CN113375612B - Device and method for testing critical detonation size of explosive based on 3D ink-jet charging - Google Patents
Device and method for testing critical detonation size of explosive based on 3D ink-jet charging Download PDFInfo
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Abstract
The invention discloses a device and a method for testing critical booster size of explosive based on 3D ink-jet charging. The test board comprises a lower test board, a first upper test board and a second upper test board; the middle part of the lower test board is provided with a lower test board wedge-shaped medicine loading groove which consists of a spiral wedge-shaped groove and an equal-radius circular wedge-shaped groove; the first upper test board is provided with crescent-shaped hole grooves for placing detonator detonating powder charges and screw grooves matched with the screw grooves of the lower test board; the second upper test board is also provided with an upper test board wedge-shaped drug loading groove compared with the first upper test board, the shape and the size of the upper test board wedge-shaped drug loading groove are the same as those of the equal-radius arc wedge-shaped groove of the lower test board, but the directions of the starting end and the tail end are opposite. The invention can test the critical booster size of the explosive with the critical diameter of less than 3mm, improves the defect of the critical diameter of the traditional wedge-shaped explosive charging test explosive, has smaller volume of the test device, and can more accurately test the critical booster size of the explosive.
Description
Technical Field
The invention belongs to the field of explosive detonation and explosion performance testing, and particularly relates to a device and a method for testing the critical detonation propagation size of an explosive based on 3D ink-jet charging.
Background
The critical diameter of the explosive is the minimum charge diameter of stable detonation propagation under a certain charge density, and is an important parameter for describing the dynamic behavior of detonation propagation of the explosive. If the diameter of the charge is smaller than the critical diameter, detonation cannot be stably propagated, and explosion quenching can occur.
The traditional explosive critical diameter measuring methods mainly comprise the following steps:
1) machining The charge into a conical shape, detonating from The large end, and obtaining a critical diameter from The blowout position (Salyer T R, Hill L G. The dynamics of failure in The semiconductor PBX 9502 charges [ C ]// The third Symposium (International) on detonation, 2006.); the defects are that the cone angle needs to be reduced as much as possible in order to reduce errors, and the experiment amount and the sample preparation difficulty are increased.
2) The method comprises the following steps of (1) detonating from the end face with the largest diameter by adopting a stepped explosive column, carrying out detonation and explosive propagation with the diameter sequentially reduced, and obtaining the critical diameter from the explosion quenching position (Luchunrong, Liuyu deposit, the influence of the particle size of RDX on the critical sectional area [ J ]. the university of China and North China: Nature science edition, 2004, 25(5): 368-; the defects are that the sample preparation difficulty is higher when the charged grain is close to the critical diameter.
3) The use of a wedge charge, initiated from the large end, yields a critical diameter from the explosion quenching position (Yang bin, Chen Rong, Cao Xiao hong). Effect of particle size of RDX explosives on detonation performance [ J ] initiating explosive, 2004(03):55-57+61+ 5.); the defect is that the detonation stopping position is difficult to accurately judge, and under the strong constraint condition, the detonation stopping position of the wedge-shaped explosive is closer to the tail end than the critical diameter position, and the measured critical thickness is generally smaller than the critical diameter of the explosive.
Disclosure of Invention
The invention aims to provide a device and a method for testing the critical booster size of an explosive based on 3D ink-jet charging.
The technical solution for realizing the purpose of the invention is as follows: a device for testing the critical booster size of an explosive based on 3D ink-jet charging comprises a lower test board, a first upper test board and a second upper test board;
the middle part of the lower test board is provided with a wedge-shaped medicine loading groove of the lower test board, a plurality of screw grooves are uniformly distributed on the periphery of the lower test board, the higher end of the wedge-shaped medicine loading groove of the lower test board is a starting end, the lower end of the wedge-shaped medicine loading groove is a tail end, the wedge-shaped medicine loading groove of the lower test board consists of a spiral wedge-shaped groove and 1/6-5/12 equal-radius circular ring wedge-shaped grooves, the width of the spiral wedge-shaped groove from the starting end to the tail end is unchanged, the height of the spiral wedge-shaped groove is gradually reduced, and the radius of an arc is gradually increased; 1/6-5/12 equal radius arc wedge groove width is the same with the width of the spiral wedge groove, the height of the initial end is the same with the height of the spiral wedge groove end, the end height is zero;
the first upper test board is provided with crescent-shaped hole grooves for placing detonator detonating charges and screw grooves matched with the screw grooves of the lower test board;
and the second upper test board is also provided with an upper test board wedge-shaped drug loading groove compared with the first upper test board, the shape and the size of the upper test board wedge-shaped drug loading groove are the same as those of the equal-radius arc wedge-shaped groove of the lower test board, but the directions of the starting end and the tail end are opposite.
