An air intake noise reduction device for a pneumatic bending machine and a noise reduction method thereof

Abstract

The present invention discloses an air intake noise reduction device for a pneumatic bending machine and a noise reduction method thereof, belonging to the technical field of bending machines, and comprising an air intake pipe, wherein the upper and lower surfaces of the air intake pipe are both provided with connecting flanges, the inner wall of the air intake pipe is provided with an inner layer, a noise reduction component is provided in the inner layer, and the bottom of the noise reduction component is fixedly connected to the top of the limit component. In the present invention, by providing a connecting baffle, a connecting tube, an air guide ring, a muffler chamber, a vent plate, a first through hole and a second through hole, the change of impedance caused in the process of sound propagation at the air intake of the air intake pipe interface generates reflection and interference of sound energy, reduces the sound energy radiated outward from the air intake pipe, and further improves its noise reduction effect. Due to the provision of two muffler chambers, the airflow can be introduced into the muffler chamber and noise reduction is performed by a sound-absorbing ball. The multi-stage noise reduction method is beneficial to the processing of the bending machine and further optimizes the working environment.

Description

Technical Field

[0001] The invention belongs to the technical field of bending machines, and specifically relates to an air intake noise reduction device for a pneumatic bending machine and a noise reduction method thereof. Background Art

[0002] The bending machine is a machine that can bend thin plates. Its structure mainly includes a bracket, a workbench and a clamping plate. The workbench is placed on the bracket. The workbench is composed of a base and a pressure plate. The base is connected to the clamping plate through a hinge. The base is composed of a base shell, a coil and a cover plate. The coil is placed in the depression of the base shell, and the top of the depression is covered with a cover plate. When in use, the coil is energized by a wire, and after energization, an attractive force is generated on the pressure plate, thereby clamping the thin plate between the pressure plate and the base. Due to the use of electromagnetic force clamping, the pressure plate can be made into a variety of workpiece requirements, and can process workpieces with side walls, and the operation is also very simple.

[0003] The hydraulic bending machine includes a bracket, a workbench and a clamping plate. The workbench is placed on the bracket. The workbench consists of a base and a clamping plate. The base is connected to the clamping plate through a hinge. The base consists of a base shell, a coil and a cover plate. The coil is placed in the depression of the base shell, and the top of the depression is covered with a cover plate. When in use, the coil is energized by a wire, and after energization, an attractive force is generated on the clamping plate, thereby clamping the thin plate between the clamping plate and the base. Due to the use of electromagnetic force clamping, the clamping plate can be made into a variety of workpiece requirements, and workpieces with side walls can be processed. The bending machine can meet the needs of various workpieces by replacing the bending machine mold.

[0004] At present, in the application based on pneumatic bending machine, air compressor is usually required as the energy source of brake braking, and the operation of various mechanical components is realized by air intake. In the process of air intake of pneumatic bending machine through air compressor, large noise will be generated. Although noise reduction can be achieved by covering the outer wall of the air intake component with sound insulation material, the noise reduction effect is not ideal as the bending machine continues to process for a long time. As the air circulates, the air intake component will shake and still generate internal and external noise, which will reduce the stability of the air intake component and affect the normal processing of the bending machine, and cannot provide a good working environment for the staff. Therefore, an air intake noise reduction device and a noise reduction method for a pneumatic bending machine are needed to solve the above problems. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides an air intake noise reduction device and a noise reduction method for a pneumatic bending machine, which solves the problem that noise reduction is achieved by coating the outer wall of the air intake component with sound insulation material, but the noise reduction effect is not ideal as the bending machine continues to process for a long time. As the air circulation causes the air intake component to shake, internal and external noises will still be generated, reducing the stability of the air intake component and thus affecting the normal processing of the bending machine, and failing to provide a good working environment for the staff.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an air intake noise reduction device for a pneumatic bending machine, comprising an air intake pipe, the upper surface and the lower surface of the air intake pipe are both provided with connecting flanges, the inner wall of the air intake pipe is provided with an inner layer, a noise reduction component is provided in the inner layer, the bottom of the noise reduction component is fixedly connected to the top of the limit component, the bottom end of the limit component is fixedly connected to the upper surface of the air permeable plate, and the air permeable plate is provided on the inner wall of the inner layer.

