CN106572424B - A kind of muffler earphone distortion testing device - Google Patents
A kind of muffler earphone distortion testing device Download PDFInfo
- Publication number
- CN106572424B CN106572424B CN201610975349.6A CN201610975349A CN106572424B CN 106572424 B CN106572424 B CN 106572424B CN 201610975349 A CN201610975349 A CN 201610975349A CN 106572424 B CN106572424 B CN 106572424B
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- CN
- China
- Prior art keywords
- jig
- rack gear
- block
- fixture
- fixed block
- 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.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
Abstract
The present invention relates to a kind of muffler earphone distortion testing device, including understructure, understructure is equipped with main structure, and main structure includes bottom plate, jig structure, clamp structure, eccentric wheel, connecting rod, and motor output shaft passes through bottom plate and connect with eccentric wheel；Connecting rod one end is connect with eccentric wheel, and the connecting rod other end is connect with the first rack gear；First rack gear connects the second rack gear by gear drive, is respectively provided with a set of jig structure on the first rack gear, the second rack gear.The present invention can measure earphone transverse strength, and easy to operate, cost is relatively low, and production efficiency and quality can be improved for production process.
Description
Technical field
The present invention relates to earphone production test fields, particularly as the device for being a kind of test muffler earphone anti-twisting property.
Background technique
Muffler earphone has good soundproof effect, and audio is also got well than general portable earphone, so
More and more people like using muffler earphone, are especially used to watch movie, play games, listen to music etc..However muffler ear
Machine is due to the movement frequently putting on and take, it is easy to cause the coupling part between two loudspeaker in left and right because firmly excessive
Or materials'use fatigue and damage, therefore, the torsional strength of muffler earphone become measure headphone quality a weight
Want standard.Technology still without a kind of special test earphone transverse strength at present.
Summary of the invention
To solve the above-mentioned problems, the invention proposes a kind of muffler earphone distortion testing devices, have structure simple, system
Make it is at low cost, it is easy to operate the features such as, be applied in muffler earphone test process, can improve test accuracy, improve test effect
Rate.
The present invention is a kind of muffler earphone distortion testing device, including understructure, and understructure is equipped with main structure,
Main structure includes bottom plate, jig structure, clamp structure, eccentric wheel, connecting rod, and motor is arranged below in bottom plate, and substrate is equipped with
Eccentric wheel, gear, fixture base；Motor output shaft passes through bottom plate and connect with eccentric wheel；Connecting rod one end is connect with eccentric wheel, connecting rod
The other end is connect with the first rack gear；First rack gear connects the second rack gear by gear drive, respectively sets on the first rack gear, the second rack gear
There is a set of jig structure, substrate is equipped with clamp structure far from one end of eccentric wheel, and clamp structure includes fixture base, folder
Have pedestal to be arranged on bottom plate, top of the clamping fixture seat of clamp structure end between the first rack gear and the second rack gear, first
Rack gear is parallel with the second rack gear.
In some embodiments, the first rack gear, the second rack gear are equipped with clamp structure, fixture knot packet far from one end of eccentric wheel
Containing the second handwheel, the second handwheel connects the second adjusting screw rod, and the second adjusting screw rod is arranged on fixture fixed block, fixture fixed block
It is arranged in fixture base, fixture base is fixed on bottom plate；Fixture fixed block is equipped with the second guide rod, and the second guide rod is remote
One end from fixture fixed block is equipped with the second guide rod fixed block, and second is equipped between the second guide rod fixed block and fixture fixed block and is adjusted
Whole screw rod, second adjustment screw rod are equipped with the second movable block, and the second movable block is arranged by two the second guide rods to be fixed in fixture
On block, the second movable block is equipped with clamping fixture seat, and clamping fixture seat is equipped with third handwheel, is equipped with lower fixture block and upper folder before clamping fixture seat
Block, lower fixture block top are equipped with upper fixture block, upper fixture block and lower fixture block setting symmetrical above and below, are equipped with third handwheel in upper fixture block；The
Two adjusting screw rods connect the second handwheel after running through the second guide rod fixed block.
