A sound box air tightness testing device

Abstract

The utility model relates to a testing device, and in particular to a sound box air tightness testing device. The utility model aims to provide a sound box air tightness testing device, including a shell, a parts box, a box cover, a first cylinder, a first piston rod, a sealing chamber, a first sealing ring of a base, a first pressure relief valve, an air booster pump, a telescopic air pipe, an isolation valve, a pressure difference sensor and an air tightness detector, etc.; a first groove is provided on the upper left side of the shell, a second groove is provided on the right side of the shell, a parts box is fixedly connected to the top of the shell, a plurality of air holes are provided on the rear side of the parts box, a box cover is provided on the parts box, a first cylinder is installed on the left side of the parts box, and a first piston rod is installed on the output rod of the first cylinder. A closed space is formed by setting a sealing chamber and a base, and the sound box is in the closed space. The pressure decay method is implemented by the action of the pressure difference sensor and the air tightness detector, and the air tightness of the sound box is accurately tested by whether a pressure difference is generated in the closed space.

Description

Technical Field

[0001] The utility model relates to a testing device, in particular to a sound box air tightness testing device. Background Art

[0002] Since the sealing effect of the speaker directly affects the low-frequency output sound pressure of speaker products, we often need to test its airtightness when making speaker products. When the product has waterproof requirements, we also need to refer to its airtightness to estimate its waterproof performance.

[0003] In the prior art, when the pressure gauge method is used, it is necessary to reserve air injection holes on the surface of the product. The subsequent sealing of the reserved air injection holes increases the risk of air leakage, and this method can only test whether the speaker is leaking, but cannot accurately detect the leakage point. When the water inspection method is used, once the product is flooded, it may cause irreparable damage to the components. The airtightness test is inefficient and requires repeated disassembly, assembly and verification. It is not suitable for full inspection on the production line, but the water inspection method can accurately measure the leakage point of the speaker.

[0004] Therefore, we need to design a speaker air tightness testing device that first uses the pressure decay method to test the air tightness and then uses the water detection method to test the leakage point. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art that the water leakage point cannot be detected and the water detection efficiency is low and damages the product components, the technical problem to be solved is: to provide a speaker air tightness testing device.

[0006] The technical scheme of the utility model is: a sound box air tightness test device, including a shell, a parts box, a box cover, a first cylinder, a first piston rod, a sealing chamber, a base, a first sealing ring, a first pressure relief valve, an air booster pump, a telescopic air pipe, an isolation valve, a pressure difference sensor and an air tightness detector, a first groove is opened on the upper left side of the shell, a second groove is opened on the right side of the shell, a parts box is fixedly connected to the top of the shell, a plurality of air holes are opened on the rear side of the parts box, a box cover is covered on the parts box, a first cylinder is installed on the left side of the parts box, a first piston rod is installed on the output rod of the first cylinder, the bottom of the first piston rod passes through the bottom of the parts box and the top of the shell, and the bottom of the first piston rod is fixedly connected to the sealing chamber A base is fixedly connected to the bottom of the first groove, the bottom of the sealed chamber is sealed and fitted with the inner bottom of the base, the sealed chamber and the base form a closed space, a first sealing ring is fitted on the inner wall of the base, the inner side of the first sealing ring surrounds the outer side of the bottom of the sealed chamber, a first pressure relief valve is installed on the front side of the top of the sealed chamber, an air booster pump is installed on the rear side of the first cylinder, a telescopic air pipe is fixedly connected to the left part of the air booster pump, an isolation valve is installed on the upper part of the telescopic air pipe, the lower part of the telescopic air pipe penetrates into the sealed chamber, the lower part of the telescopic air pipe is fixedly connected to the sealed chamber, a differential pressure sensor is installed on the front side of the inner bottom of the base, an airtightness detector is installed on the lower left side of the outer shell, and the first cylinder, the air booster pump and the differential pressure sensor are all electrically connected to the airtightness detector.

