Diamond drill

Abstract

This application discloses a diamond drilling machine, including a housing, a drill bit, a seal, and a drive blade structure. The housing has a liquid inlet channel; one axial end of the drill bit is a connecting end located within the housing, and the drill bit includes a liquid outlet channel; the seal is installed within the housing, and includes a sealing portion that is inserted into the liquid outlet channel, with a through-through connecting channel within the seal; the drive blade structure is located outside the drill bit and fixedly connected to it; an air inlet channel is located within the housing; the diamond drilling machine has a working state, in which the drive blade structure rotates synchronously with the drill bit. When a gap appears between the seal and the inner wall of the liquid outlet channel, the drive blade structure can drive gas from the air inlet channel into the gap. The diamond drilling machine of this application can improve the sealing effect of the sealing structure.

Description

Technical Field

[0001] This application belongs to the field of power tool technology, specifically relating to a diamond drilling machine. Background Technology

[0002] During operation, diamond drilling machines typically require a water system to cool the drill bit and flush away drilling debris. The sealing performance of this water system directly affects the reliability and lifespan of the equipment.

[0003] Existing diamond drilling machines typically employ a single sealing ring structure or a combination of a sealing ring and a skeleton oil seal in their water circuit sealing structure. Specifically, both the sealing ring and the skeleton oil seal are stationary components, while the drill bit they mesh with is a rotating component. During operation, the rubber portion of the sealing ring directly contacts the surface of the rotating drill bit, achieving a dynamic seal through the elastic deformation of the rubber.

[0004] However, the existing sealing structure has the following shortcomings: Because the seal and drill bit are in contact as a dynamic seal, the rubber continuously experiences sliding friction with the drill bit surface. This causes the rubber material to be subjected to wear, high temperatures, and alternating stress over a long period, making it prone to aging, wear, and even ablation, thus significantly shortening the service life of the seal. As the seal wears more intensely, its sealing performance gradually declines, leading to water seepage and leakage, affecting the normal drilling operation, and potentially damaging electrical components and transmission parts inside the machine housing.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this application is to provide a diamond drilling machine that can improve the sealing effect of a sealing structure.

[0007] To achieve the above objectives, a specific embodiment of this application provides the following technical solution: A diamond drilling machine includes a housing, a drill bit, a seal, and a drive blade structure; the housing includes a gearbox with a gear cavity, and the housing has an inlet channel communicating with the gear cavity; one axial end of the drill bit is a connecting end, which is located inside the gear cavity of the housing, and the drill bit includes an outlet channel extending from the connecting end to its other axial end; the seal is sealed and installed inside the gear cavity, the seal includes a sealing part, which is inserted into the outlet channel from one side of the connecting end and abuts against the inner wall of the outlet channel, and the seal has a through-through connecting channel communicating with the inlet channel and the outlet channel; the drive blade structure is disposed outside the drill bit and fixedly connected to the drill bit; an air inlet channel is located inside the gearbox, and the drive blade structure is housed within the air inlet channel; wherein, the drive blade structure can rotate with the drill bit to generate airflow, and the airflow is used to prevent liquid in the outlet channel from entering the gear cavity of the gearbox.

[0008] A specific embodiment of this application also provides a diamond drilling machine, including a housing, a drill bit, a seal, and a drive blade structure. The housing has a liquid inlet channel; one axial end of the drill bit is a connecting end located within the housing, and the drill bit includes a liquid outlet channel extending from the connecting end to its other axial end; the seal is installed within the housing, and the seal includes a sealing portion that inserts into the liquid outlet channel from one side of the connecting end and abuts against the inner wall of the liquid outlet channel; the seal has a through-through connecting channel that connects the liquid inlet channel and the liquid outlet channel; the drive blade structure is located outside the drill bit and fixedly connected to it; an air inlet channel is located within the housing, and the drive blade structure is housed within the air inlet channel; wherein, the diamond drilling machine has a working state, in which the drive blade structure rotates synchronously with the drill bit; when a gap appears between the seal and the inner wall of the liquid outlet channel, the drive blade structure can drive gas from the air inlet channel into the gap.

[0009] In one or more embodiments of this application, the housing includes a gearbox, and the air intake channel is formed by the inner wall of the gearbox, the outer wall of the drill bit, and a seal; the drive blade structure includes a collar portion and a plurality of blade portions connected to the outer circumferential surface of the collar portion, the collar portion being sleeved on the outside of the drill bit and having an interference fit with the drill bit.

[0010] In one or more embodiments of this application, the diamond drilling machine includes an annular pressure booster located downstream of the drive blade structure. The pressure booster is sleeved outside the drill bit along the axial direction of the drill bit. The air intake channel includes a pressure boosting chamber formed by the inner wall of the annular pressure booster and the outer wall of the drill bit. Along the flow direction of the gas in the air intake channel, the radial distance between the inner wall of the annular pressure booster and the outer wall of the drill bit gradually decreases at least partially.

[0011] In one or more embodiments of this application, at least one guide vane is provided circumferentially on the inner wall of the annular booster; the annular booster is fixedly connected to the housing or the drill bit.

[0012] In one or more embodiments of this application, the inner wall of the housing is formed with an installation cavity, and the seal and the connecting end are both housed in the installation cavity; along the axial direction of the drill bit, the installation cavity communicates with the liquid inlet channel, and the seal is located between the connection between the installation cavity and the liquid inlet channel and the connecting end; the liquid inlet channel communicates with the connecting channel through the installation cavity.

