CN106735862B

CN106735862B - Protective cover based on double-sided explosion welding and charging structure

Info

Publication number: CN106735862B
Application number: CN201710009029.XA
Authority: CN
Inventors: 马宏昊; 杨明; 沈兆武; 王波; 陈海军
Original assignee: University of Science and Technology of China USTC
Current assignee: University of Science and Technology of China USTC
Priority date: 2017-01-06
Filing date: 2017-01-06
Publication date: 2023-04-25
Anticipated expiration: 2037-01-06
Also published as: CN106735862A

Abstract

The invention discloses a protective cover based on double-sided explosion welding and a charging structure, wherein the protective cover can be reused and mainly comprises a shell, a buffer layer and a constraint net. The protective cover provides a closed environment for explosion welding, can effectively prevent scattering of upper composite plates and fragments, reduces noise pollution and dust pollution, and provides a safe and comfortable working environment for explosion processing. The charge structure includes a confinement box, a support shell, and an explosive. The support shell is an 8-shaped column shell and is uniformly arranged along the inner surface of the constraint box, so that the support shell not only plays a role in supporting, but also enhances detonation at the boundary, and therefore, the boundary effect is reduced. And the upper surface and the lower surface of the explosive loading structure are respectively attached to the upper compound plate and the lower compound plate, so that the explosive is in a constraint state in all directions. Thereby reducing the critical thickness of explosive initiation and improving the energy utilization rate.

Description

Protective cover based on double-sided explosion welding and charging structure

Technical Field

The invention belongs to the technical field of explosion welding, and particularly relates to a protective cover based on double-sided explosion welding and a charging structure.

Background

The explosion welding utilizes the strong working capability of the explosion of the explosive to push the compound plate to move at high speed and strike the substrate. Under strong impact pressure, the interface metal of the substrate and the compound plate shows fluid property, metal atoms flow and permeate each other, and are mutually meshed together after being cooled, so that metallurgical bonding is realized. Over decades of development, explosion recombination between almost any metals is now possible. The explosion composite board combines the advantages of two or more metals, so that the explosion composite board has the characteristics of excellent performance and low price. Compared with other composite materials, the explosion composite material has simple operation and lower composite cost, and is suitable for large-scale production, so that the product of the explosion composite material is widely applied to industrial production. However, in the traditional explosion welding, the explosive is directly paved on the shroud plate, and the upper end of the explosive is exposed in the air, namely, only the energy at one end of the explosive is utilized, so that the energy utilization rate of the explosive is very low, and a large amount of energy is transmitted into the air, so that great noise pollution can be caused.

In recent years, chinese patent ZL201410396067.1 discloses a double-vertical explosion welding self-locking type protection installation device, which improves the safety performance and welding quality of explosion welding. Chinese patent ZL201310282589.4 discloses a double-sided explosion welding technology based on an explosive with a honeycomb structure, and the manufacturing of the explosive with the honeycomb aluminum structure is difficult and the price is high, so that the explosive is not suitable for being used in a large amount in engineering although the energy utilization rate of the explosive can be improved. In addition, during explosion welding operation in engineering, surface blasting is mostly adopted, or a soil pile is used for covering a welding device, so that the working procedure is complex, the explosive energy utilization rate is low, a large amount of dust and noise are generated after the explosion is finished, and serious environmental pollution is caused. For double-sided welding, the upper composite plate flies for a distance of tens of meters to hundreds of meters under the action of explosive load, and a great potential safety hazard exists.

Disclosure of Invention

The invention aims at solving the defects of high risk coefficient, low explosive energy utilization rate, low working efficiency, serious environmental damage and the like of the existing explosive welding technology, and designs an explosive welding protective cover which is simple in structure, high in safety and reusable, and an economic charging structure with high efficiency and high energy utilization rate.

The aim of the invention is realized by the following technical scheme:

a protective cover based on double-sided explosion welding consists of a shell, a buffer layer and a constraint net, wherein the shell and the constraint net are connected together at the boundary, and the buffer layer is filled in a gap between the shell and the constraint net;

the shell is of an arch structure formed by combining a cylindrical shell and a sub-hemispherical shell, the material can be metal or other impact-resistant materials, the top of the shell is provided with a lifting hook so as to facilitate lifting, and the periphery of the shell is provided with small holes so as to facilitate connection of detonating tubes; a constraint net is connected at the junction of the cylindrical shell and the sub-semicircular shell; a cavity is formed between the restraining net and the sub-semicircular shell, and a buffer layer is arranged in the cavity.

