Blast hole blocking device and using method

Abstract

The invention discloses a blasthole blocking device and a using method, the blasthole blocking device is applied to a blocking section of a blasthole, and the blasthole blocking device comprises a bearing assembly and a blocking rod; the bearing assembly comprises a base and a middle shaft rod, the base is connected with the middle shaft rod, and when the bearing assembly is located in the blocking section, the central axis of the middle shaft rod is parallel to or coincides with the central axis of the blocking section; the blocking rods are arranged on the middle shaft rod, the multiple blocking rods are arranged in the axial direction of the middle shaft rod, the projections of the multiple blocking rods on the base form included angles, and the included angles are larger than 0 degree; when the bearing assembly is located on the blocking section, the base and the blocking rod define a blocking space in the blocking section.

Description

Technical Field

[0001] The present application relates to the field of geotechnical engineering technology, and more specifically, to a blasthole plugging device and a method of using the same. Background Art

[0002] Drilling and blasting is the main method of rock excavation. In the drilling and blasting construction, blasthole blocking is a key link. Good blasthole blocking can not only prolong the action time of blasting gas and improve the rock breaking effect, but also effectively reduce the risk of flying rocks during blasting.

[0003] In order to obtain local materials and facilitate construction, drilling cuttings are often used to plug holes in actual construction. Drilling cuttings are typical granular materials, and the plugging structure they form is relatively loose. They are easily compressed and deformed under the action of detonation products, and the effective plugging length is correspondingly reduced. In addition, their overall strength is low, and they are prone to local damage, causing detonation products to leak out from the local damage position in advance, reducing the rock breaking time of detonation products, which will not only seriously affect the blasting effect, but also increase the construction cost.

[0004] Therefore, how to improve the plugging effect of blastholes is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] An object of the present application is to provide a new technical solution for a blasthole plugging device.

[0006] According to the first aspect of the present application, a blasthole plugging device is provided. The blasthole plugging device is applied to the plugging section of the blasthole, and the blasthole plugging device includes a supporting assembly and a blocking rod; the supporting assembly includes a base and a central axis rod, the base is connected to the central axis rod, and when the supporting assembly is located in the plugging section, the central axis of the central axis rod is parallel to or coincides with the central axis of the plugging section; the blocking rod is arranged on the central axis rod, and a plurality of the blocking rods are arranged along the axial direction of the central axis rod, and the projections of the plurality of blocking rods on the base form an angle with each other, and the angle is greater than 0°; wherein, when the supporting assembly is located in the plugging section, the base and the blocking rod enclose a blocking space in the plugging section.

[0007] Optionally, the blocking rod is obliquely arranged on the central axis rod, and the angle formed by the blocking rod and the central axis rod is 30° to 60°.

[0008] Optionally, in a plane perpendicular to the axial direction of the central shaft, an angle between projections of adjacent barrier bars is 30° to 60°.

[0009] Optionally, a distance between a barrier bar adjacent to the base and the base is greater than a distance between adjacent barrier bars.

[0010] Optionally, the spacing between the barrier bars adjacent to the base and the base is 30 mm to 40 mm, and the spacing between adjacent barrier bars is 15 mm to 30 mm.

[0011] Optionally, the length of the central axis rod is greater than the depth of the blocking section, and the central axis rod has a connecting cavity opened along the axial direction, and the connecting cavity is connected to the charging section of the blast hole.

[0012] Optionally, the base is made of flexible material, and the central axis and the barrier rod are made of iron or steel.

[0013] According to the second aspect of the present application, a method for using a blasthole plugging device is provided, and the method for using the blasthole plugging device as described above is applied, and the method for using is as follows: S1: drilling a hole according to a blasting design, and loading explosives into the charging section of the blasthole to complete charging; S2: installing the blasthole plugging device into the blocking section of the blasthole, with the base located at the bottom of the blocking section, and the central axis of the central axis rod being parallel to or coincident with the central axis of the blocking section; S3: filling the blocking space with gravel to complete the blasthole plugging.

[0014] Optionally, the crushed stones filled in the blocking space include primary crushed stones, secondary crushed stones and tertiary crushed stones, the primary crushed stones account for 20% by weight, the secondary crushed stones account for 60% by weight, and the tertiary crushed stones account for 20% by weight.

[0015] Optionally, the first-level crushed stone has a particle size of 15 to 20 mm, the second-level crushed stone has a particle size of 10 to 15 mm, and the third-level crushed stone has a particle size of 5 to 10 mm.

