Composite material sound pot for strong sound repellent device and preparation method thereof

Abstract

The application discloses a strong sound and light repelling system composite material sound basin and a preparation method thereof, and belongs to the technical field of strong sound repelling and driving away equipment. The strong sound and light repelling system composite material sound basin has an integrated multi-element conical structure, is manufactured from high-strength, high-modulus and high-toughness fiber fabric and a high-toughness and high-damping epoxy resin system, and has the advantages of high overall structural strength, high rigidity, good damping property, high stability, outstanding sound intensity, excellent sound directivity and clearness of shouting and the like. The preparation method of the strong sound and light repelling system composite material sound basin comprises the following steps: designing and preparing a mold comprising an integrated multi-element conical cavity, manufacturing by using a vacuum adsorption pouring forming process, impregnating prepared epoxy resin into a preformed body, and finally forming the strong sound and light repelling system composite material sound basin in an integral manner. The strong sound and light repelling system composite material sound basin has the advantages of simple forming process and low cost.

Description

Technical Field

[0001] This invention belongs to the technical field of high-intensity acoustic deterrence and expulsion devices, specifically relating to a composite material cone for a high-intensity acoustic deterrence and expulsion device and its preparation method. Background Technology

[0002] A high-intensity acoustic deterrence device is a device that emits a highly directional, concentrated beam of sound waves. The cone is a crucial sound-transmitting component in this system. A voice coil fixed to the cone vibrates strongly in a magnetic field after an audio signal is applied, simultaneously causing the cone to vibrate. This vibration forces the air to vibrate, thus producing sound. The material and manufacturing process of the cone significantly influence the electroacoustic performance and system stability of the high-intensity acoustic deterrence system, including its resonant frequency, effective frequency, sound intensity, sensitivity, and distortion, thereby greatly affecting the deterrence effect.

[0003] Currently, there are few reports on the materials used for the cones of high-volume deterrent devices. Some reports mention the use of polypropylene, a relatively inexpensive material. However, cones made with this material and the corresponding processing techniques are prone to uneven thickness, with the minimum thickness area often failing to meet the required thickness. Furthermore, this material generally has low strength, stiffness, and damping, making it unable to achieve high sound intensity and prone to resonance, resulting in poor clarity of speech and affecting the overall performance. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a composite material cone for a high-intensity sound deterrent device and its preparation method.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: the cone of the composite material is designed as an integral multi-conical structure; according to the structure of the composite material cone, a mold including an integral multi-conical cavity is designed and prepared; the integral molding is manufactured by using fiber fabric and prepared epoxy resin with the help of vacuum adsorption injection molding process, thereby achieving the purpose of the present invention.

[0006] The present invention also relates to a composite material cone for a high-intensity sound deterrent device, which is made of fiber fabric and epoxy resin, including a top plate outer edge and an integral multi-conical cone body; the top plate outer edge is located on the top outer side of the cone body; each cone body has a protrusion at the center of its bottom, and a connecting hole is provided around the bottom of the protrusion; the top plate outer edge is provided with a connecting hole.

[0007] Preferably, the fiber fabric includes plain weave aramid fiber fabric, twill weave aramid fiber fabric, and aramid-carbon hybrid fiber fabric, with an areal density of 100 g / m³. 2 ~400g / m 2 .

[0008] Preferably, the epoxy resin has a viscosity ≤500 mPa·s at room temperature and a loss factor of 0.70–0.85 for the cured product. It is composed of 20–50 parts by weight of TDE-85 epoxy resin, 50–80 parts by weight of E-51 epoxy resin, 15–30 parts by weight of reactive epoxy diluent, and 40–50 parts by weight of T403 curing agent.

