CN103731791A - Automatic assembling equipment of magnetic circuit system of loudspeaker - Google Patents

Automatic assembling equipment of magnetic circuit system of loudspeaker Download PDF

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Publication number
CN103731791A
CN103731791A CN201310719860.6A CN201310719860A CN103731791A CN 103731791 A CN103731791 A CN 103731791A CN 201310719860 A CN201310719860 A CN 201310719860A CN 103731791 A CN103731791 A CN 103731791A
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China
Prior art keywords
rivet
magnet
washer
magnetic circuit
riveting
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Granted
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CN201310719860.6A
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Chinese (zh)
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CN103731791B (en
Inventor
王伟
程峰
桑传鹏
龙玲
陈忠云
陈兴平
蒋宗健
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Sankyo Precision Huizhou Co Ltd
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Sankyo Precision Huizhou Co Ltd
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Priority to CN201310719860.6A priority Critical patent/CN103731791B/en
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Publication of CN103731791B publication Critical patent/CN103731791B/en
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Abstract

The invention relates to automatic assembling equipment of a magnetic circuit system of a loudspeaker. The automatic assembling equipment comprises a bottom plate, wherein a feeding mechanism and a washer and rivet combined mechanism are arranged on the bottom plate; the feeding mechanism comprises a rotary table, clamps and a driver, the rotary table is equally divided in a multi-station mode, the clamps are arranged on the periphery of the rotary table at equal intervals to accumulate and position one end of a rivet cap of each rivet, and the driver drives the rotary table to step intermittently to replace stations; a magnet feeding structure, a T iron feeding structure, a PCB feeding structure and a riveting pressing mechanism are further sequentially arranged on the bottom plate and around the rotary table, the magnet feeding structure, the T iron feeding structure and the PCB feeding structure respectively enable a magnet, T iron and a PCB to be connected to the rivets in a sleeved mode, the riveting pressing mechanism opens a hollow folding edge structure end portion arranged at the other end, away from the rivet cap, of each rivet in a riveted mode, and the mechanisms are controlled by a master control circuit. A rotary table type production mode is adopted, a washer, the magnet, the T iron and the PCB can be assembled and riveted automatically, efficiency is improved because the stations work simultaneously, existing manual operation is replaced, labor cost is lowered, the mechanisms are mechanically controlled to achieve automatic positioning, alignment is accurate, and product consistency is good.

Description

A kind of magnetic circuit of loudspeaker automatic assembly equipment
Technical field
The present invention relates to a kind of magnetic circuit of loudspeaker automatic assembly equipment, specifically refer in a kind of loud speaker manufacture process washer, magnet, T iron, pcb board are dressed up to the automated machine of magnetic circuit system by stack of rivets.
Background technology
Along with the development of loudspeaker techniques, the range of application of speaker unit is more and more wider.A loud speaker is all equipped with in the existing inside that is applicable to insert earphone or earphone, the loud speaker of conventional art, involving vibrations system, magnetic circuit system and the shell that vibrational system, magnetic circuit system are combined.As shown in Figure 1, this built-in magnetic circuit system of loud speaker is by washer 1, magnet 2, T iron 3, pcb board 4 and rivet 5 form, at present, the assembling of this magnetic circuit system is mainly by manually completing, concrete steps are: the first station staff first combines washer 1 and rivet 5, then it is placed on and above driving-belt, flows to next station, time second station, staff passes rivet 5 magnet 2 again, be placed on above washer 3, when product continues to flow to the 3rd station, staff passes rivet by T iron 1, be placed on magnet top, when product flows to the 4th station, staff passes rivet by pcb board, be placed on T iron top, complete after the assembling of above-mentioned four stations, these semi-finished product are installed with box, again by special riveting personnel by its riveting.Above-mentioned packaging technology need to expend a large amount of manpowers, and inefficiency has improved production cost, and manual work is many, and contraposition is lack of standardization, and consistency is poor, and magnetic circuit system quality is unstable, and overall efficiency and quality are low; Operation is many, labor strength is large.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency of the prior art, the magnetic circuit of loudspeaker automatic assembly equipment that a kind of production efficiency is high, reduce cost of labor is provided.
