Engineering machinery sound insulation device

Abstract

The utility model provides an engineering machinery sound insulation device, and relates to the technical field of engineering machinery. The engineering machinery sound insulation device comprises a mounting frame, a ventilation noise elimination structure and a sound insulation plate, the surface of each frame in the mounting frame is provided with a damping rubber coating, the sound insulation plate is mounted on the mounting frame, the sound insulation plate and the mounting frame form a sound insulation cover used for surrounding a power cabin, the sound insulation cover comprises a top plate and a bottom plate, and the top plate and the bottom plate are arranged on the mounting frame. The two ventilation and noise elimination structures are installed on the top plate and the bottom plate correspondingly and communicate with the interior of the sound insulation cover. The power cabin can be covered with the sound insulation cover, vibration generated by the power cabin is counteracted through the damping rubber coating, air outside the sound insulation cover can enter the sound insulation cover through the ventilation and noise elimination structure on the bottom plate to exchange heat with the power cabin, and then the air flows out of the sound insulation cover through the ventilation and noise elimination structure on the top plate. Therefore, the shock absorption and noise reduction effects of the engine compartment can be achieved simultaneously.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a sound insulation device for engineering machinery. Background Art

[0002] Currently, high-power construction machinery often uses diesel engines as a power source to drive hydraulic systems. This generates significant structural vibration noise, adversely impacting the surrounding environment. To reduce the intensity of noise radiating into the surrounding space, manufacturers typically centralize the power system in the engine compartment and enclose it with a machine assembly. To dissipate heat, the machine assembly is currently often constructed of thin-walled steel plates with cooling grilles, and the interior surface of the machine assembly is covered with sound-absorbing materials such as glass wool. Although this type of machine assembly provides good heat dissipation, it lacks sound insulation and noise reduction effectiveness. Utility Model Content

[0003] The problem solved by the utility model is how to improve the sound insulation and noise reduction effects.

[0004] To solve the above problems, the present invention provides a sound insulation device for engineering machinery, comprising a mounting frame, a ventilation and sound-absorbing structure, and a sound insulation board. The surface of each frame in the mounting frame is provided with a damping rubber coating. The sound insulation board is mounted on the mounting frame and forms a sound insulation cover with the mounting frame to surround the power compartment. The sound insulation cover comprises a top plate and a bottom plate. The two ventilation and sound-absorbing structures are respectively mounted on the top plate and the bottom plate and are connected to the interior of the sound insulation cover.

[0005] Optionally, the ventilation and sound-absorbing structure includes a cylindrical tube installed on the top plate and the bottom plate, and a porous sound-absorbing material filled and fixed in the cylindrical tube.

[0006] Optionally, the sound insulation board includes an outer thin-walled steel plate, an inner thin-walled steel plate, and an intermediate interlayer rubber plate connected between the outer thin-walled steel plate and the inner thin-walled steel plate, and the inner thin-walled steel plate is connected to the mounting frame.

[0007] Optionally, the sound insulation board further comprises a perforated foam aluminum plate, and the perforated foam aluminum plate is installed on a side of the inner thin-walled steel plate facing away from the outer thin-walled steel plate.

[0008] Optionally, the sound insulation board further includes a polyurethane support pad, and the polyurethane support pad is connected between the perforated foam aluminum plate and the inner thin-walled steel plate.

[0009] Optionally, the intermediate interlayer rubber plate includes a rubber plate body, a steel column and silicone. The rubber plate body is provided with a through hole, which passes through the rubber plate body. The steel column is located in the through hole, the axis of the steel column is perpendicular to the axis of the through hole, and the steel column is connected to the inner wall of the through hole through silicone.

[0010] Optionally, the silica gel is wrapped around the steel column.

[0011] Optionally, the engineering machinery sound insulation device further includes a chassis, which is fixed below the bottom plate, and a damping rubber gasket is provided between the chassis and the bottom plate.

[0012] Optionally, the inner thin-walled steel plate is mounted to the mounting frame via damping rubber-coated bolts.

