Drill bit for breaking rock core
By designing a drill bit for rotary drilling rigs, using the extrusion cylinder and guide surface structure to effectively break the core in the environment of low-power rotary drilling rigs, the problem of difficult to break the core in the traditional method is solved, and a wider range of results has been achieved applicability and lower construction costs.
Patent Information
- Application Number
- CN202420982659.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-08
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-05-08
AI Technical Summary
The traditional method of breaking the core is difficult to effectively decompose the core in a rotary drilling rig, resulting in low success rate, high cost, complex operation and limited scope of application, especially in a small-power rotary drilling rig environment.
A drill bit for breaking the core is designed, including a square cylinder connecting barrel and an extrusion cylinder extending downward from the connecting barrel. One side of the extrusion cylinder is provided with a vertical extrusion surface and an inward inclined guide surface. , the torque provided by the rotary drilling rig rotates the extrusion cylinder about the central axis of the drill rod, and radial thrust is applied to break the core.
When the torque output by the rotary drilling rig is smaller, it can generate greater radial thrust, which is suitable for low-power rotary drilling rig environments, reduce equipment costs, improve construction efficiency and scope of application, reduce the use of additional tools, and maintain rock Core integrity and reduce the amount of gravel.
Smart Images
Figure CN222184714U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pile hole construction devices, in particular to a drill bit used for breaking rock cores. Background Art
[0002] At present, with the continuous expansion of urban construction, the amount of pile foundation projects that need to penetrate rocks is increasing, and there are more demands for construction methods of rock pile foundation excavation. When drilling holes in rocks, a rotary drilling rig is usually used. A roller drill is installed on the drill rod of the rotary drilling rig. The roller drill rotates under the drive of the rotary drilling rig to crush and impact the rock to break it. After rotary drilling to a certain depth, a pile hole is formed. An annular rock rotary drilling groove is formed between the outside of the drill barrel and the pile hole, and a cylindrical rock core is formed in the drill barrel. Then the cylindrical rock core needs to be broken and taken out from the pile hole to complete the hole construction process. The traditional method of breaking the core uses a wedge-shaped component, which is connected to the drill pipe and inserted into the rock rotary drilling groove. The inclination of the wedge-shaped component is used to squeeze and impact the rotary drilling groove, and the radial force is decomposed when the wedge-shaped component impacts, so as to squeeze the core. However, since the rotary drilling rig cannot provide a downward pressure function, it can only rely on the deadweight of the drill pipe and the components themselves to squeeze the rock. This is difficult and the success rate is not high. In addition, relying on the deadweight of the drill pipe to press down can easily damage the rotary drilling rig.
[0003] In the existing scheme, after the core fills the drill barrel, several clips arranged on the inner wall of the drill barrel are used to press against the core, so that the core is clamped in the drill barrel, and then the drill rod of the rotary drilling rig applies torque to the drill barrel, so that the drill barrel begins to twist, and the friction between the drill barrel and the core is used to twist the core, so that the core is broken from the bottom, and then the drill barrel is manipulated to move out of the pile hole when coring, because the clips press against the core to fix it in the drill barrel, the core can be taken out of the pile hole as a whole with the drill barrel. When breaking the core in this way, the drill barrel can be used to twist the core to break it at the bottom only when the length of the core to be dug matches the length of the drill barrel. The flexibility of use is low. When the length does not match, it is necessary to use additional rock-breaking tools such as jackhammers and rock drills to split the unbroken part of the core to form gravel in the pile hole, and then manually lift the gravel out of the pile hole. Since the above-mentioned rock breaking tools are usually expensive, have low safety and long operation cycles, the construction difficulty is increased, and additional manual cleaning costs are generated, which reduces the efficiency of the construction.
[0004] In addition, the above-mentioned operation of twisting off the core by means of the drill tube is limited in scope of application in actual construction, and its implementation depends on the use of a high-power rotary drilling rig. High-power rotary drilling rigs can provide greater torque output, which is sufficient to break the core through the drill barrel, but the price of high-power rotary drilling rigs is relatively high, resulting in high construction costs, and the use requirements for operators are high. The environment of the construction site during use is strictly restricted, so it is difficult to popularize in most construction environments; and although low-power rotary drilling rigs have the characteristics of relatively low price, simple operation, and suitability for most construction site environments, their power is relatively small, so the torque they provide is relatively small. In a construction environment where only low-power rotary drilling rigs can be used, when it is necessary to use the above-mentioned construction method of breaking the core with a drill barrel, since the size of the drill barrel and the pile hole formed by it is usually large, the fixing point of the drill barrel and the core in the pile hole is far away from the center of the drill barrel, that is, the distance between the fasteners that apply force to the inner wall of the drill barrel and the rotation center axis of the drill rod is large. Therefore, under the premise that the torque output by the rotary drilling rig is small, the torque applied by the drill barrel on the core is insufficient, and the core cannot be broken, resulting in the inability to carry out the subsequent construction process. Utility Model Content
[0005] The utility model aims to provide a drill bit for breaking rock cores, which can generate a greater radial thrust when the rotary drilling rig provides the same torque, so that the rock core can be broken even when the torque output by the rotary drilling rig is smaller. The utility model is suitable for a construction environment that only provides a low-power rotary drilling rig to reduce the equipment cost required during the construction process, and is applicable to more construction environments and easy to operate.
[0006] A drill bit for breaking rock cores comprises a square cylindrical connecting tube connected to a drill rod of a rotary drilling rig, and a cylindrical extrusion tube extending downward from the connecting tube and connected to the connecting tube as a whole, wherein a vertical extrusion surface is arranged on one side of the extrusion tube, and an inwardly inclined guide surface is arranged on the opposite side to the extrusion surface.
[0007] The drill bit for breaking rock cores described in the utility model is installed and fixed on the drill rod of the rotary drilling rig through a connecting tube during the construction of breaking rock cores, and the rotary drilling rig is controlled so that the extrusion surface of the extrusion tube faces the rock core and the guide surface faces the inner wall of the pile hole, and the extrusion tube is inserted downward into the rock rotary drilling groove between the rock core and the inner wall of the pile hole and moves downward. Under the guiding action of the inclined guide surface, as the extrusion tube moves downward, the two sides of the extrusion tube will be pressed against the two sides of the rotary drilling groove, and the extrusion surface will be pressed against the side wall of the rock core. At this time, by controlling the rotary drilling rig, a torque is applied to the connecting tube connected thereto, so that the extrusion tube rotates around the central axis of the drill rod, and the extrusion surface will follow the rotation, exerting a radial thrust on the rock core, compressing the rock core, and causing the part of the rock core in contact with the extrusion surface to deviate and deform toward the other side away from the drill bit. As the extrusion tube continues to rotate, the extrusion surface can continuously exert a radial thrust on the rock core, forcing the rock core to further deviate and deform until the rock core breaks.
