Small and light detonating cord explosion isolation device and its forming and detonating cord assembly method

Abstract

The application discloses a small and light detonating cord explosion isolation element and a forming and detonating cord assembling method thereof, which comprises a hollow cylinder, the surface of the hollow cylinder is provided with an entering cord groove, a thread groove and an exiting cord groove, and the entering cord groove, the thread groove and the exiting cord groove are communicated; the hollow cylinder surface multi-turn thread groove, the entering cord groove and the exiting cord groove can orderly receive and wind the detonating cord, so that the wiring path of the detonating cord in a narrow space can be planned, and the shock wave generated by the explosion of the detonating cord can be effectively absorbed in combination with the structural design of the hollow cylinder and the characteristics of the polyurethane porous material; the hollow cylinder is prepared from the polyurethane material, has the light weight characteristic, and the light weight design is beneficial to the weight reduction and portability improvement of the overall equipment; the foaming forming process is adopted, and the manufacturing process is simple and easy to operate; the mold cavity structure is adjusted in a modularized mode, and the universality and adaptability of the explosion isolation element are improved.

Description

Technical Field

[0001] This invention relates to the field of structural components, specifically to a small, lightweight detonating cord explosion-proof component and its forming and detonating cord assembly method. Background Technology

[0002] In the field of ammunition equipment, tandem warheads are the core technology for achieving efficient damage to armored targets. Their core design logic lies in achieving continuous relay penetration of the target through precise time delay of multi-stage explosive charges, thereby significantly improving damage effectiveness. Detonating cord, as a key component for achieving this precise time delay, can accurately control the detonation delay time due to its stable detonation velocity transmission characteristics. It has become the core support for ensuring the timing coordination of each stage of the warhead in tandem warheads. For example, the silver detonating cord widely used in the industry has stable detonation velocity transmission performance that can meet the stringent timing control requirements of tandem warheads.

[0003] From a technical perspective, the application of detonating cord provides crucial support for the functional realization of tandem warheads. On the one hand, through the combination of length design and detonation velocity characteristics, it can precisely control the detonation interval of multi-stage charges, ensuring that after the preceding warhead completes its preset tasks such as breaching obstacles and creating openings, the subsequent warhead can detonate at the optimal time, maximizing its destructive effectiveness. On the other hand, its structural characteristics can adapt to the compact integration requirements of tandem warheads, providing a feasible solution for the layout of multi-stage charges and the planning of detonation paths. It is the core link connecting timing control and damage realization in the tandem warhead technical system. However, in practical engineering applications, the aforementioned advantages of detonating cord have created a prominent contradiction with the multiple design constraints of tandem warheads. These contradictions directly restrict the further improvement of the performance of tandem warheads, specifically in the following aspects:

[0004] Firstly, in existing tandem warheads, the detonating cord is usually placed directly inside the warhead without a dedicated storage and explosion-proof structure. Since the detonating cord needs to be of a certain length to achieve precise delay, it is difficult to plan a reasonable wiring path for an excessively long cord in a confined space, which can easily lead to problems such as tangling and difficulty in fixing, affecting assembly consistency and production efficiency. At the same time, the shock wave generated by the detonating cord explosion lacks effective protection and can easily damage surrounding precision ammunition components, reducing the overall reliability of the warhead.

[0005] Secondly, many traditional explosion-proof components are made of metal or high-density composite materials. These materials are dense and lack targeted weight-reduction considerations in their structural design, resulting in excessive weight and hindering the lightweight development of ammunition and equipment. Some explosion-proof materials also have insufficient chemical compatibility, which may react with common metal components in warheads such as copper, iron, aluminum, and silver, affecting performance and safety stability. In addition, traditional explosion-proof components have limited heat insulation, making it difficult to prevent the high temperatures generated by the detonating cord explosion from affecting surrounding components.

[0006] Third, the existing explosion-proof components have complex molding processes and are difficult to adjust in terms of size and specifications; the space requirements of different specifications of detonating cords or different application scenarios are difficult to meet in a timely manner, resulting in insufficient adaptability.