Furthermore, the outer diameter of the initial end of the spiral wedge-shaped groove is 5mm-15mm, the outer diameter of the tail end is 20mm-50mm, the number of spiral turns is 1-5, the width of the cross section of the spiral wedge-shaped groove from the initial end to the tail end is not changed to 1mm-5mm, the height of the initial end is 1mm-5mm, and the height of the tail end is 0.5mm-3 mm.
Furthermore, the outer diameter of the wedge-shaped groove of the circular ring with the equal radius of 1/6-5/12 is 25mm-100 mm.
Furthermore, the thickness of the lower test plate is 8mm-15mm, and the thickness of the first upper test plate and the second upper test plate is 5mm-10 mm.
Furthermore, the width of the crescent-shaped hole groove is 3mm-10mm, the length of the hole is 1/6-5/12 circular rings, and the first upper test board or the second upper test board and the lower test board are fixedly connected through screws.
Further, the processed material of the first upper test plate, the second upper test plate and the lower test plate was 06Cr19Ni10 stainless steel or 022Cr17Ni12Mo2 stainless steel.
A method for testing the critical booster size of the explosive by adopting the device comprises the following steps:
step (1): aiming at the explosive with the test critical booster size, explosive ink is prepared;
step (2): charging the wedge-shaped medicine charging groove of the lower test board by using a 3D ink-jet printing device and carrying out curing treatment;
and (3): assembling the lower test board and the first upper test board which finish charging, and detonating at the charging position at the beginning end of the wedge-shaped charging groove of the lower test board;
and (4): if the explosion quenching position of the wedge-shaped explosive loading groove of the lower test plate in the step (3) is in the wedge-shaped groove of the circular ring with the same radius of 1/6-5/12 of the lower test plate, performing the step (5); if the explosion quenching position of the wedge-shaped charge slot of the lower test plate in the step (3) is located in the spiral wedge-shaped slot of the lower test plate, redesigning and processing the lower test plate, increasing the height of the starting end of the wedge-shaped slot of the circular ring with equal radius of 1/6-5/12 in the lower test plate, namely the tail end of the spiral wedge-shaped slot, and repeating the steps (2) - (3) until the explosion quenching position of the wedge-shaped charge slot of the lower test plate in the step (3) is located in the wedge-shaped slot of the circular ring with equal radius of 1/6-5/12 in the lower test plate;
and (5): charging the lower test plate and the second upper test plate;
and (6): aligning the tail end of the wedge-shaped charge groove of the second upper test plate to the tail end of the equal-radius circular ring wedge-shaped groove of the lower test plate 1/6-5/12, rotating along the extending direction of the tail end of the wedge-shaped charge groove of the lower test plate until the tail end of the wedge-shaped charge groove of the second upper test plate reaches the explosion quenching position of the wedge-shaped groove of the lower test plate in the step (3), and detonating at the charge position of the start end of the spiral wedge-shaped groove in the center of the lower test plate;
and (7): if the charge of the wedge-shaped charge groove of the second upper test board in the step (6) is completely initiated, the section height of the wedge-shaped charge groove of the lower test board in the step (3) at the explosion quenching position is the critical explosion propagation height of the explosive ink, which is recorded as h1, and the critical explosion propagation size of the explosive ink can be determined to be a x h1 according to the width a of the wedge-shaped charge groove; if the charge of the wedge-shaped charge groove of the second upper test plate is not detonated in the step (6), the charge and assembly of the second upper test plate and the lower test plate are carried out again, the tail end of the wedge-shaped charge groove of the second upper test plate rotates against the extension direction of the start end and the tail end of the wedge-shaped charge groove of the lower test plate until the tail end of the wedge-shaped charge groove of the second upper test plate reaches the start end of the wedge-shaped groove of the circular ring with the same radius as that of the lower test plates 1/6-5/12, and the detonation test is carried out;
and (8): by adopting a bisection method, the complete detonation and the non-detonation of the charge of the wedge-shaped charge groove of the second upper test board are taken as judgment points, the distance between the two points corresponding to the wedge-shaped grooves of the rings with equal radii of the lower test boards 1/6-5/12 is reduced, the judgment is carried out when the distance is not more than 1mm, the cross-sectional dimension of the groove of the lower test board corresponding to the complete detonation position of the charge of the wedge-shaped charge groove of the second upper test board is recorded as a multiplied by h3, the cross-sectional dimension of the groove of the lower test board corresponding to the non-detonation position of the charge of the wedge-shaped charge groove of the second upper test board is recorded as a multiplied by h2, and according to the designed width a of the wedge-shaped groove, the critical detonation transfer dimension of the explosive ink can be determined to be a multiplied by h 3; the relative error corresponding to the critical booster thickness (h3-h2)/h2 is controlled within 5 percent by taking 1mm as a judgment cutoff basis.