[0007] In one of the embodiments, the air tightness testing device also includes a water inspection mechanism, which includes a water inspection chamber, a closing cover, a second sealing ring, a water inlet pipe, a second pressure relief valve, a second cylinder, a second piston rod, a vacuum pump, a telescopic exhaust pipe and a vacuum valve. A water inspection chamber is placed in the second groove, and a closing cover is provided on the water inspection chamber. A second sealing ring is embedded in the lower inner part of the closing cover, and the outer side of the second sealing ring is in contact with the inner wall of the water inspection chamber. A water inlet is provided on the front right top side of the closing cover, and a closed water inlet pipe is installed at the water inlet. A second pressure relief valve is installed on the top of the closing cover. A second cylinder is installed on the right side of the parts box, and a second piston rod is installed on the output rod of the second cylinder. The second piston rod penetrates into the center point of the closing cover. A vacuum pump is installed on the right side of the parts box, and a telescopic exhaust pipe is fixedly connected to the middle position of the front end of the vacuum pump. A vacuum valve is installed in the middle of the telescopic exhaust pipe. The lower part of the telescopic exhaust pipe penetrates into the closing cover, and the lower part of the telescopic exhaust pipe is fixedly connected to the closing cover.

[0008] In one embodiment, the air tightness testing device further includes a stopper and a spring. The middle portion of the second piston rod of the second cylinder is fixedly connected with the stopper, and the spring is connected between the bottom of the stopper and the top of the closing cover.

[0009] In one embodiment, the air tightness testing device further includes a motor, the bottom of the second piston rod is fixedly connected with the motor, and the second cylinder, the vacuum pump and the motor are all electrically connected to the air tightness detector.

[0010] In one of the embodiments, the air tightness testing device also includes a fixing mechanism, which includes a lifting plate, a circular fixed frame, a rectangular fixed frame and an elastic band. The output shaft of the motor is fixedly connected to the lifting plate, and the lifting plate is located inside the water inspection chamber. A circular fixed frame is inlaid on the left side of the lifting plate, and a rectangular fixed frame is inlaid on the right side of the lifting plate. Two elastic bands are arranged in the middle of the lifting plate, and the two elastic bands are distributed on the front and rear sides of the output shaft of the motor. Card slots are left at the left and right ends of the lifting plate, and the elastic bands are stuck in the card slots. The upper part of the elastic band is in contact with the top of the circular fixed frame and the rectangular fixed frame, and the elastic band is used to fix the product to be tested placed in the circular fixed frame and the rectangular fixed frame.

[0011] In one embodiment, a plurality of circular holes are formed on the lifting plate, the circular fixing frame and the rectangular fixing frame.

[0012] Compared with the prior art, the utility model has the following advantages: 1. A closed space is formed by setting a sealed chamber and a base, and the speaker is in the closed space. The pressure decay method is implemented through the action of a pressure difference sensor and an airtightness detector, and the airtightness of the speaker is accurately tested by whether a pressure difference is generated in the closed space.

[0013] 2. A closed space is formed by setting up a water inspection chamber and a closing cover. A vacuum pump is used to create a negative pressure state in the closed space. Under the negative pressure state, the lifting plate carries the speaker into the water to implement the water inspection method. The motor drives the lifting plate to rotate slowly to facilitate observation by the inspector, thereby accurately detecting the leakage point of the leaking speaker.

[0014] 3. First use the pressure decay method to detect the air tightness of the speaker, and then conduct a water test on the leaking speaker. Compared with directly using the water test method to detect the air tightness of the speaker, the pressure decay method preliminarily screens out the leaking speakers, effectively reducing the problem of water testing damaging non-leaking speaker components. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0016] Figure 2 It is a three-dimensional cross-sectional structural schematic diagram of the shell, parts box, box cover and other components of the utility model.

[0017] Figure 3 It is a three-dimensional cross-sectional structural schematic diagram of the air booster pump, isolation valve, first cylinder and other components of the utility model.

