A detection device for a fire detector

Abstract

The application relates to the technical field of alarm device detection, and discloses a detection device for a fire detector, which comprises a detection rod, an atomizer arranged at the top of the inner wall of the detection rod, and a covering mechanism arranged at one end of the detection rod close to the atomizer. The covering mechanism comprises a fixing ring arranged at one end of the detection rod close to the atomizer, a plurality of rotary arms arranged in an annular array outside the fixing ring, a plurality of rollers arranged at one end of the rotary arms away from the fixing ring, a plurality of latex films arranged in an annular array between two adjacent rotary arms, the two sides of the latex films being fixedly connected with the two adjacent rotary arms respectively, a plurality of sliding grooves symmetrically arranged at the top of the detection rod close to the fixing ring, a lifting plate arranged in the plurality of sliding grooves, an ejection spring arranged at the bottom of the lifting plate, and a plurality of connecting rods arranged in an annular array outside the lifting plate. The covering mechanism is arranged to cover the fire detector by a barrier, so that the smoke is prevented from being blown away, and the detection effect is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of alarm device testing technology, and in particular to a testing device for fire detectors. Background Technology

[0002] Fire detector testing devices are crucial tools for ensuring the reliable operation of automatic fire alarm systems. Their primary function is to conduct regular performance tests and functional verifications of various fire detectors. First, the device simulates real fire environments. For example, it can apply hot airflow to heat detectors via a heating unit, or release specific concentrations of smoke or gas to smoke detectors using optical or ionization simulation sources. By artificially creating triggering conditions, it verifies whether the detector can accurately sense and output an alarm signal within a specified time. Second, the testing device can evaluate the detector's sensitivity and response speed. During routine maintenance, this equipment can monitor the detector's threshold response to simulated signals, determining whether its sensitivity has decreased or increased due to dust accumulation, aging, or component damage, thus promptly eliminating faulty devices.

[0003] Traditional fire detectors are widely used in fire protection, but due to limitations in their structure and operating principles, they often suffer from several significant problems. Existing fire detectors employ a duct-based smoke extraction system, which has significant technical shortcomings in practical applications. These devices typically deliver smoke directly through a long, thin duct extending below the detector; however, this design is highly susceptible to environmental factors. First, airflow interference is a major cause of test failure. At the testing site, air conditioning or natural winds are often present, and even slight airflow can cause the smoke expelled from the duct to deviate before contacting the sensor, preventing it from entering the sampling chamber inside the detector and rendering the test invalid. Second, smoke dispersion reduces detection accuracy. Because smoke diffuses freely after exiting the duct, if the spray distance is not properly controlled or an effective envelope is not formed, the smoke will quickly dilute and dissipate. This not only forces operators to spray large doses for extended periods to build up concentration, causing response delays, but may also lead to false alarms by triggering other nearby detectors due to smoke diffusion. Finally, inaccurate spraying also poses a challenge to operation. Precise alignment between the top of the duct and the detector is difficult to achieve; even slight angular deviations can cause smoke loss. Therefore, this type of device, which relies on ducted smoke extraction, is insufficient in both stability and efficiency, and cannot meet the needs of accurate detection in complex environments. Summary of the Invention

[0004] In view of the problem that the existing detection device is easily affected by airflow interference, thus affecting the test results, a detection device for fire detectors is proposed.

[0005] Its purpose is to enable the detection device to create a barrier that blocks the airflow, prevents the smoke from dispersing, and ensures the detection effect.

[0006] The technical solution of the present invention is a detection device for fire detectors, including a detection rod, an atomizer disposed on the top of the inner wall of the detection rod, and a covering mechanism disposed on the end of the detection rod near the atomizer. The covering mechanism includes a fixed ring disposed at the end of the detection rod near the atomizer, several annular arrays of rotating arms disposed outside the fixed ring, rollers disposed at the ends of the rotating arms away from the fixed ring, several annular arrays of latex films disposed between two adjacent rotating arms, with both sides of the latex films fixedly connected to the two adjacent rotating arms respectively, symmetrically opened sliding grooves at the top of the detection rod near the fixed ring, lifting plates disposed within several sliding grooves, ejection springs disposed at the bottom of the lifting plates, several annular arrays of connecting rods disposed outside the lifting plates, with the ends of the connecting rods away from the lifting plates respectively rotatably connected to the corresponding rotating arms, a triggering unit disposed at the bottom of the lifting plates, and a smoke exhaust unit disposed at the bottom of the atomizer.

