Device for weakening charge at upper part of rock-soil blasting hole

Abstract

The invention discloses a device for weakening charge at the upper part of a rock-soil blasting hole, and relates to the technical field of mine blasting. The device comprises a blast hole and a weakening charging device, the weakening charging device is arranged on the upper side of the interior of the blast hole, the weakening charging device is filled with filling explosives, an explosive layer is arranged on the lower side of the interior of the blast hole, the weakening charging device is arranged on the upper side of the explosive layer and tightly attached to the explosive layer, and a first filling section is arranged on the upper portion of the weakening charging device. And the first filling section adopts a traditional filling mode, so that the effects of reducing the blasting flying stone effect, reducing the blasting top boulder yield and saving the explosive cost are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of mine blasting, and in particular relates to a device for weakening charge at the upper part of a rock and soil blasting blasthole. Background Art

[0002] In traditional rock and soil blasting, coupled charging is used from bottom to top, and the upper part is filled in the traditional way. In order to prevent harmful effects of blasting such as blasting scattered objects, the filling length is often long, resulting in a high rate of large blocks on the top layer, affecting shoveling. If the filling length is too short, it is easy to produce flying rocks, and excessive waste of explosives, resulting in high blasting unit consumption and high costs.

[0003] Therefore, it is necessary to provide a device for weakening the charge on the upper part of the rock blasting hole, which is used in rock blasting construction to solve the problems of high cost, high bulk rate and low safety of traditional blasting. Summary of the invention

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The present invention is a device for weakening the charge on the upper part of a blasthole for rock and soil blasting, comprising a blasthole and a weakening charge device, wherein the weakening charge device is arranged on the upper side of the blasthole, and the inside of the weakening charge device is filled with explosives, an explosive layer is arranged on the lower side of the blasthole, the weakening charge device is arranged on the upper side of the explosive layer, and the weakening charge device is tightly fitted with the explosive layer, a first filling section is arranged on the upper part of the weakening charge device, and the first filling section cooperates with the upper side of the inner wall of the blasthole.

[0006] By setting up a device to weaken the charge, the flying rock effect of blasting is reduced, the rate of large pieces at the top of the blasting is reduced, and the cost of explosives is saved. It effectively solves the disadvantages of high cost, high rate of large pieces, and low safety of traditional blasting, avoids safety accidents and the phenomenon of affecting the shoveling of gravel, and ensures the stable development of mine blasting operations.

[0007] Preferably, the second filling sections are provided on both the left and right sides of the charge weakening device, and the second filling sections cooperate with the inner wall of the blast hole.

[0008] Preferably, the charge weakening device is made of cardboard. By using cardboard to make the charge weakening device, it is convenient to adjust the size according to the actual blasting aperture, adapt to blasting operations with different apertures, effectively improve the use effect of the charge weakening device, and expand the scope of use.

[0009] Preferably, both the first filling section and the second filling section are filled by a conventional filling method.

[0010] The present invention has the following beneficial effects:

[0011] The invention reduces the flying stone effect of blasting, reduces the large block rate of blasting top, and saves the cost of explosives by setting a charge weakening device, effectively solves the disadvantages of high cost, high large block rate, and low safety of traditional blasting, avoids safety accidents and the phenomenon of affecting the shoveling of crushed stones, and ensures the stable development of mine blasting operations;

[0012] The charge weakening device is made of cardboard material, which is convenient for adjusting the size according to the actual blasting hole diameter and adapting to blasting operations of different hole diameters. It effectively improves the use effect of the charge weakening device and expands its scope of use.

[0013] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the effect of using a charge weakening device in an embodiment of the present invention;

[0016] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0017] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0018] 1. Blast hole; 2. Weakening charge device; 3. Explosive loading; 4. Explosive layer; 5. First filling section; 6. Second filling section. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0021] See also Figure 1-Figure 2 As shown, the present invention is a device for weakening the charge on the upper part of a blasthole for rock and soil blasting, comprising a blasthole 1 and a weakening charge device 2, wherein the weakening charge device 2 is arranged on the upper side of the blasthole 1, and the weakening charge device 2 is filled with explosive 3, an explosive layer 4 is arranged on the lower side of the blasthole 1, the weakening charge device 2 is arranged on the upper side of the explosive layer 4, and the weakening charge device 2 is tightly fitted with the explosive layer 4, a first filling section 5 is arranged on the upper part of the weakening charge device 2, and the first filling section 5 cooperates with the upper side of the inner wall of the blasthole 1.