[0013] Optionally, adjacent frames in the mounting frame are connected by damping rubber-coated bolts.

[0014] Compared with the prior art, the engineering machinery sound insulation device of the present invention is provided with a damping rubber coating on the surface of each frame in the mounting frame, and the sound insulation board is installed on the mounting frame, so that the sound insulation board and the mounting frame can form a sound insulation cover, and the sound insulation cover can cover the power cabin, and use the damping rubber coating to offset the vibration generated by the power cabin. Then, two ventilation and sound-absorbing structures are respectively installed on the top plate and the bottom plate of the sound insulation cover and connected to the sound insulation cover to form a heat dissipation channel between the bottom plate and the top plate. The air outside the sound insulation cover can enter the sound insulation cover through the ventilation and sound-absorbing structure on the bottom plate to exchange heat with the power cabin, and then flow out of the sound insulation cover from the ventilation and sound-absorbing structure on the top plate, thereby achieving the effect of vibration reduction and noise reduction of the power cabin at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the internal structure of the engineering machinery sound insulation device in an embodiment of the present utility model;

[0016] Figure 2 Schematic diagram of the structure of the sound insulation board in the embodiment of the present utility model;

[0017] Figure 3 This is a schematic structural diagram of an outer thin-walled steel plate in an embodiment of the present utility model;

[0018] Figure 4 This is an assembly diagram of the engineering machinery sound insulation device in an embodiment of the present utility model;

[0019] Figure 5 This is a frequency response diagram of the local resonance phononic crystal structure in an embodiment of the present invention.

[0020] Description of reference numerals:

[0021] 1-Installation frame; 2-Ventilation and sound-absorbing structure; 21-Cylindrical tube; 22-Porous sound-absorbing material; 3-Sound insulation board; 31-Outer thin-walled steel plate; 331-Rubber plate body; 332-Steel column; 333-Silicone gel; 32-Inner thin-walled steel plate; 33-Middle interlayer rubber plate; 34-Perforated foam aluminum plate; 35-Polyurethane support pad; 4-Power compartment; 5-Top plate; 6-Bottom plate; 7-Chassis; 8-Damping rubber gasket. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] In the accompanying drawings, the Z-axis represents a vertical position, and the positive direction of the Z-axis (that is, the direction of the arrow on the Z-axis) represents the upper side, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents the lower side; in the accompanying drawings, the X-axis represents a horizontal position, and the positive direction of the X-axis (that is, the direction of the arrow on the X-axis) represents the right side, and the negative direction of the X-axis (that is, the direction opposite to the positive direction of the X-axis) represents the left side; in the accompanying drawings, the Y-axis represents a front-to-back position, and the positive direction of the Y-axis (that is, the direction of the arrow on the Y-axis) represents the front side, and the negative direction of the Y-axis (that is, the direction opposite to the positive direction of the Y-axis) represents the rear side. It should also be noted that the aforementioned Z-axis, Y-axis, and X-axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0025] Combine Figure 1 and Figure 4 As shown, the utility model provides a sound insulation device for engineering machinery, comprising a mounting frame 1, a ventilation and sound-absorbing structure 2 and a sound insulation board 3. The surface of each frame in the mounting frame 1 is provided with a damping rubber coating. The sound insulation board 3 is mounted on the mounting frame 1 and forms a sound insulation cover with the mounting frame 1 to surround the power compartment 4. The sound insulation cover includes a top plate 5 and a bottom plate 6. Two ventilation and sound-absorbing structures 2 are respectively mounted on the top plate 5 and the bottom plate 6 and are connected to the interior of the sound insulation cover.

