CN107147977A - A kind of convenient fixing device of loudspeaker - Google Patents

A kind of convenient fixing device of loudspeaker Download PDF

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Publication number
CN107147977A
CN107147977A CN201710123927.8A CN201710123927A CN107147977A CN 107147977 A CN107147977 A CN 107147977A CN 201710123927 A CN201710123927 A CN 201710123927A CN 107147977 A CN107147977 A CN 107147977A
Authority
CN
China
Prior art keywords
block
slide slot
footstock
slide
lock
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201710123927.8A
Other languages
Chinese (zh)
Inventor
翁碧莹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201710123927.8A priority Critical patent/CN107147977A/en
Publication of CN107147977A publication Critical patent/CN107147977A/en
Withdrawn legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/02Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/025Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02Details
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06Loudspeakers

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Clamps And Clips (AREA)

Abstract

The invention discloses a kind of convenient fixing device of loudspeaker, including footstock and the department of assembly being arranged on below footstock, accommodating chamber is provided with footstock, the first slide slot is provided with the inwall of the accommodating chamber left and right sides accordingly, at the top of first slide slot the second slide slot is provided with away from accommodating chamber side, provided with sliding block and the position guiding rod of mating connection is slided with sliding block in second slide slot, block inner edge is slided to put in the first slide slot and slide cooperation, block bottom is slided provided with bayonet lock in first slide slot, accommodating chamber inner roof wall is provided with the lock pillar extended downwards, lower section is provided with the corresponding driving chamber in left and right in lock pillar, spacer block is provided between the driving chamber of the left and right sides, the 3rd slide slot is equipped with the top of each driving chamber, push block is provided with driving chamber;The present invention is simple in construction, is easily installed and dismantles, and installs steadiness height, is not likely to produce loosening, is adapted to promote the use of.