Compared with the prior art, the invention has the remarkable advantages that:
the invention overcomes the defect of the critical diameter of the traditional wedge-shaped explosive loading test explosive (the measured critical diameter is generally smaller than the critical diameter of the explosive loading), firstly, the initial explosion quenching position of the explosive loading is determined through the lower test board and the first upper test board, and then the lower test board or the second test board is adopted for subsequent tests according to the explosion quenching position; then, charging and assembling the lower test plate and the second upper test plate, and finally, accurately measuring the critical booster size of the explosive by adopting a dichotomy test; the testing device is small in size, and when the judgment condition is 1mm, the error can be controlled within 5%.
Drawings
FIG. 1 is a schematic diagram of an apparatus for testing the critical booster size of an explosive according to the present invention.
FIG. 2 is a schematic view of a lower test board according to the present invention.
FIG. 3 is a schematic view of the charge morphology of the lower test plate according to the present invention.
FIG. 4 is a top view of a lower test plate of the present invention.
Fig. 5 is a sectional view taken along line a-a of fig. 4 in accordance with the present invention.
FIG. 6 is a schematic view of a first upper test board according to the present invention.
FIG. 7 is a diagram of a second upper test board according to the present invention.
FIG. 8 is a schematic view of the charge morphology of a second upper test plate according to the present invention.
FIG. 9 is a top view of a second upper test plate of the present invention.
Fig. 10 is a sectional view taken along line B-B of fig. 9 in accordance with the present invention.
FIG. 11 is a schematic diagram of an equivalent charge for error calculation according to the present invention.
Description of reference numerals:
1-lower test board, 2-upper test board, 1-1-lower test board wedge-shaped charge slot, 1-2-lower test board screw slot, 1-3-lower test board main body, 2-1-first upper test board screw slot, 2-2-first upper test board main body, 2-3-first upper test board crescent slot, 3-1-upper test board wedge-shaped charge slot, 3-2-second upper test board screw slot, 3-3-second upper test board main body, 3-4-second upper test board crescent slot, 4-1-lower charge, 5-1-upper charge.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and related drawings (fig. 1 to 11). In the drawings, parts of the structure are enlarged or reduced for clarity of explanation, and should not be regarded as strictly reflecting the proportional relationship of the geometric dimensions as a schematic diagram.
Example 1
The device for testing the critical booster size of the explosive comprises two circular steel plates with wedge-shaped grooves. As shown in fig. 1-5, the wedge-shaped groove of the lower test board is divided into two sections, the first section is a spiral wedge-shaped groove with 8mm of outer diameter at the starting end, 26mm of outer diameter at the tail end and 2 spiral turns, the cross-sectional dimension of the wedge-shaped starting end is 3mm wide and 3mm high, and the cross-sectional dimension of the tail end is 3mm wide and 0.75mm high; the starting end of the second section of wedge-shaped groove is connected with the tail end of the first section of wedge-shaped groove; the second section is an 5/12 equal-radius circular wedge-shaped groove with the same outer diameter at the beginning and the tail end, the outer diameter is 32mm, the cross section size at the beginning is 3mm wide and 0.75mm high, and the cross section size at the tail end is 3mm wide and 0mm high.