The object of the invention is to be achieved through the following technical solutions:
A magnetic circuit of loudspeaker automatic assembly equipment, described assembling is that washer, magnet, T iron, pcb board are dressed up to magnetic circuit system by stack of rivets, comprises base plate, described base plate is provided with:
Feed mechanism, feed mechanism comprises rotating disk, fixture and the driver of multistation decile, and fixture equidistant placement is emitted one end in rotating disk periphery to hold the also rivet of quilting rivet, and station is changed in the stepping of driver drives turntable intermittent;
Washer and rivet combination mechanism, be arranged on a side of feed mechanism, comprise work in combination platform, automatic rivet feeding device, washer automatic feeding, described work in combination platform is provided with rivet detent mechanism, described rivet detent mechanism is connected with rivet pay-off by a guide rail, described guide rail is provided with propelling movement cylinder, for the rivet that automatic rivet feeding device is sent, push to one by one rivet detent mechanism, also comprise the first manipulator, the washer absorption that described the first manipulator is provided with for washer automatic feeding is sent moves to work in combination platform and is socketed in the suction nozzle on rivet and washer and stack of rivets zoarium after socket are picked up to the gas pawl on the fixture that moves to feed mechanism,
On described base plate, around described rotating disk, be also provided with the magnet feeding structure that successively magnet, T iron, pcb board is socketed on rivet, T iron feeding structure, pcb board feeding structure and rivet is provided with to the riveting mechanism that hollow turnup structure end riveting is opened away from the other end of rivet cap, each mechanism controls by governor circuit.
As a modification of the present invention, on described base plate, be also provided with straightening mechanism, be arranged between washer and rivet combination mechanism and magnet feeding structure, for the rivet bar of rivet being proofreaied and correct for erectting shape, comprise elevating mechanism and be arranged on the correcting plate of elevating mechanism below, described correcting plate is provided with rivet correction hole.
Concrete, described automatic rivet feeding device comprises the first blanking slideway that rivet is got the raw materials ready vibrating disk and is connected with its discharging opening, the middle part lotus root of the discharging opening of described the first blanking slideway and described guide rail connects.
Concrete, described washer automatic feeding comprises the second blanking slideway that washer is got the raw materials ready vibrating disk and is connected with its discharging opening, the discharging opening of described the first blanking slideway is connected with a washer location notch.
Concrete, described magnet feeding structure comprise magnet get the raw materials ready vibrating disk, with magnet the 3rd blanking slideway and the second manipulator that vibrating disk discharging opening is connected of getting the raw materials ready, the discharging opening of described the 3rd blanking slideway is connected with magnet location notch, and described the second manipulator picks up the magnet of magnet location notch on the rivet of the fixture that moves and be socketed in feed mechanism.
Described T iron feeding structure, pcb board feeding structure are consistent with above-mentioned magnet feeding structure operation principle, repeat no more herein.
Described riveting mechanism comprises a riveting cylinder, on described riveting cylinder piston, be connected with one with the riveting bar of piston coaxial.
As another improvement of the present invention, on described base plate, be also provided with and the completed knocked down products after riveting picked up above the fixture of rotating disk to the 3rd manipulator that moves to material box, the 3rd manipulator is arranged on a side of riveting mechanism.
The present invention has the following advantages and beneficial effect compared to existing technology:
The present invention adopts rotating disc type production model, only need an Artificial Control governor circuit, realized automatic Composition washer, magnet, T iron, pcb board and by they automatic rivetings, each station is worked and raised the efficiency simultaneously, substitute existing manual work, reduce cost of labor; Each mechanism's mechanical type controls location automatically, and contraposition is accurate, and good product consistency guarantees the quality of assembling.
