Explosive impact pressure testing device

Abstract

The application provides an explosive impact pressure testing device, and relates to the technical field of explosives and blasting engineering. The testing device simulates the hole wall where the explosive is located in the actual blasting through a testing pipe, and collects the test data of the detonation products generated after the explosion of the explosive, such as time, instantaneous impact pressure of the detonation products on the inner wall surface of the testing pipe and the like, by cooperating with an information collector. Meanwhile, the detonation products are reduced in energy carried when being discharged from the outlet end of the pressure relief pipe in the form of reverse folding and mutual collision by means of the main pressure relief channel and the auxiliary pressure relief channel, so that the testing device has good repeatability and low external impact power, reduces the high standard dependence of the testing device on the testing site, and avoids the problems of poor test repeatability, high cost, inconvenient operation and difficulty in obtaining stable and reliable data caused by the influence of factors such as geological conditions and charging parameters during the on-site blasting test.

Description

Technical Field

[0001] This application relates to the field of explosives and blasting engineering technology, and more specifically, to an explosive impact pressure testing device. Background Technology

[0002] In precision blasting projects such as contour blasting and micro-disturbance controlled blasting, accurate measurement of the instantaneous impact pressure of the explosive load on the borehole wall is crucial. This pressure is the initial parameter of the explosive energy acting on the surrounding rock, and its peak value, duration of action, and spatial distribution directly determine the damage range, fracture propagation degree, and final contour surface formation quality of the rock mass. It is a key basis for precise blasting design and achieving "micro-disturbance" control.

[0003] Current predictions and assessments of blasting effects heavily rely on theoretical assumptions based on empirical formulas, rather than using high-fidelity measured data to calibrate models. This leads to significant discrepancies between numerical simulation results and actual physical processes, reducing the accuracy and reliability of engineering designs. Summary of the Invention

[0004] The purpose of this application is to provide an explosive impact pressure testing device to address the shortcomings of the prior art.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0006] One aspect of this application provides an explosive impact pressure testing device, comprising: a base; a test tube with a closed end and an open end at opposite ends, the test tube being fixed to the base and configured to hold an explosive capable of forming detonation products, and an auxiliary through hole being formed in the inner peripheral wall of the test tube; an information collector disposed on the test tube and configured to collect test data of the detonation products; a pressure relief pipe with a closed end and an outlet end at opposite ends, the pressure relief pipe being sleeved on the open end through the outlet end, a first gap being between the open end and the closed end, the central axes of the pressure relief pipe and the test tube coinciding, and an annular gap being between the inner peripheral wall of the pressure relief pipe and the outer peripheral wall of the test tube; the test tube sequentially connecting the open end, the first gap, the annular gap and the outlet end to form a main pressure relief channel, the auxiliary through hole forming an auxiliary pressure relief channel connecting to the annular gap, the flow direction of the detonation products in the main pressure relief channel within the annular gap being the main pressure relief direction, and the flow direction of the detonation products in the auxiliary pressure relief channel having a component opposite to the main pressure relief direction.

[0007] Optionally, a number of auxiliary through holes and flow guiding micro-protrusions are provided on the inner peripheral wall of the test tube. Each flow guiding micro-protrusion has an auxiliary through hole distributed on both sides of its opposite side. The auxiliary through holes distributed on both sides of the flow guiding micro-protrusions are arranged along the axial direction of the test tube. The flow guiding micro-protrusions are configured to guide the detonation products in the test tube into the auxiliary through holes on their opposite sides.

[0008] Optionally, the explosive impact pressure testing device further includes: a conical protrusion disposed at the closed end and located inside the pressure relief pipe, the tip of the conical protrusion extending toward the open end, and the outer peripheral surface of the conical protrusion and the end face of the closed end forming a smooth curved surface.

[0009] Optionally, the explosive impact pressure testing device satisfies:

[0010] ,in, The inner turning radius, The hydraulic diameter of the annular gap;

[0011] And / or, In the smooth curved surface, the line shape of the end face of the closed end on the axial section of the pressure relief pipe includes two circular arcs. Let be the radius of the circle containing the arc. The width of the annular gap;

[0012] And / or, , The distance between the open end and the closed end. The inner diameter of the test tube;

[0013] And / or, the test tube has a receiving hole for placing explosives, the receiving hole having a tapered section communicating to the open end, the radial cross-section of the tapered section gradually increasing from the open end to the closed end, and satisfying: , It is the semi-cone angle of the conical hole section.

