Joint cutting cartridge bag for pre-splitting blasting of surface mine and blasting method
By using steel cutter bags, threaded connections and clamped joints are designed, the existing cutter bags are easily loosened or fall off under blasting pressure, and the reliability and safety of blasting are improved.
Patent Information
- Application Number
- CN202411954761.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-06-03
AI Technical Summary
The existing cutter packs are prone to loosening or falling off when subjected to blasting pressure, and the hot melt connection method is difficult to ensure power support in an open-pit mine environment, which affects the reliability and safety of blasting.
A pipe body and a joint made of steel are used. A first connecting part is provided at both ends of the pipe body, and a cut joint is opened in the preset direction. A second connecting part is provided at both ends of the joint to the pipe body. The stability is improved through threaded connections and the installation process is simplified by the clamping part.
It improves the stability and reliability of the cutter bag during blasting, avoids loosening or falling off, and ensures the safety and efficiency of blasting in an open-pit mine environment.
Smart Images
Figure CN120084185A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of blasting devices, and specifically relates to a slotted charge and a blasting method for pre-splitting blasting in open-pit mines. Background Technique
[0002] The slope stability of open-pit mines is one of the key factors to ensure the safe and efficient operation of mine operations. In 2023, a slope collapse accident occurred in an open-pit mine in Inner Mongolia, resulting in serious casualties. This tragic event has sounded the alarm for the safety management of open-pit mines again, emphasizing the urgent need to strengthen slope stability.
[0003] When explosives explode in a blast hole, they will generate powerful shock waves and high-pressure gases, and violently impact the rock mass around the blast hole wall, causing the surrounding rock mass to break and crack. When conducting excavation blasting within a limited contour range, such as the excavation of open-pit mines, building foundations, road cuts and trenches, and the tunneling of tunnels and underground buildings, on the one hand, it is required that the blasting excavation boundary conforms to the designed contour line as much as possible to avoid over-excavation and under-excavation; at the same time, it is also required that the rock mass on the excavation boundary can be kept as intact and stable as possible. Pre-splitting (smooth surface) blasting is a blasting technique adopted to achieve the above purposes.
[0004] Directional fracture blasting is a commonly used blasting technique, which is a commonly used blasting technique for pre-splitting blasting, and is used for blasting within a limited space to achieve purposes such as engineering construction or mine exploitation. The directional blasting technique can effectively control the blasting range, reduce the impact of blasting on the surrounding environment, improve the engineering construction efficiency, and ensure construction safety. The successful application of the directional blasting technique requires comprehensive consideration of factors such as the characteristics of the blasting object, the conditions of the blasting environment, and the reasonable design of blasting parameters in order to achieve the expected effect.
[0005] Rock directional fracture blasting techniques can basically be divided into the following three categories: (1) Grooved hole rock directional fracture blasting, which uses mechanical methods to form initial directional cracks.
[0006] (2) Shaped charge rock directional fracture blasting, which uses the damage mechanism of explosive shaped charge jets to form directional cracks around the blast hole.
[0007] (3) Slotted charge directional fracture blasting, which uses the guiding effect of the slotted pipe on energy to form directional cracks along the slotted direction.
[0008] Slit charges are widely used in the directional fracture blasting of rocks. The essence of slit charge blasting is to have slits with different angles, shapes and numbers on the explosive shell with a certain density and strength, and use the slits to control the distribution of the explosion stress field and the quasi-static action and wedge action of the explosive-generated gas on the (hole wall) medium, so as to achieve the purpose of controlling the cracking direction of the blasted medium.
[0009] At present, PVC pipes are mostly used as accessories for filling explosives in slit charges to perform pre-splitting blasting operations on the slopes of open-pit mines. However, PVC pipes connected by threaded connections often lack sufficient stability when bearing blasting pressure, are prone to loosen or even fall off inside the blast holes, and may fail when bearing the high temperature and high pressure of explosives, thus affecting the blasting effect and safety; The PVC pipes connected by hot-melt connection method are difficult to guarantee the power support required at the construction site, which affects the reliability and efficiency of the hot-melt operation. Summary of the Invention
[0010] In view of this, the present application provides a slit charge and a blasting method for pre-splitting blasting in open-pit mines, which can effectively improve the reliability of blasting.
