Sound cavity air tightness detection device of acoustic element

Abstract

The invention relates to the technical field of electronic component detection, in particular to a sound cavity air tightness detection device of an acoustic component. The invention aims to solve the technical problems that when an existing sound cavity air tightness detection device of an acoustic element is used for detection, the sealing performance of a detection mold is difficult to ensure, so that air leakage is easy to occur at a mold seam, the accuracy of a detection result is influenced, a sound cavity leakage point of the acoustic element is generally small, and the existing sound cavity air tightness detection device of the acoustic element cannot ensure the sealing performance of the detection mold. In the prior art, an acoustic element is inconvenient to properly press, so that the time for detecting a small air leakage point is long, and the efficiency is low. A sound cavity air tightness detection device of an acoustic element comprises a base; and the mounting frame is fixedly connected to the base. The protrusions on the wave-shaped strips can repeatedly extrude the rotating wheel, the upper cover, the containing box and the acoustic element are made to shake under the action of the third compression spring, the actual working condition of the acoustic element is simulated, and therefore potential leakage is detected.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic component detection, and particularly to an airtightness detection device for the sound cavity of an acoustic component. Background Art

[0002] The airtightness of the sound cavity of an acoustic component has an important impact on its acoustic performance. The airtightness of the sound cavity is directly related to the quality of the acoustic component. If there is air leakage or poor sealing in the sound cavity, it will lead to a decline in acoustic performance. Therefore, in the design and production process of acoustic components, it is necessary to detect the airtightness of the sound cavity of acoustic components. When detecting the airtightness of the sound cavity of acoustic components, static air pressure testing is usually carried out manually to achieve the purpose of detecting whether the airtightness of the sound cavity of acoustic components is qualified.

[0003] Since there may be a situation where the detection mold is insufficiently sealed after pressurization during detection, and the existing airtightness detection device is difficult to ensure the sealing of the detection mold when detecting acoustic components, resulting in easy air leakage at the mold joint, affecting the accuracy of the detection result. Moreover, the leakage points of the sound cavity of acoustic components are usually small, and the existing airtightness detection device is not convenient to moderately press the diaphragm of the acoustic component during detection, resulting in a long time for detecting small leakage points, thereby reducing the detection efficiency. Summary of the Invention

[0004] In order to overcome the above drawbacks, the present invention provides an airtightness detection device for the sound cavity of an acoustic component, which can strengthen the sealing of the detection mold to ensure complete sealing of the sound cavity during the detection process, thereby enhancing the accuracy of the detection result, and can shake the mold and the acoustic component to accelerate gas flow, thereby improving the detection efficiency.

[0005] The technical solution is as follows: An airtightness detection device for the sound cavity of an acoustic component, comprising:

[0006] A base;

[0007] A mounting frame fixedly connected to the base;

[0008] A lifting assembly disposed on the base;

[0009] An upper cover disposed on the lifting assembly;

[0010] A placement box slidably connected to the base;

[0011] A sealing ring disposed on the placement box;

[0012] A detection mechanism for performing pressurization detection, disposed on the mounting frame and the upper cover;

[0013] A sealing mechanism for ensuring sealing, disposed on the mounting frame and the upper cover.

[0014] As a further preferred solution, the lifting assembly includes: a cylinder fixedly connected to the base; a lifting plate fixedly connected to the telescopic rod of the cylinder; a sliding plate slidably connected to the lifting plate; a sliding member slidably connected to the sliding plate; a first compression spring connected between the sliding plate and the sliding member; and an upper cover fixedly connected to the sliding member.

[0015] As a further preferred solution, the detection mechanism includes: a gas pump fixedly connected to the mounting frame; an air supply pipe provided on the gas pump; a buffer tank fixedly connected to the mounting frame, and the buffer tank is communicated with the air supply pipe; an air delivery pipe is communicated between the buffer tank and the upper cover; solenoid valves are respectively provided on the air supply pipe and the air delivery pipe; a pressure gauge provided on the upper cover, a pressure relief valve provided on the upper cover, and a valve plate is provided on the pressure relief valve.

