Environment-friendly and heat-insulating silicon magnesium rock fireproof composite air pipe

Abstract

The invention discloses an environment-friendly and heat-insulating silicon magnesium rock fireproof composite air pipe. The fireproof composite air duct comprises an air duct, sliding openings are transversely formed in the front end and the rear end of the two sides of the bottom face of the air duct, lifting assemblies are arranged below the two sides of the air duct, flame-retardant assemblies are arranged on the two sides in the air duct, and a connecting assembly is arranged in the middle of the air duct. Through cooperation of the sliding block and the sliding opening, the air pipe can be conveniently and rapidly installed and hoisted, and the convenience of air pipe installation is improved; through the cooperation of the wedge strip and the fixing frame, the silicomagnesium rock can be conveniently installed after the air pipe is hoisted, so that the weight of the air pipe during hoisting is reduced, and the efficiency of installing the air pipe is improved; through cooperation of a rack, a gear set and a driving gear, movement of a sealing strip plate is conveniently controlled, and therefore flowing of air in the air pipe is controlled; through cooperation of the sealing plate and the sealing strip plate, air in the air pipe can be isolated conveniently, and then fire spreading is effectively restrained; and through cooperation of the spring and the pricking needle, the flame-retardant bag can be punctured conveniently, and then the fire extinguishing effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of fireproof composite air ducts, and in particular to an environmentally friendly and heat-insulating magnesia silicate fireproof composite air duct. Background Art

[0002] As an important part of the ventilation system, air ducts play a key role in industrial and home environments. The special performance requirements for air ducts in different situations are also different. For example, in industrial environments, high temperature resistance and corrosion resistance may need to be considered, while in home environments, more attention is paid to aspects such as quietness and energy saving. However, whether in industrial or home environments, the fireproof and heat-insulating performance of air ducts has always been the focus of fire prevention and disaster relief work. The existing internal fire protection devices of air ducts generally install fire dampers and temperature monitors. The temperature in the air duct is monitored by the temperature monitor. When the temperature reaches the threshold, the fire damper is controlled to close, thereby isolating the air flow and achieving the effect of fire extinguishing. However, the opening and closing of the fire damper is absolute and the air flow rate cannot be adjusted. Although this ensures the effectiveness of closing the fire damper in case of fire, the single function of the fire damper is limited when it is necessary to remove thick smoke rather than prevent the spread of fire. Therefore, improvements need to be made based on the above problems. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an environmentally friendly and heat-insulating magnesia-silica fireproof composite air duct.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an environmentally friendly heat-insulating magnesia-silica fireproof composite air duct, comprising an air duct, wherein sliding openings are horizontally opened at the front and rear ends of both sides of the bottom surface of the air duct, and lifting components are arranged below both sides of the air duct, and the lifting components include a supporting plate, a slider and a vertical pole; the supporting plate is longitudinally arranged at the lower end of the air duct, the slider is placed in the sliding opening, and the slider is installed on the top surface of the supporting plate, and straight slots are opened at both ends of the supporting plate, the lower end of the vertical pole is installed in the straight slot, and the upper end of the vertical pole is installed on the ceiling through a circular flange; flame-retardant components are arranged on both sides of the inside of the air duct, and a connecting component is arranged in the middle of the air duct;

[0005] The flame retardant assembly includes a fixing frame, a wedge bar, a mounting frame and magnesia silicate;

[0006] The connection assembly comprises a connecting pipe, a branch pipe, a sealing plate and a connecting plate.

[0007] Preferably, the fixing frames are installed on both sides of the air duct, and a plurality of equally spaced wedge strips are laterally installed on the upper ends and both sides of the two fixing frames at the far ends. The outer side surfaces of the installation frames are provided with installation grooves that cooperate with the wedge strips, and the two installation frames are placed on both sides of the air duct, and the magnesia silicate is fixed to the inner wall of the installation frame.