[0007] Therefore, it is very necessary to design a small and lightweight detonating cord explosion-proof component and its molding and detonating cord assembly method; Summary of the Invention

[0008] The purpose of this invention is to provide a small, lightweight detonating cord explosion-proof component and its molding and detonating cord assembly method, in order to solve the problems mentioned in the background art, such as the lack of a dedicated explosion-proof structure for storing the detonating cord in existing tandem warheads, which leads to difficulties in wiring path planning and the easy damage of shock waves to surrounding precision ammunition components; the high density of traditional explosion-proof materials, insufficient chemical compatibility, and limited heat insulation effect; and the complex molding process and difficulty in adjusting the size of the explosion-proof component, which leads to insufficient adaptability.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] In a first aspect, a small and lightweight detonating cord explosion-proof component is provided, including a hollow cylinder, the surface of which is provided with an inlet cord groove, a threaded groove and an outlet cord groove, the inlet cord groove, the threaded groove and the outlet cord groove being connected to each other.

[0011] The hollow cylinder has a central cavity that runs through both ends. The wall thickness of the hollow cylinder can be adjusted according to the explosion-proof performance requirements. By optimizing the matching relationship between the wall thickness and the overall size, the weight reduction can be further improved while ensuring the explosion-proof effect.

[0012] The inlet groove is the entry point for the detonating cord, the outlet groove is the exit point for the detonating cord, and the threaded groove is used to receive the detonating cord.

[0013] As a further technical solution of the present invention, the hollow cylinder is made of polyurethane. Polyurethane is selected as the preparation material because it has good chemical stability, explosion-proof performance and foaming molding characteristics, and can form a porous explosion-proof component with both strength and lightweight through the foaming process.

[0014] As a further technical solution of the present invention, the polyurethane has a porous structure and does not react with copper, iron, aluminum and silver. The porous structure is formed by a foaming molding process, and the pores are evenly distributed. It can effectively block the explosive impact and heat conduction, and further reduce the weight of the explosion-proof component. Its characteristic of not reacting with some metals ensures the chemical stability of the explosion-proof component in complex assembly environments.

[0015] As a further technical solution of the present invention, the width, depth, and spacing of the threaded grooves, as well as the diameter, height, and central cavity diameter of the hollow cylinder, are all achieved by adjusting the mold cavity structure. The width, depth, and spacing of the threaded grooves are adapted to the detonating cord specifications, and the diameter, height, and central cavity diameter of the hollow cylinder match the requirements of the application scenario. A modular mold cavity design is adopted, and the dimensions of various parts of the explosion-proof component can be adjusted by replacing the cavity modules of different sizes without the need to re-open the mold, which greatly improves the flexibility and economy of production, while ensuring the forming accuracy of explosion-proof components of different specifications.

[0016] Secondly, a method for molding a small, lightweight detonating cord explosion-proof component and assembling the detonating cord is provided, comprising the following steps:

[0017] S1: Size determination: Based on the requirements of the target application scenario, determine the diameter, height, central cavity diameter, and width, depth, and spacing of the threaded grooves of the hollow cylinder. Through precise analysis of the detonating cord specifications and application scenarios, clarify the design basis of each size parameter, provide accurate size reference for subsequent molding processes, and ensure that the molded explosion-proof component can fully adapt to the detonating cord and application environment.

[0018] S2: Raw Material Preparation and Pretreatment: Polyols, isocyanates, foaming agents, catalysts, flame retardants, and plasticizers are selected. The polyols are dehydrated, and the raw material temperature is controlled within a preset range. The polyols used are polyether polyols or polyester polyols. The catalysts include amine catalysts and tin catalysts. The foaming agents include chemical foaming agents or physical foaming agents. The polyether polyol selected is grade 330N, the isocyanate is MDI-100, the foaming agent is HCFC-22 or pentane, and the catalyst is triethylenediamine or dibutyltin dilaurate. Dehydration of the polyols is to avoid side reactions between water and isocyanates, ensuring the smooth progress of the foaming reaction. Strict control of the raw material temperature helps to ensure the uniformity of raw material mixing and the stability of the foaming process.