[0016] When using the blasthole plugging device provided in the present application, a supporting assembly with a plurality of blocking rods is placed into the blocking section of the blasthole, and a base and a plurality of blocking rods arranged along the axial direction of the central axis form a blocking space in the blocking section, and blocking materials are placed into the blocking space. Under the constraint of the blocking rods and the blasthole wall that are staggered in space, the movement of the blocking materials is mutually hindered to form an interlocking structure, and the blocking materials cooperate with the blocking rods to limit the axial movement of the supporting assembly, and the lateral deformation tendency of the blocking materials is increased, thereby increasing the squeezing force and friction force between the blasthole plugging device and the blasthole wall, effectively delaying the explosion products from rushing out of the blasthole, prolonging the rock breaking time of the explosion products, and effectively improving the rock crushing effect.

[0017] It can be seen that the blast hole plugging device provided in the present application has a simple structure, low preparation or procurement cost, easy operation, and can effectively improve construction efficiency. The plugging material can be selected from the common gravel at the construction site, which is convenient for local materials and effectively reduces construction costs. The blast hole plugging device can extend the rock breaking time of the detonation products, which can not only improve the plugging quality and effectively improve the blasting effect, but also improve the construction safety.

[0018] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0020] Figure 1 is a schematic structural diagram of a blasthole plugging device in an embodiment of the present application;

[0021] Figure 2 is a schematic top view of a blasthole plugging device in an embodiment of the present application;

[0022] Figure 3 It is a schematic diagram of the completed charge in S1;

[0023] Figure 4 It is a schematic diagram of the blasthole plugging device in S2 being placed into the plugging section;

[0024] Figure 5 It is a schematic diagram of completing the blast hole plugging in S3.

[0025] Description of reference numerals:

[0026] 1-supporting assembly; 11-base; 12-central shaft; 121-communication cavity;

[0027] 2-blocking rod; 21-blocking space; 22-first blocking rod;

[0028] 3-blocking section;

[0029] 4-Charging section. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0033] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0034] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] According to one embodiment of the present application, a blasthole plugging device is provided, which is applied to the plugging section 3 of the blasthole, and the blasthole plugging device includes a supporting assembly 1 and a blocking rod 2; the supporting assembly 1 includes a base 11 and a central axis 12, the base 11 is connected to the central axis 12, and when the supporting assembly 1 is located in the plugging section 3, the central axis of the central axis 12 is parallel to or coincides with the central axis of the plugging section 3; the blocking rod 2 is arranged on the central axis 12, and a plurality of the blocking rods 2 are arranged along the axial direction of the central axis 12, and the projections of the plurality of blocking rods 2 on the base 11 form an angle with each other, and the angle is greater than 0°; wherein, when the supporting assembly 1 is located in the plugging section 3, the base 11 and the blocking rod 2 enclose the blocking space 21 in the plugging section 3.

[0036] like Figure 1 to Figure 2 As shown, the blasthole is columnar, the bottom of the blasthole is a charging section 4, and the end near the opening is a blocking section 3. By filling the blasthole blocking device into the blasthole blocking section 3, the explosives in the charging section 4 can be fully utilized in the blasthole, effectively improving the construction efficiency.

[0037] The support assembly 1 of the blasthole plugging device includes a base 11 and a central axis 12. The base 11 is plate-shaped or disc-shaped. The diameter of the base 11 is adapted to the diameter of the blasthole, and the thickness of the base 11 is 10 mm to 20 mm. By setting the base 11 to a size adapted to the blasthole, when the support assembly 1 is embedded in the blasthole, it can not only support the plugging material in the plugging section 3 through the base 11, but also increase the resistance of the support assembly 1 to move along the axial direction of the blasthole by stacking the plugging material on the base 11, reduce the impact of the support assembly 1 rushing out of the blasthole when it is impacted by the explosion of explosives, and delay the time of the detonation products in the blasthole.

[0038] The central axis rod 12 is columnar, and the diameter of the central axis rod 12 is smaller than the diameter of the base 11. One end of the central axis rod 12 and the base 11 can be detachably connected by threaded connection, interference fit, etc., or can be integrally formed.

[0039] The central axis rod 12 and the base 11 can be connected vertically or obliquely to adapt to blast holes with different inclinations on the bottom surface, increase the contact area between the base 11 and the blocking material, and strengthen the resistance to the movement of the supporting component 1 in the axial direction through the blocking material.