[0014] Optionally, the tapered protrusion satisfies:

[0015] ,in, The height of the conical protrusion. The inner diameter of the test tube;

[0016] Alternatively, the apex angle of the conical protrusion is 90° or 60°.

[0017] Optionally, the radial cross-section of the pressure relief pipe gradually increases from the closed end to the outlet end.

[0018] Optionally, the explosive impact pressure testing device further includes: a protective plate, which is fixedly sleeved on the outer periphery of the test tube, with the surface of the protective plate facing the outlet end, and the surface of the protective plate and the outlet end having a preset distance.

[0019] Optionally, the test tube includes a head tube and a tail tube, which are connected. The end of the head tube away from the tail tube is a closed end, and the end of the tail tube away from the head tube is an open end. The head tube and the tail tube are detachably connected.

[0020] Optionally, the information collector includes:

[0021] Several sensors are arranged on the inner circumferential wall of the test tube;

[0022] The processor is connected to the sensor signal;

[0023] The explosive impact pressure testing device also includes:

[0024] The notch is created on the outer peripheral wall of the test tube;

[0025] A cover plate that covers the notch and is detachably connected to the notch, with the sensor embedded in the inner wall of the cover plate.

[0026] Optionally, the explosive impact pressure testing device also includes:

[0027] A positioning element is installed inside the test tube. The positioning element has a mounting position for installing explosives. The mounting position is located on the central axis of the test tube. A through hole is opened on the positioning element to connect the opposite sides of the positioning element.

[0028] The beneficial effects of this application include:

[0029] This application provides an explosive impact pressure testing device, which uses a test tube to simulate the hole wall where the explosive is located in an actual blast, and uses an information acquisition device to collect test data of the detonation products generated after the explosive explosion, such as time and the instantaneous impact pressure formed by the detonation products on the inner wall surface of the test tube. Simultaneously, the pressure relief pipe and the test pipe are interlocked to construct a pressure relief path for the detonation products. Specifically, the test pipe is sequentially connected through the open end, the first gap, the annular gap, and the outlet end to form a main pressure relief channel with a bend. This allows the detonation products to flow out from the outlet end of the pressure relief pipe in a reverse bend after being guided by the main pressure relief channel. Based on this, an auxiliary pressure relief channel is formed by using an auxiliary through hole. The detonation products in the auxiliary pressure relief channel counteract the flow of detonation products in the annular gap of the main pressure relief channel, reducing the energy carried by the detonation products when they are discharged from the outlet end of the pressure relief pipe. This results in better repeatability and lower external impact force for the testing device, reducing the high standard dependence of the testing device on the testing site. It also avoids the problems of poor test repeatability, high cost, inconvenient operation, and difficulty in obtaining stable and reliable data caused by factors such as geological conditions and charge parameters during on-site blasting tests. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1An isometric view of an explosive impact pressure testing device provided in an embodiment of this application;

[0032] Figure 2 One of the partial cross-sectional views of an explosive impact pressure testing device provided in the embodiments of this application;

[0033] Figure 3 for Figure 2 One of the enlarged views of a part;

[0034] Figure 4 for Figure 2 Part 2 of the enlarged view;

[0035] Figure 5 A second partial cross-sectional view of an explosive impact pressure testing device provided in an embodiment of this application;

[0036] Figure 6 A radial cross-sectional view of a test tube provided in an embodiment of this application;

[0037] Figure 7 This is a schematic diagram showing the relationship between the local resistance coefficient within the first gap and the relative bending radius.

[0038] Icons: 100-Base; 101-Rectangular base frame; 102-Trapezoidal support; 103-Reinforcing beam; 104-Clamp; 200-Test tube; 201-Flange; 202-Closed end; 203-Open end; 210-Head tube; 220-Middle tube; 230-Tail tube; 232-Auxiliary through hole; 2321-First orifice; 2322-Second orifice; 233-Drainage micro-protrusion; 2331-Upstream face; 2332-Downstream face; 235-Main pressure relief channel; 236 - Auxiliary pressure relief direction; 237 - Main pressure relief direction; 251 - Notch; 252 - Cover plate; 253 - Step; 260 - Positioning component; 261 - Annular center frame; 262 - Support leg; 263 - Mounting position; 264 - Through hole; 300 - Pressure relief pipe; 301 - Conical protrusion; 3011 - Smooth curved surface; 302 - Closed end; 303 - Outlet end; 304 - Arc; 305 - Outer peripheral surface of conical protrusion; 400 - Protective plate; a - First gap; b - Annular gap. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the description is only a part of the embodiments of this application and is not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0040] Current methods for predicting and assessing blasting effects heavily rely on theoretical assumptions based on empirical formulas, rather than using high-fidelity measured data to calibrate models. This leads to significant discrepancies between numerical simulation results and actual physical processes, reducing the accuracy and reliability of engineering designs. Furthermore, field blasting tests are susceptible to the influence of geological conditions, charge parameters, and other factors, resulting in poor repeatability, high costs, operational inconvenience, and difficulty in obtaining stable and reliable data.

