CN221251011U - Acoustic package structure and engineering machinery - Google Patents

Abstract

The utility model relates to the technical field of noise reduction and discloses an acoustic package structure and engineering machinery, wherein the acoustic package structure comprises a bracket component and a sound absorbing component, the bracket component is suitable for being fixedly arranged on a frame, a plurality of sound absorbing components are arranged on the top and the side parts of the bracket component, a containing cavity is enclosed between the sound absorbing components, the containing cavity is suitable for being provided with sound source equipment, the bottom of the sound absorbing component positioned on the side part of the bracket component is suitable for being abutted against the frame.

Description

Acoustic package structure and engineering machinery

Technical Field

The utility model relates to the technical field of noise reduction, in particular to an acoustic bag structure and engineering machinery.

Background

The engineering machinery is a general term of construction machinery for engineering construction, and is widely used in the engineering fields of construction, water conservancy, electric power, roads, mines, ports, national defense and the like. With the development of engineering machinery, operators have put higher demands on noise comfort of the engineering machinery. Operator satisfaction with the comfort of the work machine is mainly manifested in the overall NVH (Noise, vibration, HARSHNESS ride) performance of the work machine.

In the prior art, in order to improve the NVH performance of the engineering machinery, an active noise reduction mode is generally adopted, such as methods of optimizing an engine and a vehicle body mechanism, improving dynamic and static rigidity of the vehicle body, improving a chassis system and the like, to control a noise source and a propagation path, and the improved mode still enables middle and high frequency noise of the engine, a gearbox, a fan and the like to radiate to the outside of the engineering machinery, so that the noise reduction effect is poor, and the comfort of an operator is affected.

Disclosure of utility model

In view of the above, the utility model provides an acoustic bag structure and an engineering machine, which are used for solving the problems that the noise reduction effect of the engineering machine in the prior art is poor and the comfort of operators is affected.

In a first aspect, the present utility model provides an acoustic enclosure structure, including a bracket assembly and a sound absorbing assembly, where the bracket assembly is adapted to be fixedly mounted on a vehicle frame, the plurality of sound absorbing assemblies are mounted on top and side portions of the bracket assembly, a receiving cavity is enclosed between the plurality of sound absorbing assemblies, the receiving cavity is adapted to mount a sound source device, and a bottom portion of the sound absorbing assembly located on the side portion of the bracket assembly is adapted to be abutted against the vehicle frame.

The beneficial effects are that: according to the utility model, the plurality of sound absorbing assemblies are arranged on the bracket assembly and are enclosed into the accommodating cavity, so that a sealed space is formed between the sound absorbing assemblies and the vehicle frame, noise generated by sound source equipment arranged in the accommodating cavity can be absorbed and blocked, noise radiation can be effectively reduced by absorbing the noise from the source head, and driving noise of a cab and the outside of the vehicle is reduced, so that the comfort level of an operator in using engineering machinery is improved.

In an alternative embodiment, the sound absorbing assembly includes a side sound absorbing assembly and a top sound absorbing assembly, the plurality of side sound absorbing assemblies being fixedly mounted to the sides of the bracket assembly, the top sound absorbing assembly being removably mounted to the top of the bracket assembly.

The beneficial effects are that: according to the utility model, the side sound absorption components and the top sound absorption components are arranged on the side part and the top part of the bracket component to form the accommodating cavity capable of covering the sound source equipment, and the accommodating cavity is arranged on the frame to form a sealed structure, so that noise generated by the sound source equipment can be effectively absorbed from the source, the radiation of the noise to the outside is reduced, and the driving noise of a cab and the outside of the automobile is reduced, thereby improving the comfort level of an operator in using engineering machinery, and simultaneously, the detachable top sound absorption component is arranged, so that the sound source equipment in the accommodating cavity can be conveniently installed and overhauled.

In an alternative embodiment, the side sound absorbing assembly includes a first sound absorbing assembly and a second sound absorbing assembly, the plurality of first sound absorbing assemblies are fixedly mounted on the side of the bracket assembly in sequence, the second sound absorbing assembly is fixedly mounted on the side of the bracket assembly, the top sound absorbing assembly is located at the top of the first sound absorbing assembly and the second sound absorbing assembly, and the first sound absorbing assembly, the second sound absorbing assembly and the top sound absorbing assembly enclose a containing cavity therebetween.

In an alternative embodiment, the first sound absorbing assembly includes a first plate fixedly mounted on the bracket assembly and a first sound absorbing layer fixedly mounted on the first plate on a side facing the receiving cavity.

The beneficial effects are that: according to the utility model, the first sound absorption layer is arranged on the inner side of the first plate body, when noise generated by sound source equipment is transmitted into the surface of the first sound absorption layer, part of the noise is reflected, and the other part of the noise rubs with surrounding media when the noise propagates in the first sound absorption layer, so that acoustic energy is lost, and the noise is reduced from radiating to the outer part of the first plate body.