[0016] As a further preferred solution, an acoustic component is placed in the placement box.

[0017] As a further preferred solution, the sealing mechanism includes: a slide rail fixedly connected to the mounting frame; two guide rails fixedly connected to the upper cover; two moving plates are respectively slidably connected to the two guide rails, and both of the two moving plates are slidably connected to the slide rail; sealing plates are respectively fixedly connected to the two moving plates.

[0018] As a further preferred solution, there is also a pressing mechanism for pressing the acoustic component. The pressing mechanism includes: an electric push rod fixedly connected to the top of the upper cover, and the telescopic end of the electric push rod passes through the upper cover; a connecting member fixedly connected to the telescopic end of the electric push rod; a sliding ring slidably connected to the connecting member; and a second compression spring connected between the sliding ring and the connecting member.

[0019] As a further preferred solution, there is also a shaking mechanism for shaking the placement box. The shaking mechanism includes: a moving rod fixedly connected to the bottom of the sliding plate, a runner rotatably connected to the moving rod; a corrugated strip fixedly connected to the mounting frame, and a reset assembly provided on the base.

[0020] As a further preferred solution, the reset assembly includes: a sleeve fixedly connected to the base; a connecting rod slidably connected to the sleeve; and a third compression spring connected between the sleeve and the connecting rod.

[0021] As a further preferred solution, there is also a buffer assembly for buffering. The buffer assembly includes: a buffer pad provided on the inner wall of the placement box.

[0022] As a further preferred solution, there is also a temperature control assembly for controlling the temperature. The temperature control assembly includes: a temperature sensor provided on the inner wall of the upper cover; a temperature control wire provided on the inner wall of the upper cover.

[0023] The present invention has the following advantages: 1. The cavity between the upper cover and the placement box is in a stable pressure state. At the same time, the telescopic rod of the cylinder continues to retract a certain distance, the lifting plate and the sliding plate continue to move downward a certain distance, and the first compression spring is compressed. After waiting for a period of time, if there is a leak in the sound cavity, the pointer of the pressure gauge will change. If the airtightness is good, the pressure will remain stable, thereby detecting the airtightness of the sound cavity of the acoustic component; when the upper cover is docked with the placement box, the two sealing plates will cover and seal the joint between the upper cover and the placement box, enhancing the sealing between the upper cover and the placement box and preventing leakage between the upper cover and the placement box, thus improving the accuracy of detection.

[0024] 2. When the telescopic end of the electric push rod contracts, it will drive the sliding ring to reset through the connecting piece, and under the action of the second compression spring, it will buffer the pressing force, so that for acoustic components with insufficient airtightness, the speed of gas discharging from the sound cavity can be increased, thereby improving the detection efficiency of the airtightness of the acoustic component.

[0025] 3. While the sliding plate continues to move downward, the protrusions on the waveform strip will repeatedly squeeze the rotating wheel, and under the action of the third compression spring, the upper cover and the placement box will shake after docking, and the acoustic component will shake in the placement box, simulating the actual working conditions of the acoustic component, thereby detecting potential leaks. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional structure diagram of the present invention.

[0027] Figure 2 is a three-dimensional structure diagram of the base and the mounting bracket of the present invention.

[0028] Figure 3 is a partial three-dimensional structure diagram of the present invention.

[0029] Figure 4 is a partial disassembled three-dimensional structure diagram of the present invention.

[0030] Figure 5 is a three-dimensional structure diagram of the detection mechanism of the present invention.

[0031] Figure 6 is a partial cross-sectional three-dimensional structure diagram of the present invention.

[0032] Figure 7 is a three-dimensional structure diagram of the sealing mechanism of the present invention.

[0033] Figure 8 is a cross-sectional three-dimensional structure diagram of the pressing mechanism of the present invention.

[0034] Figure 9 is a three-dimensional structure diagram of the shaking mechanism of the present invention.

[0035] Figure 10 This is a partially disassembled three-dimensional structural schematic diagram of the jitter mechanism of the present invention.

[0036] Figure 11 This is a three-dimensional structural schematic diagram of the buffer component of the present invention.

