Spacer for blast hole charging

Abstract

The utility model discloses a spacer for blast hole charging, and relates to the technical field of blasting. According to the technical key points, the woven bag comprises a woven bag body, openings are formed in the upper end and the lower end of the woven bag body, and end cover plates are fixedly installed in the upper opening and the lower opening of the woven bag body; a soft air bag is arranged in the woven bag, and the upper end and the lower end of the soft air bag are fixedly connected with the sides, close to each other, of the two end cover plates respectively. A plurality of telescopic rod pieces are arranged in the soft air bag; a first container and a second container are arranged in the centers of the plurality of telescopic rod pieces, a first reactant and a second reactant are respectively filled in the first container and the second container, and the first reactant and the second reactant can react to generate gas after being contacted. The telescopic rod piece playing a connecting role between the two end cover plates can limit the displacement of the whole spacer in the circumferential direction of a blast hole, and therefore the deviation between the distance between explosives at the upper end and the lower end of the spacer and a design value is reduced.

Description

Technical Field

[0001] This application relates to the field of blasting technology, and particularly to a spacer for charging blast holes. Background Art

[0002] Traditional columnar continuous charging methods have disadvantages such as high explosive specific consumption, large blasting vibration, too high initial pressure of detonation wave, short action time of detonation gas, poor rock fragmentation effect, easy generation of large blocks and bottom roots, etc., which easily bring many problems such as blasting vibration hazards, low efficiency of shoveling and transportation, and low utilization rate of explosive energy. Engineering practice and simulation experiments have shown that using the axial interval charging method to replace continuous columnar charging can effectively overcome many disadvantages of continuous charging blasting.

[0003] For the axial interval charging method, the equipment commonly used on site to separate explosives is an air spacer. When in use, after placing the soft and elastic airbag at the designated position in the blast hole, pull the pull rope of the airbag outside the blast hole, and open the gas storage tank in the airbag through a series of transmission mechanisms connected to the pull rope, so that the gas in the gas storage tank is released. The released gas fills the entire soft airbag, so that the airbag can play a spacing effect on the explosives in the blast hole. This kind of airbag is not only troublesome to use, but also lacks a limiting component in the airbag to restrict its axial expansion along the blast hole. During the inflation process, in addition to expanding radially along the blast hole, the airbag will also expand axially along the blast hole, which easily causes the distance between the explosives at the upper and lower ends of the airbag to deviate from the designed value, thus affecting the final blasting effect. Summary of the Utility Model

[0004] This application provides a spacer for charging blast holes, which can effectively solve the problems existing in the existing air spacer during use in the background art.

[0005] The above object of this application is achieved through the following technical solutions:

[0006] A spacer for charging blast holes includes a woven bag. Openings are provided at both the upper and lower ends of the woven bag, and a head cover plate is fixedly installed in each of the upper and lower openings of the woven bag; a soft airbag is provided inside the woven bag, and the upper and lower ends of the soft airbag are fixedly connected to the mutually adjacent sides of the two head cover plates respectively;

[0007] A plurality of telescopic rod members are provided inside the soft airbag, and the upper and lower ends of the telescopic rod members are fixedly connected to the two head cover plates respectively; when the telescopic rod members are extended to the longest state, the distance between the two head cover plates is equal to the required interval height between two adjacent sections of explosives in the blast hole;

[0008] A first container and a second container are provided at the centers of multiple telescopic rod members. The bottom of the first container is mounted on the lower end head cover plate, and the second container is mounted directly above the first container through the multiple telescopic rod members. The first container and the second container are respectively filled with a first reactant and a second reactant, and the first reactant and the second reactant can react to produce gas after contact.

[0009] Further, the telescopic rod member includes a support sleeve, an inner telescopic rod, and a spring. The lower end of the support sleeve is fixedly mounted on the lower end head cover plate. The lower end of the inner telescopic rod penetrates downward through the upper end of the support sleeve and is inserted into the support sleeve. A limiting block is fixedly connected to the lower end of the inner telescopic rod. The diameter of the limiting block is greater than the diameter of the hole in the upper end of the support sleeve for passing the inner telescopic rod and is equal to the inner diameter of the support sleeve. The upper end of the inner telescopic rod is fixedly connected to the upper end head cover plate above.

