WO2022048189A1

WO2022048189A1 - Mute test system

Info

Publication number: WO2022048189A1
Application number: PCT/CN2021/094752
Authority: WO
Inventors: 周良宏
Original assignee: 苏州拓朴声学科技有限公司
Priority date: 2020-09-01
Filing date: 2021-05-20
Publication date: 2022-03-10
Also published as: CN111964938A

Abstract

A mute test system, comprising a mute test box, a noise measurement device, a feeding device (11), and a control system. The mute test box comprises an inner layer sound insulating box body (1), an outer layer sound insulating box body (2), and a vibration damping device (3). Each of the inner layer sound insulating box body (1) and the outer layer sound insulating box body (2) is provided with a sound insulating door (4), sound leakage preventing wire passing box (5), and an access door (6). A lifting device (7) is provided on the inner side of the sound insulating door (4) of the inner layer sound insulating box body (1). A pressing device (8) is provided on the outer side of the sound insulating door (4) of the outer layer sound insulating box body (2). A sound absorbing device (9) is further provided in the inner layer sound insulating box body (1). The noise measurement device is used for detecting audio data of a test product in the mute test box. The feeding device (11) can move into or out from the mute test box to pick up or place a test product. The control system is electrically connected to the mute test box, the noise measurement device, and the feeding device (11) to contorl the entire system to operate. The mute test system can provide a mute test box that provides a detection environment having ultra-low noise and a perfect test system.

Description

A silent test system

technical field

The invention relates to the field of mute testing, in particular to a mute testing system.

Background technique

The mute test box is also called sound insulation box and sound shielding box. It is a kind of equipment used to meet the low noise environment requirements of audio frequency testing. The mute test box is an isolation cavity made of sound absorption, damping, sound insulation and vibration reduction materials. , to provide a low-noise detection environment far lower than ambient noise for product noise detection, and the requirements for acoustic performance indicators are high.

At present, there are more and more test items and higher test indicators for testing products. The traditional silent test box has the following shortcomings:

1. The noise floor value is relatively high, and it is difficult to be lower than 20 decibels; it is difficult to meet the requirements of a low-noise test environment;

2. The actual sound insulation of the sound insulation door is often much lower than the theoretical sound insulation.

3. The door is basically opened manually. Because the sound insulation door is relatively heavy and needs to be tightly sealed, for the high-frequency inspection of the production line, this labor-saving method is easy to cause operator fatigue. inconvenient to use;

4. The low noise background is extremely sensitive to vibration, and the imperfect matching of the vibration reduction system greatly affects the noise floor value inside the box.

5. Since the test equipment is installed in the silent test box, the test equipment needs to be powered on or operated with ventilation, so it is necessary to open through holes for threading and pipe penetration in the silent test box, and the sound will spread out from the through holes;

6. Due to size limitations, it is difficult to install materials with a wide-band sound absorption coefficient (especially low-frequency bands) inside the box, which will easily lead to relatively large low-frequency reverberation sound energy inside the box. The low frequency band is very prone to the standing wave phenomenon, which causes the test data to deviate from the objective reality and fail.

7. Since the interior of the silent box is generally relatively deep, and in order to ensure the sound insulation effect, the door opening is generally set smaller, and it is inconvenient for the tester to repeatedly replace the test product;

In order to overcome the above shortcomings, there is an urgent need for a quiet test box and a perfect quiet test system that can provide an ultra-low noise detection environment.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a mute test system, which can provide a mute test box and a perfect test system with an ultra-low background noise detection environment.

In order to solve the above technical problems, the present invention provides a silent test system, which is characterized in that it includes a silent test box, a noise measurement device, a feeding device and a control system;

The mute test box includes an inner sound insulation box, an outer sound insulation box and a vibration damping device, and both the inner sound insulation box and the outer sound insulation box are provided with sound insulation doors and anti-leakage sound insulation. A junction box and an inspection door, an automatic lifting device is arranged on the inner side of the sound insulation door of the inner sound insulation box, a pressing device is arranged on the outer side of the sound insulation door of the outer sound insulation box, and the inner sound insulation box is provided with an automatic lifting device. The sound box body is also provided with a sound absorption device with a special structure;

The noise measuring device is used to detect the audio data of the test product in the silent test box;

The feeding device can enter and exit the silent test box for picking and placing test products;

The control system is electrically connected with the silent test box, the noise measuring device and the feeding device, and is used for controlling the work of the whole system.