As shown in fig. 6, the first upper test board has no wedge-shaped grooves. In this example, the blast quenching position in the third step is assumed to be at the second section of the wedge shaped slot charge section of the lower test plate, so there is no need to design a new lower test plate. The design and use of the second upper test plate proceeds to the next step according to the wedge groove parameters of the lower test plate. The specification of the second upper test board wedge-shaped groove is completely consistent with that of the second section of the lower test board wedge-shaped groove, the second upper test board wedge-shaped groove is an 5/12 equal-radius circular ring wedge-shaped groove with the same outer diameter of the start end and the tail end, and only the directions of the start end and the tail end are opposite to those of the second section of the lower test board wedge-shaped groove; the outer diameter is 32mm, the cross-sectional dimension at the beginning is 3mm wide and 0.75mm high, and the cross-sectional dimension at the end is 3mm long and wide and 0mm high. The lower test plate is 8mm thick, the first upper test plate and the second upper test plate are 5mm thick and both adopt 06Cr19Ni10 stainless steel, crescent holes are reserved in the centers of the first upper test plate and the second upper test plate for placing detonator initiation charges, the width of a crescent hole ring is 5mm, and the hole length is 5/12 circular rings; the upper and lower test boards are fixed by M6 screw and nut.
The test procedure was as follows:
firstly, aiming at CL20 explosive with a test critical booster size, preparing CL20 ink, 5g of nano CL20, 0.1g of nitrocotton (the nitrogen content is more than 13 percent) and 5mL of butyl acetate, mixing, and magnetically stirring for 12 hours to finish the preparation of the CL20 explosive ink;
secondly, charging the wedge-shaped groove of the lower test board by using a 3D ink-jet printing device, and drying and curing;
thirdly, assembling the lower test board and the first upper test board which finish charging, and detonating at the charging position at the starting end of the first section of the wedge-shaped groove in the center of the lower test board;
step four, if the explosion quenching position of the wedge-shaped groove of the lower test plate in the step three is in a second section of the wedge-shaped groove of the lower test plate, the step five is carried out; if the explosion quenching position of the wedge-shaped groove of the lower test plate is positioned in the first section of wedge-shaped groove of the lower test plate in the third step, designing and processing a second lower test plate, increasing the thickness of the tail end of the second section of wedge-shaped groove in the lower test plate and the initial end of the wedge-shaped groove of the second upper test plate on the basis of the parameters of the lower test plate, and repeating the second step to the third step until the explosion quenching position of the wedge-shaped groove of the lower test plate in the third step is positioned in the second section of wedge-shaped groove of the lower test plate;
the blast location in the third step is assumed in this example to be at the second stage wedge shaped slot charge section of the lower test plate, so there is no need to redesign the lower test plate.
Fifthly, charging the lower test plate and the second upper test plate;
sixthly, aligning the tail end of the wedge-shaped groove of the second upper test plate to the tail end of the second section of wedge-shaped groove of the lower test plate, and rotating against the extension direction of the start end and the tail end of the wedge-shaped groove of the lower test plate until the tail end of the wedge-shaped groove of the second upper test plate reaches the explosion quenching position of the wedge-shaped groove of the lower test plate in the third step, and detonating at the charge position of the start end of the first section of wedge-shaped groove in the center of the lower test plate;
the seventh step, if the sixth step is the second stepAnd (3) completely detonating the explosive in the wedge-shaped groove of the test board, wherein the section thickness of the explosion quenching position of the wedge-shaped groove of the lower test board in the third step is the critical explosion propagation thickness of the explosive printing ink and is marked as h1According to the designed width (marked as a) of the wedge-shaped groove, the critical detonation size of the explosive ink can be determined to be a multiplied by h1(ii) a If the charge of the second upper test board wedge-shaped groove is not detonated in the sixth step, the second upper test board and the second lower test board are charged and assembled again, the tail end of the second upper test board wedge-shaped groove rotates along the direction opposite to the extension direction of the tail end of the lower test board wedge-shaped groove until the tail end of the second upper test board wedge-shaped groove reaches the start end of a second section of wedge-shaped groove of the lower test board, and the detonation test is carried out;