[0008] Preferably, the connecting pipe is placed in the middle of the outer side of the air duct, and the two sides of the connecting pipe are fixedly connected to the air duct through rectangular flanges, the branch pipes are placed at the front and rear ends of the middle of the connecting pipe, and the two proximal ends of the air ducts pass through the connecting pipe and are fixedly connected to the inner wall of the air duct through bolts, a maintenance port is opened in the middle of the bottom surface of the air duct and the connecting pipe, the sealing plate is placed inside the air duct, and the sealing plate abuts against the top surface of the maintenance port, the connecting plate is installed in the middle of the bottom surface of the connecting pipe by bolts, and a sealing component and a driving component are provided inside the connecting pipe;

[0009] The sealing assembly comprises a sealing plate, a connecting frame, a guide rod, a baffle, a sealing strip plate and a spring;

[0010] The driving assembly comprises a guide rail, a rack, a gear set, a driving gear and a stepping motor.

[0011] Preferably, the sealing plate is installed on adjacent surfaces of two fixing frames, and the sealing plate is vertically provided with a plurality of equidistant ventilation holes, the connecting frame is placed on both sides of the air duct, and the connecting frame is placed between the two sealing plates.

[0012] Preferably, a plurality of equidistant guide openings are vertically opened on the sides of the two connecting frames, the guide rods are placed in the guide openings, the baffles are installed on the proximal ends of the guide rods on both sides, the sealing strips are fixedly connected to the outer sides of the plurality of vertical guide rods, and the sealing strips are matched with the vents, the springs are sleeved on the outer sides of the guide rods, and the springs are placed between the connecting frame and the sealing strips on the same side.

[0013] Preferably, the guide rail is longitudinally installed on both sides of the inside of the air duct, and the guide rail is placed between two sealing plates, the rack is longitudinally installed on the top surface of the connecting frame, the lower end of the connecting frame is placed in the guide rail, and two gear sets are respectively provided at the proximal ends of the two racks, the racks are meshed with the gear sets for transmission, the two gear sets are respectively placed at the front and rear ends, the driving gear is placed between the two gear sets, and the driving gear is meshed with the two gear sets for transmission, the output shaft of the stepper motor is connected to the driving gear, and the stepper motor is installed in the middle of the top surface of the connecting pipe

[0014] Preferably, the rack, the gear set and the driving gear are placed between the connecting pipe and the air duct, and the gear set and the driving gear are rotatably connected to the air duct.

[0015] Preferably, the sealing strips on both sides are provided with installation grooves vertically at the far ends thereof, a flame retardant bag is installed in the installation groove, the flame retardant bag is filled with flame retardant, an installation strip is vertically fixed in the vent, a plurality of equidistant needles are vertically provided at the proximal ends of the installation strip and the flame retardant bag, and the needles are fixed to the installation strip.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the cooperation of the slider and the sliding mouth makes it easy to quickly install and lift the air duct, thereby improving the convenience of air duct installation; the cooperation of the wedge strip and the fixing frame makes it easy to install the siliceous magnesium rock after the air duct is lifted, thereby reducing the weight when lifting the air duct and thus improving the efficiency of installing the air duct; the cooperation of the connecting pipe and the branch pipe makes it easy to connect with the branch pipes of other routes, and the cooperation of the connecting plate and the sealing plate makes it easy to repair and inspect the sealing components inside the air duct, thereby improving the safety inside the air duct; the cooperation of the rack, the gear set and the driving gear makes it easy to control the movement of the sealing strip plate, thereby controlling the flow of air in the air duct; the cooperation of the sealing plate and the sealing strip plate makes it easy to isolate the air in the air duct, thereby effectively suppressing the spread of fire; the cooperation of the spring and the needle makes it easy to puncture the flame retardant bag, thereby spraying the flame retardant, thereby achieving the effect of extinguishing the fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the overall three-dimensional structure of the present invention when viewed from above;

[0020] Figure 3 It is a schematic diagram of the overall main cross-sectional three-dimensional structure of the present invention;

[0021] Figure 4 It is a schematic diagram of the overall side cross-sectional three-dimensional structure of the present invention;

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the air duct and the lifting assembly of the present invention;

[0023] Figure 6 It is a schematic diagram of the cross-sectional three-dimensional structure of the air duct and the lifting assembly of the present invention;

[0024] Figure 7 It is a schematic diagram of the three-dimensional structure of the lifting assembly of the present invention;

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the connection assembly of the present invention;

[0026] Fig. 9 It is a schematic diagram of the internal three-dimensional structure of the connection assembly of the present invention;

[0027] Fig.10 It is a schematic diagram of the three-dimensional structure of the sealing assembly and the driving assembly of the present invention;

[0028] Fig.11 It is a schematic diagram of the three-dimensional structure of the driving component of the present invention;

[0029] Fig.12 It is a schematic diagram of the cross-sectional three-dimensional structure of the sealing component of the present invention;

[0030] Fig.13 For the present invention Figure 6 A schematic diagram of the enlarged structure of the middle A part;

[0031] Fig.14 For the present invention Fig.12 Schematic diagram of the enlarged structure of part B in the middle.