[0026] Specifically, the mounting frame 1 can be a regular hexagonal frame structure, in which adjacent frames of the regular hexagonal frame structure are welded. After welding, a damping rubber coating is provided on the surface of each frame. The number of sound insulation panels 3 can be six, and the six sound insulation panels 3 are bolted to the six faces of the mounting frame 1 to form a regular hexagonal sound insulation enclosure with the mounting frame 1. The power cabin 4 can be assembled within the regular hexagonal sound insulation enclosure via the power cabin 4 mounting bracket, so that the regular hexagonal sound insulation enclosure covers the power cabin 4. In the regular hexagonal sound insulation enclosure, the regular hexagonal sound insulation enclosure includes a top plate 5 located in the positive direction of the Z axis and a bottom plate 6 located in the negative direction of the Z axis. That is, the top plate 5 is the sound insulation panel 3 located above the power cabin 4, and the bottom plate 6 is the sound insulation panel 3 located below the power cabin 4. Each of the six sound insulation panels 3 maintains a certain gap with the power compartment 4 to facilitate air flow out of the channel. Circular holes are provided at the center of the top plate 5 and bottom plate 6, respectively, and are connected to the interior of the regular hexagonal sound insulation enclosure. Two ventilation and sound-absorbing structures 2 are mounted at the circular holes of the top plate 5 and bottom plate 6, respectively. Air can enter the sound insulation enclosure from one ventilation and sound-absorbing structure 2 and exit from the other ventilation and sound-absorbing structure 2, thereby forming a ventilation and heat dissipation channel. The damping rubber coating on the mounting frame 1 offsets the vibrations generated by the power compartment 4 during operation. At the same time, external air can enter the regular hexagonal sound insulation enclosure from the ventilation and sound-absorbing structure 2 on the bottom plate 6 and flow upward to exchange heat with the power compartment 4. The heat-exchanged air then flows out of the regular hexagonal sound insulation enclosure through the ventilation and sound-absorbing structure 2 on the top plate 5, achieving heat dissipation of the power compartment 4. During operation of the power compartment 4, the ventilation and sound-absorbing structure 2 can reduce the noise generated by the power compartment 4, thereby achieving noise reduction for the power compartment 4.

[0027] Therefore, in this embodiment, a damping rubber coating is provided on the surface of each frame of the mounting frame 1, and the sound insulation board 3 is installed on the mounting frame 1, so that the sound insulation board 3 and the mounting frame 1 can form a sound insulation enclosure. The sound insulation enclosure can cover the power compartment 4 and use the damping rubber coating to offset the vibration generated by the power compartment 4. Then, two ventilation and sound-absorbing structures 2 are respectively installed on the top plate 5 and the bottom plate 6 of the sound insulation enclosure and connected to the sound insulation enclosure to form a heat dissipation channel between the bottom plate 6 and the top plate 5. The air outside the sound insulation enclosure can enter the sound insulation enclosure through the ventilation and sound-absorbing structure 2 on the bottom plate 6 to exchange heat with the power compartment, and then flow out of the sound insulation enclosure through the ventilation and sound-absorbing structure 2 on the top plate 5, thereby achieving the effect of reducing vibration and noise of the power compartment 4.

[0028] Optionally, combined Figure 1 As shown, the ventilation and sound-absorbing structure 2 includes a cylindrical tube 21 installed on the top plate 5 and the bottom plate 6 , and a porous sound-absorbing material 22 filled and fixed in the cylindrical tube 21 .

[0029] Specifically, the ventilation and sound-absorbing structure 2 on the bottom plate 6 is used as an example. A cylindrical tube 21 is fixed to a circular hole in the bottom plate 6, connecting it to the soundproof enclosure. A porous sound-absorbing material 22 is fixed inside the cylindrical tube 21. This porous sound-absorbing material 22 counteracts the sound waves generated by the engine compartment 4, achieving a noise reduction effect within the engine compartment 4. Thus, with the porous sound-absorbing material 22 filling and affixed to the cylindrical tube 21, which is mounted on the top plate 5 and bottom plate 6, the cylindrical tube 21 supports and limits the porous sound-absorbing material 22, ensuring its stability.

