Percussion drill capable of drilling occlusion holes
By introducing independent gas and liquid channel designs, as well as lubrication and slag removal structures into the impact drill, the problems of complex core processing, low construction efficiency, and poor equipment compatibility in existing non-blasting excavation technologies have been solved, achieving efficient and safe interlocking hole construction, which is suitable for small and medium-sized engineering applications.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-03-31
AI Technical Summary
Existing non-blasting excavation technology in geotechnical engineering suffers from problems such as complex core processing, low construction efficiency, poor equipment compatibility, severe vibration and displacement, insufficient cooling and lubrication, and low slag removal efficiency, which limit the application of impact drills in high-hardness rock formations.
An impact drill capable of drilling bite holes was designed. Through an innovative fluid channel and drill bit coordination mechanism, including independent gas and liquid channel design, the coolant and gas are ensured not to interfere with each other. A lubrication channel and slag discharge port are set on the core drill bit, and the guide frame provides axial guidance to achieve stable rock breaking.
It improves construction efficiency and safety, reduces the labor intensity of workers, extends tool life, and reduces construction costs, making it suitable for the intelligent expansion of small and medium-sized projects.
Smart Images
Figure CN224064280U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of engineering drilling technology and relates to an impact drill capable of drilling bite holes. Background Technology
[0002] Non-blasting excavation technology is a key construction method in geotechnical engineering, widely used in tunnel excavation, foundation pit support, rock cutting, and other fields, especially in densely populated urban areas or environmentally sensitive areas where safety, environmental friendliness, and efficiency are paramount. Traditional non-blasting excavation methods mainly include water-jet drilling, hydraulic fracturing, and static breaking, among which water-jet drilling has become one of the mainstream processes due to its low vibration and low noise characteristics. However, existing technologies still face many bottlenecks in practical applications, such as complex core processing, low construction efficiency, and insufficient drilling accuracy, which urgently require breakthroughs through technological innovation.
[0003] In recent years, impact drilling technology has gradually attracted attention due to its advantages of not requiring core sampling and simplifying construction procedures. However, its large-scale application is limited by defects such as vibration displacement and inaccurate borehole positioning in high-hardness rock formations.
[0004] Water-cooled drilling is one of the most widely used technologies in non-blasting excavation. It uses a diamond drill bit to rotate at high speed, cutting through rock strata to create a ring-shaped interlocking hole and extracting the rock core. Subsequently, splitting holes are drilled at the free face to achieve rock splitting. Although this method causes minimal disturbance to the surrounding environment, it has the following significant drawbacks:
[0005] Core processing is complex: water-cooled drilling requires drilling a complete core sample first, and then removing it from the hole manually or mechanically. In deep-hole or high-walled operations, the core sample is heavy, prone to getting stuck, and poses a high risk of operation. Furthermore, secondary processing is time-consuming and labor-intensive.
[0006] Low construction efficiency: Core drilling and splitting are carried out in separate steps, which is a complicated process. Especially in hard rock formations, the core drilling speed is slow, which leads to an extension of the overall construction period.
[0007] Poor equipment compatibility: Water-cooled drills and splitting equipment need to be configured separately, which increases equipment costs and on-site management difficulties.
[0008] To simplify the construction process, some techniques attempt to use impact drilling to directly create interlocking holes, utilizing high-frequency impact force to break the rock and avoid the core sampling step. However, the following problems still exist:
[0009] Severe vibration deviation: When the impact drill bit is working in hard rock, the vibration is severe, which can easily cause the drill bit to deviate from the predetermined trajectory, making it impossible to form a precise bite hole and affecting the quality of the free face.
[0010] Insufficient cooling and lubrication: Impact drill bits are prone to wear due to overheating from friction during prolonged operation. In traditional technology, the design of the coolant delivery channel is unreasonable, resulting in poor cooling effect and short drill bit life.
[0011] Low cuttings removal efficiency: Impact-crushed rock cuttings tend to accumulate in the borehole, clogging the drill bit gap and further increasing the risk of drill bit deviation.