[0009] The left and right sides of the outer wall of the air intake pipe are connected with connecting pipes, the air permeable plate is located below the two connecting pipes, the ends of the two connecting pipes that are away from each other are threadedly connected to the lower surface of the muffler chamber through threaded sleeves, the muffler chamber is sleeved in the ring, and the ends of the two rings that are close to each other are fixedly connected to the left and right side surfaces of the air intake pipe respectively.

[0010] As a further solution of the present invention: a vacuum cavity is provided on the side wall of the air intake pipe, and sound insulation cotton is provided in the vacuum cavity.

[0011] As a further solution of the present invention: the noise reduction component includes two connecting baffles, the two connecting baffles are respectively clamped on the inner wall of the inner layer, the same connecting tube is clamped in the two connecting baffles, the lower surface of the connecting tube is fixedly connected to the upper surface of the air guide ring, the lower surface of the air guide ring is fixedly connected to the top of the limit assembly, and the outer wall of the connecting baffle is fixedly connected with support assemblies all around.

[0012] As a further solution of the present invention: the support assembly includes a slider, one side of which is fixedly connected to the outer wall of the connecting baffle, the slider is slidably connected in a slide groove, the slide groove is opened on the inner wall of the inner layer, the lower surface of the slider is fixedly connected to the top of the first spring, and the bottom end of the first spring is fixedly connected to the lower surface of the inner wall of the slide groove.

[0013] As a further solution of the present invention: the limiting assembly includes a sleeve, the bottom end of the sleeve is fixedly connected to the upper surface of the air-permeable plate, a sliding rod is sleeved in the sleeve, the bottom end of the sliding rod is fixedly connected to the lower surface of the inner wall of the sleeve through a second spring, the top end of the sliding rod is fixedly connected to the lower surface of the air guide ring, and the air guide ring is hemispherical in design.

[0014] As a further solution of the present invention: a plurality of first air holes and second air holes are respectively formed on the upper surface of the connecting baffle and the outer wall of the connecting tube, and the air permeable plate is of conical design.

[0015] As a further solution of the present invention: a cover plate is arranged on the top of the silencing chamber, a ventilation plate is clamped on the bottom of the silencing chamber, and a plurality of sound-absorbing balls are arranged above the ventilation plate.

[0016] A method for reducing air intake noise of a pneumatic bending machine comprises the following steps:

[0017] S1. First, install the gas output end to the top of the air inlet pipe through the upper connecting flange, connect the lower connecting flange to the input end of the pneumatic bending machine, control the external air compressor to work, and allow the gas to enter the air inlet pipe.

[0018] S2. When the gas enters the air intake pipe, the connecting baffle and the connecting tube divert the gas. The gas can pass through the first air hole on the connecting baffle and the second air hole on the connecting tube. Since the connecting tube is arranged on the two baffles, the air flow can pass through the upper first air hole, the second air hole and the lower first air hole in sequence, thereby changing the direction of gas movement and reducing the noise of the air intake pipe.

[0019] S3. When the airflow enters the air intake pipe, since a hemispherical air guide ring is provided at the bottom of the connecting tube, through the mutual cooperation between the first air hole and the second air hole, the change of impedance caused by the air intake at the air intake pipe interface during the sound propagation process produces reflection and interference of sound energy, thereby reducing the sound energy radiated outward from the air intake pipe and performing silencing.