[0007] Furthermore, a movable groove is provided at the connection between the rotating arm and the connecting rod, and the inner wall of the movable groove is rotatably connected to the end of the connecting rod away from the lifting plate.

[0008] Furthermore, a retaining ring is provided on the inner wall of the detection rod near the fixed ring, and the top and bottom of the reset spring are fixedly connected to the retaining ring and the lifting plate, respectively.

[0009] Furthermore, the triggering unit includes a first locking block symmetrically arranged at the bottom of the lifting plate, a second locking block symmetrically arranged at the top of the retaining ring, a spring plate arranged at the bottom of the second locking block, the top and bottom ends of the spring plate being fixedly connected to the second locking block and the retaining ring respectively, a sleeve arranged at the top of the detection rod, a return spring sleeved at the bottom of the sleeve, the two ends of the return spring being fixedly connected to the sleeve and the atomizer respectively, pressure rods symmetrically arranged on both sides of the sleeve, the bottom end of the pressure rod penetrating the lifting plate and abutting against the second locking block, a long rod arranged at the bottom of the lifting plate, a cam arranged at the end of the long rod away from the atomizer, and a damping strip arranged at the bottom of the inner wall of the detection rod.

[0010] Furthermore, the bottom of the sleeve is provided with a telescopic hole, and the top of the atomizer is provided with a short tube, the outer diameter of which matches the inner diameter of the telescopic hole.

[0011] Furthermore, the top of the lifting plate is symmetrically provided with sliding holes, and the inner wall of the sliding holes is slidably connected to the outer wall of the pressure rod.

[0012] Furthermore, the smoke exhaust unit includes several vertical tubes arranged in a ring array at the bottom of the atomizer, a flexible tube at the bottom end of the vertical tube, a pressure block at the bottom end of the connecting rod, and a fixing frame at the top of the rotating arm near the detection rod. The top end of the flexible tube passes through the bottom and top of the fixing frame in sequence and connects with the vertical tube.

[0013] Furthermore, the hose has several branch pipes arranged in a linear array at its middle and bottom, which penetrate and extend to the side of the rotating arm away from the detection rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a covering mechanism, the fire detector is completely covered by a barrier, forming a relatively closed detection space. This design blocks external airflow interference, prevents smoke from being blown away, and ensures that the smoke can be stably gathered around the detector, thereby ensuring the detection effect. The device has two working modes: interval covering and no covering. It can be flexibly switched according to the on-site detection needs, which not only adapts to different testing environments, but also improves the applicability and ease of operation of the device, and meets the requirements of diverse detection tasks.

[0015] 2. By setting a trigger unit, the covering mechanism is activated by physical contact between the top of the device and the detector. When the device rises to contact the detector and receives sufficient pressure, the trigger unit will act immediately to automatically control the covering mechanism to open. This design simplifies the operation steps, makes the detection process smoother, reduces the complexity of manual intervention, and eliminates the need for operators to perform additional manual operations. The mechanism can be linked by contact, improving detection efficiency and making the entire detection process convenient and fast.

[0016] 3. By setting up a smoke exhaust unit, smoke is discharged from different directions after enveloping the detector. This method simulates the real environment of dense smoke spreading from all sides during a fire, allowing the smoke to evenly contact the detector's sensing components. Multi-angle smoke exhaust compensates for the shortcomings of single-direction spraying, improving the simulation degree and accuracy of detection. In a closed space, the smoke concentration can quickly reach the test standard, ensuring that the detector reacts under conditions close to the real scene, thereby verifying the detector's performance. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the entire invention; Figure 2 This is an exploded view of the covering mechanism of the present invention; Figure 3 This is a schematic diagram of the internal structure of the detection rod of the present invention; Figure 4 This is a schematic diagram of the connection between the connecting rod and the rotating arm of the present invention; Figure 5 This is a schematic diagram of the pressure block and fixing frame structure of the present invention; Figure 6 This is a schematic diagram showing the connection between the sleeve and the atomizer of the present invention; Figure 7 This is a schematic diagram showing the connection between the ejector spring and the lifting plate of the present invention; Figure 8This is a schematic diagram of the cooperation between card block one and card block two of the present invention; Figure 9 This is a schematic diagram of the cam structure of the present invention; Figure 10 This is a schematic diagram of the lifting plate and fixing ring structure of the present invention; Figure 11 This is a schematic diagram of the spiral arm convergence of the present invention; Figure 12 This is a schematic diagram of the spiral arm expansion of the present invention.

