A loudspeaker airtightness detection device

Abstract

This utility model discloses a loudspeaker airtightness testing device, including a testing base, a testing seat, and a sealing head. The testing base has a slide rail seat, a drive cylinder, and a shaft seat inside, and the clamping force is amplified through a connecting rod and a three-section elbow assembly. The sealing head moves vertically along the internal sliding guide structure of the testing base, and its bottom has a sealing ring and a suction channel to form an upper sealed cavity with the top of the loudspeaker. The testing seat surface has a mating groove and a tooling groove. During testing, the drive cylinder drives the elbow assembly to push the sealing head down, simultaneously establishing the upper and lower sealing interfaces. A negative pressure is formed through the suction channel, and the air pressure change below the loudspeaker is monitored in real time using an air pressure detection hole to determine the loudspeaker's airtightness. This device has advantages such as reliable sealing, high clamping force, high testing accuracy, and convenient operation, and is suitable for rapid airtightness testing during loudspeaker production.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing technology, specifically to a loudspeaker airtightness testing device. Background Technology

[0002] As an acoustic device, the airtightness of the loudspeaker's internal cavity directly affects the stability of sound pressure output, frequency response consistency, and overall reliability. Therefore, airtightness testing is usually required before the finished loudspeaker rolls off the production line. Existing loudspeaker airtightness testing methods mainly fall into two categories: one is the manual pressure-sealing negative pressure sampling method, where the loudspeaker is placed in a testing fixture, and the testing personnel manually press the sealing cap to create negative pressure using an external air pump to monitor for leaks inside the loudspeaker; the other is the fixed pressure plate mechanical testing method, where a cylinder or pressure plate directly presses down on the sealing gasket, causing the loudspeaker to undergo suction testing within the sealed cavity.

[0003] However, the existing detection methods generally have the following drawbacks: First, manual clamping is greatly affected by the operator's strength and position. Uneven clamping force leads to changes in the sealing interface gap, thus affecting the negative pressure suction effect and resulting in poor repeatability of the test results. Second, traditional mechanical clamping plates usually adopt a rigid linear drive structure, which is prone to tilting or localized stress when clamping the speaker, resulting in uneven contact of the sealing gasket and causing false leak detection. Third, existing sealing heads and detection seats mostly adopt a single sealing interface structure, which is not sensitive to changes in air pressure when there is a slight leak in the speaker cavity, and the detection accuracy is difficult to meet the stringent requirements of small speakers or high-performance speakers.

[0004] In addition, some existing devices, although using cylinders to provide clamping force, lack pressure amplification mechanisms, making the sealing effect dependent on the cylinder output itself. This makes it difficult to obtain sufficient clamping force in a limited installation space, especially in mass production environments where incomplete sealing and drifting test results are likely to occur, affecting production consistency.

[0005] In summary, existing loudspeaker airtightness testing technologies still suffer from problems such as unstable clamping structures, susceptibility of sealing effects to human factors, and insufficient testing accuracy. There is an urgent need for a new type of airtightness testing device with a stable structure, amplifiable clamping force, and reliable sealing interface to improve testing accuracy and equipment automation. Utility Model Content

[0006] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0007] Therefore, the technical solution adopted by this utility model is: a loudspeaker airtightness testing device, which solves the technical problems existing in the current loudspeaker airtightness testing equipment, such as unstable sealing, insufficient clamping force, low negative pressure detection accuracy, and unreliable structural alignment. Existing technologies generally suffer from uneven sealing due to manual clamping, misjudgment of leakage due to the tendency of a single pressure plate structure to tilt, and the inability to obtain sufficient clamping force within a limited space, making it difficult to meet the requirements of modern loudspeaker production for high precision, stability, and automation.

[0008] To overcome the above shortcomings, this utility model proposes a loudspeaker airtightness testing device. It constructs upper and lower double-sealed cavities through a linkage mechanism between the testing base, the testing seat and the sealing pressure head, and uses a drive cylinder and elbow amplification mechanism to generate a stable clamping force, so that the loudspeaker maintains a reliable seal throughout the test, thereby improving the accuracy and repeatability of airtightness testing.

