Fire ventilation and smoke extraction device

Abstract

The utility model relates to fire ventilation and smoke exhaust equipment technical field especially, a kind of fire ventilation and smoke exhaust equipment is provided.The utility model provides a kind of fire ventilation and smoke exhaust equipment with in the high-altitude installation process of fire ventilation and smoke exhaust equipment, the problem that traditional bolt fixed mode exists operation cumbersome, high security risk, adjusting mechanism can be positioned quickly by the sliding of installation cylinder in the slot, semicircular mounting rod is inserted into positioning groove and installation cylinder is locked, the quick installation of smoke exhaust equipment body is realized.The problem of high-altitude installation operation cumbersome, poor security is solved, reaches the advantages that installation cylinder is positioned quickly inserted into slot, mounting rod one-key locking, toolless operation, reduce high-altitude operation risk, improve installation efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of fire ventilation and smoke exhaust equipment, and in particular to a fire ventilation and smoke exhaust equipment. Background Technology

[0002] Fire ventilation and smoke extraction equipment is an important component of building fire protection systems. It is mainly used to quickly remove smoke and toxic gases when a fire occurs, while delivering fresh air to evacuation routes to ensure the safe escape of personnel and the smooth progress of fire rescue operations.

[0003] Existing technologies, such as the utility model with publication number CN220103323U, disclose a fire-fighting smoke exhaust ventilation device. The key technical points of this device are: it includes a pipe body, a fan, a filter screen, a dust collection brush, a drive mechanism, and an air-dust separator. The fan is installed inside the pipe body and forms a negative pressure chamber at one end. The filter screen is installed on the side of the fan away from the negative pressure chamber. The dust collection brush is rotatably mounted on one side of the filter screen. The drive mechanism is installed on the pipe body and used to drive the dust collection brush to rotate. The dust collection brush has a cavity, and the side of the dust collection brush near the filter screen has bristles and a dust collection hole communicating with the cavity. The cavity of the dust collection brush communicates with the inside of the negative pressure chamber. An air-dust separator is installed between the dust collection brush and the negative pressure chamber. Dust-laden gas flows into the air-dust separator under negative pressure, causing the dust to be separated, thus preventing the dust separated from the filter screen from being discharged into the atmosphere and reducing environmental pollution. Furthermore, dust not separated by the air-dust separator will re-enter the negative pressure chamber with the airflow for further filtration, further improving the filter screen's filtration effect on smoke-laden gas.

[0004] Regarding the aforementioned content, the following technical defects exist: Fire ventilation and smoke extraction equipment is a fire protection facility used to quickly remove smoke and provide fresh air during a fire. It typically consists of a boom, a mounting base installed between two booms, and smoke extraction equipment installed on the mounting base. The boom is fixed to the building's top structure, the mounting base supports the smoke extraction equipment, and the smoke extraction equipment is responsible for extracting and removing smoke. During the installation of fire ventilation and smoke extraction equipment, the equipment needs to be installed on the mounting base high up in the building, which is considered high-altitude work with limited operating space. Traditional installation methods use multiple bolts to fix the smoke extraction equipment to the mounting base. During installation, operators need to use tools at a height to tighten each bolt one by one. This is not only cumbersome and time-consuming, but also difficult and risky at heights, resulting in low installation efficiency. Utility Model Content

[0005] The purpose of this utility model is to solve the problems of existing technology where smoke exhaust equipment needs to be installed on a mounting base at a high place in the building, which is a high-altitude operation with limited operating space. Traditional installation methods use multiple bolts to fix the smoke exhaust equipment to the mounting base. During installation, operators need to use tools at a high place to tighten each bolt one by one. This is not only cumbersome and time-consuming, but also difficult and risky at high altitudes, resulting in low installation efficiency.