[0012] Currently, non-blasting excavation technology is developing towards intelligence and multi-functional integration. For example, some studies are attempting to introduce sensors to monitor drilling parameters in real time, or to reduce human intervention through automated control. However, these technologies often rely on complex external systems, resulting in high equipment manufacturing costs and making them difficult to popularize in small and medium-sized projects. Utility Model Content
[0013] In view of this, the purpose of this utility model is to provide an impact drill that can drill bite holes. While maintaining the simplicity of the mechanical structure, it achieves a low-cost and high-reliability functional upgrade through innovative fluid channel design and drill bit coordination mechanism. This not only meets the industry's demand for efficient equipment, but also reserves compatibility space for subsequent intelligent expansion (such as adding a sensor module).
[0014] To achieve the above objectives, this utility model provides the following technical solution:
[0015] An impact drill capable of drilling engagement holes, characterized in that it comprises:
[0016] The power head is equipped with an air inlet and a water inlet;
[0017] The drill pipe, the rear end of which is connected to the output shaft of the power head;
[0018] The impactor has its rear end connected to the front end of the drill rod, and an impact drill bit is installed at the front end. The core drill bit is connected to the housing of the impactor.
[0019] The impact drill bit is located inside the coring drill bit and is coaxially arranged with the coring drill bit; the rock-breaking end of the coring drill bit is located in front of the impact drill bit.
[0020] Optionally, the output shaft of the power head integrates independent gas and liquid channels;
[0021] The drill pipe is provided with a gas transmission channel and a liquid transmission channel that are connected to the gas channel and the liquid channel respectively;
[0022] The impactor's housing has a coolant channel that communicates with the drill rod's liquid transmission channel; the gas channel and the liquid channel are isolated by a sealing structure to ensure that the gas and liquid do not interfere with each other.
[0023] Optionally, the gas channel and the liquid channel are isolated by a separator joint, a second seal is provided on the separator joint to be sealed to the gas channel, and a through hole connected to the gas channel is provided in the middle of the separator joint.
[0024] Optionally, the gas passage passes through the output shaft of the power head, the drill rod, and the shaft of the impactor, and is connected in sequence by a detachable sealing joint.
[0025] Optionally, the core drill bit has a lubrication channel inside its tube wall, the lubrication channel being evenly distributed circumferentially and extending to the cutting teeth of the core drill bit.
[0026] Optionally, the lubrication channel is connected to the coolant channel.
[0027] Optionally, the core drill bit has a circumferential discharge port at its rear end for discharging debris generated during the drilling process.
[0028] Optionally, when the impact drill bit is fully extended, a preset distance L1 is formed between the cutting end of the core drill bit and the foremost end of the impact drill bit, and L1≥0; the inner diameter D3 of the core drill bit is adapted to its theoretical borehole inner diameter D2, and the outer diameter D4 is adapted to its theoretical borehole outer diameter D5.
[0029] Optionally, the actual borehole inner diameter D6 of the coring drill bit satisfies: D3≥D2≥D6, D5≥D4.
[0030] Optionally, it also includes a guide rail, on which the power head is slidably connected.
[0031] Optionally, it may also include a guide frame, fixedly or limitingly connected to the front end of the guide rail, with the impactor passing through the guide frame to provide axial guidance.
[0032] The beneficial effects of this utility model are as follows:
[0033] Improved construction efficiency: This impact drill can drill circumferential free surfaces and central splitting holes without the need for core drilling, thereby reducing the labor intensity of workers and improving work efficiency.
[0034] Improved operational safety: Since core extraction is not required, the number of steps workers need to handle rock cores is reduced, especially at higher rock walls, avoiding the danger of retrieving heavier rock cores and improving operational safety.
[0035] Improved work efficiency: The circumferential water supply channel leads directly to the teeth of the core drill bit, which can more effectively cool and lubricate during operation, further improving work efficiency.
[0036] Extend tool life: Effective cooling and lubrication help extend the life of core drill bits and reduce costs.
[0037] Cost savings: By reducing the number of core extraction steps and increasing tool life, construction costs are reduced.
[0038] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description
[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:
[0040] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present solution;
[0041] Figure 2 This refers to the dimensional relationships between the coring drill bit, the impact drill bit, and the rock.