[0018] Figure 4 It is a three-dimensional cross-sectional structural schematic diagram of the water inlet pipe, vacuum pump and telescopic exhaust pipe of the utility model.

[0019] Figure 5 It is a three-dimensional cross-sectional structural schematic diagram of the vacuum chamber, the closing cover and the second sealing ring of the utility model.

[0020] Figure 6 It is a three-dimensional structural schematic diagram of the motor, lifting plate and circular fixing frame of the utility model.

[0021] Marked in the figure: 1-housing, 2-first groove, 3-second groove, 4-parts box, 5-box cover, 6-first cylinder, 7-first piston rod, 8-sealed chamber, 9-base, 10-first sealing ring, 11-first pressure relief valve, 12-air booster pump, 13-telescopic air pipe, 14-isolating valve, 15-differential pressure sensor, 16-air tightness detector, 17-water inspection chamber, 18-closing cover, 19-second sealing ring, 20-water inlet pipe, 21-second pressure relief valve, 22-second cylinder, 23-second piston rod, 24-stopper, 25-spring, 26-motor, 27-lifting plate, 28-circular fixed frame, 29-rectangular fixed frame, 30-elastic bandage, 31-vacuum pump, 32-telescopic exhaust pipe, 33-vacuum valve. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with specific embodiments. It should also be noted that, unless otherwise clearly specified and limited, terms such as: setting, installing, connecting, and connecting should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Embodiment: A speaker air tightness test device, such as Figure 1 and Figure 2As shown, it includes a shell 1, a parts box 4, a box cover 5, a first cylinder 6, a first piston rod 7, a sealing chamber 8, a base 9, a first sealing ring 10, a first pressure relief valve 11, an air booster pump 12, a telescopic air pipe 13, an isolation valve 14, a differential pressure sensor 15 and an airtightness detector 16. A first groove 2 is opened on the upper left side of the shell 1, a second groove 3 is opened on the right side of the shell 1, a parts box 4 is fixedly connected to the top of the shell 1, a plurality of air holes are opened on the rear side of the parts box 4, a box cover 5 is covered on the parts box 4, a first cylinder 6 is installed on the left side of the parts box 4, a first piston rod 7 is installed on the output rod of the first cylinder 6, the bottom of the first piston rod 7 passes through the bottom of the parts box 4 and the top of the shell 1, the bottom of the first piston rod 7 is fixedly connected to the sealing chamber 8, and the bottom of the first groove 2 is fixedly connected to the base. 9. The bottom of the sealed chamber 8 is sealed with the bottom of the base 9, and the sealed chamber 8 and the base 9 form a closed space. The inner wall of the base 9 is fitted with a first sealing ring 10, and the inner side of the first sealing ring 10 surrounds the outer side of the bottom of the sealed chamber 8. A first pressure relief valve 11 is installed on the front side of the top of the sealed chamber 8. An air booster pump 12 is installed on the rear side of the first cylinder 6. A telescopic air pipe 13 is fixedly connected to the left part of the air booster pump 12. An isolation valve 14 is installed on the upper part of the telescopic air pipe 13. The lower part of the telescopic air pipe 13 penetrates into the sealed chamber 8, and the lower part of the telescopic air pipe 13 is fixedly connected to the sealed chamber 8. A pressure difference sensor 15 is installed on the front side of the bottom of the base 9, and an airtightness detector 16 is installed on the lower left side of the shell 1. The first cylinder 6, the air booster pump 12 and the pressure difference sensor 15 are all electrically connected to the airtightness detector 16.