In a preferred embodiment of the present invention, the vibration damping device further includes a plurality of medium and high frequency vibration dampers arranged between the inner sound insulation box and the outer sound insulation box, and a plurality of medium and high frequency vibration dampers arranged between the outer sound insulation box and the outer sound insulation box. The lower load-bearing bracket and a plurality of low frequency shock absorbers; a plurality of the medium and high frequency shock absorbers are distributed in a rectangular array between the inner sound insulation box and the outer sound insulation box, and a plurality of the low frequency shock absorbers are arranged At the four corners of the load-bearing bracket, limit blocks are arranged on the load-bearing bracket, the limit blocks are protruded upward and arranged on the edge of the load-bearing bracket, and the limit blocks limit the position of the outer sound insulation box.

In a preferred embodiment of the present invention, it further includes that the anti-leakage sound-insulating box is inserted through the side walls of the inner-layer sound-insulating box body and the outer-layer sound-insulating box body, and is used to penetrate into the mute test box. The required pipelines include the inner sound insulation box, the fixing frame outside the outer sound insulation box, and the wire-passing combination module embedded in the inner sound insulation box and the outer sound insulation box. The outer side of the wire combination module is provided with a protrusion protruding from the inner sound insulation box and the outer sound insulation box, the fixing frame is sleeved on the protrusion, and the wire combination module includes at least two layers For the wire-passing sub-modules set in the mold clamping, the multi-layer wire-passing sub-modules are connected by bolt locking, and a wire-passing hole is opened on the center line of the adjacent two-layer wire-passing sub-modules after the molds are closed. Matching with the required pipeline clearance, maintenance is convenient.

In a preferred embodiment of the present invention, the lifting device further includes a first rotating support assembly disposed on the sound insulation door of the inner sound insulation box and a second rotating support assembly disposed on the inner sound insulation box , the first rotating support assembly includes a first support base and a first rotating head, the second rotating support assembly includes a second support base and a second rotating head, and the space between the first rotating head and the second rotating head A telescopic cylinder is provided, and the telescopic cylinder drives the sound insulation door to open or close. When the sound insulation door is in a closed state, the telescopic cylinder drives the sound insulation door to continue to apply pressure to the direction of the inner sound insulation box, and the sound insulation door is closed. Press down on the inner sound insulation box.

In a preferred embodiment of the present invention, the pressing device further includes a fixed pressing block arranged on the side of the sound insulation door of the outer sound insulation box and a pressing component arranged on the outer sound insulation box. The tightening assembly includes a pressing cylinder, a door tongue pressing block and a door tongue fixing support, the door tongue fixing support is arranged on the outer sound insulation box, and the door tongue pressing block is hinged on the door tongue and fixed by a pivot. On the support, the door tongue pressing block on one side of the pivot is pressed against the fixed pressing block, and the door tongue pressing block on the other side of the pivot is connected with the pressing cylinder, and the pressing cylinder drives the door tongue pressing. The block moves toward or away from the fixed pressure block to realize the opening and closing action of the door tongue pressure block. When the door tongue pressure block is in the closed state, the pressing cylinder drives the door tongue pressure block to continue to apply pressure to the fixed pressure block. pressure, and press the door tongue pressure block to the fixed pressure block.

In a preferred embodiment of the present invention, the sound absorbing device further includes a metal plate arranged in the inner sound insulation box, the metal plate is arranged on the inner walls of the six sides of the inner sound insulation box, any The metal plates on the two adjacent surfaces are spliced together, the metal plates on the six surfaces are spliced to form a metal plate cavity, the metal plates are provided with a number of through holes penetrating the metal plates, and the metal plates are sound-insulated from the inner layer. A filling layer of sound absorbing material is arranged between the inner walls of the box body.

In a preferred embodiment of the present invention, the noise measurement device further includes a MIC sound sensor and a sound level meter, the MIC sound sensor is arranged in a silent test box, the sound level meter is arranged in the control system, and the noise measurement The device can identify various weighted sound pressure levels, sound spectrums, and sound pressure amplitudes of the test product.