[0009] This invention also relates to a method for preparing a composite material cone for a high-intensity acoustic deterrent device, the operation steps of which are as follows:

[0010] 1) Mold preparation and processing: The mold includes a multi-element conical cavity that matches the number and structure of the conical basin and a flat plate located on the outer side of the top of the conical cavity; the mold surface is smooth and flat, and a release agent is applied before use;

[0011] 2) Preparation of composite material cone preform: Cut the fiber fabric according to the design requirements; lay the fiber fabric along the cone-shaped cavity surface as a whole, and fix it with a setting agent. The overlapping parts between adjacent layers are staggered to obtain the composite material cone preform.

[0012] 3) Preparation of composite material cone blanks: Epoxy resin components are prepared in proportion, mixed evenly and degassed, and then the cone preform is impregnated using vacuum adsorption casting molding process to prepare composite material cone blanks.

[0013] 4) Post-processing: Trim the edges of the cone blank, improve local micro-pore defects, spray paint, and make the finished composite material cone for the strong sound rejection drive.

[0014] Preferably, the epoxy resin has a viscosity ≤500 mPa·s at room temperature and a loss factor of 0.70 to 0.85 for the cured product. It is made of 20 to 50 parts by weight of TDE-85 epoxy resin, 50 to 80 parts by weight of E-51 epoxy resin, 15 to 30 parts by weight of reactive epoxy diluent, and 40 to 50 parts by weight of T403 curing agent.

[0015] More preferably, the reactive epoxy diluent is 678 or 669 reactive epoxy diluent.

[0016] Preferably, during the preparation of the composite material cone blank, the epoxy resin is cured at room temperature.

[0017] Preferably, during the preparation of the composite material cone blank, the epoxy resin is cured in a temperature environment heated to 80°C.

[0018] In a further preferred embodiment, during the preparation of the composite material cone blank, the epoxy resin is heated by setting a graphene flexible electrothermal film on the composite material cone preform.

[0019] More preferably, the graphene flexible electrothermal film begins heating after the resin injection is completed.

[0020] The composite material speaker cone of the high-intensity sound and light repellent system of this invention features an integrated multi-conical structure. It is manufactured using high-strength, high-modulus, and high-toughness fiber fabric and a high-toughness, high-damping epoxy resin system. This results in high overall structural strength, high rigidity, good damping, strong stability, outstanding sound intensity, excellent sound directivity, and clear speech. It overcomes the shortcomings of existing speaker cones made from engineering plastics such as polypropylene, which suffer from low sound intensity and susceptibility to resonance. The manufacturing method of the composite material speaker cone of this invention involves designing and preparing a mold including an integrated multi-conical cavity. Cut fiber fabric is laid integrally within the mold cavity to form a preform. Vacuum adsorption casting molding is then used to impregnate the preform with prepared epoxy resin. After curing and post-treatment, the final composite material speaker cone for the high-intensity sound and light repellent system is formed. This method offers advantages such as simple molding process and low cost.

[0021] Instruction manual illustrations

[0022] Figure 1 This is a schematic diagram of the composite material basin structure in Example 1;

[0023] Figure 2 This is a top view of the composite material basin from Example 1;

[0024] Figure 3 This is a cross-sectional view of the composite material basin in Example 1.

[0025] Among them, 1—outer edge of the top plate, 2—connecting hole, 3—protrusion, 4—upright side, 5—conical basin. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Example 1

[0028] A composite material cone for a high-intensity acoustic deterrence system has a ternary structure with equal wall thickness, consisting of a top flat outer edge 1 and three integrally formed conical cones 5. The top flat outer edge 1 is located on the outer side of the top of the conical cones 5. Figures 1 to 3 As shown. Each conical basin 5 has a protrusion 3 at the center of its bottom for placing the sound-generating component; four connecting holes 2 are evenly distributed around the bottom of the protrusion 3 for fixing the sound-generating component; an upright side 4 is provided at the top of the side wall to define the horizontal position of the conical basin 5 in the inner cavity of the outer shell. The outer edge 1 of the top plate is located above the outer shell to define the vertical position of the conical basin 5 in the inner cavity of the outer shell and to facilitate placement and removal; the outer edge 1 of the top plate has four connecting holes 2 for fixing it to the outer shell.