[0042] Figure 3 This refers to the dimensional relationship between the actual borehole inner diameter of the core drill bit;
[0043] Figure 4 This is a schematic diagram of one type of sealing structure for water passage and air passage;
[0044] Figure 5 This is a schematic diagram of another sealing structure for the water passage and the air passage.
[0045] Attached reference numerals: 1 Power head, 2 Air inlet, 3 Water inlet, 4 Drill rod, 5 Impactor, 6 Guide frame, 7 Core drill bit, 8 Slag discharge port, 9 Impact drill bit, 10 Guide rail, 11 First seal, 12 Separator joint, 13 Second seal, 14 Third seal. Detailed Implementation
[0046] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.
[0047] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0048] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0049] Please see Figures 1-5 This invention relates to an impact drill capable of drilling interlocking holes. The impact drill comprises a guide rail 10, a power head 1, a drill rod 4, an impactor 5, an impact drill bit 9, and a core drill bit 7. Its core feature is that the power head 1 is slidably fixed to the guide rail 10, and its output shaft is connected to the rear end of the drill rod 4. The front end of the drill rod 4 is connected to the rear end of the impactor 5, and the front end of the impactor 5 is connected to the impact drill bit 9. Notably, the core drill bit 7 is also fixedly mounted on the outer shell of the impactor 5.
[0050] The core drill bit 7 is connected to the housing of the impactor 5, ensuring a stable connection during construction and preventing loosening. The rock-breaking end of the core drill bit 7 is designed to be ahead of the impact drill bit 9, forming an annular engagement hole. This design allows the core drill bit 7 to break the rock before the impact drill bit 9, improving construction efficiency. The foremost tip of the impact drill bit 9 extends axially into the annular area formed by the rock-breaking end of the core drill bit 7. This design allows the impact drill bit 9 to further break the rock while the core drill bit 7 is breaking it, improving construction effectiveness.
[0051] The power head 1 includes an air inlet 2 and a water inlet 3, which provide gas and water to the impact drill bit 9 and the core drill bit 7, respectively. The output shaft of the power head 1 has a water passage and an air passage, cleverly designed to prevent interference. The drill rod 4 also has water and air passages inside, corresponding to the passages on the output shaft of the power head 1. The outer shell of the impactor 5 also has a water passage, corresponding to the water passage on the drill rod 4, ensuring smooth water flow. The core drill bit 7 also has a water passage inside its tube wall, corresponding to the water passage on the outer shell of the impactor 5, ensuring unobstructed water flow.
[0052] There are two ways to achieve a seal at the joint.
[0053] Option 1:
[0054] Please refer to Figure 4 A separator joint 12 is provided between the drill rod 4 and the output shaft of the power head 1. As the thread is screwed in, the joint automatically connects the two air passages. Simultaneously, a second seal 13 is provided on the separator joint 12, sealingly connecting to the side wall of the air passage to ensure that water and air are not interchangeable. A through hole connected to the air passage is reserved in the middle of the separator joint 12, while the water passage is located outside the separator joint 12. The connection between the drill rod 4 and the impactor 5 also adopts the same design to ensure that water and air are not interchangeable. In the optimized solution of this embodiment, a first seal 11 can be provided at the end face of the tenon-and-mortise connection structure to further ensure the sealing effect.
[0055] The separator 12 employs a high-precision threaded connection, ensuring precise alignment of the gas and liquid channels during tightening. Simultaneously, the second seal 13 forms a tight seal with the sidewall of the gas channel, preventing gas and liquid leakage. The materials selected for the separator 12 and the second seal 13 should consider corrosion resistance, wear resistance, and temperature resistance to ensure good sealing performance during long-term use. The design of the separator 12 should prioritize ease of installation and maintenance, for example, employing a quick-disassembly structure for convenient replacement or repair when needed. Adding a leak-proof ring or O-ring at the connection of the separator 12 further enhances sealing performance and prevents gas and liquid leakage. Before leaving the factory, the sealing performance of the separator 12 undergoes rigorous testing to ensure it maintains good sealing performance under various operating conditions.