[0008] Compared with the existing drill barrel, the drill bit described in the utility model has an extrusion barrel which is an integrated structure extending downward from the connecting barrel, so that the distance between the extrusion surface and the center of the connecting barrel is relatively small, that is, the distance between the point where the extrusion surface applies thrust to the rock core and the central axis of the drill rod rotation is small. According to the formula: force = torque / distance, a greater radial thrust can be generated when the rotary drilling rig provides the same torque, so that the rock core can be broken even when the torque output by the rotary drilling rig is smaller. Therefore, it has a wider range of application in construction and can be applied to construction environments that only provide low-power rotary drilling rigs, thereby fully utilizing the characteristics of low-power rotary drilling rigs such as relatively low price, simple operation, and strong versatility in construction site environments, reducing the equipment cost required during the construction process, and being applicable to more construction environments, and no additional use is required when breaking the rock core. Other rock breaking tools can split the core, which makes the operation convenient and reduces the construction difficulty of the operator; in addition, since the extrusion surface is vertically arranged and pressed against the side wall of the core, the extrusion surface can always keep in contact with the core during the rotation of the extrusion cylinder and the continuous pressure on the core, and it can maintain a relatively large surface contact state when in contact with the core, which can reduce the stress concentration at the pressure contact part, thereby effectively reducing the direct damage to the contact part of the core, so that the core can maintain a good degree of integrity during the fracture process, and it can also avoid the radial thrust on the entire core being absorbed and decomposed by the damaged part due to local damage to the core, resulting in the core being subjected to a reduced radial thrust or not being subjected to radial thrust, thereby preventing the core from being broken. Abnormal situation occurs, and the amount of extra gravel generated in the pile hole during construction can be reduced, which is convenient for the subsequent cleaning of the pile hole. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The utility model is further described below in conjunction with the accompanying drawings:
[0010] Figure 1 It is a three-dimensional structural schematic diagram of a drill bit for breaking rock cores provided by the utility model;
[0011] Figure 2 yes Figure 1 A schematic diagram of a three-dimensional structure from another perspective;
[0012] Figure 3 It is a three-dimensional structural schematic diagram of the utility model;
[0013] Figure 4 yes Figure 3 A schematic diagram of a three-dimensional structure from another perspective;
[0014] Figure 5 yes Figure 1 and Figure 3 The main view;
[0015] Figure 6 It is another three-dimensional structural schematic diagram of the utility model;
[0016] Figure 7 It is a schematic diagram of the operation of inserting the utility model into a rock rotary drilling slot;
[0017] Figure 8 It is a schematic diagram of the operation of using the utility model to abut against the rock core and the inner wall of the pile hole;
[0018] Fig. 9 The utility model is a schematic diagram of the operation of rotating the broken rock core.
[0019] Figure numerals: 1-connecting cylinder, 2-extrusion cylinder, 3-reinforcement plate, 4-fixing hole, 5-drill rod, 6-core, 7-rotary drilling groove, 8-pile hole. DETAILED DESCRIPTION
[0020] The technical scheme in the embodiment of the utility model is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field based on the utility model belong to the scope of protection of the utility model.
[0021] It should be noted that if there are directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly, so it cannot be understood as a limitation on the present invention. In the description of the embodiments, unless otherwise clearly specified and limited, the terms such as "installation" and "connection" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, in the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly specified and limited.
[0022] like Figures 1 to 6 As shown, the utility model provides a drill bit for breaking rock cores, comprising a square cylindrical connecting tube 1 connected to a drill rod of a rotary drilling rig, and a cylindrical extrusion tube 2 formed by downwardly extending the connecting tube 1 and connected to the connecting tube 1 as a whole, wherein a vertical extrusion surface is arranged on one side of the extrusion tube 2, and an inwardly inclined guide surface is arranged on the opposite side to the extrusion surface.
[0023] The drill bit provided by the utility model uses a cylindrical structure, the top end is an opening connected to the drill rod, the extrusion tube 2 is formed by extending downward from the connecting tube 1 and connected to the connecting tube 1, and its structure is simple, and its stability is stronger, it can withstand a large horizontal force, and it is not easy to deform, so that it can have a long service life during the construction process. The opening above the connecting tube 1 is adapted to the drill rod connection of most existing rotary drilling rigs, and its specific size and shape can be set and adjusted according to the rotary drilling rig actually used.