[0020] S4. After the airflow is introduced into the connecting baffle and the connecting tube, the pressure of the airflow causes the connecting baffle to respectively drive the multiple sliders to move downward and squeeze the first spring, so that the noise reduction component can swing up and down slightly to avoid damage to the noise reduction component caused by the impact of the high-pressure airflow. At the same time, the air guide ring squeezes the slide rod to improve the movement stability of the noise reduction component.

[0021] S5. When the gas is discharged through the noise reduction component, it can pass through the conical air permeable plate. Some impurities will flow into the silencing chamber along the connecting pipe to prevent impurities from entering the air inlet and output ends of the pneumatic bending machine and affecting the normal operation of the device. The silencing chamber is equipped with sound-absorbing balls and ventilation plates, so that the air flow can be introduced into the silencing chamber and the noise is reduced by the sound-absorbing balls. The impurities in the silencing chamber can be cleaned by opening the cover plate, and the silencing chamber can be rotated to remove it from the connecting pipe.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. In the present invention, a connecting baffle, a connecting tube, an air guide ring, a muffler chamber, a vent plate, a first through hole and a second through hole are provided, and the connecting baffle and the connecting tube divert gas, and the gas can pass through the first air hole on the connecting baffle and the second air hole on the connecting tube. Since the connecting tube is provided on the two baffles, the airflow can pass through the upper first air hole, the second air hole and the lower first air hole in sequence, change the direction of gas movement, and reduce the noise of the intake pipe. When the airflow enters the intake pipe, since a hemispherical air guide ring is provided at the bottom of the connecting tube, through the mutual cooperation between the first air hole and the second air hole, through the air intake at the interface of the intake pipe, the change of impedance caused in the sound propagation process generates reflection and interference of sound energy, reduces the sound energy radiated outward from the intake pipe, and further improves its noise reduction effect. Due to the provision of the two muffler chambers, the airflow can be introduced into the muffler chamber and the noise is reduced by the sound-absorbing ball. The multi-stage noise reduction method is beneficial to the processing of the bending machine and further optimizes the working environment.

[0025] 2. In the present invention, by arranging a connecting baffle, a connecting tube, a sliding rod, a sleeve, a first spring, a second spring and a slider, the connecting baffle drives the multiple sliders to move downward and squeeze the first spring through the pressure of the airflow, so that the noise reduction component can swing up and down slightly to avoid damage to the noise reduction component caused by the impact of the high-pressure airflow. At the same time, the air guide ring squeezes the sliding rod and the second spring, and the working stability of the noise reduction component is further improved through the interaction between the first spring and the second spring.

[0026] 3. In the present invention, by arranging a vacuum chamber, a threaded sleeve, a cover plate and a silencer chamber, the gas can pass through the conical air permeable plate when discharged through the noise reduction component, and some impurities will flow into the silencer chamber along the connecting pipe, thereby preventing impurities from entering the air inlet and output ends of the pneumatic bending machine and affecting the normal operation of the device. The cover plate can be opened to clean the impurities in the silencer chamber, and the silencer chamber can be rotated to remove it from the connecting pipe, which is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of a three-dimensional cross-sectional structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the three-dimensional cross-sectional structure of the air intake pipe of the present invention;

[0029] Figure 3 It is a schematic diagram of the three-dimensional cross-sectional structure of the anechoic chamber of the present invention;

[0030] Figure 4 It is a three-dimensional structural schematic diagram of the noise reduction component of the present invention;

[0031] Figure 5It is a three-dimensional structural schematic diagram of the air-permeable plate of the present invention;

[0032] Figure 6 It is a schematic diagram of the structure enlarged at A of the present invention;