[0029] The composite material cone of the high-intensity acoustic deterrence system in this embodiment is made of epoxy resin-based composite material reinforced with high-toughness, high-damping aramid fiber fabric. The specific steps are as follows:

[0030] Mold preparation and processing. A mold was designed and prepared based on the composite material cone structure. The mold consists of three integrally formed conical cavities and a flat plate located on the outer top of each conical cavity, and is made of metal. The mold was cleaned, and a release agent was applied to its surface.

[0031] Preparation of composite material cone preform. Aramid fiber fabric is cut and laid along the conical cavity surface. It is then shaped with a setting agent. The overlaps between adjacent layers are staggered. A total of 8 layers are laid to obtain the composite material cone preform.

[0032] Resin system preparation. Weigh 20 parts of TDE-85 epoxy resin, 80 parts of E-51 epoxy resin, 15 parts of 669 reactive diluent and 40 parts of T403 curing agent, mix them evenly to prepare an epoxy resin system with a viscosity of 500 mPa·s at room temperature and a loss factor of 0.70 for the cured product.

[0033] Vacuum adsorption injection molding of composite material cone blanks. A release cloth and a flow guide net are laid on the surface of the prepared composite material cone preform. Flow guide pipes and injection bases are placed on both sides, along with injection and dispensing pipes. A vacuum bag is then sealed. After vacuum degassing of the prepared resin solution, it is injected using a vacuum pump. Once the entire surface of the composite material cone preform is impregnated with epoxy resin solution, the injection port valve is closed, and vacuum is maintained. A graphene flexible electrothermal film is placed on the surface of the vacuum bag, ensuring close contact with the composite material cone surface. The temperature is set to 80℃, and curing is performed at this temperature for 2 hours. After the composite material cone cools naturally to room temperature, demolding is performed to obtain the aramid composite material cone blank.

[0034] Post-processing. The obtained composite material cone blank is cut at all four corners to obtain a regular composite material cone component that meets the size requirements. The surface smoothness of the inner cavity of the cone is checked, and local pits are repaired with putty. After the repair is completed, the surface is painted to obtain the finished composite material cone.

[0035] The composite material cone for the high-intensity sound rejection and dispersal system prepared in this embodiment is made of aramid fiber fabric reinforced with epoxy resin, which is composed of high-strength, high-modulus, and high-toughness aramid fiber fabric and a high-toughness, high-damping epoxy resin system. The overall structure has high strength, high rigidity, good damping, and strong stability. The sound intensity is up to 160dB / m, the effective voice broadcasting distance is ≥2km, and the dispersal distance is ≥550m. The overall thickness of the cone is relatively uniform with an error of ≤0.5mm. The minimum thickness area can meet the product requirements and there is no resonance phenomenon.

[0036] Example 2:

[0037] The composite material cone structure of the high-volume deterrence and dispersal system in this embodiment is the same as that in Embodiment 1.

[0038] The composite material cone of the high-intensity acoustic deterrence system in this embodiment is made of epoxy resin-based composite material reinforced with high-toughness, high-damping aramid fiber fabric. The specific steps are as follows:

[0039] Mold preparation and processing. Based on the composite cone structure design, a mold was prepared. The mold comprises three integrally formed conical cavities and a flat plate located on the outer top of each conical cavity. It was prepared using a low-temperature curing, high-temperature application epoxy resin / fiber-reinforced resin matrix composite material. The mold was cleaned, and a release agent was applied to the mold surface.

[0040] Preform preparation. Aramid fiber fabric is cut and laid along the conical cavity surface with twill aramid fiber fabric. It is then shaped with a setting agent. The overlaps between adjacent layers are staggered. A total of 20 layers are laid to obtain the cone preform.

[0041] Resin system preparation. Weigh 50 parts of TDE-85 epoxy resin, 50 parts of E-51 epoxy resin, 30 parts of 669 reactive diluent and 50 parts of T403 curing agent, mix them evenly to prepare an epoxy resin system with a viscosity of 300 mPa·s at room temperature and a loss factor of 0.85 for the cured product.

[0042] Vacuum adsorption injection molding of composite material cone blanks. A release cloth and a flow guide net are laid on the surface of the prepared composite material cone preform. Flow guide pipes and injection bases are placed on both sides, along with injection and dispensing lines. A vacuum bag is then sealed. After vacuum degassing of the prepared resin solution, it is injected using a vacuum pump. Once the entire surface of the composite material cone preform is impregnated with epoxy resin solution, the injection port valve is closed, and vacuum is maintained. The mixture is cured at room temperature for 48 hours. After the cone cools naturally to room temperature, it is demolded to obtain the aramid composite material cone blank.

[0043] Post-processing. The obtained composite material cone blank is cut at all four corners to obtain a regular composite material cone component that meets the size requirements. The surface smoothness of the inner cavity of the cone is checked, and local pits are repaired with putty. After the repair is completed, the surface is painted to obtain the finished composite material cone.

[0044] The composite material cone for the high-intensity sound rejection and dispersal system prepared in this embodiment is made of aramid fiber fabric reinforced with epoxy resin, which is composed of high-strength, high-modulus, and high-toughness aramid fiber fabric and a high-toughness, high-damping epoxy resin system. The overall structure has high strength, high rigidity, good damping, and strong stability. The sound intensity is as high as 165dB / m, the effective voice broadcasting distance is ≥2km, and the dispersal distance is ≥550m. The overall thickness of the cone is relatively uniform with an error of ≤0.5mm. The minimum thickness area can meet the product requirements and there is no resonance phenomenon.

[0045] Example 3:

[0046] The composite material cone of the strong sound deterrence and dispersal system in this embodiment is a four-element structure, consisting of a top flat plate outer edge 1 and four integrally structured conical cones 5.

[0047] The composite material cone of the high-intensity acoustic deterrence system in this embodiment is made of epoxy resin-based composite material reinforced with high-toughness, high-damping aromatic carbon hybrid fiber fabric. The specific steps are as follows:

[0048] Mold preparation and processing. A mold was designed and prepared based on the composite material cone structure. The mold consists of four integrally formed conical cavities and a flat plate located on the outer side of the top of each conical cavity. The mold was cleaned, and a release agent was applied to the mold surface.

[0049] Preform preparation. Aramid fiber fabric is cut and laid along the conical cavity surface with aramid-carbon hybrid fiber fabric. It is then shaped with a setting agent. The overlaps between adjacent layers are staggered. A total of 12 layers are laid to obtain the cone preform.

[0050] Resin system preparation. Weigh 30 parts of TDE-85 epoxy resin, 70 parts of E-51 epoxy resin, 25 parts of 678 reactive diluent and 45 parts of T403 curing agent, mix them evenly to prepare an epoxy resin system with a viscosity of 400 mPa·s and a loss factor of 0.75 for the cured product.

[0051] Vacuum adsorption injection molding of composite material cone blanks. A release cloth and a flow guide net are laid on the surface of the prepared composite material cone preform. Flow guide pipes and injection bases are placed on both sides, along with injection and dispensing lines. A vacuum bag is then sealed. After vacuum degassing the prepared resin solution, it is injected using a vacuum pump. Once the entire surface of the composite material cone preform is impregnated with epoxy resin solution, the injection port valve is closed, and vacuum is maintained. A graphene flexible electrothermal film is placed on the surface of the vacuum bag, ensuring close contact with the cone surface. The temperature is set to 80℃, and curing is performed at this temperature for 2 hours. After the composite material cone cools naturally to room temperature, demolding is performed to obtain an aromatic carbon hybrid composite material cone blank.

