A composite muffler

Abstract

The invention discloses a novel composite silencer, which relates to the technical field of boiler silencers. The invention comprises a double-layer sound-receiving tube with a pit on the inner side. The sound-receiving tube can be stretched and compressed. By changing the bending radius of the sound-receiving tube and the angle between the direction of the sound wave and the inner wall of the sound-receiving tube, the absorption of noises of different degrees is achieved. The invention also comprises an air storage barrel. A sliding piston is slidingly arranged inside the air storage barrel. The movement of the sliding piston ensures that the air pressure of the outer shell and the inner shell is stable. Both the outer shell and the inner shell are in a state close to a vacuum. The arrangement of the device of the invention can effectively absorb high-energy sound waves in the face of large airflow, and eliminate them in a targeted manner according to the high and low frequencies of the sound.

Description

Technical Field

[0001] The invention relates to the technical field of boiler mufflers, and in particular to a composite muffler. Background Art

[0002] Boiler room noise control refers to the process of using various methods to keep the noise generated by boiler room facilities during operation within the allowable range. It is an important part of noise control in the metallurgical industry. The noise of the boiler blower and induced draft fan (smoke exhaust fan) and the noise of its transmission motor. Both blowers and induced draft fans are centrifugal fans. Including: aerodynamic noise radiated from the air inlet and outlet; mechanical noise radiated from the casing, pipe wall and motor bearings; solid sound caused by foundation vibration. Among them, the aerodynamic noise of the air inlet and outlet is the strongest. Muffler, as a main muffler functional component, is widely used in various fields, such as exhaust muffler for engines. Muffler meets the needs of green environmental protection and can significantly reduce the pollution of noise to the surrounding environment. Common mufflers are divided into three types: resistive muffler, reactive muffler and impedance composite muffler. The muffler function of resistive and reactive mufflers is single and limited. Among them, resistive muffler has a better muffler effect on high-frequency noise, and reactive muffler has a better muffler effect on low-frequency noise. The impedance composite silencer combines the resistive silencer and the reactive silencer in some way to achieve noise reduction in a wider bandwidth. The prior art CN202120863647.2 is an impedance composite silencer that uses the elastic force of the shrapnel itself to fix the silencer cotton roll in the silencer chamber. The operation is simple and convenient. However, since the prior art uses the inner wall to fix the sound insulation material, it cannot effectively absorb high-energy sound waves when facing the noise caused by the vibration of the pipeline by the atmospheric airflow, and cannot eliminate the air in a targeted manner according to the high and low frequencies of the sound. Summary of the invention

[0003] In order to solve the above technical problems, the main technical solutions adopted by the present invention include: a composite silencer, including an outer shell with openings at both ends, and also including an air outlet component with a filtering function installed at one end of the outer shell with the opening, an automatic pressure regulating component is also provided on the side of the outer shell, an inner shell is provided inside the outer shell, the length and width of the inner shell are smaller than the outer shell, a high-temperature air intake detection component is provided at the end of the inner shell away from the air outlet component, a sliding plate is slidably provided at the end of the inner shell close to the air outlet component, a sound receiving tube is fixedly provided on the sliding plate, an air intake frame is provided on the high-temperature air intake detection component, the air intake frame is fitted with the opening of the outer shell close to the high-temperature air intake detection component, the other end of the sound receiving tube is fixedly installed on the extrusion plate, and the high-temperature gas flows in through the high-temperature air intake detection component, and then is discharged through the air outlet component after being silenced by the sound receiving tube.

[0004] Furthermore, the sound receiving tube is double-layered, and a plurality of pits are arranged on the inner wall of the sound receiving tube for sound absorption. The sliding plate is driven to slide by the voltage regulating component, so that the sliding plate drives the sound receiving tube to stretch. When the sound receiving tube is stretched, the bending radius is smaller, and when the sound receiving tube is squeezed, the bending radius is larger. When the bending radius is smaller, the inner wall of the sound receiving tube is closer to perpendicularity with the direction of the sound wave, and the sound absorption effect is more obvious.

[0005] Furthermore, the space between the outer shell and the inner shell is close to a vacuum, the air content is minimized, and the shell is filled with sound insulation cotton, and the interior of the inner shell is close to a vacuum.

[0006] Furthermore, the air outlet assembly includes a filter plate installed on the outer shell, an air outlet plate is arranged inside the filter plate, a filter motor is arranged on the air outlet plate, a centrifugal plate is coaxially arranged on the output shaft of the filter motor, and the filter plate fits with the opening on the outer shell.

[0007] Furthermore, the high-temperature air intake detection component includes an L-shaped detection plate installed on the inner shell and fitted with one end of the sound receiving tube, an extrusion plate is arranged on the front end of the L-shaped detection plate, two groups of low-end detection blocks are arranged between the extrusion plate and the L-shaped detection plate, an air intake frame is arranged on the extrusion plate, and multiple groups of movable vertical plates are slidingly arranged inside the air intake frame, and vertical plate springs are arranged on the multiple groups of movable vertical plates. Side detection blocks are arranged between the air intake frame and the side of the L-shaped detection plate, an extrusion electric cylinder is arranged on the air intake frame, an extrusion shaft is arranged on the extrusion electric cylinder, and the extrusion shaft is connected to a group of movable vertical plates closest to the side detection block, and an air inlet is arranged on the air intake frame. The movable vertical plates in the high-temperature detection component are adjusted in position by the extrusion electric cylinder. The greater the wind speed, the higher the internal temperature of the extrusion electric cylinder, and the larger the spacing between the movable vertical plates, thereby reducing wind resistance.

[0008] Furthermore, one end of the plurality of groups of movable vertical plates close to the extrusion electric cylinder is close to the air intake frame, and one end of the plurality of groups of movable vertical plates away from the extrusion electric cylinder is close to the extrusion plate.

[0009] Furthermore, the automatic pressure regulating assembly includes a fixed plate installed on the upper end of the outer shell, an upper pressure regulating plate is provided at the lower end of the fixed plate, an upper cylinder is provided at the upper end of the fixed plate, an air supply pipe 1 is provided on the upper cylinder, an air storage barrel is also provided on the side of the outer shell, the upper cylinder is connected to the air storage barrel through an air supply pipe 1, a sliding piston is slidingly provided inside the air storage barrel, a pushing cylinder 1 is provided on the side of the middle section of the air storage barrel, an air supply pipe 2 is provided at the lower end of the air storage barrel, a pushing cylinder 2 is provided inside the inner shell, one end of the pushing cylinder 2 is connected to the sliding plate, the other end of the pushing cylinder 2 is connected to the air storage barrel through the air supply pipe 2, and a deceleration assembly is provided at the rear end of the pushing cylinder 1.

[0010] Furthermore, the reduction assembly includes a rotating motor installed on the outer shell, a rotating gear 1 is provided on the output shaft of the rotating motor, a connecting plate is provided on the outer shell, a circular hole is provided on the connecting plate, the circular hole is coaxial with the rotating gear, multiple groups of rotating gears 2 are evenly distributed on the circular hole of the connecting plate, the multiple groups of rotating gears 2 are all meshed with the rotating gear 1, a rotating disk is also provided on the outer shell, the rotating disk is coaxially installed with the rotating motor, and teeth are provided inside the rotating disk, one end of the rotating gear 2 is meshed with the rotating gear 1, and the other end of the rotating gear 2 is meshed with the rotating disk, a lead screw is provided at the rear end of the rotating disk, a driving shaft is slidably provided on the lead screw, the lower end of the driving shaft is connected to the lead screw, and the upper end of the driving shaft is slidably connected to the driving cylinder 1.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention has an air outlet component with a filtering function, which can centrifugally filter and discharge the gas while silencing the gas; 2. The present invention can automatically adjust the distance between the moving vertical plates through the high-temperature detection component, reduce wind resistance, and detect the air volume; 3. The present invention can ensure that the outer shell and the inner shell will not be damaged while ensuring a near vacuum through the automatic pressure regulating component, and always keep the air pressure of the outer shell and the inner shell stable; 4. The present invention can perform targeted silencing according to the high and low frequencies of the sound through the expandable and compressible sound receiving tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention.

[0013] Figure 2 The overall structure of the device is partially schematically shown in FIG. Figure 1 .

[0014] Figure 3 The overall structure of the device is partially schematically shown in FIG. Figure 2 .

[0015] Figure 4 It is a schematic diagram of the structure of the deceleration assembly of the present invention.

[0016] Figure 5 A partial schematic diagram of the deceleration assembly structure of the present invention

[0017] Figure 6 It is a schematic diagram of the structure of the high temperature detection component of the present invention.

[0018] Figure 7 The local structure of the high temperature detection component of the present invention is shown in FIG. Figure 1 .

[0019] Figure 8 The local structure of the high temperature detection component of the present invention is shown in FIG. Figure 2.

[0020] Fig. 9 The local structure of the high temperature detection component of the present invention is shown in FIG. Figure 3 .

[0021] Fig.10 The local structure of the high temperature detection component of the present invention is shown in FIG. Figure 4 .

[0022] Figure numbers: 1-housing; 2-air outlet plate; 3-filter plate; 4-filter motor; 5-fixed plate; 6-upper cylinder; 7-gas pipe 1; 8-gas storage tank; 9-gas pipe 2; 10-sliding piston; 11-pushing cylinder 1; 12-pushing shaft; 13-rotating motor; 14-rotating plate; 15-screw; 16-centrifugal plate; 17-inner housing; 18-intake frame; 19-upper pressure regulating plate; 20-receiving tube; 21-sliding plate; 22-connecting plate; 23-rotating gear 2; 26-rotating gear 1; 27-L-type detection plate; 28-extrusion plate; 29-side detection block; 30-extrusion electric cylinder; 31-extrusion shaft; 32-moving vertical plate; 33-vertical plate spring; 34-low-end detection block; 35-pushing cylinder 2. DETAILED DESCRIPTION

[0023] In the following description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] In the following description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The present invention will be further described below in conjunction with the accompanying drawings and exemplary embodiments, and the illustrative embodiments and description of the present invention are used to explain the present invention, but are not intended to limit the present invention. In addition, if the detailed description of the known technology is unnecessary for illustrating the features of the present invention, it will be omitted.

