WO2023005268A1 - Dispositif d'entraînement d'armature équilibrée, procédé d'assemblage de dispositif d'entraînement d'armature équilibrée, et récepteur - Google Patents

Dispositif d'entraînement d'armature équilibrée, procédé d'assemblage de dispositif d'entraînement d'armature équilibrée, et récepteur Download PDF

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Publication number
WO2023005268A1
WO2023005268A1 PCT/CN2022/087533 CN2022087533W WO2023005268A1 WO 2023005268 A1 WO2023005268 A1 WO 2023005268A1 CN 2022087533 W CN2022087533 W CN 2022087533W WO 2023005268 A1 WO2023005268 A1 WO 2023005268A1
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WO
WIPO (PCT)
Prior art keywords
iron core
fixed
cavity
bracket
diaphragm
Prior art date
Application number
PCT/CN2022/087533
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English (en)
Chinese (zh)
Inventor
贾少伟
刘建军
廖兵
董杰
刘洋
Original Assignee
深圳市长盈精密技术股份有限公司
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
Priority claimed from CN202110855622.2A external-priority patent/CN113645554A/zh
Priority claimed from CN202110856065.6A external-priority patent/CN113542999A/zh
Application filed by 深圳市长盈精密技术股份有限公司 filed Critical 深圳市长盈精密技术股份有限公司
Publication of WO2023005268A1 publication Critical patent/WO2023005268A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type

Definitions

  • the present application relates to the field of audio communication, in particular to a moving iron unit, a method for assembling the moving iron unit, and a receiver.
  • the moving iron unit is an electro-acoustic conversion unit used in earphones and hearing aids. It is used to convert electrical signals into sound signals.
  • the size of the moving iron unit is extremely small, and product assembly is extremely difficult. It must be assembled in an automated way. test.
  • a moving iron receiver which includes a metal casing, a motor assembly assembled in the metal casing, a diaphragm that divides the metal casing into a front cavity and a rear cavity, and connects the motor The reed of the component and the connection pin of the diaphragm.
  • the metal shell is divided into upper and lower parts, including an upper shell and a lower shell.
  • the diaphragm is clamped between the upper shell and the lower shell and fixed by dispensing or welding. When assembling, the lower shell The depth is relatively deep, which is not convenient for automatic assembly and welding of the motor assembly.
  • the metal shell is sealed by dispensing glue, which has the problem of poor sealing, which leads to sound leakage and affects the sound quality effect.
  • the diaphragm includes a bracket, flapping wings and a membrane, and the flap is connected to the bracket by thermoforming the membrane. The thermoforming scheme of this process is complicated and the yield rate is low.
  • the motor assembly includes a "back"-shaped iron core, a pair of magnets placed on the upper and lower sides of the iron core, a coil bonded to one longitudinal end of the iron core, and at least partially passing through the coil and a pair of the The reeds between the magnets, the magnets need to be bonded inside the iron core, and the assembly cannot be automated, or the glue cannot stably fix the magnets in the iron core, and it is easy to loosen and cause quality problems question.
  • the application provides a moving iron unit, which includes a housing with a cavity inside, a diaphragm that divides the cavity into an upper cavity and a lower cavity, and a motor fixed in the lower cavity Assemblies, the shell includes a lower shell, a middle frame and an upper shell, the diaphragm separates the cavity into an upper cavity and a lower cavity, the motor assembly is fixed in the lower shell, and the middle frame is sleeved The motor assembly is outside the motor assembly and connected with the lower case, and the motor assembly drives the diaphragm to vibrate up and down.
  • the application provides a method for assembling a moving iron unit, including the following steps:
  • the casing includes a lower casing, a middle frame, and an upper casing, and fix the motor assembly in the lower casing;
  • the diaphragm includes a bracket, vibrating wings, and a film thermoformed on the bracket and the vibrating wings, and cover and fix the bracket of the diaphragm on the upper side of the middle frame;
  • the motor assembly includes a magnetic unit, a coil, and a reed, and the other end of the connecting rod is fixed on the vibrating wing so that the reed and the vibrating wing are linked;
  • the first longitudinal end of the lower case is provided with a lead wire outlet
  • the second longitudinal end of the upper case is provided with a sound outlet
  • the motor assembly includes a coil provided with a lead wire
  • the lead wire extends to the At the outlet of the lead wire
  • the soldering piece includes a solder piece fixed at the longitudinal first end of the housing and solder for welding the lead wire to the solder piece.