[0056] Through the above design, the separator joint 12 effectively prevents gas and liquid leakage, ensuring stable operation of the impact drill during construction. The high-precision threaded connection and the use of high-quality materials give the separator joint 12 better durability, extending the equipment's service life. The quick-disassembly structure design makes maintenance and replacement of the separator joint 12 more convenient, reducing maintenance costs. Preventing gas and liquid leakage reduces safety hazards during construction, improving construction safety. Excellent sealing performance ensures continuous and stable operation of the impact drill during construction, improving construction efficiency.
[0057] Option 2:
[0058] Please refer to Figure 5 The connection structure between the core drill bit 7 and the water passage on the shell of the impactor 5 is achieved through a third seal 14, ensuring that water and air do not interfere with each other. The third seal 14 is located at the connection end face of the tenon and mortise structure. The rear end of the core drill bit 7 has a circumferential slag discharge port 8, which can discharge rocks during impact drilling. The slag discharge port 8 and the lubrication channel on the core drill bit 7 are independent of each other.
[0059] Furthermore, this utility model also includes a guide frame 6, which is fitted outside the impactor 5. As the power head 1 slides and moves back and forth, it provides guidance for the drill bit, ensuring the stability and accuracy of the drilling process. In summary, the impact drill of this utility model has a reasonable structural design and comprehensive functions, effectively improving construction efficiency and safety while reducing the labor intensity of workers. It is a novel drilling equipment with high practical value.
[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A percussion drill capable of drilling a hole for a bite, characterized in that, The application relates to a percussion drill capable of drilling and engaging holes. The percussion drill comprises a power head (1) provided with an air inlet (2) and a water inlet (3), a drill rod (4) with a rear end connected to an output shaft of the power head (1), an impactor (5) with a rear end connected to a front end of the drill rod (4) and a front end provided with an impact drill bit (9), and a coring drill bit (7) connected to a shell of the impactor (5). The impact drill bit (9) is coaxially arranged in the coring drill bit (7), and a rock-breaking end of the coring drill bit (7) is located in front of the impact drill bit (9). The output shaft of the power head (1) is internally provided with independent gas and liquid channels. The drill rod (4) is internally provided with gas and liquid transmission channels corresponding to the gas and liquid channels.
2. The percussive drill with hole for engagement of the bit according to claim 1, characterized in that: The shell of the impactor (5) is internally provided with a cooling liquid channel communicated with the liquid transmission channel of the drill rod (4), and the gas and liquid channels are isolated by a sealing structure to ensure that the gas and the liquid do not interfere with each other.
3. The percussion drill capable of drilling and engaging holes according to claim 2, wherein the gas and liquid channels are isolated by a separation joint (12), a second sealing (13) is arranged on the separation joint (12) and is in sealing connection with the gas channel, and a via hole is arranged in the middle of the separation joint (12) and is communicated with the gas channel. The gas channel penetrates the output shaft of the power head (1), the drill rod (4) and the shaft of the impactor (5), and is sequentially connected by detachable sealing joints. A lubricating channel is arranged in the pipe wall of the coring drill bit (7), the lubricating channel is uniformly distributed in the circumferential direction and extends to the position of a cutting tooth of the coring drill bit (7). A slag discharge port (8) is arranged in the circumferential direction of the rear end of the coring drill bit (7) and is used for discharging the drill cuttings generated in the drilling process.
4. The impact drill of claim 2, wherein:
7. The percussion drill capable of drilling and engaging holes according to claim 1, wherein when the impact drill bit (9) is completely extended, a preset interval L1 is formed between the cutting end of the coring drill bit (7) and the front end of the impact drill bit (9), and L1>=0; the inner diameter D3 of the coring drill bit (7) is adapted to the theoretical drilling inner diameter D2, and the outer diameter D4 is adapted to the theoretical drilling outer diameter D5.
5. The impact drill of claim 1, wherein: The actual drilling inner diameter D6 of the coring drill bit (7) satisfies D3>=D2>=D6 and D5>=D4.
6. The impact drill of claim 1, wherein: The power head (1) is slidably connected to a guide rail (10). A guide frame (6) is fixedly or limitingly connected to the front end of the guide rail (10), and the impactor (5) penetrates the guide frame (6) to provide axial guidance. 8. The percussive drill of claim 7, wherein: 9. The impact drill of claim 1, wherein: 10. The percussive drill of claim 9, wherein: