A noise reduction and sound insulation cover structure for environmentally friendly and energy-saving mining powder processing equipment

Abstract

This utility model provides an environmentally friendly and energy-saving noise reduction and sound insulation cover structure for mining powder processing equipment, belonging to the technical field of mining processing equipment. The structure includes a cover body, a sound-absorbing layer, a damping plate, and a sealing strip. The cover body has a box-like structure, with a sound-absorbing layer attached to the inner wall. The damping plate is fixedly installed on the outer wall of the cover body, and the sealing strip is located at the bottom edge of the cover body. A sandwich space is formed between the inner and outer walls of the cover body. The thickness of the sound-absorbing layer decreases in a stepped manner along the height of the cover body. The damping plate is connected to the outer wall of the cover body through multiple fixing points. The contact surface between the sealing strip and the bottom edge of the cover body is wavy. This utility model can solve the problem of achieving ideal noise reduction in high-noise environments of mining powder processing equipment, which affects the quality of the mining working environment and the health of workers.

Description

Technical Field

[0001] This utility model belongs to the technical field of mining processing equipment, specifically, it relates to a noise reduction and sound insulation cover structure for environmentally friendly and energy-saving mining powder processing equipment. Background Technology

[0002] Mining powder processing equipment generates strong mechanical and aerodynamic noise during operation, typically reaching 85dB to 110dB. Prolonged exposure to this high-noise environment can cause permanent hearing damage to operators and also pollute the surrounding environment. Currently, mining companies commonly use noise-reducing soundproof enclosures to reduce noise radiation from powder processing equipment. Existing soundproof enclosures mainly consist of an enclosure body and sound-absorbing materials. The enclosure body is usually made of a single layer of steel or aluminum alloy plate, with sound-absorbing cotton or foam plastic attached to the inner wall as a sound-absorbing layer. This traditional structure has significant technical drawbacks in practical applications. The single-layer enclosure structure has limited sound wave blocking capabilities; sound waves easily transmit to the external environment through the enclosure wall via solid-borne sound transmission, especially with poor isolation of low-frequency noise. The sound-absorbing layer is directly attached to the inner wall of the enclosure, lacking an air layer, resulting in poor absorption of low-frequency sound waves. Furthermore, the uniform thickness of the sound-absorbing layer fails to effectively absorb sound waves of different frequencies, leading to persistently high noise levels in certain frequency bands. Existing soundproof enclosures typically use ordinary rubber strips for sealing at the connection between the enclosure and the equipment base. This results in poor sealing, allowing high-frequency noise to easily leak through the gaps, severely impacting the overall noise reduction effect. Furthermore, existing soundproof enclosures lack effective damping and vibration reduction measures. Vibrations generated during equipment operation are transmitted to the enclosure and radiate noise outwards, further reducing the noise reduction effect. These technical deficiencies make existing noise-reducing soundproof enclosures insufficient to meet the actual noise reduction requirements of mining powder processing equipment. Utility Model Content

[0003] In view of this, the present invention provides an environmentally friendly and energy-saving noise reduction and sound insulation cover structure for mining powder processing equipment, which can solve the problem that it is difficult to achieve the ideal noise reduction effect in the high noise environment of mining powder processing equipment, thus affecting the quality of the mining working environment and the health of workers.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment, including a cover body, a sound-absorbing layer, a damping plate, and a sealing strip; the cover body has a box structure, with a sound-absorbing layer attached to the inner wall surface of the cover body, the damping plate fixedly installed on the outer wall surface of the cover body, and the sealing strip set at the bottom edge of the cover body; wherein, a sandwich space is formed between the inner wall surface and the outer wall surface of the cover body, the thickness of the sound-absorbing layer decreases in a stepped manner along the height direction of the cover body, the damping plate is connected to the outer wall surface of the cover body through multiple fixing points, and the contact surface between the sealing strip and the bottom edge of the cover body is wavy.

