Processing Method of Release Device for Drop Test and Release Device

Abstract

The present invention discloses a processing method for a release device used in a drop test and a release device. The processing method for the release device includes: a material selection step: selecting a target steel rod with a first diameter after matching the weight and safety factor of the test product with the maximum lifting weight; a processing and forming step: processing the target steel rod to form an S-shaped hook mechanism, determining the detonation point according to the overall height of the hook mechanism, and opening a through hole with a second diameter at the detonation point; a charge processing and installation step: processing a detonating charge according to the second diameter and the first diameter, and filling the charge into the through hole; a barrier processing and installation step: determining the size of the barrier according to the thickness of the partition, the position of the detonation point, and the length of the test product, and then processing the barrier according to the size of the barrier and installing it on the hook mechanism; a detonator installation step: installing the detonator on the charge, and detonating the charge through the detonator to cut off the hook mechanism so as to release the test product.

Description

Technical Field

[0001] The present invention relates to the technical field of drop test, and particularly relates to a processing method for a release device for drop test and a release device. Background Art

[0002] During the general assembly and transportation of large torpedo warheads, warhead sections and missile weapon systems, there is a risk of accidental ignition. The safety of accidental dropping has become an important safety performance index required by the military for weaponry. Factories need to conduct drop tests during the research and production of large torpedo warheads and missile warheads to provide a basis for the assessment of their safety levels, thereby reducing the research risks of products.

[0003] Large torpedo warheads, warhead sections and missile warheads weigh from 0.05T to 2T. It is necessary to require that the release mechanism should be able to reliably carry heavy objects, ensure that the release mechanism can reliably lift the test product, and realize the dropping of the product in different postures such as horizontal and vertical. At the same time, considering the instantaneous release, it is ensured that the release process does not affect the test product.

[0004] Due to the risk of explosion after the large torpedo warhead, warhead section and missile weapon system fall, it is required that the drop release device has remote control and can carry a large load. At present, the traditional electromagnetic drop test release device mainly consists of a bracket and a push-pull electromagnet. The push rod of the push-pull electromagnet not only plays the role of pulling out and releasing the sample but also plays the role of carrying the sample. When the weight of the carried sample is too large and the generated frictional force is greater than the suction force of the push-pull electromagnet, the push rod of the push-pull electromagnet will lose the pulling-out function, and the stability of the test is poor. At the same time, the existing release device can only realize the horizontal dropping of large products, but cannot meet the vertical dropping of large torpedo warheads, warhead sections and missile weapon systems, nor is it applicable to the dropping of special-shaped test products and test products with packaging boxes and other situations, and the applicable range is narrow.

[0005] Therefore, it is urgent to develop a processing method for a release device for drop test and a release device that overcome the above defects. Summary of the Invention

[0006] In view of the above problems, the present invention provides a processing method for a release device for drop test, which includes:

[0007] Material selection step: Obtain the maximum lifting weight of multiple steel bars, and after matching the weight and safety factor of the test product with the maximum lifting weight, select a target steel bar with a first diameter from the multiple steel bars;

[0008] Processing and forming step: Process the target steel bar to form an S-shaped hook mechanism, determine the initiation point according to the overall height of the hook mechanism, and open a through hole with a second diameter at the initiation point;

[0009] Processing and installing step of the explosive charge: Process the initiating explosive charge according to the second diameter and the first diameter, and fill the explosive charge into the through hole;

[0010] Processing and installing step of the barrier: After determining the size of the barrier according to the thickness of the partition, the position of the initiation point, and the length of the test product, process the barrier according to the size of the barrier and install the barrier on the hook mechanism;

[0011] Installing step of the detonator: Install the detonator on the explosive charge, and detonate the explosive charge through the detonator to cut off the hook mechanism so as to release the test product.

[0012] The above processing method of the release device, wherein the material selection step includes:

[0013] Determine the safe lifting weight of each steel bar according to the maximum lifting weight and the safety factor;

[0014] After matching the safe lifting weight with the weight of the test product, select the target steel bar from a variety of steel bars.