[0041] In view of this, another aspect of the embodiments of this application provides an explosive impact pressure testing device, comprising: a base; a test tube with a closed end and an open end at opposite ends, the test tube being fixed to the base and configured to hold an explosive capable of forming detonation products, and an auxiliary through hole being formed in the inner peripheral wall of the test tube; an information collector disposed on the test tube and configured to collect test data of the detonation products; a pressure relief pipe with a closed end and an outlet end at opposite ends, the pressure relief pipe being sleeved on the open end through the outlet end, a first gap being between the open end and the closed end, the central axes of the pressure relief pipe and the test tube coinciding, and an annular gap being between the inner peripheral wall of the pressure relief pipe and the outer peripheral wall of the test tube; the test tube sequentially connecting the open end, the first gap, the annular gap and the outlet end to form a main pressure relief channel, the auxiliary through hole forming an auxiliary pressure relief channel connecting to the annular gap, the flow direction of the detonation products in the main pressure relief channel within the annular gap being the main pressure relief direction, and the flow direction of the detonation products in the auxiliary pressure relief channel having a component opposite to the main pressure relief direction.

[0042] The explosive impact pressure testing device uses a test tube to simulate the borehole wall where the explosive is located in an actual blast. It works with an information acquisition device to collect test data on the detonation products generated after the explosive explosion, such as time and the instantaneous impact pressure formed by the detonation products on the inner wall of the test tube. Simultaneously, the pressure relief pipe and the test pipe are interlocked to construct a pressure relief path for the detonation products. Specifically, the test pipe is sequentially connected through the open end, the first gap, the annular gap, and the outlet end to form a main pressure relief channel with a bend. This allows the detonation products to flow out from the outlet end of the pressure relief pipe in a reverse bend after being guided by the main pressure relief channel. Based on this, an auxiliary pressure relief channel is formed by using an auxiliary through hole. The detonation products in the auxiliary pressure relief channel counteract the flow of detonation products in the annular gap of the main pressure relief channel, reducing the energy carried by the detonation products when they are discharged from the outlet end of the pressure relief pipe. This results in better repeatability and lower external impact force for the testing device, reducing the high standard dependence of the testing device on the testing site. It also avoids the problems of poor test repeatability, high cost, inconvenient operation, and difficulty in obtaining stable and reliable data caused by factors such as geological conditions and charge parameters during on-site blasting tests.

[0043] Figure 1 This is an isometric view of an impact force testing device provided in an embodiment of this application. Figure 2 This is one of the partial cross-sectional views of an explosive impact pressure testing device provided in an embodiment of this application. Figure 3 and Figure 4 All are Figure 2 Magnified views of different locations within the image. Combined with... Figure 1 , Figure 2 , Figure 3 and Figure 4 The diagram shows an explosive impact pressure testing device comprising a base 100, a test tube 200, a pressure relief tube 300, and an information acquisition device.

[0044] The base 100 is fixed to the test site, providing support for the test tube 200, pressure relief pipe 300, etc. As the bottom load-bearing structure, the base 100 can employ various reinforcing structures to withstand the impact force transmitted after the explosive detonation, such as... Figure 1 In the design, the base 100 comprises a rectangular base frame 101, a trapezoidal support 102, and multiple reinforcing beams 103, which can be made of impact-resistant metal. When fixing the base 100 to the test site, concrete pouring and bolt connection can be used, such as by constructing a concrete foundation; pre-embedding a reinforcing cage; pouring a 1500mm×1500mm×600mm foundation base using C35 reinforced concrete; vertically inserting an immersion vibrator into the concrete to compact it; and reserving multiple anchor bolts for easy fixing to the base 100.

[0045] The test tube 200 is fixed to the base 100, for example, using a detachable design. This allows for the individual replacement of the test tube 200, such as replacing it with a test tube of a different specification to meet the testing requirements for the aperture, or replacing a damaged test tube 200 with a new one. For details, please refer to [link / reference]. Figure 1 The test tube 200 is fixed to the top of the base 100 using multiple clamps 104 at multiple points along the axial direction of the test tube 200. The test tube 200 is hollow inside and contains explosives, such as conventional explosives like TNT or unconventional explosives like novel explosives composed of CO2 fracturing agent. After the explosives are detonated, they can produce detonation products (mainly gas).