Accompanying drawing explanation
Fig. 1 is the decomposition texture schematic diagram of the magnetic circuit of loudspeaker;
Fig. 2 is the stereogram of the magnetic circuit of loudspeaker;
Fig. 3 is the stereogram of magnetic circuit of loudspeaker automatic assembly equipment of the present invention;
Fig. 4 is the partial enlarged drawing of A part in Fig. 1;
Fig. 5 is the vertical view of magnetic circuit of loudspeaker automatic assembly equipment of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Fig. 3~5, the present embodiment provides a kind of magnetic circuit of loudspeaker automatic assembly equipment, and described assembling is that washer, magnet, T iron, pcb board are dressed up to magnetic circuit system by stack of rivets, comprises base plate 6, and described base plate 6 is provided with:
Feed mechanism 7, feed mechanism 7 comprises rotating disk 701, fixture 702 and the driver (not shown) of multistation decile, fixture 702 equidistant placement are emitted one end in rotating disk 701 peripheries to hold the also rivet of quilting rivet, and driver drives rotating disk 701 intermittently steppings is changed station;
Washer and rivet combination mechanism 8, be arranged on a side of feed mechanism 7, comprise work in combination platform 801, automatic rivet feeding device 802, washer automatic feeding 803, described work in combination platform 801 is provided with rivet detent mechanism 804, described rivet detent mechanism 804 is connected with rivet pay-off 802 by a guide rail 805, described guide rail 805 is provided with and pushes cylinder 806, for the rivet that automatic rivet feeding device 803 is sent, push to one by one rivet detent mechanism 804, also comprise the first manipulator 807, the washer absorption that described the first manipulator 807 is provided with for washer automatic feeding 803 is sent moves to work in combination platform and is socketed in the suction nozzle 808 on rivet and washer and stack of rivets zoarium after socket are picked up to the gas pawl 809 on the fixture 702 that moves to feed mechanism 7,
On described base plate 6, around described rotating disk 701, be also provided with the magnet feeding structure 9 that successively magnet, T iron, pcb board is socketed on rivet, T iron feeding structure 10, pcb board feeding structure 11 and rivet is provided with to the riveting mechanism 12 that hollow turnup structure end riveting is opened away from the other end of rivet cap, each mechanism controls by governor circuit.
On described base plate, be also provided with straightening mechanism 13, be arranged between washer and rivet combination mechanism 8 and magnet feeding structure 9, for the rivet bar of rivet being proofreaied and correct for erectting shape, comprise elevating mechanism 1301 and be arranged on the correcting plate 1302 of elevating mechanism 1301 belows, described correcting plate 1302 is provided with rivet correction hole, and described elevating mechanism 1301 is a slide unit cylinder.By straightening mechanism, rivet bar is proofreaied and correct, guaranteed that follow-up magnet feeding structure, T iron feeding structure, pcb board feeding structure can accurately be socketed on rivet, to bit specifications, high conformity.
Described automatic rivet feeding device 802 comprises the first blanking slideway 8022 that rivet is got the raw materials ready vibrating disk 8021 and is connected with its discharging opening, and the middle part lotus root of the discharging opening of described the first blanking slideway 8022 and described guide rail 805 connects.Rivet is sent to guide rail middle part along the first blanking slideway under rivet is got the raw materials ready the effect of vibrating disk, then by pushing cylinder, rivet is pushed to rivet detent mechanism.
Described washer automatic feeding 803 comprises the second blanking slideway 8032 that washer is got the raw materials ready vibrating disk 8031 and is connected with its discharging opening, and the discharging opening of described the first blanking slideway 8032 is connected with a washer location notch 8033.Above-mentioned washer automatic feeding first by washer under washer is got the raw materials ready the vibration of vibrating disk
Described magnet feeding structure 9 comprise magnet get the raw materials ready vibrating disk 901, with magnet the 3rd blanking slideway 902 and the second manipulator 903 that vibrating disk 901 discharging openings are connected of getting the raw materials ready, the discharging opening of described the 3rd blanking slideway 902 is connected with magnet location notch 904, and described the second manipulator 903 picks up the magnet of magnet location notch 904 on the rivet of the fixture 702 that moves and be socketed in feed mechanism 7.