[0019] S3: Mold Preparation: Select aluminum alloy mold, steel mold, or silicone mold. Process or adjust the mold cavity according to the dimensions determined in S1, so that the inner wall contour, groove structure, and hollow channel of the cavity are precisely matched with the target dimensions of the outer wall, cable inlet groove, threaded groove, cable outlet groove, and central cavity of the hollow cylinder. After cleaning the mold surface, apply silicone or polytetrafluoroethylene release agent and preheat the mold. The use of modular cavity structure allows the mold to quickly adapt to the production needs of explosion-proof parts of different specifications, significantly shortening the mold change and adjustment time and reducing the cost of customized production.

[0020] S4: Raw material mixing and pouring: Measure each raw material according to the preset ratio, mix the raw materials using a high-pressure foaming machine, and quickly pour the mixed raw materials into the mold cavity. The pouring amount is reserved for foaming allowance. The use of a high-pressure foaming machine can achieve full mixing of raw materials and ensure the uniformity of the foaming reaction. The reserved foaming allowance takes into account the volume expansion during the polyurethane foaming process to ensure the dimensional accuracy of the explosion-proof parts after molding.

[0021] S5: Foaming and curing: The raw materials undergo polymerization and foaming processes within the mold. The mold temperature is maintained to ensure that the polymer chains are fully cross-linked and cured. If a segmented temperature control method and foaming time are used, a uniform porous structure can be formed. After curing, the material is demolded. The segmented temperature control method can adjust the mold temperature according to the different stages of foaming and curing to ensure the foaming quality and curing strength of the explosion-proof component, thereby ensuring its explosion-proof performance and structural stability.

[0022] S6: Curing treatment: Place the demolded product in a room temperature environment or oven for 24-48 hours to cure. Then remove the flash and burrs from the product. If necessary, cut, drill or surface coating process to obtain the explosion-proof part that meets the target size. Curing treatment is to further stabilize the performance of polyurethane products and ensure that their mechanical strength, chemical stability and explosion-proof performance meet the design requirements.

[0023] S7: Cleaning of explosion-proof components: Wipe the surface of the hollow cylinder and the inside of the threaded groove with anhydrous ethanol to remove dirt and dust, and let it dry completely after the anhydrous ethanol has evaporated.

[0024] S8: Detonating cord winding: Wind the detonating cord along the threaded groove so that the detonating cord is close to the bottom of the threaded groove. Temporarily fix the detonating cord at the inlet and outlet of the cord groove using a removable fixing method.

[0025] S9: Colloid Coating: Select the prepared epoxy resin adhesive and apply it to one side of the surface of the hollow cylinder. Use a single-edged blade to scrape along the cylindrical surface at a uniform speed so that the epoxy resin adhesive completely covers the contact area between the detonating cord and the threaded groove and evenly fills the threaded groove. Then use a single-edged blade to scrape off the excess epoxy resin adhesive on the surface of the hollow cylinder. The epoxy resin adhesive coating not only enables a firm connection between the detonating cord and the explosion-proof component, but also provides additional protection for the detonating cord. At the same time, it fills the gaps in the threaded groove and further improves the overall explosion-proof performance of the explosion-proof component.

[0026] S10: Static curing: Place the explosion-proof parts coated with epoxy resin on a flat platform and keep them undisturbed by external forces at room temperature to allow the adhesive to fully cure.

[0027] S11: Unfastening and Inspection: After the colloid has cured, remove the temporary fixing structures at the inlet and outlet of the detonating cord, observe the fixing status of the detonating cord, and complete the assembly of the detonating cord on the explosion-proof component.

[0028] As a further technical solution of the present invention, during the raw material pretreatment process, the moisture content of the polyol is controlled to be ≤0.2%, and the raw material temperature is controlled at 20-30℃; the mold preheating temperature is controlled at 30-50℃.

[0029] As a further technical solution of the present invention, the ratio of the amine catalyst to the tin catalyst is adjusted according to the balance requirements of the foaming reaction and the gelation reaction; the working pressure of the high-pressure foaming machine is 10-20MPa, and the mixing time is <0.5s.

[0030] As a further technical solution of the present invention, during the foaming and curing process, the temperature inside the mold is maintained at 40-60℃, and the curing time is adjusted according to the wall thickness of the hollow cylinder; the curing temperature of the oven is controlled at 60-80℃.

[0031] As a further technical solution of the present invention, the foaming allowance reserved in the pouring amount is 10%-20%; after the epoxy resin is coated, the static curing time of the explosion-proof component is ≥24 hours.