[0024] When it is necessary to test the air tightness of the speaker, the airtightness detector 16 is used to control the first cylinder 6 to start, so that the first piston rod 7 drives the sealed chamber 8 to move upward, and the telescopic air pipe 13 shrinks upward accordingly, and the speaker to be tested is placed on the base 9, and the first cylinder 6 is started again to drive the sealed chamber 8 to reset and form a closed space with the base 9, and the air booster pump 12 is controlled to start by the airtightness detector 16. The inspector manually opens the isolation valve 14, and clean air of a certain pressure and volume enters the sealed chamber 8 from the telescopic air pipe 13. Wait for a while, and when the sealed chamber 8 is closed, the air booster pump 12 is started. The inspector manually opens the isolation valve 14, and clean air of a certain pressure and volume enters the sealed chamber 8 from the telescopic air pipe 13. After waiting for a period of time, the airtightness is When the air pressure in the sealed chamber 8 reaches stability, turn off the air booster pump 12 to disconnect the air supply, close the isolation valve 14, and operate the airtightness detector 16 to start testing. The differential pressure sensor 15 transmits the air pressure difference signal to the airtightness detector 16. If the sensor pressure drops, it means that the speaker is leaking. Otherwise, it means that the speaker is not leaking. Open the first pressure relief valve 11. When the pressure in the sealed chamber 8 returns to normal, start the first cylinder 6 to drive the sealed chamber 8 to move upward, take out the tested speaker, take away the speaker without leakage, and perform a water inspection test on the leaking speaker.

[0025] like Figure 1 , Figure 2 and Figure 4-Figure 6As shown, the air tightness testing device also includes a water inspection mechanism, which includes a water inspection chamber 17, a closing cover 18, a second sealing ring 19, a water inlet pipe 20, a second pressure relief valve 21, a second cylinder 22, a second piston rod 23, a vacuum pump 31, a telescopic exhaust pipe 32 and a vacuum valve 33. The water inspection chamber 17 is placed in the second groove 3, and the water inspection chamber 17 is covered with a closing cover 18. The lower side of the closing cover 18 is inlaid with a second sealing ring 19. The outer side of the second sealing ring 19 is in contact with the inner wall of the water inspection chamber 17. The front side of the right top of the closing cover 18 is provided with a water inlet, and the water inlet A closed water inlet pipe 20 is installed at the opening, a second pressure relief valve 21 is installed on the top of the closing cover 18, a second cylinder 22 is installed on the right side of the inside of the parts box 4, a second piston rod 23 is installed on the output rod of the second cylinder 22, the second piston rod 23 penetrates into the center point of the closing cover 18, a vacuum pump 31 is installed on the right side of the inside of the parts box 4, a telescopic exhaust pipe 32 is fixedly connected to the middle position of the front end of the vacuum pump 31, a vacuum valve 33 is installed in the middle of the telescopic exhaust pipe 32, the lower part of the telescopic exhaust pipe 32 penetrates into the closing cover 18, and the lower part of the telescopic exhaust pipe 32 is fixedly connected to the closing cover 18.

[0026] like Figure 4 As shown, the air tightness testing device also includes a stopper 24 and a spring 25 . The stopper 24 is fixedly connected to the middle of the second piston rod 23 , and the spring 25 is connected between the bottom of the stopper 24 and the top of the closing cover 18 .

[0027] like Figure 4 and Figure 6 As shown, the air tightness testing device also includes a motor 26 , the motor 26 is fixedly connected to the bottom of the second piston rod 23 , and the second cylinder 22 , the vacuum pump 31 and the motor 26 are all electrically connected to the air tightness detector 16 .

[0028] like Figure 4 and Figure 6 As shown, the air tightness testing device also includes a fixing mechanism, which includes a lifting plate 27, a circular fixed frame 28, a rectangular fixed frame 29 and an elastic band 30. The output shaft of the motor 26 is fixedly connected to the lifting plate 27, and the lifting plate 27 is located inside the water inspection chamber 17. A circular fixed frame 28 is inlaid on the left side of the lifting plate 27, and a rectangular fixed frame 29 is inlaid on the right side of the lifting plate 27. A number of circular holes are opened on the lifting plate 27, the circular fixed frame 28 and the rectangular fixed frame 29. Two elastic bands 30 are arranged in the middle of the lifting plate 27, and the two elastic bands 30 are distributed on the front and rear sides of the output shaft of the motor 26. Card slots are left at the left and right ends of the lifting plate 27, and the elastic bands 30 are stuck in the card slots. The upper part of the elastic band 30 contacts the top of the circular fixed frame 28 and the rectangular fixed frame 29, and the elastic band 30 is used to fix the product to be tested placed in the circular fixed frame 28 and the rectangular fixed frame 29.