[0013] In one or more embodiments of this application, the housing has a gear cavity for accommodating a gear assembly, the diamond drilling machine includes a drive motor, the output shaft of which is connected to the drill bit via the gear assembly; the housing has an air inlet communicating with the air inlet channel, the air inlet communicating with the mounting cavity, and the air inlet located on the side of the drive blade structure opposite to the liquid inlet channel; along the axial direction of the drill bit, a sealing ring is provided between the mounting cavity and the drill bit, the sealing ring being sleeved on the outside of the drill bit, and the sealing ring located on the side of the drive blade structure opposite to the liquid inlet channel; the drive blade structure is located on the side of the air inlet close to the liquid inlet channel, and the sealing ring is located on the side of the air inlet opposite to the liquid inlet channel.

[0014] In one or more embodiments of this application, a first bearing is provided inside the mounting cavity and sleeved on the outside of the drill bit. The drill bit is rotatably connected to the housing through the first bearing. Along the axial direction of the drill bit, the sealing ring is sealed between the air inlet and the first bearing.

[0015] In one or more embodiments of this application, the other axial end of the drill bit is an output end, and the drill bit further includes a plurality of auxiliary blades disposed on the inner wall of the liquid outlet channel, the auxiliary blades being configured to rotate synchronously with the drill bit; and / or, an annular protrusion is provided on the outer peripheral wall of the sealing part, the annular protrusion abutting against the inner wall of the liquid outlet channel; a plurality of annular protrusions are spaced apart along the axial direction of the drill bit, the annular protrusions are located on the outer peripheral wall of the sealing part, and an auxiliary chamber is formed between adjacent annular protrusions.

[0016] In one or more embodiments of this application, the inner wall of the housing forms an installation cavity, and the seal and the connecting end are both received within the installation cavity. The seal is interference-fitted with the installation cavity. The seal includes a connected body portion and a skirt portion. The body portion is connected to one axial end of the seal portion. The skirt portion surrounds the seal portion and the connecting end, and the skirt portion abuts against the outer peripheral wall of the connecting end. A stepped structure is formed at the connection between the body portion and the skirt portion, and two adjacent surfaces of the stepped structure abut against the inner wall of the installation cavity. And / or, the housing further includes a liquid inlet valve disposed on the liquid inlet channel. And / or, the housing is provided with an air inlet hole, and a filter screen is provided at the air inlet hole. And / or, the pressure of the gas discharged by the drive blade structure is greater than or equal to the liquid pressure at the outlet of the liquid outlet channel located at the outlet of the connecting channel.

[0017] Compared to existing technologies, the diamond drilling machine of this application initially forms a sealed structure through the insertion and engagement of the seal and the drill bit, thereby preventing liquid in the outlet channel from leaking into other spaces within the machine housing through the connection between the seal and the drill bit. When the drill bit rotates, gaps may form between the seal and the drill bit due to relative movement, or due to friction causing damage to the seal, leading to a risk of liquid leakage in the outlet channel. The drive blade structure rotates synchronously with the drill bit, allowing external gas to enter this gap through the air inlet and air inlet channel under the driving force generated by the rotation of the drive blade structure, thus forming an airtight seal. Simultaneously, the gas forms an air film along this gap on the surface of the seal that contacts the drill bit, reducing frictional wear on the seal and extending the service life of the seal. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application 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 only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of a diamond drilling machine according to an embodiment of this application;

[0020] Figure 2 This is a partial cross-sectional view of the diamond drilling machine at point BB in one embodiment of this application;

[0021] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 4This is a partially exploded view of a portion of the structure in one embodiment of this application;

[0023] Figure 5 This is a schematic diagram of a sealing element in one embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the drive blade structure in one embodiment of this application.

[0025] Explanation of key figure labels:

[0026] 1. Housing; 11. Air inlet; 12. Liquid inlet channel; 13. Air inlet channel; 14. Receiving cavity; 15. Gearbox; 151. Gear cavity; 16. Mounting cavity; 17. Liquid inlet valve; 18. Filter screen; 19. First bearing; 2. Drill bit; 21. Connecting end; 22. Output end; 23. Liquid outlet channel; 24. Auxiliary blade; 3. Seal; 31. Main body; 32. Sealing part; 321. Annular protrusion; 322. Auxiliary chamber; 33. Skirt; 34. Connecting channel; 4. Drive blade structure; 41. Ring part; 42. Blade part; 5. Annular pressure booster; 51. Guide vane; 6. Drive motor; 61. Output shaft; 7. Power module; 8. Sealing ring; 9. Gear assembly. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0028] During operation, diamond drilling rigs rely on a water system to cool the drill bit and simultaneously flush away rock cuttings / debris generated during drilling. The sealing performance of the water system is crucial for ensuring the stability and lifespan of the equipment.

[0029] Currently, the water sealing solutions for diamond drilling machines in the industry are mainly divided into two categories: one is a single sealing ring structure, and the other is a combined sealing structure of sealing ring and skeleton oil seal. The core design logic of both solutions is consistent: both designate the sealing ring and skeleton oil seal as static sealing elements, forming a mating pair with the rotating drill bit. In operation, the rubber material of the seal directly contacts the outer wall of the high-speed rotating drill bit, relying on the elastic deformation of the rubber to form a dynamic seal, thus achieving water circuit sealing and isolation.

[0030] However, the sealing solution uses a contact-type dynamic seal, meaning the sealing rubber and the drill bit surface are constantly in a state of sliding friction. During long-term operation, the rubber material is continuously subjected to wear, high-temperature impacts, and alternating stress loads, making it highly susceptible to aging, accelerated wear, and even ablation failure, significantly reducing the service life of the seal. As the seal wears more, its sealing performance continuously deteriorates, eventually leading to leaks and other malfunctions. This not only interrupts the drilling process but also allows water to seep into the machine casing, causing irreversible damage such as corrosion and short circuits to core components like electrical components and transmission mechanisms, severely impacting the overall reliability of the equipment.

