Polyurethane sound transmission rubber vulcanization process

Abstract

The invention belongs to the technical field of rubber vulcanization, and particularly discloses a polyurethane sound-transmission rubber vulcanization process which comprises a lower die. The limiting assembly is used for limiting the position of the acoustic device, is located at the top of the lower die and is fixedly connected with the lower die; the adapter plate is used for connecting an acoustic device; the fixing plate is located at the top of the adapter plate, and a lifting assembly is arranged between the fixing plate and the adapter plate; a plurality of positioning holes are formed in the edges of the lower die, the limiting assembly and the fixing plate, guide columns are arranged in at least three positioning holes and sequentially penetrate through the lower die, the limiting assembly and the fixing plate, and the two ends of each guide column are fixedly connected with the positioning holes of the lower die and the fixing plate respectively. The lower die is arranged and connected with the limiting assembly and the fixing plate through the guide columns, so that the axis of the lower die, the axis of the limiting assembly and the axis of the fixing plate coincide, and the concentricity of the acoustic device and vulcanized rubber and the appearance quality of the vulcanized rubber are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of rubber vulcanization, and particularly relates to a polyurethane sound-transmitting rubber vulcanization process. Background Art

[0002] Acoustic devices work underwater by converting electrical energy of the transducer into kinetic energy and then into sound energy. However, in order to protect it from physical damage and seawater erosion in the complex underwater environment, it is necessary to coat its surface with a kind of rubber with good sound permeability before putting it into water for use to prevent the acoustic device from being damaged underwater.

[0003] In the design and application of acoustic devices, in order to achieve waterproof and sound-permeable functions, the front end of the acoustic device base array array needs to be coated with sound-permeable rubber. As a key watertight and sound-permeable material, the performance of sound-permeable rubber directly affects the transmission efficiency of sound waves and the overall performance of the transducer. The coating of sound-permeable rubber can be achieved through the vulcanization process. The molding of rubber is very critical in the vulcanization process. The surface smoothness of the vulcanization molding and the concentricity of the rubber layer and the acoustic device will greatly increase the noise of the acoustic device underwater, thereby affecting its comprehensive performance such as target detection, positioning and identification. Therefore, optimizing the vulcanization process and special mold design to ensure that the surface of the vulcanized rubber is smooth, concentric with the acoustic device and tightly coated is the key to the design and efficient and high-quality manufacturing of acoustic devices. The existing acoustic device vulcanization process is complicated and difficult to operate. There is a lack of special vulcanization molds for acoustic devices. When the acoustic device is vulcanized, the prepared sound-permeable rubber is slowly poured on the surface of the acoustic device, and then the pre-vulcanized acoustic device is placed in an oven for baking. There are problems such as the rubber and the acoustic device are not concentric and the rubber surface is not smooth. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects in the prior art and provide a polyurethane sound-transmitting rubber vulcanization process.

[0005] The present invention provides a polyurethane sound-transmitting rubber vulcanization process, comprising the following steps:

[0006] Step 1: Pre-treat the surface of the area to be vulcanized of the acoustic device;

[0007] Step 2: Wrap the top of the acoustic device with high-temperature tape and make sure the upper edge of the high-temperature tape is higher than the top of the acoustic device. Put the acoustic device into an oven for preheating at 50°C-80°C. The preheating time is 30-40 minutes.

[0008] Step 3: Weigh the required amount of polyurethane sound-permeable rubber and filter it, then put it into another oven for preheating at a temperature of 40°C-80°C for 30-40 minutes;

[0009] Step 4: Vacuum the preheated polyurethane sound-transmitting rubber to remove bubbles, and heat and melt the chain extender MOCA required for the polyurethane sound-transmitting rubber. When MOCA is melted and the temperature is 100°C-140°C, put the polyurethane sound-transmitting rubber into the stirrer and start high-speed stirring. While stirring, slowly pour MOCA into the rubber material, and rotate the rubber barrel and the stirring rod in the opposite direction for 1-5 minutes;

[0010] Step 5: Degas the glue solution obtained in step 4 for the second time until no bubbles are generated on the surface of the glue solution;

[0011] Step 6: Take an appropriate amount of the glue prepared in step 5, pour it on the top of the acoustic device, put it into an oven, heat it to 40-70°C, bake it for 50-90 hours, and then cool it down to room temperature;

[0012] Step 7: Apply adhesion promoter to the remaining area to be vulcanized;

[0013] Step 8: Pour an appropriate amount of the glue prepared in step 5 into the vulcanization mold, invert the acoustic device and immerse it in the glue to complete the vulcanization;

[0014] Step 9: Grind the rubber surface after pre-vulcanization.

