Expansion rock fracturing device housing, expansion rock fracturing device and expansion rock fracturing method

Abstract

The present invention discloses a casing of an expansion rock splitting device for profile mining, an expansion rock splitting device and an expansion rock splitting method, which include a detonator head, a leg wire and an expansion shell with both ends penetrating to form openings. A groove is formed by the inner wall of the expansion shell being recessed towards the outer wall, and the length direction of the groove points from one end of the expansion shell to the other end of the expansion shell. Sealing covers for sealing the openings are respectively provided on the two openings. A receiving space for receiving gas generating agent is formed between the two sealing covers in the expansion shell. One end of the leg wire is located in the receiving space and is connected with the detonator head, and the other end of the leg wire penetrates through any one of the sealing covers and extends out of the expansion shell and is used for connecting a detonator. Through the mutual cooperation among the above structures, the mining accuracy of the expansion agent mining method is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rock mining, and particularly to a housing of an expansion rock splitting device, an expansion rock splitting device, and an expansion rock splitting method. Background Art

[0002] Processed products of precious profiles such as marble, granite, white marble, and bluestone are widely used in road projects, interior decoration projects, etc., and have good economic value. The main mining methods for the above-mentioned stones include wire saw cutting, detonating cord cutting, expander mining, black powder blasting cutting, etc. Although wire saw cutting has high precision and less waste of stone materials, its efficiency is extremely low and the cost is relatively high. Since detonating cord cutting involves the use of civil explosive devices, it requires units and individuals with blasting operation qualifications to carry out operations, and its use is subject to greater restrictions. The existing mining methods commonly use expanders. The expander mining method is a method with relatively high safety and is not restricted by use, but its mining precision is relatively low. Summary of the Invention

[0003] The main object of the present invention is to provide a housing of an expansion rock splitting device, an expansion rock splitting device, and an expansion rock splitting method for profile mining, aiming to solve the technical problem of low mining precision in the existing expander mining method.

[0004] To achieve the above object, the housing of the expansion rock splitting device for profile mining proposed by the present invention includes a detonator head, a leg wire, and an expansion shell with openings formed at both ends. A groove is formed by the inner wall of the expansion shell being recessed towards the outer wall, and the length direction of the groove points from one end of the expansion shell to the other end of the expansion shell. Sealing covers for sealing the openings are respectively provided on the two openings. A receiving space for receiving gas-producing agent is formed between the two sealing covers in the expansion shell. One end of the leg wire is located in the receiving space and is connected to the detonator head, and the other end of the leg wire penetrates through any one of the sealing covers and extends out of the expansion shell for connecting to a detonator.

[0005] Preferably, the outer wall of the expansion shell is provided with positioning card strips corresponding to the number of grooves, and the position of each positioning card strip corresponds to the position of each groove one by one.

[0006] Preferably, the positioning card strip is used to be inserted into a pre-cracked groove on the wall of a hole drilled in the profile, and the gradually shrinking end of the positioning card strip is in interference fit with the groove wall of the pre-cracked groove.

[0007] The present invention also proposes an expansion rock splitting device, including the housing of the expansion rock splitting device according to any one of the above, wherein the gas-producing agent is received in the housing of the expansion rock splitting device, and the detonator head is located in the gas-producing agent.

[0008] The present invention also provides an expansive rock splitting method for profile mining, which uses the expansive rock splitting device for profile mining described in any one of the above to perform expansive rock splitting. The expansive rock splitting method for profile mining includes the following steps:

[0009] S1: Determine one to four cutting lines according to the shape of the profile blank and the impurity situation of the profile scraps;

[0010] S2: Use a drill to drill holes at the center positions of each cutting line;

[0011] S3: Place the expansive rock splitting device into the drill hole, align the grooving with the cutting line, and leave an air interval section between the bottom of the drill hole and the expansive rock splitting device;

[0012] S4: Use a plugging material to plug the orifice of the drill hole so that the expansive rock splitting device is located between the plugging material and the bottom of the drill hole;

[0013] S5: Connect the detonator to the leg wire of the ignition head, energize and detonate to complete the cutting operation.

[0014] Preferably, the outer wall of the expansion shell is provided with positioning strip corresponding to the number of grooving, and the position of each positioning strip corresponds to the position of each grooving one by one; between step S2 and step S3, the following steps are further included:

[0015] S6: Use a flat drill to symmetrically open pre-splitting grooves along the cutting line direction on both sides of the hole wall of each drill hole.