In some embodiments, eccentric wheel is equipped with screw rod fixed block, and screw rod fixed block is equipped with screw rod, and screw rod is equipped with
Eccentric block, eccentric block are equipped with connecting rod, and connecting rod connects the first rack gear far from one end of eccentric block, is installed with jig on the first rack gear
The jig base of structure, bottom plate are equipped with gear, and the first rack gear is moved by gear teeth connects the second rack gear, fixed on the second rack gear
There is the jig base of another set of jig structure；Two sets of jig structures are separately connected the first rack gear, the second rack gear, and bottom plate, which is equipped with, to be slided
Seat, slide are equipped with slidable sliding rail, and sliding rail both ends are equipped with limited block, and sliding rail is equipped with rack gear (the first rack gear 131, second
Rack gear 13), sliding rail is equipped with rack gear by both ends limited block connection rack gear (the first rack gear 131, the second rack gear 13), limited block
(the first rack gear, the second rack gear).
In some embodiments, jig structure includes fixed handwheel, fixed handwheel connection fixture adjustment screw, jig adjustment
Screw rod is arranged between two pieces of jig guide rod fixed blocks, and jig guide rod fixed block is arranged in jig base, jig adjustment screw
Two pieces of jig movable blocks are equipped with, two pieces of jig movable blocks are connected by jig guide rod, and each jig movable block is equipped with one and controls
Have bar, two jig bar fixed earphone ends, jig base top is equipped with bolt；Jig guide rod fixed block is threaded through on bolt,
Jig base top is equipped with stroke pointer, and stroke pointer is located at below jig bar.
In some embodiments, jig guide rod fixed block is arranged in jig base by bolt, jig guide rod fixed block
It is equipped with adjustment screw, jig guide rod fixed block is externally provided with jig shield, and adjustment screw is connected and fixed handwheel, and the setting of jig bar exists
On jig movable block.
In some embodiments, understructure includes base member case, and base member case is equipped with control panel, power outlet, distribution
Plate, side, base member case are equipped with upper sealing plate on the control panel for panel setting, and upper sealing plate is equipped with graduated scale, upper sealing plate rear
Equipped with pedestal rear cover, upper sealing plate one end is connected.
Effect of the invention: the process of measurement muffler earphone torsion resistance is realized automation, the numerical value obtained is accurate, error
Small, test process efficiency improves；The present apparatus reduces testing cost, has practicability.
Detailed description of the invention
Fig. 1 is the schematic diagram of the total composite structure of the present invention；
Fig. 2 is the schematic diagram of main structure of the present invention；
Fig. 3 is the schematic diagram of jig structure of the present invention；
Fig. 4 is the schematic diagram of present clip structure；
Fig. 5 is the schematic diagram of understructure of the present invention.
Specific embodiment
Show technical characteristic of the invention, technical solution and the functional effect reached in order to clearer, below with reference to
The present invention is described in further detail with specific embodiment for attached drawing, please refers to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5.
The present invention includes understructure 103, and understructure 103 is equipped with main structure 105, and main structure 105 includes bottom
Plate 1, jig structure 100, clamp structure 102, rack gear 13, connecting rod 6, motor 16, bottom plate 1 are arranged below motor 16, above bottom plate 1
Equipped with eccentric wheel 2, gear 10, start button 15, fixture base 41；16 output shaft of motor passes through bottom plate 1 and connect with eccentric wheel 2.
6 one end of connecting rod is connect with eccentric wheel 2, and 6 other end of connecting rod is connect with the first rack gear 131；First rack gear 131 passes through tooth
10 the second rack gears 13 of transmission connection of wheel, are respectively provided with a set of jig structure 100 on the first rack gear 131, the second rack gear 13, on bottom plate 1
Face is equipped with clamp structure 102, and clamp structure 102 includes fixture base 41, and fixture base 41 is arranged on bottom plate 1.When work,
For motor 16 with movable eccentric wheel 2, eccentric wheel 2 is driven the first rack gear 131 by connecting rod 6, and the first rack gear 131 passes through the transmission of gear 10 the
Two rack gears 13.First rack gear 131 makees opposite front and back with the second rack gear 13 and intersects movement, and with carry-over bar (the first rack gear
131, the second rack gear 13) two sets of jig structures 100 above also make opposite front and back crisscross motion.