eighthly, adopting bisection, taking the complete detonation and the non-detonation of the charge of the wedge-shaped groove of the second upper test plate as a judgment point, reducing the distance between the two points corresponding to the second section of the wedge-shaped groove of the lower test plate, stopping when the distance is not more than 1mm, and recording the section size of the groove of the lower test plate corresponding to the complete detonation position of the charge of the wedge-shaped groove of the second upper test plate as a multiplied by h3And the section size of the groove of the lower test plate corresponding to the position where the charge of the wedge-shaped groove of the second upper test plate is not detonated is recorded as a multiplied by h2According to the designed width a of the wedge-shaped groove, the critical explosion propagation size of the explosive ink can be determined to be a multiplied by h3(ii) a The height of the start end of the wedge-shaped groove of the second upper test board is 0.75mm and is marked as h0The outer diameter of the annular wedge-shaped groove of the second upper test plate is 32mm, the inner diameter of the annular wedge-shaped groove of the second upper test plate is 29mm, and the radius is about 30.5mm which is recorded as the middle value when the gradient is calculatedr i As shown in FIG. 11, the critical detonation thickness [ (h) is obtained by using 1mm as the basis for determining the cutoff according to the following calculation formula3-h2)/h2]The relative error of (2.5%).
Suppose h20.5mm, the relative error
So far, the critical detonation size test of the CL20 explosive ink is completed, wherein the critical detonation size is a multiplied by h3The relative error of critical detonation propagation thickness is 2.5%.
In conclusion, the device and the method for testing the critical detonation size of the explosive based on 3D ink-jet charging can test the critical detonation size of the explosive with the critical diameter below 3mm, simultaneously improve the defect that the critical diameter of the traditional wedge-shaped explosive test explosive is insufficient (the measured critical diameter is smaller than the critical diameter of the explosive charging), can accurately measure the critical detonation size of the explosive, have small volume, and can control the error within 5% when the judgment condition is 1 mm.
Claims (7)
1. A device for testing the critical booster size of an explosive based on 3D ink-jet charging is characterized by comprising a lower test board, a first upper test board and a second upper test board;
the middle part of the lower test board is provided with a wedge-shaped medicine loading groove of the lower test board, a plurality of screw grooves are uniformly distributed on the periphery of the lower test board, the higher end of the wedge-shaped medicine loading groove of the lower test board is a starting end, the lower end of the wedge-shaped medicine loading groove is a tail end, the wedge-shaped medicine loading groove of the lower test board consists of a spiral wedge-shaped groove and 1/6-5/12 equal-radius circular ring wedge-shaped grooves, the width of the spiral wedge-shaped groove from the starting end to the tail end is unchanged, the height of the spiral wedge-shaped groove is gradually reduced, and the radius of an arc is gradually increased; 1/6-5/12 equal radius arc wedge groove width is the same with the width of the spiral wedge groove, the height of the initial end is the same with the height of the spiral wedge groove end, the end height is zero;
the first upper test board is provided with crescent-shaped hole grooves for placing detonator detonating charges and screw grooves matched with the screw grooves of the lower test board;
the test panel still is equipped with the test panel wedge loading groove on comparing with the first test panel on in the second, and the shape and the size in the test panel wedge loading groove on go up are the same with the equal radius circular arc wedge groove that tests the panel down, but the direction at top and terminal is opposite.
2. The apparatus according to claim 1, wherein the spiral wedge groove has an outer diameter of 5mm to 15mm at a start end, an outer diameter of 20mm to 50mm at a tail end, and the number of turns of the spiral is 1 to 5, and the spiral wedge groove does not become 1mm to 5mm in cross-sectional dimension from the start end to the tail end, 1mm to 5mm in height at the start end, and 0.5mm to 3mm in height at the tail end.
3. The device of claim 2, wherein the outer diameter of the wedge-shaped groove of the circular ring with the same radius of 1/6-5/12 is 25mm-100 mm.
4. The apparatus according to claim 3, wherein the lower test plate has a thickness of 8mm to 15mm, and the first upper test plate and the second upper test plate have a thickness of 5mm to 10 mm.
