CN112729696A

CN112729696A - Multi-station micro loudspeaker air tightness testing tool and using method

Info

Publication number: CN112729696A
Application number: CN202011604838.3A
Authority: CN
Inventors: 陈海良
Original assignee: Jiaxing Boenli Precision Machinery Co ltd
Current assignee: Jiaxing Boenli Precision Machinery Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-04-30

Abstract

The invention discloses a multi-station micro-speaker air tightness testing tool and a using method thereof. The device comprises a die carrier and is characterized in that a gas guide-in plate, a gas guide-in plate sealing ring, a test pressing plate, a silica gel plate and a silica gel plate fixing plate are sequentially and downwards arranged below a movable die plate, a plurality of sealing pressing pieces are arranged in the test pressing plate, an inner sealing convex rib is arranged on the front end surface of each sealing pressing piece, an outer sealing convex rib is arranged on the lower surface of the test pressing plate at the periphery of each sealing pressing piece, a first vent hole is arranged in each sealing pressing piece, a second vent hole is arranged on the silica gel plate, an air inlet hole and an air guide groove are arranged on each gas guide-in plate, an inner sealing convex rib for pressing the periphery of a front cover of a loudspeaker is arranged on the front end surface of each sealing pressing piece, a test turnover plate is arranged on the upper surface of the lower die plate, pits for placing the tested loudspeakers are arranged on the test turnover plate, the positions, the air leakage joint is connected with an air tightness tester.

Description

Multi-station micro loudspeaker air tightness testing tool and using method

Technical Field

The invention relates to performance test equipment of a loudspeaker, in particular to a multi-station micro loudspeaker airtightness test tool and a using method thereof.

Background

With the development of science and technology, the performance requirements for small and miniature loudspeakers are higher and higher. These small, miniature loudspeakers are sometimes tested for air tightness. The existing micro loudspeaker industry generally adopts a differential pressure type air tightness test method, a loudspeaker is placed on a cavity of a test tool in a downward mode through a sound outlet of a front cover as shown in figure 1, a silica gel ring is arranged between the front cover of the loudspeaker and the cavity, a linear air cylinder is arranged on the loudspeaker, a pressure head is arranged on an air cylinder piston rod, a pressure sensor is arranged in the middle of the pressure head, the sensor is connected with a pressure display, the air pressure of the air cylinder is adjusted through adjusting the air pressure, the test tool is matched with an air tightness tester, and the test state is shown in figure 2. The tester is internally provided with a standard cavity and a test cavity, and the test cavity is connected with the tool cavity. During testing, the air cylinder presses the loudspeaker with certain pressure, the tester injects gas with corresponding pressure into the tool testing cavity and the standard cavity according to the waterproof grade requirement of the loudspeaker, and when the pressure reaches balance, the differential pressure sensor is used for testing the leakage value of the tool testing cavity, so that the air tightness data of the loudspeaker is obtained. This method has several drawbacks: (1) the loudspeaker and the test cavity need to be reliably sealed by large pressure, so that the loudspeaker is easy to deform, and the correctness of a test result is influenced; (2) the testing efficiency is lower, and about 35 seconds are needed for testing one loudspeaker. These problems plague testing of the air tightness of the speaker and are still unsolved problems that manufacturers want to solve.

Disclosure of Invention

The invention aims to provide a multi-station micro-speaker airtightness test tool with simple structure, low manufacturing cost, high test speed and accurate test data and a use method thereof.

In order to solve the problems, the multi-station micro-speaker airtightness testing tool is realized by the following technical scheme: the device comprises an upper template, a movable template, a lower template and a die carrier of guide pillars, wherein the movable template is pushed by a cylinder arranged at the top of the upper template, and the device is characterized in that a gas guide plate, a gas guide plate sealing ring, a test pressing plate, a silica gel plate and a silica gel plate fixing plate for supporting the silica gel plate are sequentially arranged below the movable template downwards, a plurality of sealing pressing parts are arranged in the test pressing plate, an inner sealing convex rib is arranged on the front end surface of each sealing pressing part, an outer sealing convex rib is arranged on the lower surface of the test pressing plate arranged at the periphery of each sealing pressing part, a first vent hole is arranged in each sealing pressing part, a second vent hole communicated with the first vent hole is arranged on the silica gel plate, an air inlet hole and an air guide groove communicated with the first vent hole in each sealing pressing part are arranged on the gas guide plate, and an inner sealing convex rib for pressing the, the upper surface of the lower template is provided with a test turnover plate, the test turnover plate is provided with pits for placing the tested loudspeaker, the positions and the number of the pits correspond to the sealing pressing parts, the bottom of each pit is respectively provided with an air leakage joint, and the air leakage joint is connected with an air tightness tester for detecting whether air leakage exists or not.

