Blast hole buffer charging device capable of preventing top rock from being cracked

Abstract

The utility model relates to the field of surface blasting, in particular to a blast hole buffer charging device capable of preventing top rock tension fracture, which comprises a blast hole, a charging section and a filling section are arranged in the blast hole, the filling section is positioned above the charging section, an initiating explosive package is arranged in the charging section and is connected with a primer detonator leg wire, and the primer detonator leg wire is connected with the charging section. The tail end of the primer detonator leg wire penetrates through the filling section and extends out of a blast hole opening, a buffer charging device is arranged at the bottom of the filling section and comprises an explosion propagation section and an energy gathering section, the top of the explosion propagation section is in threaded connection with the bottom end of the energy gathering section, an energy gathering groove is formed in the outer side of the energy gathering section, and a top cover is arranged at the top end of the energy gathering section. According to the utility model, the uniformity of rear-row blasting in a front amplitude blasting area is improved, and the working environment of a rear amplitude blasting area is improved.

Description

Technical Field

[0001] The utility model relates to the field of open-pit blasting, and particularly relates to a buffer charging device for blast holes to prevent the top rock from being cracked. Background Technique

[0002] In the bench drilling and blasting project of open-pit mines, the neatness of the slope surface of the rear blasting area after blasting is an important assessment standard for project quality, and the neatness of the slope surface of the rear blasting area is determined by the blasting quality of the last row of blast holes in the front blasting area. Serious cracking of the last row of blast holes in the front blasting area will lead to the development of internal joint fissures in the rocks of the rear blasting area, and even form through fissures, resulting in the loss of explosive energy from the through fissures and reducing the efficiency of doing work on the rocks, and forming oversize blocks cut along the joint surface. At the same time, serious cracking in the rear row will increase the construction difficulty of the stripping team, easily form eaves, affect the size of the resistance line of the front row of drill holes in the rear blasting area, and also affect the blasting quality of the rear blasting area. Content of the Utility Model

[0003] In view of the above problems, the utility model provides a buffer charging device for blast holes to prevent the top rock from being cracked, which improves the neatness of the rear row blasting in the front blasting area and improves the working environment of the rear blasting area.

[0004] To achieve the above object, the technical solution provided by the utility model is: a buffer charging device for blast holes to prevent the top rock from being cracked, including a blast hole, the inside of the blast hole includes a charging section and a stemming section, the stemming section is located above the charging section, an initiating explosive charge is arranged in the charging section, the initiating explosive charge is connected with the initiating detonator leg wire, the end of the initiating detonator leg wire passes through the stemming section and extends out of the blast hole orifice, a buffer charging device is arranged at the bottom of the stemming section, the buffer charging device includes a booster section and a shaped charge section, the top of the booster section is threadedly connected with the bottom end of the shaped charge section, a shaped charge groove is arranged on the outer side of the shaped charge section, and a top cover is arranged at the top end of the shaped charge section.

[0005] As a further scheme of the utility model: the charging section is filled with ammonium nitrate fuel oil explosive, and the initiating explosive charge is located at the bottom of the charging section.

[0006] As a further scheme of the utility model: the booster section is in a thin tubular shape, an emulsion cartridge is arranged in the booster section, the shaped charge section is in a cylindrical shape with a shaped charge groove, and bulk explosive is arranged in the shaped charge section.

[0007] As a further scheme of the utility model: the opening of the shaped charge groove faces the direction of rock stripping.

[0008] As a further scheme of the utility model: the height ratio of the stemming section and the charging section can be adjusted.

[0009] As a further solution of the utility model: the buffer charging device is used for the blasting in the front blasting area. A number of blast holes are arranged at intervals in the front blasting area, and the buffer charging device is arranged in the blast holes close to the rear blasting area.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0011] 1. By installing the buffer charging device, the utility model utilizes the shaped charge effect to concentrate the energy of the top explosive to do work on the peeled rock, reduce the disturbance and damage to the reserved slope surface, create a good bench environment for the blasting in the rear blasting area, and form a virtuous cycle.

[0012] 2. The utility model can distribute the explosives in the blast holes more reasonably, make the release of the explosion energy more uniform, reduce the over-excavation damage to the slope surface caused by the concentration of the amount of explosives in the middle and lower parts, increase the amount of explosives in the upper part to overcome the occurrence of the canopy, and improve the flatness of the slope surface formed after blasting.

[0013] 3. The buffer charging device of the utility model adopts an assembled connection, which is convenient for quick construction and improves the construction speed. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the structure of the buffer charging device in the utility model;

[0016] In the figure: 1, blast hole; 2, charging section; 3, stemming section; 4, priming charge; 5, detonator leg wire; 6, buffer charging device; 7, booster section; 8, shaped charge section; 9, shaped charge groove; 10, top cover; 11, ammonium nitrate fuel oil explosive; 12, emulsion cartridge; 13, bulk explosive; 14, front blasting area; 15, rear blasting area. Detailed Embodiment

[0017] Next, the technical solutions in the embodiments of the utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the utility model without creative efforts shall fall within the protection scope of the utility model.