[0016] The specific step S3 is:

[0017] Place the expansive rock splitting device into the drill hole. During the installation process, it should be ensured that the positioning strip corresponds to the pre-splitting groove so that the grooving is aligned with the cutting line. An air interval section should be left between the bottom of the drill hole and the expansive rock splitting device during the installation process.

[0018] Preferably, the diameter of the drill hole is more than 1.0 times and less than 1.1 times the diameter of the expansion shell.

[0019] Preferably, the length of the expansion shell is more than one tenth and less than one half of the depth of the drill hole.

[0020] Preferably, the depth of the pre-splitting groove is greater than 2 mm.

[0021] Preferably, the height of the air interval section is less than one half of the depth of the drill hole.

[0022] In the technical solution of the present invention, a receiving member loaded with an expansion member is placed in a drill hole. There are cutting lines around the hole wall of the drill hole. The side of the expansion shell with a groove is aligned with the cutting line in the direction where fracture is required. The gas generating member generates gas, causing the expansion shell to expand and burst along the groove. The gas impacts the rock and causes the rock to fracture. The groove is used to form a stress concentration point to ensure that the gas generated by the gas generating member does work along the direction of the cutting line, enabling the rock to undergo directional fracture along the cutting line. Through the mutual cooperation between the above structures, rapid and precise cutting of profile rough materials is achieved, greatly improving the flatness of the cutting surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0024] Figure 1 It is a top view of the present invention applied to profile mining;

[0025] Figure 2 It is a cross-sectional view taken along line A-A of the present invention;

[0026] Figure 3 It is a schematic diagram of a partially enlarged structure at position M of the present invention;

[0027] Figure 4 It is a cross-sectional view taken along line B-B of the present invention;

[0028] Figure 5 It is a cross-sectional view taken along line C-C of the present invention.

[0029] Explanation of the reference numerals in the drawings:

[0030] 1. Sealing cover; 2. Expansion shell; 3. Positioning strip; 5. Leg wire; 6. Ignition head; 7. Gas generating agent; 8. Profile scrap; 9. Pre-splitting groove; 10. Drill hole; 11. Profile rough material; 12. Cutting line; 13. Air interval section; 14. Initiator; 15. Plugging material; 16. Groove.

[0031] The realization of the object, functional characteristics and advantages of the present invention will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0035] In the present invention, unless otherwise clearly defined and limited, the terms "connected", "fixed", etc. shall be understood in a broad sense. For example, "fixed" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0037] The present invention provides a shell of an expansion rock splitting device for profile mining, an expansion rock splitting device, and an expansion rock splitting method.

[0038] Please refer to Figures 1 to 5, The housing of the expansion rock-cracking device for profile mining includes an igniter 6, a leg wire 5, and an expansion shell 2 with openings formed through both ends. A groove 16 is formed by the inner wall of the expansion shell 2 recessing towards the outer wall. The length direction of the groove 16 points from one end of the expansion shell 2 to the other end. Sealing caps 1 for sealing the openings are respectively provided on the two openings. A receiving space for receiving the gas-producing charge 7 is formed between the two sealing caps 1 in the expansion shell 2. One end of the leg wire 5 is located in the receiving space and connected to the igniter 6, and the other end of the leg wire 5 penetrates through any one of the sealing caps 1 and extends outside the expansion shell 2 for connecting to a detonator 14.

[0039] In the technical solution of the present invention, the gas-producing charge 7 is loaded in the housing of the expansion rock-cracking device, and the igniter 6 is received in the gas-producing charge 7.

[0040] Place the housing of the expansion rock-cracking device loaded with the gas-producing charge 7 in the drill hole 10. There is a cutting line 12 around the hole wall of the drill hole 10. Align the side of the expansion shell 2 with the groove 16 towards the cutting line 12 in the required fracture direction. The gas component 21 generates gas, causing the expansion shell 2 to expand and burst along the groove 16. The gas impacts the rock and causes the rock to fracture. The groove 16 is used to form a stress concentration point to ensure that the gas generated by the gas-producing component does work along the direction of the cutting line 12, enabling the rock to undergo directional fracture along the cutting line 12. Through the mutual cooperation of the above structures, rapid and precise cutting of the profile rough material 11 is achieved, greatly improving the flatness of the cutting surface.

