Explosion testing device for honeycomb plate

Abstract

The invention relates to the field of honeycomb plate manufacturing, and discloses an explosion testing device of a honeycomb plate, which comprises an explosion generation cavity, a fuel gas supply system, an ignition device, a dynamic monitoring device and an impact protection cover. The honeycomb plate is pre-tightened and buffered through the pre-tightening pressing piece, the bolt and the spring. The fuel gas supply system accurately regulates and controls the ratio of fuel gas to air and comprises a vacuum pumping assembly. And the ignition device ensures stable explosion. The dynamic monitoring device comprises a high-speed camera, a strain gauge and a laser displacement sensor and comprehensively captures dynamic response. The impact protection cover provides multiple protection. The device can simulate actual working conditions, guarantees safety, is accurate in monitoring, is convenient to recycle and analyze, and improves the test reliability and comprehensiveness.

Description

Technical Field

[0001] This invention relates to the field of honeycomb panel manufacturing, and in particular to an explosion testing device for honeycomb panels. Background Technology

[0002] Honeycomb panels are widely used in aerospace, construction, and transportation industries due to their lightweight, high strength, and excellent impact resistance. Especially in scenarios where explosive impacts are possible, their blast resistance is a key indicator of product reliability. To ensure the safe use of honeycomb panels under actual working conditions, their blast resistance performance must be evaluated using an explosion testing device to simulate an explosive environment.

[0003] Currently, existing honeycomb panel explosion testing devices have the following problems during use:

[0004] 1. The structural design of some testing devices makes it easy for honeycomb panels to shatter, scatter, or adhere tightly to the device components after an explosion test, making them difficult to recover completely. This, in turn, affects the detailed observation and analysis of their deformation and degree of damage.

[0005] 2. In the event of an explosion, if there is a lack of effective restraint structure, the honeycomb panels may be ejected from the testing device due to the explosive force, which may not only damage surrounding equipment but also pose a safety threat to the operators.

[0006] 3. Existing devices often cannot monitor the dynamic response of honeycomb panels during an explosion, and cannot accurately capture their strain distribution, deformation patterns and failure process. As a result, the evaluation of their explosion resistance performance can only rely on the static results after the test, lacking dynamic data support, and the evaluation conclusions are not comprehensive enough.

[0007] 4. In actual working conditions, honeycomb panels are usually under a certain pre-tightening state (such as pre-tightening force applied by bolts and other connecting parts). However, most existing testing devices do not have a structure that can simulate the pre-tightening force under actual working conditions, or the way the pre-tightening force is applied is unreasonable, which leads to a deviation between the test environment and the actual working conditions, affecting the authenticity and reliability of the test results.

[0008] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0009] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an explosion testing device for honeycomb panels, which aims to solve any of the technical problems existing in the prior art.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] An explosion testing device for a honeycomb panel includes an explosion-generating cavity with a top opening, a gas supply system for evacuating the explosion-generating cavity and providing gas, an ignition device for igniting the combustible gas in the explosion-generating cavity, and a dynamic monitoring device disposed around the explosion-generating cavity. The outer wall of the explosion-generating cavity has at least two side ears, each with a threaded hole. The honeycomb panel to be tested is placed over the opening of the explosion-generating cavity, and the top of the honeycomb panel is pressed down by a pre-tightening member. The pre-tightening member has through holes corresponding to the threaded holes. A bolt is vertically inserted into each through hole of the pre-tightening member, and the tail of the bolt is connected to the corresponding threaded hole. A first spring located above the pre-tightening member and a second spring located below the pre-tightening member are fitted onto the bolt. The top end of the first spring presses against the head of the bolt, and the bottom end presses against the top surface of the pre-tightening member. The top end of the second spring presses against the bottom surface of the pre-tightening member, and the bottom end presses against the side ears. The elastic force of the first spring is greater than that of the second spring.

[0012] As a further improvement to the above technical solution, the explosion generating cavity includes a lower half base and an upper half forming seat that are vertically assembled. The side ear is set on the upper half forming seat. The top of the lower half base is provided with a lower rim, and the upper half forming seat is provided with an upper rim. The upper rim and the lower rim are connected by locking screws and nuts, and a sealing ring is provided between the upper rim and the lower rim. The opening shape of the upper half forming seat is adapted to the shape of the honeycomb panel to be tested.