[0022] By setting up the charge weakening device 2, the flying rock effect of blasting is reduced, the rate of large pieces at the blasting top is reduced, and the cost of explosives is saved. The disadvantages of high cost, high rate of large pieces and low safety of traditional blasting are effectively solved, and safety accidents and the phenomenon of affecting the shoveling of crushed stone are avoided, thus ensuring the stable development of mine blasting operations.

[0023] The second filling section 6 is provided on both sides of the weakening charge device 2. The second filling section 6 cooperates with the inner wall of the blast hole 1. The first filling section 5 and the second filling section 6 are filled by a traditional filling method.

[0024] The charge weakening device 2 is made of cardboard. By using cardboard to make the charge weakening device 2, it is easy to adjust the size according to the actual blasting aperture and adapt to the actual size of the blasthole 1 so as to adapt to blasting operations of different apertures, thereby effectively improving the use effect of the charge weakening device 2 and expanding the scope of use.

[0025] Example:

[0026] Take the common open-pit mine blasting with a blast depth of 150mm and a platform height of 12m as an example:

[0027] Conventional blasting parameters:

[0028] Platform height: H = 12M;

[0029] Diameter of blasthole 1: 150mm;

[0030] Hole depth: L = 13.7m (10%-15% over-depth, take 1.7m);

[0031] Filling length: L1 = 3.7m (15-20 times the aperture, take 3.7m);

[0032] Charge depth: L2 = 10m;

[0033] Charge amount per linear meter: about 15kg (emulsion explosive, determined by the density of explosive);

[0034] Single hole charge: 150kg;

[0035] Blasting parameters after using weakened charge device 2:

[0036] Platform height: H = 12M;

[0037] Diameter of blasthole 1: 150mm;

[0038] Dimensions of the weakening charge 2: 90 mm in diameter, 1.5 m in length;

[0039] Hole depth: L = 13.7m (10%-15% over-depth, take 1.7m);

[0040] Upper coupling filling length: L1 = 3.2m (15-20 times the aperture, take 3.7m);

[0041] Bottom coupling charge depth: L2 = 9m;

[0042] The charge amount per linear meter of the weakening device is about 5kg (emulsion explosive, determined by the density of explosive);

[0043] The charge amount of coupled charge per linear meter: about 15kg (emulsion explosive, determined by the density of explosive);

[0044] Single hole charge: 142.5kg;

[0045] By comparing the conventional blasting parameters with the blasting parameters after using the reduced charge device 2 in the above embodiment, it is found that 7.5 kg of explosives can be saved per hole;

[0046] The specific size of the charge weakening device 2 can be flexibly adjusted according to the blasting method and the actual aperture of the blasting hole 1.

[0047] It should be further explained that the installation structure, connection method or setting method of each component in the present invention are all common mechanical methods, and can be implemented as long as they can achieve their beneficial effects.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for reducing the charge on the top of a blasthole for rock blasting, comprising a blasthole (1) and a device for reducing the charge (2), characterized in that: The weakening charge device (2) is arranged on the upper side of the blast hole (1), and the inside of the weakening charge device (2) is filled with explosive (3). An explosive layer (4) is arranged on the lower side of the blast hole (1). The weakening charge device (2) is arranged on the upper side of the explosive layer (4), and the weakening charge device (2) and the explosive layer (4) are tightly fitted. A first filling section (5) is arranged on the upper part of the weakening charge device (2), and the first filling section (5) cooperates with the upper side of the inner wall of the blast hole (1).

2. A device for weakening the charge at the top of a rock blasting hole according to claim 1, characterized in that: The second filling section (6) is provided on both the left and right sides of the weakened charge device (2), and the second filling section (6) cooperates with the inner wall of the blast hole (1).

3. A device for weakening the charge at the top of a rock blasting hole according to claim 2, characterized in that: The charge weakening device (2) is made of cardboard.

4. A device for weakening the charge at the top of a rock blasting hole according to claim 3, characterized in that: The first filling section (5) and the second filling section (6) are both filled using a conventional filling method.

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