A point-type combustible gas detector field detection device and method

Abstract

The application provides a point-type combustible gas detector field detection device and method, and belongs to the technical field of gas detector detection. The point-type combustible gas detector field detection device and method comprise a detector body and a telescopic rod, the top of the telescopic rod is hingedly connected with a detection cylinder, the inside of the detection cylinder is provided with a state detection mechanism, the state detection mechanism comprises a top cylinder and a push-pull electromagnet, the top cylinder is fixedly arranged in the inside of the detection cylinder, and the top of the top cylinder is provided with an opening. The state detection mechanism is arranged, when the detection head normally works, the standard gas is subjected to flameless combustion under the action of a catalyst and generates a resistance step, so that the green light on the outer wall of the detection cylinder is turned on; if the standard gas does not normally combust, no resistance change is generated, the push-pull electromagnet does not work, and the red light microswitch and the red light electrically connected with the outer wall of the detection cylinder are arranged, so that the red light is turned on.

Description

Technical Field

[0001] This invention relates to the field of gas detector detection technology, and more specifically, to a point-type combustible gas detector field detection device and method. Background Technology

[0002] Point-type combustible gas detectors are widely used in industrial and civil applications such as petrochemicals, metallurgy, and gas pipelines. Their core detection element often uses a catalytic combustion sensor. This sensor relies on an internal catalyst to cause flameless combustion of combustible gas at a lower temperature. The gas concentration is determined by measuring the change in platinum wire resistance caused by the oxidative heat generated during combustion. In daily inspection and maintenance, it is necessary to periodically test the detectors installed on-site with standard gas to verify whether their alarm function is normal. The current on-site testing method usually involves the testing personnel holding a long pole or climbing a ladder to spray standard gas directly onto the outside of the detector's explosion-proof mesh cover using a gas cylinder and a gas delivery pipe, and then observing whether the detector sounds an alarm.

[0003] However, open-type jet detection is easily affected by environmental airflow such as wind direction and speed, which can dilute the standard gas. This not only wastes the standard gas but also easily leads to false alarms due to decreased detector sensitivity. When the detector does not alarm, existing tools cannot further diagnose the cause of the fault. Catalytic combustion detector failures are usually classified as chemical failures (catalyst poisoning or aging) and physical failures (explosion-proof mesh is severely blocked by oil or dust, preventing gas from entering). Existing technology can only conclude that no alarm is triggered, leading maintenance personnel to blindly replace the entire detector head, increasing maintenance costs and masking the true impact of dirty on-site environments on the equipment. Summary of the Invention

[0004] To overcome the above deficiencies, the present invention provides a point-type combustible gas detector field detection device and method to overcome or at least partially solve the above technical problems.

[0005] This invention is implemented as follows: This invention provides a point-type combustible gas detector on-site detection device, including a detector body and a telescopic rod. A detection cylinder is hinged to the top of the telescopic rod, and a status detection mechanism is disposed inside the detection cylinder. The status detection mechanism includes… A top cylinder is fixed inside the detection cylinder. The top of the top cylinder is open. Several grooves are formed on the inner wall of the top cylinder. A sealing plate is slidably arranged in a circular array inside the top cylinder. A slider is fixed at the bottom of the sealing plate and is slidably arranged inside the groove. A push-pull electromagnet is provided, which is disposed on the inner bottom wall of the detection cylinder. The output end of the push-pull electromagnet is provided with a contact block. A trigger rod is slidably disposed inside the contact block. A first spring is disposed between the trigger rod and the contact block. An output rod is slidably disposed on the inner wall of the detection cylinder.

[0006] In a preferred embodiment, the inside of the detection cylinder is provided with a drive dial, which has several arc-shaped grooves. The top of the sealing plate is fixed with a sliding shaft, which is slidably sleeved inside the arc-shaped grooves. The bottom of the top cylinder is fixed with a middle cylinder, and a connecting hole is provided between the middle cylinder and the top cylinder. A valve is slidably provided inside the middle cylinder, and two one-way valves are provided on the middle cylinder.