In a preferred embodiment of the present invention, it further includes that the feeding device is disposed in the silent test box, the feeding device includes a fixed base, a sliding device is provided on the fixed base, and the sliding device includes a fixed base disposed on the fixed base. The slide rail, the pneumatic slider matched with the slide rail, and the sliding platform arranged on the pneumatic slider, the sliding platform is provided with a secondary push-out device, and the secondary push-out device includes a push source and an experimental A test bench is provided with a product limiting fixture on the experimental test bench.

In a preferred embodiment of the present invention, the control system further includes an industrial control box and an industrial control display screen, and the industrial control box includes a computer host, a capture card, a sound level meter, an electrical control switch, a solenoid valve, a cooling fan, and a control button. The control box integrates the control of the cylinder action of the entire test system, the processing of the cylinder induction signal; the acquisition, output, data operation, data analysis, identification and judgment, and storage of the acoustic measurement signal.

In a preferred embodiment of the present invention, a monitoring camera and a lighting fixture are further provided in the silent test box.

Beneficial effects of the present invention:

The present invention adopts the sound insulation boxes arranged inside and outside to form the main sound insulation structure of the mute test box together, and the structure can effectively control the air sound transmission;

The vibration noise of different frequencies is reduced by the vibration damping device, the vibration noise from the solid body in the silent test box is reduced, and the sound environment quality in the silent test box is improved;

Through the anti-leakage sound passage box, the threading and pipe threading in the silent test box can be realized, and the acoustic airtightness of threading and piping can be satisfied at the same time, and it has good sound insulation performance;

The sound insulation door is pressed against the inner sound insulation box and the outer sound insulation box by the lifting device and the pressing device respectively, so as to ensure the gap between the sound insulation door and the inner sound insulation box and the outer sound insulation box. It is in the ultimate compression state to ensure that there is no gap between the sound insulation door and the mute test box, and the sound insulation effect is improved;

Reduce the generation of reflected sound energy through the sound absorption device, control the reverberation sound energy in the box within a certain reasonable range, and avoid the impact of the reverberation sound in the test box on the objective value of the test data;

Through the double-layer main body sound insulation structure, vibration damping device, anti-leakage sound junction box, lifting device, pressing device, and sound absorption device, the sound insulation effect is comprehensively improved from the control of noise generation, noise transmission path, and noise transmission path, providing An ultra-low noise detection environment is developed.

Through the feeding device, the in-and-out motion of the experimental test bench in the silent test box is realized, the automatic expansion and contraction function of the test test bench is realized, and it is convenient to take and place the test product from the silent test box.

The mute test system of the present invention is further provided with a noise measuring device in the mute test box, and a control system electrically connected with all devices in the mute test box is arranged outside the mute test box, so as to realize the operation and control of the whole mute test system.

Description of drawings

Fig. 1 is the overall side structure schematic diagram of the mute test system of the present invention;

Fig. 2 is the overall top view structure schematic diagram of the mute test box of the present invention

Fig. 3 is the structural representation of the vibration damping device of the present invention;

Fig. 4 is the structural representation of the leak-proof sound-passing junction box of the present invention;

Fig. 5 is the structural representation of the lifting device of the present invention;

Fig. 6 is the structural representation of the pressing device of the present invention;

Fig. 7 is the structural representation of the sound absorption device of the present invention;

FIG. 8 is a schematic structural diagram of the feeding device of the present invention.

Description of the symbols in the figure: 1. Inner sound insulation box; 2. Outer sound insulation box; 3. Vibration damping device; 301, Medium and high frequency shock absorber; , limit block; 4, sound insulation door; 5, anti-leakage sound passing box; 501, fixed frame; 502, wire passing sub-module; 503, wire passing hole; 504, fixing bolt; 505, connecting bolt; 6, Access door; 7. Lifting device; 701, First rotating support assembly; 702, Second rotating support assembly; 703, Telescopic cylinder; 8. Pressing device; 801, Fixed pressing block; 802, Pressing cylinder; Tongue pressing block; 804, door tongue fixing support; 805, handle; 9, sound absorption device; 901, metal plate; 902, sound absorption material filling layer; 10, MIC sound control sensor; 11, feeding device; 1101, fixed base ;1102, slide rail; 1103, pneumatic slider; 1104, sliding platform; 1105, push source; 1106, experimental test bench; 1107, limit slot; 1108, fixed limit block; 1109, limit cylinder; 1110, slide Limit block; 12, industrial control box; 13, industrial control display screen; 14, surveillance camera; 15, lighting fixtures; 16, three-color signal indicator.