[0018] In the picture: 1. Detection rod; 2. Atomizer; 3. Covering mechanism; 31. Fixing ring; 32. Rotary arm; 33. Roller; 34. Latex membrane; 35. Slide groove; 36. Lifting plate; 37. Ejection spring; 38. Connecting rod; 39. Locking block one; 310. Locking block two; 311. Spring; 312. Sleeve; 313. Return spring; 314. Pressure rod; 315. Long rod; 316. Cam; 317. Damping strip; 318. Vertical tube; 319. Flexible hose; 320. Pressure block; 321. Fixing frame. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Example 1, referring to Figures 1-12 The first embodiment of the present invention provides a detection device for a fire detector, including a detection rod 1, an atomizer 2 fixedly connected to the top of the inner wall of the detection rod 1, and a covering mechanism 3 installed on the end of the detection rod near the atomizer 2. The covering mechanism 3 includes a fixing ring 31 fixedly connected to the end of the detection rod 1 near the atomizer 2, a plurality of annular arrays of rotating arms 32 rotatably connected to the outside of the fixing ring 31, rollers 33 rotatably connected to the end of the rotating arms 32 away from the fixing ring 31, and a plurality of annular arrays of rollers fixedly connected between two adjacent rotating arms 32. The film 34 and the latex film 34 are respectively fixedly connected to two adjacent rotating arms 32 on both sides. The sliding grooves 35 are symmetrically opened on the top of the detection rod 1 near the fixed ring 31. The lifting plate 36 is slidably connected inside several sliding grooves 35. The ejection spring 37 is fixedly connected to the bottom of the lifting plate 36. Several ring arrays are rotatably connected to the outside of the lifting plate 36. The end of the connecting rod 38 away from the lifting plate 36 is rotatably connected to the corresponding rotating arm 32. The trigger unit is assembled at the bottom of the lifting plate 36, and the smoke exhaust unit is assembled at the bottom of the atomizer 2.

[0021] Specifically, when detecting a smoke detector, the atomizer 2 is activated to generate smoke. The smoke generated by the atomizer 2 is discharged through the sleeve 312. By holding the bottom of the detection rod 1, the sleeve 312 is brought close to the detector, causing the smoke to be sprayed onto the detector for detection. When there is airflow, the atomizer 2 is activated, and then the sleeve 312 is brought into contact with the wall or detector through the detection rod 1. When the contact force overcomes the preload of the return spring 313, the sleeve 312 will move inward towards the detection rod 1, causing the return spring 313 to store force. The movement of the sleeve 312 simultaneously drives the pressure rod 314 to move synchronously, and the movement of the pressure rod 314 compresses the locking block 310. The second locking block 310 rotates around its connection point with the detection rod 1. This rotation causes the spring 311 to store force, and at this time, the second locking block 310 releases its engagement with the first locking block 39, thus releasing the restriction on the lifting plate 36. The lifting plate 36 then moves upward under the action of the ejector spring 37, moving the long rod 315 along with it. Simultaneously, the lifting plate 36 moves, pulling the rotating arm 32 via the connecting rod 38, causing the rotating arm 32 to rotate upward around its connection point with the fixed ring. The rotating arm 32 moves the roller 33 along with it. After the roller 33 moves an angle with the rotating arm 32, it comes into contact with the wall and is forced to stop. The rotating arm 32 thus also stops moving. The long rod 315 is then rotated relative to the detection rod 1. Simultaneously, the long rod 315 rotates, causing the cam 316 to rotate until its distal end abuts against the damping strip 317. The friction between the cam 316 and the damping strip 317 fixes the long rod 315 and the lifting plate 36. When the rotating arm 32 transitions from a contracted state to an expanded state, it moves the latex membrane 34 along with it. The latex membrane 34, stretched by the two connected rotating arms 32, undergoes elastic deformation, adapting to the positional changes between itself and the two connected rotating arms 32. When the rotating arm 32 is in an expanded state, the latex membrane 34 is stretched, sealing the adjacent... The space between the two rotating arms 32 is enclosed by several latex films 34 to form a relatively closed test space, preventing external airflow from affecting the smoke in the test space. After the test is completed, the compression of the sleeve 312 is released, and the sleeve 312 and the pressure rod 314 are reset under the action of the return spring 313. The cam 316 is rotated so that it no longer contacts the damping strip 317. Then the long rod 315 is pulled down to reset the lifting plate 36. After the lifting plate 36 is reset, it drives the first locking block 39 and the second locking block 310 to re-engage and fix the lifting plate 36 in the initial position. The spring 311 keeps the second locking block 310 in a fixed posture without being squeezed by external force.