[0031] like Figures 1 to 6 As shown, a diamond drilling machine according to one embodiment of this application includes a housing 1, a drill bit 2, a seal 3, a drive blade structure 4, and an air inlet channel 13; the housing 1 is provided with a liquid inlet channel 12; one axial end of the drill bit 2 is a connecting end 21, which is located inside the housing 1, and the drill bit 2 includes a liquid outlet channel 23 extending from the connecting end 21 to its other axial end; the seal 3 is installed inside the housing 1, and the seal 3 includes a sealing part 32, which is inserted into the liquid outlet channel 23 from one side of the connecting end 21 and abuts against the inner wall of the liquid outlet channel 23, thus sealing. The component 3 has a through-through connecting channel 34, which connects the liquid inlet channel 12 and the liquid outlet channel 23; the drive blade structure 4 is located outside the drill bit 2 and is fixedly connected to the drill bit 2; the air inlet channel 13 is located inside the housing 1, and the drive blade structure 4 is housed in the air inlet channel 13; the diamond drilling machine has a working state. In the working state, the drive blade structure 4 rotates synchronously with the drill bit 2. When a gap appears between the sealing part 32 and the inner wall of the liquid outlet channel 23, the drive blade structure 4 can drive the gas from the air inlet channel 13 to flow into the gap.

[0032] It is understandable that this application uses a structure in which the seal 3 and the drill bit 2 are inserted together to construct an initial sealing system, effectively preventing fluid in the outlet channel 23 from leaking from the joint between the seal 3 and the drill bit 2 into other areas inside the housing 1. During the rotation of the drill bit 2, a gap may be generated between the seal 3 and the drill bit 2 due to relative movement, or a new gap may be formed due to friction damage between the seal 3 and the drill bit 2, which will lead to the potential for fluid leakage in the outlet channel 23. Therefore, this application sets up a drive blade structure 4 that rotates synchronously with the drill bit 2. Under the driving force of the airflow generated by the rotation of the drive blade structure 4, external gas is introduced into the gap area through the air intake channel 13, thereby forming an airtight structure to seal the gap. At the same time, the gas forms a continuous gas film along the contact surface between the seal 32 and the drill bit 2 in the gap, which can effectively reduce the frictional loss between the seal 32 and the drill bit 2, thereby significantly extending the overall service life of the seal 3.

[0033] Specifically, the diamond drilling machine has a working state, which refers to the operating state when the diamond drilling machine is performing normal drilling operations. In this state, the drill bit 2 is rotating to achieve the drilling function. In the working state, the drive blade structure 4 can rotate synchronously with the drill bit 2. The pressure of the gas discharged by the drive blade structure is greater than or equal to the liquid pressure at the outlet of the liquid outlet channel 23 located at the outlet of the connecting channel 34. That is, the gas pressure generated by the rotation of the drive blade structure 4 is greater than or equal to the liquid pressure at the connection between the connecting channel 34 and the liquid inlet channel 12. This is to prevent the liquid in the liquid outlet channel 23 from flowing out through the air inlet channel 13.

[0034] like Figure 1 As shown, the housing 1 includes a main body, within which a receiving cavity 14 may be provided. The diamond drilling machine also includes modules or components such as a drive motor 6, a control module, and a power module 7. The aforementioned components, modules, and their connection methods are all common structures and connection methods in existing diamond drilling machines. The power module 7 can be a battery pack; it can also be a power cord with a plug, thereby connecting to an external power socket to supply power to the drive motor 6.

[0035] Both the drive motor 6 and the control module can be housed within the receiving cavity 14, and the control module, drive motor 6, and power module 7 are electrically connected. The control module is configured to precisely control the start, stop, speed, and direction of the drive motor 6 according to received control commands. The output shaft 61 of the drive motor 6 is connected to the drill bit 2 for driving the drill bit 2 to perform rotational motion, thereby realizing the drilling operation on the workpiece, wherein the drill bit 2 is the main working execution component.

[0036] In this embodiment, the housing 1 includes a gearbox 15, which has a gear cavity 151. The gearbox 15 is part of the housing 1 and is connected to the main body of the housing. The gear cavity 151 is used to house the gear assembly 9. The receiving cavity 14 can communicate with the gear cavity 151. The output shaft 61 of the drive motor 6 passes through the communication between the receiving cavity 14 and the gear cavity 151 and protrudes into the gear cavity 151. The output shaft 61 of the drive motor 6 is connected to the drill bit 2 through the gear assembly 9 to drive the drill bit 2 to rotate. That is, the outer circumferential surface of the output shaft 61 can be a gear-shaped structure, thereby meshing with the gear assembly 9. The gear in the gear assembly 9 can be sleeved on the drill bit 2 and fixed, thereby realizing the transmission connection between the drive motor 6 and the drill bit 2.

[0037] Typically, to ensure the sealing of the gear cavity 151 and to achieve effective lubrication of the gear assembly 9, the gear cavity 151 is filled with lubricating oil in addition to housing the mechanical components. Specifically, the gear assembly 9 is housed within the gear cavity 151, and the lubricating oil fills the interior of the gear cavity 151 to form an oil film during the operation of the gear assembly 9, thereby reducing frictional losses during tooth meshing and carrying away heat generated by high-speed operation. Furthermore, the communication points between the gear cavity 151 and other chambers can be equipped with sealing structures (such as oil seals or sealing gaskets) to prevent lubricating oil leakage and the intrusion of external impurities, thus ensuring the long-term stability and reliability of the gear assembly 9.