[0032] The serial numbers in the figure are: 1. air duct; 2. sliding mouth; 3. supporting plate; 4. sliding block; 5. vertical pole; 6. fixing frame; 7. wedge strip; 8. installation frame; 9. siliceous magnesium rock; 10. connecting pipe; 11. branch pipe; 12. sealing plate; 13. connecting plate; 14. sealing plate; 15. vent; 16. connecting frame; 17. guide rail; 18. rack; 19. gear set; 20. driving gear; 21. stepping motor; 22. guide rod; 23. baffle; 24. sealing strip plate; 25. spring; 26. flame retardant bag; 27. installation strip; 28. needle. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] Example 1: See Figure 1-14The present invention relates to an environmentally friendly and heat-insulating magnesia-silicon fire-proof composite air duct, comprising an air duct 1, wherein sliding openings 2 are horizontally provided at the front and rear ends of both sides of the bottom surface of the air duct 1, and lifting components are provided below both sides of the air duct 1, and the lifting components comprise a supporting plate 3, a sliding block 4 and a vertical rod 5; the supporting plate 3 is longitudinally arranged at the lower end of the air duct 1, the sliding block 4 is placed in the sliding opening 2, and the sliding block 4 is installed on the top surface of the supporting plate 3, and straight grooves are provided at both ends of the supporting plate 3, the lower ends of the vertical rods 5 are installed in the straight grooves, and the upper ends of the vertical rods 5 are installed on the ceiling through circular flanges; flame-retardant components are provided on both sides of the air duct 1, and a connecting component is provided in the middle of the air duct 1; the air duct 1 is conveniently lifted by the lifting component, and then the lifting component is conveniently connected to the air duct 1 quickly by the sliding opening 2 and the sliding block 4, thereby improving the convenience of installation, and then improving The installation efficiency is improved; the flame retardant component includes a fixed frame 6, a wedge strip 7, an installation frame 8 and a silica-magnesium rock 9; the flame retardant component is used to enhance the heat resistance of the air duct 1, thereby increasing the service life of the air duct 1; the connecting component includes a connecting pipe 10, a branch pipe 11, a sealing plate 12 and a connecting plate 13, and the air duct 1 is conveniently connected to the air duct 1 of other routes through the connecting component; the fixed frame 6 is installed on both sides of the inside of the air duct 1, and a plurality of equidistant wedge strips 7 are transversely installed on the upper ends and both sides of the two fixed frames 6 at the far ends, and the outer side surface of the installation frame 8 is provided with an installation groove matched with the wedge strip 7, and the two installation frames 8 are placed on both sides of the inside of the air duct 1, and the silica-magnesium rock 9 is fixed to the inner wall of the installation frame 8, and the wedge strip 7 is used to facilitate the rapid positioning of the installation frame 8, and the silica-magnesium rock 9 is used to facilitate the improvement of the heat resistance of the air duct 1.