[0015] A further solution is that the vulcanization mold in step 6 includes:

[0016] A lower mold, wherein the lower mold is a truncated cone structure with a hollow interior and an open top;

[0017] A lower mold, wherein the lower mold is a truncated cone structure with a hollow interior and an open top;

[0018] A limiting assembly, used for limiting the position of the acoustic device, wherein the limiting assembly is located at the top of the lower mold and is fixedly connected to the lower mold;

[0019] An adapter plate, located on the top of the limit assembly, used for connecting the acoustic device;

[0020] A fixed plate is located on the top of the adapter plate, and a lifting assembly is provided between the fixed plate and the adapter plate, and the lifting assembly is used to drive the adapter plate to rise or fall;

[0021] The edges of the lower mold, the limiting assembly and the fixed plate are each provided with a plurality of positioning holes, and guide columns are arranged in at least three of the positioning holes. The guide columns sequentially penetrate the lower mold, the limiting assembly and the fixed plate, and the two ends of the guide columns are respectively fixedly connected to the positioning holes of the lower mold and the fixed plate.

[0022] The step 8 comprises:

[0023] The lifting assembly drives the adapter plate and then drives the acoustic device to rise, so that a gap is left between the acoustic device and the lower mold;

[0024] Take an appropriate amount of the glue prepared in step 5 and pour it into the lower mold through the gap;

[0025] The lifting device drives the adapter plate and then drives the acoustic device to descend, so that the side wall of the acoustic device abuts against the limit assembly, and the acoustic device below the limit assembly is immersed in the lower mold and covered by the glue to complete vulcanization.

[0026] A further solution is that a positioning ring is provided on the outer side of the top of the lower mold, a plurality of connecting grooves are evenly opened on the positioning ring along the circumference, a fixing pin is provided inside the connecting groove, one end of the fixing pin is connected to the positioning ring, and the other end of the fixing pin is connected to the top of the lower mold;

[0027] The positioning hole of the lower die is arranged on the positioning ring.

[0028] A further solution is that the limiting assembly includes a first limiting ring and a second limiting ring;

[0029] The edge of the first limiting ring is provided with a plurality of positioning holes along the circumferential direction, and an annular receiving platform is provided inside the first limiting ring, and the receiving platform is integrally formed with the first limiting ring;

[0030] The positioning ring is provided with a connecting block, the first limiting ring and the connecting block are connected by a first bolt; the second limiting ring and the receiving platform are connected by a second bolt.

[0031] A further solution is that the top of the positioning ring is higher than the top of the lower mold, a recessed area is formed at the top of the lower mold, and a convex ring is provided at the bottom of the first limiting ring, and the convex ring is clamped inside the recessed area.

[0032] A further solution is that the second limiting ring is formed by splicing two semicircular rings; a mounting plate is arranged inside the semicircular ring, the mounting plate is a semicircular structure, and the circle where the semicircular structure and the semicircular ring are located are concentric circles;

[0033] The side wall of the mounting plate is covered with a rubber pad, and the rubber pad is fixedly connected to the mounting plate.

[0034] A further solution is that a through hole is opened in the center of the fixing plate;

[0035] The lifting assembly comprises a threaded disk and a screw rod, wherein the threaded disk is arranged inside the through hole and fixedly connected to the through hole, and the screw rod passes through the threaded disk;

[0036] A bearing is arranged at the top center of the adapter plate, the outer ring of the bearing is connected to the adapter plate, and the inner ring of the bearing is interference fit with the bottom of the screw; the bottom of the adapter plate is used for clamping the acoustic device.

[0037] A further solution is that a guide rod is further provided between the fixed plate and the adapter plate, the bottom of the guide rod is fixedly connected to the adapter plate, and the top of the guide rod passes through the fixed plate and is slidably connected to the fixed plate.

[0038] A further solution is that a torsion short column is provided at the top of the screw rod, and a wrench is sleeved on the outer side of the torsion short column.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The present invention sets a lower mold and connects the lower mold with a limit assembly and a fixed plate through a guide column, so that the axes of the lower mold, the limit assembly and the fixed plate coincide with each other. When vulcanization is performed, the configured sound-permeable rubber is poured into the lower mold, and the transfer plate is driven by the lifting assembly to drive the acoustic device down until it is immersed in the sound-permeable rubber to complete vulcanization. Through the mold design, the concentricity of the acoustic device and the vulcanized rubber and the appearance quality of the rubber after vulcanization are greatly improved, and the unqualified conditions such as the non-concentricity of the rubber vulcanization layer and the acoustic device and the rough surface of the vulcanization layer with bubbles are effectively avoided, and the vulcanization yield of the acoustic device is greatly improved.