[0038] The housing 1 is provided with an air inlet 11 that communicates with the air inlet channel 13. That is, the air inlet 11 is located on the gearbox 15. The air inlet channel 13 can communicate with the outside through the air inlet 11, and outside gas can enter the air inlet channel 13 through the air inlet 11.

[0039] In this embodiment, an installation cavity 16 is formed on the inner wall of the housing 1, that is, an installation cavity 16 can be formed on the inner wall of the gearbox. The seal 3 and the connecting end 21 are both housed in the installation cavity 16. The installation cavity 16 can restrict the seal 3. The two axial ends of the installation cavity 16 are respectively connected to the liquid inlet channel 12 and the gear cavity 151. The installation cavity 16 can be considered to be formed inside the gear cavity 151, or the gear cavity 151 covers (partially covers or completely covers) the outside of the installation cavity 16. The seal 3 is located between the connection point of the mounting cavity 16 and the liquid inlet channel 12 and the connecting end 21. The liquid inlet channel 12 is connected to the connecting channel 34 through the mounting cavity 16. That is, the seal 3 can form a sealing barrier in the liquid (generally water) flow path, ensuring that the liquid is smoothly discharged after passing through the liquid inlet channel 12, the mounting cavity 16, the connecting channel 34, and the liquid outlet channel 23 in sequence. This prevents the liquid from seeping into the gear cavity 151, the receiving cavity, or other cavities in the housing 1 through the mounting cavity 16, thereby avoiding irreversible damage such as corrosion and short circuits to core components such as the drive motor 6, gear assembly 9, and control module. Specifically, the gas channel can be considered to be located within the mounting cavity 16, that is, a channel formed by the cooperation of the inner wall of the housing 1 located in the mounting cavity 16 and the various components located in the mounting cavity 16.

[0040] like Figure 1 and Figure 3 As shown, the air inlet 11 communicates with the mounting cavity 16, and the air inlet channel 13 can be part of the mounting cavity 16. A sealing ring 8 is provided between the mounting cavity 16 and the drill bit 2. That is, along the axial direction of the drill bit 2, a sealing ring 8 is provided between the connection between the air inlet 11 and the mounting cavity 16 and the connection between the gear cavity 151 and the mounting cavity 16. The sealing ring 8 is sleeved on the outside of the drill bit 2, and the sealing ring 8 seals the space between the outer peripheral wall of the drill bit 2 and the inner wall of the mounting cavity 16.

[0041] Understandably, by setting the sealing ring 8 as described above, on the one hand, a reliable air path isolation barrier is formed in the mounting cavity 16, completely separating the air intake channel 13 from the gear cavity 151 in the airflow path, ensuring that the airflow entering through the air intake hole 11 flows strictly along the preset path, that is, it passes through the air intake hole 11, the mounting cavity 16, the connecting channel 34, and the liquid outlet channel 23 in sequence before being discharged, preventing the gas from carrying dust or water vapor into the gear cavity 151 and causing pollution, corrosion, or lubrication failure to the gear assembly 9; on the other hand, the sealing ring 8 is sleeved on the outside of the drill bit 2 and forms a dynamic sealing fit with the outer peripheral wall of the drill bit 2 and the inner wall of the mounting cavity 16 respectively, which can maintain stable sealing performance even when the drill bit 2 is rotating at high speed, preventing the sealing failure caused by the centrifugal force or airflow pressure fluctuation generated by the rotation of the drill bit 2, thereby ensuring the cleanliness and sealing of the gear cavity 151. In addition, the sealing ring 8 is set between the two connecting points of the air inlet 11 and the gear cavity 151, forming an axial isolation. This makes full use of the structural space of the mounting cavity 16 itself, eliminating the need for additional sealing cavities or complex sealing structures. This simplifies the assembly process and reduces the number and cost of sealing elements. At the same time, this sealing arrangement facilitates maintenance and replacement, improving the maintainability and long-term reliability of the entire machine.

[0042] Furthermore, in normal operation, users should turn off the water supply before turning off the power when shutting down the diamond drill. However, in actual use, users may make a mistake by turning off the drive motor 6 first (power off first), stopping the drill bit 2 from rotating, and then closing the valves and other structures on the inlet channel 12 to stop the fluid supply. At this time, the drive blade structure 4 also stops rotating and cannot continue to provide pressure for the driving gas to flow in the air inlet channel 13. This may cause the liquid (usually water) in the outlet channel 23 to flow back into the air inlet channel 13, and even further seep into the gear cavity 151. The sealing ring 8 can effectively prevent the liquid from flowing towards the gear cavity 151. Therefore, even if the user operates incorrectly, the sealing ring 8 can ensure that water does not enter the gear cavity 151, playing a crucial protective role.

[0043] Preferably, the sealing ring 8 is a Y-type sealing ring 8 or an O-type sealing ring 8, and its material is nitrile rubber or fluororubber. The Y-type sealing ring 8 can enhance the sealing effect through the lip self-tightening effect under high pressure or high speed rotation conditions, while the O-type sealing ring 8 has the characteristics of simple structure, convenient installation and low cost. Nitrile rubber has excellent oil resistance and wear resistance, and is suitable for conventional drilling operation environment. Fluororubber has better high temperature resistance and corrosion resistance, and can meet the sealing requirements of high temperature conditions or harsh operating environment.