  • the present application also provides a receiver, including the aforementioned moving iron unit.
  • the moving iron unit of this application greatly reduces the depth of the lower case by dividing the outer case into independent lower case, middle frame and upper case, thereby reducing the difficulty of automatically assembling the motor assembly in the lower case , at the same time taking into account the convenience of automatic dispensing of the connecting rod to fix the connecting rod in the connecting hole and the through hole after the diaphragm is assembled.
  • This design scheme greatly improves the automation capability, greatly improves the product assembly efficiency and reduces the manufacturing cost.
  • Fig. 1 is the three-dimensional assembly diagram of the moving iron unit of the present application
  • Fig. 2 is a partial three-dimensional exploded view of the moving iron unit of the present application
  • Figure 3 is a complete three-dimensional exploded view of the moving iron unit of the present application.
  • Fig. 4 is the perspective view of the diaphragm of the moving iron unit of the present application.
  • Fig. 5 is a three-dimensional exploded view of the diaphragm of the moving iron unit of the present application.
  • Fig. 6 is a sectional view along the broken line B-B shown in Fig. 5;
  • Fig. 8 is a sectional view along the dashed line C-C shown in Fig. 7;
  • Fig. 9 is a sectional view along the dashed line A-A shown in Fig. 1 .
  • the X direction shown in FIG. 1 is taken as the longitudinal direction
  • the Y direction is taken as the transverse direction
  • the Z direction is taken as the vertical direction.
  • the moving iron unit of the present application includes a housing 10, a diaphragm 20 that separates the housing 10 into an upper chamber S1 and a lower chamber S2, and is assembled on the lower chamber of the housing 10.
  • the motor assembly 30 in the chamber S2 and the weldment 40 disposed at one longitudinal end of the housing 10 .
  • the casing 10 includes a middle frame 11, an upper casing 13 and a lower casing 12 respectively located on the upper and lower sides of the middle frame 11, the diaphragm 20 is clamped between the middle frame 11 and the upper casing 13, The diaphragm 20 and the upper shell 13 define the upper chamber S1. The diaphragm 20 is surrounded by the middle frame 11 and the lower case 12 to form the lower cavity S2.
  • the middle frame 11 includes a frame body 111 and a cavity 112 penetrating up and down and surrounded by the frame body 11 .
  • the frame body 111 includes an upper surface 113 and a lower surface 114 .
  • the frame body 111 is roughly in the shape of a rectangular parallelepiped.
  • the lower shell 12 includes a lower shell 121 , a lower shell sidewall 122 bent upward from the outer periphery of the lower shell 121 , and a lead wire outlet 123 defined at a first longitudinal end of the lower shell 12 .
  • the upper surface of the lower shell side wall 122 is in contact with the lower surface 114 of the middle frame 11 and fixed together by welding on the outer periphery.
  • the upper shell 13 includes an upper shell 131 , an upper shell side wall 132 bent downward from the outer periphery of the upper shell 131 , and a sound outlet 133 defined at the second longitudinal end of the upper shell 13 .
  • the upper shell side wall 132 and the upper surface 113 of the middle frame 11 clamp the diaphragm 20 and are welded and fixed together from the outer periphery.
  • the diaphragm 20 includes a bracket 21, a vibrating wing 22 integrally connected with the bracket 21, and a film 23 formed on the bracket 21 and the flapping wing 22 by thermocompression .
  • the bracket 21 includes a longitudinal side bracket body 211 and a lateral side bracket body 212 .
  • the vibrating wing 22 includes a wing body 221, a rib 222 punched upward from the wing body 221, a connecting hole 223 penetrating up and down through the first longitudinal end of the wing body 221, and a second longitudinal end of the wing body 221 up and down.
  • the opening 224 at the end.