And a template spring is sleeved on the guide post between the movable template and the lower template.

6-12 sealing pressing pieces arranged in an array are fixed in the test pressing plate.

Each sealing pressing piece is provided with a sunk pit, and a pressing piece spring is arranged between the sunk pit and the gas guide plate, so that the inner sealing convex rib on the sealing pressing piece is in a flexible compression state to the silica gel plate.

The thickness of the silica gel plate is 0.6-1.5 mm, and the Shore hardness is 20-50 degrees.

The rib width of the front ends of the outer sealing convex rib and the inner sealing convex rib is 0.3-0.8 mm, the height of the front ends of the outer sealing convex rib and the inner sealing convex rib is 0.4-1.0 mm, and the cone angle of the front ends of the outer sealing convex rib and the inner sealing convex rib is 30-60 degrees.

And a third vent hole is formed in the test turnover plate at the bottom of the pit and is communicated with a fourth vent hole in the lower template, and a gas leakage joint is fixed below or on the side surface of the lower template and is communicated with the fourth vent hole.

And an O-shaped sealing ring is arranged between the third vent hole and the fourth vent hole between the test turnover plate and the lower template.

And a piston rod of the air cylinder is connected with the movable template through a connecting plate.

Limiting bosses for limiting the downward movement of the test pressure plate are limited on the upper surfaces of the left end and the right end of the test turnover plate.

At least 2 test turnover plates are used alternately, and the operation of installing untested loudspeakers, testing the loudspeakers and removing tested loudspeakers is synchronously carried out.

And a raised bottom foot is arranged at the bottom of the die carrier.

The use method of the multi-station micro-speaker airtightness testing tool is characterized by comprising the following steps of: during testing, the front cover of the tested loudspeaker is upwards placed in each pit of the testing turnover plate, the testing turnover plate is placed on the lower template to be positioned, the button is started, the cylinder on the testing tool acts, the movable template and each component fixed on the movable template are moved downwards by the piston rod, when the lower surface of the testing pressing plate is tightly contacted with the limit boss on the testing turnover plate, the sharp inner sealing convex rib on the sealing pressing piece presses the front cover of the loudspeaker below the silica gel plate, the outer sealing convex rib on the testing pressing plate also presses the silica gel plate on the upper surface of the testing turnover plate on the periphery of the loudspeaker, the inner layer and the outer layer of sealing are implemented on the end surface of the loudspeaker, then compressed gas is inflated through the gas inlet hole of the gas guide plate, the compressed gas respectively enters the first vent hole of each sealing pressing piece through the gas guide groove and the second vent hole on the silica gel plate to reach the upper surface of the sound, if a certain loudspeaker leaks, the leaked gas passes through the loudspeaker, a third vent hole below a pit on the turnover plate is tested from the lower side of the loudspeaker, then the third vent hole and the gas leakage joint are connected, the gas leakage joint is connected into the gas tightness tester through a gas pipe, the gas tightness tester displays the loudspeaker leakage condition of the testing station, and the unqualified loudspeaker is tested according to the testing standard. During testing, the test turnover plate can adopt a plurality of blocks for recycling, and the synchronous operation of mounting the untested loudspeaker, testing the loudspeaker and dismounting the tested loudspeaker is realized. For testing speakers with different sealing grade requirements, compressed gas at corresponding pressure will be introduced.

The multi-station micro-speaker air tightness test tool manufactured according to the scheme mainly has the following advantages:

(1) the loudspeaker and the tool are sealed by a silica gel plate with the Shore hardness of 20-50 degrees and the thickness of 0.6-1.5 mm, a sealing component on the tool is a movable structure, a circle of thin inner sealing convex ribs are arranged corresponding to the front cover of the loudspeaker, and the pressure of the component on the silica gel plate is provided by a spring. Therefore, larger pressure intensity can be obtained by smaller pressure on the tapered inner sealing convex rib, and a good sealing effect is obtained; the outer sealing convex ribs also have the same effect, and the inner sealing convex ribs and the outer sealing convex ribs press the silica gel plate along with the downward movement of the movable template, so that the loudspeaker is tested in a rapidly formed closed environment. For the 1508 speaker test, the face seal pressure was only 3N.

(2) The tested loudspeaker is put on the movable turnover plate and then put into the testing tool to be tested, a plurality of loudspeakers can be tested at one time, if two turnover plates are used, 8 loudspeakers are put on each turnover plate, the operation is carried out simultaneously, the testing is only carried out for about 15 seconds once, the testing efficiency can be greatly improved, and if three turnover plates are used, the testing efficiency can be higher.

Drawings

Fig. 1 is a front view of a speaker;

FIG. 2 is a schematic structural diagram of a conventional loudspeaker airtightness testing tool;

FIG. 3 is a front view of the multi-station micro-speaker air-tightness test fixture of the present invention when tested;

FIG. 4 is a partial enlarged view of the area F in FIG. 3

FIG. 5 is an exploded front view of FIG. 3;

FIG. 6 is an exploded left side view of FIG. 3;

FIG. 7 is an exploded perspective view from the top left of FIG. 3;

FIG. 8 is an exploded perspective view from the bottom left of FIG. 3;

FIG. 9 is a perspective view of the blades;

FIG. 10 is a front view of the gas introduction plate;

FIG. 11 is a top view of FIG. 10;

fig. 12 is a perspective view of the gas introduction plate;

FIG. 13 is a front view of the test platen;

FIG. 14 is an enlarged view of a portion of the area A in FIG. 13;

FIG. 15 is a top view of FIG. 13;

FIG. 16 is a perspective view of FIG. 13;

FIG. 17 is an enlarged front view of the packing follower;

FIG. 18 is a left side view of FIG. 17;

FIG. 19 is an enlarged perspective view of the packing follower;

FIG. 20 is a front view of the test transfer plate;

FIG. 21 is a top view of FIG. 20;

FIG. 22 is a perspective view of a test transfer plate;

FIG. 23 is a front view of the multi-station micro-speaker air-tightness testing tool of the present invention during testing;

FIG. 24 is a partial enlarged view of area B of FIG. 23;

fig. 25 is a schematic structural view of the multi-station micro-speaker airtightness testing tool according to the present invention after being connected to an airtightness tester.

In the figure: 1. mounting a template; 2. a movable template; 3. a lower template; 4. a guide post; 5. a mold frame; 6. footing; 7. a column; 8. a template spring; 9. a cylinder; 10. a piston rod; 11. a connecting plate; 12. a gas introduction plate; 13. a gas introduction plate seal ring; 14. testing the pressing plate; 15. a silica gel plate; 16. a silica gel plate fixing plate; 17. a packing follower; 18. an inner sealing convex rib; 19. the outer sealing convex rib; 20. sinking a pit; a compression spring; 22. a speaker; 23. a first vent hole; 24. a second vent hole; 25. an air inlet; 26. a gas guide groove; 27. testing the turnover plate; 28. a pit; 29. a third vent hole; 30. a fourth vent hole; 31. an O-shaped sealing ring; 32. a limiting boss; a blow-by fitting; 34. an air tube; 35. air tightness tester.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

Fig. 3 to 8 are structural diagrams of a multi-station micro-speaker airtightness testing tool, and as seen from the diagrams, the tool comprises an upper template 1, a movable template 2, a lower template 3 and a die carrier 5 with

guide pillars

4, and 4 raised feet 6 are installed at the bottom of the die carrier 5. 4 upright posts 7 are arranged between the upper template 1 and the lower template 3. A template spring 8 is sleeved on the guide post 4 between the movable template 2 and the lower template 3. The top of the upper template 1 is provided with a cylinder 9, a piston rod 10 of the cylinder 9 is connected with the movable template 2 through a connecting plate 11, and the movable template 2 is pushed by the cylinder 9 to move up and down. A gas introduction plate 12 and a gas introduction plate packing 13 shown in fig. 10, 11 and 12, a test pressure plate 14 and a silicone plate 15 shown in fig. 13, 14, 15 and 16, and a silicone plate fixing plate 16 for holding the silicone plate 15 are sequentially mounted downward on the lower surface of the movable die plate 2 shown in fig. 9. The thickness of the silica gel plate 15 is 0.6-1.5 mm, and the Shore hardness is 20-50 degrees. The test platen 14 has embedded therein 8 packing followers 17 as shown in fig. 17, 18, 19, although the packing followers 17 may be selected as desired, typically between 6-12. The front end face of the sealing and pressing piece 17 is provided with an inner sealing convex rib 18, the lower surface of the test pressure plate 14 arranged on the periphery of the sealing and pressing piece 17 is provided with an outer sealing convex rib 19, the rib width B of the front ends of the outer sealing convex rib 19 and the inner sealing convex rib 18 is 0.3-0.8 mm, the height H is 0.4-1.0 mm, and the cone angle is 30-60 degrees. Each sealing pressing piece 17 is provided with a sunk pit 20, and a pressing piece spring 21 is arranged between the sunk pit 20 and the gas guide plate 12, so that the inner sealing convex rib 18 on the sealing pressing piece 17 is in a flexible compression state on the silica gel plate 15, and the sealing and pressing effect of the silica gel plate 15 on the loudspeaker 22 is achieved. Each sealing and pressing piece 17 is provided with a first vent hole 23, the silica gel plate 15 is provided with a second vent hole 24 communicated with the first vent hole 23, and the gas guide plate 12 is provided with a gas inlet hole 25 for connecting compressed gas and a gas guide groove 26 communicated with the first vent hole 23 in each sealing and pressing piece 17 through the gas inlet hole 25. A test turnover plate 27 shown in fig. 20, 21 and 22 is mounted on the upper surface of the lower template 3, the test turnover plate 27 is provided with pits 28 for placing the tested loudspeaker 22, the positions and the number of the pits 28 correspond to those of the sealing pressing pieces 17, a third vent hole 29 is formed in the test turnover plate 27 at the bottom of the pits 28, the third vent hole 29 is communicated with a fourth vent hole 30 in the lower template 3, and an O-shaped sealing ring 31 is mounted between the third vent hole 29 and the fourth vent hole 30 between the test turnover plate 27 and the lower template 3. Limiting bosses 32 limiting the downward movement of the test pressure plate 14 are formed on the upper surfaces of the left and right ends of the test transfer plate 27. An air leakage joint 33 is installed at a fourth air hole 30 of the lower template 3, and the air leakage joint 33 is connected with an air tightness tester 35 (in addition, the invention is used by matching with an eight-station air tightness tester NRJL-020-P0002-DP01-CH0108 of Hangzhou Nurong measurement and control technology Limited company) for detecting air leakage through an air pipe 34.

The use method of the multi-station micro-speaker airtightness test tool comprises the following steps: during testing, the front cover of the tested loudspeaker 22 is placed upwards into each pit 28 of the test turnover plate 27, the test turnover plate 27 is placed on the lower template 3 to be positioned, the button is started, the test tool is loaded with the air cylinder 9 to act, the piston rod 10 moves the movable template 2 and each component fixed on the movable template 2 downwards, when the lower surface of the test pressing plate 14 is in close contact with the limit boss 32 on the test turnover plate 27, as shown in fig. 23 and 24, the sharp inner sealing convex rib 18 on the sealing pressing piece 14 presses the front cover of the loudspeaker 22 below the silica gel plate 15, the outer sealing convex rib 19 on the test pressing plate 14 also presses the silica gel plate 15 on the upper surface of the peripheral test turnover plate 14 of the loudspeaker 22, and the end surface of the loudspeaker 22 is sealed by two layers of inner and outer. Then the compressed air is inflated through the air inlet 25 of the air introducing plate 12, the compressed air enters the first vent hole 23 of each sealing and pressing member 17 and the second vent hole 24 of the silicon rubber plate 15 through the air guiding groove 26 respectively to reach the upper surface of the sound outlet hole of the front cover of each loudspeaker 22, if a certain loudspeaker 22 leaks, the leaked air passes through the loudspeaker 22, the third vent hole 29 below the pit 28 on the test revolving plate 27 below the loudspeaker 22 is tested, and then the fourth vent hole 30 and the air leakage joint 33 are connected to the air tightness tester 35 through the air pipe 34, as shown in fig. 25, the air tightness tester displays the leakage condition of the loudspeaker at the test station, and the unqualified loudspeaker 22 is tested according to the test standard. During testing, one tester selects 3 test turnover plates 27 for alternate use, so as to realize synchronous operation of loading untested loudspeakers 22, testing loudspeakers 22 and unloading tested loudspeakers 22. For testing speakers 22 for different seal grade requirements, compressed gas at the corresponding pressure will be introduced. The testing tool is matched with an eight-station air tightness tester NRJL-020-P0002-DP01-CH0108 of Hangzhou Nuronglong measurement and control technology company Limited for use.

