A blasting device and a rock blasting method

Abstract

This invention discloses a blasting device and a rock blasting method, relating to the field of rock blasting technology, which can improve construction efficiency. The blasting device includes a shell, a first shaped charge liner, and a second shaped charge liner, the first and second shaped charge liners being disposed opposite to each other; both the first and second shaped charge liners are parabolic metal liners; the shell includes a first outer wall and a second outer wall, the first and second outer walls being disposed opposite to each other, the first shaped charge liner being fixedly connected to the left side of the first outer wall and the left side of the second outer wall respectively, and the second shaped charge liner being fixedly connected to the right side of the first outer wall and the right side of the second outer wall respectively; the cavity formed by the first outer wall, the second outer wall, the first shaped charge liner, and the second shaped charge liner is used to store explosives. This invention is applied to rock blasting scenarios.

Description

Technical Field

[0001] This invention relates to the field of rock blasting technology, and more particularly to a blasting device and a rock blasting method. Background Technology

[0002] In mining operations, blasting is frequently used to break large rocks. Currently, the commonly used blasting methods include the following three: The first method is slot blasting, which involves cutting a groove along the edge of the borehole and inserting a shaped charge containing explosives into the borehole for detonation. The second method is slit-charge blasting, which uses special attachments to generate localized stress for detonation. The third method is shaped charge blasting, which produces a more directional shock wave and is therefore safer.

[0003] When using shaped charge blasting, the commonly used shaped charge liner is a curved groove with a triangular cross-section. If this type of shaped charge liner is used, the maximum head velocity of the metal stream is small and the jet length is short during blasting, resulting in poor rock-breaking effect. This leads to a small spacing between blasting holes, a large number of blasting holes, and low construction efficiency. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a blasting device and a rock blasting method, which can improve construction efficiency.

[0005] In a first aspect, embodiments of the present invention provide a blasting device, including a shell, a first shaped charge liner, and a second shaped charge liner, wherein the first shaped charge liner and the second shaped charge liner are disposed opposite to each other; both the first shaped charge liner and the second shaped charge liner are parabolic metal liners, wherein the parabolic surface of the first shaped charge liner is concave towards the direction of the second shaped charge liner, and the parabolic surface of the second shaped charge liner is concave towards the direction of the first shaped charge liner; the shell includes a first outer wall and a second outer wall, wherein the first outer wall and the second outer wall are disposed opposite to each other, the first shaped charge liner is fixedly connected to the left side of the first outer wall and the left side of the second outer wall respectively, and the second shaped charge liner is fixedly connected to the right side of the first outer wall and the right side of the second outer wall respectively; the cavity formed by the first outer wall, the second outer wall, the first shaped charge liner, and the second shaped charge liner is used to store explosives.

[0006] Optionally, the cross-sections of the first outer wall and the second outer wall are circular arc shapes.

[0007] Optionally, the cross-sections of the first and second propellant liner are parabolic, and the focal length of the parabola is 0.4.

[0008] Optionally, the first and second propellant shrouds are made of copper.

[0009] Optionally, the first outer wall and the second outer wall are made of copper or polyvinyl chloride.

[0010] Optionally, a first baffle and a second baffle are respectively provided at the two end faces of the cavity; the first baffle is fixedly connected to the first horizontal end face of the first outer wall, the first horizontal end face of the second outer wall, the first horizontal end face of the first shaped charge cover, and the first horizontal end face of the second shaped charge cover; the second baffle is fixedly connected to the second horizontal end face of the first outer wall, the second horizontal end face of the second outer wall, the second horizontal end face of the first shaped charge cover, and the second horizontal end face of the second shaped charge cover.

[0011] Optionally, the first baffle has a first through hole at its center, and a detonator is disposed in the first through hole; or, the second baffle has a second through hole at its center, and a detonator is disposed in the second through hole.

[0012] Optionally, on the parabolic surface of the first shaped charge, a plurality of recesses are symmetrically arranged with respect to the center face of the parabolic surface of the first shaped charge, each recess being recessed toward the interior of the sealing cavity; and / or, on the parabolic surface of the second shaped charge, a plurality of recesses are symmetrically arranged with respect to the center face of the parabolic surface of the second shaped charge, each recess being recessed toward the interior of the cavity.