detailed description

The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

1-2, an embodiment of the mute test system of the present invention, a mute test system, includes a mute test box, a noise measurement device, a feeding device 11 and a control system;

The mute test box includes an inner sound insulation box 1, an outer sound insulation box 2 and a vibration damping device 3. Both the inner sound insulation box 1 and the outer sound insulation box 2 are provided with sound insulation. Door 4, anti-leakage and sound-proof junction box 5, inspection door 6, a lifting device 7 is provided inside the sound-insulating door 4 of the inner sound-insulating box 1, and the sound-insulating door 4 of the outer sound-insulating box 2 is provided with a lifting device 7. A pressing device 8 is arranged on the outside, and a sound absorbing device 9 is also arranged in the inner sound insulation box 1 .

Referring to FIG. 3 , the vibration damping device 3 includes a plurality of medium and high frequency vibration dampers 301 arranged between the inner sound insulation box 1 and the outer sound insulation box 2 , and a plurality of medium and high frequency vibration dampers 301 arranged between the outer sound insulation box 2 . The lower load-bearing bracket 302 and a plurality of low-frequency shock absorbers 303 are combined to reduce vibration and noise of different frequencies, reduce vibration and noise from solid transmission in the silent test box, and improve the acoustic environment quality in the silent test box.

In order to ensure the stability of the support and at the same time ensure that the force of each medium and high frequency shock absorber 301 is uniform, a plurality of the middle and high frequency shock absorbers 301 are distributed in a rectangular array in the inner sound insulation box 1 and the outer sound insulation box Between 2 and 2, the medium and high frequency shock absorber 301 is a rubber damping shock absorber, and the rubber damping shock absorber has high elasticity and viscoelasticity; compared with the steel material, the elastic deformation of rubber is very large, and the elastic modulus is very large. Small; the impact stiffness of rubber is greater than the dynamic stiffness, and the dynamic stiffness is greater than the static stiffness, which is conducive to reducing impact deformation and dynamic deformation; therefore, the rubber damping shock absorber can effectively reduce medium and high frequency vibration noise.

In order to ensure the stability of the support, a plurality of the low-frequency shock absorbers 303 are arranged at the four corners of the load-bearing bracket 302, and the low-frequency shock absorbers 303 are spring composite damping shock absorbers, and the spring composite damping shock absorbers Also known as prestressed spring shock absorber, it has the dual advantages of low frequency and large damping, eliminating the inherent resonance amplitude phenomenon of the spring.

In order to limit the position of the silent test box on the load-bearing bracket 302 , a limit block 304 is provided on the load-bearing bracket 302 , and the limit block 304 protrudes upward and is disposed on the edge of the load-bearing bracket 302 to prevent the silent test box from moving.

Referring to FIG. 4 , the anti-leakage sound passing box 5 is inserted through the side walls of the inner sound insulation box 1 and the outer sound insulation box 2, and is used to pass through all the holes in the silent test box. The pipeline is required, including the fixing frame 501 arranged on the outer side of the inner sound insulation box 1 and the outer sound insulation box 2, and a wire-passing combination module embedded in the inner sound insulation box 1 and the outer sound insulation box 2, The outer side of the wire-passing combination module is provided with protrusions protruding from the inner sound insulation box 1 and the outer sound insulation box 2, and the fixing frame 201 is sleeved on the protrusions. The combined module includes at least two layers of wire-passing sub-modules 502 arranged in clamping, the multi-layered wire-passing sub-modules 502 are connected by bolt locking, and a centerline of the adjacent two-layer wire-passing sub-modules 502 after clamping is opened. Line hole 503, the line hole 503 is matched with the required pipeline clearance to ensure that the required pipeline passes through the line hole 503, and at the same time, there is no gap between the required pipeline and the line hole 503, so as to meet the requirements of threading and passing through the pipe. Acoustic airtightness and good sound insulation performance.

