross-section with the opening facing downwards. The inner side wall of the buckle plate 9 and the upper end face of the camera body 1 form an air duct 101. A barrier strip 901 is provided on the upper inner side wall of the buckle plate 9. The barrier strip 901 is located on the front side of the buckle plate 9, and its lower end extends 3mm below the upper end face of the camera body 1. The vertical projection of the barrier strip 901 has an opening facing backwards. The barrier strip 901 has an arc shape, and the lower end of its rear side is chamfered, with the chamfered surface forming a 3° angle with the front end of the camera body 1. The upper inner wall of the buckle plate 9 has a guide block 902, the lower end of which is flush with the upper end of the camera body 1. The guide block 902 has a V-shaped rear side and an arc-shaped front end. The rear wall of the barrier strip 901 and the front wall of the guide block 902 form an air outlet. The arc-shaped surface at the front of the guide block 902 is flush with the barrier strip. The rear arc-shaped surfaces of 901 are equidistantly arranged, and the left and right ends of the arc-shaped surface at the front end of the guide block 902 are flush with the front end of the camera body 1; the air outlet 102 is located on the front side of the camera body 1, and the width of the air outlet 102 is greater than the width of the camera element inside the camera body 1; the rear end of the air duct 101 is provided with a guide pipe 5, and the end of the guide pipe 5 away from the camera body 1 extends into the second cavity 302 and is located on the rear side of the second cavity 302.

[0029] For further details, please refer to Figure 4 , Figure 5 and Figure 8The second cavity 302 is equipped with a second guide plate 6. The two sides of the second guide plate 6 are respectively attached to the side wall of the first guide plate 4 and the inner side wall of the mounting frame 3. The cross-section of the second guide plate 6 is V-shaped, and the opening of the second guide plate 6 faces the rear. The second guide plate 6 divides the second cavity 302 into a first compression cavity 3021 and a second compression cavity 3022. The first compression cavity 3021 is located above the second compression cavity 3022. The first compression cavity 3021 and the second compression cavity 3022 have the same volume. Both the upper and lower inclined surfaces of the second guide plate 6 are provided with through holes 601, and both the upper and lower through holes 601 are provided with isolation nets 10. The upper surface of the upper isolation net 10 is flush with the upper side of the second guide plate 6, and the lower surface of the lower isolation net 10 is flush with the lower side of the second guide plate 6. A filter 11 is provided at one end of the air duct 5 that extends into the air inlet cavity 602. The filter 11 is fixedly connected to the opening of the air duct 5. A sealing plate 7 is provided at the rear end of the second guide plate 6. The sealing plate 7 seals the second guide plate 6 to form the air inlet cavity 602. The air duct 5 extends into the air inlet cavity 602. A magnetic block 12 is provided at the front of the air inlet cavity 602. The magnetic block 12 is fixedly connected to the second guide plate 6, and the front and rear projections of the magnetic block 12 and the two through holes 601 do not overlap.

[0030] For further details, please refer to Figure 4 , Figure 6 and Figure 8 The lower side of the sealing plate 7 is provided with a sand discharge port 701 that runs through both the front and rear sides. A baffle 8 is rotatably installed on the side of the sealing plate 7 facing the air inlet cavity 602. The baffle 8 includes a first plate 801 and a second plate 802. The first plate 801 is located on the upper side of the second plate 802. The first plate 801 and the second plate 802 are fixedly connected, and the position where the first plate 801 and the second plate 802 meet is rotatably installed with the sealing plate 7. The length of the first plate 801 is greater than the length of the second plate 802, and the length of the second plate 802 is greater than the height of the sand discharge port 701. A torsion spring is provided at the hinge position between the baffle 8 and the sealing plate 7. In the absence of wind, the baffle 8 forms an acute angle with the sealing plate 7 under the action of the torsion spring, and the lower end of the second plate 802 extends to the rear side of the sealing plate 7.

[0031] Working principle: When the train passes through at high speed, it generates a high-speed airflow. This high-speed airflow first enters the second cavity 302. Since the second cavity 302 is shaped like a trumpet with a larger front and a smaller rear, and has a second guide plate 6 with a V-shaped cross section inside, the high-speed airflow will be diverted and accelerated by the second guide plate 6 in the second cavity 302. After being diverted and accelerated by the second guide plate 6, the airflow enters the air inlet cavity 602 through the through holes 601 with isolation nets 10 on the upper and lower sides. The isolation nets 10 can effectively intercept larger particles in the airflow, such as sand and stones, to prevent these particles from entering the air inlet cavity 602 and blocking the air duct 5 or damaging the subsequent air duct 101 and air outlet 102.