[0013] As a further improvement to the above technical solution, the honeycomb panel to be tested is rectangular, the upper half of the forming seat is rectangular and has four side ears arranged on the four sides of the upper half of the forming seat respectively; from a top view, the pre-tightening member is cross-shaped.

[0014] As a further improvement to the above technical solution, the gas supply system includes a gas storage tank, a flow regulating valve, a mixer and a gas guide pipe connected in sequence. The output end of the gas guide pipe is connected to the explosion cavity, and a one-way valve is provided on the gas guide pipe. The mixer is provided with an air inlet, and an air flow valve is provided at the air inlet to regulate the mixing ratio of air and gas. A one-way valve is also provided on the gas guide pipe.

[0015] As a further improvement to the above technical solution, the gas supply system also includes a vacuum pumping assembly connected to the explosion cavity; the vacuum pumping assembly includes a vacuum pump and a pumping pipe, one end of the pumping pipe is connected to the explosion cavity, the other end is connected to the vacuum pump, and a control valve is provided on the pumping pipe.

[0016] As a further improvement to the above technical solution, the ignition device includes an ignition electrode that penetrates the side wall of the explosion generating cavity, with the inner end of the ignition electrode extending to the central axis of the explosion generating cavity and the outer end connected to a high-voltage pulse generator.

[0017] As a further improvement to the above technical solution, the dynamic monitoring device includes at least three sets of high-speed cameras, which are evenly distributed around the circumference of the explosion cavity, and the lenses of the cameras are all set towards the honeycomb panel to be tested.

[0018] As a further improvement to the above technical solution, the dynamic monitoring device also includes multiple strain gauges, which are attached to the top surface of the honeycomb panel to be tested and are radially distributed along the center of the honeycomb panel.

[0019] As a further improvement to the above technical solution, the dynamic monitoring device also includes a laser displacement sensor installed on the outer wall of the explosion cavity.

[0020] As a further improvement to the above technical solution, an impact shield is provided around the explosion cavity. The impact shield is a cylindrical structure with an open top, and its inner diameter is larger than the outer diameter of the explosion cavity. It is also coaxially arranged with the explosion cavity. The inner wall of the impact shield is provided with a honeycomb aluminum buffer layer, a polyurethane foam energy-absorbing layer and a steel shell from the inside to the outside. The impact shield is provided with observation windows that correspond one-to-one with the high-speed camera. A transparent protective plate is embedded in the observation window.

[0021] The beneficial effects of the present invention: Compared with the prior art, the explosion testing device for honeycomb panels provided by the present invention has the following advantages:

[0022] 1. By utilizing the force difference between the first and second springs, the pre-tightening component applies a stable pre-tightening force to the honeycomb panel, simulating its stress state under actual working conditions (such as bolted connections), reducing the deviation between the test environment and actual applications, and improving the authenticity and reliability of the test results.

[0023] 2. When the honeycomb panel moves upward, the first spring further compresses and buffers the impact force to avoid rigid impact between the pre-tightening component and the bolt head, thus protecting the device components from damage. When the honeycomb panel falls, the second spring compresses and buffers to reduce the secondary pressure of the pre-tightening component on the honeycomb panel, avoiding confusion of the deformation results of the honeycomb panel due to secondary impact, and ensuring the accuracy of the test data.

[0024] 3. The honeycomb panels move under bolt constraints and will not break, splash, or stick to the device after the test. They can be completely recovered, facilitating detailed observation and analysis of their deformation and degree of damage. At the same time, the non-rigid contact between the pre-tightening components and the device parts avoids additional damage and ensures that the test results only reflect the impact of the explosive force.

[0025] 4. The explosive power can be adjusted through the gas supply system. The data captured by the dynamic monitoring device includes not only the strain distribution and deformation law at the moment of explosion, but also the dynamic response of the honeycomb panel throughout the entire movement process. This provides richer and more accurate dynamic data support for the explosion resistance performance evaluation, making the evaluation conclusions more scientific. Attached Figure Description

[0026] Figure 1 A three-dimensional view of the honeycomb panel being clamped into the explosion cavity.

[0027] Figure 2 Front view of the honeycomb panel being clamped into the explosion cavity.

