CN112284599A - Acceptance device and method for quantifying output power of flexible detonating cord - Google Patents
Acceptance device and method for quantifying output power of flexible detonating cord Download PDFInfo
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- CN112284599A CN112284599A CN202010897730.1A CN202010897730A CN112284599A CN 112284599 A CN112284599 A CN 112284599A CN 202010897730 A CN202010897730 A CN 202010897730A CN 112284599 A CN112284599 A CN 112284599A
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- test piece
- detonating cord
- copper column
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- column test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/14—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force of explosions; for measuring the energy of projectiles
Abstract
The invention relates to a device and a method for checking and accepting output power of a quantized flexible detonating cord, wherein the device comprises a copper column test piece, a buffer base, a metal cylinder, a buffer plug and a metal plug cover; the copper column test piece is of a cylindrical structure with a through hole in the center, and the through hole is used for penetrating through the flexible detonating cord; the buffer base is of a cylindrical structure, at least four stepped holes are uniformly distributed in the structure in the circumferential direction, a large stepped hole in each stepped hole is used for mounting a copper column test piece, and the position of each small stepped hole is consistent with that of a through hole of the mounted copper column test piece; a buffer plug with a central through hole is arranged on the stepped large hole end surface of the buffer base, a metal cylinder is sleeved outside the buffer base and the buffer plug, and metal plugs are arranged on two sides of the metal cylinder; the metal blocking cover is provided with through holes with the same number as the stepped holes of the buffer base, and the through holes are used for penetrating through the flexible detonating cord; and the input end of the flexible detonating cord is provided with a detonator.
Description
Technical Field
The invention relates to an acceptance device which is suitable for quantifying the output power of a flexible detonating cord.
Background
The flexible detonating cord is mainly used for linear cutting separation of parts such as a bullet (arrow) fairing, a stage section, an end repair cabin and the like, and is also mainly used for rupture separation of a canopy on an airplane. The flexible detonating cord has the advantages of good installation performance, strong adaptability, good output consistency and the like, and is widely applied in the field of aerospace. The output power of the traditional flexible detonating cord affects the separation effect of a final projectile (arrow) system, a metal plate with a certain thickness is generally separated to be used as a basis for judging whether the flexible detonating cord is qualified, and the method can only judge the lower limit of the output power of the flexible detonating cord, can only judge qualitatively and cannot give out a specific lower limit of the output power.
The Chinese patent 201410539154.8 discloses a margin test assessment method for a flexible detonating cord separation device, which comprises a separation ring, a flexible detonating cord, a protective cover, a fastener, an upper end frame and a lower end frame. When the flexible detonating cord works, detonation energy is output along the radial direction to separate the weakened groove part of the separating ring, so that the separation performance margin and the structural strength margin of the flexible detonating cord are verified. The separation device can only quantitatively estimate the output energy of the flexible detonating cord, and can smoothly separate the separation rings when the loading of the flexible detonating cord is 67-120% under the condition that the structural strength of the device is met, so that the device cannot qualitatively quantify the output power of the flexible detonating cord.
The Chinese patent 201410526247.7 discloses a design and identification test method for a flexible detonating cord separation device, which adopts a method of combining a 1:1 test piece and a flat test piece to carry out design and identification tests. After the separation device is subjected to various environmental conditions in the flight process of the aerospace craft, high-temperature, low-temperature and normal-temperature ignition tests are carried out, and after the tests, the flexible detonating cord smoothly separates the separation device, so that the normal work of the flexible detonating cord can be judged. Because the output power of the flexible detonating cord is influenced to a certain extent when the flexible detonating cord is subjected to various environments, the judging method of the separating device cannot quantify the influence degree of the output power of the flexible detonating cord.
The above patent is limited by the device structure, and the output power of the flexible detonating cord cannot be quantified qualitatively, and the following defects exist:
(1) the lower limit index of the output power of the flexible detonating cord is inaccurate, the acceptance index of the traditional separation device is generally used for separating a metal plate with a certain fixed thickness, and the minimum thickness of the metal plate which can be separated by the flexible detonating cord is different when the output power of the flexible detonating cord is larger or smaller. If the metal plates with the same thickness are adopted for acceptance check, the output power of the metal plates cannot be measured, if the metal plates with different thicknesses are adopted for acceptance check, the acceptance number is greatly increased, and different separation technical states of the same product are not allowed in many fields (such as the aerospace field);
(2) the upper limit index of the output power of the flexible detonating cord cannot be determined, as long as the output power of the flexible detonating cord reaches a critical point, the metal plate can be reliably separated no matter how much the dosage is increased, and no index for specifically measuring the upper limit of the output power of the flexible detonating cord exists;
with the development of aerospace technology, the requirement on the consistency of the output power of the flexible detonating cord is higher and higher. Too little output power cannot meet the separation requirement of the system, and too much output power causes too much impact on the surrounding structure, which is not allowed. The traditional flexible detonating cord acceptance device is not suitable for the development requirement of the refined design of the current flexible detonating cord.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects in the prior art are overcome, and the acceptance device capable of quantifying the output power of the flexible detonating cord is provided.