  • the bracket 21 and the vibrating wing 22 are formed by one stamping of a metal plate, and the longitudinal second end of the vibrating wing 22 is connected as a whole with the longitudinal side bracket body 211 of the bracket 21 through the connecting part 24 .
  • the connecting portion 24 is preferably a pair, and a cutting hole 25 is formed between the pair of connecting portions 24, and a gap 26 is formed between the flapping wing 22 and the bracket 21 except the connecting portion 24,
  • the flapping wings 22 can vibrate up and down depending on the connecting portion 24 , and the width of the connecting portion 24 should not be too wide so that it has a certain degree of elasticity.
  • the cutting hole 25 may be present as part of the recess 26 .
  • the connecting portion 24 is connected to the vertical side support body 211 and is close to the position of the lateral side support body 212.
  • the size of the flapping wing 22 is very small, so it is preferable to adopt a design scheme of a pair of connecting parts 24 so as not to fall off during vibration.
  • the connecting portion 24 can also be a single design, at this time, the connecting portion 24 needs to have a certain width, and the gap 26 and the cutting hole 25 are connected as one .
  • the flapping wing 22 can also be connected as a whole with the lateral support body 212 of the support 21 through the connecting portion 24.
  • This embodiment is not a preferred solution because it does not follow the direction of the connecting portion 24 on the elastic fulcrum. direction of extension, resulting in easy breakage.
  • the function of the ribs 224 is to maintain the consistency of the vibrating wing 22 when it vibrates up and down, even when the vibrating wing 22 vibrates up and down, both lateral sides maintain a consistent flatness vibration to avoid uneven vibration.
  • the expression form of the rib 222 can be a whole, and the area is larger than half of the area of the flap 22, or the rib 222 exists in multiple forms to ensure the consistency of the vibration of the flap 22 as a principle.
  • the membrane 23 includes a wing body 231 thermoformed and bonded on the lower surface of the flap 22 and the bracket 21 , a runway 232 pressed upward from the wing body 231 into the space 26 , and a running track 232 formed from the wing body 231
  • the rib adhering portion 233 on the lower surface of the rib 222 is attached upward.
  • the wing body 231 is pierced with a through hole 234 corresponding to the connecting hole 223 of the flapping wing 22 , and the wing body 231 is formed through a hole 234 corresponding to the opening 224 of the flapping wing 22 to communicate with the upper chamber S1 and the lower cavity.
  • the inner diameter of the through hole 234 is consistent with the inner diameter of the connecting hole 223 , and the pitch of the flow holes 235 is much smaller than the pitch of the openings 224 .
  • the lower side of the cutting hole 25 between the flapping wing 22 and the bracket 21 is adhered and sealed by the film 23 .
  • the top of the runway 232 protrudes from the bracket 21 to a certain distance from the upper surface of the flap 22 so that the flap 22 is connected by the membrane 23 when vibrating up and down and provides a vibration stroke.
  • the bracket 21 and the vibrating wing 22 of the conventional diaphragm 20 are of a split structure.
  • the membrane 23 is hot-pressed, the membrane 23 is hot-pressed on the bracket 21 and then the The vibrating wing 22 is attached to the upper side of the film 23 and overlaps with the bracket 21 at one end in the longitudinal direction.
  • the manufacturing process is complicated and the defective rate is high.
  • brackets 21 and vibrating wings 22 are punched and formed into several brackets 21 and vibrating wings 22 connected by strips.
  • the film 23 is thermally formed on the support 21 and the flapping wing 22 connected together by several material strips at one time, and then the film 23 outside the support 21 is cut off by laser cutting, and the holes are perforated by laser or hot needle
  • the through hole 234 and the flow hole 235 are formed in a manner, and the diaphragm 20 is manufactured by removing the cut film 23 .
  • the vibration film 20 of the present application stamps the support 21 and the vibrating wing 22 integrally, and forms a gap 26 between the support 21 and the vibrating wing 22 for the film 23 to form a runway 232 , and the The connecting part 24 connects the vibrating wing 22 to the bracket 21 and provides a certain holding force.
  • the structure of the vibrating wing in this application is simple, and the stamping process and thermoforming process are simplified, which can effectively improve the yield and reduce the manufacturing cost. .