[0007] In a preferred embodiment, a bottom cylinder is fixedly provided at the bottom of the middle cylinder, and a hydraulic rod is provided on the inner top wall of the bottom cylinder. The output end of the hydraulic rod is connected to a piston. A limiting rod is fixedly provided inside the bottom cylinder. A first sliding plate and a second sliding plate are slidably provided on the surface of the limiting rod. The first sliding plate is located below the second sliding plate. A first connecting rod is fixedly provided between the first sliding plate and the piston.

[0008] In a preferred embodiment, a second connecting rod is fixedly mounted on the bottom of the second slide, a drive frame is fixedly mounted on the second connecting rod, and a second spring is provided between the drive frame and the bottom cylinder.

[0009] In a preferred embodiment, a support frame is fixedly provided on the inner wall of the detection cylinder, a threaded rod is rotatably provided on the top of the support frame, the support frame is threaded onto the surface of the threaded rod, a support plate is coaxially fixed on the surface of the support frame, and a pawl is hinged on the support plate.

[0010] In a preferred embodiment, an escape fork is hinged to the support frame, an escape wheel is rotatably mounted on the support frame, a ratchet is coaxially fixed to the top of the escape wheel, and an eccentric rod is coaxially fixed to the bottom of the escape wheel.

[0011] In a preferred embodiment, the top cylinder is provided with a blockage detection mechanism, the blockage detection mechanism including a first receiving cylinder, a detection rod slidably disposed inside the first receiving cylinder, one end of the detection rod penetrating to the outer wall of the top cylinder, a detection needle slidably disposed inside the detection rod, and a third spring disposed between the detection rod and the detection needle.

[0012] In a preferred embodiment, a third connecting rod is fixedly mounted on the top of the second sliding plate, and a connecting ring is fixedly mounted on the top of the third connecting rod. A connecting rod is provided between the connecting ring and the detection rod, one end of the connecting rod is hinged to the detection rod, and the other end of the connecting rod is hinged to the connecting ring.

[0013] In a preferred embodiment, a second receiving cylinder is fixedly provided on the inner wall of the top cylinder, a positioning rod is slidably provided inside the second receiving cylinder, a wedge is fixedly provided at one end of the positioning rod near the detector body, and a fourth spring is provided between the positioning rod and the inner wall of the second receiving cylinder.

[0014] A method for on-site detection of a point-type combustible gas detector, applied to an on-site detection device for a point-type combustible gas detector. S1. Constructing a sealed space: Extend the telescopic rod so that the inner bottom wall of the top cylinder abuts against the bottom of the detector head of the detector body. Simultaneously move several sealing plates radially toward the central axis of the top cylinder to form a sealed space between the top cylinder and the detector head. S2, Standard Gas Injection and Signal Acquisition: Standard gas is introduced into the top cylinder, and the electrical signal of the probe head is acquired through the power probe and transmitted to the amplifier circuit board; S3. Working status determination: If the probe is working normally, the standard gas continues to burn and generate resistance. With the help of the amplifier circuit board, the push-pull electromagnet is activated, which moves the receiving block downward and makes the green light light up. If the standard gas does not burn normally and no resistance is generated, the push-pull electromagnet does not work. The eccentric rod squeezes the drive rod, which in turn squeezes the output rod, triggering the red light to light up.

[0015] The present invention provides a point-type combustible gas detector field detection device and method, the beneficial effects of which include: 1. By setting up a status detection mechanism, when the probe is working normally, the standard gas undergoes flameless combustion under the action of the catalyst and generates a resistance step, causing the green light on the outer wall of the detection cylinder to light up. If the standard gas does not burn normally, no resistance change is generated, the push-pull electromagnet does not work, the eccentric rod squeezes the drive rod, causing the drive rod to squeeze the output rod, and the output rod touches the red light micro switch set on the inner wall of the detection cylinder. The red light micro switch is electrically connected to the red light set on the outer wall of the detection cylinder, and the red light lights up at this time.