[0044] like Figure 1 and Figure 5As shown, the seal 3 includes a body portion and a skirt portion 33 connected to each other. The body portion is connected to one axial end of the sealing portion 32. The skirt portion 33 is arranged around the sealing portion 32 and the connecting end 21, and the skirt portion 33 abuts against the outer peripheral wall of the connecting end 21. This arrangement, that is, the abutting fit between the skirt portion 33 and the outer peripheral wall of the connecting end 21, and the abutting fit between the sealing portion 32 and the inner wall of the liquid outlet channel 23, together constitute a multi-level sealing barrier. The two work together, so even if one seal wears or ages due to long-term use, the other seal can still maintain effective sealing performance, thereby significantly improving the reliability and service life of the seal 3 under high-speed rotation conditions.

[0045] Furthermore, the skirt 33 is integrally formed with the body and the sealing part 32, resulting in a compact structure that eliminates the need for additional sealing elements, simplifying the assembly process. Moreover, the skirt 33 and the outer peripheral wall of the connecting end 21 abut against each other using a surface contact or line contact method, which reduces the contact area with the drill bit 2 while ensuring the sealing effect, thereby reducing rotational friction loss and improving the transmission efficiency of the drill bit 2 and the overall energy efficiency of the machine.

[0046] Preferably, the seal 3 is made of an elastic material (such as nitrile rubber or fluororubber), which can undergo elastic deformation during the assembly of the drill bit 2. This facilitates installation and allows the seal to maintain a tight fit with the drill bit 2 when it rotates, thus achieving dynamic adaptive sealing. This not only ensures sealing performance but also further reduces the requirements for the rotational accuracy of the drill bit 2 and reduces the difficulty of processing and assembly.

[0047] Specifically, the connecting channel 34 is provided to pass through the main body 31 and the sealing part 32 along the axial direction of the seal 3.

[0048] Furthermore, in this embodiment, an annular protrusion 321 is provided on the outer peripheral wall of the sealing part 32, and the annular protrusion 321 abuts against the inner wall of the liquid outlet channel 23. By setting the annular protrusion 321, the contact form between the sealing part 32 and the inner wall of the liquid outlet channel 23 is optimized from surface contact to line contact or narrow band contact. Under the premise of ensuring the sealing effect, the contact area between the sealing part 32 and the drill bit 2 is significantly reduced, thereby reducing the frictional resistance and frictional heat when the drill bit 2 rotates at high speed, reducing the wear rate of the seal 3, and improving the transmission efficiency of the drill bit 2 and the overall energy efficiency of the machine.

[0049] Furthermore, the line contact between the annular protrusion 321 and the inner wall of the liquid outlet channel 23 allows for localized elastic deformation during the rotation of the drill bit 2, resulting in a more uniform distribution of contact pressure. This enhances the adaptability of the seal 3 to radial runout or eccentricity errors of the drill bit 2, reduces the machining accuracy requirements for the coaxiality of the drill bit 2 and the seal 3, thereby lowering manufacturing costs. Preferably, the cross-sectional shape of the annular protrusion 321 can be semi-circular, triangular, or trapezoidal. A semi-circular cross-section helps reduce contact stress concentration, a triangular cross-section provides a higher sealing specific pressure, and a trapezoidal cross-section combines good wear resistance and sealing performance. The choice can be made according to specific working conditions. The material of the annular protrusion 321 and the body of the sealing part 32 can be integrally formed from the same material, or a composite material coating or insert with better wear resistance can be used to further extend the service life of the seal 3.

[0050] Furthermore, along the axial direction of the drill bit 2, multiple annular protrusions 321 are spaced apart on the outer peripheral wall of the sealing part 32, and auxiliary chambers 322 are formed between adjacent annular protrusions 321. Through the arrangement of these multiple annular protrusions 321, multiple sealing rings are formed. Even if one sealing ring wears or fails due to long-term use, the remaining sealing rings can still maintain effective sealing performance, forming a redundant sealing structure, which significantly improves the reliability and service life of the sealing element 3 under high-speed rotation conditions. On the other hand, the auxiliary chambers 322 formed between adjacent annular protrusions 321 play multiple positive roles in the sealing system: the auxiliary chambers 322 can serve as buffer spaces. When a small leak occurs in the first sealing ring, the pressure rapidly decreases after the leak or liquid enters the auxiliary chambers 322, making it difficult to break through subsequent sealing rings, thus forming a stepped sealing effect with progressively reduced pressure.

[0051] Furthermore, since the seal 3 is made entirely of elastic material, when the drill bit 2 rotates, the airflow generated by the drive blade structure 4 flows along the air inlet channel 13 and acts on the surface of the annular protrusion 321. The airflow pressure compresses the annular protrusion 321, causing it to undergo elastic deformation, thereby forming a micro-gap between the annular protrusion 321 and the inner wall of the liquid outlet channel 23. Gas enters the auxiliary chamber 322 between adjacent annular protrusions 321 through this gap. The gas entering the auxiliary chamber 322 increases the gas pressure inside the chamber. When the gas pressure inside the auxiliary chamber 322 is greater than or equal to the liquid pressure at the connection point between the connecting channel 34 and the liquid outlet channel 23, the gas pressure and liquid pressure reach equilibrium or form a positive pressure difference, thereby effectively preventing liquid leakage outward along the sealing contact surface and achieving a pneumatic assisted sealing effect. Meanwhile, as gas enters the auxiliary chamber 322 through the gap between the annular protrusion 321 and the inner wall of the outlet channel 23, an extremely thin gas film is formed between the contact surfaces of the annular protrusion 321 and the outlet channel 23. This gas film transforms the original solid-solid contact into a non-contact or semi-contact state of gas film lubrication, significantly reducing the coefficient of friction and contact stress between the annular protrusion 321 and the inner wall of the outlet channel 23. This effectively reduces the frictional wear of the seal 3 and greatly extends its service life. Furthermore, this gas film can generate a hydrodynamic pressure effect when the drill bit 2 rotates at high speed, maintaining a slight non-contact state between the annular protrusion 321 and the inner wall of the outlet channel 23, further reducing frictional heat and energy loss, and improving the transmission efficiency of the drill bit 2.