[0013] Secondly, embodiments of the present invention provide a rock blasting method, comprising: constructing blasting holes in the rock mass to be blasted according to a preset blasting direction; placing a blasting device in the blasting holes; the blasting device being any of the aforementioned blasting devices; detonating explosives in the cavity, wherein after the explosives detonate, the top of the first shaped charge liner is ruptured to form a first metal jet, and the top of the second shaped charge liner is ruptured to form a second metal jet; the first metal jet impacts the inner wall of the blasting holes to form a first crack, and the second metal jet impacts the inner wall of the blasting holes to form a second crack; the first crack and the second crack are on the same straight line; the gas generated when the explosives detonate exerts an impact force along the first crack and the second crack, thereby further lengthening the first crack and the second crack.

[0014] Optionally, before placing the blasting device in the blasting hole, the rock blasting method further includes: wrapping the first outer wall and the second outer wall with an elastic material.

[0015] Optionally, the elastic material is foam or sponge.

[0016] Optionally, after the explosive detonates, the top of the first shaped charge liner is shattered to form a first metal jet, and the top of the second shaped charge liner is shattered to form a second metal jet, including: after the explosive detonates, the top of the first shaped charge liner is shattered to form a first metal jet, and the side of the first shaped charge liner is shattered to form a third metal jet; after the explosive detonates, the top of the second shaped charge liner is shattered to form a second metal jet, and the side of the second shaped charge liner is shattered to form a fourth metal jet;

[0017] The first metal jet impacts the inner wall of the blasting borehole to form a first crack, comprising: the first metal jet impacts the inner wall of the blasting borehole to form a first crack; the third metal jet enters the first crack and expands the first crack to form a third crack.

[0018] The second metal jet impacts the inner wall of the blasting borehole to form a second crack, including: the second metal jet impacts the inner wall of the blasting borehole to form a second crack; the fourth metal jet enters the second crack and expands the second crack to form a fourth crack;

[0019] The gas generated during the explosion of the explosive exerts an impact force along the first crack, thereby further increasing the length of the first crack, including: the gas generated during the explosion of the explosive exerts an impact force along the third crack, thereby further increasing the length of the third crack;

[0020] The gas generated during the explosion of the explosive exerts an impact force along the second crack, thereby further increasing the length of the second crack, including: the gas generated during the explosion of the explosive exerts an impact force along the fourth crack, thereby further increasing the length of the fourth crack.

[0021] This invention provides a blasting device, including a shell, a first shaped charge liner, and a second shaped charge liner, wherein the first shaped charge liner and the second shaped charge liner are disposed opposite to each other; both the first shaped charge liner and the second shaped charge liner are parabolic metal liners, with the parabolic surface of the first shaped charge liner recessed towards the direction of the second shaped charge liner, and the parabolic surface of the second shaped charge liner recessed towards the direction of the first shaped charge liner; the shell includes a first outer wall and a second outer wall, wherein the first outer wall and the second outer wall are disposed opposite to each other, the first shaped charge liner is fixedly connected to the left side of the first outer wall and the left side of the second outer wall, respectively, and the second shaped charge liner is fixedly connected to the right side of the first outer wall and the right side of the second outer wall, respectively; the cavity formed by the first outer wall, the second outer wall, the first shaped charge liner, and the second shaped charge liner is used to store explosives. In this way, compared to the shaped charge liner in the prior art, the generatrix lengths of the first and second shaped charge liners in this embodiment of the invention are longer. Therefore, when the explosive detonates in the cavity, shattering the first and second shaped charge liners into fragments, the maximum head jet velocity of the metal flow can be increased, while simultaneously reducing the volume of the rammed earth (i.e., the shaped charge liner that does not form a metal flow). This increases the jet length and thus improves the rock-breaking effect. Therefore, this embodiment of the invention can increase the spacing between blasting holes, reduce the number of blasting holes, and improve construction efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a blasting device provided in an embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional schematic diagram of various blasting devices in the embodiments of the present invention;

[0025] Figure 3A and Figure 3B These are simulation graphics of various explosive devices in the embodiments of the present invention during explosion;

[0026] Figure 4A , Figure 4B , Figure 4C as well as Figure 4D This is a schematic diagram showing the jet length of various blasting devices during explosion in embodiments of the present invention.