[0015] The above processing method of the release device, wherein the material selection step further includes:

[0016] Obtain the cross-sectional area at the through hole and the yield strength of the target steel bar, calculate the maximum lifting force of the hook mechanism according to the cross-sectional area at the through hole and the yield strength of the target steel bar, and verify the target steel bar after matching the maximum lifting force with the weight of the test product.

[0017] The above processing method of the release device, wherein the processing and forming step includes:

[0018] Process the target steel bar to form two bent portions at both ends and a connecting portion connecting the two bent portions. One bent portion is hung on a drop frame, and the test product is hung on the other bent portion through a sling;

[0019] Determine the position of the initiation point on the connecting portion according to the distance between the vertices of the two bent portions;

[0020] Open the through hole at the position of the initiation point on the connecting portion.

[0021] The above method for processing the release device, wherein the steps of processing and installing the explosive charge include:

[0022] Obtain the maximum shear strength of the hook mechanism according to the cross-sectional area at the through hole and the shear strength of the target steel bar;

[0023] Determine the amount of explosive charge of the explosive charge according to the second diameter and the first diameter;

[0024] Determine the TNT equivalent according to the amount of explosive charge of the explosive charge and the density of the explosive charge;

[0025] Determine the shock wave overpressure of the explosive charge according to the TNT equivalent and the radius of the explosive charge;

[0026] When the shock wave overpressure is greater than or equal to the maximum shear strength, the explosive charge is processed according to the second diameter and the first diameter and filled into the through hole; when the shock wave overpressure is less than the maximum shear strength, return to the processing and forming step, expand the aperture of the through hole, and then repeat the steps of processing and installing the explosive charge according to the adjusted second diameter.

[0027] The above method for processing the release device, wherein the steps of processing and installing the explosive charge further include:

[0028] When filling the explosive charge, the two end faces of the explosive charge are flush with the outer side surface of the connecting portion.

[0029] The above method for processing the release device, wherein the steps of processing and installing the barrier member include:

[0030] Obtain the length of the test product after hoisting;

[0031] Determine a first distance according to the thickness of the partition plate and the position of the initiation point;

[0032] Determine a second distance according to the position of the initiation point and the position of the suspension point of the test product after hoisting;

[0033] Determine the diameter of the partition plate according to the length of the test product, the first distance and the second distance, and process the barrier member according to the diameter of the partition plate;

[0034] Install the barrier member on the bent portion located below.

[0035] The above method for processing the release device, wherein the step of installing the detonating member:

[0036] Install two detonating members on the two end faces of the explosive charge respectively.

[0037] The above-mentioned processing method of the release device, wherein the initial second diameter is 20 mm.

[0038] The present invention also provides a release device for a drop test, which includes:

[0039] An S-shaped hook mechanism, which includes two bent portions at both ends and a connecting portion connecting the two bent portions. One of the bent portions is hung on a drop rack, and the test product is hung on the other bent portion through a sling. A through hole serving as an initiation point is opened on the connecting portion;

[0040] A charge, which is filled in the through hole, and the two end faces of the charge are flush with the outer side surface of the connecting portion;

[0041] A barrier member, which is installed on the other bent portion to protect the test product from being affected by fragments;

[0042] Two detonating members, which are respectively installed on the two end faces of the charge;

[0043] Wherein, the charge is detonated by the detonating member to cut off the hook mechanism, thereby instantaneously releasing the test product and realizing the drop of the test product.