[0030] In some embodiments, the ventilation and sound-absorbing structure 2 may further include an inner cylindrical tube having a smaller diameter than the cylindrical tube 21, with coaxial rings welded to each of the axial ends of the cylindrical tube 21. The ventilation and sound-absorbing structure 2 on the base plate 6 is still used as an example. The cylindrical tube 21 is welded to the base plate 6 via the ring proximal to the soundproof enclosure. The upper end of the inner cylindrical tube extends into the cylindrical tube 21 and is fixed to the ring distal to the soundproof enclosure. The lower end of the inner cylindrical tube extends from the cylindrical tube 21. A porous sound-absorbing material 22 is filled between the two cylindrical surfaces and the two rings, enabling communication with an external air supply device or air supply pipeline via the inner cylindrical tube.

[0031] In the embodiment of the above-mentioned ventilation and silencer structure 2, the two ventilation and silencer structures 2 may be of the same structure. In another embodiment, the two ventilation and silencer structures 2 may also be different, that is, in the top plate 5, since the ventilation and silencer structure 2 on the top plate 5 can be used as an air outlet, a cover can be provided at the air outlet of the ventilation and silencer structure 2. The cover is installed at the air outlet of the ventilation and silencer structure 2 and a gap is retained between the cover and the air outlet, so that the exhausted gas can be discharged along the radial direction of the cylindrical tube 21, so that the cover can be used to prevent external debris from blocking the outlet of the cylindrical tube 21 to ensure smooth air outlet.

[0032] Optionally, combined Figure 2 As shown, the sound insulation board 3 includes an outer thin-walled steel plate 31 , an inner thin-walled steel plate 32 and an intermediate interlayer rubber plate 33 connected between the outer thin-walled steel plate 31 and the inner thin-walled steel plate 32 , and the inner thin-walled steel plate 32 is connected to the installation frame 1 .

[0033] Specifically, the inner thin-walled steel plate 32 faces the interior of the soundproof enclosure, that is, the engine compartment 4. The outer thin-walled steel plate 31 faces the exterior of the soundproof enclosure, that is, the exterior facing away from the engine compartment 4. The intermediate rubber sheet 33 can be attached between the outer thin-walled steel plate 31 and the inner thin-walled steel plate 32 by gluing. Assembly holes are reserved in the outer thin-walled steel plate 31, the inner thin-walled steel plate 32, and the intermediate rubber sheet 33, allowing mounting bolts to pass through the reserved assembly holes to attach the inner thin-walled steel plate 32 to the mounting frame 1.

[0034] In this way, the intermediate interlayer rubber plate 33 is connected between the outer thin-walled steel plate 31 and the inner thin-walled steel plate 32, and the inner thin-walled steel plate 32 is connected to the mounting frame 1. The outer thin-walled steel plate 31 and the inner thin-walled steel plate 32 can support the intermediate interlayer rubber plate 33, and the intermediate interlayer rubber plate 33 can reduce the vibration of the outer thin-walled steel plate 31 and the inner thin-walled steel plate 32, and then the intermediate interlayer rubber plate 33 can be used to offset the vibration generated by the power compartment 4.

[0035] Optionally, combined Figure 1 and Figure 2 As shown, the sound insulation board 3 further includes a perforated foam aluminum plate 34 , which is installed on a side of the inner thin-walled steel plate 32 facing away from the outer thin-walled steel plate 31 .

[0036] Specifically, the perforated foam aluminum plate 34 refers to a foam aluminum plate provided with a plurality of through holes, and the plurality of through holes penetrate the foam aluminum plate in a direction perpendicular to the foam aluminum plate (generally in a thickness direction).

[0037] In this way, by installing the perforated foam aluminum plate 34 on the end of the inner thin-walled steel plate 32 facing away from the outer thin-walled steel plate 31, the hole structure on the perforated foam aluminum plate 34 can weaken the energy of the sound wave, thereby further achieving the noise reduction effect of the power cabin 4.