[0027] Figure 5This is a schematic flowchart of a rock blasting method provided in an embodiment of the present invention. Detailed Implementation

[0028] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] This invention provides a blasting device, see [link to relevant documentation]. Figure 1 The blasting device provided in this embodiment of the invention may include a shell, a first shaped charge liner 1, and a second shaped charge liner 2, wherein the first shaped charge liner 1 and the second shaped charge liner 2 are disposed opposite to each other; both the first shaped charge liner 1 and the second shaped charge liner 2 are parabolic metal liners, wherein the parabolic surface of the first shaped charge liner 1 is concave towards the direction where the second shaped charge liner 2 is located, and the parabolic surface of the second shaped charge liner 2 is concave towards the direction where the first shaped charge liner 1 is located; the shell includes a first outer wall 3 and a second outer wall 4, wherein the first outer wall 3 and the second outer wall 4 are disposed opposite to each other, the first shaped charge liner 1 is fixedly connected to the left side of the first outer wall 3 and the left side of the second outer wall 4 respectively, and the second shaped charge liner 2 is fixedly connected to the right side of the first outer wall 3 and the right side of the second outer wall 4 respectively; the cavity 5 formed by the first outer wall 3, the second outer wall 4, the first shaped charge liner 1, and the second shaped charge liner 2 is used to store explosives.

[0031] In this embodiment of the invention, the blasting device may include a housing, a first shaped charge liner 1, and a second shaped charge liner 2. The first shaped charge liner 1 and the second shaped charge liner 2 are disposed opposite to each other, and the centerline of the first shaped charge liner 1 and the centerline of the second shaped charge liner 2 are on the same straight line. Both the first shaped charge liner 1 and the second shaped charge liner 2 are parabolic metal liners, with the parabolic surface of the first shaped charge liner 1 concave towards the direction where the second shaped charge liner 2 is located, and the parabolic surface of the second shaped charge liner 2 concave towards the direction where the first shaped charge liner 1 is located.

[0032] The housing includes a first outer wall 3 and a second outer wall 4, which are disposed opposite to each other. The shapes of the first outer wall 3 and the second outer wall 4 can be designed according to actual needs, and the specific shapes are not limited in this embodiment of the invention. A first shaped charge 1 is fixedly connected to the left side of the first outer wall 3 and the left side of the second outer wall 4, respectively. A second shaped charge 2 is fixedly connected to the right side of the first outer wall 3 and the right side of the second outer wall 4, respectively. The specific fixing and connection methods are not limited in this embodiment of the invention.

[0033] like Figure 1 As shown, the first outer wall 3, the second outer wall 4, the first shaped charge shroud 1, and the second shaped charge shroud 2 can form a cavity 5, in which explosives can be stored, specifically trinitrotoluene.

[0034] The blasting device provided in this embodiment of the invention, because the first shaped charge liner 1 and the second shaped charge liner 2 are parabolic in shape, and the generatrix length of the parabola is longer than that of commonly used shaped charge liners, can increase the maximum head jet velocity of the metal flow when the explosive in the cavity 5 detonates and shatters the first shaped charge liner 1 and the second shaped charge liner 2 into fragments. Simultaneously, it can reduce the volume of the blasting body (i.e., the first shaped charge liner 1 and the second shaped charge liner 2 before the metal flow is formed), thus increasing the jet length and improving the rock-breaking effect. Therefore, this embodiment of the invention can increase the spacing between blasting holes, reduce the number of blasting holes, and improve construction efficiency.

[0035] Optionally, in one embodiment of the present invention, the cross-sections of the first outer wall 3 and the second outer wall 4 are arc-shaped.

[0036] In embodiments of the present invention, such as Figure 1 As shown, the cross-sectional shape of the first outer wall 3 and the second outer wall 4 can be an arc shape, and this arc shape can be concave towards the outside of the blasting device. The direction in which the first outer wall 3 and the second outer wall 4 are located are the non-blasting parts, and the direction in which the first shaped charge liner 1 and the second shaped charge liner 2 are located are the blasting parts. Specifically, after placing the blasting device in the borehole in the rock mass, the direction of the central axis of the first shaped charge liner 1 and the direction of the central axis of the second shaped charge liner 2 can be aligned with the preset blasting direction, thereby ensuring that the explosive in the cavity 5 can blast the rock mass open along the preset direction when it explodes.

[0037] Optionally, in one embodiment of the present invention, the cross-sections of the first shaped charge 1 and the second shaped charge 2 are parabolic, and the focal length of the parabola is 0.4.