[0032] As a further technical solution of the present invention, the removable fixing method is binding fixing or clamping fixing.

[0033] Compared with existing technologies, the advantages of this small, lightweight detonating cord explosion-proof component and its molding and detonating cord assembly method are:

[0034] The explosion-proof component of this technical solution uses a layout of multiple threaded grooves, cable inlet grooves, and cable outlet grooves on the surface of a hollow cylinder to orderly store and wind the detonating cord, avoiding the difficulty in planning the wiring path in a confined space due to the excessive length of the detonating cord. At the same time, combined with the structural design of the hollow cylinder and the characteristics of polyurethane porous material, it can effectively absorb the shock wave generated by the explosion of the detonating cord, achieving reliable explosion-proof in a compact volume and meeting the needs of use in confined spaces.

[0035] This technical solution uses polyurethane material to prepare hollow cylinders. This material itself has lightweight properties, and the porous structure formed by foaming further reduces the weight of the explosion-proof component. At the same time, the hollow cavity design inside the hollow cylinder further reduces the amount of material used, thus achieving weight reduction. Moreover, the porous structure of polyurethane can enhance the heat insulation and explosion-proof effect. Its non-reactive properties with copper, iron, aluminum, and silver ensure the stable performance of the explosion-proof component when assembled with surrounding metal parts. Meanwhile, the lightweight design is conducive to the overall weight reduction and improved portability of the equipment.

[0036] This technical solution adopts a foam molding process, which is simple and easy to operate. By modularly adjusting the mold cavity structure, the width, depth, and spacing of the threaded grooves, as well as the diameter and height of the hollow cylinder, can be flexibly changed. It can quickly adapt to different detonating cord specifications and various application scenarios without re-molding, which saves production time and costs and improves the versatility and adaptability of explosion-proof components. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention;

[0038] Figure 2 This is a cross-sectional view of the device of the present invention;

[0039] Figure 3 This is a schematic diagram of the mold structure in the method of the present invention;

[0040] Figure 4 This is a schematic diagram of the detonating cord winding of the present invention;

[0041] Figure 5 This is a schematic diagram of the colloidal coating of the present invention;

[0042] Figure 6 This is a schematic diagram of the static curing process of the present invention;

[0043] Figure 7 This is a schematic diagram illustrating the release of the fixation mechanism according to the present invention;

[0044] Figure 8 This is a schematic diagram of the method flow of the present invention;

[0045] In the diagram: 1. Cable inlet groove; 2. Threaded groove; 3. Cable outlet groove; 4. Central cavity; 5. Hollow cylinder. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] Please see the appendix Figure 1 -Appendix Figure 2The present invention provides an embodiment 1: a small and lightweight detonating cord explosion-proof component, comprising a hollow cylinder 5, the hollow cylinder 5 being made of polyurethane. Polyurethane is selected as the material because it has good chemical stability, explosion-proof performance and foaming characteristics. It can form a porous explosion-proof component with both strength and lightweight through a foaming process. Polyurethane has a porous structure and does not react with copper, iron, aluminum and silver. The porous structure is formed by a foaming process, and the pores are evenly distributed. It can effectively block the explosive impact and heat conduction, and further reduce the weight of the explosion-proof component. Its characteristic of not reacting with some metals ensures the chemical stability of the explosion-proof component in complex assembly environments.

[0048] The surface of the hollow cylinder 5 is provided with an inlet cable groove 1, a threaded groove 2, and an outlet cable groove 3. The inlet cable groove 1, the threaded groove 2, and the outlet cable groove 3 are connected. The width, depth, and spacing of the threaded groove 2, as well as the diameter, height, and central cavity 4 of the hollow cylinder 5, are all achieved by adjusting the mold cavity structure. The width, depth, and spacing of the threaded groove 2 are adapted to the detonating cord specifications, and the diameter, height, and central cavity 4 of the hollow cylinder 5 are matched to the application scenario requirements. The modular mold cavity design allows for the adjustment of the dimensions of various parts of the explosion-proof component by replacing different sized cavity modules, without the need for re-molding. This greatly improves the flexibility and economy of production, while ensuring the forming accuracy of explosion-proof components of different specifications.