[0009] This utility model provides a loudspeaker airtightness testing device, including a testing base, a testing seat, and a sealing head, as well as a slide rail seat, a drive cylinder, and a shaft seat disposed inside the testing base. In a preferred embodiment, the bottom end of the shaft seat is connected to an elbow rod assembly via a movable connection, allowing the elbow rod assembly to generate an elbow pressure amplification effect under driving action. The sealing head is slidably mounted on the internal guide structure of the testing base and moves vertically toward the testing seat. The output end of the drive cylinder is slidably mounted on the slide rail seat and rotatably connected to a connecting rod, the other end of which is rotatably connected to the middle section of the elbow rod assembly, allowing the action of the drive cylinder to be transmitted to the sealing head through the elbow rod structure. The bottom end of the sealing head is provided with a sealing ring and a suction channel; the testing seat is provided with concentrically arranged engagement grooves and tooling grooves, the tooling grooves further including a sealing abutment ring and an air pressure testing hole.

[0010] The specific technical effect is that, through the above-mentioned integrated structure, a dual-chamber seal is achieved at the top and bottom of the speaker, providing a stable sealing environment for subsequent negative pressure suction testing.

[0011] In a preferred example, the shape of the mating groove corresponds to the bottom structure of the sealing head, allowing the sealing ring to form a stable contact surface during downward pressing. During testing, the sealing ring can simultaneously press the mating groove against the upper surface of the speaker, completely closing the top sealing area.

[0012] The specific technical effect is that by matching the geometry of the joint groove, the fitting accuracy between the sealing head and the speaker surface is improved, thereby ensuring the sealing reliability of the negative pressure suction.

[0013] In a preferred example, the toggle lever assembly employs a three-section linkage structure, with the three sections sequentially hinged by pins to form a foldable and expandable mechanical fulcrum system. One end of the connecting rod is hinged to the midpoint of the middle section of the toggle lever assembly, allowing the linear motion of the drive cylinder to be converted into high-output downward pressure through the toggle lever structure to achieve sealing head clamping.

[0014] Specifically, the elbow assembly has a mechanical amplification effect, which can generate a large clamping force under a small cylinder thrust, thereby improving the pressing strength and sealing stability of the sealing head.

[0015] In a preferred example, a plurality of sliding strip structures are provided on the outer side of the sealing head, arranged perpendicularly to the surface of the testing base, and each sliding strip slides into the inner side of the testing base. This structure ensures that the sealing head moves vertically without deflection or jamming.

[0016] Specifically, ensure that the sealing head and the upper surface of the speaker are always pressed at the same angle to ensure uniform compression of the sealing interface and avoid misjudgment of air leakage.

[0017] In a preferred example, the tooling slot is designed according to the different speaker shapes and specifications. The sealing ring on its inner side and the bottom surface of the speaker form a lower sealing interface, so that a stable and sealed space is formed below the speaker. The air pressure detection hole is arranged in this space to collect the air pressure changes below.

[0018] Specifically, it can monitor whether the speaker is leaking in real time, significantly improving the sensitivity and accuracy of the detection results.

[0019] In a preferred example, a control panel can be installed on the detection seat to control the start and stop of the drive cylinder, the negative pressure suction process, the sampling procedure of the air pressure detection hole, and the output of related data.

[0020] Specifically, the on-site adjustable control interface enables automated testing processes, improving testing efficiency and ease of operation.

[0021] In a preferred example, both the sealing ring and the sealing abutment can be made of elastic sealing materials, such as silicone, rubber or polyurethane elastomer, to achieve a better fit and sealing elasticity.

[0022] Specifically, this improves the flexibility and adaptability of the sealing interface, reduces air leakage caused by assembly tolerances, and enhances the reliability of negative pressure detection.

[0023] In a preferred example, the air pressure detection port is connected to the airtightness detection component of the detection system via an internal channel to enable real-time pressure monitoring of the air chamber at the bottom of the speaker.

[0024] Specifically, it can directly reflect the airtightness of the loudspeaker, providing a fast, real-time, and quantifiable basis for judgment in the testing system.

[0025] The beneficial effects achieved by this utility model are as follows:

[0026] 1. In this invention, the sealing head is vertically positioned within the testing base using a sliding guide structure. A linkage mechanism consisting of a drive cylinder, a connecting rod, and a three-section elbow assembly converts the linear thrust of the drive cylinder into a downward pressing force amplified by the elbow. This ensures that the sealing ring of the sealing head is stably pressed against the mating groove of the testing base and the top surface of the speaker, significantly improving pressing stability and sealing reliability. This structure effectively avoids problems such as uneven manual pressing and loose sealing interfaces, improving the repeatability and consistency of airtightness testing.