[0041] The present invention provides a first limiting ring and a second limiting ring on the top of the lower mold, which play a limiting role in the process of the acoustic device descending. Specifically, when the acoustic device descends, the outer surface of the acoustic device is engaged with the second limiting ring, which plays a limiting role. The rubber pad is provided inside the second limiting ring to effectively avoid scratching the surface of the acoustic device. The size of the rubber pad can also be adjusted to achieve vulcanization of acoustic devices of different specifications, thereby improving the applicability of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The following drawings are only used to illustrate and explain the present invention, and are not intended to limit the scope of the present invention, wherein:

[0043] Figure 1 : Schematic diagram of the explosion of the structure of the present invention;

[0044] Figure 2 : Schematic diagram of the lower mold structure;

[0045] Figure 3 : Schematic diagram of the second limiting ring structure;

[0046] Figure 4 : Schematic diagram of the assembly of the second limiting ring and the first limiting ring;

[0047] Figure 5 : Schematic diagram of the external structure of the acoustic device;

[0048] In the figure: 1. lower mold; 2. positioning ring; 3. fixing pin; 4. connecting block; 5. first limiting ring; 6. first bolt; 7. receiving platform; 8. positioning hole; 9. second limiting ring; 10. second bolt; 11. fixing plate; 12. adapter plate; 13. guide rod; 14. bearing; 15. threaded disk; 16. screw; 17. twisting short column; 18. wrench; 19. guide column; 20. mounting plate; 21. rubber pad; 22. recessed area; 23. convex ring; 24. acoustic device; 25. area to be vulcanized; 26. high temperature tape. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution, design method and advantages of the present invention clearer, the present invention is further described in detail by specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] The present invention provides a polyurethane sound-transmitting rubber vulcanization process, comprising the following steps:

[0051] Step 1: sandblasting, cleaning, preheating, and applying an adhesion promoter on the surface of the area to be vulcanized (25) of the acoustic device 24;

[0052] Step 2: Wrap the top of the acoustic device 24 with a high temperature tape (26) and make the upper edge of the high temperature tape higher than the top of the acoustic device 24, and put the acoustic device 24 into an oven for preheating at a temperature of 50°C to 80°C. The preheating time is 30-40 minutes;

[0053] Step 3: Weigh the required amount of polyurethane sound-permeable rubber and filter it, then put it into another oven for preheating at a temperature of 40°C-80°C for 30-40 minutes;

[0054] Step 4: Vacuum the preheated polyurethane sound-transmitting rubber to remove bubbles, and heat and melt the chain extender MOCA required for the polyurethane sound-transmitting rubber. When MOCA is melted and the temperature is 100°C-140°C, put the polyurethane sound-transmitting rubber into the stirrer and start high-speed stirring. While stirring, slowly pour MOCA into the rubber material, and rotate the rubber barrel and the stirring rod in the opposite direction for 1-5 minutes;

[0055] Step 5: Degas the glue solution obtained in step 4 for the second time until no bubbles are generated on the surface of the glue solution;

[0056] Step 6: Take an appropriate amount of the glue prepared in step 5 and pour it on the top of the acoustic device 24, then put it into an oven, heat it to 40-70°C, bake it for 50-90 hours, and then cool it down to room temperature;

[0057] Step 7: Apply an adhesion promoter to the remaining area to be vulcanized (25);

[0058] Step 8: Pour an appropriate amount of the glue prepared in step 5 into the vulcanization mold, invert the acoustic device 24 and immerse it in the glue to complete the vulcanization;

[0059] Step 9: Grind the rubber surface after pre-vulcanization.

[0060] Among them, Figure 1 As shown, the vulcanization mold in step 8 includes:

[0061] A lower mold 1, wherein the lower mold 1 is a truncated cone structure with a hollow interior and an open top;

[0062] The lower mold 1 is a truncated cone structure with a hollow interior and an open top. Figure 2 As shown, a positioning ring 2 is arranged on the outer side of the top of the lower mold 1, and a plurality of connecting grooves are evenly opened on the positioning ring 2 along the circumferential direction. A fixing pin 3 is arranged inside the connecting groove, and one end of the fixing pin 3 is connected to the positioning ring 2, and the other end of the fixing pin 3 is connected to the top of the lower mold 1. A plurality of positioning holes 8 are arranged on the edge of the positioning ring 2 along the circumferential direction.