[0024] The drill bit for breaking rock cores described in the utility model is used for breaking rock cores. Figure 7 As shown, the drill bit is fixed on the drill rod 5 of the rotary drilling rig through the connecting tube 1, and the rotary drilling rig is controlled so that the extrusion surface of the extrusion tube 2 faces the rock core 6 and the guide surface faces the inner wall of the pile hole 8; the extrusion tube 2 is inserted downward into the rock rotary drilling groove 7 between the rock core 6 and the inner wall of the pile hole 8 and moved downward. Under the guidance of the inclined guide surface, as the extrusion tube 2 moves downward, the two sides of the extrusion tube 2 will be pressed against the two sides of the rotary drilling groove 7, and the extrusion surface will be pressed against the side wall of the rock core 6, as shown in FIG. Figure 8 At this time, by controlling the rotary drilling rig to apply torque to the connecting cylinder 1 connected thereto, the extrusion cylinder 2 rotates around the central axis of the drill rod 5, as shown in FIG. Fig. 9 As shown, the extrusion surface will rotate with it, exert radial thrust on the core 6, compress the core 6, and cause the part in contact with the extrusion surface to deviate and deform toward the other side away from the drill bit. As the extrusion cylinder 2 continues to rotate, the extrusion surface can continue to exert radial thrust on the core, forcing the core 6 to further deviate and deform until the core 6 deflects and breaks to the other side.
[0025] The connecting tube 1 of the drill bit is connected with the extrusion tube 2 as a whole. Figure 1 and Figure 2 As shown, the square cylindrical structure of the connecting tube 1 extends downward to form a corresponding cylindrical structure of the extrusion tube 2, so that the cross section of the middle part of the extrusion tube 2 is quadrilateral. Therefore, when the two sides of the extrusion tube 2 are pressed against the two sides of the rotary drilling groove 7, that is, the quadrilateral cross section of the extrusion tube 2 at the top of the rotary drilling groove 7 is adapted to the rotary drilling groove 7, the extrusion surface of the extrusion tube 2 is pressed against the side wall of the core 6, and the guide surface is pressed against the top of the inner wall of the pile hole 8, as shown in FIG. Figure 8 As shown in the figure, when the rotary drilling rig provides torque to rotate the drill bit, the quadrilateral cross section rotates around the central axis of the drill rod 5, so that the contact position between the two sides of the rotary drilling groove 7 gradually changes to the diagonal direction of the quadrilateral cross section. As the extrusion cylinder 2 continues to rotate, the length between the contact positions on both sides will be greater than the initial groove width, and the extrusion surface continues to apply radial thrust to the core 6. Fig. 9 As shown, with the cylindrical structure of the drill bit, under the continuous action of the thrust, the rock core 6 deflects in a direction away from the drill bit, so that it breaks at the connection between the bottom and the pile hole 8, thereby achieving rock breaking construction.
[0026] Compared with the existing drill barrel, the drill bit described in the utility model has an extrusion barrel 2 which is an integrated structure extending downward from the connecting barrel 1, so that the distance between the extrusion surface and the barrel center of the connecting barrel 1 is relatively small, that is, the distance between the point where the extrusion surface applies thrust to the rock core and the central axis of rotation of the drill rod is small. According to the formula: force = torque / distance, a greater radial thrust can be generated when the rotary drilling rig provides the same torque, so that the rock core can be broken even when the torque output by the rotary drilling rig is smaller. Therefore, it has a wider range of application in construction and can be applied to construction environments that only provide low-power rotary drilling rigs. It can fully utilize the characteristics of low-power rotary drilling rigs, such as relatively low price, simple operation, and strong versatility in construction site environments, reduce the equipment cost required in the construction process, and be applicable to more construction environments. When breaking the rock core, there is no need to use other rock breaking tools to crack the rock core, which makes the operation convenient, reduces the construction difficulty of the operator, and saves construction costs. In actual use, the size of the drill bit can be adjusted according to the torque that the rotary drilling rig can provide and the formula: force = torque / distance to change the distance between the point where the thrust is applied and the rotation center axis of the drill rod, so that the rotary drilling rig used in the actual core fracture construction is matched with the drill bit to ensure that the thrust provided by the drill bit can break the core.
[0027] During the construction of breaking the core, it is only necessary to install the drill bit on the drill rod of the rotary drilling rig, and when the two sides of its extrusion cylinder 2 are pressed against the two sides of the rotary drilling groove, the rotary drilling rig applies torque to the drill bit. During the construction process, there is no need to use other rock breaking tools to crack the core, which makes the operation convenient, reduces the construction difficulty of the operator, and saves construction costs.
