A device for measuring the laminar burning velocity of an explosive in a closed space

Abstract

The application discloses a device for measuring the laminar burning velocity of explosives in a closed space, which comprises an explosive piece, a target line, a flame retardant, a fixing ring, a connecting post and a signal transmission line, the explosive piece is formed by stacking multiple explosive columns or tablets, the target line is arranged between every two explosive columns, the two ends of the target line are connected with the connecting posts respectively, the connecting posts are fixed on the grooves of the fixing ring, the signal transmission line is connected with the connecting posts, and the flame retardant is filled between the explosive piece and the fixing ring. The device can not only keep the explosives burning in a cross-section laminar mode, but also can not make the target line melt in advance, and the burning velocity of the explosives in different pressure ranges can be obtained at one time, so that the test cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of explosive burning rate measurement, and particularly relates to a device for measuring laminar burning rate of explosive in a closed space. BACKGROUND

[0002] The relationship between explosive burning rate and pressure is an important parameter for evaluating the safety performance of the explosive, and is also an important index that needs to be controlled in the safety design and regulation of explosive formula. When measuring the burning rate of explosive, very high pressure and temperature appear in the closed space, and the burning process lasts for a long time. If the explosive piece is not handled properly, the burning surface may spread to the side of the explosive piece, and the target line may be melted and broken in advance, so that the burning rate of the explosive cannot be obtained. Therefore, there is an urgent need to invent a device for measuring laminar burning rate of explosive in a closed space to realize the measurement of the burning rate of explosive.

[0003] The target line method of traditional test burning rate is mainly used for measuring the burning rate of propellant under working pressure. Its main principle is that a certain cross section and length of a drug strip is coated on the side to punch a hole at a specified position to install a target line, and the burning rate of the propellant is calculated according to the time measured by the two target lines, as shown in the following formula: Figure 3 It has the following disadvantages and deficiencies: only a single pressure burning rate can be obtained in one test, and the efficiency is low. The tester is a closed space and the volume is large, the pressure is kept constant during the test process, and the applicable pressure is low. The side fire retardant effect is poor at high pressure, and the material cannot guarantee laminar combustion along the length direction. When the temperature inside the tester is high, the target line exposed outside the material is easy to be melted and broken, and the measured burning rate is easy to deviate. SUMMARY

[0004] The purpose of the present application is to provide a device for measuring laminar burning rate of explosive in a closed space to realize the measurement of the burning rate of explosive. The device not only can keep the explosive burning in a cross-sectional laminar manner, but also the target line will not be melted and broken in advance, and the burning rate of explosive in different pressure ranges can be obtained at one time, reducing the test cost.

[0005] In order to achieve the above technical effects, the present application adopts the following technical scheme:

[0006] A device for measuring laminar burning rate of explosive in a closed space, comprising an explosive piece, a target line, a fire retardant, a fixing ring, a terminal post and a signal transmission line, the explosive piece is composed of multiple drug columns or drug pieces, the target line is arranged between every two drug columns or drug pieces, the two ends of the target line are connected with the terminal post, the terminal post is fixed on the groove of the fixing ring, the signal transmission line is connected with the terminal post, and the fire retardant is filled between the explosive piece and the fixing ring.

[0007] Further technical solutions are that the cross-sectional shape of the explosive piece is not limited, and a typical cross-sectional shape is circular or square.

[0008] Further technical solutions are that the end surface of the propellant grain is a plane or an arc surface, and the thickness of the propellant grain is kept consistent.

[0009] Further technical solutions are that the target wire is a metal wire with a height of not more than 100 μm, and the cross-sectional shape is not limited, and a typical cross-sectional shape is circular or elliptical.

[0010] Further technical solutions are that the target wire material is a low-melting-point metal, and a typical material is silver or aluminum.

[0011] Further technical solutions are that the fixing ring is an electrically insulating material.

[0012] Further technical solutions are that the signal transmission line is a high-melting-point metal material such as tungsten, molybdenum or palladium.

[0013] Further technical solutions are that the flame retardant is an electrically insulating flame-retardant material, and a typical material is epoxy resin glue.

[0014] The flame retardant of the present application can be skeletonized at room temperature and high temperature, and the fixing ring can resist the pressure from the periphery to ensure the structural integrity of the explosive sample. The structure realizes the separation of the target wire and the test signal line, the target wire is completely packaged inside the structure, the contact between the target wire and the high-temperature combustion product during the test is avoided, the problem that the target wire is melted and broken in advance is solved, the thickness of the flame retardant is adjusted through the gap size between the sample side and the fixing ring, the consistency and adjustability of the sample flame retardant thickness are ensured, the fixing ring is constrained, the flame retardant strength of the sample side is enhanced, the sample is ensured to burn in the form of cross-sectional laminar flow, and the flame retardant effect under high pressure is improved.