  • FIG. 2 Please continue to refer to FIG. 2, FIG. 3, and FIG.
  • the magnetic unit 31 includes an iron core with a receiving space 3113 penetrating longitudinally, and a first magnet 313 and a second magnet 314 respectively bonded to the upper and lower sides of the receiving space 3113 .
  • a cavity 315 is formed between the first magnet 313 and the second magnet 314, the first magnet 313 and the second magnet 314 are in a plate-like structure and face each other at a distance from the cavity 315, so Both the first magnet 313 and the second magnet 314 are surrounded by the iron core.
  • the iron core includes a first iron core 311 and a second iron core 312 , and the accommodation space 3113 is formed by the first iron core 311 and the second iron core 312 .
  • the first iron core 311 includes a bottom wall 3111 and vertical walls 3112 extending upward from both lateral sides of the bottom wall 3111.
  • the first iron core 311 is substantially in a U-shaped structure
  • the bottom wall 3111 includes an inner surface 3115 of the bottom wall bonded with the second magnet 314, and the vertical wall 3112 includes a surface 3115 bonded with the second iron core.
  • 312 the vertical wall top surface 3114 that fits and is welded together.
  • the second iron core 312 has a plate-like structure, and its width is larger than that of the first magnet 313.
  • the second iron core 312 includes a top wall 3121, and the top wall 3121 includes The inner surfaces 3122 of the top walls come together.
  • the transverse widths of the first magnet 313 and the second magnet 314 are smaller than the transverse width of the receiving space 3113 .
  • the coil 32 includes a coil body 321 , a coil hole 322 extending longitudinally and corresponding to the cavity 315 , and a pair of lead wires 323 .
  • the structure of the coil 32 is a known technology, and will not be repeated here.
  • the reed 33 has a U-shaped structure, and the reed 33 includes a fixed part 331, a tightening part 332 formed by reversely bending from one longitudinal end of the fixed part 331, and a tension part 332 formed by horizontally extending from the tightening part 332.
  • the vibrating part 333 located below the fixing part 331 and the extension part 334 extending forward from the vibrating part 333 are formed.
  • the fixing part 331 is fixed on the upper surface of the iron core by laser welding, that is, the free end side of the fixing part 331 is attached to the upper surface of the second iron core 312 and at the joint
  • the sides of the fixed part 331 are fixed together by welding, the side of the fixed part 331 close to the tension part 332 is suspended above the coil 32, and the vibrating part 333 enters the first magnet 313 and the first magnet 313 from the coil hole 322.
  • the cavity 315 between the second magnets 314 is in a suspended state.
  • the extension part 334 extends out of the magnetic unit 31 and is located below the connection hole 223 and the through hole 234 of the diaphragm 20 , one end of the connecting rod 34 is welded to the surface of the extension part 334 , and the connecting rod 34 The other end passes through the connection hole 223 and the through hole 234 and at least partly enters the upper chamber S1, and glue is dispensed in the connection hole 223 and the through hole 234 to fix one end of the connecting rod 34 on the on the diaphragm 20 .
  • the assembly method of the motor assembly 30 includes the following steps:
  • glue is applied to the surfaces of the first magnet 313 and the second magnet 314, and then the first magnet 313 is adhered to the inner surface 3122 of the top wall of the second iron core 312, The second magnet 314 is adhered to the inner surface 3115 of the bottom wall of the first iron core 311; then, curing is carried out, and the curing can be carried out by means of light or the like.
  • This step can be accomplished using an automated process.
  • the width of the first iron core 311 is consistent with the width of the second iron core 312, and the two side edges of the second iron core 312 are attached to the top surface 3114 of the vertical wall and on the second iron core.
  • the corresponding position on the upper surface of 312 is fixed by spot welding.
  • the vibration part 332 is suspended in the cavity 315 between the coil hole 322 and the first magnet 313 and the second magnet 314, and the extension part 334 protrudes from the magnet.
  • the outer side of the unit 31, the fixing part 331 is supported on the upper surface of the second iron core 312 and fixed by welding, the part of the fixing part 331 located on the upper side of the coil 32 is not in contact with the coil 32 and is suspended
  • the tensioning portion 332 is located outside the coil 32 .
  • the motor assembly 30 of the present application divides the iron core of the magnetic unit 31 into independent first iron cores 311 and second iron cores 312, so that the first magnets 313 and the second magnets 314 are glued together first. Bonded to the second iron core 312 and the first iron core 311, and then the second iron core 312 and the first iron core 311 are welded and fixed, thus avoiding the traditional technique of only longitudinally bonding the magnet As a result, the bonding is not firm and the automatic assembly cannot be realized.
  • the welding piece 40 includes a welding piece 41 bonded to the longitudinal side of the housing 10, a lead hole 411 opened on the welding piece 41 and connected to the lead outlet 123, and the lead wire 323 of the coil 32 is welded. Solder 42 on the solder pad 41 .
  • the working principle of the moving iron unit of the present application is as follows.
  • the motor assembly 30 is made to generate magnetism, and the vibrating part 33 of the reed 30 vibrates up and down, and the connecting rod 34 drives the The vibrating wings 22 of the diaphragm 20 vibrate up and down to generate sound signals in the upper cavity S1 and pass through the sound outlet 133 .
  • This principle is a prior art and will not be repeated here.
  • the assembly of the moving iron unit of the present application includes the following steps:
  • the assembly of the motor assembly 30 is carried out with reference to the aforementioned method.
  • the surface of the lower shell 12 can be coated with glue, and then the motor assembly 30 is bonded downward to the surface of the lower shell 12; Specifically, the lower surface of the first iron core 311 is bonded to the lower shell 12 .
  • the lower surface 114 of the frame body 111 of the middle frame 11 is attached to the upper surface of the lower casing side wall 122 and pre-fixed by spot welding at a part of the joint.
  • the outer dimension of the bracket 21 is consistent with the outer dimension of the frame body 111 , and after the two are bonded together, the junction of the frame body 111 and the surface of the bracket 21 is pre-welded and fixed from the outer periphery.
  • the connecting rod 34 extends from the connection hole 223 and the through hole 234 of the diaphragm 20 to the upper side of the diaphragm 20 .
  • the diaphragm 20 can be directly bonded and fixed in the middle frame 11 without clamping the diaphragm 20 by the middle frame 11 and the upper shell 13, that is, the traditional middle frameless structure,
  • the vibrating membrane 20 is directly bonded in the upper case, but this step causes difficulty in dispensing glue and cannot be produced automatically.
  • the bottom surface of the upper shell side wall 132 of the upper shell 13 is attached to the upper surface of the bracket 21 and fixed by pre-welding from the outer periphery.
  • the position of the laser welding includes the position of the joint between the lower shell 12 and the bottom of the frame body 111, the position of the joint between the frame body 111 and the bracket 21, and the position of the joint between the bracket 21 and the upper shell 13. Continuous welding is carried out by means of multiple lasers and rotating the moving iron unit to achieve sealing of each junction, so that the upper cavity S1 and the lower cavity S2 are kept in a relatively sealed state.
  • the moving iron unit and its manufacturing method of the present application by dividing the shell 10 into independent lower shell 12, middle frame 11 and upper shell 13, greatly reduces the depth of the lower shell 12, and then can realize the motor assembly 30 It is automatically assembled in the lower shell 12 , and at the same time, it is convenient for the connecting rod 34 to be automatically dispensed and fixed in the connecting hole 223 and the through hole 234 after the diaphragm 20 is assembled.
  • This design scheme greatly improves the automation capability, greatly improves the product assembly efficiency and reduces the manufacturing cost.
  • the joints of the lower shell 12, the middle frame 11, the support 21 of the diaphragm 20 and the upper shell 13 are fixed by pre-welding a small number of points, and finally the outer periphery of the joint is sealed by continuous laser welding. .