[0018] Refer to Figures 1 to 2, an anti-top-rock-cracking buffer charge device for blast holes, comprising a blast hole 1. The interior of the blast hole 1 includes a charge section 2 and a stemming section 3. The stemming section 3 is located above the charge section 2. An initiating explosive package 4 is provided in the charge section 2. The initiating explosive package 4 is connected to the initiating blasting cap leg wire 5. The end of the initiating blasting cap leg wire 5 passes through the stemming section 3 and extends out of the orifice of the blast hole 1. It is characterized in that: a buffer charge device 6 is provided at the bottom of the stemming section 3. The buffer charge device 6 includes a booster section 7 and a shaped charge section 8. The top of the booster section 7 is threadedly connected to the bottom end of the shaped charge section 8. A shaped charge groove 9 is provided on the outer side of the shaped charge section 8. A top cover 10 is provided at the top end of the shaped charge section 8.

[0019] The charge section 2 is filled with ammonium nitrate fuel oil explosive 11, and the initiating explosive package 4 is located at the bottom of the charge section 2.

[0020] The booster section 7 is a thin tube. The booster section 7 is filled with emulsion cartridges 12. The emulsion cartridges 12 have a smaller critical explosion diameter and a more stable detonation wave transmission, and play a role in transmitting the detonation wave of the charge section 2 to the shaped charge section 8. The shaped charge section 8 is a cylindrical shape with a shaped charge groove 9. The shaped charge section 8 is filled with bulk explosive 13.

[0021] The opening of the shaped charge groove 9 faces the direction of rock peeling, playing a shaped charge effect, gathering the explosion energy in the direction of rock peeling, and increasing the force for crushing and pushing the upper rock forward.

[0022] The height ratio of the stemming section 3 and the charge section 2 can be adjusted.

[0023] The buffer charge device 6 is used in the blasting of the front blasting area 14. A number of blast holes 1 are arranged at intervals in the front blasting area 14. The buffer charge device 6 is arranged in the blast hole 1 close to the rear blasting area 15.

[0024] Working principle: In the blast hole 1 close to the rear blasting area 15, the buffer charge device 6 is loaded. Since the booster section 7 is a thin tube and is filled with emulsion cartridges 12 with a smaller critical explosion diameter and a more stable detonation wave transmission, it plays a role in transmitting the detonation wave of the charge section 2 to the shaped charge section 8. Since the shaped charge section 8 is a cylindrical shape with a shaped charge groove 9 on the side and is filled with bulk explosive 13, and the shaped charge groove 9 faces the direction of rock peeling, it plays a shaped charge effect, gathering the explosion energy in the direction of rock peeling, increasing the force for crushing and pushing the upper rock forward, avoiding the occurrence of overhanging eaves, while weakening the damage to the reserved rock of the rear bench, reducing the cracking of the rear blasting area 15, and providing a good blasting bench environment for it.

[0025] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A blasthole buffer charging device for preventing top rock cracking, comprising a blasthole (1), wherein the blasthole (1) comprises a charging section (2) and a filling section (3), wherein the filling section (3) is located above the charging section (2), wherein an explosive package (4) is arranged in the charging section (2), wherein the explosive package (4) is connected to a detonator leg wire (5), wherein the end of the detonator leg wire (5) passes through the filling section (3) and extends out of the blasthole (1) orifice, wherein: A buffer charge device (6) is provided at the bottom of the filling section (3), and the buffer charge device (6) comprises an explosion transmission section (7) and an energy gathering section (8). The top of the explosion transmission section (7) is threadedly connected to the bottom of the energy gathering section (8), an energy gathering groove (9) is provided on the outside of the energy gathering section (8), and a top cover (10) is provided at the top of the energy gathering section (8).

2. The top rock cracking prevention blasthole buffer charging device according to claim 1 is characterized by: The charge section (2) is filled with ammonium oil explosive (11), and the detonating charge package (4) is located at the bottom of the charge section (2).

3. The top rock cracking prevention blasthole buffer charging device according to claim 2 is characterized by: The detonation transmission section (7) is in the shape of a thin tube, and contains an emulsified drug roll (12). The energy focusing section (8) is in the shape of a cylinder with an energy focusing groove (9), and contains bulk explosive (13).

4. The top rock cracking prevention blasthole buffer charging device according to claim 3 is characterized by: The opening of the energy-gathering groove (9) faces the direction of rock peeling.

5. The top rock cracking prevention blasthole buffer charging device according to claim 4 is characterized by: The height ratio of the filling section (3) and the charge section (2) can be adjusted.

6. The top rock cracking prevention blasthole buffer charging device according to claim 4 is characterized by: The buffer charge device (6) is used in blasting a front blasting area (14), wherein the front blasting area (14) is provided with a plurality of blast holes (1) at intervals, and the buffer charge device (6) is arranged in a blast hole (1) close to a rear blasting area (15).

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