[0010] The spring is disposed within the support sleeve, and the upper and lower ends of the spring are respectively fixedly connected to the limiting block and the lower end head cover plate.

[0011] Further, a first fixing ring is fixedly sleeved on the outer side of the second container. At the height corresponding to the first fixing ring on multiple inner telescopic rods, a second fixing ring is fixedly sleeved on each. Multiple first fixing rings are fixedly connected to the outer side wall of the first fixing ring through a connecting rod.

[0012] Further, an opening is provided at the lower end of the second container, and a sealing film is provided in the opening at the lower end of the second container. An opening is provided at the upper end of the first container, and a piercing unit is provided at the opening at the upper end of the first container. When the second container moves downward along with the inner telescopic rod, the piercing unit on the first container can pierce the sealing film on the second container to make the second reactant in the second container fall into the first container.

[0013] Further, the sealing film is an aluminum film, the first reactant is sodium bicarbonate powder, and the second reactant is aluminum sulfate solution.

[0014] Further, a water-soluble film is provided inside the upper port of the first container, and there is a gap between the water-soluble film and the top of the first container.

[0015] Further, the water-soluble film is a polyvinyl alcohol film.

[0016] Further, the piercing unit includes a piercing ring. Multiple piercing teeth are evenly arranged along the circumference above the piercing ring. The piercing ring is located directly below the first container, and its outer side wall is fixedly mounted at the center position of the upper end of the first container through a support rod.

[0017] Furthermore, a lifting rope is fixedly connected to the upper end head cover plate.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] When the spacer of the present application is in use, first place its whole body at the designated position in the blast hole, and then use a rod to press down the upper end head cover plate. The end head cover plate can simultaneously squeeze a plurality of telescopic rod members, so that the second reactant in the second container and the first reactant in the first container come into contact to generate a chemical reaction to produce gas. The generated gas will quickly fill the entire soft air bag. During the process of the soft air bag expanding, it will drive the outer woven bag to expand outward together, so as to block the blast hole where it is located, achieving the effect of spacing explosives in the blast hole, and it is simple and convenient to use. In addition, due to the telescopic rod members connecting the two end head cover plates of the present application, under the drive of the internal gas, after extending to the longest state, they are in a fixed state, and the distance between the two end head cover plates in this state is exactly equal to the required expected spacing height between adjacent two sections of explosives in the blast hole. In this way, a plurality of telescopic rod members can restrict the displacement of the entire spacer along the circumferential direction of the blast hole, preventing the expansion range from being too large due to lack of restriction at the upper and lower ends during the expansion process, resulting in a deviation between the spacing between the explosives at the upper and lower ends of the spacer and the design value, which affects the final blasting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is the overall structural schematic diagram of the present application;

[0022] Figure 2 is in Figure 1 After removing the woven bag on the basis of, the structural schematic diagram of the soft air bag of the present application being exposed;

[0023] Figure 3 is the cross-sectional view of the present application;

[0024] Figure 4 is the structural schematic diagram after removing the woven bag and the soft air bag of the present application;

[0025] Figure 5 is Figure 4 the enlarged structural schematic diagram of part A in;

[0026] Figure 6 In Figure 4 the structure schematic diagram after cutting open the support sleeve in one of the telescopic rod members on this basis.

[0027] Reference numerals: 1, woven bag; 2, end head cover plate; 3, soft air bag; 4, telescopic rod member; 41, support sleeve; 42, inner telescopic rod; 43, spring; 44, limit block; 5, first container; 6, second container; 7, first reactant; 8, second reactant; 9, first fixing ring; 10, second fixing ring; 11, connecting rod; 12, sealing film; 13, piercing unit; 131, piercing ring; 132, piercing teeth; 133, support rod; 14, water-soluble film; 15, lifting rope. Specific embodiments

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts also belong to the scope of protection of the present application.