[0044] The efficacy of the present invention relative to the prior art lies in that: the present invention provides a drop test release device and its processing method with a wide application range, high stability and simple structure. An S-shaped hook is processed from materials with different diameters and materials according to the weight of the drop test piece, a hole is drilled in the middle of the S-shaped hook, and then a remotely controllable detonating member and a charge are installed at the drilled position. The hook is cut off by the energy of the explosion to achieve instantaneous release. A barrier member is arranged near the explosion device to prevent the explosion from damaging the test product and affecting the test accuracy. In order to ensure the stability of the release device, a multi-point initiation method is adopted. During the test, a charge with a corresponding energy is matched according to the material and diameter of the hook, etc., so as to ensure the stability of the release device. The present invention has no requirements on the state of the drop test piece, and it can be hung on the hook after being adjusted arbitrarily, with a wide application range.

[0045] Other features and advantages of the present invention will be described in the following specification, and, in part, will become apparent from the specification or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification, claims and drawings. Description of the Drawings

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0047] Figure 1 It is a flowchart of the processing method of the release device of the present invention;

[0048] Figure 2 It is a schematic structural diagram of the release device of the present invention;

[0049] Figure 3 It is a sectional view of the through-hole position;

[0050] Figure 4 It is a schematic diagram of the state of horizontal drop;

[0051] Figure 5 It is a schematic diagram of the state of vertical drop. Specific embodiments

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0053] The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not limit the present invention. Additionally, the same or similar reference numerals of elements / components used in the drawings and embodiments are used to represent the same or similar parts.

[0054] Regarding the "first", "second", "S1", "S2", etc. used in this article, they do not particularly refer to the meaning of order or sequence, nor are they used to limit the present invention. They are only used to distinguish elements or operations described with the same technical terms.

[0055] Regarding the directional terms used in this article, such as up, down, left, right, front, or back, etc., they are only references to the directions in the drawings. Therefore, the directional terms used are for illustration and not for limiting this creation.

[0056] Regarding the "including", "comprising", "having", "containing", etc. used in this article, they are all open-ended terms, that is, they mean including but not limited to.

[0057] As used herein, "and / or" includes any and all combinations of the recited elements.

[0058] As used herein, "a plurality of" includes "two" and "more than two"; "a plurality of groups" includes "two groups" and "more than two groups".

[0059] Certain terms used to describe the present application will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of the present application.

[0060] Please refer to Figure 1 - Figure 2 , Figure 1 , which is a flowchart of the processing method of the release device of the present invention; Figure 2 , which is a schematic structural diagram of the release device of the present invention. As Figure 1 - Figure 2 shown, a processing method of a release device for a drop test according to the present invention includes:

[0061] Material selection step S1: Obtain the maximum lifting weight of a plurality of steel bars, and after matching the weight and safety factor of the test product with the maximum lifting weight, select a target steel bar with a first diameter from the plurality of steel bars;

[0062] Processing and forming step S2: Process the target steel bar to form an S-shaped hook mechanism, determine the initiation point according to the overall height of the hook mechanism, and open a through hole with a second diameter at the initiation point;

[0063] Charge processing and installation step S3: Process the initiation charge according to the second diameter and the first diameter, and fill the charge into the through hole;

[0064] Barrier member processing and installation step S4: After determining the size of the barrier member according to the thickness of the partition, the position of the initiation point, and the length of the test product, process the barrier member according to the size of the barrier member, and install the barrier member on the hook mechanism;

[0065] Initiator installation step S5: Install the initiator on the charge, and detonate the charge through the initiator to cut off the hook mechanism to release the test product. It should be noted that the second diameter is smaller than the first diameter.

[0066] Among them, the material selection step S1 includes:

[0067] Determine the safe lifting weight of each steel bar according to the maximum lifting weight and the safety factor; after matching the safe lifting weight with the weight of the test product, select the target steel bar from the plurality of steel bars.