[0046] Please continue to refer to Figure 1 and Figure 2 The test tube 200 has a closed end 202 and an open end 203 at its two ends, which guides the detonation products to flow from the closed end 202 to the open end 203. An auxiliary through-hole 232 is formed on the inner circumferential wall of the test tube 200, positioned close to the open end 203. When there are multiple auxiliary through-holes 232, they can be distributed circumferentially along the test tube 200.

[0047] The pressure relief tube 300 is fixed to the base 100. The pressure relief tube 300 is hollow inside, and its two ends are a closed end 302 and an outlet end 303, respectively. The open end 203 of the test tube 200 extends into the pressure relief tube 300 through the outlet end 303, so that the pressure relief tube 300 is sleeved on the outer periphery of the test tube 200 through the outlet end 303. At the same time, the auxiliary through hole 232 is also located inside the pressure relief tube 300. The open end 203 does not abut against the closed end 302, but has a first gap a between them to ensure the flow of detonation products in this area. At the same time, by means of the arrangement of the open end 203 and the closed end 302 opposite each other and separated by the first gap a, the detonation products can be guided to reverse here. There is an annular gap b between the inner peripheral wall of the pressure relief pipe 300 and the outer peripheral wall of the test pipe 200, and the central axes of the pressure relief pipe 300 and the test pipe 200 coincide, which ensures that the detonation products are distributed relatively evenly when flowing in this region. At the same time, the internal space of the test pipe 200 can also be connected to the annular gap b through the auxiliary through hole 232.

[0048] Please continue to refer to Figure 2 The test tube 200 is sequentially connected through the open end 203, the first gap a, the annular gap b, and the outlet end 303 to form a main pressure relief channel 235. The auxiliary through hole 232 forms an auxiliary pressure relief channel connected to the annular gap b. When the explosive detonates, detonation products are formed. The detonation products flow from the closed end 202 toward the open end 203 in the test tube 200. Most of the detonation products will flow outward through the main pressure relief channel 235 to relieve pressure. At the same time, a small part of the detonation products will enter the annular gap b through the auxiliary pressure relief channel (the airflow direction after guidance is called the auxiliary pressure relief direction 236) and then be carried by the detonation products flowing to the annular gap b in the main pressure relief channel 235 and flow outward through the outlet end 303.

[0049] The detonation products in the main pressure relief channel 235 flow out through the open end 203 and first flow into the first gap a. Guided by the closed end 302, they are reversed and flow into the annular gap b, thereby weakening the energy carried by the detonation products in the main pressure relief channel 235. For ease of description, please refer to... Figure 3The flow direction of the detonation products in the main pressure relief channel 235 within the annular gap b is referred to as the main pressure relief direction 237. The flow direction of the detonation products in the auxiliary pressure relief channel (auxiliary pressure relief direction 236) has a component opposite to the main pressure relief direction 237. In this way, the detonation products in the auxiliary pressure relief channel can counteract the detonation products flowing from the main pressure relief channel 235 to the annular gap b, thereby weakening the energy carried by the detonation products flowing from the main pressure relief channel 235 to the annular gap b. Ultimately, this reduces the energy carried by the detonation products when they are discharged from the outlet end 303 of the pressure relief pipe 300. This results in better repeatability and lower external impact force for the testing device, reducing the high standard dependence of the testing device on the testing site. It also avoids the problems of poor test repeatability, high cost, inconvenient operation, and difficulty in obtaining stable and reliable data caused by factors such as geological conditions and charge parameters during on-site blasting tests.

[0050] The data acquisition device is installed in the test tube 200. It needs to collect test data on the detonation products generated after the explosive explosion, such as the time and the instantaneous impact pressure exerted by the detonation products on the inner wall of the test tube 200. Therefore, the data acquisition device needs to be in direct or indirect contact with the detonation products to sense the extent of their impact.

[0051] In some possible implementations, the data acquisition unit includes a signal-connected processor and several sensors, such as pressure sensors and stress sensors. Test data is acquired by placing sensors at multiple locations on the test tube 200, for example, along the axial direction and circumferential direction (around the axis). This allows for the acquisition of multi-point test data along the axial direction and multi-directional test data along the circumferential direction. The processor can be a built-in processor in the data acquisition unit. Based on the processor's built-in program (which can be an existing mature program), the required data can be directly displayed on an external display device, such as directly outputting pressure-time curves.