It should be understood that the above examples are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. All changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. A multi-station micro loudspeaker air tightness test tool comprises an upper template, a movable template, a lower template and a die carrier of guide pillars, wherein the movable template is pushed by an air cylinder arranged at the top of the upper template, and is characterized in that a gas guide plate, a gas guide plate sealing ring, a test pressing plate, a silica gel plate and a silica gel plate fixing plate for supporting the silica gel plate are sequentially arranged below the movable template downwards, a plurality of sealing pressing parts are arranged in the test pressing plate, an inner sealing convex rib is arranged on the front end surface of each sealing pressing part, an outer sealing convex rib is arranged on the lower surface of the test pressing plate on the periphery of each sealing pressing part, a first vent hole is arranged in each sealing pressing part, a second vent hole communicated with the first vent hole is arranged on the silica gel plate, an air inlet hole and an air guide groove communicated with the first vent hole in each sealing pressing part are arranged on the gas guide plate, and an inner sealing convex rib for pressing the periphery, the upper surface of the lower template is provided with a test turnover plate, the test turnover plate is provided with pits for placing the tested loudspeaker, the positions and the number of the pits correspond to the sealing pressing parts, the bottom of each pit is respectively provided with an air leakage joint, and the air leakage joint is connected with an air tightness tester for detecting whether air leakage exists or not.

2. The air tightness test tool for the multi-station micro loudspeaker according to claim 1, wherein a template spring is sleeved on the guide post between the movable template and the lower template.

3. The air tightness test tool for the multi-station micro-speaker as claimed in claim 1, wherein 6-12 packing press pieces arranged in an array are fixed in the test press plate.

4. The multi-station micro-speaker airtightness testing tool according to claim 1, wherein each of the packing press pieces is provided with a pit, and a press piece spring is installed between the pit and the gas introduction plate, so that an inner sealing convex rib on the packing press piece is in a flexible compression state with respect to the silicone plate.

5. The air tightness test tool for the multi-station micro loudspeaker according to claim 1, wherein the thickness of the silica gel plate is 0.6-1.5 mm, and the shore hardness is 20-50 degrees.

6. The multi-station micro-speaker airtightness test tool according to claim 1, wherein the rib width at the front end of the outer sealing rib and the rib width at the front end of the inner sealing rib are 0.3-0.8 mm, the height is 0.4-1.0 mm, and the taper angle is 30-60 degrees.

7. The air tightness test tool for the multi-station micro-speaker as claimed in claim 1, wherein a third vent hole is formed in the test turnaround plate at the bottom of the concave pit, the third vent hole is communicated with a fourth vent hole in the lower template, and the air leakage joint is fixed below or on the side surface of the lower template and is communicated with the fourth vent hole.

8. The air tightness test tool for the multi-station micro loudspeaker according to claim 1, wherein an O-shaped sealing ring is arranged between a third vent hole and a fourth vent hole between the test turnover plate and the lower template.

9. The multi-station micro-speaker airtightness testing tool according to claim 1, wherein the piston rod of the cylinder is connected with the movable template through a connecting plate.

10. The air tightness test fixture of a multi-station micro speaker as claimed in claim 1, wherein limiting bosses for limiting the downward movement of the test pressure plate are formed on the upper surfaces of the left and right ends of the test turnaround plate.

11. The multi-station micro-speaker airtightness test tool according to claim 1, wherein the test turnaround plates are provided with at least 2 pieces, which are used alternately, so as to realize synchronous operation of loading untested speakers, testing speakers and unloading tested speakers.

12. The use method of the multi-station micro-speaker airtightness testing tool is characterized by comprising the following steps of: during testing, the front cover of the tested loudspeaker is upwards placed in each pit of the testing turnover plate, the testing turnover plate is placed on the lower template to be positioned, the button is started, the cylinder on the testing tool acts, the movable template and each component fixed on the movable template are moved downwards by the piston rod, when the lower surface of the testing pressing plate is tightly contacted with the limit boss on the testing turnover plate, the sharp inner sealing convex rib on the sealing pressing piece presses the front cover of the loudspeaker below the silica gel plate, the outer sealing convex rib on the testing pressing plate also presses the silica gel plate on the upper surface of the testing turnover plate on the periphery of the loudspeaker, the inner layer and the outer layer of sealing are implemented on the end surface of the loudspeaker, then compressed gas is inflated through the gas inlet hole of the gas guide plate, the compressed gas respectively enters the first vent hole of each sealing pressing piece through the gas guide groove and the second vent hole on the silica gel plate to reach the upper surface of the sound, if a certain loudspeaker leaks, the leaked gas passes through the loudspeaker, a third vent hole below a pit on the turnover plate is tested from the lower side of the loudspeaker, then the third vent hole and the gas leakage joint are connected, the gas leakage joint is connected into the gas tightness tester through a gas pipe, the gas tightness tester displays the loudspeaker leakage condition of the testing station, and the unqualified loudspeaker is tested according to the testing standard.