[0032] When airflow enters the air inlet cavity 602, some sand and other impurities will settle downwards due to gravity. In the absence of wind, the baffle 8 forms an acute angle with the sealing plate 7 under the action of the torsion spring, and the lower end of the second plate 802 extends to the rear side of the sealing plate 7. Sand and other impurities can then be discharged through the sand discharge port 701, preventing them from accumulating in the air inlet cavity 602 and affecting airflow and normal equipment operation. When a train passes by and generates high-speed airflow, the high-speed airflow acts on the front side of the baffle 8. Since the length of the first plate 801 is greater than the length of the second plate 802, the thrust of the high-speed airflow on the first plate 801 is greater than the thrust on the second plate 802. The baffle 8 rotates along the hinge point with the sealing plate 7 until the rear side of the first plate 801 is in contact with the front side of the sealing plate 7. At this time, the second plate 802 closes the sand discharge port 701, thereby preventing the high-speed airflow from being discharged from the sand discharge port 701 and ensuring that all the high-speed airflow entering the air inlet cavity 602 can enter the air duct 101 through the air guide pipe 5.

[0033] After the airflow enters the air duct 101, the high-speed airflow is guided by a barrier strip 901 and a guide block 902 on the inner side wall of the upper end of the buckle plate 9. When the airflow reaches the air outlet, the V-shaped structure on the rear side of the guide block 902 can converge and guide the airflow, making the airflow more concentrated towards the air outlet. The arc-shaped surface at the front end of the guide block 902 is equidistant from the arc-shaped surface at the rear end of the barrier strip 901, and the left and right ends are flush with the front end of the camera body 1. This ensures that the airflow flows out evenly at the air outlet, forming a stable and wide-coverage air curtain barrier. At the same time, the special shape design of the barrier strip 901 allows the airflow to smoothly split to both sides along the arc-shaped surface after impact, avoiding direct impact on the front end of the camera body 1, reducing airflow turbulence and eddy currents, and further reducing the impact of the airflow on the lens. Moreover, when a small amount of sand or impurities move with the airflow, the chamfer on the barrier strip 901 can play a certain guiding role, preventing the sand or impurities from directly hitting the lens.

[0034] Furthermore, a filter screen 11 is installed at one end of the air duct 5 extending into the air inlet cavity 602. The filter screen 11 can further intercept and filter small particles in the airflow, ensuring that the airflow entering the air duct 101 is cleaner. This prevents small particles from accumulating over a long period and causing wear on the inner wall of the air duct 101, or from being ejected from the air outlet 102 and adhering to the lens surface, thus affecting the imaging quality of the camera. The magnetic block 12 installed at the front of the air inlet cavity 602 can use its own magnetism to attract metal particles in the airflow, preventing these metal particles from entering the subsequent air duct 101 and air outlet 102, thus avoiding wear on the inner wall of the air duct 101 or blockage of the air outlet 102. Finally, the formed air curtain barrier can more effectively block stones, dust, and rainwater kicked up by the train from directly impacting the lens, providing protection for the lens of the camera body 1, ensuring that the camera can work continuously and stably in the complex rail transit environment, and meeting the operation and maintenance requirements of rail transit.

[0035] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

Claims

1. A camera for audio and video image acquisition and early warning in rail transit, comprising a camera body (1), an audio and video processor (2), and a mounting frame (3), wherein the audio and video processor (2) is fixedly installed in the mounting frame (3), and the camera body (1) is fixedly connected to the side wall of the mounting frame (3), characterized in that, The mounting frame (3) is vertically equipped with a first guide plate (4), which divides the mounting frame (3) into a first cavity (301) and a second cavity (302). The audio and video processor (2) is fixedly installed in the first cavity (301). The front and rear ends of the first cavity (301) are closed. The second cavity (302) is shaped like a horn, wider at the front and narrower at the back. The upper side of the camera body (1) is provided with a duct (101) that runs through both the front and rear sides. The front end of the duct (1) is provided with an air outlet (102), the air outlet (102) faces downward, and the air outlet (102) is located on the front side of the camera body (1). The width of the air outlet (102) is greater than the width of the camera element inside the camera body (1). The rear end of the air duct (101) is provided with a guide pipe (5). The end of the guide pipe (5) away from the camera body (1) extends into the second cavity (302) and is located on the rear side of the second cavity (302).