[0041] Please refer to the appendix Figures 4 - 5 , The depth of the groove 16 is more than one-fifth of the thickness of the expansion shell 2 and less than four-fifths of the thickness of the expansion shell 2. The thickness of the shell wall of the expansion shell 2 at the location with the groove 16 is thinner than the shell wall thickness of the expansion shell 2 without the groove 16, making it easier for the expansion shell 2 to burst along the groove 16 and ensuring that the expansion shell 2 cracks and expands directionally after the gas-producing charge 7 is triggered. The cross-section of the groove 16 is rectangular. The rectangular groove 16 can more easily concentrate the stress points, causing the expansion shell 2 to burst along the groove 16.

[0042] Please refer to the appendix Figure 4 , The positioning strip 3 is used to be inserted into the pre-cracked groove 9 on the hole wall of the profile drill hole 10, and the gradually narrowing end of the positioning strip 3 is in interference fit with the groove wall of the pre-cracked groove 9. The positioning strip 3 is used to be inserted into the pre-cracked groove 9 on the hole wall of the drill hole 10, so that the groove 16 in the expansion shell 2 is aligned with the pre-cracked groove 9, and further enables the expansion shell 2 to impact the pre-cracked groove 9 when bursting.

[0043] Please refer to Figures 1 - 5, the rock expansion and cracking device includes the housing of the rock expansion and cracking device described in any one of the above. The gas-producing agent 7 is housed in the housing of the rock expansion and cracking device, and the ignition head 6 is located inside the gas-producing agent 7. When detonating, the ignition head 6 ignites the gas-producing agent 7 through the detonator 14. The gas-producing agent 7 generates gas when encountering fire and expands inside the expansion shell 2. Then the gas cracks the expansion shell 2 along the through groove, achieving the directional fracture of the stone material.

[0044] Please refer to the appendix Figures 4 - 5 , the depth of the groove 16 is more than one-fifth of the wall thickness of the expansion shell 2 and less than four-fifths of the wall thickness of the expansion shell 2. The wall thickness of the expansion shell 2 where the groove 16 is provided is thinner than the wall thickness of the expansion shell 2 without the groove 16, making it easier for the expansion shell 2 to burst along the groove 16 and ensuring that the expansion shell 2 cracks directionally after the gas-producing agent 7 is excited. The cross-section of the groove 16 is rectangular. The rectangular groove 16 can more easily concentrate the stress points, making the expansion shell 2 burst along the groove 16.

[0045] Please refer to the appendix Figures 4 - 5 , the groove 16 penetrates from one end of the expansion shell 2 to the other end of the expansion shell 2. The direction of the groove 16 is on the side wall of the expansion shell 2, so as to facilitate the insertion of the expansion shell 2 into the drill hole 10, make the bursting direction of the expansion shell 2 perpendicular to the extension direction of the drill hole 10, and further make the gas ejected from the expansion shell 2 impact the hole wall of the drill hole 10 and cause the rock to fracture directionally.

[0046] Please refer to the appendix Figures 3 - 4 , the positioning strip 3 is arranged close to the one of the two sealing caps 1 that is used to face the opening of the profile drill hole 10. The positioning strip 3 is adhered to the outer wall of the expansion shell 2.

[0047] Please refer to the appendix Figure 3 , the side of the sealing cap 1 facing away from the receiving space is flush with the end face of the expansion shell 2. The sealing cap 1 is connected to the expansion shell 2 by means of threads or bonding.

[0048] Please refer to the appendix Figures 3 - 4 , the positioning strip 3 gradually narrows in the direction away from the expansion shell 2. Specifically, the cross-section of the positioning strip 3 is triangular. The positioning strip 3 with a triangular cross-section can make the positioning strip 3 easily inserted into the slot.

[0049] Please refer to the appendix Figure 4 , the positioning strip 3 is an elastic strip that can contract. The positioning strip 3 can be any one of natural rubber strip, isoprene rubber strip, styrene-butadiene rubber strip, cis-butadiene rubber strip, chloroprene rubber strip, nitrile rubber strip, silicone rubber strip, fluororubber strip and polysulfide rubber strip. The positioning strip 3 adopts an elastic structural member, which can enable the positioning strip 3 to have an interference fit with the pre-splitting groove 9.