[0026] Example: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 、 Figure 8 、 Fig. 9 、 Fig.10The composite muffler shown includes an outer shell 1 with openings at both ends, an air outlet component with a filtering function installed at one end of the outer shell 1 with the opening, an automatic pressure regulating component is also provided on the side of the outer shell 1, an inner shell 17 is provided inside the outer shell 1, the length and width of the inner shell 17 are smaller than the outer shell 1, the space between the outer shell 1 and the inner shell 17 is close to vacuum, the air content is minimized, and it is filled with sound insulation cotton, the interior of the inner shell 17 is close to vacuum, a high-temperature air intake detection component is provided at the end of the inner shell 17 away from the air outlet component, a sliding plate 21 is slidably provided at the end of the inner shell 17 close to the air outlet component, a sound receiving tube 20 is fixedly provided on the sliding plate 21, an air intake frame 18 is provided on the high-temperature air intake detection component, and the air intake frame 18 is connected to the outer shell 1 close to the high-temperature The opening of the air intake detection component is fitted, and the other end of the sound receiving tube 20 is fixedly mounted on the extrusion plate 28. The sound receiving tube 20 is double-layered, and a plurality of pits are arranged on the inner wall of the sound receiving tube 20 for sound absorption. The sliding plate 21 is driven to slide by the pressure regulating component, so that the sliding plate 21 drives the sound receiving tube 20 to stretch. When the sound receiving tube 20 is stretched, the bending radius is smaller, and when the sound receiving tube 20 is squeezed, the bending radius is larger. When the bending radius is smaller, the inner wall of the sound receiving tube 20 is closer to being perpendicular to the direction of the sound wave. The air outlet component includes a filter plate 3 mounted on the outer shell 1, and an air outlet plate 2 is arranged inside the filter plate 3. A filter motor 4 is arranged on the air outlet plate 2, and a centrifugal plate 16 is coaxially arranged on the output shaft of the filter motor 4. The filter plate 3 fits the opening on the outer shell 1. The high-temperature air intake detection component includes an L-shaped detection plate 27 installed on the inner shell 17 and fitted with one end of the sound receiving tube 20, a squeezing plate 28 is arranged on the front end of the L-shaped detection plate 27, two groups of low-end detection blocks 34 are arranged between the squeezing plate 28 and the L-shaped detection plate 27, an air intake frame 18 is arranged on the squeezing plate 28, a plurality of groups of movable vertical plates 32 are slidably arranged inside the air intake frame 18, vertical plate springs 33 are arranged on the plurality of groups of movable vertical plates 32, a side detection block 29 is arranged between the air intake frame 18 and the side of the L-shaped detection plate 27, an squeezing electric cylinder 30 is arranged on the air intake frame 18, an squeezing shaft 31 is arranged on the squeezing electric cylinder 30, the squeezing shaft 31 is connected to a group of movable vertical plates 32 closest to the side detection block 29, and the air intake frame 18 is provided with a plurality of movable vertical plates 32 on the air intake frame 18. An air inlet is provided, and one end of a plurality of groups of movable vertical plates 32 close to the extrusion electric cylinder 30 is close to the air inlet frame 18, and one end of a plurality of groups of movable vertical plates 32 away from the extrusion electric cylinder 30 is close to the extrusion plate 28. When high-temperature gas enters the air inlet frame 18, the high-temperature gas impacts the extrusion electric cylinder 30, so that the pressure inside the extrusion electric cylinder 30 increases, and the extrusion electric cylinder 30 drives a movable vertical plate 32 closest to the side detection block 29 to move, and the sliding plate 21 adjusts the movement of the remaining movable vertical plates 32 through the vertical plate spring 33. The high-temperature gas blows the air inlet frame 18 so that the air inlet frame 18 squeezes the L-shaped detection plate 27, and the extension length of the sound receiving tube 20 and the stability of the air pressure in the outer shell 1 and the inner shell 17 are determined by the data of the side detection block 29 and the low-end detection block 34.The automatic pressure regulating assembly includes a fixed plate 5 installed at the upper end of the outer shell 1, an upper pressure regulating plate 19 is arranged at the lower end of the fixed plate 5, an upper cylinder 6 is arranged at the upper end of the fixed plate 5, and a gas pipe 7 is arranged on the upper cylinder 6. A gas storage barrel 8 is also arranged on the side of the outer shell 1, and the upper cylinder 6 is connected to the gas storage barrel 8 through a gas pipe 7. A sliding piston 10 is slidingly arranged inside the gas storage barrel 8, and a push cylinder 11 is arranged on the side of the middle section of the gas storage barrel 8. A gas pipe 29 is arranged at the lower end of the gas storage barrel 8, and a push cylinder 235 is arranged inside the inner shell 17. One end of the push cylinder 235 is connected to the sliding plate 21, and the other end of the push cylinder 235 is connected to the gas storage barrel through the gas pipe 29. 8 is connected, when the internal air pressure of the push cylinder 11 is changed, the push cylinder 11 pushes the sliding piston 10 to slide in the air storage barrel 8, and the inside of the outer shell 1 and the inner shell 17 are both in a state close to vacuum. When the push cylinder 2 35 pushes the sliding plate 21 to move, so that the sliding plate 21 stretches and compresses the sound receiving tube 20, the internal air pressure of the outer shell 1 and the inner shell 17 will deviate. If it is not adjusted in time, it will cause the inner shell to deform. Therefore, when the sliding piston 10 pushes the push cylinder 2 35 to move through the air supply pipe 2 9, the air storage barrel 8 drives the upper end cylinder 6 to drive the upper end pressure regulating plate 19 to move through the air supply pipe 1 7, so as to ensure that the internal pressure values ​​of the outer shell 1 and the inner shell 17 remain unchanged. , a reduction assembly is arranged at the rear end of the push cylinder 11; the reduction assembly comprises a rotating motor 13 mounted on the housing 1, a rotating gear 26 is arranged on the output shaft of the rotating motor 13, a connecting plate 22 is arranged on the housing 1, a circular hole is arranged on the connecting plate 22, the circular hole is coaxial with the rotating gear 26, a plurality of groups of rotating gears 23 are evenly distributed on the circular hole of the connecting plate 22, and the plurality of groups of rotating gears 23 are all meshed with the rotating gear 1 26, a rotating disk 14 is also arranged on the housing 1, the rotating disk 14 is coaxially mounted with the rotating motor 13, and teeth are arranged inside the rotating disk 14, one end of the rotating gear 23 is meshed with the rotating gear 1 26, The other end of the rotating gear 23 meshes with the rotating disk 14. The rear end of the rotating disk 14 is provided with a lead screw 15. The driving shaft 12 is slidably provided on the lead screw 15. The lower end of the driving shaft 12 is connected to the lead screw 15. The upper end of the driving shaft 12 is slidably connected to the driving cylinder 11. The rotating motor 13 drives the rotating gear 1 26 to rotate. The rotating gear 1 26 drives the three sets of rotating gears 23 installed on the connecting plate 22 to rotate, so that the rotating disk 14 rotates. The rotating disk 14 drives the lead screw 15 to rotate. When the lead screw 15 rotates, it drives the driving shaft 12 to slide on the lead screw 15. At the same time, the driving shaft 12 slides in the driving cylinder 11 to change the air pressure in the driving cylinder 11. ;

