Explosive impact ignition reaction test device

Abstract

The invention relates to the technical field of explosive impact ignition tests, in particular to an explosive impact ignition reaction test device. The explosive impact ignition reaction test device comprises a gas gun, an incident rod, an impact part and a detection cutting board which are sequentially arranged along a straight line, the impact part comprises an impact cylinder, the impact cylinder is of a cylinder structure with one end open and the other end closed, and the end of the incident rod is inserted into the impact cylinder in a sliding mode; a filling cavity used for filling explosives is formed between the detection cutting board and the bottom of the impact cylinder, and a restraining part used for restraining axial impact of the impact cylinder during explosion is installed on the detection cutting board. After the incident bar collides with the explosive, the explosive is ignited, and the impact cylinder does not have an assembly gap, so that part of impact force is prevented from being released from the assembly gap, the generated impact force is prevented from acting on the impact cylinder body, and the accuracy of pressure detection data of the cutting board can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of explosive impact ignition test, in particular to an explosive impact ignition reaction test device. Background Art

[0002] Polymer bonded explosive (PBX) has good mechanical properties and high-energy, low-sensitivity detonation performance, and is widely used in domestic and foreign weapon systems. During production, storage, and transportation, PBX explosives may explode due to external environmental impact, causing major safety accidents. Therefore, it is necessary to study the impact ignition reaction behavior of PBX explosives through a test device.

[0003] The Chinese invention patent application document with application publication number CN117471063A discloses an explosive impact shear sensitivity tester with controllable temperature and loading pulse width. The device includes a main loading part and a charge sample compartment part. The main loading part includes an air gun and an incident rod. The air gun fires a bullet rod to make the bullet rod hit the incident rod, and the incident rod hits the explosive sample to simulate the impact load; the charge sample compartment part includes an anvil, a sleeve and a striking column (equivalent to an impact component). The anvil is fixed on a frame, a groove is provided on the anvil, the sleeve is assembled in the groove, an inner cavity penetrating along its axial direction is provided at the center of the sleeve, a striking column is provided at the bottom of the sleeve, the striking column is assembled in the inner cavity to block one end of the inner cavity, one end of the incident rod is slidably inserted in the inner cavity of the sleeve, the striking column, the inner cavity wall of the sleeve and the incident rod together form an explosive compartment, the explosive sample is placed in the explosive compartment, and a PVDF film piezoelectric sensor is provided in the groove of the anvil below the striking column. When the existing test device conducts an explosive impact ignition simulation test, the explosive ignites after the incident rod hits the explosive sample. Since the striking column is assembled in the inner cavity of the sleeve, the striking column, the inner cavity wall of the sleeve and the incident rod together form an explosive chamber. Therefore, part of the impact force generated by the explosion of the explosive will be released from the assembly gap between the striking column and the sleeve, resulting in inaccurate pressure detection data. Summary of the invention

[0004] The purpose of the present invention is to provide an explosive impact ignition reaction test device to solve the problem of inaccurate pressure detection in existing test devices.

[0005] To achieve the above object, the present invention adopts the following technical solution: The explosive impact ignition reaction test device comprises an air gun, an incident rod, an impact component and a detection anvil arranged in sequence along a straight line, wherein the impact component comprises an impact tube, which is a cylindrical structure with an open end and a closed end, wherein the end of the incident rod is slidably inserted in the impact tube, and a filling cavity for filling explosives is formed between the end of the incident rod and the bottom of the impact tube, and a restraining component for restraining the axial impact of the impact tube during explosion is installed on the detection anvil.

[0006] The wall of the impact tube has a transparent portion at least at a position corresponding to the filling cavity. The explosive impact ignition reaction test device also includes an observation component, which includes a high-speed camera for recording the ignition situation of the filling cavity.

