Chute noise reduction device

Abstract

This invention relates to the field of chute noise reduction technology and discloses a chute noise reduction device. This device is a noise reduction mechanism disposed outside the chute body and coaxial with it. The noise reduction mechanism includes multiple vibration damping modules spaced apart on the chute body in the longitudinal direction and sound-absorbing and insulating modules extending in the longitudinal direction and connected to the vibration damping modules. Through this technical solution, by setting the noise reduction mechanism outside the chute body and comprising multiple vibration damping modules connected to the chute body and sound-absorbing and insulating modules connected to the vibration damping modules, the noise reduction mechanism simultaneously reduces noise from both vibration suppression and sound absorption and insulation aspects, thus greatly improving the noise reduction effect of the chute device.

Description

Technical Field

[0001] This invention relates to the field of chute noise reduction technology, and more specifically to a chute noise reduction device. Background Technology

[0002] A chute is a smooth-surfaced channel on the ground that transports materials from a higher to a lower level, allowing the material to slide down automatically. Chutes are one of the main pieces of equipment in coal preparation plants, playing a role in distributing, concentrating, equalizing, and regulating the process flow. Chute noise is one of the main noise sources in the coal washing workshop, with operating noise levels reaching 114 dB(A). The noise spectrum is wide-bandgap, with prominent low-to-mid frequencies (200-500 Hz) and mid-to-high frequencies (1000-4000 Hz), making noise control challenging.

[0003] The noise of the chute mainly consists of three parts: first, the impact sound generated by coal or gangue hitting the bottom steel plate of the chute inlet; second, the noise generated by coal or gangue colliding with each other and with the chute wall; and third, the vibration noise generated by the chute after being impacted.

[0004] Workers exposed to high noise levels for extended periods will experience reduced work efficiency and hearing loss, potentially leading to deafness. Noise also negatively impacts workers' mental health and activity levels, causing annoyance, irritability, and fatigue. Intermittent noise has a greater impact on the human body than continuous noise. Since the noise generated by materials impacting the chute is mostly intermittent, its harmful effects on workers are particularly pronounced.

[0005] Currently, there is a lack of effective technologies for controlling chute noise. The commonly used technical measures are mainly as follows: First, attaching high-damping, wear-resistant, and impact-resistant materials (mainly rubber sheets and ultra-high molecular weight polyethylene sheets) inside the chute. However, the problem with this measure is that rubber sheets are prone to clogging the chute, while ultra-high molecular weight polyethylene sheets are relatively expensive. Second, attaching high internal resistance materials (commonly used high internal resistance materials include asbestos wool and slag wool) to the outer surface of the chute and using adhesives such as asphalt and epoxy resin. However, this measure has limited effect on suppressing chute vibration, has poor noise reduction effect, and is not conducive to chute maintenance and replacement. Third, using wear-resistant rubber sheets to make the chute. However, this measure cannot effectively reduce the noise from the collision of coal blocks or gangue. In addition, it is expensive, has a short service life, and is prone to aging and damage. Therefore, this measure is rarely used. Summary of the Invention

[0006] The main technical problem solved by this invention is that the existing technology does not achieve ideal noise reduction for chute devices.

[0007] To achieve the above objectives, the present invention provides a chute noise reduction device, which is a noise reduction mechanism disposed outside the chute body and coaxial with the chute body. The noise reduction mechanism includes a plurality of vibration damping modules spaced apart on the chute body in the longitudinal direction and a sound absorption and insulation module extending in the longitudinal direction and connected to the vibration damping modules.

[0008] In some embodiments, the vibration damping module includes a vibration damping bracket disposed on the chute body and a vibration damper disposed on the vibration damping bracket.

[0009] In some embodiments, the vibration damping bracket includes a first vibration damping bracket perpendicular to the side wall of the chute body and a second vibration damping bracket parallel to the side wall of the chute body. The first vibration damping bracket and the second vibration damping bracket are fixedly connected, and the vibration damper is connected to the second vibration damping bracket by bolts.

[0010] In some embodiments, the sound-absorbing and sound-insulating module includes a first sound-absorbing panel, a second sound-insulating panel, and sound-absorbing cotton disposed between the first sound-absorbing panel and the second sound-insulating panel.

[0011] In some embodiments, the first sound-absorbing plate is located close to the vibration damping module, and the first sound-absorbing plate and the vibration damping bracket are supported by the sound-absorbing bracket and connected by the bolts.