[0038] In this embodiment of the invention, the cross-sections of the first shaped charge liner 1 and the second shaped charge liner 2 can be parabolic. Through analysis of simulation results of the explosion effect, the inventors discovered that the optimal focal length is 0.4. When this optimal value is used, the length of the metal jet and the maximum head jet velocity can be increased, thereby further improving the stone-breaking effect. Figure 2 The diagram shows the cross-section of the blasting device when the focal length (i.e., P value) of the parabola is 0.4, 0.6, 0.8 and 1. Figure 3A and Figure 3BThe simulation diagrams of the blasting device during blasting are shown with focal lengths of 0.4, 0.6, 0.8 and 1. It can be seen from the figure that the maximum head jet velocity is the highest when the focal length of the parabola is 0.4. Figure 4A , Figure 4B , Figure 4C and Figure 4D The diagram shows the jet length of the blasting device during blasting when the focal lengths are 0.4, 0.6, 0.8, and 1. When the focal length of the parabola is 0.4, the metal jet length is 88.8 mm; when the focal length is 0.6, the metal jet length is 63.6 mm; when the focal length is 0.8, the metal jet length is 50.5 mm; and when the focal length is 1, the metal jet length is 39.7 mm.

[0039] Optionally, in one embodiment of the present invention, the first shaped charge 1 and the second shaped charge 2 are made of copper.

[0040] In this embodiment of the invention, the first shaped charge liner 1 and the second shaped charge liner 2 can be made of copper. When the explosive detonates, the copper can be shattered into fragments, thereby forming a high-speed metal flow of copper fragments. When the high-speed metal flow hits the inner wall of the borehole, it can achieve the effect of crushing rocks.

[0041] Optionally, in one embodiment of the present invention, the first outer wall 3 and the second outer wall 4 are made of copper or polyvinyl chloride.

[0042] In this embodiment of the invention, the first outer wall 3 and the second outer wall 4 can be made of copper. In this case, the first outer wall 3, the second outer wall 4, the first shaped charge 1, and the second shaped charge 2 can be manufactured in a single process, thereby improving production efficiency and reducing economic costs. Alternatively, the first outer wall 3 and the second outer wall 4 can also be made of polyvinyl chloride. In this case, the first outer wall 3, the second outer wall 4, the first shaped charge 1, and the second shaped charge 2 can be manufactured separately, and then these four parts can be fixedly connected.

[0043] Optionally, in one embodiment of the present invention, a first baffle and a second baffle are respectively provided at the two end faces of the cavity 5; the first baffle is fixedly connected to the first horizontal end face of the first outer wall 3, the first horizontal end face of the second outer wall 4, the first horizontal end face of the first shaped charge cover 1, and the first horizontal end face of the second shaped charge cover 2; the second baffle is fixedly connected to the second horizontal end face of the first outer wall 3, the second horizontal end face of the second outer wall 4, the second horizontal end face of the first shaped charge cover 1, and the second horizontal end face of the second shaped charge cover 2.

[0044] In this embodiment of the invention, a first baffle and a second baffle can be respectively provided at the two end faces of the cavity 5; the first baffle is fixedly connected to the first horizontal end face of the first outer wall 3, the first horizontal end face of the second outer wall 4, the first horizontal end face of the first shaped charge liner 1, and the first horizontal end face of the second shaped charge liner 2; the second baffle is fixedly connected to the second horizontal end face of the first outer wall 3, the second horizontal end face of the second outer wall 4, the second horizontal end face of the first shaped charge liner 1, and the second horizontal end face of the second shaped charge liner 2, thus forming a closed cavity 5. After storing explosives in the closed cavity 5, the explosive power can be enhanced after detonation compared to a design without baffles at the two end faces, thereby further improving the stone-crushing effect.

[0045] Optionally, in one embodiment of the present invention, a first through hole is provided at the center of the first baffle, and a detonator is provided in the first through hole; or, a second through hole is provided at the center of the second baffle, and a detonator is provided in the second through hole.

[0046] In this embodiment of the invention, a first through hole may be provided at the center of the first baffle, allowing a detonator to pass through the first through hole and come into contact with the explosive in the cavity 5. When the detonator is detonated, it detonates the explosive in the cavity 5. Similarly, a detonator may also pass through a second through hole at the center of the second baffle and come into contact with the explosive in the cavity 5.