[0028] In addition, since the extrusion surface is vertically arranged and pressed against the side wall of the core, the extrusion surface can always keep in contact with the core during the process of the extrusion cylinder 2 rotating and continuously applying pressure to the core, and it can maintain a relatively large surface contact state when in contact with the core, which can reduce the stress concentration at the contact part of the pressure application, thereby effectively reducing the direct damage to the contact part of the core, so that the core can maintain a good degree of integrity during the fracture process; when the extrusion cylinder 2 is inserted into the rotary excavation groove, the greater the downward distance, the more contact parts it has with the core, and the better the effect of reducing the stress concentration at the contact part of the pressure application. In this way, it is possible to avoid the radial thrust on the entire core being absorbed and decomposed by the damaged part due to the local damage of the core, resulting in the radial thrust on the core being reduced or not being subjected to the radial thrust, so that the core cannot be broken. The amount of extra gravel generated in the pile hole during construction can be reduced, which is convenient for the subsequent cleaning of the pile hole, improves the efficiency of core cleaning, saves manpower investment, and makes the excavation size control accurate to ensure the excavation quality.
[0029] When using a drill bit, the point where the drill bit applies thrust to the core will deviate from the rotation center axis of the drill rod on the rotary drilling rig. Therefore, when the torque acts on the eccentric position, an additional lateral force will be generated. The magnitude of the lateral force depends on the magnitude of the torque and the magnitude of the eccentricity. The smaller the eccentricity, the smaller the lateral force. Since the lateral force will react on the drill rod of the rotary drilling rig, affecting the use of the rotary drilling rig, when the force is too large, the rotary drilling rig will be deformed and damaged. When the drill bit provided by the utility model is used to break the core, since the distance between the extrusion surface and the center of the connecting tube is relatively small, the distance between the point where the extrusion surface applies thrust to the core and the center axis of the drill rod is also small, so that the additional lateral force generated by the deviation of the thrust point from the center axis is small, and the force of the lateral force reacting on the drill rod of the rotary drilling rig will also be reduced, so that the drill rod is not easily damaged by the large reaction force, thereby reducing the occurrence of damage to the rotary drilling rig when breaking the core to a certain extent.
[0030] The drill bit described in this solution is not limited to Figure 1 The structure of the extrusion tube 2 is that one side of the extrusion tube 2 is a vertically arranged extrusion surface for contacting the core and applying radial thrust, and the opposite side of the extrusion surface is a guide surface inclined inward from top to bottom, which is connected to the top of the pile hole and plays a guiding role. The lower end of the connecting tube 1 and the upper end of the extrusion tube 2 can be fixedly connected as a whole through the existing welding process, ensuring that the extrusion tube 2 is an integral structure extending downward from the connecting tube 1, thereby forming the drill bit. The main view of the drill bit is shown in FIG. Figure 5 shown.
[0031] The inward inclination angle of the guide surface can be adjusted accordingly according to the actual situation, so that it is convenient to guide the drill bit, and the length of the extrusion barrel 2 inserted into the rotary drilling groove is sufficient, so that there are more contact points between the extrusion surface and the core, which is not specifically limited here. The lower part of the extrusion surface and the lower part of the guide surface can be set to intersect at the bottom of the extrusion barrel 2, so that the shape of the extrusion barrel 2 is a triangular prism. The lower part of the extrusion surface and the lower part of the guide surface can also be set not to intersect directly, forming other prism-like structures, which will not be described in detail here.
[0032] Furthermore, if Figure 2 As shown, the extrusion cylinder 2 is in the shape of an inverted prism, and its bottom is a quadrilateral bottom surface. At this time, the bottom edge of the extrusion surface and the bottom edge of the guide surface serve as a pair of opposite sides of the quadrilateral bottom surface, and the bottom of the extrusion cylinder 2 is a closed bottom surface structure. When this structure is set up, when a drill bit is used, the stability of the bottom end is relatively good and it is not easy to be deformed due to extrusion, so that the stability of the cylindrical structure of the extrusion cylinder 2 is further improved.