Further, clamp structure 102 include the second handwheel 46, the second handwheel 46 connect the second adjusting screw rod 45, second
Adjusting screw rod 45 is arranged on fixture fixed block 42, and fixture fixed block 42 is arranged in fixture base 41, and fixture base 41 is fixed
It is arranged on bottom plate 1；Fixture fixed block 42 is equipped with the second guide rod 44, and the second guide rod 44 is set far from one end of fixture fixed block 42
Have the second guide rod fixed block 47, between the second guide rod fixed block 47 and fixture fixed block 42 be equipped with second adjustment screw rod 45, second
Adjustment screw 45 is equipped with the second movable block 43, and the second movable block 43 is arranged by two the second guide rods 44 in fixture fixed block 42
On, the second movable block 43 is equipped with clamping fixture seat 49, and clamping fixture seat 49 is equipped with third handwheel 48, is equipped with lower fixture block before clamping fixture seat 49
51 be equipped with upper fixture block 50 above lower fixture block 51, upper fixture block 50 and the setting symmetrical above and below of lower fixture block 51 are equipped in upper fixture block 50
Third handwheel 48.When work, third handwheel 48 is adjusted to adjust the position of upper fixture block 50, lower fixture block 51, is clamped on earphone 104
Portion.The position that the second guide rod fixed block 47 is limited by adjusting the second handwheel 46 limits the mobile position of the second movable block 43
It sets.
Further, eccentric wheel 2 is equipped with screw rod fixed block 3, and screw rod fixed block 3 is equipped with screw rod 5, and screw rod 5 is equipped with
Eccentric block 4, eccentric block 4 are equipped with connecting rod 6, and connecting rod 6 connects the first rack gear 131, the first rack gear 131 far from one end of eccentric block 4
On be installed with the jig base 21 of jig structure 100, bottom plate 1 is equipped with gear 10, and the first rack gear 131 connects by the way that 10 tooth of gear is dynamic
The second rack gear 13 is connect, the jig base 21 of another set of jig structure 100 is installed on the second rack gear 13；Two sets of jig structures 100
It is separately positioned on the first rack gear 131, on the second rack gear 13.
Bottom plate 1 is equipped with slide 11, and slide 11 is equipped with slidable sliding rail 12, and 12 both ends of sliding rail are equipped with limited block 14,
Sliding rail 12 is equipped with rack gear (the first rack gear 131, the second rack gear 13), and sliding rail 12 connects rack gear (first by both ends limited block 14
Rack gear 131, the second rack gear 13), limited block 14 is equipped with rack gear (the first rack gear 131, the second rack gear 13).When eccentric wheel 2 rotates,
It is slidably reciprocated by eccentric block 4 on screw rod 5, to drive the back and forth movement of connecting rod 6, and with carry-over bar (the first rack gear
131, the second rack gear 13) two sets of jig structures 100 above also make opposite front and back crisscross motion.6 length of connecting rod is adjustable,
Under the induced effect of connecting rod 6 and the restriction effect of limited block 14, rack gear (the first rack gear 131, the second rack gear 13) is in sliding rail
Moving range on 12 can be set according to actual needs.