[0011] In the first aspect, an embodiment of the present application provides a slit charge for pre-splitting blasting in open-pit mines, including: a pipe body, both ends of the pipe body are through, and first connection parts are respectively provided at both ends of the pipe body, and a slit with a preset length is opened on the pipe wall of the pipe body along a preset direction, and the slit is communicated with the inner cavity of the pipe body; a joint, both ends of the joint are through, and second connection parts capable of connecting with the first connection parts of the pipe body are respectively provided at both ends of the joint; the pipe body and the joint are made of steel.
[0012] In a specific implementation manner, the slit extends along the axial direction of the pipe body.
[0013] In a specific implementation manner, the slit at least includes a first slit and a second slit, the first slit and the second slit respectively extend along the axial direction of the pipe body, and the first slit and the second slit are distributed along the circumferential direction of the pipe body at a preset angle.
[0014] In a specific implementation manner, the first slit and the second slit are symmetrically distributed along the circumferential direction of the pipe body.
[0015] In a specific implementation manner, the first connection part is provided with an internal thread, and the second connection part is provided with an external thread adapted to the internal thread of the first connection part; or, the first connection part is provided with an external thread, and the second connection part is provided with an internal thread adapted to the external thread of the first connection part.
[0016] In a specific embodiment, the joint is provided with a clamping portion, and the clamping portion has at least two symmetrically arranged surfaces.
[0017] In a second aspect, an embodiment of the present application further provides a blasting method using any one of the slotted cartridges. The blasting method includes: determining the depth of the blast hole; using the tube body and the joint to make a slotted cartridge adapted to the depth of the blast hole, wherein the slots of the respective tube bodies of the slotted cartridge are aligned with each other; placing the slotted cartridge into the blast hole; placing a detonator into the cavity of a specified tube body of the slotted cartridge; filling the slotted cartridge with explosive, and then performing a detonation operation.
[0018] In a specific embodiment, the step of using the tube body and the joint to make a slotted cartridge adapted to the depth of the blast hole includes: if the depth of the blast hole is less than a hole depth threshold, using one of the tube bodies to make the slotted cartridge; if the depth of the blast hole is greater than or equal to the hole depth threshold, connecting one or more of the tube bodies and one or more of the joints in sequence to make a slotted cartridge adapted to the depth of the blast hole.
[0019] In a specific embodiment, the step of placing the detonator into the cavity of a specified tube body of the slotted cartridge includes: placing the detonator into the cavity of the corresponding tube body of the slotted cartridge according to a preset initiation position; or placing the detonator into the cavity of the corresponding tube body of the slotted cartridge according to a preset initiation sequence.
[0020] The slotted cartridge and the blasting method for pre-splitting blasting in open-pit mines provided by the embodiments of the present application include: a tube body and a joint; both ends of the tube body are through, and first connection portions are respectively provided at both ends of the tube body. A slit with a preset length is provided on the tube wall of the tube body along a preset direction, and the slit communicates with the inner cavity of the tube body; both ends of the joint are through, and second connection portions capable of being connected to the first connection portions of the tube body are respectively provided at both ends of the joint; the tube body and the joint are made of steel. This slotted cartridge can effectively improve the reliability of blasting. Description of the Drawings
[0021] 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 for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0022] Figure 1 Schematic diagram of the tube body of a slotted cartridge for pre-splitting blasting in open-pit mines provided by an embodiment of the present application; Figure 2Schematic diagram of the joint of a slotted cartridge for pre-splitting blasting in open-pit mines provided by an embodiment of the present application; Figure 3 Schematic diagram of the on-site installation of a slotted cartridge for pre-splitting blasting in open-pit mines provided by an embodiment of the present application; Figure 4 Flowchart of the blasting method of a slotted cartridge for pre-splitting blasting in open-pit mines provided by an embodiment of the present application.
[0023] Description of main reference numerals: 10 - Slotted cartridge; 11 - Tube body; 110 - First connection part; 111 - Slotted seam; 12 - Joint; 120 - Second connection part; 121 - Clamping part; 20 - Rock mass; 21 - Blasthole; 30 - Detonating wire. Detailed implementation manners
[0024] The embodiments of the present application will be described in detail below with reference to the drawings.
[0025] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.