[0028] Figure 3 This is a three-dimensional view of the explosion testing device.

[0029] Explanation of main component symbols: 1-Explosion generating cavity, 11-Lower half base, 12-Upper half fitting seat, 13-Side ear, 14-Threaded hole, 15-Lower rim, 16-Upper rim, 17-Locking screw, 18-Nut, 2-Gas supply system, 21-Gas duct, 22-Extraction pipe, 3-Ignition device, 41-High-speed camera, 42-Laser displacement sensor, 5-Pre-tightening component, 51-Through hole, 6-Bolt, 71-First spring, 72-Second spring, 8-Impact protective cover, 9-Honeycomb panel. Detailed Implementation

[0030] This invention provides an explosion testing device for honeycomb panels. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the scope of protection of the invention.

[0031] Please see Figures 1 to 3This invention provides an explosion testing device for honeycomb panels, comprising an explosion generating cavity 1 with a top opening, a gas supply system 2 for evacuating the explosion generating cavity 1 and supplying gas, an ignition device 3 for igniting the combustible gas inside the explosion generating cavity 1, and a dynamic monitoring device disposed around the explosion generating cavity 1. The outer wall of the explosion generating cavity 1 is provided with at least two side ears 13, each side ear 13 having a threaded hole 14. The honeycomb panel 9 to be tested is placed over the opening of the explosion generating cavity 1, and the top of the honeycomb panel 9 to be tested is pressed down by a pre-tightening clamp 5. The pressure member 5 is provided with a through hole 51 corresponding to the threaded hole 14. A bolt 6 is vertically inserted into the through hole 51 of each pre-tightening pressure member 5, and the tail of the bolt 6 is connected to the corresponding threaded hole 14. A first spring 71 located above the pre-tightening pressure member 5 and a second spring 72 located below the pre-tightening pressure member 5 are fitted on the bolt 6. The top end of the first spring 71 presses against the head of the bolt 6 and the bottom end presses against the top surface of the pre-tightening pressure member 5. The top end of the second spring 72 presses against the bottom surface of the pre-tightening pressure member 5 and the bottom end presses against the side lug 13. The elastic force of the first spring 71 is greater than that of the second spring 72.

[0032] The working principle is as follows: First, the honeycomb panel 9 to be tested is placed over the opening of the explosion-generating cavity 1 with its top opening, and fixed by the cooperation of the pre-tightening clamp 5 and the bolt 6. After the bolt 6 passes through the through hole 51 of the pre-tightening clamp 5, it connects to the threaded hole 14 on the side lug 13 on the outer side wall of the explosion-generating cavity 1. At this time, the first spring 71 and the second spring 72 on the bolt 6 are both under stress. Because the elastic force of the first spring 71 is greater than that of the second spring 72, it will generate a downward resultant force on the pre-tightening clamp 5, pressing the honeycomb panel 9 tightly against the opening of the explosion-generating cavity 1, simulating the pre-tightened state of the honeycomb panel 9 under actual working conditions.

[0033] Next, the gas supply system 2 first evacuates the explosion chamber 1 to remove air, and then fills it with an appropriate amount of gas. Once the gas concentration reaches the standard, the ignition device 3 ignites the combustible gas in the explosion chamber 1, and the instantaneous explosive force acts on the bottom of the honeycomb panel 9. When the explosive force overcomes the weight of the honeycomb panel 9 and the downward pressure applied by the first spring 71, the honeycomb panel 9 is pushed upward, and the pre-tightening member 5 moves upward synchronously with the honeycomb panel 9.

[0034] During the upward movement of the honeycomb panel 9, the pre-tightening member 5 compresses the first spring 71. The elastic deformation of the first spring 71 generates a counterforce, buffering the upward impact until the movement speed of the honeycomb panel 9 decreases to zero, preventing a rigid impact between the pre-tightening member 5 and the head of the bolt 6. Since the bolt 6 is vertically positioned, it acts as a guide, ensuring that the honeycomb panel 9 moves upward along the axis of the bolt 6, preventing it from deviating and falling along the bolt 6 after reaching its highest point. At this time, the pre-tightening member 5 falls accordingly. The previously compressed second spring 72 gradually extends and recovers. When the honeycomb panel 9 contacts the pre-tightening member 5, the second spring 72 is recompressed, buffering the falling impact through elastic deformation, reducing the secondary pressure of the pre-tightening member 5 on the honeycomb panel 9, and simultaneously reducing the violent rigid collision between the pre-tightening member 5 and the top of the explosion cavity 1. Throughout the entire explosion and the movement of the honeycomb panel 9, the dynamic monitoring device around the explosion cavity 1 captures the dynamic response data of the honeycomb panel 9. After the explosion, the bolt 6 can be loosened and the honeycomb panel 9 removed for subsequent analysis.