[0040] For example, the blast hole is columnar, the bottom of the blast hole blocking section 3 is perpendicular to the central axis of the blast hole, the central axis rod 12 is vertically connected to the base 11, the base 11 is in contact with the bottom of the blast hole blocking section 3, and the central axis of the central axis rod 12 is parallel to or coincides with the central axis of the blast hole blocking section 3.

[0041] For another example, the blast hole is columnar, the bottom of the blast hole blocking section 3 is inclined, the central axis rod 12 is obliquely connected to the base 11, the base 11 is in contact with the bottom of the blast hole blocking section 3, and the central axis of the central axis rod 12 is parallel to or coincides with the central axis of the blast hole blocking section 3.

[0042] like Figure 1 to Figure 2 As shown, the blocking rod 2 is columnar, the middle of the blocking rod 2 is connected to the central axis 12, and multiple blocking rods 2 are arranged along the axial direction of the central axis 12, that is, when the blast hole plugging device is set in the plugging section 3 of the blast hole, multiple blocking rods 2 are arranged along the axial direction of the blast hole. The projection of multiple blocking rods 2 on the base 11 is greater than 0°, so that the base 11 and the blocking rods 2 are enclosed in the blast hole plugging section 3 to form a blocking space 21.

[0043] The blasthole plugging device is placed in the plugging section 3, and the blocking material is filled into the blocking space 21. When the explosives in the charging section 4 explode, the blocking rod 2 can block the plugging material filled in the blasthole plugging section 3, delaying the detonation products from rushing out of the blasthole, effectively prolonging the rock breaking time of the detonation products, and improving the rock crushing effect.

[0044] The blocking material can be made of gravel commonly found at the construction site, which is convenient for local material acquisition and has low construction costs.

[0045] When using the blasthole plugging device provided in the present application, the supporting assembly 1 with multiple blocking rods 2 is placed in the blocking section 3 of the blasthole, and the base 11 and the multiple blocking rods 2 arranged along the axial direction of the central axis 12 form a blocking space 21 in the blocking section 3. The blocking material is put into the blocking space 21. Under the constraint of the blocking rods 2 and the blasthole wall that are staggered in space, the movement of the blocking materials is mutually hindered to form an interlocking, and the blocking material cooperates with the blocking rods 2 to limit the axial movement of the supporting assembly 1, and the tendency of the lateral deformation of the blocking material is increased, thereby increasing the squeezing force and friction between the blasthole plugging device and the blasthole wall, effectively delaying the explosion products from rushing out of the blasthole, prolonging the rock breaking time of the explosion products, and effectively improving the rock crushing effect.

[0046] It can be seen that the blast hole plugging device provided in the present application has a simple structure, low preparation or procurement cost, easy operation, and can effectively improve construction efficiency. The plugging material can be selected from the common gravel at the construction site, which is convenient for local materials and effectively reduces construction costs. The blast hole plugging device can extend the rock breaking time of the detonation products, which can not only improve the plugging quality and effectively improve the blasting effect, but also improve the construction safety.

[0047] In one example, the barrier rod 2 is obliquely disposed on the central axis rod 12, and the angle formed by the barrier rod 2 and the central axis rod 12 is 30° to 60°.

[0048] like Figure 1 to Figure 2 As shown, multiple barrier rods 2 are evenly arranged along the axial direction of the central axis 12, and each barrier rod 2 is tilted on the central axis 12, and the angle formed by the barrier rod 2 and the central axis 12 is 30° to 60°, preferably 30°. By tilting multiple barrier rods 2, a shielding from the base 11 to the blasthole opening is formed in the blocking space 21, which can not only effectively delay the explosion products from rushing out of the blasthole, prolong the rock breaking time of the explosion products, and improve the rock crushing effect, but also reduce the impact force of the explosion products when they rush out of the blasthole, improve the safety of the explosion products, and effectively reduce the dust of the explosion products, reducing the impact on the construction environment.

[0049] The barrier rod 2 is columnar, for example, the diameter of the blasthole is 100 mm, the length of the barrier rod 2 is 104 mm, the diameter of the barrier rod 2 is 5 mm to 15 mm, the barrier rod 2 is obliquely arranged on the central axis 12, and the length of the barrier rod 2 when projected to a plane perpendicular to the central axis 12 is 10 mm to 30 mm less than the diameter of the blasthole.