[0012] In some embodiments, the chute body has a quadrilateral cross section, the sound absorption and insulation module includes four corner portions corresponding to the four corners of the chute body, the four corner portions of the sound absorption and insulation module are connected end to end to surround the chute body, and the four corner portions of the sound absorption and insulation module are detachably mounted on the vibration damping module.

[0013] In some embodiments, the sound-absorbing and insulating module is provided with connectors at its four corners, and two adjacent corners are connected by the connectors and bolts.

[0014] In some embodiments, a sealing strip extending along the longitudinal direction is provided between two adjacent corners.

[0015] In some embodiments, the area between the chute body and the second vibration damping bracket is configured as a first air cavity, and the area between the second vibration damping bracket and the first sound-absorbing plate is configured as a second air cavity.

[0016] In some embodiments, the first sound-absorbing plate is a perforated plate.

[0017] By using the above technical solution, a noise reduction mechanism is set on the outside of the chute body, and the noise reduction mechanism is set up as two parts: multiple vibration damping modules connected to the chute body and sound absorption and insulation modules connected to the vibration damping modules. This allows the noise reduction mechanism to reduce noise from both the aspects of suppressing vibration and absorbing and isolating noise, which can greatly improve the noise reduction effect of the chute device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the chute noise reduction device disclosed in an embodiment of the present invention;

[0020] Figure 2 This is a longitudinal cross-sectional view of the chute noise reduction device disclosed in an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures

[0022] 100. Chute body; 200. Noise reduction mechanism; 300. Vibration damping module; 301. First vibration damping bracket; 302. Second vibration damping bracket; 303. Vibration damper; 400. Sound absorption and insulation module; 401. Sound absorption bracket; 402. First sound absorption board; 403. Sound absorption cotton; 404. Second sound insulation board; 405. Sealing strip; 406. Connector; 500. Bolt. Detailed Implementation

[0023] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0024] These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0025] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] Furthermore, the terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible range of error. "Parallel" is not strictly parallel, but within the permissible range of error. Terms such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0027] It should also be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0028] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0030] To address the problem of unsatisfactory noise reduction performance in existing chute devices, this invention provides a chute noise reduction device, such as... Figure 1As shown, in one specific embodiment, the chute noise reduction device is a noise reduction mechanism 200 disposed outside the chute body 100 and coaxial with the chute body 100. The noise reduction mechanism 200 includes a plurality of vibration damping modules 300 spaced apart on the chute body 100 in the longitudinal direction and a sound absorption and insulation module 400 extending in the longitudinal direction and connected to the vibration damping modules 300.

[0031] Among them, such as Figure 1 and Figure 2 As shown, the chute body 100 can be a square pipe, and the noise reduction mechanism 200 can be mounted on the outer wall of the chute body 100 so that the chute body 100 can be completely accommodated in the noise reduction mechanism 200; each side wall of the chute body 100 is provided with a vibration damping module 300, and multiple vibration damping modules 300 can be equally spaced in the longitudinal direction, for example, spaced 500mm to 1000mm apart in the longitudinal direction, and the longitudinal direction can be the same as the longitudinal direction of the chute body 100; the sound absorption and insulation module 400 is supported on the outer periphery of the chute body 100 by multiple vibration damping modules 300, and the sound absorption and insulation module 400 can be a square pipe coaxial with the chute body 100.

[0032] By using the above technical solution, a noise reduction mechanism 200 is set on the outside of the chute body 100, and the noise reduction mechanism 200 is set as two parts: multiple vibration damping modules 300 connected to the chute body 100 and a sound absorption and insulation module 400 connected to the vibration damping modules 300. This allows the noise reduction mechanism 200 to reduce noise from both the aspects of suppressing vibration and absorbing and isolating noise, which can greatly improve the noise reduction effect of the chute device.

[0033] In some embodiments, the vibration damping module 300 includes a vibration damping bracket disposed on the chute body 100 and a vibration damper 303 disposed on the vibration damping bracket.

[0034] The impact of coal or gangue against the side walls of the chute body 100, as well as the collision of coal or gangue with each other, will cause the chute body 100 to vibrate strongly. Figure 1 As shown, the vibration is transmitted outward through the vibration damping bracket of the vibration damping module 300 to the vibration damper 303 of the vibration damping module 300. The vibration damper 303 can be a block-type particle vibration damper. Through the inelastic collision and friction of the particles inside the vibration damper 303, the vibration energy is consumed, thereby effectively suppressing the vibration and reducing the transmission of the chute vibration outward. The vibration damper 303 can be mainly composed of a steel plate box with a thickness of not less than 3mm and iron particles.