[0007] The impact tube has the transparent part on the walls on the opposite sides corresponding to the filling cavity. The observation component includes a light source arranged on one side of the impact tube corresponding to the transparent part, and a reflector arranged on the other side of the impact tube corresponding to the transparent part. The reflector is used to vertically reflect the light emitted by the light source and passing through the impact tube to the high-speed camera.

[0008] A scintillator is arranged on the optical path between the reflector and the impact tube.

[0009] The light source includes an X-ray source and a calibrator.

[0010] The impact cylinder is a plexiglass cylinder.

[0011] The restraining component is a restraining hoop, which includes two hoop rings with two ends fixedly connected by bolt assemblies. The two hoop rings are respectively provided with axially penetrating fixed through holes for fixed installation on the detection anvil. The pressure sensor of the detection anvil corresponds to the middle position of the restraining hoop.

[0012] The explosive impact ignition reaction test device also includes a pair of strain gauges, which are symmetrically attached to both sides of the incident rod. The strain gauges are connected to an oscilloscope, and a pressure sensor for detecting anvil plates is connected to the oscilloscope.

[0013] The strain gauges are connected to the oscilloscope via a Wheatstone bridge and a dynamic strain gauge.

[0014] A shaper is arranged at one end of the incident rod facing the gas gun.

[0015] Beneficial effects: The present invention is an improved invention. The impact tube is a cylindrical structure with one end open and the other end closed. The incident rod is slidably inserted in the impact tube and forms a filling cavity for filling explosives between the incident rod and the bottom of the impact tube. After the incident rod hits the explosive, the explosive ignites. Since there is no assembly gap in the impact tube, part of the impact force is avoided from being released from the assembly gap. The generated impact force acts on the impact tube body, thereby improving the accuracy of the pressure detection data of the detection anvil. A constraint component is installed on the detection anvil to constrain the impact tube to only impact in the axial direction, thereby ensuring that the pressure sensor of the detection anvil can accurately detect the impact force. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an overall schematic diagram of the explosive impact ignition reaction test device of the present invention; Figure 2A schematic diagram showing a restraining hoop installed on a detection chopping board; In the figure: 1. gas gun; 2. shaper; 3. incident rod; 4. impact tube; 5. reflector; 6. high-speed camera; 7. scintillator; 8. restraint hoop; 9. detection anvil; 10. pressure sensor; 11. calibrator; 12. X-ray source; 13. explosive; 14. strain gauge; 15. laser velocimeter; 16. bullet rod; 17. bolt assembly; 18. hoop; 19. fixed through hole; 20. Wheatstone bridge; 21. dynamic strain gauge; 22. oscilloscope; 23. circuit board. DETAILED DESCRIPTION

[0017] The present invention is mainly used to solve the problem that the impact force generated by the explosion of explosives in the existing test device is partially released from the assembly gap between the impact column and the sleeve, resulting in inaccurate pressure detection data. The basic inventive concept of the present invention is to design the impact cylinder as a cylinder structure with one end open and the other end closed, so as to avoid the existence of an assembly gap in the impact component, thereby avoiding the release of part of the impact force from the assembly gap and improving the accuracy of the pressure detection data.

[0018] Based on the above inventive concept, embodiments of the present invention are described in detail below.

[0019] like Figure 1 As shown, the explosive impact ignition reaction test device of the present invention comprises an air gun 1, an incident rod 3, an impact component and a detection anvil 9 arranged in sequence along a straight line. The air gun 1 fires a bullet rod 16 at a certain speed. The bullet rod 16 is coaxially arranged with the incident rod 3. The bullet rod 16 hits the incident rod 3 to form a compression stress wave. A shaper 2 is provided at one end of the incident rod 3 facing the air gun 1. The explosive 13 is placed in the filling cavity of the impact component. The incident rod 3 impacts the explosive 13, triggering the explosive 13 to produce an ignition reaction. The impact component comprises an impact cylinder 4, which is a cylinder structure with one end open and the other end closed. The end of the incident rod 3 is slidably inserted in the inner cavity of the impact cylinder 4, and a filling cavity for filling the explosive 13 is formed between the end of the incident rod 3 and the bottom of the impact cylinder 4. A constraint component is installed on the detection anvil 9. The constraint component is a constraint clamp 8, which is used to constrain the impact cylinder 4 to only impact along the axial direction during the explosion. The detection anvil 9 includes an anvil and a pressure sensor 10 installed at the center of the anvil. The pressure sensor 10 is a PVDF film pressure sensor, which is attached to the anvil. The sensitive center of the PVDF film pressure sensor is concentric with the anvil. The sensitive center of the PVDF film pressure sensor is also concentric with the impact cylinder 4.