[0035] The explosion testing device for the honeycomb panel 9 provided by the present invention has the following advantages:

[0036] 1. By utilizing the force difference between the first spring 71 and the second spring 72, the pre-tightening member 5 applies a stable pre-tightening force to the honeycomb panel 9, simulating its stress state in actual working conditions (such as bolt 6 connection), reducing the deviation between the test environment and actual application, and improving the authenticity and reliability of the test results.

[0037] 2. When the honeycomb panel 9 moves upward, the first spring 71 further compresses and buffers the impact force to avoid rigid impact between the pre-tightening member 5 and the head of the bolt 6, thus protecting the device components from damage. When the honeycomb panel 9 falls, the second spring 72 compresses and buffers to reduce the secondary pressure of the pre-tightening member 5 on the honeycomb panel 9, thus avoiding confusion of the deformation results of the honeycomb panel 9 due to secondary impact and ensuring the accuracy of the test data.

[0038] 3. The honeycomb panel 9 completes its movement under the constraint of bolt 6. After the test, it will not break, splash, or stick to the device. It can be completely recovered, which facilitates detailed observation and analysis of its deformation and degree of damage. At the same time, the non-rigid contact between the pre-tightening clamp 5 and the device components avoids additional damage and ensures that the test results only reflect the influence of the explosive force.

[0039] 4. The explosive power can be adjusted through the gas supply system 2. The data captured by the dynamic monitoring device includes not only the strain distribution and deformation law at the moment of explosion, but also the dynamic response of the honeycomb panel 9 throughout the entire movement process, providing richer and more accurate dynamic data support for the explosion resistance performance evaluation, making the evaluation conclusion more scientific.

[0040] Specifically, the explosion generating chamber 1 includes a vertically assembled lower half-base 11 and an upper half-fitting seat 12. The side lugs 13 are mounted on the upper half-fitting seat 12. The lower half-base 11 has a lower rim 15 at its top, and the upper half-fitting seat 12 has an upper rim 16. The upper rim 16 and the lower rim 15 are connected by locking screws 17 and nuts 18, and a sealing ring is provided between them. The opening shape of the upper half-fitting seat 12 is adapted to the shape of the honeycomb panel 9 to be tested. The explosion generating chamber 1 adopts a vertically assembled lower half-base 11 and upper half-fitting seat 12 structure, and is connected by the upper rim 16, lower rim 15, and locking screws 17 and nuts 18, allowing for quick disassembly and assembly of the chamber. This design facilitates cleaning, inspection, or replacement of components inside the chamber before and after testing, significantly improving operational efficiency. Meanwhile, the opening shape of the upper half of the forming seat 12 is adapted to the shape of the honeycomb panel 9 to be tested. The corresponding upper half of the forming seat 12 can be replaced according to the honeycomb panel 9 of different shapes without replacing the entire cavity, which greatly enhances the adaptability of the device to honeycomb panels 9 of different specifications and reduces the testing cost.

[0041] In this embodiment, the honeycomb panel 9 to be tested is rectangular, and the upper half of the forming seat 12 is also rectangular with four side ears 13 arranged on the four sides of the upper half of the forming seat 12. This structure matches the shape and stress characteristics of the rectangular honeycomb panel 9. The honeycomb panel 9 to be tested is rectangular, and the upper half of the forming seat 12 is correspondingly designed as rectangular with a side ear 13 on each of the four sides. Combined with the cross-shaped pre-tightening clamp 5, uniform constraint on the rectangular honeycomb panel 9 can be achieved. The intersecting structure of the cross-shaped pre-tightening clamp 5 covers the center and four sides of the rectangular panel. When the four side ears 13 are connected to the pre-tightening clamp 5 via bolts 6, the pre-tightening force can be evenly transmitted to the four edges and center of the honeycomb panel 9 through the cross-shaped structure, avoiding edge deformation or pre-tightening failure of the honeycomb panel 9 due to excessive force at a single point. This design is particularly suitable for the mechanical properties of rectangular panels, ensuring that they are in a stable pre-tightened state before the explosion and reducing interference with test results due to uneven pre-tightening.