[0033] In the figure: 1. Inlet pipe; 2. Connecting flange; 3. Inner layer; 4. Noise reduction component; 41. Connecting baffle; 42. Connecting tube; 43. Air guide ring; 5. Support component; 51. Slider; 52. First spring; 6. Vacuum chamber; 7. Sound insulation cotton; 8. Breathable plate; 9. Limiting component; 91. Sliding rod; 92. Sleeve; 93. Second spring; 10. Ring; 11. Silencing chamber; 12. Connecting pipe; 13. Threaded sleeve; 14. Ventilation plate; 15. Sound-absorbing ball; 16. Cover plate; 17. First air hole; 18. Second air hole; 19. Slide groove. DETAILED DESCRIPTION

[0034] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0035] like Figure 1-6 As shown, the present invention provides a technical solution: an air intake noise reduction device for a pneumatic bending machine, comprising an air intake pipe 1, the upper surface and the lower surface of the air intake pipe 1 are both provided with connecting flanges 2, the inner wall of the air intake pipe 1 is provided with an inner layer 3, a noise reduction component 4 is provided in the inner layer 3, the bottom of the noise reduction component 4 is fixedly connected to the top of the limiting component 9, the bottom end of the limiting component 9 is fixedly connected to the upper surface of the air permeable plate 8, and the air permeable plate 8 is provided on the inner wall of the inner layer 3.

[0036] The left and right sides of the outer wall of the air intake pipe 1 are connected with connecting pipes 12, and the air permeable plate 8 is located below the two connecting pipes 12. The ends of the two connecting pipes 12 that are away from each other are threadedly connected to the lower surface of the silencing chamber 11 through a threaded sleeve 13. The silencing chamber 11 is sleeved in the ring 10. Through the mutual cooperation between the connecting pipe 12 and the silencing chamber 11, the gas can pass through the conical air permeable plate 8 when it is discharged through the noise reduction component 4. Some impurities will flow into the silencing chamber 11 along the connecting pipe 12, preventing impurities from entering the air intake and output ends of the pneumatic bending machine and affecting the normal operation of the device. The ends of the two rings 10 that are close to each other are fixedly connected to the left and right sides of the air intake pipe 1 respectively.

[0037] Specifically, Figure 1 , Figure 4 and Figure 6As shown, the side wall of the air intake pipe 1 is provided with a vacuum cavity 6, and the vacuum cavity 6 is provided with sound insulation cotton 7. The noise reduction component 4 includes two connecting baffles 41. By setting the noise reduction component 4, through the mutual cooperation between the first air hole 17 and the second air hole 18, through the air intake at the interface of the air intake pipe 1, the change of impedance caused in the sound propagation process generates reflection and interference of sound energy, reduces the sound energy radiated outward from the air intake pipe 1, thereby further improving its noise reduction effect. The two connecting baffles 41 are respectively clamped on the inner wall of the inner layer 3, and the same connecting tube 42 is clamped in the two connecting baffles 41. The lower surface of the connecting tube 42 is fixedly connected to the upper surface of the air guide ring 43, and the lower surface of the air guide ring 43 is fixedly connected to the top of the limit assembly 9. The outer wall of the plate 41 is fixedly connected with a support assembly 5 on all sides, and the support assembly 5 includes a slider 51, one side of the slider 51 is fixedly connected to the outer wall of the connecting baffle 41, the slider 51 is slidably connected in the slide groove 19, and the slide groove 19 is opened on the inner wall of the inner layer 3. The lower surface of the slider 51 is fixedly connected to the top of the first spring 52, and the mutual cooperation between the first spring 52 and the second spring 93 and the pressure of the airflow make the noise reduction assembly 4 can swing up and down slightly to avoid damage to the noise reduction assembly 4 caused by the impact of the high-pressure airflow. At the same time, the air guide ring 43 squeezes the slide rod 91 and the second spring 93 to further improve the working stability of the noise reduction assembly 4, and the bottom end of the first spring 52 is fixedly connected to the lower surface of the inner wall of the slide groove 19.