[0027] Working principle: When working, the end of the housing 1 close to the air inlet frame 18 is installed on the boiler outlet, and the high-temperature gas in the boiler is blown out. When the high-temperature gas enters the air inlet frame 18, the high-temperature gas impacts the extrusion electric cylinder 30, so that the pressure inside the extrusion electric cylinder 30 increases, and the extrusion electric cylinder 30 drives a moving vertical plate 32 closest to the side detection block 29 to move. The sliding plate 21 adjusts the movement of the remaining moving vertical plates 32 through the vertical plate spring 33. The high-temperature gas blows the air inlet frame 18 to squeeze the L-shaped detection plate 27. The side detection block 29 and the low-end detection block 34 are squeezed and the data is analyzed to determine the extension and retraction degree of the sound receiving tube 20. The side detection block 29 and the low-end detection block 34 transmit digital signals to the rotating motor 13, so that the rotating motor 13 drives the rotating gear 1 26 to rotate, and the rotating gear 1 26 drives the three sets of rotating gears 2 23 installed on the connecting plate 22 to rotate, so that the rotating disk 14 rotates, and the rotating disk 14 drives the lead screw 15 to rotate. When the lead screw 15 rotates, it drives the driving shaft 12 to slide on the lead screw 15, and at the same time, the driving shaft 12 drives the air in the driving air. The outer shell 1 and the inner shell 17 are both in a state of near vacuum. When the push cylinder 2 35 pushes the sliding plate 21 to move, so that the sliding plate 21 stretches and compresses the sound receiving tube 20, the inner shell 1 and the outer shell 17 will have internal pressure deviations. If not adjusted in time, the inner shell will be deformed. Therefore, when the sliding piston 10 pushes the push cylinder 2 35 to move through the air pipe 2 9, the air storage barrel 8 The upper cylinder 6 drives the upper pressure regulating plate 19 to move through the air supply pipe 7, so as to ensure that the internal pressure values ​​of the outer shell 1 and the inner shell 17 remain unchanged and prevent the shell from being damaged. Then the gas is discharged from the end of the sound receiving tube 20 away from the L-shaped detection plate 27, and the gas is discharged into the air outlet plate 2 through the opening of the outer shell 1. At this time, the filter motor 4 drives the centrifugal plate 16 to rotate, and the centrifugal plate 16 centrifugally filters the gas in the air outlet plate 2. The gas in the air outlet plate 2 is discharged through the filter plate 3, and the gas can be filtered while achieving silencing.

[0028] The present invention is not limited to the above specific implementation modes. Various changes made by technicians in the relevant technical field based on the above conception all fall within the protection scope of the present invention.