[0042] The cross-shaped pre-tightening clamp 5 covers the center and four sides of the rectangular honeycomb panel 9. During an explosion, when the honeycomb panel 9 is subjected to an upward impact force, the pre-tightening clamp 5, in conjunction with the bolts 6 and springs, constrains the honeycomb panel 9 from multiple key locations. The bolts 6 on the four side lugs 13 are symmetrically distributed, further strengthening the guiding effect on the honeycomb panel 9 and ensuring that it always moves in the preset direction during its up-and-down movement. This prevents the rectangular honeycomb panel 9 from twisting or shifting due to uneven force on its corners, ensuring that the first spring 71 and the second spring 72 function precisely and reducing damage to the honeycomb panel 9 and the device from unexpected impacts.

[0043] Of course, the honeycomb panel 9 to be tested is circular or other polygonal in shape.

[0044] Specifically, the gas supply system 2 includes a gas storage tank, a flow regulating valve, a mixer, and a gas guide pipe 21 connected in sequence. The output end of the gas guide pipe 21 is connected to the explosion generating chamber 1, and a one-way valve is provided on the gas guide pipe 21. The mixer has an air inlet, and an air flow valve is provided at the air inlet to adjust the mixing ratio of air and gas. The gas supply system 2 mixes the gas supplied by the gas storage tank with the air introduced by the air inlet through the mixer. The air flow valve at the air inlet can flexibly adjust the air input. Combined with the control of the gas flow by the flow regulating valve, the mixing ratio of gas and air can be accurately controlled. This design can configure a specific concentration of combustible gas mixture according to test requirements (such as simulating explosion impacts of different intensities), ensuring that the energy generated by each explosion is stable and controllable, avoiding fluctuations in explosion force caused by gas ratio deviations, providing a consistent energy input benchmark for evaluating the explosion resistance performance of the honeycomb panel 9, and improving the repeatability and comparability of test data.

[0045] The gas guide pipe 21 is also equipped with a one-way valve, which strictly restricts the reverse flow of gas and effectively prevents flammable gas or flame in the explosion cavity 1 from flowing back to upstream equipment such as the mixer and gas storage tank through the gas guide pipe 21. This protection mechanism can avoid the risk of backfire causing the gas storage tank to explode or the mixer to be damaged, while preventing secondary explosion caused by backflow of unburned gas mixture. It blocks safety hazards from the gas delivery path and provides reliable safety protection for operators and equipment.

[0046] Furthermore, the gas supply system 2 also includes a vacuum extraction assembly connected to the explosion chamber 1. The vacuum extraction assembly includes a vacuum pump and an extraction pipe 22. One end of the extraction pipe 22 is connected to the explosion chamber 1, and the other end is connected to the vacuum pump. A control valve is installed on the extraction pipe 22. The vacuum extraction assembly, through the vacuum pump and extraction pipe 22, can pre-extract air and residual gas from inside the explosion chamber 1. Combined with the control valve, the extraction process is precisely controlled, significantly reducing the initial gas content inside the chamber. This operation prevents the original air and impurities in the chamber from mixing with the subsequently injected gas, ensuring that the concentration of the combustible mixture entering the chamber is determined solely by the proportioning parameters of the gas supply system 2. This reduces the deviation in explosion energy caused by residual gas interference, further improving the accuracy of the explosion environment simulation and making the impact on the honeycomb panel 9 more closely match the preset test conditions.

[0047] Specifically, the ignition device 3 includes an ignition electrode penetrating the side wall of the explosion generating cavity 1. The inner end of the ignition electrode extends to the central axis of the explosion generating cavity 1, and the outer end is connected to a high-voltage pulse generator. This design ensures that the ignition point is located in the central region of the gas mixture inside the cavity. Because the gas mixture is more uniform and the concentration distribution is more symmetrical at the central axis, the high-voltage pulse released by the high-voltage pulse generator through the ignition electrode can quickly ignite the surrounding gas mixture, avoiding incomplete local combustion or delayed flame propagation caused by the ignition point deviating from the center. This ensures that each explosion generates a symmetrical and stable shock wave inside the cavity, providing a uniform impact load for the honeycomb panel 9 and reducing interference with test results due to ignition deviation.