Wherein the buffer layer is formed by stacking buffer materials with high energy absorptivity.

Wherein, the restraint net is composed of a high-strength metal or nonmetal net structure.

The utility model provides a charge structure based on two-sided explosion welding, charge structure include restraint box, support column and explosive, wherein the even inner wall that arranges at restraint box of support column, then with explosive shop full all cavitys to with the upper and lower surface of explosive respectively with upper and lower compound plate laminating.

Wherein, the side length of the constraint box is consistent with the side length of the compound plate, and the height of the constraint box is consistent with the height of the explosive.

The support column is an 8-shaped column shell rolled by aluminum or other metals, namely aluminum sheets are respectively rolled from two ends along opposite directions.

Wherein, pack the explosive into the carton that is provided with the supporting shell, constitute the structure and load, its upper and lower surface is laminated with two compound boards respectively.

The working principle of the invention is that the supporting shell arranged around the explosive not only plays a role of supporting the upper composite plate to avoid the explosion caused by the explosion, but also has strong constraint on the periphery of the explosive, so that the explosive is enhanced at the boundary detonation, thereby improving the energy utilization rate of the explosive and reducing the boundary effect in explosion welding. And the upper composite board flies upwards with strong kinetic energy after the explosive is detonated, and the energy is absorbed by the buffer layer when the explosive impacts the protective net. Meanwhile, a large amount of detonation products expand to act on the shell, and the energy is converted into deformation energy and kinetic energy of the shell, so that potential safety hazards and environmental pollution are reduced.

The invention has the advantages that:

1. the protective cover designed by the invention provides a closed environment for explosion processing, and overcomes the limit of the environment to explosion operation. Noise pollution is greatly reduced, the upper composite board and fragment movement are restrained, the safety of explosion operation is improved, and a safe and comfortable working environment is provided for workers; moreover, the protective cover can be repeatedly used, is simple to operate, and avoids complex procedures and dust pollution of soil piling coverage in traditional explosion welding.

2. The charging structure designed by the invention constrains all directions of the explosive, so that the critical diameter of explosive initiation is reduced, the energy utilization rate is improved, the boundary effect in explosion welding is reduced, the operation is simple, the using amount of the explosive is reduced, and the method has great economic benefit.

3. The 8-shaped column shell supporting shell designed by the invention can be used for supporting between two compound plates and supporting between base compound plates, is simple to manufacture, is not easy to bend and unstably occur, can bear larger load, is easy to discharge air, and has smaller influence on the quality of the compound plate at the position.

Drawings

FIG. 1 is a schematic view of a containment hood and explosive welding apparatus of the present invention; the method comprises the steps of carrying out a first treatment on the surface of the

FIG. 2 is a schematic view of the charge construction of the present invention; the method comprises the steps of carrying out a first treatment on the surface of the

FIG. 3 is a schematic view of a column housing support housing in the shape of an "8" in accordance with the present invention; the method comprises the steps of carrying out a first treatment on the surface of the

The component names of the drawing numbers in the drawings are as follows: 1-a restraint shell cylinder shell; 2-restraining the cover sub-hemispherical shell; 3-a restraint hood hook; 4-a constraint hood buffer layer; 5-a restraint cover protective net; 6-a lower substrate; 7-a support shell; 8-lower compound plate; 9-explosive; 10-coating a composite board; 11-an upper substrate; 12-detonator; 13-foundation; 14-explosive; 15-a support shell; 16-restraint boxes.

Detailed Description

The invention is further described below with reference to the drawings and examples.

A protective cover based on double-sided explosion welding consists of a shell, a buffer layer and a constraint net, wherein the shell is of an arch structure formed by combining a cylindrical shell and a sub-hemispherical shell, the size of the shell is determined by the size and thickness of a plate, the material can be metal or other impact-resistant materials, a lifting hook is arranged at the top of the shell so as to facilitate lifting, and small holes are formed in the periphery of the shell so as to facilitate connection of detonating tubes. And a constraint net is connected at the junction of the cylindrical shell and the sub-semicircular shell, wherein the constraint net is of a high-strength net structure, and is preferably an iron wire net or a steel wire net. A cavity is formed between the restraining net and the sub-semicircular shell, and a buffer layer is arranged in the cavity, wherein the buffer layer is formed by stacking buffer materials, and the buffer materials are made of porous materials (such as foamed aluminum and foamed plastic), preferably waste tires.