[0052] like Figure 1 , Figure 3 and Figure 4 As shown, the other axial end of the drill bit 2 is the output end 22. The drill bit 2 also includes several auxiliary blades 24 disposed on the inner wall of the liquid outlet channel 23. The auxiliary blades 24 are configured to rotate synchronously with the drill bit 2, generating a force that drives the fluid in the liquid outlet channel 23 to flow toward the output end 22.

[0053] The auxiliary blades 24 achieve multiple beneficial effects: First, when the auxiliary blades 24 rotate synchronously with the drill bit 2, they generate centrifugal force and axial thrust on the liquid in the outlet channel 23, giving the liquid kinetic energy to flow towards the output end 22. This effectively increases the flow pressure and velocity of the liquid in the outlet channel 23, ensuring that the coolant or flushing fluid can be smoothly delivered to the working area of ​​the drill bit 2's output end 22 during drilling operations, achieving sufficient cooling and chip removal, and improving drilling efficiency and quality. Second, the liquid thrust generated by the auxiliary blades 24 forms a directional flow in the outlet channel 23, causing the liquid pressure to be distributed in a gradient along the outlet channel 23, forming a relatively low-pressure area near the connection end 21 and a relatively high-pressure area near the output end 22. This pressure distribution is conducive to the unidirectional flow of liquid towards the output end 22 and prevents reverse backflow of liquid. Third, when the drive blade structure 4 rotates, the gas pressure generated (i.e., the gas pressure produced by the drive blade structure 4) When the gas pressure is less than the liquid pressure in the inlet channel 12, the additional pressure generated by the auxiliary blade 24 can compensate for the insufficient gas pressure, so that the overall liquid pressure in the outlet channel 23 can maintain the pressure difference required for positive flow. This drives the liquid to flow smoothly out through the outlet located at the output end 22, instead of flowing back into the air inlet channel 13, thus avoiding liquid backflow into the air inlet channel 13 or other chambers and causing impact or damage to the sealing structure. In addition, the auxiliary blade 24 and the drive blade structure 4 are respectively set at different axial positions of the drill bit 2. The two work together. The drive blade structure 4 is responsible for generating positive gas pressure to form a gas film seal and assist in air intake, while the auxiliary blade 24 is responsible for enhancing the liquid flow dynamics and maintaining unidirectional liquid flow, forming a pressure balance and flow coordination mechanism between the gas side and the liquid side. This enables the whole machine to achieve reliable dynamic sealing and efficient liquid flow transportation at the same time during drilling operations, significantly improving the overall performance and reliability of the diamond drilling machine.

[0054] like Figure 1 Figure 4 and Figure 6 As shown, the drive blade structure 4 in this embodiment includes a collar portion 41 and several blade portions 42 connected to the outer circumferential surface of the collar. The collar portion 41 is sleeved on the outside of the drill bit 2 and is interference-fitted with the drill bit 2. This arrangement ensures a stable connection between the drive blade structure 4 and the drill bit 2, allowing the drive blade structure 4 to rotate synchronously with the drill bit 2. When the drill bit 2 drives the drive blade structure 4 to rotate, the blade portions 42 rotate accordingly and act on the surrounding air, generating a driving force that drives the airflow, thereby allowing external gas to flow into the intake channel 13 from the intake port 11.

[0055] It is understood that the drive blade structure 4 used in this embodiment achieves a fixed connection between the collar portion 41 and the drill bit 2 through an interference fit. This ensures reliable connection and efficient transmission without the need for additional fasteners, while simultaneously allowing the drive blade structure 4 to rotate synchronously with the drill bit 2, achieving mechanical linkage between airflow generation and drilling operations. When the drill bit 2 starts, the drive blade structure 4 immediately rotates and generates airflow; when the drill bit 2 stops or changes speed, the airflow rate changes synchronously without the need for additional sensors, controllers, or actuators. This purely mechanical synchronous control method features zero-delay response and zero-lag control, achieving an adaptive effect where the airflow adapts to the drill bit 2's rotational speed. Furthermore, the drive blade structure 4 can be manufactured as a single piece using injection molding or powder metallurgy processes, resulting in a simple structure, low manufacturing cost, and strong versatility. It only requires adjusting the inner diameter of the collar portion 41 to adapt to different specifications of drill bits 2, demonstrating good economic efficiency and market competitiveness.

[0056] Preferably, the diamond drilling machine includes an annular pressure booster 5 located downstream of the drive blade structure 4. The pressure booster is sleeved on the outside of the drill bit 2 along the axial direction of the drill bit 2. There is a pressure boosting cavity between the inner wall of the annular pressure booster 5 and the outer wall of the drill bit 2. The air intake channel 13 includes the pressure boosting cavity. Along the flow direction of the gas in the air intake channel 13, the radial distance between the inner wall of the annular pressure booster 5 and the outer wall of the drill bit 2 gradually decreases at least partially.

