A test fixture for the adhesion between a diaphragm and a voice coil

Abstract

This utility model provides a fixture for testing the adhesion force between a diaphragm and a voice coil, comprising a base, a mold core, a lower pull rod, and an upper pull rod. The top of the base has a voice coil feeding groove, and the mold core is detachably connected to the voice coil feeding groove. The four sides of the base have first screw holes communicating with the voice coil feeding groove, and clamping bolts are connected to the first screw holes. The lower pull rod includes a first pull rod and a disc connected to the bottom end of the first pull rod. The top of the first pull rod has a screw portion. The upper pull rod includes a second pull rod and a connecting end connected to the bottom end of the second pull rod. The bottom end of the connecting end has a threaded hole matching the screw portion. A hole is punched in the center of the diaphragm for the first pull rod to pass through. The disc is placed inside the diaphragm. The voice coil is fitted onto the mold core, and the clamping bolts are tightened to clamp the voice coil onto the mold core. The bottom end of the connecting end is connected to the screw portion. By pulling the upper pull rod upwards, the tensile force when the diaphragm and voice coil separate can be tested, improving the accuracy of the diaphragm-voice coil adhesion force test.

Description

Technical Field

[0001] This utility model relates to the technical field of testing fixtures for diaphragm and voice coil components, and more particularly to a testing fixture for the adhesion force between the diaphragm and the voice coil. Background Technology

[0002] The voice coil is the current-carrying coil in a loudspeaker and a crucial component of the mechanical wave system in an electrodynamic loudspeaker; it can be considered the heart of the loudspeaker. During loudspeaker manufacturing, adhesive is used to bond the diaphragm to the top surface of the voice coil, necessitating testing of the adhesion between the diaphragm and voice coil. Currently, due to the lack of dedicated testing fixtures for diaphragm-voice coil adhesion, tensile tests are conducted manually by operators pulling on the diaphragm and voice coil. This method yields inaccurate results and makes it difficult to ensure the quality of the voice coil-diaphragm assembly. Summary of the Invention

[0003] The problem to be solved by this utility model is to provide a test fixture for the adhesion force between the diaphragm and the voice coil, which can improve the accuracy of tensile testing.

[0004] To solve the above technical problems, a testing fixture for the adhesion force between a diaphragm and a voice coil provided by this utility model is provided, comprising a base, a mold core, a lower pull rod, and an upper pull rod. The top of the base is provided with a voice coil feeding groove, and the mold core is detachably connected to the voice coil feeding groove. The four sides of the base are provided with first screw holes communicating with the voice coil feeding groove, and clamping bolts are connected to the first screw holes. The lower pull rod includes a first pull rod and a disc connected to the bottom end of the first pull rod. The top end of the first pull rod is provided with a screw part. The upper pull rod includes a second pull rod and a connecting end connected to the bottom end of the second pull rod. The bottom end of the connecting end is provided with a threaded hole matching the screw part.

[0005] Preferably, the bottom center of the voice coil feeding groove is provided with a positioning hole that matches the mold core, the mold core is set in the positioning hole, the bottom of the base is provided with a cavity, a through hole connects the positioning hole and the cavity, the mold core is provided with a countersunk hole that corresponds to the through hole, and the countersunk hole and the through hole are connected by bolts.

[0006] Preferably, it further includes a coupling and a washer. The top end of the coupling is provided with a first connecting hole, and the bottom end of the coupling is provided with a second connecting hole communicating with the first connecting hole. The second connecting hole matches a second pull rod, and the second pull rod is inserted into the second connecting hole. The top end of the second pull rod is provided with a connecting screw hole. The washer is connected to the top end of the second pull rod by a bolt. The side wall of the coupling is provided with a pin hole communicating with the first connecting hole.

[0007] Preferably, the top of the disk is provided with a spherical surface.

[0008] Preferably, the cross-section of the connecting end is a regular hexagon.