[0016] 2. By setting up a blockage detection mechanism, when the valve moves upward, the detection rod drives the detection needle to move closer to the probe head. When the detection hole on the probe head is not blocked, the relative distance between the detection needle and the detection rod will not change. When the detection hole on the probe head is blocked, the relative distance between the detection rod and the detection needle changes. The displacement sensors set on both detect this relative displacement and output an electrical signal. At this time, the yellow light will illuminate, thus further detecting the blockage of the detection hole when the standard gas does not burn normally, avoiding the common assumption that the detector is not working properly due to catalyst aging. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of the detection cylinder and the detector body is provided for embodiments of the present invention; Figure 3 Exploded views of the top tube and the detector body are provided for embodiments of the present invention; Figure 4 A partial cross-sectional view of the detection cylinder is provided for embodiments of the present invention; Figure 5 An exploded view of the drive dial and the top cylinder is provided for embodiments of the present invention; Figure 6 Partial cross-sectional views of the top cylinder, middle cylinder, and bottom cylinder are provided for embodiments of the present invention; Figure 7 A partial cross-sectional view of the first and second receiving cylinders is provided for embodiments of the present invention; Figure 8 A schematic diagram of the structure of the first and second skateboards is provided for embodiments of the present invention; Figure 9 A schematic diagram of the escapement fork and escapement wheel is provided for embodiments of the present invention; Figure 10 A schematic diagram of the drive rod and output rod is provided for embodiments of the present invention.

