Rock breaking steel drill for tuffaceous hard rock

Abstract

The utility model discloses a kind of tuff hard rock breaking rock steel drill, it is related to engineering equipment manufacturing technical field, the rock breaking steel drill includes steel drill body and pre-splitting agent conduit, steel drill body includes steel drill main body, cone body portion and rock breaking portion connected in turn, one end of the cone body portion connects steel drill main body, the other end connects rock breaking portion;The side of the cone body portion close to rock breaking portion is equipped with liquid injection port, and the steel drill main body and cone body portion are equipped with liquid guide channel in the through, and the liquid guide channel is connected with the liquid injection port;The pre-splitting agent conduit is connected on the side of steel drill main body away from cone body portion, and is communicated with liquid guide channel.This rock breaking steel drill works, rock breaking portion is under the action of pre-splitting agent transported to liquid injection port by pre-splitting agent conduit, dissolves rock, reduces rock breaking difficulty and the impact load borne by steel drill body;In addition, the rock of rock breaking portion contact site occurs compression shear and tensile shear complex effect and is destroyed, accelerates the breaking process of rock, improves the excavation efficiency of tuff hard rock.

Description

Technical Field

[0001] This utility model relates to the field of engineering equipment manufacturing technology, and more specifically, to a rock-breaking steel drill for tuffaceous hard rock. Background Technology

[0002] Tuff is a widely distributed and common fine-grained volcanic clastic rock. The clastic material mainly consists of rock fragments, crystal fragments, glass fragments, and volcanic ash, with more than 50% of the volcanic clastic material having a particle diameter of less than 2 mm.

[0003] The main mineral components of tuff include quartz, calcite, feldspar, and mica, and its hardness is between that of limestone and basalt. It has a dense structure, high density, high compressive strength, good wear resistance and durability, and can be used as building stone, concrete aggregate, raw material for cement manufacturing and potassium fertilizer extraction, with a wide range of applications.

[0004] Tuff is typically mined using steel drills, which are attached to a rock-breaking blasting head. The blasting head strikes the drill, causing the tip of the drill to penetrate the rock and break it apart. During operation, the drill is subjected to significant impact forces, and the rock is relatively hard. As a result, existing steel drills suffer from low rock-breaking efficiency and are prone to wear and tear. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a rock-breaking steel rod for tuffaceous hard rock, so as to improve the rock-breaking ability of the steel rod for tuff and the efficiency of tuff mining, and extend the service life of the steel rod.

[0006] To achieve the above objectives, the present invention aims to provide a rock-breaking steel drill for tuffaceous hard rock, characterized in that it comprises: The steel rod body includes a steel rod body, a conical part, and a rock-breaking part connected in sequence. One end of the conical part is connected to the steel rod body, and the other end is connected to the rock-breaking part. A liquid spraying port is provided on the side of the conical part near the rock-breaking part. A liquid guiding channel is provided through the steel rod body and the conical part, and the liquid guiding channel is connected to the liquid spraying port. The pre-cracking agent conduit is connected to the side of the steel rod body away from the cone portion and is in communication with the liquid guiding channel.

[0007] Preferably, the rock-breaking section includes two rock-breaking protrusions symmetrically arranged on both sides of the liquid injection port, and each rock-breaking protrusion has a blade in the middle of the side opposite to the cone section.

[0008] Preferably, each of the rock-breaking protrusions has two intersecting spherical surfaces on the outside of the cone portion, and the two spherical surfaces form the cutting edge at the point where they intersect.

[0009] Preferably, the sidewall of the steel rod body is further provided with a plurality of evenly distributed venting grooves, and the venting grooves extend from the conical part to the middle part of the steel rod body. Preferably, the cone portion is a frustum structure, with the large end of the frustum structure connected to the steel rod body and the small end of the frustum structure connected to the rock-breaking portion.

[0010] Preferably, the cone portion has an installation groove at the end away from the steel rod body, the two rock-breaking protrusions are symmetrically installed in the installation groove, and the liquid injection port is located in the installation groove and between the two rock-breaking protrusions.