[0022] Reference Figure 4 A movable groove is provided at the connection between the rotating arm 32 and the connecting rod 38, and the inner wall of the movable groove is rotatably connected to the end of the connecting rod 38 away from the lifting plate 36.

[0023] Specifically, the movable groove accommodates the bottom end of the connecting rod 38 to rotate internally, and the space inside the movable groove can adapt to changes in the positional relationship between the pressure block 320 and the rotating arm 32.

[0024] Reference Figures 3-7 A retaining ring is provided on the inner wall of the detection rod 1 near the fixed ring 31. The top and bottom of the reset spring 313 are fixedly connected to the retaining ring and the lifting plate 36, respectively.

[0025] Specifically, the retaining ring provides the force point for the ejector spring 37, and through its rotatable connection with the second locking block 310, the second locking block 310 can only rotate in its original position.

[0026] Example 2, refer to Figures 1-12 This is the second embodiment of the present invention. This embodiment differs from the first embodiment in that: the triggering unit includes a first locking block 39 symmetrically fixedly connected to the bottom of the lifting plate 36, a second locking block 310 symmetrically rotatably connected to the top of the retaining ring, a spring 311 fixedly connected to the bottom of the second locking block 310, the top and bottom ends of the spring 311 being fixedly connected to the second locking block 310 and the retaining ring respectively, a sleeve 312 slidably connected to the top of the detection rod 1, a return spring 313 sleeved at the bottom of the sleeve 312, the two ends of the return spring 313 being fixedly connected to the sleeve 312 and the atomizer 2 respectively, pressure rods 314 symmetrically fixedly connected to both sides of the sleeve 312, the bottom end of the pressure rod 314 penetrating the lifting plate 36 and abutting against the second locking block 310, a long rod 315 rotatably connected to the bottom of the lifting plate 36, a cam 316 fixedly connected to the end of the long rod 315 away from the atomizer 2, and a damping strip 317 fixedly connected to the bottom of the inner wall of the detection rod 1.

[0027] Specifically, the triggering unit enables the covering mechanism 3 to be triggered and started through the sleeve 312, avoiding manual operation and reducing the difficulty of operation.

[0028] Reference Figure 6 The bottom of the sleeve 312 is provided with a telescopic hole, and the top of the atomizer 2 is provided with a short tube, the outer diameter of which matches the inner diameter of the telescopic hole.

[0029] Specifically, the sleeve 312 is connected to the short tube through the telescopic hole, so that the sleeve 312 and the atomizer 2 can still maintain communication when they are in relative motion, allowing the smoke generated by the atomizer 2 to be smoothly discharged through the sleeve 312.

[0030] Reference Figures 3-7 The top of the lifting plate 36 is symmetrically provided with sliding holes, and the inner wall of the sliding holes is slidably connected to the outer wall of the pressure rod 314.

[0031] Specifically, the lifting plate 36 constrains the movement trajectory of the pressure rod 314 through the sliding hole, so that the lifting rod can only move vertically.

[0032] Reference Figures 1-12 The smoke extraction unit includes several annular arrays of vertical tubes 318 fixedly connected to the bottom of the atomizer 2, a flexible tube 319 fixedly connected to the bottom end of the vertical tube 318, a pressure block 320 fixedly connected to the bottom end of the connecting rod 38, and a fixing frame 321 fixedly connected to the top of the rotating arm 32 near the detection rod 1. The top end of the flexible tube 319 passes through the bottom and top of the fixing frame 321 and connects with the vertical tube 318.