[0006] The technical effects of the noise reduction and sound insulation cover structure for environmentally friendly and energy-saving mining powder processing equipment provided by this utility model are as follows: The sandwich space structure formed between the inner and outer walls of the cover increases the complexity of the sound wave propagation path, causing the sound waves to undergo multiple reflections and attenuations within the sandwich space, effectively reducing the sound energy transmission efficiency; the design of the sound-absorbing layer thickness decreasing in a stepped manner along the height direction of the cover allows sound waves of different frequencies to be absorbed at different height positions, improving the overall sound absorption effect; the damping plate is connected to the outer wall of the cover through multiple fixed points, reducing the transmission of vibration energy on the surface of the cover and reducing the vibration radiation noise of the cover itself; the contact surface between the sealing strip and the bottom edge of the cover has a wavy undulating structure, increasing the sealing contact area, improving sealing performance, and preventing sound waves from leaking from the bottom gaps, thereby achieving effective isolation and absorption of the operating noise of the mining powder processing equipment.

[0007] Based on the above technical solution, the noise reduction and sound insulation cover structure of the environmentally friendly and energy-saving mining powder processing equipment of this utility model can be further improved as follows:

[0008] The cover is assembled from multiple plates connected by bolts. The connection between adjacent plates is made by overlapping, with the overlap width being one-tenth to one-eighth of the width of a single plate.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the enclosure is a structure assembled from multiple plates connected by bolts, which facilitates the transportation, installation and maintenance of the enclosure. When a plate is damaged, only the single plate needs to be replaced instead of the entire enclosure. The connection between adjacent plates is made by overlapping, which increases the rigidity and strength of the connection and prevents deformation or breakage due to stress concentration. The overlap width is set to one-tenth to one-eighth of the width of a single plate, which ensures the firmness of the connection and avoids increasing material consumption and overall weight due to excessive overlap width. At the same time, the double-layer plate area formed by the overlap structure can further enhance the sound insulation effect of that part.

[0010] Furthermore, the surface of the sound-absorbing layer has multiple uniformly distributed through holes. The diameter of the through holes expands in a trumpet shape along the thickness direction of the sound-absorbing layer, and the spacing between the through holes is smaller than the maximum diameter of a single through hole.

[0011] The beneficial effects of the above-mentioned improvement scheme are as follows: Multiple uniformly distributed through-holes on the surface of the sound-absorbing layer increase the contact area between sound waves and the sound-absorbing layer, making it easier for sound waves to enter the interior of the sound-absorbing layer and be absorbed and converted into heat energy; the design of the through-hole diameter expanding in a trumpet shape along the thickness direction of the sound-absorbing layer forms a gradually varying impedance matching channel for sound waves, reducing sound wave reflection at the through-hole entrance and improving the efficiency of sound waves entering the sound-absorbing layer; the arrangement of the spacing between through-holes being smaller than the maximum diameter of a single through-hole ensures that the surface of the sound-absorbing layer has a sufficiently dense sound-absorbing channel, allowing sound waves of all frequency bands to find a suitable sound absorption path, thereby achieving effective absorption of broadband noise and significantly improving the noise reduction effect.

[0012] Furthermore, the damping plate has a corrugated structure, and the height difference between the crests and troughs of the corrugations is two to three times the overall thickness of the damping plate. The corrugations extend in a direction perpendicular to the height of the cover.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the corrugated plate structure of the damping plate significantly increases the surface area and structural stiffness of the damping plate. When vibration energy is transmitted to the damping plate, the corrugated structure can consume the vibration energy through its own elastic deformation. The height difference between the crest and trough is set to two to three times the overall thickness of the damping plate, so that the corrugated structure has a large deformation space and can effectively absorb vibrations of different amplitudes. The corrugation extension direction is arranged perpendicular to the height direction of the cover, so that the damping plate can better prevent the vibration from propagating along the height direction of the cover, confining the vibration energy to a local area and converting it into heat energy dissipation through the internal damping effect of the material, thereby effectively suppressing the resonance phenomenon of the cover and reducing the radiation of structural noise.

[0014] Furthermore, the sealing strip has a hollow rectangular cross-section, with the hollow portion accounting for one-third to one-half of the total cross-sectional area of ​​the sealing strip. The sealing strip is fixedly connected to the bottom edge of the cover by adhesive bonding.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the cross-section of the sealing strip is a hollow rectangular structure, which allows the sealing strip to generate greater elastic deformation when compressed, improving the sealing strip's adaptability to uneven surfaces; the design that the hollow part accounts for one-third to one-half of the total cross-sectional area of ​​the sealing strip ensures that the sealing strip has sufficient elasticity and flexibility, while avoiding the loss of sealing function due to insufficient strength caused by an excessively large hollow part; the sealing strip is fixedly connected to the bottom edge of the cover by adhesive bonding, forming a continuous sealing layer, which effectively blocks the gap between the bottom of the cover and the equipment base, preventing high-frequency noise from propagating outward through tiny gaps, and significantly improving the low-frequency and high-frequency noise reduction capabilities of the overall soundproof cover structure.