The fixing frame 501 is fixed to the outside of the inner sound insulation box 1 and the outer sound insulation box 2 through fixing bolts 504, and the fixing frame 501 is detachably connected to the wire-passing combination module through The fixing frame is respectively fixedly connected with the inner sound insulation box 1, the outer sound insulation box 2 and the wire-passing combination module, to limit and fix the position of the wire-passing combination module, and prevent the fixed position of the wire-passing combination module from being relative to the inner layer insulation. The acoustic box body 1 and the outer sound insulation box body 2 slide. The specific installation process of the leak-proof sound-passing box 5 is as follows: firstly, open the two adjacent layers of wire-passing sub-modules 502, and place the required pipelines in the adjacent two. In the wire-passing holes 503 between the wire-passing sub-modules 502, after all the required pipelines are placed, the wire-passing sub-module 502 is clamped and fixed by bolting, and one end of the wire-passing sub-module 502 is inserted into Inside the fixing frame 501, connect and fix the fixing frame 501 with the connecting bolts 505, and then embed the other end of the wire-passing sub-module 502 into the inner sound insulation box 1 and the outer sound insulation box 2, and finally fix the fixing frame. 501 is locked and fixed to the outside of the inner layer sound insulation box 1 and the outer layer sound insulation box 2 by fixing bolts 504 .

Specifically, when setting the wire passage holes 503, the number of wire passage holes 503 is determined according to the number of the pipelines to prevent redundant wire passage holes 503. However, in the actual use process, some equipment in the silent test box It may not need to be used, so there will be redundant wire passage holes 503. At this time, the wire passage sub-module 502 of the clamping mold can be replaced with the wire passage sub-module 502 matching the required number of pipelines, or the redundant wire passage sub-module 502 can be replaced. The expanded sound-absorbing tampon is inserted into the thread hole 503. Since the expanded sound-absorbing tampon has ductility, the expanded sound-absorbing tampon is in an interference fit with the thread hole 503 to ensure that the expanded sound-absorbing tampon can block the thread. hole 503.

Referring to FIG. 5 , the lifting device 7 includes a first rotating support assembly 701 disposed on the sound insulation door 4 of the inner sound insulation box 1 and a second rotating support assembly disposed on the inner sound insulation box 1 702, the first rotating support assembly 701 includes a first support base and a first rotating head, the second rotating support assembly 702 includes a second support base and a second rotating head, the first rotating head and the second rotating head A telescopic cylinder 703 is arranged between the heads, and the telescopic cylinder 703 drives the sound insulation door 4 to open or close. During the closing and opening of the sound insulation door 4, the first rotating support assembly 701 and the second rotating support assembly 702 When the relative position of the sound insulation door 4 changes, through the rotation of the first rotating head and the second rotating head, the angle of the telescopic cylinder 703 changes during the process of changing the position, so as to realize the automatic opening and closing of the sound insulation door 4. When the sound insulation door 4 is in the closed state The telescopic air cylinder 703 drives the sound insulation door 4 to continue to apply pressure in the direction of the inner sound insulation box 1, and presses the sound insulation door 4 to the inner sound insulation box 1, so as to ensure that the sound insulation door 4 is connected to the inner sound insulation box 1. The sound insulation boxes 1 are in a state of extreme compression, which ensures that there is no gap between the sound insulation door 4 and the inner layer sound insulation box 1, and improves the sound insulation effect.

In order to further improve the sealing effect between the sound insulation door 4 and the inner sound insulation box 1, in this embodiment, a sealing strip is arranged between the sound insulation door 4 and the inner sound insulation box 1, and the sealing The strips are arranged on the outer periphery of the inner wall of the sound insulation door 4 or on the inner wall of the inner layer sound insulation box 1 .