[0052] In some possible implementations, please refer to Figure 3 The auxiliary through-hole 232 includes a first orifice 2321 and a second orifice 2322 that are interconnected. The first orifice 2321 is located on the inner peripheral wall of the test tube 200, and the second orifice 2322 is located on the outer peripheral wall of the test tube 200. The direction from the first orifice 2321 to the second orifice 2322 is inclined at a predetermined angle toward the closed end 302 of the pressure relief tube 300. In other words, the position of the second orifice 2322 relative to the first orifice 2321 is more biased toward the closed end 302, so that the line connecting the two is inclined toward the closed end 302. This allows the auxiliary pressure relief direction 236 to generate a component, the direction of which is opposite to the main pressure relief direction 237.

[0053] In some possible implementations, the drainage micro-protrusions 233 are disposed on the inner peripheral wall of the test tube 200, and an auxiliary through hole 232 is distributed on each of the opposite sides of each drainage micro-protrusion 233. The auxiliary through holes 232 distributed on the opposite sides of the drainage micro-protrusions 233 are arranged along the axial direction of the test tube 200. The drainage micro-protrusions 233 are configured to guide the detonation products in the test tube 200 into the auxiliary through holes 232 on their opposite sides respectively.

[0054] For details, please refer to the following: Figure 2 and Figure 3 The test tube 200 is provided with three auxiliary through holes 232 and two flow-guiding micro-protrusions 233, which are arranged alternately along the axial direction of the test tube 200, such that an auxiliary through hole 232 is distributed on each side of the flow-guiding micro-protrusion 233. The flow-guiding micro-protrusion 233 has a frontal surface 2331 and a backal surface 2332. The frontal surface 2331 can guide the detonation products in the test tube into the auxiliary through hole 232 on the left side of the flow-guiding micro-protrusion 233, and the backal surface 2332 can guide the detonation products that have not entered the auxiliary through hole 232 on the left side to continue into the auxiliary through hole 232 on the right side. The frontal surface 2331 is an inclined and concave curved surface (the curved surface partially surrounds the periphery of the first orifice 2321), and its inclination angle can be set with reference to the preset angle of the auxiliary through hole 232. The backflow surface 2332 can be an inclined and convex curved surface, the convex height of which gradually decreases along the flow direction of the detonation products in the test tube 200.

[0055] In some possible implementations, the protrusion height (maximum value) of the drainage micro-protrusion 233 is between 1 / 5 and 1 / 10 of the inner diameter of the test tube 200. This can both control the flow rate of detonation products into the auxiliary pressure relief channel and balance the turbulence caused by the drainage micro-protrusion 233 in the test tube 200.

[0056] In some possible implementations, such as Figure 2 As shown, a conical protrusion 301 is disposed on the end face of the closed end 302 of the pressure relief pipe 300 and is located inside the pressure relief pipe 300. The bottom end of the conical protrusion 301 is fixed to the inner wall of the pressure relief pipe 300. The small end of the conical protrusion 301 is a tip, and the tip of the conical protrusion 301 extends toward the open end 203 of the test pipe 200. In this way, the detonation products flowing out of the open end 203 of the test pipe 200 are changed from axial flow to radial dispersion under the guidance of the conical protrusion 301. The tip can eliminate the dead zone in the center of the airflow, make full use of the space inside the pipe for flow, and reduce the impact of the airflow on the conical protrusion 301. The outer peripheral surface 305 of the conical protrusion can continue to guide the airflow to change direction. Combined with the guidance of the end face of the closed end 302, the airflow is reversed and smoothly flows into the annular gap b.

[0057] When the gas flows out from the open end 203 of the test tube 200, it essentially forms a confined impingement jet. Figure 2 The mechanical structure shown mainly consists of two parts: a stagnation zone and a corner vortex. The stagnation zone is located at the tip of the conical protrusion and on its outer peripheral surface, while the corner vortex is located at the junction of the outer peripheral surface of the conical protrusion and the end face of the closed end. Within the stagnation zone, the axial velocity of the fluid is forced to zero, converting kinetic energy into pressure energy, forming a high-pressure stagnation point. This high-pressure zone drives the fluid to accelerate radially outward, forming a wall jet. When the wall jet reaches the outer peripheral surface of the conical protrusion 301 and the end face of the closed end 302, the fluid must turn 90 degrees to avoid separation due to impact with the sidewall, forming a closed annular vortex (the annular vortex region does not participate in the main circulation, wasting channel volume and dissipating energy). Therefore, in some possible embodiments, such as... Figure 2 and Figure 4 As shown, the outer peripheral surface 305 of the conical convex portion and the end face of the closed end 302 successively form a smooth curved surface 3011. This allows the wall jet to smoothly adhere to the smooth curved surface 3011 and change direction, making full use of the channel volume, avoiding the generation of corner vortices, thereby stabilizing the flow field, reducing pressure drop, and maintaining momentum conservation. Furthermore, during this process, the outer peripheral surface 305 of the conical convex portion guides the airflow to gradually change direction during dispersion, and then, with the help of the curved surface shape of the end face of the closed end 302, completes the remaining smooth change, ultimately achieving a 180° reverse turn, thus entering the annular gap b. Figure 2 or Figure 5 As shown, the inner circumferential wall surface of the pressure relief pipe 300 and the end face of its closed end 302 have a smooth transition.