[0016] Furthermore, the top of the cover has an arched structure with a radius of curvature that is one-half to two-thirds of the width of the bottom of the cover, and an exhaust hole is provided at the center of the top of the cover.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The top of the enclosure has an arched structure, which causes the sound waves inside the enclosure to diffuse and reflect rather than reflect directionally when they reach the top, avoiding the formation of standing waves inside the enclosure and reducing the accumulation of sound energy inside the enclosure; the radius of curvature of the arched structure is set to one-half to two-thirds of the width of the bottom of the enclosure, which ensures that the arched structure has sufficient curvature to achieve effective sound wave diffusion, and avoids the increased material consumption caused by the excessive height of the enclosure due to the small radius of curvature; an exhaust hole is opened at the center of the top of the enclosure, which can discharge the heat and dust generated inside the enclosure due to the operation of the equipment, preventing the heat from accumulating and causing the internal temperature of the enclosure to be too high. At the same time, the setting of the exhaust hole will not significantly affect the sound insulation effect, because the sound waves have been greatly attenuated after multiple reflections by the arched structure.

[0018] Furthermore, a gap is provided between the sound-absorbing layer and the inner wall of the enclosure. The width of the gap is one-fifth to one-quarter of the thickness of the sound-absorbing layer. The sound-absorbing layer maintains a fixed distance from the inner wall of the enclosure through multiple support points.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: A gap is set between the sound-absorbing layer and the inner wall of the enclosure, forming a combined sound-absorbing structure of an air layer and a sound-absorbing layer. The air layer can absorb low-frequency sound waves, while the sound-absorbing layer can absorb mid-to-high-frequency sound waves. Together, they achieve effective absorption of noise across the entire frequency range. The gap width is set to one-fifth to one-quarter of the thickness of the sound-absorbing layer, ensuring that the air layer has sufficient thickness to produce a low-frequency sound absorption effect, while avoiding an increase in the overall size of the enclosure due to an excessively large gap. The sound-absorbing layer maintains a fixed distance from the inner wall of the enclosure through multiple support points, ensuring a uniform gap between the sound-absorbing layer and the inner wall of the enclosure, guaranteeing a balanced sound absorption effect at all locations. Simultaneously, the support points prevent the sound-absorbing layer from sagging and deforming under its own weight, thus losing its air layer structure.

[0020] Furthermore, the fixing points of the damping plate are distributed in a grid pattern on the outer wall of the cover, and the distance between adjacent fixing points is one-fifth to one-third of the side length of the damping plate.

[0021] The beneficial effects of the above-mentioned improved scheme are as follows: the damping plate fixing points are distributed in a grid pattern on the outer wall of the cover, so that multiple independent vibration isolation units are formed between the damping plate and the cover. When vibration occurs at a certain position, the vibration energy is only transmitted within that unit and is difficult to spread to the entire surface of the cover. The distance between adjacent fixing points is set to one-fifth to one-third of the side length of the damping plate, which ensures that each vibration isolation unit has an appropriate size to achieve effective vibration attenuation, and also ensures that there are enough fixing points to provide a stable fixing effect. The grid-like distribution of fixing points allows the damping plate to evenly distribute the impact energy to multiple fixing points when subjected to external impact, avoiding excessive force on a single point that could lead to failure of the connection between the damping plate and the cover, thus improving the reliability and durability of the overall structure.

[0022] Furthermore, the height of the crests of the wavy undulations of the sealing strip is greater than the depth of the troughs, and the horizontal distance between the crests and troughs is one-fifteenth to one-tenth of the total length of the sealing strip.

[0023] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the design of the wavy undulation of the sealing strip with the peak height greater than the trough depth ensures that when the sealing strip contacts the base, the peak part contacts first and generates greater compression deformation, forming the first sealing barrier, while the trough part acts as a buffer area to adapt to the small protrusions on the base surface; the horizontal distance between the peak and the trough is set to one-fifteenth to one-tenth of the total length of the sealing strip, so that the sealing strip has a sufficient number of peaks and troughs distributed circumferentially, forming multiple continuous sealing barriers, so that even if the seal fails at a certain point, a continuous leakage channel will not be formed; this wavy undulation structure can also maintain a good sealing effect when the cover undergoes slight displacement due to thermal expansion and contraction, avoiding sealing failure caused by changes in the size of the cover.