[0029] As Figures 1-4 shown, a spacer for use in charging blast holes disclosed in the present application includes a woven bag 1. Both the upper and lower ends of the woven bag 1 are provided with openings, and an end head cover plate 2 is fixedly installed in each of the upper and lower openings of the woven bag 1; a soft air bag 3 is provided inside the woven bag 1, and the upper and lower ends of the soft air bag 3 are respectively fixedly connected to the mutually close sides of the two end head cover plates 2;

[0030] A plurality of telescopic rod members 4 are provided inside the soft air bag 3, and the upper and lower ends of the telescopic rod members 4 are respectively fixedly connected to the two end head cover plates 2; when the telescopic rod members 4 are extended to the longest state, the distance between the two end head cover plates 2 is equal to the required spacing height between two adjacent segments of explosives in the blast hole;

[0031] A first container 5 and a second container 6 are provided at the center of the plurality of telescopic rod members 4. The bottom of the first container 5 is installed on the lower end head cover plate 2, and the second container 6 is installed directly above the first container 5 through the plurality of telescopic rod members 4; a first reactant 7 and a second reactant 8 are respectively filled in the first container 5 and the second container 6, and the first reactant 7 and the second reactant 8 can react to generate gas after coming into contact.

[0032] In the above embodiments, the woven bag 1 provided outside the soft air bag 3 can not only protect the internal soft air bag 3 during transportation and storage, but also expand together with the soft air bag 3 when the soft air bag 3 expands, and form a tight contact with the inner wall of the blast hole after expansion.

[0033] The material of the soft airbag 3 can preferably be rubber material, which facilitates its expansion when filled with gas. A first container 5 and a second container 6 are provided inside the soft airbag 3. A first reactant 7 and a second reactant 8 are respectively placed in the first container 5 and the second container 6. When the upper end head cover plate 2 is squeezed and approaches the lower end head cover plate 2, the telescopic rod member 4 will contract synchronously. When the telescopic rod member 4 contracts, the second reactant 8 inside the second container 6 will come into contact with the first reactant 7 in the first container 5, thereby generating a chemical reaction. The gas generated by the reaction of the first reactant 7 and the second reactant 8 will quickly fill the soft airbag 3 until the soft airbag 3 blocks the blast hole, so that the explosive can be spaced in the blast hole, which is simple and convenient to use.

[0034] During the expansion process of the soft airbag 3, its circumferential side and the upper and lower parts expand outward simultaneously. When the circumferential side of the soft airbag 3 encounters the inner wall of the blast hole and is blocked, the upper and lower ends with less resistance will quickly expand, which will change the spacing distance between the explosive segments at the upper and lower ends of the spacer and affect the explosion effect.

[0035] In this application, the upper and lower ends of the woven bag 1 and the soft airbag 3 are respectively connected to two end head cover plates 2, and the two end head cover plates 2 are connected by a plurality of telescopic rod members 4. When the telescopic rod members 4 extend to the maximum state, they will be in a fixed state, and the distance between the two end head cover plates 2 in this state is exactly equal to the designed spacing height between two adjacent segments of explosives at the upper and lower ends of the spacer. In this way, the plurality of telescopic rod members 4 will limit the longitudinal position change of the woven bag during the expansion of the soft airbag 3 with the woven bag to prevent their excessive expansion along the axis of the blast hole, so as to ensure that the spacing distance between two adjacent segments of explosives at the upper and lower ends of the spacer is close to the designed value, thereby ensuring that the final explosion effect meets the expected value.

[0036] Furthermore, as Figures 3-6 shown, the telescopic rod member 4 includes a support sleeve 41, an inner telescopic rod 42 and a spring 43. The lower end of the support sleeve 41 is fixedly installed on the lower end head cover plate 2. The lower end of the inner telescopic rod 42 penetrates downward through the upper end of the support sleeve 41 and is inserted into the support sleeve 41, and a limit block 44 is fixedly connected to the lower end of the inner telescopic rod 42. The diameter of the limit block 44 is larger than the diameter of the hole for passing the inner telescopic rod 42 at the upper end of the support sleeve 41 and is equal to the inner diameter of the support sleeve 41; the upper end of the inner telescopic rod 42 is fixedly connected to the upper end head cover plate 2;

[0037] The spring 43 is arranged inside the support sleeve 41, and the upper and lower ends of the spring 43 are respectively fixedly connected to the limit block 44 and the lower end head cover plate 2.