[0058] Because the region where the first gap a is located has an inward turning angle where the airflow makes a large 180° turn, it is a region where flow separation is very likely to occur. Therefore, to prevent the formation of a constriction, the gas is made to bend along the wall. Based on Figure 2 The test tube 200 and the pressure relief tube 300 shown are fitted with a reverse folding structure. The results can be obtained by conducting the test. Figure 7 The local resistance coefficient (ζ) within the first gap a shown varies with the relative bending radius ( The curve showing the relationship between the changes in ) and the curves showing the changes in ) combined with Figure 4 and Figure 7 It can be seen that when the explosive impact pressure testing device meets the following conditions: ,in, In the smooth curved surface 3011, the line shape of the end face of the closed end 302 on the axial section of the pressure relief pipe includes two circular arcs 304. The circle containing arc 304 ( Figure 4 The radius of the dashed circle shown in the image (and only the circle containing arc 304 is shown) is... The hydraulic diameter of the annular gap (the equivalent diameter that can represent the flow capacity of the annular gap). , (where b is the width of the annular gap) enables the airflow to have lower flow resistance during the reverse turn.

[0059] In some possible implementations, please refer to Figure 2 and Figure 3 As shown, the hollow region inside the test tube 200 is called the receiving hole. The receiving hole has a tapered section that connects to the open end 203. The radial cross-section of the tapered section gradually increases from the open end 203 to the closed end 302, and satisfies the following: , This is the half-cone angle of the conical aperture section (i.e., the angle between the inner wall surface of the conical aperture section and the axial direction of the test tube). In this way, pre-acceleration and turning begin before the detonation products leave the test tube by 20°, which better enables the subsequent reverse turning.

[0060] In some possible implementations, combined Figure 2 and Figure 4 The explosive impact pressure testing device meets the following requirements: In the smooth curved surface 3011, the line shape of the end face of the closed end 302 on the axial section of the pressure relief pipe 300 includes two circular arcs 304. The circle containing arc 304 ( Figure 4 The radius of the dashed circle shown in the image (and only the circle containing arc 304 is shown) is... The width of the annular gap b is... , The inner diameter of the pressure relief pipe is 300. The outer diameter of the test tube 200. The end face of the closed end 302 in the smooth curved surface 3011 connects the outer peripheral surface 305 of the conical protrusion and the inner peripheral wall surface of the pressure relief tube 300. Therefore, when... When the above relationship is satisfied, the designed arc 304 can have good guiding properties, ensuring that the detonation products will not undergo secondary separation at the inner circumferential wall of the pressure relief pipe 300 when they reverse and enter the annular gap b.

[0061] In some possible implementations, such as Figure 2 and Figure 4 As shown, the explosive impact pressure testing device satisfies: , The distance between the open end 203 and the closed end 302. The inner diameter of the test tube is 200. That is, the axial distance from the open end 203 to the closed end 302, when When the value of satisfies the above relationship, it can avoid the problems of acceleration caused by too small a spacing and flow loss caused by too large a spacing.

[0062] Based on this, the verification formula is given: This means ensuring that the flow area of ​​the cylindrical surface is greater than or equal to the radial cross-sectional area of ​​the test tube 200. This formula includes a 20% margin to compensate for flow resistance when turning.

[0063] In some possible implementations, please refer to Figure 4 As shown, the tapered protrusion 301 satisfies: ,in, The height of the conical protrusion 301 The inner diameter of the test tube is 200.

[0064] In some possible implementations, please refer to Figure 4 The apex angle of the conical protrusion 301 is 90° or 60°. When the apex angle is 60°, it is sharper, resulting in higher flow rates of detonation products.

[0065] In some possible implementations, such as Figure 2 As shown, the radial cross-section of the pressure relief pipe 300 can be a constant diameter structure.

