Detonating cord

Abstract

The utility model provides a detonating cord. The detonating cord comprises a core wire, a flux core, a flux wrapping film, an inner aramid fiber thread layer, a middle aramid fiber thread layer, a damp-proof asphalt layer, a wrapping film, a paper strip, an outer cotton thread layer and a coating which are arranged from inside to outside. Wherein the inner-layer aramid fiber wire layer and the outer-layer aramid fiber wire layer are wound on the outer portion of the medicine wrapping film in a left-right staggered and coiled mode, and the outer portion of the outer-layer aramid fiber layer is coated with the damp-proof asphalt layer. The cable has the characteristics of high structural strength, high temperature resistance, low temperature resistance, water resistance and moisture resistance.

Description

Technical Field

[0001] The present application belongs to the technical field of pyrotechnics, and specifically relates to a detonating cord. Background Art

[0002] According to GB / 9786-2015 Industrial Detonating Cord 5.4.4 Heat Resistance Industrial detonating cord shall be kept at 72℃±2℃ for 2h. The detonating cord shall not spontaneously combust or explode, the surface shall not crack, and it shall detonate completely after detonation. 5.4.5 Cold Resistance Industrial detonating cord shall be kept at -40℃±2℃ for 2h. The detonating cord shall not spread explosives or leak inner wires, the coating shall not crack, and it shall detonate completely after detonation. 5.4.6 Tensile Resistance Industrial detonating cord shall withstand a static tensile force of not less than 400N for 30min. After testing according to the provisions of GB / T 13224, it shall not break and it shall detonate completely after detonation.

[0003] In related technologies, for example, Chinese invention patent CN100378041C discloses a 180°C / 48h high-temperature resistant detonating cord technology, which includes a main explosive and a coating material. However, the detonating cord described in this solution has low overall strength, is not resistant to stretching and bending, is not effectively moisture-proof, and does not mention low-temperature resistance and tensile strength. Utility Model Content

[0004] The present application aims to provide a detonating cord with high structural strength, high temperature resistance, low temperature resistance, water resistance, and moisture resistance. To this end, the present application adopts the following technical solutions:

[0005] A detonating cord comprises a core wire, a powder core, a powder coating, an inner aramid wire layer, a middle aramid wire layer, a moisture-proof asphalt layer, a coating film, a paper strip, an outer cotton wire layer and a coating, which are arranged from the inside to the outside;

[0006] The inner aramid layer and the middle aramid layer are wound around the outside of the drug-coated film in alternating coils, and the moisture-proof asphalt layer is coated on the outside of the middle aramid layer.

[0007] The core wire is a cotton thread and is located at the center of the detonating cord;

[0008] The drug core is located outside the core wire;

[0009] The medicine coating wraps the medicine core.

[0010] Furthermore, the covering film is curled and wrapped around the outside of the moisture-proof asphalt layer.

[0011] Furthermore, the paper strip is curled and wound around the outside of the covering film.

[0012] Furthermore, the outer cotton thread layer is curled and wound around the outside of the paper strip.

[0013] Furthermore, moisture-proof caps are provided at both ends of the detonating cord.

[0014] Beneficial effects of this application:

[0015] The present application is provided with an inner aramid wire layer and a middle aramid wire layer wound in staggered coils on the left and right, which can effectively improve the tensile strength of the detonating cord; a drug film is added outside the core to prevent the heated asphalt from flowing into the core and causing the detonating cord to refuse to explode, so as to improve high temperature resistance; at the same time, when bent at low temperature, the drug film and the coating film prevent the asphalt from scattering to the outside, and a coating layer is provided outside the inner aramid wire layer and the middle aramid wire layer, which can make the aramid wire layer evenly stressed, prevent the aramid wire layer from being scattered when the detonating cord is connected and knotted, and prevent the aramid fiber from being damaged and affecting the strength of the detonating cord; the drug film, the asphalt layer and the coating film form a three-line sealing structure to improve the water resistance and moisture resistance of the detonating cord. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0017] In the figure: 1 core wire, 2 medicine core, 3 medicine film, 4 inner aramid wire layer, 5 covering film, 6 asphalt layer, 7 outer cotton wire layer, 8 coating, 9 moisture-proof cap, 10 paper strip, 11 middle aramid wire layer. DETAILED DESCRIPTION

[0018] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0019] In the description of this application, it should be understood that the terms "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0020] Reference Figure 1 The present application provides a detonating cord, comprising, arranged from inside to outside, a core wire 1, a powder core 2, a powder coating 3, an inner aramid wire layer 4, a middle aramid wire layer 11, a moisture-proof asphalt layer 6, a coating 5, a paper strip 10, an outer cotton wire layer 7, and a coating 8;

[0021] The inner aramid layer 4 and the middle aramid layer are wound around the outside of the drug-wrapped film 3 in alternating coils.