Claims

1. A composite muffler, comprising a housing (1) with openings at both ends, Features: It also comprises an air outlet component with a filtering function installed at one end of the outer shell (1) with an opening, an automatic pressure regulating component is also arranged on the side of the outer shell (1), an inner shell (17) is arranged inside the outer shell (1), the length and width of the inner shell (17) are smaller than those of the outer shell (1), a high-temperature air intake detection component is arranged at one end of the inner shell (17) away from the air outlet component, a sliding plate (21) is slidably arranged at one end of the inner shell (17) close to the air outlet component, a sound receiving tube (20) is fixedly arranged on the sliding plate (21), an air intake frame (18) is arranged on the high-temperature air intake detection component, the air intake frame (18) is fitted with the opening of the outer shell (1) close to the high-temperature air intake detection component, and the other end of the sound receiving tube (20) is fixedly arranged on the extrusion plate (28); The high-temperature air intake detection assembly comprises an L-shaped detection plate (27) mounted on the inner shell (17) and in contact with one end of the sound receiving tube (20); a pressing plate (28) is arranged at the front end of the L-shaped detection plate (27); two groups of low-end detection blocks (34) are arranged between the pressing plate (28) and the L-shaped detection plate (27); an air intake frame (18) is arranged on the pressing plate (28); a plurality of groups of movable vertical plates (32) are slidably arranged inside the air intake frame (18); and the plurality of groups of movable vertical plates are arranged to move the plurality of movable vertical plates. (32) is provided with a vertical plate spring (33), a side detection block (29) is provided between the air intake frame (18) and the side of the L-shaped detection plate (27), an extrusion electric cylinder (30) is provided on the air intake frame (18), an extrusion shaft (31) is provided on the extrusion electric cylinder (30), the extrusion shaft (31) is connected to a group of movable vertical plates (32) closest to the side detection block (29), and an air inlet is provided on the air intake frame (18); The automatic pressure regulating assembly comprises a fixing plate (5) mounted on the upper end of the housing (1), an upper pressure regulating plate (19) is arranged at the lower end of the fixing plate (5), an upper cylinder (6) is arranged at the upper end of the fixing plate (5), an air supply pipe (7) is arranged on the upper cylinder (6), an air storage barrel (8) is also arranged on the side of the housing (1), the upper cylinder (6) is connected to the air storage barrel (8) through the air supply pipe (7), and a sliding member is arranged inside the air storage barrel (8) A movable piston (10), a push cylinder (11) is arranged on the side of the middle section of the gas storage barrel (8), a gas supply pipe (9) is arranged at the lower end of the gas storage barrel (8), a push cylinder (35) is arranged inside the inner shell (17), one end of the push cylinder (35) is connected to the sliding plate (21), and the other end of the push cylinder (35) is connected to the gas storage barrel (8) through the gas supply pipe (9), and a deceleration component is arranged at the rear end of the push cylinder (11).

2. A composite muffler according to claim 1, Features: The sound receiving tube (20) is double-layered, and a plurality of pits are arranged on the inner wall of the sound receiving tube (20) for sound absorption. The sliding plate (21) is driven to slide by the pressure regulating component, so that the sliding plate (21) drives the sound receiving tube (20) to stretch. When the sound receiving tube (20) is stretched, the bending radius is smaller, and when the sound receiving tube (20) is squeezed, the bending radius is larger. When the bending radius is smaller, the inner wall of the sound receiving tube (20) is closer to being perpendicular to the direction of the sound wave.

3. A composite muffler according to claim 1, Features: The space between the outer shell (1) and the inner shell (17) is close to a vacuum, the air content is minimized, and the space is filled with sound insulation cotton. The interior of the inner shell (17) is close to a vacuum.

4. A composite muffler according to claim 1, Features: The air outlet assembly comprises a filter disc (3) mounted on the outer shell (1), an air outlet disc (2) is arranged inside the filter disc (3), a filter motor (4) is arranged on the air outlet disc (2), a centrifugal disc (16) is coaxially arranged on the output shaft of the filter motor (4), and the filter disc (3) is fitted with an opening on the outer shell (1).

5. A composite muffler according to claim 1, Features: One end of the plurality of movable vertical plates (32) close to the extrusion electric cylinder (30) is close to the air intake frame (18), and one end of the plurality of movable vertical plates (32) away from the extrusion electric cylinder (30) is close to the extrusion plate (28).

6. A composite muffler according to claim 5, Features: The reduction assembly comprises a rotating motor (13) mounted on a housing (1), a rotating gear 1 (26) being arranged on the output shaft of the rotating motor (13), a connecting plate (22) being arranged on the housing (1), a circular hole being arranged on the connecting plate (22), the circular hole being coaxial with the rotating gear 1 (26), a plurality of groups of rotating gear 2 (23) being evenly distributed on the circular hole of the connecting plate (22), the plurality of groups of rotating gear 2 (23) being all meshed with the rotating gear 1 (26), and a rotating disk (14) being also arranged on the housing (1). The rotating disk (14) is coaxially mounted with the rotating motor (13), and teeth are arranged inside the rotating disk (14). One end of the rotating gear 2 (23) is meshed with the rotating gear 1 (26), and the other end of the rotating gear 2 (23) is meshed with the rotating disk (14). A lead screw (15) is arranged at the rear end of the rotating disk (14), and a driving shaft (12) is slidably arranged on the lead screw (15). The lower end of the driving shaft (12) is connected to the lead screw (15), and the upper end of the driving shaft (12) is slidably connected to the driving cylinder 1 (11).

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