5. The device according to claim 4, wherein the crescent-shaped groove has a ring width of 3mm to 10mm and a hole length of 1/6 to 5/12 rings, and the first upper test plate or the second upper test plate and the lower test plate are fixed by a screw connection.
6. The apparatus according to claim 5, wherein the processed material of the first upper test plate, the second upper test plate and the lower test plate is 06Cr19Ni10 stainless steel or 022Cr17Ni12Mo2 stainless steel.
7. A method of testing the critical booster size of an explosive using the apparatus of any one of claims 1 to 6, comprising the steps of:
step (1): preparing explosive ink aiming at the explosive with the critical booster size to be tested;
step (2): charging the wedge-shaped medicine charging groove of the lower test plate by using a 3D ink-jet printing device and carrying out curing treatment;
and (3): assembling the lower test board and the first upper test board which are subjected to charging, and detonating at the starting end of the wedge-shaped charging groove of the lower test board;
and (4): if the explosion quenching position of the wedge-shaped explosive loading groove of the lower test plate in the step (3) is in the wedge-shaped groove of the circular ring with the same radius of 1/6-5/12 of the lower test plate, performing the step (5); if the explosion quenching position of the wedge-shaped charge slot of the lower test board in the step (3) is located in the spiral wedge-shaped slot of the lower test board, redesigning and processing the lower test board, increasing the height of the starting end of the 1/6-5/12 equal-radius circular ring wedge-shaped slot in the lower test board, namely the height of the tail end of the spiral wedge-shaped slot, and repeating the steps (2) - (3) until the explosion quenching position of the wedge-shaped charge slot of the lower test board in the step (3) is located in the 1/6-5/12 equal-radius circular ring wedge-shaped slot of the lower test board;
and (5): charging the lower test plate and the second upper test plate;
and (6): aligning the tail end of the wedge-shaped charge groove of the second upper test plate to the tail end of the equal-radius circular ring wedge-shaped groove of the lower test plate 1/6-5/12, rotating along the extending direction of the tail end of the wedge-shaped charge groove of the lower test plate until the tail end of the wedge-shaped charge groove of the second upper test plate reaches the explosion quenching position of the wedge-shaped groove of the lower test plate in the step (3), and detonating at the charge position of the start end of the spiral wedge-shaped groove in the center of the lower test plate;
and (7): if the charge of the wedge-shaped charge groove of the second upper test board in the step (6) is completely initiated, the section height of the wedge-shaped charge groove of the lower test board in the step (3) at the explosion quenching position is the critical explosion propagation height of the explosive ink, which is recorded as h1, and the critical explosion propagation size of the explosive ink can be determined to be a x h1 according to the width a of the wedge-shaped charge groove; if the charge of the wedge-shaped charge groove of the second upper test plate is not detonated in the step (6), the charge and assembly of the second upper test plate and the lower test plate are carried out again, the tail end of the wedge-shaped charge groove of the second upper test plate rotates against the extension direction of the start end and the tail end of the wedge-shaped charge groove of the lower test plate until the tail end of the wedge-shaped charge groove of the second upper test plate reaches the start end of the wedge-shaped groove of the circular ring with the same radius as that of the lower test plates 1/6-5/12, and the detonation test is carried out;
and (8): by adopting a bisection method, the complete detonation and the non-detonation of the charge of the wedge-shaped charge groove of the second upper test board are taken as judgment points, the distance between the two points corresponding to the wedge-shaped grooves of the rings with equal radii of the lower test boards 1/6-5/12 is reduced, the judgment is carried out when the distance is not more than 1mm, the cross-sectional dimension of the groove of the lower test board corresponding to the complete detonation position of the charge of the wedge-shaped charge groove of the second upper test board is recorded as a multiplied by h3, the cross-sectional dimension of the groove of the lower test board corresponding to the non-detonation position of the charge of the wedge-shaped charge groove of the second upper test board is recorded as a multiplied by h2, and according to the designed width a of the wedge-shaped groove, the critical detonation transfer dimension of the explosive ink can be determined to be a multiplied by h 3; the relative error corresponding to the critical booster thickness (h3-h2)/h2 is controlled within 5 percent by taking 1mm as a judgment cutoff basis.
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