[0006] To solve the above technical problems, this utility model provides a fire ventilation and smoke exhaust device, including: two hangers, with a common mounting base installed on the side of the two hangers close to each other; a smoke exhaust device body is installed on the side of the mounting base near the hangers; an adjustment mechanism is provided on the mounting base corresponding to the position of the smoke exhaust device body; the adjustment mechanism includes a slot; a slot is provided on the mounting base corresponding to the position of the smoke exhaust device body; two mounting cylinders are slidably connected to the inner wall of the slot; both mounting cylinders are fixedly connected to one side of the smoke exhaust device body; a positioning groove is provided on the arc surface of the mounting cylinder; an installation rod slides through the inner wall of the positioning groove; the installation rod has a semi-circular cross-section; a connecting block is fixedly connected to one end of the arc surface of the installation rod; a fixing block is fixedly connected to one side of the connecting block; and a support rod is rotatably connected to one side of the fixing block. The support rod is an L-shaped rod. One end of the arc surface of the support rod is fixedly connected to the top wall of the mounting base. The side of the fixing block away from the support rod is fixedly connected to one end of the arc surface of the connecting rod. The arc surface of the connecting rod rotatably penetrates the side wall of the mounting base. A rotating disk is fixedly connected to the other end of the arc surface of the connecting rod. Two limiting holes are opened on the side of the rotating disk, and the two limiting holes are evenly distributed on the rotating disk. A rotating block is fixedly connected to the arc surface of the rotating disk away from the connecting rod. The rotating block facilitates the operator to rotate the connecting rod. A sliding rod slides through the inner wall of one of the limiting holes. One end of the sliding rod slides through the mounting base. A first spring is sleeved on the end of the sliding rod near the fixing block. The two ends of the first spring are fixedly connected to the sliding rod and the mounting base, respectively. A pressing block is fixedly connected to the end of the sliding rod near the fixing block.

[0007] The aforementioned components achieve the following effects: The fire ventilation and smoke extraction equipment body is a fire protection facility used to quickly exhaust smoke and provide fresh air during a fire. It typically consists of a boom, a mounting base installed between two booms, and the smoke extraction equipment body installed on the mounting base. The boom is fixed to the building's roof structure, the mounting base supports the smoke extraction equipment, and the smoke extraction equipment body is responsible for extracting and exhausting smoke. During the installation of the fire ventilation and smoke extraction equipment, the smoke extraction equipment body needs to be installed on the mounting base at a high point in the building, which is considered high-altitude work with limited operating space. Traditional installation methods use multiple bolts to fix the smoke extraction equipment body to the mounting base. During installation, operators need to use tools at a high altitude to tighten each bolt one by one. This is not only cumbersome and time-consuming, but also difficult and risky at high altitudes, resulting in low installation efficiency. This problem can be solved by an adjustment mechanism. The adjustment mechanism enables rapid installation of the smoke extraction equipment body and reduces the risks of high-altitude work, thus solving the problems of cumbersome operation and poor safety at high altitudes. The adjustment mechanism enables rapid installation and disassembly of the smoke extraction equipment body.

[0008] Preferably, a protective cylinder is fixedly connected to the side wall of the mounting base at the position corresponding to the sliding rod. The arc surface of the protective cylinder is provided with a connecting groove at the position corresponding to the pressing block. The pressing block is slidably connected to the inner wall of the connecting groove. The sliding rod, in conjunction with the limiting hole, can position the angle of the rotating disk.

[0009] The effect achieved by the above components is that the protective sleeve can protect the first spring on the sliding rod and prevent foreign objects from entering the interior of the first spring.

[0010] Preferably, a guide block is fixedly connected to the end of the mounting rod away from the connecting block on the arc surface, and the guide block is hemispherical.

[0011] The effect achieved by the above-mentioned components is that the arc-shaped guide block can guide the installation rod when it is inserted into the positioning groove, so that the installation rod can smoothly enter the positioning groove and reduce the difficulty of operation.

[0012] Preferably, the mounting base is provided with an auxiliary mechanism on the side near the rotating block. The auxiliary mechanism includes two positioning blocks, which are slidably connected to the inner wall of the rotating block. A positioning strip is fixedly connected to the side of the positioning block away from the rotating block, and the same sliding ring is fixedly connected to the side of the two positioning strips that are close to each other.

[0013] The effect achieved by the above components is as follows: After the main body of the fire ventilation and smoke exhaust equipment is installed, the main body of the smoke exhaust equipment needs to be in a high-altitude working state for a long time. An auxiliary mechanism can be used to improve the stability of the rotating block when it is not in use. The auxiliary mechanism can form a secondary lock on the rotating block, thereby improving the stability of the rotating block when it is not in use.