[0049] The hollow cylinder 5 has a central cavity 4 that runs through both end faces. The wall thickness of the hollow cylinder 5 can be adjusted according to the explosion-proof performance requirements. By optimizing the matching relationship between the wall thickness and the overall size, the weight reduction can be further improved while ensuring the explosion-proof effect.

[0050] The inlet groove 1 is the entry point for the detonating cord, the outlet groove 3 is the exit point for the detonating cord, and the threaded groove 2 is used to store the detonating cord.

[0051] Please see the appendix Figure 3 - Appendix Figure 8 The present invention provides an embodiment 2: a method for molding a small, lightweight detonating cord explosion-proof component and assembling the detonating cord, comprising the following steps:

[0052] S1: Size determination: Based on the requirements of the target application scenario, determine the diameter, height, bore diameter of the central cavity 4, and width, depth, and spacing of the threaded groove 2 of the hollow cylinder 5. Through precise analysis of the detonating cord specifications and application scenarios, clarify the design basis of each size parameter, provide accurate size reference for the subsequent molding process, and ensure that the molded explosion-proof component can fully adapt to the detonating cord and application environment.

[0053] S2: Raw Material Preparation and Pretreatment: Select polyols, isocyanates, foaming agents, catalysts, flame retardants, and plasticizers. Dehydrate the polyols and control the raw material temperature to a preset range. Use polyether polyols or polyester polyols. Catalysts include amine catalysts and tin catalysts. Foaming agents include chemical or physical foaming agents. For polyether polyols, select grade 330N; for isocyanates, select MDI-100; for foaming agents, select HCFC-22 or pentane; and for catalysts, select triethylenediamine and dibutyltin dilaurate. Pretreatment of the polyols is then carried out... Dehydration is performed to avoid side reactions between water and isocyanate, ensuring the smooth progress of the foaming reaction. Strict control of raw material temperature helps ensure uniform mixing and stability of the foaming process. During raw material pretreatment, the moisture content of the polyol is controlled to ≤0.2%, and the raw material temperature is controlled at 20-30℃. The mold preheating temperature is controlled at 30-50℃. The ratio of amine catalyst to tin catalyst is adjusted according to the balance requirements of the foaming and gelation reactions. The working pressure of the high-pressure foaming machine is 10-20MPa, and the mixing time is <0.5s.

[0054] S3: Mold Preparation: Select aluminum alloy mold, steel mold, or silicone mold. Process or adjust the mold cavity according to the dimensions determined in S1, so that the inner wall contour, groove structure, and hollow channel of the cavity are precisely matched with the target dimensions of the outer wall of the hollow cylinder 5, the cable inlet groove 1, the threaded groove 2, the cable outlet groove 3, and the central cavity 4. After cleaning the mold surface, apply silicone or polytetrafluoroethylene release agent and preheat the mold. The use of modular cavity structure allows the mold to quickly adapt to the production needs of explosion-proof parts of different specifications, significantly shortening the mold replacement and adjustment time and reducing the cost of customized production.

[0055] S4: Raw material mixing and casting: Measure each raw material according to the preset ratio, mix the raw materials using a high-pressure foaming machine, and quickly inject the mixed raw materials into the mold cavity. Allow for a foaming allowance in the casting volume. Using a high-pressure foaming machine ensures thorough mixing of the raw materials and guarantees the uniformity of the foaming reaction. The allowance is to account for the volume expansion during the polyurethane foaming process, ensuring the dimensional accuracy of the explosion-proof component after molding. The allowance for foaming in the casting volume is 10%-20%. After epoxy resin coating, the static curing time of the explosion-proof component is ≥24 hours.

[0056] S5: Foaming and Curing: The raw materials undergo polymerization and foaming processes within the mold. The mold temperature is maintained to ensure full cross-linking and curing of the polymer chains. If segmented temperature control and foaming time are used, a uniform porous structure is formed. After curing, the material is demolded. The segmented temperature control method can adjust the mold temperature according to the different stages of foaming and curing, ensuring the foaming quality and curing strength of the explosion-proof component, thereby guaranteeing its explosion-proof performance and structural stability. During the foaming and curing process, the temperature inside the mold is maintained at 40-60℃, and the curing time is adjusted according to the wall thickness of the hollow cylinder 5. The oven curing temperature is controlled at 60-80℃.