[0063] A limit assembly is used to limit the position of the acoustic device 24. The limit assembly is located at the top of the lower mold 1 and is fixedly connected to the lower mold 1. The limit assembly includes a first limit ring 5 and a second limit ring 9. The edge of the first limit ring 5 is provided with a plurality of positioning holes 8 along the circumferential direction. The first limit ring 5 is provided with an annular receiving platform 7 inside. The receiving platform 7 is integrally formed with the first limit ring 5. A connecting block 4 is provided on the positioning ring 2. The first limit ring 5 is connected to the connecting block 4 by a first bolt 6. The second limit ring 9 is connected to the receiving platform 7 by a second bolt 10. Among them, the second limit ring 9 is formed by splicing two semicircular rings. A mounting plate 20 is provided inside the semicircular ring. The mounting plate 20 is a semicircular structure and the circle where the semicircular structure and the semicircular ring are located are concentric circles. The side wall of the mounting plate 20 is covered with a rubber pad 21, and the rubber pad 21 is fixedly connected to the mounting plate 20. By providing the rubber pad 21 , damage to the acoustic device 24 during the descending process can be effectively avoided, and the width of the rubber pad 21 can be adjusted to accommodate acoustic devices 24 of different specifications.

[0064] The adapter plate 12 is located at the top of the limit assembly and is used to connect the acoustic device 24. In this embodiment, the acoustic device 24 is a cylindrical structure, and the top diameter of the acoustic device 24 is larger than the bottom diameter. During the descent of the acoustic device 24, the side wall is clamped with the second limit ring 9 to rubber-coat the position below the second limit ring 9, and the bottom of the adapter plate 12 is clamped with the top of the acoustic device 24. The clamping method can be selected according to the specific structure of the top of the acoustic device 24, which belongs to a conventional clamping method and is not limited here.

[0065] The fixed plate 11 is located at the top of the adapter plate 12, and a lifting assembly is arranged between the fixed plate 11 and the adapter plate 12, and the lifting assembly is used to drive the adapter plate 12 to rise or fall; a through hole is opened in the center of the fixed plate 11; the lifting assembly includes a threaded disk 15 and a screw 16, the threaded disk 15 is arranged inside the through hole and fixedly connected to the through hole, and the screw 16 passes through the threaded disk 15; a bearing 14 is arranged at the top center of the adapter plate 12, the outer ring of the bearing 14 is connected to the adapter plate 12, and the inner ring of the bearing 14 is interference fit with the bottom of the screw 16; the bottom of the adapter plate 12 is used to clamp the acoustic device 24. In this embodiment, a guide rod 13 is also arranged between the fixed plate 11 and the adapter plate 12, the bottom of the guide rod 13 is fixedly connected to the adapter plate 12, and the top of the guide rod 13 passes through the fixed plate 11 and is slidably connected to the fixed plate 11. During the rising process of the adapter plate 12, the guide rod 13 also rises accordingly, and at this time, the guide rod 13 slides and rises relative to the fixed plate 11. A plurality of positioning holes 8 are also provided on the edge of the fixed plate 11, and guide columns 19 are provided in three positioning holes 8. The guide columns 19 sequentially penetrate the positioning ring 2, the first limiting ring 5, and the fixed plate 11, and the two ends of the guide columns 19 are fixedly connected to the positioning holes 8 of the positioning ring 2 and the fixed plate 11, respectively.

[0066] In this embodiment, the top of the positioning ring 2 is higher than the top of the lower mold 1, and a recessed area 22 is formed at the top of the lower mold 1. A convex ring 23 is provided at the bottom of the first limiting ring 5, and the convex ring 23 is clamped inside the recessed area 22. In order to facilitate the rotation of the screw 16, in this embodiment, a torsion short column 17 is also provided on the top of the screw 16, and a wrench 18 is sleeved on the outside of the torsion short column 17. The screw 16 is driven to rotate by rotating the wrench 18, and then the adapter plate 12 is lifted or lowered to complete the position adjustment of the acoustic device 24. It should be noted that when the acoustic device 24 rises, a gap is generated between the acoustic device 24 and the lower mold, which can be used to pour the sound-permeable rubber into the lower mold 1. When the acoustic device 24 descends, a rubber pad 21 of a suitable width is selected according to the specifications of the acoustic device 24. When the side wall of the acoustic device 24 abuts against the rubber pad 21, the acoustic device 24 stops descending.