[0038] Specifically, Figure 1 , Figure 2 and Figure 5 As shown, the limiting assembly 9 includes a sleeve 92, the bottom end of the sleeve 92 is fixedly connected to the upper surface of the air permeable plate 8, a sliding rod 91 is sleeved in the sleeve 92, the bottom end of the sliding rod 91 is fixedly connected to the lower surface of the inner wall of the sleeve 92 through a second spring 93, and the top of the sliding rod 91 is fixedly connected to the lower surface of the air guide ring 43. The air guide ring 43 is hemispherical in design, and a plurality of first air holes 17 and second air holes 18 are respectively provided on the upper surface of the connecting baffle 41 and the outer wall of the connecting tube 42. The air permeable plate 8 is conical in design, and a cover plate 16 is provided on the top of the soundproof chamber 11. By providing the cover plate 16, the cover plate 16 can be opened to clean the impurities in the soundproof chamber 11, and the soundproof chamber 11 can be rotated to remove it from the connecting pipe 12, which is very convenient. A ventilation plate 14 is clamped at the bottom of the soundproof chamber 11, and a plurality of sound-absorbing balls 15 are provided above the ventilation plate 14.

[0039] A method for reducing air intake noise of a pneumatic bending machine comprises the following steps:

[0040] S1. First, install the gas output end to the top of the air inlet pipe 1 through the upper connecting flange 2, connect the lower connecting flange 2 to the input end of the pneumatic bending machine, control the external air compressor to work, and allow the gas to enter the air inlet pipe 1.

[0041] S2. When the gas enters the air intake pipe 1, the connecting baffle 41 and the connecting tube 42 are used to divert the gas. The gas can pass through the first air hole 17 on the connecting baffle 41 and the second air hole 18 on the connecting tube 42. Since the connecting tube 42 is arranged on two baffles, the air flow can pass through the upper first air hole 17, the second air hole 18 and the lower first air hole 17 in sequence, thereby changing the direction of gas movement and reducing the noise of the air intake pipe 1.

[0042] S3. When the airflow enters the air intake pipe 1, since a hemispherical air guide ring 43 is provided at the bottom of the connecting tube 42, through the mutual cooperation between the first air hole 17 and the second air hole 18, the change of impedance caused by the air intake at the interface of the air intake pipe 1 during the sound propagation process produces reflection and interference of sound energy, thereby reducing the sound energy radiated outward from the air intake pipe 1 and performing silencing.

[0043] S4. After the airflow is introduced into the connecting baffle 41 and the connecting tube 42, the pressure of the airflow causes the connecting baffle 41 to drive the multiple sliders 51 to move downward and squeeze the first spring 52, so that the noise reduction component 4 can swing up and down slightly to avoid damage to the noise reduction component 4 caused by the impact of the high-pressure airflow. At the same time, the air guide ring 43 squeezes the slide rod 91 to improve the movement stability of the noise reduction component 4.

[0044] S5. When the gas is discharged through the noise reduction component 4, it can pass through the conical air permeable plate 8. Some impurities will flow into the silencing chamber 11 along the connecting pipe 12 to prevent impurities from entering the air inlet and output ends of the pneumatic bending machine and affecting the normal operation of the device. The silencing chamber 11 is provided with a sound-absorbing ball 15 and a ventilation plate 14, so that the airflow can be introduced into the silencing chamber 11 and the noise is reduced by the sound-absorbing ball 15. The impurities in the silencing chamber 11 can be cleaned by opening the cover plate 16, and the silencing chamber 11 can also be rotated to remove it from the connecting pipe 12.