Further, jig structure 100 includes fixed handwheel 24, fixed 24 connection fixture adjustment screw 26 of handwheel, jig
Adjustment screw 26 is arranged between two pieces of jig guide rod fixed blocks 25, and jig guide rod fixed block 25 is arranged in jig base 21,
Jig adjustment screw 26 is equipped with two pieces of jig movable blocks 28, and two pieces of jig movable blocks 28 are connected by jig guide rod 27, each
Jig movable block 28 is equipped with a jig bar 29, and two 29 fixed earphone of jig bar, 104 ends are equipped at the top of jig base 21 and insert
Pin 23；Jig guide rod fixed block 25 is threaded through on bolt 23,21 top of jig base be equipped with stroke pointer 22,22, stroke pointer
In 29 lower section of jig bar；Jig guide rod fixed block 25 is arranged in jig base 21 by bolt 23, jig guide rod fixed block 25
It is equipped with adjustment screw 26, the jig guide rod fixed block 25 is externally provided with jig shield 30, and the adjustment screw 26 is connected and fixed
Handwheel 24, the jig bar 29 are arranged on jig movable block 28.
In one embodiment, fixture fixed block 42 is equipped with two the second guide rods 44, and the second guide rod 44 is solid far from fixture
The one end for determining block 42 is equipped with the second guide rod fixed block 47, and second is equipped between the second guide rod fixed block 47 and fixture fixed block 42 and is adjusted
Whole screw rod 45, second adjustment screw rod 45 are equipped with the second movable block 43, and the second movable block 43 passes through two the second guide rod 44 settings
On fixture fixed block 42, the second movable block 43 is equipped with clamping fixture seat 49, and clamping fixture seat 49 is equipped with third handwheel 48, clamping fixture seat 49
Front is equipped with lower fixture block 51 and upper fixture block 50, and lower fixture block 51 is located at 50 lower section of upper fixture block, and upper fixture block 50 and about 51 lower fixture block are right
Claim setting, is equipped with third handwheel 48 in upper fixture block 50.
Further, understructure 103 include base member case 62, base member case 62 be equipped with control panel 65, power outlet 63,
Panel 66, panel 66 are arranged above control panel 65, and base member case 62 is equipped with upper sealing plate 67, and upper sealing plate 67, which is equipped with, to be carved
Ruler 68 is spent, 67 rear of upper sealing plate is equipped with pedestal rear cover 69, and 67 one end of upper sealing plate is connected.
Working principle of the present invention: when test, by 104 upper clamp of earphone on earphone clamp structure 102, clamping fixture seat is adjusted
Third handwheel 48 on 49 makes clamp block clamp 104 top of earphone, and the both sides of earphone 104 are each defined in two jig bars 29
Between；According to the stroke to be distorted by adjusting the position of eccentric wheel 2, and then the moving range of rack gear is limited, finally existed
Drawing numbers and speed are set on control panel 65, start to test by start button 15.Reach drawing numbers after table and stops fortune
It is dynamic, check whether earphone damages.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (2)
1. a kind of muffler earphone distortion testing device, including understructure (103), which is characterized in that the understructure (103)
It is equipped with main structure (105), main structure (105) includes bottom plate (1), jig structure (100), clamp structure (102), bias
(2), connecting rod (6) are taken turns, bottom plate (1) is arranged below motor (16), and bottom plate (1) is equipped with eccentric wheel (2), gear (10) above；Motor
(16) output shaft passes through bottom plate (1) and connect with eccentric wheel (2)；Connecting rod (6) one end is connect with eccentric wheel (2), connecting rod (6) other end
It is connect with the first rack gear (131)；First rack gear (131) passes through gear (10) transmission connection the second rack gear (13), the first rack gear
(131), it is respectively provided with a set of jig structure (100) on the second rack gear (13), the one end of bottom plate (1) above far from eccentric wheel (2) is set
Having clamp structure (102), clamp structure (102) includes fixture base (41), and fixture base (41) is arranged on bottom plate (1),
Top of the clamping fixture seat (49) of clamp structure (102) end between the first rack gear (131) and the second rack gear (13), the first tooth
Item (131) is parallel with the second rack gear (13)；
Jig structure (100) includes fixed handwheel (24), and fixed handwheel (24) connection fixture adjustment screw (26), jig adjusts spiral shell