[0014] Preferably, a limiting rod slides through the inner wall of the sliding ring, one end of the arc surface of the limiting rod is fixedly connected to one side of the mounting base, a second spring is sleeved on the side of the arc surface of the limiting rod away from the mounting base, the two ends of the arc surface of the second spring are fixedly connected to the limiting rod and one side of the sliding ring respectively, a connecting piece is fixedly connected to one end of the arc surface of the sliding ring, a fixing rod is threaded through the inner wall of the connecting piece, and one end of the arc surface of the fixing rod is threadedly connected to the side wall of the mounting base.

[0015] The effect achieved by the above components is as follows: pressing the second spring causes the sliding ring to move, which in turn causes the positioning bar to move the positioning block to maintain contact with the rotating block. Then, the sliding ring is locked to the limit bar by the fixing rod, thus forming a lock and improving the stability of the rotating disk after locking.

[0016] Preferably, an adjusting block is fixedly connected to the arc surface of the limiting rod, and the adjusting block is a rubber block.

[0017] The effects achieved by the above components are: the adjusting block can prevent the positioning strip from making hard contact with the top of the limiting rod when it is reset, and the adjusting block can protect the rod body of the limiting rod.

[0018] Compared with related technologies, the fire ventilation and smoke exhaust equipment provided by this utility model has the following beneficial effects: This utility model provides a fire ventilation and smoke exhaust device. By setting up an adjustment mechanism, the traditional bolt fixing method has problems such as cumbersome operation and high safety risks during the high-altitude installation of the fire ventilation and smoke exhaust device. The adjustment mechanism can achieve quick positioning by sliding the installation cylinder in the slot. The semi-circular installation rod is inserted into the positioning slot to lock the installation cylinder, realizing the rapid installation of the smoke exhaust device body. This solves the problems of cumbersome operation and poor safety of high-altitude installation. It achieves the beneficial effects of quick insertion of the installation cylinder into the slot for positioning, one-click locking of the installation rod, operation without tools, reduced risk of high-altitude operation, and improved installation efficiency.

[0019] By setting up an auxiliary mechanism, after the main body of the fire ventilation and smoke exhaust equipment is installed, the auxiliary mechanism can slide along the limit rod through the sliding ring. The positioning strip drives the positioning block to contact the inner wall of the rotating block, thereby locking the rotating block. The fixing rod is connected to the mounting base to lock the sliding ring on the limit rod, thus locking the rotating block. This achieves the beneficial effect of secondary auxiliary locking of the rotating block and improving the rotational stability when not in use. Attached Figure Description

[0020] Figure 1 A structural schematic diagram of a fire ventilation and smoke exhaust device provided by this utility model; Figure 2 This is a schematic diagram of the adjustment mechanism; Figure 3 for Figure 2The enlarged view of point A shown; Figure 4 for Figure 2 The enlarged view at point B is shown below; Figure 5 This is a partially enlarged schematic diagram of the adjustment mechanism; Figure 6 This is a schematic diagram of the auxiliary mechanism.

[0021] The diagram shows the following components: 1. Hanging rod; 2. Adjusting mechanism; 201. Slot; 202. Mounting cylinder; 203. Positioning slot; 204. Mounting rod; 205. Connecting block; 206. Fixing block; 207. Support rod; 208. Connecting rod; 209. Rotating disc; 210. Rotating block; 211. Limiting hole; 212. Sliding rod; 213. First spring; 214. Pressing block; 215. Protective cylinder; 216. Connecting slot; 217. Guide block; 3. Auxiliary mechanism; 31. Limiting rod; 32. Second spring; 33. Sliding ring; 34. Positioning strip; 35. Positioning block; 36. Connecting piece; 37. Fixing rod; 38. Adjusting block; 4. Mounting base; 5. Smoke exhaust equipment body. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0024] Please see Figures 1 to 6 The present invention provides a fire ventilation and smoke exhaust device, comprising: two hangers 1, the same mounting base 4 installed on the side of the two hangers 1 close to each other, a smoke exhaust device body 5 installed on the side of the mounting base 4 close to the hangers 1, an adjustment mechanism 2 provided on the mounting base 4 corresponding to the position of the smoke exhaust device body 5, and an auxiliary mechanism 3 provided on the side of the mounting base 4 close to the rotating block 210.