In addition, the invention also provides a simple and easy double-sided welding-based high-energy-utilization-rate charging structure, which comprises a constraint box, a support shell and an explosive. Wherein the side length of the constraint box is consistent with the side length of the compound plate, the height of the constraint box is consistent with the height of the explosive, and the material of the constraint box is preferably paperboard or wood plate. The support shells are uniformly arranged around the constraint box, and the setting gap is more than or equal to 0mm and less than or equal to 20mm. For large-size panels, a support shell is also provided in the middle of the restraint box or elsewhere to prevent bending of the doubler. The supporting shell is an 8-shaped column shell rolled by aluminum or other metals, namely aluminum sheets are respectively rolled from two ends along opposite directions, the heights of the supporting shell are consistent with the heights of explosive, the diameters of the supporting shell and the explosive are more than or equal to 10mm, the diameters of the supporting shell and the explosive are less than or equal to 20mm, and the wall thickness of the supporting shell is more than or equal to 0.5mm and less than or equal to 2mm. Explosive is filled into the paper box provided with the supporting shell to form structural explosive, and the upper surface and the lower surface of the structural explosive are respectively attached to the two compound plates. The explosive is an explosion welding explosive (such as emulsion explosive or powdery ammonium nitrate explosive) commonly used in industry.

Example 1

Aiming at double-sided explosion welding of stainless steel and steel, a protective cover and a charging structure are invented, wherein the size of a substrate is 2000mm multiplied by 20mm; the dimensions of the composite plate are 2000mm by 5mm.

Referring to fig. 1, the double sided explosion welding restraint housing includes: a shell, a buffer layer and a restraint net. Wherein the shell material is iron, the inner diameter of the shell material is 3000mm, the wall thickness of the shell material is 20mm, the shell material is in an arc-shaped structure formed by a cylindrical shell and a sub-hemispherical shell, the height of the cylindrical shell is 1000mm, and the height of the sub-hemispherical shell is 500mm; the buffer layer is filled with junked tires; the constraint net is a steel wire net.

Referring to fig. 2, the double sided explosive welding charge structure includes: a confinement box, a support shell and an explosive. The constraint box is selected as a paper box, the side length of the constraint box is 2000mm of the side length of a double plate, the wall thickness of the constraint box is 5mm, and the height of the constraint box is 10mm; along restraint box inner wall, closely be provided with the supporting shell, because panel size is great, in order to prevent compound board bending, also corresponding arrangement has the supporting shell in the middle of restraint box. The supporting shell is an 8-shaped column shell (figure 3) rolled by aluminum sheets, the wall thickness of the supporting shell is 1mm, and the height of the supporting shell is 10mm; the explosive is powdery ammonium nitrate with the density of 0.8g/cm ³ The thickness is 10mm, and the upper and lower surfaces are respectively attached to the upper and lower compound plates.

After the explosion is finished, the upper and lower composite boards meet the standard through ultrasonic detection. The upper composite board collides with the constraint cover after flying at a high speed for a certain distance, the energy of the upper composite board is absorbed by the buffer layer, and the board and the constraint cover are kept intact. For the traditional explosion welding method, aiming at the explosion welding of the stainless steel and the steel, the thickness of the explosive is 20mm, and only one composite board can be compounded at a time, but by adopting the charging structure, the thickness of the explosive is reduced by 10mm, and two composite boards are compounded each time, so that the energy utilization rate is improved by 4 times; meanwhile, due to the constraint function of the boundary support, the influence of the boundary sparse wave is reduced, and the boundary effect of the composite board is obviously improved.

While the foregoing has been described in terms of illustrative embodiments of the invention to facilitate the understanding of the invention by those skilled in the art, it should be understood that the invention is not limited to the precise embodiments and that various changes may be made by those skilled in the art without departing from the spirit and scope of the invention as defined and defined by the appended claims, all such changes and modifications that are apparent to the invention are intended to be protected.

Claims

1. Protective cover based on two-sided explosion welding, its characterized in that: the device consists of a shell, a buffer layer and a constraint net, wherein the shell and the constraint net are connected together at the boundary, and the buffer layer is filled in a gap between the shell and the constraint net;

the shell is of an arch structure formed by combining a cylindrical shell and a sub-hemispherical shell, the material can be metal or other impact-resistant materials, the top of the shell is provided with a lifting hook so as to facilitate lifting, and the periphery of the shell is provided with small holes so as to facilitate connection of detonating tubes; a constraint net is connected at the junction of the cylindrical shell and the sub-semicircular shell; a cavity is formed between the constraint net and the sub-semicircle shell, and a buffer layer is arranged in the cavity;

the buffer layer is formed by stacking buffer materials with high energy absorptivity;

the constraint net consists of a high-strength metal or nonmetal net structure.