[0024] Furthermore, the interlayer space of the enclosure is filled with sound-insulating material, which remains in a non-contact state with both the inner and outer walls of the enclosure. The sound-insulating material is fixed in the middle of the interlayer space by suspension.

[0025] The beneficial effects of the above-mentioned improvement scheme are as follows: the sound insulation material is filled into the interlayer space of the enclosure and kept in a non-contact state with the inner and outer walls of the enclosure, avoiding the formation of a sound bridge between the sound insulation material and the enclosure, which would cause sound waves to be transmitted through solids, thus ensuring the sound insulation effect of the interlayer space; the sound insulation material is fixed in the middle of the interlayer space by suspension, so that a double-layer air sound insulation layer is formed around the sound insulation material. When the sound waves are transmitted from the inner wall to the outer wall, they need to pass through the air layer, the sound insulation material and the air layer in sequence. After multiple medium changes and energy conversions, the sound energy is fully attenuated; the suspension method also prevents the sound insulation material from being compacted and deformed due to its own weight, maintaining the loose state and good sound absorption performance of the sound insulation material. At the same time, the suspension structure itself can also absorb some vibration energy, further improving the overall noise reduction and sound insulation effect.

[0026] Compared with existing technologies, the beneficial effects of the noise reduction and sound insulation cover structure for environmentally friendly and energy-saving mining powder processing equipment provided by this utility model are as follows: By creating a sandwich space between the inner and outer walls of the cover and filling the sandwich with suspended sound insulation material, a multi-layered sound wave blocking and absorption system is constructed. This causes sound waves to undergo multiple medium conversions and energy attenuation during transmission, significantly reducing the transmission efficiency of sound waves. The design of the sound-absorbing layer thickness decreasing in a stepped manner along the height of the cover and the opening of horn-shaped expansion holes on the surface achieves targeted absorption of sound waves of different frequencies, broadens the noise reduction frequency range, and improves the absorption capacity for broadband noise. The damping plate adopts a corrugated plate structure and is connected to the cover through a grid-like fixing point, effectively suppressing the vibration transmission and resonance phenomenon of the cover and reducing structural radiated noise. The design of the sealing strip with a hollow rectangular cross-section and a wavy, undulating contact surface forms multiple sealing barriers, effectively blocking sound wave leakage channels and improving overall sealing performance. The arched structure design at the top of the cover prevents sound waves from forming standing waves inside the cover, reducing sound energy accumulation. The air layer structure between the sound-absorbing layer and the inner wall of the enclosure enhances the low-frequency sound absorption effect. Through the synergistic effect of the above-mentioned multiple technical features, this utility model achieves comprehensive isolation and absorption of operating noise from mining powder processing equipment. Compared with the prior art, it has significant technological advancements in noise reduction, wide applicable frequency range, stable and reliable structure, and convenient maintenance. It can effectively improve the mining working environment, protect workers' hearing health, and meet the requirements of environmental protection and energy conservation. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of a noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment;

[0029] Figure 2 A cross-sectional schematic diagram of a noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment;

[0030] Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Enclosure; 11. Sound-absorbing layer; 12. Damping plate; 13. Sealing strip; 14. Interlayer space; 15. Fixing point; 16. Contact surface; 17. Panel; 18. Through hole; 19. Vent hole; 20. Gap; 21. Support point. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figure 1-3 The image shows a first embodiment of a noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment provided by this utility model. In this embodiment, it includes a cover body 10, a sound-absorbing layer 11, a damping plate 12, and a sealing strip 13. The cover body has a box-like structure. A sound-absorbing layer is attached to the inner wall of the cover body. The damping plate is fixedly installed on the outer wall of the cover body. The sealing strip is located at the bottom edge of the cover body. A sandwich space 14 is formed between the inner wall and the outer wall of the cover body. The thickness of the sound-absorbing layer decreases in a stepped manner along the height direction of the cover body. The damping plate is connected to the outer wall of the cover body through multiple fixing points 15. The contact surface 16 between the sealing strip and the bottom edge of the cover body is wavy.