The technical scheme of the invention is as follows: a checking and accepting device for quantifying the output power of a flexible detonating cord comprises a copper column test piece, a buffer base, a metal cylinder, a buffer plug and a metal plug cover;
the copper column test piece is of a cylindrical structure with a through hole in the center, and the through hole is used for penetrating through the flexible detonating cord; the buffer base is of a cylindrical structure, at least four stepped holes are uniformly distributed in the structure in the circumferential direction, a large stepped hole in each stepped hole is used for mounting a copper column test piece, and the position of each small stepped hole is consistent with that of a through hole of the mounted copper column test piece; a buffer plug with a central through hole is arranged on the stepped large hole end surface of the buffer base, a metal cylinder is sleeved outside the buffer base and the buffer plug, and metal plugs are arranged on two sides of the metal cylinder; the metal blocking cover is provided with through holes with the same number as the stepped holes of the buffer base, and the through holes are used for penetrating through the flexible detonating cord; and the input end of the flexible detonating cord is provided with a detonator.
Preferably, the clearance between the flexible detonating cord and the central through hole of the copper column test piece is less than or equal to 0.2mm, and the clearance between the flexible detonating cord and the small stepped hole of the buffer base is less than or equal to 0.2 mm.
Preferably, the buffering base and the buffering plug are made of flexible materials.
Preferably, the number of the stepped large holes of the buffer base for mounting the copper column test piece is more than or equal to 4.
Preferably, the copper column test piece material for measuring the output power of the flexible detonating cord is red copper, and the fracture elongation is more than or equal to 50%.
Preferably, the length of the copper column test piece for measuring the output power of the flexible detonating cord is (50-100) mm.
Preferably, the buffering base and the buffering plug are in a relative moving state, the axial moving clearance range is (0-25) mm, and the radial moving range is (0-2) mm.
Preferably, the clearance between the copper column test piece and the stepped large hole of the buffer base is (1-5) mm.
Preferably, the minimum wall thickness between the adjacent stepped large holes of the buffer base is more than or equal to 10 mm.
A checking and accepting method for quantifying output power of a flexible detonating cord is realized by the following modes:
measuring the inner diameter and the outer diameter of the copper column test piece;
mounting the structural relation to complete the mounting of the flexible detonating cord, and introducing current into the detonator for testing;
and taking out the copper column test piece after the test, measuring the inner diameter and outer diameter values of the copper column test piece after cleaning residues on the inner surface and the outer surface, calculating the inner diameter and outer diameter variation, and quantifying the output power of the flexible detonating cord according to the variation.
Preferably, after the test, measuring the inner diameter and the outer diameter of the measuring area of the copper column test piece; the measuring area is an area except for two side edge effect areas, and the two side edge effect areas are not less than 20% of the length of the whole copper column test piece.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts the inner and outer diameter variation values before and after the test of the copper column test piece as reference indexes, and can quantify the output power of the flexible detonating cord with different dosages. Compared with the existing flexible detonating cord separation acceptance device, the device can accurately give the upper limit value and the lower limit value of the output power of the flexible detonating cord under a certain dosage, and the acceptance index is quantized.
(2) The acceptance check device has the advantages that part of components of the acceptance check device are made of flexible materials, the structure is simple, the processing and the assembly are easy, the components of the traditional flexible detonating cord separating device are complex in structure, large in mass, large in processing difficulty and high in production cost, and compared with the acceptance check device, the weight is reduced by 80%, and the cost is reduced by 75%.
(3) The flexible detonating cord separation device can simultaneously check and accept more than 4 flexible detonating cords, and greatly improves the checking and accepting efficiency compared with the traditional flexible detonating cord separation device which can only check and accept 1 or 2 flexible detonating cords simultaneously.