[0011] Preferably, it also includes a nozzle, which is mounted on the liquid spray port.

[0012] Preferably, the inner wall of the spray nozzle is provided with an internal thread, and the connecting end of the nozzle is provided with an external thread, and the nozzle is threadedly connected to the internal thread of the spray nozzle.

[0013] Preferably, the rock-breaking protrusion is mounted on a planar mounting surface at the end of the cone portion, and the angle between the spherical surface and the mounting surface is 55-65 degrees.

[0014] Preferably, the end of the pre-cracking agent conduit away from the steel rod body is connected to a pre-cracking agent input pump, which is used to input the pre-cracking agent into the liquid channel through the pre-cracking agent conduit.

[0015] Compared with the prior art, this utility model has the following advantages and effects: The rock-breaking drill bit includes a drill bit body and a pre-cracking agent conduit. The drill bit body comprises a main body, a conical section, and a rock-breaking section. A fluid channel is provided within the drill bit body, penetrating the main body. A spray nozzle is located on the conical section, and the pre-cracking agent conduit is connected to the conical section. Two rock-breaking protrusions on the rock-breaking section are located on either side of the spray nozzle, each with a cutting edge in the center. During operation, the two rock-breaking protrusions at the drill bit's end penetrate the (tuff) rock under the pressure applied by the rock-breaking blasting head, causing radial cracks in the rock. Furthermore, the two rock-breaking protrusions cause tensile fracture between the protrusions, thereby accelerating the rock breaking process and improving the efficiency of tuff mining. Simultaneously, the spray nozzle between the two rock-breaking protrusions sprays pre-cracking agent during the rock-breaking process, promoting the dissolution of the rock between the protrusions. This reduces the difficulty of rock breaking and the impact load on the drill bit body, extending its service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the tuffaceous hard rock breaking steel drill in this embodiment of the present invention; Figure 2This is a schematic diagram of the structure of the cone-shaped part and the rock-breaking part in an embodiment of this utility model.

[0017] Explanation of reference numerals in the attached figures: 1-Steel drill bit body; 11-Steel drill bit main body; 12-Conical part; 121-Mounting groove; 122-Mounting surface; 123-Spray nozzle; 13-Rock breaking part; 131-Rock breaking protrusion; 1311-Spherical surface; 132-Cutting edge; 14-Exhaust groove; 2-Pre-cracking agent conduit; 3- Nozzle. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] Please see Figure 1-2 As shown, this utility model embodiment provides a rock-breaking steel rod for tuffaceous hard rock, the rock-breaking steel rod comprising a steel rod body 1 and a pre-cracking agent conduit 2, wherein: The steel rod body 1 includes a steel rod body 11, a cone portion 12, and a rock-breaking portion 13 connected in sequence. One end of the cone portion 12 is connected to the steel rod body 11, and the other end is connected to the rock-breaking portion 13. A liquid injection port 123 is provided on the side of the cone portion 12 near the rock-breaking portion 13. A liquid guiding channel is provided through the steel rod body 11 and the cone portion 12, and the liquid guiding channel is connected to the liquid injection port 123. The pre-cracking agent conduit 2 is connected to the side of the steel rod body 11 away from the cone portion 12 and is connected to the liquid guiding channel.

[0020] Specifically, in this embodiment, the rock-breaking steel rod consists of a steel rod body 1 and a pre-cracking agent conduit 2. During use, the pre-cracking agent can be sprayed from the injection port 123 through the liquid guiding channel. It undergoes a chemical reaction inside the rock, generating expansion force and further widening the rock cracks. Compared with simple mechanical rock breaking, it can more effectively destroy the rock mass structure, greatly improve the efficiency of rock breaking, and reduce the time and labor costs required for rock breaking.

[0021] The pre-cracking agent is delivered to the liquid channel through the pre-cracking agent conduit 2, and then released into the rock mass through the injection port 123. The pre-cracking agent can further play its role in the rock mass, producing chemical reactions, etc., and forming pre-cracks in the rock mass along the designed rock breaking path. This allows for more precise control of the range and shape of rock breaking, effectively avoiding over-breaking or uneven breaking, improving the quality of rock breaking, and making it more beneficial for subsequent engineering construction such as excavation and mining operations, and better meeting the requirements of construction precision.

[0022] For more details, please refer to Figure 2 As shown, the rock-breaking section 13 includes two rock-breaking protrusions 131 symmetrically arranged on both sides of the liquid injection port 123. Each rock-breaking protrusion 131 has a blade 132 in the middle of the side away from the cone section 12. The blade 132 not only enhances the rock-breaking ability, but also strengthens the structural strength of the rock-breaking section 13 to a certain extent, making it more able to withstand impact during the rock-breaking process, reducing the wear and damage of the rock-breaking section 13, and further improving the structural stability of the steel rod.

[0023] When the rock-breaking equipment is started, the steel chisel body 1 performs rock-breaking operations on the tuffaceous hard rock under the power drive of the equipment. The two rock-breaking protrusions 131 of the rock-breaking section 13 first contact the rock mass, and use their cutting edges 132 to perform compression shearing and tension shearing on the rock mass.

[0024] The rock-breaking protrusion 131 is a key component of the rock-breaking drill bit, requiring high hardness, high wear resistance, and good impact resistance to cope with the harsh working conditions during rock breaking. The material for the rock-breaking protrusion 131 can be high-carbon steel, tungsten alloy steel, manganese steel, etc. In this embodiment, tungsten alloy steel is chosen as the material for the rock-breaking protrusion 131. Tungsten alloy steel has high hardness, high wear resistance, and good impact resistance, which can meet the performance requirements of the rock-breaking protrusion 131 in rock breaking operations.

[0025] For more details, please refer to Figure 2 As shown, each rock-breaking protrusion 131 located outside the conical portion 12 has two intersecting spherical surfaces 1311. The two spherical surfaces 1311 intersect at their tops to form a cutting edge 132. The tip of the cutting edge 132 is crescent-shaped. This structure allows the cutting edge 132 to quickly cut into the rock mass in the initial stage of rock breaking, exerting a preliminary combined compression and shearing action on the rock mass, forming micro-cracks. As the rock-breaking operation progresses, the liquid ejected from the nozzle 123 penetrates further into the rock mass along these micro-cracks, widening the cracks. Combined with the cutting action of the cutting edge, this makes the rock mass easier to break, greatly improving rock-breaking efficiency. Compared to traditional rock-breaking tools without cutting edges, the rock-breaking speed is significantly increased.

[0026] Please see Figure 1As shown, in one embodiment, during the rock breaking process, a large amount of dust and gas will be generated due to the rock breaking. In order to prevent the gas and dust from accumulating around the steel rod body 1 and affecting the rock breaking efficiency and normal operation of the equipment, a number of evenly distributed exhaust grooves 14 are provided on the side wall of the steel rod body 1, and the exhaust grooves 14 extend from the cone part 12 to the middle of the steel rod body 11. These gases and dust will be discharged through the exhaust grooves 14. As a preferred embodiment, the venting grooves 14 are configured as four grooves, which extend from the cone portion 12 to the middle of the steel rod body 11. In this way, the venting grooves 14 can effectively prevent the steel rod from getting stuck in the rock during the rock drilling process and generating negative pressure that makes it difficult to pull out.

[0027] Understandably, during the manufacturing process, it is important to ensure that the size, shape, and spacing of the exhaust grooves 14 are uniform to guarantee the effectiveness of their exhaust function.

[0028] Please see Figure 1 As shown, in a preferred embodiment, the cone portion 12 is a frustum structure, and the large end of the frustum structure is connected to the steel rod body 11, while the small end of the frustum structure is connected to the rock-breaking portion 13.