[0033] Furthermore, if Figure 3 and Figure 4As shown, the extrusion surface has the same width at the top and bottom, that is, the upper and lower parts of the extrusion surface maintain the same lateral length, so that during the rotation of the drill bit to break the core, the upper and lower parts of the extrusion surface in contact with the core can maintain continuous compression of the core, that is, the upper and lower parts of the extrusion surface can maintain a relatively large surface contact state with the core, thereby reducing the situation where a part of the extrusion surface is compressed against the core while the other part of the extrusion surface does not contact the core due to insufficient lateral length when the drill bit rotates, so that the contact between the drill bit and the core is more complete, and the force application point between the drill bit and the core can be kept intact during the rotation process, reducing the slippage between the drill bit and the core, and enabling the radial thrust provided by the drill bit to act more fully on the core, further reducing the stress concentration at the pressure contact part.
[0034] Furthermore, if Figure 6 As shown, the guide surface gradually narrows from top to bottom. Since the guide surface of the extrusion cylinder 2 is set to gradually become smaller from the top edge to the bottom edge, the intersection of the lower part of the guide surface and the two side surfaces beside it is relatively smoother, and the two side bevels of the guide surface can also provide a guiding effect. Therefore, the above structure makes it easy for the extrusion cylinder 2 to dock with the annular rock rotary drilling groove, so that it can be accurately positioned in the rotary drilling groove, and gradually move downward under the guiding effect of the guide surface, and finally the extrusion surface is abutted and pressed against the rock core, and the guiding effect provided by the guide surface is further improved. In addition, the relatively smoother structure of the intersection of the lower part of the guide surface and the two side surfaces beside it can reduce the collision between the part below the docking point and the inner wall of the pile hole during the rotation of the extrusion cylinder 2, avoid excessive damage to the inner wall of the pile hole caused by the extrusion cylinder 2 during rotation, reduce the amount of extra gravel, reduce the extra cleaning workload of the pile hole, and ensure the excavation quality of the pile hole.
[0035] As an implementation scheme of this embodiment, Figures 1 to 6 As shown, the side of the connecting tube 1 is provided with a fixing hole 4 through which the connecting tube 1 can be fixedly connected to the drill rod by inserting a fixing bolt. The drill bit can be fixedly connected to the drill rod by the fixing bolt to ensure that the drill rod drives the drill bit to rotate during operation.
[0036] Furthermore, reinforcing plates 3 are installed on the upper and lower sides of the fixing hole 4. Since the connecting tube 1 and the drill rod are fixedly connected by fixing bolts inserted into the fixing hole 4, the fixing bolts squeeze the fixing hole 4, and the upper and lower sides of the fixing hole 4 of the connecting tube 1 will directly bear a large torque from the drill rod. In order to further stabilize the connecting tube 1 and prevent it from deforming near the fixing hole 4, the connecting tube 1 needs to be reinforced. Figures 1 to 6As shown, the fixing reinforcing plates 3 can be installed on the planes above and below the fixing holes 4, which can further improve the stability of the connecting tube 1 and reduce the possibility of fracture and deformation near the fixing holes 4. The specific number and installation position of the reinforcing plates 3 can be adjusted according to actual conditions. When installing the reinforcing plates 3, the reinforcing plates 3 can be fixedly connected to the side walls of the connecting tube 1 as a whole through the existing welding process.
