auger drill bit

Abstract

This utility model relates to the field of construction engineering technology and provides a spiral drill bit, including: a drill bit body and a mudguard assembly. An inner cavity is formed on the inner side of the drill bit body, and one end of the drill bit body is provided with a grout outlet communicating with the inner cavity; the mudguard assembly includes a connected baffle and an elastic element; the spiral drill bit has a drilling state and a grouting state; when the spiral drill bit is in the drilling state, a portion of the baffle is located on the side of the grout outlet away from the inner cavity and abuts against the outer edge of the grout outlet to close it, and the edge of the grout outlet constrains the elastic element within the inner cavity; when the spiral drill bit is in the grouting state, cement is introduced into the inner cavity to drive the elastic element to deform and cause the baffle to open the grout outlet. The spiral drill bit of this utility model, during drilling, can constrain the position of the baffle through the structural cooperation of the elastic element and the drill bit body, which helps to reduce the possibility of the baffle detaching from the grout outlet.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, and in particular to a spiral drill bit. Background Technology

[0002] When operating a conventional long spiral drill bit, the front baffle needs to be placed on the grout outlet before drilling. During the drilling process, the baffle blocks the grout outlet to prevent soil from entering the grout passage. When the drill reaches the designated depth, cement is introduced into the drill bit to force open the baffle and perform grouting.

[0003] In related technologies, to prevent the baffle from detaching from the grout outlet during drilling, it is usually necessary to connect the baffle to a chain or other connecting structure, and tighten the chain during drilling to ensure the baffle continuously seals the grout outlet (e.g., Figure 1 As shown in the figure, after drilling is completed, the chain can be loosened so that the baffle can be removed from the grout outlet under the action of gravity, so that grout can be passed into the borehole through the grout outlet.

[0004] In actual operation, foreign objects may get stuck between the baffle and the slurry outlet, or the baffle and the slurry outlet may not be fully aligned (e.g.) Figure 2 In the situation described above (as shown), the baffle cannot completely seal the grout outlet, allowing soil to enter and affecting subsequent grouting operations. Utility Model Content

[0005] This utility model provides a spiral drill bit to solve the problem in the prior art where the baffle of the spiral drill bit may detach from the slurry outlet during drilling, causing soil to enter the slurry outlet and affecting subsequent slurry flow operations.

[0006] This utility model provides a spiral drill bit, comprising: The drill bit body has an inner cavity formed on its inner side, and one end of the drill bit body is provided with a slurry outlet communicating with the inner cavity; Mudguard assembly, including connected baffles and elastic elements; The auger drill bit has a drilling state and a grouting state. When the auger drill bit is in the drilling state, a portion of the baffle is located on the side of the grout outlet away from the inner cavity and abuts against the outer side of the edge of the grout outlet to close the grout outlet. The edge of the grout outlet constrains the elastic element within the inner cavity. When the auger drill bit is in the grouting state, the inner cavity is used to introduce cement to drive the elastic element to deform and cause the baffle to open the grout outlet.

[0007] According to the present invention, the elastic element and the baffle are detachably connected in the spiral drill bit.

[0008] According to the spiral drill bit of this utility model, the elastic element has a mounting hole in the middle; the baffle includes: A base plate is used to abut against the outer edge of the slurry outlet to seal the slurry outlet; A connecting shaft is provided on the base plate and passes through the mounting hole; A pressure plate is detachably connected to the connecting shaft to confine the elastic element between the pressure plate and the base plate.

[0009] According to the spiral drill bit of this utility model, the connecting shaft is a stepped shaft; the shoulder of the stepped shaft abuts against the first side of the elastic element; and the pressure plate abuts against the second side of the elastic element.

[0010] According to the spiral drill bit of this utility model, the elastic element is in the form of a strip structure, and the two ends of the strip structure are used to abut against the edge of the slurry outlet.

[0011] According to the spiral drill bit of this utility model, the elastic element has a disc structure, and the diameter of the disc structure is larger than the diameter of the slurry outlet.

[0012] According to the spiral drill bit of this utility model, the elastic element includes: The disc portion is connected to the baffle. Multiple abutting parts are arranged at intervals along the circumference of the disc portion on the outer peripheral wall of the disc portion for abutting against the edge of the slurry outlet.

[0013] The auger drill bit according to this utility model also includes: A connector, one end of which is connected to the mudguard assembly and the other end of which is connected to the drill bit body.

[0014] According to the spiral drill bit of this utility model, the edge of the slurry outlet is provided with a positioning groove; The positioning groove has a first groove wall and a second groove wall that are perpendicular to each other. The first groove wall is used to abut against the outer peripheral wall of the baffle, and the second groove wall is used to abut against the side of the baffle facing the inner cavity.

[0015] According to the spiral drill bit of this utility model, the mudguard assembly is an integrally molded rubber part.

[0016] In this invention, during drilling, a baffle located outside the grout outlet is pressed against the edge of the outlet by the soil to seal it and prevent soil from entering the inner cavity. Simultaneously, an elastic element connected to the baffle is located inside the cavity and is limited and constrained by the cavity wall and the edge of the outlet to prevent the baffle from detaching from the outlet. During grouting, the elastic element, under the action of cement, abuts against the edge of the outlet and deforms, causing the baffle to detach from the outlet, allowing cement to enter the borehole through the outlet, thus achieving grouting. As can be seen, this invention, through the structural cooperation of the elastic element and the drill bit body, constrains the position of the baffle during drilling, effectively reducing the possibility of the baffle detaching from the outlet and solving the problem in existing technologies where the baffle may detach from the outlet during drilling, leading to soil entering the outlet and affecting subsequent grouting operations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is one of the schematic diagrams of auger drill bits in the existing technology.

[0019] Figure 2 This is the second schematic diagram of an auger drill bit in the existing technology.

[0020] Figure 3 This is a schematic diagram of the auger drill bit provided in an embodiment of this utility model.

[0021] Figure 4 This is a partial cross-sectional view of the auger drill bit during the process of installing the mudguard assembly into the drill bit body, as provided in this embodiment of the utility model.

[0022] Figure 5 This is a partial cross-sectional view of a spiral drill bit in the drilling state provided in an embodiment of this utility model.

[0023] Figure 6 This is a partial cross-sectional view of an auger drill bit in a slurry-flowing state, as provided in an embodiment of this utility model.

[0024] Figure 7 This is a schematic diagram of the elastic element provided in an embodiment of the present utility model.

[0025] Figure 8 This is a schematic diagram of an elastic element provided in another embodiment of the present invention.

[0026] Figure 9 This is a schematic diagram of an elastic element provided in another embodiment of the present invention.

[0027] Figure label: 1. Spiral drill bit; 11. Drill bit body; 111. Inner cavity; 112. Slurry outlet; 113. Positioning groove; 12. Mudguard assembly; 121. Baffle; 1211. Base plate; 1212. Connecting shaft; 1213. Pressure plate; 122. Elastic element; 1221. Mounting hole; 1222. Disc part; 1223. Abutment part; 13. Connectors. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. 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.

[0029] The following is combined with Figures 3-9 This invention describes the spiral drill bit.

[0030] like Figures 3 to 6 As shown, this utility model provides a spiral drill bit 1, including: a drill bit body 11 and a mudguard assembly 12. An inner cavity 111 is formed on the inner side of the drill bit body 11, and one end of the drill bit body 11 is provided with a slurry outlet 112 communicating with the inner cavity 111. The mudguard assembly 12 includes a connected baffle 121 and an elastic element 122. The spiral drill bit 1 has a drilling state and a slurry-flowing state. When the spiral drill bit 1 is in the drilling state, a portion of the baffle 121 is located on the side of the slurry outlet 112 away from the inner cavity 111, and abuts against the outer side of the edge of the slurry outlet 112 to close the slurry outlet 112. The edge of the slurry outlet 112 constrains the elastic element 122 within the inner cavity 111. When the spiral drill bit 1 is in the slurry-flowing state, the inner cavity 111 is used to introduce cement to drive the elastic element 122 to deform and cause the baffle 121 to open the slurry outlet 112.

[0031] Understandably, the drill bit body 11 is similar to a conventional drill bit structure. The outer peripheral wall of the drill bit body 11 is typically equipped with spiral drill blades for drilling. The drill bit body 11 has an inner cavity 111 and a slurry inlet and an outlet 112 communicating with the inner cavity 111. The slurry inlet is used to introduce cement into the inner cavity 111, and the cement passes through the inner cavity 111 and enters the borehole through the slurry outlet 112 to mix with the soil and harden the ground. In this embodiment, the drill bit body 11 has an inwardly extending edge structure at the location of the slurry outlet 112.

[0032] In this embodiment, the mudguard assembly 12 is disposed at the slurry outlet 112, and can switch its relative position with the slurry outlet 112 by the deformation of the elastic element 122 when the auger bit 1 is in different working states, so that the auger bit 1 can perform drilling and slurry flow normally.

[0033] Specifically, when the auger bit 1 is in the drilling state, the elastic element 122 and the baffle 121 are located on the inner and outer sides of the slurry outlet 112, respectively, so that the edge of the slurry outlet 112 is sandwiched between the baffle 121 and the elastic element 122. The baffle 121 is located on the outer side of the slurry outlet 112 and abuts against the edge of the slurry outlet 112 under the pressure of the soil, so as to seal the slurry outlet 112 and prevent soil from entering the inner cavity 111 (e.g., Figure 5 As shown), the elastic element 122 is located in the inner cavity 111. By reasonably setting the shape and size of the elastic element 122, it can be constrained by the edge of the grout outlet 112 and always remain in the inner cavity 111. The elastic element 122 limits the baffle 121, so that the baffle 121 can only move within a certain range relative to the grout outlet 112, preventing the baffle 121 from detaching from the grout outlet 112 and causing the grout outlet 112 to open. When the auger drill bit 1 is in the grouting state, cement is introduced into the inner cavity 111. Under the action of cement and gravity, the elastic element 122 abuts against the inner side of the edge of the grout outlet 112 and bends and deforms under the action of the edge of the grout outlet 112, cement, and gravity (e.g., Figure 6 As shown), after bending to a certain extent (for example, when the elastic element 122 can pass through the grout outlet 112), the baffle 121 will disengage from the grout outlet 112, allowing cement to enter the borehole to complete the grouting operation.

[0034] Furthermore, it is understood that before drilling with the auger bit 1, the operator can push the elastic element 122 from the outside of the slurry outlet 112 to the inside of the slurry outlet 112, with the elastic element 122 abutting against the edge of the slurry outlet 112 (e.g., Figure 4 After being subjected to the action of the edge and external thrust, the elastic element 122 bends and deforms until it can pass through the slurry outlet 112 and enter the inner cavity 111. After it is fully inside the inner cavity 111, the elastic element 122 rebounds so as to cooperate with the edge of the slurry outlet 112 to limit the entire mudguard assembly 12.

[0035] In this utility model, during drilling, the baffle 121 is located outside the grout outlet 112. It is squeezed by the soil and abuts against the edge of the grout outlet 112 to seal the grout outlet 112 and prevent soil from entering the inner cavity 111. At the same time, the elastic element 122 connected to the baffle 121 is located in the inner cavity 111 and is limited and constrained by the cavity wall and the edge of the grout outlet 112 to prevent the baffle 121 from detaching from the grout outlet 112. During grouting, the elastic element 122 abuts against the edge of the grout outlet 112 and deforms under the action of cement, so that the baffle 121 detaches from the grout outlet 112, thereby allowing cement to enter the borehole through the grout outlet 112 and realize the grouting operation. As can be seen from the above, the spiral drill bit 1 of this utility model can constrain the position of the baffle 121 through the structural cooperation of the elastic element 122 and the drill bit body 11 during drilling, which helps to reduce the possibility of the baffle 121 detaching from the slurry outlet 112. This effectively solves the problem in the prior art that the baffle of the spiral drill bit may detach from the slurry outlet during drilling, causing soil to enter the slurry outlet and affecting subsequent slurry flow operations.

[0036] Alternatively, in some embodiments, the plane of the slurry outlet 112 of the auger drill bit 1 is perpendicular to the length direction of the auger drill bit 1, and the slurry outlet 112 faces downward when the auger drill bit 1 is drilling; or, the plane of the slurry outlet 112 of the auger drill bit 1 may also be set at an angle to the length direction of the auger drill bit 1, and the slurry outlet 112 is inclined relative to the horizontal plane when the auger drill bit 1 is drilling.

[0037] In some embodiments, the elastic element 122 and the baffle 121 are detachably connected. In this embodiment, it is understood that both the elastic element 122 and the baffle 121 can have various structural shapes and sizes. By detachably connecting the elastic element 122 and the baffle 121, operators can combine suitable elastic elements 122 and baffles 121 to form a mudguard assembly 12 according to the structure of the drill bit body 11 and the drilling conditions, thus adapting to different operational needs.

[0038] Specifically, in some embodiments, such as Figures 4 to 9 As shown, the elastic member 122 has a mounting hole 1221 in the middle; the baffle 121 includes: a base plate 1211, a connecting shaft 1212 and a pressure plate 1213; the base plate 1211 is used to abut against the outer side of the edge of the slurry outlet 112 to close the slurry outlet 112; the connecting shaft 1212 is disposed on the base plate 1211 and passes through the mounting hole 1221; the pressure plate 1213 is detachably connected to the connecting shaft 1212 to limit the elastic member 122 between the pressure plate 1213 and the base plate 1211.

[0039] In this embodiment, the base plate 1211 is located outside the slurry outlet 112 and is used to abut against the outer edge of the slurry outlet 112 under the pressure of the soil to seal the slurry outlet 112. The connecting shaft 1212 is connected to the side of the base plate 1211 facing the slurry outlet 112 and passes through the mounting hole 1221 in the middle of the elastic member 122 to be detachably connected to the pressure plate 1213. The pressure plate 1213 and the base plate 1211 are located on both sides of the elastic member 122, and the connecting shaft 1212 can be used to limit the elastic member 122. When it is necessary to replace the elastic member 122 or the baffle 121, it is only necessary to remove the pressure plate 1213 from the connecting shaft 1212 and remove the elastic member 122 from the connecting shaft 1212.

[0040] In some embodiments, such as Figures 4 to 6 As shown, the connecting shaft 1212 is a stepped shaft, and the shoulder of the stepped shaft abuts against the first side of the elastic member 122; the pressure plate 1213 abuts against the second side of the elastic member 122.

[0041] In this embodiment, the connecting shaft 1212 is composed of a first shaft and a second shaft connected in sequence. One end of the first shaft is connected to the base plate 1211, and the other end is connected to one end of the second shaft. The second shaft passes through the mounting hole 1221 to be detachably connected to the pressure plate 1213. The shaft diameter of the first shaft is larger than that of the second shaft, so that a shoulder can be formed between the first shaft and the second shaft. The shoulder abuts against the first side of the elastic member 122, and the pressure plate 1213 abuts against the second side of the elastic member 122, thereby achieving clamping and limiting of the elastic member 122.

[0042] It is understandable that when the elastic element 122 undergoes bending deformation, part of its structure will be clamped and fixed by the pressure plate 1213 and the shoulder of the connecting shaft 1212, and the bending difficulty of the remaining part will be affected by the structure of the clamped and fixed part. Therefore, by replacing the pressure plate 1213 and the baffle 121 of the connecting shaft 1212 with different sizes, the difficulty of the deformation of the elastic element 122 can be adjusted.

[0043] Alternatively, the elastic element 122 can adopt various different structures, as long as it can be ensured that the elastic element 122 can abut against the edge of the slurry outlet 112.

[0044] In one embodiment, such as Figure 7 As shown, the elastic element 122 has a strip-shaped structure, and both ends of the strip-shaped structure are used to abut against the edge of the slurry outlet 112. In this embodiment, the length of the elastic element 122 is greater than the diameter of the slurry outlet 112. When the elastic element 122 is located in the inner cavity 111 and has a tendency to move outward, both ends of the elastic element 122 will abut against the edge of the slurry outlet 112 to prevent the elastic element 122 from detaching from the slurry outlet 112.

[0045] Furthermore, in some embodiments, the distance between the elastic element 122 and the baffle 121 is greater than the thickness of the edge of the slurry outlet 112. When the baffle 121 and the edge of the slurry outlet 112 abut against each other, there is a certain distance between the elastic element 122 and the edge of the slurry outlet 112, so that the elastic element 122 has a certain amount of room to move in the inner cavity 111. When cement is introduced into the inner cavity 111, the elastic element 122 moves outward from the slurry outlet 112 under the action of cement and abuts against the edge of the slurry outlet 112. The elastic element 122 drives the baffle 121 to move outward from the slurry outlet 112 in sync, so that a certain gap is generated between the slurry outlet 112 and the baffle 121. At this time, since the elastic element 122 cannot completely close the slurry outlet 112, cement can flow into the borehole through the gap between the elastic element 122 and the slurry outlet 112 and the gap between the slurry outlet 112 and the baffle 121. Understandably, as cement continues to flow in, it can still push the elastic element 122 to bend and deform, and cause the baffle 121 to move further away from the grout outlet 112, thus expanding the cement outflow channel.

[0046] Alternatively, in another embodiment, such as Figure 8 As shown, the elastic element 122 has a disc structure, and the diameter of the disc structure is larger than the diameter of the grout outlet 112. In this embodiment, the diameter of the disc structure is larger than the diameter of the grout outlet 112. When the elastic element 122 is located in the inner cavity 111 and has a tendency to move outward, the edge of the elastic element 122 will abut against the edge of the grout outlet 112 to prevent the elastic element 122 from detaching from the grout outlet 112. It is understood that in this embodiment, when the disc structure abuts against the edge of the grout outlet 112, it may completely block the grout outlet 112. After cement is introduced, it is necessary to wait for the cement to push the elastic element 122 to bend and deform until the shape of the elastic element 122 can completely pass through the grout outlet 112 before the grout outlet 112 can be opened to allow cement to flow into the borehole.

[0047] Alternatively, in yet another embodiment, such as Figure 9 As shown, the elastic member 122 includes a disc portion 1222 and a plurality of abutment portions 1223. The disc portion 1222 is connected to the baffle 121; the plurality of abutment portions 1223 are arranged at intervals along the circumference of the disc portion 1222 on the outer peripheral wall of the disc portion 1222 for abutting against the edge of the slurry outlet 112. In this embodiment, when the elastic member 122 is located in the inner cavity 111 and has a tendency to move outward, the plurality of abutment portions 1223 on the outer peripheral wall of the disc portion 1222 will abut against the edge of the slurry outlet 112 to prevent the elastic member 122 from disengaging from the slurry outlet 112.

[0048] Optionally, the elastic element 122 can be made of rubber.

[0049] Specifically, in some embodiments, such as Figures 3 to 5As shown, the auger drill bit 1 also includes a connector 13, one end of which is connected to the mudguard assembly 12, and the other end is connected to the drill bit body 11. In this embodiment, by providing a connector 13 between the mudguard assembly 12 and the drill bit body 11 to connect the two, the connector 13 can pull the mudguard assembly 12 to prevent the mudguard assembly 12 from completely detaching from the drill bit body 11 and falling into the borehole after being impacted by cement and being lost. This allows the mudguard assembly 12 to be recovered after the grouting operation is completed, facilitating the repeated use of the mudguard assembly 12.

[0050] Optionally, the connector 13 can be a chain, traction rope, or other connecting structure.