[0033] Specifically, when the rotating arm 32 is in the contracted state, the gap between the pressure block 320 and the fixing frame 321 is small. Therefore, the pressure block 320 squeezes the portion of the hose 319 within the range of the fixing frame 321, sealing the hose 319. At this time, the smoke in the vertical pipe 318 cannot be discharged through the hose 319. As the rotating arm 32 expands with the connecting rod 38, the relative position between the rotating arm 32 and the pressure block 320 changes. The pressure block 320 gradually moves away from the fixing frame 321, thereby releasing the compression on the hose 319 and allowing the hose 319 to flow freely. In the state where the rotating arm 32 rotates, it drives the hose 319 to move together. After the rotating arm 32 has expanded and been fixed, the outlet end of the branch pipe of the hose 319 will be inside the test space. At this time, the atomizer 2 delivers smoke into the vertical pipe 318. The smoke enters the hose 319 through the vertical pipe 318 and enters the test space through the hose 319. Since several hoses 319 move synchronously, they will also exhaust smoke at the same time, so that the smoke blows towards the smoke detector from different directions and quickly fills the test space, more realistically simulating the closed dense smoke environment during a fire.

[0034] Reference Figures 2-5 The middle and bottom of the flexible tube 319 are provided with several branch tubes in a linear array, which pass through and extend to the side of the rotating arm 32 away from the detection rod 1.

[0035] Specifically, the smoke generated by the atomizer 2 enters the hose 319 through the vertical pipe 318, and then enters the test space through the branch pipe of the hose 319. The rest of the structure is the same as that of Example 1.

[0036] Based on embodiments 1-2, the working principle of this invention is as follows: During detection, the sleeve 312 is brought close to the detector by holding the detection rod 1, and the atomizer 2 is activated to generate smoke. When the sleeve 312 contacts the detector or wall and the force overcomes the preload of the return spring 313, the sleeve 312 compresses and moves inward into the detection rod 1, driving the pressure rod 314 fixed on it to move synchronously. The pressure rod 314 squeezes and rotates the second locking block 310 connected to the retaining ring, causing it to rotate around the fulcrum. The spring 311 deforms and stores energy accordingly. After the second locking block 310 rotates, its engagement with the first locking block 39 fixed at the bottom of the lifting plate 36 is released. The lifting plate 36 then moves upward under the action of the push-out spring 37. When the lifting plate 36 moves upward, the connecting rod 38 pulls the rotating arm 32, causing the rotating arm 32 to rotate outward and upward around the connection point on the fixed ring 31. The latex film 34 is stretched accordingly, sealing the adjacent rotating arm 32. The gap between the two forms a barrier that envelops the detector, effectively blocking the external airflow. The rotating arm 32 expands until the roller 33 at its end abuts against the wall and stops. At this time, the operator rotates the long rod 315, which drives the cam 316 at its lower end to rotate until it rubs tightly against the damping strip 317 on the inner wall of the detection rod 1, thereby locking the lifting plate 36 and the entire covering mechanism 3 in the unfolded state. During the expansion of the rotating arm 32, due to the change in the angle of the connecting rod 38, the pressure block 320 fixed at its end moves away from the fixing frame 321 fixed on the rotating arm 32, thereby releasing the compression on the hose 319 passing through the fixing frame 321, opening the smoke exhaust passage. The smoke then enters each hose 319 from the atomizer 2 through the corresponding vertical pipe 318 and is discharged from the branch pipes in different directions on the hose 319, quickly filling the formed closed test space and simulating the real dense smoke environment to test the detector. After the test is completed, first rotate the long rod 315 to disengage the cam 316 from the damping strip 317, then pull down the long rod 315 to move the lifting plate 36 down to reset. During the downward movement, the connecting rod 38 pushes the rotating arm 32 to retract, the latex membrane 34 relaxes, and at the same time, the sleeve 312 moves outward to reset under the action of the reset spring 313. The pressure rod 314 then retracts and no longer presses the second locking block 310. The second locking block 310 then rotates in the opposite direction to reset under the torque of the spring 311, and re-engages with the first locking block 39 on the lifting plate 36, locking the mechanism in the contracted state. At the same time as the rotating arm 32 retracts, the pressure block 320 approaches and presses the hose 319 in the fixing frame 321 again, sealing it, and the device returns to the initial state.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A detection device for a fire detector, comprising a detection rod (1) and an atomizer (2) disposed on the top of the inner wall of the detection rod (1), characterized in that: It also includes a cover mechanism (3) located at the end of the probe near the atomizer (2); The covering mechanism (3) includes a fixing ring (31) disposed at one end of the detection rod (1) near the atomizer (2), several annular arrays of rotating arms (32) disposed outside the fixing ring (31), a roller (33) disposed at one end of the rotating arm (32) away from the fixing ring (31), and several annular arrays of latex film (34) disposed between two adjacent rotating arms (32). The two sides of the latex film (34) are fixedly connected to the two adjacent rotating arms (32) respectively, and are symmetrically opened on the detection rod (1). The slide groove (35) near the top of the fixed ring (31), the lifting plate (36) which is set inside several slide grooves (35), the ejection spring (37) set at the bottom of the lifting plate (36), the connecting rod (38) arranged in several ring arrays on the outside of the lifting plate (36), the end of the connecting rod (38) away from the lifting plate (36) is rotatably connected to the corresponding rotating arm (32), the trigger unit set at the bottom of the lifting plate (36), and the smoke exhaust unit set at the bottom of the atomizer (2).