[0035] In the above technical solution, the cover is assembled from multiple plates 17 by bolts. The connection between adjacent plates is made by overlapping, and the overlap width is one-tenth to one-eighth of the width of a single plate.

[0036] Furthermore, in the above technical solution, the surface of the sound-absorbing layer is provided with a plurality of uniformly distributed through holes 18, the diameter of the through holes expands in a trumpet shape along the thickness direction of the sound-absorbing layer, and the spacing between the through holes is smaller than the maximum diameter of a single through hole.

[0037] Furthermore, in the above technical solution, the damping plate has a corrugated plate structure, the height difference between the crests and troughs of the corrugations is two to three times the overall thickness of the damping plate, and the corrugation extension direction is arranged perpendicular to the height direction of the cover.

[0038] Furthermore, in the above technical solution, the cross-section of the sealing strip is a hollow rectangular structure, and the area of ​​the hollow part accounts for one-third to one-half of the total cross-sectional area of ​​the sealing strip. The sealing strip is fixedly connected to the bottom edge of the cover by adhesive bonding.

[0039] Furthermore, in the above technical solution, the top of the cover has an arched structure, the radius of curvature of the arched structure is one-half to two-thirds of the width of the bottom of the cover, and an exhaust hole 19 is provided at the center of the top of the cover.

[0040] Furthermore, in the above technical solution, a gap 20 is provided between the sound-absorbing layer and the inner wall of the enclosure. The width of the gap is one-fifth to one-quarter of the thickness of the sound-absorbing layer. The sound-absorbing layer maintains a fixed distance from the inner wall of the enclosure through multiple support points 21.

[0041] Furthermore, in the above technical solution, the fixing points of the damping plate are distributed in a grid pattern on the outer wall of the cover, and the distance between adjacent fixing points is one-fifth to one-third of the side length of the damping plate.

[0042] Furthermore, in the above technical solution, the height of the crest of the wavy undulation of the sealing strip is greater than the depth of the trough, and the horizontal distance between the crest and the trough is one-fifteenth to one-tenth of the total length of the sealing strip.

[0043] Furthermore, in the above technical solution, the interlayer space of the enclosure is filled with sound insulation material, and the sound insulation material is kept in a non-contact state with both the inner and outer walls of the enclosure. The sound insulation material is fixed in the middle of the interlayer space by suspension.

[0044] The method of using this utility model is as follows: After the installation of the mining powder processing equipment is completed, the various panels of the noise reduction and sound insulation cover are transported to the vicinity of the equipment in a predetermined order. First, the bottom panel is placed on the equipment base, and the position of the panel is adjusted so that its relative position to the equipment meets the design requirements. Then, the side panels are erected one by one, and adjacent panels are connected and fixed at the overlapping parts with bolts. During the connection process, attention should be paid to maintaining the verticality of the panels and the flatness between adjacent panels to avoid deformation of the overall structure due to tilting or misalignment of the panels. After the top arched panel is hoisted into place, it is also connected and fixed to the side panels with bolts to complete the overall assembly of the cover. Check the tightness of the bolts at the connection parts of each panel of the cover to ensure that all bolts are tightened. The sealing strip is pasted and fixed along the bottom edge of the cover. During the pasting process, it is necessary to ensure that the sealing strip is in full contact with the edge of the cover without leaving gaps. The wavy undulation of the sealing strip should face the base surface so that the crest part of the wavy part is fully pressed against the base to form a seal under the weight of the cover. Observe the interior of the enclosure through the vents at the top to confirm that the sound-absorbing layer, damping plates, and sound insulation materials are all correctly installed and not loose or detached. Start the mining powder processing equipment for trial operation, and use noise measuring instruments to measure the noise intensity at different locations on the outside of the enclosure to verify whether the noise reduction effect meets the design requirements. During daily use, the sealing condition of the sealing strips should be checked regularly. If the sealing strips are found to be aged or damaged, they should be replaced in time. The tightness of the bolts connecting the enclosure panels should be checked regularly. If they are loose, they should be tightened in time. The vents at the top of the enclosure should be cleaned regularly to prevent dust from clogging and affecting the exhaust effect. Through standardized installation and regular maintenance, the noise reduction and sound insulation enclosure can be guaranteed to play a stable role in noise reduction and sound insulation for a long time.