Drawings
FIG. 1 is a radial cross-sectional view taken at the midpoint of the present invention;
FIG. 2 is a cross-sectional view of the present invention taken axially along the centerline;
FIG. 3 is a schematic view of a buffer base according to the present invention;
FIG. 4 is a schematic view of a buffer plug according to the present invention;
FIG. 5 is a schematic view of a copper cylinder test piece according to the present invention;
fig. 6 is a schematic view of the metal cap of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
As shown in fig. 1, 2, 3, 4 and 6, the acceptance device for quantifying the output power of the flexible detonating cord comprises a flexible detonating cord 1, a copper column test piece 2, a buffer base 3, a metal cylinder 4, a buffer plug 5, a metal plug cover 6 and a detonator 7, wherein the buffer base 3 structurally comprises a copper column test piece mounting hole 8 and a flexible detonating cord mounting hole 9, the buffer plug 5 structurally comprises an input end mounting hole 10, the copper column test piece 2 structurally comprises an edge effect area 11 and a measurement area 12, and the metal plug cover 6 structurally comprises a plug cover mounting hole 13. The flexible detonating cord 1 penetrates through a central hole of the copper column test piece 2, the flexible detonating cord 1 and the copper column test piece 2 are placed in a copper column test piece mounting hole 8 of the buffer base 3 together, and the flexible detonating cord 1 penetrates out through a flexible detonating cord mounting hole 9 at the bottom of the buffer base 3; sequentially installing four copper column test pieces 2 with flexible detonating cords 1 in a buffer base 3, enabling the flexible detonating cords 1 to penetrate into flexible detonating cord installation holes 9 at the bottom of the buffer base 3 and extend out for a certain distance, sequentially penetrating the other ends of the four flexible detonating cords 1 into four round holes of a buffer plug 5, and putting the flexible detonating cords 1, the copper column test pieces 2, the buffer base 3 and the buffer plug 5 into a metal cylinder 4; two ends of the four flexible detonating cords 1 respectively penetrate through the plug mounting holes 13 of the metal plugs 6, the two ends respectively extend out of the metal plugs 6 by about 50mm, and the four detonators 7 are bonded on the input ends of the flexible detonating cords 1 through adhesive tapes.
The inner diameter and the outer diameter of the copper column test piece 2 are measured before the test, a certain current is introduced into the detonator 7 during the test, the flexible detonating cord 1 outputs detonation energy when working, the detonation energy acts on the inner surface of the copper column test piece 2, the copper column test piece 2 deforms greatly along the radial direction due to the fact that the gap between the flexible detonating cord 1 and the copper column test piece 2 is small (not more than 0.2mm), the buffering base 3 and the buffering plug 5 are made of flexible materials, the buffering effect is strong, the copper column test piece 2 cannot collide with surrounding metal structures to deform in the working process of the flexible detonating cord 1, and therefore the inner diameter and the outer diameter change are obvious and even.
As shown in fig. 5, the copper cylinder test piece 2 is taken out after the test, the inner diameter and the outer diameter of the copper cylinder test piece 2 are measured after the residues on the inner surface and the outer surface are cleaned, and the variation of the inner diameter and the outer diameter is calculated. The structure of the copper column test piece 2 after the test is divided into three parts, wherein the length of each 20% of the front part and the rear part is an edge effect area 11, the length of the middle part is 60% of the length of the middle part is a measurement area 12, and the measurement area 12 is selected for measurement during measurement. The larger the dosage is, the larger the output power of the flexible detonating cord 1 is, the more obvious the change values of the inner diameter and the outer diameter are, and the output power of the flexible detonating cord 1 can be quantified through the change values of the inner diameter and the outer diameter.
The clearance between the flexible detonating cord and the central through hole of the copper column test piece is less than or equal to 0.2mm, and the clearance between the flexible detonating cord and the small stepped hole of the buffer base is less than or equal to 0.2mm, so that the detonation energy attenuation is slowed down; the buffer base and the buffer plug are made of flexible materials. The number of the stepped large holes of the buffer base for mounting the copper column test piece is more than or equal to 4, and more than 4 flexible detonating cords are simultaneously checked and accepted. In order to meet the requirements of a forming process and measurement, the copper column test piece for measuring the output power of the flexible detonating cord is made of red copper, the fracture elongation is more than or equal to 50%, and the length is (50-100) mm. The buffer base and the buffer plugging cover are in a relative moving state, the range of the axial moving clearance is (0-25) mm, and the range of the radial moving clearance is (0-2) mm, so that the buffer base and the buffer plugging cover play a role in buffering and restrain the radial displacement of the copper column test piece. The gap between the copper column test piece and the stepped large hole of the buffer base is (1-5) mm so as to restrain the radial displacement of the flexible detonating cord. The minimum wall thickness between adjacent stepped large holes of the buffer base is more than or equal to 10mm, so that the buffer base is prevented from being cracked.