Referring to FIG. 6 , the pressing device 8 includes a fixed pressing block 801 arranged on the side of the sound insulation door 4 of the outer sound insulation box 2 and a pressing component arranged on the outer sound insulation box 2 . The tightening assembly includes a pressing cylinder 802, a door tongue pressing block 803 and a door tongue fixing support 804, the door tongue fixing support 804 is arranged on the outer sound insulation box 2, and the door tongue pressing block 803 is hinged through a pivot. On the door tongue fixing support 804 , the door tongue pressing block 803 on one side of the pivot is pressed against the fixed pressing block 801 , the door tongue pressing block 803 on the other side of the pivot and the pressing cylinder 802 connection, the pressing cylinder 802 drives the door tongue pressing block 803 to move in the direction close to or away from the fixed pressing block 801 to realize the opening and closing action of the door tongue pressing block 803. When the door tongue pressing block 803 is in the open state, all the The sound insulation door 4 can be opened relative to the outer sound insulation box 2. When the door tongue pressure block 803 is in a closed state, the pressing cylinder 802 drives the door tongue pressure block 803 to continue to apply pressure to the fixed pressure block 801. Press the door tongue pressing block 803 to the fixed pressing block 801 to ensure that the sound insulation door 4 and the outer sound insulation box 2 are in a state of extreme compression, and ensure that the sound insulation door 4 and the outer sound insulation box 2 are in a state of extreme compression. There are no gaps, which improves the sound insulation effect.

In order to further improve the sealing effect between the sound insulation door 4 and the outer sound insulation box 2, in this embodiment, a sealing strip is arranged between the sound insulation door 4 and the outer sound insulation box 2, and the sealing The strips are arranged on the outer periphery of the inner wall of the sound insulation door 4 or on the outer wall of the outer sound insulation box 2 .

Specifically, a handle 805 is further provided on the outer side of the sound insulation door 4 to facilitate opening or closing of the sound insulation door 4 .

Referring to FIG. 7 , the sound absorption device 9 includes a metal plate 901 arranged in the inner sound insulation box 1 , and the metal plate 901 is arranged on the inner walls of the six surfaces of the inner sound insulation box 1 . The metal plates 901 on two adjacent sides are spliced together, and the metal plates 901 on the six sides are spliced to form a metal plate cavity. A sound-absorbing material filling layer 902 is arranged between the sound-absorbing material and the inner wall of the inner sound-insulating box 1. During the mute test, when the sound is transmitted to the metal plate 901, a part of the sound enters the sound-absorbing material through the through holes on the metal plate 901. In the filling layer 902, the generation of reflected sound energy is reduced, and another part of the sound can also enter the sound-absorbing material filling layer 902 after a single reflection to reduce the generation of repeatedly reflected sound energy, so that the inner layer of the sound insulation box 1 The reverberation sound energy inside is controlled within a certain reasonable range, so as to avoid the influence of the reverberation sound in the inner sound insulation box 1 on the objective value of the test data.

Specifically, in order to build and place the metal plate cavity of this embodiment in the inner sound insulation box 1, a rectangular keel frame is provided in the inner sound insulation box 1, and the rectangular keel frame can The sound insulation box 1 is taken out. The corners of the metal plate 901 are provided with a plurality of perforations for bolts to pass through, and the rectangular keel frame is provided with a plurality of screw holes with matching perforations. The bolts passing through the holes are screwed into the screw holes of the rectangular keel frame and installed on the rectangular keel frame. The metal plate 901 is detachably installed on the rectangular keel frame, and the metal plate can be replaced when different sound absorption effects are required. 901.

Specifically, according to different sound absorption requirements, the perforation rate of the metal plate 901 can be changed between 25% and 75%, and the diameter of the through holes on the metal plate 901 can be changed between 2mm and 4mm. The higher the acoustic requirements, the larger the perforation rate and the through hole diameter.

In order to prevent the metal plate 901 from corroding during long-term use, the surface of the metal plate 901 is coated with an anti-corrosion coating. Coated with fire retardant coating.

Specifically, the noise measurement device is used to detect the audio frequency data of the test product in the silent test box. The noise measurement device includes a MIC sound control sensor 10 and a sound level meter. The MIC sound control sensor 10 is arranged in the silent test box. The sound level meter is set in the control system, and the noise measurement device can identify various weighted sound pressure levels, sound spectrums, and sound pressure amplitudes of the test product.