[0035] In some embodiments, the vibration damping bracket includes a first vibration damping bracket 301 perpendicular to the side wall of the chute body 100 and a second vibration damping bracket 302 parallel to the side wall of the chute body 100. The first vibration damping bracket 301 and the second vibration damping bracket 302 are fixedly connected, and the vibration damper 303 is connected to the second vibration damping bracket 302 by bolts 500.

[0036] like Figure 1 As shown, the first vibration damping bracket 301 and the second vibration damping bracket 302 can be used to support the vibration damper 303 and transmit vibration outward. When the chute vibration is transmitted, it is first transmitted from the side wall of the chute body 100 to the first vibration damping bracket 301, then to the second vibration damping bracket 302, and finally to the vibration damper 303. The first vibration damping bracket 301 and the second vibration damping bracket 302 can be fixedly connected by welding. Bolts 500 can be installed at both ends of the vibration damper 303 to connect with the second vibration damping bracket 302. The first vibration damping bracket 301 can be a steel plate with a thickness of not less than 10mm, specifically, a 10mm×50mm×80mm steel plate can be selected. The second vibration damping bracket 302 can be a steel plate with a thickness of not less than 5mm, specifically, a 5mm×80mm flat steel plate can be selected.

[0037] In some embodiments, the sound absorption and insulation module 400 includes a first sound-absorbing plate 402, a second sound insulation plate 404, and sound-absorbing cotton 403 disposed between the first sound-absorbing plate 402 and the second sound-absorbing plate 404.

[0038] like Figure 1 As shown, after the noise is damped by the vibration damping module 300, it continues to be transmitted outward. First, it reaches the first sound-absorbing plate 402 of the sound-absorbing and sound-insulating module 400, and then it is transmitted to the sound-absorbing cotton 403. The noise propagates in the tiny gaps and continuous holes of the sound-absorbing cotton 403, causing the air inside the hole to vibrate and creating friction with the hole wall. Due to friction and viscosity, the sound energy is converted into heat energy, thus reducing the noise. Finally, after the isolation effect of the second sound insulation plate 404, the noise transmitted to the outside of the chute device is reduced to the greatest extent.

[0039] Among them, the first sound-absorbing board 402 can be a perforated aluminum alloy board with a thickness of not less than 0.8mm, the second sound insulation board 404 can be a galvanized steel plate with a thickness of not less than 1.2mm, the sound-absorbing cotton 403 can be 32K or 48K centrifugal glass wool, and the sound-absorbing cotton 403 can be wrapped with alkali-free water-repellent glass cloth.

[0040] In some embodiments, the first sound-absorbing plate 402 is located close to the vibration damping module 300, and the first sound-absorbing plate 402 is supported by the sound-absorbing bracket 401 and connected by bolts 500. For example... Figure 1As shown, the vibration damping module 300 and the sound absorption and insulation module 400 can be supported and fixed by multiple sound-absorbing brackets 401. The sound-absorbing brackets 401 are connected to the second vibration damping bracket 302 by bolts 500. The sound-absorbing brackets 401 can be C-shaped or U-shaped frames and are made of steel plates with a thickness of not less than 1.5mm.

[0041] In some embodiments, the chute body 100 has a quadrilateral cross-section, and the sound absorption and insulation module 400 includes four corner portions corresponding to the four corners of the chute body 100. The four corner portions of the sound absorption and insulation module 400 are connected end to end to surround the chute body 100, and the four corner portions of the sound absorption and insulation module 400 are detachably mounted on the vibration damping module 300. Figure 1 As shown, the sound-absorbing and insulating module 400 can enclose or wrap the chute body 100 by using the sound-absorbing bracket 401 as support and dividing the chute body 100 into four L-shaped corners that are equally divided by the quadrilateral cross-section of the chute body 100. This detachable method allows for easy installation of the noise reduction mechanism 200 on the chute body 100 and facilitates the inspection, maintenance, and replacement of various components within the chute device. Furthermore, the installation of the sound-absorbing and insulating module 400 at the four corners does not affect the normal production operation of the chute, meaning it can be installed while the chute is running, ensuring continuous production.

[0042] In some embodiments, the sound-absorbing and insulating module 400 has connectors 406 at its four corners, and adjacent corners are connected by connectors 406 and bolts 500. For example... Figure 1 As shown, the connector 406 can be fixed to the second sound insulation plate 404 by welding or bonding. Specifically, a connector 406 can be fixed to the connection end of two adjacent corners and fixedly connected by bolts 500. The connector 406 can be made of angle steel with a side length of 40mm and a thickness of 5mm. The connection of the four corners of the sound absorption and insulation module 400 is achieved by the cooperation of the connector 406 and the bolts 500, which also facilitates disassembly and is beneficial for the inspection, maintenance and replacement of various components in the chute device.