[0047] Optionally, in one embodiment of the present invention, a plurality of recesses are symmetrically arranged on the parabolic surface of the first shaped charge 1 relative to the center face of the parabolic surface of the first shaped charge 1, and each recess is recessed toward the interior of the sealing cavity 5; and / or, a plurality of recesses are symmetrically arranged on the parabolic surface of the second shaped charge 2 relative to the center face of the parabolic surface of the second shaped charge 2, and each recess is recessed toward the interior of the cavity 5.

[0048] In this embodiment of the invention, multiple recesses can be symmetrically arranged on the parabolic surface of the first shaped charge 1 relative to the center plane of the parabolic surface of the first shaped charge 1. Each recess is recessed toward the interior of the sealing cavity 5. This embodiment of the invention does not specifically limit the curvature of the recesses. Similarly, multiple recesses can be symmetrically arranged on the parabolic surface of the second shaped charge 2 relative to the center plane of the parabolic surface of the second shaped charge 2. Each recess is recessed toward the interior of the sealing cavity 5. This embodiment of the invention does not specifically limit the curvature of the recesses. Furthermore, recesses can be provided simultaneously on both the parabolic surfaces of the first shaped charge 1 and the second shaped charge 2 in the manner described above.

[0049] This design approach can further enhance the explosive effect. Specifically, it can increase the maximum head jet velocity and length of the metal stream, thereby enhancing the debris-shattering effect.

[0050] This invention provides a rock blasting method, see [link to relevant documentation]. Figure 5 The rock blasting method provided in this embodiment of the invention may include:

[0051] S11, according to the preset blasting direction, make blasting holes for the rock mass to be blasted;

[0052] In this step, the blasting direction of the rock mass can be determined according to actual needs. Based on the blasting direction, blasting holes can be made at appropriate locations in the rock mass to be blasted. The size of these blasting holes can be slightly larger than the size of the blasting device.

[0053] S12, placing a blasting device in the blasting hole; the blasting device is any one of the blasting devices described in the foregoing embodiments;

[0054] In this step, a blasting device can be inserted into the blast hole, wherein the blasting device is any one of the blasting devices described in the foregoing embodiments.

[0055] S13, detonate the explosive in the cavity. After the explosive detonates, it ruptures the top of the first shaped charge liner to form a first metal jet and ruptures the top of the second shaped charge liner to form a second metal jet.

[0056] In this step, when blasting is required on the rock mass, the explosives in the cavity can be detonated. The energy generated by the explosion can shatter the top of the first shaped charge liner, forming the first metal jet. Simultaneously, it can also shatter the top of the second shaped charge liner, forming the second metal jet. When the first and second shaped charge liners have the same shape and material, the maximum head jet velocity and jet length of the first and second metal jets are equal.

[0057] S14, the first metal jet impacts the inner wall of the blasting borehole, forming a first crack, and the second metal jet impacts the inner wall of the blasting borehole, forming a second crack; the first crack and the second crack are on the same straight line;

[0058] In this step, a high-speed first metal jet impacts the inner wall of the blasting borehole with tremendous force, forming a first crack. Similarly, a high-speed second metal jet impacts the inner wall of the blasting borehole with tremendous force, forming a second crack. Since the first and second metal jets are in opposite directions, the first and second cracks are in opposite directions.

[0059] S15, the gas generated when the explosive detonates generates an impact force along the first crack and the second crack, so that the length of the first crack and the second crack is further increased.

[0060] In this step, the high-pressure gas generated during the explosive detonation creates a powerful impact force along the first crack, further lengthening the first crack and increasing the penetration depth in the direction of the first crack. Similarly, the high-pressure gas generated during the explosive detonation creates a powerful impact force along the second crack, further lengthening the second crack and increasing the penetration depth in the direction of the second crack.

[0061] Because the first and second shaped charge liner in this embodiment of the invention are parabolic in shape, and the generatrix lengths of the first and second shaped charge liners are longer than those of commonly used shaped charge liners, the explosion of the explosive in the cavity, which shatters the first and second shaped charge liners into fragments, can increase the maximum head jet velocity of the metal stream. Simultaneously, it can reduce the volume of the blasting body (i.e., the first and second shaped charge liners before the metal stream is formed), thus increasing the jet length and improving the stone-breaking effect. Therefore, the stone-breaking effect can be further enhanced. Thus, this embodiment of the invention can increase the spacing between blasting holes, reduce the number of blasting holes, and improve construction efficiency.