In an alternative embodiment, the first sound absorbing assembly further includes a first fixing member and a first pressing bar, the plurality of first fixing members are fixedly installed on the first plate body, the first pressing bar is connected with the first fixing member, and the first sound absorbing layer is located between the first pressing bar and the first plate body.

The beneficial effects are that: according to the utility model, the first fixing piece and the first pressing strip are arranged on the first sound absorbing assembly, so that the first sound absorbing layer arranged on the first plate body can be fixed, the first sound absorbing layer is more stably arranged, the first sound absorbing layer is prevented from loosening and falling off due to vibration and the like generated in the working process of engineering machinery, and the noise absorption and blocking effects are ensured.

In an alternative embodiment, the second sound absorbing assembly includes a second plate and a second sound absorbing layer, the second plate being fixedly mounted on the bracket assembly, the second plate being provided with heat dissipating holes, the second sound absorbing layer being fixedly mounted on the second plate on a side facing the receiving cavity.

The beneficial effects are that: according to the utility model, the second sound absorbing layer is arranged on the inner side of the second plate body, when noise generated by sound source equipment is transmitted into the surface of the second sound absorbing layer, part of the noise is reflected, and the other part of the noise rubs with surrounding media when the noise propagates in the second sound absorbing layer, so that acoustic energy is lost, and the noise is reduced from radiating to the outer part of the second plate body.

In an alternative embodiment, the top sound absorbing assembly includes a top plate removably mounted to the bracket assembly and a top sound absorbing layer fixedly mounted to the top plate on a side facing the receiving cavity.

The beneficial effects are that: according to the utility model, the top sound absorbing layer is arranged on the inner side of the top plate, when noise generated by sound source equipment is transmitted into the surface of the top sound absorbing layer, part of the noise is reflected, and the other part of the noise rubs with surrounding media when the noise propagates in the top sound absorbing layer, so that the sound energy is lost, and the noise is reduced to radiate outside the top plate.

In an alternative embodiment, the top sound absorbing assembly further comprises a latch, a top mount and a top molding, the latch being fixedly mounted to the top plate on a side facing the bracket assembly, the latch being adapted to be detachably connected to the bracket assembly, the plurality of top mounts being fixedly mounted to the top plate, the top molding being connected to the top mount, and the top sound absorbing layer being located between the top molding and the top plate.

The beneficial effects are that: according to the utility model, the lock catch which can be detached from the bracket assembly is arranged on the top plate, so that the top plate is detached to mount and overhaul the sound source equipment in the accommodating cavity, and the device has the advantages of simple structure and convenience in operation; the top mounting and the top layering on the roof can play fixed effect to the top sound-absorbing layer of installing on the roof, make top sound-absorbing layer installation more firm, avoid engineering machine tool to lead to top sound-absorbing layer not hard up droing at vibration etc. that the course of working produced, guaranteed the absorption and the separation effect to the noise.

In an alternative embodiment, the bracket assembly includes a plurality of uprights and a plurality of cross members, one end of the uprights being adapted to be connected to the frame and the other end being connected to the cross members, and the sound absorbing assembly being mounted on the uprights and cross members.

The beneficial effects are that: according to the utility model, the upright posts and the cross beams are combined into the frame structure, so that the sound absorbing assembly arranged on the bracket assembly can be fixed and supported, and the sound absorbing assembly is more firmly arranged.

In a second aspect, the utility model also provides engineering machinery, which comprises a frame, an acoustic bag structure and sound source equipment, wherein the acoustic bag structure is fixedly arranged on the frame, the accommodating cavity faces the frame, and the sound source equipment is fixedly arranged on the frame and is positioned in the accommodating cavity.

The beneficial effects are that: according to the utility model, the sound source equipment is arranged in the accommodating cavity enclosed between the acoustic package structure and the vehicle frame, the sound absorption component on the acoustic package structure can absorb and block the noise generated by the sound source equipment, and the noise radiation can be effectively reduced by absorbing the noise from the source head, so that the driving noise of the cab and the outside of the vehicle is reduced, and the comfort level of an operator using engineering machinery is improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an acoustic bag structure according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a support assembly in an acoustic enclosure according to an embodiment of the present utility model;

fig. 3 is a schematic structural view of a first sound absorbing assembly in an acoustic bag structure according to an embodiment of the present utility model;

Fig. 4 is a schematic structural view of a top sound absorbing assembly in an acoustic bag structure according to an embodiment of the present utility model;

FIG. 5 is an inside plan view of a top sound absorbing assembly in an acoustic bag structure according to an embodiment of the present utility model;

Fig. 6 is a schematic view of an outer structure of a second sound absorbing assembly in an acoustic bag structure according to an embodiment of the present utility model;

Fig. 7 is a schematic view of an inner side structure of a second sound absorbing assembly in an acoustic bag structure according to an embodiment of the present utility model;

Fig. 8 is a schematic structural diagram of a sound absorbing layer in an acoustic enclosure according to an embodiment of the present utility model.