[0026] In the technology of rock directional fracture blasting, the application of slotted cartridges is extremely extensive. Its core principle lies in that by carefully designing and arranging slotted seams with various angles, shapes and quantities on the explosive shell with specific density and strength, these slotted seams can skillfully regulate the distribution of the explosion stress field and optimize the quasi-static effect and wedge effect of the explosion-generated gas on the hole wall medium. Through this refined control means, the slotted cartridge blasting technology can accurately guide and control the cracking direction of the explosion medium, thus realizing highly customized blasting effects.
[0027] PVC pipes are often used as accessories for filling explosives in slotted cartridges. However, a common problem in practice is that some of the PVC pipes used fail to meet the quality standards and are difficult to effectively withstand the high-temperature and high-pressure environment generated during explosive detonation, which directly weakens the expected effect of directional fracture blasting. If high-quality PVC pipes are selected, although it can significantly improve their ability to withstand the action of explosives, it will inevitably lead to a significant increase in the overall cost of blasting operations. In addition, in deep-hole blasting operations, there are problems with insufficient reliability in the multi-pipe connection method of PVC pipes. Specifically, there are two main forms of connection for PVC pipes: one is the threaded connection method. However, due to the special nature of the pipe material, this connection method often lacks sufficient stability when bearing blasting pressure, and the PVC pipes are prone to loosen or even fall off inside the blast holes, thus affecting the blasting effect and safety; the other is the hot-melt connection method. Although its connection strength is relatively high, in the operating environment of open-pit mines, due to the limitations of on-site power supply, it is difficult to guarantee the power support required for hot-melt operations, making this method also face certain challenges in actual operation and difficult to achieve efficient and reliable connection.
[0028] To solve the above problems, on the one hand, as Figure 1 shown, an embodiment of the present application provides a slotted cartridge 10 for pre-splitting blasting in open-pit mines, and the slotted cartridge 10 includes a pipe body 11 and a joint 12.
[0029] Both ends of the pipe body 11 are through, and first connection parts 110 are respectively provided at both ends of the pipe body 11. A cut 111 with a preset length is provided on the pipe wall of the pipe body 11 along a preset direction, and the cut 111 communicates with the inner cavity of the pipe body 11.
[0030] The slotted cartridge 10 of this embodiment may include only one pipe body 11, or may include two or more pipe bodies 11. The pipe body 11 has a through structure at both ends, so that after multiple pipe bodies 11 are axially connected, substances for blasting such as explosives can be placed into the cavities of each pipe body 11.
[0031] As Figure 1 shown, a cut 111 with a preset length and communicating with the inner cavity of the pipe body 11 is provided on the pipe wall of the pipe body 11 along a preset direction. The preset direction can be set according to the blasting requirements, so that the cut 111 can guide the blasting energy and form a directional crack around the blast hole 21 along the direction of the cut 111. The number of cuts 111 can be one or two or more. Similarly, the preset length of the cut 111, the number of cuts 111, and the distribution positions of multiple cuts 111 on the pipe body 11 can also be set according to specific blasting requirements. For example, the preset length of the cut 111 can be 2 / 3 to 4 / 5 of the length of the pipe body 11.
[0032] As Figure 2As shown, both ends of the joint 12 are through, and second connecting portions 120 capable of connecting with the first connecting portion 110 of the pipe body 11 are respectively provided at both ends of the joint 12; wherein, the pipe body 11 and the joint 12 are made of steel.
[0033] The joint 12 also has a structure with both ends through. In this way, when the joint 12 and the pipe body 11 are connected, the cavities of the pipe body 11 and the joint 12 are connected and communicated, so as to facilitate putting substances for blasting such as explosives into the cavities of each pipe body 11.
[0034] In order to facilitate connecting multiple pipe bodies 11 end to end to form a slotted charge 10 suitable for the depth of the blast hole 21, in this embodiment, first connecting portions 110 are respectively provided at both ends of the pipe body 11, and second connecting portions 120 capable of connecting with the first connecting portion 110 of the pipe body 11 are respectively provided at both ends of the joint 12. In this way, the joint 12 can be used to connect multiple pipe bodies 11 and assemble them into a slotted charge 10 with a length that meets the blasting requirements. The first connecting portion 110 and the second connecting portion 120 are adapted to each other, and there are various specific structures. For example, an interference fit connection method or a quick snap connection method can be adopted to meet the corresponding construction economy or construction efficiency.