[0025] In the embodiments of this utility model, please refer to Figures 2 to 5The adjustment mechanism includes a slot. A slot is provided on the mounting base corresponding to the position of the smoke exhaust device body. Two mounting cylinders are slidably connected to the inner wall of the slot. Both mounting cylinders are fixedly connected to one side of the smoke exhaust device body. A positioning groove is provided on the arc surface of the mounting cylinder. An installation rod slides through the inner wall of the positioning groove. The installation rod has a semi-circular cross-section. A connecting block is fixedly connected to one end of the arc surface of the installation rod. A fixing block is fixedly connected to one side of the connecting block. A support rod is rotatably connected to one side of the fixing block. The support rod is L-shaped. One end of the support rod's arc surface is fixedly connected to the top wall of the mounting base. The side of the fixing block away from the support rod is fixedly connected to one end of the connecting rod's arc surface. The arc surface of the connecting rod rotatably passes through the side wall of the mounting base. A rotating disk is fixedly connected to the other end of the arc surface of the rod. Two limiting holes are evenly distributed on the side of the rotating disk. A rotating block is fixedly connected to the end of the rotating disk away from the connecting rod's arc surface, allowing the operator to rotate the connecting rod. A sliding rod slides through the inner wall of one of the limiting holes, with one end of the sliding rod sliding through a mounting base. A first spring is fitted onto the end of the sliding rod near the fixed block, with both ends of the first spring fixedly connected to the sliding rod and the mounting base, respectively. A pressing block is fixedly connected to the end of the sliding rod near the fixed block. The fire ventilation and smoke exhaust equipment is a fire-fighting facility used to quickly exhaust smoke and provide fresh air during a fire. It typically consists of a suspension rod and is installed between two suspension rods. The system consists of a mounting base and the smoke extraction equipment body mounted on the mounting base. The suspension rod is fixed to the building's roof structure. The mounting base supports the smoke extraction equipment, and the equipment body is responsible for extracting and exhausting smoke. During the installation of fire-fighting smoke extraction equipment, the equipment body needs to be installed on the mounting base high up in the building, which involves working at height with limited operating space. Traditional installation methods use multiple bolts to fix the equipment body to the mounting base. During installation, operators need to use tools at height to tighten each bolt individually, which is not only cumbersome and time-consuming, but also presents significant challenges and safety risks due to the high altitude, resulting in low installation efficiency. This problem can be solved by an adjustment mechanism. The adjustment mechanism enables rapid installation of the smoke extraction equipment body and reduces the risk of high-altitude work. To address the issues of cumbersome and unsafe high-altitude installation operations, the adjustment mechanism enables rapid installation and disassembly of the smoke exhaust equipment. A protective cylinder is fixedly connected to the side wall of the mounting base corresponding to the sliding rod position. A connecting groove is opened on the arc surface of the protective cylinder corresponding to the pressing block position. The pressing block is slidably connected to the inner wall of the connecting groove. The sliding rod, in conjunction with the limiting hole, can position the angle of the rotating disk. The protective cylinder can protect the first spring on the sliding rod, preventing foreign objects from entering the first spring. A guide block is fixedly connected to the arc surface of the mounting rod away from the connecting block. The guide block is hemispherical and can guide the mounting rod when it is inserted into the positioning groove, allowing the mounting rod to smoothly enter the positioning groove and reducing the difficulty of operation. In the embodiments of this utility model, please refer to Figure 6The auxiliary mechanism includes two positioning blocks, each slidably connected to the inner wall of the rotating block. Positioning strips are fixedly connected to the side of each positioning block furthest from the rotating block, and a common sliding ring is fixedly connected to the side of each positioning strip closest to it. After the fire ventilation and smoke exhaust equipment body is installed, the equipment body needs to operate at high altitudes for extended periods. The auxiliary mechanism can be used to improve the stability of the rotating block when not in use. The auxiliary mechanism provides a secondary lock to the rotating block, thus enhancing its stability when not in use. A limit rod slides through the inner wall of the sliding ring. One end of the arc surface of the limit rod is fixedly connected to one side of the mounting base, and a second spring is fitted onto the side of the arc surface of the limit rod furthest from the mounting base. The two ends of the arc surface of the second spring are fixedly connected to the limiting rod and one side of the sliding ring, respectively. A connecting piece is fixedly connected to one end of the arc surface of the sliding ring. A fixing rod is threaded through the inner wall of the connecting piece. One end of the arc surface of the fixing rod is threaded to the side wall of the mounting base. When the second spring is pressed, it can push the sliding ring to move, so that the positioning strip drives the positioning block to keep in contact with the rotating block. Then, the fixing rod locks the sliding ring onto the limiting rod, forming a lock, thereby improving the stability of the rotating disk after locking. An adjusting block is fixedly connected to the arc surface of the limiting rod. The adjusting block is a rubber block. The adjusting block can prevent the positioning strip from making hard contact with the top of the limiting rod when it resets. The adjusting block can protect the rod body of the limiting rod.