[0057] With the above structure, when the airflow generated by the drive blade structure 4 enters the pressurization chamber, the flow cross-sectional area gradually narrows along the airflow direction, the airflow velocity increases and the pressure rises, forming a jet effect similar to a nozzle, thereby significantly improving the jet speed and impact force of the airflow, so that the high-speed airflow can more effectively enter the gap formed between the sealing part 32 and the inner wall of the drill bit 2.

[0058] The annular pressure booster 5 can be fixedly connected to the housing 1 or the drill bit 2, thereby achieving stable installation of the annular pressure booster 5. That is, depending on the connection method, it can rotate synchronously with the drill bit 2 or it can not rotate synchronously with the drill bit 2.

[0059] Preferably, the inner wall of the annular booster 5 is provided with a plurality of guide vanes 51 spaced apart along its circumference. Along its radial direction, the guide vanes 51 can be connected to or tightly abutted against the outer circumference of the drill bit 2, thereby achieving a stable connection (i.e., interference fit) between the annular booster 5 and the drill bit 2. That is, it can rotate synchronously with the drill bit 2. The centrifugal force of the guide vanes 51 can help the airflow to be evenly distributed along the booster cavity, avoiding airflow deviation or vortex loss, and further improving boosting efficiency and airflow stability.

[0060] In addition, the annular pressurizing component 5 and the drive blade structure 4 are arranged sequentially along the axial direction. The two work together to generate the basic airflow first by the drive blade structure 4, and then the pressurizing component accelerates and pressurizes the airflow, forming a two-stage airflow power enhancement mechanism. Without increasing the speed or size of the drive blade structure 4, the working efficiency of the airflow is effectively improved, while reducing the overall energy consumption and noise level of the machine.

[0061] Furthermore, a first bearing 19 is fitted inside the mounting cavity 16 and sleeved around the drill bit 2. The drill bit 2 is rotatably connected to the housing 1 via the first bearing 19. Along the axial direction of the drill bit 2, a sealing ring 8 is sealed between the air inlet 11 and the mounting cavity 16 and the first bearing 19. This arrangement serves two purposes: firstly, the sealing ring 8 effectively prevents gas carrying dust or moisture from entering the area of ​​the first bearing 19, preventing contamination or erosion of the bearing grease and extending the bearing's service life; secondly, the bearing's proximity to the sealing ring 8 provides stable support for the drill bit 2, reducing radial runout during rotation and thus reducing dynamic wear between the sealing ring 8 and the drill bit 2, improving sealing reliability. Of course, other bearings can also be installed inside the housing 1, which also contribute to improving the stability of the rotatable connection between the drill bit 2 and the housing 1.

[0062] like Figure 1 and Figure 2 As shown, the housing 1 also includes a liquid inlet valve 17 located on the liquid inlet channel 12. The diamond drilling machine connects to an external liquid source through the liquid inlet valve 17. By setting the liquid inlet valve 17, the user can flexibly control the liquid supply according to the drilling operation requirements, avoiding resource waste. At the same time, the liquid inlet valve 17 supports quick connection with various external liquid sources, improving the equipment's versatility and ease of use, and facilitating transportation and storage, ensuring the safety and reliability of the entire machine. In particular, the liquid inlet valve 17 can be a solenoid valve that works synchronously with the motor; that is, the solenoid valve opens when the motor starts and closes when the motor stops.

[0063] As shown in Figure 1, a filter screen 18 is provided at the air inlet 11 in this embodiment. By setting the filter screen 18 at the air inlet 11, dust, particulate matter and impurities in the outside air can be effectively blocked from entering the air intake channel 13, preventing impurities from adhering to the surface of the drive blade structure 4 and affecting its dynamic balance, or from entering the sealing gap with the airflow and causing wear to the seal 3 and drill bit 2. At the same time, the filter screen 18 can prevent large particles of debris from clogging the air intake channel 13 or the auxiliary chamber 322, ensuring smooth airflow.

[0064] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0065] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A diamond drilling machine, characterized in that, include: The housing (1) includes a gearbox (15) having a gear cavity (151), and the housing (1) has an inlet channel (12) communicating with the gear cavity (151). The drill bit (2) has a connecting end (21) at one axial end, which is located in the gear cavity (151) of the housing (1). The drill bit (2) includes a liquid outlet channel (23) extending from the connecting end (21) to the other axial end. A sealing element (3) is installed in the gear cavity (151). The sealing element (3) includes a sealing part (32). The sealing part (32) is inserted into the liquid outlet channel (23) from the side of the connecting end (21) and abuts against the inner wall of the liquid outlet channel (23). The sealing element (3) has a through connecting channel (34) that connects the liquid inlet channel (12) and the liquid outlet channel (23). A drive blade structure (4) is disposed outside the drill bit (2) and fixedly connected to the drill bit (2); An air intake passage (13) is located inside the gearbox (15), and the drive blade structure (4) is housed within the air intake passage (13); The drive blade structure (4) can rotate with the drill bit (2) to generate airflow, which is used to prevent the liquid in the liquid outlet channel (23) from entering the gear cavity (151) of the gearbox (15).