[0057] S6: Curing treatment: Place the demolded product in a room temperature environment or oven for 24-48 hours to cure. Then remove the flash and burrs from the product. If necessary, cut, drill or surface coating process to obtain the explosion-proof part that meets the target size. Curing treatment is to further stabilize the performance of polyurethane products and ensure that their mechanical strength, chemical stability and explosion-proof performance meet the design requirements.

[0058] S7: Cleaning of explosion-proof components: Wipe the surface of the hollow cylinder 5 and the inside of the threaded groove 2 with anhydrous ethanol to remove dirt and dust, and let it dry until the anhydrous ethanol has completely evaporated and the explosion-proof components are dry.

[0059] S8: Detonating cord winding: Wind the detonating cord along the threaded groove 2 so that the detonating cord is close to the bottom of the threaded groove 2. Temporarily fix the detonating cord at the inlet groove 1 and outlet groove 3 using a removable fixing method, such as binding or clamping.

[0060] S9: Glue Coating: Select the prepared epoxy resin adhesive and apply it to one side of the surface of the hollow cylinder 5. Use a single-edged blade to scrape along the cylindrical surface at a uniform speed so that the epoxy resin adhesive completely covers the contact area between the detonating cord and the threaded groove 2 and evenly fills the threaded groove 2. Then use a single-edged blade to scrape off the excess epoxy resin adhesive on the surface of the hollow cylinder 5. The coating of epoxy resin adhesive can not only achieve a firm connection between the detonating cord and the explosion-proof component, but also provide additional protection for the detonating cord. At the same time, it fills the gap of the threaded groove 2 and further improves the overall explosion-proof performance of the explosion-proof component.

[0061] S10: Static curing: Place the explosion-proof parts coated with epoxy resin on a flat platform and keep them undisturbed by external forces at room temperature to allow the adhesive to fully cure.

[0062] S11: Unfastening and Inspection: After the colloid has cured, remove the temporary fixing structures at the inlet cable groove 1 and outlet cable groove 3, observe the fixing status of the detonating cord, and complete the assembly of the detonating cord on the explosion-proof component.

[0063] Please see the appendix Figure 1 - Appendix Figure 5The present invention provides an embodiment 3: including a hollow cylinder 5, the surface of the hollow cylinder 5 is provided with an inlet groove 1, a multi-turn threaded groove 2 and an outlet groove 3, and a central cavity 4 is formed inside the hollow cylinder 5 that penetrates both end faces of the cylinder.

[0064] The inlet groove 1 is the entry point for the detonating cord, through which the detonating cord enters the surface of the hollow cylinder 5 and begins to wind around.

[0065] The threaded groove 2 is the main storage part for the detonating cord. Its width, depth and adjacent spacing can be adapted to the specifications of the detonating cord, and the number of turns can be adjusted according to the length requirements of the detonating cord.

[0066] The outlet groove 3 is the lead-out part of the detonating cord, from which the detonating cord is led out of the surface of the hollow cylinder 5;

[0067] The central cavity 4 is located in the middle of the hollow cylinder 5 and is used to reduce the weight of the explosion-proof component. At the same time, it works with polyurethane porous material to achieve a synergy between lightweight and explosion-proof performance.

[0068] The hollow cylinder 5 is made of polyurethane material, which has a porous structure and does not react with copper, iron, aluminum, or silver. It is manufactured through a foaming molding process, and its size can be flexibly adapted by adjusting the mold cavity structure.

[0069] Working principle: The detonating cord enters the surface of the hollow cylinder 5 through the inlet groove 1 and is wound in an orderly manner within the multi-turn threaded groove 2. By increasing the effective storage length of the detonating cord and combining the stable detonation velocity characteristics of the detonating cord itself, the precise delayed detonation of the multi-stage charge of the tandem warhead is achieved; the outlet groove 3 pulls the detonating cord out, completing the orderly planning of the detonation path and avoiding the detonating cord from getting tangled or displaced in a confined space;

[0070] The hollow cylinder 5 is made of polyurethane porous material. Its porous structure can effectively absorb the shock wave and heat generated by the detonating cord explosion, achieving explosion-proof and heat-insulating effects. At the same time, the design of the central cavity 4 inside the hollow cylinder 5 is combined with the lightweight properties of polyurethane, which greatly reduces the weight of the explosion-proof component and meets the requirements of lightweight ammunition.