[0062] Optionally, in one embodiment of the present invention, before placing the blasting device in the blasting borehole, the rock blasting method further includes: wrapping the first outer wall and the second outer wall with an elastic material.

[0063] In this embodiment of the invention, since the central axis of the first shaped charge liner 1 and the second shaped charge liner is in the energy-concentrating direction, which is consistent with the preset blasting direction, while the direction of the first outer wall and the second outer wall is in the non-energy-concentrating direction, in order to reduce the damage to the rock mass in the non-energy-concentrating direction, elastic material can be wrapped on the first outer wall and the second outer wall to form an effective buffer.

[0064] Optionally, in one embodiment of the present invention, the elastic material is foam or sponge.

[0065] In this embodiment of the invention, the elastic material can specifically be a sponge with a high elastic modulus or a foam with a high elastic modulus, thereby effectively protecting the rock mass in the non-focusing direction. At the same time, these materials are inexpensive, helping to reduce costs.

[0066] Optionally, in one embodiment of the present invention, after the explosive detonates, the top of the first shaped charge liner 1 is ruptured to form a first metal jet, and the top of the second shaped charge liner is ruptured to form a second metal jet, including: after the explosive detonates, the top of the first shaped charge liner 1 is ruptured to form a first metal jet, and the side of the first shaped charge liner 1 is ruptured to form a third metal jet; after the explosive detonates, the top of the second shaped charge liner is ruptured to form a second metal jet, and the side of the second shaped charge liner is ruptured to form a fourth metal jet; wherein, the first metal jet impacts the inner wall of the blasting borehole to form a first crack, including: the first metal jet impacts the inner wall of the blasting borehole to form a first crack; the third metal jet enters the first crack and expands the first crack to form a fourth metal jet. The third crack; the second metal jet impacts the inner wall of the blasting borehole to form a second crack, including: the second metal jet impacts the inner wall of the blasting borehole to form a second crack; the fourth metal jet enters the second crack and expands the second crack to form a fourth crack; the gas generated during the explosive detonation exerts an impact force along the first crack to further lengthen the first crack, including: the gas generated during the explosive detonation exerts an impact force along the third crack to further lengthen the third crack; the gas generated during the explosive detonation exerts an impact force along the second crack to further lengthen the second crack, including: the gas generated during the explosive detonation exerts an impact force along the fourth crack to further lengthen the fourth crack.

[0067] In this embodiment of the invention, the powerful energy generated by the explosion of the explosive in the cavity can shatter the top of the first shaped charge liner into metal fragments. These high-speed metal fragments can form a first metal jet. The high-speed first metal jet can generate a blasting impact on the intrusion surface of the blasting borehole, thereby creating a first crack on the blasting intrusion surface. After the explosive in the cavity explodes, it can also shatter the side of the shaped charge liner, forming a high-speed third metal jet. The high-speed third metal jet enters the first crack formed in the aforementioned process, impacts the first crack, and expands to form a third crack. Therefore, the width of the third crack is larger and the length is longer than that of the first crack.

[0068] Similarly, the powerful energy generated by the explosion of the explosive in the cavity can also shatter the top of the second shaped charge liner into metal fragments. These high-speed metal fragments can form a second metal jet. The high-speed second metal jet can generate a blasting impact on the other intrusion surface of the blasting hole, thereby creating a second crack on the other intrusion surface. After the explosive in the cavity explodes, it can also shatter the side of the shaped charge liner, forming a high-speed fourth metal jet. This high-speed fourth metal jet enters the second crack formed in the aforementioned process, impacts the second crack, and expands to form a fourth crack. Therefore, the fourth crack is wider and longer than the second crack.