[0035] In this embodiment, the pipe body 11 and the joint 12 are made of steel. For example, the pipe body 11 can be made of seamless steel pipe, and the joint 12 can be forged or machined by turning from steel. Utilizing the higher strength and heat resistance of the steel pipe is beneficial to improving the effect of directional fracture blasting, thereby enhancing the stability of the slope structure. It not only solves the possible failure problem of PVC pipes under high temperature and high pressure of explosives, but also can ensure the reliability of blasting and improve the blasting effect on the premise of controlling costs.
[0036] The slotted charge 10 provided by the embodiment of the present application for pre-splitting blasting in open-pit mines includes a pipe body 11 and a joint 12; both ends of the pipe body 11 are through, and first connecting portions 110 are respectively provided at both ends of the pipe body 11. A cut 111 with a preset length is provided on the pipe wall of the pipe body 11 along a preset direction, and the cut 111 is communicated with the inner cavity of the pipe body 11; both ends of the joint 12 are through, and second connecting portions 120 capable of connecting with the first connecting portion 110 of the pipe body 11 are respectively provided at both ends of the joint 12; the pipe body 11 and the joint 12 are made of steel. The slotted charge 10 can effectively improve the reliability of blasting.
[0037] Optionally, as Figure 1As shown, in an embodiment of the present application, the slit 111 extends along the axial direction of the pipe body 11. That is, in this embodiment, the preset direction of the slit 111 is parallel to the axial direction of the pipe body 11. When multiple pipe bodies 11 are connected, the slits 111 of each pipe body 11 are convenient to align with each other, so that the slit 111 can guide the blasting energy and form directional cracks around the blast hole 21 along the direction of the slit 111.
[0038] Optionally, in an embodiment of the present application, the slit 111 at least includes a first slit and a second slit. The first slit and the second slit extend along the axial direction of the pipe body 11 respectively, and the first slit and the second slit are distributed along the circumferential direction of the pipe body 11 at a preset angle. In this embodiment, two slits 111, namely the first slit and the second slit, are specifically opened on the pipe wall of the pipe body 11. Similarly, the preset directions of the first slit and the second slit are respectively parallel to the axial direction of the pipe body 11, which is convenient for the slits 111 of each pipe body 11 to align with each other when multiple pipe bodies 11 are connected. In addition, the first slit and the second slit are distributed along the circumferential direction of the pipe body 11 at a preset angle, and this preset angle is set according to the blasting requirements to meet the operation requirements in specific construction scenarios.
[0039] Optionally, in an embodiment of the present application, the first slit and the second slit are symmetrically distributed along the circumferential direction of the pipe body 11, that is, the first slit and the second slit are distributed along the circumferential direction of the pipe body 11 at a preset angle of 180°. In this way, the first slit and the second slit can be used to control the distribution of the explosion stress field and the quasi-static action and wedge action of the explosion-generated gas on the hole wall of the blast hole 21, so as to achieve the purpose of controlling the cracking direction of the blasted medium.
[0040] To reduce the use cost of the slotted charge 10, optionally, as Figure 1 、 Figure 2 shown, in an embodiment of the present application, the first connecting portion 110 is provided with an internal thread, and the second connecting portion 120 is provided with an external thread adapted to the internal thread of the first connecting portion 110; or, the first connecting portion 110 is provided with an external thread, and the second connecting portion 120 is provided with an internal thread adapted to the external thread of the first connecting portion 110. The first connecting portion 110 and the second connecting portion 120 respectively have matching thread structures, which not only facilitate the connection of the pipe body 11 and the joint 12 through the first connecting portion 110 and the second connecting portion 120, ensuring the on-site operation efficiency, but also facilitate processing and manufacturing, reducing the manufacturing costs of the pipe body 11 and the joint 12. In addition, the threaded connection method of the first connecting portion 110 and the second connecting portion 120 ensures the firm and stable overall structure of the slotted charge 10 and greatly improves the tightness and reliability of the connection.