[0050] In one example, in a plane perpendicular to the axial direction of the central shaft 12 , the angle between the projections of adjacent barrier bars 2 is 30° to 60°.

[0051] like Figure 1 to Figure 2 As shown, the central shaft 12 is vertically connected to the base 11, and a plurality of barrier rods 2 are arranged along the axial direction of the central shaft 12. The included angle formed by the projections of adjacent barrier rods on the base 11 is 30° to 60°, preferably 45°.

[0052] By staggering the projections of multiple barrier rods 2 on the base 11, the blocking material can be blocked when it rushes out of the blasthole along the inner wall of the blasthole. Under the restraining effect of the staggered barrier rods 2 and the blasthole wall, the movement of the blocking materials is mutually hindered to form an interlocking, and the axial movement of the blasthole blocking device is restricted, which increases the lateral deformation tendency of the blocking material, thereby increasing the squeezing force and friction between the blasthole blocking device and the blasthole wall, effectively delaying the explosion products from rushing out of the blasthole, prolonging the rock breaking time of the explosion products, and significantly improving the rock crushing effect.

[0053] In one example, the distance between the barrier bars 2 adjacent to the base 11 and the base 11 is greater than the distance between adjacent barrier bars 2 .

[0054] like Figure 1 to Figure 2 As shown, the bottom of the central axis 12 is connected to the base 11, and a plurality of blocking rods 2 are evenly arranged in the axial direction on the central axis 12. The blocking rod 2 located at the bottom of the central axis 12 and close to the base 11 is the first blocking rod 22, and the distance between the first blocking rod 22 and the base 11 is greater than the distance between adjacent blocking rods 2. By increasing the distance between the first blocking rod 22 and the base 11 so that more blocking material can be filled under the first blocking rod 22, not only the blocking effect of the first blocking rod 22 can be improved, but also the blocking material under the first blocking rod 22 can fully squeeze the base 12, thereby increasing the resistance of the support assembly 1 to rush out of the blast hole.

[0055] In one example, the spacing between the barrier bars 2 adjacent to the base 11 and the base 11 is 30 mm to 40 mm, and the spacing between adjacent barrier bars 2 is 15 mm to 30 mm.

[0056] like Figure 1 to Figure 2 As shown, the barrier rod 2 adjacent to the base 11 is a first barrier rod 22. The spacing between the first barrier rod 22 and the base 11 is greater than the spacing between adjacent barrier rods 2. For example, the spacing between the first barrier rods 22 is 30 mm to 40 mm, and the spacing between adjacent barrier rods 2 is 15 mm to 30 mm. By reducing the spacing between adjacent barrier rods 2, multiple barrier rods 2 can effectively block the blocking material in a limited space, delay the detonation products from rushing out of the blasthole, prolong the rock breaking time of the detonation products, and improve the rock crushing effect.

[0057] In one example, the length of the central axis rod 12 is greater than the depth of the blocking section 3, and the central axis rod 12 has a connecting cavity 121 opened along the axial direction, and the connecting cavity 121 is connected to the charging section 4 of the blast hole.

[0058] like Figure 1 to Figure 2 As shown, the length of the central axis rod 12 is greater than the depth of the blocking section 3. The central axis rod 12 is tubular, the top of the central axis rod 12 extends out of the blast hole, and the bottom is connected to the charge section 4, through the communication cavity 121 of the central axis rod 12 to facilitate ignition of the explosive in the charge section 4.

[0059] For example, the diameter of the blasthole is 100 mm, the depth is 8 m, the length of the blocking section 3 is 2.5 m, the length of the central axis rod 12 is 20-30 mm longer than the depth of the blocking section 3, the outer diameter of the central axis rod 12 is 10-20 mm, preferably 20 mm, and the thickness is 1-2 mm, preferably 1 mm. The base 11 has a diameter of 100 mm and a diameter of the middle hole of 20 mm. The central axis rod 12 is connected to the middle hole on the base 11, and the connecting cavity 121 is connected to the charging section 4 through the middle hole.

[0060] The central axis rod 12 and the base 11 can be connected by interference fit, threaded connection or the like, or can be integrally formed.

[0061] In one example, the base 11 is made of a flexible material, and the central axis 12 and the barrier rod 2 are made of iron or steel.