Description

A kind of convenient fixing device of loudspeaker
Technical field
The present invention relates to public address equipment technical field, more particularly to a kind of convenient fixing device of loudspeaker.
Background technology
In the public place that some flows of the people are larger, for example(Hospital, school, railway station etc.)Often set using loudspeaker It is standby, for amplifying.Existing loudspeaker apparatus is typically all to be fixed on by bolt or screw on wall roof, although this fixation Mode is more firm, but its installation process is relatively complicated laborious, when loudspeaker, which breaks down, needs repair and maintenance, need to first pass through Instrument is dismantled to bolt or screw, and it has that replacing difficulty is larger and changes speed, has a strong impact on work Efficiency.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of convenient fixing device of loudspeaker, and it can solve the problem that above-mentioned existing In the art the problem of.
The present invention is achieved through the following technical solutions:A kind of convenient fixing device of loudspeaker of the present invention, including It is provided with footstock and the department of assembly being arranged on below the footstock, the footstock in accommodating chamber, the accommodating chamber left and right sides It is provided with accordingly on wall at the top of the first slide slot, first slide slot and is provided with the second slide slot away from the accommodating chamber side, It is described to slide block inner edge provided with sliding block and sliding the position guiding rod that block slides mating connection with described in second slide slot Put in first slide slot and slide the block bottom of sliding in cooperation, first slide slot provided with bayonet lock, it is described Accommodating chamber inner roof wall is provided with lower section in the lock pillar extended downwards, the lock pillar and is provided with the corresponding driving chamber in left and right, the left and right sides It is provided with to be equipped with to be provided with the 3rd slide slot, the driving chamber at the top of spacer block, each driving chamber between the driving chamber and pushes away Flank side surface in block, the push block is sent to be provided with the second stage clip, the push block is provided with insertion institute away from the second stage clip side State lock pillar outer wall and put in the slippery fellow of the oblique lock in the accommodating chamber, the push block top side face inner edge edge is provided with projecting inward It is provided with the spacer block between block, the 3rd slide slot in driving machine, the 3rd slide slot and is provided with screw rod, the spiral shell Swing arm is connected with the driving machine rotatable engagement, and spiral lamination is connected with contiguous block, the contiguous block bottom on the screw rod Side outside edge be provided with outer casting lug thereon, the department of assembly by collet and the inserting column being fixedly installed at the top of the collet, The collet bottom is fixed with loudspeaker, and the loudspeaker is provided with protecting crust, the appearance close to described collet one end outer surface Receive and be provided with fitting recess in the footstock in bottom of chamber portion, simultaneously provided with sucker, the sucker on four angles of top side face of the footstock To the fixation of the footstock, touch inductor is provided with the footstock.
On the outside of the position guiding rod for sliding block inner top in preferably technical scheme, second slide slot Provided with groove portion, the position guiding rod lateral surface winding above the groove portion is provided with the first stage clip.
The locked groove being connected with the lock pillar is provided with preferably technical scheme, the inserting column, the inserting column is left Edge is provided with the block of leading that mating connection is slided with first slide slot at the top of right both sides, and described lead in a block top side face sets There is the pin hole being connected with the bayonet lock, the locked groove inner top edge is provided with slides cooperation company with the oblique lock slippery fellow It is correspondingly provided with the skewed slot connect, the locked groove lower inside left and right sides inwall and the oblique foxy lockhole being connected of lock.
Preferably technical scheme, the touch inductor includes touch sensor and sensing lamp, the touching sense Device is answered to be arranged on the footstock upper side inner edge, the sensing lamp is arranged on the footstock left front face, the touch sensing Device be connected with the sensing circuit for lamp, can encounter when the connecting pole reaches the footstock inside touch sensor from And make it that the sensing lamp is opened, indicate that installing locking completes.
The beneficial effects of the invention are as follows:
1. setting lower section in the lock pillar extended downwards, lock pillar by accommodating chamber inner roof wall sets the corresponding driving chamber in left and right, the left and right sides Lock pillar between set spacer block, be all provided with the 3rd slide slot, driving chamber setting flank side surface in push block, push block at the top of each driving chamber If the second stage clip, push block is away from the second stage clip side is provided with lock pillar outer wall described in insertion and puts in the cunning of the oblique lock in accommodating chamber Head, push block top side face inner edge edge, which is set, sets driving machine, the 3rd slide slot in the spacer block between projecting inward piece, the 3rd slide slot Screw rod is inside set, screw rod is connected with driving machine rotatable engagement, spiral lamination mating connection contiguous block on screw rod, so as to realize certainly Dynamic locking and automatic unlocking, reduce the personnel to operate, and improve operating efficiency.
2. leading above groove portion, groove portion is set by winding on the outside of the position guiding rod for sliding block inner top in the second slide slot Position bar lateral surface winding sets the first stage clip, so as to realize that the fastening of footstock and department of assembly is installed, prevents from loosening, improves footstock and dress Steadiness after being connected with portion.