[0069] The high-pressure gas generated when the explosives in the cavity detonate will also generate a strong impact force along the third and fourth cracks, thereby further lengthening the third and fourth cracks, increasing the penetration depth, and further enhancing the stone crushing effect.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0071] In this embodiment of the invention, the term "and / or" describes the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0072] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0073] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A blasting device, characterized in that The shell, the first baffle and the second baffle, the first baffle and the second baffle are both parabolic metal covers, the parabola of the first baffle is concave towards the direction of the second baffle, and the parabola of the second baffle is concave towards the direction of the first baffle; The shell comprises a first outer wall and a second outer wall, the first outer wall and the second outer wall are oppositely arranged, the first baffle is fixedly connected with the left side of the first outer wall and the left side of the second outer wall respectively, and the second baffle is fixedly connected with the right side of the first outer wall and the right side of the second outer wall respectively; the cavity formed by the first outer wall, the second outer wall, the first baffle and the second baffle is used for storing explosives; The cross section of the first baffle and the second baffle is parabolic, and the focal length of the parabola is 0.4; On the parabola of the first baffle, a plurality of recessed portions are symmetrically arranged with respect to the center of the parabola of the first baffle, and each recessed portion is concave towards the inside of the cavity; and / or, On the parabola of the second baffle, a plurality of recessed portions are symmetrically arranged with respect to the center of the parabola of the second baffle, and each recessed portion is concave towards the inside of the cavity.

2. The blasting device of claim 1, wherein The cross section of the first outer wall and the second outer wall is circular arc shape.

3. The blasting device of claim 1, wherein The material of the first baffle and the second baffle is red copper.

4. The blasting device of claim 1, wherein The material of the first outer wall and the second outer wall is red copper or polyvinyl chloride.

5. The blasting device of claim 1, wherein The two end faces of the cavity are respectively provided with a first baffle and a second baffle; the first baffle is fixedly connected with the first transverse end face of the first outer wall, the first transverse end face of the second outer wall, the first transverse end face of the first baffle and the first transverse end face of the second baffle; the second baffle is fixedly connected with the second transverse end face of the first outer wall, the second transverse end face of the second outer wall, the second transverse end face of the first baffle and the second transverse end face of the second baffle.

6. The blasting device of claim 5, wherein, The center of the first baffle is provided with a first through hole, and an initiating detonator is arranged in the first through hole; or the center of the second baffle is provided with a second through hole, and an initiating detonator is arranged in the second through hole.

7. A method of rock mass blasting, characterized by, It comprises: According to the preset blasting direction, the blasting hole of the rock mass to be blasted is made; The blasting device is placed in the blasting hole; The blasting device is the blasting device in any one of the preceding claims 1 to 6; The explosive in the cavity is detonated, and after the explosion of the explosive, the top of the first baffle is cracked to form a first metal jet, and the top of the second baffle is cracked to form a second metal jet; The first metal jet impacts the inner wall of the blasting hole to form a first crack, and the second metal jet impacts the inner wall of the blasting hole to form a second crack; the first crack and the second crack are on the same straight line; The gas generated when the explosive explodes generates an impact force along the first crack and the second crack, so as to further lengthen the length of the first crack and the second crack.

8. A method of rock mass blasting according to claim 7, characterised in that, Before placing the blasting device in the blasting hole, the rock mass blasting method further comprises: wrapping elastic material on the first outer wall and the second outer wall.

9. A method of rock mass blasting according to claim 8, characterised in that, The elastic material is foam or sponge.

10. The method of claim 7, wherein, After the explosion of the explosive, the top of the first shaped charge is cracked to form a first metal jet, and the top of the second shaped charge is cracked to form a second metal jet, comprising: After the explosion of the explosive, the top of the first shaped charge is cracked to form a first metal jet, and the side of the first shaped charge is cracked to form a third metal jet; after the explosion of the explosive, the top of the second shaped charge is cracked to form a second metal jet, and the side of the second shaped charge is cracked to form a fourth metal jet; Wherein, the first metal jet impacts the inner wall of the blasting hole to form a first crack, comprising: the first metal jet impacts the inner wall of the blasting hole to form a first crack; the third metal jet enters the first crack to expand the first crack to form a third crack; The second metal jet impacts the inner wall of the blasting hole to form a second crack, comprising: the second metal jet impacts the inner wall of the blasting hole to form a second crack; the fourth metal jet enters the second crack to expand the second crack to form a fourth crack; The gas generated by the explosion of the explosive generates an impact force along the first crack to further lengthen the length of the first crack, comprising: the gas generated by the explosion of the explosive generates an impact force along the third crack to further lengthen the length of the third crack; The gas generated by the explosion of the explosive generates an impact force along the second crack to further lengthen the length of the second crack, comprising: the gas generated by the explosion of the explosive generates an impact force along the fourth crack to further lengthen the length of the fourth crack.

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