Described T iron feeding structure 10, pcb board feeding structure 11 are consistent with above-mentioned magnet feeding structure operation principle, repeat no more herein.
Described riveting mechanism 12 comprises a riveting cylinder 1201, on described riveting cylinder 1201 pistons, be connected with one with the riveting bar (not shown) of piston coaxial.
On described base plate 6, be also provided with and the completed knocked down products after riveting picked up above the fixture 702 of rotating disk to the side that the 3rd manipulator 14, the three manipulators 14 that move to a material box are arranged on riveting mechanism.By the 3rd manipulator by the completed knocked down products automatic blanking after riveting, compact conformation, simple and reliable.
Operation principle of the present invention is as follows:
On base plate 6, be fixed wtih each mechanism, rivet is pulled on guide rail 805 under rivet is got the raw materials ready the driving of vibrating disk 8021, push cylinder 806 rivet is pushed to rivet detent mechanism 804, the suction nozzle 808 of the first manipulator 807 is drawn the washer of sending from washer automatic feeding 803 to move to work in combination platform and be socketed in rivet, and the first manipulator 807 is put into the washer combining and stack of rivets zoarium above rotating disk 701 station clamp 702 above by gas pawl 809 again; Rotating disk 701 turns to next station, and straightening mechanism 13 is corrected by the perpendicularity of 1302 pairs of rivets of correcting plate, completes after rectification, and rotating disk continues to forward to next station; Magnet feeding structure 9, T iron feeding structure 10, pcb board feeding structure 11 are sent magnet, T iron, pcb board automatically by vibrating disk successively, then by manipulator, they are socketed on rivet respectively successively, and combination completes; Rotating disk is rotated further, next station is riveting station, riveting bar 1202 is provided with hollow turnup structure end riveting by rivet away from the other end of rivet cap and opens under the drive of riveting cylinder 1201, realize being assembled of product, after riveted, the 3rd manipulator 14 grabs the magnetic circuit system product assembling get off above the tool of rotating disk 701, and is placed in material box.
Above-described embodiment is preferably execution mode of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.

Claims (7)

1. a magnetic circuit of loudspeaker automatic assembly equipment, described assembling is that washer, magnet, T iron, pcb board are dressed up to magnetic circuit system by stack of rivets, comprises base plate, it is characterized in that, described base plate is provided with:
Feed mechanism, feed mechanism comprises rotating disk, fixture and the driver of multistation decile, and fixture equidistant placement is emitted one end in rotating disk periphery to hold the also rivet of quilting rivet, and station is changed in the stepping of driver drives turntable intermittent;
Washer and rivet combination mechanism, be arranged on a side of feed mechanism, comprise work in combination platform, automatic rivet feeding device, washer automatic feeding, described work in combination platform is provided with rivet detent mechanism, described rivet detent mechanism is connected with rivet pay-off by a guide rail, described guide rail is provided with propelling movement cylinder, for the rivet that automatic rivet feeding device is sent, push to one by one rivet detent mechanism, also comprise the first manipulator, the washer absorption that described the first manipulator is provided with for washer automatic feeding is sent moves to work in combination platform and is socketed in the suction nozzle on rivet and washer and stack of rivets zoarium after socket are picked up to the gas pawl on the fixture that moves to feed mechanism,
On described base plate, around described rotating disk, be also provided with the magnet feeding structure that successively magnet, T iron, pcb board is socketed on rivet, T iron feeding structure, pcb board feeding structure and rivet is provided with to the riveting mechanism that hollow turnup structure end riveting is opened away from the other end of rivet cap, each mechanism controls by governor circuit.
2. magnetic circuit of loudspeaker automatic assembly equipment according to claim 1, it is characterized in that, on described base plate, be also provided with straightening mechanism, be arranged between washer and rivet combination mechanism and magnet feeding structure, for the rivet bar of rivet being proofreaied and correct for erectting shape, comprise elevating mechanism and be arranged on the correcting plate of elevating mechanism below, described correcting plate is provided with rivet correction hole.