Reference numerals illustrate:

1. a bracket assembly; 11. a column; 111. a first upright; 112. a second upright; 113. a third upright; 12. a cross beam; 121. a first beam; 122. a second beam; 123. a third beam;

2. A sound absorbing assembly; 21. a side sound absorbing assembly; 211. a first sound absorbing assembly; 2111. a first plate body; 2112. a first sound-absorbing layer; 2113. a first fixing member; 2114. a first batten; 212. a second sound absorbing assembly; 2121. a second plate body; 2122. a heat radiation hole; 2123. a second sound-absorbing layer; 2124. a second fixing member; 2125. a second pressing bar; 22. a top sound absorbing assembly; 221. a top plate; 222. a top sound absorbing layer; 223. locking; 224. a top mount; 225. a top molding; 231. a sound absorbing layer; 232. an adhesive layer; 233. an isolation layer;

3. and a frame.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the related art, most engine cabins of engineering machinery adopt glass fiber reinforced plastics and sheet metal covering parts as cabin structures, even sealing plates at two sides of corresponding engines are not provided, and noise generated by the engines and gearboxes can be directly radiated outside a vehicle, so that larger noise pollution can be generated for operators and working environments in a cab.

Embodiments of the present utility model are described below with reference to fig. 1 to 8.

According to an embodiment of the present utility model, in one aspect, as shown in fig. 1, there is provided an acoustic bag structure, which includes a bracket assembly 1 and a sound absorbing assembly 2, wherein the bracket assembly 1 is adapted to be fixedly mounted on a vehicle frame 3, a plurality of sound absorbing assemblies 2 are mounted on the top and side portions of the bracket assembly 1, a receiving cavity is defined between the plurality of sound absorbing assemblies 2, the receiving cavity is adapted to mount a sound source device, and the bottom of the sound absorbing assembly 2 located on the side portion of the bracket assembly 1 is adapted to abut against the vehicle frame 3.

Specifically, in this embodiment, the bracket assembly 1 is in a rectangular frame structure, the bracket assembly 1 is fixedly mounted on the frame 3, the plurality of sound absorbing assemblies 2 are mounted on the side portion and the top portion of the bracket assembly 1, wherein the sound absorbing assemblies 2 on the side portion are vertically and fixedly mounted on the side portion of the bracket assembly 1, the sound absorbing assemblies 2 on the top portion are detachably mounted on the top portion of the bracket assembly 1, the plurality of sound absorbing assemblies 2 are mounted on the bracket assembly 1 to form a side portion and top seal, the bottom portion is provided with an accommodating cavity, and the sound source device is mounted on the frame 3 and is located in the accommodating cavity.

In this embodiment, the acoustic package structure may be used as an engine compartment of an engineering machine, where sound source devices such as an engine, a gearbox, and a fan are installed, and these sound source devices may generate middle-high frequency noise above 1000Hz when working. In other embodiments, the acoustic enclosure structure also serves as an electric, air conditioning or exhaust system installation compartment, hydraulic system installation compartment, etc. in the work machine.

In this embodiment, the sound absorbing assembly 2 can be selected according to the frequency spectrum characteristics of different engines and gearboxes, and the sound absorbing assembly 2 corresponding to the frequency of the generated noise can be used for reducing the noise for the corresponding noise frequency.

According to the utility model, the plurality of sound absorbing assemblies 2 are arranged on the bracket assembly 1 and are enclosed into the accommodating cavity, so that a sealed space is formed between the sound absorbing assemblies 2 and the frame 3, noise generated by sound source equipment arranged in the accommodating cavity can be absorbed and blocked, noise radiation can be effectively reduced by absorbing the noise from the source head, and driving noise of a cab and the outside of a vehicle is reduced, so that the comfort level of an operator using engineering machinery is improved.

In one embodiment, the sound absorbing assembly 2 includes a side sound absorbing assembly 21 and a top sound absorbing assembly 22, the plurality of side sound absorbing assemblies 21 being fixedly mounted on the side of the bracket assembly 1, the top sound absorbing assembly 22 being detachably mounted on the top of the bracket assembly 1.

Specifically, the sound absorbing assembly 2 in this embodiment includes a plurality of side sound absorbing assemblies 21 vertically disposed at the sides of the bracket assembly 1 and a top sound absorbing assembly 22 horizontally disposed at the top of the bracket assembly 1, and the number of top sound absorbing assemblies 22 in this embodiment may be plural or one according to the actual installation size.