[0019] In the diagram: 1. Detector body; 2. Telescopic rod; 3. Detection cylinder; 401. Top cylinder; 402. Slide groove; 403. Sealing plate; 404. Slider; 405. Push-pull electromagnet; 406. Contact block; 407. Trigger rod; 408. First spring; 409. Output rod; 410. Drive dial; 411. Arc groove; 412. Sliding shaft; 413. Middle cylinder; 414. Connecting hole; 415. Bolt; 416. Check valve; 417. Bottom cylinder; 418. Hydraulic rod; 419. Limiting rod; 420. First sliding plate; 421. Second sliding plate; 4 22. First connecting rod; 423. Second connecting rod; 424. Drive frame; 425. Second spring; 426. Bearing frame; 427. Threaded rod; 428. Bearing plate; 429. Pawl; 430. Escape fork; 431. Escape wheel; 432. Ratchet; 433. Eccentric rod; 501. First receiving cylinder; 502. Detection rod; 503. Detection needle; 504. Third spring; 505. Third connecting rod; 506. Connecting ring; 507. Connecting rod; 508. Second receiving cylinder; 509. Positioning rod; 510. Wedge; 511. Fourth spring. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0021] Reference Figures 1-10This invention provides a technical solution: a point-type combustible gas detector on-site detection device and method, including a detector body 1 and a telescopic rod 2. A detection cylinder 3 is hinged to the top of the telescopic rod 2. A state detection mechanism is provided inside the detection cylinder 3. The state detection mechanism includes a top cylinder 401 and a push-pull electromagnet 405. The top cylinder 401 is fixed inside the detection cylinder 3. The top of the top cylinder 401 is open. Several sliding grooves 402 are formed on the inner wall of the top cylinder 401. A sealing plate 403 is slidably arranged in a circular array inside the top cylinder 401. A slider 404 is fixed at the bottom of the sealing plate 403 and slidably arranged inside the sliding grooves 402. The push-pull electromagnet 405 is arranged on the inner bottom wall of the detection cylinder 3. The output end of the electromagnet 405 is provided with a contact block 406. A trigger rod 407 is slidably arranged inside the contact block 406. A first spring 408 is arranged between the trigger rod 407 and the contact block 406. An output rod 409 is slidably arranged on the inner wall of the detection cylinder 3. A green light micro switch is fixed on the inner wall of the detection cylinder 3. The green light micro switch is electrically connected to a green indicator light on the outer wall of the detection cylinder 3. The end of the trigger rod 407 is positioned directly above the green light micro switch. A power-taking probe is arranged inside the top cylinder 401. The output end of the power-taking probe is connected to an amplification circuit board. The output end of the amplification circuit board is electrically connected to the push-pull electromagnet 405. When the sealing plate 403 slides radially, it finally contacts the probe of the detector body 1. When the probes come into contact, the sealing plate 403 forms a sealed space in the top cylinder 401. At this time, standard gas is introduced into the top cylinder 401. Under normal operating conditions, the detector body 1 continuously burns the standard gas, generating a change in resistance due to oxidative heat. This causes the push-pull electromagnet 405 to actuate, moving the contact block 406 downwards. The trigger rod 407 then presses down against the green light microswitch, illuminating the green light on the outer wall of the detection cylinder 3. Through the established status detection mechanism, after the user arrives at the testing site, they extend the telescopic rod 2 so that the inner bottom wall of the top cylinder 401 rests against the bottom of the probe. Simultaneously, several sealing plates 403 are moved radially towards the central axis of the top cylinder 401, causing the top cylinder 401 and... A sealed space is formed between the probes. At this time, standard gas is supplied to the inside of the top cylinder 401. When the probe is working normally, the standard gas undergoes flameless combustion under the action of the catalyst and generates a resistance step. Through the cooperation of the power probe and the amplification circuit board, the push-pull electromagnet 405 drives the contact block 406 to move downward, and at the same time, the green light on the outer wall of the detection cylinder 3 lights up. If the standard gas does not burn normally and no resistance change is generated, the push-pull electromagnet 405 does not work, and the eccentric rod 433 squeezes the drive rod, which squeezes the output rod 409. The output rod 409 touches the red light micro switch set on the inner wall of the detection cylinder 3. The red light micro switch is electrically connected to the red light set on the outer wall of the detection cylinder 3, and the red light lights up at this time. Reference Figures 1-10Inside the detection cylinder 3, a drive dial 410 is rotatably mounted via a central shaft. The drive dial 410 has several arc-shaped grooves 411. A sliding shaft 412 is fixedly mounted on the top of the sealing plate 403, and the sliding shaft 412 is slidably fitted inside the arc-shaped grooves 411. A middle cylinder 413 is fixedly mounted at the bottom of the top cylinder 401, and a connecting hole 414 is provided between the middle cylinder 413 and the top cylinder 401. A valve 415 is slidably mounted inside the middle cylinder 413. Two one-way valves 416 are mounted on the middle cylinder 413, with the valve discs of the two one-way valves facing opposite directions. One of the one-way valves 416 is connected to an air pipe for supplying standard gas into the middle cylinder 413. A toothed ring is coaxially mounted on the surface of the drive dial 410. A drive motor is fixedly installed on the inner wall of cylinder 3 via a motor mount. A transmission gear is fixed on the output shaft of the drive motor. The transmission gear meshes with the gear ring and is driven to rotate by the motor and gear. A one-way check valve is installed inside the connecting hole 414. By setting a drive dial 410, the drive dial 410 is rotated, so that the inner wall of the arc groove 411 squeezes the sliding shaft 412. Under the limiting cooperation of the sliding groove 402 and the slider 404, the sealing plate 403 moves radially towards the central axis of the top cylinder 401. After completion, the hydraulic rod 418 is activated to move the valve 415 upward, so that the standard gas inside the valve 415 enters the interior of the top cylinder 401 through the connecting hole 414. Reference Figures 1-10A bottom cylinder 417 is fixedly installed at the bottom of the middle cylinder 413. A hydraulic rod 418 is fixedly installed on the inner top wall of the bottom cylinder 417 via a flange. The output end of the hydraulic rod 418 is connected to a piston 415. A limiting rod 419 is fixedly installed inside the bottom cylinder 417. A first sliding plate 420 and a second sliding plate 421 are slidably installed on the surface of the limiting rod 419. The first sliding plate 420 is located below the second sliding plate 421. A first connecting rod 422 is fixedly installed between the first sliding plate 420 and the piston 415. A second connecting rod 423 is fixedly installed at the bottom of the second sliding plate 421. A drive frame 424 is fixedly installed on the second connecting rod 423. A second spring 425 is installed between the drive frame 424 and the bottom cylinder 