2. A diamond drilling machine, characterized in that, include: The housing (1) has a liquid inlet channel (12) inside. The drill bit (2) has a connecting end (21) at one axial end, which is located inside the housing (1). The drill bit (2) includes a liquid outlet channel (23) extending from the connecting end (21) to the other axial end. A sealing element (3) is installed inside the housing (1). The sealing element (3) includes a sealing part (32). The sealing part (32) is inserted into the liquid outlet channel (23) from the side of the connecting end (21) and abuts against the inner wall of the liquid outlet channel (23). The sealing element (3) has a through connecting channel (34) that connects the liquid inlet channel (12) and the liquid outlet channel (23). A drive blade structure (4) is disposed outside the drill bit (2) and fixedly connected to the drill bit (2); An air intake channel (13) is located inside the housing (1), and the drive blade structure (4) is housed within the air intake channel (13); The diamond drilling machine is in a working state. In the working state, the drive blade structure (4) rotates synchronously with the drill bit (2). When a gap appears between the sealing part (32) and the inner wall of the liquid outlet channel (23), the drive blade structure (4) can drive the gas in the air inlet channel (13) into the gap.

3. The diamond drilling machine according to claim 1 or 2, characterized in that, The housing (1) includes a gearbox (15), and the air intake channel (13) is formed by the inner wall of the gearbox (15), the outer wall of the drill bit (2), and the seal (3); the drive blade structure (4) includes a collar portion (41) and a plurality of blade portions (42) connected to the outer circumferential surface of the collar, and the collar portion (41) is sleeved on the outside of the drill bit (2) and has an interference fit with the drill bit (2).

4. The diamond drilling machine according to claim 1 or 2, characterized in that, The diamond drilling machine includes an annular booster (5) located downstream of the drive blade structure (4). The booster is sleeved on the outside of the drill bit (2) along the axial direction of the drill bit (2). The air intake channel (13) includes a booster chamber, which is formed by the inner wall of the annular booster (5) and the outer wall of the drill bit (2). Along the flow direction of the gas in the air intake channel (13), the radial distance between the inner wall of the annular booster (5) and the outer wall of the drill bit (2) gradually decreases at least partially.

5. The diamond drilling machine according to claim 4, characterized in that, At least one guide vane (51) is provided on the inner wall of the annular booster (5) along its circumference. The annular pressure booster (5) is fixedly connected to the housing (1) or the drill bit (2).

6. The diamond drilling machine according to claim 1 or 2, characterized in that, The inner wall of the housing (1) has a mounting cavity (16), and the sealing element (3) and the connecting end (21) are both housed in the mounting cavity (16); Along the axial direction of the drill bit (2), the mounting cavity (16) is connected to the liquid inlet channel (12), and the seal (3) is located between the connection point of the mounting cavity (16) and the liquid inlet channel (12) and the connecting end (21); The liquid inlet channel (12) is connected to the connecting channel (34) through the mounting cavity (16).

7. The diamond drilling machine according to claim 6, characterized in that, The housing (1) has a gear cavity (151) for accommodating the gear assembly (9). The diamond drilling machine includes a drive motor (6). The output shaft (61) of the drive motor (6) is connected to the drill bit (2) via the gear assembly (9). The housing (1) is provided with an air inlet (11) that communicates with the air inlet channel (13). The air inlet (11) communicates with the mounting cavity (16). The air inlet (11) is located on the side of the drive blade structure (4) away from the liquid inlet channel (12). Along the axial direction of the drill bit (2), a sealing ring (8) is provided between the mounting cavity (16) and the drill bit (2). The sealing ring (8) is sleeved on the outside of the drill bit (2). The sealing ring (8) is located on the side of the drive blade structure (4) away from the liquid inlet channel (12). The drive blade structure (4) is located on the side of the air inlet (11) close to the liquid inlet channel (12), and the sealing ring (8) is located on the side of the air inlet (11) away from the liquid inlet channel (12).

8. The diamond drilling machine according to claim 7, characterized in that, The mounting cavity (16) is provided with a first bearing (19) sleeved on the outside of the drill bit (2). The drill bit (2) is rotatably connected to the housing (1) through the first bearing (19). Along the axial direction of the drill bit (2), the sealing ring (8) is sealed between the air inlet (11) and the first bearing (19).

9. The diamond drilling machine according to claim 1 or 2, characterized in that, The drill bit (2) has an output end (22) at the other axial end. The drill bit (2) also includes a plurality of auxiliary blades (24) disposed on the inner wall of the liquid outlet channel (23). The auxiliary blades (24) are configured to rotate synchronously with the drill bit (2); and / or, The outer peripheral wall of the sealing part (32) is provided with an annular protrusion (321), and the annular protrusion (321) abuts against the inner wall of the liquid outlet channel (23); The annular protrusions (321) are spaced apart along the axial direction of the drill bit (2). The annular protrusions (321) are located on the outer peripheral wall of the sealing part (32), and an auxiliary chamber (322) is formed between adjacent annular protrusions (321).

10. The diamond drilling machine according to claim 1 or 2, characterized in that, The inner wall of the housing (1) has a mounting cavity (16), and the sealing element (3) and the connecting end (21) are both housed in the mounting cavity (16). The sealing element (3) is interference-fitted with the mounting cavity (16). The sealing element (3) includes a connected body portion and a skirt portion (33). The body portion is connected to one axial end of the sealing portion (32). The skirt portion (33) is arranged around the sealing portion (32) and the connecting end (21), and the skirt portion (33) abuts against the outer peripheral wall of the connecting end (21). A stepped structure is formed at the connection between the body portion and the skirt portion (33), and the two adjacent surfaces of the stepped structure abut against the inner wall of the mounting cavity (16); and / or, The housing (1) further includes an inlet valve (17) disposed on the inlet channel (12); and / or, The housing (1) is provided with an air inlet (11), and a filter screen (18) is provided at the air inlet (11); and / or, The pressure of the gas discharged from the drive blade structure (4) is greater than or equal to the liquid pressure at the outlet of the liquid outlet channel (23) located at the outlet of the connecting channel (34).

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