As shown in fig. 1 and 2, the buffer base 3 and the buffer plug 5 mainly function to relieve the explosion impact generated during the operation of the flexible detonating cord 1, so as to prevent the copper column test piece 2 from cracking due to collision, and the metal cylinder 4 and the metal plug 6 mainly function as a fixing part, so that the buffer base 3, the metal cylinder 4, the buffer plug 5 and the metal plug 6 can be reused. According to the invention, each set of parts has the weight of less than or equal to 1kg, most parts can be reused, the weight of the disposable parts is less than or equal to 0.2kg, and the number of the holes of the buffer base 3, the buffer plug 5 and the metal plug cover 6 can be increased properly when the number of the parts is large.
The present invention is not disclosed in the technical field of the common general knowledge of the technicians in this field.
Claims (11)
1. The utility model provides a device of accepting of output power of flexible explosion-proof cable of quantification which characterized in that: the device comprises a copper column test piece, a buffer base, a metal cylinder, a buffer plug and a metal plug cover;
the copper column test piece is of a cylindrical structure with a through hole in the center, and the through hole is used for penetrating through the flexible detonating cord; the buffer base is of a cylindrical structure, at least four stepped holes are uniformly distributed in the structure in the circumferential direction, a large stepped hole in each stepped hole is used for mounting a copper column test piece, and the position of each small stepped hole is consistent with that of a through hole of the mounted copper column test piece; a buffer plug with a central through hole is arranged on the stepped large hole end surface of the buffer base, a metal cylinder is sleeved outside the buffer base and the buffer plug, and metal plugs are arranged on two sides of the metal cylinder; the metal blocking cover is provided with through holes with the same number as the stepped holes of the buffer base, and the through holes are used for penetrating through the flexible detonating cord; and the input end of the flexible detonating cord is provided with a detonator.
2. The acceptance device of claim 1, wherein: the clearance between the flexible detonating cord and the central through hole of the copper column test piece is less than or equal to 0.2mm, and the clearance between the flexible detonating cord and the small stepped hole of the buffer base is less than or equal to 0.2 mm.
3. The acceptance device of claim 1, wherein: the buffer base and the buffer plug are made of flexible materials.
4. The acceptance device of claim 1, wherein: the number of the stepped large holes of the buffer base for mounting the copper column test piece is more than or equal to 4.
5. The acceptance device of claim 1, wherein: the copper column test piece for measuring the output power of the flexible detonating cord is made of red copper, and the fracture elongation is more than or equal to 50%.
6. The acceptance device of claim 1, wherein: the length of the copper column test piece for measuring the output power of the flexible detonating cord is 50-100 mm.
7. The acceptance device of claim 1, wherein: the buffer base and the buffer plug are in relative movement state, the range of axial movement clearance is (0-25) mm, and the range of radial movement is (0-2) mm.
8. The acceptance device of claim 1, wherein: the gap between the copper column test piece and the stepped large hole of the buffer base is (1-5) mm.
9. The acceptance device of claim 1, wherein: the minimum wall thickness between adjacent stepped large holes of the buffer base is more than or equal to 10 mm.
10. A checking and accepting method for quantifying output power of a flexible detonating cord is characterized by being realized in the following way:
measuring the inner diameter and the outer diameter of the copper column test piece;
installing the structural relationship as set forth in claim 1 to complete installation of the flexible detonating cord and conducting a test by passing current through the detonator;
and taking out the copper column test piece after the test, measuring the inner diameter and outer diameter values of the copper column test piece after cleaning residues on the inner surface and the outer surface, calculating the inner diameter and outer diameter variation, and quantifying the output power of the flexible detonating cord according to the variation.
11. The acceptance method according to claim 9, wherein: measuring the inner diameter and the outer diameter of a measuring area of the copper cylinder test piece after the test; the measuring area is an area except for two side edge effect areas, and the two side edge effect areas are not less than 20% of the length of the whole copper column test piece.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115655770A (en) * | 2022-12-12 | 2023-01-31 | 四川航天川南火工技术有限公司 | Quantifiable energy-gathering cutting cable separation performance acceptance device and method |
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