Bar (26) is arranged between two pieces of jig guide rod fixed blocks (25), and jig guide rod fixed block (25) is arranged in jig base (21)
On, jig adjustment screw (26) is equipped with two pieces of jig movable blocks (28), and two pieces of jig movable blocks (28) pass through jig guide rod
(27) it connects, each jig movable block (28) is equipped with a jig bar (29), is equipped with bolt (23) at the top of jig base (21)；It controls
Have pedestal (21) top and be equipped with stroke pointer (22), stroke pointer (22) is located at below jig bar (29)；
Jig guide rod fixed block (25) is arranged on jig base (21) by bolt (23), sets on jig guide rod fixed block (25)
Have adjustment screw (26), jig guide rod fixed block (25) is externally provided with jig shield (30), and adjustment screw (26) is connected and fixed handwheel
(24), jig bar (29) is arranged on jig movable block (28)；
First rack gear (131), the second rack gear (13) are equipped with clamp structure (102) far from the one end of eccentric wheel (2), clamp structure
It (102) include the second handwheel (46) that the second handwheel (46) connects the second adjusting screw rod (45), the second adjusting screw rod (45) setting exists
On fixture fixed block (42), fixture fixed block (42) is arranged on fixture base (41), and fixture base (41) is fixed at bottom
On plate (1)；Fixture fixed block (42) is equipped with the second guide rod (44), the one end of the second guide rod (44) far from fixture fixed block (42)
Equipped with the second guide rod fixed block (47), second adjustment screw rod is equipped between the second guide rod fixed block (47) and fixture fixed block (42)
(45), second adjustment screw rod (45) is equipped with the second movable block (43), and the second movable block (43) passes through two the second guide rods (44)
It is arranged on fixture fixed block (42), the second movable block (43) is equipped with clamping fixture seat (49), and clamping fixture seat (49) is equipped with third hand
It takes turns (48), is equipped with before clamping fixture seat (49) lower fixture block (51) and upper fixture block (50), upper fixture block (50) is right up and down with lower fixture block (51)
Claim setting, upper fixture block (50) connects third handwheel (48), and upper fixture block (50) and lower fixture block (51) form a clamping opening；Second adjusts spiral shell
Bar (45) connects the second handwheel (46) through the second guide rod fixed block (47) afterwards；
Eccentric wheel (2) is equipped with screw rod fixed block (3), and screw rod fixed block (3) is equipped with screw rod (5), and screw rod (5) is equipped with bias
Block (4), eccentric block (4) are equipped with connecting rod (6), and connecting rod (6) connects the first rack gear (131) far from the one end of eccentric block (4), and first
The jig base (21) of jig structure (100) is installed on rack gear (131), bottom plate (1) is equipped with gear (10), the first rack gear
(131) the second rack gear (13) are connected by the way that gear (10) tooth is dynamic, is installed with another set of jig structure (100) on the second rack gear (13)
Jig base (21)；Two sets of jig structures (100) are separately connected the first rack gear (131), the second rack gear (13)；On bottom plate (1)
Equipped with slide (11), slide (11) is equipped with slidable sliding rail (12), and sliding rail (12) both ends are equipped with limited block (14), sliding rail
(12) it is equipped with rack gear；
When eccentric wheel (2) rotates, eccentric block (4) slidably reciprocate on screw rod (5), to drive the round-trip fortune of connecting rod (6)
Dynamic, connecting rod (6) is driven the first rack gear (131), and the first rack gear (131) passes through gear (10) transmission the second rack gear (13), the first tooth
Item (131) makees opposite front and back with the second rack gear (13) and intersects movement, and drives the first rack gear (131), the second rack gear (13)
Two sets of jig structures (100) above also make opposite front and back crisscross motion；
Third hand when test, by earphone (104) upper clamp on earphone clamp structure (102), in adjustment clamping fixture seat (49)
It takes turns (48), so that clamp block is clamped earphone (104) top, the both sides of earphone (104) are each defined between two jig bars (29)；
According to the stroke to be distorted by adjusting the position of eccentric wheel (2), and then the moving range of rack gear is limited, finally controlled
Drawing numbers and speed are set on panel (65), starts to test by start button (15), are reached drawing numbers after table and are stopped fortune
It is dynamic, check whether earphone damages.