[0068] Specifically, in this step, the performance indexes of steel bars of different materials are obtained first, as shown in the following table:

[0069] Table 1 Lifting weight of S-shaped hook

[0070] Material 45 Steel 20 Steel Q235 2A12 5A06 Yield Strength / Mpa 355 245 235 325 160 Maximum Lifting Weight / kg 5498 3794 3639 5033 2478 Safe Lifting Weight / kg 2749 1897 1819.5 2516.5 1239

[0071] The safe lifting weight is determined according to the maximum lifting weight and safety factor of the steel bar of each material. For example, the maximum lifting weight of 45 steel is 5498 and the safety factor is 0.5, then the safe lifting weight of 45 steel is 2749. It should be noted that the safety factor is to ensure the safety of the test. In this embodiment, it is a preferred implementation to set the safety factor to 0.5. Obtain the weight of the test product, and select the steel bar whose safe lifting weight is close to and greater than the weight of the test product as the target steel bar.

[0072] Among them, the processing and forming step S2 includes:

[0073] The target steel bar is processed to form two bending parts 21 at both ends and a connecting part 22 connecting the two bending parts. One bending part 21 is hung on a dropping frame 1, and the test product 4 is hung on the other bending part 21 through a sling 3;

[0074] Determine the position of the initiation point P2 on the connecting part 22 according to the distance between the vertices P1 of the two bending parts 21;

[0075] Open the through hole K at the position of the initiation point P2 on the connecting part 22.

[0076] Specifically, connect the two vertices P1 with a line L1. The line L1 intersects the connecting part 22. Set the midpoint of the line L1 as the initiation point P2. The initiation point P2 is located on the connecting part 22, and open the through hole K at the position of the initiation point P2.

[0077] Please refer to Figure 3 , Figure 3 for the sectional view of the through hole position. As Figure 3 shown, the material selection step S1 further includes:

[0078] Obtain the sectional areas S1, S2 at the through hole K and the yield strength of the target steel bar. Calculate the maximum lifting force F1 of the hook mechanism according to the sectional areas S1, S2 at the through hole K and the yield strength of the target steel bar. After matching the maximum lifting force F1 with the weight of the test product, verify the selection of the target steel bar.

[0079] For example, the target steel bar is a No. 45 steel bar with a first diameter φ1 of 30 mm. The yield strength σs of No. 45 steel is 355 MPa. A through hole K with an initial second diameter φ2 of 20 mm is drilled at the position of the initiation point P2. The drilling position is the position with the lowest strength of the release device. The cross-sectional area of the through hole K is S = S1 + S2. According to the formula: F1 = σs × S, the maximum lifting force F1 is calculated. The maximum lifting force F1 is matched and verified with the weight of the test product. When the maximum lifting force F1 is greater than or equal to the weight of the test product, the test requirements are met. When the maximum lifting force F1 is less than the weight of the test product, the material is selected again.

[0080] Among them, the processing and installation step S3 of the explosive column includes:

[0081] The maximum shear strength Fk of the hook mechanism is obtained according to the cross-sectional area S at the through hole K and the shear strength σc of the target steel bar;

[0082] The amount of the explosive column 23 is determined according to the second diameter φ2 and the first diameter φ1;

[0083] The TNT equivalent m is determined according to the amount of the explosive column 23 and the density of the explosive column 23;

[0084] The shock wave overpressure P of the explosive column is determined according to the TNT equivalent m and the radius r of the explosive column;

[0085] When the shock wave overpressure P is greater than or equal to the maximum shear strength Fk, the explosive column 23 is processed according to the second diameter φ2 and the first diameter φ1 and filled into the through hole K. When filling the explosive column, the two end faces 231 and 232 of the explosive column 23 are flush with the outer side face 221 of the connecting part 22; when the shock wave overpressure P is less than the maximum shear strength Fk, return to the processing and forming step S2. After enlarging the aperture of the through hole K, repeat the processing and installation step S3 of the explosive column according to the adjusted second diameter φ2 until the test requirements are met.