[0038] In the above embodiments, the upper end of the support sleeve 41 is a closed structure, and the lower end of the support sleeve 41 is an open structure. A hole with the same diameter as the inner expansion rod 42 is provided at the central position of the upper end of the support sleeve 41. The lower end of the inner expansion rod 42 is inserted into the support sleeve 41 through this hole. The limiting block 44 connected to the lower end of the support sleeve 41 is circular, and the diameter of the limiting block 44 is equal to the inner diameter of the support sleeve 41 and larger than the lower end diameter of the inner expansion rod 42. In this way, when the inner expansion rod 42 extends along the vertical direction, the limiting block 44 cannot pass through the hole for the inner expansion rod 42 at the upper end of the support sleeve 41, thereby forming a limit on the inner expansion rod 42. In this way, when the inner expansion rod 42 extends along the axis of the blast hole to a certain extent during the expansion of the soft airbag 3, it will stop and be in a fixed state. The spring 43 of the present application is a compression spring, which can push the limiting block 44 to contact the lower side of the upper end of the support sleeve 41 in the natural state. In this way, the step of the gas in the soft airbag 3 pushing open the two end covers 2 can be omitted, thereby accelerating the expansion efficiency of the periphery of the soft airbag 3.

[0039] Further, as Figure 4 shown, a first fixing ring 9 is fixedly sleeved on the outer side of the second container 6, and a second fixing ring 10 is fixedly sleeved at the height corresponding to the first fixing ring 9 on each of the plurality of inner expansion rods 42. The plurality of first fixing rings 9 are fixedly connected to the outer side wall of the first fixing ring 9 through a connecting rod 11.

[0040] In the above embodiments, the first fixing ring 9 fixedly connected to the outer side of the second container 6 and the second fixing rings 10 on the plurality of inner expansion rods 42 are all connected through a connecting rod 11. In this way, when the plurality of inner expansion rods 42 move along the vertical direction, they will drive the second container 6 to move synchronously. After the explosive loading worker places the spacer in place, a hard rod (the hard rod can be a plastic rod, a metal rod or a wooden rod) is used to press the upper end cover 2 above. Through the upper end cover 2, the second container 6 can be driven by the plurality of inner expansion rods 42 to approach the first container 5, so as to add the second reactant 8 in the second container 6 into the first container 5.

[0041] Further, as Figure 3 shown, the lower end of the second container 6 is provided with an opening, a sealing film 12 is provided in the opening at the lower end of the second container 6, the upper end of the first container 5 is provided with an opening, and a piercing unit 13 is provided at the opening at the upper end of the first container 5. When the second container 6 moves downward along with the inner expansion rod 42, the piercing unit 13 on the first container 5 can pierce the sealing film 12 on the second container 6 to make the second reactant 8 in the second container 6 fall into the first container 5.

[0042] In the above embodiments, the opening at the lower end of the second container 6 is sealed with a sealing film 12. When the second container 6 moves towards the upper port of the first container 5 along with a plurality of inner telescopic rods 42, until the piercing unit 13 in the upper port of the first container 5 pierces the sealing film 12, the second reactant 8 in the second container 6 will automatically fall into the first container 5 under the action of gravity and come into contact with the first reactant 7 in the first container 5 to undergo a chemical reaction, thereby generating a gas that can inflate the entire soft airbag 3, which is very convenient to use.

[0043] Further, as Figure 3 shown, the sealing film 12 is an aluminum film, the first reactant 7 is sodium bicarbonate powder, and the second reactant 8 is an aluminum sulfate solution.

[0044] In the above embodiments, the lower port of the second container 6 of the present application is sealed with an aluminum film, which is not only convenient for processing and production, but also has good sealing effect, high temperature and acid-base resistance, and stable state during use, and it is also very convenient to open with the piercing unit 13 later. The aluminum sulfate solution is filled in the second container 6. After the aluminum film is pierced, the aluminum sulfate solution can flow out quickly. The flowing aluminum sulfate solution will come into contact with the sodium bicarbonate powder in the first container 5, and the two will react to generate a large amount of carbon dioxide gas, thereby inflating the soft airbag 3.

[0045] Further, as Figure 3 shown, a water-soluble film 14 is provided in the upper port of the first container 5, and there is a gap between the water-soluble film 14 and the top of the first container 5.