[0026] The working principle of the fire ventilation and smoke exhaust equipment provided by this utility model is as follows: First, the operator can align the mounting cylinders 202 on both sides of the smoke exhaust equipment body 5 with the slots 201 on the mounting base 4, so that the mounting cylinders 202 contact the inner wall of the slots 201. Then, the operator can pull the pressing block 214. The movement of the pressing block 214 will pull the sliding rod 212 out of the limiting hole 211. At this time, the positioning effect of the sliding rod 212 on the rotating block 210 through the limiting hole 211 can be released. At this time, the rotating block 210 can be rotated. The rotation of the rotating block 210 can drive the connecting rod 208 and the fixing block 206 to rotate synchronously. The fixing block 206 can then drive the connecting block 205 and the semi-circular mounting rod 204 to rotate synchronously, so that the arc-shaped guide block 217 at the end of the mounting rod 204 is inserted into the mounting cylinder 202. The mounting cylinder 202 can be locked in the slot 201 within the positioning groove 203. At the same time, the rotating block 206 drives the support rod 207 to rotate and provide support. When the mounting rod 204 is rotated into place, the pressing block 214 can be released. Under the elastic force of the first spring 213, the sliding rod 212 will be inserted into the limiting hole 211 on the rotating disk 209, thereby locking the rotating disk 209 again and preventing the rotating block 210 from rotating accidentally. This allows for the quick installation and fixing of the smoke exhaust equipment body 5. When disassembly is required, press the pressing block 214 to make the sliding rod 212 exit from the limiting hole 211. Rotate the rotating block 210 in the opposite direction to make the mounting rod 204 exit from the positioning groove 203, and then remove the smoke exhaust equipment body 5 along with the mounting cylinder 202 from the slot 201.

[0027] Once the smoke exhaust device body 5 is installed and the rotating block 210 is rotated to the locked position, the auxiliary mechanism 3 can activate the auxiliary locking. The operator can push the connecting piece 36, and the movement of the connecting piece 36 will cause the sliding ring 33 to slide along the direction of the limiting rod 31 towards the rotating block 210. The second spring 32 will be stretched and store elastic potential energy. The movement of the sliding ring 33 will drive the two positioning bars 34 to move synchronously towards the position of the rotating block 210, so that the movement of the positioning bars 34 will drive the positioning blocks 35 on their surfaces to move in tandem with the rotating block 210. The inner wall of the moving block 210 comes into contact, thereby assisting in locking the rotating block 210. Then, the operator tightens the fixing rod 37 inside the connecting piece 36, so that the fixing rod 37 passes through the connecting piece 36 and is threadedly connected to the side wall of the mounting base 4, thereby locking the sliding ring 33 onto the limit rod 31 and completing the locking of the rotating block 210. When it is necessary to disassemble the smoke exhaust equipment body 5, first loosen the fixing rod 37 to release the locking of the connecting piece 36. The second spring 32 releases its elastic force to push the sliding ring 33 to reset, thus releasing the locking effect.