[0086] For example, the shear strength σc of 45 steel is 178 MPa. According to the formula Fk = σc × S / 2, the maximum shear strength Fk of the hook mechanism is calculated to be 13783 MPa; the explosive column is selected as JO-8. The diameter of the explosive column is the initial second diameter φ2, which is 20 mm, and the length of the explosive column is the first diameter φ1, which is 30 mm. The volume of the explosive column is calculated according to the diameter and length of the explosive column, and then multiplied by the density of the explosive column to obtain the amount of the explosive column. The TNT equivalent m is obtained by multiplying the amount of the explosive column by a preset proportional coefficient. In the present invention, it is preferably an embodiment with a proportional coefficient of 1.5; thus, according to the formula P = 0.679m / r 3+0.1013, it is calculated that the shock wave overpressure P of the booster charge is 16975.1013 MPa. The shock wave overpressure P is greater than the maximum shear strength Fk of 45 steel, which can ensure the smooth separation of the S-shaped hook mechanism.

[0087] Among them, in this embodiment, the density of the charge is 1.81 - 1.82.

[0088] It should be noted that since the shear strengths of other materials in the above table are all lower than that of 45 steel, charges with the same diameter can be used.

[0089] Among them, the processing and installation steps S4 of the barrier include:

[0090] Obtain the length M1 of the test product 4 after hoisting;

[0091] Determine the first distance N1 according to the thickness H of the partition and the position of the initiation point P2;

[0092] Determine the second distance N2 according to the position of the initiation point P2 and the position of the suspension point P3 of the test product 4 after hoisting;

[0093] Determine the diameter M2 of the partition according to the length M1 of the test product, the first distance N1 and the second distance N2, and process the barrier 24 according to the diameter M2 of the partition;

[0094] Install the barrier 24 on the lower bending part 21.

[0095] For example, during the explosion, fragments will be formed near the position of the initiation point P2 and spread radially around. In order to protect the test product 4 from the influence of the fragments, the protective barrier 24 is set, avoiding the influence of the fragments on the test product 4. The designed distance between the initiation point and the partition is N1, the distance between the initiation point and the product is N2, and the maximum diameter of the test piece is M1. The diameter M2 of the partition can be calculated as: M2 = M1 * N1 / N2. According to the size of the test piece, the partition is processed into the barrier 24 according to the calculated partition size, and the barrier 24 is installed on the lower bending part 21 through the bolt 25.

[0096] Among them, in order to avoid damage to the product caused by the fall of the barrier, the barrier is preferably made of polyurethane rigid foam or other lightweight materials with certain strength.

[0097] It should be noted that in this embodiment, it is a preferred implementation manner that the barrier is circular.

[0098] Among them, the installation steps S5 of the detonator include:

[0099] Two detonators 26 are respectively installed on two end faces 231 and 232 of the explosive column 23.

[0100] Specifically, in this embodiment, the detonator 26 is an electric detonator. The present invention adopts the design of an initiating explosive column plus an electric detonator. When the electric detonator detonates, it causes the initiating explosive column to detonate. The detonation wave pressure will cut off the S-shaped hook from the initiation point P2, thereby realizing the up-and-down separation of the S-shaped hook. Because the explosion time is extremely short, the instantaneous release of the device can be achieved.

[0101] The following combines Figure 1 , taking a No. 45 steel bar as an example, to specifically illustrate the processing method of the release device of the present invention:

[0102] 1. S-shaped hook design

[0103] It is made of a No. 45 steel bar with a diameter of φ30; the yield strength σs of No. 45 steel is 355 MPa, and a φ20 through hole is drilled in the central part of the S-shaped steel bar. The drilling position is the position with the lowest strength of the release device. According to the area S (which is 154.87 mm2) of this position, the maximum lifting force F1 of this device can be calculated; F1 = σs·S; in order to adapt to test pieces of different weights, release device hooks made of metal materials with different diameters are used.

[0104] 2. Explosion device design

[0105] The explosion device adopts the design of an initiating explosive column plus a detonator. When the detonator detonates, it causes the initiating explosive column to detonate. The detonation wave pressure will cut off the drilling position of the S-shaped hook, thereby realizing the up-and-down separation of the S-shaped hook. Because the explosion time is extremely short, the instantaneous release of the device can be achieved.