2. The audio and video image acquisition and early warning camera for rail transit according to claim 1, characterized in that, The second cavity (302) is provided with a second guide plate (6). The two sides of the second guide plate (6) are respectively attached to the side wall of the first guide plate (4) and the inner side wall of the mounting frame (3). The cross-section of the second guide plate (6) is V-shaped. The opening of the second guide plate (6) faces the rear. The second guide plate (6) divides the second cavity (302) into a first compression cavity (3021) and a second compression cavity (3022). The first compression cavity ( 3021) is located on the upper side of the second compression chamber (3022). The first compression chamber (3021) and the second compression chamber (3022) have the same volume. The second guide plate (6) has through holes (601) on both the upper and lower inclined surfaces. The second guide plate (6) has a sealing plate (7) at the rear end. The sealing plate (7) seals the second guide plate (6) into an air inlet chamber (602). The air guide pipe (5) extends into the air inlet chamber (602).

3. The audio and video image acquisition and early warning camera for rail transit according to claim 2, characterized in that, The sealing plate (7) has a sand discharge port (701) extending through both the front and rear sides on its lower side. A baffle (8) is rotatably installed on the side of the sealing plate (7) facing the air inlet cavity (602). The baffle (8) includes a first plate (801) and a second plate (802). The first plate (801) is located on the upper side of the second plate (802). The first plate (801) and the second plate (802) are fixedly connected, and the first plate (801) and the second plate (802) are... 2) The joint position is rotated and installed with the sealing plate (7). The length of the first plate (801) is greater than the length of the second plate (802). The length of the second plate (802) is greater than the height of the sand discharge port (701). A torsion spring is provided at the hinge position of the baffle (8) and the sealing plate (7). In the windless state, the baffle (8) forms an acute angle with the sealing plate (7) under the action of the torsion spring, and the lower end of the second plate (802) extends to the rear side of the sealing plate (7).

4. The audio and video image acquisition and early warning camera for rail transit according to claim 1, characterized in that, The camera body (1) is provided with a buckle plate (9). The cross-section of the buckle plate (9) is U-shaped with the opening facing downwards. The inner sidewall of the buckle plate (9) and the upper end face of the camera body (1) form an air duct (101). The upper inner sidewall of the buckle plate (9) is provided with a barrier strip (901). The barrier strip (901) is located on the front side of the buckle plate (9). The lower end of the barrier strip (901) extends to the lower side of the upper end face of the camera body (1) by 2-5 mm. The vertical projection of the barrier strip (901) is an arc shape with the opening facing the rear side. The lower end of the rear side of the barrier strip (901) is provided with a chamfer. The bevel of the chamfer is at a 3° to 10° angle to the front end face of the camera body (1).

5. A video and audio image acquisition and early warning camera for rail transit according to claim 4, characterized in that, The upper inner wall of the buckle plate (9) is provided with a guide block (902). The lower end face of the guide block (902) is in contact with the upper end face of the camera body (1). The rear side of the guide block (902) is V-shaped and the front end is arc-shaped. The rear side wall of the barrier strip (901) and the front side wall of the guide block (902) form an air outlet. The arc-shaped surface at the front end of the guide block (902) is equidistant from the arc-shaped surface at the rear side of the barrier strip (901). The left and right ends of the arc-shaped surface at the front end of the guide block (902) are flush with the front end face of the camera body (1).

6. A video and audio image acquisition and early warning camera for rail transit according to claim 2, characterized in that, An isolation net (10) is provided in the passage hole (601) on both the upper and lower sides. The upper surface of the isolation net (10) on the upper side is flush with the upper side of the second guide plate (6), and the lower surface of the isolation net (10) on the lower side is flush with the lower side of the second guide plate (6).

7. A video and audio image acquisition and early warning camera for rail transit according to claim 6, characterized in that, The air duct (5) extends into the air inlet cavity (602) and is equipped with a filter screen (11), which is fixedly connected to the opening of the air duct (5).

8. A video and audio image acquisition and early warning camera for rail transit according to claim 6, characterized in that, A magnetic block (12) is provided on the front side of the air inlet cavity (602). The magnetic block (12) is fixedly connected to the second guide plate (6), and the front and rear projections of the magnetic block (12) and the two through holes (601) do not overlap.

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