According to the utility model, the side sound absorption assemblies 21 and the top sound absorption assembly 22 are arranged at the side part and the top part of the bracket assembly 1 to form the accommodating cavity capable of covering the sound source equipment, and the accommodating cavity is arranged on the frame 3 to form a sealed structure, so that noise generated by the sound source equipment can be effectively absorbed from the source, the radiation of the noise to the outside is reduced, and the driving noise of a cab and the outside of the vehicle is reduced, thereby improving the comfort level of an operator in using engineering machinery, and meanwhile, the detachable top sound absorption assembly 22 is arranged, so that the sound source equipment in the accommodating cavity is convenient to install and overhaul.

In one embodiment, the side sound absorbing assembly 21 includes a first sound absorbing assembly 211 and a second sound absorbing assembly 212, the plurality of first sound absorbing assemblies 211 are fixedly mounted on the side of the bracket assembly 1 in sequence, the second sound absorbing assembly 212 is fixedly mounted on the side of the bracket assembly 1, the top sound absorbing assembly 22 is positioned on top of the first sound absorbing assembly 211 and the second sound absorbing assembly 212, and a containing cavity is defined between the first sound absorbing assembly 211, the second sound absorbing assembly 212 and the top sound absorbing assembly 22.

Specifically, in this embodiment, the number of the first sound absorbing members 211 is three, two first sound absorbing members 211 are symmetrically disposed on the side of the bracket assembly 1, and the second sound absorbing member 212 is disposed between the two symmetrically disposed first sound absorbing members 211, and the top sound absorbing member 22 is disposed at the top positions of the first sound absorbing member 211 and the second sound absorbing member 212.

In one embodiment, as shown in fig. 3, the first sound absorbing assembly 211 includes a first plate body 2111 and a first sound absorbing layer 2112. The first plate 2111 is fixedly mounted to the bracket assembly 1. The first sound absorbing layer 2112 is fixedly installed at a side of the first plate body 2111 facing the receiving chamber.

In this embodiment, the first plate body 2111 may be fixedly connected to the bracket assembly 1 by using a bolt, or may be connected to the bracket assembly 1 by welding, in this embodiment, preferably, the first plate body 2111 is fixedly mounted on the bracket assembly 1 by using a bolt, and mounting holes are formed at positions corresponding to the first plate body 2111 and the bracket assembly 1.

In this embodiment, the first sound absorbing layer 2112 is disposed inside the first plate 2111, i.e., toward the side of the sound source device, and when the first sound absorbing layer 2112 is mounted, the portion of the first plate 2111 to which the bracket assembly 1 is connected is required to be avoided. It will be appreciated that the first sound absorbing layer 2112 may be as fully covered on the inside of the first plate 2111 as possible to obtain the best sound absorbing effect.

According to the utility model, the first sound absorbing layer 2112 is arranged on the inner side of the first plate body 2111, when noise generated by sound source equipment is transmitted into the surface of the first sound absorbing layer 2112, part of the noise is reflected, and the other part of the noise rubs with surrounding media when the noise propagates in the first sound absorbing layer 2112, so that acoustic energy is lost, and the noise is reduced from radiating to the outside of the first plate body 2111.

In one embodiment, the first sound absorbing assembly 211 further includes a first fixing member 2113 and a first batten 2114, the plurality of first fixing members 2113 are fixedly mounted on the first plate body 2111, the first batten 2114 is connected to the first fixing member 2113, and the first sound absorbing layer 2112 is located between the first batten 2114 and the first plate body 2111.

Specifically, in this embodiment, a plurality of first fixing members 2113 are disposed on the inner side of the first plate body 2111, and a first pressing strip 2114 is connected to the first fixing members 2113, and the first pressing strip 2114 is used for limiting the first sound-absorbing layer 2112, so as to press the first sound-absorbing layer 2112 onto the first plate body 2111. In this embodiment, the first batten 2114 is strip-shaped, the first fixing member 2113 is substantially bump-shaped, and the first sound absorbing layer 2112 is plate-shaped. Each first fixing member 2113 is provided beside the corresponding first sound-absorbing layer 2112 or in the middle of the corresponding first sound-absorbing layer 2112 (that is, the first sound-absorbing layer 2112 is provided with a hole corresponding to the first fixing member 2113). Each first sound-absorbing layer 2112 is provided with two corresponding first fixing members 2113, and one corresponding first batten 2114 is provided. Two first fixing members 2113 corresponding to the same first sound-absorbing layer 2112 are provided at substantially opposite corners of the first sound-absorbing layer 2112. One end of each first batten 2114 is connected to one first fixing member 2113, and the other end is connected to the other first fixing member 2113, so that the first batten 2114 spans the corresponding first sound absorbing layer 2112 and retains the first sound absorbing layer 2112 on the inner side of the first plate body 2111.