[0028] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0029] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A fire-fighting ventilation and smoke extraction device, characterized in that, include: Two suspension rods (1) are provided, and a common mounting base (4) is installed on the side of the two suspension rods (1) that is close to each other. A smoke exhaust device body (5) is installed on the side of the mounting base (4) that is close to the suspension rod (1). An adjustment mechanism (2) is provided on the mounting base (4) corresponding to the position of the smoke exhaust device body (5). The adjustment mechanism (2) includes a slot (201). The mounting base (4) is provided with a slot (201) corresponding to the position of the smoke exhaust device body (5). Two mounting cylinders (202) are slidably connected to the inner wall of the slot (201). Both mounting cylinders (202) are connected to the smoke exhaust device body. The mounting cylinder (202) is fixedly connected to one side of the body (5). A positioning groove (203) is provided on the arc surface of the mounting cylinder (202). The inner wall of the positioning groove (203) is slidably penetrated by the mounting rod (204). The cross-section of the mounting rod (204) is semi-circular. A connecting block (205) is fixedly connected to one end of the arc surface of the mounting rod (204). A fixing block (206) is fixedly connected to one side of the connecting block (205). A support rod (207) is rotatably connected to one side of the fixing block (206). The support rod (207) is an L-shaped rod. One end of the arc surface of the support rod (207) is connected to the mounting cylinder (5). The mounting base (4) is fixedly connected to the top wall. The side of the fixing block (206) away from the support rod (207) is fixedly connected to one end of the arc surface of the connecting rod (208). The arc surface of the connecting rod (208) rotates through the side wall of the mounting base (4). The other end of the arc surface of the connecting rod (208) is fixedly connected to a rotating disk (209). Two limiting holes (211) are opened on the side of the rotating disk (209). The two limiting holes (211) are evenly distributed on the rotating disk (209). The end of the rotating disk (209) away from the arc surface of the connecting rod (208) is fixedly connected to a... A rotating block (210) is provided to facilitate the rotation of the connecting rod (208) by the operator. A sliding rod (212) is slidably passed through the inner wall of one of the limiting holes (211). One end of the sliding rod (212) is slidably passed through the mounting base (4). A first spring (213) is sleeved on one end of the sliding rod (212) near the fixed block (206). The two ends of the first spring (213) are fixedly connected to the sliding rod (212) and the mounting base (4) respectively. A pressing block (214) is fixedly connected to one end of the sliding rod (212) near the fixed block (206).

2. The fire ventilation and smoke exhaust equipment according to claim 1, characterized in that, The mounting base (4) has a protective cylinder (215) fixedly connected to the side wall corresponding to the sliding rod (212). The arc surface of the protective cylinder (215) has a connecting groove (216) corresponding to the pressing block (214). The pressing block (214) is slidably connected to the inner wall of the connecting groove (216). The sliding rod (212) can position the angle of the rotating disk (209) in conjunction with the limiting hole (211).

3. The fire ventilation and smoke exhaust equipment according to claim 1, characterized in that, The arc surface of the mounting rod (204) away from the connecting block (205) is fixedly connected to a guide block (217), which is hemispherical.

4. A fire-fighting ventilation and smoke extraction device according to claim 1, characterized in that, The mounting base (4) is provided with an auxiliary mechanism (3) on the side near the rotating block (210). The auxiliary mechanism (3) includes two positioning blocks (35). The two positioning blocks (35) are slidably connected to the inner wall of the rotating block (210). A positioning strip (34) is fixedly connected to the side of the positioning block (35) away from the rotating block (210). The same sliding ring (33) is fixedly connected to the side of the two positioning strips (34) that are close to each other.

5. A fire-fighting ventilation and smoke extraction device according to claim 4, characterized in that, The inner wall of the sliding ring (33) slides through the limiting rod (31). One end of the arc surface of the limiting rod (31) is fixedly connected to one side of the mounting base (4). A second spring (32) is sleeved on the side of the arc surface of the limiting rod (31) away from the mounting base (4). The two ends of the arc surface of the second spring (32) are fixedly connected to the limiting rod (31) and one side of the sliding ring (33), respectively. A connecting piece (36) is fixedly connected to one end of the arc surface of the sliding ring (33). A fixing rod (37) is threaded through the inner wall of the connecting piece (36). One end of the arc surface of the fixing rod (37) is threadedly connected to the side wall of the mounting base (4).

6. A fire-fighting ventilation and smoke extraction device according to claim 5, characterized in that, The arc surface of the limiting rod (31) is fixedly connected to an adjusting block (38), which is a rubber block.

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