[0041] Since the first connecting portion 110 and the second connecting portion 120 respectively have matching thread structures, for the convenience of installation and operation, optionally, asFigure 2 As shown, in an embodiment of the present application, the joint 12 is provided with a clamping portion 121, and the clamping portion 121 has at least two symmetrically arranged surfaces. The clamping mouth of an installation tool such as a wrench can be clamped to the clamping portion 121 of the joint 12, and then the joint 12 is rotated to screw and tighten the thread of the second connecting portion 120 of the joint 12 with the thread of the first connecting portion 110 of the pipe body 11. To ensure that the installation tool does not slip, the clamping portion 121 is provided with at least two symmetric surfaces. For example, the clamping portion 121 can be a hexagonal column structure, which is convenient for forming a stable and reliable force application surface for the installation tool, thereby improving the usability of the joint 12 and the on-site operation efficiency.
[0042] Second, as Figure 3 、 Figure 4 shown, an embodiment of the present application further provides a blasting method using any one of the slotted explosive packages 10, and the blasting method includes: S11. Determine the depth of the blast hole 21. As Figure 3 shown, according to the depth of the blast hole 21 opened in the rock mass 20, the assembly length of the slotted explosive package 10 can be determined.
[0043] S12. Use the pipe body 11 and the joint 12 to make a slotted explosive package 10 adapted to the depth of the blast hole 21, wherein the slots 111 of the respective pipe bodies 11 of the slotted explosive package 10 are aligned with each other. Multiple pipe bodies 11 can be connected together in advance on the ground using the joint 12. When connecting, it is necessary to ensure that the slots 111 of the respective pipe bodies 11 are on the same straight line to make a slotted explosive package 10 adapted to the depth of the blast hole 21.
[0044] S13. Place the slotted explosive package 10 into the blast hole 21. In this process, it is also necessary to keep the directions of the slots 111 of the respective pipe bodies 11 of the slotted explosive package 10 consistent to make the best use of the directivity of the blasting energy.
[0045] S14. Place the detonator into the cavity of the designated pipe body of the slotted explosive package 10. The detonator is placed into the cavity of the designated pipe body of the slotted explosive package 10 so as to be detonated according to a preset position or a preset sequence.
[0046] S15. Pour the explosive into the slotted explosive package 10, and then carry out the detonation operation. Specifically, an explosive mixing truck can be used to evenly pour the explosive into the cavity of the pipe body 11 of the slotted explosive package 10. After completing the preparation process of the entire slotted explosive package 10, the detonation operation can be carried out using the detonating wire 30 extending from the slotted explosive package 10 to achieve deep-hole directional presplitting blasting.
[0047] The slotted charge 10 used in the blasting method provided by the embodiments of the present application includes a tube body 11 and a joint 12; both ends of the tube body 11 are through, and first connection parts 110 are respectively arranged at both ends of the tube body 11. A slit 111 with a preset length is formed in the tube wall of the tube body 11 along a preset direction, and the slit 111 communicates with the inner cavity of the tube body 11; both ends of the joint 12 are through, and second connection parts 120 capable of connecting with the first connection parts 110 of the tube body 11 are respectively arranged at both ends of the joint 12; the tube body 11 and the joint 12 are made of steel. This blasting method can effectively improve the reliability of blasting.
[0048] Optionally, in an embodiment of the present application, a slotted charge 10 adapted to the depth of the blast hole 21 is made by using the tube body 11 and the joint 12, including: if the depth of the blast hole 21 is less than the hole depth threshold, a single tube body 11 is used to make the slotted charge 10; if the depth of the blast hole 21 is greater than or equal to the hole depth threshold, more than one tube body 11 and more than one joint 12 are sequentially connected to make a slotted charge 10 adapted to the depth of the blast hole 21. It can be understood that when the depth of the blast hole 21 is relatively shallow and less than the hole depth threshold, and a single tube body 11 can achieve the blasting operation, there is no need to use the joint 12 to connect multiple tube bodies 11. Therefore, only a single tube body 11 can be used to make the slotted charge 10, and the hole depth threshold can be determined according to the length of the manufactured tube body 11. For example, the hole depth threshold can be equal to or slightly greater than the length of the tube body 11. When the depth of the blast hole 21 is greater than or equal to the hole depth threshold, several joints 12 can be used to connect multiple tube bodies 11 to assemble a slotted charge 10 adapted to the depth of the blast hole 21. It can be seen that the slotted charge 10 of this embodiment has a modular function and can better adapt to different construction conditions of the on-site operation environment.