417. The inner wall of the detection cylinder 3 is connected by a mounting bracket. A support frame 426 is fixedly provided. A threaded rod 427 is rotatably mounted on the top of the support frame 426 via a thrust bearing. The support frame 426 is threaded onto the surface of the threaded rod 427. A support plate 428 is coaxially fixed to the surface of the support frame 426. A pawl 429 is hinged to the support plate 428. A torsion spring is provided between the pawl 429 and the support plate 428. An escape fork 430 is hinged to the support frame 426. An escape wheel 431 is rotatably mounted on the support frame 426 via a one-way bearing. A ratchet 432 is coaxially fixed to the top of the escape wheel 431, and an eccentric rod 433 is coaxially fixed to the bottom of the escape wheel 431. The escape fork 430 reciprocates via a hairspring assembly. This is prior art and will not be described in detail here. The support frame 426... A drive rod is slidably inserted into the side wall of component 6. Through the arrangement of the escape fork 430 and escape wheel 431, when the piston 415 moves upward, it drives the first slide plate 420 upward via the first connecting rod 422. At this time, the first slide plate 420 and the second slide plate 421 abut against each other. The second slide plate 421 drives the drive frame 424 upward via the second connecting rod 423. Through the threaded connection between the drive frame 424 and the threaded rod 427, the threaded rod 427 drives the bearing plate 428 to rotate. After the pawl 429 on the bearing plate 428 is pressed against the ratchet 432, the pawl 429 rotates itself, while the ratchet 432 remains stationary. After the standard gas is delivered into the top cylinder 401, the hydraulic rod 418 is activated in reverse, causing the piston 415 to move upward. Returning to its original position, and now freed from the pressure of the first slide plate 420, the second slide plate 421 moves downward under the restoring force of the second spring 425. The drive frame 424 drives the threaded rod 427 to rotate in the opposite direction. At this time, the pawl 429 and the ratchet teeth on the ratchet wheel 432 abut against each other, causing the ratchet wheel 432 to rotate. The ratchet wheel 432 drives the escape wheel 431 to rotate. With the cooperation of the escape fork 430 and the hairspring assembly, the time for the escape wheel 431 to rotate one revolution is fixed according to the preset time. At the same time, the escape wheel 431 drives the eccentric rod 433 to rotate. When the standard gas does not burn normally, the push-pull electromagnet 405 does not work, the eccentric rod 433 squeezes the drive rod, and the drive rod squeezes the output rod 409, causing the red light to illuminate. Reference Figures 1-10A blockage detection mechanism is provided on the top cylinder 401. The blockage detection mechanism includes a first receiving cylinder 501. A detection rod 502 is slidably disposed inside the first receiving cylinder 501. One end of the detection rod 502 extends through the outer wall of the top cylinder 401. A detection needle 503 is slidably disposed inside the detection rod 502. A third spring 504 is disposed between the detection rod 502 and the detection needle 503. The detection needle 503 and the first mounting cylinder are in a sliding sealing fit. A high-precision miniature displacement sensor is fixedly installed on the side wall of the detection rod 502. The detection end of the displacement sensor abuts against the side wall of the detection needle 503. The displacement sensor is electrically connected to a yellow indicator light disposed on the outer wall of the detection cylinder 3. A blockage detection mechanism is set up so that when the valve 415 moves upward, the detection rod 502 causes the detection needle 503 to move closer to the probe head. When the detection hole on the probe head is not blocked, the relative distance between the detection needle 503 and the detection rod 502 will not change. When the detection hole on the probe head is blocked, the relative distance between the detection rod 502 and the detection needle 503 changes. The displacement sensors set on both of them capture the relative displacement and output an electrical signal. At this time, the yellow light will light up, so that when the standard gas does not burn normally, the blockage of the detection hole is further detected, avoiding the common assumption that the detector is not working properly due to catalyst aging. Reference Figures 1-10 A third connecting rod 505 is fixedly mounted on the top of the second sliding plate 421. A connecting ring 506 is fixedly mounted on the top of the third connecting rod 505. A connecting rod 507 is provided between the connecting ring 506 and the detection rod 502. One end of the connecting rod 507 is hinged to the detection rod 502, and the other end of the connecting rod 507 is hinged to the connecting ring 506. A second receiving cylinder 508 is fixedly mounted on the inner wall of the top cylinder 401. A positioning rod 509 is slidably mounted inside the second receiving cylinder 508. The positioning rod 509 and the second receiving cylinder 508 are slidably sealed together. A wedge block 510 is fixedly mounted on the end of the positioning rod 509 near the detector body 1. A fourth spring 511 is provided between the inner wall of the second receiving cylinder 508 and the inner wall of the second receiving cylinder 508. By setting a wedge block 510, the user can rotate the telescopic rod 2 after the inner bottom wall of the top cylinder 401 is abutted against the bottom of the probe head. This allows the wedge block 510 to enter the interior of one of the probe holes, thereby positioning all the probe needles 503 and ensuring that the probe needles 503 will not touch the solid metal part of the outer wall of the probe head when they move, thus preventing misjudgment. When the piston 415 moves upward, the connecting ring 506 moves upward through the third connecting rod 505. Through the cooperation of the connecting rod 507, several probe needles 502 move radially at the same time. A method for on-site detection of a point-type combustible gas detector, applied to an on-site detection device for a point-type combustible gas detector. S1. Constructing a sealed space: Extend the telescopic rod 2 so that the inner bottom wall of the top cylinder 401 abuts against the bottom of the detector head of the detector body 1, and move several sealing plates 403 radially towards the central axis of the top cylinder 401 at the same time, so that a sealed space is formed between the top cylinder 401 and the detector head. S2, Standard gas injection and signal acquisition: Standard gas is delivered into the top cylinder 401, and the electrical signal of the probe head is acquired through the power probe and transmitted to the amplifier circuit board; S3. Working status determination: If the probe is working normally, the standard gas continues to burn and generates resistance. With the cooperation of the amplifier circuit board, the push-pull electromagnet 405 is activated, which moves the receiving block downward and makes the green light light up. If the standard gas does not burn normally and no resistance is generated, the push-pull electromagnet 405 does not work. The eccentric rod 433 squeezes the drive rod, which squeezes the output rod 409. The output rod 409 triggers the red light to light up.