[0035] Embodiment 2: The technical solution is basically the same as that of Embodiment 1, except that Figure 8 , Fig. 9 , Fig.10As shown, the connecting pipe 10 is placed in the middle of the outer side of the air duct 1, and the two sides of the connecting pipe 10 are fixedly connected to the air duct 1 through rectangular flanges, the branch pipe 11 is placed in the front and rear ends of the middle of the connecting pipe 10, and the proximal ends of the two air ducts 1 pass through the connecting pipe 10 and are fixedly connected to the inner wall of the air duct 1 through bolts, and a maintenance port is opened in the middle of the bottom surface of the air duct 1 and the connecting pipe 10, the sealing plate 12 is placed inside the air duct 1, and the sealing plate 12 abuts on the top surface of the maintenance port, the connecting plate 13 is installed in the middle of the bottom surface of the connecting pipe 10 by bolts, and a sealing component and a driving component are provided inside the connecting pipe 10; the branch pipe 11 is convenient for connecting the air duct 1 of the main route with the air duct 1 of other routes, and the sealing component and the driving component are convenient for installation and maintenance through the maintenance port, and the sealing plate 12 and the connecting plate 13 are convenient for sealing the maintenance port; the sealing component includes a sealing plate 1 4. A connecting frame 16, a guide rod 22, a baffle 23, a sealing strip plate 24 and a spring 25; the sealing assembly is used to isolate the gas flow when a fire occurs in the air duct 1, thereby effectively suppressing the spread of the fire; the driving assembly includes a guide rail 17, a rack 18, a gear set 19, a driving gear 20 and a stepping motor 21; the driving assembly is used to control the opening or closing of the sealing assembly, thereby facilitating the adjustment of the wind speed inside the air duct 1; the sealing plate 14 is installed on the adjacent surfaces of the two fixed frames 6, and the sealing plate 14 is vertically provided with a plurality of equidistant vents 15, the connecting frame 16 is placed on both sides of the air duct 1, and the connecting frame 16 is placed between the two sealing plates 14; the sealing plate 14 is used to seal the inside of the air duct 1, the vents 15 are used to facilitate the gas flow, and the connecting frame 16 is used to facilitate the connection of the guide rod 22.

[0036] Embodiment 3: The technical solution is basically the same as that of Embodiment 1, except that Fig.11 , Fig.12 , Fig.13As shown, the two connecting frames 16 have multiple equidistant guide openings vertically opened on the sides, the guide rods 22 are placed in the guide openings, the baffles 23 are installed at the proximal ends of the guide rods 22 on both sides, the sealing strips 24 are fixedly connected to the outer sides of the multiple vertical guide rods 22, and the sealing strips 24 are matched with the vents 15, the springs 25 are sleeved on the outer sides of the guide rods 22, and the springs 25 are placed between the connecting frame 16 on the same side and the sealing strips 24; the sealing strips 24 are pushed by the guide rods 22 and the springs 25, and then the sealing strips 24 are sealed with the sealing plate 14 inside the air duct 1, thereby controlling the air duct 1 inside. The guide rail 17 is longitudinally installed on both sides of the air duct 1, and the guide rail 17 is placed between the two sealing plates 14. The rack 18 is longitudinally installed on the top surface of the connecting frame 16. The lower end of the connecting frame 16 is placed in the guide rail 17. Two gear sets 19 are respectively provided at the proximal ends of the two racks 18. The racks 18 are meshed with the gear sets 19 for transmission. The two gear sets 19 are respectively placed at the front and rear ends. The driving gear 20 is placed between the two gear sets 19, and the driving gear 20 is meshed with the two gear sets 19 for transmission. The output shaft of the stepper motor 21 is connected to the driving gear 20, and the stepper motor 21 is connected to the driving gear 20. The stepping motor 21 is installed in the middle of the top surface of the connecting pipe 10; the guide rail 17 is used to control the movement and guidance of the connecting frame 16, and the driving gear 20 is controlled by the stepping motor 21 to rotate, thereby controlling the rotation of the front and rear end gear sets 19, thereby controlling the movement of the rack 18, and then controlling the movement of the connecting frame 16. The gap between the sealing plate 14 and the sealing strip plate 24 is controlled by the movement of the connecting frame 16; the rack 18, the gear set 19 and the driving gear 20 are placed between the connecting pipe 10 and the air duct 1, and the gear set 19 and the driving gear 20 are rotatably connected to the air duct 1; both sides A mounting groove is vertically provided at the far end of the sealing strip 24, in which a flame retardant bag 26 is installed, and the flame retardant bag 26 is filled with flame retardant, and a mounting strip 27 is vertically fixed in the vent 15, and a plurality of equidistant needles 28 are vertically provided at the proximal end of the mounting strip 27 and the flame retardant bag 26, and the needles 28 are fixed on the mounting strip 27; the flame retardant bag 26 is exposed by the movement of the sealing strip 24, and then the flame retardant bag 26 is pushed outward by the spring 25, so that it collides with the needles 28, and then the flame retardant in the flame retardant bag 26 is sprayed out, thereby achieving the effect of suppressing the fire.