[0045] In summary:

[0046] By setting the connecting baffle 41, the connecting tube 42, the air guide ring 43, the muffler chamber 11, the vent plate 14, the first through hole and the second through hole, the connecting baffle 41 and the connecting tube 42 can divert the gas, and the gas can pass through the first air hole 17 on the connecting baffle 41 and the second air hole 18 on the connecting tube 42. Since the connecting tube 42 is arranged on two baffles, the air flow can pass through the upper first air hole 17, the second air hole 18 and the lower first air hole 17 in sequence, changing the direction of gas movement, and reducing the noise of the intake pipe 1. When the air flow enters the intake pipe 1, due to A hemispherical air guide ring 43 is provided at the bottom of the connecting tube 42. Through the mutual cooperation between the first air hole 17 and the second air hole 18, the impedance change caused in the sound propagation process through the air intake at the interface of the air intake pipe 1 produces reflection and interference of sound energy, reduces the sound energy radiated outward from the air intake pipe 1, thereby further improving its noise reduction effect. Due to the setting of the two sound-absorbing chambers 11, the airflow can be introduced into the sound-absorbing chamber 11 and the noise is reduced by the sound-absorbing ball 15. The multi-stage noise reduction method is beneficial to the processing of the bending machine and further optimizes the working environment.

[0047] By setting a connecting baffle 41, a connecting tube 42, a sliding rod 91, a sleeve 92, a first spring 52, a second spring 93 and a slider 51, the pressure of the airflow allows the connecting baffle 41 to drive the multiple sliders 51 to move downward and squeeze the first spring 52, so that the noise reduction component 4 can swing up and down slightly to avoid damage to the noise reduction component 4 caused by the impact of high-pressure airflow. At the same time, the air guide ring 43 squeezes the sliding rod 91 and the second spring 93. Through the interaction between the first spring 52 and the second spring 93, the working stability of the noise reduction component 4 is further improved.

[0048] By arranging the vacuum chamber 6, the threaded sleeve 13, the cover plate 16 and the silencing chamber 11, the gas can pass through the conical air permeable plate 8 when being discharged through the noise reduction component 4, and some impurities will flow into the silencing chamber 11 along the connecting pipe 12. The gas can pass through the conical air permeable plate 8 when being discharged through the noise reduction component 4, and some impurities will flow into the silencing chamber 11 along the connecting pipe 12, thereby preventing impurities from entering the air intake and output ends of the pneumatic bending machine and affecting the normal operation of the device. The cover plate 16 can be opened to clean the impurities in the silencing chamber 11, and the silencing chamber 11 can be rotated to remove it from the connecting pipe 12, which is very convenient.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0050] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. An air intake noise reduction device for a pneumatic bending machine, comprising an air intake pipe (1), characterized in that: The upper surface and the lower surface of the air intake pipe (1) are both provided with a connecting flange (2), the inner wall of the air intake pipe (1) is provided with an inner layer (3), a noise reduction component (4) is provided in the inner layer (3), the bottom of the noise reduction component (4) is fixedly connected to the top of the limit component (9), the bottom end of the limit component (9) is fixedly connected to the upper surface of the air permeable plate (8), and the air permeable plate (8) is provided on the inner wall of the inner layer (3); The left and right sides of the outer wall of the air intake pipe (1) are both connected with connecting pipes (12), the air permeable plate (8) is located below the two connecting pipes (12), the ends of the two connecting pipes (12) that are away from each other are threadedly connected to the lower surface of the muffler chamber (11) through threaded sleeves (13), the muffler chamber (11) is sleeved in the collar (10), and the ends of the two collars (10) that are close to each other are fixedly connected to the left and right side surfaces of the air intake pipe (1) respectively; The noise reduction component (4) comprises two connecting baffles (41), the two connecting baffles (41) are respectively clamped on the inner wall of the inner layer (3), the two connecting baffles (41) are clamped with the same connecting tube (42), the lower surface of the connecting tube (42) is fixedly connected to the upper surface of the air guide ring (43), the lower surface of the air guide ring (43) is fixedly connected to the top of the limit assembly (9), and the outer wall of the connecting baffle (41) is fixedly connected to the supporting assembly (5) on all sides; The limiting assembly (9) comprises a sleeve (92), the bottom end of the sleeve (92) is fixedly connected to the upper surface of the air permeable plate (8), a sliding rod (91) is sleeved inside the sleeve (92), the bottom end of the sliding rod (91) is fixedly connected to the lower surface of the inner wall of the sleeve (92) via a second spring (93), the top end of the sliding rod (91) is fixedly connected to the lower surface of the air guide ring (43), and the air guide ring (43) is of hemispherical design; The upper surface of the connecting baffle (41) and the outer wall of the connecting tube (42) are respectively provided with a plurality of first air holes (17) and a plurality of second air holes (18); the air permeable plate (8) is of conical design; a cover plate (16) is provided on the top of the muffler chamber (11); a ventilation plate (14) is clamped on the bottom of the muffler chamber (11); and a plurality of sound-absorbing balls (15) are provided above the ventilation plate (14).