[0015] Compared with the prior art, the present application has the following beneficial effects: the present application realizes the measurement of the laminar flow combustion speed of the explosive piece under high temperature and high pressure; the present application has no limitation on the cross-sectional shape of the tested sample, and has good universality; the present application realizes the separation of signal testing and transmission, avoids the melting and breaking of the target wire in advance, and improves the applicability of the structure in the high-temperature environment. The thickness and constraint strength of the flame retardant of the present application are adjustable, and the flame retardant effect of the sample side under high pressure is improved. In addition, the device has been used in scientific research and production, and through test testing, ordered and stable combustion signals are obtained, the problem of laminar flow combustion speed testing of explosives under high temperature and high pressure is solved, the laminar flow combustion speed of explosives in different pressure ranges is obtained in one test, the test efficiency is improved, manpower and material resources are saved, and the test cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the measuring device of the present application.

[0017] Figure 2 This is a top view of the measuring device of the present invention;

[0018] Figure 3 This is a schematic diagram of the traditional target line testing principle.

[0019] in, Figure 1 and Figure 2 In the middle, 1-Explosive component; 2-Target wire; 3-Flame retardant; 4-Fixing ring; 5-Terminal; 6-Signal transmission line;

[0020] Figure 3 In the middle, 1-ignition wire hole; 2-first target wire hole; 3-second target wire hole. Detailed Implementation

[0021] The present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] like Figure 1 and Figure 2 As shown, this invention provides a structure for measuring the laminar combustion rate of explosives in a confined space. This structure mainly consists of an explosive component 1, a target wire 2, a flame retardant 3, a fixing ring 4, terminals 5, and a signal transmission line 6. The explosive component 1 has a circular or square cross-section, the target wire 2 is a low-melting-point metal wire with a height not exceeding 100 μm (the melting point should be as low as possible while still being higher than the melting point of the sample material, such as silver or aluminum wire), the fixing ring 4 is made of an electrically insulating material (plastic, ceramic, etc.), and the signal transmission line 6 is a high-temperature resistant wire. The explosive component 1 is composed of multiple stacked explosive segments / tablets. The end faces of the explosive segments / tablets can be flat or curved. The target wire 2 is installed between every two segments, and both ends of the target wire 2 are connected to terminals 5. The terminals 5 are installed in the grooves of the fixing ring 4 and connected to the signal transmission line 6. The space between the explosive component 1 and the fixing ring 4 is filled with a liquid flame retardant (which can cure at room temperature and high temperature). Simultaneously, the fixing ring 4 can withstand external pressure, ensuring the structural integrity of the explosive sample. This structure separates the target line from the test signal line, with the entire target line encapsulated inside the structure. This prevents the target line from contacting high-temperature combustion products during testing, solving the problem of the target line being prematurely melted. At the same time, the thickness of the flame retardant can be adjusted by the gap between the sample side and the fixing ring, ensuring the consistency and adjustability of the flame retardant thickness in the sample. In addition, the constraint of the fixing ring enhances the flame retardant strength of the sample side, ensuring that the sample burns in a cross-sectional laminar flow manner, thus improving the flame retardant effect under high pressure.

[0024] Although the present application has been described with reference to the explanatory embodiments thereof, the above embodiments are merely the preferred embodiments of the present application, and the embodiments of the present application are not limited to the above embodiments, and it should be understood that many other modifications and embodiments can be devised by those skilled in the art, and such modifications and embodiments will fall within the scope and spirit of the principles disclosed in the present application.

Claims

1. A device for measuring the laminar combustion rate of explosives in a confined space, characterized in that, The device includes an explosive component, a target wire, a flame retardant, a retaining ring, terminals, and a signal transmission line. The explosive component is composed of multiple stacked explosive segments or tablets, with a target wire positioned between every two segments. The two ends of the target wire are connected to terminals. The target wire is a low-melting-point metal wire with a height not exceeding 100 μm. The terminals are fixed to the grooves of the retaining ring, and the signal transmission line is connected to the terminals. The flame retardant is filled between the explosive component and the retaining ring and is a liquid flame retardant that can be cured at room temperature and high temperature.

2. The apparatus for measuring the laminar combustion rate of explosives in a confined space according to claim 1, characterized in that, The end face of the drug column or tablet is either flat or curved, and the thickness of each drug column / tablet segment remains consistent.

3. The apparatus for measuring the laminar combustion rate of explosives in a confined space according to claim 1, characterized in that, The retaining ring is made of an electrically insulating material.

4. The apparatus for measuring the laminar combustion rate of explosives in a confined space according to claim 1, characterized in that, The signal transmission line is made of high-melting-point metal materials such as tungsten, molybdenum, or palladium.

5. The apparatus for measuring the laminar combustion rate of explosives in a confined space according to claim 1, characterized in that, The flame retardant is an electrically insulating flame-retardant material.

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