[0029] Open the closed water inlet pipe 20, and use the external water pipe to pour a certain amount of distilled water into the water inspection chamber 17. When the water level is lower than the bottom of the lifting plate 27, close the water inlet pipe 20, and control the second cylinder 22 to start through the airtightness detector 16, so that the second piston rod 23 drives the spring 25 to move upward, and the spring 25 drives the closing cover 18 to move upward, and the telescopic exhaust pipe 32 shrinks upward accordingly. At this time, the lifting plate 27 rises, and the leaking speaker is placed in the circular fixing frame 28 or the rectangular fixing frame 29 according to its shape, and the elastic band 30 is pulled up to fix the leaking speaker, and the second cylinder 22 is controlled to drive the closing cover 18 to reset, and then The closing cover 18 and the water inspection chamber 17 form a closed space. The inspector manually opens the vacuum valve 33 and controls the vacuum pump 31 through the airtightness detector 16 to extract the gas in the water inspection chamber 17 from the telescopic exhaust pipe 32 until the water inspection chamber 17 becomes in a negative pressure state. The second cylinder 22 is controlled to move the second piston rod 23 downward. At this time, the block 24 squeezes the spring 25, and the second piston rod 23 continues to move downward. The lifting plate 27 sinks into the water with the leaking speaker. The motor 26 is controlled by the airtightness detector 16, and the output shaft of the motor 26 drives the lifting plate 27 to rotate slowly. The inspector begins to observe the leakage point of the leaking speaker.

[0030] After the inspector accurately tests and records the leaking point, he opens the second pressure relief valve 21, and the outside gas is connected to the water inspection chamber 17. The second cylinder 22 is controlled so that the second piston rod 23 drives the motor 26 to move upward, and the lifting plate 27 brings the leaking speaker to the surface. The second piston rod 23 continues to move upward, and the block 24 no longer squeezes the spring 25. The spring 25 resets and drives the closing cover 18 to move upward, pulls up the elastic band 30, takes out the leaking speaker, marks the leaking point, and then dries the speaker and sends it for repair.

[0031] The above description is only an example of the implementation of the present invention and is not intended to limit the present invention. Any equivalent replacement made within the principle of the present invention shall be included in the protection scope of the present invention. The contents not elaborated in the present invention belong to the existing technology known to the technicians in this professional field.

Claims

1. A speaker air tightness test device, characterized in that: The invention comprises a housing (1), a parts box (4), a first cylinder (6), a first piston rod (7), a sealing chamber (8), a base (9), a first sealing ring (10), a first pressure relief valve (11), an air booster pump (12), a telescopic air pipe (13), an isolation valve (14), a differential pressure sensor (15) and an air tightness detector (16). The housing (1) is provided with a first groove (2) on the left side, and a second groove (3) on the right side. The housing (1) is fixedly connected to the top of the housing (1). The first cylinder (6) is installed on the left side of the parts box (4). The first piston rod (7) is installed on the output rod of the first cylinder (6). The bottom of the first piston rod (7) is fixedly connected to the sealing chamber (8). The bottom of the first groove (2) is fixedly connected to the base (9). The bottom of the sealing chamber (8) is sealed and fitted with the bottom of the base (9). 8) and the base (9) form a closed space, the inner wall of the base (9) is fitted with a first sealing ring (10), the inner side of the first sealing ring (10) surrounds the outer side of the bottom of the sealed chamber (8), the top of the sealed chamber (8) is equipped with a first pressure relief valve (11), the rear side of the first cylinder (6) is equipped with an air booster pump (12), the left part of the air booster pump (12) is fixedly connected with a telescopic air supply pipe (13), an isolation valve (14) is installed on the telescopic air supply pipe (13), the lower part of the telescopic air supply pipe (13) penetrates into the sealed chamber (8), the lower part of the telescopic air supply pipe (13) is fixedly connected to the sealed chamber (8), a pressure difference sensor (15) is installed at the bottom of the base (9), an air tightness detector (16) is installed at the lower left part of the housing (1), and the first cylinder (6), the air booster pump (12) and the pressure difference sensor (15) are all electrically connected to the air tightness detector (16).