[0037] Working principle: In this embodiment, the present invention also proposes a method for using an environmentally friendly and heat-insulating magnesium silicate fireproof composite air duct, comprising the following steps:

[0038] Step 1: first place the slider 4 in the sliding opening 2, then connect the slider 4 with the supporting plate 3, then fix the two ends of the supporting plate 3 to the vertical pole 5, and then install the vertical pole 5 on the ceiling through the circular flange, so as to lift the air duct 1; quickly install the installation frame 8 on both sides of the inside of the air duct 1 through the wedge strip 7, so as to install the siliceous magnesium rock 9 on both sides of the inside of the air duct 1, and then connect the air duct 1 lifted by other routes through the branch pipe 11, and then connect the stepper motor 21 with the wire and power it on, that is, the installation of the air duct 1 is completed;

[0039] Step 2: When a fire occurs inside one of the air ducts 1 in the route, the stepper motor 21 is started, and the stepper motor 21 controls the driving gear 20 to rotate. The front and rear ends of the driving gear 20 are meshed with the gear set 19, thereby controlling the gear set 19 to rotate. The gear set 19 is meshed with the rack 18, and the rack 18 is fixedly connected to the connecting frame 16, thereby controlling the connecting frame 16 to move. The lower end of the connecting frame 16 is placed in the guide rail 17, thereby controlling the connecting frame 16 to move longitudinally inside the air duct 1.

[0040] Step 3: When the connecting frame 16 moves, the guide rod 22 installed on the connecting frame 16 is controlled to move, thereby controlling the sealing strip 24 to move. When the sealing strip 24 does not move, it abuts against the sealing plate 14. When the sealing strip 24 moves to the vent 15 opened by the sealing plate 14, the sealing strip 24 no longer abuts against the sealing plate 14. The sealing strip 24 is pushed by the spring 25, thereby pushing the sealing strip 24 into the vent 15, thereby blocking the vent 15, thereby isolating the air flow, thereby effectively suppressing the spread of fire;

[0041] Step 4: When the sealing strip 24 is pushed to the vent 15 by the spring 25, the flame retardant bag 26 on the outside of the sealing strip 24 is exposed, and the flame retardant bag 26 contacts the needle 28, so that the flame retardant bag 26 is broken, and the flame retardant inside the flame retardant bag 26 is ejected, thereby preventing the fire from spreading, and the air flow is isolated, thereby achieving the effect of extinguishing the fire;

[0042] Step five, when the fire is extinguished, control the stepper motor 21 to rotate in the opposite direction, and then control the racks 18 on both sides to move in the opposite direction, thereby controlling the connecting frame 16 to move in the opposite direction. The sealing strips 24 are arc-shaped on both sides. When the sealing strips 24 move, the side surfaces of the sealing strips 24 will collide with the inner wall of the vent 15, thereby controlling the sealing strips 24 on both sides to approach each other. At this time, the springs 25 are in a compressed state; then open the sealing plate 12 and the connecting plate 13, and put the new flame retardant bag 26 into the installation groove.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An environmentally friendly and heat-insulating magnesium silicate fireproof composite air duct, comprising an air duct (1), characterized in that: The front and rear ends of both sides of the bottom surface of the air duct (1) are transversely provided with sliding openings (2), and lifting components are provided below both sides of the air duct (1), and the lifting components include a supporting plate (3), a slider (4) and a vertical rod (5); the supporting plate (3) is longitudinally arranged at the lower end of the air duct (1), the slider (4) is placed in the sliding opening (2), and the slider (4) is installed on the top surface of the supporting plate (3), and straight grooves are opened at both ends of the supporting plate (3), the lower end of the vertical rod (5) is installed in the straight groove, and the upper end of the vertical rod (5) is installed on the ceiling through a circular flange; flame retardant components are provided on both sides of the inside of the air duct (1), and a connecting component is provided in the middle of the air duct (1); the flame retardant component includes a fixing frame (6), a wedge strip (7), a mounting frame (8) and magnesia (9); the connecting component includes a connecting pipe (10), a branch pipe (11), a sealing plate (12) and a connecting plate (13).