[0020] The explosive impact ignition reaction test device also includes an observation component, which is used to observe and record the impact ignition reaction process of the explosive 13. The observation component includes a light source, a reflector 5, a scintillator 7 and a high-speed camera 6. The impact tube 4 is a plexiglass cylinder, which is transparent as a whole and meets the light transmission condition. The light source and the reflector 5 are respectively arranged on the opposite sides of the impact tube 4. The light source includes an X-ray source 12 and a calibrator 11. The X-ray source 12 is aimed at the impact tube 4. The calibrator 11 is added between the X-ray source 12 and the impact tube 4. The reflector 5 is used to vertically reflect the light emitted by the light source through the impact tube 4 to the high-speed camera 6. The high-speed camera 6 is used to record the ignition situation in the filling cavity. The high-speed camera 6 can be set at a position far away from the impact tube 4, which is convenient for arrangement and conducive to ensuring a high recording clarity. A scintillator 7 is provided on the optical path between the reflector 5 and the impact tube 4.

[0021] Two strain gauges 14 are arranged on the surface of the incident rod 3, and the two strain gauges 14 are symmetrically attached to the two sides of the incident rod 3 and placed on the same cross section of the incident rod 3. The leads of the strain gauges 14 are welded on the pins of the strain gauges 14, and the leads of the strain gauges 14 are connected to the Wheatstone bridge 20 using a double-core shielded wire. The output signal of the Wheatstone bridge 20 is connected to the input end of the dynamic strain gauge 21, and the dynamic strain gauge 21 is connected to the oscilloscope 22, and the stress wave size in the incident rod 3 is obtained through the strain gauges 14. The pressure sensor 10 for detecting the anvil 9 is connected to the oscilloscope 22 through the circuit board 23.

[0022] A laser speed meter 15 is provided on one side of the gas gun 1 at a position corresponding to the gap between the gas gun 1 and the incident rod 3 , for detecting the firing speed of the bullet rod 16 .

[0023] A restraining hoop 8 is installed on the detection anvil 9 to restrain the impact tube 4 from impacting in the axial direction during the explosion. Figure 2 As shown, the constraint hoop 8 includes two-petal hoop rings 18, the two ends of the two-petal hoop rings 18 are fixedly connected by bolt assemblies 17, and the two-petal hoop rings 18 are respectively provided with axially penetrating fixing through holes 19, and the detection anvil 9 is correspondingly provided with mounting holes. The constraint hoop 8 is fixedly installed on the detection anvil 9 by multiple groups of bolt assemblies 17, and the pressure sensor 10 of the detection anvil 9 corresponds to the middle position of the constraint hoop 8. The constraint component adopts the constraint hoop 8, firstly, the structure is simple and the assembly is convenient, and secondly, the spacing between the two-petal hoop rings 18 of the hoop can be adjusted within a small range, so that it can better adapt to the outer diameter of the impact tube 4, and provide more reliable axial impact constraint to the impact tube 4.

[0024] During the test of the explosive impact ignition reaction test device, stress waves of different amplitudes and pulse widths can be obtained by adjusting the pressure of the gas gun 1 and the length and shape of the bullet rod 16, and the impact load that generates the stress wave can be adjusted to obtain a low-amplitude, long-pulse impact load that is consistent with the actual situation. Since there is no assembly gap in the impact cylinder 4, it avoids the release of part of the impact force from the assembly gap after the explosion of the explosive 13, thereby improving the accuracy of the pressure detection data. The observation component can effectively record the impact ignition reaction process of the explosive 13.