[0049] Optionally, in an embodiment of the present application, the detonator is placed into the cavity of the designated tube body of the slotted charge 10, including: placing the detonator into the cavity of the corresponding tube body of the slotted charge 10 according to the preset initiation position; or placing the detonator into the cavity of the corresponding tube body of the slotted charge 10 according to the preset initiation sequence. It can be understood that the detonator, as the detonation device, determines the corresponding tube body of the slotted charge 10 according to the preset initiation position or the preset initiation sequence. For example, according to the preset initiation position, combined with the assembled length of the slotted charge 10 and the setting position in the blast hole 21, the position of the corresponding tube body relative to the slotted charge 10 can be determined, and the corresponding tube body can be used as the designated tube body to place the detonator, so as to achieve precise control of the initiation position and the initiation sequence, thereby further ensuring the reliability of blasting.
[0050] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.
[0051] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other, and the key point of each embodiment is to illustrate the differences from other embodiments.
[0052] In particular, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for the relevant parts, reference can be made to the partial description of the method embodiments.
[0053] For the convenience of description, the above device is described by dividing its functions into various units / modules. Of course, when implementing the solution of this application, the functions of each unit / module can be implemented in the same or multiple software and / or hardware.
[0054] As described above, the above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in this application should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.
Claims
1. A seam cutting charge for pre-splitting blasting in open-pit mines, characterized in that: include: A tube body, wherein both ends of the tube body are connected, and both ends of the tube body are respectively provided with a first connecting portion, and a tube wall of the tube body is provided with a slit of a preset length along a preset direction, and the slit is connected to the inner cavity of the tube body; A joint, both ends of which are connected, and both ends of the joint are respectively provided with a second connection part that can be connected to the first connection part of the tube body; The pipe body and the joint are made of steel.
2. The seam cutting charge for pre-splitting blasting in open-pit mines according to claim 1, characterized in that: The slit extends along the axial direction of the tube body.
3. The seam cutting charge for pre-splitting blasting in open-pit mines according to claim 1, characterized in that: The slits at least include a first slit and a second slit, the first slit and the second slit extend along the axial direction of the tube body respectively, and the first slit and the second slit are distributed along the circumference of the tube body at a preset angle.
4. The seam cutting charge for pre-splitting blasting in open-pit mines according to claim 3, characterized in that: The first slits and the second slits are symmetrically distributed along the circumference of the tube body.
5. The seam cutting charge for pre-splitting blasting in open-pit mines according to claim 1, characterized in that: The first connection part is provided with an internal thread, and the second connection part is provided with an external thread matching the internal thread of the first connection part; or, the first connection part is provided with an external thread, and the second connection part is provided with an internal thread matching the external thread of the first connection part.
6. The seam cutting charge for pre-splitting blasting in open-pit mines according to claim 5, characterized in that: The joint is provided with a clamping portion, and the clamping portion has at least two symmetrically arranged surfaces.
7. A blasting method using the slitting charge according to any one of claims 1 to 6, characterized in that: include: Determine the depth of the blasthole; The tube body and the joint are used to manufacture a slit charge bag adapted to the depth of the blast hole, wherein the slits of the tube bodies of the slit charge bag are aligned with each other; placing the slitting charge into the blast hole; placing a detonator into the cavity of the designated tube of the slit charge; Explosives are poured into the slit cartridges and then detonation is performed.
8. The blasting method according to claim 7, characterized in that: The method of using the tube body and the joint to make a slit medicine bag adapted to the depth of the blast hole comprises: If the depth of the blast hole is less than the hole depth threshold, one of the tubes is used to form the slitting charge; If the depth of the blast hole is greater than or equal to the hole depth threshold, one or more tube bodies and one or more connectors are connected in sequence to form a slitting powder package that matches the depth of the blast hole.
9. The blasting method according to claim 7, characterized in that: The step of placing the detonator into the cavity of the designated tube of the slitting medicine package comprises: According to a preset detonation position, the detonator is placed in the cavity of the corresponding tube body of the slit charge; or, according to a preset detonation sequence, the detonator is placed in the cavity of the corresponding tube body of the slit charge.