[0029] Therefore, the frustum structure allows the steel chisel 1 to better guide the rock-breaking section 13 to align with the rock mass during the rock-breaking process, ensuring that the rock-breaking protrusion 131 and the cutting edge 132 can accurately contact the rock surface and perform a combined compression-shear and tension-shear action. Compared to the conical section without a frustum structure, the frustum structure can reduce offset and swaying during the rock-breaking process, making rock-breaking more precise and efficient, and increasing the rock-breaking speed.

[0030] For further details, please refer to Figure 2 As shown, the cone portion 12 has an installation groove 121 at the end away from the steel rod body 11, and two rock-breaking protrusions 131 are symmetrically installed in the installation groove 121. The liquid spraying port 123 is opened in the installation groove 121 and is located in the middle of the two rock-breaking protrusions 131.

[0031] Therefore, the installation groove 121 not only provides a stable installation position for the rock-breaking protrusion 131, but also enhances the connection strength between the cone portion 12 and the rock-breaking portion 13. During the rock-breaking process, the impact force borne by the rock-breaking protrusion 131 can be effectively transferred to the cone portion 12 and the steel rod body 11 through the installation groove 121, avoiding local stress concentration, reducing the risk of breakage at the connection point, and ensuring that the equipment can operate stably for a long time.

[0032] In addition, the injection port 123 is positioned between the two rock-breaking protrusions 131, allowing the pre-splitting agent to be precisely released to the predetermined location in the rock mass. After the rock-breaking protrusions 131 perform preliminary compression and tension shearing on the rock mass, the pre-splitting agent is sprayed out from the injection port 123 along with the hydraulic fluid, enabling it to penetrate more effectively into the rock mass along the micro-cracks formed by the rock-breaking protrusions 131, improving the pre-splitting quality and making the rock mass after rock breaking more uniform in size.

[0033] For further details, please refer to Figure 1 , 2 As shown, in order to accurately spray the pre-cracking agent to the predetermined position of the rock mass, the rock-breaking steel rod also includes a nozzle 3, which is installed on the liquid injection port 123. The nozzle 3 reduces the dispersion and loss of energy, further enhancing the rock-breaking effect.

[0034] For further details, please refer to Figure 1 As shown, the inner wall of the spray nozzle 123 is provided with an internal thread, and the connecting end of the nozzle 3 is provided with an external thread. The nozzle 3 is threadedly connected to the internal thread of the spray nozzle 123.

[0035] In this way, the threaded connection effectively prevents hydraulic fluid leakage during the spraying process. This sealing method is more reliable than other non-threaded connection methods (such as simple plug-in or adhesive), ensuring the stable operation of nozzle 3 under high-pressure spraying conditions.

[0036] In addition, the threaded connection makes the installation of nozzle 3 simple and quick. Operators only need to align nozzle 3 with the spray port 123 and rotate nozzle 3 to complete the installation. No complicated tools or equipment are required. This convenient installation method reduces equipment installation time and labor costs and improves construction efficiency.

[0037] Preferably, please refer to Figure 1 , 2 As shown, the rock-breaking protrusion 131 is installed on the mounting surface 122 with a planar structure at the end of the conical part 12, and the included angle between the spherical surface 1311 and the mounting surface 122 is 55-65 degrees. This included angle allows the rock-breaking protrusion 131 to cut and break the rock at the optimal angle when it contacts the rock mass, thereby improving the rock-breaking efficiency.

[0038] For more details, please refer to Figure 1 As shown, the end of the pre-cracking agent conduit 2 away from the steel rod body 11 is connected to the pre-cracking agent input pump, which is used to input the pre-cracking agent into the liquid channel through the pre-cracking agent conduit 2.