[0067] Based on the structural design of the vulcanization mold, the polyurethane sound-transmitting rubber vulcanization process of the present invention comprises the following steps:

[0068] Step 1: sandblasting, cleaning, preheating, and applying adhesion promoter on the surface of the acoustic device 24;

[0069] Step 2: Wrap the top of the acoustic device (24) with a high-temperature tape (26) and ensure that the upper edge of the high-temperature tape is higher than the top of the acoustic device (24), and put the acoustic device (24) into an oven for preheating at a temperature of 60° C. for 35 minutes;

[0070] Step 3: Weigh the required amount of polyurethane sound-permeable rubber and filter it, then put it into another oven for preheating at 55°C for 35 minutes;

[0071] Step 4: Vacuum the preheated polyurethane sound-transmitting rubber to remove bubbles, and heat and melt the chain extender MOCA required for the polyurethane sound-transmitting rubber. When MOCA is melted and the temperature is 120°C, put the polyurethane sound-transmitting rubber into the stirrer and start high-speed stirring. While stirring, slowly pour MOCA into the rubber material, and rotate the rubber barrel and the stirring rod in the opposite direction for 3 minutes;

[0072] Step 5: Degas the glue solution obtained in step 4 for the second time until no bubbles are generated on the surface of the glue solution;

[0073] Step 6: Take an appropriate amount of the glue prepared in step 5, pour it on the top of the acoustic device (24), put it into an oven, heat it to 50° C., bake it for 75 hours, and then cool it down to room temperature;

[0074] Step 7: Apply an adhesion promoter to the remaining area to be vulcanized (25);

[0075] Step 8: Invert the acoustic device (24) and fix it with the lifting component. The lifting component drives the adapter plate and then drives the acoustic device 24 to rise, so that a gap is left between the acoustic device 24 and the lower mold 1; take an appropriate amount of the glue prepared in step 5 and pour it into the lower mold 1 through the gap; the lifting device drives the adapter plate and then drives the acoustic device 24 to descend, so that the side wall of the acoustic device 24 abuts against the limit component, and the acoustic device 24 located below the limit component is immersed in the lower mold 1 and covered by the glue; remove the excess glue overflowing from the inner circle, put the assembled product into the oven for heating, the molding vulcanization temperature is 60°C, and the vulcanization time is 50 hours; after the vulcanization is completed, the rubber surface is polished.

[0076] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A polyurethane sound-transmitting rubber vulcanization process, characterized in that: The following steps are involved: Step 1: pre-treating the surface of the area to be vulcanized (25) of the acoustic device (24); Step 2: Wrap the top of the acoustic device (24) with a high-temperature tape (26) and ensure that the upper edge of the high-temperature tape is higher than the top of the acoustic device (24), and place the acoustic device (24) in an oven for preheating; Step 3: Weigh the required amount of polyurethane sound-transmitting rubber and filter it, and put it into another oven for preheating; Step 4: Vacuum the preheated polyurethane sound-transmitting rubber to remove bubbles, and heat and melt the chain extender MOCA required for the polyurethane sound-transmitting rubber. When MOCA is melted and the temperature is 100°C-140°C, put the polyurethane sound-transmitting rubber into the stirrer and start high-speed stirring. While stirring, slowly pour MOCA into the rubber material; Step 5: Degas the glue solution obtained in step 4 for the second time until no bubbles are generated on the surface of the glue solution; Step 6: Take an appropriate amount of the glue prepared in step 5, pour it on the top of the acoustic device (24), put it into an oven, heat it to 40-70° C., bake it for 50-90 hours, and then cool it down to room temperature; Step 7: Apply an adhesion promoter to the remaining area to be vulcanized (25); Step 8: Pour an appropriate amount of the glue prepared in step 5 into a vulcanization mold, invert the acoustic device (24) and immerse it in the glue to complete vulcanization; Step 9: Grind the rubber surface after pre-vulcanization.