Referring to FIG. 8 , the feeding device 11 is set in the silent test box, the feeding device 11 includes a fixed base 1101 , a sliding device is provided on the fixed base 1101 , and the sliding device includes a fixed base 1101 . The sliding rail 1102, the pneumatic slider 1103 matched with the sliding rail 1102, the sliding platform 1104 arranged on the pneumatic slider 1103, the sliding platform 1104 is provided with a secondary pushing device, the secondary pushing The device includes a push source 1105 and an experimental test bench 1106. The experimental test bench 1106 is provided with a product limiting fixture. During testing, the pneumatic slider 1103 drives the sliding platform 1104 along the slide rail 1102 to push out the mute test box. After the block 1103 reaches the maximum stroke, the push source 1105 of the secondary push-out device drives the experimental test bench 1106 to be further pushed out of the silent test box, extending the stroke of the experimental test bench 1106 in the silent test box, and after the experimental test bench 1106 is pushed out , place the test product on the product limit fixture, clamp and fix it, and there is no need for testers to measure and calibrate the placement position of the test product. Finally, the experimental test table 1106 is pulled back into the silent test box through the secondary push device and sliding device, and the test is completed. After that, the action is repeated again, which reduces a lot of unnecessary human operation process, which not only ensures the test accuracy of the product, but also greatly reduces the work intensity of the tester.

Specifically, the product limiting fixture includes a limiting groove 1107 matching the shape of the test product, a fixed limiting block 1108 is provided on one side of the limiting groove 1107 , and a fixed limiting block 1108 is provided on the other side of the limiting groove 1107 Set the sliding limit block 1110 connected with the limit cylinder 1109, first place the test product in the limit groove 1107, determine the position of the test product through the shape-matched limit groove 1107, and then push the sliding limit through the limit cylinder 1109 Block 1110 clamps the test product in place.

Specifically, the control system is electrically connected with the silent test box, the noise measuring device, and the feeding device 11 to control the operation of the entire system. The control system includes an industrial control box 12 and an industrial control display screen 13, and the industrial control box 12 includes a computer Host, acquisition card, sound level meter, electrical control switch, solenoid valve, cooling fan, control button, the control box 12 integrates the control of the cylinder action of the entire test system and the processing of the cylinder induction signal through the electrical control switch and solenoid valve ;Acquisition, output, data calculation, data analysis, identification and judgment, and storage of acoustic measurement signals are realized through the computer host, acquisition card, and sound level meter, and the manual interaction between the system and the operator is realized through the industrial control display screen 13 and control buttons. .

Specifically, the silent test box is also provided with a monitoring camera 14 and a lighting fixture 15, which can realize real-time monitoring of the test product.

Specifically, a three-color signal indicator light 16 is also provided outside the mute test box, which identifies three test states with different definitions.

The above-mentioned embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims

A silent test system, characterized in that it includes a silent test box, a noise measurement device, a feeding device and a control system;

The mute test box includes an inner sound insulation box, an outer sound insulation box and a vibration damping device, and both the inner sound insulation box and the outer sound insulation box are provided with sound insulation doors and anti-leakage sound insulation. A junction box and an inspection door, a lifting device is arranged on the inner side of the sound insulation door of the inner sound insulation box, a pressing device is arranged on the outer side of the sound insulation door of the outer sound insulation box, and the inner sound insulation box is provided with a pressing device. A sound absorption device is also arranged in the box;

The noise measuring device is used to detect the audio data of the test product in the silent test box;

The feeding device can enter and exit the silent test box for picking and placing test products;