[0043] In some embodiments, a sealing strip 405 extending longitudinally is provided between two adjacent corners. The sealing strip 405 prevents rigid contact between the four corners of the sound-absorbing and insulating component module 400, while ensuring the seal between the four corners, preventing noise from directly passing through the sound-absorbing and insulating layer and causing sound leakage. The sealing strip 405 can be made of 5mm thick EPDM or neoprene rubber. Figure 1 As shown, a sealing strip 405 is also provided between two adjacent connectors 406.

[0044] In some embodiments, the area between the chute body 100 and the second vibration damping bracket 302 is configured as a first air cavity, and the area between the second vibration damping bracket 302 and the first sound-absorbing plate 402 is configured as a second air cavity. For example... Figure 1 As shown, the noise radiated from the side wall of the chute body 100 first propagates to the first air cavity. Due to the vibration friction and viscous resistance of the air particles and the continuous reflection of the noise, the sound energy propagating to the first air cavity is converted into heat energy and lost, thereby reducing the noise of the chute. The propagation and noise reduction principle of noise in the second air cavity is the same.

[0045] In some embodiments, the first sound-absorbing plate 402 is a perforated plate. When noise passes through the holes in the perforated plate, it is reflected, thereby changing the propagation path of the sound wave and interfering with the propagation of the noise, thus further reducing the noise. Specifically, the first sound-absorbing plate 402 can be a perforated aluminum alloy plate with a thickness of not less than 0.8 mm.

[0046] The various embodiments of the present invention have now been described in detail. To avoid obscuring the concept of the invention, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

[0047] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. A chute noise reduction device, characterized by, The noise reduction device of the chute is a noise reduction mechanism (200) disposed outside the chute body (100) and coaxial with the chute body (100). The noise reduction mechanism (200) includes a plurality of vibration damping modules (300) spaced apart on the chute body (100) in the longitudinal direction and a sound absorption and insulation module (400) connected to the vibration damping modules (300) and extending in the longitudinal direction. The vibration damping module (300) includes a vibration damping bracket disposed on the chute body (100). The vibration damping bracket includes a first vibration damping bracket (301) perpendicular to the side wall of the chute body (100) and a second vibration damping bracket (302) parallel to the side wall of the chute body (100). The sound absorption and insulation module (400) includes a first sound-absorbing plate (402). The area between the chute body (100) and the second vibration damping bracket (302) is set as a first air cavity, and the area between the second vibration damping bracket (302) and the first sound-absorbing plate (402) is set as a second air cavity.

2. The chute noise reduction device of claim 1, wherein, The vibration damping module (300) includes a vibration damper (303) mounted on the vibration damping bracket.

3. The chute noise reduction device of claim 2, wherein, The first vibration damping bracket (301) is fixedly connected to the second vibration damping bracket (302), and the vibration damper (303) is connected to the second vibration damping bracket (302) by bolts (500).

4. The chute noise reduction device according to claim 2, characterized in that, The sound absorption and insulation module (400) includes a second sound insulation board (404) and sound-absorbing cotton (403) disposed between the first sound absorption board (402) and the second sound insulation board (404).

5. The chute noise reduction device of claim 4, wherein, The first sound-absorbing plate (402) is close to the vibration damping module (300), and the first sound-absorbing plate (402) and the vibration damping bracket are supported by the sound-absorbing bracket (401) and connected by bolts (500).

6. The chute noise reduction device of claim 3, wherein, The chute body (100) has a quadrilateral cross section, and the sound absorption and insulation module (400) includes four corner portions corresponding to the four corners of the chute body (100). The four corner portions of the sound absorption and insulation module (400) are connected end to end to surround the chute body (100), and the four corner portions of the sound absorption and insulation module (400) are detachably mounted on the vibration damping module (300).

7. The chute noise reduction device of claim 6, wherein, The sound-absorbing and insulating module (400) has connectors (406) at its four corners, and two adjacent corners are connected by the connectors (406) and the bolts (500).

8. The chute noise reduction device of claim 7, wherein, A sealing strip (405) extending along the longitudinal direction is provided between two adjacent corners.

9. The chute noise reduction device of claim 4, wherein, The first sound-absorbing plate (402) is a perforated plate.

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