In the present embodiment, two corresponding first fixing members 2113 are provided for each first sound-absorbing layer 2112, and one corresponding first pressing bar 2114 is provided, but it is also possible to provide more than two first fixing members 2113 and more than one first pressing bar 2114 for each first sound-absorbing layer 2112 according to actual needs. The position of the first fixing member 2113 may be adjusted, and if necessary, the adjacent first sound absorbing layers 2112 may share the first fixing member 2113, and the first fixing member 2113 may be provided at a position where the first sound absorbing layers 2112 are easily fixed.

According to the utility model, the first fixing piece 2113 and the first pressing strip 2114 are arranged on the first sound absorbing assembly 211, so that the first sound absorbing layer 2112 arranged on the plate body can be fixed, the first sound absorbing layer 2112 is more stably arranged, the first sound absorbing layer 2112 is prevented from loosening and falling due to vibration and the like generated in the working process of engineering machinery, and the noise absorption and blocking effects are ensured.

In one embodiment, as shown in fig. 6 and 7, the second sound absorbing assembly 212 includes a second plate 2121 and a second sound absorbing layer 2123, the second plate 2121 is fixedly mounted on the bracket assembly 1, the second plate 2121 is provided with heat dissipating holes 2122, and the second sound absorbing layer 2123 is fixedly mounted on the second plate 2121 at a side facing the receiving chamber.

Specifically, in this embodiment, the second plate 2121 may be fixedly connected to the bracket assembly 1 by using a bolt, or be connected to the bracket assembly 1 by using a welding method, and in this embodiment, the second plate 2121 is preferably connected to the bracket assembly 1 by using a bolt, and mounting holes are formed at positions corresponding to the second plate 2121 and the bracket assembly 1, and the second plate 2121 is fixedly mounted on the bracket assembly 1 by using a bolt.

In this embodiment, the second sound absorbing layer 2123 is disposed inside the second plate 2121, i.e. towards one side of the sound source device, and when the second sound absorbing layer 2123 is mounted, the portion of the second plate 2121 connected to the bracket assembly 1 needs to be avoided. It will be appreciated that the second sound absorbing layer 2123 may be as fully covered on the inside of the second plate 2121 as possible to obtain the best sound absorbing effect.

In this embodiment, the second sound absorbing assembly 212 is disposed in a direction toward the running direction of the construction machine, and when the construction machine is running, external air can be introduced into the accommodating chamber through the heat dissipation holes 2122 to reduce the temperature in the accommodating chamber.

In one embodiment, as shown in fig. 7, the second sound absorbing assembly 212 further includes a second fixing member 2124 and a second batten 2125, wherein a plurality of second fixing members 2124 are fixedly mounted on the second plate 2121, the second batten 2125 is connected to the second fixing member 2124, and the second sound absorbing layer 2123 is located between the second batten 2125 and the second plate 2121.

Specifically, in this embodiment, a plurality of second fixing members 2124 are disposed on the inner side of the second plate 2121, and a second pressing strip 2125 is connected to the second fixing members 2124, where the second pressing strip 2125 is used for limiting the second sound absorbing layer 2123 and pressing the second sound absorbing layer 2123 onto the second plate 2121. In this embodiment, the second compression bar 2125 is in a strip shape, the second fixing member 2124 is in a bump shape, and the second sound absorbing layer 2123 is in a plate shape. The second sound absorbing layer 2123 is provided with two corresponding second fixing members 2124 and one corresponding second pressing bar 2125. Two second fasteners 2124 are disposed generally diagonally to the second sound absorbing layer 2123. One end of the second batten 2125 is connected to one second fixing member 2124, and the other end is connected to the other second fixing member 2124, so that the second batten 2125 spans the corresponding second sound absorbing layer 2123 and limits the second sound absorbing layer 2123 on the inner side of the second plate body 2121.

In this embodiment, more than two second fixing members 2124 and more than one second pressing bar 2125 may be provided for each second sound absorbing layer 2123 according to actual needs. Also, the position of the second mount 2124 can be adjusted.

According to the utility model, the second sound absorbing layer 2123 is arranged on the inner side of the second plate 2121, when noise generated by sound source equipment is transmitted into the surface of the second sound absorbing layer 2123, part of the noise is reflected, and the other part of the noise rubs with surrounding medium when being transmitted in the second sound absorbing layer 2123, so that acoustic energy is lost, and the noise is reduced from radiating to the outside of the second plate 2121.

In one embodiment, as shown in fig. 4, the top sound absorbing assembly 22 includes a top plate 221 and a top sound absorbing layer 222, the top plate 221 is detachably mounted on the bracket assembly 1, and the top sound absorbing layer 222 is fixedly mounted on the top plate 221 at a side facing the receiving chamber.