[0046] In the above embodiments, the water-soluble film 14 provided in the upper port of the first container 5 can protect the sodium bicarbonate powder in the first container 5 during the transportation and storage of the spacer. When the first reactant 7, the aluminum sulfate solution, in the second container 6 drops, the water-soluble film 14 can be quickly dissolved, so as to come into contact and react with the sodium bicarbonate powder in the first container 5.

[0047] Further, the water-soluble film 14 is a polyvinyl alcohol film.

[0048] In the above embodiments, the polyvinyl alcohol film, also known as PVA, not only belongs to a green and environmentally friendly material, but also has good toughness and high tensile strength, so it can well protect the sodium bicarbonate powder in the first container 5 and can be dissolved in water at room temperature. When the aluminum sulfate solution falls on the polyvinyl alcohol film, since the aluminum sulfate solution contains a large amount of water, the upper port of the first container 5 can be opened by dissolving the polyvinyl alcohol film, so that the aluminum sulfate solution can come into contact and react with the sodium bicarbonate powder.

[0049] Further, as Figure 4 and Figure 5As shown, the piercing unit 13 includes a piercing ring 131. Above the piercing ring 131, a plurality of piercing teeth 132 are evenly arranged circumferentially. The piercing ring 131 is located directly below the first container 5, and its outer wall is fixedly installed at the central position of the upper end of the first container 5 through a support rod 133.

[0050] In the above embodiment, the inner diameter of the first container 5 is greater than the outer diameter of the second container 6. The outer diameter of the piercing ring 131 arranged in the middle of the upper port of the first container 5 is smaller than the diameter of the aluminum film on the second container 6. When the second container 6 moves downward along with the plurality of inner telescopic rods 42 until the aluminum film contacts the piercing ring 131, the piercing teeth 132 on the piercing ring 131 will pierce the middle of the aluminum film to generate a hole, so that the aluminum sulfate liquid in the second container 6 can quickly drain into the first container 5. Since there are a plurality of piercing teeth 132 on the piercing ring 131, the probability of the aluminum film being pierced and the area where the aluminum film is pierced can be increased, and the drainage efficiency of the aluminum sulfate solution in the second container 6 can be accelerated.

[0051] Furthermore, as Figure 1 and Figure 2 shown, a lifting rope 15 is fixedly connected to the upper end head cover plate 2.

[0052] In the above embodiment, the lifting rope 15 on the upper end head cover can be used by workers to lower the entire spacer to a suitable position in the blast hole. The lifting rope 15 can use ordinary hemp rope, which is not only low-cost but also environmentally friendly. After the spacer is lowered in place, the worker can put the lifting rope 15 into the hole.

[0053] The implementation principle of this embodiment is as follows: During use, after workers use the lifting rope 15 to lower the entire spacer to the designated position in the blast hole, they hold a long rod and press the upper end head cover plate 2 downward in the blast hole. The end head cover plate 2 is stressed and drives the inner telescopic rods 42 in the plurality of telescopic members 4 to contract simultaneously. The plurality of inner telescopic rods 42 will drive the second container 6 to move downward. When the sealing film 12 at the lower port of the second container 6 is pierced by the piercing ring 131 at the upper port of the first container 5, the aluminum sulfate solution, the second reactant 8 in the second container 6 will quickly flow into the first container 5. After contacting the water-soluble film 14 on the first container 5, it will automatically dissolve it, and then continue to flow into the first container 5 and contact the first reactant 7 sodium bicarbonate powder inside and react to release a large amount of gas. These gases will cause the soft airbag 3 and the peripheral side of the woven bag to quickly abut against the inner wall of the blast hole during the process of filling the entire soft airbag 3, thereby playing a role in spacing the explosive.