2. The environmentally friendly and heat-insulating magnesium silicate fireproof composite air duct according to claim 1, characterized in that: The fixing frames (6) are installed on both sides of the air duct (1), and a plurality of equally spaced wedge strips (7) are transversely installed on the upper ends and both sides of the two fixing frames (6) at the far ends. The outer side surfaces of the installation frames (8) are provided with installation grooves that cooperate with the wedge strips (7), and the two installation frames (8) are placed on both sides of the air duct (1), and the magnesia silicate (9) is fixed to the inner wall of the installation frames (8).

3. The environmentally friendly and heat-insulating magnesium silicate fireproof composite air duct according to claim 1, characterized in that: The connecting pipe (10) is arranged in the middle of the outer side of the air duct (1), and the two sides of the connecting pipe (10) are fixedly connected to the air duct (1) by means of rectangular flanges; the branch pipe (11) is arranged at the front and rear ends of the middle of the connecting pipe (10), and the adjacent ends of the two air ducts (1) pass through the connecting pipe (10) and are fixedly connected to the inner wall of the air duct (1) by means of bolts; a maintenance opening is provided in the middle of the bottom surface of the air duct (1) and the connecting pipe (10); the sealing plate (12) is arranged inside the air duct (1), and the sealing plate (12) abuts against the top surface of the maintenance opening; the connecting plate (13) is installed in the middle of the bottom surface of the connecting pipe (10) by means of bolts; and a sealing component and a driving component are provided inside the connecting pipe (10).

4. The environmentally friendly and heat-insulating magnesium silicate fireproof composite air duct according to claim 3, characterized in that: The sealing assembly comprises a sealing plate (14), a connecting frame (16), a guide rod (22), a baffle (23), a sealing strip plate (24) and a spring (25); the sealing plate (14) is mounted on adjacent surfaces of two fixing frames (6), and the sealing plate (14) is vertically provided with a plurality of equidistant ventilation openings (15); the connecting frame (16) is placed on both sides of the inside of the air duct (1), and the connecting frame (16) is placed between the two sealing plates (14).

5. The environmentally friendly and heat-insulating magnesium silicate fireproof composite air duct according to claim 3, characterized in that: The two connecting frames (16) are provided with a plurality of equally spaced guide openings in a vertical direction on the side surfaces, the guide rods (22) are placed in the guide openings, the baffles (23) are installed at the proximal ends of the guide rods (22) on both sides, the sealing strips (24) are fixedly connected to the outer sides of the plurality of vertical guide rods (22), and the sealing strips (24) are matched with the ventilation openings (15), the springs (25) are sleeved on the outer sides of the guide rods (22), and the springs (25) are placed between the connecting frame (16) and the sealing strips (24) on the same side.

6. The environmentally friendly and heat-insulating magnesium silicate fireproof composite air duct according to claim 3, characterized in that: The driving assembly comprises a guide rail (17), a rack (18), a gear set (19), a driving gear (20) and a stepping motor (21). The guide rail (17) is longitudinally mounted on both sides of the inside of the air duct (1), and the guide rail (17) is placed between two sealing plates (14). The rack (18) is longitudinally mounted on the top surface of the connecting frame (16), and the lower end of the connecting frame (16) is placed in the guide rail (17). Two gear sets (19) are respectively provided at the proximal ends of the two racks (18). The racks (18) mesh with the gear sets (19) for transmission. The two gear sets (19) are respectively placed at the front and rear ends. The driving gear (20) is placed between the two gear sets (19), and the driving gear (20) meshes with the two gear sets (19) for transmission. The output shaft of the stepping motor (21) is connected to the driving gear (20), and the stepping motor (21) is mounted at the middle of the top surface of the connecting pipe (10).

7. The environmentally friendly and heat-insulating magnesium silicate fireproof composite air duct according to claim 6, characterized in that: The rack (18), the gear set (19) and the driving gear (20) are disposed between the connecting pipe (10) and the air duct (1), and the gear set (19) and the driving gear (20) are rotatably connected to the air duct (1).

8. The environmentally friendly and heat-insulating magnesium silicate fireproof composite air duct according to claim 4, characterized in that: The sealing strips (24) on both sides are provided with installation grooves at the far ends thereof, and a flame retardant bag (26) is installed in the installation grooves. The flame retardant bag (26) is filled with a flame retardant. A installation strip (27) is vertically fixed in the vent (15). A plurality of equidistant needles (28) are vertically provided at the ends thereof near the flame retardant bag (26), and the needles (28) are fixed on the installation strip (27).

Images