[0027] 2. In this invention, the tooling groove of the testing seat is equipped with a sealing ring and a pressure detection hole, and a suction channel is set inside the sealing head, forming a double-sealed cavity for the speaker during the testing process. The negative pressure suction of the suction channel and the pressure monitoring of the pressure detection hole work together to directly reflect whether leakage has occurred in the speaker cavity, enabling rapid and accurate judgment of the speaker's airtightness. Compared with traditional methods that rely on water immersion testing or visual inspection for leakage, this structure has advantages such as high testing efficiency, intuitive testing results, and non-destructive testing of products, which can significantly improve airtightness testing performance and the automation level of the production line. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0029] Figure 2 This is a schematic diagram of the detection seat and sealing pressure head structure according to one embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the surface structure of the detection seat according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the linkage structure between the drive cylinder and the sealing head according to one embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of an elbow lever assembly structure according to an embodiment of the present invention.

[0033] Figure label:

[0034] 100. Testing machine base; 110. Slide rail seat; 120. Drive cylinder; 130. Shaft seat; 140. Toggle lever assembly; 141. Connecting rod;

[0035] 200, Detection seat; 210, Joint groove; 220, Tooling groove; 221, Sealing ring; 222, Air pressure detection hole;

[0036] 300, sealing head; 310, sealing ring; 320, suction channel. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0038] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0039] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, a loudspeaker airtightness testing device.

[0040] Combination Figures 1-5 As shown, the present invention provides a loudspeaker airtightness testing device, including a testing base 100, a testing seat 200, a sealing pressure head 300, and a slide rail seat 110, a drive cylinder 120 and a shaft seat 130 fixedly disposed inside the testing base 100.

[0041] The testing base 100 serves as a rigid support platform for the entire device, and its internal slide rail mounting structure guides the vertical sliding of the sealing head 300. Control circuitry, pressure sampling units, or structural fasteners can be installed at the lower part of the testing base 100 as needed to ensure the stable operation of the entire testing mechanism.

[0042] like Figure 2 , Figure 4 , Figure 5 As shown, an elbow assembly 140 is movably connected between the bottom end of the bearing 130 and the sealing head 300. The elbow assembly 140 is a three-section linkage mechanism. The three sections of the elbow assembly 140 are connected end to end by hinges, giving it a mechanical elbow pressure amplification function.

[0043] The output end of the drive cylinder 120 is slidably mounted in the internal guide groove structure of the slide rail seat 110, and is rotatably connected to the midpoint of the middle section of the elbow assembly 140 via the connecting rod 141. When the drive cylinder 120 pushes, the connecting rod 141 converts the linear output into the angle contraction of the elbow assembly 140, so that the elbow assembly 140 applies a downward clamping force to the sealing pressure head 300, thereby achieving vertical clamping of the detection seat 200.

[0044] like Figure 2 , Figure 4 As shown, the sealing head 300 is slidably installed inside the testing base 100 through several sliding strip structures perpendicular to the testing base 200 provided on its outer wall, so that the sealing head 300 can make precise linear guiding movement relative to the testing base 200 in the vertical direction, so as to avoid skew or friction interference and ensure uniform contact of the sealing pressing surface.

[0045] The bottom surface of the sealing head 300 is provided with a sealing ring 310, which is used to press against the joint groove 210 and the top surface of the speaker during the testing process to establish a sealing interface. The sealing head 300 has an internal suction channel 320, which is used to connect with an external air pump to create negative pressure, absorbing air from the top cavity of the speaker to test its airtightness. The position of the suction channel 320 matches the internal structure of the testing seat 200, thereby ensuring a stable and reliable suction space.

[0046] like Figure 3 As shown, the surface of the detection seat 200 is provided with concentrically arranged engagement grooves 210 and tooling grooves 220. The engagement groove 210 is used to cooperate with the sealing ring 310 of the sealing head 300, so that the two come into contact to form the sealing interface required by the utility model.

[0047] The tooling slot 220 has a sealing ring 221 inside, which is used to fit against the bottom surface of the speaker to form another sealing interface, ensuring that the speaker forms a sealed structure at both ends during the testing process. In addition, the tooling slot 220 also has an air pressure detection hole 222, which is used to sense the air pressure change in the space under the speaker in real time during the testing process, thereby determining whether the speaker's airtightness is qualified.

[0048] In one embodiment of this utility model, such as Figure 3 As shown, the surface of the detection seat 200 can be equipped with a control panel for controlling the stroke of the drive cylinder 120, the start of the pressure sampling system, the air pump control of the suction channel 320, and the acquisition and display of relevant signals during the detection process.