[0045] The following is a specific embodiment 1 of this utility model: The noise reduction and sound insulation cover structure in this embodiment is used to cover the exterior of a 55kW mining ball mill. The cover is made of 3mm thick steel plate, and the overall cover is a rectangular box structure with a length of 4500mm, a width of 3500mm, and a height of 3000mm. The cover is assembled from 6 plates connected by bolts with a diameter of 10mm, namely a bottom plate, two front and rear side plates, two left and right end plates, and a top plate. The overlap width of adjacent plates is 80mm. A 150mm thick sandwich space is formed between the inner and outer walls of the cover. The sandwich space is achieved by welding reinforcing ribs between the inner and outer walls. The reinforcing ribs are made of angle steel and are set every 600mm along the height direction of the cover. The sound-absorbing layer is made of fiberglass wool with a density of 80 kg / m². It is attached to the inner wall of the enclosure, and its thickness decreases in a stepped manner along the height of the enclosure. Specifically, the thickness is 50 mm within the bottom 600 mm height range, 40 mm between 600 mm and 1500 mm, 30 mm between 1500 mm and 2400 mm, and 20 mm from 2400 mm to the top of the enclosure. The surface of the sound-absorbing layer has evenly distributed through-holes with a diameter of 8 mm. These through-holes expand in a trumpet shape along the thickness of the layer. The diameter of the through-holes on the outer surface is 8 mm, and the diameter on the inner surface is 15 mm. The spacing between adjacent through-holes is 12 mm. The damping plate is made of a 2mm thick rubber-steel composite plate, with a 1mm thick rubber layer and a 1mm thick steel plate layer. The damping plate has a corrugated structure with a 5mm height difference between the crests and troughs. The corrugations extend horizontally with a period of 100mm. The damping plate is fixed to the outer wall of the enclosure using 6mm diameter self-tapping screws. The fixing points are distributed in a grid pattern, with a horizontal and vertical distance of 300mm between adjacent fixing points. The sealing strip is made of foamed rubber with a Shore A40D hardness. The cross-section of the sealing strip is a hollow rectangular structure, with an external dimension of 30mm width and 20mm height, and an internal hollow dimension of 20mm width and 12mm height. The sealing strip is bonded to the bottom edge of the enclosure using neoprene adhesive. The wavy undulations of the sealing strip have a peak height of 8mm, a trough depth of 5mm, and a horizontal distance of 180mm between peaks and troughs. The top panel of the enclosure has an arched structure with a radius of curvature of 2000mm, and a circular vent with a diameter of 150mm is located at the center of the top panel. The enclosure's interlayer space is filled with rock wool as sound insulation material, with a density of 100kg / m³. The rock wool is suspended in the middle of the interlayer space by galvanized iron wire, maintaining a non-contact state with both the inner and outer walls of the enclosure, with a gap of approximately 70mm. After actual testing, the noise reduction and sound insulation cover was installed. The noise intensity measured 1m outside the cover when the ball mill was running was 68dB, compared with 95dB when the sound insulation cover was not installed. The noise reduction effect reached 27dB, which significantly improved the mining working environment.The soundproof enclosure operates stably, with all components securely connected and well-sealed. The internal temperature of the enclosure is effectively controlled below 45℃ through the top vent, preventing heat buildup from affecting equipment operation. Simultaneously, the sound-absorbing layer and sound-insulating materials maintain good working condition, showing no decline in sound absorption performance or material aging and detachment during long-term use. The corrugated structure of the damping plate effectively suppresses enclosure vibration, controlling the vibration amplitude of the outer wall surface within 0.3 mm. The wave-shaped structure of the sealing strip forms multiple sealing barriers, effectively preventing sound wave leakage from the bottom of the enclosure. After six months of continuous use, the noise reduction and soundproof enclosure structure has proven to be stable and reliable, meeting the actual noise reduction requirements of mining powder processing equipment.