2. A sound box air tightness testing device as claimed in claim 1, characterized in that: The air tightness testing device also includes a water inspection mechanism, which includes a water inspection chamber (17), a closing cover (18), a second sealing ring (19), a water inlet pipe (20), a second pressure relief valve (21), a second cylinder (22), a second piston rod (23), a vacuum pump (31), a telescopic exhaust pipe (32) and a vacuum valve (33). The water inspection chamber (17) is placed in the second groove (3). The water inspection chamber (17) is covered with a closing cover (18). The lower side of the closing cover (18) is inlaid with a second sealing ring (19). The outer side of the second sealing ring (19) is in contact with the inner wall of the water inspection chamber (17). The front right top side of the closing cover (18) is provided with a water inlet. A closed water inlet pipe (20) is installed, a second pressure relief valve (21) is installed on the top of the closing cover (18), a second cylinder (22) is installed on the right side of the interior of the parts box (4), a second piston rod (23) is installed on the output rod of the second cylinder (22), the second piston rod (23) penetrates into the center point of the closing cover (18), a vacuum pump (31) is installed on the right side of the interior of the parts box (4), a telescopic exhaust pipe (32) is fixedly connected to the middle position of the front end of the vacuum pump (31), a vacuum valve (33) is installed in the middle of the telescopic exhaust pipe (32), the lower part of the telescopic exhaust pipe (32) penetrates into the closing cover (18), and the lower part of the telescopic exhaust pipe (32) is fixedly connected to the closing cover (18).

3. A sound box air tightness testing device as claimed in claim 2, characterized in that: The airtightness testing device also includes a stopper (24) and a spring (25). The stopper (24) is fixedly connected to the middle of the second piston rod (23), and the spring (25) is connected between the bottom of the stopper (24) and the top of the closing cover (18).

4. A sound box air tightness testing device as claimed in claim 3, characterized in that: The airtightness testing device also includes a motor (26). The bottom of the second piston rod (23) is fixedly connected to the motor (26). The second cylinder (22), the vacuum pump (31) and the motor (26) are all electrically connected to the airtightness detector (16).

5. A sound box air tightness testing device as claimed in claim 4, characterized in that: The air tightness test device further comprises a fixing mechanism, which comprises a lifting plate (27), a circular fixing frame (28), a rectangular fixing frame (29) and an elastic band (30). The output shaft of the motor (26) is fixedly connected to the lifting plate (27), the lifting plate (27) is located inside the water inspection chamber (17), the left side of the lifting plate (27) is inlaid with a circular fixing frame (28), the right side of the lifting plate (27) is inlaid with a rectangular fixing frame (29), two elastic bands (30) are arranged in the middle of the lifting plate (27), the two elastic bands (30) are distributed on the front and rear sides of the output shaft of the motor (26), the left and right ends of the lifting plate (27) are provided with card slots, the elastic band (30) is stuck in the card slots, the upper part of the elastic band (30) is in contact with the top of the circular fixing frame (28) and the rectangular fixing frame (29), and the elastic band (30) is used to fix the test object placed in the circular fixing frame (28) and the rectangular fixing frame (29).

6. A sound box air tightness testing device as claimed in claim 5, characterized in that: A plurality of circular holes are provided on the lifting plate (27), the circular fixing frame (28) and the rectangular fixing frame (29).

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