[0062] In the embodiment of the present application, the material of the base 11 can be rubber, plastic, or silicone. By selecting a flexible material to manufacture the base 11, when the supporting assembly 1 is placed on the blocking section 3 of the blast hole, the base 11 can better fit the shape of the bottom of the blocking section 3, thereby increasing the contact area between the blocking material and the bottom of the blocking section 3, and increasing the friction between the side wall of the base 11 and the side wall of the blast hole, thereby reducing the impact force of the blast hole blocking device rushing out of the blast hole.

[0063] By making the base 11 out of flexible materials, the problem of stuck holes can be effectively reduced, and the construction difficulty can be effectively reduced.

[0064] Of course, in the embodiment of the present application, the base 11 is not limited to the above materials, and those skilled in the art can set it according to actual needs. For example, the base 11 can also be made of a rigid material.

[0065] The central axis rod 12 and the barrier rod 2 are made of metal material, preferably iron or steel. By using rigid materials to manufacture the central axis rod 12 and the barrier rod 2, not only the bearing capacity of the central axis rod 12 and the barrier rod 2 can be effectively improved, but also the impact resistance of the barrier rod 2 can be effectively enhanced, thereby effectively blocking the blocking material.

[0066] According to another embodiment of the present application, a method for using a blasthole plugging device is provided, and the method for using the blasthole plugging device as described above is applied, and the method for using is as follows: S1. Drilling a hole according to the blasting design, and loading explosives into the charging section 4 of the blasthole to complete the charging; S2. Installing the blasthole plugging device into the blocking section 3 of the blasthole, with the base 11 located at the bottom of the blocking section 3, and the central axis of the central axis rod 12 being parallel to or coincident with the central axis of the blocking section 3; S3. Filling the blocking space 21 with gravel to complete the blasthole plugging.

[0067] like Figures 3 to 5As shown, in the first step, a blast hole is opened according to the blasting design, the bottom of the blast hole is a charging section 4, and the section from the charging section 4 to the opening of the blast hole is a blocking section 3. Explosives are filled into the charging section 4 to complete the charging.

[0068] In the second step, the blast hole plugging device of the present application is placed in the plugging section 3. The base 11 is made of rubber. The base 11 located in the plugging section 3 fits with the bottom of the plugging section 3, and the side wall of the base 11 fits with the side wall of the plugging section 3, increasing the friction between the bearing assembly and the inner wall of the blast hole. The central axis 12 is embedded in the blast hole, and the end of the central axis 12 away from the base 11 extends out of the blast hole plugging section 3, so as to ignite the explosive in the charge section 4 through the connecting cavity 121 of the central axis 12. The central axis of the central axis 12 coincides with the central axis of the blast hole, so that multiple blocking members are staggered with the central axis of the blast hole as the center, which can effectively block the plugging material.

[0069] For example, the diameter of the blasthole is 100 mm, the depth is 8 m, the charge section 4 is 5.5 m long, and the plugging section 3 is 2.5 m long. The length of the central axis rod 12 of the present application is 20 to 30 mm longer than the depth of the plugging section 3, the outer diameter of the central axis rod 12 is 20 mm, and the thickness is 1 mm. The base 11 has a diameter of 100 mm and a diameter of the middle hole of 20 mm. The central axis rod 12 is connected to the middle hole on the base 11, and the connecting cavity 121 is connected to the charge section 4 through the middle hole.

[0070] In the third step, the blasthole plugging device forms a blocking space 21 in the blocking section 3, and fills the blocking space 21 with a plugging material, which can be selected from common gravel at the construction site, so that it is convenient to obtain materials locally and has a low construction cost. The blasthole is plugged by filling the gravel.

[0071] In the embodiment of the present application, under the constraint of the space-staggered barrier rods 2 and the blasthole wall, the movement of the crushed stone particles is mutually hindered, forming an interlock, the axial movement of the blasthole plugging device is restricted, and the tendency of the lateral deformation of the crushed stone particles increases, thereby increasing the squeezing force and friction between the blasthole plugging device and the blasthole wall, effectively delaying the explosion products from rushing out of the blasthole, prolonging the rock breaking time of the explosion products, and significantly improving the rock crushing effect. Moreover, compared with the traditional drilling rock cuttings plugging method, the present application only adds one link of placing the blasthole plugging device, and the time required for this link is extremely short, the operation is convenient, and the construction efficiency is high.

[0072] In one example, the crushed stones filled in the blocking space 21 include primary crushed stones, secondary crushed stones and tertiary crushed stones, the primary crushed stones account for 20% by weight, the secondary crushed stones account for 60% by weight, and the tertiary crushed stones account for 20% by weight.