[0106] The shear strength σc of 45 steel is 178 MPa. According to the formula Fk = σc*S / 2, the maximum shear strength of the S-shaped hook is calculated to be 13783 MPa.

[0107] In the explosion device, the initiating explosive column JO-8 is selected, with a size of φ20×30 mm, a charge of 17 g, and a TNT equivalent m of 25 g. According to the formula: P = 0.679m / r 3 +0.1013, it is calculated that the shock wave overpressure of the booster explosive column is 16975.1013 MPa. The shock wave pressure is greater than the shear strength of 45 steel, which can ensure the smooth separation of the S-shaped hook.

[0108] 3. Partition design

[0109] When the explosive device acts, fragments will be formed near the detonation position and radiate outwards in all directions. In order to protect the test product from the influence of the fragments, a protective partition is arranged near the detonation device, avoiding the influence of the fragments on the product. The designed distance between the detonation point and the partition is N1, the distance between the detonation point and the product is N2, and the maximum diameter of the test piece is M1. The diameter M2 of the partition can be calculated as: M2 = M1 * N1 / N2; According to the size of the test piece, the partition is processed into the formed according to the calculated size of the partition. In order to avoid damage to the product caused by the fall of the partition, the partition is preferably made of polyurethane rigid foam or other light and strong materials.

[0110] Please refer to Figure 2 again. A release device 2 for a drop test according to the present invention includes: an S-shaped hook mechanism, a charge 23, a barrier 24 and two detonators 26. The hook mechanism includes two bent portions 21 at both ends and a connecting portion 22 connecting the two bent portions. One of the bent portions 21 is hung on a drop frame 1, and the test product is hung on the other bent portion 21 through a sling 3. A through hole K serving as a detonation point P2 is formed in the connecting portion 22; the charge 23 is filled in the through hole K, and the two end faces 231, 232 of the charge 23 are flush with the outer side surface of the connecting portion 221; the barrier 24 is installed on the other bent portion 21 to protect the test product from the influence of fragments; the two detonators 26 are respectively installed on the two end faces 231, 232 of the charge 23; wherein, the charge 23 is detonated by the detonator 26 to cut off the hook mechanism, thereby instantly releasing the test product and realizing the drop of the test product.

[0111] Please refer to Figure 4 - Figure 5 again, Figure 4 is a schematic diagram of the horizontal drop state; Figure 5 is a schematic diagram of the vertical drop state. As Figure 4 - Figure 5 shown, the appearance of the device is an "S"-shaped frame made of different materials. One end is hung at a fixed height position, and the other end suspends the product. By remotely controlling the detonation of the explosive device, the hook is cut off by the energy generated by the explosion, and instantaneously released to realize the drop of the product. The device can realize both the horizontal drop and the vertical drop of the product.

[0112] Wherein, in another embodiment of the present invention, the release device may further include a drop frame 1 and / or a sling 3.

[0113] In summary, the present invention has the following advantages: The present invention cuts off the hook through the energy of explosion to achieve instantaneous release, so it has a wide range of applications, high stability and simple structure. At the same time, the barrier is used to prevent the explosion device from damaging the test product and affecting the test accuracy. And in order to ensure the stability of the release device, a multi-point detonation method is adopted and an explosion device with corresponding energy is matched according to the material and diameter of the hook during the test, so as to ensure the stability of the release device. Moreover, there is no requirement for the state of the drop test piece, and it can be hung on the hook after being adjusted arbitrarily, with a wide range of applications.