Specifically, the top plate 221 is fixedly connected with the bracket assembly 1, or is connected with the bracket assembly 1 by adopting a welding mode, and in this embodiment, the bolt connection is preferably adopted, mounting holes are formed at positions corresponding to the second plate 2121 and the bracket assembly 1, and the second plate 2121 is fixedly mounted on the bracket assembly 1 through bolts.

In this embodiment, the top sound absorbing layer 222 is disposed inside the top plate 221, i.e. towards one side of the sound source device, and when the top sound absorbing layer 222 is installed, the portion where the top plate 221 is connected to the bracket assembly 1 needs to be avoided. It will be appreciated that the top sound absorbing layer 222 may be as full as possible on the inside of the top plate 221 to obtain the best sound absorbing effect.

According to the utility model, the top sound absorbing layer 222 is arranged on the inner side of the top plate 221, when noise generated by sound source equipment is transmitted into the surface of the top sound absorbing layer 222, part of the noise is reflected, and the other part of the noise rubs with surrounding media when the noise propagates in the top sound absorbing layer 222, so that acoustic energy is lost, and the noise is reduced from radiating to the outside of the top plate 221.

In one embodiment, as shown in fig. 4 and 5, the top sound absorbing assembly 22 further includes a lock catch 223, a top fixing member 224 and a top pressing bar 225, wherein the lock catch 223 is fixedly mounted on the top plate 221 on a side facing the bracket assembly 1, the lock catch 223 is adapted to be detachably connected with the bracket assembly 1, the plurality of top fixing members 224 are fixedly mounted on the top plate 221, the top pressing bar 225 is connected with the top fixing member 224, and the top sound absorbing layer 222 is located between the top pressing bar 225 and the top plate 221.

Specifically, in this embodiment, a plurality of top fixing members 224 are disposed inside the top plate 221, and a top pressing bar 225 is connected to the top fixing members 224, where the top pressing bar 225 is used for limiting the top sound absorbing layer 222 and pressing the top sound absorbing layer 222 onto the top plate 221. In this embodiment, the top bead 225 is strip-shaped, the top fixing member 224 is substantially bump-shaped, and the top sound absorbing layer 222 is plate-shaped. The plurality of top fasteners 224 are disposed at the edge of the top sound absorbing layer 222 and at the middle of the top sound absorbing layer 222 (i.e., holes corresponding to the top fasteners 224 are formed in the top sound absorbing layer 222). A "well" structure is formed between the plurality of top fixtures 224 and the corresponding top molding 225, limiting the top sound absorbing layer 222 to the inside of the top plate 221. In this embodiment, the position of the top mount 224 may also be adjusted.

In this embodiment, two latches 223 are symmetrically installed at the inner side of the top plate 221 and located at the opposite sides near the edge of the top plate 221, and elastic lock bolts are movably arranged in the latches 223 and can be clamped at the top of the bracket assembly 1, when the top sound absorbing assembly 22 needs to be disassembled, the elastic lock bolts are pulled to be separated from the bracket assembly 1, so that the top sound absorbing assembly 22 can be disassembled from the top of the bracket assembly 1.

The lock catch 223 which can be detached from the bracket component 1 is arranged on the top plate 221, so that the top plate 221 can be detached to mount and overhaul the sound source equipment in the accommodating cavity, and the utility model has the advantages of simple structure and convenient operation; the top fixing piece 224 and the top pressing bar 225 on the top plate 221 can play a fixed role on the top sound absorbing layer 222 installed on the top plate 221, so that the top sound absorbing layer 222 is installed more firmly, the top sound absorbing layer 222 is prevented from loosening and falling off due to vibration and the like generated in the working process of engineering machinery, and the noise absorption and blocking effects are guaranteed.

In one embodiment, as shown in fig. 2, the bracket assembly 1 includes a plurality of columns 11 and a plurality of beams 12, one end of the columns 11 being adapted to be connected to the frame 3, and the other end being connected to the beams 12, and the sound absorbing assembly 2 being mounted on the columns 11 and the beams 12.

Specifically, in this embodiment, the upright 11 is vertically disposed on the frame 3, the bottom of the upright 11 is fixedly connected with the frame 3, the top is fixedly connected with the cross beam 12, the first sound absorbing assembly 211 and the second sound absorbing assembly 212 are fixedly mounted on the upright 11, and the top sound absorbing assembly 22 is mounted on the cross beam 12.

In this embodiment, the upright 11 includes two first uprights 111 and second uprights 112, the number of the first uprights 111 is two, the number of the second uprights 112 is at least two, the second uprights 112 are symmetrically arranged, and the second uprights 112 are disposed in a direction facing the running direction of the construction machine relative to the first uprights 111, more specifically, the number of the second uprights 112 is six in this embodiment.