2. a kind of muffler earphone distortion testing device according to claim 1, which is characterized in that the understructure
It (103) include base member case (62) that base member case (62) is equipped with control panel (65), power outlet (63), panel (66), distribution
Above control panel (65), base member case (62) is equipped with upper sealing plate (67) for plate (66) setting, and upper sealing plate (67) is equipped with scale
Ruler (68), upper sealing plate (67) rear are equipped with pedestal rear cover (69), and upper sealing plate (67) one end is connected eccentric wheel shield (70), pedestal
There are four being set below case (62) horizontal adjustment foot (61).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610975349.6A CN106572424B (en) | 2016-11-07 | 2016-11-07 | A kind of muffler earphone distortion testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610975349.6A CN106572424B (en) | 2016-11-07 | 2016-11-07 | A kind of muffler earphone distortion testing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106572424A CN106572424A (en) | 2017-04-19 |
| CN106572424B true CN106572424B (en) | 2019-08-16 |
Family
ID=58540083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610975349.6A Expired - Fee Related CN106572424B (en) | 2016-11-07 | 2016-11-07 | A kind of muffler earphone distortion testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106572424B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108036885A (en) * | 2018-01-16 | 2018-05-15 | 歌尔股份有限公司 | Straw torque force testing tooling |
| CN108540919B (en) * | 2018-07-16 | 2020-07-17 | 铭宸(唐山)航天电子装备科技有限公司 | Intelligent testing system for embedded computer earphone and testing method of system |
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| CN102144829A (en) * | 2011-03-31 | 2011-08-10 | 东莞市恒宇仪器有限公司 | Bending fatigue testing machine for instep belt |
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| CN104359773A (en) * | 2014-10-24 | 2015-02-18 | 同济大学 | Tensile fatigue and torsional fatigue testing machine for automobile parts |
| CN204286950U (en) * | 2014-12-12 | 2015-04-22 | 上海斐讯数据通信技术有限公司 | A kind of wire test machine |
| CN204330318U (en) * | 2014-12-31 | 2015-05-13 | 东莞市景瑜实业有限公司 | The three-in-one test machine of a kind of luggage combination lock |
| CN204988909U (en) * | 2015-07-31 | 2016-01-20 | 西安科技大学 | Compound loading test machine of panel torsional bending |
| CN106341769A (en) * | 2016-10-13 | 2017-01-18 | 高铁检测仪器（东莞）有限公司 | Collar earphone stretching tester |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020073359A1 (en) * | 2000-09-08 | 2002-06-13 | Wade Jennifer A. | System and method for high priority machine check analysis |
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2016
- 2016-11-07 CN CN201610975349.6A patent/CN106572424B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102144829A (en) * | 2011-03-31 | 2011-08-10 | 东莞市恒宇仪器有限公司 | Bending fatigue testing machine for instep belt |
| CN203337445U (en) * | 2013-05-22 | 2013-12-11 | 东莞市中铭仪器技术服务有限公司 | Flexibility tester |
| CN104359773A (en) * | 2014-10-24 | 2015-02-18 | 同济大学 | Tensile fatigue and torsional fatigue testing machine for automobile parts |
| CN204286950U (en) * | 2014-12-12 | 2015-04-22 | 上海斐讯数据通信技术有限公司 | A kind of wire test machine |
| CN204330318U (en) * | 2014-12-31 | 2015-05-13 | 东莞市景瑜实业有限公司 | The three-in-one test machine of a kind of luggage combination lock |
| CN204988909U (en) * | 2015-07-31 | 2016-01-20 | 西安科技大学 | Compound loading test machine of panel torsional bending |
| CN106341769A (en) * | 2016-10-13 | 2017-01-18 | 高铁检测仪器（东莞）有限公司 | Collar earphone stretching tester |
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| CN106572424A (en) | 2017-04-19 |
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