[0073] In the embodiment of the present application, the blocking materials filled into the blocking space 21 include primary crushed stone, secondary crushed stone and tertiary crushed stone. By selecting crushed stone of different levels for filling, the crushed stones can also have a blocking effect, further extending the rock breaking time of the detonation products and improving the rock crushing effect.

[0074] Of course, in the embodiment of the present application, the gravel is not limited to the above proportions, and those skilled in the art can set it according to actual needs.

[0075] In one example, the first-level crushed stone has a particle size of 15 to 20 mm, the second-level crushed stone has a particle size of 10 to 15 mm, and the third-level crushed stone has a particle size of 5 to 10 mm.

[0076] In the embodiment of the present application, gravels of different particle sizes are selected to fill the blocking space 21, so that the gravels of different particle sizes have a blocking effect, further prolonging the rock breaking time of the detonation products and improving the rock crushing effect.

[0077] Of course, in the embodiment of the present application, the crushed stone is not limited to the above-mentioned particle size, and those skilled in the art can set it according to actual needs.

[0078] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A blast hole plugging device, applied to the plugging section (3) of a blast hole, characterized in that: include: A supporting assembly (1), the supporting assembly (1) comprising a base (11) and a central axis rod (12), the base (11) being connected to the central axis rod (12), and when the supporting assembly (1) is located in the blocking section (3), the central axis of the central axis rod (12) is parallel to or coincides with the central axis of the blocking section (3); A barrier rod (2), wherein the barrier rod (2) is arranged on the central axis rod (12), and a plurality of the barrier rods (2) are arranged along the axial direction of the central axis rod (12), and projections of the plurality of barrier rods (2) on the base (11) form an angle with each other, and the angle is greater than 0°; Wherein, when the supporting assembly (1) is located in the blocking section (3), the base (11) and the blocking rod (2) are enclosed in the blocking section (3) to form a blocking space (21).

2. The blast hole plugging device according to claim 1, characterized in that: The barrier rod (2) is arranged obliquely on the central axis rod (12), and the angle formed by the barrier rod (2) and the central axis rod (12) is 30° to 60°.

3. The blast hole plugging device according to claim 1, characterized in that: In a plane perpendicular to the axial direction of the central shaft (12), the angle between the projections of adjacent barrier bars (2) is 30° to 60°.

4. The blast hole plugging device according to claim 1, characterized in that: The distance between the barrier bars (2) adjacent to the base (11) and the base (11) is greater than the distance between adjacent barrier bars (2).

5. The blast hole plugging device according to claim 4, characterized in that: The spacing between the barrier rod (2) adjacent to the base (11) and the base (11) is 30 mm to 40 mm, and the spacing between adjacent barrier rods (2) is 15 mm to 30 mm.

6. The blast hole plugging device according to claim 1, characterized in that: The length of the central axis rod (12) is greater than the depth of the blocking section (3), and the central axis rod (12) has a connecting cavity (121) opened in the axial direction, and the connecting cavity (121) is connected to the charging section (4) of the blast hole.

7. The blast hole plugging device according to claim 1, characterized in that: The base (11) is made of a flexible material, and the central axis (12) and the barrier rod (2) are made of iron or steel.

8. A method for using a blasthole plugging device, characterized in that: The blast hole plugging device according to any one of claims 1 to 7 is used, and the method of use is as follows: S1: drilling a hole according to the blasting design, and loading explosives into the charging section (4) of the blast hole to complete the charging; S2: The blasthole plugging device is placed in the plugging section (3) of the blasthole, the base (11) is located at the bottom of the plugging section (3), and the central axis of the central shaft (12) is parallel to or coincides with the central axis of the plugging section (3); S3: Filling the blocking space (21) with gravel to complete the blocking of the blasthole.

9. The method for using the blast hole plugging device according to claim 8, characterized in that: The crushed stones filled in the blocking space (21) include primary crushed stones, secondary crushed stones and tertiary crushed stones, wherein the primary crushed stones account for 20% by weight, the secondary crushed stones account for 60% by weight and the tertiary crushed stones account for 20% by weight.

10. The method for using the blast hole plugging device according to claim 9, characterized in that: The particle size of the first-level crushed stone is 15-20 mm, the particle size of the second-level crushed stone is 10-15 mm, and the particle size of the third-level crushed stone is 5-10 mm.

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