[0025] Of course, the present invention is not limited to the implementation methods in the above embodiments.

[0026] For example, in other embodiments, the impact tube may not be a completely transparent glass tube structure, but may only have transparent parts on the tube wall at two opposite sides corresponding to the filling cavity, and the light source and the reflector are respectively arranged at two opposite sides of the impact tube and corresponding to the transparent parts. Alternatively, the wall of the impact tube may only have transparent parts at positions corresponding to the filling cavity, and one, two or more high-speed cameras may be arranged around the filling cavity for recording.

[0027] For example, in other implementations, the light source may not be equipped with a calibrator.

[0028] For example, in other embodiments, the restraint component may also be an annular restraint sleeve fixedly mounted on the detection anvil, the inner diameter of the annular restraint sleeve is slightly larger than the outer diameter of the impact tube, and the pressure sensor of the detection anvil corresponds to the center position of the annular restraint sleeve.

[0029] For example, in other implementations, the strain gauge is connected to the oscilloscope via an acquisition card.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. An explosive impact ignition reaction test device, comprising an air gun, an incident rod, an impact component and a detection anvil arranged in sequence along a straight line, characterized in that: The impact component includes an impact tube, which is a cylindrical structure with one end open and the other end closed. The end of the incident rod is slidably inserted in the impact tube, and a filling cavity for filling explosives is formed between the end of the incident rod and the bottom of the impact tube. A restraining component for restraining the axial impact of the impact tube during explosion is installed on the detection anvil.

2. The explosive impact ignition reaction test device according to claim 1, characterized in that: The wall of the impact tube has a transparent portion at least at a position corresponding to the filling cavity. The explosive impact ignition reaction test device also includes an observation component, which includes a high-speed camera for recording the ignition situation of the filling cavity.

3. The explosive impact ignition reaction test device according to claim 2, characterized in that: The impact tube has the transparent part on the walls on the opposite sides corresponding to the filling cavity. The observation component includes a light source arranged on one side of the impact tube corresponding to the transparent part, and a reflector arranged on the other side of the impact tube corresponding to the transparent part. The reflector is used to vertically reflect the light emitted by the light source and passing through the impact tube to the high-speed camera.

4. The explosive impact ignition reaction test device according to claim 3 is characterized in that: A scintillator is arranged on the optical path between the reflector and the impact tube.

5. The explosive impact ignition reaction test device according to claim 3 is characterized in that: The light source includes an X-ray source and a calibrator.

6. The explosive impact ignition reaction test device according to any one of claims 2 to 5, characterized in that: The impact cylinder is a plexiglass cylinder.

7. The explosive impact ignition reaction test device according to any one of claims 1 to 5, characterized in that: The restraining component is a restraining hoop, which includes two hoop rings with two ends fixedly connected by bolt assemblies. The two hoop rings are respectively provided with axially penetrating fixed through holes for fixed installation on the detection anvil. The pressure sensor of the detection anvil corresponds to the middle position of the restraining hoop.

8. The explosive impact ignition reaction test device according to any one of claims 1 to 5, characterized in that: The explosive impact ignition reaction test device also includes a pair of strain gauges, which are symmetrically attached to both sides of the incident rod. The strain gauges are connected to an oscilloscope, and a pressure sensor for detecting anvil plates is connected to the oscilloscope.

9. The explosive impact ignition reaction test device according to claim 8, characterized in that: The strain gauges are connected to the oscilloscope via a Wheatstone bridge and a dynamic strain gauge.

10. The explosive impact ignition reaction test device according to any one of claims 1 to 5, characterized in that: A shaper is arranged at one end of the incident rod facing the gas gun.

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