[0049] In one embodiment of this utility model, the sealing ring 310 of the sealing head 300 and the sealing abutment ring 221 on the surface of the detection seat 200 can be made of flexible rubber, silicone elastomer or polymer material with certain compression resilience to enhance the sealing effect, reduce the risk of scratches caused by hard contact, and ensure the stability of the airtightness test results.

[0050] Working principle and usage process of this utility model:

[0051] In the working process of the loudspeaker airtightness testing device of this utility model, the loudspeaker to be tested is first placed inside the tooling groove of the testing base, so that the bottom surface of the loudspeaker is in contact with the sealing ring, and the air pressure detection hole is located in the space area below the loudspeaker. Then, the drive cylinder is activated and pushes the connecting rod forward, causing the elbow assembly to gradually retract from its extended state. Through the elbow pressure amplification effect, the sealing pressure head is driven to move downwards along the slide rail structure on the inner side of the testing base until the sealing ring presses against the joint groove and the top surface of the loudspeaker, forming a top sealing interface. After the sealing pressure head is firmly pressed, its internal suction channel is connected to the external air pump system, performing negative pressure suction on the top cavity of the loudspeaker to form the pressure difference required for testing. If the loudspeaker has an airtightness leak, the air pressure in the space below the loudspeaker will change through the leakage path and be sensed in real time by the air pressure detection hole; if the loudspeaker has good airtightness, the air pressure detection hole will not detect a significant pressure change. Throughout the process, the elbow assembly provides enhanced clamping force to ensure a tight seal at the sealing interface, thereby improving the accuracy and stability of the airtightness test results.

[0052] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A loudspeaker airtightness testing device, characterized in that, include: The test base (100), the test seat (200), and the sealing head (300) are provided, as well as the slide rail seat (110), the drive cylinder (120), and the shaft seat (130) fixedly disposed inside the test base (100); the bottom end of the shaft seat (130) is movably connected to the elbow rod assembly (140); the sealing head (300) is slidably installed inside the test base (100) and slides vertically toward the surface of the test seat (200); The output end of the drive cylinder (120) is slidably mounted on the slide rail seat (110) and is rotatably connected to the middle section of the elbow rod assembly (140) via the connecting rod (141); the bottom surface of the sealing head (300) is provided with a sealing ring (310) and a suction channel (320); the surface of the detection seat (200) is provided with a concentrically arranged joint groove (210) and a tooling groove (220), and the inner side of the tooling groove (220) is provided with a sealing abutment ring (221) and a pressure detection hole (222).

2. The loudspeaker airtightness testing device according to claim 1, characterized in that, The shape and specifications of the engagement groove (210) are adapted to the shape and specifications of the bottom surface of the sealing head (300), and during the engagement of the detection seat (200) and the sealing head (300), the bottom surface of the sealing ring (310) simultaneously presses against the engagement groove (210) and the speaker surface.

3. The loudspeaker airtightness testing device according to claim 1, characterized in that, The elbow linkage (140) is a three-section linkage structure, with the three sections connected in a hinged manner. One end of the connecting rod (141) is rotatably connected to the midpoint of the middle section of the elbow linkage (140).

4. The loudspeaker airtightness testing device according to claim 1, characterized in that, The outer surface of the sealing head (300) is provided with a plurality of slide bars arranged perpendicular to the surface of the detection seat (200). Each slide bar is slidably sleeved on the inner side of the detection base (100) to guide the sealing head (300) to achieve linear movement on the surface of the detection seat (200) in the vertical direction.

5. The loudspeaker airtightness testing device according to claim 1, characterized in that, The shape and specifications of the tooling groove (220) are adapted to the external specifications of the speaker, and the sealing ring (221) is used to abut against the bottom surface of the speaker to achieve a sealing fit.

6. The loudspeaker airtightness testing device according to claim 1, characterized in that, The surface of the detection seat (200) is provided with a control panel for controlling the suction process of the suction channel (320) and the air pressure detection parameters.

7. The loudspeaker airtightness testing device according to claim 1, characterized in that, Both the sealing pressure ring (310) and the sealing abutment ring (221) are made of elastic sealing material to form a reliable sealing interface during the extrusion process.

8. The loudspeaker airtightness testing device according to claim 1, characterized in that, The air pressure detection hole (222) is connected to the air tightness detection component through an internal channel, and is used to collect real-time air pressure change data in the space below the speaker.

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