[0038] Optionally, combined Figure 2 As shown, the sound insulation board 3 further includes a polyurethane support pad 35 , which is connected between the perforated foam aluminum plate 34 and the inner thin-walled steel plate 32 .

[0039] Specifically, the polyurethane support pad 35 can be installed between the perforated foam aluminum plate 34 and the inner thin-walled steel plate 32 by gluing or threaded fasteners. In this way, the polyurethane support pad 35 is connected between the perforated foam aluminum plate 34 and the inner thin-walled steel plate 32 to achieve separation of the perforated foam aluminum plate 34 and the inner thin-walled steel plate 32, thereby preventing the perforated foam aluminum plate 34 and the inner thin-walled steel plate 32 from direct contact and electrochemical corrosion. The perforated foam aluminum plate 34 is also used to improve heat dissipation efficiency. When sound waves propagate between the perforated foam aluminum plate 34 and the inner thin-walled steel plate 32, the sound waves are scattered, reverberated, and frictionally dissipated to dissipate vibration energy, thereby achieving the purpose of sound absorption and noise reduction.

[0040] Optionally, combined Figure 2 and Figure 3 As shown, the middle interlayer rubber plate 33 includes a rubber plate body 331, a steel column 332 and a silicone rubber 333. The rubber plate body 331 is provided with a through hole, which passes through the rubber plate body 331. The steel column 332 is located in the through hole. The axis of the steel column 332 is perpendicular to the axis of the through hole. The steel column 332 is connected to the inner wall of the through hole through the silicone rubber 333.

[0041] Specifically, the penetration direction of the through hole is the thickness direction of the rubber plate body 331, the steel column 332 is located in the through hole, and the axis of the steel column 332 is perpendicular to the axis of the through hole, and the steel column 332 is connected to the inner wall of the through hole through the silicone 333. The diameter of the steel column 332 is smaller than the length of the through hole, so that the steel column 332 is completely embedded in the through hole.

[0042] In this way, a through hole is provided on the rubber plate body 331, the through hole passes through the rubber plate body 331, the steel column 332 is located in the through hole, the axis of the steel column 332 is perpendicular to the axis of the through hole, and the steel column 332 is connected to the inner wall of the through hole through the silicone 333, so that the rubber plate body 331 can serve as a matrix, the steel column 332 serves as a scatterer, and the silicone 333 serves as a local resonant phononic crystal structure of the coating layer, so as to utilize the local resonant phononic crystal structure to achieve noise reduction of the intermediate interlayer rubber plate 33.

[0043] Combined with the above embodiments, combined with Figure 5 As shown, taking the frequency range of 150-450Hz of low-frequency noise source of engineering machinery as an example, Figure 5 The frequency responses of the local resonance phononic crystal structure and the frequency responses of the non-local resonance phononic crystal structure are given. Figure 5 It can be seen that in the low-frequency range of 150-450Hz, the transmission loss of the phononic crystal structure is significantly improved, indicating that the noise in this frequency range is significantly attenuated.

[0044] Optionally, the silica gel 333 is wrapped around the steel column 332. In this way, it is easy to install the steel column 331 in the through hole through the silica gel 333.

[0045] Optionally, combined Figure 1 and Figure 4 As shown, the engineering machinery sound insulation device further includes a chassis 7 , which is fixed below the bottom plate 6 , and a damping rubber gasket 8 is provided between the chassis 7 and the bottom plate 6 .

[0046] Specifically, the damping rubber gasket 8 can be installed between the chassis 7 and the bottom plate 6 using threaded fasteners. The damping rubber gasket 8 reduces the vertical vibration of the engine compartment 4. Thus, by fixing the chassis 7 below the bottom plate 6 and further providing the damping rubber gasket 8 between the chassis 7 and the bottom plate 6, the vibration reduction effect of the engine compartment 4 can be further enhanced.

[0047] Optionally, the inner thin-walled steel plate 32 is mounted on the mounting frame 1 by means of damping rubber-coated bolts.