[0050] Please refer to Figures 1 to 5 , the expansion rock splitting method for profile mining uses the expansion rock splitting device for profile mining described in any one of the above to perform expansion rock splitting. The expansion rock splitting method for profile mining includes the following steps:

[0051] S1: Determine one to four cutting lines 12 according to the shape of the profile blank 11 and the impurity conditions of the profile corner scraps 8;

[0052] S2: Use a drill to drill holes 10 at the center positions of each cutting line 12;

[0053] S3: Place the expansion rock splitting device into the hole 10, align the grooving 16 with the cutting line 12, and leave an air interval section 13 between the bottom of the hole 10 and the expansion rock splitting device;

[0054] S4: Use the plugging material 15 to plug the orifice of the hole 10 so that the expansion rock splitting device is located between the plugging material 15 and the bottom of the hole 10;

[0055] S5: Connect the detonator 14 to the leg wire 5 of the ignition head 6, energize and detonate to complete the cutting operation.

[0056] Please refer to the appendix Figures 1 - 5 The outer wall of the expansion shell 2 is provided with positioning strip 3 corresponding to the number of the grooving 16, and the position of each positioning strip 3 corresponds to the position of each grooving 16 one by one; between step S2 and step S3, the following steps are further included:

[0057] S6. Use a flat drill to symmetrically open pre-splitting grooves 9 on both sides of the hole wall of each hole 10 along the direction of the cutting line 12;

[0058] The specific step S3 is:

[0059] Place the expansion rock splitting device into the hole 10. During the installation process, it should be ensured that the positioning strip 3 corresponds to the pre-splitting groove 9 so that the grooving 16 is aligned with the cutting line 12. An air interval section 13 should be left between the bottom of the hole 10 and the expansion rock splitting device during the installation process.

[0060] The rock expansion device filled with gas-generating agent 7 does not fall within the category of explosives and cannot be directly triggered by a detonator 14 outside the drill hole 10. After being loaded into the drill hole 10 and plugged with a plugging material 15, it can be triggered by the detonator 14 to cause the gas-generating agent 7 to generate a large amount of gas, causing the rough profile 11 to undergo directional fracture along the direction of the pre-splitting groove 9, ensuring the integrity of the cutting of the rough profile 11. The groove 16 formed in the expansion shell 2 forms a stress concentration point. After detonation, the gas products will first open the groove 16 of the expansion tube and form a linear shaped charge effect, improving the power of doing work on cutting the rough profile 11. The positioning strip 3 functions to ensure that the direction of the groove 16 in the expansion tube shell is consistent with the direction of the pre-splitting groove 9. Its width is greater than the depth of the pre-splitting groove 9 and has a certain shrinkage property, enabling the device to be fixed at any position in the blast hole by an interference connection method. The pre-splitting groove 9 functions to form another stress concentration point, ensuring that the gas products generated by the reaction of the gas-generating agent 7 do work along the direction of the pre-splitting groove 9, ensuring directional fracture along the cutting line 12. The setting of the air interval section 13 provides space for the expansion of the gas-generating agent 7, and the height of the air interval section 13 can be adjusted according to the hardness of different rough profiles 11, thereby improving the uniformity of the energy action of the gas-generating agent 7 and reducing the damage to the rough profile 11. Through the above method, both the rapid and precise cutting of the rough profile 11 is achieved, ensuring the flatness of the cutting surface, and the safety of the construction process can be guaranteed.

[0061] The gas-generating agent 7 can be the gas-generating agent 7 in the prior art. In this embodiment, the components of the gas-generating agent 7 include potassium perchlorate, salicylic acid, and ammonium oxalate:

[0062] Among them, the content of potassium perchlorate is 50% - 60%, the content of salicylic acid is 10 - 20%, and the content of ammonium oxalate is 10% - 20%. The components of the gas-generating agent 7 also contain additives for adjusting the product performance, and the content of the additives is 2% - 10%. There are no triggering conditions outside the drill hole 10, and only after being filled in the drill hole 10 and plugged can it have the triggering conditions, ensuring the safety of product use. The formulation composition of the gas-generating agent 7 enables the device to have good safety in the production, transportation, storage, and use links, and basically no harmful effects such as flying stones, vibration, and shock waves are generated during the use process.