[0046] The following is another specific embodiment 2 of this utility model: This embodiment is based on embodiment 1, but improves the gap structure between the sound-absorbing layer and the inner wall of the enclosure. Multiple support seats are welded to the inner wall of the enclosure. The support seats are made of L-shaped angle steel, with a side length of 30 mm and a thickness of 3 mm. The support seats are distributed in a grid pattern along the inner wall of the enclosure, with a horizontal and vertical distance of 500 mm between adjacent support seats. The sound-absorbing layer maintains a 10 mm gap with the inner wall of the enclosure through the support seats. A 5 mm thick rubber pad is pasted on the back of the sound-absorbing layer at the position corresponding to the support seat. The function of the rubber pad is to prevent the sound-absorbing layer from directly contacting the support seat and forming a sound bridge, while also providing a buffer. The improved structure prevents the sound-absorbing layer from colliding with the support due to vibration. It forms a 10mm thick air layer between the sound-absorbing layer and the inner wall of the enclosure. The air layer and the sound-absorbing layer together form a composite sound-absorbing structure. The air layer can effectively absorb low-frequency sound waves of 100~500Hz, while the sound-absorbing layer can effectively absorb mid-to-high-frequency sound waves of 500~8000Hz. The two work together to achieve effective absorption of noise across the entire frequency band. After testing, the low-frequency noise intensity measured at 1m outside the enclosure after adopting this improved structure was further reduced by 5dB compared with Example 1. The overall noise reduction effect is more significant, especially in suppressing the low-frequency vibration noise generated during the operation of the ball mill.

[0047] The following is another specific embodiment 3 of this utility model: This embodiment improves the fixing method of the damping plate based on embodiment 1. A vibration isolation pad is added between the damping plate and the outer wall of the enclosure. The vibration isolation pad is made of neoprene rubber with a Shore A50D hardness. The vibration isolation pad is a circular pad with a diameter of 25 mm and a thickness of 5 mm. A 7 mm diameter through hole is opened in the center of the vibration isolation pad for a self-tapping screw to pass through. At each fixing point, the vibration isolation pad is first placed on the outer wall of the enclosure, then the damping plate is pressed onto the vibration isolation pad, and finally the damping plate and the vibration isolation pad are fixed together to the outer wall of the enclosure using self-tapping screws. This improved structure allows for a flexible connection between the damping plate and the outer wall of the enclosure through the vibration isolation pad. The elastic properties of the vibration isolation pad can absorb vibration energy. It also prevents the transmission of vibration between the damping plate and the cover. When the vibration generated by the equipment operation is transmitted to the cover, the vibration isolation pad first undergoes elastic deformation to absorb part of the vibration energy. The remaining vibration energy is transmitted to the damping plate and further consumed by the corrugated structure of the damping plate. This dual vibration reduction structure significantly improves the vibration attenuation effect. After testing, the vibration amplitude of the outer wall of the cover was reduced by about 40% compared with Example 1 after adopting this improved structure, and the vibration radiation noise was reduced by about 3dB. At the same time, the setting of the vibration isolation pad also avoids the metal friction noise that may be generated by the direct contact between the damping plate and the cover, further improving the overall performance of the noise reduction and sound insulation cover. This improved structure is particularly suitable for mining powder processing equipment with large vibration intensity and can more effectively control the outward propagation of vibration noise.

[0048] Specifically, the principle of this invention is to achieve efficient noise reduction and sound insulation by constructing a multi-layered sound wave blocking and absorption system. The interlayer space formed between the inner and outer walls of the enclosure constitutes the first sound wave blocking barrier. When sound waves propagate outward from the inner wall of the enclosure, they first enter the closed cavity of the interlayer space. The sound waves undergo multiple reflections and refractions within the cavity, significantly extending the propagation path and causing the sound energy to attenuate continuously during propagation. The sound-absorbing material suspended and filled within the interlayer space forms the second sound-absorbing barrier. The porous structure of the sound-absorbing material can capture sound waves and convert sound energy into heat energy through friction. Since the sound-absorbing material remains in a non-contact state with the enclosure walls, the formation of sound bridges is avoided, ensuring that the sound absorption effect of the sound-absorbing material is not reduced due to solid-borne sound transmission. The design of the sound-absorbing layer, with its thickness decreasing in a stepped manner along the height of the enclosure, is based on the principle that sound waves of different frequencies penetrate to different depths. Low-frequency sound waves have strong penetrating power and require a thicker sound-absorbing layer for absorption, while high-frequency sound waves have weak penetrating power and can be effectively absorbed by a thinner sound-absorbing layer. The stepped distribution ensures that sound waves of each frequency band are fully absorbed at the corresponding thickness of the sound-absorbing layer. The horn-shaped expansion holes on the surface of the sound-absorbing layer form a gradually changing impedance matching structure for sound waves, reducing sound wave reflection on the surface of the sound-absorbing layer and improving the efficiency of sound waves entering the interior of the sound-absorbing layer, thereby enhancing the sound absorption effect. The corrugated plate structure of the damping plate increases both structural stiffness and surface area. When vibration energy is transferred to the damping plate, the corrugated structure consumes the vibration energy through its own elastic deformation and the internal damping effect of the material. The damping plate is connected to the enclosure through multiple grid-distributed fixing points, dividing the enclosure surface into multiple independent vibration units and preventing the propagation and diffusion of vibration on the enclosure surface. The hollow rectangular cross-section structure of the sealing strip provides excellent elasticity and compressibility, while the wavy undulations of the contact surface form multiple sealing barriers, effectively blocking sound wave leakage channels. The arched structure at the top of the enclosure causes sound waves to diffuse and reflect, preventing the formation of standing waves and reducing the accumulation of sound energy inside the enclosure. Through the synergistic effect of the above-mentioned multiple technical features, this invention achieves multi-layered sound wave blocking, multi-frequency absorption, and effective dissipation of vibration energy, fundamentally solving the technical problem of unsatisfactory sound insulation in existing technologies.