The control system is electrically connected with the silent test box, the noise measuring device and the feeding device, and is used for controlling the work of the whole system.
The silent test system according to claim 1, wherein the vibration damping device comprises a plurality of medium and high frequency vibration dampers arranged between the inner sound insulation box and the outer sound insulation box, and a plurality of medium and high frequency vibration dampers arranged in the outer sound insulation box. A load-bearing bracket and a plurality of low frequency shock absorbers under the sound insulation box; a plurality of the medium and high frequency shock absorbers are distributed in a rectangular array between the inner sound insulation box and the outer sound insulation box, and a plurality of the low frequency shock absorbers are arranged in a rectangular array. The shock absorbers are arranged at the four corners of the load-bearing bracket, and limit blocks are arranged on the load-bearing bracket, the limit blocks are protruded upward and arranged on the edge of the load-bearing bracket, and the limit blocks limit the sound insulation box of the outer layer. Location.
The mute test system according to claim 1, wherein the anti-leakage sound-insulating box is inserted through and embedded on the side walls of the inner-layer sound-insulating box and the outer-layer sound-insulating box, and is used for passing through and entering the The required pipelines in the silent test box, including the inner sound insulation box, the fixing frame outside the outer sound insulation box, and the wire-passing combination module embedded in the inner sound insulation box and the outer sound insulation box , the outside of the wire-passing combination module is provided with a protrusion protruding from the inner sound insulation box and the outer sound insulation box, the fixing frame is sleeved on the protrusion, and the wire-passing combination module It includes at least two layers of wire-passing sub-modules set by clamping, the multi-layer wire-passing sub-modules are connected by bolt locking, and a wire-passing hole is opened on the center line of the adjacent two layers of wire-passing sub-modules after the moulds are closed, so The above-mentioned wire hole is matched with the required pipeline clearance.
The mute test system according to claim 1, wherein the lifting device comprises a first rotating support assembly arranged on the sound insulation door of the inner sound insulation box and a first rotating support assembly arranged on the inner sound insulation box. Two rotating support assemblies, the first rotating support assembly includes a first support base and a first rotating head, the second rotating support assembly includes a second support base and a second rotating head, the first rotating head and the second rotating head A telescopic cylinder is arranged between the rotating heads, and the telescopic cylinder drives the sound insulation door to open or close. When the sound insulation door is in a closed state, the telescopic cylinder drives the sound insulation door to continue to apply pressure to the inner layer of the sound insulation box. Press the soundproof door against the inner soundproof box.
The silent test system according to claim 1, wherein the pressing device comprises a fixed pressing block arranged on the side of the sound insulation door of the outer sound insulation box and a pressing component arranged on the outer sound insulation box , the pressing component includes a pressing cylinder, a door tongue pressing block and a door tongue fixing support, the door tongue fixing support is arranged on the outer sound insulation box, and the door tongue pressing block is hinged on the On the door tongue fixing support, the door tongue pressing block on one side of the pivot is pressed against the fixed pressing block, and the door tongue pressing block on the other side of the pivot is connected with the pressing cylinder, and the pressing cylinder Drive the door tongue pressure block to move in the direction of approaching or away from the fixed pressure block to realize the opening and closing action of the door tongue pressure block. When the door tongue pressure block is in the closed state, the pressing cylinder drives the door tongue pressure block to continue to the fixed pressure block. Apply pressure in the direction of the pressure block, and press the door tongue pressure block to the fixed pressure block.
The silent test system according to claim 1, wherein the sound absorption device comprises a metal plate arranged in the inner sound insulation box, and the metal plate is arranged on the six sides of the inner sound insulation box. On the inner wall, the metal plates on any two adjacent surfaces are spliced and arranged, the metal plates on the six surfaces are spliced to form a metal plate cavity, the metal plate is provided with a number of through holes penetrating the metal plate, and the metal plate is connected with the metal plate. A filling layer of sound absorbing material is arranged between the inner walls of the inner layer sound insulation box.
The silent test system according to claim 1, wherein the noise measurement device comprises a MIC sound sensor and a sound level meter, the MIC sound sensor is arranged in the silent test box, and the sound level meter is arranged in the control system , the noise measurement device can identify various weighted sound pressure levels, sound spectrum, and sound pressure amplitudes of the test product.
The silent test system according to claim 1, wherein the feeding device is arranged in the silent test box, the feeding device comprises a fixed base, and a sliding device is provided on the fixed base, and the sliding device comprises a set of A sliding rail on the fixed base, a pneumatic slider matched with the sliding rail, and a sliding platform arranged on the pneumatic sliding block, the sliding platform is provided with a secondary push-out device, and the secondary push-out device includes The driving source and the experimental test bench are provided with product limit fixtures.
The mute test system according to claim 1, wherein the control system comprises an industrial control box and an industrial control display screen, and the industrial control box comprises a computer host, an acquisition card, a sound level meter, an electrical control switch, a solenoid valve, a heat dissipation Fan, control button, the control box integrates the control of the cylinder action of the entire test system, the processing of the cylinder induction signal; the acquisition, output, data operation, data analysis, identification and judgment, and storage of the acoustic measurement signal.
The mute test system according to claim 1, wherein the mute test box is further provided with a monitoring camera and a lighting fixture.