[0022] Specifically, the working process or working principle of this point-type combustible gas detector field detection device and method is as follows: When in use, after the user arrives at the detection site, the user extends the telescopic rod 2 so that the inner bottom wall of the top cylinder 401 abuts against the bottom of the detector head of the detector body 1, and rotates the telescopic rod 2 so that the wedge 510 is engaged in the detection hole to complete the positioning. The drive motor is started, and the motor drives the drive dial 410 to rotate through the transmission gear, so that the inner wall of the arc groove 411 squeezes the sliding shaft 412. Under the limiting cooperation of the sliding groove 402 and the slider 404, several sealing plates 403 are driven to move synchronously radially towards the central axis of the top cylinder 401. The top cylinder 401 moves until it makes close contact with the probe head, creating a sealed space between the top cylinder 401 and the probe head that is not affected by external airflow. During the movement of the sealing plate 403, the detection rod 502 is driven by the connecting rod 507 to move the detection needle 503 toward the probe head. If the detection hole is blocked by oil, the detection needle 503 will be blocked by hard dirt and will not be able to penetrate the mesh. The detection needle 503 will be forced to retract and compress the third spring 504. The displacement sensor will capture the relative displacement and trigger the yellow indicator light to illuminate, indicating physical blockage. The hydraulic rod 418 will be activated to drive the piston 415 to move upward, forcing the standard gas in the middle cylinder 413 into the sealed top cylinder 4 through the connecting hole 414. Inside 01, as the piston 415 moves upward, the first connecting rod 422 drives the first slide plate 420 to move upward and press against the second slide plate 421. The second slide plate 421 drives the drive frame 424 to move upward, and the threaded rod 427 drives the bearing plate 428 to rotate, so that the pawl 429 slides over the ratchet 432 to complete the winding and energy storage of the mechanical countdown timer. After the standard gas is injected, the hydraulic rod 418 is activated in reverse to reset the piston 415. At this time, the second spring 425 releases its rebound force to drive the second slide plate 421 to move downward. The drive frame 424 drives the threaded rod 427 to rotate in reverse. The pawl 429 locks the ratchet 432, driving the escape wheel 431 to move downward under the speed regulation of the hairspring assembly. During a constant-speed countdown rotation, if the catalytic element inside the probe is healthy and not blocked, the standard gas undergoes catalytic combustion, causing a change in the resistance of the platinum wire. The amplification circuit board receives the signal from the power-taking probe and controls the push-pull electromagnet 405 to move, causing the contact block 406 to move down and press the green light micro switch, so that the green indicator light lights up before the end of the countdown, indicating that the probe is healthy. If the standard gas does not burn normally (catalyst aging), the push-pull electromagnet 405 does not move. When the escape wheel 431 finishes its countdown rotation, the eccentric rod 433 at its bottom squeezes the drive rod, and the drive rod further pushes the output rod 409 to touch the red light micro switch, so that the red indicator light lights up.