[0022] Specifically, the core 2 can be made of Taian explosive (pentaerythritol tetranitrate) to reduce the critical diameter and improve the detonation sensitivity. The core 2 is attached to the core wire 1, and the core wire 1 can be a cotton thread. The core 2 and the core wire 1 are fixedly coated by the coating 3. Because the surface of the aramid line is smooth and not easy to adhere to Taian, a plastic coating 3 is used to improve the processability. The coating 3 can also prevent asphalt from flowing into the core 2 under high temperature conditions, prevent the explosion refusal phenomenon, and meet the heat resistance; it also improves moisture resistance and water resistance; the inner aramid line layer 4 and the middle aramid line layer are the force-bearing parts of the detonating cord. The inner aramid line layer 4 and the middle aramid line layer 11 are wound in a left-right staggered manner to effectively eliminate internal forces and improve the overall tensile strength of the detonating cord. Aramid fiber is flame retardant and high temperature resistant, meeting the high temperature resistance. Aramid fiber also has cut resistance and is resistant to cutting and shearing. In addition, aramid fiber has a large specific strength, the same diameter as industrial detonating cord and military detonating cord, and the weight per meter is also the same.

[0023] Reference Figure 1 It can be understood that the covering film 5 is curled and wrapped around the outside of the middle aramid wire layer.

[0024] Specifically, the coating film 5 tightly wraps the inner aramid wire layer 4 and the middle aramid wire layer 11 to evenly distribute the force, prevent the aramid wires from becoming scattered when the high-strength detonating cord is connected and knotted, prevent damage to the aramid fibers, protect the asphalt layer 6, and provide moisture and water resistance. The coating film 5 can be made of polyester film.

[0025] The detonating cord of the present application shall meet the requirements of the low-temperature test of GJB797.2-90 Environmental Test Methods for Landmine Explosive Equipment for cold resistance among blasting materials, and the low-temperature storage temperature shall meet the requirements of -50±2°C for 168 hours; the heat resistance shall meet the requirements of the high-temperature test of GJB797.3-90 Environmental Test Methods for Landmine Explosive Equipment for high-temperature storage temperature shall meet the requirements of +70±2°C for 168 hours; its tensile strength shall meet the requirements of not less than 3500N; and it shall also meet the requirements of shooting performance and spray combustion performance; other performances shall be the same as the requirements of medium-energy detonating cord in GB / 9786-2015 Industrial Detonating Cord: charge amount not less than 11g / m, detonation velocity not less than 6500m / s, outer diameter: 5.2~6.0mm and other relevant requirements.

[0026] Reference Figure 1 It can be understood that the paper strip 10 is curled and wrapped around the outside of the covering film 5 .

[0027] Reference Figure 1 It can be understood that the outer cotton thread layer 7 is curled and wrapped around the outside of the paper strip 10.

[0028] Reference Figure 1 It can be understood that moisture-proof caps 9 are provided at both ends of the detonating cord.

[0029] Specifically, the moisture-proof caps 9 are located at both ends of the cable segment and can be made of aluminum or plastic.

[0030] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. A person skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A detonating cord, characterized in that: The device comprises a core wire, a drug core, a drug coating, an inner aramid layer, a middle aramid layer, a moisture-proof asphalt layer, a coating, a paper strip, an outer cotton layer, and a coating, arranged from the inside to the outside; wherein the inner aramid layer and the middle aramid layer are wound around the outside of the drug coating in alternating coils, and the moisture-proof asphalt layer is coated on the outside of the middle aramid layer; The core wire is a cotton thread and is located at the center of the detonating cord; The drug core is located outside the core wire; The medicine coating wraps the medicine core.

2. A detonating cord according to claim 1, characterized in that: The covering film is curled and wrapped around the outside of the moisture-proof asphalt layer.

3. The detonating cord according to claim 1, characterized in that: The paper strip is curled and wound around the outside of the covering film.

4. The detonating cord according to claim 1, characterized in that: The outer cotton thread layer is curled and wound around the outside of the paper strip.

5. A detonating cord according to any one of claims 1 to 4, characterized in that: Moisture-proof caps are provided at both ends of the detonating cord.

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