[0009] The beneficial effects of this utility model are as follows: This utility model provides a test fixture for the adhesion force between the diaphragm and the voice coil. The outer diameter of the mold core is set to be in clearance fit with the inner diameter of the voice coil. Before testing, a hole is punched in the center of the top of the diaphragm to allow the first pull rod to pass through. The first pull rod is then passed through the hole from the bottom of the diaphragm. The disc is covered inside the diaphragm. Then, the voice coil is placed in the voice coil feeding groove and fitted onto the mold core. The clamping bolt is tightened to clamp the voice coil onto the mold core. The bottom end of the connecting end is then threaded onto the screw part. The base is fixed on the test table, and the test head of the tensile testing machine is fixedly connected to the second pull rod. By pulling the upper pull rod upward with the tensile testing machine, the diaphragm will be subjected to the upward pulling force of the disc. This can test the magnitude of the pulling force when the diaphragm and the voice coil separate, which can improve the accuracy of the adhesion force test between the diaphragm and the voice coil. It has the advantages of simple structure and easy operation. Attached Figure Description

[0010] Figure 1 A schematic diagram illustrating the external structure of this utility model is provided.

[0011] Figure 2 A cross-sectional view of the present invention is shown.

[0012] Figure 3 An exploded view of the present invention is shown.

[0013] The reference numerals in the attached diagrams are as follows: 1. Base; 10. Voice coil feed groove; 11. First screw hole; 12. Positioning hole; 13. Cavity; 14. Through hole; 2. Mold core; 20. Countersunk hole; 3. Pull rod; 30. First pull rod; 31. Disc; 32. Screw part; 310. Spherical surface; 4. Upper pull rod; 40. Second pull rod; 40. Connecting screw hole; 400. Connecting end; 41. Threaded hole; 410. Clamping bolt; 5. Coupling; 6. First connecting hole; 60. Second connecting hole; 61. Pin hole; 62. Washer; 7. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure.

[0015] Based on the embodiments described in this disclosure, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this disclosure.

[0016] refer to Figures 1-3 .

[0017] This utility model provides a test fixture for the adhesion force between a diaphragm and a voice coil, comprising a base 1, a mold core 2, a lower pull rod 3, and an upper pull rod 4. The top of the base 1 is provided with a voice coil feeding groove 10, and the mold core 2 is detachably connected to the voice coil feeding groove 10. The four sides of the base 1 are provided with first screw holes 11 communicating with the voice coil feeding groove 10, and clamping bolts 5 are connected to the first screw holes 11. The lower pull rod 3 includes a first pull rod 30 and a disc 31 connected to the bottom end of the first pull rod 30. The top end of the first pull rod 30 is provided with a screw part 32. The upper pull rod 4 includes a second pull rod 40 and a connecting end 41 connected to the bottom end of the second pull rod 40. The bottom end of the connecting end 41 is provided with a threaded hole 410 that matches the screw part 32.

[0018] The specific operating principle is as follows: the outer diameter of the mold core 2 is set to be in clearance fit with the inner diameter of the voice coil. Before testing, a hole is punched in the center of the top of the diaphragm to allow the first pull rod 30 to pass through. The first pull rod 30 is then passed through the hole from the bottom of the diaphragm, and the disc 31 is covered inside the diaphragm. The voice coil is then placed in the voice coil feeding groove 10 and fitted onto the mold core 2. The clamping bolt 5 is tightened to clamp the voice coil onto the mold core 2. The bottom end of the connecting end 41 is then threaded onto the screw part 32. The base 1 is fixed on the test table, and the test head of the tensile testing machine is fixedly connected to the second pull rod 40. By pulling the upper pull rod 4 upward with the tensile testing machine, the diaphragm will be subjected to the upward pulling force of the disc 31. This can test the magnitude of the pulling force when the diaphragm separates from the voice coil, which can improve the accuracy of the adhesion test between the diaphragm and the voice coil. It has the advantages of simple structure and easy operation.