3. it is used to by setting edge at the top of the locked groove for being used to be connected with lock pillar, the inserting column left and right sides in inserting column and setting With the first slide slot slides mating connection leads a block, so as to realize that guiding is slided, improve and accuracy and installation rate be installed, By leading the pin hole set in a block top side face to be connected with bayonet lock, so as to prevent department of assembly from surprisingly falling after realizing unblock Fall, set by locked groove inner top edge to slide the skewed slot of mating connection with tiltedly lock slippery fellow, so as to reduce abrasion, pass through lock It is corresponding on the inwall of the groove lower inside left and right sides to set to tiltedly locking the foxy lockhole being connected, so as to realize locking connection.
4. the present invention is simple in construction, it is easily installed and dismantles, steadiness height is installed, loosening is not likely to produce, suitable popularization makes With.
Brief description of the drawings
For ease of explanation, the present invention is described in detail by following specific embodiment and accompanying drawing.
Fig. 1 is the convenient fixing device internal structure schematic diagram of a kind of loudspeaker of the invention;
Fig. 2 is the upward view of the footstock of the present invention;
Structural representation when Fig. 3 abuts against for the oblique lock slippery fellow of the present invention with skewed slot;
Fig. 4 a block and slides structural representation when block is abutted against for leading for the present invention;
Fig. 5 is the internal structure schematic diagram after the footstock of the present invention and department of assembly's installation;
Fig. 6 is the top view of the footstock of the present invention.
Embodiment
As shown in figs 1 to 6, the convenient fixing device of a kind of loudspeaker of the invention, including footstock 3 and the setting top The lower section of seat 3, which is provided with department of assembly 4, the footstock 3, is provided with accommodating chamber 31, is set accordingly on the left and right sides inwall of accommodating chamber 31 There is the first slide slot 33, the top of the first slide slot 33 is provided with the second slide slot 35 away from the side of accommodating chamber 31, described It is provided with second slide slot 35 and slides block 353 and slide the position guiding rod 351 that block 353 slides mating connection, the cunning with described The inner edge of row block 353 put in first slide slot 33 and slide in cooperations, first slide slot 33 described in slide block 353 Bottom is provided with bayonet lock 3532, and the inner roof wall of accommodating chamber 31 is provided with lower section in the lock pillar 32 extended downwards, the lock pillar 32 and is provided with Spacer block 324, each driving chamber 321 are provided between the corresponding driving chamber 321 in left and right, the driving chamber 321 of the left and right sides Top, which is equipped with the 3rd slide slot 325, the driving chamber 321, is provided with push block 322, and flank side surface is set in the push block 322 There is the second stage clip 323, the push block 322 is away from the side of the second stage clip 323 is provided with the outer wall of lock pillar 32 described in insertion and stretches The oblique lock slippery fellow 3221 entered in the accommodating chamber 31, the top side face inner edge edge of push block 322 is provided with projecting inward piece 3222, It is provided with the spacer block 324 between 3rd slide slot 325 in driving machine 326, the 3rd slide slot 325 and is provided with spiral Bar 327, the screw rod 327 is connected with the rotatable engagement of driving machine 326, and spiral lamination is connected on the screw rod 327 There is edge on the outside of contiguous block 328, the bottom side of contiguous block 328 to be provided with outer casting lug thereon 3281, the department of assembly 4 is by collet 41 And the inserting column 42 at the top of collet 41 is fixedly installed on, the bottom of collet 41 is fixed with loudspeaker 411, described to raise one's voice Device 411 is provided with protecting crust 412 close to one end outer surface of collet 41, and the protecting crust 412 is used to prevent from promoting the dress During with portion 4, the loudspeaker 411 is caused damage due to exerting oneself excessive, set in the footstock 3 of the bottom of accommodating chamber 31 Have on fitting recess 34, four angles of top side face of the footstock 3 while provided with sucker 30, the sucker 30 is to the footstock 3 It is fixed, it is provided with touch inductor on the footstock 3.
Wherein, the outside of the position guiding rod 351 for sliding the inner top of block 353 in second slide slot 35 is provided with groove Portion 3531, the lateral surface of the position guiding rod 351 winding of the top of groove portion 3531 is provided with the first stage clip 352, passes through the first stage clip 352, so as to realize that footstock 3 and the fastening of department of assembly 4 are installed, prevent from loosening.
Wherein, the locked groove 43 being connected with the lock pillar 32, the left and right sides of inserting column 42 are provided with the inserting column 42 Top edge is provided with and first slide slot 33 slides mating connection leads a block 46, so as to realize that guiding is slided, is improved Accuracy and installation rate are installed, it is described to lead the pin hole for being provided with and being connected with the bayonet lock 3532 in the top side face of a block 46 47, so as to prevent department of assembly 4 from inadvertently falling off after realizing unblock, the inner top edge of locked groove 43 is provided with foxy with the oblique lock 3221 slide the skewed slot 45 of mating connection, so as to reduce abrasion, are accordingly set on the lower inside left and right sides inwall of locked groove 43 There is the lockhole 44 being connected with the oblique lock slippery fellow 3221, so as to realize locking connection.
Wherein, the touch inductor includes touch sensor 301 and sensing lamp 302, and the touch sensor 301 is set Put in the upper side inner edge of footstock 3, the sensing lamp 302 is arranged on the left front face of footstock 3, the touch sensor 301 are connected with the sensing circuit of lamp 302, and the touching can be encountered when the connecting pole 42 reaches 3 inside of footstock Inductor 301 is so that the sensing lamp 302 is opened, and instruction is installed locking and completed.
During original state, top pressure active force of the block 353 by the first stage clip 352 is slided so that slide block 353 positioned at second The most bottom side position of slide slot 35, now, contiguous block 328 are located in the 3rd slide slot 325 and deviate from the side of driving machine 326, meanwhile, Top pressure active force of the push block 322 by the second stage clip 323 so that push block 322, which is located in driving chamber 321, deviates from spacer block 324, Now, abutted against with outer casting lug thereon 3281 for projecting inward piece 3222, meanwhile, tiltedly lock slippery fellow 3221 is put in accommodating chamber 31.