Claims

1. A point-type combustible gas detector field detection device, comprising a detector body (1) and a telescopic rod (2), characterized in that: The top of the telescopic rod (2) is hinged to a detection cylinder (3), and a state detection mechanism is provided inside the detection cylinder (3). The state detection mechanism includes, A top cylinder (401) is fixed inside the detection cylinder (3). The top of the top cylinder (401) is open. The inner wall of the top cylinder (401) is provided with a plurality of sliding grooves (402). A sealing plate (403) is slidably arranged in a ring array inside the top cylinder (401). A slider (404) is fixedly provided at the bottom of the sealing plate (403). The slider (404) is slidably arranged inside the sliding groove (402). A push-pull electromagnet (405) is provided on the inner bottom wall of the detection cylinder (3). A contact block (406) is provided at the output end of the push-pull electromagnet (405). A trigger rod (407) is slidably provided inside the contact block (406). A first spring (408) is provided between the trigger rod (407) and the contact block (406). An output rod (409) is slidably provided on the inner wall of the detection cylinder (3).

2. The point-type combustible gas detector field detection device according to claim 1, characterized in that, The detection cylinder (3) is equipped with a drive dial (410) that rotates inside. The drive dial (410) has several arc-shaped grooves (411). The top of the sealing plate (403) is fixed with a sliding shaft (412), which slides inside the arc-shaped grooves (411). The bottom of the top cylinder (401) is fixed with a middle cylinder (413). A connecting hole (414) is provided between the middle cylinder (413) and the top cylinder (401). A valve (415) is slidably provided inside the middle cylinder (413). Two one-way valves (416) are provided on the middle cylinder (413).