2. The air intake noise reduction device for a pneumatic bending machine according to claim 1, characterized in that: A vacuum cavity (6) is provided on the side wall of the air inlet pipe (1), and sound insulation cotton (7) is provided in the vacuum cavity (6).

3. The air intake noise reduction device for a pneumatic bending machine according to claim 2, characterized in that: The support assembly (5) comprises a slider (51), one side of which is fixedly connected to the outer wall of the connecting baffle (41), the slider (51) is slidably connected in a slide groove (19), the slide groove (19) is opened on the inner wall of the inner layer (3), the lower surface of the slider (51) is fixedly connected to the top end of the first spring (52), and the bottom end of the first spring (52) is fixedly connected to the lower surface of the inner wall of the slide groove (19).

4. A noise reduction method for an air intake noise reduction device for a pneumatic bending machine according to any one of claim 3, characterized in that: The following steps are involved: S1. First, install the gas output end to the top of the air inlet pipe (1) through the upper connecting flange (2), connect the lower connecting flange (2) to the input end of the pneumatic bending machine, and control the external air compressor to operate so that the gas enters the air inlet pipe (1); S2. When the gas enters the air intake pipe (1), the connecting baffle (41) and the connecting tube (42) are used to divert the gas, and the gas can pass through the first air hole (17) on the connecting baffle (41) and the second air hole (18) on the connecting tube (42). Since the connecting tube (42) is arranged on the two baffles, the air flow can pass through the upper first air hole (17), the second air hole (18) and the lower first air hole (17) in sequence, thereby changing the direction of gas movement and reducing the noise of the air intake pipe (1); S3. When the airflow enters the air intake pipe (1), since the bottom of the connecting tube (42) is provided with a hemispherical air guide ring (43), the first air hole (17) and the second air hole (18) cooperate with each other, and the impedance change caused by the air intake at the interface of the air intake pipe (1) during the sound propagation process generates reflection and interference of sound energy, thereby reducing the sound energy radiated outward from the air intake pipe (1) and performing noise elimination; S4. After the airflow is introduced into the connecting baffle (41) and the connecting tube (42), the pressure of the airflow causes the connecting baffle (41) to respectively drive the plurality of sliders (51) to move downward and squeeze the first spring (52), so that the noise reduction component (4) can slightly swing up and down, thereby preventing the noise reduction component (4) from being damaged by the impact of the high-pressure airflow. At the same time, the air guide ring (43) squeezes the slide rod (91), thereby improving the movement stability of the noise reduction component (4); S5. When the gas is discharged through the noise reduction component (4), it can pass through the conical air permeable plate (8), and some impurities will flow into the silencing chamber (11) along the connecting pipe (12), so as to prevent the impurities from entering the air inlet and outlet ends of the pneumatic bending machine and affecting the normal operation of the device. The silencing chamber (11) is provided with a sound-absorbing ball (15) and a vent plate (14), so that the air flow can be introduced into the silencing chamber (11) and the noise is reduced by the sound-absorbing ball (15). The impurities in the silencing chamber (11) can be cleaned by opening the cover plate (16), and the silencing chamber (11) can also be rotated to remove it from the connecting pipe (12).

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