In this embodiment, the cross beam 12 includes two first beams 121 and two second beams 122, the number of the first beams 121 is two, the first columns 111 and the second columns 112 are connected to one side, the number of the second beams 122 is at least two, the two first columns 111 and the two second columns 112 are respectively connected, more specifically, the number of the second beams 122 is three in this embodiment, the two second beams 122 are respectively connected to the ends of the two first columns 111 and the two first beams 121, the other second beam 122 is disposed at the middle position of the two first beams 121, and the first columns 111, the second columns 112, the first beams 121 and the second beams 122 are combined into a frame with a cuboid structure.

In this embodiment, to meet the requirement of the installation structure of the body of the construction machine, a third upright 113 and a third beam 123 are further provided, the size of the third upright 113 is smaller than that of the first upright 111 and the second upright 112, the size of the third beam 123 is smaller than that of the first beam 121, and the third upright 113 and the third beam 123 are disposed on one side of the bracket assembly 1 facing the formation direction of the construction machine, so that the bracket assembly becomes a specific stepped three-dimensional frame.

In this embodiment, the top sound absorbing assembly 22 includes two third sound absorbing assemblies 2 and one fourth sound absorbing assembly 2, which are detachably mounted on the top of the bracket assembly 1, and two second sound absorbing assemblies 212 are also provided and fixedly mounted on one side of the bracket assembly 1 facing the running direction of the engineering machine.

In this embodiment, the bracket assembly 1 may be bolted or welded, and in this embodiment, it is preferable that the bracket assembly be bolted.

In this embodiment, the second fixing members 2124 are provided on the first upright 111 and the cross member 12, and the mounting holes in which the first sound absorbing member 211 and the second sound absorbing member 212 can be mounted by bolts are provided on the second fixing members 2124, the second upright 112, the third upright 113, the second beam 122, and the third beam 123.

In this embodiment, the upright 11 and the frame 3 may be connected by bolts or welding.

In this embodiment, the bracket component 1 is made of aluminum alloy profiles, wherein the first upright 111, the second upright 112 and the third upright 113 can be made of semi-open upright, U-shaped upright or door-shaped upright, and specifically can be made of square steel, L-shaped angle steel, channel steel and other shaped steel; the first, second and third beams 121, 122 and 123 may be made of square steel; the first fixing member 2113, the second fixing member 2124 and the top fixing member 224 may be made of channel steel or square steel with smaller size, and mounting holes are formed in the first fixing member 2113, the second fixing member 2124 and the top fixing member 224; the first bead 2114 and the top bead 225 may be flat steel made of aluminum alloy.

In this embodiment, the first plate body 2111, the second plate body 2121 and the top plate 221 may be made of aluminum alloy plates 1mm to 3mm thick, and the bracket assembly 1 and the sound absorbing assembly 2 may be made of aluminum alloy to reduce the weight of the acoustic bag structure.

In this embodiment, as shown in fig. 8, the first sound absorbing member 211 and the top sound absorbing member 22 include a sound absorbing layer 231, an adhesive layer 232, and a separation layer 233, and the sound absorbing layer 231 may be made of sound absorbing cotton, specifically, the sound absorbing cotton includes at least one of Polyurethane (PU), melamine, glass fiber cotton, and two-component cotton. In this embodiment, different sound absorbing cotton can be adhered according to the spectrum characteristics of different sound devices such as engines and gearboxes, so as to satisfy the noise absorption of different frequencies.

The adhesive layer is double-sided tape, and the separation layer 233 is a separation paper, which is removed when the sound absorbing assembly 2 is attached, and the double-sided tape is attached to the first plate body 2111 and the top plate 221. In this embodiment, the thickness of the sound absorbing cotton is set to 10mm to 30mm.

In one embodiment, when the frequency of the main noise source of the engine and the gearbox is between 1000 and 3000Hz, the sound-absorbing cotton adopts a double-component sound-absorbing cotton with the thickness of 10 to 30mm, the sound-absorbing cotton has good sound-absorbing effect on medium and high frequency noise above 1500Hz, the sound-absorbing cotton adopts polyester fiber and has good sound-absorbing effect on noise below 1500Hz, and one or two sound-absorbing materials can be selected to be combined to form a plurality of sound-absorbing layers.

In another embodiment, when the frequency of the main noise source of the engine and the gearbox is between 1000-3000 Hz, the sound absorbing cotton can also adopt Polyurethane (PU) with the thickness of 10-30 mm, the sound absorbing effect on medium and high frequency noise above 500Hz is good, the sound absorbing cotton with the thickness of 10-30 mm is good on the sound absorbing effect on medium and high frequency noise above 1500Hz, and two sound absorbing materials with different thicknesses can be selected for combination matching in the embodiment.

According to the utility model, the upright posts 11 and the cross beams 12 are combined into the frame structure, so that the sound absorbing assembly 2 arranged on the bracket assembly 1 can be fixed and supported, and the sound absorbing assembly 2 is more firmly arranged.