[0019] Based on the above embodiments, the bottom center of the voice coil feeding groove 10 is provided with a positioning hole 12 that matches the mold core 2. The mold core 2 is set in the positioning hole 12. The bottom of the base 1 is provided with a cavity 13. A through hole 14 connects the positioning hole 12 and the cavity 13. The mold core 2 is provided with a countersunk hole 20 that corresponds to the through hole 14. The countersunk hole 20 and the through hole 14 are connected by bolts, which can fix the mold core 2 to the base 1 and facilitate the disassembly and replacement of the mold core 2.

[0020] Based on the above embodiments, the system further includes a coupling 6 and a washer 7. The top end of the coupling 6 has a first connecting hole 60, and the bottom end of the coupling 6 has a second connecting hole 61 communicating with the first connecting hole 60. The second connecting hole 61 matches a second pull rod 40, which is inserted into the second connecting hole 61. The top end of the second pull rod 40 has a connecting screw hole 400. The washer 7 is bolted to the top end of the second pull rod 40. A pin hole 62 communicating with the first connecting hole 60 is provided through the side wall of the coupling 6. The first connecting hole 60 is shaped to match the test head of the tensile testing machine. The test head has a connecting hole. After inserting the test head into the first connecting hole 60, a pin is inserted between the connecting hole and the pin hole 62 to connect the test head to the coupling 6, facilitating the connection between the upper pull rod 4 and the testing machine.

[0021] Based on the above embodiments, a spherical surface 310 is provided on the top of the disk 31. The shape of the spherical surface 310 matches the shape of the diaphragm to be tested, allowing the inner wall of the diaphragm to fit tightly against the spherical surface 310 during testing, ensuring uniform stress on the diaphragm and improving test accuracy.

[0022] Based on the above embodiments, the cross-section of the connecting end 41 is a regular hexagon, which makes it convenient to pinch the connecting end 41 to drive the upper pull rod 4 to rotate, so as to thread the connecting end 41 onto the screw part 32.

[0023] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A fixture for testing the adhesion force between a diaphragm and a voice coil, characterized in that, The device includes a base, a mold core, a lower pull rod, and an upper pull rod. The top of the base is provided with a voice coil feeding groove, and the mold core is detachably connected to the voice coil feeding groove. The four sides of the base are provided with first screw holes communicating with the voice coil feeding groove, and clamping bolts are connected to the first screw holes. The lower pull rod includes a first pull rod and a disc connected to the bottom end of the first pull rod. The top end of the first pull rod is provided with a screw portion. The upper pull rod includes a second pull rod and a connecting end connected to the bottom end of the second pull rod. The bottom end of the connecting end is provided with a threaded hole that matches the screw portion.

2. The loudspeaker diaphragm and voice coil adhesion test fixture of claim 1, wherein, The bottom center of the voice coil feeding groove is provided with a positioning hole that matches the mold core. The mold core is set in the positioning hole. The bottom of the base is provided with a cavity. A through hole connects the positioning hole and the cavity. The mold core is provided with a countersunk hole that corresponds to the through hole. The countersunk hole and the through hole are connected by bolts.

3. The loudspeaker diaphragm and voice coil adhesion test fixture of claim 2, wherein: It also includes a coupling and a washer. The top end of the coupling is provided with a first connecting hole, and the bottom end of the coupling is provided with a second connecting hole communicating with the first connecting hole. The second connecting hole matches the second pull rod, and the second pull rod is inserted into the second connecting hole. The top end of the second pull rod is provided with a connecting screw hole. The washer is connected to the top end of the second pull rod by a bolt. The side wall of the coupling is provided with a pin hole communicating with the first connecting hole.

4. The diaphragm-voice coil adhesion testing fixture according to claim 3, characterized in that, The top of the disk is provided with a spherical surface.

5. The loudspeaker diaphragm and voice coil adhesion test fixture of claim 4, wherein: The cross-section of the connecting end is a regular hexagon.

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