When needing to install and use, footstock 3 is fixed with wall roof, then moving department of assembly 4 by sucker 30 first To the lower section of footstock 3 so that lead the slide slot 33 of a block 46 and first and be in relative position, department of assembly 4 is promoted then up so that A block 46 of leading on inserting column 42 and inserting column 42 is gradually inserted the slide slot 33 of accommodating chamber 31 and first respectively by fitting recess 34 It is interior, until skewed slot 45 as shown in Figure 3 is abutted against with tiltedly lock slippery fellow 3221, continue up promotion department of assembly 4 so that tiltedly lock is foxy 3221 are gradually overcome the active force of second stage clip 323 towards moving in driving chamber 321 by the thrust of skewed slot 45, until tiltedly lock Foxy 3221 outer lateral sides abut against with side wall in locked groove 43 and slide mating connection, are further continued for pushing up department of assembly 4, until Bayonet lock 3532 is slipped into after being squeezed in pin hole 47, now, lead the top side face of a block 46 and slide the bottom side of block 353 abut against as Shown in Fig. 4, promotion department of assembly 4 is finally continued up so that thrust of the block 353 by department of assembly 4 is slided, so as to overcome the first pressure The active force of spring 352 is moved up along the second slide slot 35, until as shown in figure 5, sliding block 353 is moved to the second slide slot 35 Most top side position, the first stage clip 352 now is entirely retracted to groove portion 3531, meanwhile, lockhole 44 is moved to tiltedly lock slippery fellow 3221 Relative position, tiltedly locks slippery fellow 3221 and is slipped into by the top pressure active force of the second stage clip 323 in lockhole 44, complete locking connection, this When, the bottom side of lock pillar 32 is abutted against with the bottom side of locked groove 43, meanwhile, collet 41 is completely embedded into fitting recess 34, finally, stops pushing away It is dynamic.
When needing demolition and maintenance or replacing, screw rod 327 is controlled to rotate by driving machine 326, by the company of drive of screw rod 327 Connect block 328 to move to inner edge along the 3rd slide slot 325, now, the outer casting lug thereon 3281 of the bottom of contiguous block 328 drives projecting inward piece 3222 and the push blocks 322 of projecting inward piece of 3222 bottoms overcome the top pressure active force of the second stage clip 323 towards the inner edge of driving chamber 321 It is mobile, meanwhile, driven and tiltedly locked in foxy 3221 retraction lock pillar 32 by push block 322, until tiltedly lock foxy 3221 outer lateral side with When the outer lateral side of lock pillar 32 is in same level, now, block 353 is slided by the top pressure active force of the first stage clip 352 to downslide Go and push down on and lead a block 46, by the promotion for sliding block 353, now, outside the ejection fitting recess 34 of collet 41, due to sliding block 353 and lead what is be connected by bayonet lock 3532 between a block 46, therefore department of assembly 4 will not be ejected completely, then will ejection The collet 41 of fitting recess 34 is pulled downward on so that bayonet lock 3532 is completely disengaged from pin hole 47 can be taken off department of assembly 4 and change Or maintenance, finally, control driving machine 326 reversely rotate screw rod 327 so that contiguous block 328 is moved to the 3rd slide slot 325 Outermost, meanwhile, push block 322 is mobile to the outside of driving chamber 321 by the active force of the second stage clip 323, until tiltedly lock is foxy 3221 at utmost put in accommodating chamber 31.
The beneficial effects of the invention are as follows:
1. setting lower section in the lock pillar extended downwards, lock pillar by accommodating chamber inner roof wall sets the corresponding driving chamber in left and right, the left and right sides Lock pillar between set spacer block, be all provided with the 3rd slide slot, driving chamber setting flank side surface in push block, push block at the top of each driving chamber If the second stage clip, push block is away from the second stage clip side is provided with lock pillar outer wall described in insertion and puts in the cunning of the oblique lock in accommodating chamber Head, push block top side face inner edge edge, which is set, sets driving machine, the 3rd slide slot in the spacer block between projecting inward piece, the 3rd slide slot Screw rod is inside set, screw rod is connected with driving machine rotatable engagement, spiral lamination mating connection contiguous block on screw rod, so as to realize certainly Dynamic locking and automatic unlocking, reduce the personnel to operate, and improve operating efficiency.
2. leading above groove portion, groove portion is set by winding on the outside of the position guiding rod for sliding block inner top in the second slide slot Position bar lateral surface winding sets the first stage clip, so as to realize that the fastening of footstock and department of assembly is installed, prevents from loosening, improves footstock and dress Steadiness after being connected with portion.
3. it is used to by setting edge at the top of the locked groove for being used to be connected with lock pillar, the inserting column left and right sides in inserting column and setting With the first slide slot slides mating connection leads a block, so as to realize that guiding is slided, improve and accuracy and installation rate be installed, By leading the pin hole set in a block top side face to be connected with bayonet lock, so as to prevent department of assembly from surprisingly falling after realizing unblock Fall, set by locked groove inner top edge to slide the skewed slot of mating connection with tiltedly lock slippery fellow, so as to reduce abrasion, pass through lock It is corresponding on the inwall of the groove lower inside left and right sides to set to tiltedly locking the foxy lockhole being connected, so as to realize locking connection.
4. the present invention is simple in construction, it is easily installed and dismantles, steadiness height is installed, loosening is not likely to produce, suitable popularization makes With.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any The change or replacement expected without creative work, should all be included within the scope of the present invention.Therefore, it is of the invention Protection domain should be determined by the scope of protection defined in the claims.