[0051] Specifically, in some embodiments, such as Figures 4 to 6 As shown, the edge of the slurry outlet 112 is provided with a positioning groove 113; the positioning groove 113 has a first groove wall and a second groove wall that are perpendicular to each other. The first groove wall is used to abut against the outer peripheral wall of the baffle 121, and the second groove wall is used to abut against the side of the baffle 121 facing the inner cavity 111.

[0052] In this embodiment, the edge of the slurry outlet 112 is provided with a positioning groove 113. The positioning groove 113 surrounds the entire slurry outlet 112, forming a platform structure that is adapted to the baffle 121. When the auger drill bit 1 is in the drilling state, under the pressure and push of the soil, part of the structure of the baffle 121 is embedded in the positioning groove 113. The first groove wall of the positioning groove 113 abuts against the outer peripheral wall of the baffle 121, and the second groove wall abuts against the side of the baffle 121 facing the inner cavity 111, thereby realizing the positioning of the baffle 121 and preventing the baffle 121 from shifting relative to the slurry outlet 112, thereby maintaining the closure of the slurry outlet 112.

[0053] Optionally, in some embodiments, the mudguard assembly 12 is a one-piece molded rubber component. In this embodiment, the baffle 121 and the elastic element 122 are a one-piece molded integral structure, which has higher connection strength and the rubber component has a certain elasticity, allowing the elastic element 122 to bend and deform to pass through the slurry outlet 112.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A spiral drill bit, characterized in that, include: The drill bit body has an inner cavity formed on its inner side, and one end of the drill bit body is provided with a slurry outlet communicating with the inner cavity; Mudguard assembly, including connected baffles and elastic elements; The auger drill bit has a drilling state and a grouting state. When the auger drill bit is in the drilling state, a portion of the baffle is located on the side of the grout outlet away from the inner cavity and abuts against the outer side of the edge of the grout outlet to close the grout outlet. The edge of the grout outlet constrains the elastic element within the inner cavity. When the auger drill bit is in the grouting state, the inner cavity is used to introduce cement to drive the elastic element to deform and cause the baffle to open the grout outlet.

2. The auger drill bit according to claim 1, characterized in that, The elastic element and the baffle are detachably connected.

3. The auger drill bit according to claim 2, characterized in that, The elastic element has a mounting hole in its middle; the baffle includes: A base plate is used to abut against the outer edge of the slurry outlet to seal the slurry outlet; A connecting shaft is provided on the base plate and passes through the mounting hole; A pressure plate is detachably connected to the connecting shaft to confine the elastic element between the pressure plate and the base plate.

4. The auger drill bit according to claim 3, characterized in that, The connecting shaft is a stepped shaft; the shoulder of the stepped shaft abuts against the first side of the elastic element; the pressure plate abuts against the second side of the elastic element.

5. The auger drill bit according to claim 1, characterized in that, The elastic element has a strip-shaped structure, and the two ends of the strip-shaped structure are used to abut against the edge of the slurry outlet.

6. The auger drill bit according to claim 1, characterized in that, The elastic element has a disc structure, and the diameter of the disc structure is larger than the diameter of the slurry outlet.

7. The auger drill bit according to claim 1, characterized in that, The elastic element includes: The disc portion is connected to the baffle. Multiple abutting parts are arranged at intervals along the circumference of the disc portion on the outer peripheral wall of the disc portion for abutting against the edge of the slurry outlet.

8. The auger drill bit according to claim 1, characterized in that, Also includes: A connector, one end of which is connected to the mudguard assembly and the other end of which is connected to the drill bit body.

9. The auger drill bit according to claim 1, characterized in that, The edge of the slurry outlet is provided with a positioning groove; The positioning groove has a first groove wall and a second groove wall that are perpendicular to each other. The first groove wall is used to abut against the outer peripheral wall of the baffle, and the second groove wall is used to abut against the side of the baffle facing the inner cavity.

10. The auger drill bit according to any one of claims 1 to 9, characterized in that, The mudguard assembly is a one-piece molded rubber component.

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