3. magnetic circuit of loudspeaker automatic assembly equipment according to claim 1, it is characterized in that, described automatic rivet feeding device comprises the first blanking slideway that rivet is got the raw materials ready vibrating disk and is connected with its discharging opening, and the middle part lotus root of the discharging opening of described the first blanking slideway and described guide rail connects.
4. magnetic circuit of loudspeaker automatic assembly equipment according to claim 1, it is characterized in that, described washer automatic feeding comprises the second blanking slideway that washer is got the raw materials ready vibrating disk and is connected with its discharging opening, and the discharging opening of described the first blanking slideway is connected with a washer location notch.
5. magnetic circuit of loudspeaker automatic assembly equipment according to claim 1, it is characterized in that, described magnet feeding structure comprise magnet get the raw materials ready vibrating disk, with magnet the 3rd blanking slideway and the second manipulator that vibrating disk discharging opening is connected of getting the raw materials ready, the discharging opening of described the 3rd blanking slideway is connected with magnet location notch, and described the second manipulator picks up the magnet of magnet location notch on the rivet of the fixture that moves and be socketed in feed mechanism.
6. according to magnetic circuit of loudspeaker automatic assembly equipment described in claim 1-5 any one, it is characterized in that, described riveting mechanism comprises a riveting cylinder, on described riveting cylinder piston, be connected with one with the riveting bar of piston coaxial.
7. magnetic circuit of loudspeaker automatic assembly equipment according to claim 6, it is characterized in that, on described base plate, be also provided with and the completed knocked down products after riveting picked up above the fixture of rotating disk to the 3rd manipulator that moves to material box, the 3rd manipulator is arranged on a side of riveting mechanism.
CN201310719860.6A 2013-12-23 2013-12-23 A kind of magnetic circuit of loudspeaker automatic assembly equipment Active CN103731791B (en)

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Cited By (28)

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Publication number Priority date Publication date Assignee Title
CN104139103A (en) * 2014-06-26 2014-11-12 梧州恒声电子科技有限公司 Fast riveting process of spring washer and basin stand
CN104625731A (en) * 2015-02-27 2015-05-20 苏州博众精工科技有限公司 Auto-align multi-station parts mounter
CN105499987A (en) * 2015-12-31 2016-04-20 佛山市南海科利华数控科技有限公司 Full-automatic speaker magnetic circuit assembling machine
CN105959899A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device for basin frame in loudspeaker
CN105959896A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device for basin frame in loudspeaker
CN105959898A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device for basin frame in loudspeaker
CN105959900A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device for basin frame in loudspeaker
CN105959902A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device used for basin frame of speaker
CN105959901A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device for basket in loudspeaker
CN105959903A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device used for basin frame of speaker
CN105959897A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device for basin frame in loudspeaker
CN105979443A (en) * 2016-06-16 2016-09-28 苏州天朋精密元器件有限公司 Riveting device for cone frame in loudspeaker
CN106101973A (en) * 2016-06-16 2016-11-09 苏州天朋精密元器件有限公司 A kind of riveting device of frame in speaker
CN106101972A (en) * 2016-06-16 2016-11-09 苏州天朋精密元器件有限公司 A kind of riveting device of frame in speaker
CN106239132A (en) * 2016-08-29 2016-12-21 宁波汽车软轴软管有限公司 Antivibrator automatic assembling
CN106239133A (en) * 2016-08-29 2016-12-21 宁波汽车软轴软管有限公司 A kind of antivibrator automatic assembling
CN106658263A (en) * 2017-02-11 2017-05-10 中山市天键通讯技术有限公司 Automatic assembling equipment for concentric magnetic path assembly