[0037] Figure 12 This is a three-dimensional structural schematic diagram of the temperature control component of the present invention.

[0038] Wherein: 0 - acoustic element, 1 - base, 2 - mounting bracket, 3 - cylinder, 4 - lifting plate, 5 - sliding plate, 6 - sliding member, 7 - first compression spring, 8 - upper cover, 9 - placement box, 91 - sealing ring, 10 - detection mechanism, 101 - air pump, 102 - air supply pipe, 103 - buffer tank, 104 - solenoid valve, 105 - gas transmission pipe, 106 - pressure gauge, 107 - pressure relief valve, 1071 - valve plate, 11 - sealing mechanism, 111 - slide rail, 112 - guide rail, 113 - moving plate, 114 - sealing plate, 12 - pressing mechanism, 121 - electric push rod, 122 - connecting member, 123 - sliding ring, 124 - second compression spring, 13 - jitter mechanism, 131 - moving rod, 1311 - runner, 132 - corrugated strip, 133 - reset assembly, 1331 - sleeve, 1332 - connecting rod, 1333 - third compression spring, 14 - buffer component, 141 - buffer pad, 15 - temperature control component, 151 - temperature sensor, 152 - temperature control wire. Specific Embodiments

[0039] The following further illustrates the technical solution with specific embodiments. It should be noted that: The words indicating directions such as up, down, left, and right in this text are only for the positions of the shown structures in the corresponding drawings. The serial numbers assigned to the components in this text, such as: first, second, etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And as used in this application: connection, coupling, unless otherwise specified, both include direct and indirect connection (coupling).

[0040] Embodiment 1: An airtightness detection device for the sound cavity of an acoustic element, as Figures 1 - 12 shown, includes:

[0041] Base 1;

[0042] Mounting bracket 2 fixedly connected to base 1;

[0043] Lifting assembly provided on base 1;

[0044] Upper cover 8 provided on the lifting assembly;

[0045] Placement box 9 slidably connected to base 1;

[0046] Sealing ring 91 provided on placement box 9;

[0047] The detection mechanism 10 is used for performing pressure detection and is provided on the mounting frame 2 and the upper cover 8;

[0048] The sealing mechanism 11 is used to ensure sealing and is provided on the mounting frame 2 and the upper cover 8.

[0049] The lifting assembly includes: a cylinder 3 fixedly connected to the base 1; a lifting plate 4 fixedly connected to the telescopic rod of the cylinder 3; a sliding plate 5 slidably connected to the lifting plate 4; a sliding member 6 slidably connected to the sliding plate 5; a first compression spring 7 connected between the sliding plate 5 and the sliding member 6; and the upper cover 8 is fixedly connected to the sliding member 6.

[0050] The detection mechanism 10 includes: an air pump 101 fixedly connected to the mounting frame 2; an air delivery pipe 102 provided on the air pump 101; a buffer tank 103 fixedly connected to the mounting frame 2, the buffer tank 103 is communicated with the air delivery pipe 102, and the buffer tank 103 is used for temporarily storing gas; an air delivery pipe 105 is communicated between the buffer tank 103 and the upper cover 8; solenoid valves 104 are respectively provided on the air delivery pipe 102 and the air delivery pipe 105; a pressure gauge 106 provided on the upper cover 8, a pressure relief valve 107 provided on the upper cover 8, and a valve plate 1071 is provided on the pressure relief valve 107.

[0051] The acoustic component 0 is placed in the placement box 9.

[0052] The sealing mechanism 11 includes: a slide rail 111 fixedly connected to the mounting frame 2; two guide rails 112 fixedly connected to the upper cover 8, and the two guide rails 112 are symmetrically arranged; moving plates 113 are respectively slidably connected to the two guide rails 112, and the two moving plates 113 are both slidably connected to the slide rail 111; sealing plates 114 are respectively fixedly connected to the two moving plates 113, and the sealing plates 114 are used to wrap the joint of the upper cover 8 and the placement box 9 to enhance sealing.

[0053] It further includes a temperature control assembly 15 for controlling temperature, and the temperature control assembly 15 includes: a temperature sensor 151 provided on the inner wall of the upper cover 8; a temperature control wire 152 provided on the inner wall of the upper cover 8.

[0054] At first, the solenoid valve 104 on the air supply pipe 102 is in the closed state, and the solenoid valve 104 on the air delivery pipe 105 is in the open state. When it is necessary to perform an airtightness test on the sound cavity of the acoustic component 0, the staff first place the acoustic component 0 in the placement box 9. Subsequently, the staff control the telescopic rod of the cylinder 3 to retract. The retraction of the telescopic rod of the cylinder 3 will drive the upper cover 8 to move downward through the lifting plate 4, the sliding plate 5 and the sliding member 6. The downward movement of the upper cover 8 will dock with the placement box 9. After the upper cover 8 is docked with the placement box 9, the staff start the air pump 101. The air pump 101 will pump the gas through the air delivery pipe 105 into the buffer tank 103, so that a negative pressure is formed between the upper cover 8 and the placement box 9, and the diaphragm of the acoustic component 0 will bulge to a certain extent accordingly. Subsequently, the solenoid valve 104 on the air delivery pipe 105 is closed, and the solenoid valve 104 on the air supply pipe 102 is opened. The gas in the cavity between the upper cover 8 and the placement box 9 will flow into the buffer tank 103 through the air delivery pipe 105. The staff record the pressure gauge 106. Subsequently, the value of the pressure gauge 106 tends to be stable, and the cavity between the upper cover 8 and the placement box 9 is in a pressure-stabilized state. At the same time, the telescopic rod of the cylinder 3 continues to retract a certain distance, the lifting plate 4 and the sliding plate 5 continue to move downward a certain distance, and the first compression spring 7 is compressed. After waiting for a period of time, if there is a leak in the sound cavity, the bulge of the diaphragm of the acoustic component 0 will gradually disappear, and the value of the pressure gauge 106 will change. If the airtightness is good, the pressure will remain stable, and the diaphragm of the acoustic component 0 will remain bulged. Thus, an airtightness test is performed on the sound cavity of the acoustic component 0. After the test is completed, the staff open the pressure relief valve 107 and control the telescopic rod of the cylinder 3 to extend. The negative pressure between the upper cover 8 and the placement box 9 disappears, and the diaphragm of the acoustic component 0 returns accordingly. At the same time, the value of the pressure gauge 106 returns. The lifting plate 4 and the sliding plate 5 first move upward, and the first compression spring 7 returns to its original position. The continuous upward movement of the lifting plate 4 and the sliding plate 5 will drive the upper cover 8 to reset upward through the sliding member 6. After the reset is completed, the staff can take out the acoustic component 0; when the upper cover 8 moves downward, it will drive the two guide rails 112 to move downward at the same time. The downward movement of the two guide rails 112 will squeeze the two moving plates 113 to slide on the slide rail 111 in the direction of approaching each other. While the two moving plates 113 approach each other, they will drive the two sealing plates 114 to approach each other. When the upper cover 8 is docked with the placement box 9, the two sealing plates 114 will cover and seal the joint between the upper cover 8 and the placement box 9, thereby enhancing the sealing performance between the upper cover 8 and the placement box 9, and thus preventing leakage between the upper cover 8 and the placement box 9, which may affect the accuracy of the test. When the upper cover 8 resets upward, it will drive the two guide rails 112 to reset upward. The upward reset of the guide rail 112 will squeeze the two moving plates 113 to reset in the direction of moving away from each other. The reset of the moving plate 113 will drive the sealing plate 114 to reset. Just wait for the reset to be completed;When in a voltage-stabilized state, the temperature sensor 151 detects the air temperature inside the cavity, and the temperature control wire 152 adjusts the air temperature accordingly, thereby controlling the detection environment within the standard range and avoiding interference from external factors on the detection results.