2. A polyurethane sound-transmitting rubber vulcanization process according to claim 1, characterized in that: The vulcanization mold in step 6 includes: A lower mold (1), wherein the lower mold (1) is a truncated cone structure with a hollow interior and an open top; A limiting component, used for limiting the position of the acoustic device (24), wherein the limiting component is located at the top of the lower mold (1) and is fixedly connected to the lower mold (1); An adapter plate (12), located on the top of the limiting assembly, and used for connecting the acoustic device (24); A fixed plate (11) is located on the top of the adapter plate (12), and a lifting assembly is provided between the fixed plate (11) and the adapter plate (12), wherein the lifting assembly is used to drive the adapter plate (12) to rise or fall; The edges of the lower mold (1), the limiting assembly, and the fixed plate (11) are all provided with a plurality of positioning holes (8), and guide columns (19) are arranged in at least three of the positioning holes (8). The guide columns (19) sequentially penetrate the lower mold (1), the limiting assembly, and the fixed plate (11), and the two ends of the guide columns (19) are respectively fixedly connected to the positioning holes (8) of the lower mold (1) and the fixed plate (11); The step 8 comprises: The lifting assembly drives the adapter plate and then drives the acoustic device (24) to rise, so that a gap is left between the inverted acoustic device (24) and the lower mold; Take an appropriate amount of the glue prepared in step 5 and pour it into the lower mold (1) through the gap; The lifting device drives the adapter plate and then drives the acoustic device (24) to descend, so that the side wall of the acoustic device (24) abuts against the limiting component, and the acoustic device (24) located below the limiting component is immersed in the lower mold (1) and is covered by the glue to complete the vulcanization.

3. A polyurethane sound-transmitting rubber vulcanization process according to claim 2, characterized in that: A positioning ring (2) is arranged on the outer side of the top of the lower mold (1), and a plurality of connecting grooves are evenly arranged on the positioning ring (2) along the circumferential direction. A fixing pin (3) is arranged inside the connecting groove, and one end of the fixing pin (3) is connected to the positioning ring (2), and the other end of the fixing pin (3) is connected to the top of the lower mold (1); The positioning hole (8) of the lower mold (1) is opened on the positioning ring (2).

4. A polyurethane sound-transmitting rubber vulcanization process according to claim 3, characterized in that: The limiting assembly comprises a first limiting ring (5) and a second limiting ring (9); The edge of the first limiting ring (5) is provided with a plurality of positioning holes (8) along the circumferential direction, and an annular receiving platform (7) is provided inside the first limiting ring (5), and the receiving platform (7) and the first limiting ring (5) are integrally formed; The positioning ring (2) is provided with a connecting block (4); the first limiting ring (5) is connected to the connecting block (4) via a first bolt (6); and the second limiting ring (9) is connected to the receiving platform (7) via a second bolt (10).

5. A polyurethane sound-transmitting rubber vulcanization process according to claim 4, characterized in that: The top of the positioning ring (2) is higher than the top of the lower mold (1), and a recessed area (22) is formed on the top of the lower mold (1). A convex ring (23) is provided at the bottom of the first limiting ring (5), and the convex ring (23) is clamped inside the recessed area (22).

6. A polyurethane sound-transmitting rubber vulcanization process according to claim 5, characterized in that: The second limiting ring (9) is formed by splicing two semicircular rings; a mounting plate (20) is arranged inside the semicircular ring, the mounting plate (20) is a semicircular structure, and the circle where the semicircular structure and the semicircular ring are located are concentric circles; The side wall of the mounting plate (20) is covered with a rubber pad (21), and the rubber pad (21) is fixedly connected to the mounting plate (20).

7. A polyurethane sound-transmitting rubber vulcanization process according to claim 6, characterized in that: A through hole is formed in the center of the fixing plate (11); The lifting assembly comprises a threaded disc (15) and a screw rod (16), wherein the threaded disc (15) is arranged inside the through hole and fixedly connected to the through hole, and the screw rod (16) passes through the threaded disc (15); A bearing (14) is arranged at the top center of the adapter plate (12); the outer ring of the bearing (14) is connected to the adapter plate (12); the inner ring of the bearing (14) is interference fit with the bottom of the screw rod (16); and the bottom of the adapter plate (12) is used to clamp the acoustic device (24).

8. The polyurethane sound-transmitting rubber vulcanization process according to claim 7, characterized in that: A guide rod (13) is also provided between the fixed plate (11) and the adapter plate (12); the bottom of the guide rod (13) is fixedly connected to the adapter plate (12), and the top of the guide rod (13) passes through the fixed plate (11) and is slidably connected to the fixed plate (11).

9. A polyurethane sound-transmitting rubber vulcanization process according to claim 8, characterized in that: A twisting short column (17) is arranged at the top of the screw rod (16), and a wrench (18) is sleeved on the outer side of the twisting short column (17).

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