CN106714071A (en) * 2017-02-11 2017-05-24 中山市天键通讯技术有限公司 Concentric assembly method for earphone magnetic circuit component
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CN108145645A (en) * 2016-12-05 2018-06-12 苏州海斯恩自动化有限公司 A kind of magnet assembling mechanism
CN108145436A (en) * 2018-02-25 2018-06-12 戴毅 The Electronic product precision assembling equipment of Kernel-based methods monitoring
CN108391220A (en) * 2018-03-16 2018-08-10 吉林航盛电子有限公司 The positioning device of the magnetic circuit of loudspeaker
CN110113704A (en) * 2019-05-22 2019-08-09 深圳市久巨工业设备有限公司 Loudspeaker Assembling Production system
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CN113411739A (en) * 2021-07-29 2021-09-17 浙江欧赛电子有限公司 Automatic assembling system for T iron of loudspeaker
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Publication number Priority date Publication date Assignee Title
CN104139103A (en) * 2014-06-26 2014-11-12 梧州恒声电子科技有限公司 Fast riveting process of spring washer and basin stand
CN104625731A (en) * 2015-02-27 2015-05-20 苏州博众精工科技有限公司 Auto-align multi-station parts mounter
CN105499987A (en) * 2015-12-31 2016-04-20 佛山市南海科利华数控科技有限公司 Full-automatic speaker magnetic circuit assembling machine
CN105959899A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device for basin frame in loudspeaker
CN105959896A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device for basin frame in loudspeaker
CN105959898A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device for basin frame in loudspeaker
CN105959900A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device for basin frame in loudspeaker
CN105959902A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device used for basin frame of speaker
CN105959901A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device for basket in loudspeaker
CN105959903A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device used for basin frame of speaker
CN105959897A (en) * 2016-06-16 2016-09-21 苏州天朋精密元器件有限公司 Riveting device for basin frame in loudspeaker
CN105979443A (en) * 2016-06-16 2016-09-28 苏州天朋精密元器件有限公司 Riveting device for cone frame in loudspeaker
CN106101973A (en) * 2016-06-16 2016-11-09 苏州天朋精密元器件有限公司 A kind of riveting device of frame in speaker
CN106101972A (en) * 2016-06-16 2016-11-09 苏州天朋精密元器件有限公司 A kind of riveting device of frame in speaker
CN106239132B (en) * 2016-08-29 2018-11-13 宁波汽车软轴软管有限公司 Damper automatic assembling
CN106239132A (en) * 2016-08-29 2016-12-21 宁波汽车软轴软管有限公司 Antivibrator automatic assembling
CN106239133A (en) * 2016-08-29 2016-12-21 宁波汽车软轴软管有限公司 A kind of antivibrator automatic assembling
CN106239133B (en) * 2016-08-29 2018-10-26 宁波汽车软轴软管有限公司 A kind of damper automatic assembling
CN108145645A (en) * 2016-12-05 2018-06-12 苏州海斯恩自动化有限公司 A kind of magnet assembling mechanism
CN106658263A (en) * 2017-02-11 2017-05-10 中山市天键通讯技术有限公司 Automatic assembling equipment for concentric magnetic path assembly
CN106714071A (en) * 2017-02-11 2017-05-24 中山市天键通讯技术有限公司 Concentric assembly method for earphone magnetic circuit component
CN106658263B (en) * 2017-02-11 2023-10-13 天键医疗科技(广东)有限公司 Automatic assembling equipment for concentric magnetic circuit assembly
CN106714071B (en) * 2017-02-11 2019-04-26 中山市天键通讯技术有限公司 The concentric assemble method of earphone magnetic circuit component
CN107553103A (en) * 2017-10-12 2018-01-09 重庆市灵龙自动化设备有限公司 A kind of core assembly automatic assembling machine
CN107995580A (en) * 2017-11-27 2018-05-04 国光电器股份有限公司 A kind of automatic injecting glue riveter and its application
CN107995580B (en) * 2017-11-27 2020-07-10 国光电器股份有限公司 Automatic glue injection riveting press and assembling method of washer and basin stand
CN108145436A (en) * 2018-02-25 2018-06-12 戴毅 The Electronic product precision assembling equipment of Kernel-based methods monitoring
CN108391220A (en) * 2018-03-16 2018-08-10 吉林航盛电子有限公司 The positioning device of the magnetic circuit of loudspeaker
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CN110328524A (en) * 2019-07-09 2019-10-15 温州市恩磊自动化科技有限公司 Book ring automatic assembling machine
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