[0055] Embodiment 2: Based on Embodiment 1, as Figures 1 - 11 shown:

[0056] It further includes a pressing mechanism 12 for pressing the acoustic element 0. The pressing mechanism 12 includes: an electric push rod 121 fixedly connected to the top of the upper cover 8, and the telescopic end of the electric push rod 121 passes through the upper cover 8; a connecting member 122 fixedly connected to the telescopic end of the electric push rod 121; a sliding ring 123 slidably connected to the connecting member 122; a second compression spring 124 is connected between the sliding ring 123 and the connecting member 122, and the second compression spring 124 is used to buffer the pressure.

[0057] It further includes a shaking mechanism 13 for shaking the placement box 9. The shaking mechanism 13 includes: a moving rod 131 fixedly connected to the bottom of the sliding plate 5, and a runner 1311 is rotatably connected to the moving rod 131; a corrugated strip 132 fixedly connected to the mounting bracket 2, and the corrugated strip 132 is used to squeeze the runner 1311 to make the moving rod 131 move; a reset assembly 133 provided on the base 1.

[0058] The reset assembly 133 includes: a sleeve 1331 fixedly connected to the base 1; a connecting rod 1332 slidably connected to the sleeve 1331; a third compression spring 1333 is connected between the sleeve 1331 and the connecting rod 1332.

[0059] It further includes a buffer assembly 14 for buffering. The buffer assembly 14 includes: a buffer pad 141 provided on the inner wall of the placement box 9, and the buffer pad 141 is used to buffer the acoustic element 0.

[0060] When the cavity between the upper cover 8 and the placement box 9 is in a stable pressure state, the staff controls the telescopic end of the electric push rod 121 to repeatedly extend and retract. When the telescopic end of the electric push rod 121 extends, it will drive the sliding ring 123 to move downward through the connecting piece 122. When the sliding ring 123 moves downward, it will contact and press the vibrating diaphragm of the bulged acoustic component 0. When the telescopic end of the electric push rod 121 retracts, it will drive the sliding ring 123 to reset through the connecting piece 122, and the pressing force will be buffered under the action of the second compression spring 124. Furthermore, for the acoustic component 0 with insufficient airtightness, the speed of gas discharging from the sound cavity can be increased, thereby improving the detection efficiency of the airtightness of the acoustic component; while the sliding plate 5 moves downward, it will drive the moving rod 131 to move downward. While the sliding plate 5 continues to move downward, it will drive the moving rod 131 to continue to move downward. While the moving rod 131 continues to move downward, the protrusion on the waveform bar 132 will first squeeze the runner 1311, causing the moving rod 131 to move to one side. While the moving rod 131 moves to one side, it will drive the upper cover 8 and the placement box 9 to move to one side through the sliding plate 5 and the sliding part 6, and the third compression spring 1333 is compressed. Subsequently, the protrusion on the waveform bar 132 no longer squeezes the runner 1311, and the reset of the third compression spring 1333 will drive the upper cover 8 and the placement box 9 to reset. Repeat this way. While the sliding plate 5 continues to move downward, the protrusion on the waveform bar 132 will repeatedly squeeze the runner 1311. Under the action of the third compression spring 1333, the upper cover 8 and the placement box 9 will shake after docking, and the acoustic component 0 will shake in the placement box 9, simulating the actual working conditions of the acoustic component, so as to detect potential leaks. After the detection is completed, the upward reset of the sliding plate 5 will drive the moving rod 131 to reset upward, and the protrusion on the waveform bar 132 no longer squeezes the runner 1311. Wait until the moving rod 131 resets to the initial position; while the acoustic component 0 shakes in the placement box 9, the buffer pad 141 will buffer the acoustic component 0, thereby preventing damage to the acoustic component 0.

[0061] Although the present disclosure has been shown and described with reference to specific exemplary embodiments thereof, those skilled in the art should understand that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Therefore, the scope of the present disclosure should not be limited to the above embodiments, but should be determined not only by the appended claims but also by the equivalents of the appended claims.