[0048] Specifically, the dynamic monitoring device includes at least three sets of high-speed cameras 41, which are evenly distributed around the circumference of the explosion cavity 1, with their lenses all facing the honeycomb panel 9 to be tested. This allows for simultaneous recording of the dynamic changes of the honeycomb panel 9 at the moment of explosion from different angles. This multi-view layout covers the entire surface of the honeycomb panel 9, avoiding the omission of key dynamic information due to blind spots in a single viewpoint, such as strain initiation in different areas of the panel, differences in deformation rates, and the starting position of local damage. Through full-angle recording, the entire process of the honeycomb panel 9 from being subjected to force and deformation to potential damage can be completely reconstructed, providing comprehensive image data for subsequent analysis of its dynamic response patterns.

[0049] Furthermore, the dynamic monitoring device also includes multiple strain gauges, which are attached to the top surface of the honeycomb panel 9 to be tested and radially distributed along the center of the honeycomb panel 9. These strain gauges can directly sense the microscopic strain changes of the panel under explosive impact and convert the mechanical signals into electrical signals for real-time output. This quantitative data can accurately reflect the strain magnitude at different radial positions of the panel (such as the strain difference between the central and edge regions), complementing the macroscopic images captured by the high-speed camera 41. The images can intuitively present the deformation morphology, while the strain gauges can provide specific strain values, solving the problem of difficulty in quantifying microscopic forces using only images.

[0050] Furthermore, the dynamic monitoring device also includes a laser displacement sensor 42 installed on the outer wall of the explosion cavity 1. Utilizing the principle of laser ranging, it can record the positional changes of the plate at different times with extremely high precision (typically down to the micrometer level). Especially during large displacement movements such as the plate's upward thrust and subsequent fall, it can accurately quantify key parameters such as its rising height and falling speed. This data, together with the microscopic strain captured by the strain gauge and the images from the high-speed camera 41, forms a three-dimensional complementary system. The strain gauge reflects microscopic mechanical changes, the camera presents macroscopic morphology, and the laser displacement sensor 42 provides precise displacement quantification data, collectively constructing a complete dynamic monitoring system from microscopic to macroscopic, from morphology to numerical values.

[0051] Preferably, the explosion generating cavity 1 is surrounded by an impact shield 8. The impact shield 8 is a cylindrical structure with an open top, and its inner diameter is larger than the outer diameter of the explosion generating cavity 1. It is coaxially arranged with the explosion generating cavity 1 and can form the first physical barrier when an explosion occurs, effectively blocking any flying fragments of the honeycomb panel 9 or device components, preventing them from rushing out of the test area and damaging surrounding equipment or injuring operators. The inner wall of the impact shield 8 is provided with a honeycomb aluminum buffer layer, a polyurethane foam energy-absorbing layer and a steel shell from the inside to the outside, forming a multi-layer protection system: the honeycomb aluminum buffer layer can absorb part of the impact energy through its own structural deformation, slowing down the movement speed of the fragments; the polyurethane foam energy-absorbing layer further buffers and absorbs residual energy, reducing the impact force of the fragments; the steel shell provides final protection with its high strength characteristics, ensuring that the fragments will not penetrate the shield and fundamentally eliminating safety hazards. The impact shield 8 is provided with observation windows corresponding to the high-speed camera 41, and a transparent protective plate is embedded in the observation window. This design ensures that the high-speed camera 41 can normally capture the dynamic changes of the honeycomb panel 9 through the window, while also providing effective protection for the camera to prevent damage to the lens or internal components from shock waves, debris, or dust generated by the explosion. The transparent protective plate does not affect light transmission, ensuring that the images captured by the camera are clearly discernible and guaranteeing the complete acquisition of dynamic monitoring data. At the same time, the overall structure of the impact shield 8 reduces the interference of the airflow generated by the explosion on peripheral equipment such as the laser displacement sensor 42, enabling them to operate stably and improving the reliability of the monitoring data.