  • the present application also includes a receiver, and the receiver includes the moving iron unit.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

L'invention concerne un dispositif d'entraînement à armature équilibrée, comprenant un boîtier qui est pourvu intérieurement d'une cavité, une membrane qui divise la cavité en une cavité supérieure et une cavité inférieure, et un ensemble moteur qui est fixé dans la cavité inférieure. Le boîtier comprend un boîtier inférieur, un cadre intermédiaire et un boîtier supérieur. La membrane est serrée entre le cadre central et le boîtier supérieur et divise la cavité en une cavité supérieure et une cavité inférieure. L'ensemble moteur est fixé dans le boîtier inférieur, le cadre central est gainé à l'extérieur de l'ensemble moteur et est joint et fixé au boîtier inférieur, et l'ensemble moteur fait vibrer la membrane de haut en bas. Dans le dispositif d'entraînement à armature équilibrée de la présente invention, la structure d'une partie des composants est simplifiée, permettant à la conception structurelle de réaliser plus facilement l'assemblage automatique des composants, et l'utilisation de la main d'œuvre est réduite.
PCT/CN2022/087533 2021-07-28 2022-04-19 Dispositif d'entraînement d'armature équilibrée, procédé d'assemblage de dispositif d'entraînement d'armature équilibrée, et récepteur WO2023005268A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN202110855622.2 2021-07-28
CN202110855622.2A CN113645554A (zh) 2021-07-28 2021-07-28 动铁单元的组装方法
CN202110856065.6A CN113542999A (zh) 2021-07-28 2021-07-28 动铁单元及受话器
CN202110856065.6 2021-07-28

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WO2023005268A1 true WO2023005268A1 (fr) 2023-02-02

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PCT/CN2022/087533 WO2023005268A1 (fr) 2021-07-28 2022-04-19 Dispositif d'entraînement d'armature équilibrée, procédé d'assemblage de dispositif d'entraînement d'armature équilibrée, et récepteur

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130070950A1 (en) * 2009-12-30 2013-03-21 Hwang-Miaw Chen Microphone module with helmholtz resonance chamber
CN206775740U (zh) * 2017-04-19 2017-12-19 苏州亿欧得电子有限公司 一种新型受话器外壳
CN108391215A (zh) * 2018-04-26 2018-08-10 深圳倍声声学技术有限公司 一种动铁受话器
CN108429954A (zh) * 2018-04-12 2018-08-21 深圳倍声声学技术有限公司 一种壳体及受话器
CN108924707A (zh) * 2018-08-24 2018-11-30 苏州三色峰电子有限公司 一种膜片组件及基于该膜片组件的受话器及其制作方法
CN110870331A (zh) * 2017-07-14 2020-03-06 美商楼氏电子有限公司 声受话器及其制作方法
CN113542999A (zh) * 2021-07-28 2021-10-22 深圳市长盈精密技术股份有限公司 动铁单元及受话器
CN113645554A (zh) * 2021-07-28 2021-11-12 深圳市长盈精密技术股份有限公司 动铁单元的组装方法
CN113825074A (zh) * 2021-07-28 2021-12-21 深圳市长盈精密技术股份有限公司 动铁单元

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130070950A1 (en) * 2009-12-30 2013-03-21 Hwang-Miaw Chen Microphone module with helmholtz resonance chamber
CN206775740U (zh) * 2017-04-19 2017-12-19 苏州亿欧得电子有限公司 一种新型受话器外壳
CN110870331A (zh) * 2017-07-14 2020-03-06 美商楼氏电子有限公司 声受话器及其制作方法
CN108429954A (zh) * 2018-04-12 2018-08-21 深圳倍声声学技术有限公司 一种壳体及受话器
CN108391215A (zh) * 2018-04-26 2018-08-10 深圳倍声声学技术有限公司 一种动铁受话器
CN108924707A (zh) * 2018-08-24 2018-11-30 苏州三色峰电子有限公司 一种膜片组件及基于该膜片组件的受话器及其制作方法
CN113542999A (zh) * 2021-07-28 2021-10-22 深圳市长盈精密技术股份有限公司 动铁单元及受话器
CN113645554A (zh) * 2021-07-28 2021-11-12 深圳市长盈精密技术股份有限公司 动铁单元的组装方法
CN113825074A (zh) * 2021-07-28 2021-12-21 深圳市长盈精密技术股份有限公司 动铁单元

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