According to an embodiment of the present utility model, in another aspect, there is also provided an engineering machine including a frame 3, an acoustic bag structure fixedly mounted on the frame 3, a receiving cavity facing the frame 3, and a sound source device fixedly mounted on the frame 3 and located in the receiving cavity.

Specifically, in this embodiment, the acoustic bag structure is mounted at the front end of the frame 3, and is used as an engine room of a construction machine, and the sound source device includes an engine, a gearbox, a fan, etc., and when in operation, medium-high frequency noise of 1000Hz or more is generated. In other embodiments, the acoustic bag structure may also be used as an acoustic bag for a motor or exhaust system, air conditioning system, etc. in a work machine.

According to the utility model, the sound source device is arranged in the accommodating cavity enclosed between the acoustic package structure and the frame 3, the sound absorbing component 2 on the acoustic package structure can absorb and block the noise generated by the sound source device, and the noise radiation can be effectively reduced by absorbing the noise from the source head, so that the driving noise of the cab and the outside of the vehicle is reduced, and the comfort level of an operator in using engineering machinery is improved.

Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.

Claims (10)

1. An acoustic bag structure comprising:

The bracket assembly (1) is suitable for being fixedly arranged on the frame (3);

The sound absorbing assemblies (2) are arranged at the top and the side parts of the bracket assembly (1), a plurality of sound absorbing assemblies (2) are enclosed into a containing cavity, the containing cavity is suitable for installing sound source equipment, and the bottom of the sound absorbing assemblies (2) arranged at the side parts of the bracket assembly (1) is suitable for being abutted to the frame (3).

2. The acoustic bag structure according to claim 1, characterized in that the sound absorbing assembly (2) comprises:

A plurality of side sound absorbing members (21) fixedly installed at the sides of the bracket member (1);

And the top sound absorbing assembly (22) is detachably arranged on the top of the bracket assembly (1).

3. The acoustic bag structure according to claim 2, characterized in that the side sound absorbing assembly (21) comprises:

the plurality of first sound absorption assemblies (211) are sequentially and fixedly arranged on the side part of the bracket assembly (1);

The second sound subassembly (212) of inhaling, fixed mounting is in bracket component (1) lateral part, top inhale sound subassembly (22) are located first inhale sound subassembly (211) with second inhale sound subassembly (212) top, first inhale sound subassembly (211), second inhale sound subassembly (212) with top inhale and enclose between the sound subassembly (22) and become the chamber holds.

4. An acoustic bag structure according to claim 3, wherein the first sound absorbing assembly (211) comprises:

A first plate body (2111) fixedly mounted on the bracket assembly (1);

And a first sound absorbing layer (2112) fixedly installed on the first plate body (2111) at a side facing the accommodating cavity.

5. The acoustic bag structure of claim 4, wherein the first sound absorbing assembly (211) further comprises:

A plurality of first fixing members (2113) fixedly mounted on the first plate body (2111);

and a first pressing strip (2114) connected with the first fixing piece (2113), wherein the first sound absorbing layer (2112) is positioned between the first pressing strip (2114) and the first plate body (2111).

6. An acoustic bag structure according to claim 3, wherein the second sound absorbing assembly (212) comprises:

The second plate body (2121) is fixedly arranged on the bracket assembly (1), and a radiating hole (2122) is formed in the second plate body (2121);

and a second sound absorbing layer (2123) fixedly installed on the second plate body (2121) at a side facing the accommodating chamber.

7. The acoustic bag structure of claim 6 wherein the top sound absorbing assembly (22) comprises:

A top plate (221) detachably mounted on the bracket assembly (1);

And a top sound absorbing layer (222) fixedly installed on the top plate (221) at a side facing the accommodating cavity.

8. The acoustic bag structure of claim 7 wherein the top sound absorbing assembly (22) further comprises:

A lock catch (223) fixedly arranged on the top plate (221) and positioned on one side facing the bracket assembly (1), wherein the lock catch (223) is suitable for being detachably connected with the bracket assembly (1);

A plurality of top fixtures (224) fixedly mounted on the top plate (221);

And a top pressing strip (225) connected with the top fixing piece (224), wherein the top sound absorbing layer (222) is positioned between the top pressing strip (225) and the top plate (221).

9. The acoustic bag structure according to any one of claims 1 to 8, wherein the bracket assembly (1) comprises:

A plurality of upright posts (11), wherein one end of each upright post (11) is suitable for being connected with the frame (3);

The beams (12) are connected with the other ends of the upright posts (11), and the sound absorbing assembly (2) is installed on the upright posts (11) and the beams (12).

10. A construction machine, comprising:

A frame (3);

The acoustic bag structure of any one of claims 1 to 9, fixedly mounted on said frame (3), said receiving cavity being oriented towards said frame (3);

The sound source device is fixedly arranged on the frame (3) and is positioned in the accommodating cavity.