[0037] like Figures 1 to 6 As shown, further, the reinforcing plate 3 on the lower side of the fixing hole 4 is installed at the junction of the connecting tube 1 and the extrusion tube 2. Since the drill bit is subjected to torque from the drill rod when in use, as the contact points between the extrusion surface of the extrusion tube 2 and the rock core continue to increase, the reaction force exerted by the rock core on the extrusion tube 2 during rotation and extrusion also gradually increases, so the connection junction between the connecting tube 1 and the extrusion tube 2 is prone to fracture. In order to make the connection at the junction of the connecting tube 1 and the extrusion tube 2 more stable, and further ensure that the drill bit is not easily deformed and damaged during the construction process, the reinforcing plate 3 can be installed at the junction of the connecting tube 1 and the extrusion tube 2 located at the lower side of the fixing hole 4, so that the reinforcing plate 3 at this location can simultaneously play a stabilizing role at the junction and near the fixing hole 4, thereby simultaneously ensuring the stability of the drill bit at the junction and near the fixing hole 4, and reducing the occurrence of fractures between the connecting tube 1 and the extrusion tube 2.
[0038] As a further improvement, the reinforcing plate 3 is L-shaped and is respectively installed on the four edges of the connecting tube 1. Figures 1 to 6 As shown. Since the four edges of the connecting tube 1 are the main weak points and are subject to greater compression, the reinforcing plates 3 are installed on the four edges and adapted thereto. The reinforcing plates 3 adopt an L-shaped structure, which is convenient for adapting to the four edges of the square tube-shaped connecting tube 1. Its specific size and the connection method with the edges can be adjusted according to actual conditions. During installation, the reinforcing plates 3 are installed on the four edges of the connecting tube 1 located on the upper and lower sides of the fixing hole 4. Figure 1 As shown, each edge on the plane where the upper side of the fixing hole 4 is located is fixedly mounted with an L-shaped reinforcing plate 3 adapted thereto, and each edge at each vertex at the junction of the connecting tube 1 and the extruding tube 2 below the fixing hole 4 is fixedly mounted with an L-shaped reinforcing plate 3 adapted thereto. The above structure can further ensure the stability of the connecting tube 1 at the junction with the extruding tube 2 and near the fixing hole 4, reduce the possibility of the connecting tube 1 being broken, and has a simple structure, is easy to install, is easy to implement, and can save manufacturing costs.
[0039] The above are only some implementation methods of the utility model, and the protection scope of the utility model is not limited thereto. Although the utility model has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents; 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 various embodiments of the utility model, and they should all be included in the scope of the claims and description of the utility model. Therefore, non-substantial changes or replacements made by those skilled in the art on the basis of the utility model still fall within the protection scope of the utility model.
Claims
1. A drill bit for breaking a core, characterized in that: The invention comprises a square cylindrical connecting cylinder (1) connected to a drill rod of a rotary drilling rig, and a cylindrical extrusion cylinder (2) extending downward from the connecting cylinder (1) and connected to the connecting cylinder (1) as a whole, wherein a vertical extrusion surface is arranged on one side of the extrusion cylinder (2), and an inwardly inclined guide surface is arranged on the side opposite to the extrusion surface.
2. A drill bit for breaking a core according to claim 1, characterized in that: The extrusion surface has the same width at the top and the bottom.
3. A drill bit for breaking a core according to claim 1, characterized in that: The guide surface gradually narrows from top to bottom.
4. A drill bit for breaking a core according to claim 1, characterized in that: The extrusion cylinder (2) is in the shape of an inverted prism, and its bottom is a quadrilateral bottom surface.
5. A drill bit for breaking a core according to any one of claims 1 to 4, characterized in that: A fixing hole (4) is provided on the side of the connecting tube (1) so that the connecting tube (1) can be fixedly connected to the drill rod by inserting a fixing bolt.
6. A drill bit for breaking a core according to claim 5, characterized in that: Reinforcement plates (3) are installed on the upper and lower sides of the fixing hole (4).
7. A drill bit for breaking a core according to claim 6, characterized in that: The reinforcing plate (3) on the lower side of the fixing hole (4) is installed at the junction of the connecting cylinder (1) and the extrusion cylinder (2).
8. A drill bit for breaking a core according to claim 6, characterized in that: The reinforcing plate (3) is L-shaped and is respectively mounted on the four edges of the connecting tube (1).