[0066] In some possible implementations, such as Figure 5 As shown, the radial cross-section of the pressure relief pipe 300 gradually increases from the closed end 302 to the outlet end 303, which helps to slow down the flow velocity of the detonation products in the main pressure relief channel 235 and reduce the impact force when they are released.

[0067] In some possible implementations, such as Figure 1 , Figure 2 or Figure 5 As shown, a protective plate 400 is fitted around the outer periphery of the test tube 200. The surface of the protective plate 400 is directly opposite the outlet end 303 of the pressure relief pipe 300, and there is a preset distance between the surface of the protective plate 400 and the outlet end 303 of the pressure relief pipe 300. This allows the protective plate 400 to further block the outflow of gas.

[0068] In some possible implementations, such as Figure 1 and Figure 2 As shown, the test tube 200 includes a head tube 210 and a middle tube 220 that are interconnected and communicate with each other. Figure 1 The test tube 200 has two sections shown (optional) and a tail tube 230. The closed end 202 of the test tube 200 is the end of the head tube 210 away from the tail tube 230, and the open end 203 of the test tube 200 is the end of the tail tube 230 away from the head tube 210. The head tube 210 and the tail tube 230 are detachably connected, for example, through a flange 201 and bolts. This modularizes the test tube 200, facilitating localized repair or replacement.

[0069] In some possible implementations, such as Figure 6 As shown, a notch 251 and a cover plate 252 covering the notch 251 are formed on the outer peripheral wall of the test tube 200. The cover plate 252 and the notch 251 are detachably connected, and the sensor is embedded in the inner wall surface of the cover plate 252. This embedded method minimizes the sensor's protrusion from the inner peripheral wall surface of the test tube 200, improving the accuracy of test data sensing. It also facilitates sensor protection. The sensor installation method, which involves installing the sensor through the cover plate 252 and then reinstalling it, improves installation convenience. Explosives can also be installed using the notch 251. A step 253 can be provided at the joint between the cover plate 252 and the notch 251 to facilitate better fixation with screws or similar devices.

[0070] In some possible implementations, such as Figure 6 As shown, a positioning element 260 is provided inside the test tube 200. The mounting position 263 on the positioning element 260 is located on the central axis of the test tube 200. The mounting position 263 is used to mount the explosive, which improves the accuracy of the test. A through hole 264 is formed on the positioning element 260 to facilitate the smooth decompression of the gas flow generated by the explosion. Specifically, for example... Figure 6 As shown, the positioning component 260 includes an annular central frame 261 and several legs 262. The inner ring of the annular central frame 261 is the mounting position 263, where the explosive can be installed. One end of each leg 262 is fixed to the periphery of the central frame, and the other end abuts against the inner peripheral wall of the test tube 200. All legs 262 are of equal length so that the mounting position 263 of the annular central frame 261 is located on the central axis of the test tube 200. A through hole 264 is formed between the legs 262, connecting the spaces on opposite sides of the positioning component 260. Alternatively, the positioning component 260 can be a plate whose shape matches the radial cross-section inside the test tube 200, so that the periphery of the plate is tightly against the inner peripheral wall of the test tube 200. A mounting hole is formed in the center of the plate, and the explosive is installed in the mounting hole. Detonation can then be achieved using an initiation device. The detonation device can be connected to the explosive wirelessly or via wire. When a wired connection is used, the wiring harness extends from the cover plate 252 and the notch 251.

[0071] In some possible implementations, the radial cross-section of the auxiliary through-hole 232 gradually decreases from the first orifice 2321 to the second orifice 2322. This increases the flow velocity of the detonation products flowing out of the auxiliary pressure relief channel, thereby enhancing its obstruction effect on the detonation products located within the annular gap b in the main pressure relief channel 235.

[0072] In some possible implementations, the auxiliary through holes 232 are divided into multiple groups, with each group of auxiliary through holes 232 arranged linearly along the axial direction of the test tube 200. Within each group, the density of the auxiliary through holes 232 near both ends is less than that in the middle. Considering that the detonation products at the auxiliary through holes 232 near the open end 203 of the test tube 200 are in the process of transitioning from the first gap a to the annular gap b, the density of the auxiliary through holes 232 arranged here is appropriately reduced to avoid excessive obstruction to the smooth entry of the detonation products into the annular gap b, while also reducing turbulence at this location. The density of the auxiliary through holes 232 near the middle should be denser to allow for sufficient counter-current. The number of auxiliary through holes 232 near the closed end 202 of the test tube 200 can be reduced to decrease the difficulty of detonation product leakage.