[0054] Since the telescopic rod member 4 that connects the two end covers 2 of the present application is driven by the internal gas and is fixed after extending to the longest state, and the distance between the two end covers 2 in this state is exactly equal to the required pre-set interval height between adjacent two sections of explosives in the blast hole, thus multiple telescopic rod members 4 can restrict the displacement of the entire spacer along the circumferential direction of the blast hole, avoiding excessive expansion range at the upper and lower ends during the expansion process due to lack of restriction, resulting in deviation between the distance between the explosives at the upper and lower ends of the spacer and the design value, which affects the final blasting effect.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A spacer for charging a blast hole, comprising a woven bag (1), characterized in that: The upper and lower ends of the woven bag (1) are both provided with openings, and a end head cover plate (2) is fixedly installed in each of the upper and lower openings of the woven bag (1); a soft air bag (3) is arranged inside the woven bag (1), and the upper and lower ends of the soft air bag (3) are respectively fixedly connected to the closer sides of the two end head cover plates (2). A plurality of telescopic rods (4) are arranged inside the soft air bag (3), and the upper and lower ends of the telescopic rods (4) are respectively fixedly connected to the two end head cover plates (2); when the telescopic rods (4) are extended to the longest state, the distance between the two end head cover plates (2) is equal to the required spacing height between two adjacent sections of explosives in the blast hole. A first container (5) and a second container (6) are arranged at the centers of the plurality of telescopic rods (4), the bottom of the first container (5) is installed on the lower end head cover plate (2), and the second container (6) is installed directly above the first container (5) through the plurality of telescopic rods (4); a first reactant (7) and a second reactant (8) are respectively filled in the first container (5) and the second container (6), and the first reactant (7) and the second reactant (8) can react to generate gas after coming into contact.

2. The spacer for charging blast holes according to claim 1, characterized in that: The telescopic rod (4) includes a support sleeve (41), an inner telescopic rod (42) and a spring (43), the lower end of the support sleeve (41) is fixedly installed on the lower end head cover plate (2), the lower end of the inner telescopic rod (42) penetrates downward through the upper end of the support sleeve (41) and is inserted into the support sleeve (41), and a limiting block (44) is fixedly connected to the lower end of the inner telescopic rod (42), the diameter of the limiting block (44) is larger than the diameter of the hole for passing the inner telescopic rod (42) at the upper end of the support sleeve (41) and is equal to the inner diameter of the support sleeve (41); the upper end of the inner telescopic rod (42) is fixedly connected to the upper end head cover plate (2). The spring (43) is arranged inside the support sleeve (41), and the upper and lower ends of the spring (43) are respectively fixedly connected to the limiting block (44) and the lower end head cover plate (2).

3. The spacer for charging a blast hole according to claim 2, characterized in that: A first fixing ring (9) is fixedly sleeved on the outer side of the second container (6), a second fixing ring (10) is fixedly sleeved at the height corresponding to the first fixing ring (9) on each of the plurality of inner telescopic rods (4), and the plurality of first fixing rings (9) are all fixedly connected to the outer side wall of the first fixing ring (9) through a connecting rod (11).

4. The spacer for charging a blast hole according to claim 3, characterized in that: The lower end of the second container (6) is provided with an opening, and a sealing film (12) is arranged in the opening at the lower end of the second container (6). The upper end of the first container (5) is provided with an opening, and a piercing unit (13) is arranged at the opening at the upper end of the first container (5). When the second container (6) moves downward along with the inner telescopic rod (42), the piercing unit (13) on the first container (5) can pierce the sealing film (12) on the second container (6) to make the second reactant (8) in the second container (6) fall into the first container (5).

5. The spacer for charging a blast hole according to claim 4, characterized in that: The sealing film (12) is an aluminum film, the first reactant (7) is sodium bicarbonate powder, and the second reactant (8) is an aluminum sulfate solution.

6. The spacer for use in charging a blast hole according to claim 5, characterized in that: A water-soluble film (14) is arranged in the upper port of the first container (5), and there is a gap between the water-soluble film (14) and the top of the first container (5).

7. The spacer for blast hole charging according to claim 6, characterized in that: The water-soluble film (14) is a polyvinyl alcohol film.

8. The spacer for use in blast hole charging according to claim 4, characterized in that: The piercing unit (13) includes a piercing ring (131), and a plurality of piercing teeth (132) are uniformly arranged along the circumference above the piercing ring (131). The piercing ring (131) is located directly below the first container (5), and its outer wall is fixedly installed at the central position of the upper end of the first container (5) through a support rod (133).

9. The spacer for charging a blast hole according to any one of claims 1 to 8, characterized in that: A lifting rope (15) is fixedly connected to the upper end head cover plate (2).

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