[0048] Specifically, the damping rubber-coated bolts can be understood as bolts with a damping rubber coating. Thus, the inner thin-walled steel plate 32 is mounted to the mounting frame 1 via the damping rubber-coated bolts. The damping rubber-coated bolts can reduce vibration between the inner thin-walled steel plate 32 and the mounting frame 1, preventing the occurrence of acoustic bridges across the sound insulation panel 3 and further enhancing the vibration isolation effect of the sound insulation panel 3.

[0049] Optionally, adjacent frames in the mounting frame 1 are connected by damping rubber-coated bolts. Specifically, after adjacent frames in the mounting frame 1 are connected by the damping rubber-coated bolts, the adjacent frames are welded. Thus, by connecting adjacent frames in the mounting frame 1 by the damping rubber-coated bolts, the damping rubber-coated bolts position each adjacent frame in the mounting frame 1, preventing adjacent frames from being welded due to vibration, thereby improving the structural stability of the mounting frame 1.

[0050] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present utility model.

Claims

1. A sound insulation device for engineering machinery, characterized in that: The invention comprises a mounting frame (1), a ventilation and sound-absorbing structure (2), and a sound insulation board (3); each frame surface of the mounting frame (1) is provided with a damping rubber coating; the sound insulation board (3) is mounted on the mounting frame (1) and forms a sound insulation cover with the mounting frame (1) for surrounding a power cabin (4); the sound insulation cover comprises a top plate (5) and a bottom plate (6); the two ventilation and sound-absorbing structures (2) are respectively mounted on the top plate (5) and the bottom plate (6), and are in communication with the interior of the sound insulation cover.

2. The engineering machinery sound insulation device according to claim 1, characterized in that: The ventilation and sound-absorbing structure (2) comprises a cylindrical tube (21) mounted on the top plate (5) and the bottom plate (6), and a porous sound-absorbing material (22) filled in and fixed in the cylindrical tube (21).

3. The engineering machinery sound insulation device according to claim 1, characterized in that: The sound insulation board (3) comprises an outer thin-walled steel plate (31), an inner thin-walled steel plate (32), and an intermediate interlayer rubber plate (33) connected between the outer thin-walled steel plate (31) and the inner thin-walled steel plate (32), and the inner thin-walled steel plate (32) is connected to the mounting frame (1).

4. The engineering machinery sound insulation device according to claim 3, characterized in that: The sound insulation board (3) further comprises a perforated foam aluminum plate (34), and the perforated foam aluminum plate (34) is installed on a side of the inner thin-walled steel plate (32) facing away from the outer thin-walled steel plate (31).

5. The engineering machinery sound insulation device according to claim 4, characterized in that: The sound insulation board (3) further comprises a polyurethane support pad (35), wherein the polyurethane support pad (35) is connected between the perforated foam aluminum plate (34) and the inner thin-walled steel plate (32).

6. The engineering machinery sound insulation device according to claim 3, characterized in that: The intermediate interlayer rubber plate (33) comprises a rubber plate body (331), a steel column (332) and a silica gel (333). The rubber plate body (331) is provided with a through hole, the through hole passes through the rubber plate body (331), the steel column (332) is located in the through hole, the axis of the steel column (332) is perpendicular to the axis of the through hole, and the steel column (332) is connected to the inner wall of the through hole through the silica gel (333).

7. The engineering machinery sound insulation device according to claim 6, characterized in that: The silica gel (333) is arranged to wrap the steel column (332).

8. The engineering machinery sound insulation device according to claim 1, characterized in that: It also includes a chassis (7), which is fixed below the bottom plate (6), and a damping rubber gasket (8) is provided between the chassis (7) and the bottom plate (6).

9. The engineering machinery sound insulation device according to claim 3, characterized in that: The inner thin-walled steel plate (32) is mounted on the mounting frame (1) via damping rubber-coated bolts.

10. The engineering machinery sound insulation device according to claim 1, characterized in that: Adjacent frames in the installation frame (1) are connected via damping rubber coated bolts.

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