3. The point-type combustible gas detector field detection device according to claim 2, characterized in that, The bottom of the middle cylinder (413) is fixedly provided with a bottom cylinder (417). A hydraulic rod (418) is provided on the inner top wall of the bottom cylinder (417). The output end of the hydraulic rod (418) is connected to the piston (415). A limiting rod (419) is fixedly provided inside the bottom cylinder (417). A first sliding plate (420) and a second sliding plate (421) are slidably provided on the surface of the limiting rod (419). The first sliding plate (420) is located below the second sliding plate (421). A first connecting rod (422) is fixedly provided between the first sliding plate (420) and the piston (415).

4. The point-type combustible gas detector field detection device according to claim 3, characterized in that, The bottom of the second slide (421) is fixed with a second connecting rod (423), and a drive frame (424) is fixed on the second connecting rod (423). A second spring (425) is provided between the drive frame (424) and the bottom cylinder (417).

5. The point-type combustible gas detector field detection device according to claim 1, characterized in that, The inner wall of the detection cylinder (3) is fixedly provided with a support frame (426), and a threaded rod (427) is rotatably provided on the top of the support frame (426). The support frame (426) is threaded onto the surface of the threaded rod (427). A support plate (428) is coaxially fixed on the surface of the support frame (426), and a pawl (429) is hinged on the support plate (428).

6. The point-type combustible gas detector field detection device according to claim 5, characterized in that, An escapement fork (430) is hinged on the support frame (426), and an escapement wheel (431) is rotatably mounted on the support frame (426). A ratchet (432) is coaxially fixed to the top of the escapement wheel (431), and an eccentric rod (433) is coaxially fixed to the bottom of the escapement wheel (431).

7. The point-type combustible gas detector field detection device according to claim 3, characterized in that, A blockage detection mechanism is provided on the top cylinder (401). The blockage detection mechanism includes a first receiving cylinder (501). A detection rod (502) is slidably arranged inside the first receiving cylinder (501). One end of the detection rod (502) extends through the outer wall of the top cylinder (401). A detection needle (503) is slidably arranged inside the detection rod (502). A third spring (504) is provided between the detection rod (502) and the detection needle (503).

8. The point-type combustible gas detector field detection device according to claim 7, characterized in that, The top of the second slide plate (421) is fixedly provided with a third connecting rod (505), the top of the third connecting rod (505) is fixedly provided with a connecting ring (506), a connecting rod (507) is provided between the connecting ring (506) and the detection rod (502), one end of the connecting rod (507) is hinged to the detection rod (502), and the other end of the connecting rod (507) is hinged to the connecting ring (506).

9. The point-type combustible gas detector field detection device according to claim 1, characterized in that, The inner wall of the top cylinder (401) is fixedly provided with a second receiving cylinder (508), and a positioning rod (509) is slidably provided inside the second receiving cylinder (508). A wedge (510) is fixedly provided at one end of the positioning rod (509) near the detector body (1), and a fourth spring (511) is provided between the positioning rod (509) and the inner wall of the second receiving cylinder (508).

10. A method for on-site detection of a point-type combustible gas detector, applied to the on-site detection device for a point-type combustible gas detector as described in any one of claims 1-9, characterized in that, S1. Constructing a sealed space: Extend the telescopic rod (2) so that the inner bottom wall of the top cylinder (401) abuts against the bottom of the detector head of the detector body (1), and move several sealing plates (403) radially toward the central axis of the top cylinder (401) at the same time, so that a sealed space is formed between the top cylinder (401) and the detector head. S2, Standard gas injection and signal acquisition: Standard gas is delivered into the top cylinder (401), and the electrical signal of the probe is obtained through the power probe and transmitted to the amplifier circuit board; S3. Working status determination: If the probe is working normally, the standard gas continues to burn and generates resistance. With the cooperation of the amplifier circuit board, the push-pull electromagnet (405) is activated, which drives the receiving block to move downward, causing the green light to light up. If the standard gas does not burn normally and no resistance is generated, the push-pull electromagnet (405) does not work. The eccentric rod (433) squeezes the drive rod, causing the drive rod to squeeze the output rod (409), and the output rod (409) triggers the red light to light up.

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