Claims

1. A device for detecting the air tightness of a sound cavity of an acoustic element, characterized in that: include: A base (1); a mounting frame (2) fixedly connected to the base (1); A lifting assembly disposed on the base (1); An upper cover (8) disposed on the lifting assembly; A placement box (9) slidably connected to the base (1); A sealing ring (91) provided on the placement box (9); A detection mechanism (10) is arranged on the mounting frame (2) and the upper cover (8); The sealing mechanism (11) is arranged on the mounting frame (2) and the upper cover (8).

2. The device for detecting air tightness of a sound cavity of an acoustic element according to claim 1, characterized in that: The lifting assembly comprises: a cylinder (3) fixedly connected to a base (1); a lifting plate (4) fixedly connected to a telescopic rod of the cylinder (3); a sliding plate (5) slidably connected to the lifting plate (4); a sliding member (6) slidably connected to the sliding plate (5); a first compression spring (7) connected between the sliding plate (5) and the sliding member (6); and an upper cover (8) fixedly connected to the sliding member (6).

3. The device for detecting air tightness of a sound cavity of an acoustic element according to claim 1, characterized in that: The detection mechanism (10) comprises: an air pump (101) fixedly connected to the mounting frame (2); an air supply pipe (102) arranged on the air pump (101); a buffer tank (103) fixedly connected to the mounting frame (2), the buffer tank (103) being connected to the air supply pipe (102); an air supply pipe (105) being connected between the buffer tank (103) and the upper cover (8); solenoid valves (104) being respectively arranged on the air supply pipe (102) and the air supply pipe (105); a pressure gauge (106) arranged on the upper cover (8), and a pressure relief valve (107) arranged on the upper cover (8), the pressure relief valve (107) being provided with a valve plate (1071).

4. The device for detecting air tightness of a sound cavity of an acoustic element according to claim 3, characterized in that: An acoustic element (0) is placed in the placement box (9).

5. The device for detecting air tightness of a sound cavity of an acoustic element according to claim 4, characterized in that: The sealing mechanism (11) comprises: a slide rail (111) fixedly connected to the mounting frame (2); two guide rails (112) fixedly connected to the upper cover (8); movable plates (113) are respectively slidably connected to the two guide rails (112), and the two movable plates (113) are both slidably connected to the slide rail (111); and sealing plates (114) are respectively fixedly connected to the two movable plates (113).

6. The device for detecting air tightness of a sound cavity of an acoustic element according to claim 5, characterized in that: The invention also includes a pressing mechanism (12) for pressing the acoustic element (0), wherein the pressing mechanism (12) includes: an electric push rod (121) fixedly connected to the top of the upper cover (8), the telescopic end of the electric push rod (121) passing through the upper cover (8); a connecting piece (122) fixedly connected to the telescopic end of the electric push rod (121); a sliding ring (123) slidably connected to the connecting piece (122); and a second compression spring (124) connected between the sliding ring (123) and the connecting piece (122).

7. The device for detecting air tightness of a sound cavity of an acoustic element according to claim 6, characterized in that: The invention also comprises a shaking mechanism (13) for shaking the placement box (9), the shaking mechanism (13) comprising: a moving rod (131) fixedly connected to the bottom of the sliding plate (5), a rotating wheel (1311) being rotatably connected to the moving rod (131); a corrugated strip (132) fixedly connected to the mounting frame (2), and a reset assembly (133) arranged on the base (1).

8. The device for detecting air tightness of a sound cavity of an acoustic element according to claim 7, characterized in that: The reset assembly (133) comprises: a sleeve (1331) fixedly connected to the base (1); a connecting rod (1332) slidably connected to the sleeve (1331); and a third compression spring (1333) connected between the sleeve (1331) and the connecting rod (1332).

9. The device for detecting air tightness of a sound cavity of an acoustic element according to claim 7, characterized in that: It also includes a buffer component (14) for buffering, and the buffer component (14) includes a buffer pad (141) arranged on the inner wall of the placement box (9).

10. The device for detecting air tightness of a sound cavity of an acoustic element according to claim 9, characterized in that: It also includes a temperature control component (15) for controlling the temperature, and the temperature control component (15) includes: a temperature sensor (151) provided on the inner wall of the upper cover (8); and a temperature control wire (152) provided on the inner wall of the upper cover (8).

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