2. The detection device for fire detectors according to claim 1, characterized in that: A movable groove is provided at the connection between the rotating arm (32) and the connecting rod (38), and the inner wall of the movable groove is rotatably connected to the end of the connecting rod (38) away from the lifting plate (36).

3. The detection device for fire detectors according to claim 1, characterized in that: A retaining ring is provided on the inner wall of the detection rod (1) near the fixing ring (31), and the top and bottom of the reset spring (313) are fixedly connected to the retaining ring and the lifting plate (36) respectively.

4. The detection device for fire detectors according to claim 1, characterized in that: The triggering unit includes a first locking block (39) symmetrically arranged at the bottom of the lifting plate (36), a second locking block (310) symmetrically arranged at the top of the retaining ring, a spring (311) arranged at the bottom of the second locking block (310), the top and bottom ends of the spring (311) being fixedly connected to the second locking block (310) and the retaining ring respectively, a sleeve (312) arranged at the top of the detection rod (1), and a return spring (313) sleeved at the bottom of the sleeve (312). The two ends of the tube (312) are fixedly connected to the sleeve (312) and the atomizer (2) respectively. The pressure rod (314) is symmetrically arranged on both sides of the sleeve (312). The bottom end of the pressure rod (314) passes through the lifting plate (36) and abuts against the second block (310). The long rod (315) is set at the bottom of the lifting plate (36), the cam (316) is set at the end of the long rod (315) away from the atomizer (2), and the damping strip (317) is set at the bottom of the inner wall of the detection rod (1).

5. The detection device for fire detectors according to claim 4, characterized in that: The bottom of the sleeve (312) is provided with a telescopic hole, and the top of the atomizer (2) is provided with a short tube, the outer diameter of which matches the inner diameter of the telescopic hole.

6. The detection device for fire detectors according to claim 1, characterized in that: The top of the lifting plate (36) is symmetrically provided with sliding holes, and the inner wall of the sliding holes is slidably connected to the outer wall of the pressure rod (314).

7. The detection device for fire detectors according to claim 1, characterized in that: The exhaust unit includes several vertical tubes (318) arranged in a ring array at the bottom of the atomizer (2), a flexible tube (319) arranged at the bottom end of the vertical tube (318), a pressure block (320) arranged at the bottom end of the connecting rod (38), and a fixing frame (321) arranged at the top of the rotating arm (32) near the detection rod (1). The top end of the flexible tube (319) passes through the bottom and top of the fixing frame (321) and connects with the vertical tube (318).

8. The detection device for fire detectors according to claim 7, characterized in that: The hose (319) has several branch pipes arranged in a linear array at the middle and bottom, which penetrate and extend to the side of the rotating arm (32) away from the detection rod (1).

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