[0071] Polyurethane materials do not chemically react with copper, iron, aluminum, and silver metal components, ensuring the stability of explosion-proof components in complex ammunition assembly environments and avoiding the impact of chemical reactions on the reliability and safety of detonation transmission.

[0072] By adjusting the mold cavity structure, the specifications of the threaded groove 2 and the size of the hollow cylinder 5 can be flexibly changed to adapt to different detonating cord specifications and application scenarios. During assembly, epoxy resin is applied to the surface of the detonating cord inside the threaded groove 2 to achieve a firm connection between the detonating cord and the explosion-proof component, further enhancing structural stability and explosion-proof performance.

[0073] In summary, the explosion-proof component of this technical solution, through the layout of multiple threaded grooves 2, cable inlet groove 1, and cable outlet groove 3 on the surface of the hollow cylinder 5, can orderly store and wind the detonating cord, avoiding the difficulty in planning the wiring path in a confined space due to the excessive length of the detonating cord. At the same time, combined with the structural design of the hollow cylinder 5 and the characteristics of polyurethane porous material, it can effectively absorb the shock wave generated by the explosion of the detonating cord, achieving reliable explosion-proof in a compact volume and meeting the usage requirements in confined spaces.

[0074] This technical solution uses polyurethane material to prepare the hollow cylinder 5. This material itself has lightweight properties, and the porous structure formed by foaming further reduces the weight of the explosion-proof component. At the same time, the design of the central cavity 4 inside the hollow cylinder 5 further reduces the amount of material used, thus achieving weight reduction. Moreover, the porous structure of polyurethane can enhance the heat insulation and explosion-proof effect. Its property of not reacting with copper, iron, aluminum, and silver ensures the stability of the explosion-proof component when assembled with surrounding metal parts. Meanwhile, the lightweight design is conducive to the overall weight reduction and improved portability of the equipment.

[0075] This technical solution adopts a foam molding process, which is simple and easy to operate. By modularly adjusting the mold cavity structure, the width, depth, and spacing of the threaded groove 2 and the diameter and height of the hollow cylinder 5 can be flexibly changed. It can quickly adapt to different detonating cord specifications and various application scenarios without re-molding, which saves production time and costs and improves the versatility and adaptability of explosion-proof components.