[0073] In some possible implementations, this application may include a detonation device that controls the detonation of the explosive.

[0074] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0075] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0076] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0077] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0078] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. An explosive impact pressure testing device, characterized in that, include: Base; The test tube has a closed end and an open end at opposite ends. The test tube is fixed to the base and configured to hold explosives that can form detonation products. An auxiliary through hole is opened in the inner peripheral wall of the test tube. An information collector is disposed in the test tube and configured to collect test data of the detonation products; The pressure relief tube has a closed end and an outlet end at opposite ends. The pressure relief tube is sleeved on the open end through the outlet end. There is a first gap between the open end and the closed end. The central axes of the pressure relief tube and the test tube coincide, and there is an annular gap between the inner peripheral wall of the pressure relief tube and the outer peripheral wall of the test tube. The test tube is sequentially connected through the open end, the first gap, the annular gap and the outlet end to form a main pressure relief channel. The auxiliary through hole forms an auxiliary pressure relief channel connected to the annular gap. The flow direction of the detonation products in the main pressure relief channel in the annular gap is the main pressure relief direction. The flow direction of the detonation products in the auxiliary pressure relief channel has a component opposite to the main pressure relief direction. A number of the aforementioned auxiliary through holes; A flow-guiding micro-protrusion is disposed on the inner peripheral wall of the test tube. Each flow-guiding micro-protrusion has an auxiliary through hole distributed on both sides of its opposite side. The auxiliary through holes distributed on both sides of the flow-guiding micro-protrusion are arranged along the axial direction of the test tube. The flow-guiding micro-protrusion is configured to guide the detonation products in the test tube into the auxiliary through holes on both sides of its opposite side. The explosive impact pressure testing device also includes: A tapered protrusion is disposed at the closed end and located inside the pressure relief pipe. The tip of the tapered protrusion extends toward the open end, and the outer peripheral surface of the tapered protrusion and the end face of the closed end are connected to form a smooth curved surface.

2. The explosive impact pressure testing device as described in claim 1, characterized in that, The explosive impact pressure testing device meets the following requirements: In the smooth curved surface, the line shape of the end face of the closed end on the axial section of the pressure relief pipe includes two circular arcs. Let be the radius of the circle containing the arc. The hydraulic diameter of the annular gap; And / or, In the smooth curved surface, the line shape of the end face of the closed end on the axial section of the pressure relief pipe includes two circular arcs. Let be the radius of the circle containing the arc. The width of the annular gap; And / or, , The distance between the open end and the closed end. The inner diameter of the test tube; And / or, the test tube has a receiving hole for placing the explosive, the receiving hole having a tapered section communicating to the open end, the radial cross-section of the tapered section gradually increasing from the open end to the closed end, and satisfying: , The semi-cone angle of the conical hole segment is given.

3. The explosive impact pressure testing device as described in claim 1, characterized in that, The tapered protrusion satisfies: ,in, The height of the tapered protrusion. The inner diameter of the test tube; Alternatively, the apex angle of the conical protrusion is 90° or 60°.

4. The explosive impact pressure testing device as described in claim 1, characterized in that, The radial cross-section of the pressure relief pipe gradually increases from the closed end to the outlet end.

5. The explosive impact pressure testing device as described in claim 1, characterized in that, The explosive impact pressure testing device also includes: A protective plate is fixedly sleeved on the outer periphery of the test tube. The surface of the protective plate is directly opposite the outlet end, and there is a preset distance between the surface of the protective plate and the outlet end.

6. The explosive impact pressure testing device as described in claim 1, characterized in that, The test tube includes a head tube and a tail tube, the head tube is connected to the tail tube, the end of the head tube opposite to the tail tube is the closed end, and the end of the tail tube opposite to the head tube is the open end. The head tube and the tail tube are detachably connected.

7. The explosive impact pressure testing device as described in claim 1, characterized in that, The information collector includes: A plurality of sensors are disposed on the inner peripheral wall of the test tube; The processor is connected to the sensor signal; The explosive impact pressure testing device also includes: A notch is formed on the outer peripheral wall of the test tube; A cover plate that covers the notch and is detachably connected to the notch, wherein the sensor is embedded in the inner wall of the cover plate.

8. The explosive impact pressure testing device as described in claim 1, characterized in that, The explosive impact pressure testing device also includes: A positioning element is disposed inside the test tube. The positioning element has a mounting position for installing the explosive. The mounting position is located on the central axis of the test tube. A through hole is formed on the positioning element to connect opposite sides of the positioning element.

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