Claims

1. A noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment, comprising a cover body, a sound-absorbing layer, a damping plate, and a sealing strip; the cover body has a box-like structure, a sound-absorbing layer is attached to the inner wall surface of the cover body, the damping plate is fixedly installed on the outer wall surface of the cover body, and the sealing strip is located at the bottom edge of the cover body; characterized in that a sandwich space is formed between the inner wall surface and the outer wall surface of the cover body, the thickness of the sound-absorbing layer decreases in a stepped manner along the height direction of the cover body, the damping plate is connected to the outer wall surface of the cover body through multiple fixing points, and the contact surface between the sealing strip and the bottom edge of the cover body is wavy.

2. The noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment according to claim 1, characterized in that, The cover is assembled from multiple plates connected by bolts. The joints between adjacent plates are connected by overlapping, with the overlap width being one-tenth to one-eighth of the width of a single plate.

3. The noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment according to claim 2, characterized in that, The surface of the sound-absorbing layer has multiple uniformly distributed through holes. The diameter of the through holes expands in a trumpet shape along the thickness direction of the sound-absorbing layer, and the spacing between the through holes is smaller than the maximum diameter of a single through hole.

4. The noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment according to claim 3, characterized in that, The damping plate has a corrugated structure. The height difference between the crests and troughs of the corrugations is two to three times the overall thickness of the damping plate. The corrugations extend perpendicularly to the height direction of the cover.

5. The noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment according to claim 4, characterized in that, The sealing strip has a hollow rectangular cross-section, with the hollow portion accounting for one-third to one-half of the total cross-sectional area of ​​the sealing strip. The sealing strip is fixedly connected to the bottom edge of the cover by adhesive bonding.

6. The noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment according to claim 5, characterized in that, The top of the cover has an arched structure with a radius of curvature that is one-half to two-thirds of the width of the bottom of the cover. An exhaust hole is located at the center of the top of the cover.

7. The noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment according to claim 6, characterized in that, A gap is provided between the sound-absorbing layer and the inner wall of the enclosure. The width of the gap is one-fifth to one-quarter of the thickness of the sound-absorbing layer. The sound-absorbing layer maintains a fixed distance from the inner wall of the enclosure through multiple support points.

8. The noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment according to claim 7, characterized in that, The damping plate's fixing points are distributed in a grid pattern on the outer wall of the cover, with the distance between adjacent fixing points being one-fifth to one-third of the damping plate's side length.

9. The noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment according to claim 8, characterized in that, The height of the crests of the wavy undulations of the sealing strip is greater than the depth of the troughs, and the horizontal distance between the crests and troughs is one-fifteenth to one-tenth of the total length of the sealing strip.

10. The noise reduction and sound insulation cover structure for an environmentally friendly and energy-saving mining powder processing equipment according to claim 9, characterized in that, The interlayer space of the enclosure is filled with sound insulation material. The sound insulation material is kept in a non-contact state with the inner and outer walls of the enclosure. The sound insulation material is fixed in the middle of the interlayer space by suspension.

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