[0114] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A processing method for a release device used in a drop test, characterized in that, Including: Material selection step: Obtain the maximum lifting weight of multiple steel bars. After matching the weight of the test product and the safety factor with the maximum lifting weight, select a target steel bar with a first diameter from the multiple steel bars; Processing and forming step: Process the target steel bar to form an S-shaped hook mechanism, determine the detonation point according to the overall height of the hook mechanism, and open a through hole with a second diameter at the detonation point; Charge processing and installation step: Process a detonating charge according to the second diameter and the first diameter, and fill the charge into the through hole; Barrier processing and installation step: After determining the size of the barrier according to the thickness of the partition, the position of the detonation point, and the length of the test product, process a barrier according to the size of the barrier and install the barrier on the hook mechanism; Detonator installation step: Install a detonator on the charge, and detonate the charge through the detonator to cut off the hook mechanism so as to release the test product.

2. The processing method of the release device according to claim 1, characterized in that The material selection step includes: Determine the safe lifting weight of each steel bar according to the maximum lifting weight and the safety factor; After matching the safe lifting weight with the weight of the test product, select the target steel bar from the multiple steel bars.

3. The processing method of the release device according to claim 2, wherein, The material selection step further includes: Obtain the cross-sectional area at the through hole and the yield strength of the target steel bar, calculate the maximum lifting force of the hook mechanism according to the cross-sectional area at the through hole and the yield strength of the target steel bar, and verify the target steel bar after matching the maximum lifting force with the weight of the test product.

4. The processing method of the release device according to claim 2, characterized in that, The processing and forming step includes: Process the target steel bar to form two bending parts at both ends and a connecting part connecting the two bending parts. One bending part is hung on a dropping frame, and the test product is hung on the other bending part through a sling; Determine the position of the detonation point on the connecting part according to the distance between the vertices of the two bending parts; Open the through hole at the position of the detonation point on the connecting part.

5. The processing method of the release device according to claim 4, characterized in that, The charge processing and installation step includes: Obtain the maximum shear strength of the hook mechanism according to the cross-sectional area at the through hole and the shear strength of the target steel bar; Determine the amount of charge according to the second diameter and the first diameter; Determine the TNT equivalent according to the amount of charge and the density of the charge; Determine the shock wave overpressure of the charge according to the TNT equivalent and the radius of the charge; When the shock wave overpressure is greater than or equal to the maximum shear strength, process the charge according to the second diameter and the first diameter and fill it into the through hole; when the shock wave overpressure is less than the maximum shear strength, return to the processing and forming step, enlarge the aperture of the through hole, and then repeat the charge processing and installation step according to the adjusted second diameter.

6. The processing method of the release device according to claim 5, characterized in that, The charge processing and installation step further includes: When filling the charge, the two end faces of the charge are flush with the outer side surface of the connecting part.

7. The processing method of the release device according to claim 4, characterized in that The barrier processing and installation step includes: Obtain the length of the test product after hoisting; Determine a first distance according to the thickness of the partition plate and the position of the initiation point; Determine a second distance according to the position of the initiation point and the position of the suspension point of the test product after hoisting; Determine the diameter of the partition plate according to the length of the test product, the first distance and the second distance, and process the barrier member according to the diameter of the partition plate; Install the barrier member on the lower bending portion; 8. The processing method of the release device according to claim 4, characterized in that, The installation step of the detonating member: Install two detonating members on the two end faces of the explosive column respectively; 9. The processing method of the release device according to claim 1, characterized in that The initial second diameter is 20 mm; 10. A release device for a drop test, characterized in that, Including: An S-shaped hook mechanism, which includes two bending portions at both ends and a connecting portion connecting the two bending portions. One bending portion is hung on a drop frame, and the test product is hung on the other bending portion through a sling. A through hole serving as an initiation point is opened on the connecting portion; An explosive column is filled in the through hole, and the two end faces of the explosive column are flush with the outer side surface of the connecting portion; A barrier member is installed on the other bending portion to protect the test product from the impact of fragments; Two detonating members are respectively installed on the two end faces of the explosive column; Wherein, the explosive column is detonated by the detonating member to cut off the hook mechanism, thereby instantaneously releasing the test product and realizing the drop of the test product.

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