[0039] The specific working process of the tuffaceous hard rock breaking steel drill is as follows: When the rock-breaking steel drill is in operation, the drill body 1 is installed on the rock-breaking blast head, and a pre-cracking agent input pump containing pre-cracking agent is installed inside the rock-breaking blast head. The pre-cracking agent input pump is connected to the pre-cracking agent conduit 2. During the rock-breaking process, the rock-breaking blast head applies an impact force to the end of the rock-breaking steel drill. Under the pressure applied by the rock-breaking blast head, the two rock-breaking protrusions 131 penetrate into the (tuff) rock, causing radial cracks in the rock. Furthermore, the two rock-breaking protrusions 131 can cause tensile failure of the rock between the two rock-breaking protrusions 131. The rock at the contact point of the cutting edges 132 of the two rock-breaking protrusions 131 is subjected to compression failure, and the rock outside the cutting edges 132 is subjected to shear failure, thereby accelerating the rock breaking process and improving the mining efficiency of tuff. The pre-cracking agent input pump pumps the pre-cracking agent into the pre-cracking agent conduit 2, and then the pre-cracking agent is sprayed out from the spray nozzle 123, which promotes the dissolution of the rock between the two rock-breaking protrusions 131, reduces the difficulty of rock breaking and the impact load borne by the steel rod body, and extends the service life of the steel rod body 1.

[0040] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A steel drill for breaking tuffaceous hard rock, characterized in that, include: The steel rod body includes a steel rod body, a conical part, and a rock-breaking part connected in sequence. One end of the conical part is connected to the steel rod body, and the other end is connected to the rock-breaking part. A liquid spraying port is provided on the side of the conical part near the rock-breaking part. A liquid guiding channel is provided through the steel rod body and the conical part, and the liquid guiding channel is connected to the liquid spraying port. The pre-cracking agent conduit is connected to the side of the steel rod body away from the cone portion and is in communication with the liquid guiding channel.

2. The rock-breaking steel drill for tuffaceous hard rock according to claim 1, characterized in that, The rock-breaking section includes two rock-breaking protrusions symmetrically arranged on both sides of the liquid injection port, and each rock-breaking protrusion has a blade in the middle of the side opposite to the cone section.

3. The rock-breaking steel drill for tuffaceous hard rock according to claim 2, characterized in that, Each of the rock-breaking protrusions has two intersecting spherical surfaces located outside the cone portion, and the two spherical surfaces form the cutting edge at their intersection.

4. The rock-breaking steel drill for tuffaceous hard rock according to claim 1, characterized in that, The steel rod body is also provided with a plurality of evenly distributed venting grooves on its side wall, and the venting grooves extend from the conical part to the middle part of the steel rod body.

5. The rock-breaking steel drill for tuffaceous hard rock according to claim 1, characterized in that, The cone-shaped part is a frustum structure, with the large end of the frustum structure connected to the steel rod body and the small end of the frustum structure connected to the rock-breaking part.

6. The rock-breaking steel drill for tuffaceous hard rock according to claim 2 or 3, characterized in that, An installation groove is provided at the end of the cone portion away from the main body of the steel rod. Two rock-breaking protrusions are symmetrically installed in the installation groove, and the liquid injection port is located in the installation groove and between the two rock-breaking protrusions.

7. The rock-breaking steel drill for tuffaceous hard rock according to claim 6, characterized in that, It also includes a nozzle, which is mounted on the liquid spray port.

8. The rock-breaking steel drill for tuffaceous hard rock according to claim 7, characterized in that, The inner wall of the spray nozzle is provided with an internal thread, and the connecting end of the nozzle is provided with an external thread. The nozzle is threadedly connected to the internal thread of the spray nozzle.

9. The rock-breaking steel drill for tuffaceous hard rock according to claim 3, characterized in that, The rock-breaking protrusion is installed on a planar mounting surface at the end of the cone portion, and the angle between the spherical surface and the mounting surface is 55-65 degrees.

10. The rock-breaking steel drill for tuffaceous hard rock according to claim 1, characterized in that, The end of the pre-cracking agent conduit away from the steel rod body is connected to the pre-cracking agent input pump, which is used to input the pre-cracking agent into the liquid channel through the pre-cracking agent conduit.

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