[0063] Please refer to the appendix Figures 4 - 5 , the diameter of the drill hole 10 is more than 1.0 times the diameter of the expansion shell 2 and less than 1.1 times the diameter of the expansion shell 2. Ensure that the expansion shell 2 is smoothly installed in the drill hole 10. If the drill hole 10 is too large, the blasting power will be weakened; if it is too small, the expansion shell 2 cannot be installed into the drill hole 10.

[0064] Please refer to the appendix Figure 2, the length of the expansion shell 2 is more than one-tenth of the depth of the drill hole 10 and less than one-half of the depth of the drill hole 10. The length of the expansion shell 2 mainly depends on the depth of the drill hole 10 and the hardness of the profile blank 11, and the length of the expansion shell 2 is proportional to the depth of the drill hole 10.

[0065] Please refer to the attached Figures 4 - 5 , the depth of the pre-splitting groove 9 is greater than 2 mm. It can cause stress concentration and achieve the effect of directionally fracturing the profile blank 11. The depth of the pre-splitting groove 9 being greater than 2 mm avoids the notch being too shallow and having a small stress concentration effect.

[0066] Please refer to the attached Figure 2 , the height of the air spacer section 13 is less than one-half of the depth of the drill hole 10. The height of the air spacer section 13 is adjusted in real time according to the hardness of the profile blank 11.

[0067] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. An expansion rock splitting method for profile mining, characterized in that, Expansion rock splitting is carried out by using an expansion rock splitting device, and the expansion rock splitting device includes an expansion rock splitting device housing; the expansion rock splitting device housing includes a detonator, a leg wire, and an expansion shell with openings formed at both ends. A groove is formed by the inner wall of the expansion shell being recessed towards the outer wall, and the length direction of the groove points from one end of the expansion shell to the other end of the expansion shell. Sealing covers for sealing the openings are respectively provided on the two openings. A receiving space for receiving gas-generating agent is formed between the two sealing covers in the expansion shell. One end of the leg wire is located in the receiving space and is connected to the detonator, and the other end of the leg wire penetrates through any one of the sealing covers and extends outside the expansion shell for connecting to a detonator; the gas-generating agent is received in the expansion rock splitting device housing, and the detonator is located in the gas-generating agent; the outer wall of the expansion shell is provided with positioning strips corresponding to the number of grooves, and the position of each positioning strip corresponds to the position of each groove one by one; the positioning strips are used to be inserted into the pre-splitting grooves on the wall of the profile drilling hole, and the gradually narrowing end of the positioning strip is in interference fit with the groove wall of the pre-splitting groove; the expansion rock splitting method for profile mining includes the following steps: S1: Determine one to four cutting lines according to the shape of the profile blank and the impurity situation of the profile corner scraps; S2: Use a drill to open a drilling hole at the center position of each cutting line; S3: Place the expansion rock splitting device into the drilling hole, align the groove with the cutting line, and leave an air interval section between the bottom of the drilling hole and the expansion rock splitting device; S4: Use a plugging material to plug the orifice of the drilling hole so that the expansion rock splitting device is located between the plugging material and the bottom of the drilling hole; S5: Connect the detonator to the leg wire of the detonator, energize and detonate to complete the cutting operation.

2. The expansion rock splitting method for profile mining according to claim 1, characterized in that, Between step S2 and step S3, the following steps are further included: S6, Use a flat drill to symmetrically open pre-splitting grooves along the cutting line direction on both sides of the wall of each drilling hole; The specific content of step S3 is: Place the expansion rock splitting device into the drilling hole. During the installation process, it should be ensured that the positioning strip corresponds to the pre-splitting groove so that the groove is aligned with the cutting line. An air interval section should be left between the bottom of the drilling hole and the expansion rock splitting device during the installation process.

3. The expansion rock splitting method for profile mining according to claim 1, characterized in that, The diameter of the drilling hole is more than 1.0 times the diameter of the expansion shell and less than 1.1 times the diameter of the expansion shell.

4. The expansion rock splitting method for profile mining according to claim 1, characterized in that, The length of the expansion shell is more than one-tenth of the depth of the drilling hole and less than one-half of the depth of the drilling hole.

5. The expansion rock splitting method for profile mining according to claim 1, characterized in that, The depth of the pre-splitting groove is greater than 2 mm.

6. The expansion rock splitting method for profile mining according to any one of claims 1 to 5, characterized in that, The height of the air interval section is less than one-half of the depth of the drilling hole.

Images