[0052] Post-processing. The obtained composite material cone blank is cut at all four corners to obtain a regular cone component that meets the size requirements. The surface smoothness of the inner cavity of the composite material cone is checked. Local pits are repaired with putty. After the repair is completed, the surface is painted to obtain the finished composite material cone.

[0053] The composite material cone for the high-intensity sound rejection and dispersal system prepared in this embodiment is made of an aramid-carbon hybrid fiber fabric reinforced with epoxy resin, consisting of a high-strength, high-modulus, and high-toughness aramid fiber fabric and a high-toughness, high-damping epoxy resin system. The overall structure has high strength, high rigidity, good damping, and strong stability. The sound intensity is as high as 163dB / m, the effective voice broadcasting distance is ≥2km, and the dispersal distance is ≥550m. The overall thickness of the cone is relatively uniform, with an error of ≤0.5mm. The minimum thickness area can meet the product requirements, and no resonance phenomenon will occur.

Claims

1. A composite material cone for a high-intensity acoustic deterrent device, characterized in that: Made of fiber fabric and epoxy resin, it includes a top plate outer edge (1) and an integral multi-conical basin (5); the top plate outer edge (1) is located on the outer side of the top of the conical basin (5); each conical basin (5) has a protrusion (3) at the center of its bottom, the protrusion (3) facing inward, and connection holes (2) are provided around the bottom; the top of the side wall has an upright side (4); the top plate outer edge (1) has connection holes (2); the fiber fabric includes plain weave aramid fiber fabric, twill weave aramid fiber fabric and aramid-carbon hybrid fiber fabric, with a surface density of 100 g / m³. 2 ~400g / m 2； The epoxy resin has a viscosity ≤500 mPa·s at room temperature and a loss factor of 0.70 to 0.85 for the cured product. It is made of 20 to 50 parts by weight of TDE-85 epoxy resin, 50 to 80 parts by weight of E-51 epoxy resin, 15 to 30 parts by weight of reactive epoxy diluent and 40 to 50 parts by weight of T403 curing agent.

2. A method for preparing the composite material cone for the high-intensity acoustic deterrent device according to claim 1, characterized in that: The operation steps are as follows: 1) Mold preparation and processing: The mold includes a multi-element conical cavity that matches the number and structure of the conical basin (5) and a flat plate located on the outer side of the top of the conical cavity; the mold surface is smooth and flat, and a release agent is applied before use; 2) Preparation of composite material cone preform: Cut the fiber fabric according to the design requirements; lay the fiber fabric along the cone-shaped cavity surface as a whole, and fix it with a setting agent. The overlapping parts between adjacent layers are staggered to obtain the composite material cone preform. 3) Preparation of composite material cone blanks: Epoxy resin components are prepared in proportion, mixed evenly and degassed, and then the cone preform is impregnated using vacuum adsorption casting molding process to prepare composite material cone blanks. 4) Post-processing: Trim the edges of the cone blank, improve local micro-pore defects, spray paint, and make the finished composite material cone for the strong sound rejection drive.

3. The method for preparing the composite material cone for the high-intensity acoustic deterrent device according to claim 2, characterized in that: The reactive epoxy diluent is 678 or 669 reactive epoxy diluent.

4. The method for preparing the composite material cone for the high-intensity acoustic deterrent device according to claim 2, characterized in that: During the preparation of the composite material cone blank, the epoxy resin is cured at room temperature.

5. The method for preparing the composite material cone for the high-intensity acoustic deterrent device according to claim 2, characterized in that: During the preparation of the composite material cone blank, the epoxy resin is cured in a temperature environment heated to 80°C.

6. The method for preparing the composite material cone for the high-intensity acoustic deterrent device according to claim 5, characterized in that: During the preparation of the composite material cone blank, the epoxy resin is heated by setting a graphene flexible electrothermal film on the composite material cone preform.

7. The method for preparing the composite material cone for the high-intensity acoustic deterrent device according to claim 6, characterized in that: The graphene flexible electrothermal film begins heating after the resin injection is completed.

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