Claims (4)

1. a kind of convenient fixing device of loudspeaker, including footstock and the department of assembly that is arranged on below footstock is characterized in that:Top Provided with accommodating chamber in seat, it is provided with accordingly at the top of the first slide slot, the first slide slot away from appearance on the inwall of the accommodating chamber left and right sides Chamber side is received provided with the second slide slot, in the second slide slot provided with slide block and with slide that block slides mating connection lead position Bar, slides block inner edge and puts in the first slide slot and slide in cooperations, the first slide slot and slide block bottom provided with bayonet lock, receiving Intracavitary roof is provided with the lock pillar that extends downwards, lock pillar lower section provided with the corresponding driving chamber in left and right, the driving chamber of the left and right sides it Between be provided with the top of spacer block, each driving chamber and be equipped with the 3rd slide slot, flank side surface in push block, push block is provided with driving chamber and is set There is the second stage clip, push block is pushed away away from the second stage clip side is provided with insertion lock pillar outer wall and puts in the slippery fellow of the oblique lock in accommodating chamber The spacer block for sending block top side face inner edge edge to be provided between projecting inward piece, the 3rd slide slot is interior provided with driving machine, the 3rd slide slot Interior to be provided with screw rod, screw rod is connected with driving machine rotatable engagement, and spiral lamination is connected with contiguous block, contiguous block on screw rod Edge is provided with outer casting lug thereon on the outside of bottom side, and department of assembly is by collet and the inserting column being fixedly installed at the top of collet, collet bottom Portion is fixed with loudspeaker, and loudspeaker is provided with protecting crust, the footstock of accommodating chamber bottom provided with dress close to collet one end outer surface With groove, sucker is provided with four angles of top side face of footstock simultaneously, sucker is used to be provided with touching on the fixation of footstock, the footstock Induction installation.
2. the convenient fixing device of a kind of loudspeaker according to claim 1, it is characterised in that:In second slide slot The position guiding rod lateral surface winding above groove portion, the groove portion is provided with the outside of the position guiding rod for sliding block inner top to set There is the first stage clip.
3. the convenient fixing device of a kind of loudspeaker according to claim 1, it is characterised in that:It is provided with and institute in the inserting column State edge at the top of the locked groove of lock pillar mating connection, the inserting column left and right sides and be provided with to slide to coordinate with first slide slot and connect What is connect leads a block, described to lead the pin hole for being provided with and being connected with the bayonet lock in a block top side face, the locked groove inner top side It is provided with the skewed slot that mating connection is slided with the oblique lock slippery fellow, the locked groove lower inside left and right sides inwall and accordingly sets at Have and the oblique foxy lockhole being connected of lock.
4. the convenient fixing device of a kind of loudspeaker according to claim 1, it is characterised in that:The touch inductor bag Touch sensor and sensing lamp are included, the touch sensor is arranged on the footstock upper side inner edge, and the sensing lamp is arranged on The footstock left front face, the touch sensor is connected with the sensing circuit for lamp.
CN201710123927.8A 2017-03-03 2017-03-03 A kind of convenient fixing device of loudspeaker Withdrawn CN107147977A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710123927.8A CN107147977A (en) 2017-03-03 2017-03-03 A kind of convenient fixing device of loudspeaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710123927.8A CN107147977A (en) 2017-03-03 2017-03-03 A kind of convenient fixing device of loudspeaker

Publications (1)

Publication Number Publication Date
CN107147977A true CN107147977A (en) 2017-09-08

Family

ID=59783806

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710123927.8A Withdrawn CN107147977A (en) 2017-03-03 2017-03-03 A kind of convenient fixing device of loudspeaker

Country Status (1)

Country Link
CN (1) CN107147977A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107377568A (en) * 2017-09-18 2017-11-24 陈旭东 A kind of deduster equipment
CN114466264A (en) * 2021-12-21 2022-05-10 广州市锐丰数字科技有限公司 High-stability acoustic horn installation mechanism and application method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107377568A (en) * 2017-09-18 2017-11-24 陈旭东 A kind of deduster equipment
CN107377568B (en) * 2017-09-18 2018-12-04 永康市一搏工业产品设计有限公司 A kind of power equipment of deduster
CN114466264A (en) * 2021-12-21 2022-05-10 广州市锐丰数字科技有限公司 High-stability acoustic horn installation mechanism and application method thereof

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Application publication date: 20170908

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