[0076] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A small and light detonating cord explosion-proof assembly method of a detonating cord explosion-proof device, characterized by: It comprises the following steps: S1: sizing: according to the demand of target use scene, the diameter and height of hollow cylinder (5), the aperture of middle cavity (4), and the width, depth and pitch of thread groove (2) are determined; S2: raw material preparation and pretreatment: select polyol, isocyanate, blowing agent, catalyst, flame retardant and plasticizer, and carry out dehydration treatment on polyol, control the temperature of raw materials to the preset range; the polyol is polyether polyol or polyester polyol, the catalyst includes amine catalyst and tin catalyst, and the blowing agent includes chemical blowing agent or physical blowing agent; S3: mold preparation: select aluminum alloy mold, steel mold or silica gel mold, process or adjust the mold cavity according to the size determined in S1, so that the inner wall profile, groove structure and hollow channel of the cavity are accurately matched with the target size of the outer wall of hollow cylinder (5), entry groove (1), thread groove (2), exit groove (3) and middle cavity (4) respectively; after cleaning the surface of the mold, apply silicone or polytetrafluoroethylene release agent, and preheat the mold; S4: raw material mixing and pouring: measure each raw material according to the preset proportion, mix the raw materials by high-pressure foaming machine, quickly pour the raw materials into the mold cavity after mixing, and reserve the foaming allowance; S5: foaming and solidification: the raw materials undergo polymerization and foaming process in the mold, the mold temperature is maintained to make the polymer chain fully crosslink and solidify, and the mold is demolded after solidification; S6: aging treatment: place the demolded product in a normal temperature environment or an oven for 24-48 hours, then remove the flash and burr of the product, and carry out cutting, drilling or surface coating processing to obtain the finished product of explosion-proof piece meeting the target size; S7: explosion-proof piece cleaning: wipe the surface of hollow cylinder (5) and the inside of thread groove (2) with anhydrous ethanol to remove dirt and dust, and place it until the anhydrous ethanol is completely volatilized and the explosion-proof piece is dried; S8: deterring explosive winding: winding the deterring explosive along the thread groove (2), so that the deterring explosive is closely attached to the bottom of the thread groove (2), and temporarily fixing the deterring explosive at the entry groove (1) and the exit groove (3) by removable fixing method; S9: colloid coating: select the completed epoxy resin glue, apply it on one side of the surface of hollow cylinder (5), and use a single-blade to scrape evenly along the cylindrical surface, so that the epoxy resin glue completely covers the contact part of the deterring explosive and the thread groove (2) and evenly fills into the thread groove (2), and then use a single-blade to scrape off the excess epoxy resin glue on the surface of hollow cylinder (5); S10: standing solidification: place the explosion-proof piece coated with epoxy resin glue on a flat platform, keep it undisturbed in a normal temperature environment, and let the colloid solidify completely; S11: remove the fixing and check: after the colloid solidifies, remove the temporary fixing structure at the entry groove (1) and the exit groove (3), observe the fixing state of the deterring explosive, and complete the assembly of the deterring explosive on the explosion-proof piece; The small and light deterring explosive includes a hollow cylinder (5), the surface of the hollow cylinder (5) is provided with an entry groove (1), a thread groove (2) and an exit groove (3), and the entry groove (1), the thread groove (2) and the exit groove (3) are communicated. The hollow cylinder (5) is internally formed with a middle cavity (4) penetrating through the two end faces thereof; The entry groove (1) is the entry position of the detonating cord, the exit groove (3) is the exit position of the detonating cord, and the thread groove (2) is used for accommodating the detonating cord.

2. The detonating cord assembling method of the small-sized and light-weighted detonating cord explosion isolation member according to claim 1, characterized in that: The preparation material of the hollow cylinder (5) is polyurethane.

3. The detonating cord assembling method of the small-sized and light-weighted detonating cord explosion isolation member according to claim 2, characterized in that: The polyurethane is of a porous structure and does not react with copper, iron, aluminum and silver.

4. The detonating cord assembling method of the small-sized and light-weighted detonating cord explosion isolation member according to claim 1, characterized in that: The width, depth and adjacent interval of the thread groove (2), and the diameter, height and aperture of the middle cavity (4) of the hollow cylinder (5) are realized by adjusting the structure of the mold cavity, wherein the width, depth and adjacent interval of the thread groove (2) are adapted to the specification of the detonating cord, and the diameter, height and aperture of the middle cavity (4) of the hollow cylinder (5) are matched with the requirements of the use scene.

5. The detonating cord assembling method of the small-sized and light-weighted detonating cord explosion isolation member according to claim 1, characterized in that: In the raw material preparation and pretreatment process, the moisture content of the polyol is controlled to be ≤0.2%, and the raw material temperature is controlled to be 20-30°C; the mold preheating temperature is controlled to be 30-50°C.

6. The detonating cord assembling method of the small-sized and light-weighted detonating cord explosion isolation member according to claim 1, characterized in that: The ratio of the amine catalyst and the tin catalyst is adjusted according to the balance requirement of the foaming reaction and the gel reaction; the working pressure of the high-pressure foaming machine is 10-20MPa, and the mixing time is <0.5s.

7. The detonating cord assembling method of the small-sized and light-weighted detonating cord explosion isolation member according to claim 1, characterized in that: In the foaming and solidification process, the temperature in the mold is maintained at 40-60°C, and the solidification time is adjusted according to the wall thickness of the hollow cylinder (5); the oven curing temperature is controlled to be 60-80°C.

8. The detonating cord assembling method of the small-sized and light-weighted detonating cord explosion isolation member according to claim 1, characterized in that: The foaming allowance reserved by the pouring amount is 10%-20%; after the epoxy resin glue is coated, the standing and curing time of the explosion-proof part is ≥24 hours.

9. The detonating cord assembling method of the small-sized and light-weighted detonating cord explosion isolation member according to claim 1, characterized in that: The removable fixing mode is binding fixation or clamp clamping fixation.

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