[0052] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. An explosion testing device for honeycomb panels, characterized in that, The device includes an explosion-generating cavity with a top opening, a gas supply system for evacuating the explosion-generating cavity and providing gas, an ignition device for igniting the combustible gas inside the explosion-generating cavity, and a dynamic monitoring device located around the explosion-generating cavity. The outer wall of the explosion-generating cavity has at least two side ears, each with a threaded hole. A honeycomb panel to be tested is placed over the opening of the explosion-generating cavity, and the top of the honeycomb panel is pressed down by a pre-tightening member. The pre-tightening member has through holes corresponding to the threaded holes. A bolt is vertically inserted into each through hole of the pre-tightening member, and the tail of the bolt connects to the corresponding threaded hole. A first spring located above the pre-tightening member and a second spring located below the pre-tightening member are fitted onto the bolt. The top of the first spring presses against the head of the bolt, and the bottom of the first spring presses against the top surface of the pre-tightening member. The top of the second spring presses against the bottom surface of the pre-tightening member, and the bottom of the second spring presses against the side ears. The elastic force of the first spring is greater than that of the second spring.

2. The explosion testing device for honeycomb panels according to claim 1, characterized in that, The explosion-generating cavity includes a vertically assembled lower half base and an upper half forming seat. The side ears are set on the upper half forming seat. The top of the lower half base is provided with a lower rim, and the upper half forming seat is provided with an upper rim. The upper and lower rims are connected by locking screws and nuts, and a sealing ring is provided between the upper and lower rims. The opening shape of the upper half forming seat is adapted to the shape of the honeycomb panel to be tested.

3. The explosion testing device for honeycomb panels according to claim 2, characterized in that, The honeycomb panel to be tested is rectangular, and the upper half of the forming seat is rectangular with four side ears arranged on the four sides of the upper half of the forming seat; from a top view, the pre-tightening member is cross-shaped.

4. The explosion testing device for honeycomb panels according to claim 1, characterized in that, The gas supply system includes a gas storage tank, a flow regulating valve, a mixer, and a gas pipe connected in sequence. The output end of the gas pipe is connected to the explosion cavity, and a one-way valve is provided on the gas pipe. The mixer is provided with an air inlet, and an air flow valve is provided at the air inlet to regulate the mixing ratio of air and gas. A one-way valve is also provided on the gas pipe.

5. The explosion testing device for honeycomb panels according to claim 4, characterized in that, The gas supply system also includes a vacuum pumping assembly connected to the explosion cavity; the vacuum pumping assembly includes a vacuum pump and a pumping pipe, one end of the pumping pipe is connected to the explosion cavity, the other end is connected to the vacuum pump, and a control valve is provided on the pumping pipe.

6. The explosion testing device for honeycomb panels according to claim 1, characterized in that, The ignition device includes an ignition electrode that penetrates the side wall of the explosion cavity. The inner end of the ignition electrode extends to the central axis of the explosion cavity, and the outer end is connected to a high-voltage pulse generator.

7. The explosion testing device for honeycomb panels according to claim 1, characterized in that, The dynamic monitoring device includes at least three sets of high-speed cameras, which are evenly distributed around the circumference of the explosion cavity, and the lenses of the cameras are all set to face the honeycomb panel to be tested.

8. The explosion testing apparatus for honeycomb panels according to claim 7, characterized in that, The dynamic monitoring device also includes multiple strain gauges, which are attached to the top surface of the honeycomb panel to be tested and are radially distributed along the center of the honeycomb panel.

9. The explosion testing device for honeycomb panels according to claim 8, characterized in that, The dynamic monitoring device also includes a laser displacement sensor installed on the outer wall of the explosion cavity.

10. The explosion testing apparatus for honeycomb panels according to claim 7, characterized in that, The explosion cavity is surrounded by an impact shield, which is a cylindrical structure with an open top. Its inner diameter is larger than the outer diameter of the explosion cavity and is coaxial with the explosion cavity. The inner wall of the impact shield is provided with a honeycomb aluminum buffer layer, a polyurethane foam energy-absorbing layer and a steel shell from the inside to the outside. The impact shield is provided with observation windows corresponding to the high-speed cameras, and transparent protective plates are embedded in the observation windows.

Images